RtNetlinkNeighborMessageTest.java revision cef7bc939fbc3baae5ccf78dcef63fc60e07ae21
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.system.OsConstants; 25import android.util.Log; 26import libcore.util.HexEncoding; 27 28import java.net.InetAddress; 29import java.net.Inet4Address; 30import java.net.UnknownHostException; 31import java.nio.ByteBuffer; 32import java.nio.ByteOrder; 33import java.util.Arrays; 34import junit.framework.TestCase; 35 36 37public class RtNetlinkNeighborMessageTest extends TestCase { 38 private final String TAG = "RtNetlinkNeighborMessageTest"; 39 40 // Hexadecimal representation of packet capture. 41 public static final String RTM_DELNEIGH_HEX = 42 // struct nlmsghdr 43 "4c000000" + // length = 76 44 "1d00" + // type = 29 (RTM_DELNEIGH) 45 "0000" + // flags 46 "00000000" + // seqno 47 "00000000" + // pid (0 == kernel) 48 // struct ndmsg 49 "02" + // family 50 "00" + // pad1 51 "0000" + // pad2 52 "15000000" + // interface index (21 == wlan0, on test device) 53 "0400" + // NUD state (0x04 == NUD_STALE) 54 "00" + // flags 55 "01" + // type 56 // struct nlattr: NDA_DST 57 "0800" + // length = 8 58 "0100" + // type (1 == NDA_DST, for neighbor messages) 59 "c0a89ffe" + // IPv4 address (== 192.168.159.254) 60 // struct nlattr: NDA_LLADDR 61 "0a00" + // length = 10 62 "0200" + // type (2 == NDA_LLADDR, for neighbor messages) 63 "00005e000164" + // MAC Address (== 00:00:5e:00:01:64) 64 "0000" + // padding, for 4 byte alignment 65 // struct nlattr: NDA_PROBES 66 "0800" + // length = 8 67 "0400" + // type (4 == NDA_PROBES, for neighbor messages) 68 "01000000" + // number of probes 69 // struct nlattr: NDA_CACHEINFO 70 "1400" + // length = 20 71 "0300" + // type (3 == NDA_CACHEINFO, for neighbor messages) 72 "05190000" + // ndm_used, as "clock ticks ago" 73 "05190000" + // ndm_confirmed, as "clock ticks ago" 74 "190d0000" + // ndm_updated, as "clock ticks ago" 75 "00000000"; // ndm_refcnt 76 public static final byte[] RTM_DELNEIGH = 77 HexEncoding.decode(RTM_DELNEIGH_HEX.toCharArray(), false); 78 79 // Hexadecimal representation of packet capture. 80 public static final String RTM_NEWNEIGH_HEX = 81 // struct nlmsghdr 82 "58000000" + // length = 88 83 "1c00" + // type = 28 (RTM_NEWNEIGH) 84 "0000" + // flags 85 "00000000" + // seqno 86 "00000000" + // pid (0 == kernel) 87 // struct ndmsg 88 "0a" + // family 89 "00" + // pad1 90 "0000" + // pad2 91 "15000000" + // interface index (21 == wlan0, on test device) 92 "0400" + // NUD state (0x04 == NUD_STALE) 93 "80" + // flags 94 "01" + // type 95 // struct nlattr: NDA_DST 96 "1400" + // length = 20 97 "0100" + // type (1 == NDA_DST, for neighbor messages) 98 "fe8000000000000086c9b2fffe6aed4b" + // IPv6 address (== fe80::86c9:b2ff:fe6a:ed4b) 99 // struct nlattr: NDA_LLADDR 100 "0a00" + // length = 10 101 "0200" + // type (2 == NDA_LLADDR, for neighbor messages) 102 "84c9b26aed4b" + // MAC Address (== 84:c9:b2:6a:ed:4b) 103 "0000" + // padding, for 4 byte alignment 104 // struct nlattr: NDA_PROBES 105 "0800" + // length = 8 106 "0400" + // type (4 == NDA_PROBES, for neighbor messages) 107 "01000000" + // number of probes 108 // struct nlattr: NDA_CACHEINFO 109 "1400" + // length = 20 110 "0300" + // type (3 == NDA_CACHEINFO, for neighbor messages) 111 "eb0e0000" + // ndm_used, as "clock ticks ago" 112 "861f0000" + // ndm_confirmed, as "clock ticks ago" 113 "00000000" + // ndm_updated, as "clock ticks ago" 114 "05000000"; // ndm_refcnt 115 public static final byte[] RTM_NEWNEIGH = 116 HexEncoding.decode(RTM_NEWNEIGH_HEX.toCharArray(), false); 117 118 // An example of the full response from an RTM_GETNEIGH query. 119 private static final String RTM_GETNEIGH_RESPONSE_HEX = 120 // <-- struct nlmsghr -->|<-- struct ndmsg -->|<-- struct nlattr: NDA_DST -->|<-- NDA_LLADDR -->|<-- NDA_PROBES -->|<-- NDA_CACHEINFO -->| 121 "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" + 122 "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" + 123 "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" + 124 "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" + 125 "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" + 126 "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" + 127 "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" + 128 "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" + 129 "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" + 130 "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" + 131 "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" + 132 "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" + 133 "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" + 134 "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"; 135 public static final byte[] RTM_GETNEIGH_RESPONSE = 136 HexEncoding.decode(RTM_GETNEIGH_RESPONSE_HEX.replaceAll(" ", "").toCharArray(), false); 137 138 public void testParseRtmDelNeigh() { 139 final ByteBuffer byteBuffer = ByteBuffer.wrap(RTM_DELNEIGH); 140 byteBuffer.order(ByteOrder.LITTLE_ENDIAN); // For testing. 141 final NetlinkMessage msg = NetlinkMessage.parse(byteBuffer); 142 assertNotNull(msg); 143 assertTrue(msg instanceof RtNetlinkNeighborMessage); 144 final RtNetlinkNeighborMessage neighMsg = (RtNetlinkNeighborMessage) msg; 145 146 final StructNlMsgHdr hdr = neighMsg.getHeader(); 147 assertNotNull(hdr); 148 assertEquals(76, hdr.nlmsg_len); 149 assertEquals(NetlinkConstants.RTM_DELNEIGH, hdr.nlmsg_type); 150 assertEquals(0, hdr.nlmsg_flags); 151 assertEquals(0, hdr.nlmsg_seq); 152 assertEquals(0, hdr.nlmsg_pid); 153 154 final StructNdMsg ndmsgHdr = neighMsg.getNdHeader(); 155 assertNotNull(ndmsgHdr); 156 assertEquals((byte) OsConstants.AF_INET, ndmsgHdr.ndm_family); 157 assertEquals(21, ndmsgHdr.ndm_ifindex); 158 assertEquals(StructNdMsg.NUD_STALE, ndmsgHdr.ndm_state); 159 final InetAddress destination = neighMsg.getDestination(); 160 assertNotNull(destination); 161 assertEquals(InetAddress.parseNumericAddress("192.168.159.254"), destination); 162 } 163 164 public void testParseRtmNewNeigh() { 165 final ByteBuffer byteBuffer = ByteBuffer.wrap(RTM_NEWNEIGH); 166 byteBuffer.order(ByteOrder.LITTLE_ENDIAN); // For testing. 167 final NetlinkMessage msg = NetlinkMessage.parse(byteBuffer); 168 assertNotNull(msg); 169 assertTrue(msg instanceof RtNetlinkNeighborMessage); 170 final RtNetlinkNeighborMessage neighMsg = (RtNetlinkNeighborMessage) msg; 171 172 final StructNlMsgHdr hdr = neighMsg.getHeader(); 173 assertNotNull(hdr); 174 assertEquals(88, hdr.nlmsg_len); 175 assertEquals(NetlinkConstants.RTM_NEWNEIGH, hdr.nlmsg_type); 176 assertEquals(0, hdr.nlmsg_flags); 177 assertEquals(0, hdr.nlmsg_seq); 178 assertEquals(0, hdr.nlmsg_pid); 179 180 final StructNdMsg ndmsgHdr = neighMsg.getNdHeader(); 181 assertNotNull(ndmsgHdr); 182 assertEquals((byte) OsConstants.AF_INET6, ndmsgHdr.ndm_family); 183 assertEquals(21, ndmsgHdr.ndm_ifindex); 184 assertEquals(StructNdMsg.NUD_STALE, ndmsgHdr.ndm_state); 185 final InetAddress destination = neighMsg.getDestination(); 186 assertNotNull(destination); 187 assertEquals(InetAddress.parseNumericAddress("fe80::86c9:b2ff:fe6a:ed4b"), destination); 188 } 189 190 public void testParseRtmGetNeighResponse() { 191 final ByteBuffer byteBuffer = ByteBuffer.wrap(RTM_GETNEIGH_RESPONSE); 192 byteBuffer.order(ByteOrder.LITTLE_ENDIAN); // For testing. 193 194 int messageCount = 0; 195 while (byteBuffer.remaining() > 0) { 196 final NetlinkMessage msg = NetlinkMessage.parse(byteBuffer); 197 assertNotNull(msg); 198 assertTrue(msg instanceof RtNetlinkNeighborMessage); 199 final RtNetlinkNeighborMessage neighMsg = (RtNetlinkNeighborMessage) msg; 200 201 final StructNlMsgHdr hdr = neighMsg.getHeader(); 202 assertNotNull(hdr); 203 assertEquals(NetlinkConstants.RTM_NEWNEIGH, hdr.nlmsg_type); 204 assertEquals(StructNlMsgHdr.NLM_F_MULTI, hdr.nlmsg_flags); 205 assertEquals(0, hdr.nlmsg_seq); 206 assertEquals(11070, hdr.nlmsg_pid); 207 208 messageCount++; 209 } 210 // TODO: add more detailed spot checks. 211 assertEquals(14, messageCount); 212 } 213 214 public void testCreateRtmNewNeighMessage() { 215 final int seqNo = 2635; 216 final int ifIndex = 14; 217 final byte[] llAddr = 218 new byte[] { (byte) 1, (byte) 2, (byte) 3, (byte) 4, (byte) 5, (byte) 6 }; 219 220 // Hexadecimal representation of our created packet. 221 final String expectedNewNeighHex = 222 // struct nlmsghdr 223 "30000000" + // length = 48 224 "1c00" + // type = 28 (RTM_NEWNEIGH) 225 "0501" + // flags (NLM_F_REQUEST | NLM_F_ACK | NLM_F_REPLACE) 226 "4b0a0000" + // seqno 227 "00000000" + // pid (0 == kernel) 228 // struct ndmsg 229 "02" + // family 230 "00" + // pad1 231 "0000" + // pad2 232 "0e000000" + // interface index (14) 233 "0800" + // NUD state (0x08 == NUD_DELAY) 234 "00" + // flags 235 "00" + // type 236 // struct nlattr: NDA_DST 237 "0800" + // length = 8 238 "0100" + // type (1 == NDA_DST, for neighbor messages) 239 "7f000001" + // IPv4 address (== 127.0.0.1) 240 // struct nlattr: NDA_LLADDR 241 "0a00" + // length = 10 242 "0200" + // type (2 == NDA_LLADDR, for neighbor messages) 243 "010203040506" + // MAC Address (== 01:02:03:04:05:06) 244 "0000"; // padding, for 4 byte alignment 245 final byte[] expectedNewNeigh = 246 HexEncoding.decode(expectedNewNeighHex.toCharArray(), false); 247 248 final byte[] bytes = RtNetlinkNeighborMessage.newNewNeighborMessage( 249 seqNo, Inet4Address.LOOPBACK, StructNdMsg.NUD_DELAY, ifIndex, llAddr); 250 if (!Arrays.equals(expectedNewNeigh, bytes)) { 251 assertEquals(expectedNewNeigh.length, bytes.length); 252 for (int i = 0; i < Math.min(expectedNewNeigh.length, bytes.length); i++) { 253 assertEquals(expectedNewNeigh[i], bytes[i]); 254 } 255 } 256 } 257} 258