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Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | /* linux/net/inet/arp.h */ |
3 | #ifndef _ARP_H | |
4 | #define _ARP_H | |
5 | ||
6 | #include <linux/if_arp.h> | |
b14f243a | 7 | #include <linux/hash.h> |
1da177e4 LT |
8 | #include <net/neighbour.h> |
9 | ||
1da177e4 LT |
10 | |
11 | extern struct neigh_table arp_tbl; | |
12 | ||
60395a20 | 13 | static inline u32 arp_hashfn(const void *pkey, const struct net_device *dev, u32 *hash_rnd) |
f610b74b | 14 | { |
60395a20 | 15 | u32 key = *(const u32 *)pkey; |
b14f243a | 16 | u32 val = key ^ hash32_ptr(dev); |
f610b74b | 17 | |
60395a20 | 18 | return val * hash_rnd[0]; |
f610b74b DM |
19 | } |
20 | ||
a263b309 | 21 | static inline struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key) |
3769cffb | 22 | { |
cd9ff4de JW |
23 | if (dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) |
24 | key = INADDR_ANY; | |
25 | ||
60395a20 | 26 | return ___neigh_lookup_noref(&arp_tbl, neigh_key_eq32, arp_hashfn, &key, dev); |
a263b309 DM |
27 | } |
28 | ||
29 | static 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); | |
9f237430 | 35 | if (n && !refcount_inc_not_zero(&n->refcnt)) |
a263b309 | 36 | n = NULL; |
3769cffb DM |
37 | rcu_read_unlock_bh(); |
38 | ||
39 | return n; | |
40 | } | |
41 | ||
63fca65d JA |
42 | static 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 | ||
90972b22 | 58 | void arp_init(void); |
90972b22 JP |
59 | int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg); |
60 | void 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); | |
64 | int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir); | |
65 | void arp_ifdown(struct net_device *dev); | |
1da177e4 | 66 | |
90972b22 JP |
67 | struct 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); | |
72 | void arp_xmit(struct sk_buff *skb); | |
1da177e4 | 73 | |
1da177e4 | 74 | #endif /* _ARP_H */ |