--- /dev/null
+#!/bin/sh
+. /etc/functions.sh
+. /lib/netifd/netifd-proto.sh
+
+find_3g_iface() {
+ local cfg="$1"
+ local tty="$2"
+
+ local proto
+ config_get proto "$cfg" proto
+ [ "$proto" = 3g ] || return 0
+
+ local dev
+ config_get dev "$cfg" device
+
+ if [ "${dev##*/}" = "${tty##*/}" ]; then
+ if [ "$ACTION" = add ]; then
+ available=1
+ else
+ available=0
+ fi
+ proto_set_available "$cfg" $available
+ fi
+}
+
+case "$DEVICENAME" in
+ tty*)
+ [ -e "/dev/$DEVICENAME" ] || [ "$ACTION" = remove ] || exit 0
+ config_load network
+ config_foreach find_3g_iface interface "/dev/$DEVICENAME"
+ ;;
+esac
+