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[mirror_ubuntu-bionic-kernel.git] / include / net / 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
11 extern struct neigh_table arp_tbl;
12
13 static 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 static 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
26 static 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
39 static 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
55 void arp_init(void);
56 int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg);
57 void 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);
61 int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir);
62 void arp_ifdown(struct net_device *dev);
63
64 struct 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);
69 void arp_xmit(struct sk_buff *skb);
70
71 #endif /* _ARP_H */