bgp/extensions/linkstate/src/main/java/org/opendaylight/protocol/bgp/linkstate/impl/attribute/sr/RangeTlvParser.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 static org.opendaylight.protocol.bgp.linkstate.impl.attribute.PrefixAttributesParser.BINDING_SID;
  11 import static org.opendaylight.protocol.bgp.linkstate.impl.attribute.sr.binding.sid.sub.tlvs.Ipv4PrefixSidParser.PREFIX_SID;
  12 import static org.opendaylight.protocol.bgp.linkstate.impl.attribute.sr.binding.sid.sub.tlvs.Ipv6PrefixSidParser.IPV6_PREFIX_SID;
  13 import static org.opendaylight.protocol.bgp.linkstate.impl.attribute.sr.binding.sid.sub.tlvs.SIDParser.SID_TYPE;
  14
  15 import io.netty.buffer.ByteBuf;
  16 import io.netty.buffer.Unpooled;
  17 import java.util.ArrayList;
  18 import java.util.List;
  19 import org.opendaylight.protocol.bgp.linkstate.impl.attribute.sr.SidLabelIndexParser.Size;
  20 import org.opendaylight.protocol.bgp.linkstate.spi.TlvUtil;
  21 import org.opendaylight.protocol.util.BitArray;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev180329.ProtocolId;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev180329.prefix.state.SrRange;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev180329.prefix.state.SrRangeBuilder;
  25 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.RangeSubTlv;
  26 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.range.sub.tlv.BindingSidTlvCase;
  27 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.range.sub.tlv.BindingSidTlvCaseBuilder;
  28 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.range.sub.tlv.Ipv6PrefixSidTlvCase;
  29 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.range.sub.tlv.Ipv6PrefixSidTlvCaseBuilder;
  30 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.range.sub.tlv.PrefixSidTlvCase;
  31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.range.sub.tlv.PrefixSidTlvCaseBuilder;
  32 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.range.sub.tlv.SidLabelTlvCase;
  33 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.range.sub.tlv.SidLabelTlvCaseBuilder;
  34 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.tlv.SubTlvs;
  35 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.tlv.SubTlvsBuilder;
  36 import org.slf4j.Logger;
  37 import org.slf4j.LoggerFactory;
  38
  39 public final class RangeTlvParser {
  40     private static final Logger LOG = LoggerFactory.getLogger(RangeTlvParser.class);
  41     /* Flags */
  42     private static final int FLAGS_SIZE = 8;
  43     private static final int INNER_AREA = 0;
  44     private static final int RESERVED = 1;
  45
  46     private RangeTlvParser() {
  47         throw new UnsupportedOperationException();
  48     }
  49
  50     public static SrRange parseSrRange(final ByteBuf buffer, final ProtocolId protocolId) {
  51         final BitArray flags = BitArray.valueOf(buffer, FLAGS_SIZE);
  52         final SrRangeBuilder range = new SrRangeBuilder();
  53         if (protocolId.equals(ProtocolId.Ospf)) {
  54             range.setInterArea(flags.get(INNER_AREA));
  55         } else {
  56             range.setInterArea(Boolean.FALSE);
  57         }
  58         buffer.skipBytes(RESERVED);
  59         range.setRangeSize(buffer.readUnsignedShort());
  60         range.setSubTlvs(parseRangeSubTlvs(buffer, protocolId));
  61         return range.build();
  62     }
  63
  64     private static List<SubTlvs> parseRangeSubTlvs(final ByteBuf buffer, final ProtocolId protocolId) {
  65         final List<SubTlvs> subTlvs = new ArrayList<>();
  66         while (buffer.isReadable()) {
  67             final SubTlvsBuilder subTlv = new SubTlvsBuilder();
  68             final RangeSubTlv subTlvCase;
  69             final int type = buffer.readUnsignedShort();
  70             final int length = buffer.readUnsignedShort();
  71             switch (type) {
  72             case PREFIX_SID:
  73                 subTlvCase = new PrefixSidTlvCaseBuilder(SrPrefixAttributesParser.parseSrPrefix(buffer.readSlice(length), protocolId)).build();
  74                 break;
  75             case IPV6_PREFIX_SID:
  76                 subTlvCase = new Ipv6PrefixSidTlvCaseBuilder(Ipv6SrPrefixAttributesParser.parseSrIpv6Prefix(buffer.readSlice(length))).build();
  77                 break;
  78             case BINDING_SID:
  79                 subTlvCase = new BindingSidTlvCaseBuilder(BindingSidLabelParser.parseBindingSidLabel(buffer.readSlice(length), protocolId)).build();
  80                 break;
  81             case SID_TYPE:
  82                 subTlvCase = new SidLabelTlvCaseBuilder().setSidLabelIndex(SidLabelIndexParser.parseSidLabelIndex(Size.forValue(length), buffer.readSlice(length))).build();
  83                 break;
  84             default:
  85                 LOG.info("Unknown type of range sub-tlv: {}", type);
  86                 buffer.skipBytes(length);
  87                 continue;
  88             }
  89             subTlvs.add(subTlv.setRangeSubTlv(subTlvCase).build());
  90         }
  91         return subTlvs;
  92     }
  93
  94     public static void serializeSrRange(final SrRange srRange, final ByteBuf aggregator) {
  95         final BitArray flags = new BitArray(FLAGS_SIZE);
  96         flags.set(INNER_AREA, srRange.isInterArea());
  97         flags.toByteBuf(aggregator);
  98         aggregator.writeZero(RESERVED);
  99         aggregator.writeShort(srRange.getRangeSize());
 100         serializeSubTlvs(aggregator, srRange.getSubTlvs());
 101     }
 102
 103     private static void serializeSubTlvs(final ByteBuf aggregator, final List<SubTlvs> subTlvs) {
 104         for (final SubTlvs subTlv : subTlvs) {
 105             ByteBuf buffer = Unpooled.buffer();
 106             final RangeSubTlv rangeSubTlv = subTlv.getRangeSubTlv();
 107             if (rangeSubTlv instanceof PrefixSidTlvCase) {
 108                 final PrefixSidTlvCase prefixSidTlv = (PrefixSidTlvCase) rangeSubTlv;
 109                 SrPrefixAttributesParser.serializePrefixAttributes(
 110                     prefixSidTlv.getFlags(),
 111                     prefixSidTlv.getAlgorithm(),
 112                     prefixSidTlv.getSidLabelIndex(),
 113                     buffer);
 114                 TlvUtil.writeTLV(PREFIX_SID, buffer, aggregator);
 115             } else if (rangeSubTlv instanceof Ipv6PrefixSidTlvCase) {
 116                 final Ipv6PrefixSidTlvCase prefixSidTlv = (Ipv6PrefixSidTlvCase) rangeSubTlv;
 117                 Ipv6SrPrefixAttributesParser.serializePrefixAttributes(prefixSidTlv.getAlgorithm(), buffer);
 118                 TlvUtil.writeTLV(IPV6_PREFIX_SID, buffer, aggregator);
 119             } else if (rangeSubTlv instanceof BindingSidTlvCase) {
 120                 final BindingSidTlvCase rangeTlv = (BindingSidTlvCase) rangeSubTlv;
 121                 BindingSidLabelParser.serializeBindingSidAttributes(
 122                     rangeTlv.getWeight(),
 123                     rangeTlv.getFlags(),
 124                     rangeTlv.getBindingSubTlvs(),
 125                     buffer);
 126                 TlvUtil.writeTLV(BINDING_SID, buffer, aggregator);
 127             } else if (rangeSubTlv instanceof SidLabelTlvCase) {
 128                 buffer = SidLabelIndexParser.serializeSidValue(((SidLabelTlvCase) rangeSubTlv).getSidLabelIndex());
 129                 TlvUtil.writeTLV(SID_TYPE, buffer, aggregator);
 130             }
 131         }
 132     }
 133
 134 }