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

   1 /*
   2  * Copyright (c) 2018 AT&T Intellectual Property. 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 static com.google.common.base.Preconditions.checkArgument;
  11 import static java.util.Objects.requireNonNull;
  12
  13 import io.netty.buffer.ByteBuf;
  14 import io.netty.buffer.Unpooled;
  15 import java.util.ArrayList;
  16 import java.util.List;
  17 import org.opendaylight.protocol.bgp.parser.spi.AddressFamilyRegistry;
  18 import org.opendaylight.protocol.bgp.parser.spi.CapabilityParser;
  19 import org.opendaylight.protocol.bgp.parser.spi.CapabilitySerializer;
  20 import org.opendaylight.protocol.bgp.parser.spi.CapabilityUtil;
  21 import org.opendaylight.protocol.bgp.parser.spi.SubsequentAddressFamilyRegistry;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev180329.open.message.bgp.parameters.optional.capabilities.CParameters;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev180329.open.message.bgp.parameters.optional.capabilities.CParametersBuilder;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.CParameters1;
  25 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.CParameters1Builder;
  26 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.mp.capabilities.LlGracefulRestartCapability;
  27 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.mp.capabilities.LlGracefulRestartCapabilityBuilder;
  28 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.mp.capabilities.ll.graceful.restart.capability.Tables;
  29 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.mp.capabilities.ll.graceful.restart.capability.TablesBuilder;
  30 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev180329.AddressFamily;
  31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev180329.SubsequentAddressFamily;
  32 import org.slf4j.Logger;
  33 import org.slf4j.LoggerFactory;
  34
  35 public final class LlGracefulCapabilityHandler implements CapabilityParser, CapabilitySerializer {
  36     public static final int CODE = 71;
  37
  38     private static final Logger LOG = LoggerFactory.getLogger(LlGracefulCapabilityHandler.class);
  39
  40     // size of AFI (16 bits) and SAFI (8bits) fields in bytes
  41     private static final int AFI_SAFI_SIZE = 3;
  42
  43     private static final int AFI_FLAGS_SIZE = 1;
  44     private static final int STALE_TIME_SIZE = 3;
  45
  46     private static final int PER_TABLE_SIZE = AFI_SAFI_SIZE + AFI_FLAGS_SIZE + STALE_TIME_SIZE;
  47
  48     private static final int MAX_STALE_TIME = 16777215;
  49     private static final byte AFI_FLAG_FORWARDING_STATE = (byte) 0x80;
  50
  51     private final AddressFamilyRegistry afiReg;
  52     private final SubsequentAddressFamilyRegistry safiReg;
  53
  54     public LlGracefulCapabilityHandler(final AddressFamilyRegistry afiReg,
  55                                        final SubsequentAddressFamilyRegistry safiReg) {
  56         this.afiReg = requireNonNull(afiReg);
  57         this.safiReg = requireNonNull(safiReg);
  58     }
  59
  60     @Override
  61     public CParameters parseCapability(final ByteBuf buffer) {
  62         final List<Tables> tables = new ArrayList<>();
  63
  64         while (buffer.isReadable()) {
  65             final short afival = buffer.readShort();
  66             final Class<? extends AddressFamily> afi = this.afiReg.classForFamily(afival);
  67             if (afi == null) {
  68                 LOG.debug("Ignoring GR capability for unknown address family {}", afival);
  69                 buffer.skipBytes(PER_TABLE_SIZE - 2);
  70                 continue;
  71             }
  72
  73             final byte safival = buffer.readByte();
  74             final Class<? extends SubsequentAddressFamily> safi = this.safiReg.classForFamily(safival);
  75             if (safi == null) {
  76                 LOG.debug("Ignoring GR capability for unknown subsequent address family {}", safival);
  77                 buffer.skipBytes(1);
  78                 continue;
  79             }
  80
  81             final byte afiFlags = buffer.readByte();
  82             final int staleTime = buffer.readUnsignedMedium();
  83             final Tables table = new TablesBuilder()
  84                     .setAfi(afi)
  85                     .setSafi(safi)
  86                     .setAfiFlags(new Tables.AfiFlags(Boolean.valueOf(afiFlags == AFI_FLAG_FORWARDING_STATE)))
  87                     .setLongLivedStaleTime(Long.valueOf(staleTime))
  88                     .build();
  89             tables.add(table);
  90         }
  91         return new CParametersBuilder()
  92                 .addAugmentation(CParameters1.class, new CParameters1Builder()
  93                         .setLlGracefulRestartCapability(new LlGracefulRestartCapabilityBuilder()
  94                                 .setTables(tables)
  95                                 .build())
  96                         .build())
  97                 .build();
  98     }
  99
 100     @Override
 101     public void serializeCapability(final CParameters capability, final ByteBuf byteAggregator) {
 102         final CParameters1 aug = capability.augmentation(CParameters1.class);
 103         if (aug != null) {
 104             final LlGracefulRestartCapability cap = aug.getLlGracefulRestartCapability();
 105             if (cap != null) {
 106                 CapabilityUtil.formatCapability(CODE, serializeCapability(cap), byteAggregator);
 107             }
 108         }
 109     }
 110
 111     private ByteBuf serializeCapability(final LlGracefulRestartCapability cap) {
 112         final List<Tables> tables = cap.getTables();
 113         if (tables == null || tables.isEmpty()) {
 114             return Unpooled.EMPTY_BUFFER;
 115         }
 116
 117         final ByteBuf buffer = Unpooled.buffer(PER_TABLE_SIZE * tables.size());
 118         for (Tables table : tables) {
 119             final Class<? extends AddressFamily> afi = table.getAfi();
 120             final Class<? extends SubsequentAddressFamily> safi = table.getSafi();
 121             final Integer afival = this.afiReg.numberForClass(afi);
 122             checkArgument(afival != null, "Unhandled address family %s", afi);
 123             buffer.writeShort(afival);
 124             final Integer safival = this.safiReg.numberForClass(safi);
 125             checkArgument(safival != null, "Unhandled subsequent address family %s", safi);
 126             buffer.writeByte(safival);
 127             if (table.getAfiFlags() != null && table.getAfiFlags().isForwardingState()) {
 128                 buffer.writeByte(AFI_FLAG_FORWARDING_STATE);
 129             } else {
 130                 buffer.writeZero(1);
 131             }
 132             final Long staleTime = table.getLongLivedStaleTime();
 133             final int timeval = staleTime != null ? staleTime.intValue() : 0;
 134             checkArgument(timeval >= 0 && timeval <= MAX_STALE_TIME, "Restart time is %s", staleTime);
 135             buffer.writeMedium(timeval);
 136         }
 137         return buffer;
 138     }
 139 }