com/android/internal/net/ipsec/ike/exceptions/UnrecognizedIkeProtocolException.java

/*
 * 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.internal.net.ipsec.ike.exceptions;

import android.net.ipsec.ike.exceptions.IkeProtocolException;

/**
 * This exception represents an unrecognized error notification in a received response.
 *
 * <p>When receiving an unrecognized error notification in a response, IKE Session MUST assume that
 * the corresponding request has failed entirely. If it is in a request, IKE Session MUST ignore it.
 *
 * @see <a href="https://tools.ietf.org/html/rfc7296#section-3.10.1">RFC 7296, Internet Key Exchange
 *     Protocol Version 2 (IKEv2)</a>
 */
public final class UnrecognizedIkeProtocolException extends IkeProtocolException {
    /** Constructs an instance of UnrecognizedIkeProtocolException */
    public UnrecognizedIkeProtocolException(int errorType, byte[] notifyData) {
        super(errorType, notifyData);
    }

    @Override
    protected boolean isValidDataLength(int dataLen) {
        // Unrecognized error does not have an expected error data length. Any non-negative length
        // is valid
        return dataLen >= 0;
    }
}