#!/bin/sh

. /lib/functions/tunneldigger.sh

TUNNEL_ID="$1"
INTERFACE="$3"
OLD_MTU="$4"
NEW_MTU="$5"

# Get the bridge interface name for the old and new MTUs.
tunneldigger_get_bridge old_bridge "${OLD_MTU}"
tunneldigger_get_bridge new_bridge "${NEW_MTU}"

if [ -z "$old_bridge" ]; then
  echo "Unable to determine which bridge to use for MTU ${OLD_MTU}."
  exit 1
fi

if [ -z "$new_bridge" ]; then
  echo "Unable to determine which bridge to use for MTU ${NEW_MTU}."
  exit 1
fi

# Get the isolation option for this bridge
tunneldigger_get_bridge_isolate isolate "${NEW_MTU}"

# Remove interface from old bridge.
ip link set dev ${INTERFACE} nomaster
ip link set dev ${old_bridge} mtu ${OLD_MTU}

# Change interface bridge and MTU.
ip link set dev ${INTERFACE} master ${new_bridge} mtu ${NEW_MTU}
echo $isolate > /sys/class/net/${INTERFACE}/brport/isolated
ip link set dev ${new_bridge} mtu ${NEW_MTU}