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 io_uring_destruct_scm(struct sk_buff *skb);
15 void unix_gc(void);
16 void wait_for_unix_gc(void);
17 struct sock *unix_get_socket(struct file *filp);
18 struct 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
24 extern unsigned int unix_tot_inflight;
25
26 struct unix_address {
27 refcount_t refcnt;
28 int len;
29 struct sockaddr_un name[];
30 };
31
32 struct 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
43 struct 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 */
50 struct 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 unsigned long 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)
76 enum 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 U_LOCK_GC_LISTENER, /* used for listening socket while determining gc
81 * candidates to close a small race window.
82 */
83 };
84
unix_state_lock_nested(struct sock * sk,enum unix_socket_lock_class subclass)85 static inline void unix_state_lock_nested(struct sock *sk,
86 enum unix_socket_lock_class subclass)
87 {
88 spin_lock_nested(&unix_sk(sk)->lock, subclass);
89 }
90
91 #define peer_wait peer_wq.wait
92
93 long unix_inq_len(struct sock *sk);
94 long unix_outq_len(struct sock *sk);
95
96 int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
97 int flags);
98 int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
99 int flags);
100 #ifdef CONFIG_SYSCTL
101 int unix_sysctl_register(struct net *net);
102 void unix_sysctl_unregister(struct net *net);
103 #else
unix_sysctl_register(struct net * net)104 static inline int unix_sysctl_register(struct net *net) { return 0; }
unix_sysctl_unregister(struct net * net)105 static inline void unix_sysctl_unregister(struct net *net) {}
106 #endif
107
108 #ifdef CONFIG_BPF_SYSCALL
109 extern struct proto unix_dgram_proto;
110 extern struct proto unix_stream_proto;
111
112 int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
113 int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
114 void __init unix_bpf_build_proto(void);
115 #else
unix_bpf_build_proto(void)116 static inline void __init unix_bpf_build_proto(void)
117 {}
118 #endif
119 #endif
120