netmode: enable by default and auto-detect mode

netmode/files/etc/config/netmode

@@ -1,2 +1,2 @@
 config netmode global
-	option enabled 0
+	option enabled 1

netmode/files/etc/uci-defaults/40_netmode_set_default_netmode

@@ -0,0 +1,29 @@
+#!/bin/sh
+
+enabled="$(uci -q get netmode.global.enabled)"
+[ "$enabled" == "1" ] || exit 0
+
+mode="$(uci -q get netmode.global.mode)"
+[ -n "$mode" ] && exit 0
+
+[ -f /etc/netmodes/supported_modes.json ] || exit 0
+
+# NetMode is enabled without a Mode being set
+# Figure out the current mode from network config
+wanproto=$(uci -q get network.wan.proto)
+curmode=""
+case "$wanproto" in
+	dhcp) curmode="routed-dhcp" ;;
+	pppoe) curmode="routed-pppoe" ;;
+	static) curmode="routed-static" ;;
+esac
+
+found=0
+for md in $(jsonfilter -i /etc/netmodes/supported_modes.json -e "@.supported_modes.*.name"); do
+	[ "$md" == "$curmode" ] && found=1
+done
+
+if [ $found -eq 1 ]; then
+	uci -q set netmode.global.mode="$curmode"
+	echo "$curmode" > /etc/netmodes/.last_mode
+fi