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
  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(
  74                         SrPrefixAttributesParser.parseSrPrefix(buffer.readSlice(length), protocolId)).build();
  75                     break;
  76                 case IPV6_PREFIX_SID:
  77                     subTlvCase = new Ipv6PrefixSidTlvCaseBuilder(
  78                         Ipv6SrPrefixAttributesParser.parseSrIpv6Prefix(buffer.readSlice(length))).build();
  79                     break;
  80                 case BINDING_SID:
  81                     subTlvCase = new BindingSidTlvCaseBuilder(
  82                         BindingSidLabelParser.parseBindingSidLabel(buffer.readSlice(length), protocolId)).build();
  83                     break;
  84                 case SID_TYPE:
  85                     subTlvCase = new SidLabelTlvCaseBuilder().setSidLabelIndex(
  86                         SidLabelIndexParser.parseSidLabelIndex(Size.forValue(length), buffer.readSlice(length)))
  87                     .build();
  88                     break;
  89                 default:
  90                     LOG.info("Unknown type of range sub-tlv: {}", type);
  91                     buffer.skipBytes(length);
  92                     continue;
  93             }
  94             subTlvs.add(subTlv.setRangeSubTlv(subTlvCase).build());
  95         }
  96         return subTlvs;
  97     }
  98
  99     public static void serializeSrRange(final SrRange srRange, final ByteBuf aggregator) {
 100         final BitArray flags = new BitArray(FLAGS_SIZE);
 101         flags.set(INNER_AREA, srRange.isInterArea());
 102         flags.toByteBuf(aggregator);
 103         aggregator.writeZero(RESERVED);
 104         aggregator.writeShort(srRange.getRangeSize());
 105         serializeSubTlvs(aggregator, srRange.getSubTlvs());
 106     }
 107
 108     private static void serializeSubTlvs(final ByteBuf aggregator, final List<SubTlvs> subTlvs) {
 109         for (final SubTlvs subTlv : subTlvs) {
 110             ByteBuf buffer = Unpooled.buffer();
 111             final RangeSubTlv rangeSubTlv = subTlv.getRangeSubTlv();
 112             if (rangeSubTlv instanceof PrefixSidTlvCase) {
 113                 final PrefixSidTlvCase prefixSidTlv = (PrefixSidTlvCase) rangeSubTlv;
 114                 SrPrefixAttributesParser.serializePrefixAttributes(
 115                     prefixSidTlv.getFlags(),
 116                     prefixSidTlv.getAlgorithm(),
 117                     prefixSidTlv.getSidLabelIndex(),
 118                     buffer);
 119                 TlvUtil.writeTLV(PREFIX_SID, buffer, aggregator);
 120             } else if (rangeSubTlv instanceof Ipv6PrefixSidTlvCase) {
 121                 final Ipv6PrefixSidTlvCase prefixSidTlv = (Ipv6PrefixSidTlvCase) rangeSubTlv;
 122                 Ipv6SrPrefixAttributesParser.serializePrefixAttributes(prefixSidTlv.getAlgorithm(), buffer);
 123                 TlvUtil.writeTLV(IPV6_PREFIX_SID, buffer, aggregator);
 124             } else if (rangeSubTlv instanceof BindingSidTlvCase) {
 125                 final BindingSidTlvCase rangeTlv = (BindingSidTlvCase) rangeSubTlv;
 126                 BindingSidLabelParser.serializeBindingSidAttributes(
 127                     rangeTlv.getWeight(),
 128                     rangeTlv.getFlags(),
 129                     rangeTlv.getBindingSubTlvs(),
 130                     buffer);
 131                 TlvUtil.writeTLV(BINDING_SID, buffer, aggregator);
 132             } else if (rangeSubTlv instanceof SidLabelTlvCase) {
 133                 buffer = SidLabelIndexParser.serializeSidValue(((SidLabelTlvCase) rangeSubTlv).getSidLabelIndex());
 134                 TlvUtil.writeTLV(SID_TYPE, buffer, aggregator);
 135             }
 136         }
 137     }
 138
 139 }