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/*
* Copyright 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.sdnip;
import com.google.common.collect.ImmutableList;
import org.onlab.packet.Ethernet;
import org.onlab.packet.IpAddress;
import org.onlab.packet.IpPrefix;
import org.onlab.packet.MacAddress;
import org.onlab.packet.VlanId;
import org.onosproject.core.ApplicationId;
import org.onosproject.incubator.net.intf.Interface;
import org.onosproject.incubator.net.intf.InterfaceService;
import org.onosproject.net.ConnectPoint;
import org.onosproject.net.flow.DefaultTrafficSelector;
import org.onosproject.net.flow.DefaultTrafficTreatment;
import org.onosproject.net.flow.TrafficSelector;
import org.onosproject.net.flow.TrafficTreatment;
import org.onosproject.net.intent.Constraint;
import org.onosproject.net.intent.Key;
import org.onosproject.net.intent.MultiPointToSinglePointIntent;
import org.onosproject.net.intent.constraint.PartialFailureConstraint;
import org.onosproject.routing.FibListener;
import org.onosproject.routing.FibUpdate;
import org.onosproject.routing.IntentSynchronizationService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Collection;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import static com.google.common.base.Preconditions.checkArgument;
/**
* FIB component of SDN-IP.
*/
public class SdnIpFib implements FibListener {
private Logger log = LoggerFactory.getLogger(getClass());
private static final int PRIORITY_OFFSET = 100;
private static final int PRIORITY_MULTIPLIER = 5;
protected static final ImmutableList<Constraint> CONSTRAINTS
= ImmutableList.of(new PartialFailureConstraint());
private final Map<IpPrefix, MultiPointToSinglePointIntent> routeIntents;
private final ApplicationId appId;
private final InterfaceService interfaceService;
private final IntentSynchronizationService intentSynchronizer;
/**
* Class constructor.
*
* @param appId application ID to use when generating intents
* @param interfaceService interface service
* @param intentSynchronizer intent synchronizer
*/
public SdnIpFib(ApplicationId appId, InterfaceService interfaceService,
IntentSynchronizationService intentSynchronizer) {
routeIntents = new ConcurrentHashMap<>();
this.appId = appId;
this.interfaceService = interfaceService;
this.intentSynchronizer = intentSynchronizer;
}
@Override
public void update(Collection<FibUpdate> updates,
Collection<FibUpdate> withdraws) {
int submitCount = 0, withdrawCount = 0;
//
// NOTE: Semantically, we MUST withdraw existing intents before
// submitting new intents.
//
synchronized (this) {
MultiPointToSinglePointIntent intent;
//
// Prepare the Intent batch operations for the intents to withdraw
//
for (FibUpdate withdraw : withdraws) {
checkArgument(withdraw.type() == FibUpdate.Type.DELETE,
"FibUpdate with wrong type in withdraws list");
IpPrefix prefix = withdraw.entry().prefix();
intent = routeIntents.remove(prefix);
if (intent == null) {
log.trace("SDN-IP No intent in routeIntents to delete " +
"for prefix: {}", prefix);
continue;
}
intentSynchronizer.withdraw(intent);
withdrawCount++;
}
//
// Prepare the Intent batch operations for the intents to submit
//
for (FibUpdate update : updates) {
checkArgument(update.type() == FibUpdate.Type.UPDATE,
"FibUpdate with wrong type in updates list");
IpPrefix prefix = update.entry().prefix();
intent = generateRouteIntent(prefix, update.entry().nextHopIp(),
update.entry().nextHopMac());
if (intent == null) {
// This preserves the old semantics - if an intent can't be
// generated, we don't do anything with that prefix. But
// perhaps we should withdraw the old intent anyway?
continue;
}
routeIntents.put(prefix, intent);
intentSynchronizer.submit(intent);
submitCount++;
}
log.debug("SDN-IP submitted {}/{}, withdrew = {}/{}", submitCount,
updates.size(), withdrawCount, withdraws.size());
}
}
/**
* Generates a route intent for a prefix, the next hop IP address, and
* the next hop MAC address.
* <p/>
* This method will find the egress interface for the intent.
* Intent will match dst IP prefix and rewrite dst MAC address at all other
* border switches, then forward packets according to dst MAC address.
*
* @param prefix IP prefix of the route to add
* @param nextHopIpAddress IP address of the next hop
* @param nextHopMacAddress MAC address of the next hop
* @return the generated intent, or null if no intent should be submitted
*/
private MultiPointToSinglePointIntent generateRouteIntent(
IpPrefix prefix,
IpAddress nextHopIpAddress,
MacAddress nextHopMacAddress) {
// Find the attachment point (egress interface) of the next hop
Interface egressInterface =
interfaceService.getMatchingInterface(nextHopIpAddress);
if (egressInterface == null) {
log.warn("No outgoing interface found for {}",
nextHopIpAddress);
return null;
}
// Generate the intent itself
Set<ConnectPoint> ingressPorts = new HashSet<>();
ConnectPoint egressPort = egressInterface.connectPoint();
log.debug("Generating intent for prefix {}, next hop mac {}",
prefix, nextHopMacAddress);
for (Interface intf : interfaceService.getInterfaces()) {
// TODO this should be only peering interfaces
if (!intf.connectPoint().equals(egressInterface.connectPoint())) {
ConnectPoint srcPort = intf.connectPoint();
ingressPorts.add(srcPort);
}
}
// Match the destination IP prefix at the first hop
TrafficSelector.Builder selector = DefaultTrafficSelector.builder();
if (prefix.isIp4()) {
selector.matchEthType(Ethernet.TYPE_IPV4);
// if it is default route, then we do not need match destination
// IP address
if (prefix.prefixLength() != 0) {
selector.matchIPDst(prefix);
}
} else {
selector.matchEthType(Ethernet.TYPE_IPV6);
// if it is default route, then we do not need match destination
// IP address
if (prefix.prefixLength() != 0) {
selector.matchIPv6Dst(prefix);
}
}
// Rewrite the destination MAC address
TrafficTreatment.Builder treatment = DefaultTrafficTreatment.builder()
.setEthDst(nextHopMacAddress);
if (!egressInterface.vlan().equals(VlanId.NONE)) {
treatment.setVlanId(egressInterface.vlan());
// If we set VLAN ID, we have to make sure a VLAN tag exists.
// TODO support no VLAN -> VLAN routing
selector.matchVlanId(VlanId.ANY);
}
int priority =
prefix.prefixLength() * PRIORITY_MULTIPLIER + PRIORITY_OFFSET;
Key key = Key.of(prefix.toString(), appId);
return MultiPointToSinglePointIntent.builder()
.appId(appId)
.key(key)
.selector(selector.build())
.treatment(treatment.build())
.ingressPoints(ingressPorts)
.egressPoint(egressPort)
.priority(priority)
.constraints(CONSTRAINTS)
.build();
}
}
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