1 /* 2 * INETPEER - A storage for permanent information about peers 3 * 4 * Version: $Id: inetpeer.h,v 1.2 2002/01/12 07:54:56 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/jiffies.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 unsigned long dtime; /* the time of last use of not 23 * referenced entries */ 24 atomic_t refcnt; 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_tailp; 39 /* can be called from BH context or outside */ 40 static inline void inet_putpeer(struct inet_peer *p) 41 { 42 spin_lock_bh(&inet_peer_unused_lock); 43 if (atomic_dec_and_test(&p->refcnt)) { 44 p->unused_prevp = inet_peer_unused_tailp; 45 p->unused_next = NULL; 46 *inet_peer_unused_tailp = p; 47 inet_peer_unused_tailp = &p->unused_next; 48 p->dtime = jiffies; 49 } 50 spin_unlock_bh(&inet_peer_unused_lock); 51 } 52 53 extern spinlock_t inet_peer_idlock; 54 /* can be called with or without local BH being disabled */ 55 static inline __u16 inet_getid(struct inet_peer *p, int more) 56 { 57 __u16 id; 58 59 spin_lock_bh(&inet_peer_idlock); 60 id = p->ip_id_count; 61 p->ip_id_count += 1 + more; 62 spin_unlock_bh(&inet_peer_idlock); 63 return id; 64 } 65 66 #endif /* _NET_INETPEER_H */ 67