53576d9b99
This one is interesting - we use net-endian value as search key, but order the tree by *host-endian* comparisons of keys. OK since we only care about lookups. Annotated inet_getpeer() and friends. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
/*
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* INETPEER - A storage for permanent information about peers
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*
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* Version: $Id: inetpeer.h,v 1.2 2002/01/12 07:54:56 davem Exp $
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*
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* Authors: Andrey V. Savochkin <saw@msu.ru>
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*/
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#ifndef _NET_INETPEER_H
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#define _NET_INETPEER_H
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/jiffies.h>
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#include <linux/spinlock.h>
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#include <asm/atomic.h>
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struct inet_peer
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{
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struct inet_peer *avl_left, *avl_right;
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struct inet_peer *unused_next, **unused_prevp;
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unsigned long dtime; /* the time of last use of not
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* referenced entries */
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atomic_t refcnt;
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__be32 v4daddr; /* peer's address */
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__u16 avl_height;
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__u16 ip_id_count; /* IP ID for the next packet */
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atomic_t rid; /* Frag reception counter */
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__u32 tcp_ts;
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unsigned long tcp_ts_stamp;
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};
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void inet_initpeers(void) __init;
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/* can be called with or without local BH being disabled */
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struct inet_peer *inet_getpeer(__be32 daddr, int create);
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extern spinlock_t inet_peer_unused_lock;
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extern struct inet_peer **inet_peer_unused_tailp;
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/* can be called from BH context or outside */
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static inline void inet_putpeer(struct inet_peer *p)
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{
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spin_lock_bh(&inet_peer_unused_lock);
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if (atomic_dec_and_test(&p->refcnt)) {
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p->unused_prevp = inet_peer_unused_tailp;
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p->unused_next = NULL;
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*inet_peer_unused_tailp = p;
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inet_peer_unused_tailp = &p->unused_next;
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p->dtime = jiffies;
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}
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spin_unlock_bh(&inet_peer_unused_lock);
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}
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extern spinlock_t inet_peer_idlock;
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/* can be called with or without local BH being disabled */
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static inline __u16 inet_getid(struct inet_peer *p, int more)
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{
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__u16 id;
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spin_lock_bh(&inet_peer_idlock);
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id = p->ip_id_count;
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p->ip_id_count += 1 + more;
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spin_unlock_bh(&inet_peer_idlock);
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return id;
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}
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#endif /* _NET_INETPEER_H */
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