inetpeer.h
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上传日期:2013-02-24
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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 */