bgp/parser-impl/src/main/java/org/opendaylight/protocol/bgp/parser/impl/message/open/AddPathCapabilityHandler.java

   1 /*
   2  * Copyright (c) 2016 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.parser.impl.message.open;
   9
  10 import static java.util.Objects.requireNonNull;
  11
  12 import com.google.common.base.Preconditions;
  13 import io.netty.buffer.ByteBuf;
  14 import io.netty.buffer.Unpooled;
  15 import java.util.ArrayList;
  16 import java.util.List;
  17 import org.opendaylight.protocol.bgp.parser.BGPDocumentedException;
  18 import org.opendaylight.protocol.bgp.parser.BGPParsingException;
  19 import org.opendaylight.protocol.bgp.parser.spi.AddressFamilyRegistry;
  20 import org.opendaylight.protocol.bgp.parser.spi.CapabilityParser;
  21 import org.opendaylight.protocol.bgp.parser.spi.CapabilitySerializer;
  22 import org.opendaylight.protocol.bgp.parser.spi.CapabilityUtil;
  23 import org.opendaylight.protocol.bgp.parser.spi.SubsequentAddressFamilyRegistry;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev180329.open.message.bgp.parameters.optional.capabilities.CParameters;
  25 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev180329.open.message.bgp.parameters.optional.capabilities.CParametersBuilder;
  26 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.CParameters1;
  27 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.CParameters1Builder;
  28 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.SendReceive;
  29 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.mp.capabilities.AddPathCapability;
  30 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.mp.capabilities.AddPathCapabilityBuilder;
  31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.mp.capabilities.add.path.capability.AddressFamilies;
  32 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.mp.capabilities.add.path.capability.AddressFamiliesBuilder;
  33 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev180329.AddressFamily;
  34 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev180329.SubsequentAddressFamily;
  35
  36 public class AddPathCapabilityHandler implements CapabilityParser, CapabilitySerializer {
  37
  38     public static final int CODE = 69;
  39     private static final int TRIPLET_BYTE_SIZE = 4;
  40
  41     private final AddressFamilyRegistry afiReg;
  42     private final SubsequentAddressFamilyRegistry safiReg;
  43
  44     public AddPathCapabilityHandler(final AddressFamilyRegistry afiReg, final SubsequentAddressFamilyRegistry safiReg) {
  45         this.afiReg = requireNonNull(afiReg);
  46         this.safiReg = requireNonNull(safiReg);
  47     }
  48
  49     @Override
  50     public void serializeCapability(final CParameters capability, final ByteBuf byteAggregator) {
  51         final CParameters1 aug = capability.augmentation(CParameters1.class);
  52         if (aug == null) {
  53             return;
  54         }
  55         final AddPathCapability addPathCap = aug.getAddPathCapability();
  56         if (addPathCap == null) {
  57             return;
  58         }
  59
  60         final List<AddressFamilies> families = addPathCap.getAddressFamilies();
  61         if (families != null) {
  62             final ByteBuf capBuffer = Unpooled.buffer(families.size() * TRIPLET_BYTE_SIZE);
  63             for (final AddressFamilies addressFamily : families) {
  64                 final Class<? extends AddressFamily> afi = addressFamily.getAfi();
  65                 final Integer afival = this.afiReg.numberForClass(afi);
  66                 Preconditions.checkArgument(afival != null, "Unhandled address family " + afi);
  67                 capBuffer.writeShort(afival);
  68
  69                 final Class<? extends SubsequentAddressFamily> safi = addressFamily.getSafi();
  70                 final Integer safival = this.safiReg.numberForClass(safi);
  71                 Preconditions.checkArgument(safival != null, "Unhandled subsequent address family " + safi);
  72                 capBuffer.writeByte(safival);
  73
  74                 final SendReceive sendReceive = addressFamily.getSendReceive();
  75                 Preconditions.checkArgument(sendReceive != null, "Unhandled Send/Receive value");
  76                 capBuffer.writeByte(sendReceive.getIntValue());
  77             }
  78
  79             CapabilityUtil.formatCapability(CODE, capBuffer, byteAggregator);
  80         }
  81     }
  82
  83     @Override
  84     public CParameters parseCapability(final ByteBuf buffer) throws BGPDocumentedException, BGPParsingException {
  85         final List<AddressFamilies> families = new ArrayList<>();
  86         while (buffer.isReadable()) {
  87             final int afiVal = buffer.readUnsignedShort();
  88             final Class<? extends AddressFamily> afi = this.afiReg.classForFamily(afiVal);
  89             if (afi == null) {
  90                 throw new BGPParsingException("Address Family Identifier: '" + afiVal + "' not supported.");
  91             }
  92             final int safiVal = buffer.readUnsignedByte();
  93             final Class<? extends SubsequentAddressFamily> safi = this.safiReg.classForFamily(safiVal);
  94             if (safi == null) {
  95                 throw new BGPParsingException("Subsequent Address Family Identifier: '" + safiVal + "' not supported.");
  96             }
  97             final SendReceive sendReceive = SendReceive.forValue(buffer.readUnsignedByte());
  98             if (sendReceive != null) {
  99                 families.add(new AddressFamiliesBuilder().setAfi(afi).setSafi(safi).setSendReceive(sendReceive)
 100                     .build());
 101             }
 102         }
 103         return new CParametersBuilder().addAugmentation(CParameters1.class,new CParameters1Builder()
 104             .setAddPathCapability(new AddPathCapabilityBuilder().setAddressFamilies(families).build()).build()).build();
 105     }
 106
 107 }