First implementation of BNG application
The application offers network level APIs for the BNG data plane.
An attachment (BngAttachment) at network level is identified by an arbitrary string.
The exposed APIs are key-value like APIs.
Change-Id: If0e484f487ea16dd8c7dd99642f75686e1dbc29a
diff --git a/app/src/main/java/org/opencord/bng/packets/PppTlv.java b/app/src/main/java/org/opencord/bng/packets/PppTlv.java
new file mode 100644
index 0000000..366ef7b
--- /dev/null
+++ b/app/src/main/java/org/opencord/bng/packets/PppTlv.java
@@ -0,0 +1,177 @@
+/*
+ * Copyright 2019-present Open Networking Foundation
+ *
+ * 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.opencord.bng.packets;
+
+import com.google.common.base.Objects;
+import org.onlab.packet.DeserializationException;
+
+import java.nio.ByteBuffer;
+import java.util.Arrays;
+
+/**
+ * Implements IPCP Type-Length-Value options.
+ */
+public class PppTlv {
+ public static final byte IPCPTLV_IP_ADDRESS = 0x03;
+ private byte type;
+ private byte length; // Including the 2 byte of Minimum header
+ private byte[] value;
+
+ /**
+ * Get the TLV type.
+ *
+ * @return the TLV type
+ */
+ public byte getType() {
+ return type;
+ }
+
+ /**
+ * Set the TLV type.
+ *
+ * @param type the TLV type to set
+ * @return this
+ */
+ public PppTlv setType(byte type) {
+ this.type = type;
+ return this;
+ }
+
+ /**
+ * Get the TLV length. The length include the 2 bytes of minimum header
+ * length.
+ *
+ * @return the TLV length
+ */
+ public byte getLength() {
+ return length;
+ }
+
+ /**
+ * Set the TLV length. Length must include the 2 bytes of minimum header
+ * length.
+ *
+ * @param length the TLV length to set.
+ * @return this
+ */
+ public PppTlv setLength(byte length) {
+ this.length = length;
+ return this;
+ }
+
+ /**
+ * Get the TLV value field as byte array.
+ *
+ * @return the TLV value field
+ */
+ public byte[] getValue() {
+ return value;
+ }
+
+ /**
+ * Set the TLV valued field.
+ *
+ * @param value the TLV value to set
+ * @return this
+ */
+ public PppTlv setValue(byte[] value) {
+ this.value = value;
+ return this;
+ }
+
+ public byte[] serialize() {
+ final byte[] data = new byte[this.length];
+ final ByteBuffer bb = ByteBuffer.wrap(data);
+ bb.put(type);
+ bb.put(length);
+ if (this.value != null) {
+ bb.put(this.value);
+ }
+ return data;
+ }
+
+ public PppTlv deserialize(final ByteBuffer bb) throws DeserializationException {
+ if (bb.remaining() < 2) {
+ throw new DeserializationException(
+ "Not enough bytes to deserialize PPP TLV options");
+ }
+ this.type = bb.get();
+ this.length = bb.get();
+ if (this.length > 2) {
+ this.value = new byte[this.length - 2];
+
+ // if there is an underrun just toss the TLV
+ // Length include the length of the TLV header itself
+ if (bb.remaining() < this.length - 2) {
+ throw new DeserializationException(
+ "Remaining bytes are less then the length of the PPP TLV tag");
+ }
+ bb.get(this.value);
+ return this;
+ } else {
+ return null;
+ }
+ }
+
+ @Override
+ public String toString() {
+ StringBuilder sb = new StringBuilder();
+ sb.append("[");
+ sb.append("type= ");
+ sb.append(this.type);
+ sb.append("length= ");
+ sb.append(this.length);
+ sb.append("value= ");
+ sb.append(Arrays.toString(this.value));
+ sb.append("]");
+ return sb.toString();
+ }
+
+ /*
+ * (non-Javadoc)
+ *
+ * @see java.lang.Object#equals(java.lang.Object)
+ */
+ @Override
+ public boolean equals(final Object obj) {
+ if (this == obj) {
+ return true;
+ }
+ if (obj == null) {
+ return false;
+ }
+ if (!(obj instanceof PppTlv)) {
+ return false;
+ }
+ final PppTlv other = (PppTlv) obj;
+ if (this.length != other.length) {
+ return false;
+ }
+ if (this.type != other.type) {
+ return false;
+ }
+ if (!Arrays.equals(this.value, other.value)) {
+ return false;
+ }
+ return true;
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hashCode(type, length, Arrays.hashCode(value));
+ }
+}