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
|
/* BGP attributes management routines.
Copyright (C) 1996, 97, 98, 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 GNU Zebra; see the file COPYING. If not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#include <zebra.h>
#include "linklist.h"
#include "prefix.h"
#include "memory.h"
#include "vector.h"
#include "vty.h"
#include "stream.h"
#include "log.h"
#include "hash.h"
#include "bgpd/bgpd.h"
#include "bgpd/bgp_attr.h"
#include "bgpd/bgp_route.h"
#include "bgpd/bgp_aspath.h"
#include "bgpd/bgp_community.h"
#include "bgpd/bgp_debug.h"
#include "bgpd/bgp_packet.h"
#include "bgpd/bgp_ecommunity.h"
/* Attribute strings for logging. */
static const struct message attr_str [] =
{
{ BGP_ATTR_ORIGIN, "ORIGIN" },
{ BGP_ATTR_AS_PATH, "AS_PATH" },
{ BGP_ATTR_NEXT_HOP, "NEXT_HOP" },
{ BGP_ATTR_MULTI_EXIT_DISC, "MULTI_EXIT_DISC" },
{ BGP_ATTR_LOCAL_PREF, "LOCAL_PREF" },
{ BGP_ATTR_ATOMIC_AGGREGATE, "ATOMIC_AGGREGATE" },
{ BGP_ATTR_AGGREGATOR, "AGGREGATOR" },
{ BGP_ATTR_COMMUNITIES, "COMMUNITY" },
{ BGP_ATTR_ORIGINATOR_ID, "ORIGINATOR_ID" },
{ BGP_ATTR_CLUSTER_LIST, "CLUSTER_LIST" },
{ BGP_ATTR_DPA, "DPA" },
{ BGP_ATTR_ADVERTISER, "ADVERTISER"} ,
{ BGP_ATTR_RCID_PATH, "RCID_PATH" },
{ BGP_ATTR_MP_REACH_NLRI, "MP_REACH_NLRI" },
{ BGP_ATTR_MP_UNREACH_NLRI, "MP_UNREACH_NLRI" },
{ BGP_ATTR_EXT_COMMUNITIES, "EXT_COMMUNITIES" },
{ BGP_ATTR_AS4_PATH, "AS4_PATH" },
{ BGP_ATTR_AS4_AGGREGATOR, "AS4_AGGREGATOR" },
{ BGP_ATTR_AS_PATHLIMIT, "AS_PATHLIMIT" },
};
static const int attr_str_max = sizeof(attr_str)/sizeof(attr_str[0]);
static struct hash *cluster_hash;
static void *
cluster_hash_alloc (void *p)
{
struct cluster_list * val = (struct cluster_list *) p;
struct cluster_list *cluster;
cluster = XMALLOC (MTYPE_CLUSTER, sizeof (struct cluster_list));
cluster->length = val->length;
if (cluster->length)
{
cluster->list = XMALLOC (MTYPE_CLUSTER_VAL, val->length);
memcpy (cluster->list, val->list, val->length);
}
else
cluster->list = NULL;
cluster->refcnt = 0;
return cluster;
}
/* Cluster list related functions. */
static struct cluster_list *
cluster_parse (struct in_addr * pnt, int length)
{
struct cluster_list tmp;
struct cluster_list *cluster;
tmp.length = length;
tmp.list = pnt;
cluster = hash_get (cluster_hash, &tmp, cluster_hash_alloc);
cluster->refcnt++;
return cluster;
}
int
cluster_loop_check (struct cluster_list *cluster, struct in_addr originator)
{
int i;
for (i = 0; i < cluster->length / 4; i++)
if (cluster->list[i].s_addr == originator.s_addr)
return 1;
return 0;
}
static unsigned int
cluster_hash_key_make (void *p)
{
struct cluster_list * cluster = (struct cluster_list *) p;
unsigned int key = 0;
int length;
caddr_t pnt;
length = cluster->length;
pnt = (caddr_t) cluster->list;
while (length)
key += pnt[--length];
return key;
}
static int
cluster_hash_cmp (const void *p1, const void *p2)
{
const struct cluster_list * cluster1 = p1;
const struct cluster_list * cluster2 = p2;
return (cluster1->length == cluster2->length &&
memcmp (cluster1->list, cluster2->list, cluster1->length) == 0);
}
static void
cluster_free (struct cluster_list *cluster)
{
if (cluster->list)
XFREE (MTYPE_CLUSTER_VAL, cluster->list);
XFREE (MTYPE_CLUSTER, cluster);
}
#if 0
static struct cluster_list *
cluster_dup (struct cluster_list *cluster)
{
struct cluster_list *new;
new = XCALLOC (MTYPE_CLUSTER, sizeof (struct cluster_list));
new->length = cluster->length;
if (cluster->length)
{
new->list = XMALLOC (MTYPE_CLUSTER_VAL, cluster->length);
memcpy (new->list, cluster->list, cluster->length);
}
else
new->list = NULL;
return new;
}
#endif
static struct cluster_list *
cluster_intern (struct cluster_list *cluster)
{
struct cluster_list *find;
find = hash_get (cluster_hash, cluster, cluster_hash_alloc);
find->refcnt++;
return find;
}
void
cluster_unintern (struct cluster_list *cluster)
{
struct cluster_list *ret;
if (cluster->refcnt)
cluster->refcnt--;
if (cluster->refcnt == 0)
{
ret = hash_release (cluster_hash, cluster);
cluster_free (cluster);
}
}
static void
cluster_init (void)
{
cluster_hash = hash_create (cluster_hash_key_make, cluster_hash_cmp);
}
static void
cluster_finish (void)
{
hash_free (cluster_hash);
cluster_hash = NULL;
}
/* Unknown transit attribute. */
static struct hash *transit_hash;
static void
transit_free (struct transit *transit)
{
if (transit->val)
XFREE (MTYPE_TRANSIT_VAL, transit->val);
XFREE (MTYPE_TRANSIT, transit);
}
static void *
transit_hash_alloc (void *p)
{
/* Transit structure is already allocated. */
return p;
}
static struct transit *
transit_intern (struct transit *transit)
{
struct transit *find;
find = hash_get (transit_hash, transit, transit_hash_alloc);
if (find != transit)
transit_free (transit);
find->refcnt++;
return find;
}
void
transit_unintern (struct transit *transit)
{
struct transit *ret;
if (transit->refcnt)
transit->refcnt--;
if (transit->refcnt == 0)
{
ret = hash_release (transit_hash, transit);
transit_free (transit);
}
}
static unsigned int
transit_hash_key_make (void *p)
{
struct transit * transit = (struct transit *) p;
unsigned int key = 0;
int length;
caddr_t pnt;
length = transit->length;
pnt = (caddr_t) transit->val;
while (length)
key += pnt[--length];
return key;
}
static int
transit_hash_cmp (const void *p1, const void *p2)
{
const struct transit * transit1 = p1;
const struct transit * transit2 = p2;
return (transit1->length == transit2->length &&
memcmp (transit1->val, transit2->val, transit1->length) == 0);
}
static void
transit_init (void)
{
transit_hash = hash_create (transit_hash_key_make, transit_hash_cmp);
}
static void
transit_finish (void)
{
hash_free (transit_hash);
transit_hash = NULL;
}
/* Attribute hash routines. */
static struct hash *attrhash;
static struct attr_extra *
bgp_attr_extra_new (void)
{
return XCALLOC (MTYPE_ATTR_EXTRA, sizeof (struct attr_extra));
}
void
bgp_attr_extra_free (struct attr *attr)
{
if (attr->extra)
{
XFREE (MTYPE_ATTR_EXTRA, attr->extra);
attr->extra = NULL;
}
}
struct attr_extra *
bgp_attr_extra_get (struct attr *attr)
{
if (!attr->extra)
attr->extra = bgp_attr_extra_new();
return attr->extra;
}
/* Shallow copy of an attribute
* Though, not so shallow that it doesn't copy the contents
* of the attr_extra pointed to by 'extra'
*/
void
bgp_attr_dup (struct attr *new, struct attr *orig)
{
*new = *orig;
if (orig->extra)
{
new->extra = bgp_attr_extra_new();
*new->extra = *orig->extra;
}
}
unsigned long int
attr_count (void)
{
return attrhash->count;
}
unsigned long int
attr_unknown_count (void)
{
return transit_hash->count;
}
unsigned int
attrhash_key_make (void *p)
{
struct attr * attr = (struct attr *) p;
unsigned int key = 0;
key += attr->origin;
key += attr->nexthop.s_addr;
key += attr->med;
key += attr->local_pref;
if (attr->extra)
{
key += attr->extra->aggregator_as;
key += attr->extra->aggregator_addr.s_addr;
key += attr->extra->weight;
key += attr->extra->mp_nexthop_global_in.s_addr;
}
if (attr->aspath)
key += aspath_key_make (attr->aspath);
if (attr->community)
key += community_hash_make (attr->community);
if (attr->extra)
{
if (attr->extra->ecommunity)
key += ecommunity_hash_make (attr->extra->ecommunity);
if (attr->extra->cluster)
key += cluster_hash_key_make (attr->extra->cluster);
if (attr->extra->transit)
key += transit_hash_key_make (attr->extra->transit);
#ifdef HAVE_IPV6
{
int i;
key += attr->extra->mp_nexthop_len;
for (i = 0; i < 16; i++)
key += attr->extra->mp_nexthop_global.s6_addr[i];
for (i = 0; i < 16; i++)
key += attr->extra->mp_nexthop_local.s6_addr[i];
}
#endif /* HAVE_IPV6 */
}
return key;
}
int
attrhash_cmp (const void *p1, const void *p2)
{
const struct attr * attr1 = p1;
const struct attr * attr2 = p2;
if (attr1->flag == attr2->flag
&& attr1->origin == attr2->origin
&& attr1->nexthop.s_addr == attr2->nexthop.s_addr
&& attr1->aspath == attr2->aspath
&& attr1->community == attr2->community
&& attr1->med == attr2->med
&& attr1->local_pref == attr2->local_pref)
{
const struct attr_extra *ae1 = attr1->extra;
const struct attr_extra *ae2 = attr2->extra;
if (ae1 && ae2
&& ae1->aggregator_as == ae2->aggregator_as
&& ae1->aggregator_addr.s_addr == ae2->aggregator_addr.s_addr
&& ae1->weight == ae2->weight
#ifdef HAVE_IPV6
&& ae1->mp_nexthop_len == ae2->mp_nexthop_len
&& IPV6_ADDR_SAME (&ae1->mp_nexthop_global, &ae2->mp_nexthop_global)
&& IPV6_ADDR_SAME (&ae1->mp_nexthop_local, &ae2->mp_nexthop_local)
#endif /* HAVE_IPV6 */
&& IPV4_ADDR_SAME (&ae1->mp_nexthop_global_in, &ae2->mp_nexthop_global_in)
&& ae1->ecommunity == ae2->ecommunity
&& ae1->cluster == ae2->cluster
&& ae1->transit == ae2->transit)
return 1;
else if (ae1 || ae2)
return 0;
/* neither attribute has extra attributes, so they're same */
return 1;
}
else
return 0;
}
static void
attrhash_init (void)
{
attrhash = hash_create (attrhash_key_make, attrhash_cmp);
}
static void
attrhash_finish (void)
{
hash_free (attrhash);
attrhash = NULL;
}
static void
attr_show_all_iterator (struct hash_backet *backet, struct vty *vty)
{
struct attr *attr = backet->data;
vty_out (vty, "attr[%ld] nexthop %s%s", attr->refcnt,
inet_ntoa (attr->nexthop), VTY_NEWLINE);
}
void
attr_show_all (struct vty *vty)
{
hash_iterate (attrhash,
(void (*)(struct hash_backet *, void *))
attr_show_all_iterator,
vty);
}
static void *
bgp_attr_hash_alloc (void *p)
{
struct attr * val = (struct attr *) p;
struct attr *attr;
attr = XMALLOC (MTYPE_ATTR, sizeof (struct attr));
*attr = *val;
if (val->extra)
{
attr->extra = bgp_attr_extra_new ();
*attr->extra = *val->extra;
}
attr->refcnt = 0;
return attr;
}
/* Internet argument attribute. */
struct attr *
bgp_attr_intern (struct attr *attr)
{
struct attr *find;
/* Intern referenced strucutre. */
if (attr->aspath)
{
if (! attr->aspath->refcnt)
attr->aspath = aspath_intern (attr->aspath);
else
attr->aspath->refcnt++;
}
if (attr->community)
{
if (! attr->community->refcnt)
attr->community = community_intern (attr->community);
else
attr->community->refcnt++;
}
if (attr->extra)
{
struct attr_extra *attre = attr->extra;
if (attre->ecommunity)
{
if (! attre->ecommunity->refcnt)
attre->ecommunity = ecommunity_intern (attre->ecommunity);
else
attre->ecommunity->refcnt++;
}
if (attre->cluster)
{
if (! attre->cluster->refcnt)
attre->cluster = cluster_intern (attre->cluster);
else
attre->cluster->refcnt++;
}
if (attre->transit)
{
if (! attre->transit->refcnt)
attre->transit = transit_intern (attre->transit);
else
attre->transit->refcnt++;
}
}
find = (struct attr *) hash_get (attrhash, attr, bgp_attr_hash_alloc);
find->refcnt++;
return find;
}
/* Make network statement's attribute. */
struct attr *
bgp_attr_default_set (struct attr *attr, u_char origin)
{
memset (attr, 0, sizeof (struct attr));
bgp_attr_extra_get (attr);
attr->origin = origin;
attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGIN);
attr->aspath = aspath_empty ();
attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS_PATH);
attr->extra->weight = BGP_ATTR_DEFAULT_WEIGHT;
attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP);
#ifdef HAVE_IPV6
attr->extra->mp_nexthop_len = IPV6_MAX_BYTELEN;
#endif
return attr;
}
/* Make network statement's attribute. */
struct attr *
bgp_attr_default_intern (u_char origin)
{
struct attr attr;
struct attr *new;
struct attr_extra *attre;
memset (&attr, 0, sizeof (struct attr));
attre = bgp_attr_extra_get (&attr);
bgp_attr_default_set(&attr, origin);
new = bgp_attr_intern (&attr);
bgp_attr_extra_free (&attr);
aspath_unintern (new->aspath);
return new;
}
struct attr *
bgp_attr_aggregate_intern (struct bgp *bgp, u_char origin,
struct aspath *aspath,
struct community *community, int as_set)
{
struct attr attr;
struct attr *new;
struct attr_extra *attre;
memset (&attr, 0, sizeof (struct attr));
attre = bgp_attr_extra_get (&attr);
/* Origin attribute. */
attr.origin = origin;
attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGIN);
/* AS path attribute. */
if (aspath)
attr.aspath = aspath_intern (aspath);
else
attr.aspath = aspath_empty ();
attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_AS_PATH);
/* Next hop attribute. */
attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP);
if (community)
{
attr.community = community;
attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES);
}
attre->weight = BGP_ATTR_DEFAULT_WEIGHT;
#ifdef HAVE_IPV6
attre->mp_nexthop_len = IPV6_MAX_BYTELEN;
#endif
if (! as_set)
attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE);
attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR);
if (CHECK_FLAG (bgp->config, BGP_CONFIG_CONFEDERATION))
attre->aggregator_as = bgp->confed_id;
else
attre->aggregator_as = bgp->as;
attre->aggregator_addr = bgp->router_id;
new = bgp_attr_intern (&attr);
bgp_attr_extra_free (&attr);
aspath_unintern (new->aspath);
return new;
}
/* Free bgp attribute and aspath. */
void
bgp_attr_unintern (struct attr *attr)
{
struct attr *ret;
struct aspath *aspath;
struct community *community;
struct ecommunity *ecommunity = NULL;
struct cluster_list *cluster = NULL;
struct transit *transit = NULL;
/* Decrement attribute reference. */
attr->refcnt--;
aspath = attr->aspath;
community = attr->community;
if (attr->extra)
{
ecommunity = attr->extra->ecommunity;
cluster = attr->extra->cluster;
transit = attr->extra->transit;
}
/* If reference becomes zero then free attribute object. */
if (attr->refcnt == 0)
{
ret = hash_release (attrhash, attr);
assert (ret != NULL);
bgp_attr_extra_free (attr);
XFREE (MTYPE_ATTR, attr);
}
/* aspath refcount shoud be decrement. */
if (aspath)
aspath_unintern (aspath);
if (community)
community_unintern (community);
if (ecommunity)
ecommunity_unintern (ecommunity);
if (cluster)
cluster_unintern (cluster);
if (transit)
transit_unintern (transit);
}
void
bgp_attr_flush (struct attr *attr)
{
if (attr->aspath && ! attr->aspath->refcnt)
aspath_free (attr->aspath);
if (attr->community && ! attr->community->refcnt)
community_free (attr->community);
if (attr->extra)
{
struct attr_extra *attre = attr->extra;
if (attre->ecommunity && ! attre->ecommunity->refcnt)
ecommunity_free (attre->ecommunity);
if (attre->cluster && ! attre->cluster->refcnt)
cluster_free (attre->cluster);
if (attre->transit && ! attre->transit->refcnt)
transit_free (attre->transit);
}
}
/* Get origin attribute of the update message. */
static int
bgp_attr_origin (struct peer *peer, bgp_size_t length,
struct attr *attr, u_char flag, u_char *startp)
{
bgp_size_t total;
/* total is entire attribute length include Attribute Flags (1),
Attribute Type code (1) and Attribute length (1 or 2). */
total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3);
/* If any recognized attribute has Attribute Flags that conflict
with the Attribute Type Code, then the Error Subcode is set to
Attribute Flags Error. The Data field contains the erroneous
attribute (type, length and value). */
if ((flag & ~BGP_ATTR_FLAG_EXTLEN) != BGP_ATTR_FLAG_TRANS)
{
if (CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL))
zlog (peer->log, LOG_ERR, "ORIGIN attribute must not be flagged as \"optional\" (%u)", flag);
if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS))
zlog (peer->log, LOG_ERR, "ORIGIN attribute must be flagged as \"transitive\" (%u)", flag);
if (CHECK_FLAG (flag, BGP_ATTR_FLAG_PARTIAL))
zlog (peer->log, LOG_ERR, "ORIGIN attribute must not be flagged as \"partial\" (%u)", flag);
bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, startp, total);
return -1;
}
/* If any recognized attribute has Attribute Length that conflicts
with the expected length (based on the attribute type code), then
the Error Subcode is set to Attribute Length Error. The Data
field contains the erroneous attribute (type, length and
value). */
if (length != 1)
{
zlog (peer->log, LOG_ERR, "Origin attribute length is not one %d",
length);
bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
startp, total);
return -1;
}
/* Fetch origin attribute. */
attr->origin = stream_getc (BGP_INPUT (peer));
/* If the ORIGIN attribute has an undefined value, then the Error
Subcode is set to Invalid Origin Attribute. The Data field
contains the unrecognized attribute (type, length and value). */
if ((attr->origin != BGP_ORIGIN_IGP)
&& (attr->origin != BGP_ORIGIN_EGP)
&& (attr->origin != BGP_ORIGIN_INCOMPLETE))
{
zlog (peer->log, LOG_ERR, "Origin attribute value is invalid %d",
attr->origin);
bgp_notify_send_with_data (peer,
BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_INVAL_ORIGIN,
startp, total);
return -1;
}
/* Set oring attribute flag. */
attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGIN);
return 0;
}
/* Parse AS path information. This function is wrapper of aspath_parse.
*
* Parses AS_PATH or AS4_PATH.
*
* Returns: if valid: address of struct aspath in the hash of known aspaths,
* with reference count incremented.
* else: NULL
*
* NB: empty AS path (length == 0) is valid. The returned struct aspath will
* have segments == NULL and str == zero length string (unique).
*/
static struct aspath *
bgp_attr_aspath (struct peer *peer, bgp_size_t length,
struct attr *attr, u_char flag, u_char *startp, int as4_path)
{
u_char require ;
struct aspath *asp ;
bgp_size_t total;
total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3);
/* Check the attribute flags */
if (CHECK_FLAG (flag, BGP_ATTR_FLAG_PARTIAL))
{
zlog (peer->log, LOG_ERR,
"AS_PATH attribute must not be flagged as \"partial\" (%u)", flag);
bgp_notify_send_with_data (peer,
BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR,
startp, total);
return NULL;
}
require = as4_path ? BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS
: BGP_ATTR_FLAG_TRANS ;
if ((flag & (BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS)) != require)
{
const char* path_type ;
path_type = as4_path ? "AS4_PATH" : "AS_PATH" ;
if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS))
zlog (peer->log, LOG_ERR,
"%s attribute flag isn't transitive %d", path_type, flag) ;
if ((flag & BGP_ATTR_FLAG_OPTIONAL) != (require & BGP_ATTR_FLAG_OPTIONAL))
zlog (peer->log, LOG_ERR,
"%s attribute flag must %sbe optional %d", path_type,
(flag & BGP_ATTR_FLAG_OPTIONAL) ? "not " : "", flag) ;
bgp_notify_send_with_data (peer,
BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR,
startp, total);
return NULL ;
} ;
/* Parse the AS_PATH/AS4_PATH body.
*
* For AS_PATH peer with AS4 => 4Byte ASN otherwise 2Byte ASN
* AS4_PATH 4Byte ASN
*/
asp = aspath_parse (peer->ibuf, length,
as4_path || CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV), as4_path) ;
if (asp != NULL)
{
attr->flag |= ATTR_FLAG_BIT (as4_path ? BGP_ATTR_AS4_PATH
: BGP_ATTR_AS_PATH) ;
}
else
{
zlog (peer->log, LOG_ERR, "Malformed AS path length is %d", length);
/* TODO: should BGP_NOTIFY_UPDATE_MAL_AS_PATH be sent for AS4_PATH ?? */
bgp_notify_send (peer,
BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_MAL_AS_PATH);
} ;
return asp ;
}
static int bgp_attr_aspath_check( struct peer *peer,
struct attr *attr)
{
/* These checks were part of bgp_attr_aspath, but with
* as4 we should to check aspath things when
* aspath synthesizing with as4_path has already taken place.
* Otherwise we check ASPATH and use the synthesized thing, and that is
* not right.
* So do the checks later, i.e. here
*/
struct bgp *bgp = peer->bgp;
struct aspath *aspath;
bgp = peer->bgp;
/* Confederation sanity check. */
if ((peer_sort (peer) == BGP_PEER_CONFED && ! aspath_left_confed_check (attr->aspath)) ||
(peer_sort (peer) == BGP_PEER_EBGP && aspath_confed_check (attr->aspath)))
{
zlog (peer->log, LOG_ERR, "Malformed AS path from %s", peer->host);
bgp_notify_send (peer,
BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_MAL_AS_PATH);
return -1;
}
/* First AS check for EBGP. */
if (bgp != NULL && bgp_flag_check (bgp, BGP_FLAG_ENFORCE_FIRST_AS))
{
if (peer_sort (peer) == BGP_PEER_EBGP
&& ! aspath_firstas_check (attr->aspath, peer->as))
{
zlog (peer->log, LOG_ERR,
"%s incorrect first AS (must be %u)", peer->host, peer->as);
bgp_notify_send (peer,
BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_MAL_AS_PATH);
return -1;
}
}
/* local-as prepend */
if (peer->change_local_as &&
! CHECK_FLAG (peer->flags, PEER_FLAG_LOCAL_AS_NO_PREPEND))
{
aspath = aspath_dup (attr->aspath);
aspath = aspath_add_seq (aspath, peer->change_local_as);
aspath_unintern (attr->aspath);
attr->aspath = aspath_intern (aspath);
}
return 0;
}
/* Nexthop attribute. */
static int
bgp_attr_nexthop (struct peer *peer, bgp_size_t length,
struct attr *attr, u_char flag, u_char *startp)
{
bgp_size_t total;
in_addr_t nexthop_h, nexthop_n;
total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3);
/* Flags check. */
if ((flag & ~BGP_ATTR_FLAG_EXTLEN) != BGP_ATTR_FLAG_TRANS)
{
if (CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL))
zlog (peer->log, LOG_ERR, "NEXT_HOP attribute must not be flagged as \"optional\" (%u)", flag);
if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS))
zlog (peer->log, LOG_ERR, "NEXT_HOP attribute must be flagged as \"transitive\" (%u)", flag);
if (CHECK_FLAG (flag, BGP_ATTR_FLAG_PARTIAL))
zlog (peer->log, LOG_ERR, "NEXT_HOP attribute must not be flagged as \"partial\" (%u)", flag);
bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, startp, total);
return -1;
}
/* Check nexthop attribute length. */
if (length != 4)
{
zlog (peer->log, LOG_ERR, "Nexthop attribute length isn't four [%d]",
length);
bgp_notify_send_with_data (peer,
BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
startp, total);
return -1;
}
/* According to section 6.3 of RFC4271, syntactically incorrect NEXT_HOP
attribute must result in a NOTIFICATION message (this is implemented below).
At the same time, semantically incorrect NEXT_HOP is more likely to be just
logged locally (this is implemented somewhere else). The UPDATE message
gets ignored in any of these cases. */
nexthop_n = stream_get_ipv4 (peer->ibuf);
nexthop_h = ntohl (nexthop_n);
if (IPV4_NET0 (nexthop_h) || IPV4_NET127 (nexthop_h) || IPV4_CLASS_DE (nexthop_h))
{
char buf[INET_ADDRSTRLEN];
inet_ntop (AF_INET, &nexthop_h, buf, INET_ADDRSTRLEN);
zlog (peer->log, LOG_ERR, "Martian nexthop %s", buf);
bgp_notify_send_with_data (peer,
BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_INVAL_NEXT_HOP,
startp, total);
return -1;
}
attr->nexthop.s_addr = nexthop_n;
attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP);
return 0;
}
/* MED atrribute. */
static int
bgp_attr_med (struct peer *peer, bgp_size_t length,
struct attr *attr, u_char flag, u_char *startp)
{
bgp_size_t total;
total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3);
/* Flag checks. */
if ((flag & ~BGP_ATTR_FLAG_EXTLEN) != BGP_ATTR_FLAG_OPTIONAL)
{
if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL))
zlog (peer->log, LOG_ERR, "MULTI_EXIT_DISC attribute must be flagged as \"optional\" (%u)", flag);
if (CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS))
zlog (peer->log, LOG_ERR, "MULTI_EXIT_DISC attribute must not be flagged as \"transitive\" (%u)", flag);
if (CHECK_FLAG (flag, BGP_ATTR_FLAG_PARTIAL))
zlog (peer->log, LOG_ERR, "MULTI_EXIT_DISC attribute must not be flagged as \"partial\" (%u)", flag);
bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, startp, total);
return -1;
}
/* Length check. */
if (length != 4)
{
zlog (peer->log, LOG_ERR,
"MED attribute length isn't four [%d]", length);
bgp_notify_send_with_data (peer,
BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
startp, total);
return -1;
}
attr->med = stream_getl (peer->ibuf);
attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC);
return 0;
}
/* Local preference attribute. */
static int
bgp_attr_local_pref (struct peer *peer, bgp_size_t length,
struct attr *attr, u_char flag, u_char *startp)
{
bgp_size_t total;
total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3);
/* Flag checks. */
if ((flag & ~BGP_ATTR_FLAG_EXTLEN) != BGP_ATTR_FLAG_TRANS)
{
if (CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL))
zlog (peer->log, LOG_ERR, "LOCAL_PREF attribute must not be flagged as \"optional\" (%u)", flag);
if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS))
zlog (peer->log, LOG_ERR, "LOCAL_PREF attribute must be flagged as \"transitive\" (%u)", flag);
if (CHECK_FLAG (flag, BGP_ATTR_FLAG_PARTIAL))
zlog (peer->log, LOG_ERR, "LOCAL_PREF attribute must not be flagged as \"partial\" (%u)", flag);
bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, startp, total);
return -1;
}
/* If it is contained in an UPDATE message that is received from an
external peer, then this attribute MUST be ignored by the
receiving speaker. */
if (peer_sort (peer) == BGP_PEER_EBGP)
{
stream_forward_getp (peer->ibuf, length);
return 0;
}
if (length == 4)
attr->local_pref = stream_getl (peer->ibuf);
else
attr->local_pref = 0;
/* Set atomic aggregate flag. */
attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_LOCAL_PREF);
return 0;
}
/* Atomic aggregate. */
static int
bgp_attr_atomic (struct peer *peer, bgp_size_t length,
struct attr *attr, u_char flag, u_char *startp)
{
bgp_size_t total;
total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3);
/* Flag checks. */
if ((flag & ~BGP_ATTR_FLAG_EXTLEN) != BGP_ATTR_FLAG_TRANS)
{
if (CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL))
zlog (peer->log, LOG_ERR, "ATOMIC_AGGREGATE attribute must not be flagged as \"optional\" (%u)", flag);
if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS))
zlog (peer->log, LOG_ERR, "ATOMIC_AGGREGATE attribute must be flagged as \"transitive\" (%u)", flag);
if (CHECK_FLAG (flag, BGP_ATTR_FLAG_PARTIAL))
zlog (peer->log, LOG_ERR, "ATOMIC_AGGREGATE attribute must not be flagged as \"partial\" (%u)", flag);
bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, startp, total);
return -1;
}
/* Length check. */
if (length != 0)
{
zlog (peer->log, LOG_ERR, "Bad atomic aggregate length %d", length);
bgp_notify_send (peer,
BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_ATTR_LENG_ERR);
return -1;
}
/* Set atomic aggregate flag. */
attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE);
return 0;
}
/* Aggregator attribute */
static int
bgp_attr_aggregator (struct peer *peer, bgp_size_t length,
struct attr *attr, u_char flag)
{
int wantedlen = 6;
struct attr_extra *attre = bgp_attr_extra_get (attr);
/* peer with AS4 will send 4 Byte AS, peer without will send 2 Byte */
if ( CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV ) )
wantedlen = 8;
if (length != wantedlen)
{
zlog (peer->log, LOG_ERR, "Aggregator length is not %d [%d]", wantedlen, length);
bgp_notify_send (peer,
BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_ATTR_LENG_ERR);
return -1;
}
if ( CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV ) )
attre->aggregator_as = stream_getl (peer->ibuf);
else
attre->aggregator_as = stream_getw (peer->ibuf);
attre->aggregator_addr.s_addr = stream_get_ipv4 (peer->ibuf);
/* Set atomic aggregate flag. */
attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR);
return 0;
}
/* New Aggregator attribute */
static int
bgp_attr_as4_aggregator (struct peer *peer, bgp_size_t length,
struct attr *attr, as_t *as4_aggregator_as,
struct in_addr *as4_aggregator_addr)
{
if (length != 8)
{
zlog (peer->log, LOG_ERR, "New Aggregator length is not 8 [%d]", length);
bgp_notify_send (peer,
BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_ATTR_LENG_ERR);
return -1;
}
*as4_aggregator_as = stream_getl (peer->ibuf);
as4_aggregator_addr->s_addr = stream_get_ipv4 (peer->ibuf);
attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_AS4_AGGREGATOR);
return 0;
}
/* Munge Aggregator and New-Aggregator, AS_PATH and NEW_AS_PATH.
*/
static int
bgp_attr_munge_as4_attrs (struct peer *peer, struct attr *attr,
struct aspath *as4_path, as_t as4_aggregator,
struct in_addr *as4_aggregator_addr)
{
int ignore_as4_path = 0;
struct aspath *newpath;
struct attr_extra *attre = attr->extra;
if ( CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV) )
{
/* peer can do AS4, so we ignore AS4_PATH and AS4_AGGREGATOR
* if given.
* It is worth a warning though, because the peer really
* should not send them
*/
if (BGP_DEBUG(as4, AS4))
{
if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH)))
zlog_debug ("[AS4] %s %s AS4_PATH",
peer->host, "AS4 capable peer, yet it sent");
if (attr->flag & (ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR)))
zlog_debug ("[AS4] %s %s AS4_AGGREGATOR",
peer->host, "AS4 capable peer, yet it sent");
}
return 0;
}
if (attr->flag & ( ATTR_FLAG_BIT( BGP_ATTR_AS4_PATH))
&& !(attr->flag & ( ATTR_FLAG_BIT( BGP_ATTR_AS_PATH))))
{
/* Hu? This is not supposed to happen at all!
* got as4_path and no aspath,
* This should already
* have been handled by 'well known attributes missing'
* But... yeah, paranoia
* Take this as a "malformed attribute"
*/
zlog (peer->log, LOG_ERR,
"%s BGP not AS4 capable peer sent AS4_PATH but"
" no AS_PATH, cant do anything here", peer->host);
bgp_notify_send (peer,
BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_MAL_ATTR);
return -1;
}
/* We have a asn16 peer. First, look for AS4_AGGREGATOR
* because that may override AS4_PATH
*/
if (attr->flag & (ATTR_FLAG_BIT (BGP_ATTR_AS4_AGGREGATOR) ) )
{
if ( attr->flag & (ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR) ) )
{
assert (attre);
/* received both.
* if the as_number in aggregator is not AS_TRANS,
* then AS4_AGGREGATOR and AS4_PATH shall be ignored
* and the Aggregator shall be taken as
* info on the aggregating node, and the AS_PATH
* shall be taken as the AS_PATH
* otherwise
* the Aggregator shall be ignored and the
* AS4_AGGREGATOR shall be taken as the
* Aggregating node and the AS_PATH is to be
* constructed "as in all other cases"
*/
if ( attre->aggregator_as != BGP_AS_TRANS )
{
/* ignore */
if ( BGP_DEBUG(as4, AS4))
zlog_debug ("[AS4] %s BGP not AS4 capable peer"
" send AGGREGATOR != AS_TRANS and"
" AS4_AGGREGATOR, so ignore"
" AS4_AGGREGATOR and AS4_PATH", peer->host);
ignore_as4_path = 1;
}
else
{
/* "New_aggregator shall be taken as aggregator" */
attre->aggregator_as = as4_aggregator;
attre->aggregator_addr.s_addr = as4_aggregator_addr->s_addr;
}
}
else
{
/* We received a AS4_AGGREGATOR but no AGGREGATOR.
* That is bogus - but reading the conditions
* we have to handle AS4_AGGREGATOR as if it were
* AGGREGATOR in that case
*/
if ( BGP_DEBUG(as4, AS4))
zlog_debug ("[AS4] %s BGP not AS4 capable peer send"
" AS4_AGGREGATOR but no AGGREGATOR, will take"
" it as if AGGREGATOR with AS_TRANS had been there", peer->host);
(attre = bgp_attr_extra_get (attr))->aggregator_as = as4_aggregator;
/* sweep it under the carpet and simulate a "good" AGGREGATOR */
attr->flag |= (ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR));
}
}
/* need to reconcile NEW_AS_PATH and AS_PATH */
if ( !ignore_as4_path && (attr->flag & ( ATTR_FLAG_BIT( BGP_ATTR_AS4_PATH))) )
{
newpath = aspath_reconcile_as4 (attr->aspath, as4_path);
aspath_unintern (attr->aspath);
attr->aspath = aspath_intern (newpath);
}
return 0;
}
/* Community attribute. */
static int
bgp_attr_community (struct peer *peer, bgp_size_t length,
struct attr *attr, u_char flag)
{
if (length == 0)
{
attr->community = NULL;
return 0;
}
attr->community =
community_parse ((u_int32_t *)stream_pnt (peer->ibuf), length);
/* XXX: fix community_parse to use stream API and remove this */
stream_forward_getp (peer->ibuf, length);
if (!attr->community)
return -1;
attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES);
return 0;
}
/* Originator ID attribute. */
static int
bgp_attr_originator_id (struct peer *peer, bgp_size_t length,
struct attr *attr, u_char flag, u_char *startp)
{
bgp_size_t total;
total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3);
/* Flag checks. */
if (flag != BGP_ATTR_FLAG_OPTIONAL)
{
if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL))
zlog (peer->log, LOG_ERR, "ORIGINATOR_ID attribute must be flagged as \"optional\" (%u)", flag);
if (CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS))
zlog (peer->log, LOG_ERR, "ORIGINATOR_ID attribute must not be flagged as \"transitive\" (%u)", flag);
if (CHECK_FLAG (flag, BGP_ATTR_FLAG_PARTIAL))
zlog (peer->log, LOG_ERR, "ORIGINATOR_ID attribute must not be flagged as \"partial\" (%u)", flag);
bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, startp, total);
return -1;
}
/* Length check. */
if (length != 4)
{
zlog (peer->log, LOG_ERR, "Bad originator ID length %d", length);
bgp_notify_send (peer,
BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_ATTR_LENG_ERR);
return -1;
}
(bgp_attr_extra_get (attr))->originator_id.s_addr
= stream_get_ipv4 (peer->ibuf);
attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_ORIGINATOR_ID);
return 0;
}
/* Cluster list attribute. */
static int
bgp_attr_cluster_list (struct peer *peer, bgp_size_t length,
struct attr *attr, u_char flag, u_char *startp)
{
bgp_size_t total;
total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3);
/* Flag checks. */
if (flag != BGP_ATTR_FLAG_OPTIONAL)
{
if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL))
zlog (peer->log, LOG_ERR, "CLUSTER_LIST attribute must be flagged as \"optional\" (%u)", flag);
if (CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS))
zlog (peer->log, LOG_ERR, "CLUSTER_LIST attribute must not be flagged as \"transitive\" (%u)", flag);
if (CHECK_FLAG (flag, BGP_ATTR_FLAG_PARTIAL))
zlog (peer->log, LOG_ERR, "CLUSTER_LIST attribute must not be flagged as \"partial\" (%u)", flag);
bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, startp, total);
return -1;
}
/* Check length. */
if (length % 4)
{
zlog (peer->log, LOG_ERR, "Bad cluster list length %d", length);
bgp_notify_send (peer,
BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_ATTR_LENG_ERR);
return -1;
}
(bgp_attr_extra_get (attr))->cluster
= cluster_parse ((struct in_addr *)stream_pnt (peer->ibuf), length);
stream_forward_getp (peer->ibuf, length);;
attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_CLUSTER_LIST);
return 0;
}
/* Multiprotocol reachability information parse. */
int
bgp_mp_reach_parse (struct peer *peer, bgp_size_t length, struct attr *attr,
struct bgp_nlri *mp_update)
{
afi_t afi;
safi_t safi;
bgp_size_t nlri_len;
size_t start;
int ret;
struct stream *s;
struct attr_extra *attre = bgp_attr_extra_get(attr);
/* Set end of packet. */
s = BGP_INPUT(peer);
start = stream_get_getp(s);
/* safe to read statically sized header? */
#define BGP_MP_REACH_MIN_SIZE 5
#define LEN_LEFT (length - (stream_get_getp(s) - start))
if ((length > STREAM_READABLE(s)) || (length < BGP_MP_REACH_MIN_SIZE))
{
zlog_info ("%s: %s sent invalid length, %lu",
__func__, peer->host, (unsigned long)length);
return -1;
}
/* Load AFI, SAFI. */
afi = stream_getw (s);
safi = stream_getc (s);
/* Get nexthop length. */
attre->mp_nexthop_len = stream_getc (s);
if (LEN_LEFT < attre->mp_nexthop_len)
{
zlog_info ("%s: %s, MP nexthop length, %u, goes past end of attribute",
__func__, peer->host, attre->mp_nexthop_len);
return -1;
}
/* Nexthop length check. */
switch (attre->mp_nexthop_len)
{
case 4:
stream_get (&attre->mp_nexthop_global_in, s, 4);
/* Probably needed for RFC 2283 */
if (attr->nexthop.s_addr == 0)
memcpy(&attr->nexthop.s_addr, &attre->mp_nexthop_global_in, 4);
break;
case 12:
{
u_int32_t rd_high;
u_int32_t rd_low;
rd_high = stream_getl (s);
rd_low = stream_getl (s);
stream_get (&attre->mp_nexthop_global_in, s, 4);
}
break;
#ifdef HAVE_IPV6
case 16:
stream_get (&attre->mp_nexthop_global, s, 16);
break;
case 32:
stream_get (&attre->mp_nexthop_global, s, 16);
stream_get (&attre->mp_nexthop_local, s, 16);
if (! IN6_IS_ADDR_LINKLOCAL (&attre->mp_nexthop_local))
{
char buf1[INET6_ADDRSTRLEN];
char buf2[INET6_ADDRSTRLEN];
if (BGP_DEBUG (update, UPDATE_IN))
zlog_debug ("%s got two nexthop %s %s but second one is not a link-local nexthop", peer->host,
inet_ntop (AF_INET6, &attre->mp_nexthop_global,
buf1, INET6_ADDRSTRLEN),
inet_ntop (AF_INET6, &attre->mp_nexthop_local,
buf2, INET6_ADDRSTRLEN));
attre->mp_nexthop_len = 16;
}
break;
#endif /* HAVE_IPV6 */
default:
zlog_info ("%s: (%s) Wrong multiprotocol next hop length: %d",
__func__, peer->host, attre->mp_nexthop_len);
return -1;
}
if (!LEN_LEFT)
{
zlog_info ("%s: (%s) Failed to read SNPA and NLRI(s)",
__func__, peer->host);
return -1;
}
{
u_char val;
if ((val = stream_getc (s)))
zlog_warn ("%s sent non-zero value, %u, for defunct SNPA-length field",
peer->host, val);
}
/* must have nrli_len, what is left of the attribute */
nlri_len = LEN_LEFT;
if ((!nlri_len) || (nlri_len > STREAM_READABLE(s)))
{
zlog_info ("%s: (%s) Failed to read NLRI",
__func__, peer->host);
return -1;
}
if (safi != SAFI_MPLS_LABELED_VPN)
{
ret = bgp_nlri_sanity_check (peer, afi, stream_pnt (s), nlri_len);
if (ret < 0)
{
zlog_info ("%s: (%s) NLRI doesn't pass sanity check",
__func__, peer->host);
return -1;
}
}
mp_update->afi = afi;
mp_update->safi = safi;
mp_update->nlri = stream_pnt (s);
mp_update->length = nlri_len;
stream_forward_getp (s, nlri_len);
return 0;
#undef LEN_LEFT
}
/* Multiprotocol unreachable parse */
int
bgp_mp_unreach_parse (struct peer *peer, bgp_size_t length,
struct bgp_nlri *mp_withdraw)
{
struct stream *s;
afi_t afi;
safi_t safi;
u_int16_t withdraw_len;
int ret;
s = peer->ibuf;
#define BGP_MP_UNREACH_MIN_SIZE 3
if ((length > STREAM_READABLE(s)) || (length < BGP_MP_UNREACH_MIN_SIZE))
return -1;
afi = stream_getw (s);
safi = stream_getc (s);
withdraw_len = length - BGP_MP_UNREACH_MIN_SIZE;
if (safi != SAFI_MPLS_LABELED_VPN)
{
ret = bgp_nlri_sanity_check (peer, afi, stream_pnt (s), withdraw_len);
if (ret < 0)
return -1;
}
mp_withdraw->afi = afi;
mp_withdraw->safi = safi;
mp_withdraw->nlri = stream_pnt (s);
mp_withdraw->length = withdraw_len;
stream_forward_getp (s, withdraw_len);
return 0;
}
/* Extended Community attribute. */
static int
bgp_attr_ext_communities (struct peer *peer, bgp_size_t length,
struct attr *attr, u_char flag)
{
if (length == 0)
{
if (attr->extra)
attr->extra->ecommunity = NULL;
/* Empty extcomm doesn't seem to be invalid per se */
return 0;
}
(bgp_attr_extra_get (attr))->ecommunity =
ecommunity_parse ((u_int8_t *)stream_pnt (peer->ibuf), length);
/* XXX: fix ecommunity_parse to use stream API */
stream_forward_getp (peer->ibuf, length);
if (!attr->extra->ecommunity)
return -1;
attr->flag |= ATTR_FLAG_BIT (BGP_ATTR_EXT_COMMUNITIES);
return 0;
}
/* BGP unknown attribute treatment. */
static int
bgp_attr_unknown (struct peer *peer, struct attr *attr, u_char flag,
u_char type, bgp_size_t length, u_char *startp)
{
bgp_size_t total;
struct transit *transit;
struct attr_extra *attre;
if (BGP_DEBUG (normal, NORMAL))
zlog_debug ("%s Unknown attribute is received (type %d, length %d)",
peer->host, type, length);
if (BGP_DEBUG (events, EVENTS))
zlog (peer->log, LOG_DEBUG,
"Unknown attribute type %d length %d is received", type, length);
/* Forward read pointer of input stream. */
stream_forward_getp (peer->ibuf, length);
/* Adjest total length to include type and length. */
total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3);
/* If any of the mandatory well-known attributes are not recognized,
then the Error Subcode is set to Unrecognized Well-known
Attribute. The Data field contains the unrecognized attribute
(type, length and value). */
if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL))
{
/* Adjust startp to do not include flag value. */
bgp_notify_send_with_data (peer,
BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_UNREC_ATTR,
startp, total);
return -1;
}
/* Unrecognized non-transitive optional attributes must be quietly
ignored and not passed along to other BGP peers. */
if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS))
return 0;
/* If a path with recognized transitive optional attribute is
accepted and passed along to other BGP peers and the Partial bit
in the Attribute Flags octet is set to 1 by some previous AS, it
is not set back to 0 by the current AS. */
SET_FLAG (*startp, BGP_ATTR_FLAG_PARTIAL);
/* Store transitive attribute to the end of attr->transit. */
if (! ((attre = bgp_attr_extra_get(attr))->transit) )
attre->transit = XCALLOC (MTYPE_TRANSIT, sizeof (struct transit));
transit = attre->transit;
if (transit->val)
transit->val = XREALLOC (MTYPE_TRANSIT_VAL, transit->val,
transit->length + total);
else
transit->val = XMALLOC (MTYPE_TRANSIT_VAL, total);
memcpy (transit->val + transit->length, startp, total);
transit->length += total;
return 0;
}
/* Read attribute of update packet. This function is called from
bgp_update() in bgpd.c. */
int
bgp_attr_parse (struct peer *peer, struct attr *attr, bgp_size_t size,
struct bgp_nlri *mp_update, struct bgp_nlri *mp_withdraw)
{
int ret;
u_char flag;
u_char type = 0;
bgp_size_t length;
u_char *startp, *endp;
u_char *attr_endp;
u_char seen[BGP_ATTR_BITMAP_SIZE];
/* we need the as4_path only until we have synthesized the as_path with it */
/* same goes for as4_aggregator */
struct aspath *as4_path = NULL;
as_t as4_aggregator = 0;
struct in_addr as4_aggregator_addr = { 0 };
/* Initialize bitmap. */
memset (seen, 0, BGP_ATTR_BITMAP_SIZE);
/* End pointer of BGP attribute. */
endp = BGP_INPUT_PNT (peer) + size;
/* Get attributes to the end of attribute length. */
while (BGP_INPUT_PNT (peer) < endp)
{
/* Check remaining length check.*/
if (endp - BGP_INPUT_PNT (peer) < BGP_ATTR_MIN_LEN)
{
/* XXX warning: long int format, int arg (arg 5) */
zlog (peer->log, LOG_WARNING,
"%s: error BGP attribute length %lu is smaller than min len",
peer->host,
(unsigned long) (endp - STREAM_PNT (BGP_INPUT (peer))));
bgp_notify_send (peer,
BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_ATTR_LENG_ERR);
return -1;
}
/* Fetch attribute flag and type. */
startp = BGP_INPUT_PNT (peer);
/* "The lower-order four bits of the Attribute Flags octet are
unused. They MUST be zero when sent and MUST be ignored when
received." */
flag = 0xF0 & stream_getc (BGP_INPUT (peer));
type = stream_getc (BGP_INPUT (peer));
/* Check whether Extended-Length applies and is in bounds */
if (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN)
&& ((endp - startp) < (BGP_ATTR_MIN_LEN + 1)))
{
zlog (peer->log, LOG_WARNING,
"%s: Extended length set, but just %lu bytes of attr header",
peer->host,
(unsigned long) (endp - STREAM_PNT (BGP_INPUT (peer))));
bgp_notify_send (peer,
BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_ATTR_LENG_ERR);
return -1;
}
/* Check extended attribue length bit. */
if (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN))
length = stream_getw (BGP_INPUT (peer));
else
length = stream_getc (BGP_INPUT (peer));
/* If any attribute appears more than once in the UPDATE
message, then the Error Subcode is set to Malformed Attribute
List. */
if (CHECK_BITMAP (seen, type))
{
zlog (peer->log, LOG_WARNING,
"%s: error BGP attribute type %d appears twice in a message",
peer->host, type);
bgp_notify_send (peer,
BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_MAL_ATTR);
return -1;
}
/* Set type to bitmap to check duplicate attribute. `type' is
unsigned char so it never overflow bitmap range. */
SET_BITMAP (seen, type);
/* Overflow check. */
attr_endp = BGP_INPUT_PNT (peer) + length;
if (attr_endp > endp)
{
zlog (peer->log, LOG_WARNING,
"%s: BGP type %d length %d is too large, attribute total length is %d. attr_endp is %p. endp is %p", peer->host, type, length, size, attr_endp, endp);
bgp_notify_send (peer,
BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_ATTR_LENG_ERR);
return -1;
}
/* OK check attribute and store it's value. */
switch (type)
{
case BGP_ATTR_ORIGIN:
ret = bgp_attr_origin (peer, length, attr, flag, startp);
break;
case BGP_ATTR_AS_PATH:
attr->aspath = bgp_attr_aspath (peer, length, attr, flag, startp, 0);
ret = attr->aspath ? 0 : -1 ;
break;
case BGP_ATTR_AS4_PATH:
as4_path = bgp_attr_aspath (peer, length, attr, flag, startp, 1);
ret = as4_path ? 0 : -1 ;
break;
case BGP_ATTR_NEXT_HOP:
ret = bgp_attr_nexthop (peer, length, attr, flag, startp);
break;
case BGP_ATTR_MULTI_EXIT_DISC:
ret = bgp_attr_med (peer, length, attr, flag, startp);
break;
case BGP_ATTR_LOCAL_PREF:
ret = bgp_attr_local_pref (peer, length, attr, flag, startp);
break;
case BGP_ATTR_ATOMIC_AGGREGATE:
ret = bgp_attr_atomic (peer, length, attr, flag, startp);
break;
case BGP_ATTR_AGGREGATOR:
ret = bgp_attr_aggregator (peer, length, attr, flag);
break;
case BGP_ATTR_AS4_AGGREGATOR:
ret = bgp_attr_as4_aggregator (peer, length, attr, &as4_aggregator, &as4_aggregator_addr);
break;
case BGP_ATTR_COMMUNITIES:
ret = bgp_attr_community (peer, length, attr, flag);
break;
case BGP_ATTR_ORIGINATOR_ID:
ret = bgp_attr_originator_id (peer, length, attr, flag, startp);
break;
case BGP_ATTR_CLUSTER_LIST:
ret = bgp_attr_cluster_list (peer, length, attr, flag, startp);
break;
case BGP_ATTR_MP_REACH_NLRI:
ret = bgp_mp_reach_parse (peer, length, attr, mp_update);
break;
case BGP_ATTR_MP_UNREACH_NLRI:
ret = bgp_mp_unreach_parse (peer, length, mp_withdraw);
break;
case BGP_ATTR_EXT_COMMUNITIES:
ret = bgp_attr_ext_communities (peer, length, attr, flag);
break;
default:
ret = bgp_attr_unknown (peer, attr, flag, type, length, startp);
break;
}
/* If error occured immediately return to the caller. */
if (ret < 0)
{
zlog (peer->log, LOG_WARNING,
"%s: Attribute %s, parse error",
peer->host,
LOOKUP (attr_str, type));
bgp_notify_send (peer,
BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_MAL_ATTR);
return ret;
}
/* Check the fetched length. */
if (BGP_INPUT_PNT (peer) != attr_endp)
{
zlog (peer->log, LOG_WARNING,
"%s: BGP attribute %s, fetch error",
peer->host, LOOKUP (attr_str, type));
bgp_notify_send (peer,
BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_ATTR_LENG_ERR);
return -1;
}
}
/* Check final read pointer is same as end pointer. */
if (BGP_INPUT_PNT (peer) != endp)
{
zlog (peer->log, LOG_WARNING,
"%s: BGP attribute %s, length mismatch",
peer->host, LOOKUP (attr_str, type));
bgp_notify_send (peer,
BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_ATTR_LENG_ERR);
return -1;
}
/*
* At this place we can see whether we got AS4_PATH and/or
* AS4_AGGREGATOR from a 16Bit peer and act accordingly.
* We can not do this before we've read all attributes because
* the as4 handling does not say whether AS4_PATH has to be sent
* after AS_PATH or not - and when AS4_AGGREGATOR will be send
* in relationship to AGGREGATOR.
* So, to be defensive, we are not relying on any order and read
* all attributes first, including these 32bit ones, and now,
* afterwards, we look what and if something is to be done for as4.
*/
if (bgp_attr_munge_as4_attrs (peer, attr, as4_path,
as4_aggregator, &as4_aggregator_addr))
return -1;
/* At this stage, we have done all fiddling with as4, and the
* resulting info is in attr->aggregator resp. attr->aspath
* so we can chuck as4_aggregator and as4_path alltogether in
* order to save memory
*/
if ( as4_path )
{
aspath_unintern( as4_path ); /* unintern - it is in the hash */
as4_path = NULL;
/* The flag that we got this is still there, but that does not
* do any trouble
*/
}
/*
* The "rest" of the code does nothing with as4_aggregator.
* there is no memory attached specifically which is not part
* of the attr.
* so ignoring just means do nothing.
*/
/*
* Finally do the checks on the aspath we did not do yet
* because we waited for a potentially synthesized aspath.
*/
if ( attr->flag & ( ATTR_FLAG_BIT( BGP_ATTR_AS_PATH)))
{
ret = bgp_attr_aspath_check( peer, attr );
if ( ret < 0 )
return ret;
}
/* Finally intern unknown attribute. */
if (attr->extra && attr->extra->transit)
attr->extra->transit = transit_intern (attr->extra->transit);
return 0;
}
/* Well-known attribute check. */
int
bgp_attr_check (struct peer *peer, struct attr *attr)
{
u_char type = 0;
if (! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_ORIGIN)))
type = BGP_ATTR_ORIGIN;
if (! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_AS_PATH)))
type = BGP_ATTR_AS_PATH;
if (! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP)))
type = BGP_ATTR_NEXT_HOP;
if (peer_sort (peer) == BGP_PEER_IBGP
&& ! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_LOCAL_PREF)))
type = BGP_ATTR_LOCAL_PREF;
if (type)
{
zlog (peer->log, LOG_WARNING,
"%s Missing well-known attribute %d.",
peer->host, type);
bgp_notify_send_with_data (peer,
BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_MISS_ATTR,
&type, 1);
return -1;
}
return 0;
}
int stream_put_prefix (struct stream *, struct prefix *);
/* Make attribute packet. */
bgp_size_t
bgp_packet_attribute (struct bgp *bgp, struct peer *peer,
struct stream *s, struct attr *attr, struct prefix *p,
afi_t afi, safi_t safi, struct peer *from,
struct prefix_rd *prd, u_char *tag)
{
size_t cp;
size_t aspath_sizep;
struct aspath *aspath;
int send_as4_path = 0;
int send_as4_aggregator = 0;
int use32bit = (CHECK_FLAG (peer->cap, PEER_CAP_AS4_RCV)) ? 1 : 0;
if (! bgp)
bgp = bgp_get_default ();
/* Remember current pointer. */
cp = stream_get_endp (s);
/* Origin attribute. */
stream_putc (s, BGP_ATTR_FLAG_TRANS);
stream_putc (s, BGP_ATTR_ORIGIN);
stream_putc (s, 1);
stream_putc (s, attr->origin);
/* AS path attribute. */
/* If remote-peer is EBGP */
if (peer_sort (peer) == BGP_PEER_EBGP
&& (! CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_AS_PATH_UNCHANGED)
|| attr->aspath->segments == NULL)
&& (! CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_RSERVER_CLIENT)))
{
aspath = aspath_dup (attr->aspath);
if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION))
{
/* Strip the confed info, and then stuff our path CONFED_ID
on the front */
aspath = aspath_delete_confed_seq (aspath);
aspath = aspath_add_seq (aspath, bgp->confed_id);
}
else
{
aspath = aspath_add_seq (aspath, peer->local_as);
if (peer->change_local_as)
aspath = aspath_add_seq (aspath, peer->change_local_as);
}
}
else if (peer_sort (peer) == BGP_PEER_CONFED)
{
/* A confed member, so we need to do the AS_CONFED_SEQUENCE thing */
aspath = aspath_dup (attr->aspath);
aspath = aspath_add_confed_seq (aspath, peer->local_as);
}
else
aspath = attr->aspath;
/* If peer is not AS4 capable, then:
* - send the created AS_PATH out as AS4_PATH (optional, transitive),
* but ensure that no AS_CONFED_SEQUENCE and AS_CONFED_SET path segment
* types are in it (i.e. exclude them if they are there)
* AND do this only if there is at least one asnum > 65535 in the path!
* - send an AS_PATH out, but put 16Bit ASnums in it, not 32bit, and change
* all ASnums > 65535 to BGP_AS_TRANS
*/
stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN);
stream_putc (s, BGP_ATTR_AS_PATH);
aspath_sizep = stream_get_endp (s);
stream_putw (s, 0);
stream_putw_at (s, aspath_sizep, aspath_put (s, aspath, use32bit));
/* OLD session may need NEW_AS_PATH sent, if there are 4-byte ASNs
* in the path
*/
if (!use32bit && aspath_has_as4 (aspath))
send_as4_path = 1; /* we'll do this later, at the correct place */
/* Nexthop attribute. */
if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_NEXT_HOP) && afi == AFI_IP)
{
stream_putc (s, BGP_ATTR_FLAG_TRANS);
stream_putc (s, BGP_ATTR_NEXT_HOP);
stream_putc (s, 4);
if (safi == SAFI_MPLS_VPN)
{
if (attr->nexthop.s_addr == 0)
stream_put_ipv4 (s, peer->nexthop.v4.s_addr);
else
stream_put_ipv4 (s, attr->nexthop.s_addr);
}
else
stream_put_ipv4 (s, attr->nexthop.s_addr);
}
/* MED attribute. */
if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC))
{
stream_putc (s, BGP_ATTR_FLAG_OPTIONAL);
stream_putc (s, BGP_ATTR_MULTI_EXIT_DISC);
stream_putc (s, 4);
stream_putl (s, attr->med);
}
/* Local preference. */
if (peer_sort (peer) == BGP_PEER_IBGP ||
peer_sort (peer) == BGP_PEER_CONFED)
{
stream_putc (s, BGP_ATTR_FLAG_TRANS);
stream_putc (s, BGP_ATTR_LOCAL_PREF);
stream_putc (s, 4);
stream_putl (s, attr->local_pref);
}
/* Atomic aggregate. */
if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE))
{
stream_putc (s, BGP_ATTR_FLAG_TRANS);
stream_putc (s, BGP_ATTR_ATOMIC_AGGREGATE);
stream_putc (s, 0);
}
/* Aggregator. */
if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR))
{
assert (attr->extra);
/* Common to BGP_ATTR_AGGREGATOR, regardless of ASN size */
stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS);
stream_putc (s, BGP_ATTR_AGGREGATOR);
if (use32bit)
{
/* AS4 capable peer */
stream_putc (s, 8);
stream_putl (s, attr->extra->aggregator_as);
}
else
{
/* 2-byte AS peer */
stream_putc (s, 6);
/* Is ASN representable in 2-bytes? Or must AS_TRANS be used? */
if ( attr->extra->aggregator_as > 65535 )
{
stream_putw (s, BGP_AS_TRANS);
/* we have to send AS4_AGGREGATOR, too.
* we'll do that later in order to send attributes in ascending
* order.
*/
send_as4_aggregator = 1;
}
else
stream_putw (s, (u_int16_t) attr->extra->aggregator_as);
}
stream_put_ipv4 (s, attr->extra->aggregator_addr.s_addr);
}
/* Community attribute. */
if (CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_SEND_COMMUNITY)
&& (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES)))
{
if (attr->community->size * 4 > 255)
{
stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN);
stream_putc (s, BGP_ATTR_COMMUNITIES);
stream_putw (s, attr->community->size * 4);
}
else
{
stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS);
stream_putc (s, BGP_ATTR_COMMUNITIES);
stream_putc (s, attr->community->size * 4);
}
stream_put (s, attr->community->val, attr->community->size * 4);
}
/* Route Reflector. */
if (peer_sort (peer) == BGP_PEER_IBGP
&& from
&& peer_sort (from) == BGP_PEER_IBGP)
{
/* Originator ID. */
stream_putc (s, BGP_ATTR_FLAG_OPTIONAL);
stream_putc (s, BGP_ATTR_ORIGINATOR_ID);
stream_putc (s, 4);
if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID))
stream_put_in_addr (s, &attr->extra->originator_id);
else
stream_put_in_addr (s, &from->remote_id);
/* Cluster list. */
stream_putc (s, BGP_ATTR_FLAG_OPTIONAL);
stream_putc (s, BGP_ATTR_CLUSTER_LIST);
if (attr->extra && attr->extra->cluster)
{
stream_putc (s, attr->extra->cluster->length + 4);
/* If this peer configuration's parent BGP has cluster_id. */
if (bgp->config & BGP_CONFIG_CLUSTER_ID)
stream_put_in_addr (s, &bgp->cluster_id);
else
stream_put_in_addr (s, &bgp->router_id);
stream_put (s, attr->extra->cluster->list,
attr->extra->cluster->length);
}
else
{
stream_putc (s, 4);
/* If this peer configuration's parent BGP has cluster_id. */
if (bgp->config & BGP_CONFIG_CLUSTER_ID)
stream_put_in_addr (s, &bgp->cluster_id);
else
stream_put_in_addr (s, &bgp->router_id);
}
}
#ifdef HAVE_IPV6
/* If p is IPv6 address put it into attribute. */
if (p->family == AF_INET6)
{
unsigned long sizep;
struct attr_extra *attre = attr->extra;
assert (attr->extra);
stream_putc (s, BGP_ATTR_FLAG_OPTIONAL);
stream_putc (s, BGP_ATTR_MP_REACH_NLRI);
sizep = stream_get_endp (s);
stream_putc (s, 0); /* Marker: Attribute length. */
stream_putw (s, AFI_IP6); /* AFI */
stream_putc (s, safi); /* SAFI */
stream_putc (s, attre->mp_nexthop_len);
if (attre->mp_nexthop_len == 16)
stream_put (s, &attre->mp_nexthop_global, 16);
else if (attre->mp_nexthop_len == 32)
{
stream_put (s, &attre->mp_nexthop_global, 16);
stream_put (s, &attre->mp_nexthop_local, 16);
}
/* SNPA */
stream_putc (s, 0);
/* Prefix write. */
stream_put_prefix (s, p);
/* Set MP attribute length. */
stream_putc_at (s, sizep, (stream_get_endp (s) - sizep) - 1);
}
#endif /* HAVE_IPV6 */
if (p->family == AF_INET && safi == SAFI_MULTICAST)
{
unsigned long sizep;
stream_putc (s, BGP_ATTR_FLAG_OPTIONAL);
stream_putc (s, BGP_ATTR_MP_REACH_NLRI);
sizep = stream_get_endp (s);
stream_putc (s, 0); /* Marker: Attribute Length. */
stream_putw (s, AFI_IP); /* AFI */
stream_putc (s, SAFI_MULTICAST); /* SAFI */
stream_putc (s, 4);
stream_put_ipv4 (s, attr->nexthop.s_addr);
/* SNPA */
stream_putc (s, 0);
/* Prefix write. */
stream_put_prefix (s, p);
/* Set MP attribute length. */
stream_putc_at (s, sizep, (stream_get_endp (s) - sizep) - 1);
}
if (p->family == AF_INET && safi == SAFI_MPLS_VPN)
{
unsigned long sizep;
stream_putc (s, BGP_ATTR_FLAG_OPTIONAL);
stream_putc (s, BGP_ATTR_MP_REACH_NLRI);
sizep = stream_get_endp (s);
stream_putc (s, 0); /* Length of this attribute. */
stream_putw (s, AFI_IP); /* AFI */
stream_putc (s, SAFI_MPLS_LABELED_VPN); /* SAFI */
stream_putc (s, 12);
stream_putl (s, 0);
stream_putl (s, 0);
stream_put (s, &attr->extra->mp_nexthop_global_in, 4);
/* SNPA */
stream_putc (s, 0);
/* Tag, RD, Prefix write. */
stream_putc (s, p->prefixlen + 88);
stream_put (s, tag, 3);
stream_put (s, prd->val, 8);
stream_put (s, &p->u.prefix, PSIZE (p->prefixlen));
/* Set MP attribute length. */
stream_putc_at (s, sizep, (stream_get_endp (s) - sizep) - 1);
}
/* Extended Communities attribute. */
if (CHECK_FLAG (peer->af_flags[afi][safi], PEER_FLAG_SEND_EXT_COMMUNITY)
&& (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_EXT_COMMUNITIES)))
{
struct attr_extra *attre = attr->extra;
assert (attre);
if (peer_sort (peer) == BGP_PEER_IBGP
|| peer_sort (peer) == BGP_PEER_CONFED)
{
if (attre->ecommunity->size * 8 > 255)
{
stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN);
stream_putc (s, BGP_ATTR_EXT_COMMUNITIES);
stream_putw (s, attre->ecommunity->size * 8);
}
else
{
stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS);
stream_putc (s, BGP_ATTR_EXT_COMMUNITIES);
stream_putc (s, attre->ecommunity->size * 8);
}
stream_put (s, attre->ecommunity->val, attre->ecommunity->size * 8);
}
else
{
u_int8_t *pnt;
int tbit;
int ecom_tr_size = 0;
int i;
for (i = 0; i < attre->ecommunity->size; i++)
{
pnt = attre->ecommunity->val + (i * 8);
tbit = *pnt;
if (CHECK_FLAG (tbit, ECOMMUNITY_FLAG_NON_TRANSITIVE))
continue;
ecom_tr_size++;
}
if (ecom_tr_size)
{
if (ecom_tr_size * 8 > 255)
{
stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN);
stream_putc (s, BGP_ATTR_EXT_COMMUNITIES);
stream_putw (s, ecom_tr_size * 8);
}
else
{
stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS);
stream_putc (s, BGP_ATTR_EXT_COMMUNITIES);
stream_putc (s, ecom_tr_size * 8);
}
for (i = 0; i < attre->ecommunity->size; i++)
{
pnt = attre->ecommunity->val + (i * 8);
tbit = *pnt;
if (CHECK_FLAG (tbit, ECOMMUNITY_FLAG_NON_TRANSITIVE))
continue;
stream_put (s, pnt, 8);
}
}
}
}
if ( send_as4_path )
{
/* If the peer is NOT As4 capable, AND */
/* there are ASnums > 65535 in path THEN
* give out AS4_PATH */
/* Get rid of all AS_CONFED_SEQUENCE and AS_CONFED_SET
* path segments!
* Hm, I wonder... confederation things *should* only be at
* the beginning of an aspath, right? Then we should use
* aspath_delete_confed_seq for this, because it is already
* there! (JK)
* Folks, talk to me: what is reasonable here!?
*/
aspath = aspath_delete_confed_seq (aspath);
stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_EXTLEN);
stream_putc (s, BGP_ATTR_AS4_PATH);
aspath_sizep = stream_get_endp (s);
stream_putw (s, 0);
stream_putw_at (s, aspath_sizep, aspath_put (s, aspath, 1));
}
if (aspath != attr->aspath)
aspath_free (aspath);
if ( send_as4_aggregator )
{
assert (attr->extra);
/* send AS4_AGGREGATOR, at this place */
/* this section of code moved here in order to ensure the correct
* *ascending* order of attributes
*/
stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS);
stream_putc (s, BGP_ATTR_AS4_AGGREGATOR);
stream_putc (s, 8);
stream_putl (s, attr->extra->aggregator_as);
stream_put_ipv4 (s, attr->extra->aggregator_addr.s_addr);
}
/* Unknown transit attribute. */
if (attr->extra && attr->extra->transit)
stream_put (s, attr->extra->transit->val, attr->extra->transit->length);
/* Return total size of attribute. */
return stream_get_endp (s) - cp;
}
bgp_size_t
bgp_packet_withdraw (struct peer *peer, struct stream *s, struct prefix *p,
afi_t afi, safi_t safi, struct prefix_rd *prd,
u_char *tag)
{
unsigned long cp;
unsigned long attrlen_pnt;
bgp_size_t size;
cp = stream_get_endp (s);
stream_putc (s, BGP_ATTR_FLAG_OPTIONAL);
stream_putc (s, BGP_ATTR_MP_UNREACH_NLRI);
attrlen_pnt = stream_get_endp (s);
stream_putc (s, 0); /* Length of this attribute. */
stream_putw (s, family2afi (p->family));
if (safi == SAFI_MPLS_VPN)
{
/* SAFI */
stream_putc (s, SAFI_MPLS_LABELED_VPN);
/* prefix. */
stream_putc (s, p->prefixlen + 88);
stream_put (s, tag, 3);
stream_put (s, prd->val, 8);
stream_put (s, &p->u.prefix, PSIZE (p->prefixlen));
}
else
{
/* SAFI */
stream_putc (s, safi);
/* prefix */
stream_put_prefix (s, p);
}
/* Set MP attribute length. */
size = stream_get_endp (s) - attrlen_pnt - 1;
stream_putc_at (s, attrlen_pnt, size);
return stream_get_endp (s) - cp;
}
/* Initialization of attribute. */
void
bgp_attr_init (void)
{
aspath_init ();
attrhash_init ();
community_init ();
ecommunity_init ();
cluster_init ();
transit_init ();
}
void
bgp_attr_finish (void)
{
aspath_finish ();
attrhash_finish ();
community_finish ();
ecommunity_finish ();
cluster_finish ();
transit_finish ();
}
/* Make attribute packet. */
void
bgp_dump_routes_attr (struct stream *s, struct attr *attr,
struct prefix *prefix)
{
unsigned long cp;
unsigned long len;
size_t aspath_lenp;
struct aspath *aspath;
/* Remember current pointer. */
cp = stream_get_endp (s);
/* Place holder of length. */
stream_putw (s, 0);
/* Origin attribute. */
stream_putc (s, BGP_ATTR_FLAG_TRANS);
stream_putc (s, BGP_ATTR_ORIGIN);
stream_putc (s, 1);
stream_putc (s, attr->origin);
aspath = attr->aspath;
stream_putc (s, BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN);
stream_putc (s, BGP_ATTR_AS_PATH);
aspath_lenp = stream_get_endp (s);
stream_putw (s, 0);
stream_putw_at (s, aspath_lenp, aspath_put (s, aspath, 1));
/* Nexthop attribute. */
/* If it's an IPv6 prefix, don't dump the IPv4 nexthop to save space */
if(prefix != NULL
#ifdef HAVE_IPV6
&& prefix->family != AF_INET6
#endif /* HAVE_IPV6 */
)
{
stream_putc (s, BGP_ATTR_FLAG_TRANS);
stream_putc (s, BGP_ATTR_NEXT_HOP);
stream_putc (s, 4);
stream_put_ipv4 (s, attr->nexthop.s_addr);
}
/* MED attribute. */
if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC))
{
stream_putc (s, BGP_ATTR_FLAG_OPTIONAL);
stream_putc (s, BGP_ATTR_MULTI_EXIT_DISC);
stream_putc (s, 4);
stream_putl (s, attr->med);
}
/* Local preference. */
if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_LOCAL_PREF))
{
stream_putc (s, BGP_ATTR_FLAG_TRANS);
stream_putc (s, BGP_ATTR_LOCAL_PREF);
stream_putc (s, 4);
stream_putl (s, attr->local_pref);
}
/* Atomic aggregate. */
if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_ATOMIC_AGGREGATE))
{
stream_putc (s, BGP_ATTR_FLAG_TRANS);
stream_putc (s, BGP_ATTR_ATOMIC_AGGREGATE);
stream_putc (s, 0);
}
/* Aggregator. */
if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_AGGREGATOR))
{
assert (attr->extra);
stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS);
stream_putc (s, BGP_ATTR_AGGREGATOR);
stream_putc (s, 8);
stream_putl (s, attr->extra->aggregator_as);
stream_put_ipv4 (s, attr->extra->aggregator_addr.s_addr);
}
/* Community attribute. */
if (attr->flag & ATTR_FLAG_BIT (BGP_ATTR_COMMUNITIES))
{
if (attr->community->size * 4 > 255)
{
stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS|BGP_ATTR_FLAG_EXTLEN);
stream_putc (s, BGP_ATTR_COMMUNITIES);
stream_putw (s, attr->community->size * 4);
}
else
{
stream_putc (s, BGP_ATTR_FLAG_OPTIONAL|BGP_ATTR_FLAG_TRANS);
stream_putc (s, BGP_ATTR_COMMUNITIES);
stream_putc (s, attr->community->size * 4);
}
stream_put (s, attr->community->val, attr->community->size * 4);
}
#ifdef HAVE_IPV6
/* Add a MP_NLRI attribute to dump the IPv6 next hop */
if (prefix != NULL && prefix->family == AF_INET6 && attr->extra &&
(attr->extra->mp_nexthop_len == 16 || attr->extra->mp_nexthop_len == 32) )
{
int sizep;
struct attr_extra *attre = attr->extra;
stream_putc(s, BGP_ATTR_FLAG_OPTIONAL);
stream_putc(s, BGP_ATTR_MP_REACH_NLRI);
sizep = stream_get_endp (s);
/* MP header */
stream_putc (s, 0); /* Marker: Attribute length. */
stream_putw(s, AFI_IP6); /* AFI */
stream_putc(s, SAFI_UNICAST); /* SAFI */
/* Next hop */
stream_putc(s, attre->mp_nexthop_len);
stream_put(s, &attre->mp_nexthop_global, 16);
if (attre->mp_nexthop_len == 32)
stream_put(s, &attre->mp_nexthop_local, 16);
/* SNPA */
stream_putc(s, 0);
/* Prefix */
stream_put_prefix(s, prefix);
/* Set MP attribute length. */
stream_putc_at (s, sizep, (stream_get_endp (s) - sizep) - 1);
}
#endif /* HAVE_IPV6 */
/* Return total size of attribute. */
len = stream_get_endp (s) - cp - 2;
stream_putw_at (s, cp, len);
}
|