blob: 4950191f6b2bf424519c7ecf3483336739fea143 [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001/* SPDX-License-Identifier: GPL-2.0 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/* linux/net/inet/arp.h */
3#ifndef _ARP_H
4#define _ARP_H
5
6#include <linux/if_arp.h>
Pavel Emelyanovb14f2432012-08-08 21:52:28 +00007#include <linux/hash.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008#include <net/neighbour.h>
9
Linus Torvalds1da177e2005-04-16 15:20:36 -070010
11extern struct neigh_table arp_tbl;
12
Eric W. Biederman60395a22015-03-03 17:10:44 -060013static inline u32 arp_hashfn(const void *pkey, const struct net_device *dev, u32 *hash_rnd)
David S. Millerf610b742011-07-11 01:37:28 -070014{
Eric W. Biederman60395a22015-03-03 17:10:44 -060015 u32 key = *(const u32 *)pkey;
Pavel Emelyanovb14f2432012-08-08 21:52:28 +000016 u32 val = key ^ hash32_ptr(dev);
David S. Millerf610b742011-07-11 01:37:28 -070017
Eric W. Biederman60395a22015-03-03 17:10:44 -060018 return val * hash_rnd[0];
David S. Millerf610b742011-07-11 01:37:28 -070019}
20
David Ahern9b3040a2019-05-05 11:16:20 -070021#ifdef CONFIG_INET
David S. Millera263b302012-07-02 02:02:15 -070022static inline struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key)
David Miller3769cff2011-07-11 22:44:24 +000023{
Jim Westfallcd9ff4d2018-01-14 04:18:51 -080024 if (dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))
25 key = INADDR_ANY;
26
Eric W. Biederman60395a22015-03-03 17:10:44 -060027 return ___neigh_lookup_noref(&arp_tbl, neigh_key_eq32, arp_hashfn, &key, dev);
David S. Millera263b302012-07-02 02:02:15 -070028}
David Ahern9b3040a2019-05-05 11:16:20 -070029#else
30static inline
31struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key)
32{
33 return NULL;
34}
35#endif
David S. Millera263b302012-07-02 02:02:15 -070036
37static inline struct neighbour *__ipv4_neigh_lookup(struct net_device *dev, u32 key)
38{
39 struct neighbour *n;
40
41 rcu_read_lock_bh();
42 n = __ipv4_neigh_lookup_noref(dev, key);
Reshetova, Elena9f237432017-06-30 13:07:55 +030043 if (n && !refcount_inc_not_zero(&n->refcnt))
David S. Millera263b302012-07-02 02:02:15 -070044 n = NULL;
David Miller3769cff2011-07-11 22:44:24 +000045 rcu_read_unlock_bh();
46
47 return n;
48}
49
Julian Anastasov63fca652017-02-06 23:14:15 +020050static inline void __ipv4_confirm_neigh(struct net_device *dev, u32 key)
51{
52 struct neighbour *n;
53
54 rcu_read_lock_bh();
55 n = __ipv4_neigh_lookup_noref(dev, key);
56 if (n) {
57 unsigned long now = jiffies;
58
59 /* avoid dirtying neighbour */
Eric Dumazet25c7a6d2019-11-05 14:11:51 -080060 if (READ_ONCE(n->confirmed) != now)
61 WRITE_ONCE(n->confirmed, now);
Julian Anastasov63fca652017-02-06 23:14:15 +020062 }
63 rcu_read_unlock_bh();
64}
65
Joe Perches90972b22013-07-31 17:31:35 -070066void arp_init(void);
Joe Perches90972b22013-07-31 17:31:35 -070067int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg);
68void arp_send(int type, int ptype, __be32 dest_ip,
69 struct net_device *dev, __be32 src_ip,
70 const unsigned char *dest_hw,
71 const unsigned char *src_hw, const unsigned char *th);
72int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir);
73void arp_ifdown(struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
Joe Perches90972b22013-07-31 17:31:35 -070075struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
76 struct net_device *dev, __be32 src_ip,
77 const unsigned char *dest_hw,
78 const unsigned char *src_hw,
79 const unsigned char *target_hw);
80void arp_xmit(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
Linus Torvalds1da177e2005-04-16 15:20:36 -070082#endif /* _ARP_H */