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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>
Pavel Emelyanovb14f2432012-08-08 21:52:28 +00006#include <linux/hash.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007#include <net/neighbour.h>
8
Linus Torvalds1da177e2005-04-16 15:20:36 -07009
10extern struct neigh_table arp_tbl;
11
David S. Millerf610b742011-07-11 01:37:28 -070012static inline u32 arp_hashfn(u32 key, const struct net_device *dev, u32 hash_rnd)
13{
Pavel Emelyanovb14f2432012-08-08 21:52:28 +000014 u32 val = key ^ hash32_ptr(dev);
David S. Millerf610b742011-07-11 01:37:28 -070015
16 return val * hash_rnd;
17}
18
David S. Millera263b302012-07-02 02:02:15 -070019static inline struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key)
David Miller3769cff2011-07-11 22:44:24 +000020{
David S. Millera263b302012-07-02 02:02:15 -070021 struct neigh_hash_table *nht = rcu_dereference_bh(arp_tbl.nht);
David Miller3769cff2011-07-11 22:44:24 +000022 struct neighbour *n;
23 u32 hash_val;
24
David S. Miller2c2aba62011-12-28 15:06:58 -050025 hash_val = arp_hashfn(key, dev, nht->hash_rnd[0]) >> (32 - nht->hash_shift);
David Miller3769cff2011-07-11 22:44:24 +000026 for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
27 n != NULL;
28 n = rcu_dereference_bh(n->next)) {
David S. Millera263b302012-07-02 02:02:15 -070029 if (n->dev == dev && *(u32 *)n->primary_key == key)
30 return n;
David Miller3769cff2011-07-11 22:44:24 +000031 }
David S. Millera263b302012-07-02 02:02:15 -070032
33 return NULL;
34}
35
36static 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;
David Miller3769cff2011-07-11 22:44:24 +000044 rcu_read_unlock_bh();
45
46 return n;
47}
48
Linus Torvalds1da177e2005-04-16 15:20:36 -070049extern void arp_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070050extern int arp_find(unsigned char *haddr, struct sk_buff *skb);
Pavel Emelyanov32e569b2007-12-16 13:30:39 -080051extern int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg);
Al Viroed9bad02006-09-27 18:36:36 -070052extern void arp_send(int type, int ptype, __be32 dest_ip,
53 struct net_device *dev, __be32 src_ip,
Jan Engelhardtabfdf1c2008-01-31 03:59:24 -080054 const unsigned char *dest_hw,
55 const unsigned char *src_hw, const unsigned char *th);
Al Viro714e85b2006-11-14 20:51:49 -080056extern int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057extern void arp_ifdown(struct net_device *dev);
58
Al Viroed9bad02006-09-27 18:36:36 -070059extern struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
60 struct net_device *dev, __be32 src_ip,
Jan Engelhardtabfdf1c2008-01-31 03:59:24 -080061 const unsigned char *dest_hw,
62 const unsigned char *src_hw,
63 const unsigned char *target_hw);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064extern void arp_xmit(struct sk_buff *skb);
Maxim Levitsky545ecdc2011-01-08 13:57:12 +000065int arp_invalidate(struct net_device *dev, __be32 ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#endif /* _ARP_H */