xref: /linux/include/net/af_unix.h (revision 4413e16d9d21673bb5048a2e542f1aaa00015c2e)
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 
9 extern void unix_inflight(struct file *fp);
10 extern void unix_notinflight(struct file *fp);
11 extern void unix_gc(void);
12 extern void wait_for_unix_gc(void);
13 extern struct sock *unix_get_socket(struct file *filp);
14 extern struct sock *unix_peer_get(struct sock *);
15 
16 #define UNIX_HASH_SIZE	256
17 #define UNIX_HASH_BITS	8
18 
19 extern unsigned int unix_tot_inflight;
20 extern spinlock_t unix_table_lock;
21 extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE];
22 
23 struct unix_address {
24 	atomic_t	refcnt;
25 	int		len;
26 	unsigned int	hash;
27 	struct sockaddr_un name[0];
28 };
29 
30 struct unix_skb_parms {
31 	struct pid		*pid;		/* Skb credentials	*/
32 	const struct cred	*cred;
33 	struct scm_fp_list	*fp;		/* Passed files		*/
34 #ifdef CONFIG_SECURITY_NETWORK
35 	u32			secid;		/* Security ID		*/
36 #endif
37 };
38 
39 #define UNIXCB(skb) 	(*(struct unix_skb_parms *)&((skb)->cb))
40 #define UNIXSID(skb)	(&UNIXCB((skb)).secid)
41 
42 #define unix_state_lock(s)	spin_lock(&unix_sk(s)->lock)
43 #define unix_state_unlock(s)	spin_unlock(&unix_sk(s)->lock)
44 #define unix_state_lock_nested(s) \
45 				spin_lock_nested(&unix_sk(s)->lock, \
46 				SINGLE_DEPTH_NESTING)
47 
48 /* The AF_UNIX socket */
49 struct unix_sock {
50 	/* WARNING: sk has to be the first member */
51 	struct sock		sk;
52 	struct unix_address     *addr;
53 	struct path		path;
54 	struct mutex		readlock;
55 	struct sock		*peer;
56 	struct sock		*other;
57 	struct list_head	link;
58 	atomic_long_t		inflight;
59 	spinlock_t		lock;
60 	unsigned int		gc_candidate : 1;
61 	unsigned int		gc_maybe_cycle : 1;
62 	unsigned char		recursion_level;
63 	struct socket_wq	peer_wq;
64 };
65 #define unix_sk(__sk) ((struct unix_sock *)__sk)
66 
67 #define peer_wait peer_wq.wait
68 
69 long unix_inq_len(struct sock *sk);
70 long unix_outq_len(struct sock *sk);
71 
72 #ifdef CONFIG_SYSCTL
73 extern int unix_sysctl_register(struct net *net);
74 extern void unix_sysctl_unregister(struct net *net);
75 #else
76 static inline int unix_sysctl_register(struct net *net) { return 0; }
77 static inline void unix_sysctl_unregister(struct net *net) {}
78 #endif
79 #endif
80