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#!/sbin/openrc-run
# Copyright 2014 Nicholas Vinson
# Copyright 1999-2014 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
extra_commands="list panic save"
extra_started_commands="reload"
description="Manage nftable based firewall."
description_save="Save current nftables rulesets to disk."
description_list="Displays the current nftables ruleset."
description_panic="Immediately drop all packets on all interfaces."
description_reload="Clear current rulesets and load rulesets from the saved ruleset files."
depend() {
need localmount #434774
before net
}
start_pre() {
checkkernel || return 1
checkconfig || return 1
return 0
}
clear() {
nft flush ruleset || return 1
return 0
}
list() {
nft list ruleset || return 1
return 0
}
panic() {
checkkernel || return 1
if service_started ${RC_SVCNAME}; then
rc-service ${RC_SVCNAME} stop
fi
ebegin "Dropping all packets"
clear
if nft create table ip filter >/dev/null 2>&1; then
nft -f /dev/stdin <<-EOF
table ip filter {
chain input {
type filter hook input priority 0;
drop
}
chain forward {
type filter hook forward priority 0;
drop
}
chain output {
type filter hook output priority 0;
drop
}
}
EOF
fi
if nft create table ip6 filter >/dev/null 2>&1; then
nft -f /dev/stdin <<-EOF
table ip6 filter {
chain input {
type filter hook input priority 0;
drop
}
chain forward {
type filter hook forward priority 0;
drop
}
chain output {
type filter hook output priority 0;
drop
}
}
EOF
fi
}
reload() {
start
}
save() {
ebegin "Saving nftables state"
checkpath -q -d "$(dirname "${NFTABLES_SAVE}")"
checkpath -q -m 0600 -f "${NFTABLES_SAVE}"
local tmp_save="${NFTABLES_SAVE}.tmp"
nft list ruleset > ${tmp_save}
retval=$?
if [ ${retval} ]; then
mv ${tmp_save} ${NFTABLES_SAVE}
fi
return $?
}
start() {
clear
ebegin "Loading nftables state and starting firewall"
nft -f ${NFTABLES_SAVE}
eend $?
}
stop() {
if yesno ${SAVE_ON_STOP:-yes}; then
save || return 1
fi
ebegin "Stopping firewall"
clear
eend $?
}
checkconfig() {
if [ ! -f ${NFTABLES_SAVE} ]; then
eerror "Not starting nftables. First create some rules then run:"
eerror "rc-service nftables save"
return 1
fi
return 0
}
checkkernel() {
if ! nft list tables >/dev/null 2>&1; then
eerror "Your kernel lacks nftables support, please load"
eerror "appropriate modules and try again."
return 1
fi
return 0
}
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