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

   1 /*
   2  * Copyright (c) 2013 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 com.google.common.base.Preconditions;
  11 import io.netty.buffer.ByteBuf;
  12 import io.netty.buffer.Unpooled;
  13 import org.opendaylight.protocol.bgp.parser.BGPDocumentedException;
  14 import org.opendaylight.protocol.bgp.parser.BGPParsingException;
  15 import org.opendaylight.protocol.bgp.parser.spi.AddressFamilyRegistry;
  16 import org.opendaylight.protocol.bgp.parser.spi.CapabilityParser;
  17 import org.opendaylight.protocol.bgp.parser.spi.CapabilitySerializer;
  18 import org.opendaylight.protocol.bgp.parser.spi.CapabilityUtil;
  19 import org.opendaylight.protocol.bgp.parser.spi.SubsequentAddressFamilyRegistry;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.bgp.parameters.optional.capabilities.CParameters;
  21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.open.bgp.parameters.optional.capabilities.c.parameters.MultiprotocolCase;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.open.bgp.parameters.optional.capabilities.c.parameters.MultiprotocolCaseBuilder;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.open.bgp.parameters.optional.capabilities.c.parameters.multiprotocol._case.MultiprotocolCapabilityBuilder;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.AddressFamily;
  25 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.SubsequentAddressFamily;
  26
  27 public final class MultiProtocolCapabilityHandler implements CapabilityParser, CapabilitySerializer {
  28     public static final int CODE = 1;
  29
  30     private final AddressFamilyRegistry afiReg;
  31     private final SubsequentAddressFamilyRegistry safiReg;
  32
  33     private static final int RESERVED = 1;
  34
  35     public MultiProtocolCapabilityHandler(final AddressFamilyRegistry afiReg, final SubsequentAddressFamilyRegistry safiReg) {
  36         this.afiReg = Preconditions.checkNotNull(afiReg);
  37         this.safiReg = Preconditions.checkNotNull(safiReg);
  38     }
  39
  40     @Override
  41     public MultiprotocolCase parseCapability(final ByteBuf buffer) throws BGPDocumentedException, BGPParsingException {
  42         final int afiVal = buffer.readUnsignedShort();
  43         final Class<? extends AddressFamily> afi = this.afiReg.classForFamily(afiVal);
  44         if (afi == null) {
  45             throw new BGPParsingException("Address Family Identifier: '" + afiVal + "' not supported.");
  46         }
  47         // skip reserved
  48         buffer.skipBytes(RESERVED);
  49         final int safiVal = buffer.readUnsignedByte();
  50         final Class<? extends SubsequentAddressFamily> safi = this.safiReg.classForFamily(safiVal);
  51         if (safi == null) {
  52             throw new BGPParsingException("Subsequent Address Family Identifier: '" + safiVal + "' not supported.");
  53         }
  54         return new MultiprotocolCaseBuilder().setMultiprotocolCapability(
  55             new MultiprotocolCapabilityBuilder().setAfi(afi).setSafi(safi).build()).build();
  56     }
  57
  58     @Override
  59     public void serializeCapability(final CParameters capability, final ByteBuf byteAggregator) {
  60         Preconditions.checkArgument(capability instanceof MultiprotocolCase);
  61         final MultiprotocolCase mp = (MultiprotocolCase) capability;
  62         final ByteBuf capBuffer = Unpooled.buffer();
  63         final Class<? extends AddressFamily> afi = mp.getMultiprotocolCapability().getAfi();
  64         final Integer afival = this.afiReg.numberForClass(afi);
  65         Preconditions.checkArgument(afival != null, "Unhandled address family " + afi);
  66         capBuffer.writeShort(afival);
  67
  68         final Class<? extends SubsequentAddressFamily> safi = mp.getMultiprotocolCapability().getSafi();
  69         final Integer safival = this.safiReg.numberForClass(safi);
  70         Preconditions.checkArgument(safival != null, "Unhandled subsequent address family " + safi);
  71         capBuffer.writeZero(RESERVED);
  72         capBuffer.writeByte(safival);
  73
  74         CapabilityUtil.formatCapability(CODE, capBuffer, byteAggregator);
  75     }
  76 }