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
21#ifdef CONFIG_INET
22static inline struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key)
23{
24	if (dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))
25		key = INADDR_ANY;
26
27	return ___neigh_lookup_noref(&arp_tbl, neigh_key_eq32, arp_hashfn, &key, dev);
28}
29#else
30static inline
31struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key)
32{
33	return NULL;
34}
35#endif
36
37static inline struct neighbour *__ipv4_neigh_lookup(struct net_device *dev, u32 key)
38{
39	struct neighbour *n;
40
41	rcu_read_lock();
42	n = __ipv4_neigh_lookup_noref(dev, key);
43	if (n && !refcount_inc_not_zero(&n->refcnt))
44		n = NULL;
45	rcu_read_unlock();
46
47	return n;
48}
49
50static inline void __ipv4_confirm_neigh(struct net_device *dev, u32 key)
51{
52	struct neighbour *n;
53
54	rcu_read_lock();
55	n = __ipv4_neigh_lookup_noref(dev, key);
56	neigh_confirm(n);
57	rcu_read_unlock();
58}
59
60void arp_init(void);
61int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg);
62void arp_send(int type, int ptype, __be32 dest_ip,
63	      struct net_device *dev, __be32 src_ip,
64	      const unsigned char *dest_hw,
65	      const unsigned char *src_hw, const unsigned char *th);
66int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir);
67void arp_ifdown(struct net_device *dev);
68int arp_invalidate(struct net_device *dev, __be32 ip, bool force);
69
70struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
71			   struct net_device *dev, __be32 src_ip,
72			   const unsigned char *dest_hw,
73			   const unsigned char *src_hw,
74			   const unsigned char *target_hw);
75void arp_xmit(struct sk_buff *skb);
76
77#endif	/* _ARP_H */

 
 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 && !atomic_inc_not_zero(&n->refcnt))
32		n = NULL;
33	rcu_read_unlock_bh();
34
35	return n;
36}
37
 
 
 
 
 
 
 
 
 
 
38void arp_init(void);
39int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg);
40void arp_send(int type, int ptype, __be32 dest_ip,
41	      struct net_device *dev, __be32 src_ip,
42	      const unsigned char *dest_hw,
43	      const unsigned char *src_hw, const unsigned char *th);
44int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir);
45void arp_ifdown(struct net_device *dev);
 
46
47struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
48			   struct net_device *dev, __be32 src_ip,
49			   const unsigned char *dest_hw,
50			   const unsigned char *src_hw,
51			   const unsigned char *target_hw);
52void arp_xmit(struct sk_buff *skb);
53
54#endif	/* _ARP_H */