io.netlibs.bgp.handlers.InboundOpenCapabilitiesProcessor.java Source code

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Here is the source code for io.netlibs.bgp.handlers.InboundOpenCapabilitiesProcessor.java

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/**
 *  Copyright 2012 Rainer Bieniek (Rainer.Bieniek@web.de)
 *
 *  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.
 * 
 * File: org.bgp4j.netty.handlers.OpenCapabilitiesProcessor.java 
 */
package io.netlibs.bgp.handlers;

import io.netlibs.bgp.netty.protocol.open.BadPeerASNotificationPacket;
import io.netlibs.bgp.netty.protocol.open.OpenPacket;
import io.netlibs.bgp.protocol.AddressFamily;
import io.netlibs.bgp.protocol.BGPv4Constants;
import io.netlibs.bgp.protocol.SubsequentAddressFamily;
import io.netlibs.bgp.protocol.capabilities.AutonomousSystem4Capability;
import io.netlibs.bgp.protocol.capabilities.MultiProtocolCapability;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import lombok.extern.slf4j.Slf4j;

/**
 * This handler performs inbound handling of OPEN capabilites for: - 4 octet AS number handling
 * 
 * @author Rainer Bieniek (Rainer.Bieniek@web.de)
 *
 */

@Slf4j
public class InboundOpenCapabilitiesProcessor extends SimpleChannelInboundHandler<OpenPacket> {

    public static final String HANDLER_NAME = "BGP4-InboundOpenCapabilitiesProcessor";

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, OpenPacket open) throws Exception {

        AutonomousSystem4Capability as4Cap = open.findCapability(AutonomousSystem4Capability.class);

        //
        // TODO decide wether this functionality can and should be removed
        if (as4Cap != null) {
            int openASNumber = open.getAutonomousSystem();
            int capASNumber = as4Cap.getAutonomousSystem();

            if (capASNumber > 65535) {
                if (openASNumber != BGPv4Constants.BGP_AS_TRANS) {
                    log.error("4 Octet AS numbers must transit AS {} but has {}", BGPv4Constants.BGP_AS_TRANS,
                            openASNumber);

                    NotificationHelper.sendNotification(ctx, new BadPeerASNotificationPacket(),
                            new BgpEventFireChannelFutureListener(ctx));
                    return;
                }
            } else {
                if (openASNumber != capASNumber) {
                    log.error("4 octet AS number {} not matching 2 octet AS number {} in 2 octet case", capASNumber,
                            openASNumber);

                    NotificationHelper.sendNotification(ctx, new BadPeerASNotificationPacket(),
                            new BgpEventFireChannelFutureListener(ctx));
                    return;
                }
            }
        }

        MultiProtocolCapability ipv4UnicastCap = new MultiProtocolCapability(AddressFamily.IPv4,
                SubsequentAddressFamily.NLRI_UNICAST_FORWARDING);
        MultiProtocolCapability ipv4AnycastCap = new MultiProtocolCapability(AddressFamily.IPv4,
                SubsequentAddressFamily.NLRI_UNICAST_MULTICAST_FORWARDING);

        if (open.getCapabilities().contains(ipv4AnycastCap)) {
            open.getCapabilities().remove(ipv4AnycastCap);
            open.getCapabilities().add(ipv4UnicastCap);
            open.getCapabilities().add(new MultiProtocolCapability(AddressFamily.IPv4,
                    SubsequentAddressFamily.NLRI_MULTICAST_FORWARDING));
        } else if (!open.getCapabilities().contains(ipv4UnicastCap)) {
            open.getCapabilities().add(ipv4UnicastCap);
        }

        ctx.fireChannelRead(open);

    }

}