blob: 3c10504e46d9267f1b885abb208493cfa6c2e9cd [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
Randy Dunlap85806af2019-05-18 21:23:07 -0700711/**
712 * sock_sendmsg - send a message through @sock
713 * @sock: socket
714 * @msg: message to send
715 *
716 * Sends @msg through @sock, passing through LSM.
717 * Returns the number of bytes sent, or an error code.
718 */
Al Virod8725c82014-12-11 00:02:50 -0500719int sock_sendmsg(struct socket *sock, struct msghdr *msg)
Gu Zheng0cf00c62014-12-05 15:14:23 +0800720{
Al Virod8725c82014-12-11 00:02:50 -0500721 int err = security_socket_sendmsg(sock, msg,
Al Viro01e97e62014-12-15 21:39:31 -0500722 msg_data_left(msg));
Ying Xue1b784142015-03-02 15:37:48 +0800723
Al Virod8725c82014-12-11 00:02:50 -0500724 return err ?: sock_sendmsg_nosec(sock, msg);
Gu Zheng0cf00c62014-12-05 15:14:23 +0800725}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700726EXPORT_SYMBOL(sock_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300728/**
729 * kernel_sendmsg - send a message through @sock (kernel-space)
730 * @sock: socket
731 * @msg: message header
732 * @vec: kernel vec
733 * @num: vec array length
734 * @size: total message data size
735 *
736 * Builds the message data with @vec and sends it through @sock.
737 * Returns the number of bytes sent, or an error code.
738 */
739
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
741 struct kvec *vec, size_t num, size_t size)
742{
David Howellsaa563d72018-10-20 00:57:56 +0100743 iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size);
Al Virod8725c82014-12-11 00:02:50 -0500744 return sock_sendmsg(sock, msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700746EXPORT_SYMBOL(kernel_sendmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300748/**
749 * kernel_sendmsg_locked - send a message through @sock (kernel-space)
750 * @sk: sock
751 * @msg: message header
752 * @vec: output s/g array
753 * @num: output s/g array length
754 * @size: total message data size
755 *
756 * Builds the message data with @vec and sends it through @sock.
757 * Returns the number of bytes sent, or an error code.
758 * Caller must hold @sk.
759 */
760
Tom Herbert306b13e2017-07-28 16:22:41 -0700761int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg,
762 struct kvec *vec, size_t num, size_t size)
763{
764 struct socket *sock = sk->sk_socket;
765
766 if (!sock->ops->sendmsg_locked)
John Fastabenddb5980d2017-08-15 22:31:34 -0700767 return sock_no_sendmsg_locked(sk, msg, size);
Tom Herbert306b13e2017-07-28 16:22:41 -0700768
David Howellsaa563d72018-10-20 00:57:56 +0100769 iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size);
Tom Herbert306b13e2017-07-28 16:22:41 -0700770
771 return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg));
772}
773EXPORT_SYMBOL(kernel_sendmsg_locked);
774
Soheil Hassas Yeganeh8605330a2017-03-18 17:02:59 -0400775static bool skb_is_err_queue(const struct sk_buff *skb)
776{
777 /* pkt_type of skbs enqueued on the error queue are set to
778 * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do
779 * in recvmsg, since skbs received on a local socket will never
780 * have a pkt_type of PACKET_OUTGOING.
781 */
782 return skb->pkt_type == PACKET_OUTGOING;
783}
784
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200785/* On transmit, software and hardware timestamps are returned independently.
786 * As the two skb clones share the hardware timestamp, which may be updated
787 * before the software timestamp is received, a hardware TX timestamp may be
788 * returned only if there is no software TX timestamp. Ignore false software
789 * timestamps, which may be made in the __sock_recv_timestamp() call when the
Deepa Dinamani7f1bc6e2019-02-02 07:34:46 -0800790 * option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200791 * hardware timestamp.
792 */
793static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp)
794{
795 return skb->tstamp && !false_tstamp && skb_is_err_queue(skb);
796}
797
Miroslav Lichvaraad9c8c2017-05-19 17:52:38 +0200798static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb)
799{
800 struct scm_ts_pktinfo ts_pktinfo;
801 struct net_device *orig_dev;
802
803 if (!skb_mac_header_was_set(skb))
804 return;
805
806 memset(&ts_pktinfo, 0, sizeof(ts_pktinfo));
807
808 rcu_read_lock();
809 orig_dev = dev_get_by_napi_id(skb_napi_id(skb));
810 if (orig_dev)
811 ts_pktinfo.if_index = orig_dev->ifindex;
812 rcu_read_unlock();
813
814 ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb);
815 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO,
816 sizeof(ts_pktinfo), &ts_pktinfo);
817}
818
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700819/*
820 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
821 */
822void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
823 struct sk_buff *skb)
824{
Patrick Ohly20d49472009-02-12 05:03:38 +0000825 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
Deepa Dinamani887feae2019-02-02 07:34:50 -0800826 int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW);
Deepa Dinamani97184752019-02-02 07:34:51 -0800827 struct scm_timestamping_internal tss;
828
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200829 int empty = 1, false_tstamp = 0;
Patrick Ohly20d49472009-02-12 05:03:38 +0000830 struct skb_shared_hwtstamps *shhwtstamps =
831 skb_hwtstamps(skb);
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700832
Patrick Ohly20d49472009-02-12 05:03:38 +0000833 /* Race occurred between timestamp enabling and packet
834 receiving. Fill in the current time for now. */
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200835 if (need_software_tstamp && skb->tstamp == 0) {
Patrick Ohly20d49472009-02-12 05:03:38 +0000836 __net_timestamp(skb);
Miroslav Lichvarb50a5c72017-05-19 17:52:40 +0200837 false_tstamp = 1;
838 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000839
840 if (need_software_tstamp) {
841 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
Deepa Dinamani887feae2019-02-02 07:34:50 -0800842 if (new_tstamp) {
843 struct __kernel_sock_timeval tv;
844
845 skb_get_new_timestamp(skb, &tv);
846 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW,
847 sizeof(tv), &tv);
848 } else {
849 struct __kernel_old_timeval tv;
850
851 skb_get_timestamp(skb, &tv);
852 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD,
853 sizeof(tv), &tv);
854 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000855 } else {
Deepa Dinamani887feae2019-02-02 07:34:50 -0800856 if (new_tstamp) {
857 struct __kernel_timespec ts;
858
859 skb_get_new_timestampns(skb, &ts);
860 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW,
861 sizeof(ts), &ts);
862 } else {
Arnd Bergmanndf1b4ba2019-10-25 22:04:46 +0200863 struct __kernel_old_timespec ts;
Deepa Dinamani887feae2019-02-02 07:34:50 -0800864
865 skb_get_timestampns(skb, &ts);
866 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD,
867 sizeof(ts), &ts);
868 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000869 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700870 }
Patrick Ohly20d49472009-02-12 05:03:38 +0000871
Willem de Bruijnf24b9be2014-08-04 22:11:45 -0400872 memset(&tss, 0, sizeof(tss));
Willem de Bruijnc1991052014-09-03 12:01:18 -0400873 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) &&
Deepa Dinamani97184752019-02-02 07:34:51 -0800874 ktime_to_timespec64_cond(skb->tstamp, tss.ts + 0))
Patrick Ohly20d49472009-02-12 05:03:38 +0000875 empty = 0;
Willem de Bruijn4d276eb2014-07-25 18:01:32 -0400876 if (shhwtstamps &&
Willem de Bruijnb9f40e22014-08-04 22:11:46 -0400877 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
Yangbo Lud7c08822021-06-30 16:12:00 +0800878 !skb_is_swtx_tstamp(skb, false_tstamp)) {
879 if (sk->sk_tsflags & SOF_TIMESTAMPING_BIND_PHC)
880 ptp_convert_timestamp(shhwtstamps, sk->sk_bind_phc);
881
882 if (ktime_to_timespec64_cond(shhwtstamps->hwtstamp,
883 tss.ts + 2)) {
884 empty = 0;
885
886 if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) &&
887 !skb_is_err_queue(skb))
888 put_ts_pktinfo(msg, skb);
889 }
Miroslav Lichvaraad9c8c2017-05-19 17:52:38 +0200890 }
Francis Yan1c885802016-11-27 23:07:18 -0800891 if (!empty) {
Deepa Dinamani97184752019-02-02 07:34:51 -0800892 if (sock_flag(sk, SOCK_TSTAMP_NEW))
893 put_cmsg_scm_timestamping64(msg, &tss);
894 else
895 put_cmsg_scm_timestamping(msg, &tss);
Francis Yan1c885802016-11-27 23:07:18 -0800896
Soheil Hassas Yeganeh8605330a2017-03-18 17:02:59 -0400897 if (skb_is_err_queue(skb) && skb->len &&
Soheil Hassas Yeganeh4ef1b282017-03-18 17:03:00 -0400898 SKB_EXT_ERR(skb)->opt_stats)
Francis Yan1c885802016-11-27 23:07:18 -0800899 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS,
900 skb->len, skb->data);
901 }
Eric Dumazet92f37fd2007-03-25 22:14:49 -0700902}
Arnaldo Carvalho de Melo7c81fd82007-03-10 00:39:35 -0300903EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
904
Johannes Berg6e3e9392011-11-09 10:15:42 +0100905void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
906 struct sk_buff *skb)
907{
908 int ack;
909
910 if (!sock_flag(sk, SOCK_WIFI_STATUS))
911 return;
912 if (!skb->wifi_acked_valid)
913 return;
914
915 ack = skb->wifi_acked;
916
917 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
918}
919EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
920
stephen hemminger11165f12010-10-18 14:27:29 +0000921static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
922 struct sk_buff *skb)
Neil Horman3b885782009-10-12 13:26:31 -0700923{
Eyal Birger744d5a32015-03-01 14:58:31 +0200924 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount)
Neil Horman3b885782009-10-12 13:26:31 -0700925 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
Eyal Birger744d5a32015-03-01 14:58:31 +0200926 sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount);
Neil Horman3b885782009-10-12 13:26:31 -0700927}
928
Eric Dumazet767dd032010-04-28 19:14:43 +0000929void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
Neil Horman3b885782009-10-12 13:26:31 -0700930 struct sk_buff *skb)
931{
932 sock_recv_timestamp(msg, sk, skb);
933 sock_recv_drops(msg, sk, skb);
934}
Eric Dumazet767dd032010-04-28 19:14:43 +0000935EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
Neil Horman3b885782009-10-12 13:26:31 -0700936
Paolo Abeni8c3c4472019-05-03 17:01:39 +0200937INDIRECT_CALLABLE_DECLARE(int inet_recvmsg(struct socket *, struct msghdr *,
Paolo Abenia648a592019-07-03 16:06:54 +0200938 size_t, int));
939INDIRECT_CALLABLE_DECLARE(int inet6_recvmsg(struct socket *, struct msghdr *,
940 size_t, int));
Ying Xue1b784142015-03-02 15:37:48 +0800941static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
Al Viro2da62902015-03-14 21:13:46 -0400942 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943{
Paolo Abenia648a592019-07-03 16:06:54 +0200944 return INDIRECT_CALL_INET(sock->ops->recvmsg, inet6_recvmsg,
945 inet_recvmsg, sock, msg, msg_data_left(msg),
946 flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947}
948
Randy Dunlap85806af2019-05-18 21:23:07 -0700949/**
950 * sock_recvmsg - receive a message from @sock
951 * @sock: socket
952 * @msg: message to receive
953 * @flags: message flags
954 *
955 * Receives @msg from @sock, passing through LSM. Returns the total number
956 * of bytes received, or an error.
957 */
Al Viro2da62902015-03-14 21:13:46 -0400958int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700959{
Al Viro2da62902015-03-14 21:13:46 -0400960 int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -0700961
Al Viro2da62902015-03-14 21:13:46 -0400962 return err ?: sock_recvmsg_nosec(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700964EXPORT_SYMBOL(sock_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965
Martin Lucinac1249c0a2010-12-10 00:04:05 +0000966/**
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300967 * kernel_recvmsg - Receive a message from a socket (kernel space)
968 * @sock: The socket to receive the message from
969 * @msg: Received message
970 * @vec: Input s/g array for message data
971 * @num: Size of input s/g array
972 * @size: Number of bytes to read
973 * @flags: Message flags (MSG_DONTWAIT, etc...)
Martin Lucinac1249c0a2010-12-10 00:04:05 +0000974 *
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300975 * On return the msg structure contains the scatter/gather array passed in the
976 * vec argument. The array is modified so that it consists of the unfilled
977 * portion of the original array.
Martin Lucinac1249c0a2010-12-10 00:04:05 +0000978 *
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300979 * The returned value is the total number of bytes received, or an error.
Martin Lucinac1249c0a2010-12-10 00:04:05 +0000980 */
Pedro Tammela8a3c2452019-03-14 10:45:23 -0300981
Stephen Hemminger89bddce2006-09-01 00:19:31 -0700982int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
983 struct kvec *vec, size_t num, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984{
Christoph Hellwig1f466e12020-05-11 13:59:13 +0200985 msg->msg_control_is_user = false;
David Howellsaa563d72018-10-20 00:57:56 +0100986 iov_iter_kvec(&msg->msg_iter, READ, vec, num, size);
Christoph Hellwig1f466e12020-05-11 13:59:13 +0200987 return sock_recvmsg(sock, msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988}
Eric Dumazetc6d409c2010-06-03 20:03:40 -0700989EXPORT_SYMBOL(kernel_recvmsg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300991static ssize_t sock_sendpage(struct file *file, struct page *page,
992 int offset, size_t size, loff_t *ppos, int more)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993{
994 struct socket *sock;
995 int flags;
996
Eric Dumazetb69aee02005-09-06 14:42:45 -0700997 sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998
Eric Dumazet35f9c092012-04-05 03:05:35 +0000999 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
1000 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
1001 flags |= more;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002
Linus Torvaldse6949582009-08-13 08:28:36 -07001003 return kernel_sendpage(sock, page, offset, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004}
1005
Jens Axboe9c55e012007-11-06 23:30:13 -08001006static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001007 struct pipe_inode_info *pipe, size_t len,
Jens Axboe9c55e012007-11-06 23:30:13 -08001008 unsigned int flags)
1009{
1010 struct socket *sock = file->private_data;
1011
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -08001012 if (unlikely(!sock->ops->splice_read))
Slavomir Kaslev95506582018-11-16 11:27:53 +02001013 return generic_file_splice_read(file, ppos, pipe, len, flags);
Rémi Denis-Courmont997b37d2008-02-15 02:35:45 -08001014
Jens Axboe9c55e012007-11-06 23:30:13 -08001015 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
1016}
1017
Al Viro8ae5e0302014-11-28 19:40:50 -05001018static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -08001019{
Al Viro6d652332015-01-30 16:12:56 -05001020 struct file *file = iocb->ki_filp;
1021 struct socket *sock = file->private_data;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -07001022 struct msghdr msg = {.msg_iter = *to,
1023 .msg_iocb = iocb};
Al Viro8ae5e0302014-11-28 19:40:50 -05001024 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -08001025
Jens Axboeebfcd892019-12-09 20:58:56 -07001026 if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT))
Al Viro8ae5e0302014-11-28 19:40:50 -05001027 msg.msg_flags = MSG_DONTWAIT;
1028
1029 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -08001030 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -07001031
Christoph Hellwig66ee59a2015-02-11 19:56:46 +01001032 if (!iov_iter_count(to)) /* Match SYS5 behaviour */
Christoph Hellwigce1d4d32005-12-22 21:08:46 -08001033 return 0;
1034
Al Viro2da62902015-03-14 21:13:46 -04001035 res = sock_recvmsg(sock, &msg, msg.msg_flags);
Al Viro8ae5e0302014-11-28 19:40:50 -05001036 *to = msg.msg_iter;
1037 return res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -08001038}
1039
Al Viro8ae5e0302014-11-28 19:40:50 -05001040static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041{
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 = *from,
1045 .msg_iocb = iocb};
Al Viro8ae5e0302014-11-28 19:40:50 -05001046 ssize_t res;
Christoph Hellwigce1d4d32005-12-22 21:08:46 -08001047
Al Viro8ae5e0302014-11-28 19:40:50 -05001048 if (iocb->ki_pos != 0)
Christoph Hellwigce1d4d32005-12-22 21:08:46 -08001049 return -ESPIPE;
Badari Pulavarty027445c2006-09-30 23:28:46 -07001050
Jens Axboeebfcd892019-12-09 20:58:56 -07001051 if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT))
Al Viro8ae5e0302014-11-28 19:40:50 -05001052 msg.msg_flags = MSG_DONTWAIT;
1053
Al Viro6d652332015-01-30 16:12:56 -05001054 if (sock->type == SOCK_SEQPACKET)
1055 msg.msg_flags |= MSG_EOR;
1056
Al Virod8725c82014-12-11 00:02:50 -05001057 res = sock_sendmsg(sock, &msg);
Al Viro8ae5e0302014-11-28 19:40:50 -05001058 *from = msg.msg_iter;
1059 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060}
1061
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062/*
1063 * Atomic setting of ioctl hooks to avoid race
1064 * with module unload.
1065 */
1066
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001067static DEFINE_MUTEX(br_ioctl_mutex);
Arnd Bergmannad2f99a2021-07-27 15:45:16 +02001068static int (*br_ioctl_hook)(struct net *net, struct net_bridge *br,
1069 unsigned int cmd, struct ifreq *ifr,
1070 void __user *uarg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071
Arnd Bergmannad2f99a2021-07-27 15:45:16 +02001072void brioctl_set(int (*hook)(struct net *net, struct net_bridge *br,
1073 unsigned int cmd, struct ifreq *ifr,
1074 void __user *uarg))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001076 mutex_lock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 br_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001078 mutex_unlock(&br_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079}
1080EXPORT_SYMBOL(brioctl_set);
1081
Arnd Bergmannad2f99a2021-07-27 15:45:16 +02001082int br_ioctl_call(struct net *net, struct net_bridge *br, unsigned int cmd,
1083 struct ifreq *ifr, void __user *uarg)
1084{
1085 int err = -ENOPKG;
1086
1087 if (!br_ioctl_hook)
1088 request_module("bridge");
1089
1090 mutex_lock(&br_ioctl_mutex);
1091 if (br_ioctl_hook)
1092 err = br_ioctl_hook(net, br, cmd, ifr, uarg);
1093 mutex_unlock(&br_ioctl_mutex);
1094
1095 return err;
1096}
1097
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001098static DEFINE_MUTEX(vlan_ioctl_mutex);
Eric W. Biederman881d9662007-09-17 11:56:21 -07001099static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100
Eric W. Biederman881d9662007-09-17 11:56:21 -07001101void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102{
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001103 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 vlan_ioctl_hook = hook;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001105 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106}
1107EXPORT_SYMBOL(vlan_ioctl_set);
1108
Arnd Bergmann6b960182009-11-06 23:10:54 -08001109static long sock_do_ioctl(struct net *net, struct socket *sock,
Johannes Berg63ff03a2019-01-25 22:43:17 +01001110 unsigned int cmd, unsigned long arg)
Arnd Bergmann6b960182009-11-06 23:10:54 -08001111{
Arnd Bergmann876f0bf2021-07-22 16:29:02 +02001112 struct ifreq ifr;
1113 bool need_copyout;
Arnd Bergmann6b960182009-11-06 23:10:54 -08001114 int err;
1115 void __user *argp = (void __user *)arg;
Arnd Bergmanna554bf92021-07-27 15:45:12 +02001116 void __user *data;
Arnd Bergmann6b960182009-11-06 23:10:54 -08001117
1118 err = sock->ops->ioctl(sock, cmd, arg);
1119
1120 /*
1121 * If this ioctl is unknown try to hand it down
1122 * to the NIC driver.
1123 */
Al Viro36fd6332017-06-26 13:19:16 -04001124 if (err != -ENOIOCTLCMD)
1125 return err;
Arnd Bergmann6b960182009-11-06 23:10:54 -08001126
Arnd Bergmanna554bf92021-07-27 15:45:12 +02001127 if (get_user_ifreq(&ifr, &data, argp))
Arnd Bergmann876f0bf2021-07-22 16:29:02 +02001128 return -EFAULT;
Arnd Bergmanna554bf92021-07-27 15:45:12 +02001129 err = dev_ioctl(net, cmd, &ifr, data, &need_copyout);
Arnd Bergmann876f0bf2021-07-22 16:29:02 +02001130 if (!err && need_copyout)
Arnd Bergmanna554bf92021-07-27 15:45:12 +02001131 if (put_user_ifreq(&ifr, argp))
Al Viro36fd6332017-06-26 13:19:16 -04001132 return -EFAULT;
Arnd Bergmann876f0bf2021-07-22 16:29:02 +02001133
Arnd Bergmann6b960182009-11-06 23:10:54 -08001134 return err;
1135}
1136
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137/*
1138 * With an ioctl, arg may well be a user mode pointer, but we don't know
1139 * what to do with it - that's up to the protocol still.
1140 */
1141
1142static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
1143{
1144 struct socket *sock;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001145 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 void __user *argp = (void __user *)arg;
1147 int pid, err;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001148 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149
Eric Dumazetb69aee02005-09-06 14:42:45 -07001150 sock = file->private_data;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001151 sk = sock->sk;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001152 net = sock_net(sk);
Al Viro44c02a22017-10-05 12:59:44 -04001153 if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) {
1154 struct ifreq ifr;
Arnd Bergmanna554bf92021-07-27 15:45:12 +02001155 void __user *data;
Al Viro44c02a22017-10-05 12:59:44 -04001156 bool need_copyout;
Arnd Bergmanna554bf92021-07-27 15:45:12 +02001157 if (get_user_ifreq(&ifr, &data, argp))
Al Viro44c02a22017-10-05 12:59:44 -04001158 return -EFAULT;
Arnd Bergmanna554bf92021-07-27 15:45:12 +02001159 err = dev_ioctl(net, cmd, &ifr, data, &need_copyout);
Al Viro44c02a22017-10-05 12:59:44 -04001160 if (!err && need_copyout)
Arnd Bergmanna554bf92021-07-27 15:45:12 +02001161 if (put_user_ifreq(&ifr, argp))
Al Viro44c02a22017-10-05 12:59:44 -04001162 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001164#ifdef CONFIG_WEXT_CORE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
Al Virob1b0c242017-10-01 20:13:08 -04001166 err = wext_handle_ioctl(net, cmd, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 } else
Johannes Berg3d23e342009-09-29 23:27:28 +02001168#endif
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001169 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 case FIOSETOWN:
1171 case SIOCSPGRP:
1172 err = -EFAULT;
1173 if (get_user(pid, (int __user *)argp))
1174 break;
Jiri Slaby393cc3f2017-06-13 13:35:50 +02001175 err = f_setown(sock->file, pid, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176 break;
1177 case FIOGETOWN:
1178 case SIOCGPGRP:
Eric W. Biederman609d7fa2006-10-02 02:17:15 -07001179 err = put_user(f_getown(sock->file),
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001180 (int __user *)argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 break;
1182 case SIOCGIFBR:
1183 case SIOCSIFBR:
1184 case SIOCBRADDBR:
1185 case SIOCBRDELBR:
Arnd Bergmannad2f99a2021-07-27 15:45:16 +02001186 err = br_ioctl_call(net, NULL, cmd, NULL, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 break;
1188 case SIOCGIFVLAN:
1189 case SIOCSIFVLAN:
1190 err = -ENOPKG;
1191 if (!vlan_ioctl_hook)
1192 request_module("8021q");
1193
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001194 mutex_lock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195 if (vlan_ioctl_hook)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001196 err = vlan_ioctl_hook(net, argp);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08001197 mutex_unlock(&vlan_ioctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198 break;
Andrey Vaginc62cce22016-10-24 18:29:13 -07001199 case SIOCGSKNS:
1200 err = -EPERM;
1201 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1202 break;
1203
1204 err = open_related_ns(&net->ns, get_net_ns);
1205 break;
Arnd Bergmann0768e172019-04-17 22:56:11 +02001206 case SIOCGSTAMP_OLD:
1207 case SIOCGSTAMPNS_OLD:
Arnd Bergmannc7cbdbf2019-04-17 22:51:48 +02001208 if (!sock->ops->gettstamp) {
1209 err = -ENOIOCTLCMD;
1210 break;
1211 }
1212 err = sock->ops->gettstamp(sock, argp,
Arnd Bergmann0768e172019-04-17 22:56:11 +02001213 cmd == SIOCGSTAMP_OLD,
1214 !IS_ENABLED(CONFIG_64BIT));
Gustavo A. R. Silva60747822019-04-24 10:31:24 -05001215 break;
Arnd Bergmann0768e172019-04-17 22:56:11 +02001216 case SIOCGSTAMP_NEW:
1217 case SIOCGSTAMPNS_NEW:
1218 if (!sock->ops->gettstamp) {
1219 err = -ENOIOCTLCMD;
1220 break;
1221 }
1222 err = sock->ops->gettstamp(sock, argp,
1223 cmd == SIOCGSTAMP_NEW,
1224 false);
Arnd Bergmannc7cbdbf2019-04-17 22:51:48 +02001225 break;
Arnd Bergmann876f0bf2021-07-22 16:29:02 +02001226
1227 case SIOCGIFCONF:
1228 err = dev_ifconf(net, argp);
1229 break;
1230
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231 default:
Johannes Berg63ff03a2019-01-25 22:43:17 +01001232 err = sock_do_ioctl(net, sock, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001234 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 return err;
1236}
1237
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001238/**
1239 * sock_create_lite - creates a socket
1240 * @family: protocol family (AF_INET, ...)
1241 * @type: communication type (SOCK_STREAM, ...)
1242 * @protocol: protocol (0, ...)
1243 * @res: new socket
1244 *
1245 * Creates a new socket and assigns it to @res, passing through LSM.
1246 * The new socket initialization is not complete, see kernel_accept().
1247 * Returns 0 or an error. On failure @res is set to %NULL.
1248 * This function internally uses GFP_KERNEL.
1249 */
1250
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251int sock_create_lite(int family, int type, int protocol, struct socket **res)
1252{
1253 int err;
1254 struct socket *sock = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001255
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256 err = security_socket_create(family, type, protocol, 1);
1257 if (err)
1258 goto out;
1259
1260 sock = sock_alloc();
1261 if (!sock) {
1262 err = -ENOMEM;
1263 goto out;
1264 }
1265
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 sock->type = type;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001267 err = security_socket_post_create(sock, family, type, protocol, 1);
1268 if (err)
1269 goto out_release;
1270
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271out:
1272 *res = sock;
1273 return err;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001274out_release:
1275 sock_release(sock);
1276 sock = NULL;
1277 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001279EXPORT_SYMBOL(sock_create_lite);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280
1281/* No kernel lock held - perfect */
Al Viroade994f2017-07-03 00:01:49 -04001282static __poll_t sock_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283{
Christoph Hellwig3cafb372018-01-09 16:07:34 +01001284 struct socket *sock = file->private_data;
Christoph Hellwiga331de32018-07-30 09:42:13 +02001285 __poll_t events = poll_requested_events(wait), flag = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286
Christoph Hellwige88958e2018-06-29 15:37:24 +02001287 if (!sock->ops->poll)
1288 return 0;
Christoph Hellwigf641f13b2018-07-30 09:42:12 +02001289
Christoph Hellwiga331de32018-07-30 09:42:13 +02001290 if (sk_can_busy_loop(sock->sk)) {
1291 /* poll once if requested by the syscall */
1292 if (events & POLL_BUSY_LOOP)
1293 sk_busy_loop(sock->sk, 1);
1294
1295 /* if this socket can poll_ll, tell the system call */
1296 flag = POLL_BUSY_LOOP;
1297 }
1298
1299 return sock->ops->poll(file, sock, wait) | flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300}
1301
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001302static int sock_mmap(struct file *file, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303{
Eric Dumazetb69aee02005-09-06 14:42:45 -07001304 struct socket *sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305
1306 return sock->ops->mmap(file, sock, vma);
1307}
1308
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -03001309static int sock_close(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310{
Cong Wang6d8c50d2018-06-07 13:39:49 -07001311 __sock_release(SOCKET_I(inode), inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 return 0;
1313}
1314
1315/*
1316 * Update the socket async list
1317 *
1318 * Fasync_list locking strategy.
1319 *
1320 * 1. fasync_list is modified only under process context socket lock
1321 * i.e. under semaphore.
1322 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
Eric Dumazet989a2972010-04-14 09:55:35 +00001323 * or under socket lock
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324 */
1325
1326static int sock_fasync(int fd, struct file *filp, int on)
1327{
Eric Dumazet989a2972010-04-14 09:55:35 +00001328 struct socket *sock = filp->private_data;
1329 struct sock *sk = sock->sk;
Al Viro333f7902019-07-05 20:14:16 +01001330 struct socket_wq *wq = &sock->wq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331
Eric Dumazet989a2972010-04-14 09:55:35 +00001332 if (sk == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334
1335 lock_sock(sk);
Eric Dumazeteaefd1102011-02-18 03:26:36 +00001336 fasync_helper(fd, filp, on, &wq->fasync_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337
Eric Dumazeteaefd1102011-02-18 03:26:36 +00001338 if (!wq->fasync_list)
Eric Dumazet989a2972010-04-14 09:55:35 +00001339 sock_reset_flag(sk, SOCK_FASYNC);
Jonathan Corbet76398422009-02-01 14:26:59 -07001340 else
Eric Dumazetbcdce712009-10-06 17:28:29 -07001341 sock_set_flag(sk, SOCK_FASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342
Eric Dumazet989a2972010-04-14 09:55:35 +00001343 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 return 0;
1345}
1346
Eric Dumazetceb5d582015-11-29 20:03:11 -08001347/* This function may be called only under rcu_lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348
Eric Dumazetceb5d582015-11-29 20:03:11 -08001349int sock_wake_async(struct socket_wq *wq, int how, int band)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350{
Eric Dumazetceb5d582015-11-29 20:03:11 -08001351 if (!wq || !wq->fasync_list)
1352 return -1;
Eric Dumazet43815482010-04-29 11:01:49 +00001353
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001354 switch (how) {
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001355 case SOCK_WAKE_WAITD:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001356 if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357 break;
1358 goto call_kill;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001359 case SOCK_WAKE_SPACE:
Eric Dumazetceb5d582015-11-29 20:03:11 -08001360 if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361 break;
Miaohe Lin7c7ab582020-08-08 16:23:10 +08001362 fallthrough;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001363 case SOCK_WAKE_IO:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001364call_kill:
Eric Dumazet43815482010-04-29 11:01:49 +00001365 kill_fasync(&wq->fasync_list, SIGIO, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366 break;
Pavel Emelyanov8d8ad9d2007-11-26 20:10:50 +08001367 case SOCK_WAKE_URG:
Eric Dumazet43815482010-04-29 11:01:49 +00001368 kill_fasync(&wq->fasync_list, SIGURG, band);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 }
Eric Dumazetceb5d582015-11-29 20:03:11 -08001370
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 return 0;
1372}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001373EXPORT_SYMBOL(sock_wake_async);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001375/**
1376 * __sock_create - creates a socket
1377 * @net: net namespace
1378 * @family: protocol family (AF_INET, ...)
1379 * @type: communication type (SOCK_STREAM, ...)
1380 * @protocol: protocol (0, ...)
1381 * @res: new socket
1382 * @kern: boolean for kernel space sockets
1383 *
1384 * Creates a new socket and assigns it to @res, passing through LSM.
1385 * Returns 0 or an error. On failure @res is set to %NULL. @kern must
1386 * be set to true if the socket resides in kernel space.
1387 * This function internally uses GFP_KERNEL.
1388 */
1389
Pavel Emelyanov721db932010-09-29 16:06:32 +04001390int __sock_create(struct net *net, int family, int type, int protocol,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001391 struct socket **res, int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392{
1393 int err;
1394 struct socket *sock;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001395 const struct net_proto_family *pf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396
1397 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001398 * Check protocol is in range
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399 */
1400 if (family < 0 || family >= NPROTO)
1401 return -EAFNOSUPPORT;
1402 if (type < 0 || type >= SOCK_MAX)
1403 return -EINVAL;
1404
1405 /* Compatibility.
1406
1407 This uglymoron is moved from INET layer to here to avoid
1408 deadlock in module load.
1409 */
1410 if (family == PF_INET && type == SOCK_PACKET) {
liping.zhangf3c98692016-03-11 23:08:36 +08001411 pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1412 current->comm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413 family = PF_PACKET;
1414 }
1415
1416 err = security_socket_create(family, type, protocol, kern);
1417 if (err)
1418 return err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001419
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001420 /*
1421 * Allocate the socket and allow the family to set things up. if
1422 * the protocol is 0, the family is instructed to select an appropriate
1423 * default.
1424 */
1425 sock = sock_alloc();
1426 if (!sock) {
Joe Perchese87cc472012-05-13 21:56:26 +00001427 net_warn_ratelimited("socket: no more sockets\n");
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001428 return -ENFILE; /* Not exactly a match, but its the
1429 closest posix thing */
1430 }
1431
1432 sock->type = type;
1433
Johannes Berg95a5afc2008-10-16 15:24:51 -07001434#ifdef CONFIG_MODULES
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001435 /* Attempt to load a protocol module if the find failed.
1436 *
1437 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438 * requested real, full-featured networking support upon configuration.
1439 * Otherwise module support will break!
1440 */
Eric Dumazet190683a2010-11-10 10:50:44 +00001441 if (rcu_access_pointer(net_families[family]) == NULL)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001442 request_module("net-pf-%d", family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443#endif
1444
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001445 rcu_read_lock();
1446 pf = rcu_dereference(net_families[family]);
1447 err = -EAFNOSUPPORT;
1448 if (!pf)
1449 goto out_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450
1451 /*
1452 * We will call the ->create function, that possibly is in a loadable
1453 * module, so we have to bump that loadable module refcnt first.
1454 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001455 if (!try_module_get(pf->owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456 goto out_release;
1457
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001458 /* Now protected by module ref count */
1459 rcu_read_unlock();
1460
Eric Paris3f378b62009-11-05 22:18:14 -08001461 err = pf->create(net, sock, protocol, kern);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001462 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463 goto out_module_put;
Frank Filza79af592005-09-27 15:23:38 -07001464
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465 /*
1466 * Now to bump the refcnt of the [loadable] module that owns this
1467 * socket at sock_release time we decrement its refcnt.
1468 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001469 if (!try_module_get(sock->ops->owner))
1470 goto out_module_busy;
1471
Linus Torvalds1da177e2005-04-16 15:20:36 -07001472 /*
1473 * Now that we're done with the ->create function, the [loadable]
1474 * module can have its refcnt decremented
1475 */
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001476 module_put(pf->owner);
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07001477 err = security_socket_post_create(sock, family, type, protocol, kern);
1478 if (err)
Herbert Xu3b185522007-08-15 14:46:02 -07001479 goto out_sock_release;
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001480 *res = sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001482 return 0;
1483
1484out_module_busy:
1485 err = -EAFNOSUPPORT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486out_module_put:
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001487 sock->ops = NULL;
1488 module_put(pf->owner);
1489out_sock_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490 sock_release(sock);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07001491 return err;
1492
1493out_release:
1494 rcu_read_unlock();
1495 goto out_sock_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496}
Pavel Emelyanov721db932010-09-29 16:06:32 +04001497EXPORT_SYMBOL(__sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001499/**
1500 * sock_create - creates a socket
1501 * @family: protocol family (AF_INET, ...)
1502 * @type: communication type (SOCK_STREAM, ...)
1503 * @protocol: protocol (0, ...)
1504 * @res: new socket
1505 *
1506 * A wrapper around __sock_create().
1507 * Returns 0 or an error. This function internally uses GFP_KERNEL.
1508 */
1509
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510int sock_create(int family, int type, int protocol, struct socket **res)
1511{
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001512 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001514EXPORT_SYMBOL(sock_create);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001515
Pedro Tammela8a3c2452019-03-14 10:45:23 -03001516/**
1517 * sock_create_kern - creates a socket (kernel space)
1518 * @net: net namespace
1519 * @family: protocol family (AF_INET, ...)
1520 * @type: communication type (SOCK_STREAM, ...)
1521 * @protocol: protocol (0, ...)
1522 * @res: new socket
1523 *
1524 * A wrapper around __sock_create().
1525 * Returns 0 or an error. This function internally uses GFP_KERNEL.
1526 */
1527
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001528int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529{
Eric W. Biedermaneeb1bd52015-05-08 21:08:05 -05001530 return __sock_create(net, family, type, protocol, res, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001532EXPORT_SYMBOL(sock_create_kern);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01001534int __sys_socket(int family, int type, int protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535{
1536 int retval;
1537 struct socket *sock;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001538 int flags;
1539
Ulrich Dreppere38b36f2008-07-23 21:29:42 -07001540 /* Check the SOCK_* constants for consistency. */
1541 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1542 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1543 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1544 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1545
Ulrich Dreppera677a032008-07-23 21:29:17 -07001546 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001547 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001548 return -EINVAL;
1549 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001551 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1552 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1553
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554 retval = sock_create(family, type, protocol, &sock);
1555 if (retval < 0)
Al Viro8e1611e2017-12-05 23:29:09 +00001556 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001557
Al Viro8e1611e2017-12-05 23:29:09 +00001558 return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001559}
1560
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01001561SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
1562{
1563 return __sys_socket(family, type, protocol);
1564}
1565
Linus Torvalds1da177e2005-04-16 15:20:36 -07001566/*
1567 * Create a pair of connected sockets.
1568 */
1569
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01001570int __sys_socketpair(int family, int type, int protocol, int __user *usockvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001571{
1572 struct socket *sock1, *sock2;
1573 int fd1, fd2, err;
Al Virodb349502007-02-07 01:48:00 -05001574 struct file *newfile1, *newfile2;
Ulrich Dreppera677a032008-07-23 21:29:17 -07001575 int flags;
1576
1577 flags = type & ~SOCK_TYPE_MASK;
Ulrich Drepper77d27202008-07-23 21:29:35 -07001578 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Dreppera677a032008-07-23 21:29:17 -07001579 return -EINVAL;
1580 type &= SOCK_TYPE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001582 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1583 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1584
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585 /*
Al Viro016a2662017-12-05 23:28:38 +00001586 * reserve descriptors and make sure we won't fail
1587 * to return them to userland.
1588 */
1589 fd1 = get_unused_fd_flags(flags);
1590 if (unlikely(fd1 < 0))
1591 return fd1;
1592
1593 fd2 = get_unused_fd_flags(flags);
1594 if (unlikely(fd2 < 0)) {
1595 put_unused_fd(fd1);
1596 return fd2;
1597 }
1598
1599 err = put_user(fd1, &usockvec[0]);
1600 if (err)
1601 goto out;
1602
1603 err = put_user(fd2, &usockvec[1]);
1604 if (err)
1605 goto out;
1606
1607 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001608 * Obtain the first socket and check if the underlying protocol
1609 * supports the socketpair call.
1610 */
1611
1612 err = sock_create(family, type, protocol, &sock1);
Al Viro016a2662017-12-05 23:28:38 +00001613 if (unlikely(err < 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614 goto out;
1615
1616 err = sock_create(family, type, protocol, &sock2);
Al Viro016a2662017-12-05 23:28:38 +00001617 if (unlikely(err < 0)) {
1618 sock_release(sock1);
1619 goto out;
David S. Millerbf3c23d2007-10-29 21:54:02 -07001620 }
Yann Droneaudd73aa282013-12-09 22:42:20 +01001621
David Herrmannd47cd942018-05-04 16:28:20 +02001622 err = security_socket_socketpair(sock1, sock2);
1623 if (unlikely(err)) {
1624 sock_release(sock2);
1625 sock_release(sock1);
1626 goto out;
1627 }
1628
Al Viro016a2662017-12-05 23:28:38 +00001629 err = sock1->ops->socketpair(sock1, sock2);
1630 if (unlikely(err < 0)) {
1631 sock_release(sock2);
1632 sock_release(sock1);
1633 goto out;
Al Viro28407632012-08-17 23:54:15 -04001634 }
1635
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001636 newfile1 = sock_alloc_file(sock1, flags, NULL);
Viresh Kumarb5ffe632015-08-12 15:59:47 +05301637 if (IS_ERR(newfile1)) {
Al Viro28407632012-08-17 23:54:15 -04001638 err = PTR_ERR(newfile1);
Al Viro016a2662017-12-05 23:28:38 +00001639 sock_release(sock2);
1640 goto out;
Al Viro28407632012-08-17 23:54:15 -04001641 }
1642
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001643 newfile2 = sock_alloc_file(sock2, flags, NULL);
Al Viro28407632012-08-17 23:54:15 -04001644 if (IS_ERR(newfile2)) {
1645 err = PTR_ERR(newfile2);
Al Viro016a2662017-12-05 23:28:38 +00001646 fput(newfile1);
1647 goto out;
Al Virodb349502007-02-07 01:48:00 -05001648 }
1649
Al Viro157cf642008-12-14 04:57:47 -05001650 audit_fd_pair(fd1, fd2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001651
Al Virodb349502007-02-07 01:48:00 -05001652 fd_install(fd1, newfile1);
1653 fd_install(fd2, newfile2);
Yann Droneaudd73aa282013-12-09 22:42:20 +01001654 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656out:
Al Viro016a2662017-12-05 23:28:38 +00001657 put_unused_fd(fd2);
1658 put_unused_fd(fd1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001659 return err;
1660}
1661
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01001662SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1663 int __user *, usockvec)
1664{
1665 return __sys_socketpair(family, type, protocol, usockvec);
1666}
1667
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668/*
1669 * Bind a name to a socket. Nothing much to do here since it's
1670 * the protocol's responsibility to handle the local address.
1671 *
1672 * We move the socket address to kernel space before we call
1673 * the protocol layer (having also checked the address is ok).
1674 */
1675
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01001676int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001677{
1678 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001679 struct sockaddr_storage address;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001680 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001682 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Stephen Hemmingere71a4782007-04-10 20:10:33 -07001683 if (sock) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001684 err = move_addr_to_kernel(umyaddr, addrlen, &address);
Jakub Sitnicki068b88c2018-10-04 11:09:40 +02001685 if (!err) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001686 err = security_socket_bind(sock,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001687 (struct sockaddr *)&address,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001688 addrlen);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001689 if (!err)
1690 err = sock->ops->bind(sock,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001691 (struct sockaddr *)
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001692 &address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693 }
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001694 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001695 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001696 return err;
1697}
1698
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01001699SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
1700{
1701 return __sys_bind(fd, umyaddr, addrlen);
1702}
1703
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704/*
1705 * Perform a listen. Basically, we allow the protocol to do anything
1706 * necessary for a listen, and if that works, we mark the socket as
1707 * ready for listening.
1708 */
1709
Dominik Brodowski25e290e2018-03-13 19:36:54 +01001710int __sys_listen(int fd, int backlog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001711{
1712 struct socket *sock;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001713 int err, fput_needed;
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001714 int somaxconn;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001715
1716 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1717 if (sock) {
Pavel Emelyanov8efa6e92008-03-31 19:41:14 -07001718 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
Eric Dumazet95c96172012-04-15 05:58:06 +00001719 if ((unsigned int)backlog > somaxconn)
Pavel Emelyanovb8e1f9b2007-12-08 00:12:33 -08001720 backlog = somaxconn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001721
1722 err = security_socket_listen(sock, backlog);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001723 if (!err)
1724 err = sock->ops->listen(sock, backlog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001726 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001727 }
1728 return err;
1729}
1730
Dominik Brodowski25e290e2018-03-13 19:36:54 +01001731SYSCALL_DEFINE2(listen, int, fd, int, backlog)
1732{
1733 return __sys_listen(fd, backlog);
1734}
1735
Jens Axboede2ea4b2019-10-17 14:41:29 -06001736int __sys_accept4_file(struct file *file, unsigned file_flags,
1737 struct sockaddr __user *upeer_sockaddr,
Jens Axboe09952e32020-03-19 20:16:56 -06001738 int __user *upeer_addrlen, int flags,
1739 unsigned long nofile)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001740{
1741 struct socket *sock, *newsock;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001742 struct file *newfile;
Jens Axboede2ea4b2019-10-17 14:41:29 -06001743 int err, len, newfd;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001744 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001745
Ulrich Drepper77d27202008-07-23 21:29:35 -07001746 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001747 return -EINVAL;
1748
1749 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1750 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1751
Florent Revestdba4a922020-12-04 12:36:04 +01001752 sock = sock_from_file(file);
1753 if (!sock) {
1754 err = -ENOTSOCK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001755 goto out;
Florent Revestdba4a922020-12-04 12:36:04 +01001756 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001757
1758 err = -ENFILE;
Eric Dumazetc6d409c2010-06-03 20:03:40 -07001759 newsock = sock_alloc();
1760 if (!newsock)
Jens Axboede2ea4b2019-10-17 14:41:29 -06001761 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001762
1763 newsock->type = sock->type;
1764 newsock->ops = sock->ops;
1765
Linus Torvalds1da177e2005-04-16 15:20:36 -07001766 /*
1767 * We don't need try_module_get here, as the listening socket (sock)
1768 * has the protocol module (sock->ops->owner) held.
1769 */
1770 __module_get(newsock->ops->owner);
1771
Jens Axboe09952e32020-03-19 20:16:56 -06001772 newfd = __get_unused_fd_flags(flags, nofile);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001773 if (unlikely(newfd < 0)) {
1774 err = newfd;
David S. Miller9a1875e2006-04-01 12:48:36 -08001775 sock_release(newsock);
Jens Axboede2ea4b2019-10-17 14:41:29 -06001776 goto out;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001777 }
Linus Torvaldsaab174f2012-10-02 20:25:04 -07001778 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
Viresh Kumarb5ffe632015-08-12 15:59:47 +05301779 if (IS_ERR(newfile)) {
Al Viro28407632012-08-17 23:54:15 -04001780 err = PTR_ERR(newfile);
1781 put_unused_fd(newfd);
Jens Axboede2ea4b2019-10-17 14:41:29 -06001782 goto out;
Al Viro28407632012-08-17 23:54:15 -04001783 }
David S. Miller39d8c1b2006-03-20 17:13:49 -08001784
Frank Filza79af592005-09-27 15:23:38 -07001785 err = security_socket_accept(sock, newsock);
1786 if (err)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001787 goto out_fd;
Frank Filza79af592005-09-27 15:23:38 -07001788
Jens Axboede2ea4b2019-10-17 14:41:29 -06001789 err = sock->ops->accept(sock, newsock, sock->file->f_flags | file_flags,
1790 false);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001791 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001792 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001793
1794 if (upeer_sockaddr) {
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001795 len = newsock->ops->getname(newsock,
1796 (struct sockaddr *)&address, 2);
1797 if (len < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001798 err = -ECONNABORTED;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001799 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001800 }
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00001801 err = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001802 len, upeer_sockaddr, upeer_addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001803 if (err < 0)
David S. Miller39d8c1b2006-03-20 17:13:49 -08001804 goto out_fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805 }
1806
1807 /* File flags are not inherited via accept() unlike another OSes. */
1808
David S. Miller39d8c1b2006-03-20 17:13:49 -08001809 fd_install(newfd, newfile);
1810 err = newfd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001811out:
1812 return err;
David S. Miller39d8c1b2006-03-20 17:13:49 -08001813out_fd:
David S. Miller9606a212006-04-01 01:00:14 -08001814 fput(newfile);
David S. Miller39d8c1b2006-03-20 17:13:49 -08001815 put_unused_fd(newfd);
Jens Axboede2ea4b2019-10-17 14:41:29 -06001816 goto out;
1817
1818}
1819
1820/*
1821 * For accept, we attempt to create a new socket, set up the link
1822 * with the client, wake up the client, then return the new
1823 * connected fd. We collect the address of the connector in kernel
1824 * space and move it to user at the very end. This is unclean because
1825 * we open the socket then return an error.
1826 *
1827 * 1003.1g adds the ability to recvmsg() to query connection pending
1828 * status to recvmsg. We need to add that support in a way thats
1829 * clean when we restructure accept also.
1830 */
1831
1832int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr,
1833 int __user *upeer_addrlen, int flags)
1834{
1835 int ret = -EBADF;
1836 struct fd f;
1837
1838 f = fdget(fd);
1839 if (f.file) {
1840 ret = __sys_accept4_file(f.file, 0, upeer_sockaddr,
Jens Axboe09952e32020-03-19 20:16:56 -06001841 upeer_addrlen, flags,
1842 rlimit(RLIMIT_NOFILE));
Miaohe Lin6b07ede2020-08-06 19:52:24 +08001843 fdput(f);
Jens Axboede2ea4b2019-10-17 14:41:29 -06001844 }
1845
1846 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001847}
1848
Dominik Brodowski4541e802018-03-13 19:24:23 +01001849SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1850 int __user *, upeer_addrlen, int, flags)
1851{
1852 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags);
1853}
1854
Heiko Carstens20f37032009-01-14 14:14:23 +01001855SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1856 int __user *, upeer_addrlen)
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001857{
Dominik Brodowski4541e802018-03-13 19:24:23 +01001858 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07001859}
1860
Linus Torvalds1da177e2005-04-16 15:20:36 -07001861/*
1862 * Attempt to connect to a socket with the server address. The address
1863 * is in user space so we verify it is OK and move it to kernel space.
1864 *
1865 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1866 * break bindings
1867 *
1868 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1869 * other SEQPACKET protocols that take time to connect() as it doesn't
1870 * include the -EINPROGRESS status for such sockets.
1871 */
1872
Jens Axboef499a022019-12-02 16:28:46 -07001873int __sys_connect_file(struct file *file, struct sockaddr_storage *address,
Jens Axboebd3ded32019-11-23 14:17:16 -07001874 int addrlen, int file_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001875{
1876 struct socket *sock;
Jens Axboebd3ded32019-11-23 14:17:16 -07001877 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001878
Florent Revestdba4a922020-12-04 12:36:04 +01001879 sock = sock_from_file(file);
1880 if (!sock) {
1881 err = -ENOTSOCK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882 goto out;
Florent Revestdba4a922020-12-04 12:36:04 +01001883 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001884
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001885 err =
Jens Axboef499a022019-12-02 16:28:46 -07001886 security_socket_connect(sock, (struct sockaddr *)address, addrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001887 if (err)
Jens Axboebd3ded32019-11-23 14:17:16 -07001888 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001889
Jens Axboef499a022019-12-02 16:28:46 -07001890 err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen,
Jens Axboebd3ded32019-11-23 14:17:16 -07001891 sock->file->f_flags | file_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001892out:
1893 return err;
1894}
1895
Jens Axboebd3ded32019-11-23 14:17:16 -07001896int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen)
1897{
1898 int ret = -EBADF;
1899 struct fd f;
1900
1901 f = fdget(fd);
1902 if (f.file) {
Jens Axboef499a022019-12-02 16:28:46 -07001903 struct sockaddr_storage address;
1904
1905 ret = move_addr_to_kernel(uservaddr, addrlen, &address);
1906 if (!ret)
1907 ret = __sys_connect_file(f.file, &address, addrlen, 0);
Miaohe Lin6b07ede2020-08-06 19:52:24 +08001908 fdput(f);
Jens Axboebd3ded32019-11-23 14:17:16 -07001909 }
1910
1911 return ret;
1912}
1913
Dominik Brodowski1387c2c2018-03-13 19:35:09 +01001914SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1915 int, addrlen)
1916{
1917 return __sys_connect(fd, uservaddr, addrlen);
1918}
1919
Linus Torvalds1da177e2005-04-16 15:20:36 -07001920/*
1921 * Get the local address ('name') of a socket object. Move the obtained
1922 * name to user space.
1923 */
1924
Dominik Brodowski8882a102018-03-13 19:43:14 +01001925int __sys_getsockname(int fd, struct sockaddr __user *usockaddr,
1926 int __user *usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001927{
1928 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001929 struct sockaddr_storage address;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001930 int err, fput_needed;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001931
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001932 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001933 if (!sock)
1934 goto out;
1935
1936 err = security_socket_getsockname(sock);
1937 if (err)
1938 goto out_put;
1939
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001940 err = sock->ops->getname(sock, (struct sockaddr *)&address, 0);
1941 if (err < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001942 goto out_put;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001943 /* "err" is actually length in this case */
1944 err = move_addr_to_user(&address, err, usockaddr, usockaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001945
1946out_put:
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001947 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001948out:
1949 return err;
1950}
1951
Dominik Brodowski8882a102018-03-13 19:43:14 +01001952SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1953 int __user *, usockaddr_len)
1954{
1955 return __sys_getsockname(fd, usockaddr, usockaddr_len);
1956}
1957
Linus Torvalds1da177e2005-04-16 15:20:36 -07001958/*
1959 * Get the remote address ('name') of a socket object. Move the obtained
1960 * name to user space.
1961 */
1962
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01001963int __sys_getpeername(int fd, struct sockaddr __user *usockaddr,
1964 int __user *usockaddr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001965{
1966 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07001967 struct sockaddr_storage address;
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001968 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001969
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001970 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1971 if (sock != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972 err = security_socket_getpeername(sock);
1973 if (err) {
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001974 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001975 return err;
1976 }
1977
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001978 err = sock->ops->getname(sock, (struct sockaddr *)&address, 1);
1979 if (err >= 0)
1980 /* "err" is actually length in this case */
1981 err = move_addr_to_user(&address, err, usockaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07001982 usockaddr_len);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08001983 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001984 }
1985 return err;
1986}
1987
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01001988SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1989 int __user *, usockaddr_len)
1990{
1991 return __sys_getpeername(fd, usockaddr, usockaddr_len);
1992}
1993
Linus Torvalds1da177e2005-04-16 15:20:36 -07001994/*
1995 * Send a datagram to a given address. We move the address into kernel
1996 * space and check the user space data area is readable before invoking
1997 * the protocol.
1998 */
Dominik Brodowski211b6342018-03-13 19:18:52 +01001999int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags,
2000 struct sockaddr __user *addr, int addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002001{
2002 struct socket *sock;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002003 struct sockaddr_storage address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002004 int err;
2005 struct msghdr msg;
2006 struct iovec iov;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002007 int fput_needed;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002008
Al Viro602bd0e2015-03-21 19:12:32 -04002009 err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter);
2010 if (unlikely(err))
2011 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08002012 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2013 if (!sock)
David S. Miller4387ff72007-02-08 15:06:08 -08002014 goto out;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002015
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002016 msg.msg_name = NULL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002017 msg.msg_control = NULL;
2018 msg.msg_controllen = 0;
2019 msg.msg_namelen = 0;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002020 if (addr) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002021 err = move_addr_to_kernel(addr, addr_len, &address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002022 if (err < 0)
2023 goto out_put;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002024 msg.msg_name = (struct sockaddr *)&address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002025 msg.msg_namelen = addr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002026 }
2027 if (sock->file->f_flags & O_NONBLOCK)
2028 flags |= MSG_DONTWAIT;
2029 msg.msg_flags = flags;
Al Virod8725c82014-12-11 00:02:50 -05002030 err = sock_sendmsg(sock, &msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002031
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002032out_put:
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08002033 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08002034out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002035 return err;
2036}
2037
Dominik Brodowski211b6342018-03-13 19:18:52 +01002038SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
2039 unsigned int, flags, struct sockaddr __user *, addr,
2040 int, addr_len)
2041{
2042 return __sys_sendto(fd, buff, len, flags, addr, addr_len);
2043}
2044
Linus Torvalds1da177e2005-04-16 15:20:36 -07002045/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002046 * Send a datagram down a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002047 */
2048
Heiko Carstens3e0fa652009-01-14 14:14:24 +01002049SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
Eric Dumazet95c96172012-04-15 05:58:06 +00002050 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051{
Dominik Brodowski211b6342018-03-13 19:18:52 +01002052 return __sys_sendto(fd, buff, len, flags, NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002053}
2054
2055/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002056 * Receive a frame from the socket and optionally record the address of the
Linus Torvalds1da177e2005-04-16 15:20:36 -07002057 * sender. We verify the buffers are writable and if needed move the
2058 * sender address from kernel to user space.
2059 */
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002060int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags,
2061 struct sockaddr __user *addr, int __user *addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002062{
2063 struct socket *sock;
2064 struct iovec iov;
2065 struct msghdr msg;
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002066 struct sockaddr_storage address;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002067 int err, err2;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002068 int fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002069
Al Viro602bd0e2015-03-21 19:12:32 -04002070 err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter);
2071 if (unlikely(err))
2072 return err;
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08002073 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002074 if (!sock)
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08002075 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002076
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002077 msg.msg_control = NULL;
2078 msg.msg_controllen = 0;
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002079 /* Save some cycles and don't copy the address if not needed */
2080 msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
2081 /* We assume all kernel code knows the size of sockaddr_storage */
2082 msg.msg_namelen = 0;
tadeusz.struk@intel.com130ed5d2015-12-15 10:46:17 -08002083 msg.msg_iocb = NULL;
Alexander Potapenko9f138fa2017-03-08 18:08:16 +01002084 msg.msg_flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002085 if (sock->file->f_flags & O_NONBLOCK)
2086 flags |= MSG_DONTWAIT;
Al Viro2da62902015-03-14 21:13:46 -04002087 err = sock_recvmsg(sock, &msg, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002088
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002089 if (err >= 0 && addr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002090 err2 = move_addr_to_user(&address,
YOSHIFUJI Hideaki230b1832008-07-19 22:35:47 -07002091 msg.msg_namelen, addr, addr_len);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002092 if (err2 < 0)
2093 err = err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002094 }
Pavel Emelyanovde0fa952007-11-14 16:01:43 -08002095
2096 fput_light(sock->file, fput_needed);
David S. Miller4387ff72007-02-08 15:06:08 -08002097out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002098 return err;
2099}
2100
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002101SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
2102 unsigned int, flags, struct sockaddr __user *, addr,
2103 int __user *, addr_len)
2104{
2105 return __sys_recvfrom(fd, ubuf, size, flags, addr, addr_len);
2106}
2107
Linus Torvalds1da177e2005-04-16 15:20:36 -07002108/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002109 * Receive a datagram from a socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002110 */
2111
Jan Glauberb7c0ddf2014-04-16 09:32:48 +02002112SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
2113 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002114{
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002115 return __sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002116}
2117
Florian Westphal83f0c102020-07-05 01:30:15 +02002118static bool sock_use_custom_sol_socket(const struct socket *sock)
2119{
2120 const struct sock *sk = sock->sk;
2121
2122 /* Use sock->ops->setsockopt() for MPTCP */
2123 return IS_ENABLED(CONFIG_MPTCP) &&
2124 sk->sk_protocol == IPPROTO_MPTCP &&
2125 sk->sk_type == SOCK_STREAM &&
2126 (sk->sk_family == AF_INET || sk->sk_family == AF_INET6);
2127}
2128
Linus Torvalds1da177e2005-04-16 15:20:36 -07002129/*
2130 * Set a socket option. Because we don't know the option lengths we have
2131 * to pass the user mode parameter for the protocols to sort out.
2132 */
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02002133int __sys_setsockopt(int fd, int level, int optname, char __user *user_optval,
Christoph Hellwig55db9c02020-07-17 08:23:15 +02002134 int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002135{
Christoph Hellwig519a8a62020-08-10 18:42:14 +02002136 sockptr_t optval = USER_SOCKPTR(user_optval);
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002137 char *kernel_optval = NULL;
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002138 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002139 struct socket *sock;
2140
2141 if (optlen < 0)
2142 return -EINVAL;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002143
2144 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Christoph Hellwig4a367292020-07-17 08:23:11 +02002145 if (!sock)
2146 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002147
Christoph Hellwig4a367292020-07-17 08:23:11 +02002148 err = security_socket_setsockopt(sock, level, optname);
2149 if (err)
2150 goto out_put;
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002151
Christoph Hellwig55db9c02020-07-17 08:23:15 +02002152 if (!in_compat_syscall())
2153 err = BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock->sk, &level, &optname,
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02002154 user_optval, &optlen,
Christoph Hellwig55db9c02020-07-17 08:23:15 +02002155 &kernel_optval);
Christoph Hellwig4a367292020-07-17 08:23:11 +02002156 if (err < 0)
2157 goto out_put;
2158 if (err > 0) {
2159 err = 0;
2160 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002161 }
Christoph Hellwig4a367292020-07-17 08:23:11 +02002162
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02002163 if (kernel_optval)
2164 optval = KERNEL_SOCKPTR(kernel_optval);
Christoph Hellwig4a367292020-07-17 08:23:11 +02002165 if (level == SOL_SOCKET && !sock_use_custom_sol_socket(sock))
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02002166 err = sock_setsockopt(sock, level, optname, optval, optlen);
Christoph Hellwiga44d9e72020-07-17 08:23:31 +02002167 else if (unlikely(!sock->ops->setsockopt))
2168 err = -EOPNOTSUPP;
Christoph Hellwig4a367292020-07-17 08:23:11 +02002169 else
2170 err = sock->ops->setsockopt(sock, level, optname, optval,
2171 optlen);
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02002172 kfree(kernel_optval);
Christoph Hellwig4a367292020-07-17 08:23:11 +02002173out_put:
2174 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002175 return err;
2176}
2177
Dominik Brodowskicc36dca2018-03-13 20:10:59 +01002178SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
2179 char __user *, optval, int, optlen)
2180{
2181 return __sys_setsockopt(fd, level, optname, optval, optlen);
2182}
2183
Stanislav Fomichev9cacf812021-01-15 08:34:59 -08002184INDIRECT_CALLABLE_DECLARE(bool tcp_bpf_bypass_getsockopt(int level,
2185 int optname));
2186
Linus Torvalds1da177e2005-04-16 15:20:36 -07002187/*
2188 * Get a socket option. Because we don't know the option lengths we have
2189 * to pass a user mode parameter for the protocols to sort out.
2190 */
Christoph Hellwig55db9c02020-07-17 08:23:15 +02002191int __sys_getsockopt(int fd, int level, int optname, char __user *optval,
2192 int __user *optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002193{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002194 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002195 struct socket *sock;
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002196 int max_optlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002197
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002198 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Christoph Hellwigd8a9b382020-07-17 08:23:12 +02002199 if (!sock)
2200 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002201
Christoph Hellwigd8a9b382020-07-17 08:23:12 +02002202 err = security_socket_getsockopt(sock, level, optname);
2203 if (err)
2204 goto out_put;
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002205
Christoph Hellwig55db9c02020-07-17 08:23:15 +02002206 if (!in_compat_syscall())
2207 max_optlen = BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen);
Christoph Hellwigd8a9b382020-07-17 08:23:12 +02002208
2209 if (level == SOL_SOCKET)
2210 err = sock_getsockopt(sock, level, optname, optval, optlen);
Christoph Hellwiga44d9e72020-07-17 08:23:31 +02002211 else if (unlikely(!sock->ops->getsockopt))
2212 err = -EOPNOTSUPP;
Christoph Hellwigd8a9b382020-07-17 08:23:12 +02002213 else
2214 err = sock->ops->getsockopt(sock, level, optname, optval,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002215 optlen);
Stanislav Fomichev0d01da62019-06-27 13:38:47 -07002216
Christoph Hellwig55db9c02020-07-17 08:23:15 +02002217 if (!in_compat_syscall())
2218 err = BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock->sk, level, optname,
2219 optval, optlen, max_optlen,
2220 err);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002221out_put:
Christoph Hellwigd8a9b382020-07-17 08:23:12 +02002222 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002223 return err;
2224}
2225
Dominik Brodowski13a2d702018-03-13 20:15:04 +01002226SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
2227 char __user *, optval, int __user *, optlen)
2228{
2229 return __sys_getsockopt(fd, level, optname, optval, optlen);
2230}
2231
Linus Torvalds1da177e2005-04-16 15:20:36 -07002232/*
2233 * Shutdown a socket.
2234 */
2235
Jens Axboeb713c192020-09-05 11:13:35 -06002236int __sys_shutdown_sock(struct socket *sock, int how)
2237{
2238 int err;
2239
2240 err = security_socket_shutdown(sock, how);
2241 if (!err)
2242 err = sock->ops->shutdown(sock, how);
2243
2244 return err;
2245}
2246
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01002247int __sys_shutdown(int fd, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002248{
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002249 int err, fput_needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002250 struct socket *sock;
2251
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002252 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2253 if (sock != NULL) {
Jens Axboeb713c192020-09-05 11:13:35 -06002254 err = __sys_shutdown_sock(sock, how);
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002255 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002256 }
2257 return err;
2258}
2259
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01002260SYSCALL_DEFINE2(shutdown, int, fd, int, how)
2261{
2262 return __sys_shutdown(fd, how);
2263}
2264
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002265/* A couple of helpful macros for getting the address of the 32/64 bit
Linus Torvalds1da177e2005-04-16 15:20:36 -07002266 * fields which are the same type (int / unsigned) on our platforms.
2267 */
2268#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
2269#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
2270#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
2271
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002272struct used_address {
2273 struct sockaddr_storage name;
2274 unsigned int name_len;
2275};
2276
Jens Axboe0a384ab2020-02-27 08:11:20 -07002277int __copy_msghdr_from_user(struct msghdr *kmsg,
2278 struct user_msghdr __user *umsg,
2279 struct sockaddr __user **save_addr,
2280 struct iovec __user **uiov, size_t *nsegs)
Dan Carpenter1661bf32013-10-03 00:27:20 +03002281{
Al Viroffb07552017-06-27 19:32:04 -04002282 struct user_msghdr msg;
Al Viro08adb7d2014-11-10 20:23:13 -05002283 ssize_t err;
2284
Al Viroffb07552017-06-27 19:32:04 -04002285 if (copy_from_user(&msg, umsg, sizeof(*umsg)))
Dan Carpenter1661bf32013-10-03 00:27:20 +03002286 return -EFAULT;
Matthew Leachdbb490b2014-03-11 11:58:27 +00002287
Christoph Hellwig1f466e12020-05-11 13:59:13 +02002288 kmsg->msg_control_is_user = true;
2289 kmsg->msg_control_user = msg.msg_control;
Al Viroffb07552017-06-27 19:32:04 -04002290 kmsg->msg_controllen = msg.msg_controllen;
2291 kmsg->msg_flags = msg.msg_flags;
2292
2293 kmsg->msg_namelen = msg.msg_namelen;
2294 if (!msg.msg_name)
Ani Sinha6a2a2b32014-09-08 14:49:59 -07002295 kmsg->msg_namelen = 0;
2296
Matthew Leachdbb490b2014-03-11 11:58:27 +00002297 if (kmsg->msg_namelen < 0)
2298 return -EINVAL;
2299
Dan Carpenter1661bf32013-10-03 00:27:20 +03002300 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
Dan Carpenterdb31c552013-11-27 15:40:21 +03002301 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
Al Viro08adb7d2014-11-10 20:23:13 -05002302
2303 if (save_addr)
Al Viroffb07552017-06-27 19:32:04 -04002304 *save_addr = msg.msg_name;
Al Viro08adb7d2014-11-10 20:23:13 -05002305
Al Viroffb07552017-06-27 19:32:04 -04002306 if (msg.msg_name && kmsg->msg_namelen) {
Al Viro08adb7d2014-11-10 20:23:13 -05002307 if (!save_addr) {
Paolo Abeni864d9662017-07-21 18:49:45 +02002308 err = move_addr_to_kernel(msg.msg_name,
2309 kmsg->msg_namelen,
Al Viro08adb7d2014-11-10 20:23:13 -05002310 kmsg->msg_name);
2311 if (err < 0)
2312 return err;
2313 }
2314 } else {
2315 kmsg->msg_name = NULL;
2316 kmsg->msg_namelen = 0;
2317 }
2318
Al Viroffb07552017-06-27 19:32:04 -04002319 if (msg.msg_iovlen > UIO_MAXIOV)
Al Viro08adb7d2014-11-10 20:23:13 -05002320 return -EMSGSIZE;
2321
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -07002322 kmsg->msg_iocb = NULL;
Jens Axboe0a384ab2020-02-27 08:11:20 -07002323 *uiov = msg.msg_iov;
2324 *nsegs = msg.msg_iovlen;
2325 return 0;
2326}
2327
2328static int copy_msghdr_from_user(struct msghdr *kmsg,
2329 struct user_msghdr __user *umsg,
2330 struct sockaddr __user **save_addr,
2331 struct iovec **iov)
2332{
2333 struct user_msghdr msg;
2334 ssize_t err;
2335
2336 err = __copy_msghdr_from_user(kmsg, umsg, save_addr, &msg.msg_iov,
2337 &msg.msg_iovlen);
2338 if (err)
2339 return err;
tadeusz.struk@intel.com0345f932015-03-19 12:31:25 -07002340
Jens Axboe87e5e6d2019-05-14 16:02:22 -06002341 err = import_iovec(save_addr ? READ : WRITE,
Al Viroffb07552017-06-27 19:32:04 -04002342 msg.msg_iov, msg.msg_iovlen,
Al Viroda184282015-03-21 19:29:06 -04002343 UIO_FASTIOV, iov, &kmsg->msg_iter);
Jens Axboe87e5e6d2019-05-14 16:02:22 -06002344 return err < 0 ? err : 0;
Dan Carpenter1661bf32013-10-03 00:27:20 +03002345}
2346
Jens Axboe4257c8c2019-11-25 14:27:34 -07002347static int ____sys_sendmsg(struct socket *sock, struct msghdr *msg_sys,
2348 unsigned int flags, struct used_address *used_address,
2349 unsigned int allowed_msghdr_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002350{
Alex Williamsonb9d717a2005-09-26 14:28:02 -07002351 unsigned char ctl[sizeof(struct cmsghdr) + 20]
Amit Kushwaha846cc122016-12-08 18:21:53 +05302352 __aligned(sizeof(__kernel_size_t));
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002353 /* 20 is size of ipv6_pktinfo */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002354 unsigned char *ctl_buf = ctl;
Al Virod8725c82014-12-11 00:02:50 -05002355 int ctl_len;
Al Viro08adb7d2014-11-10 20:23:13 -05002356 ssize_t err;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002357
Linus Torvalds1da177e2005-04-16 15:20:36 -07002358 err = -ENOBUFS;
2359
Anton Blanchard228e5482011-05-02 20:21:35 +00002360 if (msg_sys->msg_controllen > INT_MAX)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002361 goto out;
Tom Herbert28a94d82016-03-07 14:11:02 -08002362 flags |= (msg_sys->msg_flags & allowed_msghdr_flags);
Anton Blanchard228e5482011-05-02 20:21:35 +00002363 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002364 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002365 err =
Anton Blanchard228e5482011-05-02 20:21:35 +00002366 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002367 sizeof(ctl));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002368 if (err)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002369 goto out;
Anton Blanchard228e5482011-05-02 20:21:35 +00002370 ctl_buf = msg_sys->msg_control;
2371 ctl_len = msg_sys->msg_controllen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002372 } else if (ctl_len) {
David S. Millerac4340f2017-01-04 13:24:19 -05002373 BUILD_BUG_ON(sizeof(struct cmsghdr) !=
2374 CMSG_ALIGN(sizeof(struct cmsghdr)));
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002375 if (ctl_len > sizeof(ctl)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002376 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002377 if (ctl_buf == NULL)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002378 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002379 }
2380 err = -EFAULT;
Christoph Hellwig1f466e12020-05-11 13:59:13 +02002381 if (copy_from_user(ctl_buf, msg_sys->msg_control_user, ctl_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002382 goto out_freectl;
Anton Blanchard228e5482011-05-02 20:21:35 +00002383 msg_sys->msg_control = ctl_buf;
Christoph Hellwig1f466e12020-05-11 13:59:13 +02002384 msg_sys->msg_control_is_user = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002385 }
Anton Blanchard228e5482011-05-02 20:21:35 +00002386 msg_sys->msg_flags = flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002387
2388 if (sock->file->f_flags & O_NONBLOCK)
Anton Blanchard228e5482011-05-02 20:21:35 +00002389 msg_sys->msg_flags |= MSG_DONTWAIT;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002390 /*
2391 * If this is sendmmsg() and current destination address is same as
2392 * previously succeeded address, omit asking LSM's decision.
2393 * used_address->name_len is initialized to UINT_MAX so that the first
2394 * destination address never matches.
2395 */
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07002396 if (used_address && msg_sys->msg_name &&
2397 used_address->name_len == msg_sys->msg_namelen &&
2398 !memcmp(&used_address->name, msg_sys->msg_name,
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002399 used_address->name_len)) {
Al Virod8725c82014-12-11 00:02:50 -05002400 err = sock_sendmsg_nosec(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002401 goto out_freectl;
2402 }
Al Virod8725c82014-12-11 00:02:50 -05002403 err = sock_sendmsg(sock, msg_sys);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002404 /*
2405 * If this is sendmmsg() and sending to current destination address was
2406 * successful, remember it.
2407 */
2408 if (used_address && err >= 0) {
2409 used_address->name_len = msg_sys->msg_namelen;
Mathieu Desnoyersbc909d92011-08-24 19:45:03 -07002410 if (msg_sys->msg_name)
2411 memcpy(&used_address->name, msg_sys->msg_name,
2412 used_address->name_len);
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002413 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002414
2415out_freectl:
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002416 if (ctl_buf != ctl)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002417 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
Jens Axboe4257c8c2019-11-25 14:27:34 -07002418out:
2419 return err;
2420}
2421
Jens Axboe03b12302019-12-02 18:50:25 -07002422int sendmsg_copy_msghdr(struct msghdr *msg,
2423 struct user_msghdr __user *umsg, unsigned flags,
2424 struct iovec **iov)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002425{
2426 int err;
2427
2428 if (flags & MSG_CMSG_COMPAT) {
2429 struct compat_msghdr __user *msg_compat;
2430
2431 msg_compat = (struct compat_msghdr __user *) umsg;
2432 err = get_compat_msghdr(msg, msg_compat, NULL, iov);
2433 } else {
2434 err = copy_msghdr_from_user(msg, umsg, NULL, iov);
2435 }
2436 if (err < 0)
2437 return err;
2438
2439 return 0;
2440}
2441
2442static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
2443 struct msghdr *msg_sys, unsigned int flags,
2444 struct used_address *used_address,
2445 unsigned int allowed_msghdr_flags)
2446{
2447 struct sockaddr_storage address;
2448 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
2449 ssize_t err;
2450
2451 msg_sys->msg_name = &address;
2452
2453 err = sendmsg_copy_msghdr(msg_sys, msg, flags, &iov);
2454 if (err < 0)
2455 return err;
2456
2457 err = ____sys_sendmsg(sock, msg_sys, flags, used_address,
2458 allowed_msghdr_flags);
Al Viroda184282015-03-21 19:29:06 -04002459 kfree(iov);
Anton Blanchard228e5482011-05-02 20:21:35 +00002460 return err;
2461}
2462
2463/*
2464 * BSD sendmsg interface
2465 */
Jens Axboe03b12302019-12-02 18:50:25 -07002466long __sys_sendmsg_sock(struct socket *sock, struct msghdr *msg,
Jens Axboe0fa03c62019-04-19 13:34:07 -06002467 unsigned int flags)
2468{
Jens Axboe03b12302019-12-02 18:50:25 -07002469 return ____sys_sendmsg(sock, msg, flags, NULL, 0);
Jens Axboe0fa03c62019-04-19 13:34:07 -06002470}
Anton Blanchard228e5482011-05-02 20:21:35 +00002471
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002472long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
2473 bool forbid_cmsg_compat)
Anton Blanchard228e5482011-05-02 20:21:35 +00002474{
2475 int fput_needed, err;
2476 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002477 struct socket *sock;
Anton Blanchard228e5482011-05-02 20:21:35 +00002478
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002479 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2480 return -EINVAL;
2481
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002482 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Anton Blanchard228e5482011-05-02 20:21:35 +00002483 if (!sock)
2484 goto out;
2485
Tom Herbert28a94d82016-03-07 14:11:02 -08002486 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0);
Anton Blanchard228e5482011-05-02 20:21:35 +00002487
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002488 fput_light(sock->file, fput_needed);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002489out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002490 return err;
2491}
2492
Al Viro666547f2014-04-06 14:03:05 -04002493SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags)
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002494{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002495 return __sys_sendmsg(fd, msg, flags, true);
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002496}
2497
Anton Blanchard228e5482011-05-02 20:21:35 +00002498/*
2499 * Linux sendmmsg interface
2500 */
2501
2502int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002503 unsigned int flags, bool forbid_cmsg_compat)
Anton Blanchard228e5482011-05-02 20:21:35 +00002504{
2505 int fput_needed, err, datagrams;
2506 struct socket *sock;
2507 struct mmsghdr __user *entry;
2508 struct compat_mmsghdr __user *compat_entry;
2509 struct msghdr msg_sys;
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002510 struct used_address used_address;
Tom Herbertf0922762016-03-07 14:11:03 -08002511 unsigned int oflags = flags;
Anton Blanchard228e5482011-05-02 20:21:35 +00002512
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002513 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2514 return -EINVAL;
2515
Anton Blanchard98382f42011-08-04 14:07:39 +00002516 if (vlen > UIO_MAXIOV)
2517 vlen = UIO_MAXIOV;
Anton Blanchard228e5482011-05-02 20:21:35 +00002518
2519 datagrams = 0;
2520
2521 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2522 if (!sock)
2523 return err;
2524
Tetsuo Handac71d8eb2011-08-04 14:07:40 +00002525 used_address.name_len = UINT_MAX;
Anton Blanchard228e5482011-05-02 20:21:35 +00002526 entry = mmsg;
2527 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Anton Blanchard728ffb82011-08-04 14:07:38 +00002528 err = 0;
Tom Herbertf0922762016-03-07 14:11:03 -08002529 flags |= MSG_BATCH;
Anton Blanchard228e5482011-05-02 20:21:35 +00002530
2531 while (datagrams < vlen) {
Tom Herbertf0922762016-03-07 14:11:03 -08002532 if (datagrams == vlen - 1)
2533 flags = oflags;
2534
Anton Blanchard228e5482011-05-02 20:21:35 +00002535 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002536 err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002537 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002538 if (err < 0)
2539 break;
2540 err = __put_user(err, &compat_entry->msg_len);
2541 ++compat_entry;
2542 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002543 err = ___sys_sendmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002544 (struct user_msghdr __user *)entry,
Tom Herbert28a94d82016-03-07 14:11:02 -08002545 &msg_sys, flags, &used_address, MSG_EOR);
Anton Blanchard228e5482011-05-02 20:21:35 +00002546 if (err < 0)
2547 break;
2548 err = put_user(err, &entry->msg_len);
2549 ++entry;
2550 }
2551
2552 if (err)
2553 break;
2554 ++datagrams;
Soheil Hassas Yeganeh30238982016-11-04 15:36:49 -04002555 if (msg_data_left(&msg_sys))
2556 break;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002557 cond_resched();
Anton Blanchard228e5482011-05-02 20:21:35 +00002558 }
2559
Anton Blanchard228e5482011-05-02 20:21:35 +00002560 fput_light(sock->file, fput_needed);
2561
Anton Blanchard728ffb82011-08-04 14:07:38 +00002562 /* We only return an error if no datagrams were able to be sent */
2563 if (datagrams != 0)
Anton Blanchard228e5482011-05-02 20:21:35 +00002564 return datagrams;
2565
Anton Blanchard228e5482011-05-02 20:21:35 +00002566 return err;
2567}
2568
2569SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2570 unsigned int, vlen, unsigned int, flags)
2571{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002572 return __sys_sendmmsg(fd, mmsg, vlen, flags, true);
Anton Blanchard228e5482011-05-02 20:21:35 +00002573}
2574
Jens Axboe03b12302019-12-02 18:50:25 -07002575int recvmsg_copy_msghdr(struct msghdr *msg,
2576 struct user_msghdr __user *umsg, unsigned flags,
2577 struct sockaddr __user **uaddr,
2578 struct iovec **iov)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002579{
2580 ssize_t err;
2581
2582 if (MSG_CMSG_COMPAT & flags) {
2583 struct compat_msghdr __user *msg_compat;
2584
2585 msg_compat = (struct compat_msghdr __user *) umsg;
2586 err = get_compat_msghdr(msg, msg_compat, uaddr, iov);
2587 } else {
2588 err = copy_msghdr_from_user(msg, umsg, uaddr, iov);
2589 }
2590 if (err < 0)
2591 return err;
2592
2593 return 0;
2594}
2595
2596static int ____sys_recvmsg(struct socket *sock, struct msghdr *msg_sys,
2597 struct user_msghdr __user *msg,
2598 struct sockaddr __user *uaddr,
2599 unsigned int flags, int nosec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002600{
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002601 struct compat_msghdr __user *msg_compat =
Jens Axboe4257c8c2019-11-25 14:27:34 -07002602 (struct compat_msghdr __user *) msg;
2603 int __user *uaddr_len = COMPAT_NAMELEN(msg);
2604 struct sockaddr_storage addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002605 unsigned long cmsg_ptr;
Al Viro2da62902015-03-14 21:13:46 -04002606 int len;
Al Viro08adb7d2014-11-10 20:23:13 -05002607 ssize_t err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002608
Al Viro08adb7d2014-11-10 20:23:13 -05002609 msg_sys->msg_name = &addr;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002610 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2611 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002612
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01002613 /* We assume all kernel code knows the size of sockaddr_storage */
2614 msg_sys->msg_namelen = 0;
2615
Linus Torvalds1da177e2005-04-16 15:20:36 -07002616 if (sock->file->f_flags & O_NONBLOCK)
2617 flags |= MSG_DONTWAIT;
Eric Dumazet1af66222019-12-06 09:38:36 -08002618
2619 if (unlikely(nosec))
2620 err = sock_recvmsg_nosec(sock, msg_sys, flags);
2621 else
2622 err = sock_recvmsg(sock, msg_sys, flags);
2623
Linus Torvalds1da177e2005-04-16 15:20:36 -07002624 if (err < 0)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002625 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002626 len = err;
2627
2628 if (uaddr != NULL) {
Maciej Żenczykowski43db3622012-03-11 12:51:50 +00002629 err = move_addr_to_user(&addr,
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002630 msg_sys->msg_namelen, uaddr,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002631 uaddr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002632 if (err < 0)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002633 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002634 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002635 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
David S. Miller37f7f422005-09-16 16:51:01 -07002636 COMPAT_FLAGS(msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002637 if (err)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002638 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002639 if (MSG_CMSG_COMPAT & flags)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002640 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002641 &msg_compat->msg_controllen);
2642 else
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002643 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002644 &msg->msg_controllen);
2645 if (err)
Jens Axboe4257c8c2019-11-25 14:27:34 -07002646 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002647 err = len;
Jens Axboe4257c8c2019-11-25 14:27:34 -07002648out:
2649 return err;
2650}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002651
Jens Axboe4257c8c2019-11-25 14:27:34 -07002652static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
2653 struct msghdr *msg_sys, unsigned int flags, int nosec)
2654{
2655 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
2656 /* user mode address pointers */
2657 struct sockaddr __user *uaddr;
2658 ssize_t err;
2659
2660 err = recvmsg_copy_msghdr(msg_sys, msg, flags, &uaddr, &iov);
2661 if (err < 0)
2662 return err;
2663
2664 err = ____sys_recvmsg(sock, msg_sys, msg, uaddr, flags, nosec);
Al Viroda184282015-03-21 19:29:06 -04002665 kfree(iov);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002666 return err;
2667}
2668
2669/*
2670 * BSD recvmsg interface
2671 */
2672
Jens Axboe03b12302019-12-02 18:50:25 -07002673long __sys_recvmsg_sock(struct socket *sock, struct msghdr *msg,
2674 struct user_msghdr __user *umsg,
2675 struct sockaddr __user *uaddr, unsigned int flags)
Jens Axboeaa1fa282019-04-19 13:38:09 -06002676{
Jens Axboe03b12302019-12-02 18:50:25 -07002677 return ____sys_recvmsg(sock, msg, umsg, uaddr, flags, 0);
Jens Axboeaa1fa282019-04-19 13:38:09 -06002678}
2679
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002680long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags,
2681 bool forbid_cmsg_compat)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002682{
2683 int fput_needed, err;
2684 struct msghdr msg_sys;
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002685 struct socket *sock;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002686
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002687 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT))
2688 return -EINVAL;
2689
Andy Lutomirski1be374a2013-05-22 14:07:44 -07002690 sock = sockfd_lookup_light(fd, &err, &fput_needed);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002691 if (!sock)
2692 goto out;
2693
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002694 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002695
Benjamin LaHaise6cb153c2006-03-20 22:27:12 -08002696 fput_light(sock->file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002697out:
2698 return err;
2699}
2700
Al Viro666547f2014-04-06 14:03:05 -04002701SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002702 unsigned int, flags)
2703{
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002704 return __sys_recvmsg(fd, msg, flags, true);
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002705}
2706
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002707/*
2708 * Linux recvmmsg interface
2709 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002710
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002711static int do_recvmmsg(int fd, struct mmsghdr __user *mmsg,
2712 unsigned int vlen, unsigned int flags,
2713 struct timespec64 *timeout)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002714{
2715 int fput_needed, err, datagrams;
2716 struct socket *sock;
2717 struct mmsghdr __user *entry;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002718 struct compat_mmsghdr __user *compat_entry;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002719 struct msghdr msg_sys;
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002720 struct timespec64 end_time;
2721 struct timespec64 timeout64;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002722
2723 if (timeout &&
2724 poll_select_set_timeout(&end_time, timeout->tv_sec,
2725 timeout->tv_nsec))
2726 return -EINVAL;
2727
2728 datagrams = 0;
2729
2730 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2731 if (!sock)
2732 return err;
2733
Soheil Hassas Yeganeh7797dc42018-02-27 18:22:40 -05002734 if (likely(!(flags & MSG_ERRQUEUE))) {
2735 err = sock_error(sock->sk);
2736 if (err) {
2737 datagrams = err;
2738 goto out_put;
2739 }
Maxime Jayate623a9e2017-02-21 18:35:51 +01002740 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002741
2742 entry = mmsg;
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002743 compat_entry = (struct compat_mmsghdr __user *)mmsg;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002744
2745 while (datagrams < vlen) {
2746 /*
2747 * No need to ask LSM for more than the first datagram.
2748 */
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002749 if (MSG_CMSG_COMPAT & flags) {
Al Viro666547f2014-04-06 14:03:05 -04002750 err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002751 &msg_sys, flags & ~MSG_WAITFORONE,
2752 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002753 if (err < 0)
2754 break;
2755 err = __put_user(err, &compat_entry->msg_len);
2756 ++compat_entry;
2757 } else {
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002758 err = ___sys_recvmsg(sock,
Al Viro666547f2014-04-06 14:03:05 -04002759 (struct user_msghdr __user *)entry,
Andy Lutomirskia7526eb2013-06-05 19:38:26 +00002760 &msg_sys, flags & ~MSG_WAITFORONE,
2761 datagrams);
Jean-Mickael Guerind7256d02009-12-01 08:47:26 +00002762 if (err < 0)
2763 break;
2764 err = put_user(err, &entry->msg_len);
2765 ++entry;
2766 }
2767
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002768 if (err)
2769 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002770 ++datagrams;
2771
Brandon L Black71c5c1592010-03-26 16:18:03 +00002772 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2773 if (flags & MSG_WAITFORONE)
2774 flags |= MSG_DONTWAIT;
2775
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002776 if (timeout) {
Deepa Dinamani766b9f92016-05-19 17:09:05 -07002777 ktime_get_ts64(&timeout64);
Arnd Bergmannc2e6c852018-04-18 13:42:25 +02002778 *timeout = timespec64_sub(end_time, timeout64);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002779 if (timeout->tv_sec < 0) {
2780 timeout->tv_sec = timeout->tv_nsec = 0;
2781 break;
2782 }
2783
2784 /* Timeout, return less than vlen datagrams */
2785 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2786 break;
2787 }
2788
2789 /* Out of band data, return right away */
2790 if (msg_sys.msg_flags & MSG_OOB)
2791 break;
Eric Dumazeta78cb842016-01-08 08:37:20 -08002792 cond_resched();
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002793 }
2794
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002795 if (err == 0)
2796 goto out_put;
2797
2798 if (datagrams == 0) {
2799 datagrams = err;
2800 goto out_put;
2801 }
2802
2803 /*
2804 * We may return less entries than requested (vlen) if the
2805 * sock is non block and there aren't enough datagrams...
2806 */
2807 if (err != -EAGAIN) {
2808 /*
2809 * ... or if recvmsg returns an error after we
2810 * received some datagrams, where we record the
2811 * error to return on the next call or if the
2812 * app asks about it using getsockopt(SO_ERROR).
2813 */
2814 sock->sk->sk_err = -err;
2815 }
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002816out_put:
2817 fput_light(sock->file, fput_needed);
2818
Arnaldo Carvalho de Melo34b88a62016-03-14 09:56:35 -03002819 return datagrams;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002820}
2821
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002822int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg,
2823 unsigned int vlen, unsigned int flags,
2824 struct __kernel_timespec __user *timeout,
2825 struct old_timespec32 __user *timeout32)
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002826{
2827 int datagrams;
Arnd Bergmannc2e6c852018-04-18 13:42:25 +02002828 struct timespec64 timeout_sys;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002829
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002830 if (timeout && get_timespec64(&timeout_sys, timeout))
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002831 return -EFAULT;
2832
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002833 if (timeout32 && get_old_timespec32(&timeout_sys, timeout32))
2834 return -EFAULT;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002835
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002836 if (!timeout && !timeout32)
2837 return do_recvmmsg(fd, mmsg, vlen, flags, NULL);
2838
2839 datagrams = do_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2840
2841 if (datagrams <= 0)
2842 return datagrams;
2843
2844 if (timeout && put_timespec64(&timeout_sys, timeout))
2845 datagrams = -EFAULT;
2846
2847 if (timeout32 && put_old_timespec32(&timeout_sys, timeout32))
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002848 datagrams = -EFAULT;
2849
2850 return datagrams;
2851}
2852
Dominik Brodowski1255e262018-03-13 20:44:21 +01002853SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2854 unsigned int, vlen, unsigned int, flags,
Arnd Bergmannc2e6c852018-04-18 13:42:25 +02002855 struct __kernel_timespec __user *, timeout)
Dominik Brodowski1255e262018-03-13 20:44:21 +01002856{
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002857 if (flags & MSG_CMSG_COMPAT)
2858 return -EINVAL;
2859
2860 return __sys_recvmmsg(fd, mmsg, vlen, flags, timeout, NULL);
Dominik Brodowski1255e262018-03-13 20:44:21 +01002861}
2862
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002863#ifdef CONFIG_COMPAT_32BIT_TIME
2864SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct mmsghdr __user *, mmsg,
2865 unsigned int, vlen, unsigned int, flags,
2866 struct old_timespec32 __user *, timeout)
2867{
2868 if (flags & MSG_CMSG_COMPAT)
2869 return -EINVAL;
2870
2871 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL, timeout);
2872}
2873#endif
2874
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002875#ifdef __ARCH_WANT_SYS_SOCKETCALL
Linus Torvalds1da177e2005-04-16 15:20:36 -07002876/* Argument list sizes for sys_socketcall */
2877#define AL(x) ((x) * sizeof(unsigned long))
Anton Blanchard228e5482011-05-02 20:21:35 +00002878static const unsigned char nargs[21] = {
Eric Dumazetc6d409c2010-06-03 20:03:40 -07002879 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2880 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2881 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
Anton Blanchard228e5482011-05-02 20:21:35 +00002882 AL(4), AL(5), AL(4)
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002883};
2884
Linus Torvalds1da177e2005-04-16 15:20:36 -07002885#undef AL
2886
2887/*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002888 * System call vectors.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002889 *
2890 * Argument checking cleaned up. Saved 20% in size.
2891 * This function doesn't need to set the kernel lock because
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002892 * it is set by the callees.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002893 */
2894
Heiko Carstens3e0fa652009-01-14 14:14:24 +01002895SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002896{
Chen Gang2950fa92013-04-07 16:55:23 +08002897 unsigned long a[AUDITSC_ARGS];
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002898 unsigned long a0, a1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002899 int err;
Arjan van de Ven47379052009-09-28 12:57:44 -07002900 unsigned int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002901
Anton Blanchard228e5482011-05-02 20:21:35 +00002902 if (call < 1 || call > SYS_SENDMMSG)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002903 return -EINVAL;
Jeremy Clinec8e8cd52018-07-27 22:43:01 +00002904 call = array_index_nospec(call, SYS_SENDMMSG + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002905
Arjan van de Ven47379052009-09-28 12:57:44 -07002906 len = nargs[call];
2907 if (len > sizeof(a))
2908 return -EINVAL;
2909
Linus Torvalds1da177e2005-04-16 15:20:36 -07002910 /* copy_from_user should be SMP safe. */
Arjan van de Ven47379052009-09-28 12:57:44 -07002911 if (copy_from_user(a, args, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002912 return -EFAULT;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002913
Chen Gang2950fa92013-04-07 16:55:23 +08002914 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2915 if (err)
2916 return err;
David Woodhouse3ec3b2f2005-05-17 12:08:48 +01002917
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002918 a0 = a[0];
2919 a1 = a[1];
2920
2921 switch (call) {
2922 case SYS_SOCKET:
Dominik Brodowski9d6a15c2018-03-13 19:29:43 +01002923 err = __sys_socket(a0, a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002924 break;
2925 case SYS_BIND:
Dominik Brodowskia87d35d2018-03-13 19:33:09 +01002926 err = __sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002927 break;
2928 case SYS_CONNECT:
Dominik Brodowski1387c2c2018-03-13 19:35:09 +01002929 err = __sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002930 break;
2931 case SYS_LISTEN:
Dominik Brodowski25e290e2018-03-13 19:36:54 +01002932 err = __sys_listen(a0, a1);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002933 break;
2934 case SYS_ACCEPT:
Dominik Brodowski4541e802018-03-13 19:24:23 +01002935 err = __sys_accept4(a0, (struct sockaddr __user *)a1,
2936 (int __user *)a[2], 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002937 break;
2938 case SYS_GETSOCKNAME:
2939 err =
Dominik Brodowski8882a102018-03-13 19:43:14 +01002940 __sys_getsockname(a0, (struct sockaddr __user *)a1,
2941 (int __user *)a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002942 break;
2943 case SYS_GETPEERNAME:
2944 err =
Dominik Brodowskib21c8f82018-03-13 19:47:00 +01002945 __sys_getpeername(a0, (struct sockaddr __user *)a1,
2946 (int __user *)a[2]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002947 break;
2948 case SYS_SOCKETPAIR:
Dominik Brodowski6debc8d2018-03-13 19:49:23 +01002949 err = __sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002950 break;
2951 case SYS_SEND:
Dominik Brodowskif3bf8962018-03-13 19:52:00 +01002952 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3],
2953 NULL, 0);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002954 break;
2955 case SYS_SENDTO:
Dominik Brodowski211b6342018-03-13 19:18:52 +01002956 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3],
2957 (struct sockaddr __user *)a[4], a[5]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002958 break;
2959 case SYS_RECV:
Dominik Brodowskid27e9af2018-03-13 19:54:17 +01002960 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2961 NULL, NULL);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002962 break;
2963 case SYS_RECVFROM:
Dominik Brodowski7a09e1e2018-03-13 19:10:06 +01002964 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2965 (struct sockaddr __user *)a[4],
2966 (int __user *)a[5]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002967 break;
2968 case SYS_SHUTDOWN:
Dominik Brodowski005a1ae2018-03-13 20:07:05 +01002969 err = __sys_shutdown(a0, a1);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002970 break;
2971 case SYS_SETSOCKOPT:
Dominik Brodowskicc36dca2018-03-13 20:10:59 +01002972 err = __sys_setsockopt(a0, a1, a[2], (char __user *)a[3],
2973 a[4]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002974 break;
2975 case SYS_GETSOCKOPT:
2976 err =
Dominik Brodowski13a2d702018-03-13 20:15:04 +01002977 __sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2978 (int __user *)a[4]);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002979 break;
2980 case SYS_SENDMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002981 err = __sys_sendmsg(a0, (struct user_msghdr __user *)a1,
2982 a[2], true);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002983 break;
Anton Blanchard228e5482011-05-02 20:21:35 +00002984 case SYS_SENDMMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002985 err = __sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2],
2986 a[3], true);
Anton Blanchard228e5482011-05-02 20:21:35 +00002987 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002988 case SYS_RECVMSG:
Dominik Brodowskie1834a32018-03-13 20:35:57 +01002989 err = __sys_recvmsg(a0, (struct user_msghdr __user *)a1,
2990 a[2], true);
Stephen Hemminger89bddce2006-09-01 00:19:31 -07002991 break;
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07002992 case SYS_RECVMMSG:
Arnd Bergmann3ca47e92019-04-23 17:43:50 +02002993 if (IS_ENABLED(CONFIG_64BIT))
Arnd Bergmanne11d4282018-04-18 13:43:52 +02002994 err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1,
2995 a[2], a[3],
2996 (struct __kernel_timespec __user *)a[4],
2997 NULL);
2998 else
2999 err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1,
3000 a[2], a[3], NULL,
3001 (struct old_timespec32 __user *)a[4]);
Arnaldo Carvalho de Meloa2e27252009-10-12 23:40:10 -07003002 break;
Ulrich Drepperde11def2008-11-19 15:36:14 -08003003 case SYS_ACCEPT4:
Dominik Brodowski4541e802018-03-13 19:24:23 +01003004 err = __sys_accept4(a0, (struct sockaddr __user *)a1,
3005 (int __user *)a[2], a[3]);
Ulrich Drepperaaca0bd2008-07-23 21:29:20 -07003006 break;
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003007 default:
3008 err = -EINVAL;
3009 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003010 }
3011 return err;
3012}
3013
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003014#endif /* __ARCH_WANT_SYS_SOCKETCALL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003015
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003016/**
3017 * sock_register - add a socket protocol handler
3018 * @ops: description of protocol
3019 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003020 * This function is called by a protocol handler that wants to
3021 * advertise its address family, and have it linked into the
Masanari Iidae793c0f2014-09-04 23:44:36 +09003022 * socket interface. The value ops->family corresponds to the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003023 * socket system call protocol family.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003024 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07003025int sock_register(const struct net_proto_family *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003026{
3027 int err;
3028
3029 if (ops->family >= NPROTO) {
Yang Yingliang3410f222014-02-12 17:09:55 +08003030 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003031 return -ENOBUFS;
3032 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003033
3034 spin_lock(&net_family_lock);
Eric Dumazet190683a2010-11-10 10:50:44 +00003035 if (rcu_dereference_protected(net_families[ops->family],
3036 lockdep_is_held(&net_family_lock)))
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003037 err = -EEXIST;
3038 else {
Eric Dumazetcf778b02012-01-12 04:41:32 +00003039 rcu_assign_pointer(net_families[ops->family], ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003040 err = 0;
3041 }
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003042 spin_unlock(&net_family_lock);
3043
Yejune Dengfe0bdbd2021-06-21 13:12:25 +08003044 pr_info("NET: Registered %s protocol family\n", pf_family_names[ops->family]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003045 return err;
3046}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003047EXPORT_SYMBOL(sock_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003048
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003049/**
3050 * sock_unregister - remove a protocol handler
3051 * @family: protocol family to remove
3052 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003053 * This function is called by a protocol handler that wants to
3054 * remove its address family, and have it unlinked from the
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003055 * new socket creation.
3056 *
3057 * If protocol handler is a module, then it can use module reference
3058 * counts to protect against new references. If protocol handler is not
3059 * a module then it needs to provide its own protection in
3060 * the ops->create routine.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003061 */
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07003062void sock_unregister(int family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003063{
Stephen Hemmingerf0fd27d2006-08-09 21:03:17 -07003064 BUG_ON(family < 0 || family >= NPROTO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003065
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003066 spin_lock(&net_family_lock);
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +00003067 RCU_INIT_POINTER(net_families[family], NULL);
Stephen Hemminger55737fd2006-09-01 00:23:39 -07003068 spin_unlock(&net_family_lock);
3069
3070 synchronize_rcu();
3071
Yejune Dengfe0bdbd2021-06-21 13:12:25 +08003072 pr_info("NET: Unregistered %s protocol family\n", pf_family_names[family]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003073}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003074EXPORT_SYMBOL(sock_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003075
Xin Longbf2ae2e2018-03-10 18:57:50 +08003076bool sock_is_registered(int family)
3077{
Jeremy Cline66b51b02018-08-13 22:23:13 +00003078 return family < NPROTO && rcu_access_pointer(net_families[family]);
Xin Longbf2ae2e2018-03-10 18:57:50 +08003079}
3080
Andi Kleen77d76ea2005-12-22 12:43:42 -08003081static int __init sock_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003082{
Nick Pigginb3e19d92011-01-07 17:50:11 +11003083 int err;
Eric W. Biederman2ca794e2012-04-19 13:20:32 +00003084 /*
3085 * Initialize the network sysctl infrastructure.
3086 */
3087 err = net_sysctl_init();
3088 if (err)
3089 goto out;
Nick Pigginb3e19d92011-01-07 17:50:11 +11003090
Linus Torvalds1da177e2005-04-16 15:20:36 -07003091 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003092 * Initialize skbuff SLAB cache
Linus Torvalds1da177e2005-04-16 15:20:36 -07003093 */
3094 skb_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003095
3096 /*
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003097 * Initialize the protocols module.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003098 */
3099
3100 init_inodecache();
Nick Pigginb3e19d92011-01-07 17:50:11 +11003101
3102 err = register_filesystem(&sock_fs_type);
3103 if (err)
Miaohe Lin47260ba2020-08-06 19:54:19 +08003104 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003105 sock_mnt = kern_mount(&sock_fs_type);
Nick Pigginb3e19d92011-01-07 17:50:11 +11003106 if (IS_ERR(sock_mnt)) {
3107 err = PTR_ERR(sock_mnt);
3108 goto out_mount;
3109 }
Andi Kleen77d76ea2005-12-22 12:43:42 -08003110
3111 /* The real protocol initialization is performed in later initcalls.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003112 */
3113
3114#ifdef CONFIG_NETFILTER
Pablo Neira Ayuso6d11cfd2013-05-22 22:42:36 +00003115 err = netfilter_init();
3116 if (err)
3117 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003118#endif
David S. Millercbeb3212005-12-22 12:58:55 -08003119
Daniel Borkmann408eccc2014-04-01 16:20:23 +02003120 ptp_classifier_init();
Richard Cochranc1f19b52010-07-17 08:49:36 +00003121
Nick Pigginb3e19d92011-01-07 17:50:11 +11003122out:
3123 return err;
3124
3125out_mount:
3126 unregister_filesystem(&sock_fs_type);
Nick Pigginb3e19d92011-01-07 17:50:11 +11003127 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003128}
3129
Andi Kleen77d76ea2005-12-22 12:43:42 -08003130core_initcall(sock_init); /* early initcall */
3131
Linus Torvalds1da177e2005-04-16 15:20:36 -07003132#ifdef CONFIG_PROC_FS
3133void socket_seq_show(struct seq_file *seq)
3134{
Tonghao Zhang648845a2017-12-14 05:51:58 -08003135 seq_printf(seq, "sockets: used %d\n",
3136 sock_inuse_get(seq->private));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003137}
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003138#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003139
Arnd Bergmann29c49642021-07-22 16:29:03 +02003140/* Handle the fact that while struct ifreq has the same *layout* on
3141 * 32/64 for everything but ifreq::ifru_ifmap and ifreq::ifru_data,
3142 * which are handled elsewhere, it still has different *size* due to
3143 * ifreq::ifru_ifmap (which is 16 bytes on 32 bit, 24 bytes on 64-bit,
3144 * resulting in struct ifreq being 32 and 40 bytes respectively).
3145 * As a result, if the struct happens to be at the end of a page and
3146 * the next page isn't readable/writable, we get a fault. To prevent
3147 * that, copy back and forth to the full size.
3148 */
3149int get_user_ifreq(struct ifreq *ifr, void __user **ifrdata, void __user *arg)
3150{
3151 if (in_compat_syscall()) {
3152 struct compat_ifreq *ifr32 = (struct compat_ifreq *)ifr;
3153
3154 memset(ifr, 0, sizeof(*ifr));
3155 if (copy_from_user(ifr32, arg, sizeof(*ifr32)))
3156 return -EFAULT;
3157
3158 if (ifrdata)
3159 *ifrdata = compat_ptr(ifr32->ifr_data);
3160
3161 return 0;
3162 }
3163
3164 if (copy_from_user(ifr, arg, sizeof(*ifr)))
3165 return -EFAULT;
3166
3167 if (ifrdata)
3168 *ifrdata = ifr->ifr_data;
3169
3170 return 0;
3171}
3172EXPORT_SYMBOL(get_user_ifreq);
3173
3174int put_user_ifreq(struct ifreq *ifr, void __user *arg)
3175{
3176 size_t size = sizeof(*ifr);
3177
3178 if (in_compat_syscall())
3179 size = sizeof(struct compat_ifreq);
3180
3181 if (copy_to_user(arg, ifr, size))
3182 return -EFAULT;
3183
3184 return 0;
3185}
3186EXPORT_SYMBOL(put_user_ifreq);
3187
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003188#ifdef CONFIG_COMPAT
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003189static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
3190{
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003191 compat_uptr_t uptr32;
Al Viro44c02a22017-10-05 12:59:44 -04003192 struct ifreq ifr;
3193 void __user *saved;
3194 int err;
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003195
Arnd Bergmann29c49642021-07-22 16:29:03 +02003196 if (get_user_ifreq(&ifr, NULL, uifr32))
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003197 return -EFAULT;
3198
3199 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
3200 return -EFAULT;
3201
Al Viro44c02a22017-10-05 12:59:44 -04003202 saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc;
3203 ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr32);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003204
Arnd Bergmanna554bf92021-07-27 15:45:12 +02003205 err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL, NULL);
Al Viro44c02a22017-10-05 12:59:44 -04003206 if (!err) {
3207 ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved;
Arnd Bergmann29c49642021-07-22 16:29:03 +02003208 if (put_user_ifreq(&ifr, uifr32))
Al Viro44c02a22017-10-05 12:59:44 -04003209 err = -EFAULT;
Joe Perchesccbd6a52010-05-14 10:58:26 +00003210 }
Al Viro44c02a22017-10-05 12:59:44 -04003211 return err;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003212}
3213
Ben Hutchings590d4692013-11-18 17:04:13 +00003214/* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
3215static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
Arnd Bergmann6b960182009-11-06 23:10:54 -08003216 struct compat_ifreq __user *u_ifreq32)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003217{
Al Viro44c02a22017-10-05 12:59:44 -04003218 struct ifreq ifreq;
Arnd Bergmanna554bf92021-07-27 15:45:12 +02003219 void __user *data;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003220
Arnd Bergmanna554bf92021-07-27 15:45:12 +02003221 if (get_user_ifreq(&ifreq, &data, u_ifreq32))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003222 return -EFAULT;
Arnd Bergmanna554bf92021-07-27 15:45:12 +02003223 ifreq.ifr_data = data;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003224
Arnd Bergmanna554bf92021-07-27 15:45:12 +02003225 return dev_ioctl(net, cmd, &ifreq, data, NULL);
Johannes Berg37ac39b2019-01-25 22:43:18 +01003226}
3227
Arnd Bergmann7a229382009-11-06 23:00:29 -08003228/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3229 * for some operations; this forces use of the newer bridge-utils that
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003230 * use compatible ioctls
Arnd Bergmann7a229382009-11-06 23:00:29 -08003231 */
Arnd Bergmann6b960182009-11-06 23:10:54 -08003232static int old_bridge_ioctl(compat_ulong_t __user *argp)
Arnd Bergmann7a229382009-11-06 23:00:29 -08003233{
Arnd Bergmann6b960182009-11-06 23:10:54 -08003234 compat_ulong_t tmp;
Arnd Bergmann7a229382009-11-06 23:00:29 -08003235
Arnd Bergmann6b960182009-11-06 23:10:54 -08003236 if (get_user(tmp, argp))
Arnd Bergmann7a229382009-11-06 23:00:29 -08003237 return -EFAULT;
3238 if (tmp == BRCTL_GET_VERSION)
3239 return BRCTL_VERSION + 1;
3240 return -EINVAL;
3241}
3242
Arnd Bergmann6b960182009-11-06 23:10:54 -08003243static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3244 unsigned int cmd, unsigned long arg)
3245{
3246 void __user *argp = compat_ptr(arg);
3247 struct sock *sk = sock->sk;
3248 struct net *net = sock_net(sk);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003249
Arnd Bergmann6b960182009-11-06 23:10:54 -08003250 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
Arnd Bergmann88fc0232021-07-27 15:45:15 +02003251 return sock_ioctl(file, cmd, (unsigned long)argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003252
Arnd Bergmann6b960182009-11-06 23:10:54 -08003253 switch (cmd) {
3254 case SIOCSIFBR:
3255 case SIOCGIFBR:
3256 return old_bridge_ioctl(argp);
Arnd Bergmann7a50a242009-11-08 20:57:03 -08003257 case SIOCWANDEV:
3258 return compat_siocwandev(net, argp);
Arnd Bergmann0768e172019-04-17 22:56:11 +02003259 case SIOCGSTAMP_OLD:
3260 case SIOCGSTAMPNS_OLD:
Arnd Bergmannc7cbdbf2019-04-17 22:51:48 +02003261 if (!sock->ops->gettstamp)
3262 return -ENOIOCTLCMD;
Arnd Bergmann0768e172019-04-17 22:56:11 +02003263 return sock->ops->gettstamp(sock, argp, cmd == SIOCGSTAMP_OLD,
Arnd Bergmannc7cbdbf2019-04-17 22:51:48 +02003264 !COMPAT_USE_64BIT_TIME);
3265
Arnd Bergmanndd98d282021-07-22 16:28:59 +02003266 case SIOCETHTOOL:
Ben Hutchings590d4692013-11-18 17:04:13 +00003267 case SIOCBONDSLAVEINFOQUERY:
3268 case SIOCBONDINFOQUERY:
Arnd Bergmanna2116ed2009-11-11 03:39:40 +00003269 case SIOCSHWTSTAMP:
Ben Hutchingsfd468c72013-11-14 01:19:29 +00003270 case SIOCGHWTSTAMP:
Ben Hutchings590d4692013-11-18 17:04:13 +00003271 return compat_ifr_data_ioctl(net, cmd, argp);
Arnd Bergmann7a229382009-11-06 23:00:29 -08003272
Arnd Bergmann6b960182009-11-06 23:10:54 -08003273 case FIOSETOWN:
3274 case SIOCSPGRP:
3275 case FIOGETOWN:
3276 case SIOCGPGRP:
3277 case SIOCBRADDBR:
3278 case SIOCBRDELBR:
3279 case SIOCGIFVLAN:
3280 case SIOCSIFVLAN:
Andrey Vaginc62cce22016-10-24 18:29:13 -07003281 case SIOCGSKNS:
Arnd Bergmann0768e172019-04-17 22:56:11 +02003282 case SIOCGSTAMP_NEW:
3283 case SIOCGSTAMPNS_NEW:
Arnd Bergmann876f0bf2021-07-22 16:29:02 +02003284 case SIOCGIFCONF:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003285 return sock_ioctl(file, cmd, arg);
3286
3287 case SIOCGIFFLAGS:
3288 case SIOCSIFFLAGS:
Arnd Bergmann709566d2021-07-22 16:29:00 +02003289 case SIOCGIFMAP:
3290 case SIOCSIFMAP:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003291 case SIOCGIFMETRIC:
3292 case SIOCSIFMETRIC:
3293 case SIOCGIFMTU:
3294 case SIOCSIFMTU:
3295 case SIOCGIFMEM:
3296 case SIOCSIFMEM:
3297 case SIOCGIFHWADDR:
3298 case SIOCSIFHWADDR:
3299 case SIOCADDMULTI:
3300 case SIOCDELMULTI:
3301 case SIOCGIFINDEX:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003302 case SIOCGIFADDR:
3303 case SIOCSIFADDR:
3304 case SIOCSIFHWBROADCAST:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003305 case SIOCDIFADDR:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003306 case SIOCGIFBRDADDR:
3307 case SIOCSIFBRDADDR:
3308 case SIOCGIFDSTADDR:
3309 case SIOCSIFDSTADDR:
3310 case SIOCGIFNETMASK:
3311 case SIOCSIFNETMASK:
3312 case SIOCSIFPFLAGS:
3313 case SIOCGIFPFLAGS:
3314 case SIOCGIFTXQLEN:
3315 case SIOCSIFTXQLEN:
3316 case SIOCBRADDIF:
3317 case SIOCBRDELIF:
Johannes Bergc6c9fee2019-01-25 22:43:19 +01003318 case SIOCGIFNAME:
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003319 case SIOCSIFNAME:
3320 case SIOCGMIIPHY:
3321 case SIOCGMIIREG:
3322 case SIOCSMIIREG:
Al Virof92d4fc2017-09-30 19:32:17 -04003323 case SIOCBONDENSLAVE:
3324 case SIOCBONDRELEASE:
3325 case SIOCBONDSETHWADDR:
3326 case SIOCBONDCHANGEACTIVE:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003327 case SIOCSARP:
3328 case SIOCGARP:
3329 case SIOCDARP:
Arnd Bergmannc7dc5042019-06-03 23:07:12 +02003330 case SIOCOUTQ:
Arnd Bergmann9d7bf412019-06-03 23:06:00 +02003331 case SIOCOUTQNSD:
Arnd Bergmann6b960182009-11-06 23:10:54 -08003332 case SIOCATMARK:
Johannes Berg63ff03a2019-01-25 22:43:17 +01003333 return sock_do_ioctl(net, sock, cmd, arg);
Arnd Bergmann9177efd2009-11-06 08:09:09 +00003334 }
3335
Arnd Bergmann6b960182009-11-06 23:10:54 -08003336 return -ENOIOCTLCMD;
3337}
Arnd Bergmann7a229382009-11-06 23:00:29 -08003338
Eric Dumazet95c96172012-04-15 05:58:06 +00003339static long compat_sock_ioctl(struct file *file, unsigned int cmd,
Stephen Hemminger89bddce2006-09-01 00:19:31 -07003340 unsigned long arg)
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003341{
3342 struct socket *sock = file->private_data;
3343 int ret = -ENOIOCTLCMD;
David S. Miller87de87d2008-06-03 09:14:03 -07003344 struct sock *sk;
3345 struct net *net;
3346
3347 sk = sock->sk;
3348 net = sock_net(sk);
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003349
3350 if (sock->ops->compat_ioctl)
3351 ret = sock->ops->compat_ioctl(sock, cmd, arg);
3352
David S. Miller87de87d2008-06-03 09:14:03 -07003353 if (ret == -ENOIOCTLCMD &&
3354 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3355 ret = compat_wext_handle_ioctl(net, cmd, arg);
3356
Arnd Bergmann6b960182009-11-06 23:10:54 -08003357 if (ret == -ENOIOCTLCMD)
3358 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3359
Shaun Pereira89bbfc92006-03-21 23:58:08 -08003360 return ret;
3361}
3362#endif
3363
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003364/**
3365 * kernel_bind - bind an address to a socket (kernel space)
3366 * @sock: socket
3367 * @addr: address
3368 * @addrlen: length of address
3369 *
3370 * Returns 0 or an error.
3371 */
3372
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003373int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3374{
3375 return sock->ops->bind(sock, addr, addrlen);
3376}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003377EXPORT_SYMBOL(kernel_bind);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003378
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003379/**
3380 * kernel_listen - move socket to listening state (kernel space)
3381 * @sock: socket
3382 * @backlog: pending connections queue size
3383 *
3384 * Returns 0 or an error.
3385 */
3386
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003387int kernel_listen(struct socket *sock, int backlog)
3388{
3389 return sock->ops->listen(sock, backlog);
3390}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003391EXPORT_SYMBOL(kernel_listen);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003392
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003393/**
3394 * kernel_accept - accept a connection (kernel space)
3395 * @sock: listening socket
3396 * @newsock: new connected socket
3397 * @flags: flags
3398 *
3399 * @flags must be SOCK_CLOEXEC, SOCK_NONBLOCK or 0.
3400 * If it fails, @newsock is guaranteed to be %NULL.
3401 * Returns 0 or an error.
3402 */
3403
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003404int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3405{
3406 struct sock *sk = sock->sk;
3407 int err;
3408
3409 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3410 newsock);
3411 if (err < 0)
3412 goto done;
3413
David Howellscdfbabf2017-03-09 08:09:05 +00003414 err = sock->ops->accept(sock, *newsock, flags, true);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003415 if (err < 0) {
3416 sock_release(*newsock);
Tony Battersbyfa8705b2007-10-10 21:09:04 -07003417 *newsock = NULL;
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003418 goto done;
3419 }
3420
3421 (*newsock)->ops = sock->ops;
Wei Yongjun1b085342008-12-18 19:35:10 -08003422 __module_get((*newsock)->ops->owner);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003423
3424done:
3425 return err;
3426}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003427EXPORT_SYMBOL(kernel_accept);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003428
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003429/**
3430 * kernel_connect - connect a socket (kernel space)
3431 * @sock: socket
3432 * @addr: address
3433 * @addrlen: address length
3434 * @flags: flags (O_NONBLOCK, ...)
3435 *
Lu Weif1dcffc2021-03-25 11:01:55 +08003436 * For datagram sockets, @addr is the address to which datagrams are sent
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003437 * by default, and the only address from which datagrams are received.
3438 * For stream sockets, attempts to connect to @addr.
3439 * Returns 0 or an error code.
3440 */
3441
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003442int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
YOSHIFUJI Hideaki4768fbc2007-02-09 23:25:31 +09003443 int flags)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003444{
3445 return sock->ops->connect(sock, addr, addrlen, flags);
3446}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003447EXPORT_SYMBOL(kernel_connect);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003448
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003449/**
3450 * kernel_getsockname - get the address which the socket is bound (kernel space)
3451 * @sock: socket
3452 * @addr: address holder
3453 *
3454 * Fills the @addr pointer with the address which the socket is bound.
3455 * Returns 0 or an error code.
3456 */
3457
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003458int kernel_getsockname(struct socket *sock, struct sockaddr *addr)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003459{
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003460 return sock->ops->getname(sock, addr, 0);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003461}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003462EXPORT_SYMBOL(kernel_getsockname);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003463
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003464/**
Miaohe Lin645f0892020-08-27 07:27:49 -04003465 * kernel_getpeername - get the address which the socket is connected (kernel space)
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003466 * @sock: socket
3467 * @addr: address holder
3468 *
3469 * Fills the @addr pointer with the address which the socket is connected.
3470 * Returns 0 or an error code.
3471 */
3472
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003473int kernel_getpeername(struct socket *sock, struct sockaddr *addr)
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003474{
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01003475 return sock->ops->getname(sock, addr, 1);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003476}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003477EXPORT_SYMBOL(kernel_getpeername);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003478
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003479/**
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003480 * kernel_sendpage - send a &page through a socket (kernel space)
3481 * @sock: socket
3482 * @page: page
3483 * @offset: page offset
3484 * @size: total size in bytes
3485 * @flags: flags (MSG_DONTWAIT, ...)
3486 *
3487 * Returns the total amount sent in bytes or an error.
3488 */
3489
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003490int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3491 size_t size, int flags)
3492{
Coly Li7b62d312020-10-02 16:27:29 +08003493 if (sock->ops->sendpage) {
3494 /* Warn in case the improper page to zero-copy send */
3495 WARN_ONCE(!sendpage_ok(page), "improper page for zero-copy send");
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003496 return sock->ops->sendpage(sock, page, offset, size, flags);
Coly Li7b62d312020-10-02 16:27:29 +08003497 }
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003498 return sock_no_sendpage(sock, page, offset, size, flags);
3499}
Eric Dumazetc6d409c2010-06-03 20:03:40 -07003500EXPORT_SYMBOL(kernel_sendpage);
Sridhar Samudralaac5a4882006-08-07 20:57:31 -07003501
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003502/**
3503 * kernel_sendpage_locked - send a &page through the locked sock (kernel space)
3504 * @sk: sock
3505 * @page: page
3506 * @offset: page offset
3507 * @size: total size in bytes
3508 * @flags: flags (MSG_DONTWAIT, ...)
3509 *
3510 * Returns the total amount sent in bytes or an error.
3511 * Caller must hold @sk.
3512 */
3513
Tom Herbert306b13e2017-07-28 16:22:41 -07003514int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset,
3515 size_t size, int flags)
3516{
3517 struct socket *sock = sk->sk_socket;
3518
3519 if (sock->ops->sendpage_locked)
3520 return sock->ops->sendpage_locked(sk, page, offset, size,
3521 flags);
3522
3523 return sock_no_sendpage_locked(sk, page, offset, size, flags);
3524}
3525EXPORT_SYMBOL(kernel_sendpage_locked);
3526
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003527/**
Miaohe Lin645f0892020-08-27 07:27:49 -04003528 * kernel_sock_shutdown - shut down part of a full-duplex connection (kernel space)
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003529 * @sock: socket
3530 * @how: connection part
3531 *
3532 * Returns 0 or an error.
3533 */
3534
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003535int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3536{
3537 return sock->ops->shutdown(sock, how);
3538}
Trond Myklebust91cf45f2007-11-12 18:10:39 -08003539EXPORT_SYMBOL(kernel_sock_shutdown);
R. Parameswaran113c3072017-04-05 16:50:35 -07003540
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003541/**
3542 * kernel_sock_ip_overhead - returns the IP overhead imposed by a socket
3543 * @sk: socket
3544 *
3545 * This routine returns the IP overhead imposed by a socket i.e.
3546 * the length of the underlying IP header, depending on whether
3547 * this is an IPv4 or IPv6 socket and the length from IP options turned
3548 * on at the socket. Assumes that the caller has a lock on the socket.
R. Parameswaran113c3072017-04-05 16:50:35 -07003549 */
Pedro Tammela8a3c2452019-03-14 10:45:23 -03003550
R. Parameswaran113c3072017-04-05 16:50:35 -07003551u32 kernel_sock_ip_overhead(struct sock *sk)
3552{
3553 struct inet_sock *inet;
3554 struct ip_options_rcu *opt;
3555 u32 overhead = 0;
R. Parameswaran113c3072017-04-05 16:50:35 -07003556#if IS_ENABLED(CONFIG_IPV6)
3557 struct ipv6_pinfo *np;
3558 struct ipv6_txoptions *optv6 = NULL;
3559#endif /* IS_ENABLED(CONFIG_IPV6) */
3560
3561 if (!sk)
3562 return overhead;
3563
R. Parameswaran113c3072017-04-05 16:50:35 -07003564 switch (sk->sk_family) {
3565 case AF_INET:
3566 inet = inet_sk(sk);
3567 overhead += sizeof(struct iphdr);
3568 opt = rcu_dereference_protected(inet->inet_opt,
stephen hemminger614d79c2017-07-24 10:25:22 -07003569 sock_owned_by_user(sk));
R. Parameswaran113c3072017-04-05 16:50:35 -07003570 if (opt)
3571 overhead += opt->opt.optlen;
3572 return overhead;
3573#if IS_ENABLED(CONFIG_IPV6)
3574 case AF_INET6:
3575 np = inet6_sk(sk);
3576 overhead += sizeof(struct ipv6hdr);
3577 if (np)
3578 optv6 = rcu_dereference_protected(np->opt,
stephen hemminger614d79c2017-07-24 10:25:22 -07003579 sock_owned_by_user(sk));
R. Parameswaran113c3072017-04-05 16:50:35 -07003580 if (optv6)
3581 overhead += (optv6->opt_flen + optv6->opt_nflen);
3582 return overhead;
3583#endif /* IS_ENABLED(CONFIG_IPV6) */
3584 default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */
3585 return overhead;
3586 }
3587}
3588EXPORT_SYMBOL(kernel_sock_ip_overhead);