bgp/flowspec/src/main/java/org/opendaylight/protocol/bgp/flowspec/extended/communities/RedirectIpNextHopEcHandler.java

   1 /*
   2  * Copyright (c) 2015 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.flowspec.extended.communities;
  10
  11 import com.google.common.base.Preconditions;
  12 import io.netty.buffer.ByteBuf;
  13 import org.opendaylight.protocol.bgp.parser.BGPDocumentedException;
  14 import org.opendaylight.protocol.bgp.parser.BGPParsingException;
  15 import org.opendaylight.protocol.bgp.parser.spi.extended.community.ExtendedCommunityParser;
  16 import org.opendaylight.protocol.bgp.parser.spi.extended.community.ExtendedCommunitySerializer;
  17 import org.opendaylight.protocol.util.ByteBufWriteUtil;
  18 import org.opendaylight.protocol.util.Ipv4Util;
  19 import org.opendaylight.protocol.util.Ipv6Util;
  20 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpAddress;
  21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev180329.redirect.ip.nh.extended.community.RedirectIpNhExtendedCommunity;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev180329.redirect.ip.nh.extended.community.RedirectIpNhExtendedCommunityBuilder;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev180329.update.attributes.extended.communities.extended.community.RedirectIpNhExtendedCommunityCaseBuilder;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev180329.extended.community.ExtendedCommunity;
  25
  26 public class RedirectIpNextHopEcHandler implements ExtendedCommunityParser, ExtendedCommunitySerializer {
  27
  28     //https://tools.ietf.org/html/draft-ietf-idr-flowspec-redirect-ip-00#section-7
  29     private static final int TYPE = 8;
  30
  31     private static final int SUBTYPE = 0;
  32
  33     private static final byte COPY = 0x1;
  34
  35     @Override
  36     public void serializeExtendedCommunity(final ExtendedCommunity extendedCommunity, final ByteBuf byteAggregator) {
  37         Preconditions.checkArgument(extendedCommunity instanceof org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev180329.RedirectIpNhExtendedCommunity,
  38                 "The extended community %s is not RedirectIpNhExtendedCommunityCase type.", extendedCommunity);
  39         final RedirectIpNhExtendedCommunity redirect = ((org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev180329.RedirectIpNhExtendedCommunity) extendedCommunity).getRedirectIpNhExtendedCommunity();
  40         final IpAddress nextHopAddress = redirect.getNextHopAddress();
  41         if (nextHopAddress.getIpv4Address() != null) {
  42             ByteBufWriteUtil.writeIpv4Address(nextHopAddress.getIpv4Address(), byteAggregator);
  43         } else {
  44             ByteBufWriteUtil.writeIpv6Address(nextHopAddress.getIpv6Address(), byteAggregator);
  45         }
  46         ByteBufWriteUtil.writeUnsignedShort((redirect.isCopy() == null || !redirect.isCopy()) ? 0 : 1, byteAggregator);
  47     }
  48
  49     @Override
  50     public ExtendedCommunity parseExtendedCommunity(final ByteBuf buffer) throws BGPDocumentedException, BGPParsingException {
  51         final RedirectIpNhExtendedCommunityBuilder builder = new RedirectIpNhExtendedCommunityBuilder();
  52         if (buffer.readableBytes() > Ipv6Util.IPV6_LENGTH ) {
  53             builder.setNextHopAddress(new IpAddress(Ipv6Util.addressForByteBuf(buffer)));
  54         } else {
  55             builder.setNextHopAddress(new IpAddress(Ipv4Util.addressForByteBuf(buffer)));
  56         }
  57         builder.setCopy((buffer.readUnsignedShort() & COPY) == 1);
  58         return new RedirectIpNhExtendedCommunityCaseBuilder().setRedirectIpNhExtendedCommunity(builder.build()).build();
  59     }
  60
  61     @Override
  62     public int getType(final boolean isTransitive) {
  63         return TYPE;
  64     }
  65
  66     @Override
  67     public int getSubType() {
  68         return SUBTYPE;
  69     }
  70
  71 }