Add L2TP support

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

protocols/ppp/luasrc/model/cbi/admin_network/proto_l2tp.lua

@@ -0,0 +1,57 @@
+--[[
+LuCI - Lua Configuration Interface
+
+Copyright 2011 Jo-Philipp Wich <xm@subsignal.org>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+	http://www.apache.org/licenses/LICENSE-2.0
+]]--
+
+local map, section, net = ...
+
+local server, username, password
+local buffering, defaultroute, metric, peerdns, dns
+
+
+server = section:taboption("general", Value, "server", translate("L2TP Server"))
+server.datatype = "host"
+
+
+username = section:taboption("general", Value, "username", translate("PAP/CHAP username"))
+
+
+password = section:taboption("general", Value, "password", translate("PAP/CHAP password"))
+password.password = true
+
+
+defaultroute = section:taboption("advanced", Flag, "defaultroute",
+	translate("Use default gateway"),
+	translate("If unchecked, no default route is configured"))
+
+defaultroute.default = defaultroute.enabled
+
+
+metric = section:taboption("advanced", Value, "metric",
+	translate("Use gateway metric"))
+
+metric.placeholder = "0"
+metric.datatype    = "uinteger"
+metric:depends("defaultroute", defaultroute.enabled)
+
+
+peerdns = section:taboption("advanced", Flag, "peerdns",
+	translate("Use DNS servers advertised by peer"),
+	translate("If unchecked, the advertised DNS server addresses are ignored"))
+
+peerdns.default = peerdns.enabled
+
+
+dns = section:taboption("advanced", DynamicList, "dns",
+	translate("Use custom DNS servers"))
+
+dns:depends("peerdns", "")
+dns.datatype = "ipaddr"
+dns.cast     = "string"

protocols/ppp/luasrc/model/network/proto_ppp.lua

@@ -20,7 +20,7 @@ limitations under the License.
 local netmod = luci.model.network
 
 local _, p
-for _, p in ipairs({"ppp", "pptp", "pppoe", "pppoa", "3g"}) do
+for _, p in ipairs({"ppp", "pptp", "pppoe", "pppoa", "3g", "l2tp"}) do
 
 	local proto = netmod:register_protocol(p)
 
@@ -35,6 +35,8 @@ for _, p in ipairs({"ppp", "pptp", "pppoe", "pppoa", "3g"}) do
 			return luci.i18n.translate("PPPoE")
 		elseif p == "pppoa" then
 			return luci.i18n.translate("PPPoATM")
+		elseif p == "l2tp" then
+			return luci.i18n.translate("L2TP")
 		end
 	end
 
@@ -53,6 +55,8 @@ for _, p in ipairs({"ppp", "pptp", "pppoe", "pppoa", "3g"}) do
 			return "ppp-mod-pppoe"
 		elseif p == "pppoa" then
 			return "ppp-mod-pppoa"
+		elseif p == "l2tp" then
+			return "xl2tpd"
 		end
 	end