inetpeer.h 1.32 KB
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/*
 *		INETPEER - A storage for permanent information about peers
 *
 *  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/jiffies.h>
#include <linux/spinlock.h>
#include <asm/atomic.h>

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struct inet_peer {
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	/* group together avl_left,avl_right,v4daddr to speedup lookups */
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	struct inet_peer	*avl_left, *avl_right;
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	__be32			v4daddr;	/* peer's address */
	__u16			avl_height;
	__u16			ip_id_count;	/* IP ID for the next packet */
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	struct list_head	unused;
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	__u32			dtime;		/* the time of last use of not
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						 * referenced entries */
	atomic_t		refcnt;
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	atomic_t		rid;		/* Frag reception counter */
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	__u32			tcp_ts;
	unsigned long		tcp_ts_stamp;
};

void			inet_initpeers(void) __init;

/* can be called with or without local BH being disabled */
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struct inet_peer	*inet_getpeer(__be32 daddr, int create);
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/* can be called from BH context or outside */
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extern void inet_putpeer(struct inet_peer *p);
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extern spinlock_t inet_peer_idlock;
/* can be called with or without local BH being disabled */
static inline __u16	inet_getid(struct inet_peer *p, int more)
{
	__u16 id;

	spin_lock_bh(&inet_peer_idlock);
	id = p->ip_id_count;
	p->ip_id_count += 1 + more;
	spin_unlock_bh(&inet_peer_idlock);
	return id;
}

#endif /* _NET_INETPEER_H */