Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef __LINUX_NET_AFUNIX_H |
3 | #define __LINUX_NET_AFUNIX_H | |
20380731 | 4 | |
20380731 ACM |
5 | #include <linux/socket.h> |
6 | #include <linux/un.h> | |
57b47a53 | 7 | #include <linux/mutex.h> |
8c9814b9 | 8 | #include <linux/refcount.h> |
20380731 ACM |
9 | #include <net/sock.h> |
10 | ||
d9f21b36 KI |
11 | #if IS_ENABLED(CONFIG_UNIX) |
12 | struct unix_sock *unix_get_socket(struct file *filp); | |
13 | #else | |
14 | static inline struct unix_sock *unix_get_socket(struct file *filp) | |
15 | { | |
16 | return NULL; | |
17 | } | |
18 | #endif | |
19 | ||
99a7a5b9 KI |
20 | extern spinlock_t unix_gc_lock; |
21 | extern unsigned int unix_tot_inflight; | |
22 | ||
415e3d3e HFS |
23 | void unix_inflight(struct user_struct *user, struct file *fp); |
24 | void unix_notinflight(struct user_struct *user, struct file *fp); | |
b60a8280 | 25 | void unix_gc(void); |
d9f21b36 | 26 | void wait_for_unix_gc(struct scm_fp_list *fpl); |
99a7a5b9 | 27 | |
c4147bea | 28 | struct sock *unix_peer_get(struct sock *sk); |
1da177e4 | 29 | |
f302d180 KI |
30 | #define UNIX_HASH_MOD (256 - 1) |
31 | #define UNIX_HASH_SIZE (256 * 2) | |
7123aaa3 | 32 | #define UNIX_HASH_BITS 8 |
1da177e4 | 33 | |
1da177e4 | 34 | struct unix_address { |
8c9814b9 | 35 | refcount_t refcnt; |
1da177e4 | 36 | int len; |
e9553762 | 37 | struct sockaddr_un name[]; |
1da177e4 LT |
38 | }; |
39 | ||
40 | struct unix_skb_parms { | |
7361c36c | 41 | struct pid *pid; /* Skb credentials */ |
6b0ee8c0 EB |
42 | kuid_t uid; |
43 | kgid_t gid; | |
1da177e4 | 44 | struct scm_fp_list *fp; /* Passed files */ |
877ce7c1 | 45 | #ifdef CONFIG_SECURITY_NETWORK |
dc49c1f9 | 46 | u32 secid; /* Security ID */ |
877ce7c1 | 47 | #endif |
e370a723 | 48 | u32 consumed; |
3859a271 | 49 | } __randomize_layout; |
1da177e4 | 50 | |
3c32da19 | 51 | struct scm_stat { |
7782040b | 52 | atomic_t nr_fds; |
3c32da19 KT |
53 | }; |
54 | ||
b1c23444 | 55 | #define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb)) |
1da177e4 | 56 | |
1da177e4 LT |
57 | /* The AF_UNIX socket */ |
58 | struct unix_sock { | |
59 | /* WARNING: sk has to be the first member */ | |
60 | struct sock sk; | |
424c22fb | 61 | struct unix_address *addr; |
40ffe67d | 62 | struct path path; |
6e1ce3c3 | 63 | struct mutex iolock, bindlock; |
43815482 | 64 | struct sock *peer; |
1fd05ba5 | 65 | struct list_head link; |
97af84a6 | 66 | unsigned long inflight; |
43815482 | 67 | spinlock_t lock; |
60bc851a ED |
68 | unsigned long gc_flags; |
69 | #define UNIX_GC_CANDIDATE 0 | |
70 | #define UNIX_GC_MAYBE_CYCLE 1 | |
43815482 | 71 | struct socket_wq peer_wq; |
424c22fb | 72 | wait_queue_entry_t peer_wake; |
3c32da19 | 73 | struct scm_stat scm_stat; |
314001f0 RS |
74 | #if IS_ENABLED(CONFIG_AF_UNIX_OOB) |
75 | struct sk_buff *oob_skb; | |
76 | #endif | |
1da177e4 | 77 | }; |
4613012d | 78 | |
b064ba9c | 79 | #define unix_sk(ptr) container_of_const(ptr, struct unix_sock, sk) |
8866730a | 80 | #define unix_peer(sk) (unix_sk(sk)->peer) |
20380731 | 81 | |
4d322dce ED |
82 | #define unix_state_lock(s) spin_lock(&unix_sk(s)->lock) |
83 | #define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock) | |
84 | enum unix_socket_lock_class { | |
85 | U_LOCK_NORMAL, | |
86 | U_LOCK_SECOND, /* for double locking, see unix_state_double_lock(). */ | |
87 | U_LOCK_DIAG, /* used while dumping icons, see sk_diag_dump_icons(). */ | |
1971d13f KI |
88 | U_LOCK_GC_LISTENER, /* used for listening socket while determining gc |
89 | * candidates to close a small race window. | |
90 | */ | |
4d322dce ED |
91 | }; |
92 | ||
93 | static inline void unix_state_lock_nested(struct sock *sk, | |
94 | enum unix_socket_lock_class subclass) | |
95 | { | |
96 | spin_lock_nested(&unix_sk(sk)->lock, subclass); | |
97 | } | |
98 | ||
43815482 ED |
99 | #define peer_wait peer_wq.wait |
100 | ||
885ee74d PE |
101 | long unix_inq_len(struct sock *sk); |
102 | long unix_outq_len(struct sock *sk); | |
103 | ||
9825d866 CW |
104 | int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size, |
105 | int flags); | |
94531cfc JW |
106 | int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size, |
107 | int flags); | |
20380731 | 108 | #ifdef CONFIG_SYSCTL |
b60a8280 JP |
109 | int unix_sysctl_register(struct net *net); |
110 | void unix_sysctl_unregister(struct net *net); | |
20380731 | 111 | #else |
97577e38 PE |
112 | static inline int unix_sysctl_register(struct net *net) { return 0; } |
113 | static inline void unix_sysctl_unregister(struct net *net) {} | |
20380731 | 114 | #endif |
c6382918 CW |
115 | |
116 | #ifdef CONFIG_BPF_SYSCALL | |
94531cfc JW |
117 | extern struct proto unix_dgram_proto; |
118 | extern struct proto unix_stream_proto; | |
c6382918 | 119 | |
94531cfc JW |
120 | int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore); |
121 | int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore); | |
c6382918 CW |
122 | void __init unix_bpf_build_proto(void); |
123 | #else | |
124 | static inline void __init unix_bpf_build_proto(void) | |
125 | {} | |
126 | #endif | |
1da177e4 | 127 | #endif |