bgp/extensions/linkstate/src/main/java/org/opendaylight/protocol/bgp/linkstate/impl/attribute/sr/BindingSidLabelParser.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 package org.opendaylight.protocol.bgp.linkstate.impl.attribute.sr;
   9
  10 import io.netty.buffer.ByteBuf;
  11 import java.util.List;
  12 import org.opendaylight.protocol.bgp.linkstate.spi.pojo.SimpleBindingSubTlvsRegistry;
  13 import org.opendaylight.protocol.util.BitArray;
  14 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev180329.ProtocolId;
  15 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev180329.prefix.state.SrBindingSidLabels;
  16 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev180329.prefix.state.SrBindingSidLabelsBuilder;
  17 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.Weight;
  18 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.binding.sid.tlv.BindingSubTlvs;
  19 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.binding.sid.tlv.Flags;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.binding.sid.tlv.flags.IsisBindingFlagsCase;
  21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.binding.sid.tlv.flags.IsisBindingFlagsCaseBuilder;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.binding.sid.tlv.flags.OspfBindingFlagsCase;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.binding.sid.tlv.flags.OspfBindingFlagsCaseBuilder;
  24
  25 public final class BindingSidLabelParser {
  26     /* Flags */
  27     private static final int FLAGS_SIZE = 8;
  28     private static final int AFI = 0;
  29     private static final int MIRROR_CONTEXT = 1;
  30     private static final int MIRROR_CONTEXT_OSPF = 0;
  31     private static final int SPREAD_TLV = 2;
  32     private static final int LEAKED = 3;
  33     private static final int ATTACHED = 4;
  34
  35     /* SID Label Tlv types */
  36     private static final int RESERVED_BINDING_SID = 2;
  37
  38     private BindingSidLabelParser() {
  39
  40     }
  41
  42     public static SrBindingSidLabels parseBindingSidLabel(final ByteBuf buffer, final ProtocolId protocolId) {
  43         final SrBindingSidLabelsBuilder bindingSid = new SrBindingSidLabelsBuilder();
  44         bindingSid.setWeight(new Weight(buffer.readUnsignedByte()));
  45         final BitArray flags = BitArray.valueOf(buffer, FLAGS_SIZE);
  46         bindingSid.setFlags(parseBindingSidFlags(flags, protocolId));
  47         buffer.skipBytes(RESERVED_BINDING_SID);
  48         bindingSid.setBindingSubTlvs(
  49             SimpleBindingSubTlvsRegistry.getInstance().parseBindingSubTlvs(buffer, protocolId));
  50         return bindingSid.build();
  51     }
  52
  53     private static Flags parseBindingSidFlags(final BitArray flags, final ProtocolId protocol) {
  54         switch (protocol) {
  55             case IsisLevel1:
  56             case IsisLevel2:
  57                 return new IsisBindingFlagsCaseBuilder().setAddressFamily(flags.get(AFI))
  58                         .setMirrorContext(flags.get(MIRROR_CONTEXT))
  59                         .setSpreadTlv(flags.get(SPREAD_TLV)).setLeakedFromLevel2(flags.get(LEAKED))
  60                         .setAttachedFlag(flags.get(ATTACHED)).build();
  61             case Ospf:
  62             case OspfV3:
  63                 return new OspfBindingFlagsCaseBuilder().setMirroring(flags.get(MIRROR_CONTEXT_OSPF)).build();
  64             default:
  65                 return null;
  66         }
  67     }
  68
  69     public static void serializeBindingSidAttributes(final Weight weight, final Flags flags,
  70             final List<BindingSubTlvs> bindingSubTlvs, final ByteBuf aggregator) {
  71         aggregator.writeByte(weight.getValue());
  72         final BitArray bitFlags = serializeBindingSidFlags(flags);
  73         bitFlags.toByteBuf(aggregator);
  74         aggregator.writeZero(RESERVED_BINDING_SID);
  75         SimpleBindingSubTlvsRegistry.getInstance().serializeBindingSubTlvs(bindingSubTlvs, aggregator);
  76     }
  77
  78     private static BitArray serializeBindingSidFlags(final Flags flags) {
  79         final BitArray bitFlags = new BitArray(FLAGS_SIZE);
  80         if (flags instanceof IsisBindingFlagsCase) {
  81             final IsisBindingFlagsCase isisFlags = (IsisBindingFlagsCase) flags;
  82             bitFlags.set(AFI, isisFlags.isAddressFamily());
  83             bitFlags.set(MIRROR_CONTEXT, isisFlags.isMirrorContext());
  84             bitFlags.set(SPREAD_TLV, isisFlags.isSpreadTlv());
  85             bitFlags.set(LEAKED, isisFlags.isLeakedFromLevel2());
  86             bitFlags.set(ATTACHED, isisFlags.isAttachedFlag());
  87         } else if (flags instanceof OspfBindingFlagsCase) {
  88             final OspfBindingFlagsCase ospfFlags = (OspfBindingFlagsCase) flags;
  89             bitFlags.set(MIRROR_CONTEXT_OSPF, ospfFlags.isMirroring());
  90         }
  91         return bitFlags;
  92     }
  93 }