blob: f7cfc703bd213a9ee5cdf9fd90473e0def8f24b8 [file] [log] [blame]
Thomas Gleixner2874c5f2019-05-27 08:55:01 +02001// SPDX-License-Identifier: GPL-2.0-or-later
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
3 * NET An implementation of the SOCKET network access protocol.
4 *
5 * Version: @(#)socket.c 1.1.93 18/02/95
6 *
7 * Authors: Orest Zborowski, <obz@Kodak.COM>
Jesper Juhl02c30a82005-05-05 16:16:16 -07008 * Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 *
11 * Fixes:
12 * Anonymous : NOTSOCK/BADF cleanup. Error fix in
13 * shutdown()
14 * Alan Cox : verify_area() fixes
15 * Alan Cox : Removed DDI
16 * Jonathan Kamens : SOCK_DGRAM reconnect bug
17 * Alan Cox : Moved a load of checks to the very
18 * top level.
19 * Alan Cox : Move address structures to/from user
20 * mode above the protocol layers.
21 * Rob Janssen : Allow 0 length sends.
22 * Alan Cox : Asynchronous I/O support (cribbed from the
23 * tty drivers).
24 * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style)
25 * Jeff Uphoff : Made max number of sockets command-line
26 * configurable.
27 * Matti Aarnio : Made the number of sockets dynamic,
28 * to be allocated when needed, and mr.
29 * Uphoff's max is used as max to be
30 * allowed to allocate.
31 * Linus : Argh. removed all the socket allocation
32 * altogether: it's in the inode now.
33 * Alan Cox : Made sock_alloc()/sock_release() public
34 * for NetROM and future kernel nfsd type
35 * stuff.
36 * Alan Cox : sendmsg/recvmsg basics.
37 * Tom Dyas : Export net symbols.
38 * Marcin Dalecki : Fixed problems with CONFIG_NET="n".
39 * Alan Cox : Added thread locking to sys_* calls
40 * for sockets. May have errors at the
41 * moment.
42 * Kevin Buhr : Fixed the dumb errors in the above.
43 * Andi Kleen : Some small cleanups, optimizations,
44 * and fixed a copy_from_user() bug.
45 * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0)
Stephen Hemminger89bddce2006-09-01 00:19:31 -070046 * Tigran Aivazian : Made listen(2) backlog sanity checks
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 * protocol-independent
48 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 * This module is effectively the top level interface to the BSD socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -070050 * paradigm.
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 *
52 * Based upon Swansea University Computer Society NET3.039
53 */
54
Jakub Kicinskicc698372020-11-20 14:50:52 -080055#include <linux/ethtool.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070057#include <linux/socket.h>
58#include <linux/file.h>
59#include <linux/net.h>
60#include <linux/interrupt.h>
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -070061#include <linux/thread_info.h>
Stephen Hemminger55737fd2006-09-01 00:23:39 -070062#include <linux/rcupdate.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070063#include <linux/netdevice.h>
64#include <linux/proc_fs.h>
65#include <linux/seq_file.h>
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080066#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#include <linux/if_bridge.h>
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -030068#include <linux/if_vlan.h>
Daniel Borkmann408eccc2014-04-01 16:20:23 +020069#include <linux/ptp_classify.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070070#include <linux/init.h>
71#include <linux/poll.h>
72#include <linux/cache.h>
73#include <linux/module.h>
74#include <linux/highmem.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070075#include <linux/mount.h>
David Howellsfba9be42019-03-25 16:38:24 +000076#include <linux/pseudo_fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070077#include <linux/security.h>
78#include <linux/syscalls.h>
79#include <linux/compat.h>
80#include <linux/kmod.h>
David Woodhouse3ec3b2f2005-05-17 12:08:48 +010081#include <linux/audit.h>
Adrian Bunkd86b5e02006-01-21 00:46:55 +010082#include <linux/wireless.h>
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -070083#include <linux/nsproxy.h>
Nick Black1fd7317d2009-09-22 16:43:33 -070084#include <linux/magic.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090085#include <linux/slab.h>
Masatake YAMATO600e1772012-08-29 10:44:29 +000086#include <linux/xattr.h>
Jeremy Clinec8e8cd52018-07-27 22:43:01 +000087#include <linux/nospec.h>
Paolo Abeni8c3c4472019-05-03 17:01:39 +020088#include <linux/indirect_call_wrapper.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Linus Torvalds7c0f6ba2016-12-24 11:46:01 -080090#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070091#include <asm/unistd.h>
92
93#include <net/compat.h>
David S. Miller87de87d2008-06-03 09:14:03 -070094#include <net/wext.h>
Herbert Xuf8451722010-05-24 00:12:34 -070095#include <net/cls_cgroup.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
97#include <net/sock.h>
98#include <linux/netfilter.h>
99
Arnd Bergmann6b960182009-11-06 23:10:54 -0800100#include <linux/if_tun.h>
101#include <linux/ipv6_route.h>
102#include <linux/route.h>
Arnd Bergmannc7dc5042019-06-03 23:07:12 +0200103#include <linux/termios.h>
Arnd Bergmann6b960182009-11-06 23:10:54 -0800104#include <linux/sockios.h>
Eliezer Tamir076bb0c2013-07-10 17:13:17 +0300105#include <net/busy_poll.h>
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400106#include <linux/errqueue.h>
Yangbo Lud7c08822021-06-30 16:12:00 +0800107#include <linux/ptp_clock_kernel.h>
Eliezer Tamir06021292013-06-10 11:39:50 +0300108
Cong Wange0d10952013-08-01 11:10:25 +0800109#ifdef CONFIG_NET_RX_BUSY_POLL
Eliezer Tamir64b0dc52013-07-10 17:13:36 +0300110unsigned int sysctl_net_busy_read __read_mostly;
111unsigned int sysctl_net_busy_poll __read_mostly;
Eliezer Tamir06021292013-06-10 11:39:50 +0300112#endif
Arnd Bergmann6b960182009-11-06 23:10:54 -0800113
Al Viro8ae5e0302014-11-28 19:40:50 -0500114static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to);
115static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700116static int sock_mmap(struct file *file, struct vm_area_struct *vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117
118static int sock_close(struct inode *inode, struct file *file);
Linus Torvaldsa11e1d42018-06-28 09:43:44 -0700119static __poll_t sock_poll(struct file *file,
120 struct poll_table_struct *wait);
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700121static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800122#ifdef CONFIG_COMPAT
123static long compat_sock_ioctl(struct file *file,
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700124 unsigned int cmd, unsigned long arg);
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800125#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126static int sock_fasync(int fd, struct file *filp, int on);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127static ssize_t sock_sendpage(struct file *file, struct page *page,
128 int offset, size_t size, loff_t *ppos, int more);
Jens Axboe9c55e012007-11-06 23:30:13 -0800129static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700130 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -0800131 unsigned int flags);
Arnd Bergmann542d3062020-01-08 22:44:43 +0100132
133#ifdef CONFIG_PROC_FS
134static void sock_show_fdinfo(struct seq_file *m, struct file *f)
135{
136 struct socket *sock = f->private_data;
137
138 if (sock->ops->show_fdinfo)
139 sock->ops->show_fdinfo(m, sock);
140}
141#else
142#define sock_show_fdinfo NULL
143#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145/*
146 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
147 * in the operation structures but are done directly via the socketcall() multiplexor.
148 */
149
Arjan van de Venda7071d2007-02-12 00:55:36 -0800150static const struct file_operations socket_file_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 .owner = THIS_MODULE,
152 .llseek = no_llseek,
Al Viro8ae5e0302014-11-28 19:40:50 -0500153 .read_iter = sock_read_iter,
154 .write_iter = sock_write_iter,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 .poll = sock_poll,
156 .unlocked_ioctl = sock_ioctl,
Shaun Pereira89bbfc92006-03-21 23:58:08 -0800157#ifdef CONFIG_COMPAT
158 .compat_ioctl = compat_sock_ioctl,
159#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 .mmap = sock_mmap,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 .release = sock_close,
162 .fasync = sock_fasync,
Jens Axboe5274f052006-03-30 15:15:30 +0200163 .sendpage = sock_sendpage,
164 .splice_write = generic_splice_sendpage,
Jens Axboe9c55e012007-11-06 23:30:13 -0800165 .splice_read = sock_splice_read,
Kirill Tkhaib4653342019-12-09 13:03:40 +0300166 .show_fdinfo = sock_show_fdinfo,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167};
168
Yejune Dengfe0bdbd2021-06-21 13:12:25 +0800169static const char * const pf_family_names[] = {
170 [PF_UNSPEC] = "PF_UNSPEC",
171 [PF_UNIX] = "PF_UNIX/PF_LOCAL",
172 [PF_INET] = "PF_INET",
173 [PF_AX25] = "PF_AX25",
174 [PF_IPX] = "PF_IPX",
175 [PF_APPLETALK] = "PF_APPLETALK",
176 [PF_NETROM] = "PF_NETROM",
177 [PF_BRIDGE] = "PF_BRIDGE",
178 [PF_ATMPVC] = "PF_ATMPVC",
179 [PF_X25] = "PF_X25",
180 [PF_INET6] = "PF_INET6",
181 [PF_ROSE] = "PF_ROSE",
182 [PF_DECnet] = "PF_DECnet",
183 [PF_NETBEUI] = "PF_NETBEUI",
184 [PF_SECURITY] = "PF_SECURITY",
185 [PF_KEY] = "PF_KEY",
186 [PF_NETLINK] = "PF_NETLINK/PF_ROUTE",
187 [PF_PACKET] = "PF_PACKET",
188 [PF_ASH] = "PF_ASH",
189 [PF_ECONET] = "PF_ECONET",
190 [PF_ATMSVC] = "PF_ATMSVC",
191 [PF_RDS] = "PF_RDS",
192 [PF_SNA] = "PF_SNA",
193 [PF_IRDA] = "PF_IRDA",
194 [PF_PPPOX] = "PF_PPPOX",
195 [PF_WANPIPE] = "PF_WANPIPE",
196 [PF_LLC] = "PF_LLC",
197 [PF_IB] = "PF_IB",
198 [PF_MPLS] = "PF_MPLS",
199 [PF_CAN] = "PF_CAN",
200 [PF_TIPC] = "PF_TIPC",
201 [PF_BLUETOOTH] = "PF_BLUETOOTH",
202 [PF_IUCV] = "PF_IUCV",
203 [PF_RXRPC] = "PF_RXRPC",
204 [PF_ISDN] = "PF_ISDN",
205 [PF_PHONET] = "PF_PHONET",
206 [PF_IEEE802154] = "PF_IEEE802154",
207 [PF_CAIF] = "PF_CAIF",
208 [PF_ALG] = "PF_ALG",
209 [PF_NFC] = "PF_NFC",
210 [PF_VSOCK] = "PF_VSOCK",
211 [PF_KCM] = "PF_KCM",
212 [PF_QIPCRTR] = "PF_QIPCRTR",
213 [PF_SMC] = "PF_SMC",
214 [PF_XDP] = "PF_XDP",
Jeremy Kerrbc49d812021-07-29 10:20:39 +0800215 [PF_MCTP] = "PF_MCTP",
Yejune Dengfe0bdbd2021-06-21 13:12:25 +0800216};
217
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218/*
219 * The protocol list. Each protocol is registered in here.
220 */
221
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222static DEFINE_SPINLOCK(net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +0000223static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700226 * Support routines.
227 * Move socket addresses back and forth across the kernel/user
228 * divide and look after the messy bits.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 */
230
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231/**
232 * move_addr_to_kernel - copy a socket address into kernel space
233 * @uaddr: Address in user space
234 * @kaddr: Address in kernel space
235 * @ulen: Length in user space
236 *
237 * The address is copied into kernel space. If the provided address is
238 * too long an error code of -EINVAL is returned. If the copy gives
239 * invalid addresses -EFAULT is returned. On a success 0 is returned.
240 */
241
Maciej Żenczykowski43db3622012-03-11 12:51:50 +0000242int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243{
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -0700244 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700246 if (ulen == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 return 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700248 if (copy_from_user(kaddr, uaddr, ulen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +0100250 return audit_sockaddr(ulen, kaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251}
252
253/**
254 * move_addr_to_user - copy an address to user space
255 * @kaddr: kernel space address
256 * @klen: length of address in kernel
257 * @uaddr: user space address
258 * @ulen: pointer to user length field
259 *
260 * The value pointed to by ulen on entry is the buffer length available.
261 * This is overwritten with the buffer space used. -EINVAL is returned
262 * if an overlong buffer is specified or a negative buffer size. -EFAULT
263 * is returned if either the buffer or the length field are not
264 * accessible.
265 * After copying the data up to the limit the user specifies, the true
266 * length of the data is written over the length limit the user
267 * specified. Zero is returned for a success.
268 */
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700269
Maciej Żenczykowski43db3622012-03-11 12:51:50 +0000270static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
stephen hemminger11165f12010-10-18 14:27:29 +0000271 void __user *uaddr, int __user *ulen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272{
273 int err;
274 int len;
275
Hannes Frederic Sowa68c6beb2013-11-21 03:14:34 +0100276 BUG_ON(klen > sizeof(struct sockaddr_storage));
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700277 err = get_user(len, ulen);
278 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700280 if (len > klen)
281 len = klen;
Hannes Frederic Sowa68c6beb2013-11-21 03:14:34 +0100282 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700284 if (len) {
Steve Grubbd6fe3942006-03-30 12:20:22 -0500285 if (audit_sockaddr(klen, kaddr))
286 return -ENOMEM;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700287 if (copy_to_user(uaddr, kaddr, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 return -EFAULT;
289 }
290 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700291 * "fromlen shall refer to the value before truncation.."
292 * 1003.1g
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 */
294 return __put_user(klen, ulen);
295}
296
Alexey Dobriyan08009a72018-02-24 21:20:33 +0300297static struct kmem_cache *sock_inode_cachep __ro_after_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
299static struct inode *sock_alloc_inode(struct super_block *sb)
300{
301 struct socket_alloc *ei;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700302
Christoph Lametere94b1762006-12-06 20:33:17 -0800303 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 if (!ei)
305 return NULL;
Al Viro333f7902019-07-05 20:14:16 +0100306 init_waitqueue_head(&ei->socket.wq.wait);
307 ei->socket.wq.fasync_list = NULL;
308 ei->socket.wq.flags = 0;
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700309
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 ei->socket.state = SS_UNCONNECTED;
311 ei->socket.flags = 0;
312 ei->socket.ops = NULL;
313 ei->socket.sk = NULL;
314 ei->socket.file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
316 return &ei->vfs_inode;
317}
318
Al Viro6d7855c2019-07-05 20:13:22 +0100319static void sock_free_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320{
Eric Dumazet43815482010-04-29 11:01:49 +0000321 struct socket_alloc *ei;
322
323 ei = container_of(inode, struct socket_alloc, vfs_inode);
Eric Dumazet43815482010-04-29 11:01:49 +0000324 kmem_cache_free(sock_inode_cachep, ei);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325}
326
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700327static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700329 struct socket_alloc *ei = (struct socket_alloc *)foo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
Christoph Lametera35afb82007-05-16 22:10:57 -0700331 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332}
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700333
yuan linyu1e911632017-01-07 17:18:31 +0800334static void init_inodecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335{
336 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700337 sizeof(struct socket_alloc),
338 0,
339 (SLAB_HWCACHE_ALIGN |
340 SLAB_RECLAIM_ACCOUNT |
Vladimir Davydov5d097052016-01-14 15:18:21 -0800341 SLAB_MEM_SPREAD | SLAB_ACCOUNT),
Paul Mundt20c2df82007-07-20 10:11:58 +0900342 init_once);
yuan linyu1e911632017-01-07 17:18:31 +0800343 BUG_ON(sock_inode_cachep == NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344}
345
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700346static const struct super_operations sockfs_ops = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700347 .alloc_inode = sock_alloc_inode,
Al Viro6d7855c2019-07-05 20:13:22 +0100348 .free_inode = sock_free_inode,
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700349 .statfs = simple_statfs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350};
351
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700352/*
353 * sockfs_dname() is called from d_path().
354 */
355static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
356{
357 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
David Howellsc5ef6032015-03-17 22:26:16 +0000358 d_inode(dentry)->i_ino);
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700359}
360
Al Viro3ba13d12009-02-20 06:02:22 +0000361static const struct dentry_operations sockfs_dentry_operations = {
Eric Dumazetc23fbb62007-05-08 00:26:18 -0700362 .d_dname = sockfs_dname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363};
364
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200365static int sockfs_xattr_get(const struct xattr_handler *handler,
366 struct dentry *dentry, struct inode *inode,
367 const char *suffix, void *value, size_t size)
368{
369 if (value) {
370 if (dentry->d_name.len + 1 > size)
371 return -ERANGE;
372 memcpy(value, dentry->d_name.name, dentry->d_name.len + 1);
373 }
374 return dentry->d_name.len + 1;
375}
376
377#define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
378#define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
379#define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
380
381static const struct xattr_handler sockfs_xattr_handler = {
382 .name = XATTR_NAME_SOCKPROTONAME,
383 .get = sockfs_xattr_get,
384};
385
Andreas Gruenbacher4a590152016-11-13 21:23:34 +0100386static int sockfs_security_xattr_set(const struct xattr_handler *handler,
Christian Braunere65ce2a2021-01-21 14:19:27 +0100387 struct user_namespace *mnt_userns,
Andreas Gruenbacher4a590152016-11-13 21:23:34 +0100388 struct dentry *dentry, struct inode *inode,
389 const char *suffix, const void *value,
390 size_t size, int flags)
391{
392 /* Handled by LSM. */
393 return -EAGAIN;
394}
395
396static const struct xattr_handler sockfs_security_xattr_handler = {
397 .prefix = XATTR_SECURITY_PREFIX,
398 .set = sockfs_security_xattr_set,
399};
400
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200401static const struct xattr_handler *sockfs_xattr_handlers[] = {
402 &sockfs_xattr_handler,
Andreas Gruenbacher4a590152016-11-13 21:23:34 +0100403 &sockfs_security_xattr_handler,
Andreas Gruenbacherbba0bd32016-09-29 17:48:35 +0200404 NULL
405};
406
David Howellsfba9be42019-03-25 16:38:24 +0000407static int sockfs_init_fs_context(struct fs_context *fc)
Al Viroc74a1cb2011-01-12 16:59:34 -0500408{
David Howellsfba9be42019-03-25 16:38:24 +0000409 struct pseudo_fs_context *ctx = init_pseudo(fc, SOCKFS_MAGIC);
410 if (!ctx)
411 return -ENOMEM;
412 ctx->ops = &sockfs_ops;
413 ctx->dops = &sockfs_dentry_operations;
414 ctx->xattr = sockfs_xattr_handlers;
415 return 0;
Al Viroc74a1cb2011-01-12 16:59:34 -0500416}
417
418static struct vfsmount *sock_mnt __read_mostly;
419
420static struct file_system_type sock_fs_type = {
421 .name = "sockfs",
David Howellsfba9be42019-03-25 16:38:24 +0000422 .init_fs_context = sockfs_init_fs_context,
Al Viroc74a1cb2011-01-12 16:59:34 -0500423 .kill_sb = kill_anon_super,
424};
425
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426/*
427 * Obtains the first available file descriptor and sets it up for use.
428 *
David S. Miller39d8c1b2006-03-20 17:13:49 -0800429 * These functions create file structures and maps them to fd space
430 * of the current process. On success it returns file descriptor
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 * and file struct implicitly stored in sock->file.
432 * Note that another thread may close file descriptor before we return
433 * from this function. We use the fact that now we do not refer
434 * to socket after mapping. If one day we will need it, this
435 * function will increment ref. count on file by 1.
436 *
437 * In any case returned fd MAY BE not valid!
438 * This race condition is unavoidable
439 * with shared fd spaces, we cannot solve it inside kernel,
440 * but we take care of internal coherence yet.
441 */
442
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300443/**
444 * sock_alloc_file - Bind a &socket to a &file
445 * @sock: socket
446 * @flags: file status flags
447 * @dname: protocol name
448 *
449 * Returns the &file bound with @sock, implicitly storing it
450 * in sock->file. If dname is %NULL, sets to "".
451 * On failure the return is a ERR pointer (see linux/err.h).
452 * This function uses GFP_KERNEL internally.
453 */
454
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700455struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456{
Al Viro7cbe66b2009-08-05 19:59:08 +0400457 struct file *file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800458
Al Virod93aa9d2018-06-09 09:40:05 -0400459 if (!dname)
460 dname = sock->sk ? sock->sk->sk_prot_creator->name : "";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461
Al Virod93aa9d2018-06-09 09:40:05 -0400462 file = alloc_file_pseudo(SOCK_INODE(sock), sock_mnt, dname,
463 O_RDWR | (flags & O_NONBLOCK),
464 &socket_file_ops);
Viresh Kumarb5ffe632015-08-12 15:59:47 +0530465 if (IS_ERR(file)) {
Al Viro8e1611e2017-12-05 23:29:09 +0000466 sock_release(sock);
Anatol Pomozov39b65252012-09-12 20:11:55 -0700467 return file;
Al Virocc3808f2009-08-06 09:43:59 +0400468 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800469
470 sock->file = file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800471 file->private_data = sock;
Linus Torvaldsd8e464e2019-11-17 11:20:48 -0800472 stream_open(SOCK_INODE(sock), file);
Al Viro28407632012-08-17 23:54:15 -0400473 return file;
David S. Miller39d8c1b2006-03-20 17:13:49 -0800474}
Al Viro56b31d12012-08-18 00:25:51 -0400475EXPORT_SYMBOL(sock_alloc_file);
David S. Miller39d8c1b2006-03-20 17:13:49 -0800476
Al Viro56b31d12012-08-18 00:25:51 -0400477static int sock_map_fd(struct socket *sock, int flags)
David S. Miller39d8c1b2006-03-20 17:13:49 -0800478{
479 struct file *newfile;
Al Viro28407632012-08-17 23:54:15 -0400480 int fd = get_unused_fd_flags(flags);
Al Viroce4bb042018-01-10 18:47:05 -0500481 if (unlikely(fd < 0)) {
482 sock_release(sock);
Al Viro28407632012-08-17 23:54:15 -0400483 return fd;
Al Viroce4bb042018-01-10 18:47:05 -0500484 }
David S. Miller39d8c1b2006-03-20 17:13:49 -0800485
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700486 newfile = sock_alloc_file(sock, flags, NULL);
Enrico Weigelt4546e442019-06-05 22:58:50 +0200487 if (!IS_ERR(newfile)) {
David S. Miller39d8c1b2006-03-20 17:13:49 -0800488 fd_install(fd, newfile);
Al Viro28407632012-08-17 23:54:15 -0400489 return fd;
490 }
Al Viro7cbe66b2009-08-05 19:59:08 +0400491
Al Viro28407632012-08-17 23:54:15 -0400492 put_unused_fd(fd);
493 return PTR_ERR(newfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494}
495
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300496/**
497 * sock_from_file - Return the &socket bounded to @file.
498 * @file: file
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300499 *
Florent Revestdba4a922020-12-04 12:36:04 +0100500 * On failure returns %NULL.
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300501 */
502
Florent Revestdba4a922020-12-04 12:36:04 +0100503struct socket *sock_from_file(struct file *file)
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800504{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800505 if (file->f_op == &socket_file_ops)
506 return file->private_data; /* set in sock_map_fd */
507
Eric Dumazet23bb80d2007-02-08 14:59:57 -0800508 return NULL;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800509}
John Fastabend406a3c62012-07-20 10:39:25 +0000510EXPORT_SYMBOL(sock_from_file);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800511
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512/**
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700513 * sockfd_lookup - Go from a file number to its socket slot
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 * @fd: file handle
515 * @err: pointer to an error code return
516 *
517 * The file handle passed in is locked and the socket it is bound
Rosen, Rami241c4662017-05-21 22:12:38 +0300518 * to is returned. If an error occurs the err pointer is overwritten
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 * with a negative errno code and NULL is returned. The function checks
520 * for both invalid handles and passing a handle which is not a socket.
521 *
522 * On a success the socket object pointer is returned.
523 */
524
525struct socket *sockfd_lookup(int fd, int *err)
526{
527 struct file *file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 struct socket *sock;
529
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700530 file = fget(fd);
531 if (!file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 *err = -EBADF;
533 return NULL;
534 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700535
Florent Revestdba4a922020-12-04 12:36:04 +0100536 sock = sock_from_file(file);
537 if (!sock) {
538 *err = -ENOTSOCK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 fput(file);
Florent Revestdba4a922020-12-04 12:36:04 +0100540 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 return sock;
542}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700543EXPORT_SYMBOL(sockfd_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800545static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
546{
Al Viro00e188e2014-03-03 23:48:18 -0500547 struct fd f = fdget(fd);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800548 struct socket *sock;
549
Hua Zhong36725582006-04-19 15:25:02 -0700550 *err = -EBADF;
Al Viro00e188e2014-03-03 23:48:18 -0500551 if (f.file) {
Florent Revestdba4a922020-12-04 12:36:04 +0100552 sock = sock_from_file(f.file);
Al Viro00e188e2014-03-03 23:48:18 -0500553 if (likely(sock)) {
Miaohe Lince787a52020-08-06 19:53:16 +0800554 *fput_needed = f.flags & FDPUT_FPUT;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800555 return sock;
Al Viro00e188e2014-03-03 23:48:18 -0500556 }
Florent Revestdba4a922020-12-04 12:36:04 +0100557 *err = -ENOTSOCK;
Al Viro00e188e2014-03-03 23:48:18 -0500558 fdput(f);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -0800559 }
560 return NULL;
561}
562
Masatake YAMATO600e1772012-08-29 10:44:29 +0000563static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
564 size_t size)
565{
566 ssize_t len;
567 ssize_t used = 0;
568
David Howellsc5ef6032015-03-17 22:26:16 +0000569 len = security_inode_listsecurity(d_inode(dentry), buffer, size);
Masatake YAMATO600e1772012-08-29 10:44:29 +0000570 if (len < 0)
571 return len;
572 used += len;
573 if (buffer) {
574 if (size < used)
575 return -ERANGE;
576 buffer += len;
577 }
578
579 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
580 used += len;
581 if (buffer) {
582 if (size < used)
583 return -ERANGE;
584 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
585 buffer += len;
586 }
587
588 return used;
589}
590
Christian Brauner549c7292021-01-21 14:19:43 +0100591static int sockfs_setattr(struct user_namespace *mnt_userns,
592 struct dentry *dentry, struct iattr *iattr)
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900593{
Christian Brauner549c7292021-01-21 14:19:43 +0100594 int err = simple_setattr(&init_user_ns, dentry, iattr);
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900595
Eric Biggerse1a3a602016-12-30 17:42:32 -0600596 if (!err && (iattr->ia_valid & ATTR_UID)) {
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900597 struct socket *sock = SOCKET_I(d_inode(dentry));
598
Cong Wang6d8c50d2018-06-07 13:39:49 -0700599 if (sock->sk)
600 sock->sk->sk_uid = iattr->ia_uid;
601 else
602 err = -ENOENT;
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900603 }
604
605 return err;
606}
607
Masatake YAMATO600e1772012-08-29 10:44:29 +0000608static const struct inode_operations sockfs_inode_ops = {
Masatake YAMATO600e1772012-08-29 10:44:29 +0000609 .listxattr = sockfs_listxattr,
Lorenzo Colitti86741ec2016-11-04 02:23:41 +0900610 .setattr = sockfs_setattr,
Masatake YAMATO600e1772012-08-29 10:44:29 +0000611};
612
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613/**
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300614 * sock_alloc - allocate a socket
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700615 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 * Allocate a new inode and socket object. The two are bound together
617 * and initialised. The socket is then returned. If we are out of inodes
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300618 * NULL is returned. This functions uses GFP_KERNEL internally.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 */
620
Tom Herbertf4a00aa2016-03-07 14:11:01 -0800621struct socket *sock_alloc(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622{
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700623 struct inode *inode;
624 struct socket *sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625
Eric Dumazeta209dfc2011-07-26 11:36:34 +0200626 inode = new_inode_pseudo(sock_mnt->mnt_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 if (!inode)
628 return NULL;
629
630 sock = SOCKET_I(inode);
631
Christoph Hellwig85fe4022010-10-23 11:19:54 -0400632 inode->i_ino = get_next_ino();
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700633 inode->i_mode = S_IFSOCK | S_IRWXUGO;
David Howells8192b0c2008-11-14 10:39:10 +1100634 inode->i_uid = current_fsuid();
635 inode->i_gid = current_fsgid();
Masatake YAMATO600e1772012-08-29 10:44:29 +0000636 inode->i_op = &sockfs_inode_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 return sock;
639}
Tom Herbertf4a00aa2016-03-07 14:11:01 -0800640EXPORT_SYMBOL(sock_alloc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641
Cong Wang6d8c50d2018-06-07 13:39:49 -0700642static void __sock_release(struct socket *sock, struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643{
644 if (sock->ops) {
645 struct module *owner = sock->ops->owner;
646
Cong Wang6d8c50d2018-06-07 13:39:49 -0700647 if (inode)
648 inode_lock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 sock->ops->release(sock);
Eric Biggersff7b11a2019-02-21 14:13:56 -0800650 sock->sk = NULL;
Cong Wang6d8c50d2018-06-07 13:39:49 -0700651 if (inode)
652 inode_unlock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 sock->ops = NULL;
654 module_put(owner);
655 }
656
Al Viro333f7902019-07-05 20:14:16 +0100657 if (sock->wq.fasync_list)
Yang Yingliang3410f222014-02-12 17:09:55 +0800658 pr_err("%s: fasync list not empty!\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 if (!sock->file) {
661 iput(SOCK_INODE(sock));
662 return;
663 }
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700664 sock->file = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665}
Cong Wang6d8c50d2018-06-07 13:39:49 -0700666
Andrew Lunn9a8ad9a2020-07-13 01:15:12 +0200667/**
668 * sock_release - close a socket
669 * @sock: socket to close
670 *
671 * The socket is released from the protocol stack if it has a release
672 * callback, and the inode is then released if the socket is bound to
673 * an inode not a file.
674 */
Cong Wang6d8c50d2018-06-07 13:39:49 -0700675void sock_release(struct socket *sock)
676{
677 __sock_release(sock, NULL);
678}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700679EXPORT_SYMBOL(sock_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400681void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags)
Patrick Ohly20d49472009-02-12 05:03:38 +0000682{
Eric Dumazet140c55d2014-08-06 11:49:29 +0200683 u8 flags = *tx_flags;
684
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400685 if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200686 flags |= SKBTX_HW_TSTAMP;
687
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400688 if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200689 flags |= SKBTX_SW_TSTAMP;
690
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -0400691 if (tsflags & SOF_TIMESTAMPING_TX_SCHED)
Eric Dumazet140c55d2014-08-06 11:49:29 +0200692 flags |= SKBTX_SCHED_TSTAMP;
693
Eric Dumazet140c55d2014-08-06 11:49:29 +0200694 *tx_flags = flags;
Patrick Ohly20d49472009-02-12 05:03:38 +0000695}
Willem de Bruijn67cc0d42014-09-08 19:58:58 -0400696EXPORT_SYMBOL(__sock_tx_timestamp);
Patrick Ohly20d49472009-02-12 05:03:38 +0000697
Paolo Abeni8c3c4472019-05-03 17:01:39 +0200698INDIRECT_CALLABLE_DECLARE(int inet_sendmsg(struct socket *, struct msghdr *,
699 size_t));
Paolo Abenia648a592019-07-03 16:06:54 +0200700INDIRECT_CALLABLE_DECLARE(int inet6_sendmsg(struct socket *, struct msghdr *,
701 size_t));
Al Virod8725c82014-12-11 00:02:50 -0500702static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703{
Paolo Abenia648a592019-07-03 16:06:54 +0200704 int ret = INDIRECT_CALL_INET(sock->ops->sendmsg, inet6_sendmsg,
705 inet_sendmsg, sock, msg,
706 msg_data_left(msg));
Al Virod8725c82014-12-11 00:02:50 -0500707 BUG_ON(ret == -EIOCBQUEUED);
708 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709}
Gu Zheng0cf00c62014-12-05 15:14:23 +0800710
Jordan Rife1ad7ccd2023-09-21 18:46:41 -0500711static int __sock_sendmsg(struct socket *sock, struct msghdr *msg)
712{
713 int err = security_socket_sendmsg(sock, msg,
714 msg_data_left(msg));
715
716 return err ?: sock_sendmsg_nosec(sock, msg);
717}
718
Randy Dunlap85806af2019-05-18 21:23:07 -0700719/**
720 * sock_sendmsg - send a message through @sock
721 * @sock: socket
722 * @msg: message to send
723 *
724 * Sends @msg through @sock, passing through LSM.
725 * Returns the number of bytes sent, or an error code.
726 */
Al Virod8725c82014-12-11 00:02:50 -0500727int sock_sendmsg(struct socket *sock, struct msghdr *msg)
Gu Zheng0cf00c62014-12-05 15:14:23 +0800728{
Jordan Rife1ad7ccd2023-09-21 18:46:41 -0500729 struct sockaddr_storage *save_addr = (struct sockaddr_storage *)msg->msg_name;
730 struct sockaddr_storage address;
Marc Dionne975d6f62023-12-21 09:12:30 -0400731 int save_len = msg->msg_namelen;
Jordan Rife1ad7ccd2023-09-21 18:46:41 -0500732 int ret;
Ying Xue1b784142015-03-02 15:37:48 +0800733
Jordan Rife1ad7ccd2023-09-21 18:46:41 -0500734 if (msg->msg_name) {
735 memcpy(&address, msg->msg_name, msg->msg_namelen);
736 msg->msg_name = &address;
737 }
738
739 ret = __sock_sendmsg(sock, msg);
740 msg->msg_name = save_addr;
Marc Dionne975d6f62023-12-21 09:12:30 -0400741 msg->msg_namelen = save_len;
Jordan Rife1ad7ccd2023-09-21 18:46:41 -0500742
743 return ret;
Gu Zheng0cf00c62014-12-05 15:14:23 +0800744}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700745EXPORT_SYMBOL(sock_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300747/**
748 * kernel_sendmsg - send a message through @sock (kernel-space)
749 * @sock: socket
750 * @msg: message header
751 * @vec: kernel vec
752 * @num: vec array length
753 * @size: total message data size
754 *
755 * Builds the message data with @vec and sends it through @sock.
756 * Returns the number of bytes sent, or an error code.
757 */
758
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
760 struct kvec *vec, size_t num, size_t size)
761{
David Howellsaa563d72018-10-20 00:57:56 +0100762 iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size);
Al Virod8725c82014-12-11 00:02:50 -0500763 return sock_sendmsg(sock, msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700765EXPORT_SYMBOL(kernel_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300767/**
768 * kernel_sendmsg_locked - send a message through @sock (kernel-space)
769 * @sk: sock
770 * @msg: message header
771 * @vec: output s/g array
772 * @num: output s/g array length
773 * @size: total message data size
774 *
775 * Builds the message data with @vec and sends it through @sock.
776 * Returns the number of bytes sent, or an error code.
777 * Caller must hold @sk.
778 */
779
Tom Herbert306b13e2017-07-28 16:22:41 -0700780int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg,
781 struct kvec *vec, size_t num, size_t size)
782{
783 struct socket *sock = sk->sk_socket;
784
785 if (!sock->ops->sendmsg_locked)
John Fastabenddb5980d2017-08-15 22:31:34 -0700786 return sock_no_sendmsg_locked(sk, msg, size);
Tom Herbert306b13e2017-07-28 16:22:41 -0700787
David Howellsaa563d72018-10-20 00:57:56 +0100788 iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size);
Tom Herbert306b13e2017-07-28 16:22:41 -0700789
790 return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg));
791}
792EXPORT_SYMBOL(kernel_sendmsg_locked);
793
Soheil Hassas Yeganeh8605330a2017-03-18 17:02:59 -0400794static bool skb_is_err_queue(const struct sk_buff *skb)
795{
796 /* pkt_type of skbs enqueued on the error queue are set to
797 * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do
798 * in recvmsg, since skbs received on a local socket will never
799 * have a pkt_type of PACKET_OUTGOING.
800 */
801 return skb->pkt_type == PACKET_OUTGOING;
802}
803
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200804/* On transmit, software and hardware timestamps are returned independently.
805 * As the two skb clones share the hardware timestamp, which may be updated
806 * before the software timestamp is received, a hardware TX timestamp may be
807 * returned only if there is no software TX timestamp. Ignore false software
808 * timestamps, which may be made in the __sock_recv_timestamp() call when the
Deepa Dinamani7f1bc6e2019-02-02 07:34:46 -0800809 * option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200810 * hardware timestamp.
811 */
812static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp)
813{
814 return skb->tstamp && !false_tstamp && skb_is_err_queue(skb);
815}
816
Miroslav Lichvaraad9c8c2017-05-19 17:52:38 +0200817static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb)
818{
819 struct scm_ts_pktinfo ts_pktinfo;
820 struct net_device *orig_dev;
821
822 if (!skb_mac_header_was_set(skb))
823 return;
824
825 memset(&ts_pktinfo, 0, sizeof(ts_pktinfo));
826
827 rcu_read_lock();
828 orig_dev = dev_get_by_napi_id(skb_napi_id(skb));
829 if (orig_dev)
830 ts_pktinfo.if_index = orig_dev->ifindex;
831 rcu_read_unlock();
832
833 ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb);
834 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO,
835 sizeof(ts_pktinfo), &ts_pktinfo);
836}
837
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700838/*
839 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
840 */
841void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
842 struct sk_buff *skb)
843{
Patrick Ohly20d49472009-02-12 05:03:38 +0000844 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
Deepa Dinamani887feae2019-02-02 07:34:50 -0800845 int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW);
Deepa Dinamani97184752019-02-02 07:34:51 -0800846 struct scm_timestamping_internal tss;
847
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200848 int empty = 1, false_tstamp = 0;
Patrick Ohly20d49472009-02-12 05:03:38 +0000849 struct skb_shared_hwtstamps *shhwtstamps =
850 skb_hwtstamps(skb);
Miroslav Lichvarff53c862022-01-05 11:33:26 +0100851 ktime_t hwtstamp;
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700852
Patrick Ohly20d49472009-02-12 05:03:38 +0000853 /* Race occurred between timestamp enabling and packet
854 receiving. Fill in the current time for now. */
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200855 if (need_software_tstamp && skb->tstamp == 0) {
Patrick Ohly20d49472009-02-12 05:03:38 +0000856 __net_timestamp(skb);
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200857 false_tstamp = 1;
858 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000859
860 if (need_software_tstamp) {
861 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
Deepa Dinamani887feae2019-02-02 07:34:50 -0800862 if (new_tstamp) {
863 struct __kernel_sock_timeval tv;
864
865 skb_get_new_timestamp(skb, &tv);
866 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW,
867 sizeof(tv), &tv);
868 } else {
869 struct __kernel_old_timeval tv;
870
871 skb_get_timestamp(skb, &tv);
872 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD,
873 sizeof(tv), &tv);
874 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000875 } else {
Deepa Dinamani887feae2019-02-02 07:34:50 -0800876 if (new_tstamp) {
877 struct __kernel_timespec ts;
878
879 skb_get_new_timestampns(skb, &ts);
880 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW,
881 sizeof(ts), &ts);
882 } else {
Arnd Bergmanndf1b4ba2019-10-25 22:04:46 +0200883 struct __kernel_old_timespec ts;
Deepa Dinamani887feae2019-02-02 07:34:50 -0800884
885 skb_get_timestampns(skb, &ts);
886 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD,
887 sizeof(ts), &ts);
888 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000889 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700890 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000891
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400892 memset(&tss, 0, sizeof(tss));
Willem de Bruijnc1991052014-09-03 12:01:18 -0400893 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) &&
Deepa Dinamani97184752019-02-02 07:34:51 -0800894 ktime_to_timespec64_cond(skb->tstamp, tss.ts + 0))
Patrick Ohly20d49472009-02-12 05:03:38 +0000895 empty = 0;
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400896 if (shhwtstamps &&
Willem de Bruijnb9f40e22014-08-04 22:11:46 -0400897 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
Yangbo Lud7c08822021-06-30 16:12:00 +0800898 !skb_is_swtx_tstamp(skb, false_tstamp)) {
899 if (sk->sk_tsflags & SOF_TIMESTAMPING_BIND_PHC)
Miroslav Lichvarff53c862022-01-05 11:33:26 +0100900 hwtstamp = ptp_convert_timestamp(shhwtstamps,
901 sk->sk_bind_phc);
902 else
903 hwtstamp = shhwtstamps->hwtstamp;
Yangbo Lud7c08822021-06-30 16:12:00 +0800904
Miroslav Lichvarff53c862022-01-05 11:33:26 +0100905 if (ktime_to_timespec64_cond(hwtstamp, tss.ts + 2)) {
Yangbo Lud7c08822021-06-30 16:12:00 +0800906 empty = 0;
907
908 if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) &&
909 !skb_is_err_queue(skb))
910 put_ts_pktinfo(msg, skb);
911 }
Miroslav Lichvaraad9c8c2017-05-19 17:52:38 +0200912 }
Francis Yan1c885802016-11-27 23:07:18 -0800913 if (!empty) {
Deepa Dinamani97184752019-02-02 07:34:51 -0800914 if (sock_flag(sk, SOCK_TSTAMP_NEW))
915 put_cmsg_scm_timestamping64(msg, &tss);
916 else
917 put_cmsg_scm_timestamping(msg, &tss);
Francis Yan1c885802016-11-27 23:07:18 -0800918
Soheil Hassas Yeganeh8605330a2017-03-18 17:02:59 -0400919 if (skb_is_err_queue(skb) && skb->len &&
Soheil Hassas Yeganeh4ef1b282017-03-18 17:03:00 -0400920 SKB_EXT_ERR(skb)->opt_stats)
Francis Yan1c885802016-11-27 23:07:18 -0800921 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS,
922 skb->len, skb->data);
923 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700924}
Arnaldo Carvalho de Melo7c81fd82007-03-10 00:39:35 -0300925EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
926
Johannes Berg6e3e9392011-11-09 10:15:42 +0100927void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
928 struct sk_buff *skb)
929{
930 int ack;
931
932 if (!sock_flag(sk, SOCK_WIFI_STATUS))
933 return;
934 if (!skb->wifi_acked_valid)
935 return;
936
937 ack = skb->wifi_acked;
938
939 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
940}
941EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
942
stephen hemminger11165f12010-10-18 14:27:29 +0000943static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
944 struct sk_buff *skb)
Neil Horman3b885782009-10-12 13:26:31 -0700945{
Eyal Birger744d5a32015-03-01 14:58:31 +0200946 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount)
Neil Horman3b885782009-10-12 13:26:31 -0700947 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
Eyal Birger744d5a32015-03-01 14:58:31 +0200948 sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount);
Neil Horman3b885782009-10-12 13:26:31 -0700949}
950
Eric Dumazet767dd032010-04-28 19:14:43 +0000951void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
Neil Horman3b885782009-10-12 13:26:31 -0700952 struct sk_buff *skb)
953{
954 sock_recv_timestamp(msg, sk, skb);
955 sock_recv_drops(msg, sk, skb);
956}
Eric Dumazet767dd032010-04-28 19:14:43 +0000957EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
Neil Horman3b885782009-10-12 13:26:31 -0700958
Paolo Abeni8c3c4472019-05-03 17:01:39 +0200959INDIRECT_CALLABLE_DECLARE(int inet_recvmsg(struct socket *, struct msghdr *,
Paolo Abenia648a592019-07-03 16:06:54 +0200960 size_t, int));
961INDIRECT_CALLABLE_DECLARE(int inet6_recvmsg(struct socket *, struct msghdr *,
962 size_t, int));
Ying Xue1b784142015-03-02 15:37:48 +0800963static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
Al Viro2da62902015-03-14 21:13:46 -0400964 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965{
Paolo Abenia648a592019-07-03 16:06:54 +0200966 return INDIRECT_CALL_INET(sock->ops->recvmsg, inet6_recvmsg,
967 inet_recvmsg, sock, msg, msg_data_left(msg),
968 flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969}
970
Randy Dunlap85806af2019-05-18 21:23:07 -0700971/**
972 * sock_recvmsg - receive a message from @sock
973 * @sock: socket
974 * @msg: message to receive
975 * @flags: message flags
976 *
977 * Receives @msg from @sock, passing through LSM. Returns the total number
978 * of bytes received, or an error.
979 */
Al Viro2da62902015-03-14 21:13:46 -0400980int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700981{
Al Viro2da62902015-03-14 21:13:46 -0400982 int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700983
Al Viro2da62902015-03-14 21:13:46 -0400984 return err ?: sock_recvmsg_nosec(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700986EXPORT_SYMBOL(sock_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987
Martin Lucinac1249c0a2010-12-10 00:04:05 +0000988/**
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300989 * kernel_recvmsg - Receive a message from a socket (kernel space)
990 * @sock: The socket to receive the message from
991 * @msg: Received message
992 * @vec: Input s/g array for message data
993 * @num: Size of input s/g array
994 * @size: Number of bytes to read
995 * @flags: Message flags (MSG_DONTWAIT, etc...)
Martin Lucinac1249c0a2010-12-10 00:04:05 +0000996 *
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300997 * On return the msg structure contains the scatter/gather array passed in the
998 * vec argument. The array is modified so that it consists of the unfilled
999 * portion of the original array.
Martin Lucinac1249c0a2010-12-10 00:04:05 +00001000 *
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001001 * The returned value is the total number of bytes received, or an error.
Martin Lucinac1249c0a2010-12-10 00:04:05 +00001002 */
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001003
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001004int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
1005 struct kvec *vec, size_t num, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006{
Christoph Hellwig1f466e12020-05-11 13:59:13 +02001007 msg->msg_control_is_user = false;
David Howellsaa563d72018-10-20 00:57:56 +01001008 iov_iter_kvec(&msg->msg_iter, READ, vec, num, size);
Christoph Hellwig1f466e12020-05-11 13:59:13 +02001009 return sock_recvmsg(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001011EXPORT_SYMBOL(kernel_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03001013static ssize_t sock_sendpage(struct file *file, struct page *page,
1014 int offset, size_t size, loff_t *ppos, int more)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015{
1016 struct socket *sock;
1017 int flags;
1018
Eric Dumazetb69aee02005-09-06 14:42:45 -07001019 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020
Eric Dumazet35f9c092012-04-05 03:05:35 +00001021 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
1022 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
1023 flags |= more;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024
Linus Torvaldse6949582009-08-13 08:28:36 -07001025 return kernel_sendpage(sock, page, offset, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026}
1027
Jens Axboe9c55e012007-11-06 23:30:13 -08001028static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001029 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -08001030 unsigned int flags)
1031{
1032 struct socket *sock = file->private_data;
1033
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -08001034 if (unlikely(!sock->ops->splice_read))
Slavomir Kaslev95506582018-11-16 11:27:53 +02001035 return generic_file_splice_read(file, ppos, pipe, len, flags);
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -08001036
Jens Axboe9c55e012007-11-06 23:30:13 -08001037 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
1038}
1039
Al Viro8ae5e0302014-11-28 19:40:50 -05001040static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -08001041{
Al Viro6d652332015-01-30 16:12:56 -05001042 struct file *file = iocb->ki_filp;
1043 struct socket *sock = file->private_data;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -07001044 struct msghdr msg = {.msg_iter = *to,
1045 .msg_iocb = iocb};
Al Viro8ae5e0302014-11-28 19:40:50 -05001046 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -08001047
Jens Axboeebfcd892019-12-09 20:58:56 -07001048 if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT))
Al Viro8ae5e0302014-11-28 19:40:50 -05001049 msg.msg_flags = MSG_DONTWAIT;
1050
1051 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -08001052 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -07001053
Christoph Hellwig66ee59a2015-02-11 19:56:46 +01001054 if (!iov_iter_count(to)) /* Match SYS5 behaviour */
Christoph Hellwigce1d4d32005-12-22 21:08:46 -08001055 return 0;
1056
Al Viro2da62902015-03-14 21:13:46 -04001057 res = sock_recvmsg(sock, &msg, msg.msg_flags);
Al Viro8ae5e0302014-11-28 19:40:50 -05001058 *to = msg.msg_iter;
1059 return res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -08001060}
1061
Al Viro8ae5e0302014-11-28 19:40:50 -05001062static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063{
Al Viro6d652332015-01-30 16:12:56 -05001064 struct file *file = iocb->ki_filp;
1065 struct socket *sock = file->private_data;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -07001066 struct msghdr msg = {.msg_iter = *from,
1067 .msg_iocb = iocb};
Al Viro8ae5e0302014-11-28 19:40:50 -05001068 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -08001069
Al Viro8ae5e0302014-11-28 19:40:50 -05001070 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -08001071 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -07001072
Jens Axboeebfcd892019-12-09 20:58:56 -07001073 if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT))
Al Viro8ae5e0302014-11-28 19:40:50 -05001074 msg.msg_flags = MSG_DONTWAIT;
1075
Al Viro6d652332015-01-30 16:12:56 -05001076 if (sock->type == SOCK_SEQPACKET)
1077 msg.msg_flags |= MSG_EOR;
1078
Jordan Rife1ad7ccd2023-09-21 18:46:41 -05001079 res = __sock_sendmsg(sock, &msg);
Al Viro8ae5e0302014-11-28 19:40:50 -05001080 *from = msg.msg_iter;
1081 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082}
1083
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084/*
1085 * Atomic setting of ioctl hooks to avoid race
1086 * with module unload.
1087 */
1088
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001089static DEFINE_MUTEX(br_ioctl_mutex);
Arnd Bergmannad2f99a2021-07-27 15:45:16 +02001090static int (*br_ioctl_hook)(struct net *net, struct net_bridge *br,
1091 unsigned int cmd, struct ifreq *ifr,
1092 void __user *uarg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093
Arnd Bergmannad2f99a2021-07-27 15:45:16 +02001094void brioctl_set(int (*hook)(struct net *net, struct net_bridge *br,
1095 unsigned int cmd, struct ifreq *ifr,
1096 void __user *uarg))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001098 mutex_lock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 br_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001100 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101}
1102EXPORT_SYMBOL(brioctl_set);
1103
Arnd Bergmannad2f99a2021-07-27 15:45:16 +02001104int br_ioctl_call(struct net *net, struct net_bridge *br, unsigned int cmd,
1105 struct ifreq *ifr, void __user *uarg)
1106{
1107 int err = -ENOPKG;
1108
1109 if (!br_ioctl_hook)
1110 request_module("bridge");
1111
1112 mutex_lock(&br_ioctl_mutex);
1113 if (br_ioctl_hook)
1114 err = br_ioctl_hook(net, br, cmd, ifr, uarg);
1115 mutex_unlock(&br_ioctl_mutex);
1116
1117 return err;
1118}
1119
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001120static DEFINE_MUTEX(vlan_ioctl_mutex);
Eric W. Biederman881d9662007-09-17 11:56:21 -07001121static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122
Eric W. Biederman881d9662007-09-17 11:56:21 -07001123void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001125 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 vlan_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001127 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128}
1129EXPORT_SYMBOL(vlan_ioctl_set);
1130
Arnd Bergmann6b960182009-11-06 23:10:54 -08001131static long sock_do_ioctl(struct net *net, struct socket *sock,
Johannes Berg63ff03a2019-01-25 22:43:17 +01001132 unsigned int cmd, unsigned long arg)
Arnd Bergmann6b960182009-11-06 23:10:54 -08001133{
Arnd Bergmann876f0bf2021-07-22 16:29:02 +02001134 struct ifreq ifr;
1135 bool need_copyout;
Arnd Bergmann6b960182009-11-06 23:10:54 -08001136 int err;
1137 void __user *argp = (void __user *)arg;
Arnd Bergmanna554bf92021-07-27 15:45:12 +02001138 void __user *data;
Arnd Bergmann6b960182009-11-06 23:10:54 -08001139
1140 err = sock->ops->ioctl(sock, cmd, arg);
1141
1142 /*
1143 * If this ioctl is unknown try to hand it down
1144 * to the NIC driver.
1145 */
Al Viro36fd6332017-06-26 13:19:16 -04001146 if (err != -ENOIOCTLCMD)
1147 return err;
Arnd Bergmann6b960182009-11-06 23:10:54 -08001148
Jakub Kicinski29ce8f92021-08-31 09:06:04 -07001149 if (!is_socket_ioctl_cmd(cmd))
1150 return -ENOTTY;
1151
Arnd Bergmanna554bf92021-07-27 15:45:12 +02001152 if (get_user_ifreq(&ifr, &data, argp))
Arnd Bergmann876f0bf2021-07-22 16:29:02 +02001153 return -EFAULT;
Arnd Bergmanna554bf92021-07-27 15:45:12 +02001154 err = dev_ioctl(net, cmd, &ifr, data, &need_copyout);
Arnd Bergmann876f0bf2021-07-22 16:29:02 +02001155 if (!err && need_copyout)
Arnd Bergmanna554bf92021-07-27 15:45:12 +02001156 if (put_user_ifreq(&ifr, argp))
Al Viro36fd6332017-06-26 13:19:16 -04001157 return -EFAULT;
Arnd Bergmann876f0bf2021-07-22 16:29:02 +02001158
Arnd Bergmann6b960182009-11-06 23:10:54 -08001159 return err;
1160}
1161
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162/*
1163 * With an ioctl, arg may well be a user mode pointer, but we don't know
1164 * what to do with it - that's up to the protocol still.
1165 */
1166
1167static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
1168{
1169 struct socket *sock;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001170 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 void __user *argp = (void __user *)arg;
1172 int pid, err;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001173 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174
Eric Dumazetb69aee02005-09-06 14:42:45 -07001175 sock = file->private_data;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001176 sk = sock->sk;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001177 net = sock_net(sk);
Al Viro44c02a22017-10-05 12:59:44 -04001178 if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) {
1179 struct ifreq ifr;
Arnd Bergmanna554bf92021-07-27 15:45:12 +02001180 void __user *data;
Al Viro44c02a22017-10-05 12:59:44 -04001181 bool need_copyout;
Arnd Bergmanna554bf92021-07-27 15:45:12 +02001182 if (get_user_ifreq(&ifr, &data, argp))
Al Viro44c02a22017-10-05 12:59:44 -04001183 return -EFAULT;
Arnd Bergmanna554bf92021-07-27 15:45:12 +02001184 err = dev_ioctl(net, cmd, &ifr, data, &need_copyout);
Al Viro44c02a22017-10-05 12:59:44 -04001185 if (!err && need_copyout)
Arnd Bergmanna554bf92021-07-27 15:45:12 +02001186 if (put_user_ifreq(&ifr, argp))
Al Viro44c02a22017-10-05 12:59:44 -04001187 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001189#ifdef CONFIG_WEXT_CORE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
Al Virob1b0c242017-10-01 20:13:08 -04001191 err = wext_handle_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001193#endif
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001194 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195 case FIOSETOWN:
1196 case SIOCSPGRP:
1197 err = -EFAULT;
1198 if (get_user(pid, (int __user *)argp))
1199 break;
Jiri Slaby393cc3f2017-06-13 13:35:50 +02001200 err = f_setown(sock->file, pid, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 break;
1202 case FIOGETOWN:
1203 case SIOCGPGRP:
Eric W. Biederman609d7fa2006-10-02 02:17:15 -07001204 err = put_user(f_getown(sock->file),
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001205 (int __user *)argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206 break;
1207 case SIOCGIFBR:
1208 case SIOCSIFBR:
1209 case SIOCBRADDBR:
1210 case SIOCBRDELBR:
Arnd Bergmannad2f99a2021-07-27 15:45:16 +02001211 err = br_ioctl_call(net, NULL, cmd, NULL, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 break;
1213 case SIOCGIFVLAN:
1214 case SIOCSIFVLAN:
1215 err = -ENOPKG;
1216 if (!vlan_ioctl_hook)
1217 request_module("8021q");
1218
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001219 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 if (vlan_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001221 err = vlan_ioctl_hook(net, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001222 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 break;
Andrey Vaginc62cce22016-10-24 18:29:13 -07001224 case SIOCGSKNS:
1225 err = -EPERM;
1226 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1227 break;
1228
1229 err = open_related_ns(&net->ns, get_net_ns);
1230 break;
Arnd Bergmann0768e172019-04-17 22:56:11 +02001231 case SIOCGSTAMP_OLD:
1232 case SIOCGSTAMPNS_OLD:
Arnd Bergmannc7cbdbf2019-04-17 22:51:48 +02001233 if (!sock->ops->gettstamp) {
1234 err = -ENOIOCTLCMD;
1235 break;
1236 }
1237 err = sock->ops->gettstamp(sock, argp,
Arnd Bergmann0768e172019-04-17 22:56:11 +02001238 cmd == SIOCGSTAMP_OLD,
1239 !IS_ENABLED(CONFIG_64BIT));
Gustavo A. R. Silva60747822019-04-24 10:31:24 -05001240 break;
Arnd Bergmann0768e172019-04-17 22:56:11 +02001241 case SIOCGSTAMP_NEW:
1242 case SIOCGSTAMPNS_NEW:
1243 if (!sock->ops->gettstamp) {
1244 err = -ENOIOCTLCMD;
1245 break;
1246 }
1247 err = sock->ops->gettstamp(sock, argp,
1248 cmd == SIOCGSTAMP_NEW,
1249 false);
Arnd Bergmannc7cbdbf2019-04-17 22:51:48 +02001250 break;
Arnd Bergmann876f0bf2021-07-22 16:29:02 +02001251
1252 case SIOCGIFCONF:
1253 err = dev_ifconf(net, argp);
1254 break;
1255
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256 default:
Johannes Berg63ff03a2019-01-25 22:43:17 +01001257 err = sock_do_ioctl(net, sock, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001259 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260 return err;
1261}
1262
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001263/**
1264 * sock_create_lite - creates a socket
1265 * @family: protocol family (AF_INET, ...)
1266 * @type: communication type (SOCK_STREAM, ...)
1267 * @protocol: protocol (0, ...)
1268 * @res: new socket
1269 *
1270 * Creates a new socket and assigns it to @res, passing through LSM.
1271 * The new socket initialization is not complete, see kernel_accept().
1272 * Returns 0 or an error. On failure @res is set to %NULL.
1273 * This function internally uses GFP_KERNEL.
1274 */
1275
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276int sock_create_lite(int family, int type, int protocol, struct socket **res)
1277{
1278 int err;
1279 struct socket *sock = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001280
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281 err = security_socket_create(family, type, protocol, 1);
1282 if (err)
1283 goto out;
1284
1285 sock = sock_alloc();
1286 if (!sock) {
1287 err = -ENOMEM;
1288 goto out;
1289 }
1290
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291 sock->type = type;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001292 err = security_socket_post_create(sock, family, type, protocol, 1);
1293 if (err)
1294 goto out_release;
1295
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296out:
1297 *res = sock;
1298 return err;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001299out_release:
1300 sock_release(sock);
1301 sock = NULL;
1302 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001304EXPORT_SYMBOL(sock_create_lite);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305
1306/* No kernel lock held - perfect */
Al Viroade994f2017-07-03 00:01:49 -04001307static __poll_t sock_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308{
Christoph Hellwig3cafb372018-01-09 16:07:34 +01001309 struct socket *sock = file->private_data;
Christoph Hellwiga331de32018-07-30 09:42:13 +02001310 __poll_t events = poll_requested_events(wait), flag = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311
Christoph Hellwige88958e2018-06-29 15:37:24 +02001312 if (!sock->ops->poll)
1313 return 0;
Christoph Hellwigf641f13b2018-07-30 09:42:12 +02001314
Christoph Hellwiga331de32018-07-30 09:42:13 +02001315 if (sk_can_busy_loop(sock->sk)) {
1316 /* poll once if requested by the syscall */
1317 if (events & POLL_BUSY_LOOP)
1318 sk_busy_loop(sock->sk, 1);
1319
1320 /* if this socket can poll_ll, tell the system call */
1321 flag = POLL_BUSY_LOOP;
1322 }
1323
1324 return sock->ops->poll(file, sock, wait) | flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325}
1326
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001327static int sock_mmap(struct file *file, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328{
Eric Dumazetb69aee02005-09-06 14:42:45 -07001329 struct socket *sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330
1331 return sock->ops->mmap(file, sock, vma);
1332}
1333
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03001334static int sock_close(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335{
Cong Wang6d8c50d2018-06-07 13:39:49 -07001336 __sock_release(SOCKET_I(inode), inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 return 0;
1338}
1339
1340/*
1341 * Update the socket async list
1342 *
1343 * Fasync_list locking strategy.
1344 *
1345 * 1. fasync_list is modified only under process context socket lock
1346 * i.e. under semaphore.
1347 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
Eric Dumazet989a2972010-04-14 09:55:35 +00001348 * or under socket lock
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349 */
1350
1351static int sock_fasync(int fd, struct file *filp, int on)
1352{
Eric Dumazet989a2972010-04-14 09:55:35 +00001353 struct socket *sock = filp->private_data;
1354 struct sock *sk = sock->sk;
Al Viro333f7902019-07-05 20:14:16 +01001355 struct socket_wq *wq = &sock->wq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356
Eric Dumazet989a2972010-04-14 09:55:35 +00001357 if (sk == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359
1360 lock_sock(sk);
Eric Dumazeteaefd1102011-02-18 03:26:36 +00001361 fasync_helper(fd, filp, on, &wq->fasync_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362
Eric Dumazeteaefd1102011-02-18 03:26:36 +00001363 if (!wq->fasync_list)
Eric Dumazet989a2972010-04-14 09:55:35 +00001364 sock_reset_flag(sk, SOCK_FASYNC);
Jonathan Corbet76398422009-02-01 14:26:59 -07001365 else
Eric Dumazetbcdce712009-10-06 17:28:29 -07001366 sock_set_flag(sk, SOCK_FASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367
Eric Dumazet989a2972010-04-14 09:55:35 +00001368 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 return 0;
1370}
1371
Eric Dumazetceb5d582015-11-29 20:03:11 -08001372/* This function may be called only under rcu_lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373
Eric Dumazetceb5d582015-11-29 20:03:11 -08001374int sock_wake_async(struct socket_wq *wq, int how, int band)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375{
Eric Dumazetceb5d582015-11-29 20:03:11 -08001376 if (!wq || !wq->fasync_list)
1377 return -1;
Eric Dumazet43815482010-04-29 11:01:49 +00001378
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001379 switch (how) {
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001380 case SOCK_WAKE_WAITD:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001381 if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382 break;
1383 goto call_kill;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001384 case SOCK_WAKE_SPACE:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001385 if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386 break;
Miaohe Lin7c7ab582020-08-08 16:23:10 +08001387 fallthrough;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001388 case SOCK_WAKE_IO:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001389call_kill:
Eric Dumazet43815482010-04-29 11:01:49 +00001390 kill_fasync(&wq->fasync_list, SIGIO, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391 break;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001392 case SOCK_WAKE_URG:
Eric Dumazet43815482010-04-29 11:01:49 +00001393 kill_fasync(&wq->fasync_list, SIGURG, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394 }
Eric Dumazetceb5d582015-11-29 20:03:11 -08001395
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396 return 0;
1397}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001398EXPORT_SYMBOL(sock_wake_async);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001400/**
1401 * __sock_create - creates a socket
1402 * @net: net namespace
1403 * @family: protocol family (AF_INET, ...)
1404 * @type: communication type (SOCK_STREAM, ...)
1405 * @protocol: protocol (0, ...)
1406 * @res: new socket
1407 * @kern: boolean for kernel space sockets
1408 *
1409 * Creates a new socket and assigns it to @res, passing through LSM.
1410 * Returns 0 or an error. On failure @res is set to %NULL. @kern must
1411 * be set to true if the socket resides in kernel space.
1412 * This function internally uses GFP_KERNEL.
1413 */
1414
Pavel Emelyanov721db932010-09-29 16:06:32 +04001415int __sock_create(struct net *net, int family, int type, int protocol,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001416 struct socket **res, int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417{
1418 int err;
1419 struct socket *sock;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001420 const struct net_proto_family *pf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001421
1422 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001423 * Check protocol is in range
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424 */
1425 if (family < 0 || family >= NPROTO)
1426 return -EAFNOSUPPORT;
1427 if (type < 0 || type >= SOCK_MAX)
1428 return -EINVAL;
1429
1430 /* Compatibility.
1431
1432 This uglymoron is moved from INET layer to here to avoid
1433 deadlock in module load.
1434 */
1435 if (family == PF_INET && type == SOCK_PACKET) {
liping.zhangf3c98692016-03-11 23:08:36 +08001436 pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1437 current->comm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438 family = PF_PACKET;
1439 }
1440
1441 err = security_socket_create(family, type, protocol, kern);
1442 if (err)
1443 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001444
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001445 /*
1446 * Allocate the socket and allow the family to set things up. if
1447 * the protocol is 0, the family is instructed to select an appropriate
1448 * default.
1449 */
1450 sock = sock_alloc();
1451 if (!sock) {
Joe Perchese87cc472012-05-13 21:56:26 +00001452 net_warn_ratelimited("socket: no more sockets\n");
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001453 return -ENFILE; /* Not exactly a match, but its the
1454 closest posix thing */
1455 }
1456
1457 sock->type = type;
1458
Johannes Berg95a5afc2008-10-16 15:24:51 -07001459#ifdef CONFIG_MODULES
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001460 /* Attempt to load a protocol module if the find failed.
1461 *
1462 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463 * requested real, full-featured networking support upon configuration.
1464 * Otherwise module support will break!
1465 */
Eric Dumazet190683a2010-11-10 10:50:44 +00001466 if (rcu_access_pointer(net_families[family]) == NULL)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001467 request_module("net-pf-%d", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468#endif
1469
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001470 rcu_read_lock();
1471 pf = rcu_dereference(net_families[family]);
1472 err = -EAFNOSUPPORT;
1473 if (!pf)
1474 goto out_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475
1476 /*
1477 * We will call the ->create function, that possibly is in a loadable
1478 * module, so we have to bump that loadable module refcnt first.
1479 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001480 if (!try_module_get(pf->owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481 goto out_release;
1482
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001483 /* Now protected by module ref count */
1484 rcu_read_unlock();
1485
Eric Paris3f378b62009-11-05 22:18:14 -08001486 err = pf->create(net, sock, protocol, kern);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001487 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488 goto out_module_put;
Frank Filza79af592005-09-27 15:23:38 -07001489
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490 /*
1491 * Now to bump the refcnt of the [loadable] module that owns this
1492 * socket at sock_release time we decrement its refcnt.
1493 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001494 if (!try_module_get(sock->ops->owner))
1495 goto out_module_busy;
1496
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497 /*
1498 * Now that we're done with the ->create function, the [loadable]
1499 * module can have its refcnt decremented
1500 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001501 module_put(pf->owner);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001502 err = security_socket_post_create(sock, family, type, protocol, kern);
1503 if (err)
Herbert Xu3b185522007-08-15 14:46:02 -07001504 goto out_sock_release;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001505 *res = sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001507 return 0;
1508
1509out_module_busy:
1510 err = -EAFNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511out_module_put:
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001512 sock->ops = NULL;
1513 module_put(pf->owner);
1514out_sock_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001515 sock_release(sock);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001516 return err;
1517
1518out_release:
1519 rcu_read_unlock();
1520 goto out_sock_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521}
Pavel Emelyanov721db932010-09-29 16:06:32 +04001522EXPORT_SYMBOL(__sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001524/**
1525 * sock_create - creates a socket
1526 * @family: protocol family (AF_INET, ...)
1527 * @type: communication type (SOCK_STREAM, ...)
1528 * @protocol: protocol (0, ...)
1529 * @res: new socket
1530 *
1531 * A wrapper around __sock_create().
1532 * Returns 0 or an error. This function internally uses GFP_KERNEL.
1533 */
1534
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535int sock_create(int family, int type, int protocol, struct socket **res)
1536{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001537 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001539EXPORT_SYMBOL(sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001541/**
1542 * sock_create_kern - creates a socket (kernel space)
1543 * @net: net namespace
1544 * @family: protocol family (AF_INET, ...)
1545 * @type: communication type (SOCK_STREAM, ...)
1546 * @protocol: protocol (0, ...)
1547 * @res: new socket
1548 *
1549 * A wrapper around __sock_create().
1550 * Returns 0 or an error. This function internally uses GFP_KERNEL.
1551 */
1552
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001553int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554{
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001555 return __sock_create(net, family, type, protocol, res, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001556}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001557EXPORT_SYMBOL(sock_create_kern);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001558
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01001559int __sys_socket(int family, int type, int protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001560{
1561 int retval;
1562 struct socket *sock;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001563 int flags;
1564
Ulrich Dreppere38b36f2008-07-23 21:29:42 -07001565 /* Check the SOCK_* constants for consistency. */
1566 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1567 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1568 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1569 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1570
Ulrich Dreppera677a032008-07-23 21:29:17 -07001571 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001572 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001573 return -EINVAL;
1574 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001576 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1577 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1578
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579 retval = sock_create(family, type, protocol, &sock);
1580 if (retval < 0)
Al Viro8e1611e2017-12-05 23:29:09 +00001581 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001582
Al Viro8e1611e2017-12-05 23:29:09 +00001583 return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584}
1585
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01001586SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
1587{
1588 return __sys_socket(family, type, protocol);
1589}
1590
Linus Torvalds1da177e2005-04-16 15:20:36 -07001591/*
1592 * Create a pair of connected sockets.
1593 */
1594
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01001595int __sys_socketpair(int family, int type, int protocol, int __user *usockvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001596{
1597 struct socket *sock1, *sock2;
1598 int fd1, fd2, err;
Al Virodb349502007-02-07 01:48:00 -05001599 struct file *newfile1, *newfile2;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001600 int flags;
1601
1602 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001603 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001604 return -EINVAL;
1605 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001607 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1608 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1609
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610 /*
Al Viro016a2662017-12-05 23:28:38 +00001611 * reserve descriptors and make sure we won't fail
1612 * to return them to userland.
1613 */
1614 fd1 = get_unused_fd_flags(flags);
1615 if (unlikely(fd1 < 0))
1616 return fd1;
1617
1618 fd2 = get_unused_fd_flags(flags);
1619 if (unlikely(fd2 < 0)) {
1620 put_unused_fd(fd1);
1621 return fd2;
1622 }
1623
1624 err = put_user(fd1, &usockvec[0]);
1625 if (err)
1626 goto out;
1627
1628 err = put_user(fd2, &usockvec[1]);
1629 if (err)
1630 goto out;
1631
1632 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001633 * Obtain the first socket and check if the underlying protocol
1634 * supports the socketpair call.
1635 */
1636
1637 err = sock_create(family, type, protocol, &sock1);
Al Viro016a2662017-12-05 23:28:38 +00001638 if (unlikely(err < 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639 goto out;
1640
1641 err = sock_create(family, type, protocol, &sock2);
Al Viro016a2662017-12-05 23:28:38 +00001642 if (unlikely(err < 0)) {
1643 sock_release(sock1);
1644 goto out;
David S. Millerbf3c23d2007-10-29 21:54:02 -07001645 }
Yann Droneaudd73aa282013-12-09 22:42:20 +01001646
David Herrmannd47cd942018-05-04 16:28:20 +02001647 err = security_socket_socketpair(sock1, sock2);
1648 if (unlikely(err)) {
1649 sock_release(sock2);
1650 sock_release(sock1);
1651 goto out;
1652 }
1653
Al Viro016a2662017-12-05 23:28:38 +00001654 err = sock1->ops->socketpair(sock1, sock2);
1655 if (unlikely(err < 0)) {
1656 sock_release(sock2);
1657 sock_release(sock1);
1658 goto out;
Al Viro28407632012-08-17 23:54:15 -04001659 }
1660
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001661 newfile1 = sock_alloc_file(sock1, flags, NULL);
Viresh Kumarb5ffe632015-08-12 15:59:47 +05301662 if (IS_ERR(newfile1)) {
Al Viro28407632012-08-17 23:54:15 -04001663 err = PTR_ERR(newfile1);
Al Viro016a2662017-12-05 23:28:38 +00001664 sock_release(sock2);
1665 goto out;
Al Viro28407632012-08-17 23:54:15 -04001666 }
1667
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001668 newfile2 = sock_alloc_file(sock2, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -04001669 if (IS_ERR(newfile2)) {
1670 err = PTR_ERR(newfile2);
Al Viro016a2662017-12-05 23:28:38 +00001671 fput(newfile1);
1672 goto out;
Al Virodb349502007-02-07 01:48:00 -05001673 }
1674
Al Viro157cf642008-12-14 04:57:47 -05001675 audit_fd_pair(fd1, fd2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001676
Al Virodb349502007-02-07 01:48:00 -05001677 fd_install(fd1, newfile1);
1678 fd_install(fd2, newfile2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001679 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001680
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681out:
Al Viro016a2662017-12-05 23:28:38 +00001682 put_unused_fd(fd2);
1683 put_unused_fd(fd1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684 return err;
1685}
1686
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01001687SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1688 int __user *, usockvec)
1689{
1690 return __sys_socketpair(family, type, protocol, usockvec);
1691}
1692
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693/*
1694 * Bind a name to a socket. Nothing much to do here since it's
1695 * the protocol's responsibility to handle the local address.
1696 *
1697 * We move the socket address to kernel space before we call
1698 * the protocol layer (having also checked the address is ok).
1699 */
1700
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01001701int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001702{
1703 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001704 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001705 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001706
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001707 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Stephen Hemmingere71a4782007-04-10 20:10:33 -07001708 if (sock) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001709 err = move_addr_to_kernel(umyaddr, addrlen, &address);
Jakub Sitnicki068b88c2018-10-04 11:09:40 +02001710 if (!err) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001711 err = security_socket_bind(sock,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001712 (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001713 addrlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001714 if (!err)
1715 err = sock->ops->bind(sock,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001716 (struct sockaddr *)
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001717 &address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001718 }
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001719 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001720 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001721 return err;
1722}
1723
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01001724SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
1725{
1726 return __sys_bind(fd, umyaddr, addrlen);
1727}
1728
Linus Torvalds1da177e2005-04-16 15:20:36 -07001729/*
1730 * Perform a listen. Basically, we allow the protocol to do anything
1731 * necessary for a listen, and if that works, we mark the socket as
1732 * ready for listening.
1733 */
1734
Dominik Brodowski25e290e2018-03-13 19:36:54 +01001735int __sys_listen(int fd, int backlog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736{
1737 struct socket *sock;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001738 int err, fput_needed;
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001739 int somaxconn;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001740
1741 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1742 if (sock) {
Kuniyuki Iwashimacb9eaed2022-08-23 10:47:00 -07001743 somaxconn = READ_ONCE(sock_net(sock->sk)->core.sysctl_somaxconn);
Eric Dumazet95c96172012-04-15 05:58:06 +00001744 if ((unsigned int)backlog > somaxconn)
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001745 backlog = somaxconn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746
1747 err = security_socket_listen(sock, backlog);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001748 if (!err)
1749 err = sock->ops->listen(sock, backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001750
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001751 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752 }
1753 return err;
1754}
1755
Dominik Brodowski25e290e2018-03-13 19:36:54 +01001756SYSCALL_DEFINE2(listen, int, fd, int, backlog)
1757{
1758 return __sys_listen(fd, backlog);
1759}
1760
Pavel Begunkovd32f89d2021-08-25 12:25:44 +01001761struct file *do_accept(struct file *file, unsigned file_flags,
Jens Axboede2ea4b2019-10-17 14:41:29 -06001762 struct sockaddr __user *upeer_sockaddr,
Pavel Begunkovd32f89d2021-08-25 12:25:44 +01001763 int __user *upeer_addrlen, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001764{
1765 struct socket *sock, *newsock;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001766 struct file *newfile;
Pavel Begunkovd32f89d2021-08-25 12:25:44 +01001767 int err, len;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001768 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001769
Florent Revestdba4a922020-12-04 12:36:04 +01001770 sock = sock_from_file(file);
Pavel Begunkovd32f89d2021-08-25 12:25:44 +01001771 if (!sock)
1772 return ERR_PTR(-ENOTSOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001773
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001774 newsock = sock_alloc();
1775 if (!newsock)
Pavel Begunkovd32f89d2021-08-25 12:25:44 +01001776 return ERR_PTR(-ENFILE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777
1778 newsock->type = sock->type;
1779 newsock->ops = sock->ops;
1780
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781 /*
1782 * We don't need try_module_get here, as the listening socket (sock)
1783 * has the protocol module (sock->ops->owner) held.
1784 */
1785 __module_get(newsock->ops->owner);
1786
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001787 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
Pavel Begunkovd32f89d2021-08-25 12:25:44 +01001788 if (IS_ERR(newfile))
1789 return newfile;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001790
Frank Filza79af592005-09-27 15:23:38 -07001791 err = security_socket_accept(sock, newsock);
1792 if (err)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001793 goto out_fd;
Frank Filza79af592005-09-27 15:23:38 -07001794
Jens Axboede2ea4b2019-10-17 14:41:29 -06001795 err = sock->ops->accept(sock, newsock, sock->file->f_flags | file_flags,
1796 false);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001797 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001798 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001799
1800 if (upeer_sockaddr) {
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001801 len = newsock->ops->getname(newsock,
1802 (struct sockaddr *)&address, 2);
1803 if (len < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001804 err = -ECONNABORTED;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001805 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001806 }
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001807 err = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001808 len, upeer_sockaddr, upeer_addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001809 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001810 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001811 }
1812
1813 /* File flags are not inherited via accept() unlike another OSes. */
Pavel Begunkovd32f89d2021-08-25 12:25:44 +01001814 return newfile;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001815out_fd:
David S. Miller9606a212006-04-01 01:00:14 -08001816 fput(newfile);
Pavel Begunkovd32f89d2021-08-25 12:25:44 +01001817 return ERR_PTR(err);
1818}
Jens Axboede2ea4b2019-10-17 14:41:29 -06001819
Pavel Begunkovd32f89d2021-08-25 12:25:44 +01001820int __sys_accept4_file(struct file *file, unsigned file_flags,
1821 struct sockaddr __user *upeer_sockaddr,
1822 int __user *upeer_addrlen, int flags,
1823 unsigned long nofile)
1824{
1825 struct file *newfile;
1826 int newfd;
1827
1828 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1829 return -EINVAL;
1830
1831 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1832 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1833
1834 newfd = __get_unused_fd_flags(flags, nofile);
1835 if (unlikely(newfd < 0))
1836 return newfd;
1837
1838 newfile = do_accept(file, file_flags, upeer_sockaddr, upeer_addrlen,
1839 flags);
1840 if (IS_ERR(newfile)) {
1841 put_unused_fd(newfd);
1842 return PTR_ERR(newfile);
1843 }
1844 fd_install(newfd, newfile);
1845 return newfd;
Jens Axboede2ea4b2019-10-17 14:41:29 -06001846}
1847
1848/*
1849 * For accept, we attempt to create a new socket, set up the link
1850 * with the client, wake up the client, then return the new
1851 * connected fd. We collect the address of the connector in kernel
1852 * space and move it to user at the very end. This is unclean because
1853 * we open the socket then return an error.
1854 *
1855 * 1003.1g adds the ability to recvmsg() to query connection pending
1856 * status to recvmsg. We need to add that support in a way thats
1857 * clean when we restructure accept also.
1858 */
1859
1860int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr,
1861 int __user *upeer_addrlen, int flags)
1862{
1863 int ret = -EBADF;
1864 struct fd f;
1865
1866 f = fdget(fd);
1867 if (f.file) {
1868 ret = __sys_accept4_file(f.file, 0, upeer_sockaddr,
Jens Axboe09952e32020-03-19 20:16:56 -06001869 upeer_addrlen, flags,
1870 rlimit(RLIMIT_NOFILE));
Miaohe Lin6b07ede2020-08-06 19:52:24 +08001871 fdput(f);
Jens Axboede2ea4b2019-10-17 14:41:29 -06001872 }
1873
1874 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001875}
1876
Dominik Brodowski4541e802018-03-13 19:24:23 +01001877SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1878 int __user *, upeer_addrlen, int, flags)
1879{
1880 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags);
1881}
1882
Heiko Carstens20f37032009-01-14 14:14:23 +01001883SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1884 int __user *, upeer_addrlen)
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001885{
Dominik Brodowski4541e802018-03-13 19:24:23 +01001886 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001887}
1888
Linus Torvalds1da177e2005-04-16 15:20:36 -07001889/*
1890 * Attempt to connect to a socket with the server address. The address
1891 * is in user space so we verify it is OK and move it to kernel space.
1892 *
1893 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1894 * break bindings
1895 *
1896 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1897 * other SEQPACKET protocols that take time to connect() as it doesn't
1898 * include the -EINPROGRESS status for such sockets.
1899 */
1900
Jens Axboef499a022019-12-02 16:28:46 -07001901int __sys_connect_file(struct file *file, struct sockaddr_storage *address,
Jens Axboebd3ded32019-11-23 14:17:16 -07001902 int addrlen, int file_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001903{
1904 struct socket *sock;
Jens Axboebd3ded32019-11-23 14:17:16 -07001905 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001906
Florent Revestdba4a922020-12-04 12:36:04 +01001907 sock = sock_from_file(file);
1908 if (!sock) {
1909 err = -ENOTSOCK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001910 goto out;
Florent Revestdba4a922020-12-04 12:36:04 +01001911 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001912
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001913 err =
Jens Axboef499a022019-12-02 16:28:46 -07001914 security_socket_connect(sock, (struct sockaddr *)address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915 if (err)
Jens Axboebd3ded32019-11-23 14:17:16 -07001916 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001917
Jens Axboef499a022019-12-02 16:28:46 -07001918 err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen,
Jens Axboebd3ded32019-11-23 14:17:16 -07001919 sock->file->f_flags | file_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001920out:
1921 return err;
1922}
1923
Jens Axboebd3ded32019-11-23 14:17:16 -07001924int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen)
1925{
1926 int ret = -EBADF;
1927 struct fd f;
1928
1929 f = fdget(fd);
1930 if (f.file) {
Jens Axboef499a022019-12-02 16:28:46 -07001931 struct sockaddr_storage address;
1932
1933 ret = move_addr_to_kernel(uservaddr, addrlen, &address);
1934 if (!ret)
1935 ret = __sys_connect_file(f.file, &address, addrlen, 0);
Miaohe Lin6b07ede2020-08-06 19:52:24 +08001936 fdput(f);
Jens Axboebd3ded32019-11-23 14:17:16 -07001937 }
1938
1939 return ret;
1940}
1941
Dominik Brodowski1387c2c2018-03-13 19:35:09 +01001942SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1943 int, addrlen)
1944{
1945 return __sys_connect(fd, uservaddr, addrlen);
1946}
1947
Linus Torvalds1da177e2005-04-16 15:20:36 -07001948/*
1949 * Get the local address ('name') of a socket object. Move the obtained
1950 * name to user space.
1951 */
1952
Dominik Brodowski8882a102018-03-13 19:43:14 +01001953int __sys_getsockname(int fd, struct sockaddr __user *usockaddr,
1954 int __user *usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001955{
1956 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001957 struct sockaddr_storage address;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001958 int err, fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001959
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001960 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001961 if (!sock)
1962 goto out;
1963
1964 err = security_socket_getsockname(sock);
1965 if (err)
1966 goto out_put;
1967
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001968 err = sock->ops->getname(sock, (struct sockaddr *)&address, 0);
1969 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001970 goto out_put;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001971 /* "err" is actually length in this case */
1972 err = move_addr_to_user(&address, err, usockaddr, usockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001973
1974out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001975 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976out:
1977 return err;
1978}
1979
Dominik Brodowski8882a102018-03-13 19:43:14 +01001980SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1981 int __user *, usockaddr_len)
1982{
1983 return __sys_getsockname(fd, usockaddr, usockaddr_len);
1984}
1985
Linus Torvalds1da177e2005-04-16 15:20:36 -07001986/*
1987 * Get the remote address ('name') of a socket object. Move the obtained
1988 * name to user space.
1989 */
1990
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01001991int __sys_getpeername(int fd, struct sockaddr __user *usockaddr,
1992 int __user *usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001993{
1994 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001995 struct sockaddr_storage address;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001996 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001997
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001998 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1999 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002000 err = security_socket_getpeername(sock);
2001 if (err) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002002 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002003 return err;
2004 }
2005
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01002006 err = sock->ops->getname(sock, (struct sockaddr *)&address, 1);
2007 if (err >= 0)
2008 /* "err" is actually length in this case */
2009 err = move_addr_to_user(&address, err, usockaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002010 usockaddr_len);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002011 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002012 }
2013 return err;
2014}
2015
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01002016SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
2017 int __user *, usockaddr_len)
2018{
2019 return __sys_getpeername(fd, usockaddr, usockaddr_len);
2020}
2021
Linus Torvalds1da177e2005-04-16 15:20:36 -07002022/*
2023 * Send a datagram to a given address. We move the address into kernel
2024 * space and check the user space data area is readable before invoking
2025 * the protocol.
2026 */
Dominik Brodowski211b6342018-03-13 19:18:52 +01002027int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags,
2028 struct sockaddr __user *addr, int addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002029{
2030 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002031 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002032 int err;
2033 struct msghdr msg;
2034 struct iovec iov;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002035 int fput_needed;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002036
Al Viro602bd0e2015-03-21 19:12:32 -04002037 err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter);
2038 if (unlikely(err))
2039 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08002040 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2041 if (!sock)
David S. Miller4387ff72007-02-08 15:06:08 -08002042 goto out;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002043
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002044 msg.msg_name = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002045 msg.msg_control = NULL;
2046 msg.msg_controllen = 0;
2047 msg.msg_namelen = 0;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002048 if (addr) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002049 err = move_addr_to_kernel(addr, addr_len, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002050 if (err < 0)
2051 goto out_put;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002052 msg.msg_name = (struct sockaddr *)&address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002053 msg.msg_namelen = addr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002054 }
2055 if (sock->file->f_flags & O_NONBLOCK)
2056 flags |= MSG_DONTWAIT;
2057 msg.msg_flags = flags;
Jordan Rife1ad7ccd2023-09-21 18:46:41 -05002058 err = __sock_sendmsg(sock, &msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002059
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002060out_put:
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08002061 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08002062out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002063 return err;
2064}
2065
Dominik Brodowski211b6342018-03-13 19:18:52 +01002066SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
2067 unsigned int, flags, struct sockaddr __user *, addr,
2068 int, addr_len)
2069{
2070 return __sys_sendto(fd, buff, len, flags, addr, addr_len);
2071}
2072
Linus Torvalds1da177e2005-04-16 15:20:36 -07002073/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002074 * Send a datagram down a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075 */
2076
Heiko Carstens3e0fa652009-01-14 14:14:24 +01002077SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
Eric Dumazet95c96172012-04-15 05:58:06 +00002078 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002079{
Dominik Brodowski211b6342018-03-13 19:18:52 +01002080 return __sys_sendto(fd, buff, len, flags, NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002081}
2082
2083/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002084 * Receive a frame from the socket and optionally record the address of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07002085 * sender. We verify the buffers are writable and if needed move the
2086 * sender address from kernel to user space.
2087 */
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002088int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags,
2089 struct sockaddr __user *addr, int __user *addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002090{
2091 struct socket *sock;
2092 struct iovec iov;
2093 struct msghdr msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002094 struct sockaddr_storage address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002095 int err, err2;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002096 int fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002097
Al Viro602bd0e2015-03-21 19:12:32 -04002098 err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter);
2099 if (unlikely(err))
2100 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08002101 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002102 if (!sock)
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08002103 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002104
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002105 msg.msg_control = NULL;
2106 msg.msg_controllen = 0;
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002107 /* Save some cycles and don't copy the address if not needed */
2108 msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
2109 /* We assume all kernel code knows the size of sockaddr_storage */
2110 msg.msg_namelen = 0;
tadeusz.struk@intel.com130ed5d2015-12-15 10:46:17 -08002111 msg.msg_iocb = NULL;
Alexander Potapenko9f138fa2017-03-08 18:08:16 +01002112 msg.msg_flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002113 if (sock->file->f_flags & O_NONBLOCK)
2114 flags |= MSG_DONTWAIT;
Al Viro2da62902015-03-14 21:13:46 -04002115 err = sock_recvmsg(sock, &msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002116
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002117 if (err >= 0 && addr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002118 err2 = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002119 msg.msg_namelen, addr, addr_len);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002120 if (err2 < 0)
2121 err = err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002122 }
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08002123
2124 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08002125out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002126 return err;
2127}
2128
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002129SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
2130 unsigned int, flags, struct sockaddr __user *, addr,
2131 int __user *, addr_len)
2132{
2133 return __sys_recvfrom(fd, ubuf, size, flags, addr, addr_len);
2134}
2135
Linus Torvalds1da177e2005-04-16 15:20:36 -07002136/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002137 * Receive a datagram from a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002138 */
2139
Jan Glauberb7c0ddf2014-04-16 09:32:48 +02002140SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
2141 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002142{
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002143 return __sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002144}
2145
Florian Westphal83f0c102020-07-05 01:30:15 +02002146static bool sock_use_custom_sol_socket(const struct socket *sock)
2147{
2148 const struct sock *sk = sock->sk;
2149
2150 /* Use sock->ops->setsockopt() for MPTCP */
2151 return IS_ENABLED(CONFIG_MPTCP) &&
2152 sk->sk_protocol == IPPROTO_MPTCP &&
2153 sk->sk_type == SOCK_STREAM &&
2154 (sk->sk_family == AF_INET || sk->sk_family == AF_INET6);
2155}
2156
Linus Torvalds1da177e2005-04-16 15:20:36 -07002157/*
2158 * Set a socket option. Because we don't know the option lengths we have
2159 * to pass the user mode parameter for the protocols to sort out.
2160 */
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02002161int __sys_setsockopt(int fd, int level, int optname, char __user *user_optval,
Christoph Hellwig55db9c02020-07-17 08:23:15 +02002162 int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002163{
Christoph Hellwig519a8a62020-08-10 18:42:14 +02002164 sockptr_t optval = USER_SOCKPTR(user_optval);
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002165 char *kernel_optval = NULL;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002166 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002167 struct socket *sock;
2168
2169 if (optlen < 0)
2170 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002171
2172 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Christoph Hellwig4a367292020-07-17 08:23:11 +02002173 if (!sock)
2174 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002175
Christoph Hellwig4a367292020-07-17 08:23:11 +02002176 err = security_socket_setsockopt(sock, level, optname);
2177 if (err)
2178 goto out_put;
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002179
Christoph Hellwig55db9c02020-07-17 08:23:15 +02002180 if (!in_compat_syscall())
2181 err = BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock->sk, &level, &optname,
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02002182 user_optval, &optlen,
Christoph Hellwig55db9c02020-07-17 08:23:15 +02002183 &kernel_optval);
Christoph Hellwig4a367292020-07-17 08:23:11 +02002184 if (err < 0)
2185 goto out_put;
2186 if (err > 0) {
2187 err = 0;
2188 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002189 }
Christoph Hellwig4a367292020-07-17 08:23:11 +02002190
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02002191 if (kernel_optval)
2192 optval = KERNEL_SOCKPTR(kernel_optval);
Christoph Hellwig4a367292020-07-17 08:23:11 +02002193 if (level == SOL_SOCKET && !sock_use_custom_sol_socket(sock))
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02002194 err = sock_setsockopt(sock, level, optname, optval, optlen);
Christoph Hellwiga44d9e72020-07-17 08:23:31 +02002195 else if (unlikely(!sock->ops->setsockopt))
2196 err = -EOPNOTSUPP;
Christoph Hellwig4a367292020-07-17 08:23:11 +02002197 else
2198 err = sock->ops->setsockopt(sock, level, optname, optval,
2199 optlen);
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02002200 kfree(kernel_optval);
Christoph Hellwig4a367292020-07-17 08:23:11 +02002201out_put:
2202 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002203 return err;
2204}
2205
Dominik Brodowskicc36dca2018-03-13 20:10:59 +01002206SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
2207 char __user *, optval, int, optlen)
2208{
2209 return __sys_setsockopt(fd, level, optname, optval, optlen);
2210}
2211
Stanislav Fomichev9cacf812021-01-15 08:34:59 -08002212INDIRECT_CALLABLE_DECLARE(bool tcp_bpf_bypass_getsockopt(int level,
2213 int optname));
2214
Linus Torvalds1da177e2005-04-16 15:20:36 -07002215/*
2216 * Get a socket option. Because we don't know the option lengths we have
2217 * to pass a user mode parameter for the protocols to sort out.
2218 */
Christoph Hellwig55db9c02020-07-17 08:23:15 +02002219int __sys_getsockopt(int fd, int level, int optname, char __user *optval,
2220 int __user *optlen)
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;
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002224 int max_optlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002225
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002226 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Christoph Hellwigd8a9b382020-07-17 08:23:12 +02002227 if (!sock)
2228 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002229
Christoph Hellwigd8a9b382020-07-17 08:23:12 +02002230 err = security_socket_getsockopt(sock, level, optname);
2231 if (err)
2232 goto out_put;
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002233
Christoph Hellwig55db9c02020-07-17 08:23:15 +02002234 if (!in_compat_syscall())
2235 max_optlen = BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen);
Christoph Hellwigd8a9b382020-07-17 08:23:12 +02002236
2237 if (level == SOL_SOCKET)
2238 err = sock_getsockopt(sock, level, optname, optval, optlen);
Christoph Hellwiga44d9e72020-07-17 08:23:31 +02002239 else if (unlikely(!sock->ops->getsockopt))
2240 err = -EOPNOTSUPP;
Christoph Hellwigd8a9b382020-07-17 08:23:12 +02002241 else
2242 err = sock->ops->getsockopt(sock, level, optname, optval,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002243 optlen);
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002244
Christoph Hellwig55db9c02020-07-17 08:23:15 +02002245 if (!in_compat_syscall())
2246 err = BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock->sk, level, optname,
2247 optval, optlen, max_optlen,
2248 err);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002249out_put:
Christoph Hellwigd8a9b382020-07-17 08:23:12 +02002250 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002251 return err;
2252}
2253
Dominik Brodowski13a2d702018-03-13 20:15:04 +01002254SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
2255 char __user *, optval, int __user *, optlen)
2256{
2257 return __sys_getsockopt(fd, level, optname, optval, optlen);
2258}
2259
Linus Torvalds1da177e2005-04-16 15:20:36 -07002260/*
2261 * Shutdown a socket.
2262 */
2263
Jens Axboeb713c192020-09-05 11:13:35 -06002264int __sys_shutdown_sock(struct socket *sock, int how)
2265{
2266 int err;
2267
2268 err = security_socket_shutdown(sock, how);
2269 if (!err)
2270 err = sock->ops->shutdown(sock, how);
2271
2272 return err;
2273}
2274
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01002275int __sys_shutdown(int fd, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002276{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002277 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002278 struct socket *sock;
2279
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002280 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2281 if (sock != NULL) {
Jens Axboeb713c192020-09-05 11:13:35 -06002282 err = __sys_shutdown_sock(sock, how);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002283 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002284 }
2285 return err;
2286}
2287
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01002288SYSCALL_DEFINE2(shutdown, int, fd, int, how)
2289{
2290 return __sys_shutdown(fd, how);
2291}
2292
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002293/* A couple of helpful macros for getting the address of the 32/64 bit
Linus Torvalds1da177e2005-04-16 15:20:36 -07002294 * fields which are the same type (int / unsigned) on our platforms.
2295 */
2296#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
2297#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
2298#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
2299
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002300struct used_address {
2301 struct sockaddr_storage name;
2302 unsigned int name_len;
2303};
2304
Jens Axboe0a384ab2020-02-27 08:11:20 -07002305int __copy_msghdr_from_user(struct msghdr *kmsg,
2306 struct user_msghdr __user *umsg,
2307 struct sockaddr __user **save_addr,
2308 struct iovec __user **uiov, size_t *nsegs)
Dan Carpenter1661bf32013-10-03 00:27:20 +03002309{
Al Viroffb07552017-06-27 19:32:04 -04002310 struct user_msghdr msg;
Al Viro08adb7d2014-11-10 20:23:13 -05002311 ssize_t err;
2312
Al Viroffb07552017-06-27 19:32:04 -04002313 if (copy_from_user(&msg, umsg, sizeof(*umsg)))
Dan Carpenter1661bf32013-10-03 00:27:20 +03002314 return -EFAULT;
Matthew Leachdbb490b2014-03-11 11:58:27 +00002315
Christoph Hellwig1f466e12020-05-11 13:59:13 +02002316 kmsg->msg_control_is_user = true;
2317 kmsg->msg_control_user = msg.msg_control;
Al Viroffb07552017-06-27 19:32:04 -04002318 kmsg->msg_controllen = msg.msg_controllen;
2319 kmsg->msg_flags = msg.msg_flags;
2320
2321 kmsg->msg_namelen = msg.msg_namelen;
2322 if (!msg.msg_name)
Ani Sinha6a2a2b32014-09-08 14:49:59 -07002323 kmsg->msg_namelen = 0;
2324
Matthew Leachdbb490b2014-03-11 11:58:27 +00002325 if (kmsg->msg_namelen < 0)
2326 return -EINVAL;
2327
Dan Carpenter1661bf32013-10-03 00:27:20 +03002328 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
Dan Carpenterdb31c552013-11-27 15:40:21 +03002329 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
Al Viro08adb7d2014-11-10 20:23:13 -05002330
2331 if (save_addr)
Al Viroffb07552017-06-27 19:32:04 -04002332 *save_addr = msg.msg_name;
Al Viro08adb7d2014-11-10 20:23:13 -05002333
Al Viroffb07552017-06-27 19:32:04 -04002334 if (msg.msg_name && kmsg->msg_namelen) {
Al Viro08adb7d2014-11-10 20:23:13 -05002335 if (!save_addr) {
Paolo Abeni864d9662017-07-21 18:49:45 +02002336 err = move_addr_to_kernel(msg.msg_name,
2337 kmsg->msg_namelen,
Al Viro08adb7d2014-11-10 20:23:13 -05002338 kmsg->msg_name);
2339 if (err < 0)
2340 return err;
2341 }
2342 } else {
2343 kmsg->msg_name = NULL;
2344 kmsg->msg_namelen = 0;
2345 }
2346
Al Viroffb07552017-06-27 19:32:04 -04002347 if (msg.msg_iovlen > UIO_MAXIOV)
Al Viro08adb7d2014-11-10 20:23:13 -05002348 return -EMSGSIZE;
2349
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -07002350 kmsg->msg_iocb = NULL;
Jens Axboe0a384ab2020-02-27 08:11:20 -07002351 *uiov = msg.msg_iov;
2352 *nsegs = msg.msg_iovlen;
2353 return 0;
2354}
2355
2356static int copy_msghdr_from_user(struct msghdr *kmsg,
2357 struct user_msghdr __user *umsg,
2358 struct sockaddr __user **save_addr,
2359 struct iovec **iov)
2360{
2361 struct user_msghdr msg;
2362 ssize_t err;
2363
2364 err = __copy_msghdr_from_user(kmsg, umsg, save_addr, &msg.msg_iov,
2365 &msg.msg_iovlen);
2366 if (err)
2367 return err;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -07002368
Jens Axboe87e5e6d2019-05-14 16:02:22 -06002369 err = import_iovec(save_addr ? READ : WRITE,
Al Viroffb07552017-06-27 19:32:04 -04002370 msg.msg_iov, msg.msg_iovlen,
Al Viroda184282015-03-21 19:29:06 -04002371 UIO_FASTIOV, iov, &kmsg->msg_iter);
Jens Axboe87e5e6d2019-05-14 16:02:22 -06002372 return err < 0 ? err : 0;
Dan Carpenter1661bf32013-10-03 00:27:20 +03002373}
2374
Jens Axboe4257c8c2019-11-25 14:27:34 -07002375static int ____sys_sendmsg(struct socket *sock, struct msghdr *msg_sys,
2376 unsigned int flags, struct used_address *used_address,
2377 unsigned int allowed_msghdr_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002378{
Alex Williamsonb9d717a2005-09-26 14:28:02 -07002379 unsigned char ctl[sizeof(struct cmsghdr) + 20]
Amit Kushwaha846cc122016-12-08 18:21:53 +05302380 __aligned(sizeof(__kernel_size_t));
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002381 /* 20 is size of ipv6_pktinfo */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002382 unsigned char *ctl_buf = ctl;
Al Virod8725c82014-12-11 00:02:50 -05002383 int ctl_len;
Al Viro08adb7d2014-11-10 20:23:13 -05002384 ssize_t err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002385
Linus Torvalds1da177e2005-04-16 15:20:36 -07002386 err = -ENOBUFS;
2387
Anton Blanchard228e5482011-05-02 20:21:35 +00002388 if (msg_sys->msg_controllen > INT_MAX)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002389 goto out;
Tom Herbert28a94d82016-03-07 14:11:02 -08002390 flags |= (msg_sys->msg_flags & allowed_msghdr_flags);
Anton Blanchard228e5482011-05-02 20:21:35 +00002391 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002392 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002393 err =
Anton Blanchard228e5482011-05-02 20:21:35 +00002394 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002395 sizeof(ctl));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002396 if (err)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002397 goto out;
Anton Blanchard228e5482011-05-02 20:21:35 +00002398 ctl_buf = msg_sys->msg_control;
2399 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002400 } else if (ctl_len) {
David S. Millerac4340f2017-01-04 13:24:19 -05002401 BUILD_BUG_ON(sizeof(struct cmsghdr) !=
2402 CMSG_ALIGN(sizeof(struct cmsghdr)));
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002403 if (ctl_len > sizeof(ctl)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002404 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002405 if (ctl_buf == NULL)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002406 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002407 }
2408 err = -EFAULT;
Christoph Hellwig1f466e12020-05-11 13:59:13 +02002409 if (copy_from_user(ctl_buf, msg_sys->msg_control_user, ctl_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002410 goto out_freectl;
Anton Blanchard228e5482011-05-02 20:21:35 +00002411 msg_sys->msg_control = ctl_buf;
Christoph Hellwig1f466e12020-05-11 13:59:13 +02002412 msg_sys->msg_control_is_user = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002413 }
Anton Blanchard228e5482011-05-02 20:21:35 +00002414 msg_sys->msg_flags = flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002415
2416 if (sock->file->f_flags & O_NONBLOCK)
Anton Blanchard228e5482011-05-02 20:21:35 +00002417 msg_sys->msg_flags |= MSG_DONTWAIT;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002418 /*
2419 * If this is sendmmsg() and current destination address is same as
2420 * previously succeeded address, omit asking LSM's decision.
2421 * used_address->name_len is initialized to UINT_MAX so that the first
2422 * destination address never matches.
2423 */
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07002424 if (used_address && msg_sys->msg_name &&
2425 used_address->name_len == msg_sys->msg_namelen &&
2426 !memcmp(&used_address->name, msg_sys->msg_name,
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002427 used_address->name_len)) {
Al Virod8725c82014-12-11 00:02:50 -05002428 err = sock_sendmsg_nosec(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002429 goto out_freectl;
2430 }
Jordan Rife1ad7ccd2023-09-21 18:46:41 -05002431 err = __sock_sendmsg(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002432 /*
2433 * If this is sendmmsg() and sending to current destination address was
2434 * successful, remember it.
2435 */
2436 if (used_address && err >= 0) {
2437 used_address->name_len = msg_sys->msg_namelen;
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07002438 if (msg_sys->msg_name)
2439 memcpy(&used_address->name, msg_sys->msg_name,
2440 used_address->name_len);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002441 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002442
2443out_freectl:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002444 if (ctl_buf != ctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002445 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
Jens Axboe4257c8c2019-11-25 14:27:34 -07002446out:
2447 return err;
2448}
2449
Jens Axboe03b12302019-12-02 18:50:25 -07002450int sendmsg_copy_msghdr(struct msghdr *msg,
2451 struct user_msghdr __user *umsg, unsigned flags,
2452 struct iovec **iov)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002453{
2454 int err;
2455
2456 if (flags & MSG_CMSG_COMPAT) {
2457 struct compat_msghdr __user *msg_compat;
2458
2459 msg_compat = (struct compat_msghdr __user *) umsg;
2460 err = get_compat_msghdr(msg, msg_compat, NULL, iov);
2461 } else {
2462 err = copy_msghdr_from_user(msg, umsg, NULL, iov);
2463 }
2464 if (err < 0)
2465 return err;
2466
2467 return 0;
2468}
2469
2470static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
2471 struct msghdr *msg_sys, unsigned int flags,
2472 struct used_address *used_address,
2473 unsigned int allowed_msghdr_flags)
2474{
2475 struct sockaddr_storage address;
2476 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
2477 ssize_t err;
2478
2479 msg_sys->msg_name = &address;
2480
2481 err = sendmsg_copy_msghdr(msg_sys, msg, flags, &iov);
2482 if (err < 0)
2483 return err;
2484
2485 err = ____sys_sendmsg(sock, msg_sys, flags, used_address,
2486 allowed_msghdr_flags);
Al Viroda184282015-03-21 19:29:06 -04002487 kfree(iov);
Anton Blanchard228e5482011-05-02 20:21:35 +00002488 return err;
2489}
2490
2491/*
2492 * BSD sendmsg interface
2493 */
Jens Axboe03b12302019-12-02 18:50:25 -07002494long __sys_sendmsg_sock(struct socket *sock, struct msghdr *msg,
Jens Axboe0fa03c62019-04-19 13:34:07 -06002495 unsigned int flags)
2496{
Jens Axboe03b12302019-12-02 18:50:25 -07002497 return ____sys_sendmsg(sock, msg, flags, NULL, 0);
Jens Axboe0fa03c62019-04-19 13:34:07 -06002498}
Anton Blanchard228e5482011-05-02 20:21:35 +00002499
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002500long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
2501 bool forbid_cmsg_compat)
Anton Blanchard228e5482011-05-02 20:21:35 +00002502{
2503 int fput_needed, err;
2504 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002505 struct socket *sock;
Anton Blanchard228e5482011-05-02 20:21:35 +00002506
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002507 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2508 return -EINVAL;
2509
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002510 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Anton Blanchard228e5482011-05-02 20:21:35 +00002511 if (!sock)
2512 goto out;
2513
Tom Herbert28a94d82016-03-07 14:11:02 -08002514 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0);
Anton Blanchard228e5482011-05-02 20:21:35 +00002515
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002516 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002517out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002518 return err;
2519}
2520
Al Viro666547f2014-04-06 14:03:05 -04002521SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags)
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002522{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002523 return __sys_sendmsg(fd, msg, flags, true);
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002524}
2525
Anton Blanchard228e5482011-05-02 20:21:35 +00002526/*
2527 * Linux sendmmsg interface
2528 */
2529
2530int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002531 unsigned int flags, bool forbid_cmsg_compat)
Anton Blanchard228e5482011-05-02 20:21:35 +00002532{
2533 int fput_needed, err, datagrams;
2534 struct socket *sock;
2535 struct mmsghdr __user *entry;
2536 struct compat_mmsghdr __user *compat_entry;
2537 struct msghdr msg_sys;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002538 struct used_address used_address;
Tom Herbertf0922762016-03-07 14:11:03 -08002539 unsigned int oflags = flags;
Anton Blanchard228e5482011-05-02 20:21:35 +00002540
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002541 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2542 return -EINVAL;
2543
Anton Blanchard98382f42011-08-04 14:07:39 +00002544 if (vlen > UIO_MAXIOV)
2545 vlen = UIO_MAXIOV;
Anton Blanchard228e5482011-05-02 20:21:35 +00002546
2547 datagrams = 0;
2548
2549 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2550 if (!sock)
2551 return err;
2552
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002553 used_address.name_len = UINT_MAX;
Anton Blanchard228e5482011-05-02 20:21:35 +00002554 entry = mmsg;
2555 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Anton Blanchard728ffb82011-08-04 14:07:38 +00002556 err = 0;
Tom Herbertf0922762016-03-07 14:11:03 -08002557 flags |= MSG_BATCH;
Anton Blanchard228e5482011-05-02 20:21:35 +00002558
2559 while (datagrams < vlen) {
Tom Herbertf0922762016-03-07 14:11:03 -08002560 if (datagrams == vlen - 1)
2561 flags = oflags;
2562
Anton Blanchard228e5482011-05-02 20:21:35 +00002563 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002564 err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002565 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002566 if (err < 0)
2567 break;
2568 err = __put_user(err, &compat_entry->msg_len);
2569 ++compat_entry;
2570 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002571 err = ___sys_sendmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002572 (struct user_msghdr __user *)entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002573 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002574 if (err < 0)
2575 break;
2576 err = put_user(err, &entry->msg_len);
2577 ++entry;
2578 }
2579
2580 if (err)
2581 break;
2582 ++datagrams;
Soheil Hassas Yeganeh30238982016-11-04 15:36:49 -04002583 if (msg_data_left(&msg_sys))
2584 break;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002585 cond_resched();
Anton Blanchard228e5482011-05-02 20:21:35 +00002586 }
2587
Anton Blanchard228e5482011-05-02 20:21:35 +00002588 fput_light(sock->file, fput_needed);
2589
Anton Blanchard728ffb82011-08-04 14:07:38 +00002590 /* We only return an error if no datagrams were able to be sent */
2591 if (datagrams != 0)
Anton Blanchard228e5482011-05-02 20:21:35 +00002592 return datagrams;
2593
Anton Blanchard228e5482011-05-02 20:21:35 +00002594 return err;
2595}
2596
2597SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2598 unsigned int, vlen, unsigned int, flags)
2599{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002600 return __sys_sendmmsg(fd, mmsg, vlen, flags, true);
Anton Blanchard228e5482011-05-02 20:21:35 +00002601}
2602
Jens Axboe03b12302019-12-02 18:50:25 -07002603int recvmsg_copy_msghdr(struct msghdr *msg,
2604 struct user_msghdr __user *umsg, unsigned flags,
2605 struct sockaddr __user **uaddr,
2606 struct iovec **iov)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002607{
2608 ssize_t err;
2609
2610 if (MSG_CMSG_COMPAT & flags) {
2611 struct compat_msghdr __user *msg_compat;
2612
2613 msg_compat = (struct compat_msghdr __user *) umsg;
2614 err = get_compat_msghdr(msg, msg_compat, uaddr, iov);
2615 } else {
2616 err = copy_msghdr_from_user(msg, umsg, uaddr, iov);
2617 }
2618 if (err < 0)
2619 return err;
2620
2621 return 0;
2622}
2623
2624static int ____sys_recvmsg(struct socket *sock, struct msghdr *msg_sys,
2625 struct user_msghdr __user *msg,
2626 struct sockaddr __user *uaddr,
2627 unsigned int flags, int nosec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002628{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002629 struct compat_msghdr __user *msg_compat =
Jens Axboe4257c8c2019-11-25 14:27:34 -07002630 (struct compat_msghdr __user *) msg;
2631 int __user *uaddr_len = COMPAT_NAMELEN(msg);
2632 struct sockaddr_storage addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002633 unsigned long cmsg_ptr;
Al Viro2da62902015-03-14 21:13:46 -04002634 int len;
Al Viro08adb7d2014-11-10 20:23:13 -05002635 ssize_t err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002636
Al Viro08adb7d2014-11-10 20:23:13 -05002637 msg_sys->msg_name = &addr;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002638 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2639 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002640
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002641 /* We assume all kernel code knows the size of sockaddr_storage */
2642 msg_sys->msg_namelen = 0;
2643
Linus Torvalds1da177e2005-04-16 15:20:36 -07002644 if (sock->file->f_flags & O_NONBLOCK)
2645 flags |= MSG_DONTWAIT;
Eric Dumazet1af66222019-12-06 09:38:36 -08002646
2647 if (unlikely(nosec))
2648 err = sock_recvmsg_nosec(sock, msg_sys, flags);
2649 else
2650 err = sock_recvmsg(sock, msg_sys, flags);
2651
Linus Torvalds1da177e2005-04-16 15:20:36 -07002652 if (err < 0)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002653 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002654 len = err;
2655
2656 if (uaddr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002657 err = move_addr_to_user(&addr,
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002658 msg_sys->msg_namelen, uaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002659 uaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002660 if (err < 0)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002661 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002662 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002663 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
David S. Miller37f7f422005-09-16 16:51:01 -07002664 COMPAT_FLAGS(msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002665 if (err)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002666 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002667 if (MSG_CMSG_COMPAT & flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002668 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002669 &msg_compat->msg_controllen);
2670 else
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002671 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002672 &msg->msg_controllen);
2673 if (err)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002674 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002675 err = len;
Jens Axboe4257c8c2019-11-25 14:27:34 -07002676out:
2677 return err;
2678}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002679
Jens Axboe4257c8c2019-11-25 14:27:34 -07002680static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
2681 struct msghdr *msg_sys, unsigned int flags, int nosec)
2682{
2683 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
2684 /* user mode address pointers */
2685 struct sockaddr __user *uaddr;
2686 ssize_t err;
2687
2688 err = recvmsg_copy_msghdr(msg_sys, msg, flags, &uaddr, &iov);
2689 if (err < 0)
2690 return err;
2691
2692 err = ____sys_recvmsg(sock, msg_sys, msg, uaddr, flags, nosec);
Al Viroda184282015-03-21 19:29:06 -04002693 kfree(iov);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002694 return err;
2695}
2696
2697/*
2698 * BSD recvmsg interface
2699 */
2700
Jens Axboe03b12302019-12-02 18:50:25 -07002701long __sys_recvmsg_sock(struct socket *sock, struct msghdr *msg,
2702 struct user_msghdr __user *umsg,
2703 struct sockaddr __user *uaddr, unsigned int flags)
Jens Axboeaa1fa282019-04-19 13:38:09 -06002704{
Jens Axboe03b12302019-12-02 18:50:25 -07002705 return ____sys_recvmsg(sock, msg, umsg, uaddr, flags, 0);
Jens Axboeaa1fa282019-04-19 13:38:09 -06002706}
2707
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002708long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
2709 bool forbid_cmsg_compat)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002710{
2711 int fput_needed, err;
2712 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002713 struct socket *sock;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002714
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002715 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2716 return -EINVAL;
2717
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002718 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002719 if (!sock)
2720 goto out;
2721
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002722 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002723
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002724 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002725out:
2726 return err;
2727}
2728
Al Viro666547f2014-04-06 14:03:05 -04002729SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002730 unsigned int, flags)
2731{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002732 return __sys_recvmsg(fd, msg, flags, true);
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002733}
2734
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002735/*
2736 * Linux recvmmsg interface
2737 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002738
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002739static int do_recvmmsg(int fd, struct mmsghdr __user *mmsg,
2740 unsigned int vlen, unsigned int flags,
2741 struct timespec64 *timeout)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002742{
2743 int fput_needed, err, datagrams;
2744 struct socket *sock;
2745 struct mmsghdr __user *entry;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002746 struct compat_mmsghdr __user *compat_entry;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002747 struct msghdr msg_sys;
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002748 struct timespec64 end_time;
2749 struct timespec64 timeout64;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002750
2751 if (timeout &&
2752 poll_select_set_timeout(&end_time, timeout->tv_sec,
2753 timeout->tv_nsec))
2754 return -EINVAL;
2755
2756 datagrams = 0;
2757
2758 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2759 if (!sock)
2760 return err;
2761
Soheil Hassas Yeganeh7797dc42018-02-27 18:22:40 -05002762 if (likely(!(flags & MSG_ERRQUEUE))) {
2763 err = sock_error(sock->sk);
2764 if (err) {
2765 datagrams = err;
2766 goto out_put;
2767 }
Maxime Jayate623a9e2017-02-21 18:35:51 +01002768 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002769
2770 entry = mmsg;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002771 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002772
2773 while (datagrams < vlen) {
2774 /*
2775 * No need to ask LSM for more than the first datagram.
2776 */
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002777 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002778 err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002779 &msg_sys, flags & ~MSG_WAITFORONE,
2780 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002781 if (err < 0)
2782 break;
2783 err = __put_user(err, &compat_entry->msg_len);
2784 ++compat_entry;
2785 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002786 err = ___sys_recvmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002787 (struct user_msghdr __user *)entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002788 &msg_sys, flags & ~MSG_WAITFORONE,
2789 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002790 if (err < 0)
2791 break;
2792 err = put_user(err, &entry->msg_len);
2793 ++entry;
2794 }
2795
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002796 if (err)
2797 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002798 ++datagrams;
2799
Brandon L Black71c5c1592010-03-26 16:18:03 +00002800 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2801 if (flags & MSG_WAITFORONE)
2802 flags |= MSG_DONTWAIT;
2803
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002804 if (timeout) {
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002805 ktime_get_ts64(&timeout64);
Arnd Bergmannc2e6c852018-04-18 13:42:25 +02002806 *timeout = timespec64_sub(end_time, timeout64);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002807 if (timeout->tv_sec < 0) {
2808 timeout->tv_sec = timeout->tv_nsec = 0;
2809 break;
2810 }
2811
2812 /* Timeout, return less than vlen datagrams */
2813 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2814 break;
2815 }
2816
2817 /* Out of band data, return right away */
2818 if (msg_sys.msg_flags & MSG_OOB)
2819 break;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002820 cond_resched();
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002821 }
2822
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002823 if (err == 0)
2824 goto out_put;
2825
2826 if (datagrams == 0) {
2827 datagrams = err;
2828 goto out_put;
2829 }
2830
2831 /*
2832 * We may return less entries than requested (vlen) if the
2833 * sock is non block and there aren't enough datagrams...
2834 */
2835 if (err != -EAGAIN) {
2836 /*
2837 * ... or if recvmsg returns an error after we
2838 * received some datagrams, where we record the
2839 * error to return on the next call or if the
2840 * app asks about it using getsockopt(SO_ERROR).
2841 */
Eric Dumazet159a81d2023-05-09 16:35:53 +00002842 WRITE_ONCE(sock->sk->sk_err, -err);
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002843 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002844out_put:
2845 fput_light(sock->file, fput_needed);
2846
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002847 return datagrams;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002848}
2849
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002850int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg,
2851 unsigned int vlen, unsigned int flags,
2852 struct __kernel_timespec __user *timeout,
2853 struct old_timespec32 __user *timeout32)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002854{
2855 int datagrams;
Arnd Bergmannc2e6c852018-04-18 13:42:25 +02002856 struct timespec64 timeout_sys;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002857
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002858 if (timeout && get_timespec64(&timeout_sys, timeout))
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002859 return -EFAULT;
2860
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002861 if (timeout32 && get_old_timespec32(&timeout_sys, timeout32))
2862 return -EFAULT;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002863
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002864 if (!timeout && !timeout32)
2865 return do_recvmmsg(fd, mmsg, vlen, flags, NULL);
2866
2867 datagrams = do_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2868
2869 if (datagrams <= 0)
2870 return datagrams;
2871
2872 if (timeout && put_timespec64(&timeout_sys, timeout))
2873 datagrams = -EFAULT;
2874
2875 if (timeout32 && put_old_timespec32(&timeout_sys, timeout32))
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002876 datagrams = -EFAULT;
2877
2878 return datagrams;
2879}
2880
Dominik Brodowski1255e262018-03-13 20:44:21 +01002881SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2882 unsigned int, vlen, unsigned int, flags,
Arnd Bergmannc2e6c852018-04-18 13:42:25 +02002883 struct __kernel_timespec __user *, timeout)
Dominik Brodowski1255e262018-03-13 20:44:21 +01002884{
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002885 if (flags & MSG_CMSG_COMPAT)
2886 return -EINVAL;
2887
2888 return __sys_recvmmsg(fd, mmsg, vlen, flags, timeout, NULL);
Dominik Brodowski1255e262018-03-13 20:44:21 +01002889}
2890
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002891#ifdef CONFIG_COMPAT_32BIT_TIME
2892SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct mmsghdr __user *, mmsg,
2893 unsigned int, vlen, unsigned int, flags,
2894 struct old_timespec32 __user *, timeout)
2895{
2896 if (flags & MSG_CMSG_COMPAT)
2897 return -EINVAL;
2898
2899 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL, timeout);
2900}
2901#endif
2902
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002903#ifdef __ARCH_WANT_SYS_SOCKETCALL
Linus Torvalds1da177e2005-04-16 15:20:36 -07002904/* Argument list sizes for sys_socketcall */
2905#define AL(x) ((x) * sizeof(unsigned long))
Anton Blanchard228e5482011-05-02 20:21:35 +00002906static const unsigned char nargs[21] = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002907 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2908 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2909 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
Anton Blanchard228e5482011-05-02 20:21:35 +00002910 AL(4), AL(5), AL(4)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002911};
2912
Linus Torvalds1da177e2005-04-16 15:20:36 -07002913#undef AL
2914
2915/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002916 * System call vectors.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002917 *
2918 * Argument checking cleaned up. Saved 20% in size.
2919 * This function doesn't need to set the kernel lock because
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002920 * it is set by the callees.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002921 */
2922
Heiko Carstens3e0fa652009-01-14 14:14:24 +01002923SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002924{
Chen Gang2950fa92013-04-07 16:55:23 +08002925 unsigned long a[AUDITSC_ARGS];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002926 unsigned long a0, a1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002927 int err;
Arjan van de Ven47379052009-09-28 12:57:44 -07002928 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002929
Anton Blanchard228e5482011-05-02 20:21:35 +00002930 if (call < 1 || call > SYS_SENDMMSG)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002931 return -EINVAL;
Jeremy Clinec8e8cd52018-07-27 22:43:01 +00002932 call = array_index_nospec(call, SYS_SENDMMSG + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002933
Arjan van de Ven47379052009-09-28 12:57:44 -07002934 len = nargs[call];
2935 if (len > sizeof(a))
2936 return -EINVAL;
2937
Linus Torvalds1da177e2005-04-16 15:20:36 -07002938 /* copy_from_user should be SMP safe. */
Arjan van de Ven47379052009-09-28 12:57:44 -07002939 if (copy_from_user(a, args, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002940 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002941
Chen Gang2950fa92013-04-07 16:55:23 +08002942 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2943 if (err)
2944 return err;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002945
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002946 a0 = a[0];
2947 a1 = a[1];
2948
2949 switch (call) {
2950 case SYS_SOCKET:
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01002951 err = __sys_socket(a0, a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002952 break;
2953 case SYS_BIND:
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01002954 err = __sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002955 break;
2956 case SYS_CONNECT:
Dominik Brodowski1387c2c2018-03-13 19:35:09 +01002957 err = __sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002958 break;
2959 case SYS_LISTEN:
Dominik Brodowski25e290e2018-03-13 19:36:54 +01002960 err = __sys_listen(a0, a1);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002961 break;
2962 case SYS_ACCEPT:
Dominik Brodowski4541e802018-03-13 19:24:23 +01002963 err = __sys_accept4(a0, (struct sockaddr __user *)a1,
2964 (int __user *)a[2], 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002965 break;
2966 case SYS_GETSOCKNAME:
2967 err =
Dominik Brodowski8882a102018-03-13 19:43:14 +01002968 __sys_getsockname(a0, (struct sockaddr __user *)a1,
2969 (int __user *)a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002970 break;
2971 case SYS_GETPEERNAME:
2972 err =
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01002973 __sys_getpeername(a0, (struct sockaddr __user *)a1,
2974 (int __user *)a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002975 break;
2976 case SYS_SOCKETPAIR:
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01002977 err = __sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002978 break;
2979 case SYS_SEND:
Dominik Brodowskif3bf8962018-03-13 19:52:00 +01002980 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3],
2981 NULL, 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002982 break;
2983 case SYS_SENDTO:
Dominik Brodowski211b6342018-03-13 19:18:52 +01002984 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3],
2985 (struct sockaddr __user *)a[4], a[5]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002986 break;
2987 case SYS_RECV:
Dominik Brodowskid27e9af2018-03-13 19:54:17 +01002988 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2989 NULL, NULL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002990 break;
2991 case SYS_RECVFROM:
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002992 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2993 (struct sockaddr __user *)a[4],
2994 (int __user *)a[5]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002995 break;
2996 case SYS_SHUTDOWN:
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01002997 err = __sys_shutdown(a0, a1);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002998 break;
2999 case SYS_SETSOCKOPT:
Dominik Brodowskicc36dca2018-03-13 20:10:59 +01003000 err = __sys_setsockopt(a0, a1, a[2], (char __user *)a[3],
3001 a[4]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003002 break;
3003 case SYS_GETSOCKOPT:
3004 err =
Dominik Brodowski13a2d702018-03-13 20:15:04 +01003005 __sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
3006 (int __user *)a[4]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003007 break;
3008 case SYS_SENDMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01003009 err = __sys_sendmsg(a0, (struct user_msghdr __user *)a1,
3010 a[2], true);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003011 break;
Anton Blanchard228e5482011-05-02 20:21:35 +00003012 case SYS_SENDMMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01003013 err = __sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2],
3014 a[3], true);
Anton Blanchard228e5482011-05-02 20:21:35 +00003015 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003016 case SYS_RECVMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01003017 err = __sys_recvmsg(a0, (struct user_msghdr __user *)a1,
3018 a[2], true);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003019 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07003020 case SYS_RECVMMSG:
Arnd Bergmann3ca47e92019-04-23 17:43:50 +02003021 if (IS_ENABLED(CONFIG_64BIT))
Arnd Bergmanne11d4282018-04-18 13:43:52 +02003022 err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1,
3023 a[2], a[3],
3024 (struct __kernel_timespec __user *)a[4],
3025 NULL);
3026 else
3027 err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1,
3028 a[2], a[3], NULL,
3029 (struct old_timespec32 __user *)a[4]);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07003030 break;
Ulrich Drepperde11def2008-11-19 15:36:14 -08003031 case SYS_ACCEPT4:
Dominik Brodowski4541e802018-03-13 19:24:23 +01003032 err = __sys_accept4(a0, (struct sockaddr __user *)a1,
3033 (int __user *)a[2], a[3]);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07003034 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003035 default:
3036 err = -EINVAL;
3037 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003038 }
3039 return err;
3040}
3041
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003042#endif /* __ARCH_WANT_SYS_SOCKETCALL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003043
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003044/**
3045 * sock_register - add a socket protocol handler
3046 * @ops: description of protocol
3047 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003048 * This function is called by a protocol handler that wants to
3049 * advertise its address family, and have it linked into the
Masanari Iidae793c0f2014-09-04 23:44:36 +09003050 * socket interface. The value ops->family corresponds to the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003051 * socket system call protocol family.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003052 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07003053int sock_register(const struct net_proto_family *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003054{
3055 int err;
3056
3057 if (ops->family >= NPROTO) {
Yang Yingliang3410f222014-02-12 17:09:55 +08003058 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003059 return -ENOBUFS;
3060 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003061
3062 spin_lock(&net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +00003063 if (rcu_dereference_protected(net_families[ops->family],
3064 lockdep_is_held(&net_family_lock)))
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003065 err = -EEXIST;
3066 else {
Eric Dumazetcf778b02012-01-12 04:41:32 +00003067 rcu_assign_pointer(net_families[ops->family], ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003068 err = 0;
3069 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003070 spin_unlock(&net_family_lock);
3071
Yejune Dengfe0bdbd2021-06-21 13:12:25 +08003072 pr_info("NET: Registered %s protocol family\n", pf_family_names[ops->family]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003073 return err;
3074}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003075EXPORT_SYMBOL(sock_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003076
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003077/**
3078 * sock_unregister - remove a protocol handler
3079 * @family: protocol family to remove
3080 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003081 * This function is called by a protocol handler that wants to
3082 * remove its address family, and have it unlinked from the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003083 * new socket creation.
3084 *
3085 * If protocol handler is a module, then it can use module reference
3086 * counts to protect against new references. If protocol handler is not
3087 * a module then it needs to provide its own protection in
3088 * the ops->create routine.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003089 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07003090void sock_unregister(int family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003091{
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07003092 BUG_ON(family < 0 || family >= NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003093
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003094 spin_lock(&net_family_lock);
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +00003095 RCU_INIT_POINTER(net_families[family], NULL);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003096 spin_unlock(&net_family_lock);
3097
3098 synchronize_rcu();
3099
Yejune Dengfe0bdbd2021-06-21 13:12:25 +08003100 pr_info("NET: Unregistered %s protocol family\n", pf_family_names[family]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003101}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003102EXPORT_SYMBOL(sock_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003103
Xin Longbf2ae2e2018-03-10 18:57:50 +08003104bool sock_is_registered(int family)
3105{
Jeremy Cline66b51b02018-08-13 22:23:13 +00003106 return family < NPROTO && rcu_access_pointer(net_families[family]);
Xin Longbf2ae2e2018-03-10 18:57:50 +08003107}
3108
Andi Kleen77d76ea2005-12-22 12:43:42 -08003109static int __init sock_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003110{
Nick Pigginb3e19d92011-01-07 17:50:11 +11003111 int err;
Eric W. Biederman2ca794e2012-04-19 13:20:32 +00003112 /*
3113 * Initialize the network sysctl infrastructure.
3114 */
3115 err = net_sysctl_init();
3116 if (err)
3117 goto out;
Nick Pigginb3e19d92011-01-07 17:50:11 +11003118
Linus Torvalds1da177e2005-04-16 15:20:36 -07003119 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003120 * Initialize skbuff SLAB cache
Linus Torvalds1da177e2005-04-16 15:20:36 -07003121 */
3122 skb_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003123
3124 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003125 * Initialize the protocols module.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003126 */
3127
3128 init_inodecache();
Nick Pigginb3e19d92011-01-07 17:50:11 +11003129
3130 err = register_filesystem(&sock_fs_type);
3131 if (err)
Miaohe Lin47260ba2020-08-06 19:54:19 +08003132 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003133 sock_mnt = kern_mount(&sock_fs_type);
Nick Pigginb3e19d92011-01-07 17:50:11 +11003134 if (IS_ERR(sock_mnt)) {
3135 err = PTR_ERR(sock_mnt);
3136 goto out_mount;
3137 }
Andi Kleen77d76ea2005-12-22 12:43:42 -08003138
3139 /* The real protocol initialization is performed in later initcalls.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003140 */
3141
3142#ifdef CONFIG_NETFILTER
Pablo Neira Ayuso6d11cfd2013-05-22 22:42:36 +00003143 err = netfilter_init();
3144 if (err)
3145 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003146#endif
David S. Millercbeb3212005-12-22 12:58:55 -08003147
Daniel Borkmann408eccc2014-04-01 16:20:23 +02003148 ptp_classifier_init();
Richard Cochranc1f19b52010-07-17 08:49:36 +00003149
Nick Pigginb3e19d92011-01-07 17:50:11 +11003150out:
3151 return err;
3152
3153out_mount:
3154 unregister_filesystem(&sock_fs_type);
Nick Pigginb3e19d92011-01-07 17:50:11 +11003155 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003156}
3157
Andi Kleen77d76ea2005-12-22 12:43:42 -08003158core_initcall(sock_init); /* early initcall */
3159
Linus Torvalds1da177e2005-04-16 15:20:36 -07003160#ifdef CONFIG_PROC_FS
3161void socket_seq_show(struct seq_file *seq)
3162{
Tonghao Zhang648845a2017-12-14 05:51:58 -08003163 seq_printf(seq, "sockets: used %d\n",
3164 sock_inuse_get(seq->private));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003165}
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003166#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003167
Arnd Bergmann29c49642021-07-22 16:29:03 +02003168/* Handle the fact that while struct ifreq has the same *layout* on
3169 * 32/64 for everything but ifreq::ifru_ifmap and ifreq::ifru_data,
3170 * which are handled elsewhere, it still has different *size* due to
3171 * ifreq::ifru_ifmap (which is 16 bytes on 32 bit, 24 bytes on 64-bit,
3172 * resulting in struct ifreq being 32 and 40 bytes respectively).
3173 * As a result, if the struct happens to be at the end of a page and
3174 * the next page isn't readable/writable, we get a fault. To prevent
3175 * that, copy back and forth to the full size.
3176 */
3177int get_user_ifreq(struct ifreq *ifr, void __user **ifrdata, void __user *arg)
3178{
3179 if (in_compat_syscall()) {
3180 struct compat_ifreq *ifr32 = (struct compat_ifreq *)ifr;
3181
3182 memset(ifr, 0, sizeof(*ifr));
3183 if (copy_from_user(ifr32, arg, sizeof(*ifr32)))
3184 return -EFAULT;
3185
3186 if (ifrdata)
3187 *ifrdata = compat_ptr(ifr32->ifr_data);
3188
3189 return 0;
3190 }
3191
3192 if (copy_from_user(ifr, arg, sizeof(*ifr)))
3193 return -EFAULT;
3194
3195 if (ifrdata)
3196 *ifrdata = ifr->ifr_data;
3197
3198 return 0;
3199}
3200EXPORT_SYMBOL(get_user_ifreq);
3201
3202int put_user_ifreq(struct ifreq *ifr, void __user *arg)
3203{
3204 size_t size = sizeof(*ifr);
3205
3206 if (in_compat_syscall())
3207 size = sizeof(struct compat_ifreq);
3208
3209 if (copy_to_user(arg, ifr, size))
3210 return -EFAULT;
3211
3212 return 0;
3213}
3214EXPORT_SYMBOL(put_user_ifreq);
3215
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003216#ifdef CONFIG_COMPAT
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003217static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
3218{
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003219 compat_uptr_t uptr32;
Al Viro44c02a22017-10-05 12:59:44 -04003220 struct ifreq ifr;
3221 void __user *saved;
3222 int err;
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003223
Arnd Bergmann29c49642021-07-22 16:29:03 +02003224 if (get_user_ifreq(&ifr, NULL, uifr32))
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003225 return -EFAULT;
3226
3227 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
3228 return -EFAULT;
3229
Al Viro44c02a22017-10-05 12:59:44 -04003230 saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc;
3231 ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr32);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003232
Arnd Bergmanna554bf92021-07-27 15:45:12 +02003233 err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL, NULL);
Al Viro44c02a22017-10-05 12:59:44 -04003234 if (!err) {
3235 ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved;
Arnd Bergmann29c49642021-07-22 16:29:03 +02003236 if (put_user_ifreq(&ifr, uifr32))
Al Viro44c02a22017-10-05 12:59:44 -04003237 err = -EFAULT;
Joe Perchesccbd6a52010-05-14 10:58:26 +00003238 }
Al Viro44c02a22017-10-05 12:59:44 -04003239 return err;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003240}
3241
Ben Hutchings590d4692013-11-18 17:04:13 +00003242/* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
3243static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
Arnd Bergmann6b960182009-11-06 23:10:54 -08003244 struct compat_ifreq __user *u_ifreq32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003245{
Al Viro44c02a22017-10-05 12:59:44 -04003246 struct ifreq ifreq;
Arnd Bergmanna554bf92021-07-27 15:45:12 +02003247 void __user *data;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003248
Peter Collingbourned0efb162021-08-26 12:46:01 -07003249 if (!is_socket_ioctl_cmd(cmd))
3250 return -ENOTTY;
Arnd Bergmanna554bf92021-07-27 15:45:12 +02003251 if (get_user_ifreq(&ifreq, &data, u_ifreq32))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003252 return -EFAULT;
Arnd Bergmanna554bf92021-07-27 15:45:12 +02003253 ifreq.ifr_data = data;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003254
Arnd Bergmanna554bf92021-07-27 15:45:12 +02003255 return dev_ioctl(net, cmd, &ifreq, data, NULL);
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003256}
3257
Arnd Bergmann7a229382009-11-06 23:00:29 -08003258/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3259 * for some operations; this forces use of the newer bridge-utils that
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003260 * use compatible ioctls
Arnd Bergmann7a229382009-11-06 23:00:29 -08003261 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003262static int old_bridge_ioctl(compat_ulong_t __user *argp)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003263{
Arnd Bergmann6b960182009-11-06 23:10:54 -08003264 compat_ulong_t tmp;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003265
Arnd Bergmann6b960182009-11-06 23:10:54 -08003266 if (get_user(tmp, argp))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003267 return -EFAULT;
3268 if (tmp == BRCTL_GET_VERSION)
3269 return BRCTL_VERSION + 1;
3270 return -EINVAL;
3271}
3272
Arnd Bergmann6b960182009-11-06 23:10:54 -08003273static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3274 unsigned int cmd, unsigned long arg)
3275{
3276 void __user *argp = compat_ptr(arg);
3277 struct sock *sk = sock->sk;
3278 struct net *net = sock_net(sk);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003279
Arnd Bergmann6b960182009-11-06 23:10:54 -08003280 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
Arnd Bergmann88fc0232021-07-27 15:45:15 +02003281 return sock_ioctl(file, cmd, (unsigned long)argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003282
Arnd Bergmann6b960182009-11-06 23:10:54 -08003283 switch (cmd) {
3284 case SIOCSIFBR:
3285 case SIOCGIFBR:
3286 return old_bridge_ioctl(argp);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003287 case SIOCWANDEV:
3288 return compat_siocwandev(net, argp);
Arnd Bergmann0768e172019-04-17 22:56:11 +02003289 case SIOCGSTAMP_OLD:
3290 case SIOCGSTAMPNS_OLD:
Arnd Bergmannc7cbdbf2019-04-17 22:51:48 +02003291 if (!sock->ops->gettstamp)
3292 return -ENOIOCTLCMD;
Arnd Bergmann0768e172019-04-17 22:56:11 +02003293 return sock->ops->gettstamp(sock, argp, cmd == SIOCGSTAMP_OLD,
Arnd Bergmannc7cbdbf2019-04-17 22:51:48 +02003294 !COMPAT_USE_64BIT_TIME);
3295
Arnd Bergmanndd98d282021-07-22 16:28:59 +02003296 case SIOCETHTOOL:
Ben Hutchings590d4692013-11-18 17:04:13 +00003297 case SIOCBONDSLAVEINFOQUERY:
3298 case SIOCBONDINFOQUERY:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003299 case SIOCSHWTSTAMP:
Ben Hutchingsfd468c72013-11-14 01:19:29 +00003300 case SIOCGHWTSTAMP:
Ben Hutchings590d4692013-11-18 17:04:13 +00003301 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003302
Arnd Bergmann6b960182009-11-06 23:10:54 -08003303 case FIOSETOWN:
3304 case SIOCSPGRP:
3305 case FIOGETOWN:
3306 case SIOCGPGRP:
3307 case SIOCBRADDBR:
3308 case SIOCBRDELBR:
3309 case SIOCGIFVLAN:
3310 case SIOCSIFVLAN:
Andrey Vaginc62cce22016-10-24 18:29:13 -07003311 case SIOCGSKNS:
Arnd Bergmann0768e172019-04-17 22:56:11 +02003312 case SIOCGSTAMP_NEW:
3313 case SIOCGSTAMPNS_NEW:
Arnd Bergmann876f0bf2021-07-22 16:29:02 +02003314 case SIOCGIFCONF:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003315 return sock_ioctl(file, cmd, arg);
3316
3317 case SIOCGIFFLAGS:
3318 case SIOCSIFFLAGS:
Arnd Bergmann709566d2021-07-22 16:29:00 +02003319 case SIOCGIFMAP:
3320 case SIOCSIFMAP:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003321 case SIOCGIFMETRIC:
3322 case SIOCSIFMETRIC:
3323 case SIOCGIFMTU:
3324 case SIOCSIFMTU:
3325 case SIOCGIFMEM:
3326 case SIOCSIFMEM:
3327 case SIOCGIFHWADDR:
3328 case SIOCSIFHWADDR:
3329 case SIOCADDMULTI:
3330 case SIOCDELMULTI:
3331 case SIOCGIFINDEX:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003332 case SIOCGIFADDR:
3333 case SIOCSIFADDR:
3334 case SIOCSIFHWBROADCAST:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003335 case SIOCDIFADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003336 case SIOCGIFBRDADDR:
3337 case SIOCSIFBRDADDR:
3338 case SIOCGIFDSTADDR:
3339 case SIOCSIFDSTADDR:
3340 case SIOCGIFNETMASK:
3341 case SIOCSIFNETMASK:
3342 case SIOCSIFPFLAGS:
3343 case SIOCGIFPFLAGS:
3344 case SIOCGIFTXQLEN:
3345 case SIOCSIFTXQLEN:
3346 case SIOCBRADDIF:
3347 case SIOCBRDELIF:
Johannes Bergc6c9fee2019-01-25 22:43:19 +01003348 case SIOCGIFNAME:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003349 case SIOCSIFNAME:
3350 case SIOCGMIIPHY:
3351 case SIOCGMIIREG:
3352 case SIOCSMIIREG:
Al Virof92d4fc2017-09-30 19:32:17 -04003353 case SIOCBONDENSLAVE:
3354 case SIOCBONDRELEASE:
3355 case SIOCBONDSETHWADDR:
3356 case SIOCBONDCHANGEACTIVE:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003357 case SIOCSARP:
3358 case SIOCGARP:
3359 case SIOCDARP:
Arnd Bergmannc7dc5042019-06-03 23:07:12 +02003360 case SIOCOUTQ:
Arnd Bergmann9d7bf412019-06-03 23:06:00 +02003361 case SIOCOUTQNSD:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003362 case SIOCATMARK:
Johannes Berg63ff03a2019-01-25 22:43:17 +01003363 return sock_do_ioctl(net, sock, cmd, arg);
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003364 }
3365
Arnd Bergmann6b960182009-11-06 23:10:54 -08003366 return -ENOIOCTLCMD;
3367}
Arnd Bergmann7a229382009-11-06 23:00:29 -08003368
Eric Dumazet95c96172012-04-15 05:58:06 +00003369static long compat_sock_ioctl(struct file *file, unsigned int cmd,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003370 unsigned long arg)
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003371{
3372 struct socket *sock = file->private_data;
3373 int ret = -ENOIOCTLCMD;
David S. Miller87de87d2008-06-03 09:14:03 -07003374 struct sock *sk;
3375 struct net *net;
3376
3377 sk = sock->sk;
3378 net = sock_net(sk);
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003379
3380 if (sock->ops->compat_ioctl)
3381 ret = sock->ops->compat_ioctl(sock, cmd, arg);
3382
David S. Miller87de87d2008-06-03 09:14:03 -07003383 if (ret == -ENOIOCTLCMD &&
3384 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3385 ret = compat_wext_handle_ioctl(net, cmd, arg);
3386
Arnd Bergmann6b960182009-11-06 23:10:54 -08003387 if (ret == -ENOIOCTLCMD)
3388 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3389
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003390 return ret;
3391}
3392#endif
3393
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003394/**
3395 * kernel_bind - bind an address to a socket (kernel space)
3396 * @sock: socket
3397 * @addr: address
3398 * @addrlen: length of address
3399 *
3400 * Returns 0 or an error.
3401 */
3402
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003403int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3404{
Jordan Rife5b5e5822023-09-21 18:46:42 -05003405 struct sockaddr_storage address;
3406
3407 memcpy(&address, addr, addrlen);
3408
3409 return sock->ops->bind(sock, (struct sockaddr *)&address, addrlen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003410}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003411EXPORT_SYMBOL(kernel_bind);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003412
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003413/**
3414 * kernel_listen - move socket to listening state (kernel space)
3415 * @sock: socket
3416 * @backlog: pending connections queue size
3417 *
3418 * Returns 0 or an error.
3419 */
3420
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003421int kernel_listen(struct socket *sock, int backlog)
3422{
3423 return sock->ops->listen(sock, backlog);
3424}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003425EXPORT_SYMBOL(kernel_listen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003426
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003427/**
3428 * kernel_accept - accept a connection (kernel space)
3429 * @sock: listening socket
3430 * @newsock: new connected socket
3431 * @flags: flags
3432 *
3433 * @flags must be SOCK_CLOEXEC, SOCK_NONBLOCK or 0.
3434 * If it fails, @newsock is guaranteed to be %NULL.
3435 * Returns 0 or an error.
3436 */
3437
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003438int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3439{
3440 struct sock *sk = sock->sk;
3441 int err;
3442
3443 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3444 newsock);
3445 if (err < 0)
3446 goto done;
3447
David Howellscdfbabf2017-03-09 08:09:05 +00003448 err = sock->ops->accept(sock, *newsock, flags, true);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003449 if (err < 0) {
3450 sock_release(*newsock);
Tony Battersbyfa8705b2007-10-10 21:09:04 -07003451 *newsock = NULL;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003452 goto done;
3453 }
3454
3455 (*newsock)->ops = sock->ops;
Wei Yongjun1b085342008-12-18 19:35:10 -08003456 __module_get((*newsock)->ops->owner);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003457
3458done:
3459 return err;
3460}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003461EXPORT_SYMBOL(kernel_accept);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003462
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003463/**
3464 * kernel_connect - connect a socket (kernel space)
3465 * @sock: socket
3466 * @addr: address
3467 * @addrlen: address length
3468 * @flags: flags (O_NONBLOCK, ...)
3469 *
Lu Weif1dcffc2021-03-25 11:01:55 +08003470 * For datagram sockets, @addr is the address to which datagrams are sent
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003471 * by default, and the only address from which datagrams are received.
3472 * For stream sockets, attempts to connect to @addr.
3473 * Returns 0 or an error code.
3474 */
3475
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003476int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
YOSHIFUJI Hideaki4768fbc2007-02-09 23:25:31 +09003477 int flags)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003478{
Jordan Rife759d51e2023-08-21 16:45:23 -05003479 struct sockaddr_storage address;
3480
3481 memcpy(&address, addr, addrlen);
3482
3483 return sock->ops->connect(sock, (struct sockaddr *)&address, addrlen, flags);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003484}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003485EXPORT_SYMBOL(kernel_connect);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003486
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003487/**
3488 * kernel_getsockname - get the address which the socket is bound (kernel space)
3489 * @sock: socket
3490 * @addr: address holder
3491 *
3492 * Fills the @addr pointer with the address which the socket is bound.
3493 * Returns 0 or an error code.
3494 */
3495
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003496int kernel_getsockname(struct socket *sock, struct sockaddr *addr)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003497{
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003498 return sock->ops->getname(sock, addr, 0);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003499}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003500EXPORT_SYMBOL(kernel_getsockname);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003501
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003502/**
Miaohe Lin645f0892020-08-27 07:27:49 -04003503 * kernel_getpeername - get the address which the socket is connected (kernel space)
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003504 * @sock: socket
3505 * @addr: address holder
3506 *
3507 * Fills the @addr pointer with the address which the socket is connected.
3508 * Returns 0 or an error code.
3509 */
3510
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003511int kernel_getpeername(struct socket *sock, struct sockaddr *addr)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003512{
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003513 return sock->ops->getname(sock, addr, 1);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003514}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003515EXPORT_SYMBOL(kernel_getpeername);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003516
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003517/**
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003518 * kernel_sendpage - send a &page through a socket (kernel space)
3519 * @sock: socket
3520 * @page: page
3521 * @offset: page offset
3522 * @size: total size in bytes
3523 * @flags: flags (MSG_DONTWAIT, ...)
3524 *
3525 * Returns the total amount sent in bytes or an error.
3526 */
3527
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003528int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3529 size_t size, int flags)
3530{
Coly Li7b62d312020-10-02 16:27:29 +08003531 if (sock->ops->sendpage) {
3532 /* Warn in case the improper page to zero-copy send */
3533 WARN_ONCE(!sendpage_ok(page), "improper page for zero-copy send");
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003534 return sock->ops->sendpage(sock, page, offset, size, flags);
Coly Li7b62d312020-10-02 16:27:29 +08003535 }
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003536 return sock_no_sendpage(sock, page, offset, size, flags);
3537}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003538EXPORT_SYMBOL(kernel_sendpage);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003539
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003540/**
3541 * kernel_sendpage_locked - send a &page through the locked sock (kernel space)
3542 * @sk: sock
3543 * @page: page
3544 * @offset: page offset
3545 * @size: total size in bytes
3546 * @flags: flags (MSG_DONTWAIT, ...)
3547 *
3548 * Returns the total amount sent in bytes or an error.
3549 * Caller must hold @sk.
3550 */
3551
Tom Herbert306b13e2017-07-28 16:22:41 -07003552int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset,
3553 size_t size, int flags)
3554{
3555 struct socket *sock = sk->sk_socket;
3556
3557 if (sock->ops->sendpage_locked)
3558 return sock->ops->sendpage_locked(sk, page, offset, size,
3559 flags);
3560
3561 return sock_no_sendpage_locked(sk, page, offset, size, flags);
3562}
3563EXPORT_SYMBOL(kernel_sendpage_locked);
3564
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003565/**
Miaohe Lin645f0892020-08-27 07:27:49 -04003566 * kernel_sock_shutdown - shut down part of a full-duplex connection (kernel space)
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003567 * @sock: socket
3568 * @how: connection part
3569 *
3570 * Returns 0 or an error.
3571 */
3572
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003573int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3574{
3575 return sock->ops->shutdown(sock, how);
3576}
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003577EXPORT_SYMBOL(kernel_sock_shutdown);
R. Parameswaran113c3072017-04-05 16:50:35 -07003578
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003579/**
3580 * kernel_sock_ip_overhead - returns the IP overhead imposed by a socket
3581 * @sk: socket
3582 *
3583 * This routine returns the IP overhead imposed by a socket i.e.
3584 * the length of the underlying IP header, depending on whether
3585 * this is an IPv4 or IPv6 socket and the length from IP options turned
3586 * on at the socket. Assumes that the caller has a lock on the socket.
R. Parameswaran113c3072017-04-05 16:50:35 -07003587 */
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003588
R. Parameswaran113c3072017-04-05 16:50:35 -07003589u32 kernel_sock_ip_overhead(struct sock *sk)
3590{
3591 struct inet_sock *inet;
3592 struct ip_options_rcu *opt;
3593 u32 overhead = 0;
R. Parameswaran113c3072017-04-05 16:50:35 -07003594#if IS_ENABLED(CONFIG_IPV6)
3595 struct ipv6_pinfo *np;
3596 struct ipv6_txoptions *optv6 = NULL;
3597#endif /* IS_ENABLED(CONFIG_IPV6) */
3598
3599 if (!sk)
3600 return overhead;
3601
R. Parameswaran113c3072017-04-05 16:50:35 -07003602 switch (sk->sk_family) {
3603 case AF_INET:
3604 inet = inet_sk(sk);
3605 overhead += sizeof(struct iphdr);
3606 opt = rcu_dereference_protected(inet->inet_opt,
stephen hemminger614d79c2017-07-24 10:25:22 -07003607 sock_owned_by_user(sk));
R. Parameswaran113c3072017-04-05 16:50:35 -07003608 if (opt)
3609 overhead += opt->opt.optlen;
3610 return overhead;
3611#if IS_ENABLED(CONFIG_IPV6)
3612 case AF_INET6:
3613 np = inet6_sk(sk);
3614 overhead += sizeof(struct ipv6hdr);
3615 if (np)
3616 optv6 = rcu_dereference_protected(np->opt,
stephen hemminger614d79c2017-07-24 10:25:22 -07003617 sock_owned_by_user(sk));
R. Parameswaran113c3072017-04-05 16:50:35 -07003618 if (optv6)
3619 overhead += (optv6->opt_flen + optv6->opt_nflen);
3620 return overhead;
3621#endif /* IS_ENABLED(CONFIG_IPV6) */
3622 default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */
3623 return overhead;
3624 }
3625}
3626EXPORT_SYMBOL(kernel_sock_ip_overhead);