This file will contain common procedures to deal with network interfaces.
Initially provides network_get_ipaddr(), network_get_ipaddr6(),
network_get_subnet() and network_get_subnet6() to determine the
primary IP addresses or subnets of a given logical interface.
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@31935 3c298f89-4303-0410-b956-a3cf2f4a3e73