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.rev171207.open.message.bgp.parameters.optional.capabilities.CParameters;
  15 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev171207.open.message.bgp.parameters.optional.capabilities.CParametersBuilder;
  16 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.BgpTableType;
  17 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.CParameters1;
  18 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.CParameters1Builder;
  19 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.mp.capabilities.RouteRefreshCapabilityBuilder;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.AddressFamily;
  21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.SubsequentAddressFamily;
  22 import org.slf4j.Logger;
  23 import org.slf4j.LoggerFactory;
  24
  25 public final class MultiprotocolCapabilitiesUtil {
  26
  27     private static final Logger LOG = LoggerFactory.getLogger(MultiprotocolCapabilitiesUtil.class);
  28
  29     public static final CParameters RR_CAPABILITY = new CParametersBuilder().addAugmentation(CParameters1.class,
  30         new CParameters1Builder().setRouteRefreshCapability(new RouteRefreshCapabilityBuilder().build()).build()).build();
  31
  32     private static final int RESERVED = 1;
  33
  34     private MultiprotocolCapabilitiesUtil() { throw new UnsupportedOperationException(); }
  35
  36     public static void serializeMPAfiSafi(final AddressFamilyRegistry afiReg, final SubsequentAddressFamilyRegistry safiReg,
  37         final Class<? extends AddressFamily> afi, final Class<? extends SubsequentAddressFamily> safi, final ByteBuf capBuffer) {
  38         final Integer afival = afiReg.numberForClass(afi);
  39         Preconditions.checkArgument(afival != null, "Unhandled address family " + afi);
  40         capBuffer.writeShort(afival);
  41
  42         capBuffer.writeZero(RESERVED);
  43
  44         final Integer safival = safiReg.numberForClass(safi);
  45         Preconditions.checkArgument(safival != null, "Unhandled subsequent address family " + safi);
  46         capBuffer.writeByte(safival);
  47     }
  48
  49     public static Optional<BgpTableType> parseMPAfiSafi(final ByteBuf buffer, final AddressFamilyRegistry afiReg, final SubsequentAddressFamilyRegistry safiReg) {
  50         final int afiVal = buffer.readUnsignedShort();
  51         final Class<? extends AddressFamily> afi = afiReg.classForFamily(afiVal);
  52         if (afi == null) {
  53             LOG.info("Unsupported AFI {} parsed.", afiVal);
  54             return Optional.empty();
  55         }
  56         // skip reserved
  57         buffer.skipBytes(RESERVED);
  58         final int safiVal = buffer.readUnsignedByte();
  59         final Class<? extends SubsequentAddressFamily> safi = safiReg.classForFamily(safiVal);
  60         if (safi == null) {
  61             LOG.info("Unsupported SAFI {} parsed.", safiVal);
  62             return Optional.empty();
  63         }
  64         return Optional.of(new BgpTableTypeImpl(afi, safi));
  65     }
  66 }