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 <linux/hash.h>
7#include <net/neighbour.h>
8
9
10extern struct neigh_table arp_tbl;
11
12static inline u32 arp_hashfn(const void *pkey, const struct net_device *dev, u32 *hash_rnd)
13{
14 u32 key = *(const u32 *)pkey;
15 u32 val = key ^ hash32_ptr(dev);
16
17 return val * hash_rnd[0];
18}
19
20static inline struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key)
21{
22 return ___neigh_lookup_noref(&arp_tbl, neigh_key_eq32, arp_hashfn, &key, dev);
23}
24
25static inline struct neighbour *__ipv4_neigh_lookup(struct net_device *dev, u32 key)
26{
27 struct neighbour *n;
28
29 rcu_read_lock_bh();
30 n = __ipv4_neigh_lookup_noref(dev, key);
31 if (n && !refcount_inc_not_zero(&n->refcnt))
32 n = NULL;
33 rcu_read_unlock_bh();
34
35 return n;
36}
37
38static inline void __ipv4_confirm_neigh(struct net_device *dev, u32 key)
39{
40 struct neighbour *n;
41
42 rcu_read_lock_bh();
43 n = __ipv4_neigh_lookup_noref(dev, key);
44 if (n) {
45 unsigned long now = jiffies;
46
47 /* avoid dirtying neighbour */
48 if (n->confirmed != now)
49 n->confirmed = now;
50 }
51 rcu_read_unlock_bh();
52}
53
54void arp_init(void);
55int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg);
56void arp_send(int type, int ptype, __be32 dest_ip,
57 struct net_device *dev, __be32 src_ip,
58 const unsigned char *dest_hw,
59 const unsigned char *src_hw, const unsigned char *th);
60int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir);
61void arp_ifdown(struct net_device *dev);
62
63struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
64 struct net_device *dev, __be32 src_ip,
65 const unsigned char *dest_hw,
66 const unsigned char *src_hw,
67 const unsigned char *target_hw);
68void arp_xmit(struct sk_buff *skb);
69
70#endif /* _ARP_H */