1/* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.net.netlink; 18 19import android.net.netlink.NetlinkConstants; 20import android.net.netlink.NetlinkMessage; 21import android.net.netlink.RtNetlinkNeighborMessage; 22import android.net.netlink.StructNdMsg; 23import android.net.netlink.StructNlMsgHdr; 24import android.test.suitebuilder.annotation.SmallTest; 25import android.system.OsConstants; 26import android.util.Log; 27import libcore.util.HexEncoding; 28 29import java.net.Inet4Address; 30import java.net.InetAddress; 31import java.net.UnknownHostException; 32import java.nio.ByteBuffer; 33import java.nio.ByteOrder; 34import java.util.Arrays; 35import junit.framework.TestCase; 36 37 38public class RtNetlinkNeighborMessageTest extends TestCase { 39 private final String TAG = "RtNetlinkNeighborMessageTest"; 40 41 // Hexadecimal representation of packet capture. 42 public static final String RTM_DELNEIGH_HEX = 43 // struct nlmsghdr 44 "4c000000" + // length = 76 45 "1d00" + // type = 29 (RTM_DELNEIGH) 46 "0000" + // flags 47 "00000000" + // seqno 48 "00000000" + // pid (0 == kernel) 49 // struct ndmsg 50 "02" + // family 51 "00" + // pad1 52 "0000" + // pad2 53 "15000000" + // interface index (21 == wlan0, on test device) 54 "0400" + // NUD state (0x04 == NUD_STALE) 55 "00" + // flags 56 "01" + // type 57 // struct nlattr: NDA_DST 58 "0800" + // length = 8 59 "0100" + // type (1 == NDA_DST, for neighbor messages) 60 "c0a89ffe" + // IPv4 address (== 192.168.159.254) 61 // struct nlattr: NDA_LLADDR 62 "0a00" + // length = 10 63 "0200" + // type (2 == NDA_LLADDR, for neighbor messages) 64 "00005e000164" + // MAC Address (== 00:00:5e:00:01:64) 65 "0000" + // padding, for 4 byte alignment 66 // struct nlattr: NDA_PROBES 67 "0800" + // length = 8 68 "0400" + // type (4 == NDA_PROBES, for neighbor messages) 69 "01000000" + // number of probes 70 // struct nlattr: NDA_CACHEINFO 71 "1400" + // length = 20 72 "0300" + // type (3 == NDA_CACHEINFO, for neighbor messages) 73 "05190000" + // ndm_used, as "clock ticks ago" 74 "05190000" + // ndm_confirmed, as "clock ticks ago" 75 "190d0000" + // ndm_updated, as "clock ticks ago" 76 "00000000"; // ndm_refcnt 77 public static final byte[] RTM_DELNEIGH = 78 HexEncoding.decode(RTM_DELNEIGH_HEX.toCharArray(), false); 79 80 // Hexadecimal representation of packet capture. 81 public static final String RTM_NEWNEIGH_HEX = 82 // struct nlmsghdr 83 "58000000" + // length = 88 84 "1c00" + // type = 28 (RTM_NEWNEIGH) 85 "0000" + // flags 86 "00000000" + // seqno 87 "00000000" + // pid (0 == kernel) 88 // struct ndmsg 89 "0a" + // family 90 "00" + // pad1 91 "0000" + // pad2 92 "15000000" + // interface index (21 == wlan0, on test device) 93 "0400" + // NUD state (0x04 == NUD_STALE) 94 "80" + // flags 95 "01" + // type 96 // struct nlattr: NDA_DST 97 "1400" + // length = 20 98 "0100" + // type (1 == NDA_DST, for neighbor messages) 99 "fe8000000000000086c9b2fffe6aed4b" + // IPv6 address (== fe80::86c9:b2ff:fe6a:ed4b) 100 // struct nlattr: NDA_LLADDR 101 "0a00" + // length = 10 102 "0200" + // type (2 == NDA_LLADDR, for neighbor messages) 103 "84c9b26aed4b" + // MAC Address (== 84:c9:b2:6a:ed:4b) 104 "0000" + // padding, for 4 byte alignment 105 // struct nlattr: NDA_PROBES 106 "0800" + // length = 8 107 "0400" + // type (4 == NDA_PROBES, for neighbor messages) 108 "01000000" + // number of probes 109 // struct nlattr: NDA_CACHEINFO 110 "1400" + // length = 20 111 "0300" + // type (3 == NDA_CACHEINFO, for neighbor messages) 112 "eb0e0000" + // ndm_used, as "clock ticks ago" 113 "861f0000" + // ndm_confirmed, as "clock ticks ago" 114 "00000000" + // ndm_updated, as "clock ticks ago" 115 "05000000"; // ndm_refcnt 116 public static final byte[] RTM_NEWNEIGH = 117 HexEncoding.decode(RTM_NEWNEIGH_HEX.toCharArray(), false); 118 119 // An example of the full response from an RTM_GETNEIGH query. 120 private static final String RTM_GETNEIGH_RESPONSE_HEX = 121 // <-- struct nlmsghr -->|<-- struct ndmsg -->|<-- struct nlattr: NDA_DST -->|<-- NDA_LLADDR -->|<-- NDA_PROBES -->|<-- NDA_CACHEINFO -->| 122 "58000000 1c00 0200 00000000 3e2b0000 0a 00 0000 15000000 4000 00 05 1400 0100 ff020000000000000000000000000001 0a00 0200 333300000001 0000 0800 0400 00000000 1400 0300 a2280000 32110000 32110000 01000000" + 123 "58000000 1c00 0200 00000000 3e2b0000 0a 00 0000 15000000 4000 00 05 1400 0100 ff0200000000000000000001ff000001 0a00 0200 3333ff000001 0000 0800 0400 00000000 1400 0300 0d280000 9d100000 9d100000 00000000" + 124 "58000000 1c00 0200 00000000 3e2b0000 0a 00 0000 15000000 0400 80 01 1400 0100 20010db800040ca00000000000000001 0a00 0200 84c9b26aed4b 0000 0800 0400 04000000 1400 0300 90100000 90100000 90080000 01000000" + 125 "58000000 1c00 0200 00000000 3e2b0000 0a 00 0000 15000000 4000 00 05 1400 0100 ff0200000000000000000001ff47da19 0a00 0200 3333ff47da19 0000 0800 0400 00000000 1400 0300 a1280000 31110000 31110000 01000000" + 126 "58000000 1c00 0200 00000000 3e2b0000 0a 00 0000 14000000 4000 00 05 1400 0100 ff020000000000000000000000000016 0a00 0200 333300000016 0000 0800 0400 00000000 1400 0300 912a0000 21130000 21130000 00000000" + 127 "58000000 1c00 0200 00000000 3e2b0000 0a 00 0000 14000000 4000 00 05 1400 0100 ff0200000000000000000001ffeace3b 0a00 0200 3333ffeace3b 0000 0800 0400 00000000 1400 0300 922a0000 22130000 22130000 00000000" + 128 "58000000 1c00 0200 00000000 3e2b0000 0a 00 0000 15000000 4000 00 05 1400 0100 ff0200000000000000000001ff5c2a83 0a00 0200 3333ff5c2a83 0000 0800 0400 00000000 1400 0300 391c0000 c9040000 c9040000 01000000" + 129 "58000000 1c00 0200 00000000 3e2b0000 0a 00 0000 01000000 4000 00 02 1400 0100 00000000000000000000000000000000 0a00 0200 000000000000 0000 0800 0400 00000000 1400 0300 cd180200 5d010200 5d010200 08000000" + 130 "58000000 1c00 0200 00000000 3e2b0000 0a 00 0000 15000000 4000 00 05 1400 0100 ff020000000000000000000000000002 0a00 0200 333300000002 0000 0800 0400 00000000 1400 0300 352a0000 c5120000 c5120000 00000000" + 131 "58000000 1c00 0200 00000000 3e2b0000 0a 00 0000 15000000 4000 00 05 1400 0100 ff020000000000000000000000000016 0a00 0200 333300000016 0000 0800 0400 00000000 1400 0300 982a0000 28130000 28130000 00000000" + 132 "58000000 1c00 0200 00000000 3e2b0000 0a 00 0000 15000000 0800 80 01 1400 0100 fe8000000000000086c9b2fffe6aed4b 0a00 0200 84c9b26aed4b 0000 0800 0400 00000000 1400 0300 23000000 24000000 57000000 13000000" + 133 "58000000 1c00 0200 00000000 3e2b0000 0a 00 0000 15000000 4000 00 05 1400 0100 ff0200000000000000000001ffeace3b 0a00 0200 3333ffeace3b 0000 0800 0400 00000000 1400 0300 992a0000 29130000 29130000 01000000" + 134 "58000000 1c00 0200 00000000 3e2b0000 0a 00 0000 14000000 4000 00 05 1400 0100 ff020000000000000000000000000002 0a00 0200 333300000002 0000 0800 0400 00000000 1400 0300 2e2a0000 be120000 be120000 00000000" + 135 "44000000 1c00 0200 00000000 3e2b0000 02 00 0000 18000000 4000 00 03 0800 0100 00000000 0400 0200 0800 0400 00000000 1400 0300 75280000 05110000 05110000 22000000"; 136 public static final byte[] RTM_GETNEIGH_RESPONSE = 137 HexEncoding.decode(RTM_GETNEIGH_RESPONSE_HEX.replaceAll(" ", "").toCharArray(), false); 138 139 @SmallTest 140 public void testParseRtmDelNeigh() { 141 final ByteBuffer byteBuffer = ByteBuffer.wrap(RTM_DELNEIGH); 142 byteBuffer.order(ByteOrder.LITTLE_ENDIAN); // For testing. 143 final NetlinkMessage msg = NetlinkMessage.parse(byteBuffer); 144 assertNotNull(msg); 145 assertTrue(msg instanceof RtNetlinkNeighborMessage); 146 final RtNetlinkNeighborMessage neighMsg = (RtNetlinkNeighborMessage) msg; 147 148 final StructNlMsgHdr hdr = neighMsg.getHeader(); 149 assertNotNull(hdr); 150 assertEquals(76, hdr.nlmsg_len); 151 assertEquals(NetlinkConstants.RTM_DELNEIGH, hdr.nlmsg_type); 152 assertEquals(0, hdr.nlmsg_flags); 153 assertEquals(0, hdr.nlmsg_seq); 154 assertEquals(0, hdr.nlmsg_pid); 155 156 final StructNdMsg ndmsgHdr = neighMsg.getNdHeader(); 157 assertNotNull(ndmsgHdr); 158 assertEquals((byte) OsConstants.AF_INET, ndmsgHdr.ndm_family); 159 assertEquals(21, ndmsgHdr.ndm_ifindex); 160 assertEquals(StructNdMsg.NUD_STALE, ndmsgHdr.ndm_state); 161 final InetAddress destination = neighMsg.getDestination(); 162 assertNotNull(destination); 163 assertEquals(InetAddress.parseNumericAddress("192.168.159.254"), destination); 164 } 165 166 @SmallTest 167 public void testParseRtmNewNeigh() { 168 final ByteBuffer byteBuffer = ByteBuffer.wrap(RTM_NEWNEIGH); 169 byteBuffer.order(ByteOrder.LITTLE_ENDIAN); // For testing. 170 final NetlinkMessage msg = NetlinkMessage.parse(byteBuffer); 171 assertNotNull(msg); 172 assertTrue(msg instanceof RtNetlinkNeighborMessage); 173 final RtNetlinkNeighborMessage neighMsg = (RtNetlinkNeighborMessage) msg; 174 175 final StructNlMsgHdr hdr = neighMsg.getHeader(); 176 assertNotNull(hdr); 177 assertEquals(88, hdr.nlmsg_len); 178 assertEquals(NetlinkConstants.RTM_NEWNEIGH, hdr.nlmsg_type); 179 assertEquals(0, hdr.nlmsg_flags); 180 assertEquals(0, hdr.nlmsg_seq); 181 assertEquals(0, hdr.nlmsg_pid); 182 183 final StructNdMsg ndmsgHdr = neighMsg.getNdHeader(); 184 assertNotNull(ndmsgHdr); 185 assertEquals((byte) OsConstants.AF_INET6, ndmsgHdr.ndm_family); 186 assertEquals(21, ndmsgHdr.ndm_ifindex); 187 assertEquals(StructNdMsg.NUD_STALE, ndmsgHdr.ndm_state); 188 final InetAddress destination = neighMsg.getDestination(); 189 assertNotNull(destination); 190 assertEquals(InetAddress.parseNumericAddress("fe80::86c9:b2ff:fe6a:ed4b"), destination); 191 } 192 193 @SmallTest 194 public void testParseRtmGetNeighResponse() { 195 final ByteBuffer byteBuffer = ByteBuffer.wrap(RTM_GETNEIGH_RESPONSE); 196 byteBuffer.order(ByteOrder.LITTLE_ENDIAN); // For testing. 197 198 int messageCount = 0; 199 while (byteBuffer.remaining() > 0) { 200 final NetlinkMessage msg = NetlinkMessage.parse(byteBuffer); 201 assertNotNull(msg); 202 assertTrue(msg instanceof RtNetlinkNeighborMessage); 203 final RtNetlinkNeighborMessage neighMsg = (RtNetlinkNeighborMessage) msg; 204 205 final StructNlMsgHdr hdr = neighMsg.getHeader(); 206 assertNotNull(hdr); 207 assertEquals(NetlinkConstants.RTM_NEWNEIGH, hdr.nlmsg_type); 208 assertEquals(StructNlMsgHdr.NLM_F_MULTI, hdr.nlmsg_flags); 209 assertEquals(0, hdr.nlmsg_seq); 210 assertEquals(11070, hdr.nlmsg_pid); 211 212 messageCount++; 213 } 214 // TODO: add more detailed spot checks. 215 assertEquals(14, messageCount); 216 } 217 218 @SmallTest 219 public void testCreateRtmNewNeighMessage() { 220 final int seqNo = 2635; 221 final int ifIndex = 14; 222 final byte[] llAddr = 223 new byte[] { (byte) 1, (byte) 2, (byte) 3, (byte) 4, (byte) 5, (byte) 6 }; 224 225 // Hexadecimal representation of our created packet. 226 final String expectedNewNeighHex = 227 // struct nlmsghdr 228 "30000000" + // length = 48 229 "1c00" + // type = 28 (RTM_NEWNEIGH) 230 "0501" + // flags (NLM_F_REQUEST | NLM_F_ACK | NLM_F_REPLACE) 231 "4b0a0000" + // seqno 232 "00000000" + // pid (0 == kernel) 233 // struct ndmsg 234 "02" + // family 235 "00" + // pad1 236 "0000" + // pad2 237 "0e000000" + // interface index (14) 238 "0800" + // NUD state (0x08 == NUD_DELAY) 239 "00" + // flags 240 "00" + // type 241 // struct nlattr: NDA_DST 242 "0800" + // length = 8 243 "0100" + // type (1 == NDA_DST, for neighbor messages) 244 "7f000001" + // IPv4 address (== 127.0.0.1) 245 // struct nlattr: NDA_LLADDR 246 "0a00" + // length = 10 247 "0200" + // type (2 == NDA_LLADDR, for neighbor messages) 248 "010203040506" + // MAC Address (== 01:02:03:04:05:06) 249 "0000"; // padding, for 4 byte alignment 250 final byte[] expectedNewNeigh = 251 HexEncoding.decode(expectedNewNeighHex.toCharArray(), false); 252 253 final byte[] bytes = RtNetlinkNeighborMessage.newNewNeighborMessage( 254 seqNo, Inet4Address.LOOPBACK, StructNdMsg.NUD_DELAY, ifIndex, llAddr); 255 if (!Arrays.equals(expectedNewNeigh, bytes)) { 256 assertEquals(expectedNewNeigh.length, bytes.length); 257 for (int i = 0; i < Math.min(expectedNewNeigh.length, bytes.length); i++) { 258 assertEquals(expectedNewNeigh[i], bytes[i]); 259 } 260 } 261 } 262} 263