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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
11void unix_inflight(struct user_struct *user, struct file *fp);
12void unix_notinflight(struct user_struct *user, struct file *fp);
13void unix_destruct_scm(struct sk_buff *skb);
14void unix_gc(void);
15void wait_for_unix_gc(void);
16struct sock *unix_get_socket(struct file *filp);
17struct sock *unix_peer_get(struct sock *sk);
18
19#define UNIX_HASH_SIZE 256
20#define UNIX_HASH_BITS 8
21
22extern unsigned int unix_tot_inflight;
23extern spinlock_t unix_table_lock;
24extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE];
25
26struct unix_address {
27 refcount_t refcnt;
28 int len;
29 unsigned int hash;
30 struct sockaddr_un name[0];
31};
32
33struct 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 */
53struct 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
70static 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
77long unix_inq_len(struct sock *sk);
78long unix_outq_len(struct sock *sk);
79
80#ifdef CONFIG_SYSCTL
81int unix_sysctl_register(struct net *net);
82void unix_sysctl_unregister(struct net *net);
83#else
84static inline int unix_sysctl_register(struct net *net) { return 0; }
85static inline void unix_sysctl_unregister(struct net *net) {}
86#endif
87#endif
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#if IS_ENABLED(CONFIG_UNIX)
12struct unix_sock *unix_get_socket(struct file *filp);
13#else
14static inline struct unix_sock *unix_get_socket(struct file *filp)
15{
16 return NULL;
17}
18#endif
19
20extern spinlock_t unix_gc_lock;
21extern unsigned int unix_tot_inflight;
22
23void unix_inflight(struct user_struct *user, struct file *fp);
24void unix_notinflight(struct user_struct *user, struct file *fp);
25void unix_gc(void);
26void wait_for_unix_gc(struct scm_fp_list *fpl);
27
28struct sock *unix_peer_get(struct sock *sk);
29
30#define UNIX_HASH_MOD (256 - 1)
31#define UNIX_HASH_SIZE (256 * 2)
32#define UNIX_HASH_BITS 8
33
34struct unix_address {
35 refcount_t refcnt;
36 int len;
37 struct sockaddr_un name[];
38};
39
40struct unix_skb_parms {
41 struct pid *pid; /* Skb credentials */
42 kuid_t uid;
43 kgid_t gid;
44 struct scm_fp_list *fp; /* Passed files */
45#ifdef CONFIG_SECURITY_NETWORK
46 u32 secid; /* Security ID */
47#endif
48 u32 consumed;
49} __randomize_layout;
50
51struct scm_stat {
52 atomic_t nr_fds;
53};
54
55#define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb))
56
57/* The AF_UNIX socket */
58struct unix_sock {
59 /* WARNING: sk has to be the first member */
60 struct sock sk;
61 struct unix_address *addr;
62 struct path path;
63 struct mutex iolock, bindlock;
64 struct sock *peer;
65 struct list_head link;
66 unsigned long inflight;
67 spinlock_t lock;
68 unsigned long gc_flags;
69#define UNIX_GC_CANDIDATE 0
70#define UNIX_GC_MAYBE_CYCLE 1
71 struct socket_wq peer_wq;
72 wait_queue_entry_t peer_wake;
73 struct scm_stat scm_stat;
74#if IS_ENABLED(CONFIG_AF_UNIX_OOB)
75 struct sk_buff *oob_skb;
76#endif
77};
78
79#define unix_sk(ptr) container_of_const(ptr, struct unix_sock, sk)
80#define unix_peer(sk) (unix_sk(sk)->peer)
81
82#define unix_state_lock(s) spin_lock(&unix_sk(s)->lock)
83#define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock)
84enum unix_socket_lock_class {
85 U_LOCK_NORMAL,
86 U_LOCK_SECOND, /* for double locking, see unix_state_double_lock(). */
87 U_LOCK_DIAG, /* used while dumping icons, see sk_diag_dump_icons(). */
88 U_LOCK_GC_LISTENER, /* used for listening socket while determining gc
89 * candidates to close a small race window.
90 */
91};
92
93static inline void unix_state_lock_nested(struct sock *sk,
94 enum unix_socket_lock_class subclass)
95{
96 spin_lock_nested(&unix_sk(sk)->lock, subclass);
97}
98
99#define peer_wait peer_wq.wait
100
101long unix_inq_len(struct sock *sk);
102long unix_outq_len(struct sock *sk);
103
104int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
105 int flags);
106int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
107 int flags);
108#ifdef CONFIG_SYSCTL
109int unix_sysctl_register(struct net *net);
110void unix_sysctl_unregister(struct net *net);
111#else
112static inline int unix_sysctl_register(struct net *net) { return 0; }
113static inline void unix_sysctl_unregister(struct net *net) {}
114#endif
115
116#ifdef CONFIG_BPF_SYSCALL
117extern struct proto unix_dgram_proto;
118extern struct proto unix_stream_proto;
119
120int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
121int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
122void __init unix_bpf_build_proto(void);
123#else
124static inline void __init unix_bpf_build_proto(void)
125{}
126#endif
127#endif