[mirror_ubuntu-bionic-kernel.git] / include / net / inetpeer.h

/*
 *		INETPEER - A storage for permanent information about peers
 *
 *  Version:	$Id: inetpeer.h,v 1.2 2002/01/12 07:54:56 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/jiffies.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;
	unsigned long		dtime;		/* the time of last use of not
						 * referenced entries */
	atomic_t		refcnt;
	__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_tailp;
/* can be called from BH context or outside */
static 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 */
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 */
Commit	Line	Data
1da177e4 LT	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
	18	struct 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
	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_tailp;
	39	/* can be called from BH context or outside */
	40	static 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
	53	extern spinlock_t inet_peer_idlock;
	54	/* can be called with or without local BH being disabled */
	55	static 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 */