1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
|
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_NET_AFUNIX_H
#define __LINUX_NET_AFUNIX_H
#include <linux/socket.h>
#include <linux/un.h>
#include <linux/mutex.h>
#include <linux/refcount.h>
#include <net/sock.h>
void unix_inflight(struct user_struct *user, struct file *fp);
void unix_notinflight(struct user_struct *user, struct file *fp);
void unix_destruct_scm(struct sk_buff *skb);
void unix_gc(void);
void wait_for_unix_gc(void);
struct sock *unix_get_socket(struct file *filp);
struct sock *unix_peer_get(struct sock *sk);
#define UNIX_HASH_MOD (256 - 1)
#define UNIX_HASH_SIZE (256 * 2)
#define UNIX_HASH_BITS 8
extern unsigned int unix_tot_inflight;
struct unix_address {
refcount_t refcnt;
int len;
struct sockaddr_un name[];
};
struct unix_skb_parms {
struct pid *pid; /* Skb credentials */
kuid_t uid;
kgid_t gid;
struct scm_fp_list *fp; /* Passed files */
#ifdef CONFIG_SECURITY_NETWORK
u32 secid; /* Security ID */
#endif
u32 consumed;
} __randomize_layout;
struct scm_stat {
atomic_t nr_fds;
};
#define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb))
/* The AF_UNIX socket */
struct unix_sock {
/* WARNING: sk has to be the first member */
struct sock sk;
struct unix_address *addr;
struct path path;
struct mutex iolock, bindlock;
struct sock *peer;
struct list_head link;
unsigned long inflight;
spinlock_t lock;
unsigned long gc_flags;
#define UNIX_GC_CANDIDATE 0
#define UNIX_GC_MAYBE_CYCLE 1
struct socket_wq peer_wq;
wait_queue_entry_t peer_wake;
struct scm_stat scm_stat;
#if IS_ENABLED(CONFIG_AF_UNIX_OOB)
struct sk_buff *oob_skb;
#endif
};
static inline struct unix_sock *unix_sk(const struct sock *sk)
{
return (struct unix_sock *)sk;
}
#define unix_peer(sk) (unix_sk(sk)->peer)
#define unix_state_lock(s) spin_lock(&unix_sk(s)->lock)
#define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock)
enum unix_socket_lock_class {
U_LOCK_NORMAL,
U_LOCK_SECOND, /* for double locking, see unix_state_double_lock(). */
U_LOCK_DIAG, /* used while dumping icons, see sk_diag_dump_icons(). */
U_LOCK_GC_LISTENER, /* used for listening socket while determining gc
* candidates to close a small race window.
*/
};
static inline void unix_state_lock_nested(struct sock *sk,
enum unix_socket_lock_class subclass)
{
spin_lock_nested(&unix_sk(sk)->lock, subclass);
}
#define peer_wait peer_wq.wait
long unix_inq_len(struct sock *sk);
long unix_outq_len(struct sock *sk);
int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
int flags);
int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
int flags);
#ifdef CONFIG_SYSCTL
int unix_sysctl_register(struct net *net);
void unix_sysctl_unregister(struct net *net);
#else
static inline int unix_sysctl_register(struct net *net) { return 0; }
static inline void unix_sysctl_unregister(struct net *net) {}
#endif
#ifdef CONFIG_BPF_SYSCALL
extern struct proto unix_dgram_proto;
extern struct proto unix_stream_proto;
int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
void __init unix_bpf_build_proto(void);
#else
static inline void __init unix_bpf_build_proto(void)
{}
#endif
#endif
|
