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