1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
|
/* 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 this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zebra.h>
#include "linklist.h"
#include "prefix.h"
#include "memory.h"
#include "vector.h"
#include "stream.h"
#include "log.h"
#include "hash.h"
#include "jhash.h"
#include "queue.h"
#include "table.h"
#include "filter.h"
#include "command.h"
#include "srv6.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_errors.h"
#include "bgpd/bgp_label.h"
#include "bgpd/bgp_packet.h"
#include "bgpd/bgp_ecommunity.h"
#include "bgpd/bgp_lcommunity.h"
#include "bgpd/bgp_updgrp.h"
#include "bgpd/bgp_encap_types.h"
#ifdef ENABLE_BGP_VNC
#include "bgpd/rfapi/bgp_rfapi_cfg.h"
#include "bgp_encap_types.h"
#include "bgp_vnc_types.h"
#endif
#include "bgp_evpn.h"
#include "bgp_flowspec_private.h"
#include "bgp_mac.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_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"},
{BGP_ATTR_PMSI_TUNNEL, "PMSI_TUNNEL_ATTRIBUTE"},
{BGP_ATTR_ENCAP, "ENCAP"},
#ifdef ENABLE_BGP_VNC_ATTR
{BGP_ATTR_VNC, "VNC"},
#endif
{BGP_ATTR_LARGE_COMMUNITIES, "LARGE_COMMUNITY"},
{BGP_ATTR_PREFIX_SID, "PREFIX_SID"},
{BGP_ATTR_IPV6_EXT_COMMUNITIES, "IPV6_EXT_COMMUNITIES"},
{0}};
static const struct message attr_flag_str[] = {
{BGP_ATTR_FLAG_OPTIONAL, "Optional"},
{BGP_ATTR_FLAG_TRANS, "Transitive"},
{BGP_ATTR_FLAG_PARTIAL, "Partial"},
/* bgp_attr_flags_diagnose() relies on this bit being last in
this list */
{BGP_ATTR_FLAG_EXTLEN, "Extended Length"},
{0}};
static struct hash *cluster_hash;
static void *cluster_hash_alloc(void *p)
{
const struct cluster_list *val = (const 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 = length == 0 ? NULL : pnt;
cluster = hash_get(cluster_hash, &tmp, cluster_hash_alloc);
cluster->refcnt++;
return cluster;
}
bool 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 true;
return false;
}
static unsigned int cluster_hash_key_make(const void *p)
{
const struct cluster_list *cluster = p;
return jhash(cluster->list, cluster->length, 0);
}
static bool cluster_hash_cmp(const void *p1, const void *p2)
{
const struct cluster_list *cluster1 = p1;
const struct cluster_list *cluster2 = p2;
if (cluster1->list == cluster2->list)
return true;
if (!cluster1->list || !cluster2->list)
return false;
if (cluster1->length != cluster2->length)
return false;
return (memcmp(cluster1->list, cluster2->list, cluster1->length) == 0);
}
static void cluster_free(struct cluster_list *cluster)
{
XFREE(MTYPE_CLUSTER_VAL, cluster->list);
XFREE(MTYPE_CLUSTER, cluster);
}
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;
}
static void cluster_unintern(struct cluster_list **cluster)
{
if ((*cluster)->refcnt)
(*cluster)->refcnt--;
if ((*cluster)->refcnt == 0) {
void *p = hash_release(cluster_hash, *cluster);
assert(p == *cluster);
cluster_free(*cluster);
*cluster = NULL;
}
}
static void cluster_init(void)
{
cluster_hash = hash_create(cluster_hash_key_make, cluster_hash_cmp,
"BGP Cluster");
}
static void cluster_finish(void)
{
hash_clean(cluster_hash, (void (*)(void *))cluster_free);
hash_free(cluster_hash);
cluster_hash = NULL;
}
static struct hash *encap_hash = NULL;
#ifdef ENABLE_BGP_VNC
static struct hash *vnc_hash = NULL;
#endif
static struct hash *srv6_l3vpn_hash;
static struct hash *srv6_vpn_hash;
struct bgp_attr_encap_subtlv *encap_tlv_dup(struct bgp_attr_encap_subtlv *orig)
{
struct bgp_attr_encap_subtlv *new;
struct bgp_attr_encap_subtlv *tail;
struct bgp_attr_encap_subtlv *p;
for (p = orig, tail = new = NULL; p; p = p->next) {
int size = sizeof(struct bgp_attr_encap_subtlv) + p->length;
if (tail) {
tail->next = XCALLOC(MTYPE_ENCAP_TLV, size);
tail = tail->next;
} else {
tail = new = XCALLOC(MTYPE_ENCAP_TLV, size);
}
assert(tail);
memcpy(tail, p, size);
tail->next = NULL;
}
return new;
}
static void encap_free(struct bgp_attr_encap_subtlv *p)
{
struct bgp_attr_encap_subtlv *next;
while (p) {
next = p->next;
p->next = NULL;
XFREE(MTYPE_ENCAP_TLV, p);
p = next;
}
}
void bgp_attr_flush_encap(struct attr *attr)
{
if (!attr)
return;
if (attr->encap_subtlvs) {
encap_free(attr->encap_subtlvs);
attr->encap_subtlvs = NULL;
}
#ifdef ENABLE_BGP_VNC
struct bgp_attr_encap_subtlv *vnc_subtlvs =
bgp_attr_get_vnc_subtlvs(attr);
if (vnc_subtlvs) {
encap_free(vnc_subtlvs);
bgp_attr_set_vnc_subtlvs(attr, NULL);
}
#endif
}
/*
* Compare encap sub-tlv chains
*
* 1 = equivalent
* 0 = not equivalent
*
* This algorithm could be made faster if needed
*/
static bool encap_same(const struct bgp_attr_encap_subtlv *h1,
const struct bgp_attr_encap_subtlv *h2)
{
const struct bgp_attr_encap_subtlv *p;
const struct bgp_attr_encap_subtlv *q;
if (h1 == h2)
return true;
if (h1 == NULL || h2 == NULL)
return false;
for (p = h1; p; p = p->next) {
for (q = h2; q; q = q->next) {
if ((p->type == q->type) && (p->length == q->length)
&& !memcmp(p->value, q->value, p->length)) {
break;
}
}
if (!q)
return false;
}
for (p = h2; p; p = p->next) {
for (q = h1; q; q = q->next) {
if ((p->type == q->type) && (p->length == q->length)
&& !memcmp(p->value, q->value, p->length)) {
break;
}
}
if (!q)
return false;
}
return true;
}
static void *encap_hash_alloc(void *p)
{
/* Encap structure is already allocated. */
return p;
}
typedef enum {
ENCAP_SUBTLV_TYPE,
#ifdef ENABLE_BGP_VNC
VNC_SUBTLV_TYPE
#endif
} encap_subtlv_type;
static struct bgp_attr_encap_subtlv *
encap_intern(struct bgp_attr_encap_subtlv *encap, encap_subtlv_type type)
{
struct bgp_attr_encap_subtlv *find;
struct hash *hash = encap_hash;
#ifdef ENABLE_BGP_VNC
if (type == VNC_SUBTLV_TYPE)
hash = vnc_hash;
#endif
find = hash_get(hash, encap, encap_hash_alloc);
if (find != encap)
encap_free(encap);
find->refcnt++;
return find;
}
static void encap_unintern(struct bgp_attr_encap_subtlv **encapp,
encap_subtlv_type type)
{
struct bgp_attr_encap_subtlv *encap = *encapp;
if (encap->refcnt)
encap->refcnt--;
if (encap->refcnt == 0) {
struct hash *hash = encap_hash;
#ifdef ENABLE_BGP_VNC
if (type == VNC_SUBTLV_TYPE)
hash = vnc_hash;
#endif
hash_release(hash, encap);
encap_free(encap);
*encapp = NULL;
}
}
static unsigned int encap_hash_key_make(const void *p)
{
const struct bgp_attr_encap_subtlv *encap = p;
return jhash(encap->value, encap->length, 0);
}
static bool encap_hash_cmp(const void *p1, const void *p2)
{
return encap_same((const struct bgp_attr_encap_subtlv *)p1,
(const struct bgp_attr_encap_subtlv *)p2);
}
static void encap_init(void)
{
encap_hash = hash_create(encap_hash_key_make, encap_hash_cmp,
"BGP Encap Hash");
#ifdef ENABLE_BGP_VNC
vnc_hash = hash_create(encap_hash_key_make, encap_hash_cmp,
"BGP VNC Hash");
#endif
}
static void encap_finish(void)
{
hash_clean(encap_hash, (void (*)(void *))encap_free);
hash_free(encap_hash);
encap_hash = NULL;
#ifdef ENABLE_BGP_VNC
hash_clean(vnc_hash, (void (*)(void *))encap_free);
hash_free(vnc_hash);
vnc_hash = NULL;
#endif
}
static bool overlay_index_same(const struct attr *a1, const struct attr *a2)
{
if (!a1 && a2)
return false;
if (!a2 && a1)
return false;
if (!a1 && !a2)
return true;
return bgp_route_evpn_same(bgp_attr_get_evpn_overlay(a1),
bgp_attr_get_evpn_overlay(a2));
}
/* Unknown transit attribute. */
static struct hash *transit_hash;
static void transit_free(struct transit *transit)
{
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;
}
static void transit_unintern(struct transit **transit)
{
if ((*transit)->refcnt)
(*transit)->refcnt--;
if ((*transit)->refcnt == 0) {
hash_release(transit_hash, *transit);
transit_free(*transit);
*transit = NULL;
}
}
static void *srv6_l3vpn_hash_alloc(void *p)
{
return p;
}
static void srv6_l3vpn_free(struct bgp_attr_srv6_l3vpn *l3vpn)
{
XFREE(MTYPE_BGP_SRV6_L3VPN, l3vpn);
}
static struct bgp_attr_srv6_l3vpn *
srv6_l3vpn_intern(struct bgp_attr_srv6_l3vpn *l3vpn)
{
struct bgp_attr_srv6_l3vpn *find;
find = hash_get(srv6_l3vpn_hash, l3vpn, srv6_l3vpn_hash_alloc);
if (find != l3vpn)
srv6_l3vpn_free(l3vpn);
find->refcnt++;
return find;
}
static void srv6_l3vpn_unintern(struct bgp_attr_srv6_l3vpn **l3vpnp)
{
struct bgp_attr_srv6_l3vpn *l3vpn = *l3vpnp;
if (l3vpn->refcnt)
l3vpn->refcnt--;
if (l3vpn->refcnt == 0) {
hash_release(srv6_l3vpn_hash, l3vpn);
srv6_l3vpn_free(l3vpn);
*l3vpnp = NULL;
}
}
static void *srv6_vpn_hash_alloc(void *p)
{
return p;
}
static void srv6_vpn_free(struct bgp_attr_srv6_vpn *vpn)
{
XFREE(MTYPE_BGP_SRV6_VPN, vpn);
}
static struct bgp_attr_srv6_vpn *srv6_vpn_intern(struct bgp_attr_srv6_vpn *vpn)
{
struct bgp_attr_srv6_vpn *find;
find = hash_get(srv6_vpn_hash, vpn, srv6_vpn_hash_alloc);
if (find != vpn)
srv6_vpn_free(vpn);
find->refcnt++;
return find;
}
static void srv6_vpn_unintern(struct bgp_attr_srv6_vpn **vpnp)
{
struct bgp_attr_srv6_vpn *vpn = *vpnp;
if (vpn->refcnt)
vpn->refcnt--;
if (vpn->refcnt == 0) {
hash_release(srv6_vpn_hash, vpn);
srv6_vpn_free(vpn);
*vpnp = NULL;
}
}
static uint32_t srv6_l3vpn_hash_key_make(const void *p)
{
const struct bgp_attr_srv6_l3vpn *l3vpn = p;
uint32_t key = 0;
key = jhash(&l3vpn->sid, 16, key);
key = jhash_1word(l3vpn->sid_flags, key);
key = jhash_1word(l3vpn->endpoint_behavior, key);
key = jhash_1word(l3vpn->loc_block_len, key);
key = jhash_1word(l3vpn->loc_node_len, key);
key = jhash_1word(l3vpn->func_len, key);
key = jhash_1word(l3vpn->arg_len, key);
key = jhash_1word(l3vpn->transposition_len, key);
key = jhash_1word(l3vpn->transposition_offset, key);
return key;
}
static bool srv6_l3vpn_hash_cmp(const void *p1, const void *p2)
{
const struct bgp_attr_srv6_l3vpn *l3vpn1 = p1;
const struct bgp_attr_srv6_l3vpn *l3vpn2 = p2;
return sid_same(&l3vpn1->sid, &l3vpn2->sid)
&& l3vpn1->sid_flags == l3vpn2->sid_flags
&& l3vpn1->endpoint_behavior == l3vpn2->endpoint_behavior
&& l3vpn1->loc_block_len == l3vpn2->loc_block_len
&& l3vpn1->loc_node_len == l3vpn2->loc_node_len
&& l3vpn1->func_len == l3vpn2->func_len
&& l3vpn1->arg_len == l3vpn2->arg_len
&& l3vpn1->transposition_len == l3vpn2->transposition_len
&& l3vpn1->transposition_offset == l3vpn2->transposition_offset;
}
static bool srv6_l3vpn_same(const struct bgp_attr_srv6_l3vpn *h1,
const struct bgp_attr_srv6_l3vpn *h2)
{
if (h1 == h2)
return true;
else if (h1 == NULL || h2 == NULL)
return false;
else
return srv6_l3vpn_hash_cmp((const void *)h1, (const void *)h2);
}
static unsigned int srv6_vpn_hash_key_make(const void *p)
{
const struct bgp_attr_srv6_vpn *vpn = p;
uint32_t key = 0;
key = jhash(&vpn->sid, 16, key);
key = jhash_1word(vpn->sid_flags, key);
return key;
}
static bool srv6_vpn_hash_cmp(const void *p1, const void *p2)
{
const struct bgp_attr_srv6_vpn *vpn1 = p1;
const struct bgp_attr_srv6_vpn *vpn2 = p2;
return sid_same(&vpn1->sid, &vpn2->sid)
&& vpn1->sid_flags == vpn2->sid_flags;
}
static bool srv6_vpn_same(const struct bgp_attr_srv6_vpn *h1,
const struct bgp_attr_srv6_vpn *h2)
{
if (h1 == h2)
return true;
else if (h1 == NULL || h2 == NULL)
return false;
else
return srv6_vpn_hash_cmp((const void *)h1, (const void *)h2);
}
static void srv6_init(void)
{
srv6_l3vpn_hash =
hash_create(srv6_l3vpn_hash_key_make, srv6_l3vpn_hash_cmp,
"BGP Prefix-SID SRv6-L3VPN-Service-TLV");
srv6_vpn_hash = hash_create(srv6_vpn_hash_key_make, srv6_vpn_hash_cmp,
"BGP Prefix-SID SRv6-VPN-Service-TLV");
}
static void srv6_finish(void)
{
hash_clean(srv6_l3vpn_hash, (void (*)(void *))srv6_l3vpn_free);
hash_free(srv6_l3vpn_hash);
srv6_l3vpn_hash = NULL;
hash_clean(srv6_vpn_hash, (void (*)(void *))srv6_vpn_free);
hash_free(srv6_vpn_hash);
srv6_vpn_hash = NULL;
}
static unsigned int transit_hash_key_make(const void *p)
{
const struct transit *transit = p;
return jhash(transit->val, transit->length, 0);
}
static bool 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,
"BGP Transit Hash");
}
static void transit_finish(void)
{
hash_clean(transit_hash, (void (*)(void *))transit_free);
hash_free(transit_hash);
transit_hash = NULL;
}
/* Attribute hash routines. */
static struct hash *attrhash;
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(const void *p)
{
const struct attr *attr = (struct attr *)p;
uint32_t key = 0;
#define MIX(val) key = jhash_1word(val, key)
#define MIX3(a, b, c) key = jhash_3words((a), (b), (c), key)
MIX3(attr->origin, attr->nexthop.s_addr, attr->med);
MIX3(attr->local_pref, attr->aggregator_as,
attr->aggregator_addr.s_addr);
MIX3(attr->weight, attr->mp_nexthop_global_in.s_addr,
attr->originator_id.s_addr);
MIX3(attr->tag, attr->label, attr->label_index);
if (attr->aspath)
MIX(aspath_key_make(attr->aspath));
if (bgp_attr_get_community(attr))
MIX(community_hash_make(bgp_attr_get_community(attr)));
if (bgp_attr_get_lcommunity(attr))
MIX(lcommunity_hash_make(bgp_attr_get_lcommunity(attr)));
if (bgp_attr_get_ecommunity(attr))
MIX(ecommunity_hash_make(bgp_attr_get_ecommunity(attr)));
if (bgp_attr_get_ipv6_ecommunity(attr))
MIX(ecommunity_hash_make(bgp_attr_get_ipv6_ecommunity(attr)));
if (bgp_attr_get_cluster(attr))
MIX(cluster_hash_key_make(bgp_attr_get_cluster(attr)));
if (bgp_attr_get_transit(attr))
MIX(transit_hash_key_make(bgp_attr_get_transit(attr)));
if (attr->encap_subtlvs)
MIX(encap_hash_key_make(attr->encap_subtlvs));
if (attr->srv6_l3vpn)
MIX(srv6_l3vpn_hash_key_make(attr->srv6_l3vpn));
if (attr->srv6_vpn)
MIX(srv6_vpn_hash_key_make(attr->srv6_vpn));
#ifdef ENABLE_BGP_VNC
struct bgp_attr_encap_subtlv *vnc_subtlvs =
bgp_attr_get_vnc_subtlvs(attr);
if (vnc_subtlvs)
MIX(encap_hash_key_make(vnc_subtlvs));
#endif
MIX(attr->mp_nexthop_len);
key = jhash(attr->mp_nexthop_global.s6_addr, IPV6_MAX_BYTELEN, key);
key = jhash(attr->mp_nexthop_local.s6_addr, IPV6_MAX_BYTELEN, key);
MIX3(attr->nh_ifindex, attr->nh_lla_ifindex, attr->distance);
MIX(attr->rmap_table_id);
MIX(attr->nh_type);
MIX(attr->bh_type);
return key;
}
bool 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
&& bgp_attr_get_community(attr1)
== bgp_attr_get_community(attr2)
&& attr1->med == attr2->med
&& attr1->local_pref == attr2->local_pref
&& attr1->rmap_change_flags == attr2->rmap_change_flags) {
if (attr1->aggregator_as == attr2->aggregator_as
&& attr1->aggregator_addr.s_addr
== attr2->aggregator_addr.s_addr
&& attr1->weight == attr2->weight
&& attr1->tag == attr2->tag
&& attr1->label_index == attr2->label_index
&& attr1->mp_nexthop_len == attr2->mp_nexthop_len
&& bgp_attr_get_ecommunity(attr1)
== bgp_attr_get_ecommunity(attr2)
&& bgp_attr_get_ipv6_ecommunity(attr1)
== bgp_attr_get_ipv6_ecommunity(attr2)
&& bgp_attr_get_lcommunity(attr1)
== bgp_attr_get_lcommunity(attr2)
&& bgp_attr_get_cluster(attr1)
== bgp_attr_get_cluster(attr2)
&& bgp_attr_get_transit(attr1)
== bgp_attr_get_transit(attr2)
&& attr1->rmap_table_id == attr2->rmap_table_id
&& (attr1->encap_tunneltype == attr2->encap_tunneltype)
&& encap_same(attr1->encap_subtlvs, attr2->encap_subtlvs)
#ifdef ENABLE_BGP_VNC
&& encap_same(bgp_attr_get_vnc_subtlvs(attr1),
bgp_attr_get_vnc_subtlvs(attr2))
#endif
&& IPV6_ADDR_SAME(&attr1->mp_nexthop_global,
&attr2->mp_nexthop_global)
&& IPV6_ADDR_SAME(&attr1->mp_nexthop_local,
&attr2->mp_nexthop_local)
&& IPV4_ADDR_SAME(&attr1->mp_nexthop_global_in,
&attr2->mp_nexthop_global_in)
&& IPV4_ADDR_SAME(&attr1->originator_id,
&attr2->originator_id)
&& overlay_index_same(attr1, attr2)
&& !memcmp(&attr1->esi, &attr2->esi, sizeof(esi_t))
&& attr1->es_flags == attr2->es_flags
&& attr1->mm_sync_seqnum == attr2->mm_sync_seqnum
&& attr1->df_pref == attr2->df_pref
&& attr1->df_alg == attr2->df_alg
&& attr1->nh_ifindex == attr2->nh_ifindex
&& attr1->nh_lla_ifindex == attr2->nh_lla_ifindex
&& attr1->distance == attr2->distance
&& srv6_l3vpn_same(attr1->srv6_l3vpn, attr2->srv6_l3vpn)
&& srv6_vpn_same(attr1->srv6_vpn, attr2->srv6_vpn)
&& attr1->srte_color == attr2->srte_color
&& attr1->nh_type == attr2->nh_type
&& attr1->bh_type == attr2->bh_type)
return true;
}
return false;
}
static void attrhash_init(void)
{
attrhash =
hash_create(attrhash_key_make, attrhash_cmp, "BGP Attributes");
}
/*
* special for hash_clean below
*/
static void attr_vfree(void *attr)
{
XFREE(MTYPE_ATTR, attr);
}
static void attrhash_finish(void)
{
hash_clean(attrhash, attr_vfree);
hash_free(attrhash);
attrhash = NULL;
}
static void attr_show_all_iterator(struct hash_bucket *bucket, struct vty *vty)
{
struct attr *attr = bucket->data;
char sid_str[BUFSIZ];
vty_out(vty, "attr[%ld] nexthop %pI4\n", attr->refcnt, &attr->nexthop);
sid_str[0] = '\0';
if (attr->srv6_l3vpn)
inet_ntop(AF_INET6, &attr->srv6_l3vpn->sid, sid_str, BUFSIZ);
else if (attr->srv6_vpn)
inet_ntop(AF_INET6, &attr->srv6_vpn->sid, sid_str, BUFSIZ);
vty_out(vty,
"\tflags: %" PRIu64" distance: %u med: %u local_pref: %u origin: %u weight: %u label: %u sid: %s\n",
attr->flag, attr->distance, attr->med, attr->local_pref,
attr->origin, attr->weight, attr->label, sid_str);
}
void attr_show_all(struct vty *vty)
{
hash_iterate(attrhash, (void (*)(struct hash_bucket *,
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->encap_subtlvs) {
val->encap_subtlvs = NULL;
}
#ifdef ENABLE_BGP_VNC
struct bgp_attr_encap_subtlv *vnc_subtlvs =
bgp_attr_get_vnc_subtlvs(val);
if (vnc_subtlvs)
bgp_attr_set_vnc_subtlvs(val, NULL);
#endif
attr->refcnt = 0;
return attr;
}
/* Internet argument attribute. */
struct attr *bgp_attr_intern(struct attr *attr)
{
struct attr *find;
struct ecommunity *ecomm = NULL;
struct ecommunity *ipv6_ecomm = NULL;
struct lcommunity *lcomm = NULL;
struct community *comm = NULL;
/* Intern referenced strucutre. */
if (attr->aspath) {
if (!attr->aspath->refcnt)
attr->aspath = aspath_intern(attr->aspath);
else
attr->aspath->refcnt++;
}
comm = bgp_attr_get_community(attr);
if (comm) {
if (!comm->refcnt)
bgp_attr_set_community(attr, community_intern(comm));
else
comm->refcnt++;
}
ecomm = bgp_attr_get_ecommunity(attr);
if (ecomm) {
if (!ecomm->refcnt)
bgp_attr_set_ecommunity(attr, ecommunity_intern(ecomm));
else
ecomm->refcnt++;
}
ipv6_ecomm = bgp_attr_get_ipv6_ecommunity(attr);
if (ipv6_ecomm) {
if (!ipv6_ecomm->refcnt)
bgp_attr_set_ipv6_ecommunity(
attr, ecommunity_intern(ipv6_ecomm));
else
ipv6_ecomm->refcnt++;
}
lcomm = bgp_attr_get_lcommunity(attr);
if (lcomm) {
if (!lcomm->refcnt)
bgp_attr_set_lcommunity(attr, lcommunity_intern(lcomm));
else
lcomm->refcnt++;
}
struct cluster_list *cluster = bgp_attr_get_cluster(attr);
if (cluster) {
if (!cluster->refcnt)
bgp_attr_set_cluster(attr, cluster_intern(cluster));
else
cluster->refcnt++;
}
struct transit *transit = bgp_attr_get_transit(attr);
if (transit) {
if (!transit->refcnt)
bgp_attr_set_transit(attr, transit_intern(transit));
else
transit->refcnt++;
}
if (attr->encap_subtlvs) {
if (!attr->encap_subtlvs->refcnt)
attr->encap_subtlvs = encap_intern(attr->encap_subtlvs,
ENCAP_SUBTLV_TYPE);
else
attr->encap_subtlvs->refcnt++;
}
if (attr->srv6_l3vpn) {
if (!attr->srv6_l3vpn->refcnt)
attr->srv6_l3vpn = srv6_l3vpn_intern(attr->srv6_l3vpn);
else
attr->srv6_l3vpn->refcnt++;
}
if (attr->srv6_vpn) {
if (!attr->srv6_vpn->refcnt)
attr->srv6_vpn = srv6_vpn_intern(attr->srv6_vpn);
else
attr->srv6_vpn->refcnt++;
}
#ifdef ENABLE_BGP_VNC
struct bgp_attr_encap_subtlv *vnc_subtlvs =
bgp_attr_get_vnc_subtlvs(attr);
if (vnc_subtlvs) {
if (!vnc_subtlvs->refcnt)
bgp_attr_set_vnc_subtlvs(
attr,
encap_intern(vnc_subtlvs, VNC_SUBTLV_TYPE));
else
vnc_subtlvs->refcnt++;
}
#endif
/* At this point, attr only contains intern'd pointers. that means
* if we find it in attrhash, it has all the same pointers and we
* correctly updated the refcounts on these.
* If we don't find it, we need to allocate a one because in all
* cases this returns a new reference to a hashed attr, but the input
* wasn't on hash. */
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, uint8_t origin)
{
memset(attr, 0, sizeof(struct 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->weight = BGP_ATTR_DEFAULT_WEIGHT;
attr->tag = 0;
attr->label_index = BGP_INVALID_LABEL_INDEX;
attr->label = MPLS_INVALID_LABEL;
attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP);
attr->mp_nexthop_len = IPV6_MAX_BYTELEN;
return attr;
}
/* Create the attributes for an aggregate */
struct attr *bgp_attr_aggregate_intern(
struct bgp *bgp, uint8_t origin, struct aspath *aspath,
struct community *community, struct ecommunity *ecommunity,
struct lcommunity *lcommunity, struct bgp_aggregate *aggregate,
uint8_t atomic_aggregate, const struct prefix *p)
{
struct attr attr;
struct attr *new;
int ret;
memset(&attr, 0, sizeof(struct 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) {
uint32_t gshut = COMMUNITY_GSHUT;
/* If we are not shutting down ourselves and we are
* aggregating a route that contains the GSHUT community we
* need to remove that community when creating the aggregate */
if (!bgp_in_graceful_shutdown(bgp)
&& community_include(community, gshut)) {
community_del_val(community, &gshut);
}
bgp_attr_set_community(&attr, community);
attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES);
}
if (ecommunity) {
bgp_attr_set_ecommunity(&attr, ecommunity);
attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES);
}
if (lcommunity) {
bgp_attr_set_lcommunity(&attr, lcommunity);
attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES);
}
if (bgp_in_graceful_shutdown(bgp))
bgp_attr_add_gshut_community(&attr);
attr.label_index = BGP_INVALID_LABEL_INDEX;
attr.label = MPLS_INVALID_LABEL;
attr.weight = BGP_ATTR_DEFAULT_WEIGHT;
attr.mp_nexthop_len = IPV6_MAX_BYTELEN;
if (!aggregate->as_set || atomic_aggregate)
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))
attr.aggregator_as = bgp->confed_id;
else
attr.aggregator_as = bgp->as;
attr.aggregator_addr = bgp->router_id;
attr.label_index = BGP_INVALID_LABEL_INDEX;
attr.label = MPLS_INVALID_LABEL;
/* Apply route-map */
if (aggregate->rmap.name) {
struct attr attr_tmp = attr;
struct bgp_path_info rmap_path;
memset(&rmap_path, 0, sizeof(struct bgp_path_info));
rmap_path.peer = bgp->peer_self;
rmap_path.attr = &attr_tmp;
SET_FLAG(bgp->peer_self->rmap_type, PEER_RMAP_TYPE_AGGREGATE);
ret = route_map_apply(aggregate->rmap.map, p, &rmap_path);
bgp->peer_self->rmap_type = 0;
if (ret == RMAP_DENYMATCH) {
/* Free uninterned attribute. */
bgp_attr_flush(&attr_tmp);
/* Unintern original. */
aspath_unintern(&attr.aspath);
return NULL;
}
if (bgp_in_graceful_shutdown(bgp))
bgp_attr_add_gshut_community(&attr_tmp);
new = bgp_attr_intern(&attr_tmp);
} else {
if (bgp_in_graceful_shutdown(bgp))
bgp_attr_add_gshut_community(&attr);
new = bgp_attr_intern(&attr);
}
/* Always release the 'intern()'ed AS Path. */
aspath_unintern(&attr.aspath);
return new;
}
/* Unintern just the sub-components of the attr, but not the attr */
void bgp_attr_unintern_sub(struct attr *attr)
{
struct ecommunity *ecomm = NULL;
struct ecommunity *ipv6_ecomm = NULL;
struct cluster_list *cluster;
struct lcommunity *lcomm = NULL;
struct community *comm = NULL;
/* aspath refcount shoud be decrement. */
aspath_unintern(&attr->aspath);
UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH));
comm = bgp_attr_get_community(attr);
community_unintern(&comm);
UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES));
bgp_attr_set_community(attr, NULL);
ecomm = bgp_attr_get_ecommunity(attr);
ecommunity_unintern(&ecomm);
UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES));
bgp_attr_set_ecommunity(attr, NULL);
ipv6_ecomm = bgp_attr_get_ipv6_ecommunity(attr);
ecommunity_unintern(&ipv6_ecomm);
UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_IPV6_EXT_COMMUNITIES));
bgp_attr_set_ipv6_ecommunity(attr, NULL);
lcomm = bgp_attr_get_lcommunity(attr);
lcommunity_unintern(&lcomm);
UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES));
bgp_attr_set_lcommunity(attr, NULL);
cluster = bgp_attr_get_cluster(attr);
if (cluster) {
cluster_unintern(&cluster);
bgp_attr_set_cluster(attr, cluster);
}
UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST));
struct transit *transit = bgp_attr_get_transit(attr);
if (transit) {
transit_unintern(&transit);
bgp_attr_set_transit(attr, transit);
}
if (attr->encap_subtlvs)
encap_unintern(&attr->encap_subtlvs, ENCAP_SUBTLV_TYPE);
#ifdef ENABLE_BGP_VNC
struct bgp_attr_encap_subtlv *vnc_subtlvs =
bgp_attr_get_vnc_subtlvs(attr);
if (vnc_subtlvs) {
encap_unintern(&vnc_subtlvs, VNC_SUBTLV_TYPE);
bgp_attr_set_vnc_subtlvs(attr, vnc_subtlvs);
}
#endif
if (attr->srv6_l3vpn)
srv6_l3vpn_unintern(&attr->srv6_l3vpn);
if (attr->srv6_vpn)
srv6_vpn_unintern(&attr->srv6_vpn);
}
/* Free bgp attribute and aspath. */
void bgp_attr_unintern(struct attr **pattr)
{
struct attr *attr = *pattr;
struct attr *ret;
struct attr tmp;
/* Decrement attribute reference. */
attr->refcnt--;
tmp = *attr;
/* If reference becomes zero then free attribute object. */
if (attr->refcnt == 0) {
ret = hash_release(attrhash, attr);
assert(ret != NULL);
XFREE(MTYPE_ATTR, attr);
*pattr = NULL;
}
bgp_attr_unintern_sub(&tmp);
}
void bgp_attr_flush(struct attr *attr)
{
struct ecommunity *ecomm;
struct ecommunity *ipv6_ecomm;
struct cluster_list *cluster;
struct lcommunity *lcomm;
struct community *comm;
if (attr->aspath && !attr->aspath->refcnt) {
aspath_free(attr->aspath);
attr->aspath = NULL;
}
comm = bgp_attr_get_community(attr);
if (comm && !comm->refcnt)
community_free(&comm);
bgp_attr_set_community(attr, NULL);
ecomm = bgp_attr_get_ecommunity(attr);
if (ecomm && !ecomm->refcnt)
ecommunity_free(&ecomm);
bgp_attr_set_ecommunity(attr, NULL);
ipv6_ecomm = bgp_attr_get_ipv6_ecommunity(attr);
if (ipv6_ecomm && !ipv6_ecomm->refcnt)
ecommunity_free(&ipv6_ecomm);
bgp_attr_set_ipv6_ecommunity(attr, NULL);
lcomm = bgp_attr_get_lcommunity(attr);
if (lcomm && !lcomm->refcnt)
lcommunity_free(&lcomm);
bgp_attr_set_lcommunity(attr, NULL);
cluster = bgp_attr_get_cluster(attr);
if (cluster && !cluster->refcnt) {
cluster_free(cluster);
bgp_attr_set_cluster(attr, NULL);
}
struct transit *transit = bgp_attr_get_transit(attr);
if (transit && !transit->refcnt) {
transit_free(transit);
bgp_attr_set_transit(attr, NULL);
}
if (attr->encap_subtlvs && !attr->encap_subtlvs->refcnt) {
encap_free(attr->encap_subtlvs);
attr->encap_subtlvs = NULL;
}
if (attr->srv6_l3vpn && !attr->srv6_l3vpn->refcnt) {
srv6_l3vpn_free(attr->srv6_l3vpn);
attr->srv6_l3vpn = NULL;
}
if (attr->srv6_vpn && !attr->srv6_vpn->refcnt) {
srv6_vpn_free(attr->srv6_vpn);
attr->srv6_vpn = NULL;
}
#ifdef ENABLE_BGP_VNC
struct bgp_attr_encap_subtlv *vnc_subtlvs =
bgp_attr_get_vnc_subtlvs(attr);
if (vnc_subtlvs && !vnc_subtlvs->refcnt) {
encap_free(vnc_subtlvs);
bgp_attr_set_vnc_subtlvs(attr, NULL);
}
#endif
}
/* Implement draft-scudder-idr-optional-transitive behaviour and
* avoid resetting sessions for malformed attributes which are
* are partial/optional and hence where the error likely was not
* introduced by the sending neighbour.
*/
static bgp_attr_parse_ret_t
bgp_attr_malformed(struct bgp_attr_parser_args *args, uint8_t subcode,
bgp_size_t length)
{
struct peer *const peer = args->peer;
struct attr *const attr = args->attr;
const uint8_t flags = args->flags;
/* startp and length must be special-cased, as whether or not to
* send the attribute data with the NOTIFY depends on the error,
* the caller therefore signals this with the seperate length argument
*/
uint8_t *notify_datap = (length > 0 ? args->startp : NULL);
if (bgp_debug_update(peer, NULL, NULL, 1)) {
char attr_str[BUFSIZ] = {0};
bgp_dump_attr(attr, attr_str, sizeof(attr_str));
zlog_debug("%s: attributes: %s", __func__, attr_str);
}
/* Only relax error handling for eBGP peers */
if (peer->sort != BGP_PEER_EBGP) {
bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode,
notify_datap, length);
return BGP_ATTR_PARSE_ERROR;
}
/* Adjust the stream getp to the end of the attribute, in case we can
* still proceed but the caller hasn't read all the attribute.
*/
stream_set_getp(BGP_INPUT(peer),
(args->startp - STREAM_DATA(BGP_INPUT(peer)))
+ args->total);
switch (args->type) {
/* where an attribute is relatively inconsequential, e.g. it does not
* affect route selection, and can be safely ignored, then any such
* attributes which are malformed should just be ignored and the route
* processed as normal.
*/
case BGP_ATTR_AS4_AGGREGATOR:
case BGP_ATTR_AGGREGATOR:
case BGP_ATTR_ATOMIC_AGGREGATE:
return BGP_ATTR_PARSE_PROCEED;
/* Core attributes, particularly ones which may influence route
* selection, should be treat-as-withdraw.
*/
case BGP_ATTR_ORIGIN:
case BGP_ATTR_AS_PATH:
case BGP_ATTR_NEXT_HOP:
case BGP_ATTR_MULTI_EXIT_DISC:
case BGP_ATTR_LOCAL_PREF:
case BGP_ATTR_COMMUNITIES:
case BGP_ATTR_EXT_COMMUNITIES:
case BGP_ATTR_IPV6_EXT_COMMUNITIES:
case BGP_ATTR_LARGE_COMMUNITIES:
case BGP_ATTR_ORIGINATOR_ID:
case BGP_ATTR_CLUSTER_LIST:
return BGP_ATTR_PARSE_WITHDRAW;
case BGP_ATTR_MP_REACH_NLRI:
case BGP_ATTR_MP_UNREACH_NLRI:
bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, subcode,
notify_datap, length);
return BGP_ATTR_PARSE_ERROR;
}
/* Partial optional attributes that are malformed should not cause
* the whole session to be reset. Instead treat it as a withdrawal
* of the routes, if possible.
*/
if (CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)
&& CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL)
&& CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL))
return BGP_ATTR_PARSE_WITHDRAW;
/* default to reset */
return BGP_ATTR_PARSE_ERROR_NOTIFYPLS;
}
/* Find out what is wrong with the path attribute flag bits and log the error.
"Flag bits" here stand for Optional, Transitive and Partial, but not for
Extended Length. Checking O/T/P bits at once implies, that the attribute
being diagnosed is defined by RFC as either a "well-known" or an "optional,
non-transitive" attribute. */
static void
bgp_attr_flags_diagnose(struct bgp_attr_parser_args *args,
uint8_t desired_flags /* how RFC says it must be */
)
{
uint8_t seen = 0, i;
uint8_t real_flags = args->flags;
const uint8_t attr_code = args->type;
desired_flags &= ~BGP_ATTR_FLAG_EXTLEN;
real_flags &= ~BGP_ATTR_FLAG_EXTLEN;
for (i = 0; i <= 2; i++) /* O,T,P, but not E */
if (CHECK_FLAG(desired_flags, attr_flag_str[i].key)
!= CHECK_FLAG(real_flags, attr_flag_str[i].key)) {
flog_err(EC_BGP_ATTR_FLAG,
"%s attribute must%s be flagged as \"%s\"",
lookup_msg(attr_str, attr_code, NULL),
CHECK_FLAG(desired_flags, attr_flag_str[i].key)
? ""
: " not",
attr_flag_str[i].str);
seen = 1;
}
if (!seen) {
zlog_debug(
"Strange, %s called for attr %s, but no problem found with flags (real flags 0x%x, desired 0x%x)",
__func__, lookup_msg(attr_str, attr_code, NULL),
real_flags, desired_flags);
}
}
/* Required flags for attributes. EXTLEN will be masked off when testing,
* as will PARTIAL for optional+transitive attributes.
*/
const uint8_t attr_flags_values[] = {
[BGP_ATTR_ORIGIN] = BGP_ATTR_FLAG_TRANS,
[BGP_ATTR_AS_PATH] = BGP_ATTR_FLAG_TRANS,
[BGP_ATTR_NEXT_HOP] = BGP_ATTR_FLAG_TRANS,
[BGP_ATTR_MULTI_EXIT_DISC] = BGP_ATTR_FLAG_OPTIONAL,
[BGP_ATTR_LOCAL_PREF] = BGP_ATTR_FLAG_TRANS,
[BGP_ATTR_ATOMIC_AGGREGATE] = BGP_ATTR_FLAG_TRANS,
[BGP_ATTR_AGGREGATOR] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL,
[BGP_ATTR_COMMUNITIES] = BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL,
[BGP_ATTR_ORIGINATOR_ID] = BGP_ATTR_FLAG_OPTIONAL,
[BGP_ATTR_CLUSTER_LIST] = BGP_ATTR_FLAG_OPTIONAL,
[BGP_ATTR_MP_REACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL,
[BGP_ATTR_MP_UNREACH_NLRI] = BGP_ATTR_FLAG_OPTIONAL,
[BGP_ATTR_EXT_COMMUNITIES] =
BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS,
[BGP_ATTR_AS4_PATH] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS,
[BGP_ATTR_AS4_AGGREGATOR] =
BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS,
[BGP_ATTR_PMSI_TUNNEL] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS,
[BGP_ATTR_LARGE_COMMUNITIES] =
BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS,
[BGP_ATTR_PREFIX_SID] = BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS,
[BGP_ATTR_IPV6_EXT_COMMUNITIES] =
BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS,
};
static const size_t attr_flags_values_max = array_size(attr_flags_values) - 1;
static bool bgp_attr_flag_invalid(struct bgp_attr_parser_args *args)
{
uint8_t mask = BGP_ATTR_FLAG_EXTLEN;
const uint8_t flags = args->flags;
const uint8_t attr_code = args->type;
/* there may be attributes we don't know about */
if (attr_code > attr_flags_values_max)
return false;
if (attr_flags_values[attr_code] == 0)
return false;
/* RFC4271, "For well-known attributes, the Transitive bit MUST be set
* to
* 1."
*/
if (!CHECK_FLAG(BGP_ATTR_FLAG_OPTIONAL, flags)
&& !CHECK_FLAG(BGP_ATTR_FLAG_TRANS, flags)) {
flog_err(
EC_BGP_ATTR_FLAG,
"%s well-known attributes must have transitive flag set (%x)",
lookup_msg(attr_str, attr_code, NULL), flags);
return true;
}
/* "For well-known attributes and for optional non-transitive
* attributes,
* the Partial bit MUST be set to 0."
*/
if (CHECK_FLAG(flags, BGP_ATTR_FLAG_PARTIAL)) {
if (!CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL)) {
flog_err(EC_BGP_ATTR_FLAG,
"%s well-known attribute must NOT have the partial flag set (%x)",
lookup_msg(attr_str, attr_code, NULL), flags);
return true;
}
if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL)
&& !CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS)) {
flog_err(EC_BGP_ATTR_FLAG,
"%s optional + transitive attribute must NOT have the partial flag set (%x)",
lookup_msg(attr_str, attr_code, NULL), flags);
return true;
}
}
/* Optional transitive attributes may go through speakers that don't
* reocgnise them and set the Partial bit.
*/
if (CHECK_FLAG(flags, BGP_ATTR_FLAG_OPTIONAL)
&& CHECK_FLAG(flags, BGP_ATTR_FLAG_TRANS))
SET_FLAG(mask, BGP_ATTR_FLAG_PARTIAL);
if ((flags & ~mask) == attr_flags_values[attr_code])
return false;
bgp_attr_flags_diagnose(args, attr_flags_values[attr_code]);
return true;
}
/* Get origin attribute of the update message. */
static bgp_attr_parse_ret_t bgp_attr_origin(struct bgp_attr_parser_args *args)
{
struct peer *const peer = args->peer;
struct attr *const attr = args->attr;
const bgp_size_t length = args->length;
/* 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) {
flog_err(EC_BGP_ATTR_LEN,
"Origin attribute length is not one %d", length);
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
/* 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)) {
flog_err(EC_BGP_ATTR_ORIGIN,
"Origin attribute value is invalid %d", attr->origin);
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_INVAL_ORIGIN,
args->total);
}
/* 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. */
static int bgp_attr_aspath(struct bgp_attr_parser_args *args)
{
struct attr *const attr = args->attr;
struct peer *const peer = args->peer;
const bgp_size_t length = args->length;
/*
* peer with AS4 => will get 4Byte ASnums
* otherwise, will get 16 Bit
*/
attr->aspath = aspath_parse(
peer->curr, length,
CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)
&& CHECK_FLAG(peer->cap, PEER_CAP_AS4_ADV));
/* In case of IBGP, length will be zero. */
if (!attr->aspath) {
flog_err(EC_BGP_ATTR_MAL_AS_PATH,
"Malformed AS path from %s, length is %d", peer->host,
length);
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH,
0);
}
/* Set aspath attribute flag. */
attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS_PATH);
return BGP_ATTR_PARSE_PROCEED;
}
static bgp_attr_parse_ret_t bgp_attr_aspath_check(struct peer *const peer,
struct attr *const 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 aspath *aspath;
/* Confederation sanity check. */
if ((peer->sort == BGP_PEER_CONFED
&& !aspath_left_confed_check(attr->aspath))
|| (peer->sort == BGP_PEER_EBGP
&& aspath_confed_check(attr->aspath))) {
flog_err(EC_BGP_ATTR_MAL_AS_PATH, "Malformed AS path from %s",
peer->host);
return BGP_ATTR_PARSE_WITHDRAW;
}
/* First AS check for EBGP. */
if (CHECK_FLAG(peer->flags, PEER_FLAG_ENFORCE_FIRST_AS)) {
if (peer->sort == BGP_PEER_EBGP
&& !aspath_firstas_check(attr->aspath, peer->as)) {
flog_err(EC_BGP_ATTR_FIRST_AS,
"%s incorrect first AS (must be %u)",
peer->host, peer->as);
return BGP_ATTR_PARSE_WITHDRAW;
}
}
/* Codification of AS 0 Processing */
if (peer->sort == BGP_PEER_EBGP && aspath_check_as_zero(attr->aspath)) {
flog_err(
EC_BGP_ATTR_MAL_AS_PATH,
"Malformed AS path, AS number is 0 in the path from %s",
peer->host);
return BGP_ATTR_PARSE_WITHDRAW;
}
/* 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 BGP_ATTR_PARSE_PROCEED;
}
/* Parse AS4 path information. This function is another wrapper of
aspath_parse. */
static int bgp_attr_as4_path(struct bgp_attr_parser_args *args,
struct aspath **as4_path)
{
struct peer *const peer = args->peer;
struct attr *const attr = args->attr;
const bgp_size_t length = args->length;
*as4_path = aspath_parse(peer->curr, length, 1);
/* In case of IBGP, length will be zero. */
if (!*as4_path) {
flog_err(EC_BGP_ATTR_MAL_AS_PATH,
"Malformed AS4 path from %s, length is %d", peer->host,
length);
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH,
0);
}
/* Set aspath attribute flag. */
attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_PATH);
return BGP_ATTR_PARSE_PROCEED;
}
/*
* Check that the nexthop attribute is valid.
*/
bgp_attr_parse_ret_t
bgp_attr_nexthop_valid(struct peer *peer, struct attr *attr)
{
in_addr_t nexthop_h;
nexthop_h = ntohl(attr->nexthop.s_addr);
if ((IPV4_NET0(nexthop_h) || IPV4_NET127(nexthop_h)
|| IPV4_CLASS_DE(nexthop_h))
&& !BGP_DEBUG(allow_martians, ALLOW_MARTIANS)) {
uint8_t data[7]; /* type(2) + length(1) + nhop(4) */
char buf[INET_ADDRSTRLEN];
inet_ntop(AF_INET, &attr->nexthop.s_addr, buf,
INET_ADDRSTRLEN);
flog_err(EC_BGP_ATTR_MARTIAN_NH, "Martian nexthop %s",
buf);
data[0] = BGP_ATTR_FLAG_TRANS;
data[1] = BGP_ATTR_NEXT_HOP;
data[2] = BGP_ATTR_NHLEN_IPV4;
memcpy(&data[3], &attr->nexthop.s_addr, BGP_ATTR_NHLEN_IPV4);
bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_INVAL_NEXT_HOP,
data, 7);
return BGP_ATTR_PARSE_ERROR;
}
return BGP_ATTR_PARSE_PROCEED;
}
/* Nexthop attribute. */
static bgp_attr_parse_ret_t bgp_attr_nexthop(struct bgp_attr_parser_args *args)
{
struct peer *const peer = args->peer;
struct attr *const attr = args->attr;
const bgp_size_t length = args->length;
/* Check nexthop attribute length. */
if (length != 4) {
flog_err(EC_BGP_ATTR_LEN,
"Nexthop attribute length isn't four [%d]", length);
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
attr->nexthop.s_addr = stream_get_ipv4(peer->curr);
attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP);
return BGP_ATTR_PARSE_PROCEED;
}
/* MED atrribute. */
static bgp_attr_parse_ret_t bgp_attr_med(struct bgp_attr_parser_args *args)
{
struct peer *const peer = args->peer;
struct attr *const attr = args->attr;
const bgp_size_t length = args->length;
/* Length check. */
if (length != 4) {
flog_err(EC_BGP_ATTR_LEN,
"MED attribute length isn't four [%d]", length);
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
attr->med = stream_getl(peer->curr);
attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC);
return BGP_ATTR_PARSE_PROCEED;
}
/* Local preference attribute. */
static bgp_attr_parse_ret_t
bgp_attr_local_pref(struct bgp_attr_parser_args *args)
{
struct peer *const peer = args->peer;
struct attr *const attr = args->attr;
const bgp_size_t length = args->length;
/* if received from an internal neighbor, it SHALL be considered
* malformed if its length is not equal to 4. If malformed, the
* UPDATE message SHALL be handled using the approach of "treat-as-
* withdraw".
*/
if (peer->sort == BGP_PEER_IBGP && length != 4) {
flog_err(EC_BGP_ATTR_LEN,
"LOCAL_PREF attribute length isn't 4 [%u]", length);
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
/* 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 == BGP_PEER_EBGP) {
STREAM_FORWARD_GETP(peer->curr, length);
return BGP_ATTR_PARSE_PROCEED;
}
STREAM_GETL(peer->curr, attr->local_pref);
/* Set the local-pref flag. */
attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF);
return BGP_ATTR_PARSE_PROCEED;
stream_failure:
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
/* Atomic aggregate. */
static int bgp_attr_atomic(struct bgp_attr_parser_args *args)
{
struct attr *const attr = args->attr;
const bgp_size_t length = args->length;
/* Length check. */
if (length != 0) {
flog_err(EC_BGP_ATTR_LEN,
"ATOMIC_AGGREGATE attribute length isn't 0 [%u]",
length);
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
/* Set atomic aggregate flag. */
attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE);
return BGP_ATTR_PARSE_PROCEED;
}
/* Aggregator attribute */
static int bgp_attr_aggregator(struct bgp_attr_parser_args *args)
{
struct peer *const peer = args->peer;
struct attr *const attr = args->attr;
const bgp_size_t length = args->length;
as_t aggregator_as;
int wantedlen = 6;
/* peer with AS4 will send 4 Byte AS, peer without will send 2 Byte */
if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)
&& CHECK_FLAG(peer->cap, PEER_CAP_AS4_ADV))
wantedlen = 8;
if (length != wantedlen) {
flog_err(EC_BGP_ATTR_LEN,
"AGGREGATOR attribute length isn't %u [%u]", wantedlen,
length);
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
if (CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV))
aggregator_as = stream_getl(peer->curr);
else
aggregator_as = stream_getw(peer->curr);
attr->aggregator_as = aggregator_as;
attr->aggregator_addr.s_addr = stream_get_ipv4(peer->curr);
/* Codification of AS 0 Processing */
if (aggregator_as == BGP_AS_ZERO) {
flog_err(EC_BGP_ATTR_LEN,
"%s: AGGREGATOR AS number is 0 for aspath: %s",
peer->host, aspath_print(attr->aspath));
if (bgp_debug_update(peer, NULL, NULL, 1)) {
char attr_str[BUFSIZ] = {0};
bgp_dump_attr(attr, attr_str, sizeof(attr_str));
zlog_debug("%s: attributes: %s", __func__, attr_str);
}
} else {
attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR);
}
return BGP_ATTR_PARSE_PROCEED;
}
/* New Aggregator attribute */
static bgp_attr_parse_ret_t
bgp_attr_as4_aggregator(struct bgp_attr_parser_args *args,
as_t *as4_aggregator_as,
struct in_addr *as4_aggregator_addr)
{
struct peer *const peer = args->peer;
struct attr *const attr = args->attr;
const bgp_size_t length = args->length;
as_t aggregator_as;
if (length != 8) {
flog_err(EC_BGP_ATTR_LEN, "New Aggregator length is not 8 [%d]",
length);
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
0);
}
aggregator_as = stream_getl(peer->curr);
*as4_aggregator_as = aggregator_as;
as4_aggregator_addr->s_addr = stream_get_ipv4(peer->curr);
/* Codification of AS 0 Processing */
if (aggregator_as == BGP_AS_ZERO) {
flog_err(EC_BGP_ATTR_LEN,
"%s: AS4_AGGREGATOR AS number is 0 for aspath: %s",
peer->host, aspath_print(attr->aspath));
if (bgp_debug_update(peer, NULL, NULL, 1)) {
char attr_str[BUFSIZ] = {0};
bgp_dump_attr(attr, attr_str, sizeof(attr_str));
zlog_debug("%s: attributes: %s", __func__, attr_str);
}
} else {
attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR);
}
return BGP_ATTR_PARSE_PROCEED;
}
/* Munge Aggregator and New-Aggregator, AS_PATH and NEW_AS_PATH.
*/
static bgp_attr_parse_ret_t
bgp_attr_munge_as4_attrs(struct peer *const peer, struct attr *const attr,
struct aspath *as4_path, as_t as4_aggregator,
struct in_addr *as4_aggregator_addr)
{
int ignore_as4_path = 0;
struct aspath *newpath;
if (!attr->aspath) {
/* NULL aspath shouldn't be possible as bgp_attr_parse should
* have
* checked that all well-known, mandatory attributes were
* present.
*
* Can only be a problem with peer itself - hard error
*/
return BGP_ATTR_PARSE_ERROR;
}
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 BGP_ATTR_PARSE_PROCEED;
}
/* 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))) {
/* 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 (attr->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"
*/
attr->aggregator_as = as4_aggregator;
attr->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);
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);
if (!newpath)
return BGP_ATTR_PARSE_ERROR;
aspath_unintern(&attr->aspath);
attr->aspath = aspath_intern(newpath);
}
return BGP_ATTR_PARSE_PROCEED;
}
/* Community attribute. */
static bgp_attr_parse_ret_t
bgp_attr_community(struct bgp_attr_parser_args *args)
{
struct peer *const peer = args->peer;
struct attr *const attr = args->attr;
const bgp_size_t length = args->length;
if (length == 0) {
bgp_attr_set_community(attr, NULL);
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
args->total);
}
bgp_attr_set_community(
attr,
community_parse((uint32_t *)stream_pnt(peer->curr), length));
/* XXX: fix community_parse to use stream API and remove this */
stream_forward_getp(peer->curr, length);
/* The Community attribute SHALL be considered malformed if its
* length is not a non-zero multiple of 4.
*/
if (!bgp_attr_get_community(attr))
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
args->total);
attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES);
return BGP_ATTR_PARSE_PROCEED;
}
/* Originator ID attribute. */
static bgp_attr_parse_ret_t
bgp_attr_originator_id(struct bgp_attr_parser_args *args)
{
struct peer *const peer = args->peer;
struct attr *const attr = args->attr;
const bgp_size_t length = args->length;
/* if received from an internal neighbor, it SHALL be considered
* malformed if its length is not equal to 4. If malformed, the
* UPDATE message SHALL be handled using the approach of "treat-as-
* withdraw".
*/
if (length != 4) {
flog_err(EC_BGP_ATTR_LEN, "Bad originator ID length %d",
length);
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
attr->originator_id.s_addr = stream_get_ipv4(peer->curr);
attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_ORIGINATOR_ID);
return BGP_ATTR_PARSE_PROCEED;
}
/* Cluster list attribute. */
static bgp_attr_parse_ret_t
bgp_attr_cluster_list(struct bgp_attr_parser_args *args)
{
struct peer *const peer = args->peer;
struct attr *const attr = args->attr;
const bgp_size_t length = args->length;
/* if received from an internal neighbor, it SHALL be considered
* malformed if its length is not a non-zero multiple of 4. If
* malformed, the UPDATE message SHALL be handled using the approach
* of "treat-as-withdraw".
*/
if (length == 0 || length % 4) {
flog_err(EC_BGP_ATTR_LEN, "Bad cluster list length %d", length);
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
bgp_attr_set_cluster(
attr, cluster_parse((struct in_addr *)stream_pnt(peer->curr),
length));
/* XXX: Fix cluster_parse to use stream API and then remove this */
stream_forward_getp(peer->curr, length);
attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST);
return BGP_ATTR_PARSE_PROCEED;
}
/* Multiprotocol reachability information parse. */
int bgp_mp_reach_parse(struct bgp_attr_parser_args *args,
struct bgp_nlri *mp_update)
{
iana_afi_t pkt_afi;
afi_t afi;
iana_safi_t pkt_safi;
safi_t safi;
bgp_size_t nlri_len;
size_t start;
struct stream *s;
struct peer *const peer = args->peer;
struct attr *const attr = args->attr;
const bgp_size_t length = args->length;
/* 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, of MP_REACH_NLRI",
__func__, peer->host, (unsigned long)length);
return BGP_ATTR_PARSE_ERROR_NOTIFYPLS;
}
/* Load AFI, SAFI. */
pkt_afi = stream_getw(s);
pkt_safi = stream_getc(s);
/* Convert AFI, SAFI to internal values, check. */
if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) {
/* Log if AFI or SAFI is unrecognized. This is not an error
* unless
* the attribute is otherwise malformed.
*/
if (bgp_debug_update(peer, NULL, NULL, 0))
zlog_debug(
"%s sent unrecognizable AFI, %s or, SAFI, %s, of MP_REACH_NLRI",
peer->host, iana_afi2str(pkt_afi),
iana_safi2str(pkt_safi));
return BGP_ATTR_PARSE_ERROR;
}
/* Get nexthop length. */
attr->mp_nexthop_len = stream_getc(s);
if (LEN_LEFT < attr->mp_nexthop_len) {
zlog_info(
"%s: %s sent next-hop length, %u, in MP_REACH_NLRI which goes past the end of attribute",
__func__, peer->host, attr->mp_nexthop_len);
return BGP_ATTR_PARSE_ERROR_NOTIFYPLS;
}
/* Nexthop length check. */
switch (attr->mp_nexthop_len) {
case 0:
if (safi != SAFI_FLOWSPEC) {
zlog_info("%s: %s sent wrong next-hop length, %d, in MP_REACH_NLRI",
__func__, peer->host, attr->mp_nexthop_len);
return BGP_ATTR_PARSE_ERROR_NOTIFYPLS;
}
break;
case BGP_ATTR_NHLEN_VPNV4:
stream_getl(s); /* RD high */
stream_getl(s); /* RD low */
/*
* NOTE: intentional fall through
* - for consistency in rx processing
*
* The following comment is to signal GCC this intention
* and suppress the warning
*/
/* FALLTHRU */
case BGP_ATTR_NHLEN_IPV4:
stream_get(&attr->mp_nexthop_global_in, s, IPV4_MAX_BYTELEN);
/* Probably needed for RFC 2283 */
if (attr->nexthop.s_addr == INADDR_ANY)
memcpy(&attr->nexthop.s_addr,
&attr->mp_nexthop_global_in, IPV4_MAX_BYTELEN);
break;
case BGP_ATTR_NHLEN_IPV6_GLOBAL:
case BGP_ATTR_NHLEN_VPNV6_GLOBAL:
if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_VPNV6_GLOBAL) {
stream_getl(s); /* RD high */
stream_getl(s); /* RD low */
}
stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN);
if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global)) {
if (!peer->nexthop.ifp) {
zlog_warn("%s sent a v6 global attribute but address is a V6 LL and there's no peer interface information. Hence, withdrawing",
peer->host);
return BGP_ATTR_PARSE_WITHDRAW;
}
attr->nh_ifindex = peer->nexthop.ifp->ifindex;
}
break;
case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL:
case BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL:
if (attr->mp_nexthop_len
== BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) {
stream_getl(s); /* RD high */
stream_getl(s); /* RD low */
}
stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN);
if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global)) {
if (!peer->nexthop.ifp) {
zlog_warn("%s sent a v6 global and LL attribute but global address is a V6 LL and there's no peer interface information. Hence, withdrawing",
peer->host);
return BGP_ATTR_PARSE_WITHDRAW;
}
attr->nh_ifindex = peer->nexthop.ifp->ifindex;
}
if (attr->mp_nexthop_len
== BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) {
stream_getl(s); /* RD high */
stream_getl(s); /* RD low */
}
stream_get(&attr->mp_nexthop_local, s, IPV6_MAX_BYTELEN);
if (!IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_local)) {
if (bgp_debug_update(peer, NULL, NULL, 1))
zlog_debug(
"%s sent next-hops %pI6 and %pI6. Ignoring non-LL value",
peer->host, &attr->mp_nexthop_global,
&attr->mp_nexthop_local);
attr->mp_nexthop_len = IPV6_MAX_BYTELEN;
}
if (!peer->nexthop.ifp) {
zlog_warn("%s sent a v6 LL next-hop and there's no peer interface information. Hence, withdrawing",
peer->host);
return BGP_ATTR_PARSE_WITHDRAW;
}
attr->nh_lla_ifindex = peer->nexthop.ifp->ifindex;
break;
default:
zlog_info("%s: %s sent wrong next-hop length, %d, in MP_REACH_NLRI",
__func__, peer->host, attr->mp_nexthop_len);
return BGP_ATTR_PARSE_ERROR_NOTIFYPLS;
}
if (!LEN_LEFT) {
zlog_info("%s: %s sent SNPA which couldn't be read",
__func__, peer->host);
return BGP_ATTR_PARSE_ERROR_NOTIFYPLS;
}
{
uint8_t val;
if ((val = stream_getc(s)))
flog_warn(
EC_BGP_DEFUNCT_SNPA_LEN,
"%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 > STREAM_READABLE(s)) {
zlog_info("%s: %s sent MP_REACH_NLRI which couldn't be read",
__func__, peer->host);
return BGP_ATTR_PARSE_ERROR_NOTIFYPLS;
}
if (!nlri_len) {
zlog_info("%s: %s sent a zero-length NLRI. Hence, treating as a EOR marker",
__func__, peer->host);
mp_update->afi = afi;
mp_update->safi = safi;
return BGP_ATTR_PARSE_EOR;
}
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);
attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI);
return BGP_ATTR_PARSE_PROCEED;
#undef LEN_LEFT
}
/* Multiprotocol unreachable parse */
int bgp_mp_unreach_parse(struct bgp_attr_parser_args *args,
struct bgp_nlri *mp_withdraw)
{
struct stream *s;
iana_afi_t pkt_afi;
afi_t afi;
iana_safi_t pkt_safi;
safi_t safi;
uint16_t withdraw_len;
struct peer *const peer = args->peer;
struct attr *const attr = args->attr;
const bgp_size_t length = args->length;
s = peer->curr;
#define BGP_MP_UNREACH_MIN_SIZE 3
if ((length > STREAM_READABLE(s)) || (length < BGP_MP_UNREACH_MIN_SIZE))
return BGP_ATTR_PARSE_ERROR_NOTIFYPLS;
pkt_afi = stream_getw(s);
pkt_safi = stream_getc(s);
/* Convert AFI, SAFI to internal values, check. */
if (bgp_map_afi_safi_iana2int(pkt_afi, pkt_safi, &afi, &safi)) {
/* Log if AFI or SAFI is unrecognized. This is not an error
* unless
* the attribute is otherwise malformed.
*/
if (bgp_debug_update(peer, NULL, NULL, 0))
zlog_debug(
"%s: MP_UNREACH received AFI %s or SAFI %s is unrecognized",
peer->host, iana_afi2str(pkt_afi),
iana_safi2str(pkt_safi));
return BGP_ATTR_PARSE_ERROR;
}
withdraw_len = length - BGP_MP_UNREACH_MIN_SIZE;
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);
attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI);
return BGP_ATTR_PARSE_PROCEED;
}
/* Large Community attribute. */
static bgp_attr_parse_ret_t
bgp_attr_large_community(struct bgp_attr_parser_args *args)
{
struct peer *const peer = args->peer;
struct attr *const attr = args->attr;
const bgp_size_t length = args->length;
/*
* Large community follows new attribute format.
*/
if (length == 0) {
bgp_attr_set_lcommunity(attr, NULL);
/* Empty extcomm doesn't seem to be invalid per se */
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
args->total);
}
bgp_attr_set_lcommunity(
attr, lcommunity_parse(stream_pnt(peer->curr), length));
/* XXX: fix ecommunity_parse to use stream API */
stream_forward_getp(peer->curr, length);
if (!bgp_attr_get_lcommunity(attr))
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
args->total);
attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES);
return BGP_ATTR_PARSE_PROCEED;
}
/* Extended Community attribute. */
static bgp_attr_parse_ret_t
bgp_attr_ext_communities(struct bgp_attr_parser_args *args)
{
struct peer *const peer = args->peer;
struct attr *const attr = args->attr;
const bgp_size_t length = args->length;
uint8_t sticky = 0;
bool proxy = false;
struct ecommunity *ecomm;
if (length == 0) {
bgp_attr_set_ecommunity(attr, NULL);
/* Empty extcomm doesn't seem to be invalid per se */
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
args->total);
}
ecomm = ecommunity_parse(
stream_pnt(peer->curr), length,
CHECK_FLAG(peer->flags,
PEER_FLAG_DISABLE_LINK_BW_ENCODING_IEEE));
bgp_attr_set_ecommunity(attr, ecomm);
/* XXX: fix ecommunity_parse to use stream API */
stream_forward_getp(peer->curr, length);
/* The Extended Community attribute SHALL be considered malformed if
* its length is not a non-zero multiple of 8.
*/
if (!bgp_attr_get_ecommunity(attr))
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
args->total);
attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES);
/* Extract DF election preference and mobility sequence number */
attr->df_pref = bgp_attr_df_pref_from_ec(attr, &attr->df_alg);
/* Extract MAC mobility sequence number, if any. */
attr->mm_seqnum = bgp_attr_mac_mobility_seqnum(attr, &sticky);
attr->sticky = sticky;
/* Check if this is a Gateway MAC-IP advertisement */
attr->default_gw = bgp_attr_default_gw(attr);
/* Handle scenario where router flag ecommunity is not
* set but default gw ext community is present.
* Use default gateway, set and propogate R-bit.
*/
if (attr->default_gw)
attr->router_flag = 1;
/* Check EVPN Neighbor advertisement flags, R-bit */
bgp_attr_evpn_na_flag(attr, &attr->router_flag, &proxy);
if (proxy)
attr->es_flags |= ATTR_ES_PROXY_ADVERT;
/* Extract the Rmac, if any */
if (bgp_attr_rmac(attr, &attr->rmac)) {
if (bgp_debug_update(peer, NULL, NULL, 1)
&& bgp_mac_exist(&attr->rmac))
zlog_debug("%s: router mac %pEA is self mac", __func__,
&attr->rmac);
}
/* Get the tunnel type from encap extended community */
bgp_attr_extcom_tunnel_type(attr,
(bgp_encap_types *)&attr->encap_tunneltype);
/* Extract link bandwidth, if any. */
(void)ecommunity_linkbw_present(bgp_attr_get_ecommunity(attr),
&attr->link_bw);
return BGP_ATTR_PARSE_PROCEED;
}
/* IPv6 Extended Community attribute. */
static bgp_attr_parse_ret_t
bgp_attr_ipv6_ext_communities(struct bgp_attr_parser_args *args)
{
struct peer *const peer = args->peer;
struct attr *const attr = args->attr;
const bgp_size_t length = args->length;
struct ecommunity *ipv6_ecomm = NULL;
if (length == 0) {
bgp_attr_set_ipv6_ecommunity(attr, ipv6_ecomm);
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
args->total);
}
ipv6_ecomm = ecommunity_parse_ipv6(
stream_pnt(peer->curr), length,
CHECK_FLAG(peer->flags,
PEER_FLAG_DISABLE_LINK_BW_ENCODING_IEEE));
bgp_attr_set_ipv6_ecommunity(attr, ipv6_ecomm);
/* XXX: fix ecommunity_parse to use stream API */
stream_forward_getp(peer->curr, length);
if (!ipv6_ecomm)
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
args->total);
attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_IPV6_EXT_COMMUNITIES);
return BGP_ATTR_PARSE_PROCEED;
}
/* Parse Tunnel Encap attribute in an UPDATE */
static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */
bgp_size_t length, /* IN: attr's length field */
struct attr *attr, /* IN: caller already allocated */
uint8_t flag, /* IN: attr's flags field */
uint8_t *startp)
{
bgp_size_t total;
uint16_t tunneltype = 0;
total = length + (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3);
if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS)
|| !CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) {
zlog_info(
"Tunnel Encap attribute flag isn't optional and transitive %d",
flag);
bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR,
startp, total);
return -1;
}
if (BGP_ATTR_ENCAP == type) {
/* read outer TLV type and length */
uint16_t tlv_length;
if (length < 4) {
zlog_info(
"Tunnel Encap attribute not long enough to contain outer T,L");
bgp_notify_send_with_data(
peer, BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total);
return -1;
}
tunneltype = stream_getw(BGP_INPUT(peer));
tlv_length = stream_getw(BGP_INPUT(peer));
length -= 4;
if (tlv_length != length) {
zlog_info("%s: tlv_length(%d) != length(%d)",
__func__, tlv_length, length);
}
}
while (length >= 4) {
uint16_t subtype = 0;
uint16_t sublength = 0;
struct bgp_attr_encap_subtlv *tlv;
if (BGP_ATTR_ENCAP == type) {
subtype = stream_getc(BGP_INPUT(peer));
sublength = stream_getc(BGP_INPUT(peer));
length -= 2;
#ifdef ENABLE_BGP_VNC
} else {
subtype = stream_getw(BGP_INPUT(peer));
sublength = stream_getw(BGP_INPUT(peer));
length -= 4;
#endif
}
if (sublength > length) {
zlog_info(
"Tunnel Encap attribute sub-tlv length %d exceeds remaining length %d",
sublength, length);
bgp_notify_send_with_data(
peer, BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total);
return -1;
}
/* alloc and copy sub-tlv */
/* TBD make sure these are freed when attributes are released */
tlv = XCALLOC(MTYPE_ENCAP_TLV,
sizeof(struct bgp_attr_encap_subtlv) + sublength);
tlv->type = subtype;
tlv->length = sublength;
stream_get(tlv->value, peer->curr, sublength);
length -= sublength;
/* attach tlv to encap chain */
if (BGP_ATTR_ENCAP == type) {
struct bgp_attr_encap_subtlv *stlv_last;
for (stlv_last = attr->encap_subtlvs;
stlv_last && stlv_last->next;
stlv_last = stlv_last->next)
;
if (stlv_last) {
stlv_last->next = tlv;
} else {
attr->encap_subtlvs = tlv;
}
#ifdef ENABLE_BGP_VNC
} else {
struct bgp_attr_encap_subtlv *stlv_last;
struct bgp_attr_encap_subtlv *vnc_subtlvs =
bgp_attr_get_vnc_subtlvs(attr);
for (stlv_last = vnc_subtlvs;
stlv_last && stlv_last->next;
stlv_last = stlv_last->next)
;
if (stlv_last)
stlv_last->next = tlv;
else
bgp_attr_set_vnc_subtlvs(attr, tlv);
#endif
}
}
if (BGP_ATTR_ENCAP == type) {
attr->encap_tunneltype = tunneltype;
}
if (length) {
/* spurious leftover data */
zlog_info(
"Tunnel Encap attribute length is bad: %d leftover octets",
length);
bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
startp, total);
return -1;
}
return 0;
}
/* SRv6 Service Data Sub-Sub-TLV attribute
* draft-ietf-bess-srv6-services-07
*/
static bgp_attr_parse_ret_t
bgp_attr_srv6_service_data(struct bgp_attr_parser_args *args)
{
struct peer *const peer = args->peer;
struct attr *const attr = args->attr;
uint8_t type, loc_block_len, loc_node_len, func_len, arg_len,
transposition_len, transposition_offset;
uint16_t length;
size_t headersz = sizeof(type) + sizeof(length);
if (STREAM_READABLE(peer->curr) < headersz) {
flog_err(
EC_BGP_ATTR_LEN,
"Malformed SRv6 Service Data Sub-Sub-TLV attribute - insufficent data (need %zu for attribute header, have %zu remaining in UPDATE)",
headersz, STREAM_READABLE(peer->curr));
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
type = stream_getc(peer->curr);
length = stream_getw(peer->curr);
if (STREAM_READABLE(peer->curr) < length) {
flog_err(
EC_BGP_ATTR_LEN,
"Malformed SRv6 Service Data Sub-Sub-TLV attribute - insufficent data (need %hu for attribute data, have %zu remaining in UPDATE)",
length, STREAM_READABLE(peer->curr));
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
if (type == BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE) {
loc_block_len = stream_getc(peer->curr);
loc_node_len = stream_getc(peer->curr);
func_len = stream_getc(peer->curr);
arg_len = stream_getc(peer->curr);
transposition_len = stream_getc(peer->curr);
transposition_offset = stream_getc(peer->curr);
/* Log SRv6 Service Data Sub-Sub-TLV */
if (BGP_DEBUG(vpn, VPN_LEAK_LABEL)) {
zlog_debug(
"%s: srv6-l3-srv-data loc-block-len=%u, loc-node-len=%u func-len=%u, arg-len=%u, transposition-len=%u, transposition-offset=%u",
__func__, loc_block_len, loc_node_len, func_len,
arg_len, transposition_len,
transposition_offset);
}
attr->srv6_l3vpn->loc_block_len = loc_block_len;
attr->srv6_l3vpn->loc_node_len = loc_node_len;
attr->srv6_l3vpn->func_len = func_len;
attr->srv6_l3vpn->arg_len = arg_len;
attr->srv6_l3vpn->transposition_len = transposition_len;
attr->srv6_l3vpn->transposition_offset = transposition_offset;
}
else {
if (bgp_debug_update(peer, NULL, NULL, 1))
zlog_debug(
"%s attr SRv6 Service Data Sub-Sub-TLV sub-sub-type=%u is not supported, skipped",
peer->host, type);
stream_forward_getp(peer->curr, length);
}
return BGP_ATTR_PARSE_PROCEED;
}
/* SRv6 Service Sub-TLV attribute
* draft-ietf-bess-srv6-services-07
*/
static bgp_attr_parse_ret_t
bgp_attr_srv6_service(struct bgp_attr_parser_args *args)
{
struct peer *const peer = args->peer;
struct attr *const attr = args->attr;
struct in6_addr ipv6_sid;
uint8_t type, sid_flags;
uint16_t length, endpoint_behavior;
size_t headersz = sizeof(type) + sizeof(length);
bgp_attr_parse_ret_t err;
char buf[BUFSIZ];
if (STREAM_READABLE(peer->curr) < headersz) {
flog_err(
EC_BGP_ATTR_LEN,
"Malformed SRv6 Service Sub-TLV attribute - insufficent data (need %zu for attribute header, have %zu remaining in UPDATE)",
headersz, STREAM_READABLE(peer->curr));
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
type = stream_getc(peer->curr);
length = stream_getw(peer->curr);
if (STREAM_READABLE(peer->curr) < length) {
flog_err(
EC_BGP_ATTR_LEN,
"Malformed SRv6 Service Sub-TLV attribute - insufficent data (need %hu for attribute data, have %zu remaining in UPDATE)",
length, STREAM_READABLE(peer->curr));
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
if (type == BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO) {
stream_getc(peer->curr);
stream_get(&ipv6_sid, peer->curr, sizeof(ipv6_sid));
sid_flags = stream_getc(peer->curr);
endpoint_behavior = stream_getw(peer->curr);
stream_getc(peer->curr);
/* Log SRv6 Service Sub-TLV */
if (BGP_DEBUG(vpn, VPN_LEAK_LABEL)) {
inet_ntop(AF_INET6, &ipv6_sid, buf, sizeof(buf));
zlog_debug(
"%s: srv6-l3-srv sid %s, sid-flags 0x%02x, end-behaviour 0x%04x",
__func__, buf, sid_flags, endpoint_behavior);
}
/* Configure from Info */
if (attr->srv6_l3vpn) {
flog_err(EC_BGP_ATTRIBUTE_REPEATED,
"Prefix SID SRv6 L3VPN field repeated");
return bgp_attr_malformed(
args, BGP_NOTIFY_UPDATE_MAL_ATTR, args->total);
}
attr->srv6_l3vpn = XCALLOC(MTYPE_BGP_SRV6_L3VPN,
sizeof(struct bgp_attr_srv6_l3vpn));
sid_copy(&attr->srv6_l3vpn->sid, &ipv6_sid);
attr->srv6_l3vpn->sid_flags = sid_flags;
attr->srv6_l3vpn->endpoint_behavior = endpoint_behavior;
attr->srv6_l3vpn->loc_block_len = 0;
attr->srv6_l3vpn->loc_node_len = 0;
attr->srv6_l3vpn->func_len = 0;
attr->srv6_l3vpn->arg_len = 0;
attr->srv6_l3vpn->transposition_len = 0;
attr->srv6_l3vpn->transposition_offset = 0;
// Sub-Sub-TLV found
if (length > BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO_LENGTH) {
err = bgp_attr_srv6_service_data(args);
if (err != BGP_ATTR_PARSE_PROCEED)
return err;
}
attr->srv6_l3vpn = srv6_l3vpn_intern(attr->srv6_l3vpn);
}
/* Placeholder code for unsupported type */
else {
if (bgp_debug_update(peer, NULL, NULL, 1))
zlog_debug(
"%s attr SRv6 Service Sub-TLV sub-type=%u is not supported, skipped",
peer->host, type);
stream_forward_getp(peer->curr, length);
}
return BGP_ATTR_PARSE_PROCEED;
}
/*
* Read an individual SID value returning how much data we have read
* Returns 0 if there was an error that needs to be passed up the stack
*/
static bgp_attr_parse_ret_t bgp_attr_psid_sub(uint8_t type, uint16_t length,
struct bgp_attr_parser_args *args)
{
struct peer *const peer = args->peer;
struct attr *const attr = args->attr;
uint32_t label_index;
struct in6_addr ipv6_sid;
uint32_t srgb_base;
uint32_t srgb_range;
int srgb_count;
uint8_t sid_type, sid_flags;
char buf[BUFSIZ];
if (type == BGP_PREFIX_SID_LABEL_INDEX) {
if (STREAM_READABLE(peer->curr) < length
|| length != BGP_PREFIX_SID_LABEL_INDEX_LENGTH) {
flog_err(EC_BGP_ATTR_LEN,
"Prefix SID label index length is %hu instead of %u",
length, BGP_PREFIX_SID_LABEL_INDEX_LENGTH);
return bgp_attr_malformed(args,
BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
/* Ignore flags and reserved */
stream_getc(peer->curr);
stream_getw(peer->curr);
/* Fetch the label index and see if it is valid. */
label_index = stream_getl(peer->curr);
if (label_index == BGP_INVALID_LABEL_INDEX)
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
args->total);
/* Store label index; subsequently, we'll check on
* address-family */
attr->label_index = label_index;
}
/* Placeholder code for the IPv6 SID type */
else if (type == BGP_PREFIX_SID_IPV6) {
if (STREAM_READABLE(peer->curr) < length
|| length != BGP_PREFIX_SID_IPV6_LENGTH) {
flog_err(EC_BGP_ATTR_LEN,
"Prefix SID IPv6 length is %hu instead of %u",
length, BGP_PREFIX_SID_IPV6_LENGTH);
return bgp_attr_malformed(args,
BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
/* Ignore reserved */
stream_getc(peer->curr);
stream_getw(peer->curr);
stream_get(&ipv6_sid, peer->curr, 16);
}
/* Placeholder code for the Originator SRGB type */
else if (type == BGP_PREFIX_SID_ORIGINATOR_SRGB) {
/*
* ietf-idr-bgp-prefix-sid-05:
* Length is the total length of the value portion of the
* TLV: 2 + multiple of 6.
*
* peer->curr stream readp should be at the beginning of the 16
* bit flag field at this point in the code.
*/
/*
* Check that the TLV length field is sane: at least 2 bytes of
* flag, and at least 1 SRGB (these are 6 bytes each)
*/
if (length < (2 + BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH)) {
flog_err(
EC_BGP_ATTR_LEN,
"Prefix SID Originator SRGB length field claims length of %hu bytes, but the minimum for this TLV type is %u",
length,
2 + BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH);
return bgp_attr_malformed(
args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
/*
* Check that we actually have at least as much data as
* specified by the length field
*/
if (STREAM_READABLE(peer->curr) < length) {
flog_err(EC_BGP_ATTR_LEN,
"Prefix SID Originator SRGB specifies length %hu, but only %zu bytes remain",
length, STREAM_READABLE(peer->curr));
return bgp_attr_malformed(
args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
/*
* Check that the portion of the TLV containing the sequence of
* SRGBs corresponds to a multiple of the SRGB size; to get
* that length, we skip the 16 bit flags field
*/
stream_getw(peer->curr);
length -= 2;
if (length % BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH) {
flog_err(
EC_BGP_ATTR_LEN,
"Prefix SID Originator SRGB length field claims attribute SRGB sequence section is %hubytes, but it must be a multiple of %u",
length, BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH);
return bgp_attr_malformed(
args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
srgb_count = length / BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH;
for (int i = 0; i < srgb_count; i++) {
stream_get(&srgb_base, peer->curr, 3);
stream_get(&srgb_range, peer->curr, 3);
}
}
/* Placeholder code for the VPN-SID Service type */
else if (type == BGP_PREFIX_SID_VPN_SID) {
if (STREAM_READABLE(peer->curr) < length
|| length != BGP_PREFIX_SID_VPN_SID_LENGTH) {
flog_err(EC_BGP_ATTR_LEN,
"Prefix SID VPN SID length is %hu instead of %u",
length, BGP_PREFIX_SID_VPN_SID_LENGTH);
return bgp_attr_malformed(args,
BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
/* Parse VPN-SID Sub-TLV */
stream_getc(peer->curr); /* reserved */
sid_type = stream_getc(peer->curr); /* sid_type */
sid_flags = stream_getc(peer->curr); /* sid_flags */
stream_get(&ipv6_sid, peer->curr,
sizeof(ipv6_sid)); /* sid_value */
/* Log VPN-SID Sub-TLV */
if (BGP_DEBUG(vpn, VPN_LEAK_LABEL)) {
inet_ntop(AF_INET6, &ipv6_sid, buf, sizeof(buf));
zlog_debug(
"%s: vpn-sid: sid %s, sid-type 0x%02x sid-flags 0x%02x",
__func__, buf, sid_type, sid_flags);
}
/* Configure from Info */
if (attr->srv6_vpn) {
flog_err(EC_BGP_ATTRIBUTE_REPEATED,
"Prefix SID SRv6 VPN field repeated");
return bgp_attr_malformed(
args, BGP_NOTIFY_UPDATE_MAL_ATTR, args->total);
}
attr->srv6_vpn = XCALLOC(MTYPE_BGP_SRV6_VPN,
sizeof(struct bgp_attr_srv6_vpn));
attr->srv6_vpn->sid_flags = sid_flags;
sid_copy(&attr->srv6_vpn->sid, &ipv6_sid);
attr->srv6_vpn = srv6_vpn_intern(attr->srv6_vpn);
}
/* Placeholder code for the SRv6 L3 Service type */
else if (type == BGP_PREFIX_SID_SRV6_L3_SERVICE) {
if (STREAM_READABLE(peer->curr) < length) {
flog_err(
EC_BGP_ATTR_LEN,
"Prefix SID SRv6 L3-Service length is %hu, but only %zu bytes remain",
length, STREAM_READABLE(peer->curr));
return bgp_attr_malformed(args,
BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
/* ignore reserved */
stream_getc(peer->curr);
return bgp_attr_srv6_service(args);
}
/* Placeholder code for Unsupported TLV */
else {
if (STREAM_READABLE(peer->curr) < length) {
flog_err(
EC_BGP_ATTR_LEN,
"Prefix SID SRv6 length is %hu - too long, only %zu remaining in this UPDATE",
length, STREAM_READABLE(peer->curr));
return bgp_attr_malformed(
args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
if (bgp_debug_update(peer, NULL, NULL, 1))
zlog_debug(
"%s attr Prefix-SID sub-type=%u is not supported, skipped",
peer->host, type);
stream_forward_getp(peer->curr, length);
}
return BGP_ATTR_PARSE_PROCEED;
}
/* Prefix SID attribute
* draft-ietf-idr-bgp-prefix-sid-05
*/
bgp_attr_parse_ret_t bgp_attr_prefix_sid(struct bgp_attr_parser_args *args)
{
struct peer *const peer = args->peer;
struct attr *const attr = args->attr;
bgp_attr_parse_ret_t ret;
attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID);
uint8_t type;
uint16_t length;
size_t headersz = sizeof(type) + sizeof(length);
size_t psid_parsed_length = 0;
while (STREAM_READABLE(peer->curr) > 0
&& psid_parsed_length < args->length) {
if (STREAM_READABLE(peer->curr) < headersz) {
flog_err(
EC_BGP_ATTR_LEN,
"Malformed Prefix SID attribute - insufficent data (need %zu for attribute header, have %zu remaining in UPDATE)",
headersz, STREAM_READABLE(peer->curr));
return bgp_attr_malformed(
args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
type = stream_getc(peer->curr);
length = stream_getw(peer->curr);
if (STREAM_READABLE(peer->curr) < length) {
flog_err(
EC_BGP_ATTR_LEN,
"Malformed Prefix SID attribute - insufficient data (need %hu for attribute body, have %zu remaining in UPDATE)",
length, STREAM_READABLE(peer->curr));
return bgp_attr_malformed(args,
BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
ret = bgp_attr_psid_sub(type, length, args);
if (ret != BGP_ATTR_PARSE_PROCEED)
return ret;
psid_parsed_length += length + headersz;
if (psid_parsed_length > args->length) {
flog_err(
EC_BGP_ATTR_LEN,
"Malformed Prefix SID attribute - TLV overflow by attribute (need %zu for TLV length, have %zu overflowed in UPDATE)",
length + headersz, psid_parsed_length - (length + headersz));
return bgp_attr_malformed(
args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
}
return BGP_ATTR_PARSE_PROCEED;
}
/* PMSI tunnel attribute (RFC 6514)
* Basic validation checks done here.
*/
static bgp_attr_parse_ret_t
bgp_attr_pmsi_tunnel(struct bgp_attr_parser_args *args)
{
struct peer *const peer = args->peer;
struct attr *const attr = args->attr;
const bgp_size_t length = args->length;
uint8_t tnl_type;
int attr_parse_len = 2 + BGP_LABEL_BYTES;
/* Verify that the receiver is expecting "ingress replication" as we
* can only support that.
*/
if (length < attr_parse_len) {
flog_err(EC_BGP_ATTR_LEN, "Bad PMSI tunnel attribute length %d",
length);
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
stream_getc(peer->curr); /* Flags */
tnl_type = stream_getc(peer->curr);
if (tnl_type > PMSI_TNLTYPE_MAX) {
flog_err(EC_BGP_ATTR_PMSI_TYPE,
"Invalid PMSI tunnel attribute type %d", tnl_type);
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
args->total);
}
if (tnl_type == PMSI_TNLTYPE_INGR_REPL) {
if (length != 9) {
flog_err(EC_BGP_ATTR_PMSI_LEN,
"Bad PMSI tunnel attribute length %d for IR",
length);
return bgp_attr_malformed(
args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
args->total);
}
}
attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL);
bgp_attr_set_pmsi_tnl_type(attr, tnl_type);
stream_get(&attr->label, peer->curr, BGP_LABEL_BYTES);
/* Forward read pointer of input stream. */
stream_forward_getp(peer->curr, length - attr_parse_len);
return BGP_ATTR_PARSE_PROCEED;
}
/* BGP unknown attribute treatment. */
static bgp_attr_parse_ret_t bgp_attr_unknown(struct bgp_attr_parser_args *args)
{
bgp_size_t total = args->total;
struct transit *transit;
struct peer *const peer = args->peer;
struct attr *const attr = args->attr;
uint8_t *const startp = args->startp;
const uint8_t type = args->type;
const uint8_t flag = args->flags;
const bgp_size_t length = args->length;
if (bgp_debug_update(peer, NULL, NULL, 1))
zlog_debug(
"%s Unknown attribute is received (type %d, length %d)",
peer->host, type, length);
/* Forward read pointer of input stream. */
stream_forward_getp(peer->curr, length);
/* 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)) {
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_UNREC_ATTR,
args->total);
}
/* 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 BGP_ATTR_PARSE_PROCEED;
/* 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. */
transit = bgp_attr_get_transit(attr);
if (!transit)
transit = XCALLOC(MTYPE_TRANSIT, sizeof(struct transit));
transit->val = XREALLOC(MTYPE_TRANSIT_VAL, transit->val,
transit->length + total);
memcpy(transit->val + transit->length, startp, total);
transit->length += total;
bgp_attr_set_transit(attr, transit);
return BGP_ATTR_PARSE_PROCEED;
}
/* Well-known attribute check. */
static int bgp_attr_check(struct peer *peer, struct attr *attr)
{
uint8_t type = 0;
/* BGP Graceful-Restart End-of-RIB for IPv4 unicast is signaled as an
* empty UPDATE. */
if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_RCV) && !attr->flag)
return BGP_ATTR_PARSE_PROCEED;
/* "An UPDATE message that contains the MP_UNREACH_NLRI is not required
to carry any other path attributes.", though if MP_REACH_NLRI or NLRI
are present, it should. Check for any other attribute being present
instead.
*/
if ((!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI)) &&
CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_UNREACH_NLRI))))
return BGP_ATTR_PARSE_PROCEED;
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;
/* RFC 2858 makes Next-Hop optional/ignored, if MP_REACH_NLRI is present
* and
* NLRI is empty. We can't easily check NLRI empty here though.
*/
if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP))
&& !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI)))
type = BGP_ATTR_NEXT_HOP;
if (peer->sort == BGP_PEER_IBGP
&& !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF)))
type = BGP_ATTR_LOCAL_PREF;
/* If any of the well-known mandatory attributes are not present
* in an UPDATE message, then "treat-as-withdraw" MUST be used.
*/
if (type) {
flog_warn(EC_BGP_MISSING_ATTRIBUTE,
"%s Missing well-known attribute %s.", peer->host,
lookup_msg(attr_str, type, NULL));
return BGP_ATTR_PARSE_WITHDRAW;
}
return BGP_ATTR_PARSE_PROCEED;
}
/* Read attribute of update packet. This function is called from
bgp_update_receive() in bgp_packet.c. */
bgp_attr_parse_ret_t bgp_attr_parse(struct peer *peer, struct attr *attr,
bgp_size_t size, struct bgp_nlri *mp_update,
struct bgp_nlri *mp_withdraw)
{
bgp_attr_parse_ret_t ret;
uint8_t flag = 0;
uint8_t type = 0;
bgp_size_t length;
uint8_t *startp, *endp;
uint8_t *attr_endp;
uint8_t 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 = {.s_addr = 0};
struct transit *transit;
/* 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) */
flog_warn(
EC_BGP_ATTRIBUTE_TOO_SMALL,
"%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);
ret = BGP_ATTR_PARSE_ERROR;
goto done;
}
/* 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))) {
flog_warn(
EC_BGP_EXT_ATTRIBUTE_TOO_SMALL,
"%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);
ret = BGP_ATTR_PARSE_ERROR;
goto done;
}
/* 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)) {
flog_warn(
EC_BGP_ATTRIBUTE_REPEATED,
"%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);
ret = BGP_ATTR_PARSE_ERROR;
goto done;
}
/* 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) {
flog_warn(
EC_BGP_ATTRIBUTE_TOO_LARGE,
"%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);
/*
* RFC 4271 6.3
* If any recognized attribute has an Attribute
* Length that conflicts with the expected length
* (based on the attribute type code), then the
* Error Subcode MUST be set to Attribute Length
* Error. The Data field MUST contain the erroneous
* attribute (type, length, and value).
* ----------
* We do not currently have a good way to determine the
* length of the attribute independent of the length
* received in the message. Instead we send the
* minimum between the amount of data we have and the
* amount specified by the attribute length field.
*
* Instead of directly passing in the packet buffer and
* offset we use the stream_get* functions to read into
* a stack buffer, since they perform bounds checking
* and we are working with untrusted data.
*/
unsigned char ndata[peer->max_packet_size];
memset(ndata, 0x00, sizeof(ndata));
size_t lfl =
CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 2 : 1;
/* Rewind to end of flag field */
stream_rewind_getp(BGP_INPUT(peer), (1 + lfl));
/* Type */
stream_get(&ndata[0], BGP_INPUT(peer), 1);
/* Length */
stream_get(&ndata[1], BGP_INPUT(peer), lfl);
/* Value */
size_t atl = attr_endp - startp;
size_t ndl = MIN(atl, STREAM_READABLE(BGP_INPUT(peer)));
stream_get(&ndata[lfl + 1], BGP_INPUT(peer), ndl);
bgp_notify_send_with_data(
peer, BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_ATTR_LENG_ERR, ndata,
ndl + lfl + 1);
ret = BGP_ATTR_PARSE_ERROR;
goto done;
}
struct bgp_attr_parser_args attr_args = {
.peer = peer,
.length = length,
.attr = attr,
.type = type,
.flags = flag,
.startp = startp,
.total = attr_endp - startp,
};
/* 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 (bgp_attr_flag_invalid(&attr_args)) {
ret = bgp_attr_malformed(
&attr_args, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR,
attr_args.total);
if (ret == BGP_ATTR_PARSE_PROCEED)
continue;
goto done;
}
/* OK check attribute and store it's value. */
switch (type) {
case BGP_ATTR_ORIGIN:
ret = bgp_attr_origin(&attr_args);
break;
case BGP_ATTR_AS_PATH:
ret = bgp_attr_aspath(&attr_args);
break;
case BGP_ATTR_AS4_PATH:
ret = bgp_attr_as4_path(&attr_args, &as4_path);
break;
case BGP_ATTR_NEXT_HOP:
ret = bgp_attr_nexthop(&attr_args);
break;
case BGP_ATTR_MULTI_EXIT_DISC:
ret = bgp_attr_med(&attr_args);
break;
case BGP_ATTR_LOCAL_PREF:
ret = bgp_attr_local_pref(&attr_args);
break;
case BGP_ATTR_ATOMIC_AGGREGATE:
ret = bgp_attr_atomic(&attr_args);
break;
case BGP_ATTR_AGGREGATOR:
ret = bgp_attr_aggregator(&attr_args);
break;
case BGP_ATTR_AS4_AGGREGATOR:
ret = bgp_attr_as4_aggregator(&attr_args,
&as4_aggregator,
&as4_aggregator_addr);
break;
case BGP_ATTR_COMMUNITIES:
ret = bgp_attr_community(&attr_args);
break;
case BGP_ATTR_LARGE_COMMUNITIES:
ret = bgp_attr_large_community(&attr_args);
break;
case BGP_ATTR_ORIGINATOR_ID:
ret = bgp_attr_originator_id(&attr_args);
break;
case BGP_ATTR_CLUSTER_LIST:
ret = bgp_attr_cluster_list(&attr_args);
break;
case BGP_ATTR_MP_REACH_NLRI:
ret = bgp_mp_reach_parse(&attr_args, mp_update);
break;
case BGP_ATTR_MP_UNREACH_NLRI:
ret = bgp_mp_unreach_parse(&attr_args, mp_withdraw);
break;
case BGP_ATTR_EXT_COMMUNITIES:
ret = bgp_attr_ext_communities(&attr_args);
break;
#ifdef ENABLE_BGP_VNC_ATTR
case BGP_ATTR_VNC:
#endif
case BGP_ATTR_ENCAP:
ret = bgp_attr_encap(type, peer, length, attr, flag,
startp);
break;
case BGP_ATTR_PREFIX_SID:
ret = bgp_attr_prefix_sid(&attr_args);
break;
case BGP_ATTR_PMSI_TUNNEL:
ret = bgp_attr_pmsi_tunnel(&attr_args);
break;
case BGP_ATTR_IPV6_EXT_COMMUNITIES:
ret = bgp_attr_ipv6_ext_communities(&attr_args);
break;
default:
ret = bgp_attr_unknown(&attr_args);
break;
}
if (ret == BGP_ATTR_PARSE_ERROR_NOTIFYPLS) {
bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_MAL_ATTR);
ret = BGP_ATTR_PARSE_ERROR;
goto done;
}
if (ret == BGP_ATTR_PARSE_EOR) {
goto done;
}
if (ret == BGP_ATTR_PARSE_ERROR) {
flog_warn(EC_BGP_ATTRIBUTE_PARSE_ERROR,
"%s: Attribute %s, parse error", peer->host,
lookup_msg(attr_str, type, NULL));
goto done;
}
if (ret == BGP_ATTR_PARSE_WITHDRAW) {
flog_warn(
EC_BGP_ATTRIBUTE_PARSE_WITHDRAW,
"%s: Attribute %s, parse error - treating as withdrawal",
peer->host, lookup_msg(attr_str, type, NULL));
goto done;
}
/* Check the fetched length. */
if (BGP_INPUT_PNT(peer) != attr_endp) {
flog_warn(EC_BGP_ATTRIBUTE_FETCH_ERROR,
"%s: BGP attribute %s, fetch error",
peer->host, lookup_msg(attr_str, type, NULL));
bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_ATTR_LENG_ERR);
ret = BGP_ATTR_PARSE_ERROR;
goto done;
}
}
/*
* draft-ietf-idr-bgp-prefix-sid-27#section-3:
* About Prefix-SID path attribute,
* Label-Index TLV(type1) and The Originator SRGB TLV(type-3)
* may only appear in a BGP Prefix-SID attribute attached to
* IPv4/IPv6 Labeled Unicast prefixes ([RFC8277]).
* It MUST be ignored when received for other BGP AFI/SAFI combinations.
*/
if (!attr->mp_nexthop_len || mp_update->safi != SAFI_LABELED_UNICAST)
attr->label_index = BGP_INVALID_LABEL_INDEX;
/* Check final read pointer is same as end pointer. */
if (BGP_INPUT_PNT(peer) != endp) {
flog_warn(EC_BGP_ATTRIBUTES_MISMATCH,
"%s: BGP attribute %s, length mismatch", peer->host,
lookup_msg(attr_str, type, NULL));
bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_ATTR_LENG_ERR);
ret = BGP_ATTR_PARSE_ERROR;
goto done;
}
/*
* RFC4271: If the NEXT_HOP attribute field is syntactically incorrect,
* then the Error Subcode MUST be set to Invalid NEXT_HOP Attribute.
* This is implemented below and will result in a NOTIFICATION. If the
* NEXT_HOP attribute is semantically incorrect, the error SHOULD be
* logged, and the route SHOULD be ignored. In this case, a NOTIFICATION
* message SHOULD NOT be sent. This is implemented elsewhere.
*
* RFC4760: An UPDATE message that carries no NLRI, other than the one
* encoded in the MP_REACH_NLRI attribute, SHOULD NOT carry the NEXT_HOP
* attribute. If such a message contains the NEXT_HOP attribute, the BGP
* speaker that receives the message SHOULD ignore this attribute.
*/
if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP))
&& !CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_MP_REACH_NLRI))) {
if (bgp_attr_nexthop_valid(peer, attr) < 0) {
ret = BGP_ATTR_PARSE_ERROR;
goto done;
}
}
/* Check all mandatory well-known attributes are present */
ret = bgp_attr_check(peer, attr);
if (ret < 0)
goto done;
/*
* 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.
*
* It is possible to not have AS_PATH, e.g. GR EoR and sole
* MP_UNREACH_NLRI.
*/
/* actually... this doesn't ever return failure currently, but
* better safe than sorry */
if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_AS_PATH))
&& bgp_attr_munge_as4_attrs(peer, attr, as4_path, as4_aggregator,
&as4_aggregator_addr)) {
bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR,
BGP_NOTIFY_UPDATE_MAL_ATTR);
ret = BGP_ATTR_PARSE_ERROR;
goto done;
}
/*
* 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 != BGP_ATTR_PARSE_PROCEED)
goto done;
}
ret = BGP_ATTR_PARSE_PROCEED;
done:
/*
* 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
*/
/*
* unintern - it is in the hash
* The flag that we got this is still there, but that
* does not do any trouble
*/
aspath_unintern(&as4_path);
transit = bgp_attr_get_transit(attr);
if (ret != BGP_ATTR_PARSE_ERROR) {
/* Finally intern unknown attribute. */
if (transit)
bgp_attr_set_transit(attr, transit_intern(transit));
if (attr->encap_subtlvs)
attr->encap_subtlvs = encap_intern(attr->encap_subtlvs,
ENCAP_SUBTLV_TYPE);
#ifdef ENABLE_BGP_VNC
struct bgp_attr_encap_subtlv *vnc_subtlvs =
bgp_attr_get_vnc_subtlvs(attr);
if (vnc_subtlvs)
bgp_attr_set_vnc_subtlvs(
attr,
encap_intern(vnc_subtlvs, VNC_SUBTLV_TYPE));
#endif
} else {
if (transit) {
transit_free(transit);
bgp_attr_set_transit(attr, NULL);
}
bgp_attr_flush_encap(attr);
};
/* Sanity checks */
transit = bgp_attr_get_transit(attr);
if (transit)
assert(transit->refcnt > 0);
if (attr->encap_subtlvs)
assert(attr->encap_subtlvs->refcnt > 0);
#ifdef ENABLE_BGP_VNC
struct bgp_attr_encap_subtlv *vnc_subtlvs =
bgp_attr_get_vnc_subtlvs(attr);
if (vnc_subtlvs)
assert(vnc_subtlvs->refcnt > 0);
#endif
return ret;
}
/*
* Extract the tunnel type from extended community
*/
void bgp_attr_extcom_tunnel_type(struct attr *attr,
bgp_encap_types *tunnel_type)
{
struct ecommunity *ecom;
uint32_t i;
if (!attr)
return;
ecom = bgp_attr_get_ecommunity(attr);
if (!ecom || !ecom->size)
return;
for (i = 0; i < ecom->size; i++) {
uint8_t *pnt;
uint8_t type, sub_type;
pnt = (ecom->val + (i * ECOMMUNITY_SIZE));
type = pnt[0];
sub_type = pnt[1];
if (!(type == ECOMMUNITY_ENCODE_OPAQUE &&
sub_type == ECOMMUNITY_OPAQUE_SUBTYPE_ENCAP))
continue;
*tunnel_type = ((pnt[6] << 8) | pnt[7]);
return;
}
return;
}
size_t bgp_packet_mpattr_start(struct stream *s, struct peer *peer, afi_t afi,
safi_t safi, struct bpacket_attr_vec_arr *vecarr,
struct attr *attr)
{
size_t sizep;
iana_afi_t pkt_afi;
iana_safi_t pkt_safi;
afi_t nh_afi;
/* Set extended bit always to encode the attribute length as 2 bytes */
stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN);
stream_putc(s, BGP_ATTR_MP_REACH_NLRI);
sizep = stream_get_endp(s);
stream_putw(s, 0); /* Marker: Attribute length. */
/* Convert AFI, SAFI to values for packet. */
bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi);
stream_putw(s, pkt_afi); /* AFI */
stream_putc(s, pkt_safi); /* SAFI */
/* Nexthop AFI */
if (afi == AFI_IP
&& (safi == SAFI_UNICAST || safi == SAFI_LABELED_UNICAST
|| safi == SAFI_MPLS_VPN || safi == SAFI_MULTICAST))
nh_afi = peer_cap_enhe(peer, afi, safi) ? AFI_IP6 : AFI_IP;
else if (safi == SAFI_FLOWSPEC)
nh_afi = afi;
else
nh_afi = BGP_NEXTHOP_AFI_FROM_NHLEN(attr->mp_nexthop_len);
/* Nexthop */
bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s, attr);
switch (nh_afi) {
case AFI_IP:
switch (safi) {
case SAFI_UNICAST:
case SAFI_MULTICAST:
case SAFI_LABELED_UNICAST:
stream_putc(s, 4);
stream_put_ipv4(s, attr->nexthop.s_addr);
break;
case SAFI_MPLS_VPN:
stream_putc(s, 12);
stream_putl(s, 0); /* RD = 0, per RFC */
stream_putl(s, 0);
stream_put(s, &attr->mp_nexthop_global_in, 4);
break;
case SAFI_ENCAP:
case SAFI_EVPN:
stream_putc(s, 4);
stream_put(s, &attr->mp_nexthop_global_in, 4);
break;
case SAFI_FLOWSPEC:
if (attr->mp_nexthop_len == 0)
stream_putc(s, 0); /* no nexthop for flowspec */
else {
stream_putc(s, attr->mp_nexthop_len);
stream_put_ipv4(s, attr->nexthop.s_addr);
}
default:
break;
}
break;
case AFI_IP6:
switch (safi) {
case SAFI_UNICAST:
case SAFI_MULTICAST:
case SAFI_LABELED_UNICAST:
case SAFI_EVPN: {
if (attr->mp_nexthop_len
== BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) {
stream_putc(s,
BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL);
stream_put(s, &attr->mp_nexthop_global,
IPV6_MAX_BYTELEN);
stream_put(s, &attr->mp_nexthop_local,
IPV6_MAX_BYTELEN);
} else {
stream_putc(s, IPV6_MAX_BYTELEN);
stream_put(s, &attr->mp_nexthop_global,
IPV6_MAX_BYTELEN);
}
} break;
case SAFI_MPLS_VPN: {
if (attr->mp_nexthop_len
== BGP_ATTR_NHLEN_IPV6_GLOBAL) {
stream_putc(s, 24);
stream_putl(s, 0); /* RD = 0, per RFC */
stream_putl(s, 0);
stream_put(s, &attr->mp_nexthop_global,
IPV6_MAX_BYTELEN);
} else if (attr->mp_nexthop_len
== BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL) {
stream_putc(s, 48);
stream_putl(s, 0); /* RD = 0, per RFC */
stream_putl(s, 0);
stream_put(s, &attr->mp_nexthop_global,
IPV6_MAX_BYTELEN);
stream_putl(s, 0); /* RD = 0, per RFC */
stream_putl(s, 0);
stream_put(s, &attr->mp_nexthop_local,
IPV6_MAX_BYTELEN);
}
} break;
case SAFI_ENCAP:
stream_putc(s, IPV6_MAX_BYTELEN);
stream_put(s, &attr->mp_nexthop_global,
IPV6_MAX_BYTELEN);
break;
case SAFI_FLOWSPEC:
stream_putc(s, 0); /* no nexthop for flowspec */
default:
break;
}
break;
default:
if (safi != SAFI_FLOWSPEC)
flog_err(
EC_BGP_ATTR_NH_SEND_LEN,
"Bad nexthop when sending to %s, AFI %u SAFI %u nhlen %d",
peer->host, afi, safi, attr->mp_nexthop_len);
break;
}
/* SNPA */
stream_putc(s, 0);
return sizep;
}
void bgp_packet_mpattr_prefix(struct stream *s, afi_t afi, safi_t safi,
const struct prefix *p,
const struct prefix_rd *prd, mpls_label_t *label,
uint32_t num_labels, bool addpath_capable,
uint32_t addpath_tx_id, struct attr *attr)
{
if (safi == SAFI_MPLS_VPN) {
if (addpath_capable)
stream_putl(s, addpath_tx_id);
/* Label, RD, Prefix write. */
stream_putc(s, p->prefixlen + 88);
stream_put(s, label, BGP_LABEL_BYTES);
stream_put(s, prd->val, 8);
stream_put(s, &p->u.prefix, PSIZE(p->prefixlen));
} else if (afi == AFI_L2VPN && safi == SAFI_EVPN) {
/* EVPN prefix - contents depend on type */
bgp_evpn_encode_prefix(s, p, prd, label, num_labels, attr,
addpath_capable, addpath_tx_id);
} else if (safi == SAFI_LABELED_UNICAST) {
/* Prefix write with label. */
stream_put_labeled_prefix(s, p, label, addpath_capable,
addpath_tx_id);
} else if (safi == SAFI_FLOWSPEC) {
stream_putc(s, p->u.prefix_flowspec.prefixlen);
stream_put(s, (const void *)p->u.prefix_flowspec.ptr,
p->u.prefix_flowspec.prefixlen);
} else
stream_put_prefix_addpath(s, p, addpath_capable, addpath_tx_id);
}
size_t bgp_packet_mpattr_prefix_size(afi_t afi, safi_t safi,
const struct prefix *p)
{
int size = PSIZE(p->prefixlen);
if (safi == SAFI_MPLS_VPN)
size += 88;
else if (safi == SAFI_LABELED_UNICAST)
size += BGP_LABEL_BYTES;
else if (afi == AFI_L2VPN && safi == SAFI_EVPN)
size += 232; // TODO: Maximum possible for type-2, type-3 and
// type-5
return size;
}
/*
* Encodes the tunnel encapsulation attribute,
* and with ENABLE_BGP_VNC the VNC attribute which uses
* almost the same TLV format
*/
static void bgp_packet_mpattr_tea(struct bgp *bgp, struct peer *peer,
struct stream *s, struct attr *attr,
uint8_t attrtype)
{
unsigned int attrlenfield = 0;
unsigned int attrhdrlen = 0;
struct bgp_attr_encap_subtlv *subtlvs;
struct bgp_attr_encap_subtlv *st;
const char *attrname;
if (!attr || (attrtype == BGP_ATTR_ENCAP
&& (!attr->encap_tunneltype
|| attr->encap_tunneltype == BGP_ENCAP_TYPE_MPLS)))
return;
switch (attrtype) {
case BGP_ATTR_ENCAP:
attrname = "Tunnel Encap";
subtlvs = attr->encap_subtlvs;
if (subtlvs == NULL) /* nothing to do */
return;
/*
* The tunnel encap attr has an "outer" tlv.
* T = tunneltype,
* L = total length of subtlvs,
* V = concatenated subtlvs.
*/
attrlenfield = 2 + 2; /* T + L */
attrhdrlen = 1 + 1; /* subTLV T + L */
break;
#ifdef ENABLE_BGP_VNC_ATTR
case BGP_ATTR_VNC:
attrname = "VNC";
subtlvs = bgp_attr_get_vnc_subtlvs(attr);
if (subtlvs == NULL) /* nothing to do */
return;
attrlenfield = 0; /* no outer T + L */
attrhdrlen = 2 + 2; /* subTLV T + L */
break;
#endif
default:
assert(0);
}
/* compute attr length */
for (st = subtlvs; st; st = st->next) {
attrlenfield += (attrhdrlen + st->length);
}
if (attrlenfield > 0xffff) {
zlog_info("%s attribute is too long (length=%d), can't send it",
attrname, attrlenfield);
return;
}
if (attrlenfield > 0xff) {
/* 2-octet length field */
stream_putc(s,
BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_EXTLEN);
stream_putc(s, attrtype);
stream_putw(s, attrlenfield & 0xffff);
} else {
/* 1-octet length field */
stream_putc(s, BGP_ATTR_FLAG_TRANS | BGP_ATTR_FLAG_OPTIONAL);
stream_putc(s, attrtype);
stream_putc(s, attrlenfield & 0xff);
}
if (attrtype == BGP_ATTR_ENCAP) {
/* write outer T+L */
stream_putw(s, attr->encap_tunneltype);
stream_putw(s, attrlenfield - 4);
}
/* write each sub-tlv */
for (st = subtlvs; st; st = st->next) {
if (attrtype == BGP_ATTR_ENCAP) {
stream_putc(s, st->type);
stream_putc(s, st->length);
#ifdef ENABLE_BGP_VNC
} else {
stream_putw(s, st->type);
stream_putw(s, st->length);
#endif
}
stream_put(s, st->value, st->length);
}
}
void bgp_packet_mpattr_end(struct stream *s, size_t sizep)
{
/* Set MP attribute length. Don't count the (2) bytes used to encode
the attr length */
stream_putw_at(s, sizep, (stream_get_endp(s) - sizep) - 2);
}
static bool bgp_append_local_as(struct peer *peer, afi_t afi, safi_t safi)
{
if (!BGP_AS_IS_PRIVATE(peer->local_as)
|| (BGP_AS_IS_PRIVATE(peer->local_as)
&& !CHECK_FLAG(peer->af_flags[afi][safi],
PEER_FLAG_REMOVE_PRIVATE_AS)
&& !CHECK_FLAG(peer->af_flags[afi][safi],
PEER_FLAG_REMOVE_PRIVATE_AS_ALL)
&& !CHECK_FLAG(peer->af_flags[afi][safi],
PEER_FLAG_REMOVE_PRIVATE_AS_REPLACE)
&& !CHECK_FLAG(peer->af_flags[afi][safi],
PEER_FLAG_REMOVE_PRIVATE_AS_ALL_REPLACE)))
return true;
return false;
}
/* Make attribute packet. */
bgp_size_t bgp_packet_attribute(struct bgp *bgp, struct peer *peer,
struct stream *s, struct attr *attr,
struct bpacket_attr_vec_arr *vecarr,
struct prefix *p, afi_t afi, safi_t safi,
struct peer *from, struct prefix_rd *prd,
mpls_label_t *label, uint32_t num_labels,
bool addpath_capable, uint32_t addpath_tx_id)
{
size_t cp;
size_t aspath_sizep;
struct aspath *aspath;
int send_as4_path = 0;
int send_as4_aggregator = 0;
bool use32bit = CHECK_FLAG(peer->cap, PEER_CAP_AS4_RCV)
&& CHECK_FLAG(peer->cap, PEER_CAP_AS4_ADV);
if (!bgp)
bgp = peer->bgp;
/* Remember current pointer. */
cp = stream_get_endp(s);
if (p
&& !((afi == AFI_IP && safi == SAFI_UNICAST)
&& !peer_cap_enhe(peer, afi, safi))) {
size_t mpattrlen_pos = 0;
mpattrlen_pos = bgp_packet_mpattr_start(s, peer, afi, safi,
vecarr, attr);
bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label,
num_labels, addpath_capable,
addpath_tx_id, attr);
bgp_packet_mpattr_end(s, mpattrlen_pos);
}
/* 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 == 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);
/* Even though we may not be configured for confederations we
* may have
* RXed an AS_PATH with AS_CONFED_SEQUENCE or AS_CONFED_SET */
aspath = aspath_delete_confed_seq(aspath);
if (CHECK_FLAG(bgp->config, BGP_CONFIG_CONFEDERATION)) {
/* Stuff our path CONFED_ID on the front */
aspath = aspath_add_seq(aspath, bgp->confed_id);
} else {
if (peer->change_local_as) {
/* If replace-as is specified, we only use the
change_local_as when
advertising routes. */
if (!CHECK_FLAG(peer->flags,
PEER_FLAG_LOCAL_AS_REPLACE_AS))
if (bgp_append_local_as(peer, afi,
safi))
aspath = aspath_add_seq(
aspath, peer->local_as);
aspath = aspath_add_seq(aspath,
peer->change_local_as);
} else {
aspath = aspath_add_seq(aspath, peer->local_as);
}
}
} else if (peer->sort == 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 (afi == AFI_IP && safi == SAFI_UNICAST
&& !peer_cap_enhe(peer, afi, safi)) {
afi_t nh_afi = BGP_NEXTHOP_AFI_FROM_NHLEN(attr->mp_nexthop_len);
if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP)) {
stream_putc(s, BGP_ATTR_FLAG_TRANS);
stream_putc(s, BGP_ATTR_NEXT_HOP);
bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s,
attr);
stream_putc(s, 4);
stream_put_ipv4(s, attr->nexthop.s_addr);
} else if (peer_cap_enhe(from, afi, safi)
|| (nh_afi == AFI_IP6)) {
/*
* Likely this is the case when an IPv4 prefix was
* received with Extended Next-hop capability in this
* or another vrf and is now being advertised to
* non-ENHE peers. Since peer_cap_enhe only checks
* peers in this vrf, also check the nh_afi to catch
* the case where the originator was in another vrf.
* Setting the mandatory (ipv4) next-hop attribute here
* to enable implicit next-hop self with correct A-F
* (ipv4 address family).
*/
stream_putc(s, BGP_ATTR_FLAG_TRANS);
stream_putc(s, BGP_ATTR_NEXT_HOP);
bpacket_attr_vec_arr_set_vec(vecarr, BGP_ATTR_VEC_NH, s,
NULL);
stream_putc(s, 4);
stream_put_ipv4(s, 0);
}
}
/* MED attribute. */
if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC)
|| bgp->maxmed_active) {
stream_putc(s, BGP_ATTR_FLAG_OPTIONAL);
stream_putc(s, BGP_ATTR_MULTI_EXIT_DISC);
stream_putc(s, 4);
stream_putl(s, (bgp->maxmed_active ? bgp->maxmed_value
: attr->med));
}
/* Local preference. */
if (peer->sort == BGP_PEER_IBGP || peer->sort == 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)) {
/* 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->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->aggregator_as > UINT16_MAX) {
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, (uint16_t)attr->aggregator_as);
}
stream_put_ipv4(s, attr->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))) {
struct community *comm = NULL;
comm = bgp_attr_get_community(attr);
if (comm->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, comm->size * 4);
} else {
stream_putc(s,
BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS);
stream_putc(s, BGP_ATTR_COMMUNITIES);
stream_putc(s, comm->size * 4);
}
stream_put(s, comm->val, comm->size * 4);
}
/*
* Large Community attribute.
*/
if (CHECK_FLAG(peer->af_flags[afi][safi],
PEER_FLAG_SEND_LARGE_COMMUNITY)
&& (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES))) {
if (lcom_length(bgp_attr_get_lcommunity(attr)) > 255) {
stream_putc(s,
BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS
| BGP_ATTR_FLAG_EXTLEN);
stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES);
stream_putw(s,
lcom_length(bgp_attr_get_lcommunity(attr)));
} else {
stream_putc(s,
BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS);
stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES);
stream_putc(s,
lcom_length(bgp_attr_get_lcommunity(attr)));
}
stream_put(s, bgp_attr_get_lcommunity(attr)->val,
lcom_length(bgp_attr_get_lcommunity(attr)));
}
/* Route Reflector. */
if (peer->sort == BGP_PEER_IBGP && from
&& from->sort == BGP_PEER_IBGP) {
struct cluster_list *cluster = bgp_attr_get_cluster(attr);
/* 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->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 (cluster) {
stream_putc(s, 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, cluster->list, 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);
}
}
/* 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 ecommunity *ecomm = bgp_attr_get_ecommunity(attr);
if (peer->sort == BGP_PEER_IBGP
|| peer->sort == BGP_PEER_CONFED) {
if (ecomm->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, ecomm->size * 8);
} else {
stream_putc(s,
BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS);
stream_putc(s, BGP_ATTR_EXT_COMMUNITIES);
stream_putc(s, ecomm->size * 8);
}
stream_put(s, ecomm->val, ecomm->size * 8);
} else {
uint8_t *pnt;
int tbit;
int ecom_tr_size = 0;
uint32_t i;
for (i = 0; i < ecomm->size; i++) {
pnt = ecomm->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 < ecomm->size; i++) {
pnt = ecomm->val + (i * 8);
tbit = *pnt;
if (CHECK_FLAG(
tbit,
ECOMMUNITY_FLAG_NON_TRANSITIVE))
continue;
stream_put(s, pnt, 8);
}
}
}
}
/* Label index attribute. */
if (safi == SAFI_LABELED_UNICAST) {
if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) {
uint32_t label_index;
label_index = attr->label_index;
if (label_index != BGP_INVALID_LABEL_INDEX) {
stream_putc(s,
BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS);
stream_putc(s, BGP_ATTR_PREFIX_SID);
stream_putc(s, 10);
stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX);
stream_putw(s,
BGP_PREFIX_SID_LABEL_INDEX_LENGTH);
stream_putc(s, 0); // reserved
stream_putw(s, 0); // flags
stream_putl(s, label_index);
}
}
}
/* SRv6 Service Information Attribute. */
if ((afi == AFI_IP || afi == AFI_IP6) && safi == SAFI_MPLS_VPN) {
if (attr->srv6_l3vpn) {
uint8_t subtlv_len =
BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE_LENGTH
+ BGP_ATTR_MIN_LEN
+ BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO_LENGTH;
uint8_t tlv_len = subtlv_len + BGP_ATTR_MIN_LEN + 1;
uint8_t attr_len = tlv_len + BGP_ATTR_MIN_LEN;
stream_putc(s, BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS);
stream_putc(s, BGP_ATTR_PREFIX_SID);
stream_putc(s, attr_len);
stream_putc(s, BGP_PREFIX_SID_SRV6_L3_SERVICE);
stream_putw(s, tlv_len);
stream_putc(s, 0); /* reserved */
stream_putc(s, BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO);
stream_putw(s, subtlv_len);
stream_putc(s, 0); /* reserved */
stream_put(s, &attr->srv6_l3vpn->sid,
sizeof(attr->srv6_l3vpn->sid)); /* sid */
stream_putc(s, 0); /* sid_flags */
stream_putw(s, 0xffff); /* endpoint */
stream_putc(s, 0); /* reserved */
stream_putc(
s,
BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE);
stream_putw(
s,
BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE_LENGTH);
stream_putc(s, attr->srv6_l3vpn->loc_block_len);
stream_putc(s, attr->srv6_l3vpn->loc_node_len);
stream_putc(s, attr->srv6_l3vpn->func_len);
stream_putc(s, attr->srv6_l3vpn->arg_len);
stream_putc(s, attr->srv6_l3vpn->transposition_len);
stream_putc(s, attr->srv6_l3vpn->transposition_offset);
} else if (attr->srv6_vpn) {
stream_putc(s, BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS);
stream_putc(s, BGP_ATTR_PREFIX_SID);
stream_putc(s, 22); /* tlv len */
stream_putc(s, BGP_PREFIX_SID_VPN_SID);
stream_putw(s, 0x13); /* tlv len */
stream_putc(s, 0x00); /* reserved */
stream_putc(s, 0x01); /* sid_type */
stream_putc(s, 0x00); /* sif_flags */
stream_put(s, &attr->srv6_vpn->sid,
sizeof(attr->srv6_vpn->sid)); /* sid */
}
}
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) {
/* 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->aggregator_as);
stream_put_ipv4(s, attr->aggregator_addr.s_addr);
}
if (((afi == AFI_IP || afi == AFI_IP6)
&& (safi == SAFI_ENCAP || safi == SAFI_MPLS_VPN))
|| (afi == AFI_L2VPN && safi == SAFI_EVPN)) {
/* Tunnel Encap attribute */
bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_ENCAP);
#ifdef ENABLE_BGP_VNC_ATTR
/* VNC attribute */
bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_VNC);
#endif
}
/* PMSI Tunnel */
if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL)) {
stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS);
stream_putc(s, BGP_ATTR_PMSI_TUNNEL);
stream_putc(s, 9); // Length
stream_putc(s, 0); // Flags
stream_putc(s, bgp_attr_get_pmsi_tnl_type(attr));
stream_put(s, &(attr->label),
BGP_LABEL_BYTES); // MPLS Label / VXLAN VNI
stream_put_ipv4(s, attr->nexthop.s_addr);
// Unicast tunnel endpoint IP address
}
/* Unknown transit attribute. */
struct transit *transit = bgp_attr_get_transit(attr);
if (transit)
stream_put(s, transit->val, transit->length);
/* Return total size of attribute. */
return stream_get_endp(s) - cp;
}
size_t bgp_packet_mpunreach_start(struct stream *s, afi_t afi, safi_t safi)
{
unsigned long attrlen_pnt;
iana_afi_t pkt_afi;
iana_safi_t pkt_safi;
/* Set extended bit always to encode the attribute length as 2 bytes */
stream_putc(s, BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_EXTLEN);
stream_putc(s, BGP_ATTR_MP_UNREACH_NLRI);
attrlen_pnt = stream_get_endp(s);
stream_putw(s, 0); /* Length of this attribute. */
/* Convert AFI, SAFI to values for packet. */
bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi);
stream_putw(s, pkt_afi);
stream_putc(s, pkt_safi);
return attrlen_pnt;
}
void bgp_packet_mpunreach_prefix(struct stream *s, const struct prefix *p,
afi_t afi, safi_t safi,
const struct prefix_rd *prd,
mpls_label_t *label, uint32_t num_labels,
bool addpath_capable, uint32_t addpath_tx_id,
struct attr *attr)
{
uint8_t wlabel[3] = {0x80, 0x00, 0x00};
if (safi == SAFI_LABELED_UNICAST) {
label = (mpls_label_t *)wlabel;
num_labels = 1;
}
bgp_packet_mpattr_prefix(s, afi, safi, p, prd, label, num_labels,
addpath_capable, addpath_tx_id, attr);
}
void bgp_packet_mpunreach_end(struct stream *s, size_t attrlen_pnt)
{
bgp_packet_mpattr_end(s, attrlen_pnt);
}
/* Initialization of attribute. */
void bgp_attr_init(void)
{
aspath_init();
attrhash_init();
community_init();
ecommunity_init();
lcommunity_init();
cluster_init();
transit_init();
encap_init();
srv6_init();
}
void bgp_attr_finish(void)
{
aspath_finish();
attrhash_finish();
community_finish();
ecommunity_finish();
lcommunity_finish();
cluster_finish();
transit_finish();
encap_finish();
srv6_finish();
}
/* Make attribute packet. */
void bgp_dump_routes_attr(struct stream *s, struct attr *attr,
const struct prefix *prefix)
{
unsigned long cp;
unsigned long len;
size_t aspath_lenp;
struct aspath *aspath;
bool addpath_capable = false;
uint32_t addpath_tx_id = 0;
/* 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 && prefix->family != AF_INET6) {
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)) {
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->aggregator_as);
stream_put_ipv4(s, attr->aggregator_addr.s_addr);
}
/* Community attribute. */
if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES)) {
struct community *comm = NULL;
comm = bgp_attr_get_community(attr);
if (comm->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, comm->size * 4);
} else {
stream_putc(s,
BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS);
stream_putc(s, BGP_ATTR_COMMUNITIES);
stream_putc(s, comm->size * 4);
}
stream_put(s, comm->val, comm->size * 4);
}
/* Large Community attribute. */
if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES)) {
if (lcom_length(bgp_attr_get_lcommunity(attr)) > 255) {
stream_putc(s,
BGP_ATTR_FLAG_OPTIONAL | BGP_ATTR_FLAG_TRANS
| BGP_ATTR_FLAG_EXTLEN);
stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES);
stream_putw(s,
lcom_length(bgp_attr_get_lcommunity(attr)));
} else {
stream_putc(s,
BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS);
stream_putc(s, BGP_ATTR_LARGE_COMMUNITIES);
stream_putc(s,
lcom_length(bgp_attr_get_lcommunity(attr)));
}
stream_put(s, bgp_attr_get_lcommunity(attr)->val,
lcom_length(bgp_attr_get_lcommunity(attr)));
}
/* Add a MP_NLRI attribute to dump the IPv6 next hop */
if (prefix != NULL && prefix->family == AF_INET6
&& (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL
|| attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL)) {
int sizep;
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, attr->mp_nexthop_len);
stream_put(s, &attr->mp_nexthop_global, IPV6_MAX_BYTELEN);
if (attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL)
stream_put(s, &attr->mp_nexthop_local,
IPV6_MAX_BYTELEN);
/* SNPA */
stream_putc(s, 0);
/* Prefix */
stream_put_prefix_addpath(s, prefix, addpath_capable,
addpath_tx_id);
/* Set MP attribute length. */
stream_putc_at(s, sizep, (stream_get_endp(s) - sizep) - 1);
}
/* Prefix SID */
if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PREFIX_SID)) {
if (attr->label_index != BGP_INVALID_LABEL_INDEX) {
stream_putc(s,
BGP_ATTR_FLAG_OPTIONAL
| BGP_ATTR_FLAG_TRANS);
stream_putc(s, BGP_ATTR_PREFIX_SID);
stream_putc(s, 10);
stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX);
stream_putc(s, BGP_PREFIX_SID_LABEL_INDEX_LENGTH);
stream_putc(s, 0); // reserved
stream_putw(s, 0); // flags
stream_putl(s, attr->label_index);
}
}
/* Return total size of attribute. */
len = stream_get_endp(s) - cp - 2;
stream_putw_at(s, cp, len);
}
|