*/
package org.opendaylight.protocol.bgp.parser.impl.message.open;
+import static java.util.Objects.requireNonNull;
+import static org.opendaylight.protocol.util.ByteBufWriteUtil.writeUnsignedShort;
+
+import com.google.common.base.Preconditions;
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
+import java.util.ArrayList;
+import java.util.List;
+import org.opendaylight.protocol.bgp.parser.BGPDocumentedException;
+import org.opendaylight.protocol.bgp.parser.BGPParsingException;
+import org.opendaylight.protocol.bgp.parser.spi.AddressFamilyRegistry;
+import org.opendaylight.protocol.bgp.parser.spi.CapabilityParser;
import org.opendaylight.protocol.bgp.parser.spi.CapabilitySerializer;
import org.opendaylight.protocol.bgp.parser.spi.CapabilityUtil;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.bgp.parameters.CParameters;
-
-final class GracefulCapabilityHandler implements CapabilitySerializer {
- static final int CODE = 64;
-
- private static final int RESTART_FLAGS_SIZE = 4; // bits
- private static final int TIMER_SIZE = 12; // bits
- private static final int AFI_SIZE = 2; // bytes
- private static final int SAFI_SIZE = 1; // bytes
- private static final int AF_FLAGS_SIZE = 1; // bytes
-
- @Override
- public byte[] serializeCapability(final CParameters capability) {
- final byte[] bytes = null;
-
- // final GracefulCapability param = (GracefulCapability) capability;
- // final byte[] bytes = new byte[(RESTART_FLAGS_SIZE + TIMER_SIZE + (AFI_SIZE * Byte.SIZE + SAFI_SIZE *
- // Byte.SIZE +
- // AF_FLAGS_SIZE
- // * Byte.SIZE)
- // * param.getTableTypes().size())
- // / Byte.SIZE];
- // if (param.isRestartFlag()) {
- // bytes[0] = (byte) 0x80;
- // }
- // int index = (RESTART_FLAGS_SIZE + TIMER_SIZE) / Byte.SIZE;
- // for (final Entry<BGPTableType, Boolean> entry : param.getTableTypes().entrySet()) {
- // final byte[] a = putAfi(entry.getKey().getAddressFamily());
- // final byte s = putSafi(entry.getKey().getSubsequentAddressFamily());
- // final byte f = (entry.getValue()) ? (byte) 0x80 : (byte) 0x00;
- // System.arraycopy(a, 0, bytes, index, AFI_SIZE);
- // index += AFI_SIZE;
- // bytes[index] = s;
- // index += SAFI_SIZE;
- // bytes[index] = f;
- // index += AF_FLAGS_SIZE;
- // }
-
- return CapabilityUtil.formatCapability(CODE, bytes);
- }
+import org.opendaylight.protocol.bgp.parser.spi.SubsequentAddressFamilyRegistry;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev171207.open.message.bgp.parameters.optional.capabilities.CParameters;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev171207.open.message.bgp.parameters.optional.capabilities.CParametersBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.CParameters1;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.CParameters1Builder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.mp.capabilities.GracefulRestartCapability;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.mp.capabilities.GracefulRestartCapability.RestartFlags;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.mp.capabilities.GracefulRestartCapabilityBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.mp.capabilities.graceful.restart.capability.Tables;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.mp.capabilities.graceful.restart.capability.Tables.AfiFlags;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.mp.capabilities.graceful.restart.capability.TablesBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.AddressFamily;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.SubsequentAddressFamily;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public final class GracefulCapabilityHandler implements CapabilityParser, CapabilitySerializer {
+ public static final int CODE = 64;
+
+ private static final Logger LOG = LoggerFactory.getLogger(GracefulCapabilityHandler.class);
+
+ // Restart flag size, in bits
+ private static final int RESTART_FLAGS_SIZE = 4;
+ private static final int RESTART_FLAG_STATE = 0x8000;
+
+ // Restart timer size, in bits
+ private static final int TIMER_SIZE = 12;
+ private static final int TIMER_TOPBITS_MASK = 0x0F;
+
+ // Size of the capability header
+ private static final int HEADER_SIZE = (RESTART_FLAGS_SIZE + TIMER_SIZE) / Byte.SIZE;
+
+ // Length of each AFI/SAFI array member, in bytes
+ private static final int PER_AFI_SAFI_SIZE = 4;
+
+ private static final short AFI_FLAG_FORWARDING_STATE = 0x80;
+
+ private static final int MAX_RESTART_TIME = 4095;
+
+ private final AddressFamilyRegistry afiReg;
+ private final SubsequentAddressFamilyRegistry safiReg;
+
+ public GracefulCapabilityHandler(final AddressFamilyRegistry afiReg, final SubsequentAddressFamilyRegistry safiReg) {
+ this.afiReg = requireNonNull(afiReg);
+ this.safiReg = requireNonNull(safiReg);
+ }
+
+ private void serializeTables(final List<Tables> tables, final ByteBuf bytes) {
+ if (tables == null) {
+ return;
+ }
+ for (final Tables t : tables) {
+ final Class<? extends AddressFamily> afi = t.getAfi();
+ final Integer afival = this.afiReg.numberForClass(afi);
+ Preconditions.checkArgument(afival != null, "Unhandled address family " + afi);
+ bytes.writeShort(afival);
+ final Class<? extends SubsequentAddressFamily> safi = t.getSafi();
+ final Integer safival = this.safiReg.numberForClass(safi);
+ Preconditions.checkArgument(safival != null, "Unhandled subsequent address family " + safi);
+ bytes.writeByte(safival);
+ if (t.getAfiFlags() != null && t.getAfiFlags().isForwardingState()) {
+ bytes.writeByte(AFI_FLAG_FORWARDING_STATE);
+ } else {
+ bytes.writeZero(1);
+ }
+ }
+ }
+
+ private ByteBuf serializeCapability(final GracefulRestartCapability grace) {
+ final List<Tables> tables = grace.getTables();
+ final int tablesSize = (tables != null) ? tables.size() : 0;
+ final ByteBuf bytes = Unpooled.buffer(HEADER_SIZE + (PER_AFI_SAFI_SIZE * tablesSize));
+ int timeval = 0;
+ Integer time = grace.getRestartTime();
+ if (time == null) {
+ time = 0;
+ }
+ Preconditions.checkArgument(time >= 0 && time <= MAX_RESTART_TIME, "Restart time is " + time);
+ timeval = time;
+ final GracefulRestartCapability.RestartFlags flags = grace.getRestartFlags();
+ if (flags != null && flags.isRestartState()) {
+ writeUnsignedShort(RESTART_FLAG_STATE | timeval, bytes);
+ } else {
+ writeUnsignedShort(timeval, bytes);
+ }
+ serializeTables(tables, bytes);
+ return bytes;
+ }
+
+ @Override
+ public void serializeCapability(final CParameters capability, final ByteBuf byteAggregator) {
+ if (capability.getAugmentation(CParameters1.class) == null
+ || capability.getAugmentation(CParameters1.class).getGracefulRestartCapability() == null) {
+ return;
+ }
+ final GracefulRestartCapability grace = capability.getAugmentation(CParameters1.class).getGracefulRestartCapability();
+
+ final ByteBuf bytes = serializeCapability(grace);
+
+ CapabilityUtil.formatCapability(CODE, bytes, byteAggregator);
+ }
+
+ @Override
+ public CParameters parseCapability(final ByteBuf buffer) throws BGPDocumentedException, BGPParsingException {
+ final GracefulRestartCapabilityBuilder cb = new GracefulRestartCapabilityBuilder();
+
+ final int flagBits = (buffer.getByte(0) >> RESTART_FLAGS_SIZE);
+ cb.setRestartFlags(new RestartFlags((flagBits & Byte.SIZE) != 0));
+
+ final int timer = ((buffer.readUnsignedByte() & TIMER_TOPBITS_MASK) << Byte.SIZE) + buffer.readUnsignedByte();
+ cb.setRestartTime(timer);
+ final List<Tables> tables = new ArrayList<>();
+ while (buffer.readableBytes() != 0) {
+ final int afiVal = buffer.readShort();
+ final Class<? extends AddressFamily> afi = this.afiReg.classForFamily(afiVal);
+ if (afi == null) {
+ LOG.debug("Ignoring GR capability for unknown address family {}", afiVal);
+ buffer.skipBytes(PER_AFI_SAFI_SIZE - 2);
+ continue;
+ }
+ final int safiVal = buffer.readUnsignedByte();
+ final Class<? extends SubsequentAddressFamily> safi = this.safiReg.classForFamily(safiVal);
+ if (safi == null) {
+ LOG.debug("Ignoring GR capability for unknown subsequent address family {}", safiVal);
+ buffer.skipBytes(1);
+ continue;
+ }
+ final int flags = buffer.readUnsignedByte();
+ tables.add(new TablesBuilder().setAfi(afi).setSafi(safi).setAfiFlags(new AfiFlags((flags & AFI_FLAG_FORWARDING_STATE) != 0)).build());
+ }
+ cb.setTables(tables);
+ return new CParametersBuilder().addAugmentation(CParameters1.class, new CParameters1Builder()
+ .setGracefulRestartCapability(cb.build()).build()).build();
+ }
}
Code Review / bgpcep.git / blobdiff