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 void unix_inflight(struct user_struct *user, struct file *fp);
12 void unix_notinflight(struct user_struct *user, struct file *fp);
13 void unix_destruct_scm(struct sk_buff *skb);
14 void unix_gc(void);
15 void wait_for_unix_gc(void);
16 struct sock *unix_get_socket(struct file *filp);
17 struct sock *unix_peer_get(struct sock *sk);
18
19 #define UNIX_HASH_SIZE 256
20 #define UNIX_HASH_BITS 8
21
22 extern unsigned int unix_tot_inflight;
23 extern spinlock_t unix_table_lock;
24 extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE];
25
26 struct unix_address {
27 refcount_t refcnt;
28 int len;
29 unsigned int hash;
30 struct sockaddr_un name[];
31 };
32
33 struct 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 struct 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 */
57 struct 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
unix_sk(const struct sock * sk)78 static 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
85 long unix_inq_len(struct sock *sk);
86 long unix_outq_len(struct sock *sk);
87
88 int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
89 int flags);
90 int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
91 int flags);
92 #ifdef CONFIG_SYSCTL
93 int unix_sysctl_register(struct net *net);
94 void unix_sysctl_unregister(struct net *net);
95 #else
unix_sysctl_register(struct net * net)96 static inline int unix_sysctl_register(struct net *net) { return 0; }
unix_sysctl_unregister(struct net * net)97 static inline void unix_sysctl_unregister(struct net *net) {}
98 #endif
99
100 #ifdef CONFIG_BPF_SYSCALL
101 extern struct proto unix_dgram_proto;
102 extern struct proto unix_stream_proto;
103
104 int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
105 int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
106 void __init unix_bpf_build_proto(void);
107 #else
unix_bpf_build_proto(void)108 static inline void __init unix_bpf_build_proto(void)
109 {}
110 #endif
111 #endif
112
