[deliverable/linux.git] / include / net / arp.h

/* linux/net/inet/arp.h */
#ifndef _ARP_H
#define _ARP_H

#include <linux/if_arp.h>
#include <net/neighbour.h>


extern struct neigh_table arp_tbl;

static inline u32 arp_hashfn(u32 key, const struct net_device *dev, u32 hash_rnd)
{
	u32 val = key ^ dev->ifindex;

	return val * hash_rnd;
}

static inline struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key)
{
	struct neigh_hash_table *nht = rcu_dereference_bh(arp_tbl.nht);
	struct neighbour *n;
	u32 hash_val;

	hash_val = arp_hashfn(key, dev, nht->hash_rnd[0]) >> (32 - nht->hash_shift);
	for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
	     n != NULL;
	     n = rcu_dereference_bh(n->next)) {
		if (n->dev == dev && *(u32 *)n->primary_key == key)
			return n;
	}

	return NULL;
}

static inline struct neighbour *__ipv4_neigh_lookup(struct net_device *dev, u32 key)
{
	struct neighbour *n;

	rcu_read_lock_bh();
	n = __ipv4_neigh_lookup_noref(dev, key);
	if (n && !atomic_inc_not_zero(&n->refcnt))
		n = NULL;
	rcu_read_unlock_bh();

	return n;
}

extern void	arp_init(void);
extern int	arp_find(unsigned char *haddr, struct sk_buff *skb);
extern int	arp_ioctl(struct net *net, unsigned int cmd, void __user *arg);
extern void     arp_send(int type, int ptype, __be32 dest_ip,
			 struct net_device *dev, __be32 src_ip,
			 const unsigned char *dest_hw,
			 const unsigned char *src_hw, const unsigned char *th);
extern int	arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir);
extern void	arp_ifdown(struct net_device *dev);

extern struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
				  struct net_device *dev, __be32 src_ip,
				  const unsigned char *dest_hw,
				  const unsigned char *src_hw,
				  const unsigned char *target_hw);
extern void arp_xmit(struct sk_buff *skb);
int arp_invalidate(struct net_device *dev, __be32 ip);

#endif	/* _ARP_H */
Commit	Line	Data
	1	/* linux/net/inet/arp.h */
	2	#ifndef _ARP_H
	3	#define _ARP_H
	4
	5	#include <linux/if_arp.h>
	6	#include <net/neighbour.h>
	7
	8
	9	extern struct neigh_table arp_tbl;
	10
	11	static inline u32 arp_hashfn(u32 key, const struct net_device *dev, u32 hash_rnd)
	12	{
	13	u32 val = key ^ dev->ifindex;
	14
	15	return val * hash_rnd;
	16	}
	17
	18	static inline struct neighbour __ipv4_neigh_lookup_noref(struct net_device dev, u32 key)
	19	{
	20	struct neigh_hash_table *nht = rcu_dereference_bh(arp_tbl.nht);
	21	struct neighbour *n;
	22	u32 hash_val;
	23
	24	hash_val = arp_hashfn(key, dev, nht->hash_rnd[0]) >> (32 - nht->hash_shift);
	25	for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
	26	n != NULL;
	27	n = rcu_dereference_bh(n->next)) {
	28	if (n->dev == dev && (u32 )n->primary_key == key)
	29	return n;
	30	}
	31
	32	return NULL;
	33	}
	34
	35	static inline struct neighbour __ipv4_neigh_lookup(struct net_device dev, u32 key)
	36	{
	37	struct neighbour *n;
	38
	39	rcu_read_lock_bh();
	40	n = __ipv4_neigh_lookup_noref(dev, key);
	41	if (n && !atomic_inc_not_zero(&n->refcnt))
	42	n = NULL;
	43	rcu_read_unlock_bh();
	44
	45	return n;
	46	}
	47
	48	extern void arp_init(void);
	49	extern int arp_find(unsigned char haddr, struct sk_buff skb);
	50	extern int arp_ioctl(struct net net, unsigned int cmd, void __user arg);
	51	extern void arp_send(int type, int ptype, __be32 dest_ip,
	52	struct net_device *dev, __be32 src_ip,
	53	const unsigned char *dest_hw,
	54	const unsigned char src_hw, const unsigned char th);
	55	extern int arp_mc_map(__be32 addr, u8 haddr, struct net_device dev, int dir);
	56	extern void arp_ifdown(struct net_device *dev);
	57
	58	extern struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
	59	struct net_device *dev, __be32 src_ip,
	60	const unsigned char *dest_hw,
	61	const unsigned char *src_hw,
	62	const unsigned char *target_hw);
	63	extern void arp_xmit(struct sk_buff *skb);
	64	int arp_invalidate(struct net_device *dev, __be32 ip);
	65
	66	#endif /* _ARP_H */