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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
18struct inet_peer
19{
20 struct inet_peer *avl_left, *avl_right;
21 struct inet_peer *unused_next, **unused_prevp;
22 unsigned long dtime; /* the time of last use of not
23 * referenced entries */
24 atomic_t refcnt;
25 __u32 v4daddr; /* peer's address */
26 __u16 avl_height;
27 __u16 ip_id_count; /* IP ID for the next packet */
28 __u32 tcp_ts;
29 unsigned long tcp_ts_stamp;
30};
31
32void inet_initpeers(void) __init;
33
34/* can be called with or without local BH being disabled */
35struct inet_peer *inet_getpeer(__u32 daddr, int create);
36
37extern spinlock_t inet_peer_unused_lock;
38extern struct inet_peer **inet_peer_unused_tailp;
39/* can be called from BH context or outside */
40static inline void inet_putpeer(struct inet_peer *p)
41{
42 spin_lock_bh(&inet_peer_unused_lock);
43 if (atomic_dec_and_test(&p->refcnt)) {
44 p->unused_prevp = inet_peer_unused_tailp;
45 p->unused_next = NULL;
46 *inet_peer_unused_tailp = p;
47 inet_peer_unused_tailp = &p->unused_next;
48 p->dtime = jiffies;
49 }
50 spin_unlock_bh(&inet_peer_unused_lock);
51}
52
53extern spinlock_t inet_peer_idlock;
54/* can be called with or without local BH being disabled */
55static inline __u16 inet_getid(struct inet_peer *p, int more)
56{
57 __u16 id;
58
59 spin_lock_bh(&inet_peer_idlock);
60 id = p->ip_id_count;
61 p->ip_id_count += 1 + more;
62 spin_unlock_bh(&inet_peer_idlock);
63 return id;
64}
65
66#endif /* _NET_INETPEER_H */