Netfilter extension to match various DNS atributes
by Ondřej Caletka, 2013
This work is based on the original xt_dns netfilter extension, written by Bartłomiej Korupczyński http://software.klolik.org/xt_dns/
This fork addes availability to match queries, or responses, to match query type (eg. ANY) in queries or even in responses and also to match packet with EDNS0 pseudo-RR and with specific bufsize range. The matching algorithm is fully RFC 1035 compliant.
Only non-fragmented UDP packets are supported, both IPv4 and IPv6.