* terms of the Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*/
-
package org.opendaylight.protocol.bgp.parser.impl.message;
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.List;
-import java.util.Set;
-
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import org.opendaylight.protocol.bgp.concepts.BGPAddressFamily;
-import org.opendaylight.protocol.bgp.concepts.BGPSubsequentAddressFamily;
-import org.opendaylight.protocol.bgp.concepts.BGPTableType;
+import com.google.common.base.Preconditions;
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.ByteBufUtil;
+import io.netty.buffer.Unpooled;
+import java.util.List;
import org.opendaylight.protocol.bgp.parser.BGPDocumentedException;
import org.opendaylight.protocol.bgp.parser.BGPError;
-import org.opendaylight.protocol.bgp.parser.BGPMessageHeader;
import org.opendaylight.protocol.bgp.parser.BGPParsingException;
-import org.opendaylight.protocol.bgp.parser.BGPUpdateEvent;
-import org.opendaylight.protocol.bgp.parser.BGPUpdateSynchronized;
-import org.opendaylight.protocol.bgp.parser.impl.BGPUpdateEventBuilder;
-import org.opendaylight.protocol.bgp.parser.impl.IPv6MP;
-import org.opendaylight.protocol.bgp.parser.impl.PathAttribute;
-import org.opendaylight.protocol.bgp.parser.impl.PathAttribute.TypeCode;
-import org.opendaylight.protocol.bgp.parser.impl.message.update.PathAttributeParser;
+import org.opendaylight.protocol.bgp.parser.spi.AttributeRegistry;
+import org.opendaylight.protocol.bgp.parser.spi.MessageParser;
+import org.opendaylight.protocol.bgp.parser.spi.MessageSerializer;
+import org.opendaylight.protocol.bgp.parser.spi.MessageUtil;
import org.opendaylight.protocol.util.ByteArray;
-import org.opendaylight.protocol.concepts.IPv4;
-import org.opendaylight.protocol.concepts.IPv4Address;
-import org.opendaylight.protocol.concepts.Prefix;
-import com.google.common.collect.Lists;
+import org.opendaylight.protocol.util.Ipv4Util;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.Ipv4Prefix;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Update;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.UpdateBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.path.attributes.Attributes;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.update.Nlri;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.update.NlriBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.update.WithdrawnRoutes;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.update.WithdrawnRoutesBuilder;
+import org.opendaylight.yangtools.yang.binding.Notification;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
/**
* LENGTH fields, that denote the length of the fields with variable length, have fixed SIZE.
- *
+ *
* @see <a href="http://tools.ietf.org/html/rfc4271#section-4.3">BGP-4 Update Message Format</a>
- *
*/
-public class BGPUpdateMessageParser {
-
- private static Logger logger = LoggerFactory.getLogger(BGPUpdateMessageParser.class);
-
- /**
- * Size of the withdrawn_routes_length field, in bytes.
- */
- public static final int WITHDRAWN_ROUTES_LENGTH_SIZE = 2;
-
- /**
- * Size of the total_path_attr_length field, in bytes.
- */
- public static final int TOTAL_PATH_ATTR_LENGTH_SIZE = 2;
-
- // Constructors -------------------------------------------------------
-
- public BGPUpdateMessageParser() {
-
- }
-
- // Getters & setters --------------------------------------------------
-
- public static BGPUpdateEvent parse(final byte[] bytes, final int msgLength) throws BGPDocumentedException {
- if (bytes == null || bytes.length == 0)
- throw new IllegalArgumentException("Byte array cannot be null or empty.");
- logger.trace("Started parsing of update message: {}", Arrays.toString(bytes));
-
- int byteOffset = 0;
-
- final int withdrawnRoutesLength = ByteArray.bytesToInt(ByteArray.subByte(bytes, byteOffset, WITHDRAWN_ROUTES_LENGTH_SIZE));
- byteOffset += WITHDRAWN_ROUTES_LENGTH_SIZE;
-
- final BGPUpdateEventBuilder eventBuilder = new BGPUpdateEventBuilder();
- eventBuilder.setWithdrawnRoutesLength(withdrawnRoutesLength);
-
- Set<Prefix<IPv4Address>> withdrawnRoutes;
- if (withdrawnRoutesLength > 0) {
- withdrawnRoutes = IPv4.FAMILY.prefixListForBytes(ByteArray.subByte(bytes, byteOffset, withdrawnRoutesLength));
- byteOffset += withdrawnRoutesLength;
- } else {
- withdrawnRoutes = Collections.emptySet();
- }
- eventBuilder.setWithdrawnRoutes(withdrawnRoutes);
-
- final int totalPathAttrLength = ByteArray.bytesToInt(ByteArray.subByte(bytes, byteOffset, TOTAL_PATH_ATTR_LENGTH_SIZE));
- byteOffset += TOTAL_PATH_ATTR_LENGTH_SIZE;
- eventBuilder.setTotalPathAttrLength(totalPathAttrLength);
-
- if (withdrawnRoutesLength + totalPathAttrLength + BGPMessageHeader.COMMON_HEADER_LENGTH > msgLength)
- throw new BGPDocumentedException("Message length inconsistent with withdrawn router length.", BGPError.MALFORMED_ATTR_LIST);
-
- if (withdrawnRoutesLength == 0 && totalPathAttrLength == 0) {
- final BGPUpdateSynchronized event = new BGPUpdateSynchronized() {
-
- private static final long serialVersionUID = 5709361453437508337L;
-
- @Override
- public BGPTableType getTableType() {
- return new BGPTableType(BGPAddressFamily.IPv4, BGPSubsequentAddressFamily.Unicast);
- }
- };
- return event;
- }
-
- List<PathAttribute> pathAttributes;
- if (totalPathAttrLength > 0) {
- pathAttributes = parsePathAttributes(ByteArray.subByte(bytes, byteOffset, totalPathAttrLength));
- byteOffset += totalPathAttrLength;
- if (pathAttributes.get(0).getType() == TypeCode.MP_UNREACH_NLRI && totalPathAttrLength == 6) {
- if (pathAttributes.get(0).getValue() instanceof IPv6MP) {
- final BGPUpdateEvent event = new BGPUpdateSynchronized() {
-
- private static final long serialVersionUID = -6026212683738125407L;
-
- @Override
- public BGPTableType getTableType() {
- return new BGPTableType(BGPAddressFamily.IPv6, BGPSubsequentAddressFamily.Unicast);
- }
-
- };
- return event;
- } else if (pathAttributes.get(0).getValue() == null) {
- final BGPUpdateSynchronized event = new BGPUpdateSynchronized() {
-
- private static final long serialVersionUID = 5888562784007786559L;
-
- @Override
- public BGPTableType getTableType() {
- return new BGPTableType(BGPAddressFamily.LinkState, BGPSubsequentAddressFamily.Unicast);
- }
-
- };
- return event;
- }
- }
- } else {
- pathAttributes = Collections.emptyList();
- }
- eventBuilder.setPathAttributes(pathAttributes);
-
- final Set<Prefix<IPv4Address>> nlri = IPv4.FAMILY.prefixListForBytes(ByteArray.subByte(bytes, byteOffset, bytes.length - byteOffset));
- eventBuilder.setNlri(nlri);
-
- try {
- logger.trace("Update message was parsed.");
- return eventBuilder.buildEvent();
- } catch (final BGPParsingException e) {
- throw new BGPDocumentedException("Parsing unsuccessful: {}" + e.getMessage(), BGPError.MALFORMED_ATTR_LIST);
- }
- }
-
- /**
- * Parse different Path Attributes from given bytes.
- *
- * @param bytes byte array to be parsed
- * @return list of Path Attributes
- * @throws BGPParsingException
- */
- private static List<PathAttribute> parsePathAttributes(byte[] bytes) throws BGPDocumentedException {
- if (bytes.length == 0) {
- return Collections.emptyList();
- }
- final List<PathAttribute> list = Lists.newArrayList();
- while (bytes.length != 0) {
- PathAttribute attr;
- try {
- attr = PathAttributeParser.parseAttribute(bytes);
- bytes = ByteArray.cutBytes(bytes,
- PathAttribute.ATTR_FLAGS_SIZE + PathAttribute.ATTR_TYPE_CODE_SIZE + attr.getAttrLengthSize() + attr.getLength());
- list.add(attr);
- } catch (final BGPParsingException e) {
- logger.warn("Could not parse BGP attributes: {}", e.getMessage(), e);
- throw new BGPDocumentedException("Could not parse BGP attributes.", BGPError.MALFORMED_ATTR_LIST);
- }
- }
- return list;
- }
+public class BGPUpdateMessageParser implements MessageParser, MessageSerializer {
+ public static final int TYPE = 2;
+
+ private static final Logger LOG = LoggerFactory.getLogger(BGPUpdateMessageParser.class);
+
+ /**
+ * Size of the withdrawn_routes_length field, in bytes.
+ */
+ public static final int WITHDRAWN_ROUTES_LENGTH_SIZE = 2;
+ /**
+ * Size of the total_path_attr_length field, in bytes.
+ */
+ public static final int TOTAL_PATH_ATTR_LENGTH_SIZE = 2;
+
+ private final AttributeRegistry reg;
+
+ // Constructors -------------------------------------------------------
+ public BGPUpdateMessageParser(final AttributeRegistry reg) {
+ this.reg = Preconditions.checkNotNull(reg);
+ }
+
+ // Getters & setters --------------------------------------------------
+
+ @Override
+ public Update parseMessageBody(final ByteBuf buffer, final int messageLength) throws BGPDocumentedException {
+ Preconditions.checkArgument(buffer != null && buffer.readableBytes() != 0, "Byte array cannot be null or empty.");
+ LOG.trace("Started parsing of update message: {}", ByteBufUtil.hexDump(buffer));
+
+ final int withdrawnRoutesLength = buffer.readUnsignedShort();
+ final UpdateBuilder eventBuilder = new UpdateBuilder();
+
+ if (withdrawnRoutesLength > 0) {
+ final List<Ipv4Prefix> withdrawnRoutes = Ipv4Util.prefixListForBytes(ByteArray.readBytes(buffer, withdrawnRoutesLength));
+ eventBuilder.setWithdrawnRoutes(new WithdrawnRoutesBuilder().setWithdrawnRoutes(withdrawnRoutes).build());
+ }
+ final int totalPathAttrLength = buffer.readUnsignedShort();
+
+ if (withdrawnRoutesLength == 0 && totalPathAttrLength == 0) {
+ return eventBuilder.build();
+ }
+ if (totalPathAttrLength > 0) {
+ try {
+ final Attributes pathAttributes = this.reg.parseAttributes(buffer.readSlice(totalPathAttrLength));
+ eventBuilder.setAttributes(pathAttributes);
+ } catch (final BGPParsingException | RuntimeException e) {
+ // Catch everything else and turn it into a BGPDocumentedException
+ LOG.warn("Could not parse BGP attributes", e);
+ throw new BGPDocumentedException("Could not parse BGP attributes.", BGPError.MALFORMED_ATTR_LIST, e);
+ }
+ }
+ final List<Ipv4Prefix> nlri = Ipv4Util.prefixListForBytes(ByteArray.readAllBytes(buffer));
+ if (nlri != null && !nlri.isEmpty()) {
+ eventBuilder.setNlri(new NlriBuilder().setNlri(nlri).build());
+ }
+ final Update msg = eventBuilder.build();
+ LOG.debug("BGP Update message was parsed {}.", msg);
+ return msg;
+ }
+
+ @Override
+ public void serializeMessage(final Notification message, final ByteBuf bytes) {
+ Preconditions.checkArgument(message instanceof Update, "BGPUpdate message cannot be null");
+ LOG.trace("Started serializing update message: {}", message);
+ final Update update = (Update) message;
+
+ final ByteBuf messageBody = Unpooled.buffer();
+ final WithdrawnRoutes withdrawnRoutes = update.getWithdrawnRoutes();
+ if (withdrawnRoutes != null) {
+ final ByteBuf withdrawnRoutesBuf = Unpooled.buffer();
+ for (final Ipv4Prefix prefix : withdrawnRoutes.getWithdrawnRoutes()) {
+ withdrawnRoutesBuf.writeBytes(Ipv4Util.bytesForPrefixBegin(prefix));
+ }
+ messageBody.writeShort(withdrawnRoutesBuf.writerIndex());
+ messageBody.writeBytes(withdrawnRoutesBuf);
+ } else {
+ messageBody.writeZero(WITHDRAWN_ROUTES_LENGTH_SIZE);
+ }
+ if (update.getAttributes() != null) {
+ final ByteBuf pathAttributesBuf = Unpooled.buffer();
+ this.reg.serializeAttribute(update.getAttributes(), pathAttributesBuf);
+ messageBody.writeShort(pathAttributesBuf.writerIndex());
+ messageBody.writeBytes(pathAttributesBuf);
+ } else {
+ messageBody.writeZero(TOTAL_PATH_ATTR_LENGTH_SIZE);
+ }
+ final Nlri nlri = update.getNlri();
+ if (nlri != null) {
+ for (final Ipv4Prefix prefix : nlri.getNlri()) {
+ messageBody.writeBytes(Ipv4Util.bytesForPrefixBegin(prefix));
+ }
+ }
+ LOG.trace("Update message serialized to {}", ByteBufUtil.hexDump(messageBody));
+ MessageUtil.formatMessage(TYPE, messageBody, bytes);
+ }
}
Code Review / bgpcep.git / blobdiff