Hi, I wrote an LKM and I am trying to get UDP port information from the first fragmented packet received in PRE_ROUTING hook as follows struct iphdr *iph = (struct iphdr*) skb_network_header(skb); struct udphdr *udph = (struct udphdr *)(iph + (iph->ihl)*4); //or (struct udphdr *)(skb->data + (iph->ihl)*4) and other such methods However ntohs(udph->source) is always returning 0. This method works for a non-fragmented packet. I am wondering if PRE_ROUTING is a good place to do this at all or LOCAL_IN is the correct place. Or is it that i am trying to fetch the payload from the wrong data pointers? I am using 2.6.35 kernel Thanks Vivek -- To unsubscribe from this list: send the line "unsubscribe netfilter" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
