Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2/* linux/net/inet/arp.h */
3#ifndef _ARP_H
4#define _ARP_H
5
6#include <linux/if_arp.h>
7#include <linux/hash.h>
8#include <net/neighbour.h>
9
10
11extern struct neigh_table arp_tbl;
12
13static inline u32 arp_hashfn(const void *pkey, const struct net_device *dev, u32 *hash_rnd)
14{
15 u32 key = *(const u32 *)pkey;
16 u32 val = key ^ hash32_ptr(dev);
17
18 return val * hash_rnd[0];
19}
20
21static inline struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key)
22{
23 return ___neigh_lookup_noref(&arp_tbl, neigh_key_eq32, arp_hashfn, &key, dev);
24}
25
26static inline struct neighbour *__ipv4_neigh_lookup(struct net_device *dev, u32 key)
27{
28 struct neighbour *n;
29
30 rcu_read_lock_bh();
31 n = __ipv4_neigh_lookup_noref(dev, key);
32 if (n && !refcount_inc_not_zero(&n->refcnt))
33 n = NULL;
34 rcu_read_unlock_bh();
35
36 return n;
37}
38
39static inline void __ipv4_confirm_neigh(struct net_device *dev, u32 key)
40{
41 struct neighbour *n;
42
43 rcu_read_lock_bh();
44 n = __ipv4_neigh_lookup_noref(dev, key);
45 if (n) {
46 unsigned long now = jiffies;
47
48 /* avoid dirtying neighbour */
49 if (n->confirmed != now)
50 n->confirmed = now;
51 }
52 rcu_read_unlock_bh();
53}
54
55void arp_init(void);
56int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg);
57void arp_send(int type, int ptype, __be32 dest_ip,
58 struct net_device *dev, __be32 src_ip,
59 const unsigned char *dest_hw,
60 const unsigned char *src_hw, const unsigned char *th);
61int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir);
62void arp_ifdown(struct net_device *dev);
63
64struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
65 struct net_device *dev, __be32 src_ip,
66 const unsigned char *dest_hw,
67 const unsigned char *src_hw,
68 const unsigned char *target_hw);
69void arp_xmit(struct sk_buff *skb);
70
71#endif /* _ARP_H */