#!/bin/sh
#
# Load the multipath config
#
# Author: Mario Krueger <openwrt at xedp3x.de>
# Released under GPL 3 or later

[ "$ACTION" = ifup -o "$ACTION" = ifupdate ] || exit 0

enable=`uci -q get network.globals.multipath` || exit 0
[ "$enable" = "enable" ] || exit 0

. /lib/functions.sh
. /lib/functions/network.sh

id=0
count=1

set_default() {
    local mode
    local config="$1"
    count=$(($count+1))
    local iface
    config_get iface "$config" ifname
    [ "$iface" = "$INTERFACE" ] && id=$count
    config_get mode "$config" multipath
    [ "$mode" = "master" ] && {
        local gateway
        network_get_gateway gateway $config || {
                logger -t multipath master device $DEVICE has no gateway!
                #Fallback: use upcomming interface...
		network_get_gateway gateway $INTERFACE
		config=$INTERFACE
        }
        local iface
        config_get iface "$config" ifname
        [ -n "gateway" ] && {
		ip route replace default via $gateway dev $iface || {
			#Fallback: use upcomming interface...
			network_get_gateway gateway $INTERFACE
			ip route replace default via $gateway dev $INTERFACE
			logger -t multipath Failed to set default multipath device! Use $INTERFACE as fallback...
		}
	}
    }
}

config_load network
config_foreach set_default interface
[ $id = 0 ] && {
        logger -t multipath device $INTERFACE not found!
        echo device $INTERFACE not found!
        exit 1
}

mode=`uci -q get network.$INTERFACE.multipath` || mode='off'
[ -n "$(ifconfig | grep $DEVICE)" ] || exit 0

case "$mode" in
  "off")
        multipath $DEVICE off
        exit 0;;
  "master")
        mode="on";;
  "on");;
  "backup");;
  "handover");;
  *)
        logger -t multipath Wrong multipath value for device $DEVICE
        exit 1;;
esac

# Update kernel flags
multipath $DEVICE $mode

# IPv4 Updates:

network_get_ipaddr  ipaddr  $INTERFACE
network_get_gateway gateway $INTERFACE
network_get_subnet  network $INTERFACE
__network_ifstatus  netmask $INTERFACE "['ipv4-address'][0]['mask']"
network=`ipcalc.sh $network | sed -n '/NETWORK=/{;s/.*=//;s/ .*//;p;}'`

ip rule del table $id
ip route flush $id
ip rule add from $ipaddr table $id
ip route add $network/$netmask dev $DEVICE scope link table $id
ip route add default via $gateway dev $DEVICE table $id
ip route flush $id