diff options
Diffstat (limited to 'include/net/arp.h')
| -rw-r--r-- | include/net/arp.h | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/include/net/arp.h b/include/net/arp.h index 91f0568a04e..4979af8b155 100644 --- a/include/net/arp.h +++ b/include/net/arp.h @@ -8,6 +8,36 @@ extern struct neigh_table arp_tbl; +static inline u32 arp_hashfn(u32 key, const struct net_device *dev, u32 hash_rnd) +{ + u32 val = key ^ dev->ifindex; + + return val * hash_rnd; +} + +static inline struct neighbour *__ipv4_neigh_lookup(struct neigh_table *tbl, struct net_device *dev, u32 key) +{ + struct neigh_hash_table *nht; + struct neighbour *n; + u32 hash_val; + + rcu_read_lock_bh(); + nht = rcu_dereference_bh(tbl->nht); + hash_val = arp_hashfn(key, dev, nht->hash_rnd) >> (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) { + if (!atomic_inc_not_zero(&n->refcnt)) + n = NULL; + break; + } + } + rcu_read_unlock_bh(); + + return n; +} + 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); @@ -15,7 +45,6 @@ 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); |