2 * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
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
8 package org.opendaylight.protocol.bgp.parser.impl.message.open;
10 import static java.util.Objects.requireNonNull;
12 import com.google.common.base.Preconditions;
13 import io.netty.buffer.ByteBuf;
14 import io.netty.buffer.Unpooled;
15 import java.util.ArrayList;
16 import java.util.List;
18 import org.opendaylight.protocol.bgp.parser.BGPDocumentedException;
19 import org.opendaylight.protocol.bgp.parser.BGPParsingException;
20 import org.opendaylight.protocol.bgp.parser.spi.AddressFamilyRegistry;
21 import org.opendaylight.protocol.bgp.parser.spi.CapabilityParser;
22 import org.opendaylight.protocol.bgp.parser.spi.CapabilitySerializer;
23 import org.opendaylight.protocol.bgp.parser.spi.CapabilityUtil;
24 import org.opendaylight.protocol.bgp.parser.spi.SubsequentAddressFamilyRegistry;
25 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev200120.open.message.bgp.parameters.optional.capabilities.CParameters;
26 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev200120.open.message.bgp.parameters.optional.capabilities.CParametersBuilder;
27 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.CParameters1;
28 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.CParameters1Builder;
29 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.mp.capabilities.GracefulRestartCapability;
30 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.mp.capabilities.GracefulRestartCapability.RestartFlags;
31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.mp.capabilities.GracefulRestartCapabilityBuilder;
32 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.mp.capabilities.graceful.restart.capability.Tables;
33 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.mp.capabilities.graceful.restart.capability.Tables.AfiFlags;
34 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.mp.capabilities.graceful.restart.capability.TablesBuilder;
35 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.mp.capabilities.graceful.restart.capability.TablesKey;
36 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev200120.AddressFamily;
37 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev200120.SubsequentAddressFamily;
38 import org.opendaylight.yangtools.yang.common.Uint16;
39 import org.slf4j.Logger;
40 import org.slf4j.LoggerFactory;
42 public final class GracefulCapabilityHandler implements CapabilityParser, CapabilitySerializer {
43 public static final int CODE = 64;
45 private static final Logger LOG = LoggerFactory.getLogger(GracefulCapabilityHandler.class);
47 // Restart flag size, in bits
48 private static final int RESTART_FLAGS_SIZE = 4;
49 private static final int RESTART_FLAG_STATE = 0x8000;
51 // Restart timer size, in bits
52 private static final int TIMER_SIZE = 12;
53 private static final int TIMER_TOPBITS_MASK = 0x0F;
55 // Size of the capability header
56 private static final int HEADER_SIZE = (RESTART_FLAGS_SIZE + TIMER_SIZE) / Byte.SIZE;
58 // Length of each AFI/SAFI array member, in bytes
59 private static final int PER_AFI_SAFI_SIZE = 4;
61 private static final short AFI_FLAG_FORWARDING_STATE = 0x80;
63 private static final int MAX_RESTART_TIME = 4095;
65 private final AddressFamilyRegistry afiReg;
66 private final SubsequentAddressFamilyRegistry safiReg;
68 public GracefulCapabilityHandler(final AddressFamilyRegistry afiReg,
69 final SubsequentAddressFamilyRegistry safiReg) {
70 this.afiReg = requireNonNull(afiReg);
71 this.safiReg = requireNonNull(safiReg);
74 private void serializeTables(final Map<TablesKey, Tables> tables, final ByteBuf bytes) {
78 for (final Tables t : tables.values()) {
79 final Class<? extends AddressFamily> afi = t.getAfi();
80 final Integer afival = this.afiReg.numberForClass(afi);
81 Preconditions.checkArgument(afival != null, "Unhandled address family " + afi);
82 bytes.writeShort(afival);
83 final Class<? extends SubsequentAddressFamily> safi = t.getSafi();
84 final Integer safival = this.safiReg.numberForClass(safi);
85 Preconditions.checkArgument(safival != null, "Unhandled subsequent address family " + safi);
86 bytes.writeByte(safival);
87 if (t.getAfiFlags() != null && t.getAfiFlags().isForwardingState()) {
88 bytes.writeByte(AFI_FLAG_FORWARDING_STATE);
95 private ByteBuf serializeCapability(final GracefulRestartCapability grace) {
96 final Map<TablesKey, Tables> tables = grace.getTables();
97 final int tablesSize = tables != null ? tables.size() : 0;
98 final ByteBuf bytes = Unpooled.buffer(HEADER_SIZE + PER_AFI_SAFI_SIZE * tablesSize);
99 Uint16 time = grace.getRestartTime();
103 final int timeval = time.toJava();
104 Preconditions.checkArgument(timeval >= 0 && timeval <= MAX_RESTART_TIME, "Restart time is " + time);
105 final GracefulRestartCapability.RestartFlags flags = grace.getRestartFlags();
106 if (flags != null && flags.isRestartState()) {
107 bytes.writeShort(RESTART_FLAG_STATE | timeval);
109 bytes.writeShort(timeval);
111 serializeTables(tables, bytes);
116 public void serializeCapability(final CParameters capability, final ByteBuf byteAggregator) {
117 final CParameters1 aug = capability.augmentation(CParameters1.class);
121 final GracefulRestartCapability grace = aug.getGracefulRestartCapability();
123 final ByteBuf bytes = serializeCapability(grace);
124 CapabilityUtil.formatCapability(CODE, bytes, byteAggregator);
129 public CParameters parseCapability(final ByteBuf buffer) throws BGPDocumentedException, BGPParsingException {
130 final GracefulRestartCapabilityBuilder cb = new GracefulRestartCapabilityBuilder();
132 final int flagBits = buffer.getByte(0) >> RESTART_FLAGS_SIZE;
133 cb.setRestartFlags(new RestartFlags((flagBits & Byte.SIZE) != 0));
135 final int timer = ((buffer.readUnsignedByte() & TIMER_TOPBITS_MASK) << Byte.SIZE) + buffer.readUnsignedByte();
136 cb.setRestartTime(Uint16.valueOf(timer));
138 final List<Tables> tables = new ArrayList<>();
139 while (buffer.readableBytes() != 0) {
140 final int afiVal = buffer.readShort();
141 final Class<? extends AddressFamily> afi = this.afiReg.classForFamily(afiVal);
143 LOG.debug("Ignoring GR capability for unknown address family {}", afiVal);
144 buffer.skipBytes(PER_AFI_SAFI_SIZE - 2);
147 final int safiVal = buffer.readUnsignedByte();
148 final Class<? extends SubsequentAddressFamily> safi = this.safiReg.classForFamily(safiVal);
150 LOG.debug("Ignoring GR capability for unknown subsequent address family {}", safiVal);
154 final int flags = buffer.readUnsignedByte();
155 tables.add(new TablesBuilder().setAfi(afi).setSafi(safi)
156 .setAfiFlags(new AfiFlags((flags & AFI_FLAG_FORWARDING_STATE) != 0)).build());
158 cb.setTables(tables);
159 return new CParametersBuilder().addAugmentation(CParameters1.class, new CParameters1Builder()
160 .setGracefulRestartCapability(cb.build()).build()).build();