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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 atomic_t rid; /* Frag reception counter */
29 __u32 tcp_ts;
30 unsigned long tcp_ts_stamp;
31};
32
33void inet_initpeers(void) __init;
34
35/* can be called with or without local BH being disabled */
36struct inet_peer *inet_getpeer(__u32 daddr, int create);
37
38extern spinlock_t inet_peer_unused_lock;
39extern struct inet_peer **inet_peer_unused_tailp;
40/* can be called from BH context or outside */
41static inline void inet_putpeer(struct inet_peer *p)
42{
43 spin_lock_bh(&inet_peer_unused_lock);
44 if (atomic_dec_and_test(&p->refcnt)) {
45 p->unused_prevp = inet_peer_unused_tailp;
46 p->unused_next = NULL;
47 *inet_peer_unused_tailp = p;
48 inet_peer_unused_tailp = &p->unused_next;
49 p->dtime = jiffies;
50 }
51 spin_unlock_bh(&inet_peer_unused_lock);
52}
53
54extern spinlock_t inet_peer_idlock;
55/* can be called with or without local BH being disabled */
56static inline __u16 inet_getid(struct inet_peer *p, int more)
57{
58 __u16 id;
59
60 spin_lock_bh(&inet_peer_idlock);
61 id = p->ip_id_count;
62 p->ip_id_count += 1 + more;
63 spin_unlock_bh(&inet_peer_idlock);
64 return id;
65}
66
67#endif /* _NET_INETPEER_H */