bgp/evpn/src/main/java/org/opendaylight/protocol/bgp/evpn/impl/nlri/EthSegRParser.java

   1 /*
   2  * Copyright (c) 2016 Cisco Systems, 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
   9 package org.opendaylight.protocol.bgp.evpn.impl.nlri;
  10
  11 import static org.opendaylight.protocol.bgp.evpn.impl.nlri.NlriModelUtil.extractOrigRouteIp;
  12
  13 import com.google.common.base.Preconditions;
  14 import io.netty.buffer.ByteBuf;
  15 import io.netty.buffer.Unpooled;
  16 import org.opendaylight.protocol.bgp.evpn.spi.pojo.SimpleEsiTypeRegistry;
  17 import org.opendaylight.protocol.util.Ipv4Util;
  18 import org.opendaylight.protocol.util.Ipv6Util;
  19 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.IpAddress;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.evpn.rev160321.NlriType;
  21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.evpn.rev160321.es.route.EsRoute;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.evpn.rev160321.es.route.EsRouteBuilder;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.evpn.rev160321.esi.Esi;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.evpn.rev160321.evpn.EvpnChoice;
  25 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.evpn.rev160321.evpn.evpn.choice.EsRouteCase;
  26 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.evpn.rev160321.evpn.evpn.choice.EsRouteCaseBuilder;
  27 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
  28 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  29
  30 final class EthSegRParser extends AbstractEvpnNlri {
  31     protected static final NodeIdentifier ES_ROUTE_NID = new NodeIdentifier(EsRoute.QNAME);
  32     private static final int CONTENT_LENGTH = 15;
  33     private static final int CONTENT_LENGTH2 = 27;
  34
  35     @Override
  36     public EvpnChoice parseEvpn(final ByteBuf buffer) {
  37         Preconditions.checkArgument(buffer.readableBytes() == CONTENT_LENGTH || buffer.readableBytes() == CONTENT_LENGTH2,
  38             "Wrong length of array of bytes. Passed: %s ;", buffer);
  39
  40         final Esi esi = SimpleEsiTypeRegistry.getInstance().parseEsi(buffer.readSlice(ESI_SIZE));
  41         final IpAddress ip = Preconditions.checkNotNull(parseOrigRouteIp(buffer));
  42
  43         final EsRouteBuilder builder = new EsRouteBuilder().setEsi(esi).setOrigRouteIp(ip);
  44         return new EsRouteCaseBuilder().setEsRoute(builder.build()).build();
  45     }
  46
  47     @Override
  48     protected NlriType getType() {
  49         return NlriType.EthSeg;
  50     }
  51
  52     @Override
  53     public ByteBuf serializeBody(final EvpnChoice evpnInput) {
  54         Preconditions.checkArgument(evpnInput instanceof EsRouteCase, "Unknown evpn instance. Passed %s. Needed EsRouteCase.",
  55             evpnInput.getClass());
  56         return serializeBody(((EsRouteCase) evpnInput).getEsRoute());
  57     }
  58
  59     @Override
  60     public EvpnChoice serializeEvpnModel(final ContainerNode evpnCase) {
  61         return createRouteKey(evpnCase);
  62     }
  63
  64     @Override
  65     public EvpnChoice createRouteKey(final ContainerNode evpn) {
  66         final EsRouteBuilder builder = new EsRouteBuilder();
  67         builder.setEsi(serializeEsi(evpn));
  68         builder.setOrigRouteIp(extractOrigRouteIp(evpn));
  69         return new EsRouteCaseBuilder().setEsRoute(builder.build()).build();
  70     }
  71
  72     private static ByteBuf serializeBody(final EsRoute evpn) {
  73         final ByteBuf body = Unpooled.buffer();
  74         SimpleEsiTypeRegistry.getInstance().serializeEsi(evpn.getEsi(), body);
  75         final ByteBuf orig = serializeOrigRouteIp(evpn.getOrigRouteIp());
  76         Preconditions.checkArgument(orig.readableBytes() > 0);
  77         body.writeBytes(orig);
  78         return body;
  79     }
  80
  81     public static IpAddress parseOrigRouteIp(final ByteBuf buffer) {
  82         final int ipLength = buffer.readUnsignedByte();
  83         if (ipLength == Ipv6Util.IPV6_BITS_LENGTH) {
  84             return new IpAddress(Ipv6Util.addressForByteBuf(buffer));
  85         } else if (ipLength == Ipv4Util.IP4_BITS_LENGTH) {
  86             return new IpAddress(Ipv4Util.addressForByteBuf(buffer));
  87         }
  88         return null;
  89     }
  90
  91     static ByteBuf serializeOrigRouteIp(final IpAddress origRouteIp) {
  92         final ByteBuf body = Unpooled.buffer();
  93         if (origRouteIp.getIpv4Address() != null) {
  94             body.writeByte(Ipv4Util.IP4_BITS_LENGTH);
  95             body.writeBytes(Ipv4Util.bytesForAddress(origRouteIp.getIpv4Address()));
  96         } else if (origRouteIp.getIpv6Address() != null) {
  97             body.writeByte(Ipv6Util.IPV6_BITS_LENGTH);
  98             body.writeBytes(Ipv6Util.bytesForAddress(origRouteIp.getIpv6Address()));
  99         } else {
 100             body.writeZero(ZERO_BYTE);
 101         }
 102         return body;
 103     }
 104 }