1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LINUX_NET_AFUNIX_H
3 #define __LINUX_NET_AFUNIX_H
5 #include <linux/socket.h>
7 #include <linux/mutex.h>
8 #include <linux/refcount.h>
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);
15 void wait_for_unix_gc(void);
16 struct sock *unix_get_socket(struct file *filp);
17 struct sock *unix_peer_get(struct sock *sk);
19 #define UNIX_HASH_SIZE 256
20 #define UNIX_HASH_BITS 8
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];
30 struct sockaddr_un name[];
33 struct unix_skb_parms {
34 struct pid *pid; /* Skb credentials */
37 struct scm_fp_list *fp; /* Passed files */
38 #ifdef CONFIG_SECURITY_NETWORK
39 u32 secid; /* Security ID */
48 #define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb))
50 /* The AF_UNIX socket */
52 /* WARNING: sk has to be the first member */
54 struct unix_address *addr;
56 struct mutex iolock, bindlock;
58 struct list_head link;
59 unsigned long inflight;
61 unsigned long gc_flags;
62 #define UNIX_GC_CANDIDATE 0
63 #define UNIX_GC_MAYBE_CYCLE 1
64 struct socket_wq peer_wq;
65 wait_queue_entry_t peer_wake;
66 struct scm_stat scm_stat;
69 static inline struct unix_sock *unix_sk(const struct sock *sk)
71 return (struct unix_sock *)sk;
74 #define unix_state_lock(s) spin_lock(&unix_sk(s)->lock)
75 #define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock)
76 enum unix_socket_lock_class {
78 U_LOCK_SECOND, /* for double locking, see unix_state_double_lock(). */
79 U_LOCK_DIAG, /* used while dumping icons, see sk_diag_dump_icons(). */
80 U_LOCK_GC_LISTENER, /* used for listening socket while determining gc
81 * candidates to close a small race window.
85 static inline void unix_state_lock_nested(struct sock *sk,
86 enum unix_socket_lock_class subclass)
88 spin_lock_nested(&unix_sk(sk)->lock, subclass);
91 #define peer_wait peer_wq.wait
93 long unix_inq_len(struct sock *sk);
94 long unix_outq_len(struct sock *sk);
97 int unix_sysctl_register(struct net *net);
98 void unix_sysctl_unregister(struct net *net);
100 static inline int unix_sysctl_register(struct net *net) { return 0; }
101 static inline void unix_sysctl_unregister(struct net *net) {}