struct iphdr *iph = skb->nh.iph;
struct tcphdr *th = (struct tcphdr*)(skb->nh.raw + (iph->ihl * 4));
unsigned int doffset = (iph->ihl + th->doff) * 4;
struct iphdr *iph = skb->nh.iph;
struct tcphdr *th = (struct tcphdr*)(skb->nh.raw + (iph->ihl * 4));
unsigned int doffset = (iph->ihl + th->doff) * 4;