diff options
Diffstat (limited to 'include/net/arp.h')
| -rw-r--r-- | include/net/arp.h | 71 |
1 files changed, 54 insertions, 17 deletions
diff --git a/include/net/arp.h b/include/net/arp.h index f4cf6ce6658..73c49864076 100644 --- a/include/net/arp.h +++ b/include/net/arp.h @@ -3,27 +3,64 @@ #define _ARP_H #include <linux/if_arp.h> +#include <linux/hash.h> #include <net/neighbour.h> extern struct neigh_table arp_tbl; -extern void arp_init(void); -extern int arp_find(unsigned char *haddr, struct sk_buff *skb); -extern int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg); -extern void arp_send(int type, int ptype, __be32 dest_ip, - struct net_device *dev, __be32 src_ip, - const unsigned char *dest_hw, - const unsigned char *src_hw, const unsigned char *th); -extern int arp_bind_neighbour(struct dst_entry *dst); -extern int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir); -extern void arp_ifdown(struct net_device *dev); - -extern struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip, - struct net_device *dev, __be32 src_ip, - const unsigned char *dest_hw, - const unsigned char *src_hw, - const unsigned char *target_hw); -extern void arp_xmit(struct sk_buff *skb); +static inline u32 arp_hashfn(u32 key, const struct net_device *dev, u32 hash_rnd) +{ + u32 val = key ^ hash32_ptr(dev); + + return val * hash_rnd; +} + +static inline struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key) +{ + struct neigh_hash_table *nht = rcu_dereference_bh(arp_tbl.nht); + struct neighbour *n; + u32 hash_val; + + hash_val = arp_hashfn(key, dev, nht->hash_rnd[0]) >> (32 - nht->hash_shift); + for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); + n != NULL; + n = rcu_dereference_bh(n->next)) { + if (n->dev == dev && *(u32 *)n->primary_key == key) + return n; + } + + return NULL; +} + +static inline struct neighbour *__ipv4_neigh_lookup(struct net_device *dev, u32 key) +{ + struct neighbour *n; + + rcu_read_lock_bh(); + n = __ipv4_neigh_lookup_noref(dev, key); + if (n && !atomic_inc_not_zero(&n->refcnt)) + n = NULL; + rcu_read_unlock_bh(); + + return n; +} + +void arp_init(void); +int arp_find(unsigned char *haddr, struct sk_buff *skb); +int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg); +void arp_send(int type, int ptype, __be32 dest_ip, + struct net_device *dev, __be32 src_ip, + const unsigned char *dest_hw, + const unsigned char *src_hw, const unsigned char *th); +int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir); +void arp_ifdown(struct net_device *dev); + +struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip, + struct net_device *dev, __be32 src_ip, + const unsigned char *dest_hw, + const unsigned char *src_hw, + const unsigned char *target_hw); +void arp_xmit(struct sk_buff *skb); #endif /* _ARP_H */ |