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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(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 | |
19 | static 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 | |
36 | static 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 | |
49 | void arp_init(void); |
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); |
58 | |
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); |
65 | int arp_invalidate(struct net_device *dev, __be32 ip); |
66 | |
67 | #endif /* _ARP_H */ |
68 |
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