/usr/src/xtables-addons-1.40/xt_geoip.Kconfig is in xtables-addons-dkms 1.40-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 | config NETFILTER_XT_MATCH_GEOIP
	tristate '"geoip" match support'
	depends on NETFILTER_XTABLES
	---help---
	This option allows you to match a packet by its source or destination
	country. Basically, you need a country's database containing all
	subnets and associated countries.
	For the complete procedure and understanding, read:
	http://people.netfilter.org/acidfu/geoip/howto/geoip-HOWTO.html
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