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 */

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