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(struct neigh_table *tbl, struct net_device *dev, u32 key)
20 struct neigh_hash_table *nht;
25 nht = rcu_dereference_bh(tbl->nht);
26 hash_val = arp_hashfn(key, dev, nht->hash_rnd) >> (32 - nht->hash_shift);
27 for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
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))
41 static inline struct neighbour *ipv4_neigh_lookup(struct neigh_table *tbl, struct net_device *dev, const __be32 *pkey)
43 struct neighbour *n = __ipv4_neigh_lookup(tbl, dev,
44 *(__force u32 *)pkey);
47 return neigh_create(tbl, pkey, dev);
50 extern void arp_init(void);
51 extern int arp_find(unsigned char *haddr, struct sk_buff *skb);
52 extern int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg);
53 extern void arp_send(int type, int ptype, __be32 dest_ip,
54 struct net_device *dev, __be32 src_ip,
55 const unsigned char *dest_hw,
56 const unsigned char *src_hw, const unsigned char *th);
57 extern int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir);
58 extern void arp_ifdown(struct net_device *dev);
60 extern struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
61 struct net_device *dev, __be32 src_ip,
62 const unsigned char *dest_hw,
63 const unsigned char *src_hw,
64 const unsigned char *target_hw);
65 extern void arp_xmit(struct sk_buff *skb);
66 int arp_invalidate(struct net_device *dev, __be32 ip);