[deliverable/linux.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>

extern void unix_inflight(struct file *fp);
extern void unix_notinflight(struct file *fp);
extern void unix_gc(void);

#define UNIX_HASH_SIZE	256

extern struct hlist_head unix_socket_table[UNIX_HASH_SIZE + 1];
extern spinlock_t unix_table_lock;

extern atomic_t unix_tot_inflight;

static inline struct sock *first_unix_socket(int *i)
{
	for (*i = 0; *i <= UNIX_HASH_SIZE; (*i)++) {
		if (!hlist_empty(&unix_socket_table[*i]))
			return __sk_head(&unix_socket_table[*i]);
	}
	return NULL;
}

static inline struct sock *next_unix_socket(int *i, struct sock *s)
{
	struct sock *next = sk_next(s);
	/* More in this chain? */
	if (next)
		return next;
	/* Look for next non-empty chain. */
	for ((*i)++; *i <= UNIX_HASH_SIZE; (*i)++) {
		if (!hlist_empty(&unix_socket_table[*i]))
			return __sk_head(&unix_socket_table[*i]);
	}
	return NULL;
}

#define forall_unix_sockets(i, s) \
	for (s = first_unix_socket(&(i)); s; s = next_unix_socket(&(i),(s)))

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

struct unix_skb_parms {
	struct ucred		creds;		/* Skb credentials	*/
	struct scm_fp_list	*fp;		/* Passed files		*/
#ifdef CONFIG_SECURITY_NETWORK
	u32			secid;		/* Security ID		*/
#endif
};

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

#define unix_state_rlock(s)	spin_lock(&unix_sk(s)->lock)
#define unix_state_runlock(s)	spin_unlock(&unix_sk(s)->lock)
#define unix_state_wlock(s)	spin_lock(&unix_sk(s)->lock)
#define unix_state_wlock_nested(s) \
				spin_lock_nested(&unix_sk(s)->lock, \
				SINGLE_DEPTH_NESTING)
#define unix_state_wunlock(s)	spin_unlock(&unix_sk(s)->lock)

#ifdef __KERNEL__
/* The AF_UNIX socket */
struct unix_sock {
	/* WARNING: sk has to be the first member */
	struct sock		sk;
        struct unix_address     *addr;
        struct dentry		*dentry;
        struct vfsmount		*mnt;
	struct mutex		readlock;
        struct sock		*peer;
        struct sock		*other;
        struct sock		*gc_tree;
        atomic_t                inflight;
        spinlock_t		lock;
        wait_queue_head_t       peer_wait;
};
#define unix_sk(__sk) ((struct unix_sock *)__sk)

#ifdef CONFIG_SYSCTL
extern int sysctl_unix_max_dgram_qlen;
extern void unix_sysctl_register(void);
extern void unix_sysctl_unregister(void);
#else
static inline void unix_sysctl_register(void) {}
static inline void unix_sysctl_unregister(void) {}
#endif
#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
1da177e4 LT	9	extern void unix_inflight(struct file *fp);
	10	extern void unix_notinflight(struct file *fp);
	11	extern void unix_gc(void);
	12
	13	#define UNIX_HASH_SIZE 256
	14
	15	extern struct hlist_head unix_socket_table[UNIX_HASH_SIZE + 1];
fbe9cc4a	16	extern spinlock_t unix_table_lock;
1da177e4 LT	17
	18	extern atomic_t unix_tot_inflight;
	19
	20	static inline struct sock first_unix_socket(int i)
	21	{
	22	for (i = 0; i <= UNIX_HASH_SIZE; (*i)++) {
	23	if (!hlist_empty(&unix_socket_table[*i]))
	24	return __sk_head(&unix_socket_table[*i]);
	25	}
	26	return NULL;
	27	}
	28
	29	static inline struct sock next_unix_socket(int i, struct sock *s)
	30	{
	31	struct sock *next = sk_next(s);
	32	/* More in this chain? */
	33	if (next)
	34	return next;
	35	/* Look for next non-empty chain. */
	36	for ((i)++; i <= UNIX_HASH_SIZE; (*i)++) {
	37	if (!hlist_empty(&unix_socket_table[*i]))
	38	return __sk_head(&unix_socket_table[*i]);
	39	}
	40	return NULL;
	41	}
	42
	43	#define forall_unix_sockets(i, s) \
	44	for (s = first_unix_socket(&(i)); s; s = next_unix_socket(&(i),(s)))
	45
	46	struct unix_address {
	47	atomic_t refcnt;
	48	int len;
	49	unsigned hash;
	50	struct sockaddr_un name[0];
	51	};
	52
	53	struct unix_skb_parms {
	54	struct ucred creds; /* Skb credentials */
	55	struct scm_fp_list fp; / Passed files */
877ce7c1	56	#ifdef CONFIG_SECURITY_NETWORK
dc49c1f9	57	u32 secid; /* Security ID */
877ce7c1	58	#endif
1da177e4 LT	59	};
	60
	61	#define UNIXCB(skb) ((struct unix_skb_parms)&((skb)->cb))
	62	#define UNIXCREDS(skb) (&UNIXCB((skb)).creds)
dc49c1f9	63	#define UNIXSID(skb) (&UNIXCB((skb)).secid)
1da177e4	64
fd19f329 BL	65	#define unix_state_rlock(s) spin_lock(&unix_sk(s)->lock)
	66	#define unix_state_runlock(s) spin_unlock(&unix_sk(s)->lock)
	67	#define unix_state_wlock(s) spin_lock(&unix_sk(s)->lock)
a09785a2 IM	68	#define unix_state_wlock_nested(s) \
	69	spin_lock_nested(&unix_sk(s)->lock, \
	70	SINGLE_DEPTH_NESTING)
fd19f329	71	#define unix_state_wunlock(s) spin_unlock(&unix_sk(s)->lock)
1da177e4 LT	72
	73	#ifdef __KERNEL__
	74	/* The AF_UNIX socket */
	75	struct unix_sock {
	76	/* WARNING: sk has to be the first member */
	77	struct sock sk;
	78	struct unix_address *addr;
	79	struct dentry *dentry;
	80	struct vfsmount *mnt;
57b47a53	81	struct mutex readlock;
1da177e4 LT	82	struct sock *peer;
	83	struct sock *other;
	84	struct sock *gc_tree;
	85	atomic_t inflight;
fd19f329	86	spinlock_t lock;
1da177e4 LT	87	wait_queue_head_t peer_wait;
	88	};
	89	#define unix_sk(__sk) ((struct unix_sock *)__sk)
20380731 ACM	90
	91	#ifdef CONFIG_SYSCTL
	92	extern int sysctl_unix_max_dgram_qlen;
	93	extern void unix_sysctl_register(void);
	94	extern void unix_sysctl_unregister(void);
	95	#else
	96	static inline void unix_sysctl_register(void) {}
	97	static inline void unix_sysctl_unregister(void) {}
	98	#endif
1da177e4 LT	99	#endif
1da177e4 LT	100	#endif