Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 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(arp_tbl.nht);
26 hash_val = arp_hashfn(key, dev, nht->hash_rnd[0]) >> (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 */