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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(u32 key, const struct net_device *dev, u32 hash_rnd)
 13 {
 14         u32 val = key ^ hash32_ptr(dev);
 15 
 16         return val * hash_rnd;
 17 }
 18 
 19 static inline struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key)
 20 {
 21         struct neigh_hash_table *nht = rcu_dereference_bh(arp_tbl.nht);
 22         struct neighbour *n;
 23         u32 hash_val;
 24 
 25         hash_val = arp_hashfn(key, dev, nht->hash_rnd[0]) >> (32 - nht->hash_shift);
 26         for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
 27              n != NULL;
 28              n = rcu_dereference_bh(n->next)) {
 29                 if (n->dev == dev && *(u32 *)n->primary_key == key)
 30                         return n;
 31         }
 32 
 33         return NULL;
 34 }
 35 
 36 static inline struct neighbour *__ipv4_neigh_lookup(struct net_device *dev, u32 key)
 37 {
 38         struct neighbour *n;
 39 
 40         rcu_read_lock_bh();
 41         n = __ipv4_neigh_lookup_noref(dev, key);
 42         if (n && !atomic_inc_not_zero(&n->refcnt))
 43                 n = NULL;
 44         rcu_read_unlock_bh();
 45 
 46         return n;
 47 }
 48 
 49 void arp_init(void);
 50 int arp_find(unsigned char *haddr, struct sk_buff *skb);
 51 int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg);
 52 void arp_send(int type, int ptype, __be32 dest_ip,
 53               struct net_device *dev, __be32 src_ip,
 54               const unsigned char *dest_hw,
 55               const unsigned char *src_hw, const unsigned char *th);
 56 int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir);
 57 void arp_ifdown(struct net_device *dev);
 58 
 59 struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
 60                            struct net_device *dev, __be32 src_ip,
 61                            const unsigned char *dest_hw,
 62                            const unsigned char *src_hw,
 63                            const unsigned char *target_hw);
 64 void arp_xmit(struct sk_buff *skb);
 65 
 66 #endif  /* _ARP_H */
 67 

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