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 && !refcount_inc_not_zero(&n->refcnt))
  32                 n = NULL;
  33         rcu_read_unlock_bh();
  34
  35         return n;
  36 }
  37
  38 static inline void __ipv4_confirm_neigh(struct net_device *dev, u32 key)
  39 {
  40         struct neighbour *n;
  41
  42         rcu_read_lock_bh();
  43         n = __ipv4_neigh_lookup_noref(dev, key);
  44         if (n) {
  45                 unsigned long now = jiffies;
  46
  47                 /* avoid dirtying neighbour */
  48                 if (n->confirmed != now)
  49                         n->confirmed = now;
  50         }
  51         rcu_read_unlock_bh();
  52 }
  53
  54 void arp_init(void);
  55 int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg);
  56 void arp_send(int type, int ptype, __be32 dest_ip,
  57               struct net_device *dev, __be32 src_ip,
  58               const unsigned char *dest_hw,
  59               const unsigned char *src_hw, const unsigned char *th);
  60 int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir);
  61 void arp_ifdown(struct net_device *dev);
  62
  63 struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
  64                            struct net_device *dev, __be32 src_ip,
  65                            const unsigned char *dest_hw,
  66                            const unsigned char *src_hw,
  67                            const unsigned char *target_hw);
  68 void arp_xmit(struct sk_buff *skb);
  69
  70 #endif  /* _ARP_H */