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 if (dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))
27 hash_val = arp_hashfn(key, dev, nht->hash_rnd[0]) >> (32 - nht->hash_shift);
28 for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
30 n = rcu_dereference_bh(n->next)) {
31 if (n->dev == dev && *(u32 *)n->primary_key == key)
38 static inline struct neighbour *__ipv4_neigh_lookup(struct net_device *dev, u32 key)
43 n = __ipv4_neigh_lookup_noref(dev, key);
44 if (n && !atomic_inc_not_zero(&n->refcnt))
51 extern void arp_init(void);
52 extern int arp_find(unsigned char *haddr, struct sk_buff *skb);
53 extern int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg);
54 extern void arp_send(int type, int ptype, __be32 dest_ip,
55 struct net_device *dev, __be32 src_ip,
56 const unsigned char *dest_hw,
57 const unsigned char *src_hw, const unsigned char *th);
58 extern int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir);
59 extern void arp_ifdown(struct net_device *dev);
61 extern struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
62 struct net_device *dev, __be32 src_ip,
63 const unsigned char *dest_hw,
64 const unsigned char *src_hw,
65 const unsigned char *target_hw);
66 extern void arp_xmit(struct sk_buff *skb);
67 int arp_invalidate(struct net_device *dev, __be32 ip);