#!/sbin/openrc-run
# Copyright 1999-2020 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

extra_commands="save panic"
extra_started_commands="reload"

ebtables_bin="/sbin/ebtables"
ebtables_save=${EBTABLES_SAVE}

depend() {
	before net
	use logger
}

ebtables_tables() {
	for table in filter nat broute; do
		if ${ebtables_bin} -t ${table} -L > /dev/null 2>&1; then
			printf '%s' "${table} "
		fi
	done
}

set_table_policy() {
	local chains table=$1 policy=$2
	case ${table} in
		nat)    chains="PREROUTING POSTROUTING OUTPUT";;
		broute) chains="BROUTING";;
		filter) chains="INPUT FORWARD OUTPUT";;
		*)      chains="";;
	esac
	local chain
	for chain in ${chains} ; do
		${ebtables_bin} -t ${table} -P ${chain} ${policy}
	done
}

checkconfig() {
	if [ ! -f ${ebtables_save} ] ; then
		eerror "Not starting ebtables.  First create some rules then run:"
		eerror "/etc/init.d/ebtables save"
		return 1
	fi
	return 0
}

start() {
	checkconfig || return 1
	ebegin "Loading ebtables state and starting bridge firewall"
	${ebtables_bin}-restore ${SAVE_RESTORE_OPTIONS} < "${ebtables_save}"
	eend $?
}

stop() {
	if [ "${SAVE_ON_STOP}" = "yes" ] ; then
		save || return 1
	fi
	ebegin "Stopping bridge firewall"
	local a
	for a in $(ebtables_tables); do
		set_table_policy $a ACCEPT

		${ebtables_bin} -t $a -F
		${ebtables_bin} -t $a -X
	done
	eend $?
}

reload() {
	ebegin "Flushing bridge firewall"
	local a
	for a in $(ebtables_tables); do
		${ebtables_bin} -t $a -F
		${ebtables_bin} -t $a -X
	done
	eend $?

	start
}

save() {
	ebegin "Saving ebtables state"
	touch "${ebtables_save}"
	chmod 0600 "${ebtables_save}"
	${ebtables_bin}-save $(ebtables_tables) ${SAVE_RESTORE_OPTIONS} > "${ebtables_save}"
	eend $?
}

panic() {
	service_started ebtables && svc_stop

	local a
	ebegin "Dropping all packets forwarded on bridges"
	for a in $(ebtables_tables); do
		${ebtables_bin} -t $a -F
		${ebtables_bin} -t $a -X

		set_table_policy $a DROP
	done
	eend $?
}