[Emu] [ONOS-2588] Implement BGP Message parser for parsing BGP protocol messgaes with encoding and decoding API
Change-Id: Id87f2bc98f1fd486123c86b7d715aadb504f5623
diff --git a/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/MpUnReachNlri.java b/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/MpUnReachNlri.java
new file mode 100644
index 0000000..3efed95
--- /dev/null
+++ b/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/MpUnReachNlri.java
@@ -0,0 +1,203 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.bgpio.types;
+
+import java.util.LinkedList;
+import java.util.List;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.onosproject.bgpio.exceptions.BGPParseException;
+import org.onosproject.bgpio.protocol.BGPLSNlri;
+import org.onosproject.bgpio.protocol.linkstate.BGPNodeLSNlriVer4;
+import org.onosproject.bgpio.protocol.linkstate.BGPPrefixIPv4LSNlriVer4;
+import org.onosproject.bgpio.util.Constants;
+import org.onosproject.bgpio.util.Validation;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.base.MoreObjects;
+
+/**
+ * Provides Implementation of MpUnReach Nlri BGP Path Attribute.
+ */
+public class MpUnReachNlri implements BGPValueType {
+
+ protected static final Logger log = LoggerFactory.getLogger(MpUnReachNlri.class);
+
+ public static final byte MPUNREACHNLRI_TYPE = 15;
+ public static final byte LINK_NLRITYPE = 2;
+ private boolean isMpUnReachNlri = false;
+ private final short afi;
+ private final byte safi;
+ private final List<BGPLSNlri> mpUnReachNlri;
+ private final int length;
+
+ /**
+ * Constructor to initialize parameters.
+ *
+ * @param mpUnReachNlri MpUnReach Nlri attribute
+ * @param afi address family identifier
+ * @param safi subsequent address family identifier
+ * @param length of MpUnReachNlri
+ */
+ public MpUnReachNlri(List<BGPLSNlri> mpUnReachNlri, short afi, byte safi,
+ int length) {
+ this.mpUnReachNlri = mpUnReachNlri;
+ this.isMpUnReachNlri = true;
+ this.afi = afi;
+ this.safi = safi;
+ this.length = length;
+ }
+
+ /**
+ * Reads from ChannelBuffer and parses MpUnReachNlri.
+ *
+ * @param cb ChannelBuffer
+ * @return object of MpUnReachNlri
+ * @throws BGPParseException while parsing MpUnReachNlri
+ */
+ public static MpUnReachNlri read(ChannelBuffer cb) throws BGPParseException {
+ ChannelBuffer tempBuf = cb.copy();
+ Validation parseFlags = Validation.parseAttributeHeader(cb);
+ int len = parseFlags.isShort() ? parseFlags.getLength() + Constants.TYPE_AND_LEN_AS_SHORT
+ : parseFlags.getLength() + Constants.TYPE_AND_LEN_AS_BYTE;
+ ChannelBuffer data = tempBuf.readBytes(len);
+
+ if (!parseFlags.getFirstBit() && parseFlags.getSecondBit()
+ && parseFlags.getThirdBit()) {
+ throw new BGPParseException(BGPErrorType.UPDATE_MESSAGE_ERROR,
+ BGPErrorType.ATTRIBUTE_FLAGS_ERROR, data);
+ }
+
+ if (cb.readableBytes() < parseFlags.getLength()) {
+ Validation.validateLen(BGPErrorType.UPDATE_MESSAGE_ERROR,
+ BGPErrorType.ATTRIBUTE_LENGTH_ERROR, parseFlags.getLength());
+ }
+
+ LinkedList<BGPLSNlri> mpUnReachNlri = new LinkedList<>();
+ BGPLSNlri bgpLSNlri = null;
+ short afi = 0;
+ byte safi = 0;
+ ChannelBuffer tempCb = cb.readBytes(parseFlags.getLength());
+ while (tempCb.readableBytes() > 0) {
+ afi = tempCb.readShort();
+ safi = tempCb.readByte();
+
+ //Supporting only for AFI 16388 / SAFI 71
+ if ((afi == Constants.AFI_VALUE) && (safi == Constants.SAFI_VALUE)
+ || (afi == Constants.AFI_VALUE) && (safi == Constants.VPN_SAFI_VALUE)) {
+ while (tempCb.readableBytes() > 0) {
+ short nlriType = tempCb.readShort();
+ short totNlriLen = tempCb.readShort();
+ if (tempCb.readableBytes() < totNlriLen) {
+ Validation.validateLen(
+ BGPErrorType.UPDATE_MESSAGE_ERROR,
+ BGPErrorType.ATTRIBUTE_LENGTH_ERROR, totNlriLen);
+ }
+ tempBuf = tempCb.readBytes(totNlriLen);
+ switch (nlriType) {
+ case BGPNodeLSNlriVer4.NODE_NLRITYPE:
+ bgpLSNlri = BGPNodeLSNlriVer4.read(tempBuf, afi, safi);
+ break;
+ case LINK_NLRITYPE:
+ //TODO: to be merged later
+ break;
+ case BGPPrefixIPv4LSNlriVer4.PREFIX_IPV4_NLRITYPE:
+ bgpLSNlri = BGPPrefixIPv4LSNlriVer4.read(tempBuf, afi,
+ safi);
+ break;
+ default:
+ log.debug("nlriType not supported" + nlriType);
+ }
+ mpUnReachNlri.add(bgpLSNlri);
+ }
+ } else {
+ //TODO: check with the values got from capability
+ throw new BGPParseException("Not Supporting afi " + afi
+ + "safi " + safi);
+ }
+ }
+ return new MpUnReachNlri(mpUnReachNlri, afi, safi,
+ parseFlags.getLength());
+ }
+
+ @Override
+ public short getType() {
+ return MPUNREACHNLRI_TYPE;
+ }
+
+ /**
+ * Returns SAFI.
+ *
+ * @return SAFI
+ */
+ public byte safi() {
+ return this.safi;
+ }
+
+ /**
+ * Returns AFI.
+ *
+ * @return AFI
+ */
+ public short afi() {
+ return this.afi;
+ }
+
+ /**
+ * Returns list of MpUnReach Nlri.
+ *
+ * @return list of MpUnReach Nlri
+ */
+ public List<BGPLSNlri> mpUnReachNlri() {
+ return this.mpUnReachNlri;
+ }
+
+ /**
+ * Returns whether MpReachNlri is present.
+ *
+ * @return whether MpReachNlri is present
+ */
+ public boolean isMpUnReachNlriSet() {
+ return this.isMpUnReachNlri;
+ }
+
+ /**
+ * Returns length of MpUnReach.
+ *
+ * @return length of MpUnReach
+ */
+ public int mpUnReachNlriLen() {
+ return this.length;
+ }
+
+ @Override
+ public int write(ChannelBuffer cb) {
+ //Not to be Implemented as of now
+ return 0;
+ }
+
+ @Override
+ public String toString() {
+ return MoreObjects.toStringHelper(getClass())
+ .add("mpReachNlri", mpUnReachNlri)
+ .add("afi", afi)
+ .add("safi", safi)
+ .add("length", length)
+ .toString();
+ }
+}
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