[Emu] [ONOS-2601] Implement BGP Update protocol message and parse all basic path attributes.
Change-Id: I85f912eeebacf46d699fdcf5549e06bae702823e
diff --git a/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/NextHop.java b/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/NextHop.java
new file mode 100644
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+++ b/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/NextHop.java
@@ -0,0 +1,138 @@
+/*
+ * 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.net.InetAddress;
+import java.util.Objects;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.onlab.packet.Ip4Address;
+import org.onosproject.bgpio.exceptions.BGPParseException;
+import org.onosproject.bgpio.util.Validation;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Preconditions;
+
+/**
+ * Implementation of NextHop BGP Path Attribute.
+ */
+public class NextHop implements BGPValueType {
+ private static final Logger log = LoggerFactory.getLogger(NextHop.class);
+ public static final byte NEXTHOP_TYPE = 3;
+ public static final int TYPE_AND_LEN_AS_SHORT = 4;
+ public static final int TYPE_AND_LEN_AS_BYTE = 3;
+
+ private boolean isNextHop = false;
+ private Ip4Address nextHop;
+
+ /**
+ * Constructor to initialize parameters.
+ *
+ * @param nextHop nextHop address
+ */
+ public NextHop(Ip4Address nextHop) {
+ this.nextHop = Preconditions.checkNotNull(nextHop);
+ this.isNextHop = true;
+ }
+
+ /**
+ * Returns whether next hop is present.
+ *
+ * @return whether next hop is present
+ */
+ public boolean isNextHopSet() {
+ return this.isNextHop;
+ }
+
+ /**
+ * Reads from ChannelBuffer and parses NextHop.
+ *
+ * @param cb ChannelBuffer
+ * @return object of NextHop
+ * @throws BGPParseException while parsing nexthop attribute
+ */
+ public static NextHop read(ChannelBuffer cb) throws BGPParseException {
+ Ip4Address nextHop;
+ ChannelBuffer tempCb = cb.copy();
+ Validation parseFlags = Validation.parseAttributeHeader(cb);
+
+ if (cb.readableBytes() < parseFlags.getLength()) {
+ Validation.validateLen(BGPErrorType.UPDATE_MESSAGE_ERROR, BGPErrorType.ATTRIBUTE_LENGTH_ERROR,
+ parseFlags.getLength());
+ }
+ int len = parseFlags.isShort() ? parseFlags.getLength() + TYPE_AND_LEN_AS_SHORT : parseFlags
+ .getLength() + TYPE_AND_LEN_AS_BYTE;
+ ChannelBuffer data = tempCb.readBytes(len);
+ if (parseFlags.getFirstBit() && !parseFlags.getSecondBit() && parseFlags.getThirdBit()) {
+ throw new BGPParseException(BGPErrorType.UPDATE_MESSAGE_ERROR, BGPErrorType.ATTRIBUTE_FLAGS_ERROR, data);
+ }
+
+ //TODO: use Validation.toInetAddress once Validation is merged
+ InetAddress ipAddress = (InetAddress) cb.readBytes(parseFlags.getLength());
+ if (ipAddress.isMulticastAddress()) {
+ throw new BGPParseException("Multicast address is not supported");
+ }
+
+ nextHop = Ip4Address.valueOf(ipAddress);
+ return new NextHop(nextHop);
+ }
+
+ /**
+ * Return nexthop address.
+ *
+ * @return nexthop address
+ */
+ public Ip4Address nextHop() {
+ return nextHop;
+ }
+
+ @Override
+ public short getType() {
+ return NEXTHOP_TYPE;
+ }
+
+ @Override
+ public int write(ChannelBuffer cb) {
+ //Not required to be implemented now
+ return 0;
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hash(nextHop);
+ }
+
+ @Override
+ public boolean equals(Object obj) {
+ if (this == obj) {
+ return true;
+ }
+ if (obj instanceof NextHop) {
+ NextHop other = (NextHop) obj;
+ return Objects.equals(nextHop, other.nextHop);
+ }
+ return false;
+ }
+
+ @Override
+ public String toString() {
+ return MoreObjects.toStringHelper(getClass())
+ .add("nextHop", nextHop)
+ .toString();
+ }
+}
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