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 | 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 | |
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); |
35 | if (n && !refcount_inc_not_zero(&n->refcnt)) |
36 | n = NULL; |
37 | rcu_read_unlock_bh(); |
38 | |
39 | return n; |
40 | } |
41 | |
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 | |
58 | void arp_init(void); |
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); |
66 | |
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); |
73 | |
74 | #endif /* _ARP_H */ |
75 | |