1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LINUX_NET_AFUNIX_H
3 #define __LINUX_NET_AFUNIX_H
4 
5 #include <linux/socket.h>
6 #include <linux/un.h>
7 #include <linux/mutex.h>
8 #include <linux/refcount.h>
9 #include <net/sock.h>
10 
11 void unix_inflight(struct user_struct *user, struct file *fp);
12 void unix_notinflight(struct user_struct *user, struct file *fp);
13 void unix_destruct_scm(struct sk_buff *skb);
14 void unix_gc(void);
15 void wait_for_unix_gc(void);
16 struct sock *unix_get_socket(struct file *filp);
17 struct sock *unix_peer_get(struct sock *);
18 
19 #define UNIX_HASH_SIZE	256
20 #define UNIX_HASH_BITS	8
21 
22 extern unsigned int unix_tot_inflight;
23 extern spinlock_t unix_table_lock;
24 extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE];
25 
26 struct unix_address {
27 	refcount_t	refcnt;
28 	int		len;
29 	unsigned int	hash;
30 	struct sockaddr_un name[0];
31 };
32 
33 struct unix_skb_parms {
34 	struct pid		*pid;		/* Skb credentials	*/
35 	kuid_t			uid;
36 	kgid_t			gid;
37 	struct scm_fp_list	*fp;		/* Passed files		*/
38 #ifdef CONFIG_SECURITY_NETWORK
39 	u32			secid;		/* Security ID		*/
40 #endif
41 	u32			consumed;
42 } __randomize_layout;
43 
44 #define UNIXCB(skb) 	(*(struct unix_skb_parms *)&((skb)->cb))
45 
46 #define unix_state_lock(s)	spin_lock(&unix_sk(s)->lock)
47 #define unix_state_unlock(s)	spin_unlock(&unix_sk(s)->lock)
48 #define unix_state_lock_nested(s) \
49 				spin_lock_nested(&unix_sk(s)->lock, \
50 				SINGLE_DEPTH_NESTING)
51 
52 /* The AF_UNIX socket */
53 struct unix_sock {
54 	/* WARNING: sk has to be the first member */
55 	struct sock		sk;
56 	struct unix_address     *addr;
57 	struct path		path;
58 	struct mutex		iolock, bindlock;
59 	struct sock		*peer;
60 	struct list_head	link;
61 	atomic_long_t		inflight;
62 	spinlock_t		lock;
63 	unsigned long		gc_flags;
64 #define UNIX_GC_CANDIDATE	0
65 #define UNIX_GC_MAYBE_CYCLE	1
66 	struct socket_wq	peer_wq;
67 	wait_queue_entry_t		peer_wake;
68 };
69 
unix_sk(const struct sock * sk)70 static inline struct unix_sock *unix_sk(const struct sock *sk)
71 {
72 	return (struct unix_sock *)sk;
73 }
74 
75 #define peer_wait peer_wq.wait
76 
77 long unix_inq_len(struct sock *sk);
78 long unix_outq_len(struct sock *sk);
79 
80 #ifdef CONFIG_SYSCTL
81 int unix_sysctl_register(struct net *net);
82 void unix_sysctl_unregister(struct net *net);
83 #else
unix_sysctl_register(struct net * net)84 static inline int unix_sysctl_register(struct net *net) { return 0; }
unix_sysctl_unregister(struct net * net)85 static inline void unix_sysctl_unregister(struct net *net) {}
86 #endif
87 #endif
88