renderers/vpp/src/main/java/org/opendaylight/groupbasedpolicy/renderer/vpp/lisp/util/IpAddressUtil.java

   1 /*
   2  * Copyright (c) 2017 Cisco Systems. All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.groupbasedpolicy.renderer.vpp.lisp.util;
  10
  11 import com.google.common.net.InetAddresses;
  12 import org.apache.commons.lang3.tuple.ImmutablePair;
  13 import org.apache.commons.lang3.tuple.Pair;
  14 import org.apache.commons.net.util.SubnetUtils;
  15 import org.opendaylight.groupbasedpolicy.renderer.vpp.lisp.exception.LispHelperArgumentException;
  16 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Address;
  17 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Prefix;
  18 import org.slf4j.Logger;
  19 import org.slf4j.LoggerFactory;
  20
  21 import java.net.InetAddress;
  22 import java.net.UnknownHostException;
  23
  24 /**
  25  * Created by Shakib Ahmed on 5/3/17.
  26  */
  27 public class IpAddressUtil {
  28     private static final Logger LOG = LoggerFactory.getLogger(IpAddressUtil.class);
  29
  30     public static Pair<Ipv4Address, Ipv4Address> getStartAndEndIp(Ipv4Prefix ipv4Prefix) {
  31         SubnetUtils subnetUtils = new SubnetUtils(ipv4Prefix.getValue());
  32         SubnetUtils.SubnetInfo prefixSubnetInfo = subnetUtils.getInfo();
  33         Ipv4Address lowIp = new Ipv4Address(prefixSubnetInfo.getLowAddress());
  34         Ipv4Address highIp = new Ipv4Address(prefixSubnetInfo.getHighAddress());
  35         return new ImmutablePair<>(lowIp, highIp);
  36     }
  37
  38     public static Pair<Ipv4Prefix, Ipv4Prefix> getSmallerSubnet(Ipv4Prefix ipv4Prefix) throws LispHelperArgumentException {
  39         String cidrNotion = ipv4Prefix.getValue();
  40
  41         SubnetUtils subnetUtils = new SubnetUtils(cidrNotion);
  42         String firstSubnet;
  43         String secondSubnet;
  44         int maskLen = Integer.valueOf(cidrNotion.split("/")[1]) + 1;
  45
  46         if (maskLen > 32) {
  47             return new ImmutablePair<>(ipv4Prefix, ipv4Prefix);
  48         }
  49
  50         SubnetUtils.SubnetInfo subnetInfo = subnetUtils.getInfo();
  51         try {
  52             int lowValue = InetAddresses.coerceToInteger(InetAddress.getByName(subnetInfo.getNetworkAddress()));
  53             int highValue = InetAddresses.coerceToInteger(InetAddress.getByName(subnetInfo.getHighAddress())) + 1;
  54             InetAddress middleAddress = InetAddresses.fromInteger(lowValue + (highValue - lowValue + 1) / 2);
  55             String firstAddress = subnetInfo.getNetworkAddress();
  56             String secondAddress = middleAddress.getHostAddress();
  57             firstSubnet = firstAddress + "/" + maskLen;
  58             secondSubnet = secondAddress + "/" + maskLen;
  59         } catch (UnknownHostException e) {
  60             LOG.warn("Failed to translate IP address " + cidrNotion+ " to smaller subnet");
  61             throw new LispHelperArgumentException("Invalid argument for subnet " + cidrNotion);
  62         }
  63         return new ImmutablePair<>(new Ipv4Prefix(firstSubnet), new Ipv4Prefix(secondSubnet));
  64     }
  65 }