summaryrefslogtreecommitdiffstats
path: root/print-icmp6.c
blob: 4738e77a9e75a12f81051dee588fe9f2d46d2d71 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
/*
 * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
 * the University nor the names of its contributors may be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

/* \summary: IPv6 Internet Control Message Protocol (ICMPv6) printer */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "netdissect-stdinc.h"

#include <stdio.h>
#include <string.h>

#include "netdissect.h"
#include "addrtoname.h"
#include "addrtostr.h"
#include "extract.h"

#include "ip6.h"
#include "ipproto.h"

#include "udp.h"
#include "ah.h"

/*	NetBSD: icmp6.h,v 1.13 2000/08/03 16:30:37 itojun Exp	*/
/*	$KAME: icmp6.h,v 1.22 2000/08/03 15:25:16 jinmei Exp $	*/

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

struct icmp6_hdr {
	nd_uint8_t	icmp6_type;	/* type field */
	nd_uint8_t	icmp6_code;	/* code field */
	nd_uint16_t	icmp6_cksum;	/* checksum field */
	union {
		nd_uint32_t	icmp6_un_data32[1]; /* type-specific field */
		nd_uint16_t	icmp6_un_data16[2]; /* type-specific field */
		nd_uint8_t	icmp6_un_data8[4];  /* type-specific field */
		nd_byte		icmp6_un_data[1];   /* type-specific field */
	} icmp6_dataun;
};

#define icmp6_data32	icmp6_dataun.icmp6_un_data32
#define icmp6_data16	icmp6_dataun.icmp6_un_data16
#define icmp6_data8	icmp6_dataun.icmp6_un_data8
#define icmp6_data	icmp6_dataun.icmp6_un_data
#define icmp6_pptr	icmp6_data32[0]		/* parameter prob */
#define icmp6_mtu	icmp6_data32[0]		/* packet too big */
#define icmp6_id	icmp6_data16[0]		/* echo request/reply */
#define icmp6_seq	icmp6_data16[1]		/* echo request/reply */
#define icmp6_maxdelay	icmp6_data16[0]		/* mcast group membership */

#define ICMP6_DST_UNREACH		1	/* dest unreachable, codes: */
#define ICMP6_PACKET_TOO_BIG		2	/* packet too big */
#define ICMP6_TIME_EXCEEDED		3	/* time exceeded, code: */
#define ICMP6_PARAM_PROB		4	/* ip6 header bad */

#define ICMP6_ECHO_REQUEST		128	/* echo service */
#define ICMP6_ECHO_REPLY		129	/* echo reply */
#define ICMP6_MEMBERSHIP_QUERY		130	/* group membership query */
#define MLD6_LISTENER_QUERY		130	/* multicast listener query */
#define ICMP6_MEMBERSHIP_REPORT		131	/* group membership report */
#define MLD6_LISTENER_REPORT		131	/* multicast listener report */
#define ICMP6_MEMBERSHIP_REDUCTION	132	/* group membership termination */
#define MLD6_LISTENER_DONE		132	/* multicast listener done */

#define ND_ROUTER_SOLICIT		133	/* router solicitation */
#define ND_ROUTER_ADVERT		134	/* router advertisement */
#define ND_NEIGHBOR_SOLICIT		135	/* neighbor solicitation */
#define ND_NEIGHBOR_ADVERT		136	/* neighbor advertisement */
#define ND_REDIRECT			137	/* redirect */

#define ICMP6_ROUTER_RENUMBERING	138	/* router renumbering */

#define ICMP6_WRUREQUEST		139	/* who are you request */
#define ICMP6_WRUREPLY			140	/* who are you reply */
#define ICMP6_FQDN_QUERY		139	/* FQDN query */
#define ICMP6_FQDN_REPLY		140	/* FQDN reply */
#define ICMP6_NI_QUERY			139	/* node information request - RFC 4620 */
#define ICMP6_NI_REPLY			140	/* node information reply - RFC 4620 */
#define IND_SOLICIT			141	/* inverse neighbor solicitation */
#define IND_ADVERT			142	/* inverse neighbor advertisement */

#define ICMP6_V2_MEMBERSHIP_REPORT	143	/* v2 membership report */
#define MLDV2_LISTENER_REPORT		143	/* v2 multicast listener report */
#define ICMP6_HADISCOV_REQUEST		144
#define ICMP6_HADISCOV_REPLY		145
#define ICMP6_MOBILEPREFIX_SOLICIT	146
#define ICMP6_MOBILEPREFIX_ADVERT	147

#define MLD6_MTRACE_RESP		200	/* mtrace response(to sender) */
#define MLD6_MTRACE			201	/* mtrace messages */

#define ICMP6_MAXTYPE			201

#define ICMP6_DST_UNREACH_NOROUTE	0	/* no route to destination */
#define ICMP6_DST_UNREACH_ADMIN		1	/* administratively prohibited */
#define ICMP6_DST_UNREACH_NOTNEIGHBOR	2	/* not a neighbor(obsolete) */
#define ICMP6_DST_UNREACH_BEYONDSCOPE	2	/* beyond scope of source address */
#define ICMP6_DST_UNREACH_ADDR		3	/* address unreachable */
#define ICMP6_DST_UNREACH_NOPORT	4	/* port unreachable */

#define ICMP6_TIME_EXCEED_TRANSIT	0	/* ttl==0 in transit */
#define ICMP6_TIME_EXCEED_REASSEMBLY	1	/* ttl==0 in reass */

#define ICMP6_PARAMPROB_HEADER		0	/* erroneous header field */
#define ICMP6_PARAMPROB_NEXTHEADER	1	/* unrecognized next header */
#define ICMP6_PARAMPROB_OPTION		2	/* unrecognized option */
#define ICMP6_PARAMPROB_FRAGHDRCHAIN	3	/* incomplete header chain */

#define ICMP6_INFOMSG_MASK		0x80	/* all informational messages */

#define ICMP6_NI_SUBJ_IPV6	0	/* Query Subject is an IPv6 address */
#define ICMP6_NI_SUBJ_FQDN	1	/* Query Subject is a Domain name */
#define ICMP6_NI_SUBJ_IPV4	2	/* Query Subject is an IPv4 address */

#define ICMP6_NI_SUCCESS	0	/* node information successful reply */
#define ICMP6_NI_REFUSED	1	/* node information request is refused */
#define ICMP6_NI_UNKNOWN	2	/* unknown Qtype */

#define ICMP6_ROUTER_RENUMBERING_COMMAND  0	/* rr command */
#define ICMP6_ROUTER_RENUMBERING_RESULT   1	/* rr result */
#define ICMP6_ROUTER_RENUMBERING_SEQNUM_RESET   255	/* rr seq num reset */

/* Used in kernel only */
#define ND_REDIRECT_ONLINK	0	/* redirect to an on-link node */
#define ND_REDIRECT_ROUTER	1	/* redirect to a better router */

/*
 * Multicast Listener Discovery
 */
struct mld6_hdr {
	struct icmp6_hdr	mld6_hdr;
	nd_ipv6			mld6_addr; /* multicast address */
};

#define mld6_type	mld6_hdr.icmp6_type
#define mld6_code	mld6_hdr.icmp6_code
#define mld6_cksum	mld6_hdr.icmp6_cksum
#define mld6_maxdelay	mld6_hdr.icmp6_data16[0]
#define mld6_reserved	mld6_hdr.icmp6_data16[1]

#define MLD_MINLEN	24
#define MLDV2_MINLEN	28

/*
 * Neighbor Discovery
 */

struct nd_router_solicit {	/* router solicitation */
	struct icmp6_hdr	nd_rs_hdr;
	/* could be followed by options */
};

#define nd_rs_type	nd_rs_hdr.icmp6_type
#define nd_rs_code	nd_rs_hdr.icmp6_code
#define nd_rs_cksum	nd_rs_hdr.icmp6_cksum
#define nd_rs_reserved	nd_rs_hdr.icmp6_data32[0]

struct nd_router_advert {	/* router advertisement */
	struct icmp6_hdr	nd_ra_hdr;
	nd_uint32_t		nd_ra_reachable;	/* reachable time */
	nd_uint32_t		nd_ra_retransmit;	/* retransmit timer */
	/* could be followed by options */
};

#define nd_ra_type		nd_ra_hdr.icmp6_type
#define nd_ra_code		nd_ra_hdr.icmp6_code
#define nd_ra_cksum		nd_ra_hdr.icmp6_cksum
#define nd_ra_curhoplimit	nd_ra_hdr.icmp6_data8[0]
#define nd_ra_flags_reserved	nd_ra_hdr.icmp6_data8[1]
#define ND_RA_FLAG_MANAGED	0x80
#define ND_RA_FLAG_OTHER	0x40
#define ND_RA_FLAG_HOME_AGENT	0x20
#define ND_RA_FLAG_IPV6ONLY	0x02

/*
 * Router preference values based on draft-draves-ipngwg-router-selection-01.
 * These are non-standard definitions.
 */
#define ND_RA_FLAG_RTPREF_MASK	0x18 /* 00011000 */

#define ND_RA_FLAG_RTPREF_HIGH	0x08 /* 00001000 */
#define ND_RA_FLAG_RTPREF_MEDIUM	0x00 /* 00000000 */
#define ND_RA_FLAG_RTPREF_LOW	0x18 /* 00011000 */
#define ND_RA_FLAG_RTPREF_RSV	0x10 /* 00010000 */

#define nd_ra_router_lifetime	nd_ra_hdr.icmp6_data16[1]

struct nd_neighbor_solicit {	/* neighbor solicitation */
	struct icmp6_hdr	nd_ns_hdr;
	nd_ipv6			nd_ns_target;	/*target address */
	/* could be followed by options */
};

#define nd_ns_type		nd_ns_hdr.icmp6_type
#define nd_ns_code		nd_ns_hdr.icmp6_code
#define nd_ns_cksum		nd_ns_hdr.icmp6_cksum
#define nd_ns_reserved		nd_ns_hdr.icmp6_data32[0]

struct nd_neighbor_advert {	/* neighbor advertisement */
	struct icmp6_hdr	nd_na_hdr;
	nd_ipv6			nd_na_target;	/* target address */
	/* could be followed by options */
};

#define nd_na_type		nd_na_hdr.icmp6_type
#define nd_na_code		nd_na_hdr.icmp6_code
#define nd_na_cksum		nd_na_hdr.icmp6_cksum
#define nd_na_flags_reserved	nd_na_hdr.icmp6_data32[0]

#define ND_NA_FLAG_ROUTER		0x80000000
#define ND_NA_FLAG_SOLICITED		0x40000000
#define ND_NA_FLAG_OVERRIDE		0x20000000

struct nd_redirect {		/* redirect */
	struct icmp6_hdr	nd_rd_hdr;
	nd_ipv6			nd_rd_target;	/* target address */
	nd_ipv6			nd_rd_dst;	/* destination address */
	/* could be followed by options */
};

#define nd_rd_type		nd_rd_hdr.icmp6_type
#define nd_rd_code		nd_rd_hdr.icmp6_code
#define nd_rd_cksum		nd_rd_hdr.icmp6_cksum
#define nd_rd_reserved		nd_rd_hdr.icmp6_data32[0]

struct nd_opt_hdr {		/* Neighbor discovery option header */
	nd_uint8_t	nd_opt_type;
	nd_uint8_t	nd_opt_len;
	/* followed by option specific data*/
};

#define ND_OPT_SOURCE_LINKADDR		1
#define ND_OPT_TARGET_LINKADDR		2
#define ND_OPT_PREFIX_INFORMATION	3
#define ND_OPT_REDIRECTED_HEADER	4
#define ND_OPT_MTU			5
#define ND_OPT_ADVINTERVAL		7
#define ND_OPT_HOMEAGENT_INFO		8
#define ND_OPT_ROUTE_INFO		24	/* RFC4191 */
#define ND_OPT_RDNSS			25
#define ND_OPT_DNSSL			31

struct nd_opt_prefix_info {	/* prefix information */
	nd_uint8_t	nd_opt_pi_type;
	nd_uint8_t	nd_opt_pi_len;
	nd_uint8_t	nd_opt_pi_prefix_len;
	nd_uint8_t	nd_opt_pi_flags_reserved;
	nd_uint32_t	nd_opt_pi_valid_time;
	nd_uint32_t	nd_opt_pi_preferred_time;
	nd_uint32_t	nd_opt_pi_reserved2;
	nd_ipv6		nd_opt_pi_prefix;
};

#define ND_OPT_PI_FLAG_ONLINK		0x80
#define ND_OPT_PI_FLAG_AUTO		0x40
#define ND_OPT_PI_FLAG_ROUTER		0x20	/*2292bis*/

struct nd_opt_rd_hdr {         /* redirected header */
	nd_uint8_t	nd_opt_rh_type;
	nd_uint8_t	nd_opt_rh_len;
	nd_uint16_t	nd_opt_rh_reserved1;
	nd_uint32_t	nd_opt_rh_reserved2;
	/* followed by IP header and data */
};

struct nd_opt_mtu {		/* MTU option */
	nd_uint8_t	nd_opt_mtu_type;
	nd_uint8_t	nd_opt_mtu_len;
	nd_uint16_t	nd_opt_mtu_reserved;
	nd_uint32_t	nd_opt_mtu_mtu;
};

struct nd_opt_rdnss {		/* RDNSS RFC 6106 5.1 */
	nd_uint8_t	nd_opt_rdnss_type;
	nd_uint8_t	nd_opt_rdnss_len;
	nd_uint16_t	nd_opt_rdnss_reserved;
	nd_uint32_t	nd_opt_rdnss_lifetime;
	nd_ipv6		nd_opt_rdnss_addr[1];	/* variable-length */
};

struct nd_opt_dnssl {		/* DNSSL RFC 6106 5.2 */
	nd_uint8_t  nd_opt_dnssl_type;
	nd_uint8_t  nd_opt_dnssl_len;
	nd_uint16_t nd_opt_dnssl_reserved;
	nd_uint32_t nd_opt_dnssl_lifetime;
	/* followed by list of DNS search domains, variable-length */
};

struct nd_opt_advinterval {	/* Advertisement interval option */
	nd_uint8_t	nd_opt_adv_type;
	nd_uint8_t	nd_opt_adv_len;
	nd_uint16_t	nd_opt_adv_reserved;
	nd_uint32_t	nd_opt_adv_interval;
};

struct nd_opt_homeagent_info {	/* Home Agent info */
	nd_uint8_t	nd_opt_hai_type;
	nd_uint8_t	nd_opt_hai_len;
	nd_uint16_t	nd_opt_hai_reserved;
	nd_uint16_t	nd_opt_hai_preference;
	nd_uint16_t	nd_opt_hai_lifetime;
};

struct nd_opt_route_info {	/* route info */
	nd_uint8_t	nd_opt_rti_type;
	nd_uint8_t	nd_opt_rti_len;
	nd_uint8_t	nd_opt_rti_prefixlen;
	nd_uint8_t	nd_opt_rti_flags;
	nd_uint32_t	nd_opt_rti_lifetime;
	/* prefix follows */
};

/*
 * icmp6 namelookup
 */

struct icmp6_namelookup {
	struct icmp6_hdr	icmp6_nl_hdr;
	nd_byte			icmp6_nl_nonce[8];
	nd_int32_t		icmp6_nl_ttl;
#if 0
	nd_uint8_t		icmp6_nl_len;
	nd_byte			icmp6_nl_name[3];
#endif
	/* could be followed by options */
};

/*
 * icmp6 node information
 */
struct icmp6_nodeinfo {
	struct icmp6_hdr icmp6_ni_hdr;
	nd_byte icmp6_ni_nonce[8];
	/* could be followed by reply data */
};

#define ni_type		icmp6_ni_hdr.icmp6_type
#define ni_code		icmp6_ni_hdr.icmp6_code
#define ni_cksum	icmp6_ni_hdr.icmp6_cksum
#define ni_qtype	icmp6_ni_hdr.icmp6_data16[0]
#define ni_flags	icmp6_ni_hdr.icmp6_data16[1]

#define NI_QTYPE_NOOP		0 /* NOOP  */
#define NI_QTYPE_SUPTYPES	1 /* Supported Qtypes (drafts up to 09) */
#define NI_QTYPE_FQDN		2 /* FQDN (draft 04) */
#define NI_QTYPE_DNSNAME	2 /* DNS Name */
#define NI_QTYPE_NODEADDR	3 /* Node Addresses */
#define NI_QTYPE_IPV4ADDR	4 /* IPv4 Addresses */

#define NI_NODEADDR_FLAG_TRUNCATE	0x0001
#define NI_NODEADDR_FLAG_ALL		0x0002
#define NI_NODEADDR_FLAG_COMPAT		0x0004
#define NI_NODEADDR_FLAG_LINKLOCAL	0x0008
#define NI_NODEADDR_FLAG_SITELOCAL	0x0010
#define NI_NODEADDR_FLAG_GLOBAL		0x0020
#define NI_NODEADDR_FLAG_ANYCAST	0x0040 /* just experimental. not in spec */

struct ni_reply_fqdn {
	nd_uint32_t ni_fqdn_ttl;	/* TTL */
	nd_uint8_t ni_fqdn_namelen; /* length in octets of the FQDN */
	nd_byte ni_fqdn_name[3]; /* XXX: alignment */
};

/*
 * Router Renumbering. as router-renum-08.txt
 */
struct icmp6_router_renum {	/* router renumbering header */
	struct icmp6_hdr	rr_hdr;
	nd_uint8_t		rr_segnum;
	nd_uint8_t		rr_flags;
	nd_uint16_t		rr_maxdelay;
	nd_uint32_t		rr_reserved;
};
#define ICMP6_RR_FLAGS_TEST		0x80
#define ICMP6_RR_FLAGS_REQRESULT	0x40
#define ICMP6_RR_FLAGS_FORCEAPPLY	0x20
#define ICMP6_RR_FLAGS_SPECSITE		0x10
#define ICMP6_RR_FLAGS_PREVDONE		0x08

#define rr_type		rr_hdr.icmp6_type
#define rr_code		rr_hdr.icmp6_code
#define rr_cksum	rr_hdr.icmp6_cksum
#define rr_seqnum	rr_hdr.icmp6_data32[0]

struct rr_pco_match {		/* match prefix part */
	nd_uint8_t		rpm_code;
	nd_uint8_t		rpm_len;
	nd_uint8_t		rpm_ordinal;
	nd_uint8_t		rpm_matchlen;
	nd_uint8_t		rpm_minlen;
	nd_uint8_t		rpm_maxlen;
	nd_uint16_t		rpm_reserved;
	nd_ipv6			rpm_prefix;
};

#define RPM_PCO_ADD		1
#define RPM_PCO_CHANGE		2
#define RPM_PCO_SETGLOBAL	3
#define RPM_PCO_MAX		4

struct rr_pco_use {		/* use prefix part */
	nd_uint8_t	rpu_uselen;
	nd_uint8_t	rpu_keeplen;
	nd_uint8_t	rpu_ramask;
	nd_uint8_t	rpu_raflags;
	nd_uint32_t	rpu_vltime;
	nd_uint32_t	rpu_pltime;
	nd_uint32_t	rpu_flags;
	nd_ipv6		rpu_prefix;
};
#define ICMP6_RR_PCOUSE_RAFLAGS_ONLINK	0x80
#define ICMP6_RR_PCOUSE_RAFLAGS_AUTO	0x40

/* network endian */
#define ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME     ((uint32_t)htonl(0x80000000))
#define ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME     ((uint32_t)htonl(0x40000000))

struct rr_result {		/* router renumbering result message */
	nd_uint16_t	rrr_flags;
	nd_uint8_t	rrr_ordinal;
	nd_uint8_t	rrr_matchedlen;
	nd_uint32_t	rrr_ifid;
	nd_ipv6		rrr_prefix;
};
/* network endian */
#define ICMP6_RR_RESULT_FLAGS_OOB		((uint16_t)htons(0x0002))
#define ICMP6_RR_RESULT_FLAGS_FORBIDDEN		((uint16_t)htons(0x0001))

static const char *get_rtpref(u_int);
static const char *get_lifetime(uint32_t);
static void print_lladdr(netdissect_options *ndo, const u_char *, size_t);
static int icmp6_opt_print(netdissect_options *ndo, const u_char *, int);
static void mld6_print(netdissect_options *ndo, const u_char *);
static void mldv2_report_print(netdissect_options *ndo, const u_char *, u_int);
static void mldv2_query_print(netdissect_options *ndo, const u_char *, u_int);
static const struct udphdr *get_upperlayer(netdissect_options *ndo, const u_char *, u_int *);
static void dnsname_print(netdissect_options *ndo, const u_char *, const u_char *);
static void icmp6_nodeinfo_print(netdissect_options *ndo, u_int, const u_char *, const u_char *);
static void icmp6_rrenum_print(netdissect_options *ndo, const u_char *, const u_char *);

/*
 * DIO: Updated to RFC6550, as published in 2012: section 6. (page 30)
 */

#define ND_RPL_MESSAGE 155  /* 0x9B */

enum ND_RPL_CODE {
    ND_RPL_DAG_IS=0x00,
    ND_RPL_DAG_IO=0x01,
    ND_RPL_DAO   =0x02,
    ND_RPL_DAO_ACK=0x03,
    ND_RPL_SEC_DAG_IS = 0x80,
    ND_RPL_SEC_DAG_IO = 0x81,
    ND_RPL_SEC_DAG    = 0x82,
    ND_RPL_SEC_DAG_ACK= 0x83,
    ND_RPL_SEC_CONSIST= 0x8A
};

enum ND_RPL_DIO_FLAGS {
        ND_RPL_DIO_GROUNDED = 0x80,
        ND_RPL_DIO_DATRIG   = 0x40,
        ND_RPL_DIO_DASUPPORT= 0x20,
        ND_RPL_DIO_RES4     = 0x10,
        ND_RPL_DIO_RES3     = 0x08,
        ND_RPL_DIO_PRF_MASK = 0x07  /* 3-bit preference */
};

#define DAGID_LEN 16

/* section 6 of draft-ietf-roll-rpl-19 */
struct nd_rpl_security {
    nd_uint8_t  rpl_sec_t_reserved;     /* bit 7 is T-bit */
    nd_uint8_t  rpl_sec_algo;
    nd_uint16_t rpl_sec_kim_lvl_flags;  /* bit 15/14, KIM */
                                      /* bit 10-8, LVL, bit 7-0 flags */
    nd_uint32_t rpl_sec_counter;
#if 0
    nd_byte     rpl_sec_ki[0];          /* depends upon kim */
#endif
};

/* section 6.2.1, DODAG Information Solication (DIS_IS) */
struct nd_rpl_dis_is {
    nd_uint8_t rpl_dis_flags;
    nd_uint8_t rpl_dis_reserved;
#if 0
    nd_byte    rpl_dis_options[0];
#endif
};

/* section 6.3.1, DODAG Information Object (DIO) */
struct nd_rpl_dio {
    nd_uint8_t  rpl_instanceid;
    nd_uint8_t  rpl_version;
    nd_uint16_t rpl_dagrank;
    nd_uint8_t  rpl_mopprf;   /* bit 7=G, 5-3=MOP, 2-0=PRF */
    nd_uint8_t  rpl_dtsn;     /* Dest. Advertisement Trigger Sequence Number */
    nd_uint8_t  rpl_flags;    /* no flags defined yet */
    nd_uint8_t  rpl_resv1;
    nd_byte     rpl_dagid[DAGID_LEN];
};
#define RPL_DIO_GROUND_FLAG 0x80
#define RPL_DIO_MOP_SHIFT   3
#define RPL_DIO_MOP_MASK    (7 << RPL_DIO_MOP_SHIFT)
#define RPL_DIO_PRF_SHIFT   0
#define RPL_DIO_PRF_MASK    (7 << RPL_DIO_PRF_SHIFT)
#define RPL_DIO_GROUNDED(X) ((X)&RPL_DIO_GROUND_FLAG)
#define RPL_DIO_MOP(X)      (enum RPL_DIO_MOP)(((X)&RPL_DIO_MOP_MASK) >> RPL_DIO_MOP_SHIFT)
#define RPL_DIO_PRF(X)      (((X)&RPL_DIO_PRF_MASK) >> RPL_DIO_PRF_SHIFT)

enum RPL_DIO_MOP {
    RPL_DIO_NONSTORING= 0x0,
    RPL_DIO_STORING   = 0x1,
    RPL_DIO_NONSTORING_MULTICAST = 0x2,
    RPL_DIO_STORING_MULTICAST    = 0x3
};

enum RPL_SUBOPT {
        RPL_OPT_PAD1        = 0,
        RPL_OPT_PADN        = 1,
        RPL_DIO_METRICS     = 2,
        RPL_DIO_ROUTINGINFO = 3,
        RPL_DIO_CONFIG      = 4,
        RPL_DAO_RPLTARGET   = 5,
        RPL_DAO_TRANSITINFO = 6,
        RPL_DIO_DESTPREFIX  = 8,
        RPL_DAO_RPLTARGET_DESC=9
};

struct rpl_genoption {
    nd_uint8_t rpl_dio_type;
    nd_uint8_t rpl_dio_len;        /* suboption length, not including type/len */
};
#define RPL_GENOPTION_LEN	2

#define RPL_DIO_LIFETIME_INFINITE   0xffffffff
#define RPL_DIO_LIFETIME_DISCONNECT 0

struct rpl_dio_destprefix {
    nd_uint8_t rpl_dio_type;
    nd_uint8_t rpl_dio_len;
    nd_uint8_t rpl_dio_prefixlen;        /* in bits */
    nd_uint8_t rpl_dio_prf;              /* flags, including Route Preference */
    nd_uint32_t rpl_dio_prefixlifetime;  /* in seconds */
#if 0
    nd_byte     rpl_dio_prefix[0];       /* variable number of bytes */
#endif
};

/* section 6.4.1, DODAG Information Object (DIO) */
struct nd_rpl_dao {
    nd_uint8_t  rpl_instanceid;
    nd_uint8_t  rpl_flags;      /* bit 7=K, 6=D */
    nd_uint8_t  rpl_resv;
    nd_uint8_t  rpl_daoseq;
    nd_byte     rpl_dagid[DAGID_LEN];   /* present when D set. */
};
#define ND_RPL_DAO_MIN_LEN	4	/* length without DAGID */

/* indicates if this DAO is to be acK'ed */
#define RPL_DAO_K_SHIFT   7
#define RPL_DAO_K_MASK    (1 << RPL_DAO_K_SHIFT)
#define RPL_DAO_K(X)      (((X)&RPL_DAO_K_MASK) >> RPL_DAO_K_SHIFT)

/* indicates if the DAGID is present */
#define RPL_DAO_D_SHIFT   6
#define RPL_DAO_D_MASK    (1 << RPL_DAO_D_SHIFT)
#define RPL_DAO_D(X)      (((X)&RPL_DAO_D_MASK) >> RPL_DAO_D_SHIFT)

struct rpl_dao_target {
    nd_uint8_t rpl_dao_type;
    nd_uint8_t rpl_dao_len;
    nd_uint8_t rpl_dao_flags;            /* unused */
    nd_uint8_t rpl_dao_prefixlen;        /* in bits */
#if 0
    nd_byte    rpl_dao_prefix[0];        /* variable number of bytes */
#endif
};

/* section 6.5.1, Destination Advertisement Object Acknowledgement (DAO-ACK) */
struct nd_rpl_daoack {
    nd_uint8_t  rpl_instanceid;
    nd_uint8_t  rpl_flags;      /* bit 7=D */
    nd_uint8_t  rpl_daoseq;
    nd_uint8_t  rpl_status;
    nd_byte     rpl_dagid[DAGID_LEN];   /* present when D set. */
};
#define ND_RPL_DAOACK_MIN_LEN	4	/* length without DAGID */
/* indicates if the DAGID is present */
#define RPL_DAOACK_D_SHIFT   7
#define RPL_DAOACK_D_MASK    (1 << RPL_DAOACK_D_SHIFT)
#define RPL_DAOACK_D(X)      (((X)&RPL_DAOACK_D_MASK) >> RPL_DAOACK_D_SHIFT)

static const struct tok icmp6_type_values[] = {
    { ICMP6_DST_UNREACH, "destination unreachable"},
    { ICMP6_PACKET_TOO_BIG, "packet too big"},
    { ICMP6_TIME_EXCEEDED, "time exceeded in-transit"},
    { ICMP6_PARAM_PROB, "parameter problem"},
    { ICMP6_ECHO_REQUEST, "echo request"},
    { ICMP6_ECHO_REPLY, "echo reply"},
    { MLD6_LISTENER_QUERY, "multicast listener query"},
    { MLD6_LISTENER_REPORT, "multicast listener report"},
    { MLD6_LISTENER_DONE, "multicast listener done"},
    { ND_ROUTER_SOLICIT, "router solicitation"},
    { ND_ROUTER_ADVERT, "router advertisement"},
    { ND_NEIGHBOR_SOLICIT, "neighbor solicitation"},
    { ND_NEIGHBOR_ADVERT, "neighbor advertisement"},
    { ND_REDIRECT, "redirect"},
    { ICMP6_ROUTER_RENUMBERING, "router renumbering"},
    { IND_SOLICIT, "inverse neighbor solicitation"},
    { IND_ADVERT, "inverse neighbor advertisement"},
    { MLDV2_LISTENER_REPORT, "multicast listener report v2"},
    { ICMP6_HADISCOV_REQUEST, "ha discovery request"},
    { ICMP6_HADISCOV_REPLY, "ha discovery reply"},
    { ICMP6_MOBILEPREFIX_SOLICIT, "mobile router solicitation"},
    { ICMP6_MOBILEPREFIX_ADVERT, "mobile router advertisement"},
    { ICMP6_WRUREQUEST, "who-are-you request"},
    { ICMP6_WRUREPLY, "who-are-you reply"},
    { ICMP6_NI_QUERY, "node information query"},
    { ICMP6_NI_REPLY, "node information reply"},
    { MLD6_MTRACE, "mtrace message"},
    { MLD6_MTRACE_RESP, "mtrace response"},
    { ND_RPL_MESSAGE,   "RPL"},
    { 0,	NULL }
};

static const struct tok icmp6_dst_unreach_code_values[] = {
    { ICMP6_DST_UNREACH_NOROUTE, "unreachable route" },
    { ICMP6_DST_UNREACH_ADMIN, " unreachable prohibited"},
    { ICMP6_DST_UNREACH_BEYONDSCOPE, "beyond scope"},
    { ICMP6_DST_UNREACH_ADDR, "unreachable address"},
    { ICMP6_DST_UNREACH_NOPORT, "unreachable port"},
    { 0,	NULL }
};

static const struct tok icmp6_opt_pi_flag_values[] = {
    { ND_OPT_PI_FLAG_ONLINK, "onlink" },
    { ND_OPT_PI_FLAG_AUTO, "auto" },
    { ND_OPT_PI_FLAG_ROUTER, "router" },
    { 0,	NULL }
};

static const struct tok icmp6_opt_ra_flag_values[] = {
    { ND_RA_FLAG_MANAGED, "managed" },
    { ND_RA_FLAG_OTHER, "other stateful"},
    { ND_RA_FLAG_HOME_AGENT, "home agent"},
    { ND_RA_FLAG_IPV6ONLY, "ipv6 only"},
    { 0,	NULL }
};

static const struct tok icmp6_nd_na_flag_values[] = {
    { ND_NA_FLAG_ROUTER, "router" },
    { ND_NA_FLAG_SOLICITED, "solicited" },
    { ND_NA_FLAG_OVERRIDE, "override" },
    { 0,	NULL }
};

static const struct tok icmp6_opt_values[] = {
   { ND_OPT_SOURCE_LINKADDR, "source link-address"},
   { ND_OPT_TARGET_LINKADDR, "destination link-address"},
   { ND_OPT_PREFIX_INFORMATION, "prefix info"},
   { ND_OPT_REDIRECTED_HEADER, "redirected header"},
   { ND_OPT_MTU, "mtu"},
   { ND_OPT_RDNSS, "rdnss"},
   { ND_OPT_DNSSL, "dnssl"},
   { ND_OPT_ADVINTERVAL, "advertisement interval"},
   { ND_OPT_HOMEAGENT_INFO, "homeagent information"},
   { ND_OPT_ROUTE_INFO, "route info"},
   { 0,	NULL }
};

/* mldv2 report types */
static const struct tok mldv2report2str[] = {
	{ 1,	"is_in" },
	{ 2,	"is_ex" },
	{ 3,	"to_in" },
	{ 4,	"to_ex" },
	{ 5,	"allow" },
	{ 6,	"block" },
	{ 0,	NULL }
};

static const char *
get_rtpref(u_int v)
{
	static const char *rtpref_str[] = {
		"medium",		/* 00 */
		"high",			/* 01 */
		"rsv",			/* 10 */
		"low"			/* 11 */
	};

	return rtpref_str[((v & ND_RA_FLAG_RTPREF_MASK) >> 3) & 0xff];
}

static const char *
get_lifetime(uint32_t v)
{
	static char buf[20];

	if (v == (uint32_t)~0UL)
		return "infinity";
	else {
		snprintf(buf, sizeof(buf), "%us", v);
		return buf;
	}
}

static void
print_lladdr(netdissect_options *ndo, const uint8_t *p, size_t l)
{
	const uint8_t *ep, *q;

	q = p;
	ep = p + l;
	while (l > 0 && q < ep) {
		if (q > p)
                        ND_PRINT(":");
		ND_PRINT("%02x", GET_U_1(q));
		q++;
		l--;
	}
}

static uint16_t icmp6_cksum(netdissect_options *ndo, const struct ip6_hdr *ip6,
	const struct icmp6_hdr *icp, u_int len)
{
	return nextproto6_cksum(ndo, ip6, (const uint8_t *)(const void *)icp, len, len,
				IPPROTO_ICMPV6);
}

static const struct tok rpl_mop_values[] = {
        { RPL_DIO_NONSTORING,         "nonstoring"},
        { RPL_DIO_STORING,            "storing"},
        { RPL_DIO_NONSTORING_MULTICAST, "nonstoring-multicast"},
        { RPL_DIO_STORING_MULTICAST,  "storing-multicast"},
        { 0, NULL},
};

static const struct tok rpl_subopt_values[] = {
        { RPL_OPT_PAD1, "pad1"},
        { RPL_OPT_PADN, "padN"},
        { RPL_DIO_METRICS, "metrics"},
        { RPL_DIO_ROUTINGINFO, "routinginfo"},
        { RPL_DIO_CONFIG,    "config"},
        { RPL_DAO_RPLTARGET, "rpltarget"},
        { RPL_DAO_TRANSITINFO, "transitinfo"},
        { RPL_DIO_DESTPREFIX, "destprefix"},
        { RPL_DAO_RPLTARGET_DESC, "rpltargetdesc"},
        { 0, NULL},
};

static void
rpl_printopts(netdissect_options *ndo, const uint8_t *opts, u_int length)
{
	const struct rpl_genoption *opt;
	uint8_t dio_type;
	u_int optlen;

	while (length != 0) {
		opt = (const struct rpl_genoption *)opts;
		dio_type = GET_U_1(opt->rpl_dio_type);
		if (dio_type == RPL_OPT_PAD1) {
                        optlen = 1;
                        ND_PRINT(" opt:pad1");
                } else {
			if (length < RPL_GENOPTION_LEN)
				goto trunc;
	                optlen = GET_U_1(opt->rpl_dio_len)+RPL_GENOPTION_LEN;
                        ND_PRINT(" opt:%s len:%u ",
                                  tok2str(rpl_subopt_values, "subopt:%u", dio_type),
                                  optlen);
                        ND_TCHECK_LEN(opt, optlen);
                        if (length < optlen)
				goto trunc;
                        if (ndo->ndo_vflag > 2) {
                                hex_print(ndo,
                                          " ",
                                          opts + RPL_GENOPTION_LEN,  /* content of DIO option */
                                          optlen - RPL_GENOPTION_LEN);
                        }
                }
                opts += optlen;
                length -= optlen;
        }
        return;
trunc:
	nd_print_trunc(ndo);
}

static void
rpl_dio_print(netdissect_options *ndo,
              const u_char *bp, u_int length)
{
        const struct nd_rpl_dio *dio = (const struct nd_rpl_dio *)bp;

        ND_LCHECK_ZU(length, sizeof(struct nd_rpl_dio));
        ND_PRINT(" [dagid:%s,seq:%u,instance:%u,rank:%u,%smop:%s,prf:%u]",
                  GET_IP6ADDR_STRING(dio->rpl_dagid),
                  GET_U_1(dio->rpl_dtsn),
                  GET_U_1(dio->rpl_instanceid),
                  GET_BE_U_2(dio->rpl_dagrank),
                  RPL_DIO_GROUNDED(GET_U_1(dio->rpl_mopprf)) ? "grounded,":"",
                  tok2str(rpl_mop_values, "mop%u",
                          RPL_DIO_MOP(GET_U_1(dio->rpl_mopprf))),
                  RPL_DIO_PRF(GET_U_1(dio->rpl_mopprf)));

        if(ndo->ndo_vflag > 1) {
                rpl_printopts(ndo, bp + sizeof(struct nd_rpl_dio),
                              length - sizeof(struct nd_rpl_dio));
        }
        return;
invalid:
        nd_print_invalid(ndo);
}

static void
rpl_dao_print(netdissect_options *ndo,
              const u_char *bp, u_int length)
{
        const struct nd_rpl_dao *dao = (const struct nd_rpl_dao *)bp;
        const char *dagid_str = "<elided>";
        uint8_t rpl_flags;

        ND_TCHECK_SIZE(dao);
        if (length < ND_RPL_DAO_MIN_LEN)
		goto tooshort;

        bp += ND_RPL_DAO_MIN_LEN;
        length -= ND_RPL_DAO_MIN_LEN;
        rpl_flags = GET_U_1(dao->rpl_flags);
        if(RPL_DAO_D(rpl_flags)) {
                ND_TCHECK_LEN(dao->rpl_dagid, DAGID_LEN);
                if (length < DAGID_LEN)
                        goto tooshort;
                dagid_str = ip6addr_string (ndo, dao->rpl_dagid);
                bp += DAGID_LEN;
                length -= DAGID_LEN;
        }

        ND_PRINT(" [dagid:%s,seq:%u,instance:%u%s%s,flags:%02x]",
                  dagid_str,
                  GET_U_1(dao->rpl_daoseq),
                  GET_U_1(dao->rpl_instanceid),
                  RPL_DAO_K(rpl_flags) ? ",acK":"",
                  RPL_DAO_D(rpl_flags) ? ",Dagid":"",
                  rpl_flags);

        if(ndo->ndo_vflag > 1) {
                rpl_printopts(ndo, bp, length);
        }
	return;

trunc:
	nd_print_trunc(ndo);
	return;

tooshort:
	ND_PRINT(" [|length too short]");
}

static void
rpl_daoack_print(netdissect_options *ndo,
                 const u_char *bp, u_int length)
{
        const struct nd_rpl_daoack *daoack = (const struct nd_rpl_daoack *)bp;
        const char *dagid_str = "<elided>";

        ND_TCHECK_LEN(daoack, ND_RPL_DAOACK_MIN_LEN);
        if (length < ND_RPL_DAOACK_MIN_LEN)
		goto tooshort;

        bp += ND_RPL_DAOACK_MIN_LEN;
        length -= ND_RPL_DAOACK_MIN_LEN;
        if(RPL_DAOACK_D(GET_U_1(daoack->rpl_flags))) {
                ND_TCHECK_LEN(daoack->rpl_dagid, DAGID_LEN);
                if (length < DAGID_LEN)
                        goto tooshort;
                dagid_str = ip6addr_string (ndo, daoack->rpl_dagid);
                bp += DAGID_LEN;
                length -= DAGID_LEN;
        }

        ND_PRINT(" [dagid:%s,seq:%u,instance:%u,status:%u]",
                  dagid_str,
                  GET_U_1(daoack->rpl_daoseq),
                  GET_U_1(daoack->rpl_instanceid),
                  GET_U_1(daoack->rpl_status));

        /* no officially defined options for DAOACK, but print any we find */
        if(ndo->ndo_vflag > 1) {
                rpl_printopts(ndo, bp, length);
        }
	return;

trunc:
	nd_print_trunc(ndo);
	return;

tooshort:
	ND_PRINT(" [|dao-length too short]");
}

static void
rpl_print(netdissect_options *ndo,
          uint8_t icmp6_code,
          const u_char *bp, u_int length)
{
        int secured = icmp6_code & 0x80;
        int basecode= icmp6_code & 0x7f;

        if(secured) {
                ND_PRINT(", (SEC) [worktodo]");
                /* XXX
                 * the next header pointer needs to move forward to
                 * skip the secure part.
                 */
                return;
        } else {
                ND_PRINT(", (CLR)");
        }

        switch(basecode) {
        case ND_RPL_DAG_IS:
                ND_PRINT("DODAG Information Solicitation");
                if(ndo->ndo_vflag) {
                }
                break;
        case ND_RPL_DAG_IO:
                ND_PRINT("DODAG Information Object");
                if(ndo->ndo_vflag) {
                        rpl_dio_print(ndo, bp, length);
                }
                break;
        case ND_RPL_DAO:
                ND_PRINT("Destination Advertisement Object");
                if(ndo->ndo_vflag) {
                        rpl_dao_print(ndo, bp, length);
                }
                break;
        case ND_RPL_DAO_ACK:
                ND_PRINT("Destination Advertisement Object Ack");
                if(ndo->ndo_vflag) {
                        rpl_daoack_print(ndo, bp, length);
                }
                break;
        default:
                ND_PRINT("RPL message, unknown code %u",icmp6_code);
                break;
        }
	return;

#if 0
trunc:
	nd_print_trunc(ndo);
	return;
#endif

}

void
icmp6_print(netdissect_options *ndo,
            const u_char *bp, u_int length, const u_char *bp2, int fragmented)
{
	const struct icmp6_hdr *dp;
	uint8_t icmp6_type, icmp6_code;
	const struct ip6_hdr *ip;
	const struct ip6_hdr *oip;
	const struct udphdr *ouh;
	uint16_t dport;
	const u_char *ep;
	u_int prot;

	ndo->ndo_protocol = "icmp6";
	dp = (const struct icmp6_hdr *)bp;
	ip = (const struct ip6_hdr *)bp2;
	oip = (const struct ip6_hdr *)(dp + 1);
	/* 'ep' points to the end of available data. */
	ep = ndo->ndo_snapend;
	if (length == 0) {
		ND_PRINT("ICMP6, length 0");
		nd_print_invalid(ndo);
		return;
	}

	if (ndo->ndo_vflag && !fragmented) {
		uint16_t sum, udp_sum;

		if (ND_TTEST_LEN(bp, length)) {
			udp_sum = GET_BE_U_2(dp->icmp6_cksum);
			sum = icmp6_cksum(ndo, ip, dp, length);
			if (sum != 0)
				ND_PRINT("[bad icmp6 cksum 0x%04x -> 0x%04x!] ",
                                                udp_sum,
                                                in_cksum_shouldbe(udp_sum, sum));
			else
				ND_PRINT("[icmp6 sum ok] ");
		}
	}

	icmp6_type = GET_U_1(dp->icmp6_type);
	ND_PRINT("ICMP6, %s", tok2str(icmp6_type_values,"unknown icmp6 type (%u)",icmp6_type));

        /* display cosmetics: print the packet length for printer that use the vflag now */
        if (ndo->ndo_vflag && (icmp6_type == ND_ROUTER_SOLICIT ||
                      icmp6_type == ND_ROUTER_ADVERT ||
                      icmp6_type == ND_NEIGHBOR_ADVERT ||
                      icmp6_type == ND_NEIGHBOR_SOLICIT ||
                      icmp6_type == ND_REDIRECT ||
                      icmp6_type == ICMP6_HADISCOV_REPLY ||
                      icmp6_type == ICMP6_MOBILEPREFIX_ADVERT ))
                ND_PRINT(", length %u", length);

	icmp6_code = GET_U_1(dp->icmp6_code);

	switch (icmp6_type) {
	case ICMP6_DST_UNREACH:
                ND_PRINT(", %s", tok2str(icmp6_dst_unreach_code_values,"unknown unreach code (%u)",icmp6_code));
		switch (icmp6_code) {

		case ICMP6_DST_UNREACH_NOROUTE: /* fall through */
		case ICMP6_DST_UNREACH_ADMIN:
		case ICMP6_DST_UNREACH_ADDR:
                        ND_PRINT(" %s",GET_IP6ADDR_STRING(oip->ip6_dst));
                        break;
		case ICMP6_DST_UNREACH_BEYONDSCOPE:
			ND_PRINT(" %s, source address %s",
			       GET_IP6ADDR_STRING(oip->ip6_dst),
                                  GET_IP6ADDR_STRING(oip->ip6_src));
			break;
		case ICMP6_DST_UNREACH_NOPORT:
			if ((ouh = get_upperlayer(ndo, (const u_char *)oip, &prot))
			    == NULL)
				goto trunc;

			dport = GET_BE_U_2(ouh->uh_dport);
			switch (prot) {
			case IPPROTO_TCP:
				ND_PRINT(", %s tcp port %s",
					GET_IP6ADDR_STRING(oip->ip6_dst),
                                          tcpport_string(ndo, dport));
				break;
			case IPPROTO_UDP:
				ND_PRINT(", %s udp port %s",
					GET_IP6ADDR_STRING(oip->ip6_dst),
                                          udpport_string(ndo, dport));
				break;
			default:
				ND_PRINT(", %s protocol %u port %u unreachable",
					GET_IP6ADDR_STRING(oip->ip6_dst),
                                          prot, dport);
				break;
			}
			break;
		default:
                  if (ndo->ndo_vflag <= 1) {
                    print_unknown_data(ndo, bp,"\n\t",length);
                    return;
                  }
                    break;
		}
		break;
	case ICMP6_PACKET_TOO_BIG:
		ND_PRINT(", mtu %u", GET_BE_U_4(dp->icmp6_mtu));
		break;
	case ICMP6_TIME_EXCEEDED:
		switch (icmp6_code) {
		case ICMP6_TIME_EXCEED_TRANSIT:
			ND_PRINT(" for %s",
                                  GET_IP6ADDR_STRING(oip->ip6_dst));
			break;
		case ICMP6_TIME_EXCEED_REASSEMBLY:
			ND_PRINT(" (reassembly)");
			break;
		default:
                        ND_PRINT(", unknown code (%u)", icmp6_code);
			break;
		}
		break;
	case ICMP6_PARAM_PROB:
		ND_TCHECK_16(oip->ip6_dst);
		switch (icmp6_code) {
		case ICMP6_PARAMPROB_HEADER:
                        ND_PRINT(", erroneous - octet %u",
				 GET_BE_U_4(dp->icmp6_pptr));
                        break;
		case ICMP6_PARAMPROB_NEXTHEADER:
                        ND_PRINT(", next header - octet %u",
				 GET_BE_U_4(dp->icmp6_pptr));
                        break;
		case ICMP6_PARAMPROB_OPTION:
                        ND_PRINT(", option - octet %u",
				 GET_BE_U_4(dp->icmp6_pptr));
                        break;
		case ICMP6_PARAMPROB_FRAGHDRCHAIN:
                        ND_PRINT(", incomplete header chain - octet %u",
				 GET_BE_U_4(dp->icmp6_pptr));
                        break;
		default:
                        ND_PRINT(", code-#%u",
                                  icmp6_code);
                        break;
		}
		break;
	case ICMP6_ECHO_REQUEST:
	case ICMP6_ECHO_REPLY:
                ND_PRINT(", id %u, seq %u", GET_BE_U_2(dp->icmp6_id),
			 GET_BE_U_2(dp->icmp6_seq));
		break;
	case ICMP6_MEMBERSHIP_QUERY:
		if (length == MLD_MINLEN) {
			mld6_print(ndo, (const u_char *)dp);
		} else if (length >= MLDV2_MINLEN) {
			ND_PRINT(" v2");
			mldv2_query_print(ndo, (const u_char *)dp, length);
		} else {
                        ND_PRINT(" unknown-version (len %u) ", length);
		}
		break;
	case ICMP6_MEMBERSHIP_REPORT:
		mld6_print(ndo, (const u_char *)dp);
		break;
	case ICMP6_MEMBERSHIP_REDUCTION:
		mld6_print(ndo, (const u_char *)dp);
		break;
	case ND_ROUTER_SOLICIT:
#define RTSOLLEN 8
		if (ndo->ndo_vflag) {
			if (icmp6_opt_print(ndo, (const u_char *)dp + RTSOLLEN,
					    length - RTSOLLEN) == -1)
				goto trunc;
		}
		break;
	case ND_ROUTER_ADVERT:
#define RTADVLEN 16
		if (ndo->ndo_vflag) {
			const struct nd_router_advert *p;

			p = (const struct nd_router_advert *)dp;
			ND_PRINT("\n\thop limit %u, Flags [%s]"
                                  ", pref %s, router lifetime %us, reachable time %ums, retrans timer %ums",
                                  GET_U_1(p->nd_ra_curhoplimit),
                                  bittok2str(icmp6_opt_ra_flag_values,"none",GET_U_1(p->nd_ra_flags_reserved)),
                                  get_rtpref(GET_U_1(p->nd_ra_flags_reserved)),
                                  GET_BE_U_2(p->nd_ra_router_lifetime),
                                  GET_BE_U_4(p->nd_ra_reachable),
                                  GET_BE_U_4(p->nd_ra_retransmit));

			if (icmp6_opt_print(ndo, (const u_char *)dp + RTADVLEN,
					    length - RTADVLEN) == -1)
				goto trunc;
		}
		break;
	case ND_NEIGHBOR_SOLICIT:
	    {
		const struct nd_neighbor_solicit *p;
		p = (const struct nd_neighbor_solicit *)dp;
		ND_PRINT(", who has %s", GET_IP6ADDR_STRING(p->nd_ns_target));
		if (ndo->ndo_vflag) {
#define NDSOLLEN 24
			if (icmp6_opt_print(ndo, (const u_char *)dp + NDSOLLEN,
					    length - NDSOLLEN) == -1)
				goto trunc;
		}
	    }
		break;
	case ND_NEIGHBOR_ADVERT:
	    {
		const struct nd_neighbor_advert *p;

		p = (const struct nd_neighbor_advert *)dp;
		ND_PRINT(", tgt is %s",
                          GET_IP6ADDR_STRING(p->nd_na_target));
		if (ndo->ndo_vflag) {
                        ND_PRINT(", Flags [%s]",
                                  bittok2str(icmp6_nd_na_flag_values,
                                             "none",
                                             GET_BE_U_4(p->nd_na_flags_reserved)));
#define NDADVLEN 24
			if (icmp6_opt_print(ndo, (const u_char *)dp + NDADVLEN,
					    length - NDADVLEN) == -1)
				goto trunc;
#undef NDADVLEN
		}
	    }
		break;
	case ND_REDIRECT:
	    {
		const struct nd_redirect *p;

		p = (const struct nd_redirect *)dp;
		ND_PRINT(", %s", GET_IP6ADDR_STRING(p->nd_rd_dst));
		ND_PRINT(" to %s", GET_IP6ADDR_STRING(p->nd_rd_target));
#define REDIRECTLEN 40
		if (ndo->ndo_vflag) {
			if (icmp6_opt_print(ndo, (const u_char *)dp + REDIRECTLEN,
					    length - REDIRECTLEN) == -1)
				goto trunc;
#undef REDIRECTLEN
		}
	    }
		break;
	case ICMP6_ROUTER_RENUMBERING:
		icmp6_rrenum_print(ndo, bp, ep);
		break;
	case ICMP6_NI_QUERY:
	case ICMP6_NI_REPLY:
		icmp6_nodeinfo_print(ndo, length, bp, ep);
		break;
	case IND_SOLICIT:
	case IND_ADVERT:
		break;
	case ICMP6_V2_MEMBERSHIP_REPORT:
		mldv2_report_print(ndo, (const u_char *) dp, length);
		break;
	case ICMP6_MOBILEPREFIX_SOLICIT: /* fall through */
	case ICMP6_HADISCOV_REQUEST:
                ND_PRINT(", id 0x%04x", GET_BE_U_2(dp->icmp6_data16[0]));
                break;
	case ICMP6_HADISCOV_REPLY:
		if (ndo->ndo_vflag) {
			const u_char *cp;
			const u_char *p;

			ND_PRINT(", id 0x%04x",
				 GET_BE_U_2(dp->icmp6_data16[0]));
			cp = (const u_char *)dp + length;
			p = (const u_char *)(dp + 1);
			while (p < cp) {
				ND_PRINT(", %s", GET_IP6ADDR_STRING(p));
				p += 16;
			}
		}
		break;
	case ICMP6_MOBILEPREFIX_ADVERT:
		if (ndo->ndo_vflag) {
			uint16_t flags;

			ND_PRINT(", id 0x%04x",
				 GET_BE_U_2(dp->icmp6_data16[0]));
			flags = GET_BE_U_2(dp->icmp6_data16[1]);
			if (flags & 0xc000)
				ND_PRINT(" ");
			if (flags & 0x8000)
				ND_PRINT("M");
			if (flags & 0x4000)
				ND_PRINT("O");
#define MPADVLEN 8
			if (icmp6_opt_print(ndo, (const u_char *)dp + MPADVLEN,
					    length - MPADVLEN) == -1)
				goto trunc;
		}
		break;
        case ND_RPL_MESSAGE:
                /* plus 4, because struct icmp6_hdr contains 4 bytes of icmp payload */
                rpl_print(ndo, icmp6_code, dp->icmp6_data, length-sizeof(struct icmp6_hdr)+4);
                break;
	default:
                ND_PRINT(", length %u", length);
                if (ndo->ndo_vflag <= 1)
                        print_unknown_data(ndo, bp,"\n\t", length);
                return;
        }
        if (!ndo->ndo_vflag)
                ND_PRINT(", length %u", length);
	return;
trunc:
	nd_print_trunc(ndo);
}

static const struct udphdr *
get_upperlayer(netdissect_options *ndo, const u_char *bp, u_int *prot)
{
	const u_char *ep;
	const struct ip6_hdr *ip6 = (const struct ip6_hdr *)bp;
	const struct udphdr *uh;
	const struct ip6_hbh *hbh;
	const struct ip6_frag *fragh;
	const struct ah *ah;
	u_int nh;
	int hlen;

	/* 'ep' points to the end of available data. */
	ep = ndo->ndo_snapend;

	if (!ND_TTEST_1(ip6->ip6_nxt))
		return NULL;

	nh = GET_U_1(ip6->ip6_nxt);
	hlen = sizeof(struct ip6_hdr);

	while (bp < ep) {
		bp += hlen;

		switch(nh) {
		case IPPROTO_UDP:
		case IPPROTO_TCP:
			uh = (const struct udphdr *)bp;
			if (ND_TTEST_2(uh->uh_dport)) {
				*prot = nh;
				return(uh);
			}
			else
				return(NULL);
			/* NOTREACHED */

		case IPPROTO_HOPOPTS:
		case IPPROTO_DSTOPTS:
		case IPPROTO_ROUTING:
			hbh = (const struct ip6_hbh *)bp;
			if (!ND_TTEST_1(hbh->ip6h_len))
				return(NULL);
			nh = GET_U_1(hbh->ip6h_nxt);
			hlen = (GET_U_1(hbh->ip6h_len) + 1) << 3;
			break;

		case IPPROTO_FRAGMENT: /* this should be odd, but try anyway */
			fragh = (const struct ip6_frag *)bp;
			if (!ND_TTEST_2(fragh->ip6f_offlg))
				return(NULL);
			/* fragments with non-zero offset are meaningless */
			if ((GET_BE_U_2(fragh->ip6f_offlg) & IP6F_OFF_MASK) != 0)
				return(NULL);
			nh = GET_U_1(fragh->ip6f_nxt);
			hlen = sizeof(struct ip6_frag);
			break;

		case IPPROTO_AH:
			ah = (const struct ah *)bp;
			if (!ND_TTEST_1(ah->ah_len))
				return(NULL);
			nh = GET_U_1(ah->ah_nxt);
			hlen = (GET_U_1(ah->ah_len) + 2) << 2;
			break;

		default:	/* unknown or undecodable header */
			*prot = nh; /* meaningless, but set here anyway */
			return(NULL);
		}
	}

	return(NULL);		/* should be notreached, though */
}

static int
icmp6_opt_print(netdissect_options *ndo, const u_char *bp, int resid)
{
	const struct nd_opt_hdr *op;
	uint8_t opt_type;
	u_int opt_len;
	const struct nd_opt_prefix_info *opp;
	const struct nd_opt_mtu *opm;
	const struct nd_opt_rdnss *oprd;
	const struct nd_opt_dnssl *opds;
	const struct nd_opt_advinterval *opa;
	const struct nd_opt_homeagent_info *oph;
	const struct nd_opt_route_info *opri;
	const u_char *cp, *ep, *domp;
	nd_ipv6 in6;
	size_t l;
	u_int i;

	cp = bp;
	/* 'ep' points to the end of available data. */
	ep = ndo->ndo_snapend;

	while (cp < ep) {
		op = (const struct nd_opt_hdr *)cp;

		ND_TCHECK_1(op->nd_opt_len);
		if (resid <= 0)
			return 0;
		opt_type = GET_U_1(op->nd_opt_type);
		opt_len = GET_U_1(op->nd_opt_len);
		if (opt_len == 0)
			goto trunc;
		if (cp + (opt_len << 3) > ep)
			goto trunc;

                ND_PRINT("\n\t  %s option (%u), length %u (%u): ",
                          tok2str(icmp6_opt_values, "unknown", opt_type),
                          opt_type,
                          opt_len << 3,
                          opt_len);

		switch (opt_type) {
		case ND_OPT_SOURCE_LINKADDR:
			l = (opt_len << 3) - 2;
			print_lladdr(ndo, cp + 2, l);
			break;
		case ND_OPT_TARGET_LINKADDR:
			l = (opt_len << 3) - 2;
			print_lladdr(ndo, cp + 2, l);
			break;
		case ND_OPT_PREFIX_INFORMATION:
			opp = (const struct nd_opt_prefix_info *)op;
                        ND_PRINT("%s/%u%s, Flags [%s], valid time %s",
                                  GET_IP6ADDR_STRING(opp->nd_opt_pi_prefix),
                                  GET_U_1(opp->nd_opt_pi_prefix_len),
                                  (opt_len != 4) ? "badlen" : "",
                                  bittok2str(icmp6_opt_pi_flag_values, "none", GET_U_1(opp->nd_opt_pi_flags_reserved)),
                                  get_lifetime(GET_BE_U_4(opp->nd_opt_pi_valid_time)));
                        ND_PRINT(", pref. time %s",
				 get_lifetime(GET_BE_U_4(opp->nd_opt_pi_preferred_time)));
			break;
		case ND_OPT_REDIRECTED_HEADER:
                        print_unknown_data(ndo, bp,"\n\t    ",opt_len<<3);
			/* xxx */
			break;
		case ND_OPT_MTU:
			opm = (const struct nd_opt_mtu *)op;
			ND_PRINT(" %u%s",
                               GET_BE_U_4(opm->nd_opt_mtu_mtu),
                               (opt_len != 1) ? "bad option length" : "" );
                        break;
		case ND_OPT_RDNSS:
			oprd = (const struct nd_opt_rdnss *)op;
			l = (opt_len - 1) / 2;
			ND_PRINT(" lifetime %us,",
                                  GET_BE_U_4(oprd->nd_opt_rdnss_lifetime));
			for (i = 0; i < l; i++) {
				ND_PRINT(" addr: %s",
                                          GET_IP6ADDR_STRING(oprd->nd_opt_rdnss_addr[i]));
			}
			break;
		case ND_OPT_DNSSL:
			opds = (const struct nd_opt_dnssl *)op;
			ND_PRINT(" lifetime %us, domain(s):",
                                  GET_BE_U_4(opds->nd_opt_dnssl_lifetime));
			domp = cp + 8; /* domain names, variable-sized, RFC1035-encoded */
			while (domp < cp + (opt_len << 3) && GET_U_1(domp) != '\0')
			{
				ND_PRINT(" ");
				if ((domp = fqdn_print(ndo, domp, bp)) == NULL)
					goto trunc;
			}
			break;
		case ND_OPT_ADVINTERVAL:
			opa = (const struct nd_opt_advinterval *)op;
			ND_PRINT(" %ums",
				 GET_BE_U_4(opa->nd_opt_adv_interval));
			break;
                case ND_OPT_HOMEAGENT_INFO:
			oph = (const struct nd_opt_homeagent_info *)op;
			ND_PRINT(" preference %u, lifetime %u",
                                  GET_BE_U_2(oph->nd_opt_hai_preference),
                                  GET_BE_U_2(oph->nd_opt_hai_lifetime));
			break;
		case ND_OPT_ROUTE_INFO:
			opri = (const struct nd_opt_route_info *)op;
			ND_TCHECK_4(opri->nd_opt_rti_lifetime);
			memset(&in6, 0, sizeof(in6));
			switch (opt_len) {
			case 1:
				break;
			case 2:
				GET_CPY_BYTES(&in6, opri + 1, 8);
				break;
			case 3:
				GET_CPY_BYTES(&in6, opri + 1, 16);
				break;
			default:
				goto trunc;
			}
			ND_PRINT(" %s/%u", ip6addr_string(ndo, (const u_char *)&in6), /* local buffer, not packet data; don't use GET_IP6ADDR_STRING() */
                                  GET_U_1(opri->nd_opt_rti_prefixlen));
			ND_PRINT(", pref=%s",
				 get_rtpref(GET_U_1(opri->nd_opt_rti_flags)));
			ND_PRINT(", lifetime=%s",
                                  get_lifetime(GET_BE_U_4(opri->nd_opt_rti_lifetime)));
			break;
		default:
                        if (ndo->ndo_vflag <= 1) {
                                print_unknown_data(ndo,cp+2,"\n\t  ", (opt_len << 3) - 2); /* skip option header */
                            return 0;
                        }
                        break;
		}
                /* do we want to see an additional hexdump ? */
                if (ndo->ndo_vflag> 1)
                        print_unknown_data(ndo, cp+2,"\n\t    ", (opt_len << 3) - 2); /* skip option header */

		cp += opt_len << 3;
		resid -= opt_len << 3;
	}
	return 0;

trunc:
	return -1;
}

static void
mld6_print(netdissect_options *ndo, const u_char *bp)
{
	const struct mld6_hdr *mp = (const struct mld6_hdr *)bp;
	const u_char *ep;

	/* 'ep' points to the end of available data. */
	ep = ndo->ndo_snapend;

	if ((const u_char *)mp + sizeof(*mp) > ep)
		return;

	ND_PRINT("max resp delay: %u ", GET_BE_U_2(mp->mld6_maxdelay));
	ND_PRINT("addr: %s", GET_IP6ADDR_STRING(mp->mld6_addr));
}

static void
mldv2_report_print(netdissect_options *ndo, const u_char *bp, u_int len)
{
    const struct icmp6_hdr *icp = (const struct icmp6_hdr *) bp;
    u_int group, nsrcs, ngroups;
    u_int i, j;

    /* Minimum len is 8 */
    if (len < 8) {
            ND_PRINT(" [invalid len %u]", len);
            return;
    }

    ngroups = GET_BE_U_2(icp->icmp6_data16[1]);
    ND_PRINT(", %u group record(s)", ngroups);
    if (ndo->ndo_vflag > 0) {
	/* Print the group records */
	group = 8;
        for (i = 0; i < ngroups; i++) {
	    /* type(1) + auxlen(1) + numsrc(2) + grp(16) */
	    if (len < group + 20) {
                    ND_PRINT(" [invalid number of groups]");
                    return;
	    }
            ND_PRINT(" [gaddr %s", GET_IP6ADDR_STRING(bp + group + 4));
	    ND_PRINT(" %s", tok2str(mldv2report2str, " [v2-report-#%u]",
                                         GET_U_1(bp + group)));
            nsrcs = GET_BE_U_2(bp + group + 2);
	    /* Check the number of sources and print them */
	    if (len < group + 20 + (nsrcs * sizeof(nd_ipv6))) {
                    ND_PRINT(" [invalid number of sources %u]", nsrcs);
                    return;
	    }
            if (ndo->ndo_vflag == 1)
                    ND_PRINT(", %u source(s)", nsrcs);
            else {
		/* Print the sources */
                    ND_PRINT(" {");
                for (j = 0; j < nsrcs; j++) {
		    ND_PRINT(" %s", GET_IP6ADDR_STRING(bp + group + 20 + (j * sizeof(nd_ipv6))));
		}
                ND_PRINT(" }");
            }
	    /* Next group record */
            group += 20 + nsrcs * sizeof(nd_ipv6);
	    ND_PRINT("]");
        }
    }
}

static void
mldv2_query_print(netdissect_options *ndo, const u_char *bp, u_int len)
{
    const struct icmp6_hdr *icp = (const struct icmp6_hdr *) bp;
    u_int mrc;
    u_int mrt, qqi;
    u_int nsrcs;
    u_int i;

    /* Minimum len is 28 */
    if (len < 28) {
        ND_PRINT(" [invalid len %u]", len);
	return;
    }
    mrc = GET_BE_U_2(icp->icmp6_data16[0]);
    if (mrc < 32768) {
	mrt = mrc;
    } else {
        mrt = ((mrc & 0x0fff) | 0x1000) << (((mrc & 0x7000) >> 12) + 3);
    }
    if (ndo->ndo_vflag) {
            ND_PRINT(" [max resp delay=%u]", mrt);
    }
    ND_PRINT(" [gaddr %s", GET_IP6ADDR_STRING(bp + 8));

    if (ndo->ndo_vflag) {
	if (GET_U_1(bp + 24) & 0x08) {
		ND_PRINT(" sflag");
	}
	if (GET_U_1(bp + 24) & 0x07) {
		ND_PRINT(" robustness=%u", GET_U_1(bp + 24) & 0x07);
	}
	if (GET_U_1(bp + 25) < 128) {
		qqi = GET_U_1(bp + 25);
	} else {
		qqi = ((GET_U_1(bp + 25) & 0x0f) | 0x10) <<
		       (((GET_U_1(bp + 25) & 0x70) >> 4) + 3);
	}
	ND_PRINT(" qqi=%u", qqi);
    }

    nsrcs = GET_BE_U_2(bp + 26);
    if (nsrcs > 0) {
	if (len < 28 + nsrcs * sizeof(nd_ipv6))
	    ND_PRINT(" [invalid number of sources]");
	else if (ndo->ndo_vflag > 1) {
	    ND_PRINT(" {");
	    for (i = 0; i < nsrcs; i++) {
		ND_PRINT(" %s", GET_IP6ADDR_STRING(bp + 28 + (i * sizeof(nd_ipv6))));
	    }
	    ND_PRINT(" }");
	} else
                ND_PRINT(", %u source(s)", nsrcs);
    }
    ND_PRINT("]");
}

static void
dnsname_print(netdissect_options *ndo, const u_char *cp, const u_char *ep)
{
	int i;

	/* DNS name decoding - no decompression */
	ND_PRINT(", \"");
	while (cp < ep) {
		i = GET_U_1(cp);
		cp++;
		if (i) {
			if (i > ep - cp) {
				ND_PRINT("???");
				break;
			}
			while (i-- && cp < ep) {
				fn_print_char(ndo, GET_U_1(cp));
				cp++;
			}
			if (cp + 1 < ep && GET_U_1(cp))
				ND_PRINT(".");
		} else {
			if (cp == ep) {
				/* FQDN */
				ND_PRINT(".");
			} else if (cp + 1 == ep && GET_U_1(cp) == '\0') {
				/* truncated */
			} else {
				/* invalid */
				ND_PRINT("???");
			}
			break;
		}
	}
	ND_PRINT("\"");
}

static void
icmp6_nodeinfo_print(netdissect_options *ndo, u_int icmp6len, const u_char *bp, const u_char *ep)
{
	const struct icmp6_nodeinfo *ni6;
	const struct icmp6_hdr *dp;
	const u_char *cp;
	size_t siz, i;
	int needcomma;

	if (ep < bp)
		return;
	dp = (const struct icmp6_hdr *)bp;
	ni6 = (const struct icmp6_nodeinfo *)bp;
	siz = ep - bp;

	switch (GET_U_1(ni6->ni_type)) {
	case ICMP6_NI_QUERY:
		if (siz == sizeof(*dp) + 4) {
			/* KAME who-are-you */
			ND_PRINT(" who-are-you request");
			break;
		}
		ND_PRINT(" node information query");

		ND_TCHECK_LEN(dp, sizeof(*ni6));
		ni6 = (const struct icmp6_nodeinfo *)dp;
		ND_PRINT(" (");	/*)*/
		switch (GET_BE_U_2(ni6->ni_qtype)) {
		case NI_QTYPE_NOOP:
			ND_PRINT("noop");
			break;
		case NI_QTYPE_SUPTYPES:
			ND_PRINT("supported qtypes");
			i = GET_BE_U_2(ni6->ni_flags);
			if (i)
				ND_PRINT(" [%s]", (i & 0x01) ? "C" : "");
			break;
		case NI_QTYPE_FQDN:
			ND_PRINT("DNS name");
			break;
		case NI_QTYPE_NODEADDR:
			ND_PRINT("node addresses");
			i = GET_BE_U_2(ni6->ni_flags);
			if (!i)
				break;
			/* NI_NODEADDR_FLAG_TRUNCATE undefined for query */
			ND_PRINT(" [%s%s%s%s%s%s]",
			    (i & NI_NODEADDR_FLAG_ANYCAST) ? "a" : "",
			    (i & NI_NODEADDR_FLAG_GLOBAL) ? "G" : "",
			    (i & NI_NODEADDR_FLAG_SITELOCAL) ? "S" : "",
			    (i & NI_NODEADDR_FLAG_LINKLOCAL) ? "L" : "",
			    (i & NI_NODEADDR_FLAG_COMPAT) ? "C" : "",
			    (i & NI_NODEADDR_FLAG_ALL) ? "A" : "");
			break;
		default:
			ND_PRINT("unknown");
			break;
		}

		if (GET_BE_U_2(ni6->ni_qtype) == NI_QTYPE_NOOP ||
		    GET_BE_U_2(ni6->ni_qtype) == NI_QTYPE_SUPTYPES) {
			if (siz != sizeof(*ni6))
				if (ndo->ndo_vflag)
					ND_PRINT(", invalid len");
			/*(*/
			ND_PRINT(")");
			break;
		}

		/* XXX backward compat, icmp-name-lookup-03 */
		if (siz == sizeof(*ni6)) {
			ND_PRINT(", 03 draft");
			/*(*/
			ND_PRINT(")");
			break;
		}

		cp = (const u_char *)(ni6 + 1);
		switch (GET_U_1(ni6->ni_code)) {
		case ICMP6_NI_SUBJ_IPV6:
			if (!ND_TTEST_LEN(dp, sizeof(*ni6) + sizeof(nd_ipv6)))
				break;
			if (siz != sizeof(*ni6) + sizeof(nd_ipv6)) {
				if (ndo->ndo_vflag)
					ND_PRINT(", invalid subject len");
				break;
			}
			ND_PRINT(", subject=%s",
                                  GET_IP6ADDR_STRING(cp));
			break;
		case ICMP6_NI_SUBJ_FQDN:
			ND_PRINT(", subject=DNS name");
			if (GET_U_1(cp) == ep - cp - 1) {
				/* icmp-name-lookup-03, pascal string */
				if (ndo->ndo_vflag)
					ND_PRINT(", 03 draft");
				cp++;
				ND_PRINT(", \"");
				while (cp < ep) {
					fn_print_char(ndo, GET_U_1(cp));
					cp++;
				}
				ND_PRINT("\"");
			} else
				dnsname_print(ndo, cp, ep);
			break;
		case ICMP6_NI_SUBJ_IPV4:
			if (!ND_TTEST_LEN(dp, sizeof(*ni6) + sizeof(nd_ipv4)))
				break;
			if (siz != sizeof(*ni6) + sizeof(nd_ipv4)) {
				if (ndo->ndo_vflag)
					ND_PRINT(", invalid subject len");
				break;
			}
			ND_PRINT(", subject=%s",
                                  GET_IPADDR_STRING(cp));
			break;
		default:
			ND_PRINT(", unknown subject");
			break;
		}

		/*(*/
		ND_PRINT(")");
		break;

	case ICMP6_NI_REPLY:
		if (icmp6len > siz)
			goto trunc;

		needcomma = 0;

		ND_TCHECK_LEN(dp, sizeof(*ni6));
		ni6 = (const struct icmp6_nodeinfo *)dp;
		ND_PRINT(" node information reply");
		ND_PRINT(" (");	/*)*/
		switch (GET_U_1(ni6->ni_code)) {
		case ICMP6_NI_SUCCESS:
			if (ndo->ndo_vflag) {
				ND_PRINT("success");
				needcomma++;
			}
			break;
		case ICMP6_NI_REFUSED:
			ND_PRINT("refused");
			needcomma++;
			if (siz != sizeof(*ni6))
				if (ndo->ndo_vflag)
					ND_PRINT(", invalid length");
			break;
		case ICMP6_NI_UNKNOWN:
			ND_PRINT("unknown");
			needcomma++;
			if (siz != sizeof(*ni6))
				if (ndo->ndo_vflag)
					ND_PRINT(", invalid length");
			break;
		}

		if (GET_U_1(ni6->ni_code) != ICMP6_NI_SUCCESS) {
			/*(*/
			ND_PRINT(")");
			break;
		}

		switch (GET_BE_U_2(ni6->ni_qtype)) {
		case NI_QTYPE_NOOP:
			if (needcomma)
				ND_PRINT(", ");
			ND_PRINT("noop");
			if (siz != sizeof(*ni6))
				if (ndo->ndo_vflag)
					ND_PRINT(", invalid length");
			break;
		case NI_QTYPE_SUPTYPES:
			if (needcomma)
				ND_PRINT(", ");
			ND_PRINT("supported qtypes");
			i = GET_BE_U_2(ni6->ni_flags);
			if (i)
				ND_PRINT(" [%s]", (i & 0x01) ? "C" : "");
			break;
		case NI_QTYPE_FQDN:
			if (needcomma)
				ND_PRINT(", ");
			ND_PRINT("DNS name");
			cp = (const u_char *)(ni6 + 1) + 4;
			if (GET_U_1(cp) == ep - cp - 1) {
				/* icmp-name-lookup-03, pascal string */
				if (ndo->ndo_vflag)
					ND_PRINT(", 03 draft");
				cp++;
				ND_PRINT(", \"");
				while (cp < ep) {
					fn_print_char(ndo, GET_U_1(cp));
					cp++;
				}
				ND_PRINT("\"");
			} else
				dnsname_print(ndo, cp, ep);
			if ((GET_BE_U_2(ni6->ni_flags) & 0x01) != 0)
				ND_PRINT(" [TTL=%u]", GET_BE_U_4(ni6 + 1));
			break;
		case NI_QTYPE_NODEADDR:
			if (needcomma)
				ND_PRINT(", ");
			ND_PRINT("node addresses");
			i = sizeof(*ni6);
			while (i < siz) {
				if (i + sizeof(uint32_t) + sizeof(nd_ipv6) > siz)
					break;
				ND_PRINT(" %s(%u)",
				    GET_IP6ADDR_STRING(bp + i + sizeof(uint32_t)),
				    GET_BE_U_4(bp + i));
				i += sizeof(uint32_t) + sizeof(nd_ipv6);
			}
			i = GET_BE_U_2(ni6->ni_flags);
			if (!i)
				break;
			ND_PRINT(" [%s%s%s%s%s%s%s]",
                                  (i & NI_NODEADDR_FLAG_ANYCAST) ? "a" : "",
                                  (i & NI_NODEADDR_FLAG_GLOBAL) ? "G" : "",
                                  (i & NI_NODEADDR_FLAG_SITELOCAL) ? "S" : "",
                                  (i & NI_NODEADDR_FLAG_LINKLOCAL) ? "L" : "",
                                  (i & NI_NODEADDR_FLAG_COMPAT) ? "C" : "",
                                  (i & NI_NODEADDR_FLAG_ALL) ? "A" : "",
                                  (i & NI_NODEADDR_FLAG_TRUNCATE) ? "T" : "");
			break;
		default:
			if (needcomma)
				ND_PRINT(", ");
			ND_PRINT("unknown");
			break;
		}

		/*(*/
		ND_PRINT(")");
		break;
	}
	return;

trunc:
	nd_print_trunc(ndo);
}

static void
icmp6_rrenum_print(netdissect_options *ndo, const u_char *bp, const u_char *ep)
{
	const struct icmp6_router_renum *rr6;
	const char *cp;
	const struct rr_pco_match *match;
	const struct rr_pco_use *use;
	char hbuf[NI_MAXHOST];
	int n;

	if (ep < bp)
		return;
	rr6 = (const struct icmp6_router_renum *)bp;
	cp = (const char *)(rr6 + 1);

	ND_TCHECK_4(rr6->rr_reserved);
	switch (GET_U_1(rr6->rr_code)) {
	case ICMP6_ROUTER_RENUMBERING_COMMAND:
		ND_PRINT(", command");
		break;
	case ICMP6_ROUTER_RENUMBERING_RESULT:
		ND_PRINT(", result");
		break;
	case ICMP6_ROUTER_RENUMBERING_SEQNUM_RESET:
		ND_PRINT(", sequence number reset");
		break;
	default:
		ND_PRINT(", code-#%u", GET_U_1(rr6->rr_code));
		break;
	}

        ND_PRINT(", seq=%u", GET_BE_U_4(rr6->rr_seqnum));

	if (ndo->ndo_vflag) {
		uint8_t rr_flags = GET_U_1(rr6->rr_flags);
#define F(x, y)	(rr_flags & (x) ? (y) : "")
		ND_PRINT("[");	/*]*/
		if (rr_flags) {
			ND_PRINT("%s%s%s%s%s,", F(ICMP6_RR_FLAGS_TEST, "T"),
                                  F(ICMP6_RR_FLAGS_REQRESULT, "R"),
                                  F(ICMP6_RR_FLAGS_FORCEAPPLY, "A"),
                                  F(ICMP6_RR_FLAGS_SPECSITE, "S"),
                                  F(ICMP6_RR_FLAGS_PREVDONE, "P"));
		}
                ND_PRINT("seg=%u,", GET_U_1(rr6->rr_segnum));
                ND_PRINT("maxdelay=%u", GET_BE_U_2(rr6->rr_maxdelay));
		if (GET_BE_U_4(rr6->rr_reserved))
			ND_PRINT("rsvd=0x%x", GET_BE_U_4(rr6->rr_reserved));
		/*[*/
		ND_PRINT("]");
#undef F
	}

	if (GET_U_1(rr6->rr_code) == ICMP6_ROUTER_RENUMBERING_COMMAND) {
		match = (const struct rr_pco_match *)cp;
		cp = (const char *)(match + 1);

		ND_TCHECK_16(match->rpm_prefix);

		if (ndo->ndo_vflag > 1)
			ND_PRINT("\n\t");
		else
			ND_PRINT(" ");
		ND_PRINT("match(");	/*)*/
		switch (GET_U_1(match->rpm_code)) {
		case RPM_PCO_ADD:	ND_PRINT("add"); break;
		case RPM_PCO_CHANGE:	ND_PRINT("change"); break;
		case RPM_PCO_SETGLOBAL:	ND_PRINT("setglobal"); break;
		default:		ND_PRINT("#%u",
						 GET_U_1(match->rpm_code)); break;
		}

		if (ndo->ndo_vflag) {
			ND_PRINT(",ord=%u", GET_U_1(match->rpm_ordinal));
			ND_PRINT(",min=%u", GET_U_1(match->rpm_minlen));
			ND_PRINT(",max=%u", GET_U_1(match->rpm_maxlen));
		}
		if (addrtostr6(match->rpm_prefix, hbuf, sizeof(hbuf)))
			ND_PRINT(",%s/%u", hbuf, GET_U_1(match->rpm_matchlen));
		else
			ND_PRINT(",?/%u", GET_U_1(match->rpm_matchlen));
		/*(*/
		ND_PRINT(")");

		n = GET_U_1(match->rpm_len) - 3;
		if (n % 4)
			goto trunc;
		n /= 4;
		while (n-- > 0) {
			use = (const struct rr_pco_use *)cp;
			cp = (const char *)(use + 1);

			ND_TCHECK_16(use->rpu_prefix);

			if (ndo->ndo_vflag > 1)
				ND_PRINT("\n\t");
			else
				ND_PRINT(" ");
			ND_PRINT("use(");	/*)*/
			if (GET_U_1(use->rpu_flags)) {
#define F(x, y)	(GET_U_1(use->rpu_flags) & (x) ? (y) : "")
				ND_PRINT("%s%s,",
                                          F(ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME, "V"),
                                          F(ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME, "P"));
#undef F
			}
			if (ndo->ndo_vflag) {
				ND_PRINT("mask=0x%x,",
					 GET_U_1(use->rpu_ramask));
				ND_PRINT("raflags=0x%x,",
					 GET_U_1(use->rpu_raflags));
				if (GET_BE_U_4(use->rpu_vltime) == 0xffffffff)
					ND_PRINT("vltime=infty,");
				else
					ND_PRINT("vltime=%u,",
                                                  GET_BE_U_4(use->rpu_vltime));
				if (GET_BE_U_4(use->rpu_pltime) == 0xffffffff)
					ND_PRINT("pltime=infty,");
				else
					ND_PRINT("pltime=%u,",
                                                  GET_BE_U_4(use->rpu_pltime));
			}
			if (addrtostr6(use->rpu_prefix, hbuf, sizeof(hbuf)))
				ND_PRINT("%s/%u/%u", hbuf,
                                          GET_U_1(use->rpu_uselen),
                                          GET_U_1(use->rpu_keeplen));
			else
				ND_PRINT("?/%u/%u", GET_U_1(use->rpu_uselen),
                                          GET_U_1(use->rpu_keeplen));
			/*(*/
                        ND_PRINT(")");
		}
	}

	return;

trunc:
	nd_print_trunc(ndo);
}