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);
14
15#define UNIX_HASH_SIZE	256
 
16
 
17extern unsigned int unix_tot_inflight;
18
 
 
 
 
 
 
 
 
 
 
 
19struct unix_address {
20	atomic_t	refcnt;
21	int		len;
22	unsigned	hash;
23	struct sockaddr_un name[0];
24};
25
26struct unix_skb_parms {
27	struct pid		*pid;		/* Skb credentials	*/
28	const struct cred	*cred;
 
29	struct scm_fp_list	*fp;		/* Passed files		*/
30#ifdef CONFIG_SECURITY_NETWORK
31	u32			secid;		/* Security ID		*/
32#endif
33};
 
34
35#define UNIXCB(skb) 	(*(struct unix_skb_parms *)&((skb)->cb))
36#define UNIXSID(skb)	(&UNIXCB((skb)).secid)
 
37
38#define unix_state_lock(s)	spin_lock(&unix_sk(s)->lock)
39#define unix_state_unlock(s)	spin_unlock(&unix_sk(s)->lock)
40#define unix_state_lock_nested(s) \
41				spin_lock_nested(&unix_sk(s)->lock, \
42				SINGLE_DEPTH_NESTING)
43
44/* The AF_UNIX socket */
45struct unix_sock {
46	/* WARNING: sk has to be the first member */
47	struct sock		sk;
48	struct unix_address     *addr;
49	struct dentry		*dentry;
50	struct vfsmount		*mnt;
51	struct mutex		readlock;
52	struct sock		*peer;
53	struct sock		*other;
54	struct list_head	link;
55	atomic_long_t		inflight;
56	spinlock_t		lock;
57	unsigned int		gc_candidate : 1;
58	unsigned int		gc_maybe_cycle : 1;
59	unsigned char		recursion_level;
60	struct socket_wq	peer_wq;
 
 
 
 
 
61};
62#define unix_sk(__sk) ((struct unix_sock *)__sk)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
63
64#define peer_wait peer_wq.wait
65
 
 
 
 
 
 
 
66#ifdef CONFIG_SYSCTL
67extern int unix_sysctl_register(struct net *net);
68extern void unix_sysctl_unregister(struct net *net);
69#else
70static inline int unix_sysctl_register(struct net *net) { return 0; }
71static inline void unix_sysctl_unregister(struct net *net) {}
 
 
 
 
 
 
 
 
 
 
 
 
72#endif
73#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
 11#if IS_ENABLED(CONFIG_UNIX)
 12struct unix_sock *unix_get_socket(struct file *filp);
 13#else
 14static inline struct unix_sock *unix_get_socket(struct file *filp)
 15{
 16	return NULL;
 17}
 18#endif
 19
 20extern spinlock_t unix_gc_lock;
 21extern unsigned int unix_tot_inflight;
 22
 23void unix_inflight(struct user_struct *user, struct file *fp);
 24void unix_notinflight(struct user_struct *user, struct file *fp);
 25void unix_gc(void);
 26void wait_for_unix_gc(struct scm_fp_list *fpl);
 27
 28struct sock *unix_peer_get(struct sock *sk);
 29
 30#define UNIX_HASH_MOD	(256 - 1)
 31#define UNIX_HASH_SIZE	(256 * 2)
 32#define UNIX_HASH_BITS	8
 33
 34struct unix_address {
 35	refcount_t	refcnt;
 36	int		len;
 37	struct sockaddr_un name[];
 
 38};
 39
 40struct unix_skb_parms {
 41	struct pid		*pid;		/* Skb credentials	*/
 42	kuid_t			uid;
 43	kgid_t			gid;
 44	struct scm_fp_list	*fp;		/* Passed files		*/
 45#ifdef CONFIG_SECURITY_NETWORK
 46	u32			secid;		/* Security ID		*/
 47#endif
 48	u32			consumed;
 49} __randomize_layout;
 50
 51struct scm_stat {
 52	atomic_t nr_fds;
 53};
 54
 55#define UNIXCB(skb)	(*(struct unix_skb_parms *)&((skb)->cb))
 
 
 
 
 56
 57/* The AF_UNIX socket */
 58struct unix_sock {
 59	/* WARNING: sk has to be the first member */
 60	struct sock		sk;
 61	struct unix_address	*addr;
 62	struct path		path;
 63	struct mutex		iolock, bindlock;
 
 64	struct sock		*peer;
 
 65	struct list_head	link;
 66	unsigned long		inflight;
 67	spinlock_t		lock;
 68	unsigned long		gc_flags;
 69#define UNIX_GC_CANDIDATE	0
 70#define UNIX_GC_MAYBE_CYCLE	1
 71	struct socket_wq	peer_wq;
 72	wait_queue_entry_t	peer_wake;
 73	struct scm_stat		scm_stat;
 74#if IS_ENABLED(CONFIG_AF_UNIX_OOB)
 75	struct sk_buff		*oob_skb;
 76#endif
 77};
 78
 79#define unix_sk(ptr) container_of_const(ptr, struct unix_sock, sk)
 80#define unix_peer(sk) (unix_sk(sk)->peer)
 81
 82#define unix_state_lock(s)	spin_lock(&unix_sk(s)->lock)
 83#define unix_state_unlock(s)	spin_unlock(&unix_sk(s)->lock)
 84enum 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(). */
 88	U_LOCK_GC_LISTENER, /* used for listening socket while determining gc
 89			     * candidates to close a small race window.
 90			     */
 91};
 92
 93static 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
 99#define peer_wait peer_wq.wait
100
101long unix_inq_len(struct sock *sk);
102long unix_outq_len(struct sock *sk);
103
104int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
105			 int flags);
106int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
107			  int flags);
108#ifdef CONFIG_SYSCTL
109int unix_sysctl_register(struct net *net);
110void unix_sysctl_unregister(struct net *net);
111#else
112static inline int unix_sysctl_register(struct net *net) { return 0; }
113static inline void unix_sysctl_unregister(struct net *net) {}
114#endif
115
116#ifdef CONFIG_BPF_SYSCALL
117extern struct proto unix_dgram_proto;
118extern struct proto unix_stream_proto;
119
120int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
121int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
122void __init unix_bpf_build_proto(void);
123#else
124static inline void __init unix_bpf_build_proto(void)
125{}
126#endif
127#endif