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Linux kernel mirror (for testing)
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kernel
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linux
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 io_uring_destruct_scm(struct sk_buff *skb);
15void unix_gc(void);
16void wait_for_unix_gc(void);
17struct sock *unix_get_socket(struct file *filp);
18struct sock *unix_peer_get(struct sock *sk);
19
20#define UNIX_HASH_MOD (256 - 1)
21#define UNIX_HASH_SIZE (256 * 2)
22#define UNIX_HASH_BITS 8
23
24extern unsigned int unix_tot_inflight;
25
26struct unix_address {
27 refcount_t refcnt;
28 int len;
29 struct sockaddr_un name[];
30};
31
32struct unix_skb_parms {
33 struct pid *pid; /* Skb credentials */
34 kuid_t uid;
35 kgid_t gid;
36 struct scm_fp_list *fp; /* Passed files */
37#ifdef CONFIG_SECURITY_NETWORK
38 u32 secid; /* Security ID */
39#endif
40 u32 consumed;
41} __randomize_layout;
42
43struct scm_stat {
44 atomic_t nr_fds;
45};
46
47#define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb))
48
49#define unix_state_lock(s) spin_lock(&unix_sk(s)->lock)
50#define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock)
51#define unix_state_lock_nested(s) \
52 spin_lock_nested(&unix_sk(s)->lock, \
53 SINGLE_DEPTH_NESTING)
54
55/* The AF_UNIX socket */
56struct unix_sock {
57 /* WARNING: sk has to be the first member */
58 struct sock sk;
59 struct unix_address *addr;
60 struct path path;
61 struct mutex iolock, bindlock;
62 struct sock *peer;
63 struct list_head link;
64 atomic_long_t inflight;
65 spinlock_t lock;
66 unsigned long gc_flags;
67#define UNIX_GC_CANDIDATE 0
68#define UNIX_GC_MAYBE_CYCLE 1
69 struct socket_wq peer_wq;
70 wait_queue_entry_t peer_wake;
71 struct scm_stat scm_stat;
72#if IS_ENABLED(CONFIG_AF_UNIX_OOB)
73 struct sk_buff *oob_skb;
74#endif
75};
76
77#define unix_sk(ptr) container_of_const(ptr, struct unix_sock, sk)
78#define unix_peer(sk) (unix_sk(sk)->peer)
79
80#define peer_wait peer_wq.wait
81
82long unix_inq_len(struct sock *sk);
83long unix_outq_len(struct sock *sk);
84
85int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
86 int flags);
87int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
88 int flags);
89#ifdef CONFIG_SYSCTL
90int unix_sysctl_register(struct net *net);
91void unix_sysctl_unregister(struct net *net);
92#else
93static inline int unix_sysctl_register(struct net *net) { return 0; }
94static inline void unix_sysctl_unregister(struct net *net) {}
95#endif
96
97#ifdef CONFIG_BPF_SYSCALL
98extern struct proto unix_dgram_proto;
99extern struct proto unix_stream_proto;
100
101int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
102int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
103void __init unix_bpf_build_proto(void);
104#else
105static inline void __init unix_bpf_build_proto(void)
106{}
107#endif
108#endif