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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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
Linus Torvalds1da177e2005-04-16 15:20:36 -07008
9extern struct neigh_table arp_tbl;
10
David S. Millerf610b742011-07-11 01:37:28 -070011static 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
David S. Miller80703d22012-02-15 17:48:35 -050018static inline struct neighbour *__ipv4_neigh_lookup(struct net_device *dev, u32 key)
David Miller3769cff2011-07-11 22:44:24 +000019{
20 struct neigh_hash_table *nht;
21 struct neighbour *n;
22 u32 hash_val;
23
24 rcu_read_lock_bh();
David S. Miller80703d22012-02-15 17:48:35 -050025 nht = rcu_dereference_bh(arp_tbl.nht);
David S. Miller2c2aba62011-12-28 15:06:58 -050026 hash_val = arp_hashfn(key, dev, nht->hash_rnd[0]) >> (32 - nht->hash_shift);
David Miller3769cff2011-07-11 22:44:24 +000027 for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
28 n != NULL;
29 n = rcu_dereference_bh(n->next)) {
30 if (n->dev == dev && *(u32 *)n->primary_key == key) {
31 if (!atomic_inc_not_zero(&n->refcnt))
32 n = NULL;
33 break;
34 }
35 }
36 rcu_read_unlock_bh();
37
38 return n;
39}
40
Linus Torvalds1da177e2005-04-16 15:20:36 -070041extern void arp_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070042extern int arp_find(unsigned char *haddr, struct sk_buff *skb);
Pavel Emelyanov32e569b2007-12-16 13:30:39 -080043extern int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg);
Al Viroed9bad02006-09-27 18:36:36 -070044extern void arp_send(int type, int ptype, __be32 dest_ip,
45 struct net_device *dev, __be32 src_ip,
Jan Engelhardtabfdf1c2008-01-31 03:59:24 -080046 const unsigned char *dest_hw,
47 const unsigned char *src_hw, const unsigned char *th);
Al Viro714e85b2006-11-14 20:51:49 -080048extern int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -070049extern void arp_ifdown(struct net_device *dev);
50
Al Viroed9bad02006-09-27 18:36:36 -070051extern struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
52 struct net_device *dev, __be32 src_ip,
Jan Engelhardtabfdf1c2008-01-31 03:59:24 -080053 const unsigned char *dest_hw,
54 const unsigned char *src_hw,
55 const unsigned char *target_hw);
Linus Torvalds1da177e2005-04-16 15:20:36 -070056extern void arp_xmit(struct sk_buff *skb);
Maxim Levitsky545ecdc2011-01-08 13:57:12 +000057int arp_invalidate(struct net_device *dev, __be32 ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Linus Torvalds1da177e2005-04-16 15:20:36 -070059#endif /* _ARP_H */