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.CParameters1;
  18 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.CParameters1Builder;
  19 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.mp.capabilities.RouteRefreshCapabilityBuilder;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev200120.AddressFamily;
  21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev200120.SubsequentAddressFamily;
  22 import org.slf4j.Logger;
  23 import org.slf4j.LoggerFactory;
  24
  25 public final class MultiprotocolCapabilitiesUtil {
  26     public static final CParameters RR_CAPABILITY = new CParametersBuilder().addAugmentation(CParameters1.class,
  27         new CParameters1Builder().setRouteRefreshCapability(new RouteRefreshCapabilityBuilder().build()).build())
  28             .build();
  29
  30     private static final Logger LOG = LoggerFactory.getLogger(MultiprotocolCapabilitiesUtil.class);
  31     private static final int RESERVED = 1;
  32
  33     private MultiprotocolCapabilitiesUtil() {
  34         // Hidden on purpose
  35     }
  36
  37     public static void serializeMPAfiSafi(final AddressFamilyRegistry afiReg,
  38             final SubsequentAddressFamilyRegistry safiReg, final Class<? extends AddressFamily> afi,
  39             final Class<? extends SubsequentAddressFamily> safi, final ByteBuf capBuffer) {
  40         final Integer afival = afiReg.numberForClass(afi);
  41         Preconditions.checkArgument(afival != null, "Unhandled address family " + afi);
  42         capBuffer.writeShort(afival);
  43
  44         capBuffer.writeZero(RESERVED);
  45
  46         final Integer safival = safiReg.numberForClass(safi);
  47         Preconditions.checkArgument(safival != null, "Unhandled subsequent address family " + safi);
  48         capBuffer.writeByte(safival);
  49     }
  50
  51     public static Optional<BgpTableType> parseMPAfiSafi(final ByteBuf buffer, final AddressFamilyRegistry afiReg,
  52             final SubsequentAddressFamilyRegistry safiReg) {
  53         final int afiVal = buffer.readUnsignedShort();
  54         final Class<? extends AddressFamily> afi = afiReg.classForFamily(afiVal);
  55         if (afi == null) {
  56             LOG.info("Unsupported AFI {} parsed.", afiVal);
  57             return Optional.empty();
  58         }
  59         // skip reserved
  60         buffer.skipBytes(RESERVED);
  61         final int safiVal = buffer.readUnsignedByte();
  62         final Class<? extends SubsequentAddressFamily> safi = safiReg.classForFamily(safiVal);
  63         if (safi == null) {
  64             LOG.info("Unsupported SAFI {} parsed.", safiVal);
  65             return Optional.empty();
  66         }
  67         return Optional.of(new BgpTableTypeImpl(afi, safi));
  68     }
  69 }