| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 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 | |
| 8 | |
| 9 | extern struct neigh_table arp_tbl; |
| 10 | |
| 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 | |
| 18 | static inline struct neighbour *__ipv4_neigh_lookup(struct net_device *dev, u32 key) |
| 19 | { |
| 20 | struct neigh_hash_table *nht; |
| 21 | struct neighbour *n; |
| 22 | u32 hash_val; |
| 23 | |
| 24 | rcu_read_lock_bh(); |
| 25 | nht = rcu_dereference_bh(arp_tbl.nht); |
| 26 | hash_val = arp_hashfn(key, dev, nht->hash_rnd[0]) >> (32 - nht->hash_shift); |
| 27 | for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); |
| 28 | n != NULL; |
| 29 | n = rcu_dereference_bh(n->next)) { |
| 30 | if (n->dev == dev && *(u32 *)n->primary_key == key) { |
| 31 | if (!atomic_inc_not_zero(&n->refcnt)) |
| 32 | n = NULL; |
| 33 | break; |
| 34 | } |
| 35 | } |
| 36 | rcu_read_unlock_bh(); |
| 37 | |
| 38 | return n; |
| 39 | } |
| 40 | |
| 41 | extern void arp_init(void); |
| 42 | extern int arp_find(unsigned char *haddr, struct sk_buff *skb); |
| 43 | extern int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg); |
| 44 | extern void arp_send(int type, int ptype, __be32 dest_ip, |
| 45 | struct net_device *dev, __be32 src_ip, |
| 46 | const unsigned char *dest_hw, |
| 47 | const unsigned char *src_hw, const unsigned char *th); |
| 48 | extern int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir); |
| 49 | extern void arp_ifdown(struct net_device *dev); |
| 50 | |
| 51 | extern struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip, |
| 52 | struct net_device *dev, __be32 src_ip, |
| 53 | const unsigned char *dest_hw, |
| 54 | const unsigned char *src_hw, |
| 55 | const unsigned char *target_hw); |
| 56 | extern void arp_xmit(struct sk_buff *skb); |
| 57 | int arp_invalidate(struct net_device *dev, __be32 ip); |
| 58 | |
| 59 | #endif /* _ARP_H */ |