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/*
* Copyright (C) 2019 The Android Open Source Project
*
* 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 com.android.ike.ikev2.message;
import com.android.ike.ikev2.IkeTrafficSelector;
import com.android.ike.ikev2.exceptions.IkeException;
import java.nio.ByteBuffer;
/**
* IkeTsPayload represents an Traffic Selector Initiator Payload or an Traffic Selector Responder
* Payload.
*
* <p>Traffic Selector Initiator Payload and Traffic Selector Responder Payload have same format but
* different payload types. They describe the address ranges and port ranges of Child SA initiator
* and Child SA responder.
*
* @see <a href="https://tools.ietf.org/html/rfc7296#section-3.13">RFC 7296, Internet Key Exchange
* Protocol Version 2 (IKEv2)</a>
*/
public final class IkeTsPayload extends IkePayload {
// Length of reserved field in octets.
private static final int TS_HEADER_RESERVED_LEN = 3;
/** Number of Traffic Selectors */
public final int numTs;
public final IkeTrafficSelector[] trafficSelectors;
IkeTsPayload(boolean critical, byte[] payloadBody, boolean isInitiator) throws IkeException {
super((isInitiator ? PAYLOAD_TYPE_TS_INITIATOR : PAYLOAD_TYPE_TS_RESPONDER), critical);
ByteBuffer inputBuffer = ByteBuffer.wrap(payloadBody);
numTs = Byte.toUnsignedInt(inputBuffer.get());
// Skip RESERVED byte
inputBuffer.get(new byte[TS_HEADER_RESERVED_LEN]);
// Decode Traffic Selectors
byte[] tsBytes = new byte[inputBuffer.remaining()];
inputBuffer.get(tsBytes);
trafficSelectors = IkeTrafficSelector.decodeIkeTrafficSelectors(numTs, tsBytes);
}
/**
* Encode Traffic Selector Payload to ByteBuffer.
*
* @param nextPayload type of payload that follows this payload.
* @param byteBuffer destination ByteBuffer that stores encoded payload.
*/
@Override
protected void encodeToByteBuffer(@PayloadType int nextPayload, ByteBuffer byteBuffer) {
throw new UnsupportedOperationException(
"It is not supported to encode a " + getTypeString());
//TODO: Implement it.
}
/**
* Get entire payload length.
*
* @return entire payload length.
*/
@Override
protected int getPayloadLength() {
throw new UnsupportedOperationException(
"It is not supported to get payload length of " + getTypeString());
//TODO: Implement it.
}
/**
* Return the payload type as a String.
*
* @return the payload type as a String.
*/
@Override
public String getTypeString() {
switch (payloadType) {
case PAYLOAD_TYPE_ID_INITIATOR:
return "Traffic Selector Initiator Payload";
case PAYLOAD_TYPE_ID_RESPONDER:
return "Traffic Selector Responder Payload";
default:
// Won't reach here.
throw new IllegalArgumentException(
"Invalid Payload Type for Traffic Selector Payload.");
}
}
}
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