summaryrefslogtreecommitdiffstats
path: root/test/test_ip6.py
blob: 8a2b332d1672080ed50099031e414a138a0398c7 (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
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
#!/usr/bin/env python3

import socket
from socket import inet_pton, inet_ntop
import unittest

from parameterized import parameterized
import scapy.compat
import scapy.layers.inet6 as inet6
from scapy.contrib.mpls import MPLS
from scapy.layers.inet6 import IPv6, ICMPv6ND_NS, ICMPv6ND_RS, \
    ICMPv6ND_RA, ICMPv6NDOptMTU, ICMPv6NDOptSrcLLAddr, ICMPv6NDOptPrefixInfo, \
    ICMPv6ND_NA, ICMPv6NDOptDstLLAddr, ICMPv6DestUnreach, icmp6types, \
    ICMPv6TimeExceeded, ICMPv6EchoRequest, ICMPv6EchoReply, \
    IPv6ExtHdrHopByHop, ICMPv6MLReport2, ICMPv6MLDMultAddrRec
from scapy.layers.l2 import Ether, Dot1Q
from scapy.packet import Raw
from scapy.utils6 import in6_getnsma, in6_getnsmac, in6_ptop, in6_islladdr, \
    in6_mactoifaceid
from six import moves

from framework import VppTestCase, VppTestRunner, tag_run_solo
from util import ppp, ip6_normalize, mk_ll_addr
from vpp_papi import VppEnum
from vpp_ip import DpoProto, VppIpPuntPolicer, VppIpPuntRedirect
from vpp_ip_route import VppIpRoute, VppRoutePath, find_route, VppIpMRoute, \
    VppMRoutePath, VppMplsIpBind, \
    VppMplsRoute, VppMplsTable, VppIpTable, FibPathType, FibPathProto, \
    VppIpInterfaceAddress, find_route_in_dump, find_mroute_in_dump, \
    VppIp6LinkLocalAddress
from vpp_neighbor import find_nbr, VppNeighbor
from vpp_pg_interface import is_ipv6_misc
from vpp_sub_interface import VppSubInterface, VppDot1QSubint
from vpp_policer import VppPolicer, PolicerAction
from ipaddress import IPv6Network, IPv6Address

AF_INET6 = socket.AF_INET6

try:
    text_type = unicode
except NameError:
    text_type = str

NUM_PKTS = 67


class TestIPv6ND(VppTestCase):
    def validate_ra(self, intf, rx, dst_ip=None):
        if not dst_ip:
            dst_ip = intf.remote_ip6

        # unicasted packets must come to the unicast mac
        self.assertEqual(rx[Ether].dst, intf.remote_mac)

        # and from the router's MAC
        self.assertEqual(rx[Ether].src, intf.local_mac)

        # the rx'd RA should be addressed to the sender's source
        self.assertTrue(rx.haslayer(ICMPv6ND_RA))
        self.assertEqual(in6_ptop(rx[IPv6].dst),
                         in6_ptop(dst_ip))

        # and come from the router's link local
        self.assertTrue(in6_islladdr(rx[IPv6].src))
        self.assertEqual(in6_ptop(rx[IPv6].src),
                         in6_ptop(mk_ll_addr(intf.local_mac)))

    def validate_na(self, intf, rx, dst_ip=None, tgt_ip=None):
        if not dst_ip:
            dst_ip = intf.remote_ip6
        if not tgt_ip:
            dst_ip = intf.local_ip6

        # unicasted packets must come to the unicast mac
        self.assertEqual(rx[Ether].dst, intf.remote_mac)

        # and from the router's MAC
        self.assertEqual(rx[Ether].src, intf.local_mac)

        # the rx'd NA should be addressed to the sender's source
        self.assertTrue(rx.haslayer(ICMPv6ND_NA))
        self.assertEqual(in6_ptop(rx[IPv6].dst),
                         in6_ptop(dst_ip))

        # and come from the target address
        self.assertEqual(
            in6_ptop(rx[IPv6].src), in6_ptop(tgt_ip))

        # Dest link-layer options should have the router's MAC
        dll = rx[ICMPv6NDOptDstLLAddr]
        self.assertEqual(dll.lladdr, intf.local_mac)

    def validate_ns(self, intf, rx, tgt_ip):
        nsma = in6_getnsma(inet_pton(AF_INET6, tgt_ip))
        dst_ip = inet_ntop(AF_INET6, nsma)

        # NS is broadcast
        self.assertEqual(rx[Ether].dst, in6_getnsmac(nsma))

        # and from the router's MAC
        self.assertEqual(rx[Ether].src, intf.local_mac)

        # the rx'd NS should be addressed to an mcast address
        # derived from the target address
        self.assertEqual(
            in6_ptop(rx[IPv6].dst), in6_ptop(dst_ip))

        # expect the tgt IP in the NS header
        ns = rx[ICMPv6ND_NS]
        self.assertEqual(in6_ptop(ns.tgt), in6_ptop(tgt_ip))

        # packet is from the router's local address
        self.assertEqual(
            in6_ptop(rx[IPv6].src), intf.local_ip6)

        # Src link-layer options should have the router's MAC
        sll = rx[ICMPv6NDOptSrcLLAddr]
        self.assertEqual(sll.lladdr, intf.local_mac)

    def send_and_expect_ra(self, intf, pkts, remark, dst_ip=None,
                           filter_out_fn=is_ipv6_misc):
        intf.add_stream(pkts)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()
        rx = intf.get_capture(1, filter_out_fn=filter_out_fn)

        self.assertEqual(len(rx), 1)
        rx = rx[0]
        self.validate_ra(intf, rx, dst_ip)

    def send_and_expect_na(self, intf, pkts, remark, dst_ip=None,
                           tgt_ip=None,
                           filter_out_fn=is_ipv6_misc):
        intf.add_stream(pkts)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()
        rx = intf.get_capture(1, filter_out_fn=filter_out_fn)

        self.assertEqual(len(rx), 1)
        rx = rx[0]
        self.validate_na(intf, rx, dst_ip, tgt_ip)

    def send_and_expect_ns(self, tx_intf, rx_intf, pkts, tgt_ip,
                           filter_out_fn=is_ipv6_misc):
        self.vapi.cli("clear trace")
        tx_intf.add_stream(pkts)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()
        rx = rx_intf.get_capture(1, filter_out_fn=filter_out_fn)

        self.assertEqual(len(rx), 1)
        rx = rx[0]
        self.validate_ns(rx_intf, rx, tgt_ip)

    def verify_ip(self, rx, smac, dmac, sip, dip):
        ether = rx[Ether]
        self.assertEqual(ether.dst, dmac)
        self.assertEqual(ether.src, smac)

        ip = rx[IPv6]
        self.assertEqual(ip.src, sip)
        self.assertEqual(ip.dst, dip)


@tag_run_solo
class TestIPv6(TestIPv6ND):
    """ IPv6 Test Case """

    @classmethod
    def setUpClass(cls):
        super(TestIPv6, cls).setUpClass()

    @classmethod
    def tearDownClass(cls):
        super(TestIPv6, cls).tearDownClass()

    def setUp(self):
        """
        Perform test setup before test case.

        **Config:**
            - create 3 pg interfaces
                - untagged pg0 interface
                - Dot1Q subinterface on pg1
                - Dot1AD subinterface on pg2
            - setup interfaces:
                - put it into UP state
                - set IPv6 addresses
                - resolve neighbor address using NDP
            - configure 200 fib entries

        :ivar list interfaces: pg interfaces and subinterfaces.
        :ivar dict flows: IPv4 packet flows in test.

        *TODO:* Create AD sub interface
        """
        super(TestIPv6, self).setUp()

        # create 3 pg interfaces
        self.create_pg_interfaces(range(3))

        # create 2 subinterfaces for p1 and pg2
        self.sub_interfaces = [
            VppDot1QSubint(self, self.pg1, 100),
            VppDot1QSubint(self, self.pg2, 200)
            # TODO: VppDot1ADSubint(self, self.pg2, 200, 300, 400)
        ]

        # packet flows mapping pg0 -> pg1.sub, pg2.sub, etc.
        self.flows = dict()
        self.flows[self.pg0] = [self.pg1.sub_if, self.pg2.sub_if]
        self.flows[self.pg1.sub_if] = [self.pg0, self.pg2.sub_if]
        self.flows[self.pg2.sub_if] = [self.pg0, self.pg1.sub_if]

        # packet sizes
        self.pg_if_packet_sizes = [64, 1500, 9020]

        self.interfaces = list(self.pg_interfaces)
        self.interfaces.extend(self.sub_interfaces)

        # setup all interfaces
        for i in self.interfaces:
            i.admin_up()
            i.config_ip6()
            i.resolve_ndp()

    def tearDown(self):
        """Run standard test teardown and log ``show ip6 neighbors``."""
        for i in self.interfaces:
            i.unconfig_ip6()
            i.admin_down()
        for i in self.sub_interfaces:
            i.remove_vpp_config()

        super(TestIPv6, self).tearDown()
        if not self.vpp_dead:
            self.logger.info(self.vapi.cli("show ip6 neighbors"))
            # info(self.vapi.cli("show ip6 fib"))  # many entries

    def modify_packet(self, src_if, packet_size, pkt):
        """Add load, set destination IP and extend packet to required packet
        size for defined interface.

        :param VppInterface src_if: Interface to create packet for.
        :param int packet_size: Required packet size.
        :param Scapy pkt: Packet to be modified.
        """
        dst_if_idx = int(packet_size / 10 % 2)
        dst_if = self.flows[src_if][dst_if_idx]
        info = self.create_packet_info(src_if, dst_if)
        payload = self.info_to_payload(info)
        p = pkt / Raw(payload)
        p[IPv6].dst = dst_if.remote_ip6
        info.data = p.copy()
        if isinstance(src_if, VppSubInterface):
            p = src_if.add_dot1_layer(p)
        self.extend_packet(p, packet_size)

        return p

    def create_stream(self, src_if):
        """Create input packet stream for defined interface.

        :param VppInterface src_if: Interface to create packet stream for.
        """
        hdr_ext = 4 if isinstance(src_if, VppSubInterface) else 0
        pkt_tmpl = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
                    IPv6(src=src_if.remote_ip6) /
                    inet6.UDP(sport=1234, dport=1234))

        pkts = [self.modify_packet(src_if, i, pkt_tmpl)
                for i in moves.range(self.pg_if_packet_sizes[0],
                                     self.pg_if_packet_sizes[1], 10)]
        pkts_b = [self.modify_packet(src_if, i, pkt_tmpl)
                  for i in moves.range(self.pg_if_packet_sizes[1] + hdr_ext,
                                       self.pg_if_packet_sizes[2] + hdr_ext,
                                       50)]
        pkts.extend(pkts_b)

        return pkts

    def verify_capture(self, dst_if, capture):
        """Verify captured input packet stream for defined interface.

        :param VppInterface dst_if: Interface to verify captured packet stream
                                    for.
        :param list capture: Captured packet stream.
        """
        self.logger.info("Verifying capture on interface %s" % dst_if.name)
        last_info = dict()
        for i in self.interfaces:
            last_info[i.sw_if_index] = None
        is_sub_if = False
        dst_sw_if_index = dst_if.sw_if_index
        if hasattr(dst_if, 'parent'):
            is_sub_if = True
        for packet in capture:
            if is_sub_if:
                # Check VLAN tags and Ethernet header
                packet = dst_if.remove_dot1_layer(packet)
            self.assertTrue(Dot1Q not in packet)
            try:
                ip = packet[IPv6]
                udp = packet[inet6.UDP]
                payload_info = self.payload_to_info(packet[Raw])
                packet_index = payload_info.index
                self.assertEqual(payload_info.dst, dst_sw_if_index)
                self.logger.debug(
                    "Got packet on port %s: src=%u (id=%u)" %
                    (dst_if.name, payload_info.src, packet_index))
                next_info = self.get_next_packet_info_for_interface2(
                    payload_info.src, dst_sw_if_index,
                    last_info[payload_info.src])
                last_info[payload_info.src] = next_info
                self.assertTrue(next_info is not None)
                self.assertEqual(packet_index, next_info.index)
                saved_packet = next_info.data
                # Check standard fields
                self.assertEqual(
                    ip.src, saved_packet[IPv6].src)
                self.assertEqual(
                    ip.dst, saved_packet[IPv6].dst)
                self.assertEqual(
                    udp.sport, saved_packet[inet6.UDP].sport)
                self.assertEqual(
                    udp.dport, saved_packet[inet6.UDP].dport)
            except:
                self.logger.error(ppp("Unexpected or invalid packet:", packet))
                raise
        for i in self.interfaces:
            remaining_packet = self.get_next_packet_info_for_interface2(
                i.sw_if_index, dst_sw_if_index, last_info[i.sw_if_index])
            self.assertTrue(remaining_packet is None,
                            "Interface %s: Packet expected from interface %s "
                            "didn't arrive" % (dst_if.name, i.name))

    def test_next_header_anomaly(self):
        """ IPv6 next header anomaly test

        Test scenario:
            - ipv6 next header field = Fragment Header (44)
            - next header is ICMPv6 Echo Request
            - wait for reassembly
        """
        pkt = (Ether(src=self.pg0.local_mac, dst=self.pg0.remote_mac) /
               IPv6(src=self.pg0.remote_ip6, dst=self.pg0.local_ip6, nh=44) /
               ICMPv6EchoRequest())

        self.pg0.add_stream(pkt)
        self.pg_start()

        # wait for reassembly
        self.sleep(10)

    def test_fib(self):
        """ IPv6 FIB test

        Test scenario:
            - Create IPv6 stream for pg0 interface
            - Create IPv6 tagged streams for pg1's and pg2's subinterface.
            - Send and verify received packets on each interface.
        """

        pkts = self.create_stream(self.pg0)
        self.pg0.add_stream(pkts)

        for i in self.sub_interfaces:
            pkts = self.create_stream(i)
            i.parent.add_stream(pkts)

        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        pkts = self.pg0.get_capture()
        self.verify_capture(self.pg0, pkts)

        for i in self.sub_interfaces:
            pkts = i.parent.get_capture()
            self.verify_capture(i, pkts)

    def test_ns(self):
        """ IPv6 Neighbour Solicitation Exceptions

        Test scenario:
           - Send an NS Sourced from an address not covered by the link sub-net
           - Send an NS to an mcast address the router has not joined
           - Send NS for a target address the router does not onn.
        """

        #
        # An NS from a non link source address
        #
        nsma = in6_getnsma(inet_pton(AF_INET6, self.pg0.local_ip6))
        d = inet_ntop(AF_INET6, nsma)

        p = (Ether(dst=in6_getnsmac(nsma)) /
             IPv6(dst=d, src="2002::2") /
             ICMPv6ND_NS(tgt=self.pg0.local_ip6) /
             ICMPv6NDOptSrcLLAddr(
                 lladdr=self.pg0.remote_mac))
        pkts = [p]

        self.send_and_assert_no_replies(
            self.pg0, pkts,
            "No response to NS source by address not on sub-net")

        #
        # An NS for sent to a solicited mcast group the router is
        # not a member of FAILS
        #
        if 0:
            nsma = in6_getnsma(inet_pton(AF_INET6, "fd::ffff"))
            d = inet_ntop(AF_INET6, nsma)

            p = (Ether(dst=in6_getnsmac(nsma)) /
                 IPv6(dst=d, src=self.pg0.remote_ip6) /
                 ICMPv6ND_NS(tgt=self.pg0.local_ip6) /
                 ICMPv6NDOptSrcLLAddr(
                     lladdr=self.pg0.remote_mac))
            pkts = [p]

            self.send_and_assert_no_replies(
                self.pg0, pkts,
                "No response to NS sent to unjoined mcast address")

        #
        # An NS whose target address is one the router does not own
        #
        nsma = in6_getnsma(inet_pton(AF_INET6, self.pg0.local_ip6))
        d = inet_ntop(AF_INET6, nsma)

        p = (Ether(dst=in6_getnsmac(nsma)) /
             IPv6(dst=d, src=self.pg0.remote_ip6) /
             ICMPv6ND_NS(tgt="fd::ffff") /
             ICMPv6NDOptSrcLLAddr(
                 lladdr=self.pg0.remote_mac))
        pkts = [p]

        self.send_and_assert_no_replies(self.pg0, pkts,
                                        "No response to NS for unknown target")

        #
        # A neighbor entry that has no associated FIB-entry
        #
        self.pg0.generate_remote_hosts(4)
        nd_entry = VppNeighbor(self,
                               self.pg0.sw_if_index,
                               self.pg0.remote_hosts[2].mac,
                               self.pg0.remote_hosts[2].ip6,
                               is_no_fib_entry=1)
        nd_entry.add_vpp_config()

        #
        # check we have the neighbor, but no route
        #
        self.assertTrue(find_nbr(self,
                                 self.pg0.sw_if_index,
                                 self.pg0._remote_hosts[2].ip6))
        self.assertFalse(find_route(self,
                                    self.pg0._remote_hosts[2].ip6,
                                    128))

        #
        # send an NS from a link local address to the interface's global
        # address
        #
        p = (Ether(dst=in6_getnsmac(nsma), src=self.pg0.remote_mac) /
             IPv6(
                 dst=d, src=self.pg0._remote_hosts[2].ip6_ll) /
             ICMPv6ND_NS(tgt=self.pg0.local_ip6) /
             ICMPv6NDOptSrcLLAddr(
                 lladdr=self.pg0.remote_mac))

        self.send_and_expect_na(self.pg0, p,
                                "NS from link-local",
                                dst_ip=self.pg0._remote_hosts[2].ip6_ll,
                                tgt_ip=self.pg0.local_ip6)

        #
        # we should have learned an ND entry for the peer's link-local
        # but not inserted a route to it in the FIB
        #
        self.assertTrue(find_nbr(self,
                                 self.pg0.sw_if_index,
                                 self.pg0._remote_hosts[2].ip6_ll))
        self.assertFalse(find_route(self,
                                    self.pg0._remote_hosts[2].ip6_ll,
                                    128))

        #
        # An NS to the router's own Link-local
        #
        p = (Ether(dst=in6_getnsmac(nsma), src=self.pg0.remote_mac) /
             IPv6(
                 dst=d, src=self.pg0._remote_hosts[3].ip6_ll) /
             ICMPv6ND_NS(tgt=self.pg0.local_ip6_ll) /
             ICMPv6NDOptSrcLLAddr(
                 lladdr=self.pg0.remote_mac))

        self.send_and_expect_na(self.pg0, p,
                                "NS to/from link-local",
                                dst_ip=self.pg0._remote_hosts[3].ip6_ll,
                                tgt_ip=self.pg0.local_ip6_ll)

        #
        # we should have learned an ND entry for the peer's link-local
        # but not inserted a route to it in the FIB
        #
        self.assertTrue(find_nbr(self,
                                 self.pg0.sw_if_index,
                                 self.pg0._remote_hosts[3].ip6_ll))
        self.assertFalse(find_route(self,
                                    self.pg0._remote_hosts[3].ip6_ll,
                                    128))

    def test_ns_duplicates(self):
        """ ND Duplicates"""

        #
        # Generate some hosts on the LAN
        #
        self.pg1.generate_remote_hosts(3)

        #
        # Add host 1 on pg1 and pg2
        #
        ns_pg1 = VppNeighbor(self,
                             self.pg1.sw_if_index,
                             self.pg1.remote_hosts[1].mac,
                             self.pg1.remote_hosts[1].ip6)
        ns_pg1.add_vpp_config()
        ns_pg2 = VppNeighbor(self,
                             self.pg2.sw_if_index,
                             self.pg2.remote_mac,
                             self.pg1.remote_hosts[1].ip6)
        ns_pg2.add_vpp_config()

        #
        # IP packet destined for pg1 remote host arrives on pg1 again.
        #
        p = (Ether(dst=self.pg0.local_mac,
                   src=self.pg0.remote_mac) /
             IPv6(src=self.pg0.remote_ip6,
                  dst=self.pg1.remote_hosts[1].ip6) /
             inet6.UDP(sport=1234, dport=1234) /
             Raw())

        self.pg0.add_stream(p)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx1 = self.pg1.get_capture(1)

        self.verify_ip(rx1[0],
                       self.pg1.local_mac,
                       self.pg1.remote_hosts[1].mac,
                       self.pg0.remote_ip6,
                       self.pg1.remote_hosts[1].ip6)

        #
        # remove the duplicate on pg1
        # packet stream should generate NSs out of pg1
        #
        ns_pg1.remove_vpp_config()

        self.send_and_expect_ns(self.pg0, self.pg1,
                                p, self.pg1.remote_hosts[1].ip6)

        #
        # Add it back
        #
        ns_pg1.add_vpp_config()

        self.pg0.add_stream(p)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx1 = self.pg1.get_capture(1)

        self.verify_ip(rx1[0],
                       self.pg1.local_mac,
                       self.pg1.remote_hosts[1].mac,
                       self.pg0.remote_ip6,
                       self.pg1.remote_hosts[1].ip6)

    def validate_ra(self, intf, rx, dst_ip=None, src_ip=None,
                    mtu=9000, pi_opt=None):
        if not dst_ip:
            dst_ip = intf.remote_ip6
        if not src_ip:
            src_ip = mk_ll_addr(intf.local_mac)

        # unicasted packets must come to the unicast mac
        self.assertEqual(rx[Ether].dst, intf.remote_mac)

        # and from the router's MAC
        self.assertEqual(rx[Ether].src, intf.local_mac)

        # the rx'd RA should be addressed to the sender's source
        self.assertTrue(rx.haslayer(ICMPv6ND_RA))
        self.assertEqual(in6_ptop(rx[IPv6].dst),
                         in6_ptop(dst_ip))

        # and come from the router's link local
        self.assertTrue(in6_islladdr(rx[IPv6].src))
        self.assertEqual(in6_ptop(rx[IPv6].src), in6_ptop(src_ip))

        # it should contain the links MTU
        ra = rx[ICMPv6ND_RA]
        self.assertEqual(ra[ICMPv6NDOptMTU].mtu, mtu)

        # it should contain the source's link layer address option
        sll = ra[ICMPv6NDOptSrcLLAddr]
        self.assertEqual(sll.lladdr, intf.local_mac)

        if not pi_opt:
            # the RA should not contain prefix information
            self.assertFalse(ra.haslayer(
                ICMPv6NDOptPrefixInfo))
        else:
            raos = rx.getlayer(ICMPv6NDOptPrefixInfo, 1)

            # the options are nested in the scapy packet in way that i cannot
            # decipher how to decode. this 1st layer of option always returns
            # nested classes, so a direct obj1=obj2 comparison always fails.
            # however, the getlayer(.., 2) does give one instance.
            # so we cheat here and construct a new opt instance for comparison
            rd = ICMPv6NDOptPrefixInfo(
                prefixlen=raos.prefixlen,
                prefix=raos.prefix,
                L=raos.L,
                A=raos.A)
            if type(pi_opt) is list:
                for ii in range(len(pi_opt)):
                    self.assertEqual(pi_opt[ii], rd)
                    rd = rx.getlayer(
                        ICMPv6NDOptPrefixInfo, ii + 2)
            else:
                self.assertEqual(pi_opt, raos, 'Expected: %s, received: %s'
                                 % (pi_opt.show(dump=True),
                                    raos.show(dump=True)))

    def send_and_expect_ra(self, intf, pkts, remark, dst_ip=None,
                           filter_out_fn=is_ipv6_misc,
                           opt=None,
                           src_ip=None):
        self.vapi.cli("clear trace")
        intf.add_stream(pkts)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()
        rx = intf.get_capture(1, filter_out_fn=filter_out_fn)

        self.assertEqual(len(rx), 1)
        rx = rx[0]
        self.validate_ra(intf, rx, dst_ip, src_ip=src_ip, pi_opt=opt)

    def test_rs(self):
        """ IPv6 Router Solicitation Exceptions

        Test scenario:
        """

        #
        # Before we begin change the IPv6 RA responses to use the unicast
        # address - that way we will not confuse them with the periodic
        # RAs which go to the mcast address
        # Sit and wait for the first periodic RA.
        #
        # TODO
        #
        self.pg0.ip6_ra_config(send_unicast=1)

        #
        # An RS from a link source address
        #  - expect an RA in return
        #
        p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
             IPv6(dst=self.pg0.local_ip6, src=self.pg0.remote_ip6) /
             ICMPv6ND_RS())
        pkts = [p]
        self.send_and_expect_ra(self.pg0, pkts, "Genuine RS")

        #
        # For the next RS sent the RA should be rate limited
        #
        self.send_and_assert_no_replies(self.pg0, pkts, "RA rate limited")

        #
        # When we reconfigure the IPv6 RA config,
        # we reset the RA rate limiting,
        # so we need to do this before each test below so as not to drop
        # packets for rate limiting reasons. Test this works here.
        #
        self.pg0.ip6_ra_config(send_unicast=1)
        self.send_and_expect_ra(self.pg0, pkts, "Rate limit reset RS")

        #
        # An RS sent from a non-link local source
        #
        self.pg0.ip6_ra_config(send_unicast=1)
        p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
             IPv6(dst=self.pg0.local_ip6,
                  src="2002::ffff") /
             ICMPv6ND_RS())
        pkts = [p]
        self.send_and_assert_no_replies(self.pg0, pkts,
                                        "RS from non-link source")

        #
        # Source an RS from a link local address
        #
        self.pg0.ip6_ra_config(send_unicast=1)
        ll = mk_ll_addr(self.pg0.remote_mac)
        p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
             IPv6(dst=self.pg0.local_ip6, src=ll) /
             ICMPv6ND_RS())
        pkts = [p]
        self.send_and_expect_ra(self.pg0, pkts,
                                "RS sourced from link-local",
                                dst_ip=ll)

        #
        # Send the RS multicast
        #
        self.pg0.ip6_ra_config(send_unicast=1)
        dmac = in6_getnsmac(inet_pton(AF_INET6, "ff02::2"))
        ll = mk_ll_addr(self.pg0.remote_mac)
        p = (Ether(dst=dmac, src=self.pg0.remote_mac) /
             IPv6(dst="ff02::2", src=ll) /
             ICMPv6ND_RS())
        pkts = [p]
        self.send_and_expect_ra(self.pg0, pkts,
                                "RS sourced from link-local",
                                dst_ip=ll)

        #
        # Source from the unspecified address ::. This happens when the RS
        # is sent before the host has a configured address/sub-net,
        # i.e. auto-config. Since the sender has no IP address, the reply
        # comes back mcast - so the capture needs to not filter this.
        # If we happen to pick up the periodic RA at this point then so be it,
        # it's not an error.
        #
        self.pg0.ip6_ra_config(send_unicast=1, suppress=1)
        p = (Ether(dst=dmac, src=self.pg0.remote_mac) /
             IPv6(dst="ff02::2", src="::") /
             ICMPv6ND_RS())
        pkts = [p]
        self.send_and_expect_ra(self.pg0, pkts,
                                "RS sourced from unspecified",
                                dst_ip="ff02::1",
                                filter_out_fn=None)

        #
        # Configure The RA to announce the links prefix
        #
        self.pg0.ip6_ra_prefix('%s/%s' % (self.pg0.local_ip6,
                               self.pg0.local_ip6_prefix_len))

        #
        # RAs should now contain the prefix information option
        #
        opt = ICMPv6NDOptPrefixInfo(
            prefixlen=self.pg0.local_ip6_prefix_len,
            prefix=self.pg0.local_ip6,
            L=1,
            A=1)

        self.pg0.ip6_ra_config(send_unicast=1)
        ll = mk_ll_addr(self.pg0.remote_mac)
        p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
             IPv6(dst=self.pg0.local_ip6, src=ll) /
             ICMPv6ND_RS())
        self.send_and_expect_ra(self.pg0, p,
                                "RA with prefix-info",
                                dst_ip=ll,
                                opt=opt)

        #
        # Change the prefix info to not off-link
        #  L-flag is clear
        #
        self.pg0.ip6_ra_prefix('%s/%s' % (self.pg0.local_ip6,
                               self.pg0.local_ip6_prefix_len),
                               off_link=1)

        opt = ICMPv6NDOptPrefixInfo(
            prefixlen=self.pg0.local_ip6_prefix_len,
            prefix=self.pg0.local_ip6,
            L=0,
            A=1)

        self.pg0.ip6_ra_config(send_unicast=1)
        self.send_and_expect_ra(self.pg0, p,
                                "RA with Prefix info with L-flag=0",
                                dst_ip=ll,
                                opt=opt)

        #
        # Change the prefix info to not off-link, no-autoconfig
        #  L and A flag are clear in the advert
        #
        self.pg0.ip6_ra_prefix('%s/%s' % (self.pg0.local_ip6,
                               self.pg0.local_ip6_prefix_len),
                               off_link=1,
                               no_autoconfig=1)

        opt = ICMPv6NDOptPrefixInfo(
            prefixlen=self.pg0.local_ip6_prefix_len,
            prefix=self.pg0.local_ip6,
            L=0,
            A=0)

        self.pg0.ip6_ra_config(send_unicast=1)
        self.send_and_expect_ra(self.pg0, p,
                                "RA with Prefix info with A & L-flag=0",
                                dst_ip=ll,
                                opt=opt)

        #
        # Change the flag settings back to the defaults
        #  L and A flag are set in the advert
        #
        self.pg0.ip6_ra_prefix('%s/%s' % (self.pg0.local_ip6,
                               self.pg0.local_ip6_prefix_len))

        opt = ICMPv6NDOptPrefixInfo(
            prefixlen=self.pg0.local_ip6_prefix_len,
            prefix=self.pg0.local_ip6,
            L=1,
            A=1)

        self.pg0.ip6_ra_config(send_unicast=1)
        self.send_and_expect_ra(self.pg0, p,
                                "RA with Prefix info",
                                dst_ip=ll,
                                opt=opt)

        #
        # Change the prefix info to not off-link, no-autoconfig
        #  L and A flag are clear in the advert
        #
        self.pg0.ip6_ra_prefix('%s/%s' % (self.pg0.local_ip6,
                               self.pg0.local_ip6_prefix_len),
                               off_link=1,
                               no_autoconfig=1)

        opt = ICMPv6NDOptPrefixInfo(
            prefixlen=self.pg0.local_ip6_prefix_len,
            prefix=self.pg0.local_ip6,
            L=0,
            A=0)

        self.pg0.ip6_ra_config(send_unicast=1)
        self.send_and_expect_ra(self.pg0, p,
                                "RA with Prefix info with A & L-flag=0",
                                dst_ip=ll,
                                opt=opt)

        #
        # Use the reset to defaults option to revert to defaults
        #  L and A flag are clear in the advert
        #
        self.pg0.ip6_ra_prefix('%s/%s' % (self.pg0.local_ip6,
                               self.pg0.local_ip6_prefix_len),
                               use_default=1)

        opt = ICMPv6NDOptPrefixInfo(
            prefixlen=self.pg0.local_ip6_prefix_len,
            prefix=self.pg0.local_ip6,
            L=1,
            A=1)

        self.pg0.ip6_ra_config(send_unicast=1)
        self.send_and_expect_ra(self.pg0, p,
                                "RA with Prefix reverted to defaults",
                                dst_ip=ll,
                                opt=opt)

        #
        # Advertise Another prefix. With no L-flag/A-flag
        #
        self.pg0.ip6_ra_prefix('%s/%s' % (self.pg1.local_ip6,
                               self.pg1.local_ip6_prefix_len),
                               off_link=1,
                               no_autoconfig=1)

        opt = [ICMPv6NDOptPrefixInfo(
            prefixlen=self.pg0.local_ip6_prefix_len,
            prefix=self.pg0.local_ip6,
            L=1,
            A=1),
            ICMPv6NDOptPrefixInfo(
                prefixlen=self.pg1.local_ip6_prefix_len,
                prefix=self.pg1.local_ip6,
                L=0,
                A=0)]

        self.pg0.ip6_ra_config(send_unicast=1)
        ll = mk_ll_addr(self.pg0.remote_mac)
        p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
             IPv6(dst=self.pg0.local_ip6, src=ll) /
             ICMPv6ND_RS())
        self.send_and_expect_ra(self.pg0, p,
                                "RA with multiple Prefix infos",
                                dst_ip=ll,
                                opt=opt)

        #
        # Remove the first prefix-info - expect the second is still in the
        # advert
        #
        self.pg0.ip6_ra_prefix('%s/%s' % (self.pg0.local_ip6,
                               self.pg0.local_ip6_prefix_len),
                               is_no=1)

        opt = ICMPv6NDOptPrefixInfo(
            prefixlen=self.pg1.local_ip6_prefix_len,
            prefix=self.pg1.local_ip6,
            L=0,
            A=0)

        self.pg0.ip6_ra_config(send_unicast=1)
        self.send_and_expect_ra(self.pg0, p,
                                "RA with Prefix reverted to defaults",
                                dst_ip=ll,
                                opt=opt)

        #
        # Remove the second prefix-info - expect no prefix-info in the adverts
        #
        self.pg0.ip6_ra_prefix('%s/%s' % (self.pg1.local_ip6,
                               self.pg1.local_ip6_prefix_len),
                               is_no=1)

        #
        # change the link's link local, so we know that works too.
        #
        self.vapi.sw_interface_ip6_set_link_local_address(
            sw_if_index=self.pg0.sw_if_index,
            ip="fe80::88")

        self.pg0.ip6_ra_config(send_unicast=1)
        self.send_and_expect_ra(self.pg0, p,
                                "RA with Prefix reverted to defaults",
                                dst_ip=ll,
                                src_ip="fe80::88")

        #
        # Reset the periodic advertisements back to default values
        #
        self.pg0.ip6_ra_config(no=1, suppress=1, send_unicast=0)

    def test_mld(self):
        """ MLD Report """
        #
        # test one MLD is sent after applying an IPv6 Address on an interface
        #
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        subitf = VppDot1QSubint(self, self.pg1, 99)

        subitf.admin_up()
        subitf.config_ip6()

        rxs = self.pg1._get_capture(timeout=4, filter_out_fn=None)

        #
        # hunt for the MLD on vlan 99
        #
        for rx in rxs:
            # make sure ipv6 packets with hop by hop options have
            # correct checksums
            self.assert_packet_checksums_valid(rx)
            if rx.haslayer(IPv6ExtHdrHopByHop) and \
               rx.haslayer(Dot1Q) and \
               rx[Dot1Q].vlan == 99:
                mld = rx[ICMPv6MLReport2]

        self.assertEqual(mld.records_number, 4)


class TestIPv6RouteLookup(VppTestCase):
    """ IPv6 Route Lookup Test Case """
    routes = []

    def route_lookup(self, prefix, exact):
        return self.vapi.api(self.vapi.papi.ip_route_lookup,
                             {
                                 'table_id': 0,
                                 'exact': exact,
                                 'prefix': prefix,
                             })

    @classmethod
    def setUpClass(cls):
        super(TestIPv6RouteLookup, cls).setUpClass()

    @classmethod
    def tearDownClass(cls):
        super(TestIPv6RouteLookup, cls).tearDownClass()

    def setUp(self):
        super(TestIPv6RouteLookup, self).setUp()

        drop_nh = VppRoutePath("::1", 0xffffffff,
                               type=FibPathType.FIB_PATH_TYPE_DROP)

        # Add 3 routes
        r = VppIpRoute(self, "2001:1111::", 32, [drop_nh])
        r.add_vpp_config()
        self.routes.append(r)

        r = VppIpRoute(self, "2001:1111:2222::", 48, [drop_nh])
        r.add_vpp_config()
        self.routes.append(r)

        r = VppIpRoute(self, "2001:1111:2222::1", 128, [drop_nh])
        r.add_vpp_config()
        self.routes.append(r)

    def tearDown(self):
        # Remove the routes we added
        for r in self.routes:
            r.remove_vpp_config()

        super(TestIPv6RouteLookup, self).tearDown()

    def test_exact_match(self):
        # Verify we find the host route
        prefix = "2001:1111:2222::1/128"
        result = self.route_lookup(prefix, True)
        assert (prefix == str(result.route.prefix))

        # Verify we find a middle prefix route
        prefix = "2001:1111:2222::/48"
        result = self.route_lookup(prefix, True)
        assert (prefix == str(result.route.prefix))

        # Verify we do not find an available LPM.
        with self.vapi.assert_negative_api_retval():
            self.route_lookup("2001::2/128", True)

    def test_longest_prefix_match(self):
        # verify we find lpm
        lpm_prefix = "2001:1111:2222::/48"
        result = self.route_lookup("2001:1111:2222::2/128", False)
        assert (lpm_prefix == str(result.route.prefix))

        # Verify we find the exact when not requested
        result = self.route_lookup(lpm_prefix, False)
        assert (lpm_prefix == str(result.route.prefix))

        # Can't seem to delete the default route so no negative LPM test.


class TestIPv6IfAddrRoute(VppTestCase):
    """ IPv6 Interface Addr Route Test Case """

    @classmethod
    def setUpClass(cls):
        super(TestIPv6IfAddrRoute, cls).setUpClass()

    @classmethod
    def tearDownClass(cls):
        super(TestIPv6IfAddrRoute, cls).tearDownClass()

    def setUp(self):
        super(TestIPv6IfAddrRoute, self).setUp()

        # create 1 pg interface
        self.create_pg_interfaces(range(1))

        for i in self.pg_interfaces:
            i.admin_up()
            i.config_ip6()
            i.resolve_ndp()

    def tearDown(self):
        super(TestIPv6IfAddrRoute, self).tearDown()
        for i in self.pg_interfaces:
            i.unconfig_ip6()
            i.admin_down()

    def test_ipv6_ifaddrs_same_prefix(self):
        """ IPv6 Interface Addresses Same Prefix test

        Test scenario:

            - Verify no route in FIB for prefix 2001:10::/64
            - Configure IPv4 address 2001:10::10/64  on an interface
            - Verify route in FIB for prefix 2001:10::/64
            - Configure IPv4 address 2001:10::20/64 on an interface
            - Delete 2001:10::10/64 from interface
            - Verify route in FIB for prefix 2001:10::/64
            - Delete 2001:10::20/64 from interface
            - Verify no route in FIB for prefix 2001:10::/64
        """

        addr1 = "2001:10::10"
        addr2 = "2001:10::20"

        if_addr1 = VppIpInterfaceAddress(self, self.pg0, addr1, 64)
        if_addr2 = VppIpInterfaceAddress(self, self.pg0, addr2, 64)
        self.assertFalse(if_addr1.query_vpp_config())
        self.assertFalse(find_route(self, addr1, 128))
        self.assertFalse(find_route(self, addr2, 128))

        # configure first address, verify route present
        if_addr1.add_vpp_config()
        self.assertTrue(if_addr1.query_vpp_config())
        self.assertTrue(find_route(self, addr1, 128))
        self.assertFalse(find_route(self, addr2, 128))

        # configure second address, delete first, verify route not removed
        if_addr2.add_vpp_config()
        if_addr1.remove_vpp_config()
        self.assertFalse(if_addr1.query_vpp_config())
        self.assertTrue(if_addr2.query_vpp_config())
        self.assertFalse(find_route(self, addr1, 128))
        self.assertTrue(find_route(self, addr2, 128))

        # delete second address, verify route removed
        if_addr2.remove_vpp_config()
        self.assertFalse(if_addr1.query_vpp_config())
        self.assertFalse(find_route(self, addr1, 128))
        self.assertFalse(find_route(self, addr2, 128))

    def test_ipv6_ifaddr_del(self):
        """ Delete an interface address that does not exist """

        loopbacks = self.create_loopback_interfaces(1)
        lo = self.lo_interfaces[0]

        lo.config_ip6()
        lo.admin_up()

        #
        # try and remove pg0's subnet from lo
        #
        with self.vapi.assert_negative_api_retval():
            self.vapi.sw_interface_add_del_address(
                sw_if_index=lo.sw_if_index,
                prefix=self.pg0.local_ip6_prefix,
                is_add=0)


class TestICMPv6Echo(VppTestCase):
    """ ICMPv6 Echo Test Case """

    @classmethod
    def setUpClass(cls):
        super(TestICMPv6Echo, cls).setUpClass()

    @classmethod
    def tearDownClass(cls):
        super(TestICMPv6Echo, cls).tearDownClass()

    def setUp(self):
        super(TestICMPv6Echo, self).setUp()

        # create 1 pg interface
        self.create_pg_interfaces(range(1))

        for i in self.pg_interfaces:
            i.admin_up()
            i.config_ip6()
            i.resolve_ndp(link_layer=True)
            i.resolve_ndp()

    def tearDown(self):
        super(TestICMPv6Echo, self).tearDown()
        for i in self.pg_interfaces:
            i.unconfig_ip6()
            i.admin_down()

    def test_icmpv6_echo(self):
        """ VPP replies to ICMPv6 Echo Request

        Test scenario:

            - Receive ICMPv6 Echo Request message on pg0 interface.
            - Check outgoing ICMPv6 Echo Reply message on pg0 interface.
        """

        # test both with global and local ipv6 addresses
        dsts = (self.pg0.local_ip6, self.pg0.local_ip6_ll)
        id = 0xb
        seq = 5
        data = b'\x0a' * 18
        p = list()
        for dst in dsts:
            p.append((Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
                      IPv6(src=self.pg0.remote_ip6, dst=dst) /
                      ICMPv6EchoRequest(id=id, seq=seq, data=data)))

        self.pg0.add_stream(p)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()
        rxs = self.pg0.get_capture(len(dsts))

        for rx, dst in zip(rxs, dsts):
            ether = rx[Ether]
            ipv6 = rx[IPv6]
            icmpv6 = rx[ICMPv6EchoReply]
            self.assertEqual(ether.src, self.pg0.local_mac)
            self.assertEqual(ether.dst, self.pg0.remote_mac)
            self.assertEqual(ipv6.src, dst)
            self.assertEqual(ipv6.dst, self.pg0.remote_ip6)
            self.assertEqual(icmp6types[icmpv6.type], "Echo Reply")
            self.assertEqual(icmpv6.id, id)
            self.assertEqual(icmpv6.seq, seq)
            self.assertEqual(icmpv6.data, data)


class TestIPv6RD(TestIPv6ND):
    """ IPv6 Router Discovery Test Case """

    @classmethod
    def setUpClass(cls):
        super(TestIPv6RD, cls).setUpClass()

    @classmethod
    def tearDownClass(cls):
        super(TestIPv6RD, cls).tearDownClass()

    def setUp(self):
        super(TestIPv6RD, self).setUp()

        # create 2 pg interfaces
        self.create_pg_interfaces(range(2))

        self.interfaces = list(self.pg_interfaces)

        # setup all interfaces
        for i in self.interfaces:
            i.admin_up()
            i.config_ip6()

    def tearDown(self):
        for i in self.interfaces:
            i.unconfig_ip6()
            i.admin_down()
        super(TestIPv6RD, self).tearDown()

    def test_rd_send_router_solicitation(self):
        """ Verify router solicitation packets """

        count = 2
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()
        self.vapi.ip6nd_send_router_solicitation(self.pg1.sw_if_index,
                                                 mrc=count)
        rx_list = self.pg1.get_capture(count, timeout=3)
        self.assertEqual(len(rx_list), count)
        for packet in rx_list:
            self.assertEqual(packet.haslayer(IPv6), 1)
            self.assertEqual(packet[IPv6].haslayer(
                ICMPv6ND_RS), 1)
            dst = ip6_normalize(packet[IPv6].dst)
            dst2 = ip6_normalize("ff02::2")
            self.assert_equal(dst, dst2)
            src = ip6_normalize(packet[IPv6].src)
            src2 = ip6_normalize(self.pg1.local_ip6_ll)
            self.assert_equal(src, src2)
            self.assertTrue(
                bool(packet[ICMPv6ND_RS].haslayer(
                    ICMPv6NDOptSrcLLAddr)))
            self.assert_equal(
                packet[ICMPv6NDOptSrcLLAddr].lladdr,
                self.pg1.local_mac)

    def verify_prefix_info(self, reported_prefix, prefix_option):
        prefix = IPv6Network(
            text_type(prefix_option.getfieldval("prefix") +
                      "/" +
                      text_type(prefix_option.getfieldval("prefixlen"))),
            strict=False)
        self.assert_equal(reported_prefix.prefix.network_address,
                          prefix.network_address)
        L = prefix_option.getfieldval("L")
        A = prefix_option.getfieldval("A")
        option_flags = (L << 7) | (A << 6)
        self.assert_equal(reported_prefix.flags, option_flags)
        self.assert_equal(reported_prefix.valid_time,
                          prefix_option.getfieldval("validlifetime"))
        self.assert_equal(reported_prefix.preferred_time,
                          prefix_option.getfieldval("preferredlifetime"))

    def test_rd_receive_router_advertisement(self):
        """ Verify events triggered by received RA packets """

        self.vapi.want_ip6_ra_events(enable=1)

        prefix_info_1 = ICMPv6NDOptPrefixInfo(
            prefix="1::2",
            prefixlen=50,
            validlifetime=200,
            preferredlifetime=500,
            L=1,
            A=1,
        )

        prefix_info_2 = ICMPv6NDOptPrefixInfo(
            prefix="7::4",
            prefixlen=20,
            validlifetime=70,
            preferredlifetime=1000,
            L=1,
            A=0,
        )

        p = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) /
             IPv6(dst=self.pg1.local_ip6_ll,
                  src=mk_ll_addr(self.pg1.remote_mac)) /
             ICMPv6ND_RA() /
             prefix_info_1 /
             prefix_info_2)
        self.pg1.add_stream([p])
        self.pg_start()

        ev = self.vapi.wait_for_event(10, "ip6_ra_event")

        self.assert_equal(ev.current_hop_limit, 0)
        self.assert_equal(ev.flags, 8)
        self.assert_equal(ev.router_lifetime_in_sec, 1800)
        self.assert_equal(ev.neighbor_reachable_time_in_msec, 0)
        self.assert_equal(
            ev.time_in_msec_between_retransmitted_neighbor_solicitations, 0)

        self.assert_equal(ev.n_prefixes, 2)

        self.verify_prefix_info(ev.prefixes[0], prefix_info_1)
        self.verify_prefix_info(ev.prefixes[1], prefix_info_2)


class TestIPv6RDControlPlane(TestIPv6ND):
    """ IPv6 Router Discovery Control Plane Test Case """

    @classmethod
    def setUpClass(cls):
        super(TestIPv6RDControlPlane, cls).setUpClass()

    @classmethod
    def tearDownClass(cls):
        super(TestIPv6RDControlPlane, cls).tearDownClass()

    def setUp(self):
        super(TestIPv6RDControlPlane, self).setUp()

        # create 1 pg interface
        self.create_pg_interfaces(range(1))

        self.interfaces = list(self.pg_interfaces)

        # setup all interfaces
        for i in self.interfaces:
            i.admin_up()
            i.config_ip6()

    def tearDown(self):
        super(TestIPv6RDControlPlane, self).tearDown()

    @staticmethod
    def create_ra_packet(pg, routerlifetime=None):
        src_ip = pg.remote_ip6_ll
        dst_ip = pg.local_ip6
        if routerlifetime is not None:
            ra = ICMPv6ND_RA(routerlifetime=routerlifetime)
        else:
            ra = ICMPv6ND_RA()
        p = (Ether(dst=pg.local_mac, src=pg.remote_mac) /
             IPv6(dst=dst_ip, src=src_ip) / ra)
        return p

    @staticmethod
    def get_default_routes(fib):
        list = []
        for entry in fib:
            if entry.route.prefix.prefixlen == 0:
                for path in entry.route.paths:
                    if path.sw_if_index != 0xFFFFFFFF:
                        defaut_route = {}
                        defaut_route['sw_if_index'] = path.sw_if_index
                        defaut_route['next_hop'] = path.nh.address.ip6
                        list.append(defaut_route)
        return list

    @staticmethod
    def get_interface_addresses(fib, pg):
        list = []
        for entry in fib:
            if entry.route.prefix.prefixlen == 128:
                path = entry.route.paths[0]
                if path.sw_if_index == pg.sw_if_index:
                    list.append(str(entry.route.prefix.network_address))
        return list

    def wait_for_no_default_route(self, n_tries=50, s_time=1):
        while (n_tries):
            fib = self.vapi.ip_route_dump(0, True)
            default_routes = self.get_default_routes(fib)
            if 0 == len(default_routes):
                return True
            n_tries = n_tries - 1
            self.sleep(s_time)

        return False

    def test_all(self):
        """ Test handling of SLAAC addresses and default routes """

        fib = self.vapi.ip_route_dump(0, True)
        default_routes = self.get_default_routes(fib)
        initial_addresses = set(self.get_interface_addresses(fib, self.pg0))
        self.assertEqual(default_routes, [])
        router_address = IPv6Address(text_type(self.pg0.remote_ip6_ll))

        self.vapi.ip6_nd_address_autoconfig(self.pg0.sw_if_index, 1, 1)

        self.sleep(0.1)

        # send RA
        packet = (self.create_ra_packet(
            self.pg0) / ICMPv6NDOptPrefixInfo(
            prefix="1::",
            prefixlen=64,
            validlifetime=2,
            preferredlifetime=2,
            L=1,
            A=1,
        ) / ICMPv6NDOptPrefixInfo(
            prefix="7::",
            prefixlen=20,
            validlifetime=1500,
            preferredlifetime=1000,
            L=1,
            A=0,
        ))
        self.pg0.add_stream([packet])
        self.pg_start()

        self.sleep_on_vpp_time(0.1)

        fib = self.vapi.ip_route_dump(0, True)

        # check FIB for new address
        addresses = set(self.get_interface_addresses(fib, self.pg0))
        new_addresses = addresses.difference(initial_addresses)
        self.assertEqual(len(new_addresses), 1)
        prefix = IPv6Network(text_type("%s/%d" % (list(new_addresses)[0], 20)),
                             strict=False)
        self.assertEqual(prefix, IPv6Network(text_type('1::/20')))

        # check FIB for new default route
        default_routes = self.get_default_routes(fib)
        self.assertEqual(len(default_routes), 1)
        dr = default_routes[0]
        self.assertEqual(dr['sw_if_index'], self.pg0.sw_if_index)
        self.assertEqual(dr['next_hop'], router_address)

        # send RA to delete default route
        packet = self.create_ra_packet(self.pg0, routerlifetime=0)
        self.pg0.add_stream([packet])
        self.pg_start()

        self.sleep_on_vpp_time(0.1)

        # check that default route is deleted
        fib = self.vapi.ip_route_dump(0, True)
        default_routes = self.get_default_routes(fib)
        self.assertEqual(len(default_routes), 0)

        self.sleep_on_vpp_time(0.1)

        # send RA
        packet = self.create_ra_packet(self.pg0)
        self.pg0.add_stream([packet])
        self.pg_start()

        self.sleep_on_vpp_time(0.1)

        # check FIB for new default route
        fib = self.vapi.ip_route_dump(0, True)
        default_routes = self.get_default_routes(fib)
        self.assertEqual(len(default_routes), 1)
        dr = default_routes[0]
        self.assertEqual(dr['sw_if_index'], self.pg0.sw_if_index)
        self.assertEqual(dr['next_hop'], router_address)

        # send RA, updating router lifetime to 1s
        packet = self.create_ra_packet(self.pg0, 1)
        self.pg0.add_stream([packet])
        self.pg_start()

        self.sleep_on_vpp_time(0.1)

        # check that default route still exists
        fib = self.vapi.ip_route_dump(0, True)
        default_routes = self.get_default_routes(fib)
        self.assertEqual(len(default_routes), 1)
        dr = default_routes[0]
        self.assertEqual(dr['sw_if_index'], self.pg0.sw_if_index)
        self.assertEqual(dr['next_hop'], router_address)

        self.sleep_on_vpp_time(1)

        # check that default route is deleted
        self.assertTrue(self.wait_for_no_default_route())

        # check FIB still contains the SLAAC address
        addresses = set(self.get_interface_addresses(fib, self.pg0))
        new_addresses = addresses.difference(initial_addresses)

        self.assertEqual(len(new_addresses), 1)
        prefix = IPv6Network(text_type("%s/%d" % (list(new_addresses)[0], 20)),
                             strict=False)
        self.assertEqual(prefix, IPv6Network(text_type('1::/20')))

        self.sleep_on_vpp_time(1)

        # check that SLAAC address is deleted
        fib = self.vapi.ip_route_dump(0, True)
        addresses = set(self.get_interface_addresses(fib, self.pg0))
        new_addresses = addresses.difference(initial_addresses)
        self.assertEqual(len(new_addresses), 0)


class IPv6NDProxyTest(TestIPv6ND):
    """ IPv6 ND ProxyTest Case """

    @classmethod
    def setUpClass(cls):
        super(IPv6NDProxyTest, cls).setUpClass()

    @classmethod
    def tearDownClass(cls):
        super(IPv6NDProxyTest, cls).tearDownClass()

    def setUp(self):
        super(IPv6NDProxyTest, self).setUp()

        # create 3 pg interfaces
        self.create_pg_interfaces(range(3))

        # pg0 is the master interface, with the configured subnet
        self.pg0.admin_up()
        self.pg0.config_ip6()
        self.pg0.resolve_ndp()

        self.pg1.ip6_enable()
        self.pg2.ip6_enable()

    def tearDown(self):
        super(IPv6NDProxyTest, self).tearDown()

    def test_nd_proxy(self):
        """ IPv6 Proxy ND """

        #
        # Generate some hosts in the subnet that we are proxying
        #
        self.pg0.generate_remote_hosts(8)

        nsma = in6_getnsma(inet_pton(AF_INET6, self.pg0.local_ip6))
        d = inet_ntop(AF_INET6, nsma)

        #
        # Send an NS for one of those remote hosts on one of the proxy links
        # expect no response since it's from an address that is not
        # on the link that has the prefix configured
        #
        ns_pg1 = (Ether(dst=in6_getnsmac(nsma), src=self.pg1.remote_mac) /
                  IPv6(dst=d,
                       src=self.pg0._remote_hosts[2].ip6) /
                  ICMPv6ND_NS(tgt=self.pg0.local_ip6) /
                  ICMPv6NDOptSrcLLAddr(
                      lladdr=self.pg0._remote_hosts[2].mac))

        self.send_and_assert_no_replies(self.pg1, ns_pg1, "Off link NS")

        #
        # Add proxy support for the host
        #
        self.vapi.ip6nd_proxy_add_del(
            is_add=1, ip=inet_pton(AF_INET6, self.pg0._remote_hosts[2].ip6),
            sw_if_index=self.pg1.sw_if_index)

        #
        # try that NS again. this time we expect an NA back
        #
        self.send_and_expect_na(self.pg1, ns_pg1,
                                "NS to proxy entry",
                                dst_ip=self.pg0._remote_hosts[2].ip6,
                                tgt_ip=self.pg0.local_ip6)

        #
        # ... and that we have an entry in the ND cache
        #
        self.assertTrue(find_nbr(self,
                                 self.pg1.sw_if_index,
                                 self.pg0._remote_hosts[2].ip6))

        #
        # ... and we can route traffic to it
        #
        t = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
             IPv6(dst=self.pg0._remote_hosts[2].ip6,
                  src=self.pg0.remote_ip6) /
             inet6.UDP(sport=10000, dport=20000) /
             Raw(b'\xa5' * 100))

        self.pg0.add_stream(t)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()
        rx = self.pg1.get_capture(1)
        rx = rx[0]

        self.assertEqual(rx[Ether].dst, self.pg0._remote_hosts[2].mac)
        self.assertEqual(rx[Ether].src, self.pg1.local_mac)

        self.assertEqual(rx[IPv6].src,
                         t[IPv6].src)
        self.assertEqual(rx[IPv6].dst,
                         t[IPv6].dst)

        #
        # Test we proxy for the host on the main interface
        #
        ns_pg0 = (Ether(dst=in6_getnsmac(nsma), src=self.pg0.remote_mac) /
                  IPv6(dst=d, src=self.pg0.remote_ip6) /
                  ICMPv6ND_NS(
                      tgt=self.pg0._remote_hosts[2].ip6) /
                  ICMPv6NDOptSrcLLAddr(
                      lladdr=self.pg0.remote_mac))

        self.send_and_expect_na(self.pg0, ns_pg0,
                                "NS to proxy entry on main",
                                tgt_ip=self.pg0._remote_hosts[2].ip6,
                                dst_ip=self.pg0.remote_ip6)

        #
        # Setup and resolve proxy for another host on another interface
        #
        ns_pg2 = (Ether(dst=in6_getnsmac(nsma), src=self.pg2.remote_mac) /
                  IPv6(dst=d,
                       src=self.pg0._remote_hosts[3].ip6) /
                  ICMPv6ND_NS(tgt=self.pg0.local_ip6) /
                  ICMPv6NDOptSrcLLAddr(
                      lladdr=self.pg0._remote_hosts[2].mac))

        self.vapi.ip6nd_proxy_add_del(
            is_add=1, ip=inet_pton(AF_INET6, self.pg0._remote_hosts[3].ip6),
            sw_if_index=self.pg2.sw_if_index)

        self.send_and_expect_na(self.pg2, ns_pg2,
                                "NS to proxy entry other interface",
                                dst_ip=self.pg0._remote_hosts[3].ip6,
                                tgt_ip=self.pg0.local_ip6)

        self.assertTrue(find_nbr(self,
                                 self.pg2.sw_if_index,
                                 self.pg0._remote_hosts[3].ip6))

        #
        # hosts can communicate. pg2->pg1
        #
        t2 = (Ether(dst=self.pg2.local_mac,
                    src=self.pg0.remote_hosts[3].mac) /
              IPv6(dst=self.pg0._remote_hosts[2].ip6,
                   src=self.pg0._remote_hosts[3].ip6) /
              inet6.UDP(sport=10000, dport=20000) /
              Raw(b'\xa5' * 100))

        self.pg2.add_stream(t2)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()
        rx = self.pg1.get_capture(1)
        rx = rx[0]

        self.assertEqual(rx[Ether].dst, self.pg0._remote_hosts[2].mac)
        self.assertEqual(rx[Ether].src, self.pg1.local_mac)

        self.assertEqual(rx[IPv6].src,
                         t2[IPv6].src)
        self.assertEqual(rx[IPv6].dst,
                         t2[IPv6].dst)

        #
        # remove the proxy configs
        #
        self.vapi.ip6nd_proxy_add_del(
            ip=inet_pton(AF_INET6, self.pg0._remote_hosts[2].ip6),
            sw_if_index=self.pg1.sw_if_index, is_add=0)
        self.vapi.ip6nd_proxy_add_del(
            ip=inet_pton(AF_INET6, self.pg0._remote_hosts[3].ip6),
            sw_if_index=self.pg2.sw_if_index, is_add=0)

        self.assertFalse(find_nbr(self,
                                  self.pg2.sw_if_index,
                                  self.pg0._remote_hosts[3].ip6))
        self.assertFalse(find_nbr(self,
                                  self.pg1.sw_if_index,
                                  self.pg0._remote_hosts[2].ip6))

        #
        # no longer proxy-ing...
        #
        self.send_and_assert_no_replies(self.pg0, ns_pg0, "Proxy unconfigured")
        self.send_and_assert_no_replies(self.pg1, ns_pg1, "Proxy unconfigured")
        self.send_and_assert_no_replies(self.pg2, ns_pg2, "Proxy unconfigured")

        #
        # no longer forwarding. traffic generates NS out of the glean/main
        # interface
        #
        self.pg2.add_stream(t2)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg0.get_capture(1)

        self.assertTrue(rx[0].haslayer(ICMPv6ND_NS))


class TestIPNull(VppTestCase):
    """ IPv6 routes via NULL """

    @classmethod
    def setUpClass(cls):
        super(TestIPNull, cls).setUpClass()

    @classmethod
    def tearDownClass(cls):
        super(TestIPNull, cls).tearDownClass()

    def setUp(self):
        super(TestIPNull, self).setUp()

        # create 2 pg interfaces
        self.create_pg_interfaces(range(1))

        for i in self.pg_interfaces:
            i.admin_up()
            i.config_ip6()
            i.resolve_ndp()

    def tearDown(self):
        super(TestIPNull, self).tearDown()
        for i in self.pg_interfaces:
            i.unconfig_ip6()
            i.admin_down()

    def test_ip_null(self):
        """ IP NULL route """

        p = (Ether(src=self.pg0.remote_mac,
                   dst=self.pg0.local_mac) /
             IPv6(src=self.pg0.remote_ip6, dst="2001::1") /
             inet6.UDP(sport=1234, dport=1234) /
             Raw(b'\xa5' * 100))

        #
        # A route via IP NULL that will reply with ICMP unreachables
        #
        ip_unreach = VppIpRoute(
            self, "2001::", 64,
            [VppRoutePath("::", 0xffffffff,
                          type=FibPathType.FIB_PATH_TYPE_ICMP_UNREACH)])
        ip_unreach.add_vpp_config()

        self.pg0.add_stream(p)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg0.get_capture(1)
        rx = rx[0]
        icmp = rx[ICMPv6DestUnreach]

        # 0 = "No route to destination"
        self.assertEqual(icmp.code, 0)

        # ICMP is rate limited. pause a bit
        self.sleep(1)

        #
        # A route via IP NULL that will reply with ICMP prohibited
        #
        ip_prohibit = VppIpRoute(
            self, "2001::1", 128,
            [VppRoutePath("::", 0xffffffff,
                          type=FibPathType.FIB_PATH_TYPE_ICMP_PROHIBIT)])
        ip_prohibit.add_vpp_config()

        self.pg0.add_stream(p)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg0.get_capture(1)
        rx = rx[0]
        icmp = rx[ICMPv6DestUnreach]

        # 1 = "Communication with destination administratively prohibited"
        self.assertEqual(icmp.code, 1)


class TestIPDisabled(VppTestCase):
    """ IPv6 disabled """

    @classmethod
    def setUpClass(cls):
        super(TestIPDisabled, cls).setUpClass()

    @classmethod
    def tearDownClass(cls):
        super(TestIPDisabled, cls).tearDownClass()

    def setUp(self):
        super(TestIPDisabled, self).setUp()

        # create 2 pg interfaces
        self.create_pg_interfaces(range(2))

        # PG0 is IP enabled
        self.pg0.admin_up()
        self.pg0.config_ip6()
        self.pg0.resolve_ndp()

        # PG 1 is not IP enabled
        self.pg1.admin_up()

    def tearDown(self):
        super(TestIPDisabled, self).tearDown()
        for i in self.pg_interfaces:
            i.unconfig_ip4()
            i.admin_down()

    def test_ip_disabled(self):
        """ IP Disabled """

        MRouteItfFlags = VppEnum.vl_api_mfib_itf_flags_t
        MRouteEntryFlags = VppEnum.vl_api_mfib_entry_flags_t
        #
        # An (S,G).
        # one accepting interface, pg0, 2 forwarding interfaces
        #
        route_ff_01 = VppIpMRoute(
            self,
            "::",
            "ffef::1", 128,
            MRouteEntryFlags.MFIB_API_ENTRY_FLAG_NONE,
            [VppMRoutePath(self.pg1.sw_if_index,
                           MRouteItfFlags.MFIB_API_ITF_FLAG_ACCEPT),
             VppMRoutePath(self.pg0.sw_if_index,
                           MRouteItfFlags.MFIB_API_ITF_FLAG_FORWARD)])
        route_ff_01.add_vpp_config()

        pu = (Ether(src=self.pg1.remote_mac,
                    dst=self.pg1.local_mac) /
              IPv6(src="2001::1", dst=self.pg0.remote_ip6) /
              inet6.UDP(sport=1234, dport=1234) /
              Raw(b'\xa5' * 100))
        pm = (Ether(src=self.pg1.remote_mac,
                    dst=self.pg1.local_mac) /
              IPv6(src="2001::1", dst="ffef::1") /
              inet6.UDP(sport=1234, dport=1234) /
              Raw(b'\xa5' * 100))

        #
        # PG1 does not forward IP traffic
        #
        self.send_and_assert_no_replies(self.pg1, pu, "IPv6 disabled")
        self.send_and_assert_no_replies(self.pg1, pm, "IPv6 disabled")

        #
        # IP enable PG1
        #
        self.pg1.config_ip6()

        #
        # Now we get packets through
        #
        self.pg1.add_stream(pu)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()
        rx = self.pg0.get_capture(1)

        self.pg1.add_stream(pm)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()
        rx = self.pg0.get_capture(1)

        #
        # Disable PG1
        #
        self.pg1.unconfig_ip6()

        #
        # PG1 does not forward IP traffic
        #
        self.send_and_assert_no_replies(self.pg1, pu, "IPv6 disabled")
        self.send_and_assert_no_replies(self.pg1, pm, "IPv6 disabled")


class TestIP6LoadBalance(VppTestCase):
    """ IPv6 Load-Balancing """

    @classmethod
    def setUpClass(cls):
        super(TestIP6LoadBalance, cls).setUpClass()

    @classmethod
    def tearDownClass(cls):
        super(TestIP6LoadBalance, cls).tearDownClass()

    def setUp(self):
        super(TestIP6LoadBalance, self).setUp()

        self.create_pg_interfaces(range(5))

        mpls_tbl = VppMplsTable(self, 0)
        mpls_tbl.add_vpp_config()

        for i in self.pg_interfaces:
            i.admin_up()
            i.config_ip6()
            i.resolve_ndp()
            i.enable_mpls()

    def tearDown(self):
        for i in self.pg_interfaces:
            i.unconfig_ip6()
            i.admin_down()
            i.disable_mpls()
        super(TestIP6LoadBalance, self).tearDown()

    def pg_send(self, input, pkts):
        self.vapi.cli("clear trace")
        input.add_stream(pkts)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

    def send_and_expect_load_balancing(self, input, pkts, outputs):
        self.pg_send(input, pkts)
        rxs = []
        for oo in outputs:
            rx = oo._get_capture(1)
            self.assertNotEqual(0, len(rx))
            rxs.append(rx)
        return rxs

    def send_and_expect_one_itf(self, input, pkts, itf):
        self.pg_send(input, pkts)
        rx = itf.get_capture(len(pkts))

    def test_ip6_load_balance(self):
        """ IPv6 Load-Balancing """

        #
        # An array of packets that differ only in the destination port
        #  - IP only
        #  - MPLS EOS
        #  - MPLS non-EOS
        #  - MPLS non-EOS with an entropy label
        #
        port_ip_pkts = []
        port_mpls_pkts = []
        port_mpls_neos_pkts = []
        port_ent_pkts = []

        #
        # An array of packets that differ only in the source address
        #
        src_ip_pkts = []
        src_mpls_pkts = []

        for ii in range(NUM_PKTS):
            port_ip_hdr = (
                IPv6(dst="3000::1", src="3000:1::1") /
                inet6.UDP(sport=1234, dport=1234 + ii) /
                Raw(b'\xa5' * 100))
            port_ip_pkts.append((Ether(src=self.pg0.remote_mac,
                                       dst=self.pg0.local_mac) /
                                 port_ip_hdr))
            port_mpls_pkts.append((Ether(src=self.pg0.remote_mac,
                                         dst=self.pg0.local_mac) /
                                   MPLS(label=66, ttl=2) /
                                   port_ip_hdr))
            port_mpls_neos_pkts.append((Ether(src=self.pg0.remote_mac,
                                              dst=self.pg0.local_mac) /
                                        MPLS(label=67, ttl=2) /
                                        MPLS(label=77, ttl=2) /
                                        port_ip_hdr))
            port_ent_pkts.append((Ether(src=self.pg0.remote_mac,
                                        dst=self.pg0.local_mac) /
                                  MPLS(label=67, ttl=2) /
                                  MPLS(label=14, ttl=2) /
                                  MPLS(label=999, ttl=2) /
                                  port_ip_hdr))
            src_ip_hdr = (
                IPv6(dst="3000::1", src="3000:1::%d" % ii) /
                inet6.UDP(sport=1234, dport=1234) /
                Raw(b'\xa5' * 100))
            src_ip_pkts.append((Ether(src=self.pg0.remote_mac,
                                      dst=self.pg0.local_mac) /
                                src_ip_hdr))
            src_mpls_pkts.append((Ether(src=self.pg0.remote_mac,
                                        dst=self.pg0.local_mac) /
                                  MPLS(label=66, ttl=2) /
                                  src_ip_hdr))

        #
        # A route for the IP packets
        #
        route_3000_1 = VppIpRoute(self, "3000::1", 128,
                                  [VppRoutePath(self.pg1.remote_ip6,
                                                self.pg1.sw_if_index),
                                   VppRoutePath(self.pg2.remote_ip6,
                                                self.pg2.sw_if_index)])
        route_3000_1.add_vpp_config()

        #
        # a local-label for the EOS packets
        #
        binding = VppMplsIpBind(self, 66, "3000::1", 128, is_ip6=1)
        binding.add_vpp_config()

        #
        # An MPLS route for the non-EOS packets
        #
        route_67 = VppMplsRoute(self, 67, 0,
                                [VppRoutePath(self.pg1.remote_ip6,
                                              self.pg1.sw_if_index,
                                              labels=[67]),
                                 VppRoutePath(self.pg2.remote_ip6,
                                              self.pg2.sw_if_index,
                                              labels=[67])])
        route_67.add_vpp_config()

        #
        # inject the packet on pg0 - expect load-balancing across the 2 paths
        #  - since the default hash config is to use IP src,dst and port
        #    src,dst
        # We are not going to ensure equal amounts of packets across each link,
        # since the hash algorithm is statistical and therefore this can never
        # be guaranteed. But with 64 different packets we do expect some
        # balancing. So instead just ensure there is traffic on each link.
        #
        rx = self.send_and_expect_load_balancing(self.pg0, port_ip_pkts,
                                                 [self.pg1, self.pg2])
        n_ip_pg0 = len(rx[0])
        self.send_and_expect_load_balancing(self.pg0, src_ip_pkts,
                                            [self.pg1, self.pg2])
        self.send_and_expect_load_balancing(self.pg0, port_mpls_pkts,
                                            [self.pg1, self.pg2])
        self.send_and_expect_load_balancing(self.pg0, src_mpls_pkts,
                                            [self.pg1, self.pg2])
        rx = self.send_and_expect_load_balancing(self.pg0, port_mpls_neos_pkts,
                                                 [self.pg1, self.pg2])
        n_mpls_pg0 = len(rx[0])

        #
        # change the router ID and expect the distribution changes
        #
        self.vapi.set_ip_flow_hash_router_id(router_id=0x11111111)

        rx = self.send_and_expect_load_balancing(self.pg0, port_ip_pkts,
                                                 [self.pg1, self.pg2])
        self.assertNotEqual(n_ip_pg0, len(rx[0]))

        rx = self.send_and_expect_load_balancing(self.pg0, src_mpls_pkts,
                                                 [self.pg1, self.pg2])
        self.assertNotEqual(n_mpls_pg0, len(rx[0]))

        #
        # The packets with Entropy label in should not load-balance,
        # since the Entropy value is fixed.
        #
        self.send_and_expect_one_itf(self.pg0, port_ent_pkts, self.pg1)

        #
        # change the flow hash config so it's only IP src,dst
        #  - now only the stream with differing source address will
        #    load-balance
        #
        self.vapi.set_ip_flow_hash(vrf_id=0, src=1, dst=1, proto=1,
                                   sport=0, dport=0, is_ipv6=1)

        self.send_and_expect_load_balancing(self.pg0, src_ip_pkts,
                                            [self.pg1, self.pg2])
        self.send_and_expect_load_balancing(self.pg0, src_mpls_pkts,
                                            [self.pg1, self.pg2])
        self.send_and_expect_one_itf(self.pg0, port_ip_pkts, self.pg2)

        #
        # change the flow hash config back to defaults
        #
        self.vapi.set_ip_flow_hash(vrf_id=0, src=1, dst=1, sport=1, dport=1,
                                   proto=1, is_ipv6=1)

        #
        # Recursive prefixes
        #  - testing that 2 stages of load-balancing occurs and there is no
        #    polarisation (i.e. only 2 of 4 paths are used)
        #
        port_pkts = []
        src_pkts = []

        for ii in range(257):
            port_pkts.append((Ether(src=self.pg0.remote_mac,
                                    dst=self.pg0.local_mac) /
                              IPv6(dst="4000::1",
                                   src="4000:1::1") /
                              inet6.UDP(sport=1234,
                                        dport=1234 + ii) /
                              Raw(b'\xa5' * 100)))
            src_pkts.append((Ether(src=self.pg0.remote_mac,
                                   dst=self.pg0.local_mac) /
                             IPv6(dst="4000::1",
                                  src="4000:1::%d" % ii) /
                             inet6.UDP(sport=1234, dport=1234) /
                             Raw(b'\xa5' * 100)))

        route_3000_2 = VppIpRoute(self, "3000::2", 128,
                                  [VppRoutePath(self.pg3.remote_ip6,
                                                self.pg3.sw_if_index),
                                   VppRoutePath(self.pg4.remote_ip6,
                                                self.pg4.sw_if_index)])
        route_3000_2.add_vpp_config()

        route_4000_1 = VppIpRoute(self, "4000::1", 128,
                                  [VppRoutePath("3000::1",
                                                0xffffffff),
                                   VppRoutePath("3000::2",
                                                0xffffffff)])
        route_4000_1.add_vpp_config()

        #
        # inject the packet on pg0 - expect load-balancing across all 4 paths
        #
        self.vapi.cli("clear trace")
        self.send_and_expect_load_balancing(self.pg0, port_pkts,
                                            [self.pg1, self.pg2,
                                             self.pg3, self.pg4])
        self.send_and_expect_load_balancing(self.pg0, src_pkts,
                                            [self.pg1, self.pg2,
                                             self.pg3, self.pg4])

        #
        # Recursive prefixes
        #  - testing that 2 stages of load-balancing no choices
        #
        port_pkts = []

        for ii in range(257):
            port_pkts.append((Ether(src=self.pg0.remote_mac,
                                    dst=self.pg0.local_mac) /
                              IPv6(dst="6000::1",
                                   src="6000:1::1") /
                              inet6.UDP(sport=1234,
                                        dport=1234 + ii) /
                              Raw(b'\xa5' * 100)))

        route_5000_2 = VppIpRoute(self, "5000::2", 128,
                                  [VppRoutePath(self.pg3.remote_ip6,
                                                self.pg3.sw_if_index)])
        route_5000_2.add_vpp_config()

        route_6000_1 = VppIpRoute(self, "6000::1", 128,
                                  [VppRoutePath("5000::2",
                                                0xffffffff)])
        route_6000_1.add_vpp_config()

        #
        # inject the packet on pg0 - expect load-balancing across all 4 paths
        #
        self.vapi.cli("clear trace")
        self.send_and_expect_one_itf(self.pg0, port_pkts, self.pg3)


class IP6PuntSetup(object):
    """ Setup for IPv6 Punt Police/Redirect """

    def punt_setup(self):
        self.create_pg_interfaces(range(4))

        for i in self.pg_interfaces:
            i.admin_up()
            i.config_ip6()
            i.resolve_ndp()

        self.pkt = (Ether(src=self.pg0.remote_mac,
                          dst=self.pg0.local_mac) /
                    IPv6(src=self.pg0.remote_ip6,
                         dst=self.pg0.local_ip6) /
                    inet6.TCP(sport=1234, dport=1234) /
                    Raw(b'\xa5' * 100))

    def punt_teardown(self):
        for i in self.pg_interfaces:
            i.unconfig_ip6()
            i.admin_down()


class TestIP6Punt(IP6PuntSetup, VppTestCase):
    """ IPv6 Punt Police/Redirect """

    def setUp(self):
        super(TestIP6Punt, self).setUp()
        super(TestIP6Punt, self).punt_setup()

    def tearDown(self):
        super(TestIP6Punt, self).punt_teardown()
        super(TestIP6Punt, self).tearDown()

    def test_ip_punt(self):
        """ IP6 punt police and redirect """

        pkts = self.pkt * 1025

        #
        # Configure a punt redirect via pg1.
        #
        nh_addr = self.pg1.remote_ip6
        ip_punt_redirect = VppIpPuntRedirect(self, self.pg0.sw_if_index,
                                             self.pg1.sw_if_index, nh_addr)
        ip_punt_redirect.add_vpp_config()

        self.send_and_expect(self.pg0, pkts, self.pg1)

        #
        # add a policer
        #
        policer = VppPolicer(self, "ip6-punt", 400, 0, 10, 0, rate_type=1)
        policer.add_vpp_config()
        ip_punt_policer = VppIpPuntPolicer(self, policer.policer_index,
                                           is_ip6=True)
        ip_punt_policer.add_vpp_config()

        self.vapi.cli("clear trace")
        self.pg0.add_stream(pkts)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        #
        # the number of packet received should be greater than 0,
        # but not equal to the number sent, since some were policed
        #
        rx = self.pg1._get_capture(1)
        stats = policer.get_stats()

        # Single rate policer - expect conform, violate but no exceed
        self.assertGreater(stats['conform_packets'], 0)
        self.assertEqual(stats['exceed_packets'], 0)
        self.assertGreater(stats['violate_packets'], 0)

        self.assertGreater(len(rx), 0)
        self.assertLess(len(rx), len(pkts))

        #
        # remove the policer. back to full rx
        #
        ip_punt_policer.remove_vpp_config()
        policer.remove_vpp_config()
        self.send_and_expect(self.pg0, pkts, self.pg1)

        #
        # remove the redirect. expect full drop.
        #
        ip_punt_redirect.remove_vpp_config()
        self.send_and_assert_no_replies(self.pg0, pkts,
                                        "IP no punt config")

        #
        # Add a redirect that is not input port selective
        #
        ip_punt_redirect = VppIpPuntRedirect(self, 0xffffffff,
                                             self.pg1.sw_if_index, nh_addr)
        ip_punt_redirect.add_vpp_config()
        self.send_and_expect(self.pg0, pkts, self.pg1)
        ip_punt_redirect.remove_vpp_config()

    def test_ip_punt_dump(self):
        """ IP6 punt redirect dump"""

        #
        # Configure a punt redirects
        #
        nh_address = self.pg3.remote_ip6
        ipr_03 = VppIpPuntRedirect(self, self.pg0.sw_if_index,
                                   self.pg3.sw_if_index, nh_address)
        ipr_13 = VppIpPuntRedirect(self, self.pg1.sw_if_index,
                                   self.pg3.sw_if_index, nh_address)
        ipr_23 = VppIpPuntRedirect(self, self.pg2.sw_if_index,
                                   self.pg3.sw_if_index, '0::0')
        ipr_03.add_vpp_config()
        ipr_13.add_vpp_config()
        ipr_23.add_vpp_config()

        #
        # Dump pg0 punt redirects
        #
        self.assertTrue(ipr_03.query_vpp_config())
        self.assertTrue(ipr_13.query_vpp_config())
        self.assertTrue(ipr_23.query_vpp_config())

        #
        # Dump punt redirects for all interfaces
        #
        punts = self.vapi.ip_punt_redirect_dump(0xffffffff, is_ipv6=1)
        self.assertEqual(len(punts), 3)
        for p in punts:
            self.assertEqual(p.punt.tx_sw_if_index, self.pg3.sw_if_index)
        self.assertNotEqual(punts[1].punt.nh, self.pg3.remote_ip6)
        self.assertEqual(str(punts[2].punt.nh), '::')


class TestIP6PuntHandoff(IP6PuntSetup, VppTestCase):
    """ IPv6 Punt Police/Redirect """
    worker_config = "workers 2"

    def setUp(self):
        super(TestIP6PuntHandoff, self).setUp()
        super(TestIP6PuntHandoff, self).punt_setup()

    def tearDown(self):
        super(TestIP6PuntHandoff, self).punt_teardown()
        super(TestIP6PuntHandoff, self).tearDown()

    def test_ip_punt(self):
        """ IP6 punt policer thread handoff """
        pkts = self.pkt * NUM_PKTS

        #
        # Configure a punt redirect via pg1.
        #
        nh_addr = self.pg1.remote_ip6
        ip_punt_redirect = VppIpPuntRedirect(self, self.pg0.sw_if_index,
                                             self.pg1.sw_if_index, nh_addr)
        ip_punt_redirect.add_vpp_config()

        action_tx = PolicerAction(
            VppEnum.vl_api_sse2_qos_action_type_t.SSE2_QOS_ACTION_API_TRANSMIT,
            0)
        #
        # This policer drops no packets, we are just
        # testing that they get to the right thread.
        #
        policer = VppPolicer(self, "ip6-punt", 400, 0, 10, 0, 1,
                             0, 0, False, action_tx, action_tx, action_tx)
        policer.add_vpp_config()
        ip_punt_policer = VppIpPuntPolicer(self, policer.policer_index,
                                           is_ip6=True)
        ip_punt_policer.add_vpp_config()

        for worker in [0, 1]:
            self.send_and_expect(self.pg0, pkts, self.pg1, worker=worker)
            if worker == 0:
                self.logger.debug(self.vapi.cli("show trace max 100"))

        # Combined stats, all threads
        stats = policer.get_stats()

        # Single rate policer - expect conform, violate but no exceed
        self.assertGreater(stats['conform_packets'], 0)
        self.assertEqual(stats['exceed_packets'], 0)
        self.assertGreater(stats['violate_packets'], 0)

        # Worker 0, should have done all the policing
        stats0 = policer.get_stats(worker=0)
        self.assertEqual(stats, stats0)

        # Worker 1, should have handed everything off
        stats1 = policer.get_stats(worker=1)
        self.assertEqual(stats1['conform_packets'], 0)
        self.assertEqual(stats1['exceed_packets'], 0)
        self.assertEqual(stats1['violate_packets'], 0)

        # Bind the policer to worker 1 and repeat
        policer.bind_vpp_config(1, True)
        for worker in [0, 1]:
            self.send_and_expect(self.pg0, pkts, self.pg1, worker=worker)
            self.logger.debug(self.vapi.cli("show trace max 100"))

        # The 2 workers should now have policed the same amount
        stats = policer.get_stats()
        stats0 = policer.get_stats(worker=0)
        stats1 = policer.get_stats(worker=1)

        self.assertGreater(stats0['conform_packets'], 0)
        self.assertEqual(stats0['exceed_packets'], 0)
        self.assertGreater(stats0['violate_packets'], 0)

        self.assertGreater(stats1['conform_packets'], 0)
        self.assertEqual(stats1['exceed_packets'], 0)
        self.assertGreater(stats1['violate_packets'], 0)

        self.assertEqual(stats0['conform_packets'] + stats1['conform_packets'],
                         stats['conform_packets'])

        self.assertEqual(stats0['violate_packets'] + stats1['violate_packets'],
                         stats['violate_packets'])

        # Unbind the policer and repeat
        policer.bind_vpp_config(1, False)
        for worker in [0, 1]:
            self.send_and_expect(self.pg0, pkts, self.pg1, worker=worker)
            self.logger.debug(self.vapi.cli("show trace max 100"))

        # The policer should auto-bind to worker 0 when packets arrive
        stats = policer.get_stats()
        stats0new = policer.get_stats(worker=0)
        stats1new = policer.get_stats(worker=1)

        self.assertGreater(stats0new['conform_packets'],
                           stats0['conform_packets'])
        self.assertEqual(stats0new['exceed_packets'], 0)
        self.assertGreater(stats0new['violate_packets'],
                           stats0['violate_packets'])

        self.assertEqual(stats1, stats1new)

        #
        # Clean up
        #
        ip_punt_policer.remove_vpp_config()
        policer.remove_vpp_config()
        ip_punt_redirect.remove_vpp_config()


class TestIPDeag(VppTestCase):
    """ IPv6 Deaggregate Routes """

    @classmethod
    def setUpClass(cls):
        super(TestIPDeag, cls).setUpClass()

    @classmethod
    def tearDownClass(cls):
        super(TestIPDeag, cls).tearDownClass()

    def setUp(self):
        super(TestIPDeag, self).setUp()

        self.create_pg_interfaces(range(3))

        for i in self.pg_interfaces:
            i.admin_up()
            i.config_ip6()
            i.resolve_ndp()

    def tearDown(self):
        super(TestIPDeag, self).tearDown()
        for i in self.pg_interfaces:
            i.unconfig_ip6()
            i.admin_down()

    def test_ip_deag(self):
        """ IP Deag Routes """

        #
        # Create a table to be used for:
        #  1 - another destination address lookup
        #  2 - a source address lookup
        #
        table_dst = VppIpTable(self, 1, is_ip6=1)
        table_src = VppIpTable(self, 2, is_ip6=1)
        table_dst.add_vpp_config()
        table_src.add_vpp_config()

        #
        # Add a route in the default table to point to a deag/
        # second lookup in each of these tables
        #
        route_to_dst = VppIpRoute(self, "1::1", 128,
                                  [VppRoutePath("::",
                                                0xffffffff,
                                                nh_table_id=1)])
        route_to_src = VppIpRoute(
            self, "1::2", 128,
            [VppRoutePath("::",
                          0xffffffff,
                          nh_table_id=2,
                          type=FibPathType.FIB_PATH_TYPE_SOURCE_LOOKUP)])

        route_to_dst.add_vpp_config()
        route_to_src.add_vpp_config()

        #
        # packets to these destination are dropped, since they'll
        # hit the respective default routes in the second table
        #
        p_dst = (Ether(src=self.pg0.remote_mac,
                       dst=self.pg0.local_mac) /
                 IPv6(src="5::5", dst="1::1") /
                 inet6.TCP(sport=1234, dport=1234) /
                 Raw(b'\xa5' * 100))
        p_src = (Ether(src=self.pg0.remote_mac,
                       dst=self.pg0.local_mac) /
                 IPv6(src="2::2", dst="1::2") /
                 inet6.TCP(sport=1234, dport=1234) /
                 Raw(b'\xa5' * 100))
        pkts_dst = p_dst * 257
        pkts_src = p_src * 257

        self.send_and_assert_no_replies(self.pg0, pkts_dst,
                                        "IP in dst table")
        self.send_and_assert_no_replies(self.pg0, pkts_src,
                                        "IP in src table")

        #
        # add a route in the dst table to forward via pg1
        #
        route_in_dst = VppIpRoute(self, "1::1", 128,
                                  [VppRoutePath(self.pg1.remote_ip6,
                                                self.pg1.sw_if_index)],
                                  table_id=1)
        route_in_dst.add_vpp_config()

        self.send_and_expect(self.pg0, pkts_dst, self.pg1)

        #
        # add a route in the src table to forward via pg2
        #
        route_in_src = VppIpRoute(self, "2::2", 128,
                                  [VppRoutePath(self.pg2.remote_ip6,
                                                self.pg2.sw_if_index)],
                                  table_id=2)
        route_in_src.add_vpp_config()
        self.send_and_expect(self.pg0, pkts_src, self.pg2)

        #
        # loop in the lookup DP
        #
        route_loop = VppIpRoute(self, "3::3", 128,
                                [VppRoutePath("::",
                                              0xffffffff)])
        route_loop.add_vpp_config()

        p_l = (Ether(src=self.pg0.remote_mac,
                     dst=self.pg0.local_mac) /
               IPv6(src="3::4", dst="3::3") /
               inet6.TCP(sport=1234, dport=1234) /
               Raw(b'\xa5' * 100))

        self.send_and_assert_no_replies(self.pg0, p_l * 257,
                                        "IP lookup loop")


class TestIP6Input(VppTestCase):
    """ IPv6 Input Exception Test Cases """

    @classmethod
    def setUpClass(cls):
        super(TestIP6Input, cls).setUpClass()

    @classmethod
    def tearDownClass(cls):
        super(TestIP6Input, cls).tearDownClass()

    def setUp(self):
        super(TestIP6Input, self).setUp()

        self.create_pg_interfaces(range(2))

        for i in self.pg_interfaces:
            i.admin_up()
            i.config_ip6()
            i.resolve_ndp()

    def tearDown(self):
        super(TestIP6Input, self).tearDown()
        for i in self.pg_interfaces:
            i.unconfig_ip6()
            i.admin_down()

    def test_ip_input_icmp_reply(self):
        """ IP6 Input Exception - Return ICMP (3,0) """
        #
        # hop limit - ICMP replies
        #
        p_version = (Ether(src=self.pg0.remote_mac,
                           dst=self.pg0.local_mac) /
                     IPv6(src=self.pg0.remote_ip6,
                          dst=self.pg1.remote_ip6,
                          hlim=1) /
                     inet6.UDP(sport=1234, dport=1234) /
                     Raw(b'\xa5' * 100))

        rx = self.send_and_expect(self.pg0, p_version * NUM_PKTS, self.pg0)
        rx = rx[0]
        icmp = rx[ICMPv6TimeExceeded]

        # 0: "hop limit exceeded in transit",
        self.assertEqual((icmp.type, icmp.code), (3, 0))

    icmpv6_data = '\x0a' * 18
    all_0s = "::"
    all_1s = "FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF"

    @parameterized.expand([
        # Name, src, dst, l4proto, msg, timeout
        ("src='iface',   dst='iface'", None, None,
         inet6.UDP(sport=1234, dport=1234), "funky version", None),
        ("src='All 0's', dst='iface'", all_0s, None,
         ICMPv6EchoRequest(id=0xb, seq=5, data=icmpv6_data), None, 0.1),
        ("src='iface',   dst='All 0's'", None, all_0s,
         ICMPv6EchoRequest(id=0xb, seq=5, data=icmpv6_data), None, 0.1),
        ("src='All 1's', dst='iface'", all_1s, None,
         ICMPv6EchoRequest(id=0xb, seq=5, data=icmpv6_data), None, 0.1),
        ("src='iface',   dst='All 1's'", None, all_1s,
         ICMPv6EchoRequest(id=0xb, seq=5, data=icmpv6_data), None, 0.1),
        ("src='All 1's', dst='All 1's'", all_1s, all_1s,
         ICMPv6EchoRequest(id=0xb, seq=5, data=icmpv6_data), None, 0.1),

    ])
    def test_ip_input_no_replies(self, name, src, dst, l4, msg, timeout):

        self._testMethodDoc = 'IPv6 Input Exception - %s' % name

        p_version = (Ether(src=self.pg0.remote_mac,
                           dst=self.pg0.local_mac) /
                     IPv6(src=src or self.pg0.remote_ip6,
                          dst=dst or self.pg1.remote_ip6,
                          version=3) /
                     l4 /
                     Raw(b'\xa5' * 100))

        self.send_and_assert_no_replies(self.pg0, p_version * NUM_PKTS,
                                        remark=msg or "",
                                        timeout=timeout)

    def test_hop_by_hop(self):
        """ Hop-by-hop header test """

        p = (Ether(src=self.pg0.remote_mac,
                   dst=self.pg0.local_mac) /
             IPv6(src=self.pg0.remote_ip6, dst=self.pg0.local_ip6) /
             IPv6ExtHdrHopByHop() /
             inet6.UDP(sport=1234, dport=1234) /
             Raw(b'\xa5' * 100))

        self.pg0.add_stream(p)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()


class TestIPReplace(VppTestCase):
    """ IPv6 Table Replace """

    @classmethod
    def setUpClass(cls):
        super(TestIPReplace, cls).setUpClass()

    @classmethod
    def tearDownClass(cls):
        super(TestIPReplace, cls).tearDownClass()

    def setUp(self):
        super(TestIPReplace, self).setUp()

        self.create_pg_interfaces(range(4))

        table_id = 1
        self.tables = []

        for i in self.pg_interfaces:
            i.admin_up()
            i.config_ip6()
            i.generate_remote_hosts(2)
            self.tables.append(VppIpTable(self, table_id,
                                          True).add_vpp_config())
            table_id += 1

    def tearDown(self):
        super(TestIPReplace, self).tearDown()
        for i in self.pg_interfaces:
            i.admin_down()
            i.unconfig_ip6()

    def test_replace(self):
        """ IP Table Replace """

        MRouteItfFlags = VppEnum.vl_api_mfib_itf_flags_t
        MRouteEntryFlags = VppEnum.vl_api_mfib_entry_flags_t
        N_ROUTES = 20
        links = [self.pg0, self.pg1, self.pg2, self.pg3]
        routes = [[], [], [], []]

        # the sizes of 'empty' tables
        for t in self.tables:
            self.assertEqual(len(t.dump()), 2)
            self.assertEqual(len(t.mdump()), 5)

        # load up the tables with some routes
        for ii, t in enumerate(self.tables):
            for jj in range(1, N_ROUTES):
                uni = VppIpRoute(
                    self, "2001::%d" % jj if jj != 0 else "2001::", 128,
                    [VppRoutePath(links[ii].remote_hosts[0].ip6,
                                  links[ii].sw_if_index),
                     VppRoutePath(links[ii].remote_hosts[1].ip6,
                                  links[ii].sw_if_index)],
                    table_id=t.table_id).add_vpp_config()
                multi = VppIpMRoute(
                    self, "::",
                    "ff:2001::%d" % jj, 128,
                    MRouteEntryFlags.MFIB_API_ENTRY_FLAG_NONE,
                    [VppMRoutePath(self.pg0.sw_if_index,
                                   MRouteItfFlags.MFIB_API_ITF_FLAG_ACCEPT,
                                   proto=FibPathProto.FIB_PATH_NH_PROTO_IP6),
                     VppMRoutePath(self.pg1.sw_if_index,
                                   MRouteItfFlags.MFIB_API_ITF_FLAG_FORWARD,
                                   proto=FibPathProto.FIB_PATH_NH_PROTO_IP6),
                     VppMRoutePath(self.pg2.sw_if_index,
                                   MRouteItfFlags.MFIB_API_ITF_FLAG_FORWARD,
                                   proto=FibPathProto.FIB_PATH_NH_PROTO_IP6),
                     VppMRoutePath(self.pg3.sw_if_index,
                                   MRouteItfFlags.MFIB_API_ITF_FLAG_FORWARD,
                                   proto=FibPathProto.FIB_PATH_NH_PROTO_IP6)],
                    table_id=t.table_id).add_vpp_config()
                routes[ii].append({'uni': uni,
                                   'multi': multi})

        #
        # replace the tables a few times
        #
        for kk in range(3):
            # replace each table
            for t in self.tables:
                t.replace_begin()

            # all the routes are still there
            for ii, t in enumerate(self.tables):
                dump = t.dump()
                mdump = t.mdump()
                for r in routes[ii]:
                    self.assertTrue(find_route_in_dump(dump, r['uni'], t))
                    self.assertTrue(find_mroute_in_dump(mdump, r['multi'], t))

            # redownload the even numbered routes
            for ii, t in enumerate(self.tables):
                for jj in range(0, N_ROUTES, 2):
                    routes[ii][jj]['uni'].add_vpp_config()
                    routes[ii][jj]['multi'].add_vpp_config()

            # signal each table converged
            for t in self.tables:
                t.replace_end()

            # we should find the even routes, but not the odd
            for ii, t in enumerate(self.tables):
                dump = t.dump()
                mdump = t.mdump()
                for jj in range(0, N_ROUTES, 2):
                    self.assertTrue(find_route_in_dump(
                        dump, routes[ii][jj]['uni'], t))
                    self.assertTrue(find_mroute_in_dump(
                        mdump, routes[ii][jj]['multi'], t))
                for jj in range(1, N_ROUTES - 1, 2):
                    self.assertFalse(find_route_in_dump(
                        dump, routes[ii][jj]['uni'], t))
                    self.assertFalse(find_mroute_in_dump(
                        mdump, routes[ii][jj]['multi'], t))

            # reload all the routes
            for ii, t in enumerate(self.tables):
                for r in routes[ii]:
                    r['uni'].add_vpp_config()
                    r['multi'].add_vpp_config()

            # all the routes are still there
            for ii, t in enumerate(self.tables):
                dump = t.dump()
                mdump = t.mdump()
                for r in routes[ii]:
                    self.assertTrue(find_route_in_dump(dump, r['uni'], t))
                    self.assertTrue(find_mroute_in_dump(mdump, r['multi'], t))

        #
        # finally flush the tables for good measure
        #
        for t in self.tables:
            t.flush()
            self.assertEqual(len(t.dump()), 2)
            self.assertEqual(len(t.mdump()), 5)


class TestIP6Replace(VppTestCase):
    """ IPv4 Interface Address Replace """

    @classmethod
    def setUpClass(cls):
        super(TestIP6Replace, cls).setUpClass()

    @classmethod
    def tearDownClass(cls):
        super(TestIP6Replace, cls).tearDownClass()

    def setUp(self):
        super(TestIP6Replace, self).setUp()

        self.create_pg_interfaces(range(4))

        for i in self.pg_interfaces:
            i.admin_up()

    def tearDown(self):
        super(TestIP6Replace, self).tearDown()
        for i in self.pg_interfaces:
            i.admin_down()

    def get_n_pfxs(self, intf):
        return len(self.vapi.ip_address_dump(intf.sw_if_index, True))

    def test_replace(self):
        """ IP interface address replace """

        intf_pfxs = [[], [], [], []]

        # add prefixes to each of the interfaces
        for i in range(len(self.pg_interfaces)):
            intf = self.pg_interfaces[i]

            # 2001:16:x::1/64
            addr = "2001:16:%d::1" % intf.sw_if_index
            a = VppIpInterfaceAddress(self, intf, addr, 64).add_vpp_config()
            intf_pfxs[i].append(a)

            # 2001:16:x::2/64 - a different address in the same subnet as above
            addr = "2001:16:%d::2" % intf.sw_if_index
            a = VppIpInterfaceAddress(self, intf, addr, 64).add_vpp_config()
            intf_pfxs[i].append(a)

            # 2001:15:x::2/64 - a different address and subnet
            addr = "2001:15:%d::2" % intf.sw_if_index
            a = VppIpInterfaceAddress(self, intf, addr, 64).add_vpp_config()
            intf_pfxs[i].append(a)

        # a dump should n_address in it
        for intf in self.pg_interfaces:
            self.assertEqual(self.get_n_pfxs(intf), 3)

        #
        # remove all the address thru a replace
        #
        self.vapi.sw_interface_address_replace_begin()
        self.vapi.sw_interface_address_replace_end()
        for intf in self.pg_interfaces:
            self.assertEqual(self.get_n_pfxs(intf), 0)

        #
        # add all the interface addresses back
        #
        for p in intf_pfxs:
            for v in p:
                v.add_vpp_config()
        for intf in self.pg_interfaces:
            self.assertEqual(self.get_n_pfxs(intf), 3)

        #
        # replace again, but this time update/re-add the address on the first
        # two interfaces
        #
        self.vapi.sw_interface_address_replace_begin()

        for p in intf_pfxs[:2]:
            for v in p:
                v.add_vpp_config()

        self.vapi.sw_interface_address_replace_end()

        # on the first two the address still exist,
        # on the other two they do not
        for intf in self.pg_interfaces[:2]:
            self.assertEqual(self.get_n_pfxs(intf), 3)
        for p in intf_pfxs[:2]:
            for v in p:
                self.assertTrue(v.query_vpp_config())
        for intf in self.pg_interfaces[2:]:
            self.assertEqual(self.get_n_pfxs(intf), 0)

        #
        # add all the interface addresses back on the last two
        #
        for p in intf_pfxs[2:]:
            for v in p:
                v.add_vpp_config()
        for intf in self.pg_interfaces:
            self.assertEqual(self.get_n_pfxs(intf), 3)

        #
        # replace again, this time add different prefixes on all the interfaces
        #
        self.vapi.sw_interface_address_replace_begin()

        pfxs = []
        for intf in self.pg_interfaces:
            # 2001:18:x::1/64
            addr = "2001:18:%d::1" % intf.sw_if_index
            pfxs.append(VppIpInterfaceAddress(self, intf, addr,
                                              64).add_vpp_config())

        self.vapi.sw_interface_address_replace_end()

        # only .18 should exist on each interface
        for intf in self.pg_interfaces:
            self.assertEqual(self.get_n_pfxs(intf), 1)
        for pfx in pfxs:
            self.assertTrue(pfx.query_vpp_config())

        #
        # remove everything
        #
        self.vapi.sw_interface_address_replace_begin()
        self.vapi.sw_interface_address_replace_end()
        for intf in self.pg_interfaces:
            self.assertEqual(self.get_n_pfxs(intf), 0)

        #
        # add prefixes to each interface. post-begin add the prefix from
        # interface X onto interface Y. this would normally be an error
        # since it would generate a 'duplicate address' warning. but in
        # this case, since what is newly downloaded is sane, it's ok
        #
        for intf in self.pg_interfaces:
            # 2001:18:x::1/64
            addr = "2001:18:%d::1" % intf.sw_if_index
            VppIpInterfaceAddress(self, intf, addr, 64).add_vpp_config()

        self.vapi.sw_interface_address_replace_begin()

        pfxs = []
        for intf in self.pg_interfaces:
            # 2001:18:x::1/64
            addr = "2001:18:%d::1" % (intf.sw_if_index + 1)
            pfxs.append(VppIpInterfaceAddress(self, intf,
                                              addr, 64).add_vpp_config())

        self.vapi.sw_interface_address_replace_end()

        self.logger.info(self.vapi.cli("sh int addr"))

        for intf in self.pg_interfaces:
            self.assertEqual(self.get_n_pfxs(intf), 1)
        for pfx in pfxs:
            self.assertTrue(pfx.query_vpp_config())


class TestIP6LinkLocal(VppTestCase):
    """ IPv6 Link Local """

    @classmethod
    def setUpClass(cls):
        super(TestIP6LinkLocal, cls).setUpClass()

    @classmethod
    def tearDownClass(cls):
        super(TestIP6LinkLocal, cls).tearDownClass()

    def setUp(self):
        super(TestIP6LinkLocal, self).setUp()

        self.create_pg_interfaces(range(2))

        for i in self.pg_interfaces:
            i.admin_up()

    def tearDown(self):
        super(TestIP6LinkLocal, self).tearDown()
        for i in self.pg_interfaces:
            i.admin_down()

    def test_ip6_ll(self):
        """ IPv6 Link Local """

        #
        # two APIs to add a link local address.
        #   1 - just like any other prefix
        #   2 - with the special set LL API
        #

        #
        # First with the API to set a 'normal' prefix
        #
        ll1 = "fe80:1::1"
        ll2 = "fe80:2::2"
        ll3 = "fe80:3::3"

        VppIpInterfaceAddress(self, self.pg0, ll1, 128).add_vpp_config()

        #
        # should be able to ping the ll
        #
        p_echo_request_1 = (Ether(src=self.pg0.remote_mac,
                                  dst=self.pg0.local_mac) /
                            IPv6(src=ll2,
                                 dst=ll1) /
                            ICMPv6EchoRequest())

        self.send_and_expect(self.pg0, [p_echo_request_1], self.pg0)

        #
        # change the link-local on pg0
        #
        v_ll3 = VppIpInterfaceAddress(self, self.pg0,
                                      ll3, 128).add_vpp_config()

        p_echo_request_3 = (Ether(src=self.pg0.remote_mac,
                                  dst=self.pg0.local_mac) /
                            IPv6(src=ll2,
                                 dst=ll3) /
                            ICMPv6EchoRequest())

        self.send_and_expect(self.pg0, [p_echo_request_3], self.pg0)

        #
        # set a normal v6 prefix on the link
        #
        self.pg0.config_ip6()

        self.send_and_expect(self.pg0, [p_echo_request_3], self.pg0)

        # the link-local cannot be removed
        with self.vapi.assert_negative_api_retval():
            v_ll3.remove_vpp_config()

        #
        # Use the specific link-local API on pg1
        #
        VppIp6LinkLocalAddress(self, self.pg1, ll1).add_vpp_config()
        self.send_and_expect(self.pg1, [p_echo_request_1], self.pg1)

        VppIp6LinkLocalAddress(self, self.pg1, ll3).add_vpp_config()
        self.send_and_expect(self.pg1, [p_echo_request_3], self.pg1)


if __name__ == '__main__':
    unittest.main(testRunner=VppTestRunner)