/usr/src/xtables-addons-1.40/xt_ipv4options.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 | config NETFILTER_XT_MATCH_IPV4OPTIONS
tristate '"ipv4options" IPv4 option match support'
depends on NETFILTER_XTABLES
---help---
The ipv4options match can be used to check on the presence or absence
of one or move IPv4 options.
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