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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 | #ifdef CONFIG_INET | |
22 | static inline struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key) | |
23 | { | |
24 | if (dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) | |
25 | key = INADDR_ANY; | |
26 | ||
27 | return ___neigh_lookup_noref(&arp_tbl, neigh_key_eq32, arp_hashfn, &key, dev); | |
28 | } | |
29 | #else | |
30 | static inline | |
31 | struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key) | |
32 | { | |
33 | return NULL; | |
34 | } | |
35 | #endif | |
36 | ||
37 | static 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); | |
43 | if (n && !refcount_inc_not_zero(&n->refcnt)) | |
44 | n = NULL; | |
45 | rcu_read_unlock_bh(); | |
46 | ||
47 | return n; | |
48 | } | |
49 | ||
50 | static 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 */ | |
60 | if (n->confirmed != now) | |
61 | n->confirmed = now; | |
62 | } | |
63 | rcu_read_unlock_bh(); | |
64 | } | |
65 | ||
66 | void arp_init(void); | |
67 | int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg); | |
68 | void 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); | |
72 | int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir); | |
73 | void arp_ifdown(struct net_device *dev); | |
74 | ||
75 | struct 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); | |
80 | void arp_xmit(struct sk_buff *skb); | |
81 | ||
82 | #endif /* _ARP_H */ |