aboutsummaryrefslogtreecommitdiffstats
path: root/packet-isis-lsp.c
blob: b239d8438f1331d5b090897b464d68d3f6cdcee2 (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
/* packet-isis-lsp.c
 * Routines for decoding isis lsp packets and their CLVs
 *
 * $Id: packet-isis-lsp.c,v 1.46 2003/12/08 20:40:33 guy Exp $
 * Stuart Stanley <stuarts@mxmail.net>
 *
 * Ethereal - Network traffic analyzer
 * By Gerald Combs <gerald@ethereal.com>
 * Copyright 1998 Gerald Combs
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

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

#include "epan/ipv4.h"
#include <epan/packet.h>
#include "packet-osi.h"
#include "packet-ipv6.h"
#include "packet-isis.h"
#include "packet-isis-clv.h"
#include "packet-isis-lsp.h"
#include <epan/resolv.h>

/* lsp packets */
static int hf_isis_lsp_pdu_length = -1;
static int hf_isis_lsp_remaining_life = -1;
static int hf_isis_lsp_sequence_number = -1;
static int hf_isis_lsp_checksum = -1;
static int hf_isis_lsp_checksum_bad = -1;
static int hf_isis_lsp_clv_ipv4_int_addr = -1;
static int hf_isis_lsp_clv_ipv6_int_addr = -1;
static int hf_isis_lsp_clv_te_router_id = -1;
static int hf_isis_lsp_clv_mt = -1;
static int hf_isis_lsp_p = -1;
static int hf_isis_lsp_att = -1;
static int hf_isis_lsp_hippity = -1;
static int hf_isis_lsp_is_type = -1;

static gint ett_isis_lsp = -1;
static gint ett_isis_lsp_info = -1;
static gint ett_isis_lsp_att = -1;
static gint ett_isis_lsp_clv_area_addr = -1;
static gint ett_isis_lsp_clv_is_neighbors = -1;
static gint ett_isis_lsp_clv_ext_is_reachability = -1; /* CLV 22 */
static gint ett_isis_lsp_part_of_clv_ext_is_reachability = -1;
static gint ett_isis_lsp_subclv_admin_group = -1;
static gint ett_isis_lsp_subclv_unrsv_bw = -1;
static gint ett_isis_lsp_clv_unknown = -1;
static gint ett_isis_lsp_clv_partition_dis = -1;
static gint ett_isis_lsp_clv_prefix_neighbors = -1;
static gint ett_isis_lsp_clv_nlpid = -1;
static gint ett_isis_lsp_clv_hostname = -1;
static gint ett_isis_lsp_clv_te_router_id = -1;
static gint ett_isis_lsp_clv_authentication = -1;
static gint ett_isis_lsp_clv_ip_authentication = -1;
static gint ett_isis_lsp_clv_ipv4_int_addr = -1;
static gint ett_isis_lsp_clv_ipv6_int_addr = -1; /* CLV 232 */
static gint ett_isis_lsp_clv_ip_reachability = -1;
static gint ett_isis_lsp_clv_ip_reach_subclv = -1;
static gint ett_isis_lsp_clv_ext_ip_reachability = -1; /* CLV 135 */
static gint ett_isis_lsp_part_of_clv_ext_ip_reachability = -1;
static gint ett_isis_lsp_clv_ipv6_reachability = -1; /* CLV 236 */
static gint ett_isis_lsp_part_of_clv_ipv6_reachability = -1;
static gint ett_isis_lsp_clv_mt = -1;
static gint ett_isis_lsp_clv_mt_is = -1;
static gint ett_isis_lsp_part_of_clv_mt_is = -1;
static gint ett_isis_lsp_clv_mt_reachable_IPv4_prefx = -1;  /* CLV 235 */
static gint ett_isis_lsp_clv_mt_reachable_IPv6_prefx = -1;  /* CLV 237 */

static const value_string isis_lsp_istype_vals[] = {
	{ ISIS_LSP_TYPE_UNUSED0,	"Unused 0x0 (invalid)"},
	{ ISIS_LSP_TYPE_LEVEL_1,	"Level 1"},
	{ ISIS_LSP_TYPE_UNUSED2,	"Unused 0x2 (invalid)"},
	{ ISIS_LSP_TYPE_LEVEL_2,	"Level 2"},
	{ 0, NULL } };

static const true_false_string supported_string = {
		"Supported",
		"Unsupported"
	};

static const true_false_string hippity_string = {
		"Set",
		"Unset"
	};


/*
 * Predclare dissectors for use in clv dissection.
 */
static void dissect_lsp_prefix_neighbors_clv(tvbuff_t *tvb,
	proto_tree *tree, int offset, int id_length, int length);
static void dissect_lsp_partition_dis_clv(tvbuff_t *tvb,
	proto_tree *tree, int offset, int id_length, int length);
static void dissect_lsp_mt_is_reachability_clv(tvbuff_t *tvb,
	proto_tree *tree, int offset, int id_length, int length);
static void dissect_lsp_ext_is_reachability_clv(tvbuff_t *tvb,
	proto_tree *tree, int offset, int id_length, int length);
static void dissect_lsp_l2_is_neighbors_clv(tvbuff_t *tvb,
	proto_tree *tree, int offset, int id_length, int length);
static void dissect_lsp_l1_es_neighbors_clv(tvbuff_t *tvb,
	proto_tree *tree, int offset, int id_length, int length);
static void dissect_lsp_l1_is_neighbors_clv(tvbuff_t *tvb,
	proto_tree *tree, int offset, int id_length, int length);
static void dissect_lsp_area_address_clv(tvbuff_t *tvb,
	proto_tree *tree, int offset, int id_length, int length);
static void dissect_lsp_authentication_clv(tvbuff_t *tvb,
	proto_tree *tree, int offset, int id_length, int length);
static void dissect_lsp_ip_authentication_clv(tvbuff_t *tvb,
	proto_tree *tree, int offset, int id_length, int length);
static void dissect_lsp_ipv6_int_addr_clv(tvbuff_t *tvb,
	proto_tree *tree, int offset, int id_length, int length);
static void dissect_lsp_ip_int_addr_clv(tvbuff_t *tvb,
	proto_tree *tree, int offset, int id_length, int length);
static void dissect_lsp_te_router_id_clv(tvbuff_t *tvb,
	proto_tree *tree, int offset, int id_length, int length);
static void dissect_lsp_hostname_clv(tvbuff_t *tvb,
	proto_tree *tree, int offset, int id_length, int length);
static void dissect_lsp_mt_clv(tvbuff_t *tvb,
	proto_tree *tree, int offset, int id_length, int length);
static void dissect_lsp_nlpid_clv(tvbuff_t *tvb,
	proto_tree *tree, int offset, int id_length, int length);
static void dissect_lsp_ipv6_reachability_clv(tvbuff_t *tvb,
	proto_tree *tree, int offset, int id_length, int length);
static void dissect_lsp_ext_ip_reachability_clv(tvbuff_t *tvb,
	proto_tree *tree, int offset, int id_length, int length);
static void dissect_lsp_ip_reachability_clv(tvbuff_t *tvb,
	proto_tree *tree, int offset, int id_length, int length);
static void dissect_ipreach_subclv(tvbuff_t *tvb,
        proto_tree *tree, int offset, int clv_code, int clv_len);
static void dissect_lsp_mt_reachable_IPv4_prefx_clv(tvbuff_t *tvb,
        proto_tree *tree, int offset, int id_length, int length);
static void dissect_lsp_mt_reachable_IPv6_prefx_clv(tvbuff_t *tvb,
        proto_tree *tree, int offset, int id_length, int length);


static const isis_clv_handle_t clv_l1_lsp_opts[] = {
	{
		ISIS_CLV_AREA_ADDRESS,
		"Area address(es)",
		&ett_isis_lsp_clv_area_addr,
		dissect_lsp_area_address_clv
	},
	{
		ISIS_CLV_IS_REACH,
		"IS Reachability",
		&ett_isis_lsp_clv_is_neighbors,
		dissect_lsp_l1_is_neighbors_clv
	},
	{
		ISIS_CLV_ES_NEIGHBORS,
		"ES Neighbor(s)",
		&ett_isis_lsp_clv_is_neighbors,
		dissect_lsp_l1_es_neighbors_clv
	},
	{
		ISIS_CLV_EXTD_IS_REACH,
		"Extended IS reachability",
		&ett_isis_lsp_clv_ext_is_reachability,
		dissect_lsp_ext_is_reachability_clv
	},
	{
		ISIS_CLV_INT_IP_REACH,
		"IP Internal reachability",
		&ett_isis_lsp_clv_ip_reachability,
		dissect_lsp_ip_reachability_clv
	},
	{
		ISIS_CLV_EXT_IP_REACH,
		"IP External reachability",
		&ett_isis_lsp_clv_ip_reachability,
		dissect_lsp_ip_reachability_clv
	},
	{
		ISIS_CLV_EXTD_IP_REACH,
		"Extended IP Reachability",
		&ett_isis_lsp_clv_ext_ip_reachability,
		dissect_lsp_ext_ip_reachability_clv
	},
	{
		ISIS_CLV_IP6_REACH,
		"IPv6 reachability",
		&ett_isis_lsp_clv_ipv6_reachability,
		dissect_lsp_ipv6_reachability_clv
	},
	{
		ISIS_CLV_PROTOCOLS_SUPPORTED,
		"Protocols supported",
		&ett_isis_lsp_clv_nlpid,
		dissect_lsp_nlpid_clv
	},
        {
                ISIS_CLV_HOSTNAME,
                "Hostname",
                &ett_isis_lsp_clv_hostname,
                dissect_lsp_hostname_clv
        },
        {
                ISIS_CLV_TE_ROUTER_ID,
                "Traffic Engineering Router ID",
                &ett_isis_lsp_clv_te_router_id,
                dissect_lsp_te_router_id_clv
        },
	{
		ISIS_CLV_IP_ADDR,
		"IP Interface address(es)",
		&ett_isis_lsp_clv_ipv4_int_addr,
		dissect_lsp_ip_int_addr_clv
	},
	{
		ISIS_CLV_IP6_ADDR,
		"IPv6 Interface address(es)",
		&ett_isis_lsp_clv_ipv6_int_addr,
		dissect_lsp_ipv6_int_addr_clv
	},
	{
		ISIS_CLV_AUTHENTICATION,
		"Authentication",
		&ett_isis_lsp_clv_authentication,
		dissect_lsp_authentication_clv
	},
	{
		ISIS_CLV_IP_AUTHENTICATION,
		"IP Authentication",
		&ett_isis_lsp_clv_ip_authentication,
		dissect_lsp_ip_authentication_clv
	},
	{
		ISIS_CLV_MT_SUPPORTED,
		"Multi Topology supported",
		&ett_isis_lsp_clv_mt,
		dissect_lsp_mt_clv
	},
	{
		ISIS_CLV_MT_IS_REACH,
		"Multi Topology IS Reachability",
		&ett_isis_lsp_clv_mt_is,
		dissect_lsp_mt_is_reachability_clv
	},
	{
		ISIS_CLV_MT_IP_REACH,
		"Multi Topology Reachable IPv4 Prefixes",
		&ett_isis_lsp_clv_mt_reachable_IPv4_prefx,
		dissect_lsp_mt_reachable_IPv4_prefx_clv
	},
	{
		ISIS_CLV_MT_IP6_REACH,
		"Multi Topology Reachable IPv6 Prefixes",
		&ett_isis_lsp_clv_mt_reachable_IPv6_prefx,
		dissect_lsp_mt_reachable_IPv6_prefx_clv
	},
	{
		0,
		"",
		NULL,
		NULL
	}
};

static const isis_clv_handle_t clv_l2_lsp_opts[] = {
	{
		ISIS_CLV_AREA_ADDRESS,
		"Area address(es)",
		&ett_isis_lsp_clv_area_addr,
		dissect_lsp_area_address_clv
	},
	{
		ISIS_CLV_IS_REACH,
		"IS Reachability",
		&ett_isis_lsp_clv_is_neighbors,
		dissect_lsp_l2_is_neighbors_clv
	},
	{
		ISIS_CLV_EXTD_IS_REACH,
		"Extended IS reachability",
		&ett_isis_lsp_clv_ext_is_reachability,
		dissect_lsp_ext_is_reachability_clv
	},
	{
		ISIS_CLV_PARTITION_DIS,
		"Parition Designated Level 2 IS",
		&ett_isis_lsp_clv_partition_dis,
		dissect_lsp_partition_dis_clv
	},
	{
		ISIS_CLV_PREFIX_NEIGHBORS,
		"Prefix neighbors",
		&ett_isis_lsp_clv_prefix_neighbors,
		dissect_lsp_prefix_neighbors_clv
	},
	{
		ISIS_CLV_INT_IP_REACH,
		"IP Internal reachability",
		&ett_isis_lsp_clv_ip_reachability,
		dissect_lsp_ip_reachability_clv
	},
	{
		ISIS_CLV_EXT_IP_REACH,
		"IP External reachability",
		&ett_isis_lsp_clv_ip_reachability,
		dissect_lsp_ip_reachability_clv
	},
	{
		ISIS_CLV_PROTOCOLS_SUPPORTED,
		"Protocols supported",
		&ett_isis_lsp_clv_nlpid,
		dissect_lsp_nlpid_clv
	},
        {
                ISIS_CLV_HOSTNAME,
                "Hostname",
                &ett_isis_lsp_clv_hostname,
                dissect_lsp_hostname_clv
        },
        {
                ISIS_CLV_TE_ROUTER_ID,
                "Traffic Engineering Router ID",
                &ett_isis_lsp_clv_te_router_id,
                dissect_lsp_te_router_id_clv
        },
	{
		ISIS_CLV_EXTD_IP_REACH,
		"Extended IP Reachability",
		&ett_isis_lsp_clv_ext_ip_reachability,
		dissect_lsp_ext_ip_reachability_clv
	},
	{
		ISIS_CLV_IP6_REACH,
		"IPv6 reachability",
		&ett_isis_lsp_clv_ipv6_reachability,
		dissect_lsp_ipv6_reachability_clv
	},
	{
		ISIS_CLV_IP_ADDR,
		"IP Interface address(es)",
		&ett_isis_lsp_clv_ipv4_int_addr,
		dissect_lsp_ip_int_addr_clv
	},
	{
		ISIS_CLV_IP6_ADDR,
		"IPv6 Interface address(es)",
		&ett_isis_lsp_clv_ipv6_int_addr,
		dissect_lsp_ipv6_int_addr_clv
	},
	{
		ISIS_CLV_AUTHENTICATION,
		"Authentication",
		&ett_isis_lsp_clv_authentication,
		dissect_lsp_authentication_clv
	},
	{
		ISIS_CLV_IP_AUTHENTICATION,
		"IP Authentication",
		&ett_isis_lsp_clv_ip_authentication,
		dissect_lsp_ip_authentication_clv
	},
	{
		ISIS_CLV_MT_SUPPORTED,
		"Multi Topology",
		&ett_isis_lsp_clv_mt,
		dissect_lsp_mt_clv
	},
	{
		ISIS_CLV_MT_IS_REACH,
		"Multi Topology IS Reachability",
		&ett_isis_lsp_clv_mt_is,
		dissect_lsp_mt_is_reachability_clv
	},
	{
		ISIS_CLV_MT_IP_REACH,
		"Multi Topology Reachable IPv4 Prefixes",
		&ett_isis_lsp_clv_mt_reachable_IPv4_prefx,
		dissect_lsp_mt_reachable_IPv4_prefx_clv
	},
	{
		ISIS_CLV_MT_IP6_REACH,
		"Multi Topology Reachable IPv6 Prefixes",
		&ett_isis_lsp_clv_mt_reachable_IPv6_prefx,
		dissect_lsp_mt_reachable_IPv6_prefx_clv
	},
	{
		0,
		"",
		NULL,
		NULL
	}
};

/*
 * Name: dissect_lsp_mt_id()
 *
 * Description:
 *	dissect and display the multi-topology ID value
 *
 * Input:
 *	tvbuff_t * : tvbuffer for packet data
 *	proto_tree * : protocol display tree to fill out.  CAN'T BE NULL
 *	int : offset into packet data where we are.
 *
 * Output:
 *	void, but we will add to proto tree.
 */
static void
dissect_lsp_mt_id(tvbuff_t *tvb, proto_tree *tree, int offset)
{
	int  mt_block, mt_id;
	char mt_desc[60];

	/* fetch two bytes */
	mt_block = tvb_get_ntohs(tvb, offset);

	proto_tree_add_text ( tree, tvb, offset, 1 ,
                        "4 most significant bits reserved, should be set to 0 (%d)", ISIS_LSP_MT_MSHIP_RES(mt_block));

	mt_id = ISIS_LSP_MT_MSHIP_ID(mt_block);
	/*mask out the lower 12 bits */
	switch(mt_id) {
	case 0:
		strcpy(mt_desc,"'standard' topology");
		break;
	case 1:
		strcpy(mt_desc,"IPv4 In-Band Management purposes");
		break;
	case 2:
		strcpy(mt_desc,"IPv6 routing topology");
		break;
	case 3:
		strcpy(mt_desc,"IPv4 multicast routing topology");
		break;
	case 4:
		strcpy(mt_desc,"IPv6 multicast routing topology");
		break;
	default:
		strcpy(mt_desc,((mt_block & 0x0fff) < 3996) ? "Reserved for IETF Consensus" : "Development, Experimental and Proprietary features");
	}

	proto_tree_add_text ( tree, tvb, offset, 2 ,
                        "%s (%d)", mt_desc, mt_id);

}

/*
 * Name: dissect_metric()
 *
 * Description:
 *	Display a metric prefix portion.  ISIS has the concept of multple
 *	metric per prefix (default, delay, expense, and error).  This
 *	routine assists other dissectors by adding a single one of
 *	these to the display tree..
 *
 *	The 8th(msbit) bit in the metric octet is the "supported" bit.  The
 *		"default" support is required, so we support a "force_supported"
 *		flag that tells us that it MUST be zero (zero==supported,
 *		so it really should be a "not supported" in the boolean sense)
 *		and to display a protocol failure accordingly.  Notably,
 *		Cisco IOS 12(6) blows this!
 *	The 7th bit must be zero (reserved).
 *
 * Input:
 *	tvbuff_t * : tvbuffer for packet data
 *	proto_tree * : protocol display tree to fill out.  May be NULL
 *	int : offset into packet data where we are.
 *	guint8 : value of the metric.
 *	char * : string giving type of the metric.
 *	int : force supported.  True is the supported bit MUST be zero.
 *
 * Output:
 *	void, but we will add to proto tree if !NULL.
 */
static void
dissect_metric(tvbuff_t *tvb, proto_tree *tree,	int offset, guint8 value,
	char *pstr, int force_supported )
{
	int s;

	if ( !tree ) return;

	s = ISIS_LSP_CLV_METRIC_SUPPORTED(value);
	proto_tree_add_text(tree, tvb, offset, 1,
		"%s Metric: %s%s %s%d:%d", pstr,
		s ? "Not supported" : "Supported",
		(s && force_supported) ? "(but is required to be)":"",
		ISIS_LSP_CLV_METRIC_RESERVED(value) ? "(reserved bit != 0)":"",
		ISIS_LSP_CLV_METRIC_VALUE(value), value );
}

/*
 * Name: dissect_lsp_ip_reachability_clv()
 *
 * Description:
 *	Decode an IP reachability CLV.  This can be either internal or
 *	external (the clv format does not change and which type we are
 *	displaying is put there by the dispatcher).  All of these
 *	are a metric block followed by an IP addr and mask.
 *
 * Input:
 *	tvbuff_t * : tvbuffer for packet data
 *	proto_tree * : proto tree to build on (may be null)
 *	int : current offset into packet data
 *	int : length of IDs in packet.
 *	int : length of this clv
 *
 * Output:
 *	void, will modify proto_tree if not null.
 */
static void
dissect_lsp_ip_reachability_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
	int id_length _U_, int length)
{
	proto_item 	*ti;
	proto_tree	*ntree = NULL;
	guint32		src, mask, prefix_len;

        guint32 bitmasks[33] = {
	  0x00000000,
	  0x00000008, 0x0000000c, 0x0000000e, 0x0000000f,
	  0x000000f8, 0x000000fc, 0x000000fe, 0x000000ff,
	  0x000008ff, 0x00000cff, 0x00000eff, 0x00000fff,
	  0x0000f8ff, 0x0000fcff, 0x0000feff, 0x0000ffff,
	  0x0008ffff, 0x000cffff, 0x000effff, 0x000fffff,
	  0x00f8ffff, 0x00fcffff, 0x00feffff, 0x00ffffff,
	  0x08ffffff, 0x0cffffff, 0x0effffff, 0x0fffffff,
	  0xf8ffffff, 0xfcffffff, 0xfeffffff, 0xffffffff
	};


	while ( length > 0 ) {
		if (length<12) {
			isis_dissect_unknown(tvb, tree, offset,
				"short IP reachability (%d vs 12)", length );
			return;
		}
		/*
		 * Gotta build a sub-tree for all our pieces
		 */
		if ( tree ) {
			tvb_memcpy(tvb, (guint8 *)&src, offset+4, 4);
			tvb_memcpy(tvb, (guint8 *)&mask, offset+8, 4);

			/* find out if the mask matches one of 33 possible prefix lengths */

			prefix_len=0;

			while(prefix_len<=33) {
			  if (bitmasks[prefix_len++]==mask) {
			    prefix_len--;
			    break;
			  }
			}

			/* 34 indicates no match -> must be a discontiguous netmask
			   lets dump the mask, otherwise print the prefix_len */

			if(prefix_len==34) {
			  ti = proto_tree_add_text ( tree, tvb, offset, 12,
				"IPv4 prefix: %s mask %s",
				ip_to_str((guint8*)&src),
				ip_to_str((guint8*)&mask));
			} else {
			  ti = proto_tree_add_text ( tree, tvb, offset, 12,
				"IPv4 prefix: %s/%d",
				ip_to_str((guint8*)&src),
				prefix_len );
			};

			ntree = proto_item_add_subtree(ti,
				ett_isis_lsp_clv_ip_reachability);

			proto_tree_add_text (ntree, tvb, offset, 1,
				"Default Metric: %d, %s, Distribution: %s",
				ISIS_LSP_CLV_METRIC_VALUE(tvb_get_guint8(tvb, offset)),
				ISIS_LSP_CLV_METRIC_IE(tvb_get_guint8(tvb, offset)) ? "External" : "Internal",
				ISIS_LSP_CLV_METRIC_UPDOWN(tvb_get_guint8(tvb, offset)) ? "down" : "up");


			if (ISIS_LSP_CLV_METRIC_SUPPORTED(tvb_get_guint8(tvb, offset+1))) {
			  proto_tree_add_text (ntree, tvb, offset+1, 1, "Delay Metric:   Not supported");
					       } else {
                          proto_tree_add_text (ntree, tvb, offset+1, 1, "Delay Metric:   %d, %s",
					       ISIS_LSP_CLV_METRIC_VALUE(tvb_get_guint8(tvb, offset+1)),
					       ISIS_LSP_CLV_METRIC_IE(tvb_get_guint8(tvb, offset+1)) ? "External" : "Internal");
					       }

                        if (ISIS_LSP_CLV_METRIC_SUPPORTED(tvb_get_guint8(tvb, offset+2))) {
                          proto_tree_add_text (ntree, tvb, offset+2, 1, "Expense Metric: Not supported");
			} else {
                          proto_tree_add_text (ntree, tvb, offset+2, 1, "Exense Metric:  %d, %s",
                                               ISIS_LSP_CLV_METRIC_VALUE(tvb_get_guint8(tvb, offset+2)),
					       ISIS_LSP_CLV_METRIC_IE(tvb_get_guint8(tvb, offset+2)) ? "External" : "Internal");
			}

                        if (ISIS_LSP_CLV_METRIC_SUPPORTED(tvb_get_guint8(tvb, offset+3))) {
                          proto_tree_add_text (ntree, tvb, offset+3, 1, "Error Metric:   Not supported");
			} else {
                          proto_tree_add_text (ntree, tvb, offset+3, 1, "Error Metric:   %d, %s",
                                               ISIS_LSP_CLV_METRIC_VALUE(tvb_get_guint8(tvb, offset+3)),
					       ISIS_LSP_CLV_METRIC_IE(tvb_get_guint8(tvb, offset+3)) ? "External" : "Internal");
			}
		}
		offset += 12;
		length -= 12;
	}
}

/*
 * Name: dissect_ipreach_subclv ()
 *
 * Description: parses IP reach subTLVs
 *              Called by various IP Reachability dissectors.
 *
 * Input:
 *   tvbuff_t * : tvbuffer for packet data
 *   proto_tree * : protocol display tree to fill out.
 *   int : offset into packet data where we are (beginning of the sub_clv value).
 *
 * Output:
 *   void
 */
static void
dissect_ipreach_subclv(tvbuff_t *tvb, proto_tree *tree, int offset, int clv_code, int clv_len)
{

        switch (clv_code) {
        case 1:
                while (clv_len >= 4) {
                        proto_tree_add_text(tree, tvb, offset, 4,
                                    "32-Bit Administrative tag: 0x%08x (=%u)",
                                    tvb_get_ntohl(tvb, offset),
                                    tvb_get_ntohl(tvb, offset));                
                        offset+=4;
                        clv_len-=4;
                }
                break;
        case 2:
                while (clv_len >= 8) {
                        proto_tree_add_text(tree, tvb, offset, 8,
                                    "64-Bit Administrative tag: 0x%08x%08x",
                                    tvb_get_ntohl(tvb, offset),
                                    tvb_get_ntohl(tvb, offset+4));
                        offset+=8;
                        clv_len-=8;
                }
                break;

        default :
                proto_tree_add_text (tree, tvb, offset, clv_len+2,
                                     "Unknown sub-TLV: code %u, length %u",
                                     clv_code, clv_len );
                break;
        }
}


/*
 * Name: dissect_lsp_ext_ip_reachability_clv()
 *
 * Description: Decode an Extended IP Reachability CLV - code 135.
 *
 *   The extended IP reachability TLV is an extended version
 *   of the IP reachability TLVs (codes 128 and 130). It encodes
 *   the metric as a 32-bit unsigned interger and allows to add
 *   sub-CLV(s).
 *
 *   CALLED BY TLV 235 DISSECTOR
 *
 *
 * Input:
 *   tvbuff_t * : tvbuffer for packet data
 *   proto_tree * : proto tree to build on (may be null)
 *   int : current offset into packet data
 *   int : length of IDs in packet.
 *   int : length of this clv
 *
 * Output:
 *   void, will modify proto_tree if not null.
 */
static void
dissect_lsp_ext_ip_reachability_clv(tvbuff_t *tvb, proto_tree *tree,
	int offset, int id_length _U_, int length)
{
	proto_item *pi = NULL;
	proto_tree *subtree = NULL;
	proto_tree *subtree2 = NULL;
	guint8     ctrl_info;
	guint8     bit_length, byte_length;
	guint8     prefix [4];
	guint32    metric;
	guint8     len,i;
	guint8     subclvs_len;
	guint8     clv_code, clv_len;

	if (!tree) return;

	while (length > 0) {
		memset (prefix, 0, 4);
		ctrl_info = tvb_get_guint8(tvb, offset+4);
		bit_length = ctrl_info & 0x3f;
		byte_length = (bit_length + 7) / 8;
		if (byte_length > sizeof(prefix)) {
			 isis_dissect_unknown(tvb, tree, offset,
			 	"IPv4 prefix has an invalid length: %d bytes", byte_length );
      			return;
    		}
 		tvb_memcpy (tvb, prefix, offset+5, byte_length);
		metric = tvb_get_ntohl(tvb, offset);
		subclvs_len = 0;
		if ((ctrl_info & 0x40) != 0)
                        subclvs_len = 1+tvb_get_guint8(tvb, offset+5+byte_length);

		pi = proto_tree_add_text (tree, tvb, offset, 5+byte_length+subclvs_len,
                                          "IPv4 prefix: %s/%d, Metric: %u, Distribution: %s, %ssub-TLVs present",
                                          ip_to_str (prefix),
                                          bit_length,
                                          metric,
                                          ((ctrl_info & 0x80) == 0) ? "up" : "down",
                                          ((ctrl_info & 0x40) == 0) ? "no " : "" );

                /* open up a new tree per prefix */
		subtree = proto_item_add_subtree (pi, ett_isis_lsp_part_of_clv_ext_ip_reachability);

		proto_tree_add_text (subtree, tvb, offset+5, byte_length, "IPv4 prefix: %s/%u",
                                     ip_to_str (prefix),
                                     bit_length);

		proto_tree_add_text (subtree, tvb, offset, 4, "Metric: %u", metric);

		proto_tree_add_text (subtree, tvb, offset+4, 1, "Distribution: %s",
                                     ((ctrl_info & 0x80) == 0) ? "up" : "down");

		len = 5 + byte_length;
		if ((ctrl_info & 0x40) != 0) {
                        subclvs_len = tvb_get_guint8(tvb, offset+len);
                        pi = proto_tree_add_text (subtree, tvb, offset+len, 1, "sub-TLVs present, total length: %u bytes",
                                             subclvs_len);
                        proto_item_set_len (pi, subclvs_len+1);
                        /* open up a new tree for the subTLVs */
                        subtree2 = proto_item_add_subtree (pi, ett_isis_lsp_clv_ip_reach_subclv);

                        i =0;
                        while (i < subclvs_len) {
				clv_code = tvb_get_guint8(tvb, offset+len+1); /* skip the total subtlv len indicator */
				clv_len  = tvb_get_guint8(tvb, offset+len+2);
                                
                                /*
                                 * we pass on now the raw data to the ipreach_subtlv dissector
                                 * therefore we need to skip 3 bytes
                                 * (total subtlv len, subtlv type, subtlv len)
                                 */
                                dissect_ipreach_subclv(tvb, subtree2, offset+len+3, clv_code, clv_len);
                                i += clv_len + 2;
                        }
                        len += 1 + subclvs_len;
                } else {
                        proto_tree_add_text (subtree, tvb, offset+4, 1, "no sub-TLVs present");
                        proto_item_set_len (pi, len);
                }

		offset += len;
		length -= len;
	}
}

/*
 * Name: dissect_lsp_ipv6_reachability_clv()
 *
 * Description: Decode an IPv6 reachability CLV - code 236.
 *
 *   CALLED BY TLV 237 DISSECTOR
 *
 * Input:
 *   tvbuff_t * : tvbuffer for packet data
 *   proto_tree * : proto tree to build on (may be null)
 *   int : current offset into packet data
 *   int : length of IDs in packet.
 *   int : length of this clv
 *
 * Output:
 *   void, will modify proto_tree if not null.
 */
static void
dissect_lsp_ipv6_reachability_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
	int id_length _U_, int length)
{
	proto_item        *pi;
	proto_tree        *subtree = NULL;
	proto_tree        *subtree2 = NULL;
	guint8            ctrl_info;
	guint8            bit_length, byte_length;
	struct e_in6_addr prefix;
	guint32           metric;
	guint8            len,i;
	guint8            subclvs_len;
	guint8            clv_code, clv_len;

	if (!tree) return;

	while (length > 0) {
  	memset (prefix.s6_addr, 0, 16);
		ctrl_info = tvb_get_guint8(tvb, offset+4);
		bit_length = tvb_get_guint8(tvb, offset+5);
		byte_length = (bit_length + 7) / 8;
    		if (byte_length > sizeof(prefix)) {
			isis_dissect_unknown(tvb, tree, offset,
				"IPv6 prefix has an invalid length: %d bytes", byte_length );
      			return;
    		}
 		tvb_memcpy (tvb, prefix.s6_addr, offset+6, byte_length);
		metric = tvb_get_ntohl(tvb, offset);
		subclvs_len = 0;
		if ((ctrl_info & 0x20) != 0)
                        subclvs_len = 1+tvb_get_guint8(tvb, offset+6+byte_length);

		pi = proto_tree_add_text (tree, tvb, offset, 6+byte_length+subclvs_len,
                                          "IPv6 prefix: %s/%u, Metric: %u, Distribution: %s, %s, %ssub-TLVs present",
                                          ip6_to_str (&prefix),
                                          bit_length,
                                          metric,
                                          ((ctrl_info & 0x80) == 0) ? "up" : "down",
                                          ((ctrl_info & 0x40) == 0) ? "internal" : "external",
                                          ((ctrl_info & 0x20) == 0) ? "no " : "" );

		subtree = proto_item_add_subtree (pi, ett_isis_lsp_part_of_clv_ipv6_reachability);

		proto_tree_add_text (subtree, tvb, offset+6, byte_length, "IPv6 prefix: %s/%u",
                                     ip6_to_str (&prefix),
                                     bit_length);

		proto_tree_add_text (subtree, tvb, offset, 4,
			"Metric: %u", metric);

		proto_tree_add_text (subtree, tvb, offset+4, 1,
			"Distribution: %s, %s",
			((ctrl_info & 0x80) == 0) ? "up" : "down",
			((ctrl_info & 0x40) == 0) ? "internal" : "external" );

		if ((ctrl_info & 0x1f) != 0) {
			proto_tree_add_text (subtree, tvb, offset+4, 1,
					     "Reserved bits: 0x%x",
					     (ctrl_info & 0x1f) );
                }

		len = 6 + byte_length;
		if ((ctrl_info & 0x20) != 0) {
                        subclvs_len = tvb_get_guint8(tvb, offset+len);
                        pi = proto_tree_add_text (subtree, tvb, offset+len, 1, "sub-TLVs present, total length: %u bytes",
                                             subclvs_len);
                        proto_item_set_len (pi, subclvs_len+1);
                        /* open up a new tree for the subTLVs */
                        subtree2 = proto_item_add_subtree (pi, ett_isis_lsp_clv_ip_reach_subclv);

                        i =0;
                        while (i < subclvs_len) {
				clv_code = tvb_get_guint8(tvb, offset+len+1); /* skip the total subtlv len indicator */
				clv_len  = tvb_get_guint8(tvb, offset+len+2);
                                dissect_ipreach_subclv(tvb, subtree2, offset+len+3, clv_code, clv_len);
                                i += clv_len + 2;
                        }
                        len += 1 + subclvs_len;
                } else {
                        proto_tree_add_text (subtree, tvb, offset+4, 1, "no sub-TLVs present");
                        proto_item_set_len (pi, len);
                }
		offset += len;
		length -= len;
	}
}

/*
 * Name: dissect_lsp_nlpid_clv()
 *
 * Description:
 *	Decode for a lsp packets NLPID clv.  Calls into the
 *	clv common one.
 *
 * Input:
 *	tvbuff_t * : tvbuffer for packet data
 *	proto_tree * : proto tree to build on (may be null)
 *	int : current offset into packet data
 *	int : length of IDs in packet.
 *	int : length of this clv
 *
 * Output:
 *	void, will modify proto_tree if not null.
 */
static void
dissect_lsp_nlpid_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
	int id_length _U_, int length)
{
	isis_dissect_nlpid_clv(tvb, tree, offset, length);
}

/*
 * Name: dissect_lsp_mt_clv()
 *
 * Description: - code 229
 *	Decode for a lsp packets Multi Topology clv.  Calls into the
 *	clv common one.
 *
 * Input:
 *      tvbuff_t * : tvbuffer for packet data
 *      proto_tree * : proto tree to build on (may be null)
 *	int : current offset into packet data
 *	guint : length of this clv
 *	int : length of IDs in packet.
 *
 * Output:
 *	void, will modify proto_tree if not null.
 */
static void
dissect_lsp_mt_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
	int id_length _U_, int length)
{
	isis_dissect_mt_clv(tvb, tree, offset, length, hf_isis_lsp_clv_mt );
}

/*
 * Name: dissect_lsp_hostname_clv()
 *
 * Description:
 *      Decode for a lsp packets hostname clv.  Calls into the
 *      clv common one.
 *
 * Input:
 *      tvbuff_t * : tvbuffer for packet data
 *      proto_tree * : proto tree to build on (may be null)
 *      int : current offset into packet data
 *      int : length of IDs in packet.
 *      int : length of this clv
 *
 * Output:
 *      void, will modify proto_tree if not null.
 */
static void
dissect_lsp_hostname_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
	int id_length _U_, int length)
{
        isis_dissect_hostname_clv(tvb, tree, offset, length);
}


/*
 * Name: dissect_lsp_te_router_id_clv()
 *
 * Description:
 *      Decode for a lsp packets Traffic Engineering ID clv.  Calls into the
 *      clv common one.
 *
 * Input:
 *      tvbuff_t * : tvbuffer for packet data
 *      proto_tree * : proto tree to build on (may be null)
 *      int : current offset into packet data
 *      int : length of IDs in packet.
 *      int : length of this clv
 *
 * Output:
 *      void, will modify proto_tree if not null.
 */
static void
dissect_lsp_te_router_id_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
	int id_length _U_, int length)
{
        isis_dissect_te_router_id_clv(tvb, tree, offset, length,
                hf_isis_lsp_clv_te_router_id );
}


/*
 * Name: dissect_lsp_ip_int_addr_clv()
 *
 * Description:
 *	Decode for a lsp packets ip interface addr clv.  Calls into the
 *	clv common one.
 *
 * Input:
 *	tvbuff_t * : tvbuffer for packet data
 *	proto_tree * : proto tree to build on (may be null)
 *	int : current offset into packet data
 *	int : length of IDs in packet.
 *	int : length of this clv
 *
 * Output:
 *	void, will modify proto_tree if not null.
 */
static void
dissect_lsp_ip_int_addr_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
	int id_length _U_, int length)
{
	isis_dissect_ip_int_clv(tvb, tree, offset, length,
		hf_isis_lsp_clv_ipv4_int_addr );
}

/*
 * Name: dissect_lsp_ipv6_int_addr_clv()
 *
 * Description: Decode an IPv6 interface addr CLV - code 232.
 *
 *   Calls into the clv common one.
 *
 * Input:
 *   tvbuff_t * : tvbuffer for packet data
 *   proto_tree * : proto tree to build on (may be null)
 *   int : current offset into packet data
 *   int : length of IDs in packet.
 *   int : length of this clv
 *
 * Output:
 *   void, will modify proto_tree if not null.
 */
static void
dissect_lsp_ipv6_int_addr_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
	int id_length _U_, int length)
{
	isis_dissect_ipv6_int_clv(tvb, tree, offset, length,
		hf_isis_lsp_clv_ipv6_int_addr );
}

/*
 * Name: dissect_lsp_authentication_clv()
 *
 * Description:
 *	Decode for a lsp packets authenticaion clv.  Calls into the
 *	clv common one.
 *
 * Input:
 *	tvbuff_t * : tvbuffer for packet data
 *	proto_tree * : proto tree to build on (may be null)
 *	int : current offset into packet data
 *	int : length of IDs in packet.
 *	int : length of this clv
 *
 * Output:
 *	void, will modify proto_tree if not null.
 */
static void
dissect_lsp_authentication_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
	int id_length _U_, int length)
{
	isis_dissect_authentication_clv(tvb, tree, offset, length);
}

/*
 * Name: dissect_lsp_ip_authentication_clv()
 *
 * Description:
 *	Decode for a lsp packets authenticaion clv.  Calls into the
 *	clv common one.
 *
 * Input:
 *	tvbuff_t * : tvbuffer for packet data
 *	proto_tree * : proto tree to build on (may be null)
 *	int : current offset into packet data
 *	int : length of IDs in packet.
 *	int : length of this clv
 *
 * Output:
 *	void, will modify proto_tree if not null.
 */
static void
dissect_lsp_ip_authentication_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
	int id_length _U_, int length)
{
	isis_dissect_ip_authentication_clv(tvb, tree, offset, length);
}

/*
 * Name: dissect_lsp_area_address_clv()
 *
 * Description:
 *	Decode for a lsp packet's area address clv.  Call into clv common
 *	one.
 *
 * Input:
 *	tvbuff_t * : tvbuffer for packet data
 *	proto_tree * : protocol display tree to fill out.  May be NULL
 *	int : offset into packet data where we are.
 *	int : length of IDs in packet.
 *	int : length of clv we are decoding
 *
 * Output:
 *      void, but we will add to proto tree if !NULL.
 */
static void
dissect_lsp_area_address_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
	int id_length _U_, int length)
{
	isis_dissect_area_address_clv(tvb, tree, offset, length);
}

/*
 * Name: dissect_lsp_eis_neighbors_clv_inner()
 *
 * Description:
 *	Real work horse for showing neighbors.  This means we decode the
 *	first octet as either virtual/!virtual (if show_virtual param is
 *	set), or as a must == 0 reserved value.
 *
 *	Once past that, we decode n neighbor elements.  Each neighbor
 *	is comprised of a metric block (is dissect_metric) and the
 *	addresses.
 *
 * Input:
 *	tvbuff_t * : tvbuffer for packet data
 *	proto_tree * : protocol display tree to fill out.  May be NULL
 *	int : offset into packet data where we are.
 *	int : length of IDs in packet.
 *	int : length of clv we are decoding
 *	int : set to decode first octet as virtual vs reserved == 0
 *	int : set to indicate EIS instead of IS (6 octet per addr instead of 7)
 *
 * Output:
 *      void, but we will add to proto tree if !NULL.
 */
static void
dissect_lsp_eis_neighbors_clv_inner(tvbuff_t *tvb, proto_tree *tree,
	int offset, int length, int id_length, int show_virtual, int is_eis)
{
	proto_item 	*ti;
	proto_tree	*ntree = NULL;
	int		tlen;

	if (!is_eis) {
		id_length++;	/* IDs are one octet longer in IS neighbours */
		if ( tree ) {
			if ( show_virtual ) {
				/* virtual path flag */
				proto_tree_add_text ( tree, tvb, offset, 1,
				   tvb_get_guint8(tvb, offset) ? "IsVirtual" : "IsNotVirtual" );
			} else {
				proto_tree_add_text ( tree, tvb, offset, 1,
					"Reserved value 0x%02x, must == 0",
					tvb_get_guint8(tvb, offset)  );
			}
		}
		offset++;
		length--;
	}
	tlen = 4 + id_length;

	while ( length > 0 ) {
		if (length<tlen) {
			isis_dissect_unknown(tvb, tree, offset,
				"short E/IS reachability (%d vs %d)", length,
				tlen );
			return;
		}
		/*
		 * Gotta build a sub-tree for all our pieces
		 */
		if ( tree ) {
			if ( is_eis ) {
				ti = proto_tree_add_text(tree, tvb, offset, tlen,
					"ES Neighbor: %s",
				print_system_id( tvb_get_ptr(tvb, offset+4, id_length), id_length ) );
			} else {
				ti = proto_tree_add_text(tree, tvb, offset, tlen,
					"IS Neighbor:  %s",
				print_system_id(tvb_get_ptr(tvb, offset+4, id_length), id_length ) );
			}
			ntree = proto_item_add_subtree(ti,
				ett_isis_lsp_clv_is_neighbors);



                        proto_tree_add_text (ntree, tvb, offset, 1,
					     "Default Metric: %d, %s",
					     ISIS_LSP_CLV_METRIC_VALUE(tvb_get_guint8(tvb, offset)),
					     ISIS_LSP_CLV_METRIC_IE(tvb_get_guint8(tvb, offset)) ? "External" : "Internal");

			if (ISIS_LSP_CLV_METRIC_SUPPORTED(tvb_get_guint8(tvb, offset+1))) {
                          proto_tree_add_text (ntree, tvb, offset+1, 1, "Delay Metric:   Not supported");
			} else {
                          proto_tree_add_text (ntree, tvb, offset+1, 1, "Delay Metric:   %d, %s",
                                             ISIS_LSP_CLV_METRIC_VALUE(tvb_get_guint8(tvb, offset+1)),
					     ISIS_LSP_CLV_METRIC_IE(tvb_get_guint8(tvb, offset+1)) ? "External" : "Internal");
			}


                        if (ISIS_LSP_CLV_METRIC_SUPPORTED(tvb_get_guint8(tvb, offset+2))) {
                          proto_tree_add_text (ntree, tvb, offset+2, 1, "Expense Metric: Not supported");
                        } else {
                          proto_tree_add_text (ntree, tvb, offset+2, 1, "Expense Metric: %d, %s",
					       ISIS_LSP_CLV_METRIC_VALUE(tvb_get_guint8(tvb, offset+2)),
					       ISIS_LSP_CLV_METRIC_IE(tvb_get_guint8(tvb, offset+2)) ? "External" : "Internal");
                        }

                        if (ISIS_LSP_CLV_METRIC_SUPPORTED(tvb_get_guint8(tvb, offset+3))) {
                          proto_tree_add_text (ntree, tvb, offset+3, 1, "Error Metric:   Not supported");
                        } else {
                          proto_tree_add_text (ntree, tvb, offset+3, 1, "Error Metric:   %d, %s",
					       ISIS_LSP_CLV_METRIC_VALUE(tvb_get_guint8(tvb, offset+3)),
					       ISIS_LSP_CLV_METRIC_IE(tvb_get_guint8(tvb, offset+3)) ? "External" : "Internal");
                        }

		}
		offset += tlen;
		length -= tlen;
	}
}

/*
 * Name: dissect_lsp_l1_is_neighbors_clv()
 *
 * Description:
 *	Dispatch a l1 intermediate system neighbor by calling
 *	the inner function with show virtual set to TRUE and is es set to FALSE.
 *
 * Input:
 *	tvbuff_t * : tvbuffer for packet data
 *	proto_tree * : protocol display tree to fill out.  May be NULL
 *	int : offset into packet data where we are.
 *	int : length of IDs in packet.
 *	int : length of clv we are decoding
 *
 * Output:
 *      void, but we will add to proto tree if !NULL.
 */
static void
dissect_lsp_l1_is_neighbors_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
	int id_length, int length)
{
	dissect_lsp_eis_neighbors_clv_inner(tvb, tree, offset,
		length, id_length, TRUE, FALSE);
}

/*
 * Name: dissect_lsp_l1_es_neighbors_clv()
 *
 * Description:
 *	Dispatch a l1 end or intermediate system neighbor by calling
 *	the inner function with show virtual set to TRUE and es set to TRUE.
 *
 * Input:
 *	tvbuff_t * : tvbuffer for packet data
 *	proto_tree * : protocol display tree to fill out.  May be NULL
 *	int : offset into packet data where we are.
 *	int : length of IDs in packet.
 *	int : length of clv we are decoding
 *
 * Output:
 *      void, but we will add to proto tree if !NULL.
 */
static void
dissect_lsp_l1_es_neighbors_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
	int id_length, int length)
{
	dissect_lsp_eis_neighbors_clv_inner(tvb, tree, offset,
		length, id_length, TRUE, TRUE);
}

/*
 * Name: dissect_lsp_l2_is_neighbors_clv()
 *
 * Description:
 *	Dispatch a l2 intermediate system neighbor by calling
 *	the inner function with show virtual set to FALSE, and is es set
 *	to FALSE
 *
 * Input:
 *	tvbuff_t * : tvbuffer for packet data
 *	proto_tree * : protocol display tree to fill out.  May be NULL
 *	int : offset into packet data where we are.
 *	int : length of IDs in packet.
 *	int : length of clv we are decoding
 *
 * Output:
 *      void, but we will add to proto tree if !NULL.
 */
static void
dissect_lsp_l2_is_neighbors_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
	int id_length, int length)
{
	dissect_lsp_eis_neighbors_clv_inner(tvb, tree, offset,
		length, id_length, FALSE, FALSE);
}


/*
 * Name: dissect_subclv_admin_group ()
 *
 * Description: Called by function dissect_lsp_ext_is_reachability_clv().
 *
 *   This function is called by dissect_lsp_ext_is_reachability_clv()
 *   for dissect the administrive group sub-CLV (code 3).
 *
 * Input:
 *   tvbuff_t * : tvbuffer for packet data
 *   proto_tree * : protocol display tree to fill out.
 *   int : offset into packet data where we are (beginning of the sub_clv value).
 *
 * Output:
 *   void
 */
static void
dissect_subclv_admin_group (tvbuff_t *tvb, proto_tree *tree, int offset) {
	proto_item *ti;
	proto_tree *ntree;
	guint32    clv_value;
	guint32    mask;
	int        i;

	ti = proto_tree_add_text(tree, tvb, offset-2, 6, "Administrative group(s):");
	ntree = proto_item_add_subtree (ti, ett_isis_lsp_subclv_admin_group);

	clv_value = tvb_get_ntohl(tvb, offset);
	mask = 1;
	for (i = 0 ; i < 32 ; i++) {
		if ( (clv_value & mask) != 0 ) {
			proto_tree_add_text (ntree, tvb, offset, 4, "group %d", i);
		}
		mask <<= 1;
	}
}

/*
 * Name: dissect_subclv_max_bw ()
 *
 * Description: Called by function dissect_lsp_ext_is_reachability_clv().
 *
 *   This function is called by dissect_lsp_ext_is_reachability_clv()
 *   for dissect the maximum link bandwidth sub-CLV (code 9).
 *
 * Input:
 *   tvbuff_t * : tvbuffer for packet data
 *   proto_tree * : protocol display tree to fill out.
 *   int : offset into packet data where we are (beginning of the sub_clv value).
 *
 * Output:
 *   void
 */
static void
dissect_subclv_max_bw(tvbuff_t *tvb, proto_tree *tree, int offset)
{
	gfloat  bw;

	bw = tvb_get_ntohieee_float(tvb, offset);
	proto_tree_add_text (tree, tvb, offset-2, 6,
		"Maximum link bandwidth : %.2f Mbps", bw*8/1000000 );
}

/*
 * Name: dissect_subclv_rsv_bw ()
 *
 * Description: Called by function dissect_lsp_ext_is_reachability_clv().
 *
 *   This function is called by dissect_lsp_ext_is_reachability_clv()
 *   for dissect the reservable link bandwidth sub-CLV (code 10).
 *
 * Input:
 *   tvbuff_t * : tvbuffer for packet data
 *   proto_tree * : protocol display tree to fill out.
 *   int : offset into packet data where we are (beginning of the sub_clv value).
 *
 * Output:
 *   void
 */
static void
dissect_subclv_rsv_bw(tvbuff_t *tvb, proto_tree *tree, int offset)
{
	gfloat  bw;

	bw = tvb_get_ntohieee_float(tvb, offset);
	proto_tree_add_text (tree, tvb, offset-2, 6,
		"Reservable link bandwidth: %.2f Mbps", bw*8/1000000 );
}

/*
 * Name: dissect_subclv_unrsv_bw ()
 *
 * Description: Called by function dissect_lsp_ext_is_reachability_clv().
 *
 *   This function is called by dissect_lsp_ext_is_reachability_clv()
 *   for dissect the unreserved bandwidth sub-CLV (code 11).
 *
 * Input:
 *   tvbuff_t * : tvbuffer for packet data
 *   proto_tree * : protocol display tree to fill out.
 *   int : offset into packet data where we are (beginning of the sub_clv value).
 *
 * Output:
 *   void
 */
static void
dissect_subclv_unrsv_bw(tvbuff_t *tvb, proto_tree *tree, int offset)
{
	proto_item *ti;
	proto_tree *ntree;
	gfloat     bw;
	int        i;

	ti = proto_tree_add_text (tree, tvb, offset-2, 34, "Unreserved bandwidth:");
	ntree = proto_item_add_subtree (ti, ett_isis_lsp_subclv_unrsv_bw);

	for (i = 0 ; i < 8 ; i++) {
		bw = tvb_get_ntohieee_float(tvb, offset+4*i);
		proto_tree_add_text (ntree, tvb, offset+4*i, 4,
			"priority level %d: %.2f Mbps", i, bw*8/1000000 );
	}
}

/*
 * Name: dissect_lsp_ext_is_reachability_clv()
 *
 * Description: Decode a Extended IS Reachability CLV - code 22
 *
 *   The extended IS reachability TLV is an extended version
 *   of the IS reachability TLV (code 2). It encodes the metric
 *   as a 24-bit unsigned interger and allows to add sub-CLV(s).
 *
 *   CALLED BY TLV 222 DISSECTOR
 *
 * Input:
 *   tvbuff_t * : tvbuffer for packet data
 *   proto_tree * : protocol display tree to fill out.  May be NULL
 *   int : offset into packet data where we are.
 *   int : length of IDs in packet.
 *   int : length of clv we are decoding
 *
 * Output:
 *   void, but we will add to proto tree if !NULL.
 */
static void
dissect_lsp_ext_is_reachability_clv(tvbuff_t *tvb, proto_tree *tree,
	int offset, int id_length _U_, int length)
{
	proto_item *ti;
	proto_tree *ntree = NULL;
	guint8     subclvs_len;
	guint8     len, i;
	guint8     clv_code, clv_len;

	if (!tree) return;

	while (length > 0) {
		ti = proto_tree_add_text (tree, tvb, offset, -1,
			"IS neighbor: %s",
			print_system_id (tvb_get_ptr(tvb, offset, 7), 7) );
		ntree = proto_item_add_subtree (ti,
			ett_isis_lsp_part_of_clv_ext_is_reachability );

		proto_tree_add_text (ntree, tvb, offset+7, 3,
			"Metric: %d", tvb_get_ntoh24(tvb, offset+7) );

		subclvs_len = tvb_get_guint8(tvb, offset+10);
		if (subclvs_len == 0) {
			proto_tree_add_text (ntree, tvb, offset+10, 1, "no sub-TLVs present");
		}
		else {
			i = 0;
			while (i < subclvs_len) {
				clv_code = tvb_get_guint8(tvb, offset+11+i);
				clv_len  = tvb_get_guint8(tvb, offset+12+i);
				switch (clv_code) {
				case 3 :
					dissect_subclv_admin_group(tvb, ntree, offset+13+i);
					break;
				case 6 :
					proto_tree_add_text (ntree, tvb, offset+11+i, 6,
						"IPv4 interface address: %s", ip_to_str (tvb_get_ptr(tvb, offset+13+i, 4)) );
					break;
				case 8 :
					proto_tree_add_text (ntree, tvb, offset+11+i, 6,
						"IPv4 neighbor address: %s", ip_to_str (tvb_get_ptr(tvb, offset+13+i, 4)) );
					break;
				case 9 :
					dissect_subclv_max_bw (tvb, ntree, offset+13+i);
					break;
				case 10:
					dissect_subclv_rsv_bw (tvb, ntree, offset+13+i);
					break;
				case 11:
					dissect_subclv_unrsv_bw (tvb, ntree, offset+13+i);
					break;
				case 18:
					proto_tree_add_text (ntree, tvb, offset+11+i, 5,
						"Traffic engineering default metric: %d",
						tvb_get_ntoh24(tvb, offset+13+i) );
					break;
				case 250:
				case 251:
				case 252:
				case 253:
				case 254:
					proto_tree_add_text (ntree, tvb, offset+11+i, clv_len+2,
						"Unknown Cisco specific extensions: code %d, length %d",
						clv_code, clv_len );
					break;
				default :
					proto_tree_add_text (ntree, tvb, offset+11+i, clv_len+2,
						"Unknown sub-CLV: code %d, length %d", clv_code, clv_len );
					break;
				}
				i += clv_len + 2;
			}
		}

		len = 11 + subclvs_len;
		proto_item_set_len (ti, len);
		offset += len;
		length -= len;
	}
}

/*
 * Name: dissect_lsp_mt_reachable_IPv4_prefx_clv()
 *
 * Description: Decode Multi-Topology IPv4 Prefixes - code 235
 *
 *
 * Input:
 *   tvbuff_t * : tvbuffer for packet data
 *   proto_tree * : protocol display tree to fill out.  May be NULL
 *   int : offset into packet data where we are.
 *   int : length of IDs in packet.
 *   int : length of clv we are decoding
 *
 * Output:
 *   void, but we will add to proto tree if !NULL.
 */
static void
dissect_lsp_mt_reachable_IPv4_prefx_clv(tvbuff_t *tvb,
        proto_tree *tree, int offset, int id_length _U_, int length)
{
	if (!tree) return;
	if (length < 2) {
		isis_dissect_unknown(tvb, tree, offset,
				"short lsp multi-topology reachable IPv4 prefixes(%d vs %d)", length,
				2 );
		return;
	}
	dissect_lsp_mt_id(tvb, tree, offset);
	dissect_lsp_ext_ip_reachability_clv(tvb, tree, offset+2, 0, length-2);
}

/*
 * Name: dissect_lsp_mt_reachable_IPv6_prefx_clv()
 *
 * Description: Decode Multi-Topology IPv6 Prefixes - code 237
 *
 *
 * Input:
 *   tvbuff_t * : tvbuffer for packet data
 *   proto_tree * : protocol display tree to fill out.  May be NULL
 *   int : offset into packet data where we are.
 *   int : length of IDs in packet.
 *   int : length of clv we are decoding
 *
 * Output:
 *   void, but we will add to proto tree if !NULL.
 */
static void
dissect_lsp_mt_reachable_IPv6_prefx_clv(tvbuff_t *tvb,
        proto_tree *tree, int offset, int id_length _U_, int length)
{
	if (!tree) return;
	if (length < 2) {
		isis_dissect_unknown(tvb, tree, offset,
				"short lsp multi-topology reachable IPv6 prefixes(%d vs %d)", length,
				2 );
		return;
	}
	dissect_lsp_mt_id(tvb, tree, offset);
	dissect_lsp_ipv6_reachability_clv(tvb, tree, offset+2, 0, length-2);
}


/*
 * Name: dissect_lsp_mt_is_reachability_clv()
 *
 * Description: Decode Multi-Topology Intermediate Systems - code 222
 *
 *
 * Input:
 *   tvbuff_t * : tvbuffer for packet data
 *   proto_tree * : protocol display tree to fill out.  May be NULL
 *   int : offset into packet data where we are.
 *   int : unused
 *   int : length of clv we are decoding
 *
 * Output:
 *   void, but we will add to proto tree if !NULL.
 */

static void
dissect_lsp_mt_is_reachability_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
	int id_length _U_, int length)
{
	if (!tree) return;
	if (length < 2) {
		isis_dissect_unknown(tvb, tree, offset,
				"short lsp reachability(%d vs %d)", length,
				2 );
		return;
	}

	/*
	 * the MT ID value dissection is used in other LSPs so we push it
	 * in a function
	 */
	dissect_lsp_mt_id(tvb, tree, offset);
	/*
	 * fix here. No need to parse TLV 22 (with bugs) while it is
	 * already done correctly!!
	 */
	dissect_lsp_ext_is_reachability_clv(tvb, tree, offset+2, 0, length-2);
}

/*
 * Name: dissect_lsp_partition_dis_clv()
 *
 * Description:
 *	This CLV is used to indicate which system is the designated
 *	IS for partition repair.  This means just putting out the
 *	"id_length"-octet IS.
 *
 * Input:
 *	tvbuff_t * : tvbuffer for packet data
 *	proto_tree * : protocol display tree to fill out.  May be NULL
 *	int : offset into packet data where we are.
 *	int : length of IDs in packet.
 *	int : length of clv we are decoding
 *
 * Output:
 *      void, but we will add to proto tree if !NULL.
 */
static void
dissect_lsp_partition_dis_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
	int id_length, int length)
{
	if ( length < id_length ) {
		isis_dissect_unknown(tvb, tree, offset,
				"short lsp partition DIS(%d vs %d)", length,
				id_length );
		return;
	}
	/*
	 * Gotta build a sub-tree for all our pieces
	 */
	if ( tree ) {
		proto_tree_add_text ( tree, tvb, offset, id_length,
			"Partition designated L2 IS: %s",
			print_system_id( tvb_get_ptr(tvb, offset, id_length), id_length ) );
	}
	length -= id_length;
	offset += id_length;
	if ( length > 0 ){
		isis_dissect_unknown(tvb, tree, offset,
				"Long lsp partition DIS, %d left over", length );
		return;
	}
}

/*
 * Name: dissect_lsp_prefix_neighbors_clv()
 *
 * Description:
 *	The prefix CLV describes what other (OSI) networks we can reach
 *	and what their cost is.  It is built from a metric block
 *	(see dissect_metric) followed by n addresses.
 *
 * Input:
 *	tvbuff_t * : tvbuffer for packet data
 *	proto_tree * : protocol display tree to fill out.  May be NULL
 *	int : offset into packet data where we are.
 *	int : length of IDs in packet.
 *	int : length of clv we are decoding
 *
 * Output:
 *      void, but we will add to proto tree if !NULL.
 */
static void
dissect_lsp_prefix_neighbors_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
	int id_length _U_, int length)
{
	char *sbuf;
	int mylen;

	if ( length < 4 ) {
		isis_dissect_unknown(tvb, tree, offset,
			"Short lsp prefix neighbors (%d vs 4)", length );
		return;
	}
	if ( tree ) {
		dissect_metric (tvb, tree, offset,
			tvb_get_guint8(tvb, offset), "Default", TRUE );
		dissect_metric (tvb, tree, offset+1,
			tvb_get_guint8(tvb, offset+1), "Delay", FALSE );
		dissect_metric (tvb, tree, offset+2,
			tvb_get_guint8(tvb, offset+2), "Expense", FALSE );
		dissect_metric (tvb, tree, offset+3,
			tvb_get_guint8(tvb, offset+3), "Error", FALSE );
	}
	offset += 4;
	length -= 4;
	while ( length > 0 ) {
		mylen = tvb_get_guint8(tvb, offset);
		length--;
		if (length<=0) {
			isis_dissect_unknown(tvb, tree, offset,
				"Zero payload space after length in prefix neighbor" );
			return;
		}
		if ( mylen > length) {
			isis_dissect_unknown(tvb, tree, offset,
				"Interal length of prefix neighbor too long (%d vs %d)",
				mylen, length );
			return;
		}

		/*
		 * Lets turn the area address into "standard" 0000.0000.etc
		 * format string.
		 */
		sbuf =  print_area( tvb_get_ptr(tvb, offset+1, mylen), mylen );
		/* and spit it out */
		if ( tree ) {
			proto_tree_add_text ( tree, tvb, offset, mylen + 1,
				"Area address (%d): %s", mylen, sbuf );
		}
		offset += mylen + 1;
		length -= mylen;	/* length already adjusted for len fld*/
	}
}

/*
 * Name: isis_dissect_isis_lsp()
 *
 * Description:
 *	Print out the LSP part of the main header and then call the CLV
 *	de-mangler with the right list of valid CLVs.
 *
 * Input:
 *	tvbuff_t * : tvbuffer for packet data
 *	proto_tree * : protocol display tree to add to.  May be NULL.
 *	int offset : our offset into packet data.
 *	int : LSP type, a la packet-isis.h ISIS_TYPE_* values
 *	int : header length of packet.
 *	int : length of IDs in packet.
 *
 * Output:
 *      void, but we will add to proto tree if !NULL.
 */
void
isis_dissect_isis_lsp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset,
	int lsp_type, int header_length, int id_length)
{
	proto_item	*ti, *to, *ta;
	proto_tree	*lsp_tree = NULL, *info_tree, *att_tree;
	guint16		pdu_length, checksum, cacl_checksum=0;
	guint8		lsp_info, lsp_att;
	int		len, offset_checksum;

	if (tree) {
		ti = proto_tree_add_text(tree, tvb, offset, -1,
		    PROTO_STRING_LSP);
		lsp_tree = proto_item_add_subtree(ti, ett_isis_lsp);
	}

	pdu_length = tvb_get_ntohs(tvb, offset);
	if (tree) {
		proto_tree_add_uint(lsp_tree, hf_isis_lsp_pdu_length, tvb,
			offset, 2, pdu_length);
	}
	offset += 2;

	if (tree) {
		proto_tree_add_text(lsp_tree, tvb, offset, 2,
                                    "Remaining Lifetime: %us",
                                    tvb_get_ntohs(tvb, offset));
	}
	offset += 2;
	offset_checksum = offset;

	if (tree) {
		proto_tree_add_text(lsp_tree, tvb, offset, id_length + 2,
                                    "LSP-ID: %s",
                                    print_system_id( tvb_get_ptr(tvb, offset, id_length+2), id_length+2 ) );                
	}

	if (check_col(pinfo->cinfo, COL_INFO)) {
	    col_append_fstr(pinfo->cinfo, COL_INFO, ", LSP-ID: %s",
			print_system_id( tvb_get_ptr(tvb, offset, id_length+2), id_length+2 ) );
	}
	offset += id_length + 2;

	if (tree) {
		proto_tree_add_uint(lsp_tree, hf_isis_lsp_sequence_number, tvb,
			offset, 4,
			tvb_get_ntohl(tvb, offset));
	}
	if (check_col(pinfo->cinfo, COL_INFO)) {
		col_append_fstr(pinfo->cinfo, COL_INFO, ", Sequence: 0x%08x, Lifetime: %5us",
			tvb_get_ntohl(tvb, offset),
			tvb_get_ntohs(tvb, offset - (id_length+2+2)));
	}
	offset += 4;

	if (tree) {
    		checksum = tvb_get_ntohs(tvb, offset);    		
		switch (check_and_get_checksum(tvb, offset_checksum, pdu_length-12, checksum, offset, &cacl_checksum))
		{

        		case NO_CKSUM :
	      			proto_tree_add_uint_format(lsp_tree, hf_isis_lsp_checksum, tvb, offset, 2, checksum,
					"Checksum: 0x%04x (unused)", checksum);
       	 		break;
        		case DATA_MISSING :
          			isis_dissect_unknown(tvb, tree, offset,
		    			"packet length %d went beyond packet",
      			 		tvb_length_remaining(tvb, offset_checksum));
        		break;
        		case CKSUM_NOT_OK :
					proto_tree_add_uint_format(lsp_tree, hf_isis_lsp_checksum, tvb, offset, 2, checksum,
						"Checksum: 0x%04x (incorrect, should be 0x%04x)",
						checksum, cacl_checksum);
					proto_tree_add_boolean_hidden(lsp_tree, hf_isis_lsp_checksum_bad,
						tvb, offset, 2, TRUE);
        		break;
	        	case CKSUM_OK :
	        			proto_tree_add_uint_format(lsp_tree, hf_isis_lsp_checksum, tvb, offset, 2, checksum,
						"Checksum: 0x%04x (correct)", checksum);
					proto_tree_add_boolean_hidden(lsp_tree, hf_isis_lsp_checksum_bad,
						tvb, offset, 2, FALSE);
        		break;
        		default :
          			g_message("'check_and_get_checksum' returned an invalid value");
    		}
	}
	offset += 2;

	if (tree) {
		/*
		 * P | ATT | HIPPITY | IS TYPE description.
		 */
		lsp_info = tvb_get_guint8(tvb, offset);
		to = proto_tree_add_text(lsp_tree, tvb, offset, 1,
			"Type block(0x%02x): Partition Repair:%d, Attached bits:%d, Overload bit:%d, IS type:%d",
			lsp_info,
			ISIS_LSP_PARTITION(lsp_info),
			ISIS_LSP_ATT(lsp_info),
			ISIS_LSP_HIPPITY(lsp_info),
			ISIS_LSP_IS_TYPE(lsp_info)
			);

		info_tree = proto_item_add_subtree(to, ett_isis_lsp_info);
		proto_tree_add_boolean(info_tree, hf_isis_lsp_p, tvb, offset, 1, lsp_info);
		ta = proto_tree_add_uint(info_tree, hf_isis_lsp_att, tvb, offset, 1, lsp_info);
		att_tree = proto_item_add_subtree(ta, ett_isis_lsp_att);
		lsp_att = ISIS_LSP_ATT(lsp_info);
		proto_tree_add_text(att_tree, tvb, offset, 1,
			  "%d... = Error metric: %s", ISIS_LSP_ATT_ERROR(lsp_att), ISIS_LSP_ATT_ERROR(lsp_att) ? "Set" : "Unset");
		proto_tree_add_text(att_tree, tvb, offset, 1,
			  ".%d.. = Expense metric: %s", ISIS_LSP_ATT_EXPENSE(lsp_att), ISIS_LSP_ATT_EXPENSE(lsp_att) ? "Set" : "Unset");
		proto_tree_add_text(att_tree, tvb, offset, 1,
			  "..%d. = Delay metric: %s", ISIS_LSP_ATT_DELAY(lsp_att), ISIS_LSP_ATT_DELAY(lsp_att) ? "Set" : "Unset");
		proto_tree_add_text(att_tree, tvb, offset, 1,
			  "...%d = Default metric: %s", ISIS_LSP_ATT_DEFAULT(lsp_att), ISIS_LSP_ATT_DEFAULT(lsp_att) ? "Set" : "Unset");
		proto_tree_add_boolean(info_tree, hf_isis_lsp_hippity, tvb, offset, 1, lsp_info);
		proto_tree_add_uint(info_tree, hf_isis_lsp_is_type, tvb, offset, 1, lsp_info);
	}
	offset += 1;

	len = pdu_length - header_length;
	if (len < 0) {
		isis_dissect_unknown(tvb, tree, offset,
			"packet header length %d went beyond packet",
			 header_length );
		return;
	}
	/*
	 * Now, we need to decode our CLVs.  We need to pass in
	 * our list of valid ones!
	 */
	if (lsp_type == ISIS_TYPE_L1_LSP){
		isis_dissect_clvs(tvb, lsp_tree, offset,
			clv_l1_lsp_opts, len, id_length,
			ett_isis_lsp_clv_unknown );
	} else {
		isis_dissect_clvs(tvb, lsp_tree, offset,
			clv_l2_lsp_opts, len, id_length,
			ett_isis_lsp_clv_unknown );
	}
}
/*
 * Name: isis_register_lsp()
 *
 * Description:
 *	Register our protocol sub-sets with protocol manager.
 *
 * Input:
 *	int : protocol index for the ISIS protocol
 *
 * Output:
 *	void
 */
void
isis_register_lsp(int proto_isis) {
	static hf_register_info hf[] = {
		{ &hf_isis_lsp_pdu_length,
		{ "PDU length",		"isis.lsp.pdu_length", FT_UINT16,
		  BASE_DEC, NULL, 0x0, "", HFILL }},

		{ &hf_isis_lsp_remaining_life,
		{ "Remaining lifetime",	"isis.lsp.remaining_life", FT_UINT16,
		  BASE_DEC, NULL, 0x0, "", HFILL }},

		{ &hf_isis_lsp_sequence_number,
		{ "Sequence number",           "isis.lsp.sequence_number",
		  FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL }},

		{ &hf_isis_lsp_checksum,
		{ "Checksum",		"isis.lsp.checksum",FT_UINT16,
		  BASE_HEX, NULL, 0x0, "", HFILL }},
		  
		{ &hf_isis_lsp_checksum_bad,
		{ "Bad Checksum", "isis.lsp.checksum_bad", FT_BOOLEAN, BASE_NONE,
			NULL, 0, "Bad IS-IS LSP Checksum", HFILL }},

		{ &hf_isis_lsp_clv_ipv4_int_addr,
		{ "IPv4 interface address", "isis.lsp.clv_ipv4_int_addr", FT_IPv4,
		   BASE_NONE, NULL, 0x0, "", HFILL }},

		{ &hf_isis_lsp_clv_ipv6_int_addr,
		{ "IPv6 interface address", "isis.lsp.clv_ipv6_int_addr", FT_IPv6,
		   BASE_NONE, NULL, 0x0, "", HFILL }},

		{ &hf_isis_lsp_clv_te_router_id,
		{ "Traffic Engineering Router ID", "isis.lsp.clv_te_router_id", FT_IPv4,
		   BASE_NONE, NULL, 0x0, "", HFILL }},

		{ &hf_isis_lsp_clv_mt,
		{ "MT-ID                     ", "isis.lsp.clv_mt",
			FT_UINT16, BASE_HEX, NULL, 0x0, "", HFILL }},

		{ &hf_isis_lsp_p,
		{ "Partition Repair",	"isis.lsp.partition_repair", FT_BOOLEAN, 8,
			TFS(&supported_string), ISIS_LSP_PARTITION_MASK,
			"If set, this router supports the optional Partition Repair function", HFILL }},

		{ &hf_isis_lsp_att,
		{ "Attachment",	"isis.lsp.att", FT_UINT8, BASE_DEC,
			NULL, ISIS_LSP_ATT_MASK,
			"", HFILL }},

		{ &hf_isis_lsp_hippity,
		{ "Overload bit",	"isis.lsp.overload", FT_BOOLEAN, 8,
			TFS(&hippity_string), ISIS_LSP_HIPPITY_MASK,
			"If set, this router will not be used by any decision process to calculate routes", HFILL }},

		{ &hf_isis_lsp_is_type,
		{ "Type of Intermediate System",	"isis.lsp.is_type", FT_UINT8, BASE_DEC,
			VALS(isis_lsp_istype_vals), ISIS_LSP_IS_TYPE_MASK,
			"", HFILL }},
	};
	static gint *ett[] = {
		&ett_isis_lsp,
		&ett_isis_lsp_info,
		&ett_isis_lsp_att,
		&ett_isis_lsp_clv_area_addr,
		&ett_isis_lsp_clv_is_neighbors,
		&ett_isis_lsp_clv_ext_is_reachability, /* CLV 22 */
		&ett_isis_lsp_part_of_clv_ext_is_reachability,
		&ett_isis_lsp_subclv_admin_group,
		&ett_isis_lsp_subclv_unrsv_bw,
		&ett_isis_lsp_clv_unknown,
		&ett_isis_lsp_clv_partition_dis,
		&ett_isis_lsp_clv_prefix_neighbors,
		&ett_isis_lsp_clv_authentication,
		&ett_isis_lsp_clv_ip_authentication,
		&ett_isis_lsp_clv_nlpid,
                &ett_isis_lsp_clv_hostname,
		&ett_isis_lsp_clv_ipv4_int_addr,
		&ett_isis_lsp_clv_ipv6_int_addr, /* CLV 232 */
		&ett_isis_lsp_clv_te_router_id,
		&ett_isis_lsp_clv_ip_reachability,
                &ett_isis_lsp_clv_ip_reach_subclv,
		&ett_isis_lsp_clv_ext_ip_reachability, /* CLV 135 */
		&ett_isis_lsp_part_of_clv_ext_ip_reachability,
		&ett_isis_lsp_clv_ipv6_reachability, /* CLV 236 */
		&ett_isis_lsp_part_of_clv_ipv6_reachability,
		&ett_isis_lsp_clv_mt,
		&ett_isis_lsp_clv_mt_is,
		&ett_isis_lsp_part_of_clv_mt_is,
    &ett_isis_lsp_clv_mt_reachable_IPv4_prefx,
    &ett_isis_lsp_clv_mt_reachable_IPv6_prefx,
	};

	proto_register_field_array(proto_isis, hf, array_length(hf));
	proto_register_subtree_array(ett, array_length(ett));
}