summaryrefslogtreecommitdiffstats
path: root/vrrpd/vrrp.c
blob: b14a6ecc473f6559e309dd1858ec87350260ebcc (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * VRRP global definitions and state machine.
 * Copyright (C) 2018-2019 Cumulus Networks, Inc.
 * Quentin Young
 */
#include <zebra.h>

#include "lib/hash.h"
#include "lib/hook.h"
#include "lib/if.h"
#include "lib/linklist.h"
#include "lib/memory.h"
#include "lib/network.h"
#include "lib/prefix.h"
#include "lib/sockopt.h"
#include "lib/sockunion.h"
#include "lib/vrf.h"
#include "lib/vty.h"

#include "vrrp.h"
#include "vrrp_arp.h"
#include "vrrp_debug.h"
#include "vrrp_ndisc.h"
#include "vrrp_packet.h"
#include "vrrp_zebra.h"

#define VRRP_LOGPFX "[CORE] "

DEFINE_MTYPE_STATIC(VRRPD, VRRP_IP, "VRRP IP address");
DEFINE_MTYPE_STATIC(VRRPD, VRRP_RTR, "VRRP Router");

/* statics */
struct hash *vrrp_vrouters_hash;
bool vrrp_autoconfig_is_on;
int vrrp_autoconfig_version;

struct vrrp_defaults vd;

const char *const vrrp_state_names[3] = {
	[VRRP_STATE_INITIALIZE] = "Initialize",
	[VRRP_STATE_MASTER] = "Master",
	[VRRP_STATE_BACKUP] = "Backup",
};

static const char *const vrrp_event_names[2] = {
	[VRRP_EVENT_STARTUP] = "Startup",
	[VRRP_EVENT_SHUTDOWN] = "Shutdown",
};


/* Utility functions ------------------------------------------------------- */

/*
 * Sets an ethaddr to RFC-defined Virtual Router MAC address.
 *
 * mac
 *    ethaddr to set
 *
 * v6
 *    Whether this is a V6 or V4 Virtual Router MAC
 *
 * vrid
 *    Virtual Router Identifier
 */
static void vrrp_mac_set(struct ethaddr *mac, bool v6, uint8_t vrid)
{
	/*
	 * V4: 00-00-5E-00-01-{VRID}
	 * V6: 00-00-5E-00-02-{VRID}
	 */
	mac->octet[0] = 0x00;
	mac->octet[1] = 0x00;
	mac->octet[2] = 0x5E;
	mac->octet[3] = 0x00;
	mac->octet[4] = v6 ? 0x02 : 0x01;
	mac->octet[5] = vrid;
}

/*
 * Recalculates and sets skew_time and master_down_interval based
 * values.
 *
 * r
 *   VRRP Router to operate on
 */
static void vrrp_recalculate_timers(struct vrrp_router *r)
{
	uint16_t mdiadv = r->vr->version == 3 ? r->master_adver_interval
					      : r->vr->advertisement_interval;
	uint16_t skm = (r->vr->version == 3) ? r->master_adver_interval : 100;

	r->skew_time = ((256 - r->vr->priority) * skm) / 256;
	r->master_down_interval = 3 * mdiadv;
	r->master_down_interval += r->skew_time;
}

/*
 * Determines if a VRRP router is the owner of the specified address.
 *
 * The determining factor for whether an interface is the address owner is
 * simply whether the address is assigned to the VRRP base interface by someone
 * other than vrrpd.
 *
 * This function should always return the correct answer regardless of
 * master/backup status.
 *
 * ifp
 *    The interface to check owernship of. This should be the base interface of
 *    a VRRP router.
 *
 * vr
 *    Virtual Router
 *
 * Returns:
 *    whether or not vr owns the specified address
 */
static bool vrrp_is_owner(struct interface *ifp, struct ipaddr *addr)
{
	/*
	 * This code sanity checks implicit ownership configuration. Ideally,
	 * the way we determine address ownership status for this VRRP router
	 * is by looking at whether our VIPs are also assigned to the base
	 * interface, and therefore count as "real" addresses. This frees the
	 * user from having to manually configure priority 255 to indicate
	 * address ownership. However, this means one of the VIPs will be used
	 * as the source address for VRRP advertisements, which in turn means
	 * that other VRRP routers will be receiving packets with a source
	 * address they themselves have. This causes lots of different issues
	 * so for now we're disabling this and forcing the user to configure
	 * priority 255 to indicate ownership.
	 */

	return false;

#if 0
	struct prefix p;

	p.family = IS_IPADDR_V4(addr) ? AF_INET : AF_INET6;
	p.prefixlen = IS_IPADDR_V4(addr) ? IPV4_MAX_BITLEN : IPV6_MAX_BITLEN;
	memcpy(&p.u, &addr->ip, sizeof(addr->ip));

	return !!connected_lookup_prefix_exact(ifp, &p);
#endif
}

/*
 * Whether an interface has a MAC address that matches the VRRP RFC.
 *
 * ifp
 *    Interface to check
 *
 * Returns:
 *    Whether the interface has a VRRP mac or not
 */
static bool vrrp_ifp_has_vrrp_mac(struct interface *ifp)
{
	struct ethaddr vmac4;
	struct ethaddr vmac6;

	vrrp_mac_set(&vmac4, 0, 0x00);
	vrrp_mac_set(&vmac6, 1, 0x00);

	return !memcmp(ifp->hw_addr, vmac4.octet, sizeof(vmac4.octet) - 1)
	       || !memcmp(ifp->hw_addr, vmac6.octet, sizeof(vmac6.octet) - 1);
}

/*
 * Lookup a Virtual Router instance given a macvlan subinterface.
 *
 * The VRID is extracted from the interface MAC and the 2-tuple (iface, vrid)
 * is used to look up any existing instances that match the interface. It does
 * not matter whether the instance is already bound to the interface or not.
 *
 * Note that the interface linkages must be correct for this to work. In other
 * words, the macvlan must have a valid VRRP MAC, and its link_ifindex must be
 * be equal to the ifindex of another interface in the interface RB trees (its
 * parent). If these conditions aren't satisfied we won't find the VR.
 *
 * mvl_ifp
 *    Interface pointer to use to lookup. Should be a macvlan device.
 *
 * Returns:
 *    Virtual Router, if found
 *    NULL otherwise
 */
static struct vrrp_vrouter *vrrp_lookup_by_if_mvl(struct interface *mvl_ifp)
{
	struct interface *p;

	if (!mvl_ifp || mvl_ifp->link_ifindex == 0
	    || !vrrp_ifp_has_vrrp_mac(mvl_ifp)) {
		if (mvl_ifp && mvl_ifp->link_ifindex == 0)
			DEBUGD(&vrrp_dbg_zebra,
			       VRRP_LOGPFX
			       "Interface %s has no parent ifindex; disregarding",
			       mvl_ifp->name);
		if (mvl_ifp && !vrrp_ifp_has_vrrp_mac(mvl_ifp))
			DEBUGD(&vrrp_dbg_zebra,
			       VRRP_LOGPFX
			       "Interface %s has a non-VRRP MAC; disregarding",
			       mvl_ifp->name);
		return NULL;
	}

	p = if_lookup_by_index(mvl_ifp->link_ifindex, mvl_ifp->vrf->vrf_id);

	if (!p) {
		DEBUGD(&vrrp_dbg_zebra,
		       VRRP_LOGPFX
		       "Tried to lookup interface %d, parent of %s, but it doesn't exist",
		       mvl_ifp->link_ifindex, mvl_ifp->name);
		return NULL;
	}

	uint8_t vrid = mvl_ifp->hw_addr[5];

	return vrrp_lookup(p, vrid);
}

/*
 * Lookup the Virtual Router instances configured on a particular interface.
 *
 * ifp
 *    Interface pointer to use to lookup. Should not be a macvlan device.
 *
 * Returns:
 *    List of virtual routers found
 */
static struct list *vrrp_lookup_by_if(struct interface *ifp)
{
	struct list *l = hash_to_list(vrrp_vrouters_hash);
	struct listnode *ln, *nn;
	struct vrrp_vrouter *vr;

	for (ALL_LIST_ELEMENTS(l, ln, nn, vr))
		if (vr->ifp != ifp)
			list_delete_node(l, ln);

	return l;
}

/*
 * Lookup any Virtual Router instances associated with a particular interface.
 * This is a combination of the results from vrrp_lookup_by_if_mvl and
 * vrrp_lookup_by_if.
 *
 * Suppose the system interface list looks like the following:
 *
 * eth0
 * \- eth0-v0 00:00:5e:00:01:01
 * \- eth0-v1 00:00:5e:00:02:01
 * \- eth0-v2 00:00:5e:00:01:0a
 *
 * Passing eth0-v2 to this function will give you the VRRP instance configured
 * on eth0 with VRID 10. Passing eth0-v0 or eth0-v1 will give you the VRRP
 * instance configured on eth0 with VRID 1. Passing eth0 will give you both.
 *
 * ifp
 *    Interface pointer to use to lookup. Can be any interface.
 *
 * Returns:
 *    List of virtual routers found
 */
static struct list *vrrp_lookup_by_if_any(struct interface *ifp)
{
	struct vrrp_vrouter *vr;
	struct list *vrs;

	vr = vrrp_lookup_by_if_mvl(ifp);
	vrs = vr ? list_new() : vrrp_lookup_by_if(ifp);

	if (vr)
		listnode_add(vrs, vr);

	return vrs;
}

/* Configuration controllers ----------------------------------------------- */

void vrrp_check_start(struct vrrp_vrouter *vr)
{
	struct vrrp_router *r;
	bool start;
	const char *whynot = NULL;

	if (vr->shutdown || vr->ifp == NULL)
		return;

	r = vr->v4;
	/* Must not already be started */
	start = r->fsm.state == VRRP_STATE_INITIALIZE;
	whynot = (!start && !whynot) ? "Already running" : whynot;
	/* Must have a parent interface */
	start = start && (vr->ifp != NULL);
	whynot = (!start && !whynot) ? "No base interface" : whynot;
#if 0
	/* Parent interface must be up */
	start = start && if_is_operative(vr->ifp);
	start = (!start && !whynot) ? "Base interface inoperative" : whynot;
#endif
	/* Parent interface must have at least one v4 */
	start = start && connected_count_by_family(vr->ifp, AF_INET) > 0;
	whynot = (!start && !whynot) ? "No primary IPv4 address" : whynot;
	/* Must have a macvlan interface */
	start = start && (r->mvl_ifp != NULL);
	whynot = (!start && !whynot) ? "No VRRP interface" : whynot;
#if 0
	/* Macvlan interface must be admin up */
	start = start && CHECK_FLAG(r->mvl_ifp->flags, IFF_UP);
	start = (!start && !whynot) ? "Macvlan device admin down" : whynot;
#endif
	/* Must have at least one VIP configured */
	start = start && r->addrs->count > 0;
	whynot = (!start && !whynot) ? "No Virtual IP address configured"
				     : whynot;
	if (start)
		vrrp_event(r, VRRP_EVENT_STARTUP);
	else if (whynot)
		zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
			  "Refusing to start Virtual Router: %s",
			  vr->vrid, family2str(r->family), whynot);

	whynot = NULL;

	r = vr->v6;
	/* Must not already be started */
	start = r->fsm.state == VRRP_STATE_INITIALIZE;
	whynot = (!start && !whynot) ? "Already running" : whynot;
	/* Must not be v2 */
	start = start && vr->version != 2;
	whynot = (!start && !whynot) ? "VRRPv2 does not support v6" : whynot;
	/* Must have a parent interface */
	start = start && (vr->ifp != NULL);
	whynot = (!start && !whynot) ? "No base interface" : whynot;
#if 0
	/* Parent interface must be up */
	start = start && if_is_operative(vr->ifp);
	start = (!start && !whynot) ? "Base interface inoperative" : whynot;
#endif
	/* Must have a macvlan interface */
	start = start && (r->mvl_ifp != NULL);
	whynot = (!start && !whynot) ? "No VRRP interface" : whynot;
#if 0
	/* Macvlan interface must be admin up */
	start = start && CHECK_FLAG(r->mvl_ifp->flags, IFF_UP);
	start = (!start && !whynot) ? "Macvlan device admin down" : whynot;
	/* Macvlan interface must have a link local */
	start = start && connected_get_linklocal(r->mvl_ifp);
	whynot =
		(!start && !whynot) ? "No link local address configured" : whynot;
	/* Macvlan interface must have a v6 IP besides the link local */
	start = start && (connected_count_by_family(r->mvl_ifp, AF_INET6) > 1);
	whynot = (!start && !whynot)
			 ? "No Virtual IPv6 address configured on macvlan device"
			 : whynot;
#endif
	/* Must have at least one VIP configured */
	start = start && r->addrs->count > 0;
	whynot =
		(!start && !whynot) ? "No Virtual IP address configured" : whynot;
	if (start)
		vrrp_event(r, VRRP_EVENT_STARTUP);
	else if (whynot)
		zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
			  "Refusing to start Virtual Router: %s",
			  vr->vrid, family2str(r->family), whynot);
}

void vrrp_set_priority(struct vrrp_vrouter *vr, uint8_t priority)
{
	vr->priority = priority;
	vr->v4->priority = priority;
	vr->v6->priority = priority;
}

void vrrp_set_advertisement_interval(struct vrrp_vrouter *vr,
				     uint16_t advertisement_interval)
{
	if (vr->advertisement_interval == advertisement_interval)
		return;

	vr->advertisement_interval = advertisement_interval;
	vrrp_recalculate_timers(vr->v4);
	vrrp_recalculate_timers(vr->v6);
}

static bool vrrp_has_ip(struct vrrp_vrouter *vr, struct ipaddr *ip)
{
	struct vrrp_router *r = ip->ipa_type == IPADDR_V4 ? vr->v4 : vr->v6;
	struct listnode *ln;
	struct ipaddr *iter;

	for (ALL_LIST_ELEMENTS_RO(r->addrs, ln, iter))
		if (!ipaddr_cmp(iter, ip))
			return true;

	return false;
}

int vrrp_add_ip(struct vrrp_vrouter *vr, struct ipaddr *ip)
{
	struct vrrp_router *r = IS_IPADDR_V4(ip) ? vr->v4 : vr->v6;
	int af = r->family;

	assert(r->family == af);
	assert(!(r->vr->version == 2 && ip->ipa_type == IPADDR_V6));

	if (vrrp_has_ip(r->vr, ip))
		return 0;

	if (!vrrp_is_owner(r->vr->ifp, ip) && r->is_owner) {
		char ipbuf[INET6_ADDRSTRLEN];

		inet_ntop(r->family, &ip->ip, ipbuf, sizeof(ipbuf));
		zlog_err(
			VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
			"This VRRP router is not the address owner of %s, but is the address owner of other addresses; this config is unsupported.",
			r->vr->vrid, family2str(r->family), ipbuf);
		return -1;
	}

	struct ipaddr *new = XCALLOC(MTYPE_VRRP_IP, sizeof(struct ipaddr));

	*new = *ip;
	listnode_add(r->addrs, new);

	if (r->fsm.state == VRRP_STATE_MASTER) {
		switch (r->family) {
		case AF_INET:
			vrrp_garp_send(r, &new->ipaddr_v4);
			break;
		case AF_INET6:
			vrrp_ndisc_una_send(r, new);
			break;
		}
	}

	return 0;
}

int vrrp_add_ipv4(struct vrrp_vrouter *vr, struct in_addr v4)
{
	struct ipaddr ip;

	ip.ipa_type = IPADDR_V4;
	ip.ipaddr_v4 = v4;
	return vrrp_add_ip(vr, &ip);
}

int vrrp_add_ipv6(struct vrrp_vrouter *vr, struct in6_addr v6)
{
	assert(vr->version != 2);

	struct ipaddr ip;

	ip.ipa_type = IPADDR_V6;
	ip.ipaddr_v6 = v6;
	return vrrp_add_ip(vr, &ip);
}

int vrrp_del_ip(struct vrrp_vrouter *vr, struct ipaddr *ip)
{
	struct listnode *ln, *nn;
	struct ipaddr *iter;
	int ret = 0;

	struct vrrp_router *r = IS_IPADDR_V4(ip) ? vr->v4 : vr->v6;

	if (!vrrp_has_ip(r->vr, ip))
		return 0;

	for (ALL_LIST_ELEMENTS(r->addrs, ln, nn, iter))
		if (!ipaddr_cmp(iter, ip))
			list_delete_node(r->addrs, ln);

	/*
	 * NB: Deleting the last address and then issuing a shutdown will cause
	 * transmission of a priority 0 VRRP Advertisement - as per the RFC -
	 * but it will have no addresses. This is not forbidden in the RFC but
	 * might confuse other implementations.
	 */
	if (r->addrs->count == 0 && r->fsm.state != VRRP_STATE_INITIALIZE)
		ret = vrrp_event(r, VRRP_EVENT_SHUTDOWN);

	return ret;
}

int vrrp_del_ipv6(struct vrrp_vrouter *vr, struct in6_addr v6)
{
	struct ipaddr ip;

	ip.ipa_type = IPADDR_V6;
	ip.ipaddr_v6 = v6;
	return vrrp_del_ip(vr, &ip);
}

int vrrp_del_ipv4(struct vrrp_vrouter *vr, struct in_addr v4)
{
	struct ipaddr ip;

	ip.ipa_type = IPADDR_V4;
	ip.ipaddr_v4 = v4;
	return vrrp_del_ip(vr, &ip);
}


/* Creation and destruction ------------------------------------------------ */

static void vrrp_router_addr_list_del_cb(void *val)
{
	struct ipaddr *ip = val;

	XFREE(MTYPE_VRRP_IP, ip);
}

/*
 * Search for a suitable macvlan subinterface we can attach to, and if found,
 * attach to it.
 *
 * r
 *    Router to attach to interface
 *
 * Returns:
 *    Whether an interface was successfully attached
 */
static bool vrrp_attach_interface(struct vrrp_router *r)
{
	/* Search for existing interface with computed MAC address */
	struct interface **ifps;

	size_t ifps_cnt =
		if_lookup_by_hwaddr(r->vmac.octet, sizeof(r->vmac.octet), &ifps,
				    r->vr->ifp->vrf->vrf_id);

	/*
	 * Filter to only those macvlan interfaces whose parent is the base
	 * interface this VRRP router is configured on.
	 *
	 * If there are still multiple interfaces we just select the first one,
	 * as it should be functionally identical to the others.
	 */
	unsigned int candidates = 0;
	struct interface *selection = NULL;

	for (unsigned int i = 0; i < ifps_cnt; i++) {
		if (ifps[i]->link_ifindex != r->vr->ifp->ifindex)
			ifps[i] = NULL;
		else {
			selection = selection ? selection : ifps[i];
			candidates++;
		}
	}

	if (ifps_cnt)
		XFREE(MTYPE_TMP, ifps);

	char ethstr[ETHER_ADDR_STRLEN];

	prefix_mac2str(&r->vmac, ethstr, sizeof(ethstr));

	assert(!!selection == !!candidates);

	if (candidates == 0)
		zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
			  "Interface: None (no interface found w/ MAC %s)",
			  r->vr->vrid, family2str(r->family), ethstr);
	else if (candidates > 1)
		zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
			  "Interface: Multiple interfaces found; using %s",
			  r->vr->vrid, family2str(r->family), selection->name);
	else
		zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
			  "Interface: %s",
			  r->vr->vrid, family2str(r->family), selection->name);

	r->mvl_ifp = selection;

	return !!r->mvl_ifp;
}

static struct vrrp_router *vrrp_router_create(struct vrrp_vrouter *vr,
					      int family)
{
	struct vrrp_router *r =
		XCALLOC(MTYPE_VRRP_RTR, sizeof(struct vrrp_router));

	r->family = family;
	r->sock_rx = -1;
	r->sock_tx = -1;
	r->vr = vr;
	r->addrs = list_new();
	r->addrs->del = vrrp_router_addr_list_del_cb;
	r->priority = vr->priority;
	r->fsm.state = VRRP_STATE_INITIALIZE;
	vrrp_mac_set(&r->vmac, family == AF_INET6, vr->vrid);

	vrrp_attach_interface(r);

	return r;
}

static void vrrp_router_destroy(struct vrrp_router *r)
{
	if (r->is_active)
		vrrp_event(r, VRRP_EVENT_SHUTDOWN);

	if (r->sock_rx >= 0)
		close(r->sock_rx);
	if (r->sock_tx >= 0)
		close(r->sock_tx);

	/* FIXME: also delete list elements */
	list_delete(&r->addrs);
	XFREE(MTYPE_VRRP_RTR, r);
}

struct vrrp_vrouter *vrrp_vrouter_create(struct interface *ifp, uint8_t vrid,
					 uint8_t version)
{
	struct vrrp_vrouter *vr = vrrp_lookup(ifp, vrid);

	if (vr)
		return vr;

	if (version != 2 && version != 3)
		return NULL;

	vr = XCALLOC(MTYPE_VRRP_RTR, sizeof(struct vrrp_vrouter));

	vr->ifp = ifp;
	vr->version = version;
	vr->vrid = vrid;
	vr->priority = vd.priority;
	vr->preempt_mode = vd.preempt_mode;
	vr->accept_mode = vd.accept_mode;
	vr->checksum_with_ipv4_pseudoheader =
		vd.checksum_with_ipv4_pseudoheader;
	vr->shutdown = vd.shutdown;

	vr->v4 = vrrp_router_create(vr, AF_INET);
	vr->v6 = vrrp_router_create(vr, AF_INET6);

	vrrp_set_advertisement_interval(vr, vd.advertisement_interval);

	(void)hash_get(vrrp_vrouters_hash, vr, hash_alloc_intern);

	return vr;
}

void vrrp_vrouter_destroy(struct vrrp_vrouter *vr)
{
	vrrp_router_destroy(vr->v4);
	vrrp_router_destroy(vr->v6);
	hash_release(vrrp_vrouters_hash, vr);
	XFREE(MTYPE_VRRP_RTR, vr);
}

struct vrrp_vrouter *vrrp_lookup(const struct interface *ifp, uint8_t vrid)
{
	if (!ifp)
		return NULL;

	struct vrrp_vrouter vr;

	vr.vrid = vrid;
	vr.ifp = (struct interface *)ifp;

	return hash_lookup(vrrp_vrouters_hash, &vr);
}

/* Network ----------------------------------------------------------------- */

/* Forward decls */
static void vrrp_change_state(struct vrrp_router *r, int to);
static void vrrp_adver_timer_expire(struct event *thread);
static void vrrp_master_down_timer_expire(struct event *thread);

/*
 * Finds the first connected address of the appropriate family on a VRRP
 * router's interface and binds the Tx socket of the VRRP router to that
 * address.
 *
 * Also sets src field of vrrp_router.
 *
 * r
 *    VRRP router to operate on
 *
 * Returns:
 *     0 on success
 *    -1 on failure
 */
static int vrrp_bind_to_primary_connected(struct vrrp_router *r)
{
	struct interface *ifp;

	/*
	 * A slight quirk: the RFC specifies that advertisements under IPv6 must
	 * be transmitted using the link local address of the source interface
	 */
	ifp = r->family == AF_INET ? r->vr->ifp : r->mvl_ifp;

	struct listnode *ln;
	struct connected *c = NULL;

	for (ALL_LIST_ELEMENTS_RO(ifp->connected, ln, c))
		if (c->address->family == r->family) {
			if (r->family == AF_INET6
			    && IN6_IS_ADDR_LINKLOCAL(&c->address->u.prefix6))
				break;
			else if (r->family == AF_INET)
				break;
		}

	if (c == NULL) {
		zlog_err(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
			 "Failed to find address to bind on %s",
			 r->vr->vrid, family2str(r->family), ifp->name);
		return -1;
	}

	union sockunion su;

	memset(&su, 0x00, sizeof(su));

	switch (r->family) {
	case AF_INET:
		r->src.ipa_type = IPADDR_V4;
		r->src.ipaddr_v4 = c->address->u.prefix4;
		su.sin.sin_family = AF_INET;
		su.sin.sin_addr = c->address->u.prefix4;
		break;
	case AF_INET6:
		r->src.ipa_type = IPADDR_V6;
		r->src.ipaddr_v6 = c->address->u.prefix6;
		su.sin6.sin6_family = AF_INET6;
		su.sin6.sin6_scope_id = ifp->ifindex;
		su.sin6.sin6_addr = c->address->u.prefix6;
		break;
	}

	int ret = 0;

	sockopt_reuseaddr(r->sock_tx);
	if (bind(r->sock_tx, (const struct sockaddr *)&su, sizeof(su)) < 0) {
		zlog_err(
			VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
			"Failed to bind Tx socket to primary IP address %pFX: %s",
			r->vr->vrid, family2str(r->family), c->address,
			safe_strerror(errno));
		ret = -1;
	} else {
		DEBUGD(&vrrp_dbg_sock,
		       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
		       "Bound Tx socket to primary IP address %pFX",
		       r->vr->vrid, family2str(r->family), c->address);
	}

	return ret;
}


/*
 * Create and multicast a VRRP ADVERTISEMENT message.
 *
 * r
 *    VRRP Router for which to send ADVERTISEMENT
 */
static void vrrp_send_advertisement(struct vrrp_router *r)
{
	struct vrrp_pkt *pkt;
	ssize_t pktsz;
	struct ipaddr *addrs[r->addrs->count];
	union sockunion dest;

	if (r->src.ipa_type == IPADDR_NONE
	    && vrrp_bind_to_primary_connected(r) < 0)
		return;

	list_to_array(r->addrs, (void **)addrs, r->addrs->count);

	pktsz = vrrp_pkt_adver_build(&pkt, &r->src, r->vr->version, r->vr->vrid,
				     r->priority, r->vr->advertisement_interval,
				     r->addrs->count, (struct ipaddr **)&addrs,
				     r->vr->checksum_with_ipv4_pseudoheader);

	if (DEBUG_MODE_CHECK(&vrrp_dbg_pkt, DEBUG_MODE_ALL))
		zlog_hexdump(pkt, (size_t)pktsz);

	const char *group = r->family == AF_INET ? VRRP_MCASTV4_GROUP_STR
						 : VRRP_MCASTV6_GROUP_STR;
	(void)str2sockunion(group, &dest);

	ssize_t sent = sendto(r->sock_tx, pkt, (size_t)pktsz, 0, &dest.sa,
			      sockunion_sizeof(&dest));

	vrrp_pkt_free(pkt);

	if (sent < 0) {
		zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
			  "Failed to send VRRP Advertisement: %s",
			  r->vr->vrid, family2str(r->family),
			  safe_strerror(errno));
	} else {
		++r->stats.adver_tx_cnt;
	}
}

/*
 * Receive and parse VRRP advertisement.
 *
 * By the time we get here all fields have been validated for basic correctness
 * and the packet is a valid VRRP packet.
 *
 * However, we have not validated whether the VRID is correct for this virtual
 * router, nor whether the priority is correct (i.e. is not 255 when we are the
 * address owner), nor whether the advertisement interval equals our own
 * configured value (this check is only performed in VRRPv2).
 *
 * r
 *    VRRP Router associated with the socket this advertisement was received on
 *
 * src
 *    Source address of sender
 *
 * pkt
 *    The advertisement they sent
 *
 * pktsize
 *    Size of advertisement
 *
 * Returns:
 *    -1 if advertisement is invalid
 *     0 otherwise
 */
static int vrrp_recv_advertisement(struct vrrp_router *r, struct ipaddr *src,
				   struct vrrp_pkt *pkt, size_t pktsize)
{
	char sipstr[INET6_ADDRSTRLEN];
	char dipstr[INET6_ADDRSTRLEN];

	ipaddr2str(src, sipstr, sizeof(sipstr));
	ipaddr2str(&r->src, dipstr, sizeof(dipstr));

	char dumpbuf[BUFSIZ];

	vrrp_pkt_adver_dump(dumpbuf, sizeof(dumpbuf), pkt);
	DEBUGD(&vrrp_dbg_proto,
	       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
	       "Received VRRP Advertisement from %s: %s",
	       r->vr->vrid, family2str(r->family), sipstr, dumpbuf);

	/* Check that VRID matches our configured VRID */
	if (pkt->hdr.vrid != r->vr->vrid) {
		DEBUGD(&vrrp_dbg_proto,
		       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
		       "Datagram invalid: Advertisement contains VRID %hhu which does not match our instance",
		       r->vr->vrid, family2str(r->family), pkt->hdr.vrid);
		return -1;
	}

	/* Verify that we are not the IPvX address owner */
	if (r->is_owner) {
		DEBUGD(&vrrp_dbg_proto,
		       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
		       "Datagram invalid: Received advertisement but we are the address owner",
		       r->vr->vrid, family2str(r->family));
		return -1;
	}

	/* If v2, verify that adver time matches ours */
	bool adveq = (pkt->hdr.v2.adver_int
		      == MAX(r->vr->advertisement_interval / 100, 1));
	if (r->vr->version == 2 && !adveq) {
		DEBUGD(&vrrp_dbg_proto,
		       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
		       "Datagram invalid: Received advertisement with advertisement interval %hhu unequal to our configured value %u",
		       r->vr->vrid, family2str(r->family),
		       pkt->hdr.v2.adver_int,
		       MAX(r->vr->advertisement_interval / 100, 1));
		return -1;
	}


	/* Check that # IPs received matches our # configured IPs */
	if (pkt->hdr.naddr != r->addrs->count)
		DEBUGD(&vrrp_dbg_proto,
		       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
		       "Datagram has %hhu addresses, but this VRRP instance has %u",
		       r->vr->vrid, family2str(r->family), pkt->hdr.naddr,
		       r->addrs->count);

	++r->stats.adver_rx_cnt;

	int addrcmp;

	switch (r->fsm.state) {
	case VRRP_STATE_MASTER:
		addrcmp = ipaddr_cmp(src, &r->src);

		if (pkt->hdr.priority == 0) {
			vrrp_send_advertisement(r);
			EVENT_OFF(r->t_adver_timer);
			event_add_timer_msec(master, vrrp_adver_timer_expire, r,
					     r->vr->advertisement_interval *
						     CS2MS,
					     &r->t_adver_timer);
		} else if (pkt->hdr.priority > r->priority
			   || ((pkt->hdr.priority == r->priority)
			       && addrcmp > 0)) {
			zlog_info(
				VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
				"Received advertisement from %s w/ priority %hhu; switching to Backup",
				r->vr->vrid, family2str(r->family), sipstr,
				pkt->hdr.priority);
			EVENT_OFF(r->t_adver_timer);
			if (r->vr->version == 3) {
				r->master_adver_interval =
					htons(pkt->hdr.v3.adver_int);
			}
			vrrp_recalculate_timers(r);
			EVENT_OFF(r->t_master_down_timer);
			event_add_timer_msec(master,
					     vrrp_master_down_timer_expire, r,
					     r->master_down_interval * CS2MS,
					     &r->t_master_down_timer);
			vrrp_change_state(r, VRRP_STATE_BACKUP);
		} else {
			/* Discard advertisement */
			DEBUGD(&vrrp_dbg_proto,
			       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
			       "Discarding advertisement from %s (%hhu <= %hhu & %s <= %s)",
			       r->vr->vrid, family2str(r->family), sipstr,
			       pkt->hdr.priority, r->priority, sipstr, dipstr);
		}
		break;
	case VRRP_STATE_BACKUP:
		if (pkt->hdr.priority == 0) {
			EVENT_OFF(r->t_master_down_timer);
			event_add_timer_msec(
				master, vrrp_master_down_timer_expire, r,
				r->skew_time * CS2MS, &r->t_master_down_timer);
		} else if (!r->vr->preempt_mode
			   || pkt->hdr.priority >= r->priority) {
			if (r->vr->version == 3) {
				r->master_adver_interval =
					ntohs(pkt->hdr.v3.adver_int);
			}
			vrrp_recalculate_timers(r);
			EVENT_OFF(r->t_master_down_timer);
			event_add_timer_msec(master,
					     vrrp_master_down_timer_expire, r,
					     r->master_down_interval * CS2MS,
					     &r->t_master_down_timer);
		} else if (r->vr->preempt_mode
			   && pkt->hdr.priority < r->priority) {
			/* Discard advertisement */
			DEBUGD(&vrrp_dbg_proto,
			       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
			       "Discarding advertisement from %s (%hhu < %hhu & preempt = true)",
			       r->vr->vrid, family2str(r->family), sipstr,
			       pkt->hdr.priority, r->priority);
		}
		break;
	case VRRP_STATE_INITIALIZE:
		zlog_err(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
			 "Received ADVERTISEMENT in state %s; this is a bug",
			 r->vr->vrid, family2str(r->family),
			 vrrp_state_names[r->fsm.state]);
		break;
	}

	return 0;
}

/*
 * Read and process next IPvX datagram.
 */
static void vrrp_read(struct event *thread)
{
	struct vrrp_router *r = EVENT_ARG(thread);

	struct vrrp_pkt *pkt;
	ssize_t pktsize;
	ssize_t nbytes;
	bool resched;
	char errbuf[BUFSIZ];
	struct sockaddr_storage sa;
	uint8_t control[64];
	struct ipaddr src = {};

	struct msghdr m = {};
	struct iovec iov;

	iov.iov_base = r->ibuf;
	iov.iov_len = sizeof(r->ibuf);
	m.msg_name = &sa;
	m.msg_namelen = sizeof(sa);
	m.msg_iov = &iov;
	m.msg_iovlen = 1;
	m.msg_control = control;
	m.msg_controllen = sizeof(control);

	nbytes = recvmsg(r->sock_rx, &m, MSG_DONTWAIT);

	if ((nbytes < 0 && ERRNO_IO_RETRY(errno))) {
		resched = true;
		goto done;
	} else if (nbytes <= 0) {
		vrrp_event(r, VRRP_EVENT_SHUTDOWN);
		resched = false;
		goto done;
	}

	if (DEBUG_MODE_CHECK(&vrrp_dbg_pkt, DEBUG_MODE_ALL)) {
		DEBUGD(&vrrp_dbg_pkt,
		       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
		       "Datagram rx: ",
		       r->vr->vrid, family2str(r->family));
		zlog_hexdump(r->ibuf, nbytes);
	}

	pktsize = vrrp_pkt_parse_datagram(
		r->family, r->vr->version,
		r->vr->checksum_with_ipv4_pseudoheader, &m, nbytes, &src, &pkt,
		errbuf, sizeof(errbuf));

	if (pktsize < 0)
		DEBUGD(&vrrp_dbg_pkt,
		       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
		       "Datagram invalid: %s",
		       r->vr->vrid, family2str(r->family), errbuf);
	else
		vrrp_recv_advertisement(r, &src, pkt, pktsize);

	resched = true;

done:
	memset(r->ibuf, 0x00, sizeof(r->ibuf));

	if (resched)
		event_add_read(master, vrrp_read, r, r->sock_rx, &r->t_read);
}

/*
 * Creates and configures VRRP router sockets.
 *
 * This function:
 * - Creates two sockets, one for Tx, one for Rx
 * - Binds the Tx socket to the macvlan device, if necessary (VRF case)
 * - Binds the Rx socket to the base interface
 * - Joins the Rx socket to the appropriate VRRP multicast group
 * - Sets the Tx socket to set the TTL (v4) or Hop Limit (v6) field to 255 for
 *   all transmitted IPvX packets
 * - Requests the kernel to deliver IPv6 header values needed to validate VRRP
 *   packets
 *
 * If any of the above fail, the sockets are closed. The only exception is if
 * the TTL / Hop Limit settings fail; these are logged, but configuration
 * proceeds.
 *
 * The first connected address on the Virtual Router's interface is used as the
 * interface address.
 *
 * r
 *    VRRP Router for which to create listen socket
 *
 * Returns:
 *     0 on success
 *    -1 on failure
 */
static int vrrp_socket(struct vrrp_router *r)
{
	int ret;
	bool failed = false;

	frr_with_privs(&vrrp_privs) {
		r->sock_rx = vrf_socket(r->family, SOCK_RAW, IPPROTO_VRRP,
					r->vr->ifp->vrf->vrf_id, NULL);
		r->sock_tx = vrf_socket(r->family, SOCK_RAW, IPPROTO_VRRP,
					r->vr->ifp->vrf->vrf_id, NULL);
	}

	if (r->sock_rx < 0 || r->sock_tx < 0) {
		const char *rxtx = r->sock_rx < 0 ? "Rx" : "Tx";

		zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
			  "Can't create VRRP %s socket",
			  r->vr->vrid, family2str(r->family), rxtx);
		failed = true;
		goto done;
	}

	/*
	 * Bind Tx socket to macvlan device - necessary for VRF support,
	 * otherwise the kernel will select the vrf device
	 */
	if (r->vr->ifp->vrf->vrf_id != VRF_DEFAULT) {
		frr_with_privs (&vrrp_privs) {
			ret = setsockopt(r->sock_tx, SOL_SOCKET,
					 SO_BINDTODEVICE, r->mvl_ifp->name,
					 strlen(r->mvl_ifp->name));
		}

		if (ret < 0) {
			zlog_warn(
				VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
				"Failed to bind Tx socket to macvlan device '%s'",
				r->vr->vrid, family2str(r->family),
				r->mvl_ifp->name);
			failed = true;
			goto done;
		}
	}
	/* Configure sockets */
	if (r->family == AF_INET) {
		/* Set Tx socket to always Tx with TTL set to 255 */
		int ttl = 255;

		ret = setsockopt(r->sock_tx, IPPROTO_IP, IP_MULTICAST_TTL, &ttl,
				 sizeof(ttl));
		if (ret < 0) {
			zlog_warn(
				VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
				"Failed to set outgoing multicast TTL count to 255; RFC 5798 compliant implementations will drop our packets",
				r->vr->vrid, family2str(r->family));
		}

		/* Set Tx socket DSCP byte */
		setsockopt_ipv4_tos(r->sock_tx, IPTOS_PREC_INTERNETCONTROL);

		/* Turn off multicast loop on Tx */
		setsockopt_ipv4_multicast_loop(r->sock_tx, 0);

		/* Bind Rx socket to exact interface */
		frr_with_privs(&vrrp_privs) {
			ret = setsockopt(r->sock_rx, SOL_SOCKET,
					 SO_BINDTODEVICE, r->vr->ifp->name,
					 strlen(r->vr->ifp->name));
		}
		if (ret) {
			zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
				  "Failed to bind Rx socket to %s: %s",
				  r->vr->vrid, family2str(r->family),
				  r->vr->ifp->name, safe_strerror(errno));
			failed = true;
			goto done;
		}
		DEBUGD(&vrrp_dbg_sock,
		       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
		       "Bound Rx socket to %s",
		       r->vr->vrid, family2str(r->family), r->vr->ifp->name);

		/* Bind Rx socket to v4 multicast address */
		struct sockaddr_in sa = {0};

		sa.sin_family = AF_INET;
		sa.sin_addr.s_addr = htonl(VRRP_MCASTV4_GROUP);
		if (bind(r->sock_rx, (struct sockaddr *)&sa, sizeof(sa))) {
			zlog_err(
				VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
				"Failed to bind Rx socket to VRRP multicast group: %s",
				r->vr->vrid, family2str(r->family),
				safe_strerror(errno));
			failed = true;
			goto done;
		}
		DEBUGD(&vrrp_dbg_sock,
		       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
		       "Bound Rx socket to VRRP multicast group",
		       r->vr->vrid, family2str(r->family));

		/* Join Rx socket to VRRP IPv4 multicast group */
		assert(listhead(r->vr->ifp->connected));
		struct connected *c = listhead(r->vr->ifp->connected)->data;
		struct in_addr v4 = c->address->u.prefix4;

		ret = setsockopt_ipv4_multicast(r->sock_rx, IP_ADD_MEMBERSHIP,
						v4, htonl(VRRP_MCASTV4_GROUP),
						r->vr->ifp->ifindex);
		if (ret < 0) {
			zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID
				  "Failed to join VRRP %s multicast group",
				  r->vr->vrid, family2str(r->family));
			failed = true;
			goto done;
		}
		DEBUGD(&vrrp_dbg_sock,
		       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
		       "Joined VRRP multicast group",
		       r->vr->vrid, family2str(r->family));

		/* Set outgoing interface for advertisements */
		struct ip_mreqn mreqn = {};

		mreqn.imr_ifindex = r->mvl_ifp->ifindex;
		ret = setsockopt(r->sock_tx, IPPROTO_IP, IP_MULTICAST_IF,
				 (void *)&mreqn, sizeof(mreqn));
		if (ret < 0) {
			zlog_warn(
				VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
				"Could not set %s as outgoing multicast interface",
				r->vr->vrid, family2str(r->family),
				r->mvl_ifp->name);
			failed = true;
			goto done;
		}
		DEBUGD(&vrrp_dbg_sock,
		       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
		       "Set %s as outgoing multicast interface",
		       r->vr->vrid, family2str(r->family), r->mvl_ifp->name);

		/* Select and bind source address */
		if (vrrp_bind_to_primary_connected(r) < 0) {
			failed = true;
			goto done;
		}

	} else if (r->family == AF_INET6) {
		/* Always transmit IPv6 packets with hop limit set to 255 */
		ret = setsockopt_ipv6_multicast_hops(r->sock_tx, 255);
		if (ret < 0) {
			zlog_warn(
				VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
				"Failed to set outgoing multicast hop count to 255; RFC 5798 compliant implementations will drop our packets",
				r->vr->vrid, family2str(r->family));
		}

		/* Set Tx socket DSCP byte */
		setsockopt_ipv6_tclass(r->sock_tx, IPTOS_PREC_INTERNETCONTROL);

		/* Request hop limit delivery */
		setsockopt_ipv6_hoplimit(r->sock_rx, 1);
		if (ret < 0) {
			zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
				  "Failed to request IPv6 Hop Limit delivery",
				  r->vr->vrid, family2str(r->family));
			failed = true;
			goto done;
		}

		/* Turn off multicast loop on Tx */
		if (setsockopt_ipv6_multicast_loop(r->sock_tx, 0) < 0) {
			zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
				  "Failed to turn off IPv6 multicast",
				  r->vr->vrid, family2str(r->family));
			failed = true;
			goto done;
		}

		/* Bind Rx socket to exact interface */
		frr_with_privs(&vrrp_privs) {
			ret = setsockopt(r->sock_rx, SOL_SOCKET,
					 SO_BINDTODEVICE, r->vr->ifp->name,
					 strlen(r->vr->ifp->name));
		}
		if (ret) {
			zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
				  "Failed to bind Rx socket to %s: %s",
				  r->vr->vrid, family2str(r->family),
				  r->vr->ifp->name, safe_strerror(errno));
			failed = true;
			goto done;
		}
		DEBUGD(&vrrp_dbg_sock,
		       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
		       "Bound Rx socket to %s",
		       r->vr->vrid, family2str(r->family), r->vr->ifp->name);

		/* Bind Rx socket to v6 multicast address */
		struct sockaddr_in6 sa = {0};

		sa.sin6_family = AF_INET6;
		inet_pton(AF_INET6, VRRP_MCASTV6_GROUP_STR, &sa.sin6_addr);
		if (bind(r->sock_rx, (struct sockaddr *)&sa, sizeof(sa))) {
			zlog_err(
				VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
				"Failed to bind Rx socket to VRRP multicast group: %s",
				r->vr->vrid, family2str(r->family),
				safe_strerror(errno));
			failed = true;
			goto done;
		}
		DEBUGD(&vrrp_dbg_sock,
		       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
		       "Bound Rx socket to VRRP multicast group",
		       r->vr->vrid, family2str(r->family));

		/* Join VRRP IPv6 multicast group */
		struct ipv6_mreq mreq;

		inet_pton(AF_INET6, VRRP_MCASTV6_GROUP_STR,
			  &mreq.ipv6mr_multiaddr);
		mreq.ipv6mr_interface = r->vr->ifp->ifindex;
		ret = setsockopt(r->sock_rx, IPPROTO_IPV6, IPV6_JOIN_GROUP,
				 &mreq, sizeof(mreq));
		if (ret < 0) {
			zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
				  "Failed to join VRRP multicast group",
				  r->vr->vrid, family2str(r->family));
			failed = true;
			goto done;
		}
		DEBUGD(&vrrp_dbg_sock,
		       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
		       "Joined VRRP multicast group",
		       r->vr->vrid, family2str(r->family));

		/* Set outgoing interface for advertisements */
		ret = setsockopt(r->sock_tx, IPPROTO_IPV6, IPV6_MULTICAST_IF,
				 &r->mvl_ifp->ifindex, sizeof(ifindex_t));
		if (ret < 0) {
			zlog_warn(
				VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
				"Could not set %s as outgoing multicast interface",
				r->vr->vrid, family2str(r->family),
				r->mvl_ifp->name);
			failed = true;
			goto done;
		}
		DEBUGD(&vrrp_dbg_sock,
		       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
		       "Set %s as outgoing multicast interface",
		       r->vr->vrid, family2str(r->family), r->mvl_ifp->name);
	}

done:
	ret = 0;
	if (failed) {
		zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
			  "Failed to initialize VRRP router",
			  r->vr->vrid, family2str(r->family));
		if (r->sock_rx >= 0) {
			close(r->sock_rx);
			r->sock_rx = -1;
		}
		if (r->sock_tx >= 0) {
			close(r->sock_tx);
			r->sock_tx = -1;
		}
		ret = -1;
	}

	return ret;
}


/* State machine ----------------------------------------------------------- */

DEFINE_HOOK(vrrp_change_state_hook, (struct vrrp_router *r, int to), (r, to));

/*
 * Handle any necessary actions during state change to MASTER state.
 *
 * r
 *    VRRP Router to operate on
 */
static void vrrp_change_state_master(struct vrrp_router *r)
{
	/* Enable ND Router Advertisements */
	if (r->family == AF_INET6)
		vrrp_zebra_radv_set(r, true);

	/* Set protodown off */
	vrrp_zclient_send_interface_protodown(r->mvl_ifp, false);

	/*
	 * If protodown is already off, we can send our stuff, otherwise we
	 * have to delay until the interface is all the way up
	 */
	if (if_is_operative(r->mvl_ifp)) {
		vrrp_send_advertisement(r);

		if (r->family == AF_INET)
			vrrp_garp_send_all(r);
		else if (r->family == AF_INET6)
			vrrp_ndisc_una_send_all(r);
	} else {
		DEBUGD(&vrrp_dbg_proto,
		       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
		       "Delaying VRRP advertisement until interface is up",
		       r->vr->vrid, family2str(r->family));
		r->advert_pending = true;

		if (r->family == AF_INET) {
			DEBUGD(&vrrp_dbg_proto,
			       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
			       "Delaying VRRP gratuitous ARPs until interface is up",
			       r->vr->vrid, family2str(r->family));
			r->garp_pending = true;
		} else if (r->family == AF_INET6) {
			DEBUGD(&vrrp_dbg_proto,
			       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
			       "Delaying VRRP unsolicited neighbor advertisement until interface is up",
			       r->vr->vrid, family2str(r->family));
			r->ndisc_pending = true;
		}
	}
}

/*
 * Handle any necessary actions during state change to BACKUP state.
 *
 * r
 *    Virtual Router to operate on
 */
static void vrrp_change_state_backup(struct vrrp_router *r)
{
	/* Disable ND Router Advertisements */
	if (r->family == AF_INET6)
		vrrp_zebra_radv_set(r, false);

	/* Disable Adver_Timer */
	EVENT_OFF(r->t_adver_timer);

	r->advert_pending = false;
	r->garp_pending = false;
	r->ndisc_pending = false;
	memset(&r->src, 0x00, sizeof(r->src));

	vrrp_zclient_send_interface_protodown(r->mvl_ifp, true);
}

/*
 * Handle any necessary actions during state change to INITIALIZE state.
 *
 * This is not called for initial startup, only when transitioning from MASTER
 * or BACKUP.
 *
 * r
 *    VRRP Router to operate on
 */
static void vrrp_change_state_initialize(struct vrrp_router *r)
{
	r->master_adver_interval = 0;
	vrrp_recalculate_timers(r);

	r->advert_pending = false;
	r->garp_pending = false;
	r->ndisc_pending = false;

	/* Disable ND Router Advertisements */
	if (r->family == AF_INET6 && r->mvl_ifp)
		vrrp_zebra_radv_set(r, false);
}

void (*const vrrp_change_state_handlers[])(struct vrrp_router *vr) = {
	[VRRP_STATE_MASTER] = vrrp_change_state_master,
	[VRRP_STATE_BACKUP] = vrrp_change_state_backup,
	[VRRP_STATE_INITIALIZE] = vrrp_change_state_initialize,
};

/*
 * Change Virtual Router FSM position. Handles transitional actions and calls
 * any subscribers to the state change hook.
 *
 * r
 *    Virtual Router for which to change state
 *
 * to
 *    State to change to
 */
static void vrrp_change_state(struct vrrp_router *r, int to)
{
	if (r->fsm.state == to)
		return;

	/* Call our handlers, then any subscribers */
	vrrp_change_state_handlers[to](r);
	hook_call(vrrp_change_state_hook, r, to);
	zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM "%s -> %s",
		  r->vr->vrid, family2str(r->family),
		  vrrp_state_names[r->fsm.state], vrrp_state_names[to]);
	r->fsm.state = to;

	++r->stats.trans_cnt;
}

/*
 * Called when Adver_Timer expires.
 */
static void vrrp_adver_timer_expire(struct event *thread)
{
	struct vrrp_router *r = EVENT_ARG(thread);

	DEBUGD(&vrrp_dbg_proto,
	       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
	       "Adver_Timer expired",
	       r->vr->vrid, family2str(r->family));

	if (r->fsm.state == VRRP_STATE_MASTER) {
		/* Send an ADVERTISEMENT */
		vrrp_send_advertisement(r);

		/* Reset the Adver_Timer to Advertisement_Interval */
		event_add_timer_msec(master, vrrp_adver_timer_expire, r,
				     r->vr->advertisement_interval * CS2MS,
				     &r->t_adver_timer);
	} else {
		zlog_err(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
			 "Adver_Timer expired in state '%s'; this is a bug",
			 r->vr->vrid, family2str(r->family),
			 vrrp_state_names[r->fsm.state]);
	}
}

/*
 * Called when Master_Down_Timer expires.
 */
static void vrrp_master_down_timer_expire(struct event *thread)
{
	struct vrrp_router *r = EVENT_ARG(thread);

	zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
		  "Master_Down_Timer expired",
		  r->vr->vrid, family2str(r->family));

	event_add_timer_msec(master, vrrp_adver_timer_expire, r,
			     r->vr->advertisement_interval * CS2MS,
			     &r->t_adver_timer);
	vrrp_change_state(r, VRRP_STATE_MASTER);
}

/*
 * Event handler for Startup event.
 *
 * Creates sockets, sends advertisements and ARP requests, starts timers,
 * and transitions the Virtual Router to either Master or Backup states.
 *
 * This function will also initialize the program's global ARP subsystem if it
 * has not yet been initialized.
 *
 * r
 *    VRRP Router on which to apply Startup event
 *
 * Returns:
 *    < 0 if the session socket could not be created, or the state is not
 *        Initialize
 *      0 on success
 */
static int vrrp_startup(struct vrrp_router *r)
{
	/* May only be called when the state is Initialize */
	if (r->fsm.state != VRRP_STATE_INITIALIZE)
		return -1;

	/* Must have a valid macvlan interface available */
	if (r->mvl_ifp == NULL && !vrrp_attach_interface(r)) {
		zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
			  "No appropriate interface found",
			  r->vr->vrid, family2str(r->family));
		return -1;
	}

	/* Initialize global gratuitous ARP socket if necessary */
	if (r->family == AF_INET && !vrrp_garp_is_init())
		vrrp_garp_init();
	if (r->family == AF_INET6 && !vrrp_ndisc_is_init())
		vrrp_ndisc_init();

	/* Create socket */
	if (r->sock_rx < 0 || r->sock_tx < 0) {
		int ret = vrrp_socket(r);

		if (ret < 0 || r->sock_tx < 0 || r->sock_rx < 0)
			return ret;
	}

	/* Schedule listener */
	event_add_read(master, vrrp_read, r, r->sock_rx, &r->t_read);

	/* Configure effective priority */
	assert(listhead(r->addrs));
	struct ipaddr *primary = (struct ipaddr *)listhead(r->addrs)->data;
	char ipbuf[INET6_ADDRSTRLEN];

	inet_ntop(r->family, &primary->ip.addr, ipbuf, sizeof(ipbuf));

	if (r->vr->priority == VRRP_PRIO_MASTER
	    || vrrp_is_owner(r->vr->ifp, primary)) {
		r->priority = VRRP_PRIO_MASTER;
		vrrp_recalculate_timers(r);

		zlog_info(
			VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
			"%s has priority set to 255 or owns primary Virtual Router IP %s; electing self as Master",
			r->vr->vrid, family2str(r->family), r->vr->ifp->name,
			ipbuf);
	}

	if (r->priority == VRRP_PRIO_MASTER) {
		event_add_timer_msec(master, vrrp_adver_timer_expire, r,
				     r->vr->advertisement_interval * CS2MS,
				     &r->t_adver_timer);
		vrrp_change_state(r, VRRP_STATE_MASTER);
	} else {
		r->master_adver_interval = r->vr->advertisement_interval;
		vrrp_recalculate_timers(r);
		event_add_timer_msec(master, vrrp_master_down_timer_expire, r,
				     r->master_down_interval * CS2MS,
				     &r->t_master_down_timer);
		vrrp_change_state(r, VRRP_STATE_BACKUP);
	}

	r->is_active = true;

	return 0;
}

/*
 * Shuts down a Virtual Router and transitions it to Initialize.
 *
 * This call must be idempotent; it is safe to call multiple times on the same
 * VRRP Router.
 */
static int vrrp_shutdown(struct vrrp_router *r)
{
	uint8_t saved_prio;

	switch (r->fsm.state) {
	case VRRP_STATE_MASTER:
		/* Send an ADVERTISEMENT with Priority = 0 */
		saved_prio = r->priority;
		r->priority = 0;
		vrrp_send_advertisement(r);
		r->priority = saved_prio;
		break;
	case VRRP_STATE_BACKUP:
		break;
	case VRRP_STATE_INITIALIZE:
		DEBUGD(&vrrp_dbg_proto,
		       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
		       "Received '%s' event in '%s' state; ignoring",
		       r->vr->vrid, family2str(r->family),
		       vrrp_event_names[VRRP_EVENT_SHUTDOWN],
		       vrrp_state_names[VRRP_STATE_INITIALIZE]);
		return 0;
	}

	/* Cancel all timers */
	EVENT_OFF(r->t_adver_timer);
	EVENT_OFF(r->t_master_down_timer);
	EVENT_OFF(r->t_read);
	EVENT_OFF(r->t_write);

	/* Protodown macvlan */
	if (r->mvl_ifp)
		vrrp_zclient_send_interface_protodown(r->mvl_ifp, true);

	/* Throw away our source address */
	memset(&r->src, 0x00, sizeof(r->src));

	if (r->sock_rx > 0) {
		close(r->sock_rx);
		r->sock_rx = -1;
	}
	if (r->sock_tx > 0) {
		close(r->sock_tx);
		r->sock_tx = -1;
	}

	vrrp_change_state(r, VRRP_STATE_INITIALIZE);

	r->is_active = false;

	return 0;
}

static int (*const vrrp_event_handlers[])(struct vrrp_router *r) = {
	[VRRP_EVENT_STARTUP] = vrrp_startup,
	[VRRP_EVENT_SHUTDOWN] = vrrp_shutdown,
};

/*
 * Spawn a VRRP FSM event on a VRRP Router.
 *
 * vr
 *    VRRP Router on which to spawn event
 *
 * event
 *    The event to spawn
 *
 * Returns:
 *    -1 on failure
 *     0 otherwise
 */
int vrrp_event(struct vrrp_router *r, int event)
{
	zlog_info(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM "'%s' event",
		  r->vr->vrid, family2str(r->family), vrrp_event_names[event]);
	return vrrp_event_handlers[event](r);
}


/* Autoconfig -------------------------------------------------------------- */

/*
 * Set the configured addresses for this VRRP instance to exactly the addresses
 * present on its macvlan subinterface(s).
 *
 * vr
 *    VRRP router to act on
 */
static void vrrp_autoconfig_autoaddrupdate(struct vrrp_router *r)
{
	struct listnode *ln;
	struct connected *c = NULL;
	bool is_v6_ll;

	if (!r->mvl_ifp)
		return;

	DEBUGD(&vrrp_dbg_auto,
	       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
	       "Setting Virtual IP list to match IPv4 addresses on %s",
	       r->vr->vrid, family2str(r->family), r->mvl_ifp->name);
	for (ALL_LIST_ELEMENTS_RO(r->mvl_ifp->connected, ln, c)) {
		is_v6_ll = (c->address->family == AF_INET6
			    && IN6_IS_ADDR_LINKLOCAL(&c->address->u.prefix6));
		if (c->address->family == r->family && !is_v6_ll) {
			DEBUGD(&vrrp_dbg_auto,
			       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
			       "Adding %pFX",
			       r->vr->vrid, family2str(r->family), c->address);
			if (r->family == AF_INET)
				vrrp_add_ipv4(r->vr, c->address->u.prefix4);
			else if (r->vr->version == 3)
				vrrp_add_ipv6(r->vr, c->address->u.prefix6);
		}
	}

	vrrp_check_start(r->vr);

	if (r->addrs->count == 0 && r->fsm.state != VRRP_STATE_INITIALIZE) {
		DEBUGD(&vrrp_dbg_auto,
		       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
		       "Virtual IP list is empty; shutting down",
		       r->vr->vrid, family2str(r->family));
		vrrp_event(r, VRRP_EVENT_SHUTDOWN);
	}
}

static struct vrrp_vrouter *
vrrp_autoconfig_autocreate(struct interface *mvl_ifp)
{
	struct interface *p;
	struct vrrp_vrouter *vr;

	p = if_lookup_by_index(mvl_ifp->link_ifindex, mvl_ifp->vrf->vrf_id);

	if (!p)
		return NULL;

	uint8_t vrid = mvl_ifp->hw_addr[5];
	uint8_t fam = mvl_ifp->hw_addr[4];

	DEBUGD(&vrrp_dbg_auto,
	       VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
	       "Autoconfiguring VRRP on %s",
	       vrid, family2str(fam), p->name);

	vr = vrrp_vrouter_create(p, vrid, vrrp_autoconfig_version);

	if (!vr) {
		zlog_warn(VRRP_LOGPFX VRRP_LOGPFX_VRID VRRP_LOGPFX_FAM
			  "Failed to autoconfigure VRRP on %s",
			  vrid, family2str(fam), p->name);
		return NULL;
	}

	vr->autoconf = true;

	/*
	 * If these interfaces are protodown on, we need to un-protodown them
	 * in order to get Zebra to send us their addresses so we can
	 * autoconfigure them.
	 */
	if (vr->v4->mvl_ifp)
		vrrp_zclient_send_interface_protodown(vr->v4->mvl_ifp, false);
	if (vr->v6->mvl_ifp)
		vrrp_zclient_send_interface_protodown(vr->v6->mvl_ifp, false);

	 /* If they're not, we can go ahead and add the addresses we have */
	vrrp_autoconfig_autoaddrupdate(vr->v4);
	vrrp_autoconfig_autoaddrupdate(vr->v6);

	return vr;
}

/*
 * Callback to notify autoconfig of interface add.
 *
 * If the interface is a VRRP-compatible device, and there is no existing VRRP
 * router running on it, one is created. All addresses on the interface are
 * added to the router.
 *
 * ifp
 *    Interface to operate on
 *
 * Returns:
 *    -1 on failure
 *     0 otherwise
 */
static int vrrp_autoconfig_if_add(struct interface *ifp)
{
	bool created = false;
	struct vrrp_vrouter *vr;

	if (!vrrp_autoconfig_is_on)
		return 0;

	if (!ifp || !ifp->link_ifindex || !vrrp_ifp_has_vrrp_mac(ifp))
		return -1;

	vr = vrrp_lookup_by_if_mvl(ifp);

	if (!vr) {
		vr = vrrp_autoconfig_autocreate(ifp);
		created = true;
	}

	if (!vr || !vr->autoconf)
		return 0;

	if (!created) {
		/*
		 * We didn't create it, but it has already been autoconfigured.
		 * Try to attach this interface to the existing instance.
		 */
		if (!vr->v4->mvl_ifp) {
			vrrp_attach_interface(vr->v4);
			/* If we just attached it, make sure it's turned on */
			if (vr->v4->mvl_ifp) {
				vrrp_zclient_send_interface_protodown(
					vr->v4->mvl_ifp, false);
				/*
				 * If it's already up, we can go ahead and add
				 * the addresses we have
				 */
				vrrp_autoconfig_autoaddrupdate(vr->v4);
			}
		}
		if (!vr->v6->mvl_ifp) {
			vrrp_attach_interface(vr->v6);
			/* If we just attached it, make sure it's turned on */
			if (vr->v6->mvl_ifp) {
				vrrp_zclient_send_interface_protodown(
					vr->v6->mvl_ifp, false);
				/*
				 * If it's already up, we can go ahead and add
				 * the addresses we have
				 */
				vrrp_autoconfig_autoaddrupdate(vr->v6);
			}
		}
	}

	return 0;
}

/*
 * Callback to notify autoconfig of interface delete.
 *
 * If the interface is a VRRP-compatible device, and a VRRP router is running
 * on it, and that VRRP router was automatically configured, it will be
 * deleted. If that was the last router for the corresponding VRID (i.e., if
 * this interface was a v4 VRRP interface and no v6 router is configured for
 * the same VRID) then the entire virtual router is deleted.
 *
 * ifp
 *    Interface to operate on
 *
 * Returns:
 *    -1 on failure
 *     0 otherwise
 */
static int vrrp_autoconfig_if_del(struct interface *ifp)
{
	if (!vrrp_autoconfig_is_on)
		return 0;

	struct vrrp_vrouter *vr;
	struct listnode *ln;
	struct list *vrs;

	vrs = vrrp_lookup_by_if_any(ifp);

	for (ALL_LIST_ELEMENTS_RO(vrs, ln, vr))
		if (vr->autoconf
		    && (!vr->ifp || (!vr->v4->mvl_ifp && !vr->v6->mvl_ifp))) {
			DEBUGD(&vrrp_dbg_auto,
			       VRRP_LOGPFX VRRP_LOGPFX_VRID
			       "All VRRP interfaces for instance deleted; destroying autoconfigured VRRP router",
			       vr->vrid);
			vrrp_vrouter_destroy(vr);
		}

	list_delete(&vrs);

	return 0;
}

/*
 * Callback to notify autoconfig of interface up.
 *
 * Creates VRRP instance on interface if it does not exist. Otherwise does
 * nothing.
 *
 * ifp
 *    Interface to operate on
 *
 * Returns:
 *    -1 on failure
 *     0 otherwise
 */
static int vrrp_autoconfig_if_up(struct interface *ifp)
{
	if (!vrrp_autoconfig_is_on)
		return 0;

	struct vrrp_vrouter *vr = vrrp_lookup_by_if_mvl(ifp);

	if (vr && !vr->autoconf)
		return 0;

	if (!vr) {
		vrrp_autoconfig_if_add(ifp);
		return 0;
	}

	return 0;
}

/*
 * Callback to notify autoconfig of interface down.
 *
 * Does nothing. An interface down event is accompanied by address deletion
 * events for all the addresses on the interface; if an autoconfigured VRRP
 * router exists on this interface, then it will have all its addresses deleted
 * and end up in Initialize.
 *
 * ifp
 *    Interface to operate on
 *
 * Returns:
 *    -1 on failure
 *     0 otherwise
 */
static int vrrp_autoconfig_if_down(struct interface *ifp)
{
	if (!vrrp_autoconfig_is_on)
		return 0;

	return 0;
}

/*
 * Callback to notify autoconfig of a new interface address.
 *
 * If a VRRP router exists on this interface, its address list is updated to
 * match the new address list. If no addresses remain, a Shutdown event is
 * issued to the VRRP router.
 *
 * ifp
 *    Interface to operate on
 *
 * Returns:
 *    -1 on failure
 *     0 otherwise
 *
 */
static int vrrp_autoconfig_if_address_add(struct interface *ifp)
{
	if (!vrrp_autoconfig_is_on)
		return 0;

	struct vrrp_vrouter *vr = vrrp_lookup_by_if_mvl(ifp);

	if (vr && vr->autoconf) {
		if (vr->v4->mvl_ifp == ifp)
			vrrp_autoconfig_autoaddrupdate(vr->v4);
		else if (vr->v6->mvl_ifp == ifp)
			vrrp_autoconfig_autoaddrupdate(vr->v6);
	}

	return 0;
}

/*
 * Callback to notify autoconfig of a removed interface address.
 *
 * If a VRRP router exists on this interface, its address list is updated to
 * match the new address list. If no addresses remain, a Shutdown event is
 * issued to the VRRP router.
 *
 * ifp
 *    Interface to operate on
 *
 * Returns:
 *    -1 on failure
 *     0 otherwise
 *
 */
static int vrrp_autoconfig_if_address_del(struct interface *ifp)
{
	if (!vrrp_autoconfig_is_on)
		return 0;

	struct vrrp_vrouter *vr = vrrp_lookup_by_if_mvl(ifp);

	if (vr && vr->autoconf) {
		if (vr->v4->mvl_ifp == ifp)
			vrrp_autoconfig_autoaddrupdate(vr->v4);
		else if (vr->v6->mvl_ifp == ifp)
			vrrp_autoconfig_autoaddrupdate(vr->v6);
	}

	return 0;
}

int vrrp_autoconfig(void)
{
	if (!vrrp_autoconfig_is_on)
		return 0;

	struct vrf *vrf;
	struct interface *ifp;

	RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name) {
		FOR_ALL_INTERFACES (vrf, ifp)
			vrrp_autoconfig_if_add(ifp);
	}

	return 0;
}

void vrrp_autoconfig_on(int version)
{
	vrrp_autoconfig_is_on = true;
	vrrp_autoconfig_version = version;

	vrrp_autoconfig();
}

void vrrp_autoconfig_off(void)
{
	vrrp_autoconfig_is_on = false;

	struct list *ll = hash_to_list(vrrp_vrouters_hash);

	struct listnode *ln;
	struct vrrp_vrouter *vr;

	for (ALL_LIST_ELEMENTS_RO(ll, ln, vr))
		if (vr->autoconf)
			vrrp_vrouter_destroy(vr);

	list_delete(&ll);
}

/* Interface tracking ------------------------------------------------------ */

/*
 * Bind any pending interfaces.
 *
 * mvl_ifp
 *    macvlan interface that some VRRP instances might want to bind to
 */
static void vrrp_bind_pending(struct interface *mvl_ifp)
{
	struct vrrp_vrouter *vr;

	DEBUGD(&vrrp_dbg_zebra,
	       VRRP_LOGPFX
	       "Searching for instances that could use interface %s",
	       mvl_ifp->name);

	vr = vrrp_lookup_by_if_mvl(mvl_ifp);

	if (vr) {
		DEBUGD(&vrrp_dbg_zebra,
		       VRRP_LOGPFX VRRP_LOGPFX_VRID
		       "<-- This instance can probably use interface %s",
		       vr->vrid, mvl_ifp->name);

		if (mvl_ifp->hw_addr[4] == 0x01 && !vr->v4->mvl_ifp)
			vrrp_attach_interface(vr->v4);
		else if (mvl_ifp->hw_addr[4] == 0x02 && !vr->v6->mvl_ifp)
			vrrp_attach_interface(vr->v6);
	}
}

void vrrp_if_up(struct interface *ifp)
{
	struct vrrp_vrouter *vr;
	struct listnode *ln;
	struct list *vrs;

	vrrp_bind_pending(ifp);

	vrs = vrrp_lookup_by_if_any(ifp);

	for (ALL_LIST_ELEMENTS_RO(vrs, ln, vr)) {
		vrrp_check_start(vr);

		if (!if_is_operative(ifp))
			continue;

		/*
		 * Handle the situation in which we performed a state
		 * transition on this VRRP router but needed to wait for the
		 * macvlan interface to come up to perform some actions
		 */
		if (ifp == vr->v4->mvl_ifp) {
			if (vr->v4->advert_pending) {
				DEBUGD(&vrrp_dbg_proto,
				       VRRP_LOGPFX VRRP_LOGPFX_VRID
					       VRRP_LOGPFX_FAM
				       "Interface up; sending pending advertisement",
				       vr->vrid, family2str(vr->v4->family));
				vrrp_send_advertisement(vr->v4);
				vr->v4->advert_pending = false;
			}
			if (vr->v4->garp_pending) {
				DEBUGD(&vrrp_dbg_proto,
				       VRRP_LOGPFX VRRP_LOGPFX_VRID
					       VRRP_LOGPFX_FAM
				       "Interface up; sending pending gratuitous ARP",
				       vr->vrid, family2str(vr->v4->family));
				vrrp_garp_send_all(vr->v4);
				vr->v4->garp_pending = false;
			}
		}
		if (ifp == vr->v6->mvl_ifp) {
			if (vr->v6->advert_pending) {
				DEBUGD(&vrrp_dbg_proto,
				       VRRP_LOGPFX VRRP_LOGPFX_VRID
					       VRRP_LOGPFX_FAM
				       "Interface up; sending pending advertisement",
				       vr->vrid, family2str(vr->v6->family));
				vrrp_send_advertisement(vr->v6);
				vr->v6->advert_pending = false;
			}
			if (vr->v6->ndisc_pending) {
				DEBUGD(&vrrp_dbg_proto,
				       VRRP_LOGPFX VRRP_LOGPFX_VRID
					       VRRP_LOGPFX_FAM
				       "Interface up; sending pending Unsolicited Neighbor Advertisement",
				       vr->vrid, family2str(vr->v6->family));
				vrrp_ndisc_una_send_all(vr->v6);
				vr->v6->ndisc_pending = false;
			}
		}
	}

	list_delete(&vrs);

	vrrp_autoconfig_if_up(ifp);
}

void vrrp_if_down(struct interface *ifp)
{
	struct vrrp_vrouter *vr;
	struct listnode *ln;
	struct list *vrs;

	vrrp_bind_pending(ifp);

	vrs = vrrp_lookup_by_if_any(ifp);

	for (ALL_LIST_ELEMENTS_RO(vrs, ln, vr)) {
		vrrp_check_start(vr);

		if (vr->ifp == ifp || vr->v4->mvl_ifp == ifp
		    || vr->v6->mvl_ifp == ifp) {
			DEBUGD(&vrrp_dbg_auto,
			       VRRP_LOGPFX VRRP_LOGPFX_VRID "Interface %s down",
			       vr->vrid, ifp->name);
		}
	}

	list_delete(&vrs);

	vrrp_autoconfig_if_down(ifp);
}

void vrrp_if_add(struct interface *ifp)
{
	vrrp_bind_pending(ifp);

	/* thanks, zebra */
	if (CHECK_FLAG(ifp->flags, IFF_UP))
		vrrp_if_up(ifp);

	vrrp_autoconfig_if_add(ifp);
}

void vrrp_if_del(struct interface *ifp)
{
	struct listnode *ln;
	struct vrrp_vrouter *vr;

	vrrp_if_down(ifp);

	/*
	 * You think we'd be able use vrrp_lookup_by_if_any to find interfaces?
	 * Nah. FRR's interface management is insane. There are no ordering
	 * guarantees about what interfaces are deleted when. Maybe this is a
	 * macvlan and its parent was already deleted, in which case its
	 * ifindex is now IFINDEX_INTERNAL, so ifp->link_ifindex - while still
	 * valid - doesn't match any interface on the system, meaning we can't
	 * use any of the vrrp_lookup* functions since they rely on finding the
	 * base interface of what they're given by following link_ifindex.
	 *
	 * Since we need to actually NULL out pointers in this function to
	 * avoid a UAF - since the caller will (might) free ifp after we return
	 * - we need to look up based on pointers.
	 */
	struct list *vrs = hash_to_list(vrrp_vrouters_hash);

	for (ALL_LIST_ELEMENTS_RO(vrs, ln, vr)) {
		if (ifp == vr->ifp) {
			vrrp_event(vr->v4, VRRP_EVENT_SHUTDOWN);
			vrrp_event(vr->v6, VRRP_EVENT_SHUTDOWN);
			/*
			 * Stands to reason if the base was deleted, so were
			 * (or will be) its children
			 */
			vr->v4->mvl_ifp = NULL;
			vr->v6->mvl_ifp = NULL;
			/*
			 * We shouldn't need to lose the reference if it's the
			 * primary interface, because that was configured
			 * explicitly in our config, and thus will be kept as a
			 * stub; to avoid stupid bugs, double check that
			 */
			assert(ifp->configured);
		} else if (ifp == vr->v4->mvl_ifp) {
			vrrp_event(vr->v4, VRRP_EVENT_SHUTDOWN);
			/*
			 * If this is a macvlan, then it wasn't explicitly
			 * configured and will be deleted when we return from
			 * this function, so we need to lose the reference
			 */
			vr->v4->mvl_ifp = NULL;
		} else if (ifp == vr->v6->mvl_ifp) {
			vrrp_event(vr->v6, VRRP_EVENT_SHUTDOWN);
			/*
			 * If this is a macvlan, then it wasn't explicitly
			 * configured and will be deleted when we return from
			 * this function, so we need to lose the reference
			 */
			vr->v6->mvl_ifp = NULL;
		}
	}

	list_delete(&vrs);

	vrrp_autoconfig_if_del(ifp);
}

void vrrp_if_address_add(struct interface *ifp)
{
	struct vrrp_vrouter *vr;
	struct listnode *ln;
	struct list *vrs;

	/*
	 * We have to do a wide search here, because we need to know when a v6
	 * macvlan device gets a new address. This is because the macvlan link
	 * local is used as the source address for v6 advertisements, and hence
	 * "do I have a link local" constitutes an activation condition for v6
	 * virtual routers.
	 */
	vrs = vrrp_lookup_by_if_any(ifp);

	for (ALL_LIST_ELEMENTS_RO(vrs, ln, vr))
		vrrp_check_start(vr);

	list_delete(&vrs);

	vrrp_autoconfig_if_address_add(ifp);
}

void vrrp_if_address_del(struct interface *ifp)
{
	/*
	 * Zebra is stupid and sends us address deletion notifications
	 * when any of the following condition sets are met:
	 *
	 * - if_is_operative && address deleted
	 * - if_is_operative -> !if_is_operative
	 *
	 * Note that the second one is nonsense, because Zebra behaves as
	 * though an interface going down means all the addresses on that
	 * interface got deleted. Which is a problem for autoconfig because all
	 * the addresses on an interface going away means the VRRP session goes
	 * to Initialize. However interfaces go down whenever we transition to
	 * Backup, so this effectively means that for autoconfigured instances
	 * we actually end up in Initialize whenever we try to go into Backup.
	 *
	 * Also, Zebra does NOT send us notifications when:
	 * - !if_is_operative && address deleted
	 *
	 * Which means if we're in backup and an address is deleted out from
	 * under us, we won't even know.
	 *
	 * The only solution here is to only resynchronize our address list
	 * when:
	 *
	 * - An interfaces comes up
	 * - An interface address is added
	 * - An interface address is deleted AND the interface is up
	 *
	 * Even though this is only a problem with autoconfig at the moment I'm
	 * papering over Zebra's braindead semantics here. Every piece of code
	 * in this function should be protected by a check that the interface
	 * is up.
	 */
	if (if_is_operative(ifp))
		vrrp_autoconfig_if_address_del(ifp);
}

/* Other ------------------------------------------------------------------- */

int vrrp_config_write_global(struct vty *vty)
{
	unsigned int writes = 0;

	if (vrrp_autoconfig_is_on && ++writes)
		vty_out(vty, "vrrp autoconfigure%s\n",
			vrrp_autoconfig_version == 2 ? " version 2" : "");

	/* FIXME: needs to be udpated for full YANG conversion. */
	if (vd.priority != VRRP_DEFAULT_PRIORITY && ++writes)
		vty_out(vty, "vrrp default priority %hhu\n", vd.priority);

	if (vd.advertisement_interval != VRRP_DEFAULT_ADVINT && ++writes)
		vty_out(vty,
			"vrrp default advertisement-interval %u\n",
			vd.advertisement_interval * CS2MS);

	if (vd.preempt_mode != VRRP_DEFAULT_PREEMPT && ++writes)
		vty_out(vty, "%svrrp default preempt\n",
			!vd.preempt_mode ? "no " : "");

	if (vd.accept_mode != VRRP_DEFAULT_ACCEPT && ++writes)
		vty_out(vty, "%svrrp default accept\n",
			!vd.accept_mode ? "no " : "");

	if (vd.checksum_with_ipv4_pseudoheader !=
		    VRRP_DEFAULT_CHECKSUM_WITH_IPV4_PSEUDOHEADER &&
	    ++writes)
		vty_out(vty, "%svrrp default checksum-with-ipv4-pseudoheader\n",
			!vd.checksum_with_ipv4_pseudoheader ? "no " : "");

	if (vd.shutdown != VRRP_DEFAULT_SHUTDOWN && ++writes)
		vty_out(vty, "%svrrp default shutdown\n",
			!vd.shutdown ? "no " : "");

	return writes;
}

static unsigned int vrrp_hash_key(const void *arg)
{
	const struct vrrp_vrouter *vr = arg;
	char key[IFNAMSIZ + 64];

	snprintf(key, sizeof(key), "%s@%u", vr->ifp->name, vr->vrid);

	return string_hash_make(key);
}

static bool vrrp_hash_cmp(const void *arg1, const void *arg2)
{
	const struct vrrp_vrouter *vr1 = arg1;
	const struct vrrp_vrouter *vr2 = arg2;

	if (vr1->ifp != vr2->ifp)
		return false;
	if (vr1->vrid != vr2->vrid)
		return false;

	return true;
}

void vrrp_init(void)
{
	/* Set default defaults */
	vd.version = yang_get_default_uint8("%s/version", VRRP_XPATH_FULL);
	vd.priority = yang_get_default_uint8("%s/priority", VRRP_XPATH_FULL);
	vd.advertisement_interval = yang_get_default_uint16(
		"%s/advertisement-interval", VRRP_XPATH_FULL);
	vd.preempt_mode = yang_get_default_bool("%s/preempt", VRRP_XPATH_FULL);
	vd.accept_mode =
		yang_get_default_bool("%s/accept-mode", VRRP_XPATH_FULL);
	vd.checksum_with_ipv4_pseudoheader = yang_get_default_bool(
		"%s/checksum-with-ipv4-pseudoheader", VRRP_XPATH_FULL);
	vd.shutdown = VRRP_DEFAULT_SHUTDOWN;

	vrrp_autoconfig_version = 3;
	vrrp_vrouters_hash = hash_create(&vrrp_hash_key, vrrp_hash_cmp,
					 "VRRP virtual router hash");
	vrf_init(NULL, NULL, NULL, NULL);
}

void vrrp_fini(void)
{
	/* Destroy all instances */
	struct list *vrs = hash_to_list(vrrp_vrouters_hash);

	struct listnode *ln;
	struct vrrp_vrouter *vr;

	for (ALL_LIST_ELEMENTS_RO(vrs, ln, vr))
		vrrp_vrouter_destroy(vr);

	list_delete(&vrs);

	hash_clean_and_free(&vrrp_vrouters_hash, NULL);
}