| /* |
| * Copyright 2014 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.sdnip.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.getRemoteAddress(), |
| 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.getRemoteAddress()); |
| |
| // 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); |
| } |
| } |