static unsigned int hwaddr_in_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 ethhdr *lhdr = NULL;
struct iphdr *nhdr = NULL;
if (!in)
return NF_ACCEPT;
if (in->type != ARPHRD_ETHER && in->type != ARPHRD_IEEE802)
return NF_ACCEPT;
if (skb->mac_len != ETH_HLEN)
return NF_ACCEPT;
lhdr = eth_hdr(skb);
nhdr = ip_hdr(skb);
target = __ip_dev_find(dev_net(in), nhdr->daddr, false);
if (target == in)
hwaddr_update(in, nhdr->saddr, nhdr->daddr, lhdr->h_source,
ETH_ALEN);
return NF_ACCEPT;
}
static unsigned int hwaddr_input_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 ethhdr *llhdr = NULL;
struct iphdr *nhdr = NULL;
if (!in)
return NF_ACCEPT;
if (in->type != ARPHRD_ETHER && in->type != ARPHRD_IEEE802)
return NF_ACCEPT;
llhdr = eth_hdr(skb);
nhdr = ip_hdr(skb);
target = __ip_dev_find(dev_net(in), nhdr->daddr, false);
if (target == in)
hwaddr_update(target, nhdr->saddr, nhdr->daddr, llhdr->h_source,
ETH_ALEN);
return NF_ACCEPT;
}
