gluon-brmldproxy-router-check

#!/bin/sh

lookup_site() {
	local path="$1" default="$2"
	lua -e "print(require('gluon.site').$path('$default'))"
}

lookup_prefix6() {
	local prefix

	prefix="$(lookup_site 'prefix6')"
	echo "${prefix%/*}"
}

lookup_prefix6_len() {
	local prefix

	prefix="$(lookup_site 'prefix6')"
	echo "${prefix#*/}"
}

# Generates and prints an RFC3306, section 4 style network prefix based
# multicast address from the site prefix6 with a pseudo-random group-id
# from the domain seed.
get_gluon_all_mc_routers_ip6() {
	local prefix6 prefix6_len group_id

	prefix6="$(lookup_prefix6)"
	prefix6_len="$(lookup_prefix6_len)"
	group_id="$(lua -e 'print(require("gluon.util").domain_seed_bytes("gluon-mesh-batman-adv-brmldproxy.gluon-all-mc-routers-group", 4))')"
	group_id="$(echo "${group_id}" | sed 's/\(....\)/\1:/g;s/:$//')"

	echo "ff32:$(printf "%x" "${prefix6_len}"):${prefix6}${group_id}"
}

update_router_recv() {
	local action="$1"
	local mc_ip6

	mc_ip6="$(get_gluon_all_mc_routers_ip6)"
	bridge mdb "$action" dev br-client port local-port grp "${mc_ip6}" permanent 2> /dev/null
}

if [ "$(batctl mj | jsonfilter -e "@.mcast_flags.want_no_rtr_ipv6")" = "false" ]; then
	update_router_recv add
	echo 1 > /sys/class/net/brmldpb0/bridge/multicast_querier
else
	update_router_recv del
	echo 0 > /sys/class/net/brmldpb0/bridge/multicast_querier
fi