1 /*
2 * INETPEER - A storage for permanent information about peers
3 *
4 * Version: $Id: inetpeer.h,v 1.1 2000/01/06 00:41:51 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/sched.h>
15 #include <linux/spinlock.h>
16 #include <asm/atomic.h>
17
18 struct inet_peer
19 {
20 struct inet_peer *avl_left, *avl_right;
21 struct inet_peer *unused_next, **unused_prevp;
22 atomic_t refcnt;
23 unsigned long dtime; /* the time of last use of not
24 * referenced entries */
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
32 void inet_initpeers(void) __init;
33
34 /* can be called with or without local BH being disabled */
35 struct inet_peer *inet_getpeer(__u32 daddr, int create);
36
37 extern spinlock_t inet_peer_unused_lock;
38 extern struct inet_peer *inet_peer_unused_head;
39 extern struct inet_peer **inet_peer_unused_tailp;
40 /* can be called from BH context or outside */
41 extern 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
54 extern spinlock_t inet_peer_idlock;
55 /* can be called with or without local BH being disabled */
56 extern inline __u16 inet_getid(struct inet_peer *p)
57 {
58 __u16 id;
59
60 spin_lock_bh(&inet_peer_idlock);
61 id = p->ip_id_count++;
62 spin_unlock_bh(&inet_peer_idlock);
63 return id;
64 }
65
66 #endif /* _NET_INETPEER_H */
67
This page was automatically generated by the
LXR engine.
Visit the LXR main site for more
information.