1#ifndef __LINUX_NET_AFUNIX_H
2#define __LINUX_NET_AFUNIX_H
3
4#include <linux/socket.h>
5#include <linux/un.h>
6#include <linux/mutex.h>
7#include <net/sock.h>
8
9void unix_inflight(struct user_struct *user, struct file *fp);
10void unix_notinflight(struct user_struct *user, struct file *fp);
11void unix_gc(void);
12void wait_for_unix_gc(void);
13struct sock *unix_get_socket(struct file *filp);
14struct sock *unix_peer_get(struct sock *);
15
16#define UNIX_HASH_SIZE	256
17#define UNIX_HASH_BITS	8
18
19extern unsigned int unix_tot_inflight;
20extern spinlock_t unix_table_lock;
21extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE];
22
23struct unix_address {
24	atomic_t	refcnt;
25	int		len;
26	unsigned int	hash;
27	struct sockaddr_un name[0];
28};
29
30struct unix_skb_parms {
31	struct pid		*pid;		/* Skb credentials	*/
32	kuid_t			uid;
33	kgid_t			gid;
34	struct scm_fp_list	*fp;		/* Passed files		*/
35#ifdef CONFIG_SECURITY_NETWORK
36	u32			secid;		/* Security ID		*/
37#endif
38	u32			consumed;
39};
40
41#define UNIXCB(skb) 	(*(struct unix_skb_parms *)&((skb)->cb))
42#define UNIXSID(skb)	(&UNIXCB((skb)).secid)
43
44#define unix_state_lock(s)	spin_lock(&unix_sk(s)->lock)
45#define unix_state_unlock(s)	spin_unlock(&unix_sk(s)->lock)
46#define unix_state_lock_nested(s) \
47				spin_lock_nested(&unix_sk(s)->lock, \
48				SINGLE_DEPTH_NESTING)
49
50/* The AF_UNIX socket */
51struct unix_sock {
52	/* WARNING: sk has to be the first member */
53	struct sock		sk;
54	struct unix_address     *addr;
55	struct path		path;
56	struct mutex		readlock;
57	struct sock		*peer;
58	struct list_head	link;
59	atomic_long_t		inflight;
60	spinlock_t		lock;
61	unsigned char		recursion_level;
62	unsigned long		gc_flags;
63#define UNIX_GC_CANDIDATE	0
64#define UNIX_GC_MAYBE_CYCLE	1
65	struct socket_wq	peer_wq;
66	wait_queue_t		peer_wake;
67};
68
69static inline struct unix_sock *unix_sk(struct sock *sk)
70{
71	return (struct unix_sock *)sk;
72}
73
74#define peer_wait peer_wq.wait
75
76long unix_inq_len(struct sock *sk);
77long unix_outq_len(struct sock *sk);
78
79#ifdef CONFIG_SYSCTL
80int unix_sysctl_register(struct net *net);
81void unix_sysctl_unregister(struct net *net);
82#else
83static inline int unix_sysctl_register(struct net *net) { return 0; }
84static inline void unix_sysctl_unregister(struct net *net) {}
85#endif
86#endif
87