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 #if IS_ENABLED(CONFIG_UNIX)
12 struct unix_sock *unix_get_socket(struct file *filp);
13 #else
unix_get_socket(struct file * filp)14 static inline struct unix_sock *unix_get_socket(struct file *filp)
15 {
16 return NULL;
17 }
18 #endif
19
20 extern unsigned int unix_tot_inflight;
21 void unix_add_edges(struct scm_fp_list *fpl, struct unix_sock *receiver);
22 void unix_del_edges(struct scm_fp_list *fpl);
23 void unix_update_edges(struct unix_sock *receiver);
24 int unix_prepare_fpl(struct scm_fp_list *fpl);
25 void unix_destroy_fpl(struct scm_fp_list *fpl);
26 void unix_gc(void);
27 void wait_for_unix_gc(struct scm_fp_list *fpl);
28
29 struct unix_vertex {
30 struct list_head edges;
31 struct list_head entry;
32 struct list_head scc_entry;
33 unsigned long out_degree;
34 unsigned long index;
35 unsigned long scc_index;
36 };
37
38 struct unix_edge {
39 struct unix_sock *predecessor;
40 struct unix_sock *successor;
41 struct list_head vertex_entry;
42 struct list_head stack_entry;
43 };
44
45 struct sock *unix_peer_get(struct sock *sk);
46
47 #define UNIX_HASH_MOD (256 - 1)
48 #define UNIX_HASH_SIZE (256 * 2)
49 #define UNIX_HASH_BITS 8
50
51 struct unix_address {
52 refcount_t refcnt;
53 int len;
54 struct sockaddr_un name[];
55 };
56
57 struct unix_skb_parms {
58 struct pid *pid; /* Skb credentials */
59 kuid_t uid;
60 kgid_t gid;
61 struct scm_fp_list *fp; /* Passed files */
62 #ifdef CONFIG_SECURITY_NETWORK
63 u32 secid; /* Security ID */
64 #endif
65 u32 consumed;
66 } __randomize_layout;
67
68 struct scm_stat {
69 atomic_t nr_fds;
70 unsigned long nr_unix_fds;
71 };
72
73 #define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb))
74
75 /* The AF_UNIX socket */
76 struct unix_sock {
77 /* WARNING: sk has to be the first member */
78 struct sock sk;
79 struct unix_address *addr;
80 struct path path;
81 struct mutex iolock, bindlock;
82 struct sock *peer;
83 struct sock *listener;
84 struct unix_vertex *vertex;
85 spinlock_t lock;
86 struct socket_wq peer_wq;
87 wait_queue_entry_t peer_wake;
88 struct scm_stat scm_stat;
89 #if IS_ENABLED(CONFIG_AF_UNIX_OOB)
90 struct sk_buff *oob_skb;
91 #endif
92 };
93
94 #define unix_sk(ptr) container_of_const(ptr, struct unix_sock, sk)
95 #define unix_peer(sk) (unix_sk(sk)->peer)
96
97 #define unix_state_lock(s) spin_lock(&unix_sk(s)->lock)
98 #define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock)
99 enum unix_socket_lock_class {
100 U_LOCK_NORMAL,
101 U_LOCK_SECOND, /* for double locking, see unix_state_double_lock(). */
102 U_LOCK_DIAG, /* used while dumping icons, see sk_diag_dump_icons(). */
103 U_LOCK_GC_LISTENER, /* used for listening socket while determining gc
104 * candidates to close a small race window.
105 */
106 };
107
unix_state_lock_nested(struct sock * sk,enum unix_socket_lock_class subclass)108 static inline void unix_state_lock_nested(struct sock *sk,
109 enum unix_socket_lock_class subclass)
110 {
111 spin_lock_nested(&unix_sk(sk)->lock, subclass);
112 }
113
114 #define peer_wait peer_wq.wait
115
116 long unix_inq_len(struct sock *sk);
117 long unix_outq_len(struct sock *sk);
118
119 int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
120 int flags);
121 int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
122 int flags);
123 #ifdef CONFIG_SYSCTL
124 int unix_sysctl_register(struct net *net);
125 void unix_sysctl_unregister(struct net *net);
126 #else
unix_sysctl_register(struct net * net)127 static inline int unix_sysctl_register(struct net *net) { return 0; }
unix_sysctl_unregister(struct net * net)128 static inline void unix_sysctl_unregister(struct net *net) {}
129 #endif
130
131 #ifdef CONFIG_BPF_SYSCALL
132 extern struct proto unix_dgram_proto;
133 extern struct proto unix_stream_proto;
134
135 int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
136 int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
137 void __init unix_bpf_build_proto(void);
138 #else
unix_bpf_build_proto(void)139 static inline void __init unix_bpf_build_proto(void)
140 {}
141 #endif
142 #endif
143