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

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

#include <linux/if_arp.h>
#include <linux/hash.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 ^ hash32_ptr(dev);

	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;
}

void arp_init(void);
int arp_find(unsigned char *haddr, struct sk_buff *skb);
int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg);
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);
int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir);
void arp_ifdown(struct net_device *dev);

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);
void arp_xmit(struct sk_buff *skb);

#endif	/* _ARP_H */
Commit	Line	Data
1da177e4 LT	1	/* linux/net/inet/arp.h */
	2	#ifndef _ARP_H
	3	#define _ARP_H
	4
	5	#include <linux/if_arp.h>
b14f243a	6	#include <linux/hash.h>
1da177e4 LT	7	#include <net/neighbour.h>
1da177e4 LT	8
1da177e4 LT	9
	10	extern struct neigh_table arp_tbl;
	11
f610b74b DM	12	static inline u32 arp_hashfn(u32 key, const struct net_device *dev, u32 hash_rnd)
f610b74b DM	13	{
b14f243a	14	u32 val = key ^ hash32_ptr(dev);
f610b74b DM	15
	16	return val * hash_rnd;
	17	}
	18
a263b309	19	static inline struct neighbour __ipv4_neigh_lookup_noref(struct net_device dev, u32 key)
3769cffb	20	{
a263b309	21	struct neigh_hash_table *nht = rcu_dereference_bh(arp_tbl.nht);
3769cffb DM	22	struct neighbour *n;
	23	u32 hash_val;
	24
2c2aba6c	25	hash_val = arp_hashfn(key, dev, nht->hash_rnd[0]) >> (32 - nht->hash_shift);
3769cffb DM	26	for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
	27	n != NULL;
	28	n = rcu_dereference_bh(n->next)) {
a263b309 DM	29	if (n->dev == dev && (u32 )n->primary_key == key)
a263b309 DM	30	return n;
3769cffb	31	}
a263b309 DM	32
	33	return NULL;
	34	}
	35
	36	static inline struct neighbour __ipv4_neigh_lookup(struct net_device dev, u32 key)
	37	{
	38	struct neighbour *n;
	39
	40	rcu_read_lock_bh();
	41	n = __ipv4_neigh_lookup_noref(dev, key);
	42	if (n && !atomic_inc_not_zero(&n->refcnt))
	43	n = NULL;
3769cffb DM	44	rcu_read_unlock_bh();
	45
	46	return n;
	47	}
	48
90972b22 JP	49	void arp_init(void);
	50	int arp_find(unsigned char haddr, struct sk_buff skb);
	51	int arp_ioctl(struct net net, unsigned int cmd, void __user arg);
	52	void arp_send(int type, int ptype, __be32 dest_ip,
	53	struct net_device *dev, __be32 src_ip,
	54	const unsigned char *dest_hw,
	55	const unsigned char src_hw, const unsigned char th);
	56	int arp_mc_map(__be32 addr, u8 haddr, struct net_device dev, int dir);
	57	void arp_ifdown(struct net_device *dev);
1da177e4	58
90972b22 JP	59	struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
	60	struct net_device *dev, __be32 src_ip,
	61	const unsigned char *dest_hw,
	62	const unsigned char *src_hw,
	63	const unsigned char *target_hw);
	64	void arp_xmit(struct sk_buff *skb);
1da177e4	65
1da177e4	66	#endif /* _ARP_H */