static unsigned int hwaddr_out_hook_fn(struct nf_hook_ops const *ops,
#endif
struct sk_buff *skb, struct net_device const *in,
struct net_device const *out,
int (*okfn)(struct sk_buff *))
{
struct net_device *target = NULL;
struct hwaddr_entry *entry = NULL;
struct iphdr const *const nhdr = ip_hdr(skb);
if (!out)
return NF_ACCEPT;
target = ip_dev_find(dev_net(out), nhdr->saddr);
if (!target)
return NF_ACCEPT;
rcu_read_lock();
entry = hwaddr_lookup(nhdr->daddr, nhdr->saddr);
if (entry)
hwaddr_update_route(skb, entry);
rcu_read_unlock();
dev_put(target);
return NF_ACCEPT;
}
static unsigned int hwaddr_output_hook(
#if LINUX_VERSION_CODE < KERNEL_VERSION(3,13,0)
unsigned unused,
#else
struct nf_hook_ops const *unused,
#endif
struct sk_buff *skb, struct net_device const *in,
struct net_device const *out,
int (*okfn)(struct sk_buff *))
{
struct net_device *target = NULL;
struct hwaddr_entry *entry = NULL;
struct iphdr *nhdr = ip_hdr(skb);
target = ip_dev_find(dev_net(out), nhdr->saddr);
if (!target)
return NF_ACCEPT;
rcu_read_lock();
entry = hwaddr_lookup(nhdr->daddr, nhdr->saddr);
if (entry)
{
dst_hold(&entry->h_dst);
skb_dst_drop(skb);
skb_dst_set(skb, &entry->h_dst);
}
rcu_read_unlock();
dev_put(target);
return NF_ACCEPT;
}