[mirror_ubuntu-bionic-kernel.git] / include / net / af_unix.h

#ifndef __LINUX_NET_AFUNIX_H
#define __LINUX_NET_AFUNIX_H

#include <linux/socket.h>
#include <linux/un.h>
#include <linux/mutex.h>
#include <net/sock.h>

void unix_inflight(struct file *fp);
void unix_notinflight(struct file *fp);
void unix_gc(void);
void wait_for_unix_gc(void);
struct sock *unix_get_socket(struct file *filp);
struct sock *unix_peer_get(struct sock *);

#define UNIX_HASH_SIZE	256
#define UNIX_HASH_BITS	8

extern unsigned int unix_tot_inflight;
extern spinlock_t unix_table_lock;
extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE];

struct unix_address {
	atomic_t	refcnt;
	int		len;
	unsigned int	hash;
	struct sockaddr_un name[0];
};

struct unix_skb_parms {
	struct pid		*pid;		/* Skb credentials	*/
	kuid_t			uid;
	kgid_t			gid;
	struct scm_fp_list	*fp;		/* Passed files		*/
#ifdef CONFIG_SECURITY_NETWORK
	u32			secid;		/* Security ID		*/
#endif
	u32			consumed;
};

#define UNIXCB(skb) 	(*(struct unix_skb_parms *)&((skb)->cb))
#define UNIXSID(skb)	(&UNIXCB((skb)).secid)

#define unix_state_lock(s)	spin_lock(&unix_sk(s)->lock)
#define unix_state_unlock(s)	spin_unlock(&unix_sk(s)->lock)
#define unix_state_lock_nested(s) \
				spin_lock_nested(&unix_sk(s)->lock, \
				SINGLE_DEPTH_NESTING)

/* The AF_UNIX socket */
struct unix_sock {
	/* WARNING: sk has to be the first member */
	struct sock		sk;
	struct unix_address     *addr;
	struct path		path;
	struct mutex		readlock;
	struct sock		*peer;
	struct list_head	link;
	atomic_long_t		inflight;
	spinlock_t		lock;
	unsigned char		recursion_level;
	unsigned long		gc_flags;
#define UNIX_GC_CANDIDATE	0
#define UNIX_GC_MAYBE_CYCLE	1
	struct socket_wq	peer_wq;
};
#define unix_sk(__sk) ((struct unix_sock *)__sk)

#define peer_wait peer_wq.wait

long unix_inq_len(struct sock *sk);
long unix_outq_len(struct sock *sk);

#ifdef CONFIG_SYSCTL
int unix_sysctl_register(struct net *net);
void unix_sysctl_unregister(struct net *net);
#else
static inline int unix_sysctl_register(struct net *net) { return 0; }
static inline void unix_sysctl_unregister(struct net *net) {}
#endif
#endif
Commit	Line	Data
1da177e4 LT	1	#ifndef __LINUX_NET_AFUNIX_H
1da177e4 LT	2	#define __LINUX_NET_AFUNIX_H
20380731	3
20380731 ACM	4	#include <linux/socket.h>
20380731 ACM	5	#include <linux/un.h>
57b47a53	6	#include <linux/mutex.h>
20380731 ACM	7	#include <net/sock.h>
20380731 ACM	8
b60a8280 JP	9	void unix_inflight(struct file *fp);
	10	void unix_notinflight(struct file *fp);
	11	void unix_gc(void);
	12	void wait_for_unix_gc(void);
	13	struct sock unix_get_socket(struct file filp);
	14	struct sock unix_peer_get(struct sock );
1da177e4 LT	15
1da177e4 LT	16	#define UNIX_HASH_SIZE 256
7123aaa3	17	#define UNIX_HASH_BITS 8
1da177e4	18
9305cfa4	19	extern unsigned int unix_tot_inflight;
fa7ff56f	20	extern spinlock_t unix_table_lock;
7123aaa3	21	extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE];
1da177e4	22
1da177e4 LT	23	struct unix_address {
	24	atomic_t refcnt;
	25	int len;
95c96174	26	unsigned int hash;
1da177e4 LT	27	struct sockaddr_un name[0];
	28	};
	29
	30	struct unix_skb_parms {
7361c36c	31	struct pid pid; / Skb credentials */
6b0ee8c0 EB	32	kuid_t uid;
6b0ee8c0 EB	33	kgid_t gid;
1da177e4	34	struct scm_fp_list fp; / Passed files */
877ce7c1	35	#ifdef CONFIG_SECURITY_NETWORK
dc49c1f9	36	u32 secid; /* Security ID */
877ce7c1	37	#endif
e370a723	38	u32 consumed;
1da177e4 LT	39	};
1da177e4 LT	40
43815482	41	#define UNIXCB(skb) ((struct unix_skb_parms )&((skb)->cb))
dc49c1f9	42	#define UNIXSID(skb) (&UNIXCB((skb)).secid)
1da177e4	43
1c92b4e5 DM	44	#define unix_state_lock(s) spin_lock(&unix_sk(s)->lock)
	45	#define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock)
	46	#define unix_state_lock_nested(s) \
a09785a2 IM	47	spin_lock_nested(&unix_sk(s)->lock, \
a09785a2 IM	48	SINGLE_DEPTH_NESTING)
1da177e4	49
1da177e4 LT	50	/* The AF_UNIX socket */
	51	struct unix_sock {
	52	/* WARNING: sk has to be the first member */
	53	struct sock sk;
43815482	54	struct unix_address *addr;
40ffe67d	55	struct path path;
57b47a53	56	struct mutex readlock;
43815482	57	struct sock *peer;
1fd05ba5	58	struct list_head link;
43815482 ED	59	atomic_long_t inflight;
43815482 ED	60	spinlock_t lock;
25888e30	61	unsigned char recursion_level;
60bc851a ED	62	unsigned long gc_flags;
	63	#define UNIX_GC_CANDIDATE 0
	64	#define UNIX_GC_MAYBE_CYCLE 1
43815482	65	struct socket_wq peer_wq;
1da177e4 LT	66	};
1da177e4 LT	67	#define unix_sk(__sk) ((struct unix_sock *)__sk)
20380731	68
43815482 ED	69	#define peer_wait peer_wq.wait
43815482 ED	70
885ee74d PE	71	long unix_inq_len(struct sock *sk);
	72	long unix_outq_len(struct sock *sk);
	73
20380731	74	#ifdef CONFIG_SYSCTL
b60a8280 JP	75	int unix_sysctl_register(struct net *net);
b60a8280 JP	76	void unix_sysctl_unregister(struct net *net);
20380731	77	#else
97577e38 PE	78	static inline int unix_sysctl_register(struct net *net) { return 0; }
97577e38 PE	79	static inline void unix_sysctl_unregister(struct net *net) {}
20380731	80	#endif
1da177e4	81	#endif