/* linux/net/inet/arp.h */ #ifndef _ARP_H #define _ARP_H #include <linux/if_arp.h> #include <net/neighbour.h> extern struct neigh_table arp_tbl; static inline u32 arp_hashfn(u32 key, const struct net_device *dev, u32 hash_rnd) { u32 val = key ^ dev->ifindex; return val * hash_rnd; } static inline struct neighbour *__ipv4_neigh_lookup(struct net_device *dev, u32 key) { struct neigh_hash_table *nht; struct neighbour *n; u32 hash_val; rcu_read_lock_bh(); nht = rcu_dereference_bh(arp_tbl.nht); hash_val = arp_hashfn(key, dev, nht->hash_rnd[0]) >> (32 - nht->hash_shift); for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); n != NULL; n = rcu_dereference_bh(n->next)) { if (n->dev == dev && *(u32 *)n->primary_key == key) { if (!atomic_inc_not_zero(&n->refcnt)) n = NULL; break; } } rcu_read_unlock_bh(); return n; } extern void arp_init(void); extern int arp_find(unsigned char *haddr, struct sk_buff *skb); extern int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg); extern void arp_send(int type, int ptype, __be32 dest_ip, struct net_device *dev, __be32 src_ip, const unsigned char *dest_hw, const unsigned char *src_hw, const unsigned char *th); extern int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir); extern void arp_ifdown(struct net_device *dev); extern struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip, struct net_device *dev, __be32 src_ip, const unsigned char *dest_hw, const unsigned char *src_hw, const unsigned char *target_hw); extern void arp_xmit(struct sk_buff *skb); int arp_invalidate(struct net_device *dev, __be32 ip); #endif /* _ARP_H */