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(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(tbl: &arp_tbl, key_eq: neigh_key_eq32, hash: arp_hashfn, pkey: &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(); |
42 | n = __ipv4_neigh_lookup_noref(dev, key); |
43 | if (n && !refcount_inc_not_zero(r: &n->refcnt)) |
44 | n = NULL; |
45 | rcu_read_unlock(); |
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(); |
55 | n = __ipv4_neigh_lookup_noref(dev, key); |
56 | neigh_confirm(n); |
57 | rcu_read_unlock(); |
58 | } |
59 | |
60 | void arp_init(void); |
61 | int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg); |
62 | void arp_send(int type, int ptype, __be32 dest_ip, |
63 | struct net_device *dev, __be32 src_ip, |
64 | const unsigned char *dest_hw, |
65 | const unsigned char *src_hw, const unsigned char *th); |
66 | int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir); |
67 | void arp_ifdown(struct net_device *dev); |
68 | int arp_invalidate(struct net_device *dev, __be32 ip, bool force); |
69 | |
70 | struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip, |
71 | struct net_device *dev, __be32 src_ip, |
72 | const unsigned char *dest_hw, |
73 | const unsigned char *src_hw, |
74 | const unsigned char *target_hw); |
75 | void arp_xmit(struct sk_buff *skb); |
76 | |
77 | #endif /* _ARP_H */ |
78 | |