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/*
* Copyright (C) 2021 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 com.android.net.module.util.netlink;
import static android.system.OsConstants.NETLINK_ROUTE;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import android.net.InetAddresses;
import android.net.IpPrefix;
import android.system.OsConstants;
import androidx.test.filters.SmallTest;
import androidx.test.runner.AndroidJUnit4;
import com.android.net.module.util.HexDump;
import org.junit.Test;
import org.junit.runner.RunWith;
import java.net.Inet6Address;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
@RunWith(AndroidJUnit4.class)
@SmallTest
public class RtNetlinkRouteMessageTest {
private static final IpPrefix TEST_IPV6_GLOBAL_PREFIX = new IpPrefix("2001:db8:1::/64");
private static final Inet6Address TEST_IPV6_LINK_LOCAL_GATEWAY =
(Inet6Address) InetAddresses.parseNumericAddress("fe80::1");
// An example of the full RTM_NEWROUTE message.
private static final String RTM_NEWROUTE_HEX =
"88000000180000060000000000000000" // struct nlmsghr
+ "0A400000FC02000100000000" // struct rtmsg
+ "08000F00C7060000" // RTA_TABLE
+ "1400010020010DB8000100000000000000000000" // RTA_DST
+ "08000400DF020000" // RTA_OIF
+ "0800060000010000" // RTA_PRIORITY
+ "24000C0000000000000000005EEA000000000000" // RTA_CACHEINFO
+ "00000000000000000000000000000000"
+ "14000500FE800000000000000000000000000001" // RTA_GATEWAY
+ "0500140000000000"; // RTA_PREF
private ByteBuffer toByteBuffer(final String hexString) {
return ByteBuffer.wrap(HexDump.hexStringToByteArray(hexString));
}
private void assertRtmRouteMessage(final RtNetlinkRouteMessage routeMsg) {
final StructNlMsgHdr hdr = routeMsg.getHeader();
assertNotNull(hdr);
assertEquals(136, hdr.nlmsg_len);
assertEquals(NetlinkConstants.RTM_NEWROUTE, hdr.nlmsg_type);
assertEquals(0x600, hdr.nlmsg_flags);
assertEquals(0, hdr.nlmsg_seq);
assertEquals(0, hdr.nlmsg_pid);
final StructRtMsg rtmsg = routeMsg.getRtMsgHeader();
assertNotNull(rtmsg);
assertEquals((byte) OsConstants.AF_INET6, rtmsg.family);
assertEquals(64, rtmsg.dstLen);
assertEquals(0, rtmsg.srcLen);
assertEquals(0, rtmsg.tos);
assertEquals(0xFC, rtmsg.table);
assertEquals(NetlinkConstants.RTPROT_KERNEL, rtmsg.protocol);
assertEquals(NetlinkConstants.RT_SCOPE_UNIVERSE, rtmsg.scope);
assertEquals(NetlinkConstants.RTN_UNICAST, rtmsg.type);
assertEquals(0, rtmsg.flags);
assertEquals(routeMsg.getDestination(), TEST_IPV6_GLOBAL_PREFIX);
assertEquals(735, routeMsg.getInterfaceIndex());
assertEquals((Inet6Address) routeMsg.getGateway(), TEST_IPV6_LINK_LOCAL_GATEWAY);
assertNotNull(routeMsg.getRtaCacheInfo());
}
@Test
public void testParseRtmRouteMessage() {
final ByteBuffer byteBuffer = toByteBuffer(RTM_NEWROUTE_HEX);
byteBuffer.order(ByteOrder.LITTLE_ENDIAN); // For testing.
final NetlinkMessage msg = NetlinkMessage.parse(byteBuffer, NETLINK_ROUTE);
assertNotNull(msg);
assertTrue(msg instanceof RtNetlinkRouteMessage);
final RtNetlinkRouteMessage routeMsg = (RtNetlinkRouteMessage) msg;
assertRtmRouteMessage(routeMsg);
}
private static final String RTM_NEWROUTE_PACK_HEX =
"4C000000180000060000000000000000" // struct nlmsghr
+ "0A400000FC02000100000000" // struct rtmsg
+ "1400010020010DB8000100000000000000000000" // RTA_DST
+ "14000500FE800000000000000000000000000001" // RTA_GATEWAY
+ "08000400DF020000" // RTA_OIF
+ "24000C0000000000000000005EEA000000000000" // RTA_CACHEINFO
+ "00000000000000000000000000000000";
@Test
public void testPackRtmNewRoute() {
final ByteBuffer byteBuffer = toByteBuffer(RTM_NEWROUTE_PACK_HEX);
byteBuffer.order(ByteOrder.LITTLE_ENDIAN); // For testing.
final NetlinkMessage msg = NetlinkMessage.parse(byteBuffer, NETLINK_ROUTE);
assertNotNull(msg);
assertTrue(msg instanceof RtNetlinkRouteMessage);
final RtNetlinkRouteMessage routeMsg = (RtNetlinkRouteMessage) msg;
final ByteBuffer packBuffer = ByteBuffer.allocate(112);
packBuffer.order(ByteOrder.LITTLE_ENDIAN); // For testing.
routeMsg.pack(packBuffer);
assertEquals(RTM_NEWROUTE_PACK_HEX, HexDump.toHexString(packBuffer.array()));
}
private static final String RTM_NEWROUTE_TRUNCATED_HEX =
"48000000180000060000000000000000" // struct nlmsghr
+ "0A400000FC02000100000000" // struct rtmsg
+ "1400010020010DB8000100000000000000000000" // RTA_DST
+ "10000500FE8000000000000000000000" // RTA_GATEWAY(truncated)
+ "08000400DF020000"; // RTA_OIF
@Test
public void testTruncatedRtmNewRoute() {
final ByteBuffer byteBuffer = toByteBuffer(RTM_NEWROUTE_TRUNCATED_HEX);
byteBuffer.order(ByteOrder.LITTLE_ENDIAN); // For testing.
final NetlinkMessage msg = NetlinkMessage.parse(byteBuffer, NETLINK_ROUTE);
// Parsing RTM_NEWROUTE with truncated RTA_GATEWAY attribute returns null.
assertNull(msg);
}
private static final String RTM_NEWROUTE_IPV4_MAPPED_IPV6_GATEWAY_HEX =
"4C000000180000060000000000000000" // struct nlmsghr
+ "0A400000FC02000100000000" // struct rtmsg
+ "1400010020010DB8000100000000000000000000" // RTA_DST(2001:db8:1::/64)
+ "1400050000000000000000000000FFFF0A010203" // RTA_GATEWAY(::ffff:10.1.2.3)
+ "08000400DF020000"; // RTA_OIF
@Test
public void testParseRtmRouteMessage_IPv4MappedIPv6Gateway() {
final ByteBuffer byteBuffer = toByteBuffer(RTM_NEWROUTE_IPV4_MAPPED_IPV6_GATEWAY_HEX);
byteBuffer.order(ByteOrder.LITTLE_ENDIAN); // For testing.
final NetlinkMessage msg = NetlinkMessage.parse(byteBuffer, NETLINK_ROUTE);
// Parsing RTM_NEWROUTE with IPv4-mapped IPv6 gateway address, which doesn't match
// rtm_family after address parsing.
assertNull(msg);
}
private static final String RTM_NEWROUTE_IPV4_MAPPED_IPV6_DST_HEX =
"4C000000180000060000000000000000" // struct nlmsghr
+ "0A780000FC02000100000000" // struct rtmsg
+ "1400010000000000000000000000FFFF0A000000" // RTA_DST(::ffff:10.0.0.0/120)
+ "14000500FE800000000000000000000000000001" // RTA_GATEWAY(fe80::1)
+ "08000400DF020000"; // RTA_OIF
@Test
public void testParseRtmRouteMessage_IPv4MappedIPv6Destination() {
final ByteBuffer byteBuffer = toByteBuffer(RTM_NEWROUTE_IPV4_MAPPED_IPV6_DST_HEX);
byteBuffer.order(ByteOrder.LITTLE_ENDIAN); // For testing.
final NetlinkMessage msg = NetlinkMessage.parse(byteBuffer, NETLINK_ROUTE);
// Parsing RTM_NEWROUTE with IPv4-mapped IPv6 destination prefix, which doesn't match
// rtm_family after address parsing.
assertNull(msg);
}
// An example of the full RTM_NEWADDR message.
private static final String RTM_NEWADDR_HEX =
"48000000140000000000000000000000" // struct nlmsghr
+ "0A4080FD1E000000" // struct ifaddrmsg
+ "14000100FE800000000000002C415CFFFE096665" // IFA_ADDRESS
+ "14000600100E0000201C00002A70000045700000" // IFA_CACHEINFO
+ "0800080080000000"; // IFA_FLAGS
@Test
public void testParseMultipleRtmMessagesInOneByteBuffer() {
final ByteBuffer byteBuffer = toByteBuffer(RTM_NEWROUTE_HEX + RTM_NEWADDR_HEX);
byteBuffer.order(ByteOrder.LITTLE_ENDIAN); // For testing.
// Try to parse the RTM_NEWROUTE message.
NetlinkMessage msg = NetlinkMessage.parse(byteBuffer, NETLINK_ROUTE);
assertNotNull(msg);
assertTrue(msg instanceof RtNetlinkRouteMessage);
final RtNetlinkRouteMessage routeMsg = (RtNetlinkRouteMessage) msg;
assertRtmRouteMessage(routeMsg);
// Try to parse the RTM_NEWADDR message.
msg = NetlinkMessage.parse(byteBuffer, NETLINK_ROUTE);
assertNotNull(msg);
assertTrue(msg instanceof RtNetlinkAddressMessage);
}
@Test
public void testToString() {
final ByteBuffer byteBuffer = toByteBuffer(RTM_NEWROUTE_HEX);
byteBuffer.order(ByteOrder.LITTLE_ENDIAN); // For testing.
final NetlinkMessage msg = NetlinkMessage.parse(byteBuffer, NETLINK_ROUTE);
assertNotNull(msg);
assertTrue(msg instanceof RtNetlinkRouteMessage);
final RtNetlinkRouteMessage routeMsg = (RtNetlinkRouteMessage) msg;
final String expected = "RtNetlinkRouteMessage{ "
+ "nlmsghdr{"
+ "StructNlMsgHdr{ nlmsg_len{136}, nlmsg_type{24(RTM_NEWROUTE)}, "
+ "nlmsg_flags{1536(NLM_F_MATCH)}, nlmsg_seq{0}, nlmsg_pid{0} }}, "
+ "Rtmsg{"
+ "family: 10, dstLen: 64, srcLen: 0, tos: 0, table: 252, protocol: 2, "
+ "scope: 0, type: 1, flags: 0}, "
+ "destination{2001:db8:1::}, "
+ "gateway{fe80::1}, "
+ "ifindex{735}, "
+ "rta_cacheinfo{clntref: 0, lastuse: 0, expires: 59998, error: 0, used: 0, "
+ "id: 0, ts: 0, tsage: 0} "
+ "}";
assertEquals(expected, routeMsg.toString());
}
}
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