1 /* linux/net/inet/arp.h */
5 #include <linux/if_arp.h>
6 #include <linux/hash.h>
7 #include <net/neighbour.h>
10 extern struct neigh_table arp_tbl
;
12 static inline u32
arp_hashfn(u32 key
, const struct net_device
*dev
, u32 hash_rnd
)
14 u32 val
= key
^ hash32_ptr(dev
);
16 return val
* hash_rnd
;
19 static inline struct neighbour
*__ipv4_neigh_lookup_noref(struct net_device
*dev
, u32 key
)
21 struct neigh_hash_table
*nht
= rcu_dereference_bh(arp_tbl
.nht
);
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
]);
28 n
= rcu_dereference_bh(n
->next
)) {
29 if (n
->dev
== dev
&& *(u32
*)n
->primary_key
== key
)
36 static inline struct neighbour
*__ipv4_neigh_lookup(struct net_device
*dev
, u32 key
)
41 n
= __ipv4_neigh_lookup_noref(dev
, key
);
42 if (n
&& !atomic_inc_not_zero(&n
->refcnt
))
50 int arp_find(unsigned char *haddr
, struct sk_buff
*skb
);
51 int arp_ioctl(struct net
*net
, unsigned int cmd
, void __user
*arg
);
52 void 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
);
56 int arp_mc_map(__be32 addr
, u8
*haddr
, struct net_device
*dev
, int dir
);
57 void arp_ifdown(struct net_device
*dev
);
59 struct 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
);
64 void arp_xmit(struct sk_buff
*skb
);
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