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/*
* Copyright (C) 2019 The Android Open Source Project
*
* 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 android.net.shared;
import static android.net.RouteInfo.RTN_THROW;
import static android.net.RouteInfo.RTN_UNICAST;
import static android.net.RouteInfo.RTN_UNREACHABLE;
import android.net.INetd;
import android.net.IpPrefix;
import android.net.RouteInfo;
import android.os.RemoteException;
import android.os.ServiceSpecificException;
import java.util.List;
/** @hide*/
public class RouteUtils {
/** Used to modify the specified route. */
public enum ModifyOperation {
ADD,
REMOVE,
}
private static String findNextHop(final RouteInfo route) {
final String nextHop;
switch (route.getType()) {
case RTN_UNICAST:
if (route.hasGateway()) {
nextHop = route.getGateway().getHostAddress();
} else {
nextHop = INetd.NEXTHOP_NONE;
}
break;
case RTN_UNREACHABLE:
nextHop = INetd.NEXTHOP_UNREACHABLE;
break;
case RTN_THROW:
nextHop = INetd.NEXTHOP_THROW;
break;
default:
nextHop = INetd.NEXTHOP_NONE;
break;
}
return nextHop;
}
/** Add |routes| to local network. */
public static void addRoutesToLocalNetwork(final INetd netd, final String iface,
final List<RouteInfo> routes) {
for (RouteInfo route : routes) {
if (!route.isDefaultRoute()) {
modifyRoute(netd, ModifyOperation.ADD, INetd.LOCAL_NET_ID, route);
}
}
// IPv6 link local should be activated always.
modifyRoute(netd, ModifyOperation.ADD, INetd.LOCAL_NET_ID,
new RouteInfo(new IpPrefix("fe80::/64"), null, iface, RTN_UNICAST));
}
/** Remove routes from local network. */
public static int removeRoutesFromLocalNetwork(final INetd netd, final List<RouteInfo> routes) {
int failures = 0;
for (RouteInfo route : routes) {
try {
modifyRoute(netd, ModifyOperation.REMOVE, INetd.LOCAL_NET_ID, route);
} catch (IllegalStateException e) {
failures++;
}
}
return failures;
}
/** Add or remove |route|. */
public static void modifyRoute(final INetd netd, final ModifyOperation op, final int netId,
final RouteInfo route) {
final String ifName = route.getInterface();
final String dst = route.getDestination().toString();
final String nextHop = findNextHop(route);
try {
switch(op) {
case ADD:
netd.networkAddRoute(netId, ifName, dst, nextHop);
break;
case REMOVE:
netd.networkRemoveRoute(netId, ifName, dst, nextHop);
break;
default:
throw new IllegalStateException("Unsupported modify operation:" + op);
}
} catch (RemoteException | ServiceSpecificException e) {
throw new IllegalStateException(e);
}
}
}
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