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