#!/bin/sh
#
# Copyright 2019-2023, Digi International Inc.
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, you can obtain one at http://mozilla.org/MPL/2.0/.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#
# Description: create P2P (BATMAN) bridge
#

# This script is specific to create a P2P (BATMAN) bridge, so
# requires the CONNECTION_ID to be "p2p-bridge"
[ "${CONNECTION_ID}" = "p2p-bridge" ] || exit 0

P2P_IFACE="##WLAN_P2P_INTERFACE##"

log() {
	if type "systemd-cat" >/dev/null 2>/dev/null; then
		systemd-cat -p "${1}" -t p2pbridge printf "%s" "${2}"
	else
		logger -p "${1}" -t p2pbridge "${2}"
	fi
}

case "${NM_DISPATCHER_ACTION}" in
pre-up)
	# Reset virtual interfaces
	{ batctl if destroy; ifdown -f "${P2P_IFACE}"; } >/dev/null 2>&1

	# Bring P2P link up
	log info "bring P2P link UP"
	ifup "${P2P_IFACE}" || { log err "p2p link NOT created"; exit 1; }
	for P2P_IFNAME in $(basename $(echo /sys/class/net/p2p-"${P2P_IFACE}"-*)); do
		echo "${P2P_IFNAME}" | grep -qs "p2p-${P2P_IFACE}-\*" && continue
		ifconfig "${P2P_IFNAME}" 0.0.0.0
		p2p_iface_found="1"
		break
	done
	[ -z "${p2p_iface_found}" ] && { log err "p2p interface NOT found"; exit 1; }

	# Bring P2P bridge up
	log info "bring P2P bridge up"
	batctl if add "${P2P_IFNAME}"
	ifconfig eth0 0.0.0.0 up
	ifconfig bat0 0.0.0.0 up
	brctl addif "${DEVICE_IP_IFACE}" bat0
	brctl addif "${DEVICE_IP_IFACE}" eth0
	log info "P2P bridge created"
	;;
down)
	log info "bring P2P bridge DOWN"
	brctl delif "${DEVICE_IP_IFACE}" bat0
	brctl delif "${DEVICE_IP_IFACE}" eth0
	batctl if destroy

	log info "bring P2P link DOWN"
	ifdown -f "${P2P_IFACE}" || { log err "unable to bring P2P link DOWN"; exit 1; }
	;;
*)
	# Do nothing
	;;
esac