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/*
* INETPEER - A storage for permanent information about peers
*
* Version: $Id: inetpeer.h,v 1.1 2000/01/06 00:41:51 davem Exp $
*
* Authors: Andrey V. Savochkin <saw@msu.ru>
*/
#ifndef _NET_INETPEER_H
#define _NET_INETPEER_H
#include <linux/types.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <asm/atomic.h>
struct inet_peer
{
struct inet_peer *avl_left, *avl_right;
struct inet_peer *unused_next, **unused_prevp;
atomic_t refcnt;
unsigned long dtime; /* the time of last use of not
* referenced entries */
__u32 v4daddr; /* peer's address */
__u16 avl_height;
__u16 ip_id_count; /* IP ID for the next packet */
__u32 tcp_ts;
unsigned long tcp_ts_stamp;
};
void inet_initpeers(void) __init;
/* can be called with or without local BH being disabled */
struct inet_peer *inet_getpeer(__u32 daddr, int create);
extern spinlock_t inet_peer_unused_lock;
extern struct inet_peer *inet_peer_unused_head;
extern struct inet_peer **inet_peer_unused_tailp;
/* can be called from BH context or outside */
extern inline void inet_putpeer(struct inet_peer *p)
{
spin_lock_bh(&inet_peer_unused_lock);
if (atomic_dec_and_test(&p->refcnt)) {
p->unused_prevp = inet_peer_unused_tailp;
p->unused_next = NULL;
*inet_peer_unused_tailp = p;
inet_peer_unused_tailp = &p->unused_next;
p->dtime = jiffies;
}
spin_unlock_bh(&inet_peer_unused_lock);
}
extern spinlock_t inet_peer_idlock;
/* can be called with or without local BH being disabled */
extern inline __u16 inet_getid(struct inet_peer *p)
{
__u16 id;
spin_lock_bh(&inet_peer_idlock);
id = p->ip_id_count++;
spin_unlock_bh(&inet_peer_idlock);
return id;
}
#endif /* _NET_INETPEER_H */
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