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
11void unix_inflight(struct user_struct *user, struct file *fp);
12void unix_notinflight(struct user_struct *user, struct file *fp);
13void unix_destruct_scm(struct sk_buff *skb);
 
14void unix_gc(void);
15void wait_for_unix_gc(void);
16struct sock *unix_get_socket(struct file *filp);
17struct sock *unix_peer_get(struct sock *sk);
18
19#define UNIX_HASH_SIZE	256
 
20#define UNIX_HASH_BITS	8
21
22extern unsigned int unix_tot_inflight;
23extern spinlock_t unix_table_lock;
24extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE];
25
26struct unix_address {
27	refcount_t	refcnt;
28	int		len;
29	unsigned int	hash;
30	struct sockaddr_un name[0];
31};
32
33struct 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#define UNIXCB(skb)	(*(struct unix_skb_parms *)&((skb)->cb))
 
 
45
46#define unix_state_lock(s)	spin_lock(&unix_sk(s)->lock)
47#define unix_state_unlock(s)	spin_unlock(&unix_sk(s)->lock)
48#define unix_state_lock_nested(s) \
49				spin_lock_nested(&unix_sk(s)->lock, \
50				SINGLE_DEPTH_NESTING)
51
52/* The AF_UNIX socket */
53struct unix_sock {
54	/* WARNING: sk has to be the first member */
55	struct sock		sk;
56	struct unix_address	*addr;
57	struct path		path;
58	struct mutex		iolock, bindlock;
59	struct sock		*peer;
60	struct list_head	link;
61	atomic_long_t		inflight;
62	spinlock_t		lock;
63	unsigned long		gc_flags;
64#define UNIX_GC_CANDIDATE	0
65#define UNIX_GC_MAYBE_CYCLE	1
66	struct socket_wq	peer_wq;
67	wait_queue_entry_t	peer_wake;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
68};
69
70static inline struct unix_sock *unix_sk(const struct sock *sk)
 
71{
72	return (struct unix_sock *)sk;
73}
74
75#define peer_wait peer_wq.wait
76
77long unix_inq_len(struct sock *sk);
78long unix_outq_len(struct sock *sk);
79
 
 
 
 
80#ifdef CONFIG_SYSCTL
81int unix_sysctl_register(struct net *net);
82void unix_sysctl_unregister(struct net *net);
83#else
84static inline int unix_sysctl_register(struct net *net) { return 0; }
85static inline void unix_sysctl_unregister(struct net *net) {}
 
 
 
 
 
 
 
 
 
 
 
 
86#endif
87#endif

  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
 11void unix_inflight(struct user_struct *user, struct file *fp);
 12void unix_notinflight(struct user_struct *user, struct file *fp);
 13void unix_destruct_scm(struct sk_buff *skb);
 14void io_uring_destruct_scm(struct sk_buff *skb);
 15void unix_gc(void);
 16void wait_for_unix_gc(void);
 17struct sock *unix_get_socket(struct file *filp);
 18struct 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
 24extern unsigned int unix_tot_inflight;
 
 
 25
 26struct unix_address {
 27	refcount_t	refcnt;
 28	int		len;
 29	struct sockaddr_un name[];
 
 30};
 31
 32struct 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
 43struct 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 */
 50struct 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	atomic_long_t		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)
 76enum 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};
 81
 82static inline void unix_state_lock_nested(struct sock *sk,
 83				   enum unix_socket_lock_class subclass)
 84{
 85	spin_lock_nested(&unix_sk(sk)->lock, subclass);
 86}
 87
 88#define peer_wait peer_wq.wait
 89
 90long unix_inq_len(struct sock *sk);
 91long unix_outq_len(struct sock *sk);
 92
 93int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
 94			 int flags);
 95int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
 96			  int flags);
 97#ifdef CONFIG_SYSCTL
 98int unix_sysctl_register(struct net *net);
 99void unix_sysctl_unregister(struct net *net);
100#else
101static inline int unix_sysctl_register(struct net *net) { return 0; }
102static inline void unix_sysctl_unregister(struct net *net) {}
103#endif
104
105#ifdef CONFIG_BPF_SYSCALL
106extern struct proto unix_dgram_proto;
107extern struct proto unix_stream_proto;
108
109int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
110int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
111void __init unix_bpf_build_proto(void);
112#else
113static inline void __init unix_bpf_build_proto(void)
114{}
115#endif
116#endif