af_unix.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef __LINUX_NET_AFUNIX_H
 3#define __LINUX_NET_AFUNIX_H
 4
 5#include <linux/atomic.h>
 6#include <linux/mutex.h>
 7#include <linux/net.h>
 8#include <linux/path.h>
 9#include <linux/refcount.h>
10#include <linux/spinlock.h>
11#include <linux/wait.h>
12#include <net/sock.h>
13#include <uapi/linux/un.h>
14
15#if IS_ENABLED(CONFIG_UNIX)
16struct unix_sock *unix_get_socket(struct file *filp);
17#else
18static inline struct unix_sock *unix_get_socket(struct file *filp)
19{
20	return NULL;
21}
22#endif
23
24struct unix_address {
25	refcount_t	refcnt;
26	int		len;
27	struct sockaddr_un name[];
28};
29
30struct scm_stat {
31	atomic_t nr_fds;
32	unsigned long nr_unix_fds;
33};
34
35/* The AF_UNIX socket */
36struct unix_sock {
37	/* WARNING: sk has to be the first member */
38	struct sock		sk;
39	struct unix_address	*addr;
40	struct path		path;
41	struct mutex		iolock, bindlock;
42	struct sock		*peer;
43	struct sock		*listener;
44	struct unix_vertex	*vertex;
45	spinlock_t		lock;
46	struct socket_wq	peer_wq;
47#define peer_wait		peer_wq.wait
48	wait_queue_entry_t	peer_wake;
49	struct scm_stat		scm_stat;
50	int			inq_len;
51	bool			recvmsg_inq;
52#if IS_ENABLED(CONFIG_AF_UNIX_OOB)
53	struct sk_buff		*oob_skb;
54#endif
55};
56
57#define unix_sk(ptr) container_of_const(ptr, struct unix_sock, sk)
58#define unix_peer(sk) (unix_sk(sk)->peer)
59
60#define unix_state_lock(s)	spin_lock(&unix_sk(s)->lock)
61#define unix_state_unlock(s)	spin_unlock(&unix_sk(s)->lock)
62
63#endif