X-Git-Url: https://gerrit.fd.io/r/gitweb?p=csit.git;a=blobdiff_plain;f=resources%2Flibraries%2Fpython%2FIPUtil.py;h=4b6e2766d892f0c9554da86954ddebad455c7a00;hp=3e002b3495c46b988337d6be902e15085b834147;hb=481744b2732ab840a00129bacb5994baa19e125c;hpb=33499c81c94c2d3baef9d3e9f061cd76ef86fa74

diff --git a/resources/libraries/python/IPUtil.py b/resources/libraries/python/IPUtil.py
index 3e002b3495..4b6e2766d8 100644
--- a/resources/libraries/python/IPUtil.py
+++ b/resources/libraries/python/IPUtil.py
@@ -12,25 +12,25 @@
 # limitations under the License.
 
 """Common IP utilities library."""
+from ipaddress import IPv4Network
 
-from ssh import SSH
-from constants import Constants
+from resources.libraries.python.ssh import SSH
+from resources.libraries.python.constants import Constants
 
 
 class IPUtil(object):
     """Common IP utilities"""
 
-    def __init__(self):
-        pass
-
     @staticmethod
     def vpp_ip_probe(node, interface, addr):
         """Run ip probe on VPP node.
 
-           Args:
-               node (Dict): VPP node.
-               interface (str): Interface name
-               addr (str): IPv4/IPv6 address
+        :param node: VPP node.
+        :param interface: Interface name.
+        :param addr: IPv4/IPv6 address.
+        :type node: dict
+        :type interface: str
+        :type addr: str
         """
         ssh = SSH()
         ssh.connect(node)
@@ -41,3 +41,24 @@ class IPUtil(object):
         if int(ret_code) != 0:
             raise Exception('VPP ip probe {dev} {ip} failed on {h}'.format(
                 dev=interface, 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 net.netmask
+    elif isinstance(network, basestring):
+        return net.prefixlen
+    else:
+        raise Exception("Value {0} is not a valid ipv4 netmask or network"
+                        " prefix length".format(network))