Psyspy rambo <psyspy2020@xxxxxxxxx> wrote: > > > udp_header = (struct udphdr *)skb_transport_header(skb); > > > sip = (unsigned int)ntohl(ip_header->saddr); > > > dip = (unsigned int)ntohl(ip_header->daddr); This doesn't work reliably in netfilter hooks. See skb_header_pointer() usage in other nf modules.