tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
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 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[];
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
44struct scm_stat {
45 atomic_t nr_fds;
46};
47
48#define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb))
49
50#define unix_state_lock(s) spin_lock(&unix_sk(s)->lock)
51#define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock)
52#define unix_state_lock_nested(s) \
53 spin_lock_nested(&unix_sk(s)->lock, \
54 SINGLE_DEPTH_NESTING)
55
56/* The AF_UNIX socket */
57struct unix_sock {
58 /* WARNING: sk has to be the first member */
59 struct sock sk;
60 struct unix_address *addr;
61 struct path path;
62 struct mutex iolock, bindlock;
63 struct sock *peer;
64 struct list_head link;
65 atomic_long_t inflight;
66 spinlock_t lock;
67 unsigned long gc_flags;
68#define UNIX_GC_CANDIDATE 0
69#define UNIX_GC_MAYBE_CYCLE 1
70 struct socket_wq peer_wq;
71 wait_queue_entry_t peer_wake;
72 struct scm_stat scm_stat;
73#if IS_ENABLED(CONFIG_AF_UNIX_OOB)
74 struct sk_buff *oob_skb;
75#endif
76};
77
78static inline struct unix_sock *unix_sk(const struct sock *sk)
79{
80 return (struct unix_sock *)sk;
81}
82
83#define peer_wait peer_wq.wait
84
85long unix_inq_len(struct sock *sk);
86long unix_outq_len(struct sock *sk);
87
88int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
89 int flags);
90int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
91 int flags);
92#ifdef CONFIG_SYSCTL
93int unix_sysctl_register(struct net *net);
94void unix_sysctl_unregister(struct net *net);
95#else
96static inline int unix_sysctl_register(struct net *net) { return 0; }
97static inline void unix_sysctl_unregister(struct net *net) {}
98#endif
99
100#ifdef CONFIG_BPF_SYSCALL
101extern struct proto unix_dgram_proto;
102extern struct proto unix_stream_proto;
103
104int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
105int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
106void __init unix_bpf_build_proto(void);
107#else
108static inline void __init unix_bpf_build_proto(void)
109{}
110#endif
111#endif