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 com.google.common.base.Preconditions;
  11 import com.google.common.net.InetAddresses;
  12
  13 import java.net.Inet4Address;
  14 import java.net.Inet6Address;
  15 import java.net.InetAddress;
  16 import java.net.UnknownHostException;
  17 import java.nio.ByteBuffer;
  18
  19 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.IetfInetUtil;
  20 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.IpPrefix;
  21 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.lisp.address.types.rev151105.SimpleAddress;
  22 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.lisp.address.types.rev151105.lisp.address.Address;
  23 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.lisp.address.types.rev151105.lisp.address.address.InstanceId;
  24 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.lisp.address.types.rev151105.lisp.address.address.Ipv4;
  25 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.lisp.address.types.rev151105.lisp.address.address.Ipv4Prefix;
  26 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.lisp.address.types.rev151105.lisp.address.address.Ipv6;
  27 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.lisp.address.types.rev151105.lisp.address.address.Ipv6Prefix;
  28 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.lisp.address.types.rev151105.lisp.address.address.ServicePath;
  29 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.lisp.address.types.rev151105.lisp.address.address.SourceDestKey;
  30 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.lisp.address.types.rev151105.lisp.address.address.source.dest.key.SourceDestKeyBuilder;
  31 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.eid.container.Eid;
  32 import org.slf4j.Logger;
  33 import org.slf4j.LoggerFactory;
  34
  35 public final class MaskUtil {
  36     private static final Logger LOG = LoggerFactory.getLogger(MaskUtil.class);
  37     private static final short IPV4_MAX_MASK = 32;
  38     private static final short IPV6_MAX_MASK = 128;
  39
  40     // Utility class, should not be instantiated
  41     private MaskUtil() {
  42     }
  43
  44     public static boolean isMaskable(Address address) {
  45         if (address instanceof Ipv4Prefix || address instanceof Ipv6Prefix || address instanceof SourceDestKey) {
  46             return true;
  47         } else if (address instanceof InstanceId) {
  48             return isMaskable(((InstanceId)address).getInstanceId().getAddress());
  49         }
  50         return false;
  51     }
  52
  53     public static boolean isMaskable(SimpleAddress address) {
  54         if (address.getIpPrefix() != null) {
  55             return true;
  56         }
  57         return false;
  58     }
  59
  60     private static final int slashPosition(final String prefix) {
  61         final int slash = prefix.lastIndexOf('/');
  62         Preconditions.checkArgument(slash >= 0, "Argument %s does not contain a slash", prefix);
  63         return slash;
  64     }
  65
  66     private static String getPrefixAddress(final String prefix) {
  67         return prefix.substring(0, slashPosition(prefix));
  68     }
  69
  70     private static String getPrefixMask(final String prefix) {
  71         return prefix.substring(slashPosition(prefix) + 1);
  72     }
  73
  74     private static String[] splitPrefix(final String prefix) {
  75         final int slash = slashPosition(prefix);
  76         return new String[] { prefix.substring(0, slash), prefix.substring(slash + 1) };
  77     }
  78
  79     public static Eid normalize(Eid eid, short mask) {
  80         Address address = eid.getAddress();
  81         try {
  82             if (address instanceof Ipv4Prefix) {
  83                 final String addr = getPrefixAddress(((Ipv4Prefix)address).getIpv4Prefix().getValue());
  84                 InetAddress normalized = normalizeIP(InetAddresses.forString(addr), mask);
  85                 return LispAddressUtil.asIpv4PrefixEid(eid, (Inet4Address)normalized, mask);
  86             } else if (address instanceof Ipv6Prefix) {
  87                 final String addr = getPrefixAddress(((Ipv6Prefix)address).getIpv6Prefix().getValue());
  88                 InetAddress normalized = normalizeIP(InetAddresses.forString(addr), mask);
  89                 return LispAddressUtil.asIpv6PrefixEid(eid, (Inet6Address)normalized, mask);
  90             } else if (address instanceof InstanceId) {
  91                 // TODO - not absolutely necessary, but should be implemented
  92                 return eid;
  93             }
  94         } catch (UnknownHostException e) {
  95             LOG.warn("Failed to normalize EID {} with mask {}, returning original EID", eid, mask, e);
  96         }
  97         return eid;
  98     }
  99
 100     public static Eid normalize(Eid eid) {
 101         Address address = eid.getAddress();
 102         try {
 103             if (address instanceof Ipv4Prefix) {
 104                 String[] v4prefix = splitPrefix(((Ipv4Prefix)address).getIpv4Prefix().getValue());
 105                 short mask = Short.parseShort(v4prefix[1]);
 106                 InetAddress normalized = normalizeIP(InetAddresses.forString(v4prefix[0]), mask);
 107                 return LispAddressUtil.asIpv4PrefixEid(eid, (Inet4Address) normalized, mask);
 108             } else if (address instanceof Ipv6Prefix) {
 109                 String[] v6prefix = splitPrefix(((Ipv6Prefix)address).getIpv6Prefix().getValue());
 110                 short mask = Short.parseShort(v6prefix[1]);
 111                 InetAddress normalized = normalizeIP(InetAddresses.forString(v6prefix[0]), mask);
 112                 return LispAddressUtil.asIpv6PrefixEid(eid, (Inet6Address) normalized, mask);
 113             } else if (address instanceof Ipv4) {
 114                 return LispAddressUtil.asIpv4PrefixEid(((Ipv4) address).getIpv4(), eid.getVirtualNetworkId());
 115             } else if (address instanceof Ipv6) {
 116                 return LispAddressUtil.asIpv6PrefixEid(((Ipv6) address).getIpv6(), eid.getVirtualNetworkId());
 117             } else if (address instanceof InstanceId) {
 118                 // TODO - not absolutely necessary, but should be implemented
 119                 return eid;
 120             } else if (address instanceof SourceDestKey) {
 121                 return normalizeSrcDst(eid);
 122             } else if (address instanceof ServicePath) {
 123                 // Build new Service Path eid with service index set to 0
 124                 long spi = ((ServicePath) address).getServicePath().getServicePathId().getValue();
 125                 long vni = eid.getVirtualNetworkId() != null ? eid.getVirtualNetworkId().getValue() : -1;
 126                 return LispAddressUtil.asServicePathEid(vni, spi, (short)0);
 127             }
 128         } catch (UnknownHostException e) {
 129             LOG.warn("Failed to normalize EID {}, returning original", eid, e);
 130         }
 131         return eid;
 132     }
 133
 134     private static Eid normalizeSrcDst(Eid eid) throws UnknownHostException {
 135         final SimpleAddress normalizedSrc = normalizeSimpleAddress(
 136                 ((SourceDestKey) eid.getAddress()).getSourceDestKey().getSource());
 137         final SimpleAddress normalizedDst = normalizeSimpleAddress(
 138                 ((SourceDestKey) eid.getAddress()).getSourceDestKey().getDest());
 139         return LispAddressUtil.asSrcDstEid(new SourceDestKeyBuilder()
 140                 .setSource(normalizedSrc).setDest(normalizedDst).build(), eid.getVirtualNetworkId());
 141     }
 142
 143     private static SimpleAddress normalizeSimpleAddress(SimpleAddress address) throws UnknownHostException {
 144         if (address.getIpPrefix() == null) {
 145             return address;
 146         }
 147         return new SimpleAddress(normalizeIpPrefix(address.getIpPrefix()));
 148     }
 149
 150     private static IpPrefix normalizeIpPrefix(IpPrefix address) throws UnknownHostException {
 151         String[] prefix = splitPrefix(String.valueOf(address.getValue()));
 152         short mask = Short.parseShort(prefix[1]);
 153
 154         InetAddress normalizedAddress = normalizeIP(InetAddresses.forString(prefix[0]), mask);
 155         return IetfInetUtil.INSTANCE.ipPrefixFor(normalizedAddress.getAddress(), mask);
 156     }
 157
 158     private static InetAddress normalizeIP(InetAddress address, int maskLength) throws UnknownHostException {
 159         ByteBuffer byteRepresentation = ByteBuffer.wrap(address.getAddress());
 160         byte b = (byte) 0xff;
 161         int mask = maskLength;
 162         for (int i = 0; i < byteRepresentation.array().length; i++) {
 163             if (mask >= 8) {
 164                 byteRepresentation.put(i, (byte) (b & byteRepresentation.get(i)));
 165             } else if (mask > 0) {
 166                 byteRepresentation.put(i, (byte) ((byte) (b << (8 - mask)) & byteRepresentation.get(i)));
 167             } else {
 168                 byteRepresentation.put(i, (byte) (0 & byteRepresentation.get(i)));
 169             }
 170
 171             mask -= 8;
 172         }
 173         return InetAddress.getByAddress(byteRepresentation.array());
 174     }
 175
 176     public static int getMaxMask(Address address) {
 177         if (address instanceof Ipv4 || address instanceof Ipv4Prefix) {
 178             return IPV4_MAX_MASK;
 179         } else if (address instanceof Ipv6 || address instanceof Ipv6Prefix) {
 180             return IPV6_MAX_MASK;
 181         } else {
 182             return -1;
 183         }
 184     }
 185
 186     public static short getMaskForAddress(SimpleAddress address) {
 187         if (address.getIpPrefix() == null) {
 188             return -1;
 189         }
 190         return getMaskForIpPrefix(address.getIpPrefix());
 191     }
 192
 193     private static String getIpPrefixString(IpPrefix prefix) {
 194         if (prefix.getIpv4Prefix() != null) {
 195             return prefix.getIpv4Prefix().getValue();
 196         } else if (prefix.getIpv6Prefix() != null) {
 197             return prefix.getIpv6Prefix().getValue();
 198         } else {
 199             throw new IllegalArgumentException("Invalid prefix " + prefix);
 200         }
 201     }
 202
 203     public static short getMaskForIpPrefix(IpPrefix prefix) {
 204         return Short.parseShort(getPrefixMask(getIpPrefixString(prefix)));
 205     }
 206
 207     public static String getAddressStringForIpPrefix(IpPrefix prefix) {
 208         return getPrefixAddress(getIpPrefixString(prefix));
 209     }
 210
 211     public static String getAddressStringForIpv4Prefix(Ipv4Prefix prefix) {
 212         return getPrefixAddress(prefix.getIpv4Prefix().getValue());
 213     }
 214
 215     public static String getAddressStringForIpv6Prefix(Ipv6Prefix prefix) {
 216         return getPrefixAddress(prefix.getIpv6Prefix().getValue());
 217     }
 218
 219     public static short getMaskForAddress(Address address) {
 220         if (address instanceof Ipv4) {
 221             return IPV4_MAX_MASK;
 222         } else if (address instanceof Ipv6) {
 223             return IPV6_MAX_MASK;
 224         } else if (address instanceof Ipv4Prefix) {
 225             return Short.parseShort(getPrefixMask(((Ipv4Prefix)address).getIpv4Prefix().getValue()));
 226         } else if (address instanceof Ipv6Prefix) {
 227             return Short.parseShort(getPrefixMask(((Ipv6Prefix)address).getIpv6Prefix().getValue()));
 228         } else if (address instanceof InstanceId) {
 229             return getMaskForAddress(((InstanceId)address).getInstanceId().getAddress());
 230         }
 231         return -1;
 232     }
 233 }