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 io.netty.buffer.ByteBuf;
  11
  12 import org.opendaylight.protocol.bgp.parser.BGPDocumentedException;
  13 import org.opendaylight.protocol.bgp.parser.BGPParsingException;
  14 import org.opendaylight.protocol.bgp.parser.spi.AddressFamilyRegistry;
  15 import org.opendaylight.protocol.bgp.parser.spi.CapabilityParser;
  16 import org.opendaylight.protocol.bgp.parser.spi.CapabilitySerializer;
  17 import org.opendaylight.protocol.bgp.parser.spi.CapabilityUtil;
  18 import org.opendaylight.protocol.bgp.parser.spi.SubsequentAddressFamilyRegistry;
  19 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.bgp.parameters.CParameters;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.open.bgp.parameters.c.parameters.MultiprotocolCase;
  21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.open.bgp.parameters.c.parameters.MultiprotocolCaseBuilder;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.open.bgp.parameters.c.parameters.multiprotocol._case.MultiprotocolCapabilityBuilder;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.AddressFamily;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.SubsequentAddressFamily;
  25
  26 import com.google.common.base.Preconditions;
  27 import com.google.common.primitives.UnsignedBytes;
  28
  29 public final class MultiProtocolCapabilityHandler implements CapabilityParser, CapabilitySerializer {
  30         public static final int CODE = 1;
  31
  32         private final AddressFamilyRegistry afiReg;
  33         private final SubsequentAddressFamilyRegistry safiReg;
  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(1);
  49                 final int safiVal = UnsignedBytes.toInt(buffer.readByte());
  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 byte[] serializeCapability(final CParameters capability) {
  60                 final MultiprotocolCase mp = (MultiprotocolCase) capability;
  61
  62                 final Class<? extends AddressFamily> afi = mp.getMultiprotocolCapability().getAfi();
  63                 final Integer afival = this.afiReg.numberForClass(afi);
  64                 Preconditions.checkArgument(afival != null, "Unhandled address family " + afi);
  65
  66                 final Class<? extends SubsequentAddressFamily> safi = mp.getMultiprotocolCapability().getSafi();
  67                 final Integer safival = this.safiReg.numberForClass(safi);
  68                 Preconditions.checkArgument(safival != null, "Unhandled subsequent address family " + safi);
  69
  70                 return CapabilityUtil.formatCapability(
  71                                 CODE,
  72                                 new byte[] { UnsignedBytes.checkedCast(afival / 256), UnsignedBytes.checkedCast(afival % 256), 0,
  73                                                 UnsignedBytes.checkedCast(safival) });
  74         }
  75 }