mappingservice/lisp-proto/src/main/java/org/opendaylight/lispflowmapping/lisp/util/MaskUtil.java

   1 /*
   2  * Copyright (c) 2014 Contextream, Inc. and others.  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 package org.opendaylight.lispflowmapping.lisp.util;
   9
  10 import java.net.Inet4Address;
  11 import java.net.Inet6Address;
  12 import java.net.InetAddress;
  13 import java.net.UnknownHostException;
  14 import java.nio.ByteBuffer;
  15
  16 import org.apache.commons.lang3.exception.ExceptionUtils;
  17 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.IpPrefix;
  18 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.lisp.address.types.rev151105.SimpleAddress;
  19 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.lisp.address.types.rev151105.lisp.address.Address;
  20 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.lisp.address.types.rev151105.lisp.address.address.InstanceId;
  21 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.lisp.address.types.rev151105.lisp.address.address.Ipv4;
  22 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.lisp.address.types.rev151105.lisp.address.address.Ipv4Prefix;
  23 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.lisp.address.types.rev151105.lisp.address.address.Ipv6;
  24 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.lisp.address.types.rev151105.lisp.address.address.Ipv6Prefix;
  25 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.lisp.address.types.rev151105.lisp.address.address.SourceDestKey;
  26 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.eid.container.Eid;
  27 import org.slf4j.Logger;
  28 import org.slf4j.LoggerFactory;
  29
  30 public class MaskUtil {
  31     private static final Logger LOG = LoggerFactory.getLogger(MaskUtil.class);
  32     private static final short IPV4_MAX_MASK = 32;
  33     private static final short IPV6_MAX_MASK = 128;
  34
  35     public static boolean isMaskable(Address address) {
  36         if (address instanceof Ipv4Prefix || address instanceof Ipv6Prefix || address instanceof SourceDestKey) {
  37             return true;
  38         } else if (address instanceof InstanceId) {
  39             return isMaskable(((InstanceId)address).getInstanceId().getAddress());
  40         }
  41         return false;
  42     }
  43
  44     public static boolean isMaskable(SimpleAddress address) {
  45         if (address.getIpPrefix() != null) {
  46             return true;
  47         }
  48         return false;
  49     }
  50
  51     public static Eid normalize(Eid eid, short mask) {
  52         Address address = eid.getAddress();
  53         try {
  54             if (address instanceof Ipv4Prefix) {
  55                 String[] v4prefix = String.valueOf(((Ipv4Prefix)address).getIpv4Prefix().getValue()).split("/");
  56                 InetAddress normalized = normalizeIP(Inet4Address.getByName(v4prefix[0]), mask);
  57                 return LispAddressUtil.asIpv4PrefixEid(eid, (Inet4Address)normalized, mask);
  58             } else if (address instanceof Ipv6Prefix) {
  59                 String[] v6prefix = String.valueOf(((Ipv6Prefix)address).getIpv6Prefix().getValue()).split("/");
  60                 InetAddress normalized = normalizeIP(Inet6Address.getByName(v6prefix[0]), mask);
  61                 return LispAddressUtil.asIpv6PrefixEid(eid, (Inet6Address)normalized, mask);
  62             } else if (address instanceof InstanceId) {
  63                 // TODO - not absolutely necessary, but should be implemented
  64                 return eid;
  65             }
  66         } catch (UnknownHostException e) {
  67             LOG.trace("Failed to normalize eid {} with mask {}: {}", eid, mask, ExceptionUtils.getStackTrace(e));
  68         }
  69         return eid;
  70     }
  71
  72     public static Eid normalize(Eid eid) {
  73         Address address = eid.getAddress();
  74         try {
  75             if (address instanceof Ipv4Prefix) {
  76                 String[] v4prefix = String.valueOf(((Ipv4Prefix)address).getIpv4Prefix().getValue()).split("/");
  77                 short mask = Short.parseShort(v4prefix[1]);
  78                 InetAddress normalized = normalizeIP(Inet4Address.getByName(v4prefix[0]), mask);
  79                 return LispAddressUtil.asIpv4PrefixEid(eid, (Inet4Address)normalized, mask);
  80             } else if (address instanceof Ipv6Prefix) {
  81                 String[] v6prefix = String.valueOf(((Ipv6Prefix)address).getIpv6Prefix().getValue()).split("/");
  82                 short mask = Short.parseShort(v6prefix[1]);
  83                 InetAddress normalized = normalizeIP(Inet6Address.getByName(v6prefix[0]), mask);
  84                 return LispAddressUtil.asIpv6PrefixEid(eid, (Inet6Address)normalized, mask);
  85             } else if (address instanceof InstanceId) {
  86                 // TODO - not absolutely necessary, but should be implemented
  87                 return eid;
  88             }
  89         } catch (UnknownHostException e) {
  90             LOG.trace("Failed to normalize eid {}: {}", eid, ExceptionUtils.getStackTrace(e));
  91         }
  92         return eid;
  93     }
  94
  95     private static InetAddress normalizeIP(InetAddress address, int mask) throws UnknownHostException {
  96         ByteBuffer byteRepresentation = ByteBuffer.wrap(address.getAddress());
  97         byte b = (byte) 0xff;
  98         for (int i = 0; i < byteRepresentation.array().length; i++) {
  99             if (mask >= 8) {
 100                 byteRepresentation.put(i, (byte) (b & byteRepresentation.get(i)));
 101             } else if (mask > 0) {
 102                 byteRepresentation.put(i, (byte) ((byte) (b << (8 - mask)) & byteRepresentation.get(i)));
 103             } else {
 104                 byteRepresentation.put(i, (byte) (0 & byteRepresentation.get(i)));
 105             }
 106
 107             mask -= 8;
 108         }
 109         return InetAddress.getByAddress(byteRepresentation.array());
 110     }
 111
 112     public static int getMaxMask(Address address) {
 113         if (address instanceof Ipv4 || address instanceof Ipv4Prefix) {
 114             return IPV4_MAX_MASK;
 115         } else if (address instanceof Ipv6 || address instanceof Ipv6Prefix) {
 116             return IPV6_MAX_MASK;
 117         } else {
 118             return -1;
 119         }
 120     }
 121
 122     public static short getMaskForAddress(SimpleAddress address) {
 123         if (address.getIpPrefix() == null) {
 124             return -1;
 125         }
 126         return getMaskForIpPrefix(address.getIpPrefix());
 127     }
 128
 129     public static short getMaskForIpPrefix(IpPrefix prefix) {
 130         return Short.parseShort(String.valueOf(prefix.getValue()).split("/")[1]);
 131     }
 132
 133     public static String getAddressStringForIpPrefix(IpPrefix prefix) {
 134         return String.valueOf(prefix.getValue()).split("/")[0];
 135     }
 136
 137     public static String getAddressStringForIpv4Prefix(Ipv4Prefix prefix) {
 138         return String.valueOf(prefix.getIpv4Prefix().getValue()).split("/")[0];
 139     }
 140
 141     public static String getAddressStringForIpv6Prefix(Ipv6Prefix prefix) {
 142         return String.valueOf(prefix.getIpv6Prefix().getValue()).split("/")[0];
 143     }
 144
 145     public static short getMaskForAddress(Address address) {
 146         if (address instanceof Ipv4) {
 147             return IPV4_MAX_MASK;
 148         } else if (address instanceof Ipv6) {
 149             return IPV6_MAX_MASK;
 150         } else if (address instanceof Ipv4Prefix) {
 151             String[] prefix = String.valueOf(((Ipv4Prefix)address).getIpv4Prefix().getValue()).split("/");  // TODO use something more efficient
 152             return Short.parseShort(prefix[1]);
 153         } else if (address instanceof Ipv6Prefix) {
 154             String[] prefix = String.valueOf(((Ipv6Prefix)address).getIpv6Prefix().getValue()).split("/");  // TODO use something more efficient
 155             return Short.parseShort(prefix[1]);
 156         } else if (address instanceof InstanceId) {
 157             return getMaskForAddress(((InstanceId)address).getInstanceId().getAddress());
 158         }
 159         return -1;
 160     }
 161 }