xref: /openbmc/linux/include/net/inetpeer.h (revision 22246614)
1 /*
2  *		INETPEER - A storage for permanent information about peers
3  *
4  *  Version:	$Id: inetpeer.h,v 1.2 2002/01/12 07:54:56 davem 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 
18 struct 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 list_head	unused;
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 
34 void			inet_initpeers(void) __init;
35 
36 /* can be called with or without local BH being disabled */
37 struct inet_peer	*inet_getpeer(__be32 daddr, int create);
38 
39 /* can be called from BH context or outside */
40 extern void inet_putpeer(struct inet_peer *p);
41 
42 extern spinlock_t inet_peer_idlock;
43 /* can be called with or without local BH being disabled */
44 static 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