1 /* linux/net/inet/arp.h */
5 #include <linux/if_arp.h>
6 #include <net/neighbour.h>
9 extern struct neigh_table arp_tbl;
11 static inline u32 arp_hashfn(u32 key, const struct net_device *dev, u32 hash_rnd)
13 u32 val = key ^ dev->ifindex;
15 return val * hash_rnd;
18 static inline struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key)
20 struct neigh_hash_table *nht = rcu_dereference_bh(arp_tbl.nht);
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]);
27 n = rcu_dereference_bh(n->next)) {
28 if (n->dev == dev && *(u32 *)n->primary_key == key)
35 static inline struct neighbour *__ipv4_neigh_lookup(struct net_device *dev, u32 key)
40 n = __ipv4_neigh_lookup_noref(dev, key);
41 if (n && !atomic_inc_not_zero(&n->refcnt))
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);
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);