Dump maxmind DB for linux iptables xt_geoip

The program is designed to convert the GeoLite2-Country.mmdb file into a dataset for xtables-addons/xt_geoip.

It is also possible to get files GeoLite2-Country-Blocks-IPv4.csv, GeoLite2-Country-Blocks-IPv6.csv, GeoLite2-Country-Locations-en.csv