vxmon.sh

#!/bin/sh

DEV=${1:-vxlan0}

handle_add() {
	mac="${1:?}"
	dev="${2:?}"
	dst="${3:?}"

	echo "bridge fdb append 00:00:00:00:00:00 dst $dst dev $dev"
	bridge fdb append 00:00:00:00:00:00 dst "$dst" dev "$dev"
}

handle_cleanup() {
	mac="${1:?}"
	dev="${2:?}"
	dst="${3:?}"

	if ! bridge fdb show dev "$dev" | grep -v 00:00:00:00:00:00 | grep "$dst"; then
		bridge fdb del 00:00:00:00:00:00 dst "$dst" dev "$dev"
	fi
}

handle_entry() {
	cmd=handle_add

	if [ "$1" = "Deleted" ]; then
		shift
		cmd=handle_cleanup
	fi

	mac="${1:?}"
	dev="${3:?}"

	if [ "$dev" != "$DEV" ]; then
		return
	fi

	if [ "$mac" = "00:00:00:00:00:00" ]; then
		echo "skipping" "$@"
		return
	fi

	$cmd "$mac" "$3" "$5"
}

main() {
	bridge monitor fdb | while read args; do
		handle_entry $args
	done
}

main