Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
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);
65int arp_invalidate(struct net_device *dev, __be32 ip);
66
67#endif /* _ARP_H */