xref: /openbmc/linux/include/net/af_unix.h (revision 64c70b1c)
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 
13 #define UNIX_HASH_SIZE	256
14 
15 extern struct hlist_head unix_socket_table[UNIX_HASH_SIZE + 1];
16 extern spinlock_t unix_table_lock;
17 
18 extern atomic_t unix_tot_inflight;
19 
20 static inline struct sock *first_unix_socket(int *i)
21 {
22 	for (*i = 0; *i <= UNIX_HASH_SIZE; (*i)++) {
23 		if (!hlist_empty(&unix_socket_table[*i]))
24 			return __sk_head(&unix_socket_table[*i]);
25 	}
26 	return NULL;
27 }
28 
29 static inline struct sock *next_unix_socket(int *i, struct sock *s)
30 {
31 	struct sock *next = sk_next(s);
32 	/* More in this chain? */
33 	if (next)
34 		return next;
35 	/* Look for next non-empty chain. */
36 	for ((*i)++; *i <= UNIX_HASH_SIZE; (*i)++) {
37 		if (!hlist_empty(&unix_socket_table[*i]))
38 			return __sk_head(&unix_socket_table[*i]);
39 	}
40 	return NULL;
41 }
42 
43 #define forall_unix_sockets(i, s) \
44 	for (s = first_unix_socket(&(i)); s; s = next_unix_socket(&(i),(s)))
45 
46 struct unix_address {
47 	atomic_t	refcnt;
48 	int		len;
49 	unsigned	hash;
50 	struct sockaddr_un name[0];
51 };
52 
53 struct unix_skb_parms {
54 	struct ucred		creds;		/* Skb credentials	*/
55 	struct scm_fp_list	*fp;		/* Passed files		*/
56 #ifdef CONFIG_SECURITY_NETWORK
57 	u32			secid;		/* Security ID		*/
58 #endif
59 };
60 
61 #define UNIXCB(skb) 	(*(struct unix_skb_parms*)&((skb)->cb))
62 #define UNIXCREDS(skb)	(&UNIXCB((skb)).creds)
63 #define UNIXSID(skb)	(&UNIXCB((skb)).secid)
64 
65 #define unix_state_lock(s)	spin_lock(&unix_sk(s)->lock)
66 #define unix_state_unlock(s)	spin_unlock(&unix_sk(s)->lock)
67 #define unix_state_lock_nested(s) \
68 				spin_lock_nested(&unix_sk(s)->lock, \
69 				SINGLE_DEPTH_NESTING)
70 
71 #ifdef __KERNEL__
72 /* The AF_UNIX socket */
73 struct unix_sock {
74 	/* WARNING: sk has to be the first member */
75 	struct sock		sk;
76         struct unix_address     *addr;
77         struct dentry		*dentry;
78         struct vfsmount		*mnt;
79 	struct mutex		readlock;
80         struct sock		*peer;
81         struct sock		*other;
82         struct sock		*gc_tree;
83         atomic_t                inflight;
84         spinlock_t		lock;
85         wait_queue_head_t       peer_wait;
86 };
87 #define unix_sk(__sk) ((struct unix_sock *)__sk)
88 
89 #ifdef CONFIG_SYSCTL
90 extern int sysctl_unix_max_dgram_qlen;
91 extern void unix_sysctl_register(void);
92 extern void unix_sysctl_unregister(void);
93 #else
94 static inline void unix_sysctl_register(void) {}
95 static inline void unix_sysctl_unregister(void) {}
96 #endif
97 #endif
98 #endif
99