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Linux/include/net/arp.h

  1 /* linux/net/inet/arp.h */
  2 #ifndef _ARP_H
  3 #define _ARP_H
  4 
  5 #include <linux/if_arp.h>
  6 #include <linux/hash.h>
  7 #include <net/neighbour.h>
  8 
  9 
 10 extern struct neigh_table arp_tbl;
 11 
 12 static inline u32 arp_hashfn(const void *pkey, const struct net_device *dev, u32 *hash_rnd)
 13 {
 14         u32 key = *(const u32 *)pkey;
 15         u32 val = key ^ hash32_ptr(dev);
 16 
 17         return val * hash_rnd[0];
 18 }
 19 
 20 static inline struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key)
 21 {
 22         return ___neigh_lookup_noref(&arp_tbl, neigh_key_eq32, arp_hashfn, &key, dev);
 23 }
 24 
 25 static inline struct neighbour *__ipv4_neigh_lookup(struct net_device *dev, u32 key)
 26 {
 27         struct neighbour *n;
 28 
 29         rcu_read_lock_bh();
 30         n = __ipv4_neigh_lookup_noref(dev, key);
 31         if (n && !atomic_inc_not_zero(&n->refcnt))
 32                 n = NULL;
 33         rcu_read_unlock_bh();
 34 
 35         return n;
 36 }
 37 
 38 void arp_init(void);
 39 int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg);
 40 void arp_send(int type, int ptype, __be32 dest_ip,
 41               struct net_device *dev, __be32 src_ip,
 42               const unsigned char *dest_hw,
 43               const unsigned char *src_hw, const unsigned char *th);
 44 int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir);
 45 void arp_ifdown(struct net_device *dev);
 46 
 47 struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
 48                            struct net_device *dev, __be32 src_ip,
 49                            const unsigned char *dest_hw,
 50                            const unsigned char *src_hw,
 51                            const unsigned char *target_hw);
 52 void arp_xmit(struct sk_buff *skb);
 53 
 54 #endif  /* _ARP_H */
 55 

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