1/*
2 *		INETPEER - A storage for permanent information about peers
3 *
4 *  Version:	$Id: inetpeer.h,v 1.1.1.1 2007/08/03 18:53:45 Exp $
5 *
6 *  Authors:	Andrey V. Savochkin <saw@msu.ru>
7 */
8
9#ifndef _NET_INETPEER_H
10#define _NET_INETPEER_H
11
12#include <linux/types.h>
13#include <linux/init.h>
14#include <linux/jiffies.h>
15#include <linux/spinlock.h>
16#include <asm/atomic.h>
17
18struct inet_peer
19{
20	/* group together avl_left,avl_right,v4daddr to speedup lookups */
21	struct inet_peer	*avl_left, *avl_right;
22	__be32			v4daddr;	/* peer's address */
23	__u16			avl_height;
24	__u16			ip_id_count;	/* IP ID for the next packet */
25	struct inet_peer	*unused_next, **unused_prevp;
26	__u32			dtime;		/* the time of last use of not
27						 * referenced entries */
28	atomic_t		refcnt;
29	atomic_t		rid;		/* Frag reception counter */
30	__u32			tcp_ts;
31	unsigned long		tcp_ts_stamp;
32};
33
34void			inet_initpeers(void) __init;
35
36/* can be called with or without local BH being disabled */
37struct inet_peer	*inet_getpeer(__be32 daddr, int create);
38
39/* can be called from BH context or outside */
40extern void inet_putpeer(struct inet_peer *p);
41
42extern spinlock_t inet_peer_idlock;
43/* can be called with or without local BH being disabled */
44static inline __u16	inet_getid(struct inet_peer *p, int more)
45{
46	__u16 id;
47
48	spin_lock_bh(&inet_peer_idlock);
49	id = p->ip_id_count;
50	p->ip_id_count += 1 + more;
51	spin_unlock_bh(&inet_peer_idlock);
52	return id;
53}
54
55#endif /* _NET_INETPEER_H */
56