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/*
* Copyright 2015-present 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.segmentrouting;
import org.onosproject.net.DeviceId;
import org.onosproject.net.Link;
import org.onosproject.net.link.LinkService;
import org.onosproject.segmentrouting.config.DeviceConfiguration;
import org.onosproject.segmentrouting.grouphandler.DefaultGroupHandler;
import org.onosproject.segmentrouting.grouphandler.NeighborSet;
import org.onosproject.store.service.EventuallyConsistentMap;
import org.slf4j.Logger;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import static org.slf4j.LoggerFactory.getLogger;
/**
* Tunnel Handler.
*/
public class TunnelHandler {
protected final Logger log = getLogger(getClass());
private final DeviceConfiguration config;
private final EventuallyConsistentMap<String, Tunnel> tunnelStore;
private Map<DeviceId, DefaultGroupHandler> groupHandlerMap;
private LinkService linkService;
/**
* Result of tunnel creation or removal.
*/
public enum Result {
/**
* Success.
*/
SUCCESS,
/**
* More than one router needs to specified to created a tunnel.
*/
WRONG_PATH,
/**
* The same tunnel exists already.
*/
TUNNEL_EXISTS,
/**
* The same tunnel ID exists already.
*/
ID_EXISTS,
/**
* Tunnel not found.
*/
TUNNEL_NOT_FOUND,
/**
* Cannot remove the tunnel used by a policy.
*/
TUNNEL_IN_USE,
/**
* Failed to create/remove groups for the tunnel.
*/
INTERNAL_ERROR
}
/**
* Constructs tunnel handler.
*
* @param linkService link service
* @param deviceConfiguration device configuration
* @param groupHandlerMap group handler map
* @param tunnelStore tunnel store
*/
public TunnelHandler(LinkService linkService,
DeviceConfiguration deviceConfiguration,
Map<DeviceId, DefaultGroupHandler> groupHandlerMap,
EventuallyConsistentMap<String, Tunnel> tunnelStore) {
this.linkService = linkService;
this.config = deviceConfiguration;
this.groupHandlerMap = groupHandlerMap;
this.tunnelStore = tunnelStore;
}
/**
* Creates a tunnel.
*
* @param tunnel tunnel reference to create a tunnel
* @return WRONG_PATH if the tunnel path is wrong, ID_EXISTS if the tunnel ID
* exists already, TUNNEL_EXISTS if the same tunnel exists, INTERNAL_ERROR
* if the tunnel creation failed internally, SUCCESS if the tunnel is created
* successfully
*/
public Result createTunnel(Tunnel tunnel) {
if (tunnel.labelIds().isEmpty() || tunnel.labelIds().size() < 3) {
log.error("More than one router needs to specified to created a tunnel");
return Result.WRONG_PATH;
}
if (tunnelStore.containsKey(tunnel.id())) {
log.warn("The same tunnel ID exists already");
return Result.ID_EXISTS;
}
if (tunnelStore.containsValue(tunnel)) {
log.warn("The same tunnel exists already");
return Result.TUNNEL_EXISTS;
}
int groupId = createGroupsForTunnel(tunnel);
if (groupId < 0) {
log.error("Failed to create groups for the tunnel");
return Result.INTERNAL_ERROR;
}
tunnel.setGroupId(groupId);
tunnelStore.put(tunnel.id(), tunnel);
return Result.SUCCESS;
}
/**
* Removes the tunnel with the tunnel ID given.
*
* @param tunnelInfo tunnel information to delete tunnels
* @return TUNNEL_NOT_FOUND if the tunnel to remove does not exists,
* INTERNAL_ERROR if the tunnel creation failed internally, SUCCESS
* if the tunnel is created successfully.
*/
public Result removeTunnel(Tunnel tunnelInfo) {
Tunnel tunnel = tunnelStore.get(tunnelInfo.id());
if (tunnel != null) {
DeviceId deviceId = config.getDeviceId(tunnel.labelIds().get(0));
if (tunnel.isAllowedToRemoveGroup()) {
if (groupHandlerMap.get(deviceId).removeGroup(tunnel.groupId())) {
tunnelStore.remove(tunnel.id());
} else {
log.error("Failed to remove the tunnel {}", tunnelInfo.id());
return Result.INTERNAL_ERROR;
}
} else {
log.debug("The group is not removed because it is being used.");
tunnelStore.remove(tunnel.id());
}
} else {
log.error("No tunnel found for tunnel ID {}", tunnelInfo.id());
return Result.TUNNEL_NOT_FOUND;
}
return Result.SUCCESS;
}
/**
* Returns the tunnel with the tunnel ID given.
*
* @param tid Tunnel ID
* @return Tunnel reference
*/
public Tunnel getTunnel(String tid) {
return tunnelStore.get(tid);
}
/**
* Returns all tunnels.
*
* @return list of Tunnels
*/
public List<Tunnel> getTunnels() {
List<Tunnel> tunnels = new ArrayList<>();
tunnelStore.values().forEach(tunnel -> tunnels.add(
new DefaultTunnel((DefaultTunnel) tunnel)));
return tunnels;
}
private int createGroupsForTunnel(Tunnel tunnel) {
Set<Integer> portNumbers;
final int groupError = -1;
DeviceId deviceId = config.getDeviceId(tunnel.labelIds().get(0));
if (deviceId == null) {
log.warn("No device found for SID {}", tunnel.labelIds().get(0));
return groupError;
} else if (groupHandlerMap.get(deviceId) == null) {
log.warn("group handler not found for {}", deviceId);
return groupError;
}
Set<DeviceId> deviceIds = new HashSet<>();
int sid = tunnel.labelIds().get(1);
if (config.isAdjacencySid(deviceId, sid)) {
portNumbers = config.getPortsForAdjacencySid(deviceId, sid);
for (Link link: linkService.getDeviceEgressLinks(deviceId)) {
for (Integer port: portNumbers) {
if (link.src().port().toLong() == port) {
deviceIds.add(link.dst().deviceId());
}
}
}
} else {
deviceIds.add(config.getDeviceId(sid));
}
// For these NeighborSet isMpls is meaningless.
NeighborSet ns = new NeighborSet(deviceIds, false, tunnel.labelIds().get(2));
// If the tunnel reuses any existing groups, then tunnel handler
// should not remove the group.
if (groupHandlerMap.get(deviceId).hasNextObjectiveId(ns)) {
tunnel.allowToRemoveGroup(false);
} else {
tunnel.allowToRemoveGroup(true);
}
return groupHandlerMap.get(deviceId).getNextObjectiveId(ns, null, true);
}
}