+ dev=iface_name, ip=addr, h=node['host']))
+
+
+def convert_ipv4_netmask_prefix(network):
+ """Convert network mask to equivalent network prefix length or vice versa.
+
+ Example: mask 255.255.0.0 -> prefix length 16
+ :param network: Network mask or network prefix length.
+ :type network: str or int
+ :return: Network mask or network prefix length.
+ :rtype: str or int
+ """
+ temp_address = "0.0.0.0"
+ net = IPv4Network(u"{0}/{1}".format(temp_address, network), False)
+
+ if isinstance(network, int) and (0 < network < 33):
+ return str(net.netmask)
+ elif isinstance(network, basestring):
+ return int(net.prefixlen)
+ else:
+ raise Exception("Value {0} is not a valid ipv4 netmask or network"
+ " prefix length".format(network))