linux/include/net/arp.h
<<
>>
Prefs
   1/* linux/net/inet/arp.h */
   2#ifndef _ARP_H
   3#define _ARP_H
   4
   5#include <linux/if_arp.h>
   6#include <net/neighbour.h>
   7
   8
   9extern struct neigh_table arp_tbl;
  10
  11static inline u32 arp_hashfn(u32 key, const struct net_device *dev, u32 hash_rnd)
  12{
  13        u32 val = key ^ dev->ifindex;
  14
  15        return val * hash_rnd;
  16}
  17
  18static inline struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key)
  19{
  20        struct neigh_hash_table *nht = rcu_dereference_bh(arp_tbl.nht);
  21        struct neighbour *n;
  22        u32 hash_val;
  23
  24        hash_val = arp_hashfn(key, dev, nht->hash_rnd[0]) >> (32 - nht->hash_shift);
  25        for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
  26             n != NULL;
  27             n = rcu_dereference_bh(n->next)) {
  28                if (n->dev == dev && *(u32 *)n->primary_key == key)
  29                        return n;
  30        }
  31
  32        return NULL;
  33}
  34
  35static inline struct neighbour *__ipv4_neigh_lookup(struct net_device *dev, u32 key)
  36{
  37        struct neighbour *n;
  38
  39        rcu_read_lock_bh();
  40        n = __ipv4_neigh_lookup_noref(dev, key);
  41        if (n && !atomic_inc_not_zero(&n->refcnt))
  42                n = NULL;
  43        rcu_read_unlock_bh();
  44
  45        return n;
  46}
  47
  48extern void     arp_init(void);
  49extern int      arp_find(unsigned char *haddr, struct sk_buff *skb);
  50extern int      arp_ioctl(struct net *net, unsigned int cmd, void __user *arg);
  51extern void     arp_send(int type, int ptype, __be32 dest_ip,
  52                         struct net_device *dev, __be32 src_ip,
  53                         const unsigned char *dest_hw,
  54                         const unsigned char *src_hw, const unsigned char *th);
  55extern int      arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir);
  56extern void     arp_ifdown(struct net_device *dev);
  57
  58extern struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
  59                                  struct net_device *dev, __be32 src_ip,
  60                                  const unsigned char *dest_hw,
  61                                  const unsigned char *src_hw,
  62                                  const unsigned char *target_hw);
  63extern void arp_xmit(struct sk_buff *skb);
  64int arp_invalidate(struct net_device *dev, __be32 ip);
  65
  66#endif  /* _ARP_H */
  67
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.