v6tun

#! /bin/bash
 
### BEGIN INIT INFO
# Provides:          ipv6
# Required-Start:    $local_fs $all
# Required-Stop:     $local_fs $network
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: starts the ipv6 tunnel 
# Description:       ipv6 tunnel start-stop-daemon
### END INIT INFO

PATH=/usr/bin:/usr/local/bin:/usr/sbin:/usr/local/sbin:/bin:/sbin
DAEMON=/usr/local/sbin/tb_userspace
NAME=v6tun

DEV_NAME=v6tun0
TUN_SINK=66.220.18.42
TUN_SOURCE=107.161.94.156
V6_ADDRS="
2001:470:c:dad::2/64
2001:470:c:dad:dead:beef:bad:cafe/64
2001:470:f548:face:dead:beef:bad:cafe/48
2001:470:f548::9/48
"
V6_PARTS="
2001:470:c:dad::/64
2001:470:d:dad::/64
2001:470:f548::/48
"
V6_ROUTES="
"
V6_GW=2001:470:c:dad::1
V6_DEFAULT=0
PID_FILE=/tmp/$NAME.pid
ROUTE_TABLE=233

if [ -r /etc/default/v6tun ]; then
	. /etc/default/v6tun
fi

test -x $DAEMON || exit 0

. /lib/init/vars.sh
. /lib/lsb/init-functions

init_device() {
	ip link set dev "$DEV_NAME" up mtu 1480 txqueuelen 256 >/dev/null 2>&1 || return 1
	return 0
}

destroy_device() {
	ip link set dev "$DEV_NAME" down >/dev/null 2>&1 || return 1
	return 0
}


add_addresses() {
	PREFERED="forever"
	for address in $V6_ADDRS; do
		ip -6 addr add "$address" dev "$DEV_NAME" scope global valid_lft forever preferred_lft "$PREFERED" >/dev/null 2>&1 || return 1
		PREFERED="0"
	done
	return 0
}

add_routes() {
	if [[ $V6_DEFAULT -ne 0 ]]; then
		ip -6 route del default >/dev/null 2>&1 || true
		ip -6 route add default via "$V6_GW" dev "$DEV_NAME" >/dev/null 2>&1 || return 1
	fi
	ip -6 route flush table $ROUTE_TABLE
	ip -6 route add default via "$V6_GW" dev "$DEV_NAME" table $ROUTE_TABLE
	for route in $V6_ROUTES; do
		ip -6 route add "$route" dev "$DEV_NAME" via "$V6_GW" >/dev/null 2>&1 || return 1
	done
	for part in $V6_PARTS; do
		ip -6 rule del from "$part" table $ROUTE_TABLE
		ip -6 rule add from "$part" table $ROUTE_TABLE
	done
	return 0;
}

flush_routes() {
	ip -6 route flush dev "$DEV_NAME" >/dev/null 2>&1 || true
	return 0
}

case "$1" in
	start)
		log_daemon_msg "Starting userspace tunnel driver" "$NAME"
		setsid "$DAEMON" v6tun0 "$TUN_SINK" "$TUN_SOURCE" sit >/dev/null 2>&1 &
		PID=$!
		echo $PID > $PID_FILE
		for i in `seq 1 5`
		do
			sleep 5
			log_end_msg 0
			log_daemon_msg "Initialize virtual device"
			if init_device; then
				log_end_msg 0
				INIT_OK=yes
				break
			fi
		done
		if [ "x$INIT_OK" != "xyes" ]
		then
			log_end_msg 1
			exit 1
		fi
		log_daemon_msg "Add assigned addresses"
		if ! add_addresses; then
			log_end_msg 1
			exit 1
		fi
		log_end_msg 0
		log_daemon_msg "Add routes"
		if ! add_routes; then
			log_end_msg 1
			exit 1
		fi
		log_end_msg 0
		;;
	stop)
		log_daemon_msg "Flushing routes"
		flush_routes
		log_end_msg 0
		log_daemon_msg "Destroying devices"
		destroy_device
		log_end_msg 0
		log_daemon_msg "Stopping userspace tunnel driver" "$NAME"
		kill `cat $PID_FILE` >/dev/null 2>&1 || true
		rm -f `cat $PID_FILE` >/dev/null 2>&1 || true
		log_end_msg 0
		;;
	*)
		echo "Usage: /etc/init.d/v6tun {start|stop}"
		exit 1
		;;
esac

exit 0