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/*

 *              INETPEER - A storage for permanent information about peers

 *

 *  Version:    $Id: inetpeer.h,v 1.1.1.1 2004-04-15 02:34:15 phoenix 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 */

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)

{

        __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 */