LXR 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
  10extern struct neigh_table arp_tbl;
  11
  12static 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
  20static 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
  25static 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
  38void arp_init(void);
  39int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg);
  40void 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);
  44int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir);
  45void arp_ifdown(struct net_device *dev);
  46
  47struct 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);
  52void arp_xmit(struct sk_buff *skb);
  53
  54#endif  /* _ARP_H */
  55