inetpeer.h

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/*
 *              INETPEER - A storage for permanent information about peers
 *
 *  Version:    $Id: inetpeer.h,v 1.1.2.1 2002/01/12 07:53:15 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 */
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 */

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