summaryrefslogtreecommitdiffstats
path: root/ripngd/ripngd.c
blob: 120f46f0da70a915409f7df8248bbd08f67f2967 (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
/* RIPng daemon
 * Copyright (C) 1998, 1999 Kunihiro Ishiguro
 *
 * This file is part of GNU Zebra.
 *
 * GNU Zebra is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * GNU Zebra is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; see the file COPYING; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <zebra.h>

#include "prefix.h"
#include "filter.h"
#include "log.h"
#include "thread.h"
#include "memory.h"
#include "if.h"
#include "stream.h"
#include "agg_table.h"
#include "command.h"
#include "sockopt.h"
#include "distribute.h"
#include "plist.h"
#include "routemap.h"
#include "if_rmap.h"
#include "privs.h"
#include "lib_errors.h"
#include "northbound_cli.h"

#include "ripngd/ripngd.h"
#include "ripngd/ripng_route.h"
#include "ripngd/ripng_debug.h"
#include "ripngd/ripng_nexthop.h"

DEFINE_MGROUP(RIPNGD, "ripngd")
DEFINE_MTYPE_STATIC(RIPNGD, RIPNG, "RIPng structure")
DEFINE_MTYPE_STATIC(RIPNGD, RIPNG_VRF_NAME, "RIPng VRF name")
DEFINE_MTYPE_STATIC(RIPNGD, RIPNG_ROUTE, "RIPng route info")

enum { ripng_all_route,
       ripng_changed_route,
};

static void ripng_distribute_update(struct distribute_ctx *ctx,
				    struct distribute *dist);

/* Prototypes. */
void ripng_output_process(struct interface *, struct sockaddr_in6 *, int);
static void ripng_instance_enable(struct ripng *ripng, struct vrf *vrf,
				  int sock);
static void ripng_instance_disable(struct ripng *ripng);
int ripng_triggered_update(struct thread *);
static void ripng_if_rmap_update(struct if_rmap_ctx *ctx,
				 struct if_rmap *if_rmap);

/* Generate rb-tree of RIPng instances. */
static inline int ripng_instance_compare(const struct ripng *a,
					 const struct ripng *b)
{
	return strcmp(a->vrf_name, b->vrf_name);
}
RB_GENERATE(ripng_instance_head, ripng, entry, ripng_instance_compare)

struct ripng_instance_head ripng_instances = RB_INITIALIZER(&ripng_instances);

/* RIPng next hop specification. */
struct ripng_nexthop {
	enum ripng_nexthop_type {
		RIPNG_NEXTHOP_UNSPEC,
		RIPNG_NEXTHOP_ADDRESS
	} flag;
	struct in6_addr address;
};

int ripng_route_rte(struct ripng_info *rinfo)
{
	return (rinfo->type == ZEBRA_ROUTE_RIPNG
		&& rinfo->sub_type == RIPNG_ROUTE_RTE);
}

/* Allocate new ripng information. */
struct ripng_info *ripng_info_new(void)
{
	struct ripng_info *new;

	new = XCALLOC(MTYPE_RIPNG_ROUTE, sizeof(struct ripng_info));
	return new;
}

/* Free ripng information. */
void ripng_info_free(struct ripng_info *rinfo)
{
	XFREE(MTYPE_RIPNG_ROUTE, rinfo);
}

struct ripng *ripng_info_get_instance(const struct ripng_info *rinfo)
{
	return agg_get_table_info(agg_get_table(rinfo->rp));
}

/* Create ripng socket. */
int ripng_make_socket(struct vrf *vrf)
{
	int ret;
	int sock;
	struct sockaddr_in6 ripaddr;
	const char *vrf_dev = NULL;

	/* Make datagram socket. */
	if (vrf->vrf_id != VRF_DEFAULT)
		vrf_dev = vrf->name;
	frr_with_privs(&ripngd_privs) {
		sock = vrf_socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP,
				  vrf->vrf_id, vrf_dev);
		if (sock < 0) {
			flog_err_sys(EC_LIB_SOCKET,
				     "Cannot create UDP socket: %s",
				     safe_strerror(errno));
			return -1;
		}
	}

	sockopt_reuseaddr(sock);
	sockopt_reuseport(sock);
	setsockopt_so_recvbuf(sock, 8096);
	ret = setsockopt_ipv6_pktinfo(sock, 1);
	if (ret < 0)
		goto error;
#ifdef IPTOS_PREC_INTERNETCONTROL
	ret = setsockopt_ipv6_tclass(sock, IPTOS_PREC_INTERNETCONTROL);
	if (ret < 0)
		goto error;
#endif
	ret = setsockopt_ipv6_multicast_hops(sock, 255);
	if (ret < 0)
		goto error;
	ret = setsockopt_ipv6_multicast_loop(sock, 0);
	if (ret < 0)
		goto error;
	ret = setsockopt_ipv6_hoplimit(sock, 1);
	if (ret < 0)
		goto error;

	memset(&ripaddr, 0, sizeof(ripaddr));
	ripaddr.sin6_family = AF_INET6;
#ifdef SIN6_LEN
	ripaddr.sin6_len = sizeof(struct sockaddr_in6);
#endif /* SIN6_LEN */
	ripaddr.sin6_port = htons(RIPNG_PORT_DEFAULT);

	frr_with_privs(&ripngd_privs) {
		ret = bind(sock, (struct sockaddr *)&ripaddr, sizeof(ripaddr));
		if (ret < 0) {
			zlog_err("Can't bind ripng socket: %s.",
				 safe_strerror(errno));
			goto error;
		}
	}
	return sock;

error:
	close(sock);
	return ret;
}

/* Send RIPng packet. */
int ripng_send_packet(caddr_t buf, int bufsize, struct sockaddr_in6 *to,
		      struct interface *ifp)
{
	struct ripng_interface *ri = ifp->info;
	struct ripng *ripng = ri->ripng;
	int ret;
	struct msghdr msg;
	struct iovec iov;
	struct cmsghdr *cmsgptr;
	char adata[256] = {};
	struct in6_pktinfo *pkt;
	struct sockaddr_in6 addr;

	if (IS_RIPNG_DEBUG_SEND) {
		if (to)
			zlog_debug("send to %s", inet6_ntoa(to->sin6_addr));
		zlog_debug("  send interface %s", ifp->name);
		zlog_debug("  send packet size %d", bufsize);
	}

	memset(&addr, 0, sizeof(struct sockaddr_in6));
	addr.sin6_family = AF_INET6;
#ifdef SIN6_LEN
	addr.sin6_len = sizeof(struct sockaddr_in6);
#endif /* SIN6_LEN */
	addr.sin6_flowinfo = htonl(RIPNG_PRIORITY_DEFAULT);

	/* When destination is specified. */
	if (to != NULL) {
		addr.sin6_addr = to->sin6_addr;
		addr.sin6_port = to->sin6_port;
	} else {
		inet_pton(AF_INET6, RIPNG_GROUP, &addr.sin6_addr);
		addr.sin6_port = htons(RIPNG_PORT_DEFAULT);
	}

	memset(&msg, 0, sizeof(msg));
	msg.msg_name = (void *)&addr;
	msg.msg_namelen = sizeof(struct sockaddr_in6);
	msg.msg_iov = &iov;
	msg.msg_iovlen = 1;
	msg.msg_control = (void *)adata;
	msg.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo));

	iov.iov_base = buf;
	iov.iov_len = bufsize;

	cmsgptr = (struct cmsghdr *)adata;
	cmsgptr->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
	cmsgptr->cmsg_level = IPPROTO_IPV6;
	cmsgptr->cmsg_type = IPV6_PKTINFO;

	pkt = (struct in6_pktinfo *)CMSG_DATA(cmsgptr);
	memset(&pkt->ipi6_addr, 0, sizeof(struct in6_addr));
	pkt->ipi6_ifindex = ifp->ifindex;

	ret = sendmsg(ripng->sock, &msg, 0);

	if (ret < 0) {
		if (to)
			flog_err_sys(EC_LIB_SOCKET,
				     "RIPng send fail on %s to %s: %s",
				     ifp->name, inet6_ntoa(to->sin6_addr),
				     safe_strerror(errno));
		else
			flog_err_sys(EC_LIB_SOCKET, "RIPng send fail on %s: %s",
				     ifp->name, safe_strerror(errno));
	}

	return ret;
}

/* Receive UDP RIPng packet from socket. */
static int ripng_recv_packet(int sock, uint8_t *buf, int bufsize,
			     struct sockaddr_in6 *from, ifindex_t *ifindex,
			     int *hoplimit)
{
	int ret;
	struct msghdr msg;
	struct iovec iov;
	struct cmsghdr *cmsgptr;
	struct in6_addr dst = {.s6_addr = {0}};

	memset(&dst, 0, sizeof(struct in6_addr));

	/* Ancillary data.  This store cmsghdr and in6_pktinfo.  But at this
	   point I can't determine size of cmsghdr */
	char adata[1024];

	/* Fill in message and iovec. */
	memset(&msg, 0, sizeof(msg));
	msg.msg_name = (void *)from;
	msg.msg_namelen = sizeof(struct sockaddr_in6);
	msg.msg_iov = &iov;
	msg.msg_iovlen = 1;
	msg.msg_control = (void *)adata;
	msg.msg_controllen = sizeof adata;
	iov.iov_base = buf;
	iov.iov_len = bufsize;

	/* If recvmsg fail return minus value. */
	ret = recvmsg(sock, &msg, 0);
	if (ret < 0)
		return ret;

	for (cmsgptr = CMSG_FIRSTHDR(&msg); cmsgptr != NULL;
	     cmsgptr = CMSG_NXTHDR(&msg, cmsgptr)) {
		/* I want interface index which this packet comes from. */
		if (cmsgptr->cmsg_level == IPPROTO_IPV6
		    && cmsgptr->cmsg_type == IPV6_PKTINFO) {
			struct in6_pktinfo *ptr;

			ptr = (struct in6_pktinfo *)CMSG_DATA(cmsgptr);
			*ifindex = ptr->ipi6_ifindex;
			dst = ptr->ipi6_addr;

			if (*ifindex == 0)
				zlog_warn(
					"Interface index returned by IPV6_PKTINFO is zero");
		}

		/* Incoming packet's multicast hop limit. */
		if (cmsgptr->cmsg_level == IPPROTO_IPV6
		    && cmsgptr->cmsg_type == IPV6_HOPLIMIT) {
			int *phoplimit = (int *)CMSG_DATA(cmsgptr);
			*hoplimit = *phoplimit;
		}
	}

	/* Hoplimit check shold be done when destination address is
	   multicast address. */
	if (!IN6_IS_ADDR_MULTICAST(&dst))
		*hoplimit = -1;

	return ret;
}

/* Dump rip packet */
void ripng_packet_dump(struct ripng_packet *packet, int size,
		       const char *sndrcv)
{
	caddr_t lim;
	struct rte *rte;
	const char *command_str;

	/* Set command string. */
	if (packet->command == RIPNG_REQUEST)
		command_str = "request";
	else if (packet->command == RIPNG_RESPONSE)
		command_str = "response";
	else
		command_str = "unknown";

	/* Dump packet header. */
	zlog_debug("%s %s version %d packet size %d", sndrcv, command_str,
		   packet->version, size);

	/* Dump each routing table entry. */
	rte = packet->rte;

	for (lim = (caddr_t)packet + size; (caddr_t)rte < lim; rte++) {
		if (rte->metric == RIPNG_METRIC_NEXTHOP)
			zlog_debug("  nexthop %s/%d", inet6_ntoa(rte->addr),
				   rte->prefixlen);
		else
			zlog_debug("  %s/%d metric %d tag %" ROUTE_TAG_PRI,
				   inet6_ntoa(rte->addr), rte->prefixlen,
				   rte->metric, (route_tag_t)ntohs(rte->tag));
	}
}

/* RIPng next hop address RTE (Route Table Entry). */
static void ripng_nexthop_rte(struct rte *rte, struct sockaddr_in6 *from,
			      struct ripng_nexthop *nexthop)
{
	char buf[INET6_BUFSIZ];

	/* Logging before checking RTE. */
	if (IS_RIPNG_DEBUG_RECV)
		zlog_debug("RIPng nexthop RTE address %s tag %" ROUTE_TAG_PRI
			   " prefixlen %d",
			   inet6_ntoa(rte->addr), (route_tag_t)ntohs(rte->tag),
			   rte->prefixlen);

	/* RFC2080 2.1.1 Next Hop:
	 The route tag and prefix length in the next hop RTE must be
	 set to zero on sending and ignored on receiption.  */
	if (ntohs(rte->tag) != 0)
		zlog_warn(
			"RIPng nexthop RTE with non zero tag value %" ROUTE_TAG_PRI
			" from %s",
			(route_tag_t)ntohs(rte->tag),
			inet6_ntoa(from->sin6_addr));

	if (rte->prefixlen != 0)
		zlog_warn(
			"RIPng nexthop RTE with non zero prefixlen value %d from %s",
			rte->prefixlen, inet6_ntoa(from->sin6_addr));

	/* Specifying a value of 0:0:0:0:0:0:0:0 in the prefix field of a
	 next hop RTE indicates that the next hop address should be the
	 originator of the RIPng advertisement.  An address specified as a
	 next hop must be a link-local address.  */
	if (IN6_IS_ADDR_UNSPECIFIED(&rte->addr)) {
		nexthop->flag = RIPNG_NEXTHOP_UNSPEC;
		memset(&nexthop->address, 0, sizeof(struct in6_addr));
		return;
	}

	if (IN6_IS_ADDR_LINKLOCAL(&rte->addr)) {
		nexthop->flag = RIPNG_NEXTHOP_ADDRESS;
		IPV6_ADDR_COPY(&nexthop->address, &rte->addr);
		return;
	}

	/* The purpose of the next hop RTE is to eliminate packets being
	 routed through extra hops in the system.  It is particularly useful
	 when RIPng is not being run on all of the routers on a network.
	 Note that next hop RTE is "advisory".  That is, if the provided
	 information is ignored, a possibly sub-optimal, but absolutely
	 valid, route may be taken.  If the received next hop address is not
	 a link-local address, it should be treated as 0:0:0:0:0:0:0:0.  */
	zlog_warn("RIPng nexthop RTE with non link-local address %s from %s",
		  inet6_ntoa(rte->addr),
		  inet_ntop(AF_INET6, &from->sin6_addr, buf, INET6_BUFSIZ));

	nexthop->flag = RIPNG_NEXTHOP_UNSPEC;
	memset(&nexthop->address, 0, sizeof(struct in6_addr));

	return;
}

/* If ifp has same link-local address then return 1. */
static int ripng_lladdr_check(struct interface *ifp, struct in6_addr *addr)
{
	struct listnode *node;
	struct connected *connected;
	struct prefix *p;

	for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, connected)) {
		p = connected->address;

		if (p->family == AF_INET6
		    && IN6_IS_ADDR_LINKLOCAL(&p->u.prefix6)
		    && IN6_ARE_ADDR_EQUAL(&p->u.prefix6, addr))
			return 1;
	}
	return 0;
}

/* RIPng route garbage collect timer. */
static int ripng_garbage_collect(struct thread *t)
{
	struct ripng_info *rinfo;
	struct agg_node *rp;

	rinfo = THREAD_ARG(t);
	rinfo->t_garbage_collect = NULL;

	/* Off timeout timer. */
	RIPNG_TIMER_OFF(rinfo->t_timeout);

	/* Get route_node pointer. */
	rp = rinfo->rp;

	/* Unlock route_node. */
	listnode_delete(rp->info, rinfo);
	if (list_isempty((struct list *)rp->info)) {
		list_delete((struct list **)&rp->info);
		agg_unlock_node(rp);
	}

	/* Free RIPng routing information. */
	ripng_info_free(rinfo);

	return 0;
}

static void ripng_timeout_update(struct ripng *ripng, struct ripng_info *rinfo);

/* Add new route to the ECMP list.
 * RETURN: the new entry added in the list, or NULL if it is not the first
 *         entry and ECMP is not allowed.
 */
struct ripng_info *ripng_ecmp_add(struct ripng *ripng,
				  struct ripng_info *rinfo_new)
{
	struct agg_node *rp = rinfo_new->rp;
	struct ripng_info *rinfo = NULL;
	struct list *list = NULL;

	if (rp->info == NULL)
		rp->info = list_new();
	list = (struct list *)rp->info;

	/* If ECMP is not allowed and some entry already exists in the list,
	 * do nothing. */
	if (listcount(list) && !ripng->ecmp)
		return NULL;

	rinfo = ripng_info_new();
	memcpy(rinfo, rinfo_new, sizeof(struct ripng_info));
	listnode_add(list, rinfo);

	if (ripng_route_rte(rinfo)) {
		ripng_timeout_update(ripng, rinfo);
		ripng_zebra_ipv6_add(ripng, rp);
	}

	ripng_aggregate_increment(rp, rinfo);

	/* Set the route change flag on the first entry. */
	rinfo = listgetdata(listhead(list));
	SET_FLAG(rinfo->flags, RIPNG_RTF_CHANGED);

	/* Signal the output process to trigger an update. */
	ripng_event(ripng, RIPNG_TRIGGERED_UPDATE, 0);

	return rinfo;
}

/* Replace the ECMP list with the new route.
 * RETURN: the new entry added in the list
 */
struct ripng_info *ripng_ecmp_replace(struct ripng *ripng,
				      struct ripng_info *rinfo_new)
{
	struct agg_node *rp = rinfo_new->rp;
	struct list *list = (struct list *)rp->info;
	struct ripng_info *rinfo = NULL, *tmp_rinfo = NULL;
	struct listnode *node = NULL, *nextnode = NULL;

	if (list == NULL || listcount(list) == 0)
		return ripng_ecmp_add(ripng, rinfo_new);

	/* Get the first entry */
	rinfo = listgetdata(listhead(list));

	/* Learnt route replaced by a local one. Delete it from zebra. */
	if (ripng_route_rte(rinfo) && !ripng_route_rte(rinfo_new))
		if (CHECK_FLAG(rinfo->flags, RIPNG_RTF_FIB))
			ripng_zebra_ipv6_delete(ripng, rp);

	if (rinfo->metric != RIPNG_METRIC_INFINITY)
		ripng_aggregate_decrement_list(rp, list);

	/* Re-use the first entry, and delete the others. */
	for (ALL_LIST_ELEMENTS(list, node, nextnode, tmp_rinfo))
		if (tmp_rinfo != rinfo) {
			RIPNG_TIMER_OFF(tmp_rinfo->t_timeout);
			RIPNG_TIMER_OFF(tmp_rinfo->t_garbage_collect);
			list_delete_node(list, node);
			ripng_info_free(tmp_rinfo);
		}

	RIPNG_TIMER_OFF(rinfo->t_timeout);
	RIPNG_TIMER_OFF(rinfo->t_garbage_collect);
	memcpy(rinfo, rinfo_new, sizeof(struct ripng_info));

	if (ripng_route_rte(rinfo)) {
		ripng_timeout_update(ripng, rinfo);
		/* The ADD message implies an update. */
		ripng_zebra_ipv6_add(ripng, rp);
	}

	ripng_aggregate_increment(rp, rinfo);

	/* Set the route change flag. */
	SET_FLAG(rinfo->flags, RIPNG_RTF_CHANGED);

	/* Signal the output process to trigger an update. */
	ripng_event(ripng, RIPNG_TRIGGERED_UPDATE, 0);

	return rinfo;
}

/* Delete one route from the ECMP list.
 * RETURN:
 *  null - the entry is freed, and other entries exist in the list
 *  the entry - the entry is the last one in the list; its metric is set
 *              to INFINITY, and the garbage collector is started for it
 */
struct ripng_info *ripng_ecmp_delete(struct ripng *ripng,
				     struct ripng_info *rinfo)
{
	struct agg_node *rp = rinfo->rp;
	struct list *list = (struct list *)rp->info;

	RIPNG_TIMER_OFF(rinfo->t_timeout);

	if (rinfo->metric != RIPNG_METRIC_INFINITY)
		ripng_aggregate_decrement(rp, rinfo);

	if (listcount(list) > 1) {
		/* Some other ECMP entries still exist. Just delete this entry.
		 */
		RIPNG_TIMER_OFF(rinfo->t_garbage_collect);
		listnode_delete(list, rinfo);
		if (ripng_route_rte(rinfo)
		    && CHECK_FLAG(rinfo->flags, RIPNG_RTF_FIB))
			/* The ADD message implies the update. */
			ripng_zebra_ipv6_add(ripng, rp);
		ripng_info_free(rinfo);
		rinfo = NULL;
	} else {
		assert(rinfo == listgetdata(listhead(list)));

		/* This is the only entry left in the list. We must keep it in
		 * the list for garbage collection time, with INFINITY metric.
		 */

		rinfo->metric = RIPNG_METRIC_INFINITY;
		RIPNG_TIMER_ON(rinfo->t_garbage_collect, ripng_garbage_collect,
			       ripng->garbage_time);

		if (ripng_route_rte(rinfo)
		    && CHECK_FLAG(rinfo->flags, RIPNG_RTF_FIB))
			ripng_zebra_ipv6_delete(ripng, rp);
	}

	/* Set the route change flag on the first entry. */
	rinfo = listgetdata(listhead(list));
	SET_FLAG(rinfo->flags, RIPNG_RTF_CHANGED);

	/* Signal the output process to trigger an update. */
	ripng_event(ripng, RIPNG_TRIGGERED_UPDATE, 0);

	return rinfo;
}

/* Timeout RIPng routes. */
static int ripng_timeout(struct thread *t)
{
	struct ripng_info *rinfo = THREAD_ARG(t);
	struct ripng *ripng = ripng_info_get_instance(rinfo);

	ripng_ecmp_delete(ripng, rinfo);

	return 0;
}

static void ripng_timeout_update(struct ripng *ripng, struct ripng_info *rinfo)
{
	if (rinfo->metric != RIPNG_METRIC_INFINITY) {
		RIPNG_TIMER_OFF(rinfo->t_timeout);
		thread_add_timer(master, ripng_timeout, rinfo,
				 ripng->timeout_time, &rinfo->t_timeout);
	}
}

static int ripng_filter(int ripng_distribute, struct prefix_ipv6 *p,
			struct ripng_interface *ri)
{
	struct distribute *dist;
	struct access_list *alist;
	struct prefix_list *plist;
	int distribute = ripng_distribute == RIPNG_FILTER_OUT
				 ? DISTRIBUTE_V6_OUT
				 : DISTRIBUTE_V6_IN;
	const char *inout = ripng_distribute == RIPNG_FILTER_OUT ? "out" : "in";

	/* Input distribute-list filtering. */
	if (ri->list[ripng_distribute]) {
		if (access_list_apply(ri->list[ripng_distribute],
				      (struct prefix *)p)
		    == FILTER_DENY) {
			if (IS_RIPNG_DEBUG_PACKET)
				zlog_debug("%s/%d filtered by distribute %s",
					   inet6_ntoa(p->prefix), p->prefixlen,
					   inout);
			return -1;
		}
	}
	if (ri->prefix[ripng_distribute]) {
		if (prefix_list_apply(ri->prefix[ripng_distribute],
				      (struct prefix *)p)
		    == PREFIX_DENY) {
			if (IS_RIPNG_DEBUG_PACKET)
				zlog_debug("%s/%d filtered by prefix-list %s",
					   inet6_ntoa(p->prefix), p->prefixlen,
					   inout);
			return -1;
		}
	}

	/* All interface filter check. */
	dist = distribute_lookup(ri->ripng->distribute_ctx, NULL);
	if (dist) {
		if (dist->list[distribute]) {
			alist = access_list_lookup(AFI_IP6,
						   dist->list[distribute]);

			if (alist) {
				if (access_list_apply(alist, (struct prefix *)p)
				    == FILTER_DENY) {
					if (IS_RIPNG_DEBUG_PACKET)
						zlog_debug(
							"%s/%d filtered by distribute %s",
							inet6_ntoa(p->prefix),
							p->prefixlen, inout);
					return -1;
				}
			}
		}
		if (dist->prefix[distribute]) {
			plist = prefix_list_lookup(AFI_IP6,
						   dist->prefix[distribute]);

			if (plist) {
				if (prefix_list_apply(plist, (struct prefix *)p)
				    == PREFIX_DENY) {
					if (IS_RIPNG_DEBUG_PACKET)
						zlog_debug(
							"%s/%d filtered by prefix-list %s",
							inet6_ntoa(p->prefix),
							p->prefixlen, inout);
					return -1;
				}
			}
		}
	}
	return 0;
}

/* Process RIPng route according to RFC2080. */
static void ripng_route_process(struct rte *rte, struct sockaddr_in6 *from,
				struct ripng_nexthop *ripng_nexthop,
				struct interface *ifp)
{
	int ret;
	struct prefix_ipv6 p;
	struct agg_node *rp;
	struct ripng_info *rinfo = NULL, newinfo;
	struct ripng_interface *ri;
	struct ripng *ripng;
	struct in6_addr *nexthop;
	int same = 0;
	struct list *list = NULL;
	struct listnode *node = NULL;

	/* Make prefix structure. */
	memset(&p, 0, sizeof(struct prefix_ipv6));
	p.family = AF_INET6;
	/* p.prefix = rte->addr; */
	IPV6_ADDR_COPY(&p.prefix, &rte->addr);
	p.prefixlen = rte->prefixlen;

	/* Make sure mask is applied. */
	/* XXX We have to check the prefix is valid or not before call
	   apply_mask_ipv6. */
	apply_mask_ipv6(&p);

	ri = ifp->info;
	ripng = ri->ripng;

	/* Apply input filters. */
	ret = ripng_filter(RIPNG_FILTER_IN, &p, ri);
	if (ret < 0)
		return;

	memset(&newinfo, 0, sizeof(newinfo));
	newinfo.type = ZEBRA_ROUTE_RIPNG;
	newinfo.sub_type = RIPNG_ROUTE_RTE;
	if (ripng_nexthop->flag == RIPNG_NEXTHOP_ADDRESS)
		newinfo.nexthop = ripng_nexthop->address;
	else
		newinfo.nexthop = from->sin6_addr;
	newinfo.from = from->sin6_addr;
	newinfo.ifindex = ifp->ifindex;
	newinfo.metric = rte->metric;
	newinfo.metric_out = rte->metric; /* XXX */
	newinfo.tag = ntohs(rte->tag);    /* XXX */

	/* Modify entry. */
	if (ri->routemap[RIPNG_FILTER_IN]) {
		ret = route_map_apply(ri->routemap[RIPNG_FILTER_IN],
				      (struct prefix *)&p, RMAP_RIPNG,
				      &newinfo);

		if (ret == RMAP_DENYMATCH) {
			if (IS_RIPNG_DEBUG_PACKET)
				zlog_debug(
					"RIPng %s/%d is filtered by route-map in",
					inet6_ntoa(p.prefix), p.prefixlen);
			return;
		}

		/* Get back the object */
		if (ripng_nexthop->flag == RIPNG_NEXTHOP_ADDRESS) {
			if (!IPV6_ADDR_SAME(&newinfo.nexthop,
					    &ripng_nexthop->address)) {
				/* the nexthop get changed by the routemap */
				if (IN6_IS_ADDR_LINKLOCAL(&newinfo.nexthop))
					ripng_nexthop->address =
						newinfo.nexthop;
				else
					ripng_nexthop->address = in6addr_any;
			}
		} else {
			if (!IPV6_ADDR_SAME(&newinfo.nexthop,
					    &from->sin6_addr)) {
				/* the nexthop get changed by the routemap */
				if (IN6_IS_ADDR_LINKLOCAL(&newinfo.nexthop)) {
					ripng_nexthop->flag =
						RIPNG_NEXTHOP_ADDRESS;
					ripng_nexthop->address =
						newinfo.nexthop;
				}
			}
		}
		rte->tag = htons(newinfo.tag_out); /* XXX */
		rte->metric =
			newinfo.metric_out; /* XXX: the routemap uses the
					       metric_out field */
	}

	/* Once the entry has been validated, update the metric by
	 * adding the cost of the network on wich the message
	 * arrived. If the result is greater than infinity, use infinity
	 * (RFC2453 Sec. 3.9.2)
	 **/

	/* Zebra ripngd can handle offset-list in. */
	ret = ripng_offset_list_apply_in(ripng, &p, ifp, &rte->metric);

	/* If offset-list does not modify the metric use interface's
	 * one. */
	if (!ret)
		rte->metric += ifp->metric ? ifp->metric : 1;

	if (rte->metric > RIPNG_METRIC_INFINITY)
		rte->metric = RIPNG_METRIC_INFINITY;

	/* Set nexthop pointer. */
	if (ripng_nexthop->flag == RIPNG_NEXTHOP_ADDRESS)
		nexthop = &ripng_nexthop->address;
	else
		nexthop = &from->sin6_addr;

	/* Lookup RIPng routing table. */
	rp = agg_node_get(ripng->table, (struct prefix *)&p);

	newinfo.rp = rp;
	newinfo.nexthop = *nexthop;
	newinfo.metric = rte->metric;
	newinfo.tag = ntohs(rte->tag);

	/* Check to see whether there is already RIPng route on the table. */
	if ((list = rp->info) != NULL)
		for (ALL_LIST_ELEMENTS_RO(list, node, rinfo)) {
			/* Need to compare with redistributed entry or local
			 * entry */
			if (!ripng_route_rte(rinfo))
				break;

			if (IPV6_ADDR_SAME(&rinfo->from, &from->sin6_addr)
			    && IPV6_ADDR_SAME(&rinfo->nexthop, nexthop))
				break;

			if (!listnextnode(node)) {
				/* Not found in the list */

				if (rte->metric > rinfo->metric) {
					/* New route has a greater metric.
					 * Discard it. */
					agg_unlock_node(rp);
					return;
				}

				if (rte->metric < rinfo->metric)
					/* New route has a smaller metric.
					 * Replace the ECMP list
					 * with the new one in below. */
					break;

				/* Metrics are same. Unless ECMP is disabled,
				 * keep "rinfo" null and
				 * the new route is added in the ECMP list in
				 * below. */
				if (!ripng->ecmp)
					break;
			}
		}

	if (rinfo) {
		/* Redistributed route check. */
		if (rinfo->type != ZEBRA_ROUTE_RIPNG
		    && rinfo->metric != RIPNG_METRIC_INFINITY) {
			agg_unlock_node(rp);
			return;
		}

		/* Local static route. */
		if (rinfo->type == ZEBRA_ROUTE_RIPNG
		    && ((rinfo->sub_type == RIPNG_ROUTE_STATIC)
			|| (rinfo->sub_type == RIPNG_ROUTE_DEFAULT))
		    && rinfo->metric != RIPNG_METRIC_INFINITY) {
			agg_unlock_node(rp);
			return;
		}
	}

	if (!rinfo) {
		/* Now, check to see whether there is already an explicit route
		   for the destination prefix.  If there is no such route, add
		   this route to the routing table, unless the metric is
		   infinity (there is no point in adding a route which
		   unusable). */
		if (rte->metric != RIPNG_METRIC_INFINITY)
			ripng_ecmp_add(ripng, &newinfo);
		else
			agg_unlock_node(rp);
	} else {
		/* If there is an existing route, compare the next hop address
		   to the address of the router from which the datagram came.
		   If this datagram is from the same router as the existing
		   route, reinitialize the timeout.  */
		same = (IN6_ARE_ADDR_EQUAL(&rinfo->from, &from->sin6_addr)
			&& (rinfo->ifindex == ifp->ifindex));

		/*
		 * RFC 2080 - Section 2.4.2:
		 * "If the new metric is the same as the old one, examine the
		 * timeout
		 * for the existing route.  If it is at least halfway to the
		 * expiration
		 * point, switch to the new route.  This heuristic is optional,
		 * but
		 * highly recommended".
		 */
		if (!ripng->ecmp && !same && rinfo->metric == rte->metric
		    && rinfo->t_timeout
		    && (thread_timer_remain_second(rinfo->t_timeout)
			< (ripng->timeout_time / 2))) {
			ripng_ecmp_replace(ripng, &newinfo);
		}
		/* Next, compare the metrics.  If the datagram is from the same
		   router as the existing route, and the new metric is different
		   than the old one; or, if the new metric is lower than the old
		   one; do the following actions: */
		else if ((same && rinfo->metric != rte->metric)
			 || rte->metric < rinfo->metric) {
			if (listcount(list) == 1) {
				if (newinfo.metric != RIPNG_METRIC_INFINITY)
					ripng_ecmp_replace(ripng, &newinfo);
				else
					ripng_ecmp_delete(ripng, rinfo);
			} else {
				if (newinfo.metric < rinfo->metric)
					ripng_ecmp_replace(ripng, &newinfo);
				else /* newinfo.metric > rinfo->metric */
					ripng_ecmp_delete(ripng, rinfo);
			}
		} else /* same & no change */
			ripng_timeout_update(ripng, rinfo);

		/* Unlock tempolary lock of the route. */
		agg_unlock_node(rp);
	}
}

/* Add redistributed route to RIPng table. */
void ripng_redistribute_add(struct ripng *ripng, int type, int sub_type,
			    struct prefix_ipv6 *p, ifindex_t ifindex,
			    struct in6_addr *nexthop, route_tag_t tag)
{
	struct agg_node *rp;
	struct ripng_info *rinfo = NULL, newinfo;
	struct list *list = NULL;

	/* Redistribute route  */
	if (IN6_IS_ADDR_LINKLOCAL(&p->prefix))
		return;
	if (IN6_IS_ADDR_LOOPBACK(&p->prefix))
		return;

	rp = agg_node_get(ripng->table, (struct prefix *)p);

	memset(&newinfo, 0, sizeof(struct ripng_info));
	newinfo.type = type;
	newinfo.sub_type = sub_type;
	newinfo.ifindex = ifindex;
	newinfo.metric = 1;
	if (tag <= UINT16_MAX) /* RIPng only supports 16 bit tags */
		newinfo.tag = tag;
	newinfo.rp = rp;
	if (nexthop && IN6_IS_ADDR_LINKLOCAL(nexthop))
		newinfo.nexthop = *nexthop;

	if ((list = rp->info) != NULL && listcount(list) != 0) {
		rinfo = listgetdata(listhead(list));

		if (rinfo->type == ZEBRA_ROUTE_CONNECT
		    && rinfo->sub_type == RIPNG_ROUTE_INTERFACE
		    && rinfo->metric != RIPNG_METRIC_INFINITY) {
			agg_unlock_node(rp);
			return;
		}

		/* Manually configured RIPng route check.
		 * They have the precedence on all the other entries.
		 **/
		if (rinfo->type == ZEBRA_ROUTE_RIPNG
		    && ((rinfo->sub_type == RIPNG_ROUTE_STATIC)
			|| (rinfo->sub_type == RIPNG_ROUTE_DEFAULT))) {
			if (type != ZEBRA_ROUTE_RIPNG
			    || ((sub_type != RIPNG_ROUTE_STATIC)
				&& (sub_type != RIPNG_ROUTE_DEFAULT))) {
				agg_unlock_node(rp);
				return;
			}
		}

		ripng_ecmp_replace(ripng, &newinfo);
		agg_unlock_node(rp);
	} else
		ripng_ecmp_add(ripng, &newinfo);

	if (IS_RIPNG_DEBUG_EVENT) {
		if (!nexthop)
			zlog_debug(
				"Redistribute new prefix %s/%d on the interface %s",
				inet6_ntoa(p->prefix), p->prefixlen,
				ifindex2ifname(ifindex, ripng->vrf->vrf_id));
		else
			zlog_debug(
				"Redistribute new prefix %s/%d with nexthop %s on the interface %s",
				inet6_ntoa(p->prefix), p->prefixlen,
				inet6_ntoa(*nexthop),
				ifindex2ifname(ifindex, ripng->vrf->vrf_id));
	}

	ripng_event(ripng, RIPNG_TRIGGERED_UPDATE, 0);
}

/* Delete redistributed route to RIPng table. */
void ripng_redistribute_delete(struct ripng *ripng, int type, int sub_type,
			       struct prefix_ipv6 *p, ifindex_t ifindex)
{
	struct agg_node *rp;
	struct ripng_info *rinfo;

	if (IN6_IS_ADDR_LINKLOCAL(&p->prefix))
		return;
	if (IN6_IS_ADDR_LOOPBACK(&p->prefix))
		return;

	rp = agg_node_lookup(ripng->table, (struct prefix *)p);

	if (rp) {
		struct list *list = rp->info;

		if (list != NULL && listcount(list) != 0) {
			rinfo = listgetdata(listhead(list));
			if (rinfo != NULL && rinfo->type == type
			    && rinfo->sub_type == sub_type
			    && rinfo->ifindex == ifindex) {
				/* Perform poisoned reverse. */
				rinfo->metric = RIPNG_METRIC_INFINITY;
				RIPNG_TIMER_ON(rinfo->t_garbage_collect,
					       ripng_garbage_collect,
					       ripng->garbage_time);
				RIPNG_TIMER_OFF(rinfo->t_timeout);

				/* Aggregate count decrement. */
				ripng_aggregate_decrement(rp, rinfo);

				rinfo->flags |= RIPNG_RTF_CHANGED;

				if (IS_RIPNG_DEBUG_EVENT)
					zlog_debug(
						"Poisone %s/%d on the interface %s with an "
						"infinity metric [delete]",
						inet6_ntoa(p->prefix),
						p->prefixlen,
						ifindex2ifname(
							ifindex,
							ripng->vrf->vrf_id));

				ripng_event(ripng, RIPNG_TRIGGERED_UPDATE, 0);
			}
		}
		agg_unlock_node(rp);
	}
}

/* Withdraw redistributed route. */
void ripng_redistribute_withdraw(struct ripng *ripng, int type)
{
	struct agg_node *rp;
	struct ripng_info *rinfo = NULL;
	struct list *list = NULL;

	for (rp = agg_route_top(ripng->table); rp; rp = agg_route_next(rp))
		if ((list = rp->info) != NULL) {
			rinfo = listgetdata(listhead(list));
			if ((rinfo->type == type)
			    && (rinfo->sub_type != RIPNG_ROUTE_INTERFACE)) {
				/* Perform poisoned reverse. */
				rinfo->metric = RIPNG_METRIC_INFINITY;
				RIPNG_TIMER_ON(rinfo->t_garbage_collect,
					       ripng_garbage_collect,
					       ripng->garbage_time);
				RIPNG_TIMER_OFF(rinfo->t_timeout);

				/* Aggregate count decrement. */
				ripng_aggregate_decrement(rp, rinfo);

				rinfo->flags |= RIPNG_RTF_CHANGED;

				if (IS_RIPNG_DEBUG_EVENT) {
					struct prefix_ipv6 *p =
						(struct prefix_ipv6 *)&rp->p;

					zlog_debug(
						"Poisone %s/%d on the interface %s [withdraw]",
						inet6_ntoa(p->prefix),
						p->prefixlen,
						ifindex2ifname(
							rinfo->ifindex,
							ripng->vrf->vrf_id));
				}

				ripng_event(ripng, RIPNG_TRIGGERED_UPDATE, 0);
			}
		}
}

/* RIP routing information. */
static void ripng_response_process(struct ripng_packet *packet, int size,
				   struct sockaddr_in6 *from,
				   struct interface *ifp, int hoplimit)
{
	struct ripng_interface *ri = ifp->info;
	struct ripng *ripng = ri->ripng;
	caddr_t lim;
	struct rte *rte;
	struct ripng_nexthop nexthop;

	/* RFC2080 2.4.2  Response Messages:
	 The Response must be ignored if it is not from the RIPng port.  */
	if (ntohs(from->sin6_port) != RIPNG_PORT_DEFAULT) {
		zlog_warn("RIPng packet comes from non RIPng port %d from %s",
			  ntohs(from->sin6_port), inet6_ntoa(from->sin6_addr));
		ripng_peer_bad_packet(ripng, from);
		return;
	}

	/* The datagram's IPv6 source address should be checked to see
	 whether the datagram is from a valid neighbor; the source of the
	 datagram must be a link-local address.  */
	if (!IN6_IS_ADDR_LINKLOCAL(&from->sin6_addr)) {
		zlog_warn("RIPng packet comes from non link local address %s",
			  inet6_ntoa(from->sin6_addr));
		ripng_peer_bad_packet(ripng, from);
		return;
	}

	/* It is also worth checking to see whether the response is from one
	 of the router's own addresses.  Interfaces on broadcast networks
	 may receive copies of their own multicasts immediately.  If a
	 router processes its own output as new input, confusion is likely,
	 and such datagrams must be ignored. */
	if (ripng_lladdr_check(ifp, &from->sin6_addr)) {
		zlog_warn(
			"RIPng packet comes from my own link local address %s",
			inet6_ntoa(from->sin6_addr));
		ripng_peer_bad_packet(ripng, from);
		return;
	}

	/* As an additional check, periodic advertisements must have their
	 hop counts set to 255, and inbound, multicast packets sent from the
	 RIPng port (i.e. periodic advertisement or triggered update
	 packets) must be examined to ensure that the hop count is 255. */
	if (hoplimit >= 0 && hoplimit != 255) {
		zlog_warn(
			"RIPng packet comes with non 255 hop count %d from %s",
			hoplimit, inet6_ntoa(from->sin6_addr));
		ripng_peer_bad_packet(ripng, from);
		return;
	}

	/* Update RIPng peer. */
	ripng_peer_update(ripng, from, packet->version);

	/* Reset nexthop. */
	memset(&nexthop, 0, sizeof(struct ripng_nexthop));
	nexthop.flag = RIPNG_NEXTHOP_UNSPEC;

	/* Set RTE pointer. */
	rte = packet->rte;

	for (lim = ((caddr_t)packet) + size; (caddr_t)rte < lim; rte++) {
		/* First of all, we have to check this RTE is next hop RTE or
		   not.  Next hop RTE is completely different with normal RTE so
		   we need special treatment. */
		if (rte->metric == RIPNG_METRIC_NEXTHOP) {
			ripng_nexthop_rte(rte, from, &nexthop);
			continue;
		}

		/* RTE information validation. */

		/* - is the destination prefix valid (e.g., not a multicast
		   prefix and not a link-local address) A link-local address
		   should never be present in an RTE. */
		if (IN6_IS_ADDR_MULTICAST(&rte->addr)) {
			zlog_warn(
				"Destination prefix is a multicast address %s/%d [%d]",
				inet6_ntoa(rte->addr), rte->prefixlen,
				rte->metric);
			ripng_peer_bad_route(ripng, from);
			continue;
		}
		if (IN6_IS_ADDR_LINKLOCAL(&rte->addr)) {
			zlog_warn(
				"Destination prefix is a link-local address %s/%d [%d]",
				inet6_ntoa(rte->addr), rte->prefixlen,
				rte->metric);
			ripng_peer_bad_route(ripng, from);
			continue;
		}
		if (IN6_IS_ADDR_LOOPBACK(&rte->addr)) {
			zlog_warn(
				"Destination prefix is a loopback address %s/%d [%d]",
				inet6_ntoa(rte->addr), rte->prefixlen,
				rte->metric);
			ripng_peer_bad_route(ripng, from);
			continue;
		}

		/* - is the prefix length valid (i.e., between 0 and 128,
		   inclusive) */
		if (rte->prefixlen > 128) {
			zlog_warn("Invalid prefix length %s/%d from %s%%%s",
				  inet6_ntoa(rte->addr), rte->prefixlen,
				  inet6_ntoa(from->sin6_addr), ifp->name);
			ripng_peer_bad_route(ripng, from);
			continue;
		}

		/* - is the metric valid (i.e., between 1 and 16, inclusive) */
		if (!(rte->metric >= 1 && rte->metric <= 16)) {
			zlog_warn("Invalid metric %d from %s%%%s", rte->metric,
				  inet6_ntoa(from->sin6_addr), ifp->name);
			ripng_peer_bad_route(ripng, from);
			continue;
		}

		/* Vincent: XXX Should we compute the direclty reachable nexthop
		 * for our RIPng network ?
		 **/

		/* Routing table updates. */
		ripng_route_process(rte, from, &nexthop, ifp);
	}
}

/* Response to request message. */
static void ripng_request_process(struct ripng_packet *packet, int size,
				  struct sockaddr_in6 *from,
				  struct interface *ifp)
{
	struct ripng *ripng;
	caddr_t lim;
	struct rte *rte;
	struct prefix_ipv6 p;
	struct agg_node *rp;
	struct ripng_info *rinfo;
	struct ripng_interface *ri;

	/* Does not reponse to the requests on the loopback interfaces */
	if (if_is_loopback(ifp))
		return;

	/* Check RIPng process is enabled on this interface. */
	ri = ifp->info;
	if (!ri->running)
		return;
	ripng = ri->ripng;

	/* When passive interface is specified, suppress responses */
	if (ri->passive)
		return;

	/* RIPng peer update. */
	ripng_peer_update(ripng, from, packet->version);

	lim = ((caddr_t)packet) + size;
	rte = packet->rte;

	/* The Request is processed entry by entry.  If there are no
	   entries, no response is given. */
	if (lim == (caddr_t)rte)
		return;

	/* There is one special case.  If there is exactly one entry in the
	   request, and it has a destination prefix of zero, a prefix length
	   of zero, and a metric of infinity (i.e., 16), then this is a
	   request to send the entire routing table.  In that case, a call
	   is made to the output process to send the routing table to the
	   requesting address/port. */
	if (lim == ((caddr_t)(rte + 1)) && IN6_IS_ADDR_UNSPECIFIED(&rte->addr)
	    && rte->prefixlen == 0 && rte->metric == RIPNG_METRIC_INFINITY) {
		/* All route with split horizon */
		ripng_output_process(ifp, from, ripng_all_route);
	} else {
		/* Except for this special case, processing is quite simple.
		   Examine the list of RTEs in the Request one by one.  For each
		   entry, look up the destination in the router's routing
		   database and, if there is a route, put that route's metric in
		   the metric field of the RTE.  If there is no explicit route
		   to the specified destination, put infinity in the metric
		   field.  Once all the entries have been filled in, change the
		   command from Request to Response and send the datagram back
		   to the requestor. */
		memset(&p, 0, sizeof(struct prefix_ipv6));
		p.family = AF_INET6;

		for (; ((caddr_t)rte) < lim; rte++) {
			p.prefix = rte->addr;
			p.prefixlen = rte->prefixlen;
			apply_mask_ipv6(&p);

			rp = agg_node_lookup(ripng->table, (struct prefix *)&p);

			if (rp) {
				rinfo = listgetdata(
					listhead((struct list *)rp->info));
				rte->metric = rinfo->metric;
				agg_unlock_node(rp);
			} else
				rte->metric = RIPNG_METRIC_INFINITY;
		}
		packet->command = RIPNG_RESPONSE;

		ripng_send_packet((caddr_t)packet, size, from, ifp);
	}
}

/* First entry point of reading RIPng packet. */
static int ripng_read(struct thread *thread)
{
	struct ripng *ripng = THREAD_ARG(thread);
	int len;
	int sock;
	struct sockaddr_in6 from;
	struct ripng_packet *packet;
	ifindex_t ifindex = 0;
	struct interface *ifp;
	int hoplimit = -1;

	/* Check ripng is active and alive. */
	assert(ripng != NULL);
	assert(ripng->sock >= 0);

	/* Fetch thread data and set read pointer to empty for event
	   managing.  `sock' sould be same as ripng->sock. */
	sock = THREAD_FD(thread);
	ripng->t_read = NULL;

	/* Add myself to the next event. */
	ripng_event(ripng, RIPNG_READ, sock);

	/* Read RIPng packet. */
	len = ripng_recv_packet(sock, STREAM_DATA(ripng->ibuf),
				STREAM_SIZE(ripng->ibuf), &from, &ifindex,
				&hoplimit);
	if (len < 0) {
		zlog_warn("RIPng recvfrom failed (VRF %s): %s.",
			  ripng->vrf_name, safe_strerror(errno));
		return len;
	}

	/* Check RTE boundary.  RTE size (Packet length - RIPng header size
	   (4)) must be multiple size of one RTE size (20). */
	if (((len - 4) % 20) != 0) {
		zlog_warn("RIPng invalid packet size %d from %s (VRF %s)", len,
			  inet6_ntoa(from.sin6_addr), ripng->vrf_name);
		ripng_peer_bad_packet(ripng, &from);
		return 0;
	}

	packet = (struct ripng_packet *)STREAM_DATA(ripng->ibuf);
	ifp = if_lookup_by_index(ifindex, ripng->vrf->vrf_id);

	/* RIPng packet received. */
	if (IS_RIPNG_DEBUG_EVENT)
		zlog_debug(
			"RIPng packet received from %s port %d on %s (VRF %s)",
			inet6_ntoa(from.sin6_addr), ntohs(from.sin6_port),
			ifp ? ifp->name : "unknown", ripng->vrf_name);

	/* Logging before packet checking. */
	if (IS_RIPNG_DEBUG_RECV)
		ripng_packet_dump(packet, len, "RECV");

	/* Packet comes from unknown interface. */
	if (ifp == NULL) {
		zlog_warn(
			"RIPng packet comes from unknown interface %d (VRF %s)",
			ifindex, ripng->vrf_name);
		return 0;
	}

	/* Packet version mismatch checking. */
	if (packet->version != ripng->version) {
		zlog_warn(
			"RIPng packet version %d doesn't fit to my version %d (VRF %s)",
			packet->version, ripng->version, ripng->vrf_name);
		ripng_peer_bad_packet(ripng, &from);
		return 0;
	}

	/* Process RIPng packet. */
	switch (packet->command) {
	case RIPNG_REQUEST:
		ripng_request_process(packet, len, &from, ifp);
		break;
	case RIPNG_RESPONSE:
		ripng_response_process(packet, len, &from, ifp, hoplimit);
		break;
	default:
		zlog_warn("Invalid RIPng command %d (VRF %s)", packet->command,
			  ripng->vrf_name);
		ripng_peer_bad_packet(ripng, &from);
		break;
	}
	return 0;
}

/* Walk down the RIPng routing table then clear changed flag. */
static void ripng_clear_changed_flag(struct ripng *ripng)
{
	struct agg_node *rp;
	struct ripng_info *rinfo = NULL;
	struct list *list = NULL;
	struct listnode *listnode = NULL;

	for (rp = agg_route_top(ripng->table); rp; rp = agg_route_next(rp))
		if ((list = rp->info) != NULL)
			for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) {
				UNSET_FLAG(rinfo->flags, RIPNG_RTF_CHANGED);
				/* This flag can be set only on the first entry.
				 */
				break;
			}
}

/* Regular update of RIPng route.  Send all routing formation to RIPng
   enabled interface. */
static int ripng_update(struct thread *t)
{
	struct ripng *ripng = THREAD_ARG(t);
	struct interface *ifp;
	struct ripng_interface *ri;

	/* Clear update timer thread. */
	ripng->t_update = NULL;

	/* Logging update event. */
	if (IS_RIPNG_DEBUG_EVENT)
		zlog_debug("RIPng update timer expired!");

	/* Supply routes to each interface. */
	FOR_ALL_INTERFACES (ripng->vrf, ifp) {
		ri = ifp->info;

		if (if_is_loopback(ifp) || !if_is_up(ifp))
			continue;

		if (!ri->running)
			continue;

		/* When passive interface is specified, suppress announce to the
		   interface. */
		if (ri->passive)
			continue;

#if RIPNG_ADVANCED
		if (ri->ri_send == RIPNG_SEND_OFF) {
			if (IS_RIPNG_DEBUG_EVENT)
				zlog_debug(
					"[Event] RIPng send to if %d is suppressed by config",
					ifp->ifindex);
			continue;
		}
#endif /* RIPNG_ADVANCED */

		ripng_output_process(ifp, NULL, ripng_all_route);
	}

	/* Triggered updates may be suppressed if a regular update is due by
	   the time the triggered update would be sent. */
	if (ripng->t_triggered_interval) {
		thread_cancel(ripng->t_triggered_interval);
		ripng->t_triggered_interval = NULL;
	}
	ripng->trigger = 0;

	/* Reset flush event. */
	ripng_event(ripng, RIPNG_UPDATE_EVENT, 0);

	return 0;
}

/* Triggered update interval timer. */
static int ripng_triggered_interval(struct thread *t)
{
	struct ripng *ripng = THREAD_ARG(t);

	ripng->t_triggered_interval = NULL;

	if (ripng->trigger) {
		ripng->trigger = 0;
		ripng_triggered_update(t);
	}
	return 0;
}

/* Execute triggered update. */
int ripng_triggered_update(struct thread *t)
{
	struct ripng *ripng = THREAD_ARG(t);
	struct interface *ifp;
	struct ripng_interface *ri;
	int interval;

	ripng->t_triggered_update = NULL;

	/* Cancel interval timer. */
	if (ripng->t_triggered_interval) {
		thread_cancel(ripng->t_triggered_interval);
		ripng->t_triggered_interval = NULL;
	}
	ripng->trigger = 0;

	/* Logging triggered update. */
	if (IS_RIPNG_DEBUG_EVENT)
		zlog_debug("RIPng triggered update!");

	/* Split Horizon processing is done when generating triggered
	   updates as well as normal updates (see section 2.6). */
	FOR_ALL_INTERFACES (ripng->vrf, ifp) {
		ri = ifp->info;

		if (if_is_loopback(ifp) || !if_is_up(ifp))
			continue;

		if (!ri->running)
			continue;

		/* When passive interface is specified, suppress announce to the
		   interface. */
		if (ri->passive)
			continue;

		ripng_output_process(ifp, NULL, ripng_changed_route);
	}

	/* Once all of the triggered updates have been generated, the route
	   change flags should be cleared. */
	ripng_clear_changed_flag(ripng);

	/* After a triggered update is sent, a timer should be set for a
	   random interval between 1 and 5 seconds.  If other changes that
	   would trigger updates occur before the timer expires, a single
	   update is triggered when the timer expires. */
	interval = (random() % 5) + 1;

	ripng->t_triggered_interval = NULL;
	thread_add_timer(master, ripng_triggered_interval, ripng, interval,
			 &ripng->t_triggered_interval);

	return 0;
}

/* Write routing table entry to the stream and return next index of
   the routing table entry in the stream. */
int ripng_write_rte(int num, struct stream *s, struct prefix_ipv6 *p,
		    struct in6_addr *nexthop, uint16_t tag, uint8_t metric)
{
	/* RIPng packet header. */
	if (num == 0) {
		stream_putc(s, RIPNG_RESPONSE);
		stream_putc(s, RIPNG_V1);
		stream_putw(s, 0);
	}

	/* Write routing table entry. */
	if (!nexthop) {
		assert(p);
		stream_write(s, (uint8_t *)&p->prefix, sizeof(struct in6_addr));
	} else
		stream_write(s, (uint8_t *)nexthop, sizeof(struct in6_addr));
	stream_putw(s, tag);
	if (p)
		stream_putc(s, p->prefixlen);
	else
		stream_putc(s, 0);
	stream_putc(s, metric);

	return ++num;
}

/* Send RESPONSE message to specified destination. */
void ripng_output_process(struct interface *ifp, struct sockaddr_in6 *to,
			  int route_type)
{
	struct ripng *ripng;
	int ret;
	struct agg_node *rp;
	struct ripng_info *rinfo;
	struct ripng_interface *ri;
	struct ripng_aggregate *aggregate;
	struct prefix_ipv6 *p;
	struct list *ripng_rte_list;
	struct list *list = NULL;
	struct listnode *listnode = NULL;

	if (IS_RIPNG_DEBUG_EVENT) {
		if (to)
			zlog_debug("RIPng update routes to neighbor %s",
				   inet6_ntoa(to->sin6_addr));
		else
			zlog_debug("RIPng update routes on interface %s",
				   ifp->name);
	}

	/* Get RIPng interface and instance. */
	ri = ifp->info;
	ripng = ri->ripng;

	ripng_rte_list = ripng_rte_new();

	for (rp = agg_route_top(ripng->table); rp; rp = agg_route_next(rp)) {
		if ((list = rp->info) != NULL
		    && (rinfo = listgetdata(listhead(list))) != NULL
		    && rinfo->suppress == 0) {
			/* If no route-map are applied, the RTE will be these
			 * following
			 * information.
			 */
			p = (struct prefix_ipv6 *)&rp->p;
			rinfo->metric_out = rinfo->metric;
			rinfo->tag_out = rinfo->tag;
			memset(&rinfo->nexthop_out, 0,
			       sizeof(rinfo->nexthop_out));
			/* In order to avoid some local loops,
			 * if the RIPng route has a nexthop via this interface,
			 * keep the nexthop,
			 * otherwise set it to 0. The nexthop should not be
			 * propagated
			 * beyond the local broadcast/multicast area in order
			 * to avoid an IGP multi-level recursive look-up.
			 */
			if (rinfo->ifindex == ifp->ifindex)
				rinfo->nexthop_out = rinfo->nexthop;

			/* Apply output filters. */
			ret = ripng_filter(RIPNG_FILTER_OUT, p, ri);
			if (ret < 0)
				continue;

			/* Changed route only output. */
			if (route_type == ripng_changed_route
			    && (!(rinfo->flags & RIPNG_RTF_CHANGED)))
				continue;

			/* Split horizon. */
			if (ri->split_horizon == RIPNG_SPLIT_HORIZON) {
				/* We perform split horizon for RIPng routes. */
				int suppress = 0;
				struct ripng_info *tmp_rinfo = NULL;

				for (ALL_LIST_ELEMENTS_RO(list, listnode,
							  tmp_rinfo))
					if (tmp_rinfo->type == ZEBRA_ROUTE_RIPNG
					    && tmp_rinfo->ifindex
						       == ifp->ifindex) {
						suppress = 1;
						break;
					}
				if (suppress)
					continue;
			}

			/* Preparation for route-map. */
			rinfo->metric_set = 0;
			/* nexthop_out,
			 * metric_out
			 * and tag_out are already initialized.
			 */

			/* Interface route-map */
			if (ri->routemap[RIPNG_FILTER_OUT]) {
				ret = route_map_apply(
					ri->routemap[RIPNG_FILTER_OUT],
					(struct prefix *)p, RMAP_RIPNG, rinfo);

				if (ret == RMAP_DENYMATCH) {
					if (IS_RIPNG_DEBUG_PACKET)
						zlog_debug(
							"RIPng %s/%d is filtered by route-map out",
							inet6_ntoa(p->prefix),
							p->prefixlen);
					continue;
				}
			}

			/* Redistribute route-map. */
			if (ripng->redist[rinfo->type].route_map.name) {
				ret = route_map_apply(ripng->redist[rinfo->type]
							      .route_map.map,
						      (struct prefix *)p,
						      RMAP_RIPNG, rinfo);

				if (ret == RMAP_DENYMATCH) {
					if (IS_RIPNG_DEBUG_PACKET)
						zlog_debug(
							"RIPng %s/%d is filtered by route-map",
							inet6_ntoa(p->prefix),
							p->prefixlen);
					continue;
				}
			}

			/* When the route-map does not set metric. */
			if (!rinfo->metric_set) {
				/* If the redistribute metric is set. */
				if (ripng->redist[rinfo->type].metric_config
				    && rinfo->metric != RIPNG_METRIC_INFINITY) {
					rinfo->metric_out =
						ripng->redist[rinfo->type]
							.metric;
				} else {
					/* If the route is not connected or
					   localy generated
					   one, use default-metric value */
					if (rinfo->type != ZEBRA_ROUTE_RIPNG
					    && rinfo->type
						       != ZEBRA_ROUTE_CONNECT
					    && rinfo->metric
						       != RIPNG_METRIC_INFINITY)
						rinfo->metric_out =
							ripng->default_metric;
				}
			}

			/* Apply offset-list */
			if (rinfo->metric_out != RIPNG_METRIC_INFINITY)
				ripng_offset_list_apply_out(ripng, p, ifp,
							    &rinfo->metric_out);

			if (rinfo->metric_out > RIPNG_METRIC_INFINITY)
				rinfo->metric_out = RIPNG_METRIC_INFINITY;

			/* Perform split-horizon with poisoned reverse
			 * for RIPng routes.
			 **/
			if (ri->split_horizon
			    == RIPNG_SPLIT_HORIZON_POISONED_REVERSE) {
				struct ripng_info *tmp_rinfo = NULL;

				for (ALL_LIST_ELEMENTS_RO(list, listnode,
							  tmp_rinfo))
					if ((tmp_rinfo->type
					     == ZEBRA_ROUTE_RIPNG)
					    && tmp_rinfo->ifindex
						       == ifp->ifindex)
						rinfo->metric_out =
							RIPNG_METRIC_INFINITY;
			}

			/* Add RTE to the list */
			ripng_rte_add(ripng_rte_list, p, rinfo, NULL);
		}

		/* Process the aggregated RTE entry */
		if ((aggregate = rp->aggregate) != NULL && aggregate->count > 0
		    && aggregate->suppress == 0) {
			/* If no route-map are applied, the RTE will be these
			 * following
			 * information.
			 */
			p = (struct prefix_ipv6 *)&rp->p;
			aggregate->metric_set = 0;
			aggregate->metric_out = aggregate->metric;
			aggregate->tag_out = aggregate->tag;
			memset(&aggregate->nexthop_out, 0,
			       sizeof(aggregate->nexthop_out));

			/* Apply output filters.*/
			ret = ripng_filter(RIPNG_FILTER_OUT, p, ri);
			if (ret < 0)
				continue;

			/* Interface route-map */
			if (ri->routemap[RIPNG_FILTER_OUT]) {
				struct ripng_info newinfo;

				/* let's cast the aggregate structure to
				 * ripng_info */
				memset(&newinfo, 0, sizeof(struct ripng_info));
				/* the nexthop is :: */
				newinfo.metric = aggregate->metric;
				newinfo.metric_out = aggregate->metric_out;
				newinfo.tag = aggregate->tag;
				newinfo.tag_out = aggregate->tag_out;

				ret = route_map_apply(
					ri->routemap[RIPNG_FILTER_OUT],
					(struct prefix *)p, RMAP_RIPNG,
					&newinfo);

				if (ret == RMAP_DENYMATCH) {
					if (IS_RIPNG_DEBUG_PACKET)
						zlog_debug(
							"RIPng %s/%d is filtered by route-map out",
							inet6_ntoa(p->prefix),
							p->prefixlen);
					continue;
				}

				aggregate->metric_out = newinfo.metric_out;
				aggregate->tag_out = newinfo.tag_out;
				if (IN6_IS_ADDR_LINKLOCAL(&newinfo.nexthop_out))
					aggregate->nexthop_out =
						newinfo.nexthop_out;
			}

			/* There is no redistribute routemap for the aggregated
			 * RTE */

			/* Changed route only output. */
			/* XXX, vincent, in order to increase time convergence,
			 * it should be announced if a child has changed.
			 */
			if (route_type == ripng_changed_route)
				continue;

			/* Apply offset-list */
			if (aggregate->metric_out != RIPNG_METRIC_INFINITY)
				ripng_offset_list_apply_out(
					ripng, p, ifp, &aggregate->metric_out);

			if (aggregate->metric_out > RIPNG_METRIC_INFINITY)
				aggregate->metric_out = RIPNG_METRIC_INFINITY;

			/* Add RTE to the list */
			ripng_rte_add(ripng_rte_list, p, NULL, aggregate);
		}
	}

	/* Flush the list */
	ripng_rte_send(ripng_rte_list, ifp, to);
	ripng_rte_free(ripng_rte_list);
}

struct ripng *ripng_lookup_by_vrf_id(vrf_id_t vrf_id)
{
	struct vrf *vrf;

	vrf = vrf_lookup_by_id(vrf_id);
	if (!vrf)
		return NULL;

	return vrf->info;
}

struct ripng *ripng_lookup_by_vrf_name(const char *vrf_name)
{
	struct ripng ripng;

	ripng.vrf_name = (char *)vrf_name;

	return RB_FIND(ripng_instance_head, &ripng_instances, &ripng);
}

/* Create new RIPng instance and set it to global variable. */
struct ripng *ripng_create(const char *vrf_name, struct vrf *vrf, int socket)
{
	struct ripng *ripng;

	/* Allocaste RIPng instance. */
	ripng = XCALLOC(MTYPE_RIPNG, sizeof(struct ripng));
	ripng->vrf_name = XSTRDUP(MTYPE_RIPNG_VRF_NAME, vrf_name);

	/* Default version and timer values. */
	ripng->version = RIPNG_V1;
	ripng->update_time = yang_get_default_uint32(
		"%s/timers/update-interval", RIPNG_INSTANCE);
	ripng->timeout_time = yang_get_default_uint32(
		"%s/timers/holddown-interval", RIPNG_INSTANCE);
	ripng->garbage_time = yang_get_default_uint32(
		"%s/timers/flush-interval", RIPNG_INSTANCE);
	ripng->default_metric =
		yang_get_default_uint8("%s/default-metric", RIPNG_INSTANCE);
	ripng->ecmp = yang_get_default_bool("%s/allow-ecmp", RIPNG_INSTANCE);

	/* Make buffer.  */
	ripng->ibuf = stream_new(RIPNG_MAX_PACKET_SIZE * 5);
	ripng->obuf = stream_new(RIPNG_MAX_PACKET_SIZE);

	/* Initialize RIPng data structures. */
	ripng->table = agg_table_init();
	agg_set_table_info(ripng->table, ripng);
	ripng->peer_list = list_new();
	ripng->peer_list->cmp = (int (*)(void *, void *))ripng_peer_list_cmp;
	ripng->peer_list->del = ripng_peer_list_del;
	ripng->enable_if = vector_init(1);
	ripng->enable_network = agg_table_init();
	ripng->passive_interface = vector_init(1);
	ripng->offset_list_master = list_new();
	ripng->offset_list_master->cmp =
		(int (*)(void *, void *))offset_list_cmp;
	ripng->offset_list_master->del =
		(void (*)(void *))ripng_offset_list_free;
	ripng->distribute_ctx = distribute_list_ctx_create(vrf);
	distribute_list_add_hook(ripng->distribute_ctx,
				 ripng_distribute_update);
	distribute_list_delete_hook(ripng->distribute_ctx,
				    ripng_distribute_update);

	/* if rmap install. */
	ripng->if_rmap_ctx = if_rmap_ctx_create(vrf_name);
	if_rmap_hook_add(ripng->if_rmap_ctx, ripng_if_rmap_update);
	if_rmap_hook_delete(ripng->if_rmap_ctx, ripng_if_rmap_update);

	/* Enable the routing instance if possible. */
	if (vrf && vrf_is_enabled(vrf))
		ripng_instance_enable(ripng, vrf, socket);
	else {
		ripng->vrf = NULL;
		ripng->sock = -1;
	}

	RB_INSERT(ripng_instance_head, &ripng_instances, ripng);

	return ripng;
}

/* Send RIPng request to the interface. */
int ripng_request(struct interface *ifp)
{
	struct rte *rte;
	struct ripng_packet ripng_packet;

	/* In default ripd doesn't send RIP_REQUEST to the loopback interface.
	 */
	if (if_is_loopback(ifp))
		return 0;

	/* If interface is down, don't send RIP packet. */
	if (!if_is_up(ifp))
		return 0;

	if (IS_RIPNG_DEBUG_EVENT)
		zlog_debug("RIPng send request to %s", ifp->name);

	memset(&ripng_packet, 0, sizeof(ripng_packet));
	ripng_packet.command = RIPNG_REQUEST;
	ripng_packet.version = RIPNG_V1;
	rte = ripng_packet.rte;
	rte->metric = RIPNG_METRIC_INFINITY;

	return ripng_send_packet((caddr_t)&ripng_packet, sizeof(ripng_packet),
				 NULL, ifp);
}


static int ripng_update_jitter(int time)
{
	return ((random() % (time + 1)) - (time / 2));
}

void ripng_event(struct ripng *ripng, enum ripng_event event, int sock)
{
	int jitter = 0;

	switch (event) {
	case RIPNG_READ:
		thread_add_read(master, ripng_read, ripng, sock,
				&ripng->t_read);
		break;
	case RIPNG_UPDATE_EVENT:
		if (ripng->t_update) {
			thread_cancel(ripng->t_update);
			ripng->t_update = NULL;
		}
		/* Update timer jitter. */
		jitter = ripng_update_jitter(ripng->update_time);

		ripng->t_update = NULL;
		thread_add_timer(master, ripng_update, ripng,
				 sock ? 2 : ripng->update_time + jitter,
				 &ripng->t_update);
		break;
	case RIPNG_TRIGGERED_UPDATE:
		if (ripng->t_triggered_interval)
			ripng->trigger = 1;
		else
			thread_add_event(master, ripng_triggered_update, ripng,
					 0, &ripng->t_triggered_update);
		break;
	default:
		break;
	}
}


/* Print out routes update time. */
static void ripng_vty_out_uptime(struct vty *vty, struct ripng_info *rinfo)
{
	time_t clock;
	struct tm *tm;
#define TIME_BUF 25
	char timebuf[TIME_BUF];
	struct thread *thread;

	if ((thread = rinfo->t_timeout) != NULL) {
		clock = thread_timer_remain_second(thread);
		tm = gmtime(&clock);
		strftime(timebuf, TIME_BUF, "%M:%S", tm);
		vty_out(vty, "%5s", timebuf);
	} else if ((thread = rinfo->t_garbage_collect) != NULL) {
		clock = thread_timer_remain_second(thread);
		tm = gmtime(&clock);
		strftime(timebuf, TIME_BUF, "%M:%S", tm);
		vty_out(vty, "%5s", timebuf);
	}
}

static char *ripng_route_subtype_print(struct ripng_info *rinfo)
{
	static char str[3];
	memset(str, 0, 3);

	if (rinfo->suppress)
		strlcat(str, "S", sizeof(str));

	switch (rinfo->sub_type) {
	case RIPNG_ROUTE_RTE:
		strlcat(str, "n", sizeof(str));
		break;
	case RIPNG_ROUTE_STATIC:
		strlcat(str, "s", sizeof(str));
		break;
	case RIPNG_ROUTE_DEFAULT:
		strlcat(str, "d", sizeof(str));
		break;
	case RIPNG_ROUTE_REDISTRIBUTE:
		strlcat(str, "r", sizeof(str));
		break;
	case RIPNG_ROUTE_INTERFACE:
		strlcat(str, "i", sizeof(str));
		break;
	default:
		strlcat(str, "?", sizeof(str));
		break;
	}

	return str;
}

DEFUN (show_ipv6_ripng,
       show_ipv6_ripng_cmd,
       "show ipv6 ripng [vrf NAME]",
       SHOW_STR
       IPV6_STR
       "Show RIPng routes\n"
       VRF_CMD_HELP_STR)
{
	struct ripng *ripng;
	struct agg_node *rp;
	struct ripng_info *rinfo;
	struct ripng_aggregate *aggregate;
	struct prefix_ipv6 *p;
	struct list *list = NULL;
	struct listnode *listnode = NULL;
	int len;
	const char *vrf_name;
	int idx = 0;

	if (argv_find(argv, argc, "vrf", &idx))
		vrf_name = argv[idx + 1]->arg;
	else
		vrf_name = VRF_DEFAULT_NAME;

	ripng = ripng_lookup_by_vrf_name(vrf_name);
	if (!ripng) {
		vty_out(vty, "%% RIPng instance not found\n");
		return CMD_SUCCESS;
	}
	if (!ripng->enabled) {
		vty_out(vty, "%% RIPng instance is disabled\n");
		return CMD_SUCCESS;
	}

	/* Header of display. */
	vty_out(vty,
		"Codes: R - RIPng, C - connected, S - Static, O - OSPF, B - BGP\n"
		"Sub-codes:\n"
		"      (n) - normal, (s) - static, (d) - default, (r) - redistribute,\n"
		"      (i) - interface, (a/S) - aggregated/Suppressed\n\n"
		"   Network      Next Hop                      Via     Metric Tag Time\n");

	for (rp = agg_route_top(ripng->table); rp; rp = agg_route_next(rp)) {
		if ((aggregate = rp->aggregate) != NULL) {
			p = (struct prefix_ipv6 *)&rp->p;

#ifdef DEBUG
			vty_out(vty, "R(a) %d/%d %s/%d ", aggregate->count,
				aggregate->suppress, inet6_ntoa(p->prefix),
				p->prefixlen);
#else
			vty_out(vty, "R(a) %s/%d ", inet6_ntoa(p->prefix),
				p->prefixlen);
#endif /* DEBUG */
			vty_out(vty, "\n");
			vty_out(vty, "%*s", 18, " ");

			vty_out(vty, "%*s", 28, " ");
			vty_out(vty, "self      %2d  %3" ROUTE_TAG_PRI "\n",
				aggregate->metric, (route_tag_t)aggregate->tag);
		}

		if ((list = rp->info) != NULL)
			for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) {
				p = (struct prefix_ipv6 *)&rp->p;

#ifdef DEBUG
				vty_out(vty, "%c(%s) 0/%d %s/%d ",
					zebra_route_char(rinfo->type),
					ripng_route_subtype_print(rinfo),
					rinfo->suppress, inet6_ntoa(p->prefix),
					p->prefixlen);
#else
				vty_out(vty, "%c(%s) %s/%d ",
					zebra_route_char(rinfo->type),
					ripng_route_subtype_print(rinfo),
					inet6_ntoa(p->prefix), p->prefixlen);
#endif /* DEBUG */
				vty_out(vty, "\n");
				vty_out(vty, "%*s", 18, " ");
				len = vty_out(vty, "%s",
					      inet6_ntoa(rinfo->nexthop));

				len = 28 - len;
				if (len > 0)
					vty_out(vty, "%*s", len, " ");

				/* from */
				if ((rinfo->type == ZEBRA_ROUTE_RIPNG)
				    && (rinfo->sub_type == RIPNG_ROUTE_RTE)) {
					len = vty_out(
						vty, "%s",
						ifindex2ifname(
							rinfo->ifindex,
							ripng->vrf->vrf_id));
				} else if (rinfo->metric
					   == RIPNG_METRIC_INFINITY) {
					len = vty_out(vty, "kill");
				} else
					len = vty_out(vty, "self");

				len = 9 - len;
				if (len > 0)
					vty_out(vty, "%*s", len, " ");

				vty_out(vty, " %2d  %3" ROUTE_TAG_PRI "  ",
					rinfo->metric, (route_tag_t)rinfo->tag);

				/* time */
				if ((rinfo->type == ZEBRA_ROUTE_RIPNG)
				    && (rinfo->sub_type == RIPNG_ROUTE_RTE)) {
					/* RTE from remote RIP routers */
					ripng_vty_out_uptime(vty, rinfo);
				} else if (rinfo->metric
					   == RIPNG_METRIC_INFINITY) {
					/* poisonous reversed routes (gc) */
					ripng_vty_out_uptime(vty, rinfo);
				}

				vty_out(vty, "\n");
			}
	}

	return CMD_SUCCESS;
}

DEFUN (show_ipv6_ripng_status,
       show_ipv6_ripng_status_cmd,
       "show ipv6 ripng [vrf NAME] status",
       SHOW_STR
       IPV6_STR
       "Show RIPng routes\n"
       VRF_CMD_HELP_STR
       "IPv6 routing protocol process parameters and statistics\n")
{
	struct ripng *ripng;
	struct interface *ifp;
	const char *vrf_name;
	int idx = 0;

	if (argv_find(argv, argc, "vrf", &idx))
		vrf_name = argv[idx + 1]->arg;
	else
		vrf_name = VRF_DEFAULT_NAME;

	ripng = ripng_lookup_by_vrf_name(vrf_name);
	if (!ripng) {
		vty_out(vty, "%% RIPng instance not found\n");
		return CMD_SUCCESS;
	}
	if (!ripng->enabled) {
		vty_out(vty, "%% RIPng instance is disabled\n");
		return CMD_SUCCESS;
	}

	vty_out(vty, "Routing Protocol is \"RIPng\"\n");
	vty_out(vty, "  Sending updates every %u seconds with +/-50%%,",
		ripng->update_time);
	vty_out(vty, " next due in %lu seconds\n",
		thread_timer_remain_second(ripng->t_update));
	vty_out(vty, "  Timeout after %u seconds,", ripng->timeout_time);
	vty_out(vty, " garbage collect after %u seconds\n",
		ripng->garbage_time);

	/* Filtering status show. */
	config_show_distribute(vty, ripng->distribute_ctx);

	/* Default metric information. */
	vty_out(vty, "  Default redistribution metric is %d\n",
		ripng->default_metric);

	/* Redistribute information. */
	vty_out(vty, "  Redistributing:");
	ripng_redistribute_write(vty, ripng);
	vty_out(vty, "\n");

	vty_out(vty, "  Default version control: send version %d,",
		ripng->version);
	vty_out(vty, " receive version %d \n", ripng->version);

	vty_out(vty, "    Interface        Send  Recv\n");

	FOR_ALL_INTERFACES (ripng->vrf, ifp) {
		struct ripng_interface *ri;

		ri = ifp->info;

		if (ri->enable_network || ri->enable_interface) {

			vty_out(vty, "    %-17s%-3d   %-3d\n", ifp->name,
				ripng->version, ripng->version);
		}
	}

	vty_out(vty, "  Routing for Networks:\n");
	ripng_network_write(vty, ripng);

	vty_out(vty, "  Routing Information Sources:\n");
	vty_out(vty,
		"    Gateway          BadPackets BadRoutes  Distance Last Update\n");
	ripng_peer_display(vty, ripng);

	return CMD_SUCCESS;
}

#if 0
/* RIPng update timer setup. */
DEFUN (ripng_update_timer,
       ripng_update_timer_cmd,
       "update-timer SECOND",
       "Set RIPng update timer in seconds\n"
       "Seconds\n")
{
  unsigned long update;
  char *endptr = NULL;

  update = strtoul (argv[0], &endptr, 10);
  if (update == ULONG_MAX || *endptr != '\0')
    {
      vty_out (vty, "update timer value error\n");
      return CMD_WARNING_CONFIG_FAILED;
    }

  ripng->update_time = update;

  ripng_event (RIPNG_UPDATE_EVENT, 0);
  return CMD_SUCCESS;
}

DEFUN (no_ripng_update_timer,
       no_ripng_update_timer_cmd,
       "no update-timer SECOND",
       NO_STR
       "Unset RIPng update timer in seconds\n"
       "Seconds\n")
{
  ripng->update_time = RIPNG_UPDATE_TIMER_DEFAULT;
  ripng_event (RIPNG_UPDATE_EVENT, 0);
  return CMD_SUCCESS;
}

/* RIPng timeout timer setup. */
DEFUN (ripng_timeout_timer,
       ripng_timeout_timer_cmd,
       "timeout-timer SECOND",
       "Set RIPng timeout timer in seconds\n"
       "Seconds\n")
{
  unsigned long timeout;
  char *endptr = NULL;

  timeout = strtoul (argv[0], &endptr, 10);
  if (timeout == ULONG_MAX || *endptr != '\0')
    {
      vty_out (vty, "timeout timer value error\n");
      return CMD_WARNING_CONFIG_FAILED;
    }

  ripng->timeout_time = timeout;

  return CMD_SUCCESS;
}

DEFUN (no_ripng_timeout_timer,
       no_ripng_timeout_timer_cmd,
       "no timeout-timer SECOND",
       NO_STR
       "Unset RIPng timeout timer in seconds\n"
       "Seconds\n")
{
  ripng->timeout_time = RIPNG_TIMEOUT_TIMER_DEFAULT;
  return CMD_SUCCESS;
}

/* RIPng garbage timer setup. */
DEFUN (ripng_garbage_timer,
       ripng_garbage_timer_cmd,
       "garbage-timer SECOND",
       "Set RIPng garbage timer in seconds\n"
       "Seconds\n")
{
  unsigned long garbage;
  char *endptr = NULL;

  garbage = strtoul (argv[0], &endptr, 10);
  if (garbage == ULONG_MAX || *endptr != '\0')
    {
      vty_out (vty, "garbage timer value error\n");
      return CMD_WARNING_CONFIG_FAILED;
    }

  ripng->garbage_time = garbage;

  return CMD_SUCCESS;
}

DEFUN (no_ripng_garbage_timer,
       no_ripng_garbage_timer_cmd,
       "no garbage-timer SECOND",
       NO_STR
       "Unset RIPng garbage timer in seconds\n"
       "Seconds\n")
{
  ripng->garbage_time = RIPNG_GARBAGE_TIMER_DEFAULT;
  return CMD_SUCCESS;
}
#endif /* 0 */

#if 0
DEFUN (show_ipv6_protocols,
       show_ipv6_protocols_cmd,
       "show ipv6 protocols",
       SHOW_STR
       IPV6_STR
       "Routing protocol information\n")
{
  if (! ripng)
    return CMD_SUCCESS;

  vty_out (vty, "Routing Protocol is \"ripng\"\n");
  
  vty_out (vty, "Sending updates every %ld seconds, next due in %d seconds\n",
	   ripng->update_time, 0);

  vty_out (vty, "Timerout after %ld seconds, garbage correct %ld\n",
	   ripng->timeout_time,
	   ripng->garbage_time);

  vty_out (vty, "Outgoing update filter list for all interfaces is not set");
  vty_out (vty, "Incoming update filter list for all interfaces is not set");

  return CMD_SUCCESS;
}
#endif

/* Update ECMP routes to zebra when ECMP is disabled. */
void ripng_ecmp_disable(struct ripng *ripng)
{
	struct agg_node *rp;
	struct ripng_info *rinfo, *tmp_rinfo;
	struct list *list;
	struct listnode *node, *nextnode;

	if (!ripng)
		return;

	for (rp = agg_route_top(ripng->table); rp; rp = agg_route_next(rp))
		if ((list = rp->info) != NULL && listcount(list) > 1) {
			rinfo = listgetdata(listhead(list));
			if (!ripng_route_rte(rinfo))
				continue;

			/* Drop all other entries, except the first one. */
			for (ALL_LIST_ELEMENTS(list, node, nextnode, tmp_rinfo))
				if (tmp_rinfo != rinfo) {
					RIPNG_TIMER_OFF(tmp_rinfo->t_timeout);
					RIPNG_TIMER_OFF(
						tmp_rinfo->t_garbage_collect);
					list_delete_node(list, node);
					ripng_info_free(tmp_rinfo);
				}

			/* Update zebra. */
			ripng_zebra_ipv6_add(ripng, rp);

			/* Set the route change flag. */
			SET_FLAG(rinfo->flags, RIPNG_RTF_CHANGED);

			/* Signal the output process to trigger an update. */
			ripng_event(ripng, RIPNG_TRIGGERED_UPDATE, 0);
		}
}

/* RIPng configuration write function. */
static int ripng_config_write(struct vty *vty)
{
	struct ripng *ripng;
	int write = 0;

	RB_FOREACH(ripng, ripng_instance_head, &ripng_instances) {
		char xpath[XPATH_MAXLEN];
		struct lyd_node *dnode;

		snprintf(xpath, sizeof(xpath),
			 "/frr-ripngd:ripngd/instance[vrf='%s']",
			 ripng->vrf_name);

		dnode = yang_dnode_get(running_config->dnode, xpath);
		assert(dnode);

		nb_cli_show_dnode_cmds(vty, dnode, false);

		config_write_distribute(vty, ripng->distribute_ctx);
		config_write_if_rmap(vty, ripng->if_rmap_ctx);

		write = 1;
	}

	return write;
}

/* RIPng node structure. */
static struct cmd_node cmd_ripng_node = {
	RIPNG_NODE, "%s(config-router)# ", 1,
};

static void ripng_distribute_update(struct distribute_ctx *ctx,
				    struct distribute *dist)
{
	struct interface *ifp;
	struct ripng_interface *ri;
	struct access_list *alist;
	struct prefix_list *plist;

	if (!ctx->vrf || !dist->ifname)
		return;

	ifp = if_lookup_by_name(dist->ifname, ctx->vrf->vrf_id);
	if (ifp == NULL)
		return;

	ri = ifp->info;

	if (dist->list[DISTRIBUTE_V6_IN]) {
		alist = access_list_lookup(AFI_IP6,
					   dist->list[DISTRIBUTE_V6_IN]);
		if (alist)
			ri->list[RIPNG_FILTER_IN] = alist;
		else
			ri->list[RIPNG_FILTER_IN] = NULL;
	} else
		ri->list[RIPNG_FILTER_IN] = NULL;

	if (dist->list[DISTRIBUTE_V6_OUT]) {
		alist = access_list_lookup(AFI_IP6,
					   dist->list[DISTRIBUTE_V6_OUT]);
		if (alist)
			ri->list[RIPNG_FILTER_OUT] = alist;
		else
			ri->list[RIPNG_FILTER_OUT] = NULL;
	} else
		ri->list[RIPNG_FILTER_OUT] = NULL;

	if (dist->prefix[DISTRIBUTE_V6_IN]) {
		plist = prefix_list_lookup(AFI_IP6,
					   dist->prefix[DISTRIBUTE_V6_IN]);
		if (plist)
			ri->prefix[RIPNG_FILTER_IN] = plist;
		else
			ri->prefix[RIPNG_FILTER_IN] = NULL;
	} else
		ri->prefix[RIPNG_FILTER_IN] = NULL;

	if (dist->prefix[DISTRIBUTE_V6_OUT]) {
		plist = prefix_list_lookup(AFI_IP6,
					   dist->prefix[DISTRIBUTE_V6_OUT]);
		if (plist)
			ri->prefix[RIPNG_FILTER_OUT] = plist;
		else
			ri->prefix[RIPNG_FILTER_OUT] = NULL;
	} else
		ri->prefix[RIPNG_FILTER_OUT] = NULL;
}

void ripng_distribute_update_interface(struct interface *ifp)
{
	struct ripng_interface *ri = ifp->info;
	struct ripng *ripng = ri->ripng;
	struct distribute *dist;

	if (!ripng)
		return;
	dist = distribute_lookup(ripng->distribute_ctx, ifp->name);
	if (dist)
		ripng_distribute_update(ripng->distribute_ctx, dist);
}

/* Update all interface's distribute list. */
static void ripng_distribute_update_all(struct prefix_list *notused)
{
	struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT);
	struct interface *ifp;

	FOR_ALL_INTERFACES (vrf, ifp)
		ripng_distribute_update_interface(ifp);
}

static void ripng_distribute_update_all_wrapper(struct access_list *notused)
{
	ripng_distribute_update_all(NULL);
}

/* delete all the added ripng routes. */
void ripng_clean(struct ripng *ripng)
{
	if (ripng->enabled)
		ripng_instance_disable(ripng);

	for (int i = 0; i < ZEBRA_ROUTE_MAX; i++)
		if (ripng->redist[i].route_map.name)
			free(ripng->redist[i].route_map.name);

	agg_table_finish(ripng->table);
	list_delete(&ripng->peer_list);
	distribute_list_delete(&ripng->distribute_ctx);
	if_rmap_ctx_delete(ripng->if_rmap_ctx);

	stream_free(ripng->ibuf);
	stream_free(ripng->obuf);

	ripng_clean_network(ripng);
	ripng_passive_interface_clean(ripng);
	vector_free(ripng->enable_if);
	agg_table_finish(ripng->enable_network);
	vector_free(ripng->passive_interface);
	list_delete(&ripng->offset_list_master);
	ripng_interface_clean(ripng);

	RB_REMOVE(ripng_instance_head, &ripng_instances, ripng);
	XFREE(MTYPE_RIPNG_VRF_NAME, ripng->vrf_name);
	XFREE(MTYPE_RIPNG, ripng);
}

static void ripng_if_rmap_update(struct if_rmap_ctx *ctx,
				 struct if_rmap *if_rmap)
{
	struct interface *ifp = NULL;
	struct ripng_interface *ri;
	struct route_map *rmap;
	struct vrf *vrf = NULL;

	if (ctx->name)
		vrf = vrf_lookup_by_name(ctx->name);
	if (vrf)
		ifp = if_lookup_by_name(if_rmap->ifname, vrf->vrf_id);
	if (ifp == NULL)
		return;

	ri = ifp->info;

	if (if_rmap->routemap[IF_RMAP_IN]) {
		rmap = route_map_lookup_by_name(if_rmap->routemap[IF_RMAP_IN]);
		if (rmap)
			ri->routemap[IF_RMAP_IN] = rmap;
		else
			ri->routemap[IF_RMAP_IN] = NULL;
	} else
		ri->routemap[RIPNG_FILTER_IN] = NULL;

	if (if_rmap->routemap[IF_RMAP_OUT]) {
		rmap = route_map_lookup_by_name(if_rmap->routemap[IF_RMAP_OUT]);
		if (rmap)
			ri->routemap[IF_RMAP_OUT] = rmap;
		else
			ri->routemap[IF_RMAP_OUT] = NULL;
	} else
		ri->routemap[RIPNG_FILTER_OUT] = NULL;
}

void ripng_if_rmap_update_interface(struct interface *ifp)
{
	struct ripng_interface *ri = ifp->info;
	struct ripng *ripng = ri->ripng;
	struct if_rmap *if_rmap;
	struct if_rmap_ctx *ctx;

	if (!ripng)
		return;
	ctx = ripng->if_rmap_ctx;
	if (!ctx)
		return;
	if_rmap = if_rmap_lookup(ctx, ifp->name);
	if (if_rmap)
		ripng_if_rmap_update(ctx, if_rmap);
}

static void ripng_routemap_update_redistribute(struct ripng *ripng)
{
	for (int i = 0; i < ZEBRA_ROUTE_MAX; i++) {
		if (ripng->redist[i].route_map.name) {
			ripng->redist[i].route_map.map =
				route_map_lookup_by_name(
					ripng->redist[i].route_map.name);
			route_map_counter_increment(
				ripng->redist[i].route_map.map);
		}
	}
}

static void ripng_routemap_update(const char *unused)
{
	struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT);
	struct ripng *ripng;
	struct interface *ifp;

	FOR_ALL_INTERFACES (vrf, ifp)
		ripng_if_rmap_update_interface(ifp);

	ripng = vrf->info;
	if (ripng)
		ripng_routemap_update_redistribute(ripng);
}

/* Link RIPng instance to VRF. */
static void ripng_vrf_link(struct ripng *ripng, struct vrf *vrf)
{
	struct interface *ifp;

	ripng->vrf = vrf;
	ripng->distribute_ctx->vrf = vrf;
	vrf->info = ripng;

	FOR_ALL_INTERFACES (vrf, ifp)
		ripng_interface_sync(ifp);
}

/* Unlink RIPng instance from VRF. */
static void ripng_vrf_unlink(struct ripng *ripng, struct vrf *vrf)
{
	struct interface *ifp;

	ripng->vrf = NULL;
	ripng->distribute_ctx->vrf = NULL;
	vrf->info = NULL;

	FOR_ALL_INTERFACES (vrf, ifp)
		ripng_interface_sync(ifp);
}

static void ripng_instance_enable(struct ripng *ripng, struct vrf *vrf,
				  int sock)
{
	ripng->sock = sock;

	ripng_vrf_link(ripng, vrf);
	ripng->enabled = true;

	/* Resend all redistribute requests. */
	ripng_redistribute_enable(ripng);

	/* Create read and timer thread. */
	ripng_event(ripng, RIPNG_READ, ripng->sock);
	ripng_event(ripng, RIPNG_UPDATE_EVENT, 1);

	ripng_zebra_vrf_register(vrf);
}

static void ripng_instance_disable(struct ripng *ripng)
{
	struct vrf *vrf = ripng->vrf;
	struct agg_node *rp;

	/* Clear RIPng routes */
	for (rp = agg_route_top(ripng->table); rp; rp = agg_route_next(rp)) {
		struct ripng_aggregate *aggregate;
		struct list *list;

		if ((list = rp->info) != NULL) {
			struct ripng_info *rinfo;
			struct listnode *listnode;

			rinfo = listgetdata(listhead(list));
			if (ripng_route_rte(rinfo))
				ripng_zebra_ipv6_delete(ripng, rp);

			for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) {
				RIPNG_TIMER_OFF(rinfo->t_timeout);
				RIPNG_TIMER_OFF(rinfo->t_garbage_collect);
				ripng_info_free(rinfo);
			}
			list_delete(&list);
			rp->info = NULL;
			agg_unlock_node(rp);
		}

		if ((aggregate = rp->aggregate) != NULL) {
			ripng_aggregate_free(aggregate);
			rp->aggregate = NULL;
			agg_unlock_node(rp);
		}
	}

	/* Flush all redistribute requests. */
	ripng_redistribute_disable(ripng);

	/* Cancel the RIPng timers */
	RIPNG_TIMER_OFF(ripng->t_update);
	RIPNG_TIMER_OFF(ripng->t_triggered_update);
	RIPNG_TIMER_OFF(ripng->t_triggered_interval);

	/* Cancel the read thread */
	if (ripng->t_read) {
		thread_cancel(ripng->t_read);
		ripng->t_read = NULL;
	}

	/* Close the RIPng socket */
	if (ripng->sock >= 0) {
		close(ripng->sock);
		ripng->sock = -1;
	}

	/* Clear existing peers. */
	list_delete_all_node(ripng->peer_list);

	ripng_zebra_vrf_deregister(vrf);

	ripng_vrf_unlink(ripng, vrf);
	ripng->enabled = false;
}

static int ripng_vrf_new(struct vrf *vrf)
{
	if (IS_RIPNG_DEBUG_EVENT)
		zlog_debug("%s: VRF created: %s(%u)", __func__, vrf->name,
			   vrf->vrf_id);

	return 0;
}

static int ripng_vrf_delete(struct vrf *vrf)
{
	if (IS_RIPNG_DEBUG_EVENT)
		zlog_debug("%s: VRF deleted: %s(%u)", __func__, vrf->name,
			   vrf->vrf_id);

	return 0;
}

static int ripng_vrf_enable(struct vrf *vrf)
{
	struct ripng *ripng;
	int socket;

	ripng = ripng_lookup_by_vrf_name(vrf->name);
	if (!ripng) {
		char *old_vrf_name = NULL;

		ripng = (struct ripng *)vrf->info;
		if (!ripng)
			return 0;
		/* update vrf name */
		if (ripng->vrf_name)
			old_vrf_name = ripng->vrf_name;
		ripng->vrf_name = XSTRDUP(MTYPE_RIPNG_VRF_NAME, vrf->name);
		/*
		 * HACK: Change the RIPng VRF in the running configuration directly,
		 * bypassing the northbound layer. This is necessary to avoid deleting
		 * the RIPng and readding it in the new VRF, which would have
		 * several implications.
		 */
		if (yang_module_find("frr-ripngd") && old_vrf_name) {
			struct lyd_node *ripng_dnode;

			pthread_rwlock_wrlock(&running_config->lock);
			{
				ripng_dnode = yang_dnode_get(
						   running_config->dnode,
						   "/frr-ripngd:ripngd/instance[vrf='%s']/vrf",
						   old_vrf_name);
				if (ripng_dnode) {
					yang_dnode_change_leaf(ripng_dnode, vrf->name);
					running_config->version++;
				}
			}
			pthread_rwlock_unlock(&running_config->lock);
		}
		if (old_vrf_name)
			XFREE(MTYPE_RIPNG_VRF_NAME, old_vrf_name);
	}

	if (ripng->enabled)
		return 0;

	if (IS_RIPNG_DEBUG_EVENT)
		zlog_debug("%s: VRF %s(%u) enabled", __func__, vrf->name,
			   vrf->vrf_id);

	/* Activate the VRF RIPng instance. */
	socket = ripng_make_socket(vrf);
	if (socket < 0)
		return -1;

	ripng_instance_enable(ripng, vrf, socket);

	return 0;
}

static int ripng_vrf_disable(struct vrf *vrf)
{
	struct ripng *ripng;

	ripng = ripng_lookup_by_vrf_name(vrf->name);
	if (!ripng || !ripng->enabled)
		return 0;

	if (IS_RIPNG_DEBUG_EVENT)
		zlog_debug("%s: VRF %s(%u) disabled", __func__, vrf->name,
			   vrf->vrf_id);

	/* Deactivate the VRF RIPng instance. */
	if (ripng->enabled)
		ripng_instance_disable(ripng);

	return 0;
}

void ripng_vrf_init(void)
{
	vrf_init(ripng_vrf_new, ripng_vrf_enable, ripng_vrf_disable,
		 ripng_vrf_delete, ripng_vrf_enable);
}

void ripng_vrf_terminate(void)
{
	vrf_terminate();
}

/* Initialize ripng structure and set commands. */
void ripng_init(void)
{
	/* Install RIPNG_NODE. */
	install_node(&cmd_ripng_node, ripng_config_write);

	/* Install ripng commands. */
	install_element(VIEW_NODE, &show_ipv6_ripng_cmd);
	install_element(VIEW_NODE, &show_ipv6_ripng_status_cmd);

	install_default(RIPNG_NODE);

#if 0
  install_element (VIEW_NODE, &show_ipv6_protocols_cmd);
  install_element (RIPNG_NODE, &ripng_update_timer_cmd);
  install_element (RIPNG_NODE, &no_ripng_update_timer_cmd);
  install_element (RIPNG_NODE, &ripng_timeout_timer_cmd);
  install_element (RIPNG_NODE, &no_ripng_timeout_timer_cmd);
  install_element (RIPNG_NODE, &ripng_garbage_timer_cmd);
  install_element (RIPNG_NODE, &no_ripng_garbage_timer_cmd);
#endif /* 0 */

	ripng_if_init();
	ripng_debug_init();

	/* Access list install. */
	access_list_init();
	access_list_add_hook(ripng_distribute_update_all_wrapper);
	access_list_delete_hook(ripng_distribute_update_all_wrapper);

	/* Prefix list initialize.*/
	prefix_list_init();
	prefix_list_add_hook(ripng_distribute_update_all);
	prefix_list_delete_hook(ripng_distribute_update_all);

	/* Distribute list install. */
	distribute_list_init(RIPNG_NODE);

	/* Route-map for interface. */
	ripng_route_map_init();

	route_map_add_hook(ripng_routemap_update);
	route_map_delete_hook(ripng_routemap_update);

	if_rmap_init(RIPNG_NODE);
}