#!/bin/sh
#
# Maximilian Wilhelm <max@sdn.clinic>
#  --  Thu, 17 Dec 2020 03:02:10 +0100
#
# This executor is responsible for setting up MPLS decapsulation on a given interface.
#
# See interfaces-mpls(5) for a list of supported options.
#

yesno() {
	case "$1" in
	yes|1)	echo 1 ;;
	*)	echo 0 ;;
	esac
}

[ -z "$VERBOSE" ] || set -x

# We only operate in pre-up phase
[ "$PHASE" != "pre-up" ] && exit 0


if [ "$IF_MPLS_ENABLE" ]; then
	value=$(yesno $IF_MPLS_ENABLE)

	# Load mpls module if we should enable MPLS decap on (at least) one interface
	if [ "${value}" = 1 ]; then
		${MOCK} modprobe mpls_iptunnel
	fi

	# If MPLS support isn't loaded and we are not MOCKing, carry on
	if [ -f "/proc/sys/net/mpls/conf/$IFACE/input" -o "${MOCK}" ]; then
		${MOCK} /bin/sh -c "echo ${value} > /proc/sys/net/mpls/conf/$IFACE/input"
	fi
fi