Don't fail if we do not have v6 support

libs/sys/luasrc/sys.lua

@@ -320,7 +320,11 @@ end
 --			  "flags", "device" }
 function net.defaultroute6()
 	local route = nil
-	for _, r in pairs(net.routes6()) do
+	local routes6 = net.routes6()
+	if not routes6 then
+		return nil
+	end
+	for _, r in pairs(routes6) do
 		if r.dest:prefix() == 0 and (not route or route.metric > r.metric) then
 			route = r
 		end
@@ -417,6 +421,10 @@ end
 function net.routes6()
 	local routes = { }
 
+	if not luci.fs.access("/proc/net/ipv6_route", "r") then
+		return nil
+	end
+
 	for line in io.lines("/proc/net/ipv6_route") do
 
 		local dst_ip, dst_prefix, src_ip, src_prefix, nexthop,

modules/admin-full/luasrc/model/cbi/admin_network/routes.lua

@@ -14,6 +14,8 @@ $Id$
 require("luci.tools.webadmin")
 m = Map("network", translate("a_n_routes"), translate("a_n_routes1"))
 
+local routes6 = luci.sys.net.routes6()
+
 if not arg or not arg[1] then
 	local routes = luci.sys.net.routes()
 
@@ -42,31 +44,30 @@ if not arg or not arg[1] then
 
 	metric = v:option(DummyValue, "Metric", translate("metric"))
 
+	if routes6 then
+		v = m:section(Table, routes6, translate("a_n_routes_kernel6"))
 
-	local routes6 = luci.sys.net.routes6()
+		net = v:option(DummyValue, "iface", translate("network"))
+		function net.cfgvalue(self, section)
+			return luci.tools.webadmin.iface_get_network(routes6[section].device)
+			 or routes6[section].device
+		end
 
-	v = m:section(Table, routes6, translate("a_n_routes_kernel6"))
+		target  = v:option(DummyValue, "target", translate("target"))
+		function target.cfgvalue(self, section)
+			return routes6[section].dest:string()
+		end
 
-	net = v:option(DummyValue, "iface", translate("network"))
+		gateway = v:option(DummyValue, "gateway", translate("gateway6"))
-	function net.cfgvalue(self, section)
+		function gateway.cfgvalue(self, section)
-		return luci.tools.webadmin.iface_get_network(routes6[section].device)
+			return routes6[section].source:string()
-		 or routes6[section].device
+		end
+
+		metric = v:option(DummyValue, "Metric", translate("metric"))
+	    function metric.cfgvalue(self, section)
+	        return string.format( "%08X", routes6[section].metric )
+	    end
 	end
-
-	target  = v:option(DummyValue, "target", translate("target"))
-	function target.cfgvalue(self, section)
-		return routes6[section].dest:string()
-	end
-
-	gateway = v:option(DummyValue, "gateway", translate("gateway6"))
-	function gateway.cfgvalue(self, section)
-		return routes6[section].source:string()
-	end
-
-	metric = v:option(DummyValue, "Metric", translate("metric"))
-    function metric.cfgvalue(self, section)
-        return string.format( "%08X", routes6[section].metric )
-    end
 end
 
 
@@ -89,23 +90,24 @@ s:option(Value, "netmask", translate("netmask"), translate("a_n_r_netmask1")).rm
 
 s:option(Value, "gateway", translate("gateway"))
 
+if routes6 then
+	s = m:section(TypedSection, "route6", translate("a_n_routes_static6"))
+	s.addremove = true
+	s.anonymous = true
 
-s = m:section(TypedSection, "route6", translate("a_n_routes_static6"))
+	s.template  = "cbi/tblsection"
-s.addremove = true
-s.anonymous = true
 
-s.template  = "cbi/tblsection"
+	iface = s:option(ListValue, "interface", translate("interface"))
+	luci.tools.webadmin.cbi_add_networks(iface)
 
-iface = s:option(ListValue, "interface", translate("interface"))
+	if not arg or not arg[1] then
-luci.tools.webadmin.cbi_add_networks(iface)
+		net.titleref = iface.titleref
+	end
 
-if not arg or not arg[1] then
+	s:option(Value, "target", translate("target"), translate("a_n_r_target6"))
-	net.titleref = iface.titleref
+
+	s:option(Value, "gateway", translate("gateway6")).rmempty = true
 end
 
-s:option(Value, "target", translate("target"), translate("a_n_r_target6"))
-
-s:option(Value, "gateway", translate("gateway6")).rmempty = true
-
 
 return m