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.rev200120.ProtocolId;
  15 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev200120.prefix.state.SrBindingSidLabels;
  16 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev200120.prefix.state.SrBindingSidLabelsBuilder;
  17 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev200120.Weight;
  18 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev200120.binding.sid.tlv.BindingSubTlvs;
  19 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev200120.binding.sid.tlv.Flags;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev200120.binding.sid.tlv.flags.IsisBindingFlagsCase;
  21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev200120.binding.sid.tlv.flags.IsisBindingFlagsCaseBuilder;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev200120.binding.sid.tlv.flags.OspfBindingFlagsCase;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev200120.binding.sid.tlv.flags.OspfBindingFlagsCaseBuilder;
  24 import org.opendaylight.yangtools.yang.common.netty.ByteBufUtils;
  25
  26 public final class BindingSidLabelParser {
  27     /* Flags */
  28     private static final int FLAGS_SIZE = 8;
  29     private static final int AFI = 0;
  30     private static final int MIRROR_CONTEXT = 1;
  31     private static final int MIRROR_CONTEXT_OSPF = 0;
  32     private static final int SPREAD_TLV = 2;
  33     private static final int LEAKED = 3;
  34     private static final int ATTACHED = 4;
  35
  36     /* SID Label Tlv types */
  37     private static final int RESERVED_BINDING_SID = 2;
  38
  39     private BindingSidLabelParser() {
  40
  41     }
  42
  43     public static SrBindingSidLabels parseBindingSidLabel(final ByteBuf buffer, final ProtocolId protocolId) {
  44         final SrBindingSidLabelsBuilder bindingSid = new SrBindingSidLabelsBuilder();
  45         bindingSid.setWeight(new Weight(ByteBufUtils.readUint8(buffer)));
  46         final BitArray flags = BitArray.valueOf(buffer, FLAGS_SIZE);
  47         bindingSid.setFlags(parseBindingSidFlags(flags, protocolId));
  48         buffer.skipBytes(RESERVED_BINDING_SID);
  49         bindingSid.setBindingSubTlvs(
  50             SimpleBindingSubTlvsRegistry.getInstance().parseBindingSubTlvs(buffer, protocolId));
  51         return bindingSid.build();
  52     }
  53
  54     private static Flags parseBindingSidFlags(final BitArray flags, final ProtocolId protocol) {
  55         switch (protocol) {
  56             case IsisLevel1:
  57             case IsisLevel2:
  58                 return new IsisBindingFlagsCaseBuilder().setAddressFamily(flags.get(AFI))
  59                         .setMirrorContext(flags.get(MIRROR_CONTEXT))
  60                         .setSpreadTlv(flags.get(SPREAD_TLV)).setLeakedFromLevel2(flags.get(LEAKED))
  61                         .setAttachedFlag(flags.get(ATTACHED)).build();
  62             case Ospf:
  63             case OspfV3:
  64                 return new OspfBindingFlagsCaseBuilder().setMirroring(flags.get(MIRROR_CONTEXT_OSPF)).build();
  65             default:
  66                 return null;
  67         }
  68     }
  69
  70     public static void serializeBindingSidAttributes(final Weight weight, final Flags flags,
  71             final List<BindingSubTlvs> bindingSubTlvs, final ByteBuf aggregator) {
  72         aggregator.writeByte(weight.getValue().toJava());
  73         final BitArray bitFlags = serializeBindingSidFlags(flags);
  74         bitFlags.toByteBuf(aggregator);
  75         aggregator.writeZero(RESERVED_BINDING_SID);
  76         SimpleBindingSubTlvsRegistry.getInstance().serializeBindingSubTlvs(bindingSubTlvs, aggregator);
  77     }
  78
  79     private static BitArray serializeBindingSidFlags(final Flags flags) {
  80         final BitArray bitFlags = new BitArray(FLAGS_SIZE);
  81         if (flags instanceof IsisBindingFlagsCase) {
  82             final IsisBindingFlagsCase isisFlags = (IsisBindingFlagsCase) flags;
  83             bitFlags.set(AFI, isisFlags.getAddressFamily());
  84             bitFlags.set(MIRROR_CONTEXT, isisFlags.getMirrorContext());
  85             bitFlags.set(SPREAD_TLV, isisFlags.getSpreadTlv());
  86             bitFlags.set(LEAKED, isisFlags.getLeakedFromLevel2());
  87             bitFlags.set(ATTACHED, isisFlags.getAttachedFlag());
  88         } else if (flags instanceof OspfBindingFlagsCase) {
  89             final OspfBindingFlagsCase ospfFlags = (OspfBindingFlagsCase) flags;
  90             bitFlags.set(MIRROR_CONTEXT_OSPF, ospfFlags.getMirroring());
  91         }
  92         return bitFlags;
  93     }
  94 }