1 /* 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 8 9 extern struct neigh_table arp_tbl; 10 11 static 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 18 static inline struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key) 19 { 20 struct neigh_hash_table *nht = rcu_dereference_bh(arp_tbl.nht); 21 struct neighbour *n; 22 u32 hash_val; 23 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]); 26 n != NULL; 27 n = rcu_dereference_bh(n->next)) { 28 if (n->dev == dev && *(u32 *)n->primary_key == key) 29 return n; 30 } 31 32 return NULL; 33 } 34 35 static inline struct neighbour *__ipv4_neigh_lookup(struct net_device *dev, u32 key) 36 { 37 struct neighbour *n; 38 39 rcu_read_lock_bh(); 40 n = __ipv4_neigh_lookup_noref(dev, key); 41 if (n && !atomic_inc_not_zero(&n->refcnt)) 42 n = NULL; 43 rcu_read_unlock_bh(); 44 45 return n; 46 } 47 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); 57 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); 65 66 #endif /* _ARP_H */ 67