projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 */ |