11da177e4SLinus Torvalds /* linux/net/inet/arp.h */ 21da177e4SLinus Torvalds #ifndef _ARP_H 31da177e4SLinus Torvalds #define _ARP_H 41da177e4SLinus Torvalds 51da177e4SLinus Torvalds #include <linux/if_arp.h> 61da177e4SLinus Torvalds #include <net/neighbour.h> 71da177e4SLinus Torvalds 81da177e4SLinus Torvalds 91da177e4SLinus Torvalds extern struct neigh_table arp_tbl; 101da177e4SLinus Torvalds 11f610b74bSDavid S. Miller static inline u32 arp_hashfn(u32 key, const struct net_device *dev, u32 hash_rnd) 12f610b74bSDavid S. Miller { 13f610b74bSDavid S. Miller u32 val = key ^ dev->ifindex; 14f610b74bSDavid S. Miller 15f610b74bSDavid S. Miller return val * hash_rnd; 16f610b74bSDavid S. Miller } 17f610b74bSDavid S. Miller 18*a263b309SDavid S. Miller static inline struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key) 193769cffbSDavid Miller { 20*a263b309SDavid S. Miller struct neigh_hash_table *nht = rcu_dereference_bh(arp_tbl.nht); 213769cffbSDavid Miller struct neighbour *n; 223769cffbSDavid Miller u32 hash_val; 233769cffbSDavid Miller 24*a263b309SDavid S. Miller if (dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) 25*a263b309SDavid S. Miller key = 0; 26*a263b309SDavid S. Miller 272c2aba6cSDavid S. Miller hash_val = arp_hashfn(key, dev, nht->hash_rnd[0]) >> (32 - nht->hash_shift); 283769cffbSDavid Miller for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); 293769cffbSDavid Miller n != NULL; 303769cffbSDavid Miller n = rcu_dereference_bh(n->next)) { 31*a263b309SDavid S. Miller if (n->dev == dev && *(u32 *)n->primary_key == key) 32*a263b309SDavid S. Miller return n; 33*a263b309SDavid S. Miller } 34*a263b309SDavid S. Miller 35*a263b309SDavid S. Miller return NULL; 36*a263b309SDavid S. Miller } 37*a263b309SDavid S. Miller 38*a263b309SDavid S. Miller static inline struct neighbour *__ipv4_neigh_lookup(struct net_device *dev, u32 key) 39*a263b309SDavid S. Miller { 40*a263b309SDavid S. Miller struct neighbour *n; 41*a263b309SDavid S. Miller 42*a263b309SDavid S. Miller rcu_read_lock_bh(); 43*a263b309SDavid S. Miller n = __ipv4_neigh_lookup_noref(dev, key); 44*a263b309SDavid S. Miller if (n && !atomic_inc_not_zero(&n->refcnt)) 453769cffbSDavid Miller n = NULL; 463769cffbSDavid Miller rcu_read_unlock_bh(); 473769cffbSDavid Miller 483769cffbSDavid Miller return n; 493769cffbSDavid Miller } 503769cffbSDavid Miller 511da177e4SLinus Torvalds extern void arp_init(void); 521da177e4SLinus Torvalds extern int arp_find(unsigned char *haddr, struct sk_buff *skb); 5332e569b7SPavel Emelyanov extern int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg); 54ed9bad06SAl Viro extern void arp_send(int type, int ptype, __be32 dest_ip, 55ed9bad06SAl Viro struct net_device *dev, __be32 src_ip, 56abfdf1c4SJan Engelhardt const unsigned char *dest_hw, 57abfdf1c4SJan Engelhardt const unsigned char *src_hw, const unsigned char *th); 58714e85beSAl Viro extern int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir); 591da177e4SLinus Torvalds extern void arp_ifdown(struct net_device *dev); 601da177e4SLinus Torvalds 61ed9bad06SAl Viro extern struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip, 62ed9bad06SAl Viro struct net_device *dev, __be32 src_ip, 63abfdf1c4SJan Engelhardt const unsigned char *dest_hw, 64abfdf1c4SJan Engelhardt const unsigned char *src_hw, 65abfdf1c4SJan Engelhardt const unsigned char *target_hw); 661da177e4SLinus Torvalds extern void arp_xmit(struct sk_buff *skb); 67545ecdc3SMaxim Levitsky int arp_invalidate(struct net_device *dev, __be32 ip); 681da177e4SLinus Torvalds 691da177e4SLinus Torvalds #endif /* _ARP_H */ 70