bgp/parser-spi/src/main/java/org/opendaylight/protocol/bgp/parser/spi/MultiprotocolCapabilitiesUtil.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.spi;
   9
  10 import com.google.common.base.Preconditions;
  11 import io.netty.buffer.ByteBuf;
  12 import java.util.Optional;
  13 import org.opendaylight.protocol.bgp.parser.BgpTableTypeImpl;
  14 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev200120.open.message.bgp.parameters.optional.capabilities.CParameters;
  15 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev200120.open.message.bgp.parameters.optional.capabilities.CParametersBuilder;
  16 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.BgpTableType;
  17 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.CParameters1Builder;
  18 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.mp.capabilities.RouteRefreshCapabilityBuilder;
  19 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev200120.AddressFamily;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev200120.SubsequentAddressFamily;
  21 import org.slf4j.Logger;
  22 import org.slf4j.LoggerFactory;
  23
  24 public final class MultiprotocolCapabilitiesUtil {
  25     public static final CParameters RR_CAPABILITY = new CParametersBuilder()
  26             .addAugmentation(new CParameters1Builder()
  27                 .setRouteRefreshCapability(new RouteRefreshCapabilityBuilder().build())
  28                 .build())
  29             .build();
  30
  31     private static final Logger LOG = LoggerFactory.getLogger(MultiprotocolCapabilitiesUtil.class);
  32     private static final int RESERVED = 1;
  33
  34     private MultiprotocolCapabilitiesUtil() {
  35         // Hidden on purpose
  36     }
  37
  38     public static void serializeMPAfiSafi(final AddressFamilyRegistry afiReg,
  39             final SubsequentAddressFamilyRegistry safiReg, final AddressFamily afi, final SubsequentAddressFamily safi,
  40             final ByteBuf capBuffer) {
  41         final Integer afival = afiReg.numberForClass(afi);
  42         Preconditions.checkArgument(afival != null, "Unhandled address family " + afi);
  43         capBuffer.writeShort(afival);
  44
  45         capBuffer.writeZero(RESERVED);
  46
  47         final Integer safival = safiReg.numberForClass(safi);
  48         Preconditions.checkArgument(safival != null, "Unhandled subsequent address family " + safi);
  49         capBuffer.writeByte(safival);
  50     }
  51
  52     public static Optional<BgpTableType> parseMPAfiSafi(final ByteBuf buffer, final AddressFamilyRegistry afiReg,
  53             final SubsequentAddressFamilyRegistry safiReg) {
  54         final int afiVal = buffer.readUnsignedShort();
  55         final AddressFamily afi = afiReg.classForFamily(afiVal);
  56         if (afi == null) {
  57             LOG.info("Unsupported AFI {} parsed.", afiVal);
  58             return Optional.empty();
  59         }
  60         // skip reserved
  61         buffer.skipBytes(RESERVED);
  62         final int safiVal = buffer.readUnsignedByte();
  63         final SubsequentAddressFamily safi = safiReg.classForFamily(safiVal);
  64         if (safi == null) {
  65             LOG.info("Unsupported SAFI {} parsed.", safiVal);
  66             return Optional.empty();
  67         }
  68         return Optional.of(new BgpTableTypeImpl(afi, safi));
  69     }
  70 }