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 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 */ 71