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/*
* Copyright 2014-2015 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.routing.bgp;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A class for handling BGP KEEPALIVE messages.
*/
final class BgpKeepalive {
private static final Logger log =
LoggerFactory.getLogger(BgpKeepalive.class);
/**
* Default constructor.
* <p>
* The constructor is private to prevent creating an instance of
* this utility class.
*/
private BgpKeepalive() {
}
/**
* Processes BGP KEEPALIVE message.
*
* @param bgpSession the BGP Session to use
* @param ctx the Channel Handler Context
* @param message the message to process
*/
static void processBgpKeepalive(BgpSession bgpSession,
ChannelHandlerContext ctx,
ChannelBuffer message) {
if (message.readableBytes() + BgpConstants.BGP_HEADER_LENGTH !=
BgpConstants.BGP_KEEPALIVE_EXPECTED_LENGTH) {
log.debug("BGP RX KEEPALIVE Error from {}: " +
"Invalid total message length {}. Expected {}",
bgpSession.remoteInfo().address(),
message.readableBytes() + BgpConstants.BGP_HEADER_LENGTH,
BgpConstants.BGP_KEEPALIVE_EXPECTED_LENGTH);
//
// ERROR: Bad Message Length
//
// Send NOTIFICATION and close the connection
ChannelBuffer txMessage =
BgpNotification.prepareBgpNotificationBadMessageLength(
message.readableBytes() + BgpConstants.BGP_HEADER_LENGTH);
ctx.getChannel().write(txMessage);
bgpSession.closeSession(ctx);
return;
}
//
// Parse the KEEPALIVE message: nothing to do
//
log.trace("BGP RX KEEPALIVE message from {}",
bgpSession.remoteInfo().address());
// Start the Session Timeout timer
bgpSession.restartSessionTimeoutTimer(ctx);
}
/**
* Prepares BGP KEEPALIVE message.
*
* @return the message to transmit (BGP header included)
*/
static ChannelBuffer prepareBgpKeepalive() {
ChannelBuffer message =
ChannelBuffers.buffer(BgpConstants.BGP_MESSAGE_MAX_LENGTH);
//
// Prepare the KEEPALIVE message payload: nothing to do
//
return BgpMessage.prepareBgpMessage(BgpConstants.BGP_TYPE_KEEPALIVE,
message);
}
}
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