# SPDX-License-Identifier: GPL-3.0-only
#
# Copyright 2017 Adrian Schmutzler

ipMacSuffix() {
	# Returns the lower 64 bits of an IPv6 address (0:aabb:ccdd:eeff)
	# based on the provided MAC address (aa:bb:cc:bb:ee:ff)
	#
	# Argument: MAC address (with colons)

	[ $# -ne "1" ] && return 1

	local mac=$1

	echo "$mac" | awk -F: '{ print "0:"$1$2":"$3$4":"$5$6 }'
	return 0
}

ipEUISuffix() {
	# Returns the EUI (interface ID, a8bb:ccff:fedd:eeff)
	# based on the provided MAC address (aa:bb:cc:bb:ee:ff)
	#
	# Argument: MAC address (with colons)

	[ $# -ne "1" ] && return 1

	local mac=$1

	echo "$mac" | awk -F: '{ printf("%02x%s:%sff:fe%s:%s%s\n", xor(("0x"$1),2), $2, $3, $4, $5, $6) }'
	return 0
}

macFlipLocalBit() {
	# Returns given MAC-address with locally administered bit flipped
	#
	# Argument: MAC-address

	local mac=$1

	echo "$mac" | awk -F: '{ printf("%02x:%s:%s:%s:%s:%s\n", xor(("0x"$1),2), $2, $3, $4, $5, $6) }'
	return 0
}