gluon/package/gluon-mesh-batman-adv-core/luasrc/lib/gluon/mesh-batman-adv-core/config_mesh_interface

#!/usr/bin/lua

local util = require 'gluon.util'
local fs = require 'nixio.fs'


local ifname = os.getenv('IFNAME')
local cmd = arg[1]


if cmd == 'setup' then

	local fixed_mtu = tonumber(os.getenv('FIXED_MTU')) or 0
	local transitive = tonumber(os.getenv('TRANSITIVE')) or 0

	local mtu = tonumber(arg[2])

	if os.execute('ip link show primary0 >/dev/null 2>&1') ~= 0 then
		os.execute([[
			ip link add primary0 type dummy
			echo 1 > /proc/sys/net/ipv6/conf/primary0/disable_ipv6
			ip link set primary0 address ]] .. util.generate_mac(3) .. [[ mtu ]] .. mtu .. [[ up
			echo 'bat0' > /sys/class/net/primary0/batman_adv/mesh_iface
		]])
	end

	if fixed_mtu == 0 then
		local lower = fs.glob('/sys/class/net/' .. ifname .. '/lower_*/wireless')()
		if lower then
			lower = lower:match('/lower_([^/]+)/wireless$')
			util.exec('ip', 'link', 'set', 'dev', lower, 'mtu', tostring(mtu+4))
		end

		util.exec('ip', 'link', 'set', 'dev', ifname, 'mtu', tostring(mtu))
	end

	local file = assert(io.open('/sys/class/net/' .. ifname .. '/batman_adv/mesh_iface', 'w'))
	file:write('bat0')
	file:close()

	file = assert(io.open('/sys/class/net/' .. ifname .. '/batman_adv/no_rebroadcast', 'w'))
	file:write(tostring(transitive))
	file:close()

elseif cmd == 'teardown' then

	local file = io.open('/sys/class/net/' .. ifname .. '/batman_adv/mesh_iface', 'w')
	if file then
		file:write('none')
		file:close()
	end

	local other = false
	for lower in fs.glob('/sys/class/net/bat0/lower_*') do
		if lower ~= '/sys/class/net/bat0/lower_primary0' then
			other = true
			break
		end
	end

	if not other then
		os.execute('ip link del primary0')
	end
end