#!/bin/sh

[ -z "$IF_RT" ] && exit 0
[ -z "$IF_RT_GW" ] && exit 0

if [ "$MODE" = "start" ]; then
	grep -qEi "$IF_RT[ 	]*$IFACE" /etc/iproute2/rt_tables \
		|| echo -e "$IF_RT\t$IFACE" >> /etc/iproute2/rt_tables
	
	ip route show table $IF_RT | grep -qEi "default via $IF_RT_GW" \
		|| ip route add default via $IF_RT_GW table $IF_RT
	
	for fwmark in $IF_RT_FWMARK; do
		ip rule show | grep -qEi "from all fwmark $fwmark lookup $IFACE" \
			|| ip rule add from all fwmark $fwmark lookup $IFACE

		if ! iptables -L -n -t mangle | grep 'CONNMARK.*'$IFACE'.*'$IF_ADDRESS'.*state NEW CONNMARK xset.*'$IF_RT_FWMARK'/'; then
			iptables -t mangle -A PREROUTING -i $IFACE -d $IF_ADDRESS -m state --state NEW -j CONNMARK --set-mark $IF_RT_FWMARK
		fi

		if ! iptables -L -n -t mangle | grep 'CONNMARK.*eth+.*CONNMARK restore'; then
			iptables -t mangle -A PREROUTING -i eth+ -j CONNMARK --restore-mark
		fi
	done

	for addr in $IF_ADDRESS $IF_RT_OA; do
		ip rule show | grep -qEi "from $addr lookup $IFACE" \
			|| ip rule add from $addr table $IF_RT
	done

	if [ ! -z "$IF_RT_IMPORTGLOBAL" ]; then
		ip route show \
		| sed -e 's/$/ table '$IF_RT'/g' -e 's/^/ip route add /g' \
		| sh 2>&1 || true
	fi

	
elif [ "$MODE" = "stop" ]; then

	for addr in $IF_ADDRESS $IF_RT_OA; do
		ip rule show | grep -qEi "from $addr lookup $IFACE" \
			&& ip rule del from $addr lookup $IFACE
	done

	for fwmark in $IF_RT_FWMARK; do
		ip rule show | grep -qEi "from all fwmark $fwmark lookup $IFACE" \
			|| ip rule del from all fwmark $fwmark lookup $IFACE

		if iptables -L -n -t mangle | grep 'CONNMARK.*'$IFACE'.*'$IF_ADDRESS'.*state NEW CONNMARK xset.*'$IF_RT_FWMARK'/'; then
			iptables -t mangle -D PREROUTING -i $IFACE -d $IF_ADDRESS -m state --state NEW -j CONNMARK --set-mark $IF_RT_FWMARK
		fi


	done


	ip route show table $IF_RT | grep -qEi "default via $IF_RT_GW" \
		&& ip route del default via $IF_RT_GW table $IF_RT

	grep -v "$IF_RT[ 	]*$IFACE" /etc/iproute2/rt_tables \
		> /etc/iproute2/rt_tables.tmp
	mv  /etc/iproute2/rt_tables.tmp /etc/iproute2/rt_tables
fi