1#ifndef __LINUX_NET_AFUNIX_H
 2#define __LINUX_NET_AFUNIX_H
 3
 4#include <linux/socket.h>
 5#include <linux/un.h>
 6#include <linux/mutex.h>
 
 7#include <net/sock.h>
 8
 9extern void unix_inflight(struct file *fp);
10extern void unix_notinflight(struct file *fp);
11extern void unix_gc(void);
12extern void wait_for_unix_gc(void);
13extern struct sock *unix_get_socket(struct file *filp);
14extern struct sock *unix_peer_get(struct sock *);
15
16#define UNIX_HASH_SIZE	256
 
 
 
17
18extern unsigned int unix_tot_inflight;
19extern spinlock_t unix_table_lock;
20extern struct hlist_head unix_socket_table[UNIX_HASH_SIZE + 1];
21
22struct unix_address {
23	atomic_t	refcnt;
24	int		len;
25	unsigned int	hash;
26	struct sockaddr_un name[0];
27};
28
29struct unix_skb_parms {
30	struct pid		*pid;		/* Skb credentials	*/
31	const struct cred	*cred;
 
32	struct scm_fp_list	*fp;		/* Passed files		*/
33#ifdef CONFIG_SECURITY_NETWORK
34	u32			secid;		/* Security ID		*/
35#endif
 
 
 
 
 
36};
37
38#define UNIXCB(skb) 	(*(struct unix_skb_parms *)&((skb)->cb))
39#define UNIXSID(skb)	(&UNIXCB((skb)).secid)
40
41#define unix_state_lock(s)	spin_lock(&unix_sk(s)->lock)
42#define unix_state_unlock(s)	spin_unlock(&unix_sk(s)->lock)
43#define unix_state_lock_nested(s) \
44				spin_lock_nested(&unix_sk(s)->lock, \
45				SINGLE_DEPTH_NESTING)
46
47/* The AF_UNIX socket */
48struct unix_sock {
49	/* WARNING: sk has to be the first member */
50	struct sock		sk;
51	struct unix_address     *addr;
52	struct path		path;
53	struct mutex		readlock;
54	struct sock		*peer;
55	struct sock		*other;
56	struct list_head	link;
57	atomic_long_t		inflight;
58	spinlock_t		lock;
59	unsigned int		gc_candidate : 1;
60	unsigned int		gc_maybe_cycle : 1;
61	unsigned char		recursion_level;
62	struct socket_wq	peer_wq;
 
 
 
 
 
63};
64#define unix_sk(__sk) ((struct unix_sock *)__sk)
 
 
 
 
65
66#define peer_wait peer_wq.wait
67
68long unix_inq_len(struct sock *sk);
69long unix_outq_len(struct sock *sk);
70
 
 
 
 
71#ifdef CONFIG_SYSCTL
72extern int unix_sysctl_register(struct net *net);
73extern void unix_sysctl_unregister(struct net *net);
74#else
75static inline int unix_sysctl_register(struct net *net) { return 0; }
76static inline void unix_sysctl_unregister(struct net *net) {}
 
 
 
 
 
 
 
 
 
 
 
 
77#endif
78#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 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_MOD	(256 - 1)
 20#define UNIX_HASH_SIZE	(256 * 2)
 21#define UNIX_HASH_BITS	8
 22
 23extern unsigned int unix_tot_inflight;
 
 
 24
 25struct unix_address {
 26	refcount_t	refcnt;
 27	int		len;
 28	struct sockaddr_un name[];
 
 29};
 30
 31struct unix_skb_parms {
 32	struct pid		*pid;		/* Skb credentials	*/
 33	kuid_t			uid;
 34	kgid_t			gid;
 35	struct scm_fp_list	*fp;		/* Passed files		*/
 36#ifdef CONFIG_SECURITY_NETWORK
 37	u32			secid;		/* Security ID		*/
 38#endif
 39	u32			consumed;
 40} __randomize_layout;
 41
 42struct scm_stat {
 43	atomic_t nr_fds;
 44};
 45
 46#define UNIXCB(skb)	(*(struct unix_skb_parms *)&((skb)->cb))
 
 47
 48#define unix_state_lock(s)	spin_lock(&unix_sk(s)->lock)
 49#define unix_state_unlock(s)	spin_unlock(&unix_sk(s)->lock)
 50#define unix_state_lock_nested(s) \
 51				spin_lock_nested(&unix_sk(s)->lock, \
 52				SINGLE_DEPTH_NESTING)
 53
 54/* The AF_UNIX socket */
 55struct unix_sock {
 56	/* WARNING: sk has to be the first member */
 57	struct sock		sk;
 58	struct unix_address	*addr;
 59	struct path		path;
 60	struct mutex		iolock, bindlock;
 61	struct sock		*peer;
 
 62	struct list_head	link;
 63	atomic_long_t		inflight;
 64	spinlock_t		lock;
 65	unsigned long		gc_flags;
 66#define UNIX_GC_CANDIDATE	0
 67#define UNIX_GC_MAYBE_CYCLE	1
 68	struct socket_wq	peer_wq;
 69	wait_queue_entry_t	peer_wake;
 70	struct scm_stat		scm_stat;
 71#if IS_ENABLED(CONFIG_AF_UNIX_OOB)
 72	struct sk_buff		*oob_skb;
 73#endif
 74};
 75
 76static inline struct unix_sock *unix_sk(const struct sock *sk)
 77{
 78	return (struct unix_sock *)sk;
 79}
 80
 81#define peer_wait peer_wq.wait
 82
 83long unix_inq_len(struct sock *sk);
 84long unix_outq_len(struct sock *sk);
 85
 86int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
 87			 int flags);
 88int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
 89			  int flags);
 90#ifdef CONFIG_SYSCTL
 91int unix_sysctl_register(struct net *net);
 92void unix_sysctl_unregister(struct net *net);
 93#else
 94static inline int unix_sysctl_register(struct net *net) { return 0; }
 95static inline void unix_sysctl_unregister(struct net *net) {}
 96#endif
 97
 98#ifdef CONFIG_BPF_SYSCALL
 99extern struct proto unix_dgram_proto;
100extern struct proto unix_stream_proto;
101
102int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
103int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
104void __init unix_bpf_build_proto(void);
105#else
106static inline void __init unix_bpf_build_proto(void)
107{}
108#endif
109#endif