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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 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/* The AF_UNIX socket */
50struct unix_sock {
51 /* WARNING: sk has to be the first member */
52 struct sock sk;
53 struct unix_address *addr;
54 struct path path;
55 struct mutex iolock, bindlock;
56 struct sock *peer;
57 struct list_head link;
58 atomic_long_t inflight;
59 spinlock_t lock;
60 unsigned long gc_flags;
61#define UNIX_GC_CANDIDATE 0
62#define UNIX_GC_MAYBE_CYCLE 1
63 struct socket_wq peer_wq;
64 wait_queue_entry_t peer_wake;
65 struct scm_stat scm_stat;
66#if IS_ENABLED(CONFIG_AF_UNIX_OOB)
67 struct sk_buff *oob_skb;
68#endif
69};
70
71#define unix_sk(ptr) container_of_const(ptr, struct unix_sock, sk)
72#define unix_peer(sk) (unix_sk(sk)->peer)
73
74#define unix_state_lock(s) spin_lock(&unix_sk(s)->lock)
75#define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock)
76enum unix_socket_lock_class {
77 U_LOCK_NORMAL,
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};
81
82static inline void unix_state_lock_nested(struct sock *sk,
83 enum unix_socket_lock_class subclass)
84{
85 spin_lock_nested(&unix_sk(sk)->lock, subclass);
86}
87
88#define peer_wait peer_wq.wait
89
90long unix_inq_len(struct sock *sk);
91long unix_outq_len(struct sock *sk);
92
93int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
94 int flags);
95int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
96 int flags);
97#ifdef CONFIG_SYSCTL
98int unix_sysctl_register(struct net *net);
99void unix_sysctl_unregister(struct net *net);
100#else
101static inline int unix_sysctl_register(struct net *net) { return 0; }
102static inline void unix_sysctl_unregister(struct net *net) {}
103#endif
104
105#ifdef CONFIG_BPF_SYSCALL
106extern struct proto unix_dgram_proto;
107extern struct proto unix_stream_proto;
108
109int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
110int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
111void __init unix_bpf_build_proto(void);
112#else
113static inline void __init unix_bpf_build_proto(void)
114{}
115#endif
116#endif
1#ifndef __LINUX_NET_AFUNIX_H
2#define __LINUX_NET_AFUNIX_H
3
4#include <linux/socket.h>
5#include <linux/un.h>
6#include <linux/mutex.h>
7#include <net/sock.h>
8
9extern void unix_inflight(struct file *fp);
10extern void unix_notinflight(struct file *fp);
11extern void unix_gc(void);
12extern void wait_for_unix_gc(void);
13extern struct sock *unix_get_socket(struct file *filp);
14extern struct sock *unix_peer_get(struct sock *);
15
16#define UNIX_HASH_SIZE 256
17
18extern unsigned int unix_tot_inflight;
19extern spinlock_t unix_table_lock;
20extern struct hlist_head unix_socket_table[UNIX_HASH_SIZE + 1];
21
22struct unix_address {
23 atomic_t refcnt;
24 int len;
25 unsigned int hash;
26 struct sockaddr_un name[0];
27};
28
29struct unix_skb_parms {
30 struct pid *pid; /* Skb credentials */
31 const struct cred *cred;
32 struct scm_fp_list *fp; /* Passed files */
33#ifdef CONFIG_SECURITY_NETWORK
34 u32 secid; /* Security ID */
35#endif
36};
37
38#define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb))
39#define UNIXSID(skb) (&UNIXCB((skb)).secid)
40
41#define unix_state_lock(s) spin_lock(&unix_sk(s)->lock)
42#define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock)
43#define unix_state_lock_nested(s) \
44 spin_lock_nested(&unix_sk(s)->lock, \
45 SINGLE_DEPTH_NESTING)
46
47/* The AF_UNIX socket */
48struct unix_sock {
49 /* WARNING: sk has to be the first member */
50 struct sock sk;
51 struct unix_address *addr;
52 struct path path;
53 struct mutex readlock;
54 struct sock *peer;
55 struct sock *other;
56 struct list_head link;
57 atomic_long_t inflight;
58 spinlock_t lock;
59 unsigned int gc_candidate : 1;
60 unsigned int gc_maybe_cycle : 1;
61 unsigned char recursion_level;
62 struct socket_wq peer_wq;
63};
64#define unix_sk(__sk) ((struct unix_sock *)__sk)
65
66#define peer_wait peer_wq.wait
67
68long unix_inq_len(struct sock *sk);
69long unix_outq_len(struct sock *sk);
70
71#ifdef CONFIG_SYSCTL
72extern int unix_sysctl_register(struct net *net);
73extern void unix_sysctl_unregister(struct net *net);
74#else
75static inline int unix_sysctl_register(struct net *net) { return 0; }
76static inline void unix_sysctl_unregister(struct net *net) {}
77#endif
78#endif