projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* linux/net/inet/arp.h */ |
| 2 | #ifndef _ARP_H | |
| 3 | #define _ARP_H | |
| 4 | ||
| 5 | #include <linux/if_arp.h> | |
| 6 | #include <net/neighbour.h> | |
| 7 | ||
| 1da177e4 LT |
8 | |
| 9 | extern struct neigh_table arp_tbl; | |
| 10 | ||
| f610b74b DM |
11 | static inline u32 arp_hashfn(u32 key, const struct net_device *dev, u32 hash_rnd) |
| 12 | { | |
| 13 | u32 val = key ^ dev->ifindex; | |
| 14 | ||
| 15 | return val * hash_rnd; | |
| 16 | } | |
| 17 | ||
| a263b309 | 18 | static inline struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key) |
| 3769cffb | 19 | { |
| a263b309 | 20 | struct neigh_hash_table *nht = rcu_dereference_bh(arp_tbl.nht); |
| 3769cffb DM |
21 | struct neighbour *n; |
| 22 | u32 hash_val; | |
| 23 | ||
| 2c2aba6c | 24 | hash_val = arp_hashfn(key, dev, nht->hash_rnd[0]) >> (32 - nht->hash_shift); |
| 3769cffb DM |
25 | for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); |
| 26 | n != NULL; | |
| 27 | n = rcu_dereference_bh(n->next)) { | |
| a263b309 DM |
28 | if (n->dev == dev && *(u32 *)n->primary_key == key) |
| 29 | return n; | |
| 3769cffb | 30 | } |
| a263b309 DM |
31 | |
| 32 | return NULL; | |
| 33 | } | |
| 34 | ||
| 35 | static inline struct neighbour *__ipv4_neigh_lookup(struct net_device *dev, u32 key) | |
| 36 | { | |
| 37 | struct neighbour *n; | |
| 38 | ||
| 39 | rcu_read_lock_bh(); | |
| 40 | n = __ipv4_neigh_lookup_noref(dev, key); | |
| 41 | if (n && !atomic_inc_not_zero(&n->refcnt)) | |
| 42 | n = NULL; | |
| 3769cffb DM |
43 | rcu_read_unlock_bh(); |
| 44 | ||
| 45 | return n; | |
| 46 | } | |
| 47 | ||
| 1da177e4 | 48 | extern void arp_init(void); |
| 1da177e4 | 49 | extern int arp_find(unsigned char *haddr, struct sk_buff *skb); |
| 32e569b7 | 50 | extern int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg); |
| ed9bad06 AV |
51 | extern void arp_send(int type, int ptype, __be32 dest_ip, |
| 52 | struct net_device *dev, __be32 src_ip, | |
| abfdf1c4 JE |
53 | const unsigned char *dest_hw, |
| 54 | const unsigned char *src_hw, const unsigned char *th); | |
| 714e85be | 55 | extern int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir); |
| 1da177e4 LT |
56 | extern void arp_ifdown(struct net_device *dev); |
| 57 | ||
| ed9bad06 AV |
58 | extern struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip, |
| 59 | struct net_device *dev, __be32 src_ip, | |
| abfdf1c4 JE |
60 | const unsigned char *dest_hw, |
| 61 | const unsigned char *src_hw, | |
| 62 | const unsigned char *target_hw); | |
| 1da177e4 | 63 | extern void arp_xmit(struct sk_buff *skb); |
| 545ecdc3 | 64 | int arp_invalidate(struct net_device *dev, __be32 ip); |
| 1da177e4 | 65 | |
| 1da177e4 | 66 | #endif /* _ARP_H */ |