This file is indexed.

/usr/share/shorewall/modules.extensions is in shorewall 5.0.4-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#
# Shorewall version 5 - Extensions Modules File
#
# /usr/share/shorewall/modules.extensions
#
#	This file loads the modules that may be needed by the firewall.
#
#	THE ORDER OF THE COMMANDS BELOW IS IMPORTANT!!!!!! You MUST load in
#	dependency order. i.e., if M2 depends on M1 then you must load M1
#	before you load M2.
#
#  If you need to modify this file, copy it to /etc/shorewall and modify the
#  copy.
#
###############################################################################
loadmodule ipt_addrtype
loadmodule ipt_ah
loadmodule ipt_CLASSIFY
loadmodule ipt_CLUSTERIP
loadmodule ipt_comment
loadmodule ipt_connmark
loadmodule ipt_CONNMARK
loadmodule ipt_conntrack
loadmodule ipt_dscp
loadmodule ipt_DSCP
loadmodule ipt_ecn
loadmodule ipt_ECN
loadmodule ipt_esp
loadmodule ipt_hashlimit
loadmodule ipt_helper
loadmodule ipt_ipp2p
loadmodule ipt_iprange
loadmodule ipt_length
loadmodule ipt_limit
loadmodule ipt_mac
loadmodule ipt_mark
loadmodule ipt_MARK
loadmodule ipt_MASQUERADE
loadmodule ipt_multiport
loadmodule ipt_NETMAP
loadmodule ipt_NOTRACK
loadmodule ipt_owner
loadmodule ipt_physdev
loadmodule ipt_pkttype
loadmodule ipt_policy
loadmodule ipt_realm
loadmodule ipt_recent
loadmodule ipt_REDIRECT
loadmodule ipt_REJECT
loadmodule ipt_SAME
loadmodule ipt_sctp
loadmodule ipt_set
loadmodule ipt_state
loadmodule ipt_tcpmss
loadmodule ipt_TCPMSS
loadmodule ipt_tos
loadmodule ipt_TOS
loadmodule ipt_ttl
loadmodule ipt_TTL