1 /* 2 * INETPEER - A storage for permanent information about peers 3 * 4 * Version: $Id: inetpeer.h,v 1.1.2.1 2002/01/12 07:53:15 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/sched.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 atomic_t refcnt; 23 unsigned long dtime; /* the time of last use of not 24 * referenced entries */ 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_head; 39 extern struct inet_peer **inet_peer_unused_tailp; 40 /* can be called from BH context or outside */ inet_putpeer(struct inet_peer * p)41static inline void inet_putpeer(struct inet_peer *p) 42 { 43 spin_lock_bh(&inet_peer_unused_lock); 44 if (atomic_dec_and_test(&p->refcnt)) { 45 p->unused_prevp = inet_peer_unused_tailp; 46 p->unused_next = NULL; 47 *inet_peer_unused_tailp = p; 48 inet_peer_unused_tailp = &p->unused_next; 49 p->dtime = jiffies; 50 } 51 spin_unlock_bh(&inet_peer_unused_lock); 52 } 53 54 extern spinlock_t inet_peer_idlock; 55 /* can be called with or without local BH being disabled */ inet_getid(struct inet_peer * p)56static inline __u16 inet_getid(struct inet_peer *p) 57 { 58 __u16 id; 59 60 spin_lock_bh(&inet_peer_idlock); 61 id = p->ip_id_count++; 62 spin_unlock_bh(&inet_peer_idlock); 63 return id; 64 } 65 66 #endif /* _NET_INETPEER_H */ 67