mirror of
https://github.com/torvalds/linux.git
synced 2024-11-12 15:11:50 +00:00
67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
|
/*
|
||
|
|
* 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 */
|