main/busybox-initscripts: support multiple dhcp interfaces

We set the metric to 300 + ifindex for wifi and 200 + ifindex for
others. This is basically what dhcpcd does.

Also allow overriding the metric in interfaces file.

This makes multi isp setups easier.

1 files changed, 23 insertions, 4 deletions

diff --git a/main/busybox-initscripts/default.script b/main/busybox-initscripts/default.script
index c6cfbc5be1..5447080ec9 100644
--- a/main/busybox-initscripts/default.script
+++ b/main/busybox-initscripts/default.script
@@ -34,16 +34,35 @@ deconfig() {
 	ip addr flush dev $interface
 }
 
+is_wifi() {
+	test -e /sys/class/net/$interface/phy80211
+}
+
+if_index() {
+	cat /sys/class/net/$interface/ifindex
+}
+
+calc_metric() {
+	local base=
+	if is_wifi; then
+		base=300
+	else
+		base=200
+	fi
+	echo $(( $base + $(if_index) ))
+}
+
 routes() {
 	[ -z "$router" ] && return
-	local gw metric
+	local gw= num=
 	while ip route del default via dev $interface 2>/dev/null; do
 		:
 	done
-	metric=0
+	num=0
 	for gw in $router; do
-		route add default gw $gw dev $interface metric $metric
-		metric=$(( $metric + 1 ))
+		ip route add 0.0.0.0/0 via $gw dev $interface \
+			metric $(( $num + ${IF_METRIC:-$(calc_metric)} ))
+		num=$(( $num + 1 ))
 	done
 }