summaryrefslogtreecommitdiffstats
path: root/contrib/tcpdump/print-802_11.c
blob: 3db98eaf8f7ee0845021f23c1e26b1764f7c5bd9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
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
/*
 * Copyright (c) 2001
 *	Fortress Technologies, Inc.  All rights reserved.
 *      Charlie Lenahan (clenahan@fortresstech.com)
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
 * the University nor the names of its contributors may be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

/* \summary: IEEE 802.11 printer */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <netdissect-stdinc.h>

#include <string.h>

#include "netdissect.h"
#include "addrtoname.h"

#include "extract.h"

#include "cpack.h"


/* Lengths of 802.11 header components. */
#define	IEEE802_11_FC_LEN		2
#define	IEEE802_11_DUR_LEN		2
#define	IEEE802_11_DA_LEN		6
#define	IEEE802_11_SA_LEN		6
#define	IEEE802_11_BSSID_LEN		6
#define	IEEE802_11_RA_LEN		6
#define	IEEE802_11_TA_LEN		6
#define	IEEE802_11_ADDR1_LEN		6
#define	IEEE802_11_SEQ_LEN		2
#define	IEEE802_11_CTL_LEN		2
#define	IEEE802_11_CARRIED_FC_LEN	2
#define	IEEE802_11_HT_CONTROL_LEN	4
#define	IEEE802_11_IV_LEN		3
#define	IEEE802_11_KID_LEN		1

/* Frame check sequence length. */
#define	IEEE802_11_FCS_LEN		4

/* Lengths of beacon components. */
#define	IEEE802_11_TSTAMP_LEN		8
#define	IEEE802_11_BCNINT_LEN		2
#define	IEEE802_11_CAPINFO_LEN		2
#define	IEEE802_11_LISTENINT_LEN	2

#define	IEEE802_11_AID_LEN		2
#define	IEEE802_11_STATUS_LEN		2
#define	IEEE802_11_REASON_LEN		2

/* Length of previous AP in reassocation frame */
#define	IEEE802_11_AP_LEN		6

#define	T_MGMT 0x0  /* management */
#define	T_CTRL 0x1  /* control */
#define	T_DATA 0x2 /* data */
#define	T_RESV 0x3  /* reserved */

#define	ST_ASSOC_REQUEST   	0x0
#define	ST_ASSOC_RESPONSE 	0x1
#define	ST_REASSOC_REQUEST   	0x2
#define	ST_REASSOC_RESPONSE  	0x3
#define	ST_PROBE_REQUEST   	0x4
#define	ST_PROBE_RESPONSE   	0x5
/* RESERVED 			0x6  */
/* RESERVED 			0x7  */
#define	ST_BEACON   		0x8
#define	ST_ATIM			0x9
#define	ST_DISASSOC		0xA
#define	ST_AUTH			0xB
#define	ST_DEAUTH		0xC
#define	ST_ACTION		0xD
/* RESERVED 			0xE  */
/* RESERVED 			0xF  */

static const struct tok st_str[] = {
	{ ST_ASSOC_REQUEST,    "Assoc Request"    },
	{ ST_ASSOC_RESPONSE,   "Assoc Response"   },
	{ ST_REASSOC_REQUEST,  "ReAssoc Request"  },
	{ ST_REASSOC_RESPONSE, "ReAssoc Response" },
	{ ST_PROBE_REQUEST,    "Probe Request"    },
	{ ST_PROBE_RESPONSE,   "Probe Response"   },
	{ ST_BEACON,           "Beacon"           },
	{ ST_ATIM,             "ATIM"             },
	{ ST_DISASSOC,         "Disassociation"   },
	{ ST_AUTH,             "Authentication"   },
	{ ST_DEAUTH,           "DeAuthentication" },
	{ ST_ACTION,           "Action"           },
	{ 0, NULL }
};

#define CTRL_CONTROL_WRAPPER	0x7
#define	CTRL_BAR	0x8
#define	CTRL_BA		0x9
#define	CTRL_PS_POLL	0xA
#define	CTRL_RTS	0xB
#define	CTRL_CTS	0xC
#define	CTRL_ACK	0xD
#define	CTRL_CF_END	0xE
#define	CTRL_END_ACK	0xF

static const struct tok ctrl_str[] = {
	{ CTRL_CONTROL_WRAPPER, "Control Wrapper" },
	{ CTRL_BAR,             "BAR"             },
	{ CTRL_BA,              "BA"              },
	{ CTRL_PS_POLL,         "Power Save-Poll" },
	{ CTRL_RTS,             "Request-To-Send" },
	{ CTRL_CTS,             "Clear-To-Send"   },
	{ CTRL_ACK,             "Acknowledgment"  },
	{ CTRL_CF_END,          "CF-End"          },
	{ CTRL_END_ACK,         "CF-End+CF-Ack"   },
	{ 0, NULL }
};

#define	DATA_DATA			0x0
#define	DATA_DATA_CF_ACK		0x1
#define	DATA_DATA_CF_POLL		0x2
#define	DATA_DATA_CF_ACK_POLL		0x3
#define	DATA_NODATA			0x4
#define	DATA_NODATA_CF_ACK		0x5
#define	DATA_NODATA_CF_POLL		0x6
#define	DATA_NODATA_CF_ACK_POLL		0x7

#define DATA_QOS_DATA			0x8
#define DATA_QOS_DATA_CF_ACK		0x9
#define DATA_QOS_DATA_CF_POLL		0xA
#define DATA_QOS_DATA_CF_ACK_POLL	0xB
#define DATA_QOS_NODATA			0xC
#define DATA_QOS_CF_POLL_NODATA		0xE
#define DATA_QOS_CF_ACK_POLL_NODATA	0xF

/*
 * The subtype field of a data frame is, in effect, composed of 4 flag
 * bits - CF-Ack, CF-Poll, Null (means the frame doesn't actually have
 * any data), and QoS.
 */
#define DATA_FRAME_IS_CF_ACK(x)		((x) & 0x01)
#define DATA_FRAME_IS_CF_POLL(x)	((x) & 0x02)
#define DATA_FRAME_IS_NULL(x)		((x) & 0x04)
#define DATA_FRAME_IS_QOS(x)		((x) & 0x08)

/*
 * Bits in the frame control field.
 */
#define	FC_VERSION(fc)		((fc) & 0x3)
#define	FC_TYPE(fc)		(((fc) >> 2) & 0x3)
#define	FC_SUBTYPE(fc)		(((fc) >> 4) & 0xF)
#define	FC_TO_DS(fc)		((fc) & 0x0100)
#define	FC_FROM_DS(fc)		((fc) & 0x0200)
#define	FC_MORE_FLAG(fc)	((fc) & 0x0400)
#define	FC_RETRY(fc)		((fc) & 0x0800)
#define	FC_POWER_MGMT(fc)	((fc) & 0x1000)
#define	FC_MORE_DATA(fc)	((fc) & 0x2000)
#define	FC_PROTECTED(fc)	((fc) & 0x4000)
#define	FC_ORDER(fc)		((fc) & 0x8000)

struct mgmt_header_t {
	uint16_t	fc;
	uint16_t 	duration;
	uint8_t		da[IEEE802_11_DA_LEN];
	uint8_t		sa[IEEE802_11_SA_LEN];
	uint8_t		bssid[IEEE802_11_BSSID_LEN];
	uint16_t	seq_ctrl;
};

#define	MGMT_HDRLEN	(IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+\
			 IEEE802_11_DA_LEN+IEEE802_11_SA_LEN+\
			 IEEE802_11_BSSID_LEN+IEEE802_11_SEQ_LEN)

#define	CAPABILITY_ESS(cap)	((cap) & 0x0001)
#define	CAPABILITY_IBSS(cap)	((cap) & 0x0002)
#define	CAPABILITY_CFP(cap)	((cap) & 0x0004)
#define	CAPABILITY_CFP_REQ(cap)	((cap) & 0x0008)
#define	CAPABILITY_PRIVACY(cap)	((cap) & 0x0010)

struct ssid_t {
	uint8_t		element_id;
	uint8_t		length;
	u_char		ssid[33];  /* 32 + 1 for null */
};

struct rates_t {
	uint8_t		element_id;
	uint8_t		length;
	uint8_t		rate[16];
};

struct challenge_t {
	uint8_t		element_id;
	uint8_t		length;
	uint8_t		text[254]; /* 1-253 + 1 for null */
};

struct fh_t {
	uint8_t		element_id;
	uint8_t		length;
	uint16_t	dwell_time;
	uint8_t		hop_set;
	uint8_t 	hop_pattern;
	uint8_t		hop_index;
};

struct ds_t {
	uint8_t		element_id;
	uint8_t		length;
	uint8_t		channel;
};

struct cf_t {
	uint8_t		element_id;
	uint8_t		length;
	uint8_t		count;
	uint8_t		period;
	uint16_t	max_duration;
	uint16_t	dur_remaing;
};

struct tim_t {
	uint8_t		element_id;
	uint8_t		length;
	uint8_t		count;
	uint8_t		period;
	uint8_t		bitmap_control;
	uint8_t		bitmap[251];
};

#define	E_SSID 		0
#define	E_RATES 	1
#define	E_FH	 	2
#define	E_DS 		3
#define	E_CF	 	4
#define	E_TIM	 	5
#define	E_IBSS 		6
/* reserved 		7 */
/* reserved 		8 */
/* reserved 		9 */
/* reserved 		10 */
/* reserved 		11 */
/* reserved 		12 */
/* reserved 		13 */
/* reserved 		14 */
/* reserved 		15 */
/* reserved 		16 */

#define	E_CHALLENGE 	16
/* reserved 		17 */
/* reserved 		18 */
/* reserved 		19 */
/* reserved 		16 */
/* reserved 		16 */


struct mgmt_body_t {
	uint8_t   	timestamp[IEEE802_11_TSTAMP_LEN];
	uint16_t  	beacon_interval;
	uint16_t 	listen_interval;
	uint16_t 	status_code;
	uint16_t 	aid;
	u_char		ap[IEEE802_11_AP_LEN];
	uint16_t	reason_code;
	uint16_t	auth_alg;
	uint16_t	auth_trans_seq_num;
	int		challenge_present;
	struct challenge_t  challenge;
	uint16_t	capability_info;
	int		ssid_present;
	struct ssid_t	ssid;
	int		rates_present;
	struct rates_t 	rates;
	int		ds_present;
	struct ds_t	ds;
	int		cf_present;
	struct cf_t	cf;
	int		fh_present;
	struct fh_t	fh;
	int		tim_present;
	struct tim_t	tim;
};

struct ctrl_control_wrapper_hdr_t {
	uint16_t	fc;
	uint16_t	duration;
	uint8_t		addr1[IEEE802_11_ADDR1_LEN];
	uint16_t	carried_fc[IEEE802_11_CARRIED_FC_LEN];
	uint16_t	ht_control[IEEE802_11_HT_CONTROL_LEN];
};

#define	CTRL_CONTROL_WRAPPER_HDRLEN	(IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+\
					 IEEE802_11_ADDR1_LEN+\
					 IEEE802_11_CARRIED_FC_LEN+\
					 IEEE802_11_HT_CONTROL_LEN)

struct ctrl_rts_hdr_t {
	uint16_t	fc;
	uint16_t	duration;
	uint8_t		ra[IEEE802_11_RA_LEN];
	uint8_t		ta[IEEE802_11_TA_LEN];
};

#define	CTRL_RTS_HDRLEN	(IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+\
			 IEEE802_11_RA_LEN+IEEE802_11_TA_LEN)

struct ctrl_cts_hdr_t {
	uint16_t	fc;
	uint16_t	duration;
	uint8_t		ra[IEEE802_11_RA_LEN];
};

#define	CTRL_CTS_HDRLEN	(IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+IEEE802_11_RA_LEN)

struct ctrl_ack_hdr_t {
	uint16_t	fc;
	uint16_t	duration;
	uint8_t		ra[IEEE802_11_RA_LEN];
};

#define	CTRL_ACK_HDRLEN	(IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+IEEE802_11_RA_LEN)

struct ctrl_ps_poll_hdr_t {
	uint16_t	fc;
	uint16_t	aid;
	uint8_t		bssid[IEEE802_11_BSSID_LEN];
	uint8_t		ta[IEEE802_11_TA_LEN];
};

#define	CTRL_PS_POLL_HDRLEN	(IEEE802_11_FC_LEN+IEEE802_11_AID_LEN+\
				 IEEE802_11_BSSID_LEN+IEEE802_11_TA_LEN)

struct ctrl_end_hdr_t {
	uint16_t	fc;
	uint16_t	duration;
	uint8_t		ra[IEEE802_11_RA_LEN];
	uint8_t		bssid[IEEE802_11_BSSID_LEN];
};

#define	CTRL_END_HDRLEN	(IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+\
			 IEEE802_11_RA_LEN+IEEE802_11_BSSID_LEN)

struct ctrl_end_ack_hdr_t {
	uint16_t	fc;
	uint16_t	duration;
	uint8_t		ra[IEEE802_11_RA_LEN];
	uint8_t		bssid[IEEE802_11_BSSID_LEN];
};

#define	CTRL_END_ACK_HDRLEN	(IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+\
				 IEEE802_11_RA_LEN+IEEE802_11_BSSID_LEN)

struct ctrl_ba_hdr_t {
	uint16_t	fc;
	uint16_t	duration;
	uint8_t		ra[IEEE802_11_RA_LEN];
};

#define	CTRL_BA_HDRLEN	(IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+IEEE802_11_RA_LEN)

struct ctrl_bar_hdr_t {
	uint16_t	fc;
	uint16_t	dur;
	uint8_t		ra[IEEE802_11_RA_LEN];
	uint8_t		ta[IEEE802_11_TA_LEN];
	uint16_t	ctl;
	uint16_t	seq;
};

#define	CTRL_BAR_HDRLEN		(IEEE802_11_FC_LEN+IEEE802_11_DUR_LEN+\
				 IEEE802_11_RA_LEN+IEEE802_11_TA_LEN+\
				 IEEE802_11_CTL_LEN+IEEE802_11_SEQ_LEN)

struct meshcntl_t {
	uint8_t		flags;
	uint8_t		ttl;
	uint8_t		seq[4];
	uint8_t		addr4[6];
	uint8_t		addr5[6];
	uint8_t		addr6[6];
};

#define	IV_IV(iv)	((iv) & 0xFFFFFF)
#define	IV_PAD(iv)	(((iv) >> 24) & 0x3F)
#define	IV_KEYID(iv)	(((iv) >> 30) & 0x03)

#define PRINT_SSID(p) \
	if (p.ssid_present) { \
		ND_PRINT((ndo, " (")); \
		fn_print(ndo, p.ssid.ssid, NULL); \
		ND_PRINT((ndo, ")")); \
	}

#define PRINT_RATE(_sep, _r, _suf) \
	ND_PRINT((ndo, "%s%2.1f%s", _sep, (.5 * ((_r) & 0x7f)), _suf))
#define PRINT_RATES(p) \
	if (p.rates_present) { \
		int z; \
		const char *sep = " ["; \
		for (z = 0; z < p.rates.length ; z++) { \
			PRINT_RATE(sep, p.rates.rate[z], \
				(p.rates.rate[z] & 0x80 ? "*" : "")); \
			sep = " "; \
		} \
		if (p.rates.length != 0) \
			ND_PRINT((ndo, " Mbit]")); \
	}

#define PRINT_DS_CHANNEL(p) \
	if (p.ds_present) \
		ND_PRINT((ndo, " CH: %u", p.ds.channel)); \
	ND_PRINT((ndo, "%s", \
	    CAPABILITY_PRIVACY(p.capability_info) ? ", PRIVACY" : ""));

#define MAX_MCS_INDEX	76

/*
 * Indices are:
 *
 *	the MCS index (0-76);
 *
 *	0 for 20 MHz, 1 for 40 MHz;
 *
 *	0 for a long guard interval, 1 for a short guard interval.
 */
static const float ieee80211_float_htrates[MAX_MCS_INDEX+1][2][2] = {
	/* MCS  0  */
	{	/* 20 Mhz */ {    6.5,		/* SGI */    7.2, },
		/* 40 Mhz */ {   13.5,		/* SGI */   15.0, },
	},

	/* MCS  1  */
	{	/* 20 Mhz */ {   13.0,		/* SGI */   14.4, },
		/* 40 Mhz */ {   27.0,		/* SGI */   30.0, },
	},

	/* MCS  2  */
	{	/* 20 Mhz */ {   19.5,		/* SGI */   21.7, },
		/* 40 Mhz */ {   40.5,		/* SGI */   45.0, },
	},

	/* MCS  3  */
	{	/* 20 Mhz */ {   26.0,		/* SGI */   28.9, },
		/* 40 Mhz */ {   54.0,		/* SGI */   60.0, },
	},

	/* MCS  4  */
	{	/* 20 Mhz */ {   39.0,		/* SGI */   43.3, },
		/* 40 Mhz */ {   81.0,		/* SGI */   90.0, },
	},

	/* MCS  5  */
	{	/* 20 Mhz */ {   52.0,		/* SGI */   57.8, },
		/* 40 Mhz */ {  108.0,		/* SGI */  120.0, },
	},

	/* MCS  6  */
	{	/* 20 Mhz */ {   58.5,		/* SGI */   65.0, },
		/* 40 Mhz */ {  121.5,		/* SGI */  135.0, },
	},

	/* MCS  7  */
	{	/* 20 Mhz */ {   65.0,		/* SGI */   72.2, },
		/* 40 Mhz */ {   135.0,		/* SGI */  150.0, },
	},

	/* MCS  8  */
	{	/* 20 Mhz */ {   13.0,		/* SGI */   14.4, },
		/* 40 Mhz */ {   27.0,		/* SGI */   30.0, },
	},

	/* MCS  9  */
	{	/* 20 Mhz */ {   26.0,		/* SGI */   28.9, },
		/* 40 Mhz */ {   54.0,		/* SGI */   60.0, },
	},

	/* MCS 10  */
	{	/* 20 Mhz */ {   39.0,		/* SGI */   43.3, },
		/* 40 Mhz */ {   81.0,		/* SGI */   90.0, },
	},

	/* MCS 11  */
	{	/* 20 Mhz */ {   52.0,		/* SGI */   57.8, },
		/* 40 Mhz */ {  108.0,		/* SGI */  120.0, },
	},

	/* MCS 12  */
	{	/* 20 Mhz */ {   78.0,		/* SGI */   86.7, },
		/* 40 Mhz */ {  162.0,		/* SGI */  180.0, },
	},

	/* MCS 13  */
	{	/* 20 Mhz */ {  104.0,		/* SGI */  115.6, },
		/* 40 Mhz */ {  216.0,		/* SGI */  240.0, },
	},

	/* MCS 14  */
	{	/* 20 Mhz */ {  117.0,		/* SGI */  130.0, },
		/* 40 Mhz */ {  243.0,		/* SGI */  270.0, },
	},

	/* MCS 15  */
	{	/* 20 Mhz */ {  130.0,		/* SGI */  144.4, },
		/* 40 Mhz */ {  270.0,		/* SGI */  300.0, },
	},

	/* MCS 16  */
	{	/* 20 Mhz */ {   19.5,		/* SGI */   21.7, },
		/* 40 Mhz */ {   40.5,		/* SGI */   45.0, },
	},

	/* MCS 17  */
	{	/* 20 Mhz */ {   39.0,		/* SGI */   43.3, },
		/* 40 Mhz */ {   81.0,		/* SGI */   90.0, },
	},

	/* MCS 18  */
	{	/* 20 Mhz */ {   58.5,		/* SGI */   65.0, },
		/* 40 Mhz */ {  121.5,		/* SGI */  135.0, },
	},

	/* MCS 19  */
	{	/* 20 Mhz */ {   78.0,		/* SGI */   86.7, },
		/* 40 Mhz */ {  162.0,		/* SGI */  180.0, },
	},

	/* MCS 20  */
	{	/* 20 Mhz */ {  117.0,		/* SGI */  130.0, },
		/* 40 Mhz */ {  243.0,		/* SGI */  270.0, },
	},

	/* MCS 21  */
	{	/* 20 Mhz */ {  156.0,		/* SGI */  173.3, },
		/* 40 Mhz */ {  324.0,		/* SGI */  360.0, },
	},

	/* MCS 22  */
	{	/* 20 Mhz */ {  175.5,		/* SGI */  195.0, },
		/* 40 Mhz */ {  364.5,		/* SGI */  405.0, },
	},

	/* MCS 23  */
	{	/* 20 Mhz */ {  195.0,		/* SGI */  216.7, },
		/* 40 Mhz */ {  405.0,		/* SGI */  450.0, },
	},

	/* MCS 24  */
	{	/* 20 Mhz */ {   26.0,		/* SGI */   28.9, },
		/* 40 Mhz */ {   54.0,		/* SGI */   60.0, },
	},

	/* MCS 25  */
	{	/* 20 Mhz */ {   52.0,		/* SGI */   57.8, },
		/* 40 Mhz */ {  108.0,		/* SGI */  120.0, },
	},

	/* MCS 26  */
	{	/* 20 Mhz */ {   78.0,		/* SGI */   86.7, },
		/* 40 Mhz */ {  162.0,		/* SGI */  180.0, },
	},

	/* MCS 27  */
	{	/* 20 Mhz */ {  104.0,		/* SGI */  115.6, },
		/* 40 Mhz */ {  216.0,		/* SGI */  240.0, },
	},

	/* MCS 28  */
	{	/* 20 Mhz */ {  156.0,		/* SGI */  173.3, },
		/* 40 Mhz */ {  324.0,		/* SGI */  360.0, },
	},

	/* MCS 29  */
	{	/* 20 Mhz */ {  208.0,		/* SGI */  231.1, },
		/* 40 Mhz */ {  432.0,		/* SGI */  480.0, },
	},

	/* MCS 30  */
	{	/* 20 Mhz */ {  234.0,		/* SGI */  260.0, },
		/* 40 Mhz */ {  486.0,		/* SGI */  540.0, },
	},

	/* MCS 31  */
	{	/* 20 Mhz */ {  260.0,		/* SGI */  288.9, },
		/* 40 Mhz */ {  540.0,		/* SGI */  600.0, },
	},

	/* MCS 32  */
	{	/* 20 Mhz */ {    0.0,		/* SGI */    0.0, }, /* not valid */
		/* 40 Mhz */ {    6.0,		/* SGI */    6.7, },
	},

	/* MCS 33  */
	{	/* 20 Mhz */ {   39.0,		/* SGI */   43.3, },
		/* 40 Mhz */ {   81.0,		/* SGI */   90.0, },
	},

	/* MCS 34  */
	{	/* 20 Mhz */ {   52.0,		/* SGI */   57.8, },
		/* 40 Mhz */ {  108.0,		/* SGI */  120.0, },
	},

	/* MCS 35  */
	{	/* 20 Mhz */ {   65.0,		/* SGI */   72.2, },
		/* 40 Mhz */ {  135.0,		/* SGI */  150.0, },
	},

	/* MCS 36  */
	{	/* 20 Mhz */ {   58.5,		/* SGI */   65.0, },
		/* 40 Mhz */ {  121.5,		/* SGI */  135.0, },
	},

	/* MCS 37  */
	{	/* 20 Mhz */ {   78.0,		/* SGI */   86.7, },
		/* 40 Mhz */ {  162.0,		/* SGI */  180.0, },
	},

	/* MCS 38  */
	{	/* 20 Mhz */ {   97.5,		/* SGI */  108.3, },
		/* 40 Mhz */ {  202.5,		/* SGI */  225.0, },
	},

	/* MCS 39  */
	{	/* 20 Mhz */ {   52.0,		/* SGI */   57.8, },
		/* 40 Mhz */ {  108.0,		/* SGI */  120.0, },
	},

	/* MCS 40  */
	{	/* 20 Mhz */ {   65.0,		/* SGI */   72.2, },
		/* 40 Mhz */ {  135.0,		/* SGI */  150.0, },
	},

	/* MCS 41  */
	{	/* 20 Mhz */ {   65.0,		/* SGI */   72.2, },
		/* 40 Mhz */ {  135.0,		/* SGI */  150.0, },
	},

	/* MCS 42  */
	{	/* 20 Mhz */ {   78.0,		/* SGI */   86.7, },
		/* 40 Mhz */ {  162.0,		/* SGI */  180.0, },
	},

	/* MCS 43  */
	{	/* 20 Mhz */ {   91.0,		/* SGI */  101.1, },
		/* 40 Mhz */ {  189.0,		/* SGI */  210.0, },
	},

	/* MCS 44  */
	{	/* 20 Mhz */ {   91.0,		/* SGI */  101.1, },
		/* 40 Mhz */ {  189.0,		/* SGI */  210.0, },
	},

	/* MCS 45  */
	{	/* 20 Mhz */ {  104.0,		/* SGI */  115.6, },
		/* 40 Mhz */ {  216.0,		/* SGI */  240.0, },
	},

	/* MCS 46  */
	{	/* 20 Mhz */ {   78.0,		/* SGI */   86.7, },
		/* 40 Mhz */ {  162.0,		/* SGI */  180.0, },
	},

	/* MCS 47  */
	{	/* 20 Mhz */ {   97.5,		/* SGI */  108.3, },
		/* 40 Mhz */ {  202.5,		/* SGI */  225.0, },
	},

	/* MCS 48  */
	{	/* 20 Mhz */ {   97.5,		/* SGI */  108.3, },
		/* 40 Mhz */ {  202.5,		/* SGI */  225.0, },
	},

	/* MCS 49  */
	{	/* 20 Mhz */ {  117.0,		/* SGI */  130.0, },
		/* 40 Mhz */ {  243.0,		/* SGI */  270.0, },
	},

	/* MCS 50  */
	{	/* 20 Mhz */ {  136.5,		/* SGI */  151.7, },
		/* 40 Mhz */ {  283.5,		/* SGI */  315.0, },
	},

	/* MCS 51  */
	{	/* 20 Mhz */ {  136.5,		/* SGI */  151.7, },
		/* 40 Mhz */ {  283.5,		/* SGI */  315.0, },
	},

	/* MCS 52  */
	{	/* 20 Mhz */ {  156.0,		/* SGI */  173.3, },
		/* 40 Mhz */ {  324.0,		/* SGI */  360.0, },
	},

	/* MCS 53  */
	{	/* 20 Mhz */ {   65.0,		/* SGI */   72.2, },
		/* 40 Mhz */ {  135.0,		/* SGI */  150.0, },
	},

	/* MCS 54  */
	{	/* 20 Mhz */ {   78.0,		/* SGI */   86.7, },
		/* 40 Mhz */ {  162.0,		/* SGI */  180.0, },
	},

	/* MCS 55  */
	{	/* 20 Mhz */ {   91.0,		/* SGI */  101.1, },
		/* 40 Mhz */ {  189.0,		/* SGI */  210.0, },
	},

	/* MCS 56  */
	{	/* 20 Mhz */ {   78.0,		/* SGI */   86.7, },
		/* 40 Mhz */ {  162.0,		/* SGI */  180.0, },
	},

	/* MCS 57  */
	{	/* 20 Mhz */ {   91.0,		/* SGI */  101.1, },
		/* 40 Mhz */ {  189.0,		/* SGI */  210.0, },
	},

	/* MCS 58  */
	{	/* 20 Mhz */ {  104.0,		/* SGI */  115.6, },
		/* 40 Mhz */ {  216.0,		/* SGI */  240.0, },
	},

	/* MCS 59  */
	{	/* 20 Mhz */ {  117.0,		/* SGI */  130.0, },
		/* 40 Mhz */ {  243.0,		/* SGI */  270.0, },
	},

	/* MCS 60  */
	{	/* 20 Mhz */ {  104.0,		/* SGI */  115.6, },
		/* 40 Mhz */ {  216.0,		/* SGI */  240.0, },
	},

	/* MCS 61  */
	{	/* 20 Mhz */ {  117.0,		/* SGI */  130.0, },
		/* 40 Mhz */ {  243.0,		/* SGI */  270.0, },
	},

	/* MCS 62  */
	{	/* 20 Mhz */ {  130.0,		/* SGI */  144.4, },
		/* 40 Mhz */ {  270.0,		/* SGI */  300.0, },
	},

	/* MCS 63  */
	{	/* 20 Mhz */ {  130.0,		/* SGI */  144.4, },
		/* 40 Mhz */ {  270.0,		/* SGI */  300.0, },
	},

	/* MCS 64  */
	{	/* 20 Mhz */ {  143.0,		/* SGI */  158.9, },
		/* 40 Mhz */ {  297.0,		/* SGI */  330.0, },
	},

	/* MCS 65  */
	{	/* 20 Mhz */ {   97.5,		/* SGI */  108.3, },
		/* 40 Mhz */ {  202.5,		/* SGI */  225.0, },
	},

	/* MCS 66  */
	{	/* 20 Mhz */ {  117.0,		/* SGI */  130.0, },
		/* 40 Mhz */ {  243.0,		/* SGI */  270.0, },
	},

	/* MCS 67  */
	{	/* 20 Mhz */ {  136.5,		/* SGI */  151.7, },
		/* 40 Mhz */ {  283.5,		/* SGI */  315.0, },
	},

	/* MCS 68  */
	{	/* 20 Mhz */ {  117.0,		/* SGI */  130.0, },
		/* 40 Mhz */ {  243.0,		/* SGI */  270.0, },
	},

	/* MCS 69  */
	{	/* 20 Mhz */ {  136.5,		/* SGI */  151.7, },
		/* 40 Mhz */ {  283.5,		/* SGI */  315.0, },
	},

	/* MCS 70  */
	{	/* 20 Mhz */ {  156.0,		/* SGI */  173.3, },
		/* 40 Mhz */ {  324.0,		/* SGI */  360.0, },
	},

	/* MCS 71  */
	{	/* 20 Mhz */ {  175.5,		/* SGI */  195.0, },
		/* 40 Mhz */ {  364.5,		/* SGI */  405.0, },
	},

	/* MCS 72  */
	{	/* 20 Mhz */ {  156.0,		/* SGI */  173.3, },
		/* 40 Mhz */ {  324.0,		/* SGI */  360.0, },
	},

	/* MCS 73  */
	{	/* 20 Mhz */ {  175.5,		/* SGI */  195.0, },
		/* 40 Mhz */ {  364.5,		/* SGI */  405.0, },
	},

	/* MCS 74  */
	{	/* 20 Mhz */ {  195.0,		/* SGI */  216.7, },
		/* 40 Mhz */ {  405.0,		/* SGI */  450.0, },
	},

	/* MCS 75  */
	{	/* 20 Mhz */ {  195.0,		/* SGI */  216.7, },
		/* 40 Mhz */ {  405.0,		/* SGI */  450.0, },
	},

	/* MCS 76  */
	{	/* 20 Mhz */ {  214.5,		/* SGI */  238.3, },
		/* 40 Mhz */ {  445.5,		/* SGI */  495.0, },
	},
};

static const char *auth_alg_text[]={"Open System","Shared Key","EAP"};
#define NUM_AUTH_ALGS	(sizeof auth_alg_text / sizeof auth_alg_text[0])

static const char *status_text[] = {
	"Successful",						/*  0 */
	"Unspecified failure",					/*  1 */
	"Reserved",						/*  2 */
	"Reserved",						/*  3 */
	"Reserved",						/*  4 */
	"Reserved",						/*  5 */
	"Reserved",						/*  6 */
	"Reserved",						/*  7 */
	"Reserved",						/*  8 */
	"Reserved",						/*  9 */
	"Cannot Support all requested capabilities in the Capability "
	  "Information field",	  				/* 10 */
	"Reassociation denied due to inability to confirm that association "
	  "exists",						/* 11 */
	"Association denied due to reason outside the scope of the "
	  "standard",						/* 12 */
	"Responding station does not support the specified authentication "
	  "algorithm ",						/* 13 */
	"Received an Authentication frame with authentication transaction "
	  "sequence number out of expected sequence",		/* 14 */
	"Authentication rejected because of challenge failure",	/* 15 */
	"Authentication rejected due to timeout waiting for next frame in "
	  "sequence",	  					/* 16 */
	"Association denied because AP is unable to handle additional"
	  "associated stations",	  			/* 17 */
	"Association denied due to requesting station not supporting all of "
	  "the data rates in BSSBasicRateSet parameter",	/* 18 */
	"Association denied due to requesting station not supporting "
	  "short preamble operation",				/* 19 */
	"Association denied due to requesting station not supporting "
	  "PBCC encoding",					/* 20 */
	"Association denied due to requesting station not supporting "
	  "channel agility",					/* 21 */
	"Association request rejected because Spectrum Management "
	  "capability is required",				/* 22 */
	"Association request rejected because the information in the "
	  "Power Capability element is unacceptable",		/* 23 */
	"Association request rejected because the information in the "
	  "Supported Channels element is unacceptable",		/* 24 */
	"Association denied due to requesting station not supporting "
	  "short slot operation",				/* 25 */
	"Association denied due to requesting station not supporting "
	  "DSSS-OFDM operation",				/* 26 */
	"Association denied because the requested STA does not support HT "
	  "features",						/* 27 */
	"Reserved",						/* 28 */
	"Association denied because the requested STA does not support "
	  "the PCO transition time required by the AP",		/* 29 */
	"Reserved",						/* 30 */
	"Reserved",						/* 31 */
	"Unspecified, QoS-related failure",			/* 32 */
	"Association denied due to QAP having insufficient bandwidth "
	  "to handle another QSTA",				/* 33 */
	"Association denied due to excessive frame loss rates and/or "
	  "poor conditions on current operating channel",	/* 34 */
	"Association (with QBSS) denied due to requesting station not "
	  "supporting the QoS facility",			/* 35 */
	"Association denied due to requesting station not supporting "
	  "Block Ack",						/* 36 */
	"The request has been declined",			/* 37 */
	"The request has not been successful as one or more parameters "
	  "have invalid values",				/* 38 */
	"The TS has not been created because the request cannot be honored. "
	  "Try again with the suggested changes to the TSPEC",	/* 39 */
	"Invalid Information Element",				/* 40 */
	"Group Cipher is not valid",				/* 41 */
	"Pairwise Cipher is not valid",				/* 42 */
	"AKMP is not valid",					/* 43 */
	"Unsupported RSN IE version",				/* 44 */
	"Invalid RSN IE Capabilities",				/* 45 */
	"Cipher suite is rejected per security policy",		/* 46 */
	"The TS has not been created. However, the HC may be capable of "
	  "creating a TS, in response to a request, after the time indicated "
	  "in the TS Delay element",				/* 47 */
	"Direct Link is not allowed in the BSS by policy",	/* 48 */
	"Destination STA is not present within this QBSS.",	/* 49 */
	"The Destination STA is not a QSTA.",			/* 50 */

};
#define NUM_STATUSES	(sizeof status_text / sizeof status_text[0])

static const char *reason_text[] = {
	"Reserved",						/* 0 */
	"Unspecified reason",					/* 1 */
	"Previous authentication no longer valid",  		/* 2 */
	"Deauthenticated because sending station is leaving (or has left) "
	  "IBSS or ESS",					/* 3 */
	"Disassociated due to inactivity",			/* 4 */
	"Disassociated because AP is unable to handle all currently "
	  " associated stations",				/* 5 */
	"Class 2 frame received from nonauthenticated station", /* 6 */
	"Class 3 frame received from nonassociated station",	/* 7 */
	"Disassociated because sending station is leaving "
	  "(or has left) BSS",					/* 8 */
	"Station requesting (re)association is not authenticated with "
	  "responding station",					/* 9 */
	"Disassociated because the information in the Power Capability "
	  "element is unacceptable",				/* 10 */
	"Disassociated because the information in the SupportedChannels "
	  "element is unacceptable",				/* 11 */
	"Invalid Information Element",				/* 12 */
	"Reserved",						/* 13 */
	"Michael MIC failure",					/* 14 */
	"4-Way Handshake timeout",				/* 15 */
	"Group key update timeout",				/* 16 */
	"Information element in 4-Way Handshake different from (Re)Association"
	  "Request/Probe Response/Beacon",			/* 17 */
	"Group Cipher is not valid",				/* 18 */
	"AKMP is not valid",					/* 20 */
	"Unsupported RSN IE version",				/* 21 */
	"Invalid RSN IE Capabilities",				/* 22 */
	"IEEE 802.1X Authentication failed",			/* 23 */
	"Cipher suite is rejected per security policy",		/* 24 */
	"Reserved",						/* 25 */
	"Reserved",						/* 26 */
	"Reserved",						/* 27 */
	"Reserved",						/* 28 */
	"Reserved",						/* 29 */
	"Reserved",						/* 30 */
	"TS deleted because QoS AP lacks sufficient bandwidth for this "
	  "QoS STA due to a change in BSS service characteristics or "
	  "operational mode (e.g. an HT BSS change from 40 MHz channel "
	  "to 20 MHz channel)",					/* 31 */
	"Disassociated for unspecified, QoS-related reason",	/* 32 */
	"Disassociated because QoS AP lacks sufficient bandwidth for this "
	  "QoS STA",						/* 33 */
	"Disassociated because of excessive number of frames that need to be "
          "acknowledged, but are not acknowledged for AP transmissions "
	  "and/or poor channel conditions",			/* 34 */
	"Disassociated because STA is transmitting outside the limits "
	  "of its TXOPs",					/* 35 */
	"Requested from peer STA as the STA is leaving the BSS "
	  "(or resetting)",					/* 36 */
	"Requested from peer STA as it does not want to use the "
	  "mechanism",						/* 37 */
	"Requested from peer STA as the STA received frames using the "
	  "mechanism for which a set up is required",		/* 38 */
	"Requested from peer STA due to time out",		/* 39 */
	"Reserved",						/* 40 */
	"Reserved",						/* 41 */
	"Reserved",						/* 42 */
	"Reserved",						/* 43 */
	"Reserved",						/* 44 */
	"Peer STA does not support the requested cipher suite",	/* 45 */
	"Association denied due to requesting STA not supporting HT "
	  "features",						/* 46 */
};
#define NUM_REASONS	(sizeof reason_text / sizeof reason_text[0])

static int
wep_print(netdissect_options *ndo,
          const u_char *p)
{
	uint32_t iv;

	if (!ND_TTEST2(*p, IEEE802_11_IV_LEN + IEEE802_11_KID_LEN))
		return 0;
	iv = EXTRACT_LE_32BITS(p);

	ND_PRINT((ndo, " IV:%3x Pad %x KeyID %x", IV_IV(iv), IV_PAD(iv),
	    IV_KEYID(iv)));

	return 1;
}

static int
parse_elements(netdissect_options *ndo,
               struct mgmt_body_t *pbody, const u_char *p, int offset,
               u_int length)
{
	u_int elementlen;
	struct ssid_t ssid;
	struct challenge_t challenge;
	struct rates_t rates;
	struct ds_t ds;
	struct cf_t cf;
	struct tim_t tim;

	/*
	 * We haven't seen any elements yet.
	 */
	pbody->challenge_present = 0;
	pbody->ssid_present = 0;
	pbody->rates_present = 0;
	pbody->ds_present = 0;
	pbody->cf_present = 0;
	pbody->tim_present = 0;

	while (length != 0) {
		/* Make sure we at least have the element ID and length. */
		if (!ND_TTEST2(*(p + offset), 2))
			return 0;
		if (length < 2)
			return 0;
		elementlen = *(p + offset + 1);

		/* Make sure we have the entire element. */
		if (!ND_TTEST2(*(p + offset + 2), elementlen))
			return 0;
		if (length < elementlen + 2)
			return 0;

		switch (*(p + offset)) {
		case E_SSID:
			memcpy(&ssid, p + offset, 2);
			offset += 2;
			length -= 2;
			if (ssid.length != 0) {
				if (ssid.length > sizeof(ssid.ssid) - 1)
					return 0;
				if (!ND_TTEST2(*(p + offset), ssid.length))
					return 0;
				if (length < ssid.length)
					return 0;
				memcpy(&ssid.ssid, p + offset, ssid.length);
				offset += ssid.length;
				length -= ssid.length;
			}
			ssid.ssid[ssid.length] = '\0';
			/*
			 * Present and not truncated.
			 *
			 * If we haven't already seen an SSID IE,
			 * copy this one, otherwise ignore this one,
			 * so we later report the first one we saw.
			 */
			if (!pbody->ssid_present) {
				pbody->ssid = ssid;
				pbody->ssid_present = 1;
			}
			break;
		case E_CHALLENGE:
			memcpy(&challenge, p + offset, 2);
			offset += 2;
			length -= 2;
			if (challenge.length != 0) {
				if (challenge.length >
				    sizeof(challenge.text) - 1)
					return 0;
				if (!ND_TTEST2(*(p + offset), challenge.length))
					return 0;
				if (length < challenge.length)
					return 0;
				memcpy(&challenge.text, p + offset,
				    challenge.length);
				offset += challenge.length;
				length -= challenge.length;
			}
			challenge.text[challenge.length] = '\0';
			/*
			 * Present and not truncated.
			 *
			 * If we haven't already seen a challenge IE,
			 * copy this one, otherwise ignore this one,
			 * so we later report the first one we saw.
			 */
			if (!pbody->challenge_present) {
				pbody->challenge = challenge;
				pbody->challenge_present = 1;
			}
			break;
		case E_RATES:
			memcpy(&rates, p + offset, 2);
			offset += 2;
			length -= 2;
			if (rates.length != 0) {
				if (rates.length > sizeof rates.rate)
					return 0;
				if (!ND_TTEST2(*(p + offset), rates.length))
					return 0;
				if (length < rates.length)
					return 0;
				memcpy(&rates.rate, p + offset, rates.length);
				offset += rates.length;
				length -= rates.length;
			}
			/*
			 * Present and not truncated.
			 *
			 * If we haven't already seen a rates IE,
			 * copy this one if it's not zero-length,
			 * otherwise ignore this one, so we later
			 * report the first one we saw.
			 *
			 * We ignore zero-length rates IEs as some
			 * devices seem to put a zero-length rates
			 * IE, followed by an SSID IE, followed by
			 * a non-zero-length rates IE into frames,
			 * even though IEEE Std 802.11-2007 doesn't
			 * seem to indicate that a zero-length rates
			 * IE is valid.
			 */
			if (!pbody->rates_present && rates.length != 0) {
				pbody->rates = rates;
				pbody->rates_present = 1;
			}
			break;
		case E_DS:
			memcpy(&ds, p + offset, 2);
			offset += 2;
			length -= 2;
			if (ds.length != 1) {
				offset += ds.length;
				length -= ds.length;
				break;
			}
			ds.channel = *(p + offset);
			offset += 1;
			length -= 1;
			/*
			 * Present and not truncated.
			 *
			 * If we haven't already seen a DS IE,
			 * copy this one, otherwise ignore this one,
			 * so we later report the first one we saw.
			 */
			if (!pbody->ds_present) {
				pbody->ds = ds;
				pbody->ds_present = 1;
			}
			break;
		case E_CF:
			memcpy(&cf, p + offset, 2);
			offset += 2;
			length -= 2;
			if (cf.length != 6) {
				offset += cf.length;
				length -= cf.length;
				break;
			}
			memcpy(&cf.count, p + offset, 6);
			offset += 6;
			length -= 6;
			/*
			 * Present and not truncated.
			 *
			 * If we haven't already seen a CF IE,
			 * copy this one, otherwise ignore this one,
			 * so we later report the first one we saw.
			 */
			if (!pbody->cf_present) {
				pbody->cf = cf;
				pbody->cf_present = 1;
			}
			break;
		case E_TIM:
			memcpy(&tim, p + offset, 2);
			offset += 2;
			length -= 2;
			if (tim.length <= 3) {
				offset += tim.length;
				length -= tim.length;
				break;
			}
			if (tim.length - 3 > (int)sizeof tim.bitmap)
				return 0;
			memcpy(&tim.count, p + offset, 3);
			offset += 3;
			length -= 3;

			memcpy(tim.bitmap, p + (tim.length - 3),
			    (tim.length - 3));
			offset += tim.length - 3;
			length -= tim.length - 3;
			/*
			 * Present and not truncated.
			 *
			 * If we haven't already seen a TIM IE,
			 * copy this one, otherwise ignore this one,
			 * so we later report the first one we saw.
			 */
			if (!pbody->tim_present) {
				pbody->tim = tim;
				pbody->tim_present = 1;
			}
			break;
		default:
#if 0
			ND_PRINT((ndo, "(1) unhandled element_id (%d)  ",
			    *(p + offset)));
#endif
			offset += 2 + elementlen;
			length -= 2 + elementlen;
			break;
		}
	}

	/* No problems found. */
	return 1;
}

/*********************************************************************************
 * Print Handle functions for the management frame types
 *********************************************************************************/

static int
handle_beacon(netdissect_options *ndo,
              const u_char *p, u_int length)
{
	struct mgmt_body_t pbody;
	int offset = 0;
	int ret;

	memset(&pbody, 0, sizeof(pbody));

	if (!ND_TTEST2(*p, IEEE802_11_TSTAMP_LEN + IEEE802_11_BCNINT_LEN +
	    IEEE802_11_CAPINFO_LEN))
		return 0;
	if (length < IEEE802_11_TSTAMP_LEN + IEEE802_11_BCNINT_LEN +
	    IEEE802_11_CAPINFO_LEN)
		return 0;
	memcpy(&pbody.timestamp, p, IEEE802_11_TSTAMP_LEN);
	offset += IEEE802_11_TSTAMP_LEN;
	length -= IEEE802_11_TSTAMP_LEN;
	pbody.beacon_interval = EXTRACT_LE_16BITS(p+offset);
	offset += IEEE802_11_BCNINT_LEN;
	length -= IEEE802_11_BCNINT_LEN;
	pbody.capability_info = EXTRACT_LE_16BITS(p+offset);
	offset += IEEE802_11_CAPINFO_LEN;
	length -= IEEE802_11_CAPINFO_LEN;

	ret = parse_elements(ndo, &pbody, p, offset, length);

	PRINT_SSID(pbody);
	PRINT_RATES(pbody);
	ND_PRINT((ndo, " %s",
	    CAPABILITY_ESS(pbody.capability_info) ? "ESS" : "IBSS"));
	PRINT_DS_CHANNEL(pbody);

	return ret;
}

static int
handle_assoc_request(netdissect_options *ndo,
                     const u_char *p, u_int length)
{
	struct mgmt_body_t pbody;
	int offset = 0;
	int ret;

	memset(&pbody, 0, sizeof(pbody));

	if (!ND_TTEST2(*p, IEEE802_11_CAPINFO_LEN + IEEE802_11_LISTENINT_LEN))
		return 0;
	if (length < IEEE802_11_CAPINFO_LEN + IEEE802_11_LISTENINT_LEN)
		return 0;
	pbody.capability_info = EXTRACT_LE_16BITS(p);
	offset += IEEE802_11_CAPINFO_LEN;
	length -= IEEE802_11_CAPINFO_LEN;
	pbody.listen_interval = EXTRACT_LE_16BITS(p+offset);
	offset += IEEE802_11_LISTENINT_LEN;
	length -= IEEE802_11_LISTENINT_LEN;

	ret = parse_elements(ndo, &pbody, p, offset, length);

	PRINT_SSID(pbody);
	PRINT_RATES(pbody);
	return ret;
}

static int
handle_assoc_response(netdissect_options *ndo,
                      const u_char *p, u_int length)
{
	struct mgmt_body_t pbody;
	int offset = 0;
	int ret;

	memset(&pbody, 0, sizeof(pbody));

	if (!ND_TTEST2(*p, IEEE802_11_CAPINFO_LEN + IEEE802_11_STATUS_LEN +
	    IEEE802_11_AID_LEN))
		return 0;
	if (length < IEEE802_11_CAPINFO_LEN + IEEE802_11_STATUS_LEN +
	    IEEE802_11_AID_LEN)
		return 0;
	pbody.capability_info = EXTRACT_LE_16BITS(p);
	offset += IEEE802_11_CAPINFO_LEN;
	length -= IEEE802_11_CAPINFO_LEN;
	pbody.status_code = EXTRACT_LE_16BITS(p+offset);
	offset += IEEE802_11_STATUS_LEN;
	length -= IEEE802_11_STATUS_LEN;
	pbody.aid = EXTRACT_LE_16BITS(p+offset);
	offset += IEEE802_11_AID_LEN;
	length -= IEEE802_11_AID_LEN;

	ret = parse_elements(ndo, &pbody, p, offset, length);

	ND_PRINT((ndo, " AID(%x) :%s: %s", ((uint16_t)(pbody.aid << 2 )) >> 2 ,
	    CAPABILITY_PRIVACY(pbody.capability_info) ? " PRIVACY " : "",
	    (pbody.status_code < NUM_STATUSES
		? status_text[pbody.status_code]
		: "n/a")));

	return ret;
}

static int
handle_reassoc_request(netdissect_options *ndo,
                       const u_char *p, u_int length)
{
	struct mgmt_body_t pbody;
	int offset = 0;
	int ret;

	memset(&pbody, 0, sizeof(pbody));

	if (!ND_TTEST2(*p, IEEE802_11_CAPINFO_LEN + IEEE802_11_LISTENINT_LEN +
	    IEEE802_11_AP_LEN))
		return 0;
	if (length < IEEE802_11_CAPINFO_LEN + IEEE802_11_LISTENINT_LEN +
	    IEEE802_11_AP_LEN)
		return 0;
	pbody.capability_info = EXTRACT_LE_16BITS(p);
	offset += IEEE802_11_CAPINFO_LEN;
	length -= IEEE802_11_CAPINFO_LEN;
	pbody.listen_interval = EXTRACT_LE_16BITS(p+offset);
	offset += IEEE802_11_LISTENINT_LEN;
	length -= IEEE802_11_LISTENINT_LEN;
	memcpy(&pbody.ap, p+offset, IEEE802_11_AP_LEN);
	offset += IEEE802_11_AP_LEN;
	length -= IEEE802_11_AP_LEN;

	ret = parse_elements(ndo, &pbody, p, offset, length);

	PRINT_SSID(pbody);
	ND_PRINT((ndo, " AP : %s", etheraddr_string(ndo,  pbody.ap )));

	return ret;
}

static int
handle_reassoc_response(netdissect_options *ndo,
                        const u_char *p, u_int length)
{
	/* Same as a Association Reponse */
	return handle_assoc_response(ndo, p, length);
}

static int
handle_probe_request(netdissect_options *ndo,
                     const u_char *p, u_int length)
{
	struct mgmt_body_t  pbody;
	int offset = 0;
	int ret;

	memset(&pbody, 0, sizeof(pbody));

	ret = parse_elements(ndo, &pbody, p, offset, length);

	PRINT_SSID(pbody);
	PRINT_RATES(pbody);

	return ret;
}

static int
handle_probe_response(netdissect_options *ndo,
                      const u_char *p, u_int length)
{
	struct mgmt_body_t  pbody;
	int offset = 0;
	int ret;

	memset(&pbody, 0, sizeof(pbody));

	if (!ND_TTEST2(*p, IEEE802_11_TSTAMP_LEN + IEEE802_11_BCNINT_LEN +
	    IEEE802_11_CAPINFO_LEN))
		return 0;
	if (length < IEEE802_11_TSTAMP_LEN + IEEE802_11_BCNINT_LEN +
	    IEEE802_11_CAPINFO_LEN)
		return 0;
	memcpy(&pbody.timestamp, p, IEEE802_11_TSTAMP_LEN);
	offset += IEEE802_11_TSTAMP_LEN;
	length -= IEEE802_11_TSTAMP_LEN;
	pbody.beacon_interval = EXTRACT_LE_16BITS(p+offset);
	offset += IEEE802_11_BCNINT_LEN;
	length -= IEEE802_11_BCNINT_LEN;
	pbody.capability_info = EXTRACT_LE_16BITS(p+offset);
	offset += IEEE802_11_CAPINFO_LEN;
	length -= IEEE802_11_CAPINFO_LEN;

	ret = parse_elements(ndo, &pbody, p, offset, length);

	PRINT_SSID(pbody);
	PRINT_RATES(pbody);
	PRINT_DS_CHANNEL(pbody);

	return ret;
}

static int
handle_atim(void)
{
	/* the frame body for ATIM is null. */
	return 1;
}

static int
handle_disassoc(netdissect_options *ndo,
                const u_char *p, u_int length)
{
	struct mgmt_body_t  pbody;

	memset(&pbody, 0, sizeof(pbody));

	if (!ND_TTEST2(*p, IEEE802_11_REASON_LEN))
		return 0;
	if (length < IEEE802_11_REASON_LEN)
		return 0;
	pbody.reason_code = EXTRACT_LE_16BITS(p);

	ND_PRINT((ndo, ": %s",
	    (pbody.reason_code < NUM_REASONS)
		? reason_text[pbody.reason_code]
		: "Reserved"));

	return 1;
}

static int
handle_auth(netdissect_options *ndo,
            const u_char *p, u_int length)
{
	struct mgmt_body_t  pbody;
	int offset = 0;
	int ret;

	memset(&pbody, 0, sizeof(pbody));

	if (!ND_TTEST2(*p, 6))
		return 0;
	if (length < 6)
		return 0;
	pbody.auth_alg = EXTRACT_LE_16BITS(p);
	offset += 2;
	length -= 2;
	pbody.auth_trans_seq_num = EXTRACT_LE_16BITS(p + offset);
	offset += 2;
	length -= 2;
	pbody.status_code = EXTRACT_LE_16BITS(p + offset);
	offset += 2;
	length -= 2;

	ret = parse_elements(ndo, &pbody, p, offset, length);

	if ((pbody.auth_alg == 1) &&
	    ((pbody.auth_trans_seq_num == 2) ||
	     (pbody.auth_trans_seq_num == 3))) {
		ND_PRINT((ndo, " (%s)-%x [Challenge Text] %s",
		    (pbody.auth_alg < NUM_AUTH_ALGS)
			? auth_alg_text[pbody.auth_alg]
			: "Reserved",
		    pbody.auth_trans_seq_num,
		    ((pbody.auth_trans_seq_num % 2)
		        ? ((pbody.status_code < NUM_STATUSES)
			       ? status_text[pbody.status_code]
			       : "n/a") : "")));
		return ret;
	}
	ND_PRINT((ndo, " (%s)-%x: %s",
	    (pbody.auth_alg < NUM_AUTH_ALGS)
		? auth_alg_text[pbody.auth_alg]
		: "Reserved",
	    pbody.auth_trans_seq_num,
	    (pbody.auth_trans_seq_num % 2)
	        ? ((pbody.status_code < NUM_STATUSES)
		    ? status_text[pbody.status_code]
	            : "n/a")
	        : ""));

	return ret;
}

static int
handle_deauth(netdissect_options *ndo,
              const uint8_t *src, const u_char *p, u_int length)
{
	struct mgmt_body_t  pbody;
	const char *reason = NULL;

	memset(&pbody, 0, sizeof(pbody));

	if (!ND_TTEST2(*p, IEEE802_11_REASON_LEN))
		return 0;
	if (length < IEEE802_11_REASON_LEN)
		return 0;
	pbody.reason_code = EXTRACT_LE_16BITS(p);

	reason = (pbody.reason_code < NUM_REASONS)
			? reason_text[pbody.reason_code]
			: "Reserved";

	if (ndo->ndo_eflag) {
		ND_PRINT((ndo, ": %s", reason));
	} else {
		ND_PRINT((ndo, " (%s): %s", etheraddr_string(ndo, src), reason));
	}
	return 1;
}

#define	PRINT_HT_ACTION(v) (\
	(v) == 0 ? ND_PRINT((ndo, "TxChWidth")) : \
	(v) == 1 ? ND_PRINT((ndo, "MIMOPwrSave")) : \
		   ND_PRINT((ndo, "Act#%d", (v))) \
)
#define	PRINT_BA_ACTION(v) (\
	(v) == 0 ? ND_PRINT((ndo, "ADDBA Request")) : \
	(v) == 1 ? ND_PRINT((ndo, "ADDBA Response")) : \
	(v) == 2 ? ND_PRINT((ndo, "DELBA")) : \
		   ND_PRINT((ndo, "Act#%d", (v))) \
)
#define	PRINT_MESHLINK_ACTION(v) (\
	(v) == 0 ? ND_PRINT((ndo, "Request")) : \
	(v) == 1 ? ND_PRINT((ndo, "Report")) : \
		   ND_PRINT((ndo, "Act#%d", (v))) \
)
#define	PRINT_MESHPEERING_ACTION(v) (\
	(v) == 0 ? ND_PRINT((ndo, "Open")) : \
	(v) == 1 ? ND_PRINT((ndo, "Confirm")) : \
	(v) == 2 ? ND_PRINT((ndo, "Close")) : \
		   ND_PRINT((ndo, "Act#%d", (v))) \
)
#define	PRINT_MESHPATH_ACTION(v) (\
	(v) == 0 ? ND_PRINT((ndo, "Request")) : \
	(v) == 1 ? ND_PRINT((ndo, "Report")) : \
	(v) == 2 ? ND_PRINT((ndo, "Error")) : \
	(v) == 3 ? ND_PRINT((ndo, "RootAnnouncement")) : \
		   ND_PRINT((ndo, "Act#%d", (v))) \
)

#define PRINT_MESH_ACTION(v) (\
	(v) == 0 ? ND_PRINT((ndo, "MeshLink")) : \
	(v) == 1 ? ND_PRINT((ndo, "HWMP")) : \
	(v) == 2 ? ND_PRINT((ndo, "Gate Announcement")) : \
	(v) == 3 ? ND_PRINT((ndo, "Congestion Control")) : \
	(v) == 4 ? ND_PRINT((ndo, "MCCA Setup Request")) : \
	(v) == 5 ? ND_PRINT((ndo, "MCCA Setup Reply")) : \
	(v) == 6 ? ND_PRINT((ndo, "MCCA Advertisement Request")) : \
	(v) == 7 ? ND_PRINT((ndo, "MCCA Advertisement")) : \
	(v) == 8 ? ND_PRINT((ndo, "MCCA Teardown")) : \
	(v) == 9 ? ND_PRINT((ndo, "TBTT Adjustment Request")) : \
	(v) == 10 ? ND_PRINT((ndo, "TBTT Adjustment Response")) : \
		   ND_PRINT((ndo, "Act#%d", (v))) \
)
#define PRINT_MULTIHOP_ACTION(v) (\
	(v) == 0 ? ND_PRINT((ndo, "Proxy Update")) : \
	(v) == 1 ? ND_PRINT((ndo, "Proxy Update Confirmation")) : \
		   ND_PRINT((ndo, "Act#%d", (v))) \
)
#define PRINT_SELFPROT_ACTION(v) (\
	(v) == 1 ? ND_PRINT((ndo, "Peering Open")) : \
	(v) == 2 ? ND_PRINT((ndo, "Peering Confirm")) : \
	(v) == 3 ? ND_PRINT((ndo, "Peering Close")) : \
	(v) == 4 ? ND_PRINT((ndo, "Group Key Inform")) : \
	(v) == 5 ? ND_PRINT((ndo, "Group Key Acknowledge")) : \
		   ND_PRINT((ndo, "Act#%d", (v))) \
)

static int
handle_action(netdissect_options *ndo,
              const uint8_t *src, const u_char *p, u_int length)
{
	if (!ND_TTEST2(*p, 2))
		return 0;
	if (length < 2)
		return 0;
	if (ndo->ndo_eflag) {
		ND_PRINT((ndo, ": "));
	} else {
		ND_PRINT((ndo, " (%s): ", etheraddr_string(ndo, src)));
	}
	switch (p[0]) {
	case 0: ND_PRINT((ndo, "Spectrum Management Act#%d", p[1])); break;
	case 1: ND_PRINT((ndo, "QoS Act#%d", p[1])); break;
	case 2: ND_PRINT((ndo, "DLS Act#%d", p[1])); break;
	case 3: ND_PRINT((ndo, "BA ")); PRINT_BA_ACTION(p[1]); break;
	case 7: ND_PRINT((ndo, "HT ")); PRINT_HT_ACTION(p[1]); break;
	case 13: ND_PRINT((ndo, "MeshAction ")); PRINT_MESH_ACTION(p[1]); break;
	case 14:
		ND_PRINT((ndo, "MultiohopAction "));
		PRINT_MULTIHOP_ACTION(p[1]); break;
	case 15:
		ND_PRINT((ndo, "SelfprotectAction "));
		PRINT_SELFPROT_ACTION(p[1]); break;
	case 127: ND_PRINT((ndo, "Vendor Act#%d", p[1])); break;
	default:
		ND_PRINT((ndo, "Reserved(%d) Act#%d", p[0], p[1]));
		break;
	}
	return 1;
}


/*********************************************************************************
 * Print Body funcs
 *********************************************************************************/


static int
mgmt_body_print(netdissect_options *ndo,
                uint16_t fc, const uint8_t *src, const u_char *p, u_int length)
{
	ND_PRINT((ndo, "%s", tok2str(st_str, "Unhandled Management subtype(%x)", FC_SUBTYPE(fc))));

	/* There may be a problem w/ AP not having this bit set */
	if (FC_PROTECTED(fc))
		return wep_print(ndo, p);
	switch (FC_SUBTYPE(fc)) {
	case ST_ASSOC_REQUEST:
		return handle_assoc_request(ndo, p, length);
	case ST_ASSOC_RESPONSE:
		return handle_assoc_response(ndo, p, length);
	case ST_REASSOC_REQUEST:
		return handle_reassoc_request(ndo, p, length);
	case ST_REASSOC_RESPONSE:
		return handle_reassoc_response(ndo, p, length);
	case ST_PROBE_REQUEST:
		return handle_probe_request(ndo, p, length);
	case ST_PROBE_RESPONSE:
		return handle_probe_response(ndo, p, length);
	case ST_BEACON:
		return handle_beacon(ndo, p, length);
	case ST_ATIM:
		return handle_atim();
	case ST_DISASSOC:
		return handle_disassoc(ndo, p, length);
	case ST_AUTH:
		return handle_auth(ndo, p, length);
	case ST_DEAUTH:
		return handle_deauth(ndo, src, p, length);
	case ST_ACTION:
		return handle_action(ndo, src, p, length);
	default:
		return 1;
	}
}


/*********************************************************************************
 * Handles printing all the control frame types
 *********************************************************************************/

static int
ctrl_body_print(netdissect_options *ndo,
                uint16_t fc, const u_char *p)
{
	ND_PRINT((ndo, "%s", tok2str(ctrl_str, "Unknown Ctrl Subtype", FC_SUBTYPE(fc))));
	switch (FC_SUBTYPE(fc)) {
	case CTRL_CONTROL_WRAPPER:
		/* XXX - requires special handling */
		break;
	case CTRL_BAR:
		if (!ND_TTEST2(*p, CTRL_BAR_HDRLEN))
			return 0;
		if (!ndo->ndo_eflag)
			ND_PRINT((ndo, " RA:%s TA:%s CTL(%x) SEQ(%u) ",
			    etheraddr_string(ndo, ((const struct ctrl_bar_hdr_t *)p)->ra),
			    etheraddr_string(ndo, ((const struct ctrl_bar_hdr_t *)p)->ta),
			    EXTRACT_LE_16BITS(&(((const struct ctrl_bar_hdr_t *)p)->ctl)),
			    EXTRACT_LE_16BITS(&(((const struct ctrl_bar_hdr_t *)p)->seq))));
		break;
	case CTRL_BA:
		if (!ND_TTEST2(*p, CTRL_BA_HDRLEN))
			return 0;
		if (!ndo->ndo_eflag)
			ND_PRINT((ndo, " RA:%s ",
			    etheraddr_string(ndo, ((const struct ctrl_ba_hdr_t *)p)->ra)));
		break;
	case CTRL_PS_POLL:
		if (!ND_TTEST2(*p, CTRL_PS_POLL_HDRLEN))
			return 0;
		ND_PRINT((ndo, " AID(%x)",
		    EXTRACT_LE_16BITS(&(((const struct ctrl_ps_poll_hdr_t *)p)->aid))));
		break;
	case CTRL_RTS:
		if (!ND_TTEST2(*p, CTRL_RTS_HDRLEN))
			return 0;
		if (!ndo->ndo_eflag)
			ND_PRINT((ndo, " TA:%s ",
			    etheraddr_string(ndo, ((const struct ctrl_rts_hdr_t *)p)->ta)));
		break;
	case CTRL_CTS:
		if (!ND_TTEST2(*p, CTRL_CTS_HDRLEN))
			return 0;
		if (!ndo->ndo_eflag)
			ND_PRINT((ndo, " RA:%s ",
			    etheraddr_string(ndo, ((const struct ctrl_cts_hdr_t *)p)->ra)));
		break;
	case CTRL_ACK:
		if (!ND_TTEST2(*p, CTRL_ACK_HDRLEN))
			return 0;
		if (!ndo->ndo_eflag)
			ND_PRINT((ndo, " RA:%s ",
			    etheraddr_string(ndo, ((const struct ctrl_ack_hdr_t *)p)->ra)));
		break;
	case CTRL_CF_END:
		if (!ND_TTEST2(*p, CTRL_END_HDRLEN))
			return 0;
		if (!ndo->ndo_eflag)
			ND_PRINT((ndo, " RA:%s ",
			    etheraddr_string(ndo, ((const struct ctrl_end_hdr_t *)p)->ra)));
		break;
	case CTRL_END_ACK:
		if (!ND_TTEST2(*p, CTRL_END_ACK_HDRLEN))
			return 0;
		if (!ndo->ndo_eflag)
			ND_PRINT((ndo, " RA:%s ",
			    etheraddr_string(ndo, ((const struct ctrl_end_ack_hdr_t *)p)->ra)));
		break;
	}
	return 1;
}

/*
 *  Data Frame - Address field contents
 *
 *  To Ds  | From DS | Addr 1 | Addr 2 | Addr 3 | Addr 4
 *    0    |  0      |  DA    | SA     | BSSID  | n/a
 *    0    |  1      |  DA    | BSSID  | SA     | n/a
 *    1    |  0      |  BSSID | SA     | DA     | n/a
 *    1    |  1      |  RA    | TA     | DA     | SA
 */

/*
 * Function to get source and destination MAC addresses for a data frame.
 */
static void
get_data_src_dst_mac(uint16_t fc, const u_char *p, const uint8_t **srcp,
                     const uint8_t **dstp)
{
#define ADDR1  (p + 4)
#define ADDR2  (p + 10)
#define ADDR3  (p + 16)
#define ADDR4  (p + 24)

	if (!FC_TO_DS(fc)) {
		if (!FC_FROM_DS(fc)) {
			/* not To DS and not From DS */
			*srcp = ADDR2;
			*dstp = ADDR1;
		} else {
			/* not To DS and From DS */
			*srcp = ADDR3;
			*dstp = ADDR1;
		}
	} else {
		if (!FC_FROM_DS(fc)) {
			/* From DS and not To DS */
			*srcp = ADDR2;
			*dstp = ADDR3;
		} else {
			/* To DS and From DS */
			*srcp = ADDR4;
			*dstp = ADDR3;
		}
	}

#undef ADDR1
#undef ADDR2
#undef ADDR3
#undef ADDR4
}

static void
get_mgmt_src_dst_mac(const u_char *p, const uint8_t **srcp, const uint8_t **dstp)
{
	const struct mgmt_header_t *hp = (const struct mgmt_header_t *) p;

	if (srcp != NULL)
		*srcp = hp->sa;
	if (dstp != NULL)
		*dstp = hp->da;
}

/*
 * Print Header funcs
 */

static void
data_header_print(netdissect_options *ndo, uint16_t fc, const u_char *p)
{
	u_int subtype = FC_SUBTYPE(fc);

	if (DATA_FRAME_IS_CF_ACK(subtype) || DATA_FRAME_IS_CF_POLL(subtype) ||
	    DATA_FRAME_IS_QOS(subtype)) {
		ND_PRINT((ndo, "CF "));
		if (DATA_FRAME_IS_CF_ACK(subtype)) {
			if (DATA_FRAME_IS_CF_POLL(subtype))
				ND_PRINT((ndo, "Ack/Poll"));
			else
				ND_PRINT((ndo, "Ack"));
		} else {
			if (DATA_FRAME_IS_CF_POLL(subtype))
				ND_PRINT((ndo, "Poll"));
		}
		if (DATA_FRAME_IS_QOS(subtype))
			ND_PRINT((ndo, "+QoS"));
		ND_PRINT((ndo, " "));
	}

#define ADDR1  (p + 4)
#define ADDR2  (p + 10)
#define ADDR3  (p + 16)
#define ADDR4  (p + 24)

	if (!FC_TO_DS(fc) && !FC_FROM_DS(fc)) {
		ND_PRINT((ndo, "DA:%s SA:%s BSSID:%s ",
		    etheraddr_string(ndo, ADDR1), etheraddr_string(ndo, ADDR2),
		    etheraddr_string(ndo, ADDR3)));
	} else if (!FC_TO_DS(fc) && FC_FROM_DS(fc)) {
		ND_PRINT((ndo, "DA:%s BSSID:%s SA:%s ",
		    etheraddr_string(ndo, ADDR1), etheraddr_string(ndo, ADDR2),
		    etheraddr_string(ndo, ADDR3)));
	} else if (FC_TO_DS(fc) && !FC_FROM_DS(fc)) {
		ND_PRINT((ndo, "BSSID:%s SA:%s DA:%s ",
		    etheraddr_string(ndo, ADDR1), etheraddr_string(ndo, ADDR2),
		    etheraddr_string(ndo, ADDR3)));
	} else if (FC_TO_DS(fc) && FC_FROM_DS(fc)) {
		ND_PRINT((ndo, "RA:%s TA:%s DA:%s SA:%s ",
		    etheraddr_string(ndo, ADDR1), etheraddr_string(ndo, ADDR2),
		    etheraddr_string(ndo, ADDR3), etheraddr_string(ndo, ADDR4)));
	}

#undef ADDR1
#undef ADDR2
#undef ADDR3
#undef ADDR4
}

static void
mgmt_header_print(netdissect_options *ndo, const u_char *p)
{
	const struct mgmt_header_t *hp = (const struct mgmt_header_t *) p;

	ND_PRINT((ndo, "BSSID:%s DA:%s SA:%s ",
	    etheraddr_string(ndo, (hp)->bssid), etheraddr_string(ndo, (hp)->da),
	    etheraddr_string(ndo, (hp)->sa)));
}

static void
ctrl_header_print(netdissect_options *ndo, uint16_t fc, const u_char *p)
{
	switch (FC_SUBTYPE(fc)) {
	case CTRL_BAR:
		ND_PRINT((ndo, " RA:%s TA:%s CTL(%x) SEQ(%u) ",
		    etheraddr_string(ndo, ((const struct ctrl_bar_hdr_t *)p)->ra),
		    etheraddr_string(ndo, ((const struct ctrl_bar_hdr_t *)p)->ta),
		    EXTRACT_LE_16BITS(&(((const struct ctrl_bar_hdr_t *)p)->ctl)),
		    EXTRACT_LE_16BITS(&(((const struct ctrl_bar_hdr_t *)p)->seq))));
		break;
	case CTRL_BA:
		ND_PRINT((ndo, "RA:%s ",
		    etheraddr_string(ndo, ((const struct ctrl_ba_hdr_t *)p)->ra)));
		break;
	case CTRL_PS_POLL:
		ND_PRINT((ndo, "BSSID:%s TA:%s ",
		    etheraddr_string(ndo, ((const struct ctrl_ps_poll_hdr_t *)p)->bssid),
		    etheraddr_string(ndo, ((const struct ctrl_ps_poll_hdr_t *)p)->ta)));
		break;
	case CTRL_RTS:
		ND_PRINT((ndo, "RA:%s TA:%s ",
		    etheraddr_string(ndo, ((const struct ctrl_rts_hdr_t *)p)->ra),
		    etheraddr_string(ndo, ((const struct ctrl_rts_hdr_t *)p)->ta)));
		break;
	case CTRL_CTS:
		ND_PRINT((ndo, "RA:%s ",
		    etheraddr_string(ndo, ((const struct ctrl_cts_hdr_t *)p)->ra)));
		break;
	case CTRL_ACK:
		ND_PRINT((ndo, "RA:%s ",
		    etheraddr_string(ndo, ((const struct ctrl_ack_hdr_t *)p)->ra)));
		break;
	case CTRL_CF_END:
		ND_PRINT((ndo, "RA:%s BSSID:%s ",
		    etheraddr_string(ndo, ((const struct ctrl_end_hdr_t *)p)->ra),
		    etheraddr_string(ndo, ((const struct ctrl_end_hdr_t *)p)->bssid)));
		break;
	case CTRL_END_ACK:
		ND_PRINT((ndo, "RA:%s BSSID:%s ",
		    etheraddr_string(ndo, ((const struct ctrl_end_ack_hdr_t *)p)->ra),
		    etheraddr_string(ndo, ((const struct ctrl_end_ack_hdr_t *)p)->bssid)));
		break;
	default:
		/* We shouldn't get here - we should already have quit */
		break;
	}
}

static int
extract_header_length(netdissect_options *ndo,
                      uint16_t fc)
{
	int len;

	switch (FC_TYPE(fc)) {
	case T_MGMT:
		return MGMT_HDRLEN;
	case T_CTRL:
		switch (FC_SUBTYPE(fc)) {
		case CTRL_CONTROL_WRAPPER:
			return CTRL_CONTROL_WRAPPER_HDRLEN;
		case CTRL_BAR:
			return CTRL_BAR_HDRLEN;
		case CTRL_BA:
			return CTRL_BA_HDRLEN;
		case CTRL_PS_POLL:
			return CTRL_PS_POLL_HDRLEN;
		case CTRL_RTS:
			return CTRL_RTS_HDRLEN;
		case CTRL_CTS:
			return CTRL_CTS_HDRLEN;
		case CTRL_ACK:
			return CTRL_ACK_HDRLEN;
		case CTRL_CF_END:
			return CTRL_END_HDRLEN;
		case CTRL_END_ACK:
			return CTRL_END_ACK_HDRLEN;
		default:
			ND_PRINT((ndo, "unknown 802.11 ctrl frame subtype (%d)", FC_SUBTYPE(fc)));
			return 0;
		}
	case T_DATA:
		len = (FC_TO_DS(fc) && FC_FROM_DS(fc)) ? 30 : 24;
		if (DATA_FRAME_IS_QOS(FC_SUBTYPE(fc)))
			len += 2;
		return len;
	default:
		ND_PRINT((ndo, "unknown 802.11 frame type (%d)", FC_TYPE(fc)));
		return 0;
	}
}

static int
extract_mesh_header_length(const u_char *p)
{
	return (p[0] &~ 3) ? 0 : 6*(1 + (p[0] & 3));
}

/*
 * Print the 802.11 MAC header.
 */
static void
ieee_802_11_hdr_print(netdissect_options *ndo,
                      uint16_t fc, const u_char *p, u_int hdrlen,
                      u_int meshdrlen)
{
	if (ndo->ndo_vflag) {
		if (FC_MORE_DATA(fc))
			ND_PRINT((ndo, "More Data "));
		if (FC_MORE_FLAG(fc))
			ND_PRINT((ndo, "More Fragments "));
		if (FC_POWER_MGMT(fc))
			ND_PRINT((ndo, "Pwr Mgmt "));
		if (FC_RETRY(fc))
			ND_PRINT((ndo, "Retry "));
		if (FC_ORDER(fc))
			ND_PRINT((ndo, "Strictly Ordered "));
		if (FC_PROTECTED(fc))
			ND_PRINT((ndo, "Protected "));
		if (FC_TYPE(fc) != T_CTRL || FC_SUBTYPE(fc) != CTRL_PS_POLL)
			ND_PRINT((ndo, "%dus ",
			    EXTRACT_LE_16BITS(
			        &((const struct mgmt_header_t *)p)->duration)));
	}
	if (meshdrlen != 0) {
		const struct meshcntl_t *mc =
		    (const struct meshcntl_t *)&p[hdrlen - meshdrlen];
		int ae = mc->flags & 3;

		ND_PRINT((ndo, "MeshData (AE %d TTL %u seq %u", ae, mc->ttl,
		    EXTRACT_LE_32BITS(mc->seq)));
		if (ae > 0)
			ND_PRINT((ndo, " A4:%s", etheraddr_string(ndo, mc->addr4)));
		if (ae > 1)
			ND_PRINT((ndo, " A5:%s", etheraddr_string(ndo, mc->addr5)));
		if (ae > 2)
			ND_PRINT((ndo, " A6:%s", etheraddr_string(ndo, mc->addr6)));
		ND_PRINT((ndo, ") "));
	}

	switch (FC_TYPE(fc)) {
	case T_MGMT:
		mgmt_header_print(ndo, p);
		break;
	case T_CTRL:
		ctrl_header_print(ndo, fc, p);
		break;
	case T_DATA:
		data_header_print(ndo, fc, p);
		break;
	default:
		break;
	}
}

#ifndef roundup2
#define	roundup2(x, y)	(((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */
#endif

static const char tstr[] = "[|802.11]";

static u_int
ieee802_11_print(netdissect_options *ndo,
                 const u_char *p, u_int length, u_int orig_caplen, int pad,
                 u_int fcslen)
{
	uint16_t fc;
	u_int caplen, hdrlen, meshdrlen;
	struct lladdr_info src, dst;
	int llc_hdrlen;

	caplen = orig_caplen;
	/* Remove FCS, if present */
	if (length < fcslen) {
		ND_PRINT((ndo, "%s", tstr));
		return caplen;
	}
	length -= fcslen;
	if (caplen > length) {
		/* Amount of FCS in actual packet data, if any */
		fcslen = caplen - length;
		caplen -= fcslen;
		ndo->ndo_snapend -= fcslen;
	}

	if (caplen < IEEE802_11_FC_LEN) {
		ND_PRINT((ndo, "%s", tstr));
		return orig_caplen;
	}

	fc = EXTRACT_LE_16BITS(p);
	hdrlen = extract_header_length(ndo, fc);
	if (hdrlen == 0) {
		/* Unknown frame type or control frame subtype; quit. */
		return (0);
	}
	if (pad)
		hdrlen = roundup2(hdrlen, 4);
	if (ndo->ndo_Hflag && FC_TYPE(fc) == T_DATA &&
	    DATA_FRAME_IS_QOS(FC_SUBTYPE(fc))) {
		meshdrlen = extract_mesh_header_length(p+hdrlen);
		hdrlen += meshdrlen;
	} else
		meshdrlen = 0;

	if (caplen < hdrlen) {
		ND_PRINT((ndo, "%s", tstr));
		return hdrlen;
	}

	if (ndo->ndo_eflag)
		ieee_802_11_hdr_print(ndo, fc, p, hdrlen, meshdrlen);

	/*
	 * Go past the 802.11 header.
	 */
	length -= hdrlen;
	caplen -= hdrlen;
	p += hdrlen;

	src.addr_string = etheraddr_string;
	dst.addr_string = etheraddr_string;
	switch (FC_TYPE(fc)) {
	case T_MGMT:
		get_mgmt_src_dst_mac(p - hdrlen, &src.addr, &dst.addr);
		if (!mgmt_body_print(ndo, fc, src.addr, p, length)) {
			ND_PRINT((ndo, "%s", tstr));
			return hdrlen;
		}
		break;
	case T_CTRL:
		if (!ctrl_body_print(ndo, fc, p - hdrlen)) {
			ND_PRINT((ndo, "%s", tstr));
			return hdrlen;
		}
		break;
	case T_DATA:
		if (DATA_FRAME_IS_NULL(FC_SUBTYPE(fc)))
			return hdrlen;	/* no-data frame */
		/* There may be a problem w/ AP not having this bit set */
		if (FC_PROTECTED(fc)) {
			ND_PRINT((ndo, "Data"));
			if (!wep_print(ndo, p)) {
				ND_PRINT((ndo, "%s", tstr));
				return hdrlen;
			}
		} else {
			get_data_src_dst_mac(fc, p - hdrlen, &src.addr, &dst.addr);
			llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst);
			if (llc_hdrlen < 0) {
				/*
				 * Some kinds of LLC packet we cannot
				 * handle intelligently
				 */
				if (!ndo->ndo_suppress_default_print)
					ND_DEFAULTPRINT(p, caplen);
				llc_hdrlen = -llc_hdrlen;
			}
			hdrlen += llc_hdrlen;
		}
		break;
	default:
		/* We shouldn't get here - we should already have quit */
		break;
	}

	return hdrlen;
}

/*
 * This is the top level routine of the printer.  'p' points
 * to the 802.11 header of the packet, 'h->ts' is the timestamp,
 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 * is the number of bytes actually captured.
 */
u_int
ieee802_11_if_print(netdissect_options *ndo,
                    const struct pcap_pkthdr *h, const u_char *p)
{
	return ieee802_11_print(ndo, p, h->len, h->caplen, 0, 0);
}


/* $FreeBSD: stable/11/contrib/tcpdump/print-802_11.c 276788 2015-01-07 19:55:18Z delphij $ */
/* NetBSD: ieee802_11_radio.h,v 1.2 2006/02/26 03:04:03 dyoung Exp  */

/*-
 * Copyright (c) 2003, 2004 David Young.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of David Young may not be used to endorse or promote
 *    products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY DAVID YOUNG ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL DAVID
 * YOUNG BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 */

/* A generic radio capture format is desirable. It must be
 * rigidly defined (e.g., units for fields should be given),
 * and easily extensible.
 *
 * The following is an extensible radio capture format. It is
 * based on a bitmap indicating which fields are present.
 *
 * I am trying to describe precisely what the application programmer
 * should expect in the following, and for that reason I tell the
 * units and origin of each measurement (where it applies), or else I
 * use sufficiently weaselly language ("is a monotonically nondecreasing
 * function of...") that I cannot set false expectations for lawyerly
 * readers.
 */

/*
 * The radio capture header precedes the 802.11 header.
 *
 * Note well: all radiotap fields are little-endian.
 */
struct ieee80211_radiotap_header {
	uint8_t		it_version;	/* Version 0. Only increases
					 * for drastic changes,
					 * introduction of compatible
					 * new fields does not count.
					 */
	uint8_t		it_pad;
	uint16_t	it_len;		/* length of the whole
					 * header in bytes, including
					 * it_version, it_pad,
					 * it_len, and data fields.
					 */
	uint32_t	it_present;	/* A bitmap telling which
					 * fields are present. Set bit 31
					 * (0x80000000) to extend the
					 * bitmap by another 32 bits.
					 * Additional extensions are made
					 * by setting bit 31.
					 */
};

/* Name                                 Data type       Units
 * ----                                 ---------       -----
 *
 * IEEE80211_RADIOTAP_TSFT              uint64_t       microseconds
 *
 *      Value in microseconds of the MAC's 64-bit 802.11 Time
 *      Synchronization Function timer when the first bit of the
 *      MPDU arrived at the MAC. For received frames, only.
 *
 * IEEE80211_RADIOTAP_CHANNEL           2 x uint16_t   MHz, bitmap
 *
 *      Tx/Rx frequency in MHz, followed by flags (see below).
 *	Note that IEEE80211_RADIOTAP_XCHANNEL must be used to
 *	represent an HT channel as there is not enough room in
 *	the flags word.
 *
 * IEEE80211_RADIOTAP_FHSS              uint16_t       see below
 *
 *      For frequency-hopping radios, the hop set (first byte)
 *      and pattern (second byte).
 *
 * IEEE80211_RADIOTAP_RATE              uint8_t        500kb/s or index
 *
 *      Tx/Rx data rate.  If bit 0x80 is set then it represents an
 *	an MCS index and not an IEEE rate.
 *
 * IEEE80211_RADIOTAP_DBM_ANTSIGNAL     int8_t          decibels from
 *                                                      one milliwatt (dBm)
 *
 *      RF signal power at the antenna, decibel difference from
 *      one milliwatt.
 *
 * IEEE80211_RADIOTAP_DBM_ANTNOISE      int8_t          decibels from
 *                                                      one milliwatt (dBm)
 *
 *      RF noise power at the antenna, decibel difference from one
 *      milliwatt.
 *
 * IEEE80211_RADIOTAP_DB_ANTSIGNAL      uint8_t        decibel (dB)
 *
 *      RF signal power at the antenna, decibel difference from an
 *      arbitrary, fixed reference.
 *
 * IEEE80211_RADIOTAP_DB_ANTNOISE       uint8_t        decibel (dB)
 *
 *      RF noise power at the antenna, decibel difference from an
 *      arbitrary, fixed reference point.
 *
 * IEEE80211_RADIOTAP_LOCK_QUALITY      uint16_t       unitless
 *
 *      Quality of Barker code lock. Unitless. Monotonically
 *      nondecreasing with "better" lock strength. Called "Signal
 *      Quality" in datasheets.  (Is there a standard way to measure
 *      this?)
 *
 * IEEE80211_RADIOTAP_TX_ATTENUATION    uint16_t       unitless
 *
 *      Transmit power expressed as unitless distance from max
 *      power set at factory calibration.  0 is max power.
 *      Monotonically nondecreasing with lower power levels.
 *
 * IEEE80211_RADIOTAP_DB_TX_ATTENUATION uint16_t       decibels (dB)
 *
 *      Transmit power expressed as decibel distance from max power
 *      set at factory calibration.  0 is max power.  Monotonically
 *      nondecreasing with lower power levels.
 *
 * IEEE80211_RADIOTAP_DBM_TX_POWER      int8_t          decibels from
 *                                                      one milliwatt (dBm)
 *
 *      Transmit power expressed as dBm (decibels from a 1 milliwatt
 *      reference). This is the absolute power level measured at
 *      the antenna port.
 *
 * IEEE80211_RADIOTAP_FLAGS             uint8_t        bitmap
 *
 *      Properties of transmitted and received frames. See flags
 *      defined below.
 *
 * IEEE80211_RADIOTAP_ANTENNA           uint8_t        antenna index
 *
 *      Unitless indication of the Rx/Tx antenna for this packet.
 *      The first antenna is antenna 0.
 *
 * IEEE80211_RADIOTAP_RX_FLAGS          uint16_t       bitmap
 *
 *     Properties of received frames. See flags defined below.
 *
 * IEEE80211_RADIOTAP_XCHANNEL          uint32_t	bitmap
 *					uint16_t	MHz
 *					uint8_t		channel number
 *					uint8_t		.5 dBm
 *
 *	Extended channel specification: flags (see below) followed by
 *	frequency in MHz, the corresponding IEEE channel number, and
 *	finally the maximum regulatory transmit power cap in .5 dBm
 *	units.  This property supersedes IEEE80211_RADIOTAP_CHANNEL
 *	and only one of the two should be present.
 *
 * IEEE80211_RADIOTAP_MCS		uint8_t		known
 *					uint8_t		flags
 *					uint8_t		mcs
 *
 *	Bitset indicating which fields have known values, followed
 *	by bitset of flag values, followed by the MCS rate index as
 *	in IEEE 802.11n.
 *
 *
 * IEEE80211_RADIOTAP_AMPDU_STATUS	u32, u16, u8, u8	unitless
 *
 *	Contains the AMPDU information for the subframe.
 *
 * IEEE80211_RADIOTAP_VHT	u16, u8, u8, u8[4], u8, u8, u16
 *
 *	Contains VHT information about this frame.
 *
 * IEEE80211_RADIOTAP_VENDOR_NAMESPACE
 *					uint8_t  OUI[3]
 *                                   uint8_t  subspace
 *                                   uint16_t length
 *
 *     The Vendor Namespace Field contains three sub-fields. The first
 *     sub-field is 3 bytes long. It contains the vendor's IEEE 802
 *     Organizationally Unique Identifier (OUI). The fourth byte is a
 *     vendor-specific "namespace selector."
 *
 */
enum ieee80211_radiotap_type {
	IEEE80211_RADIOTAP_TSFT = 0,
	IEEE80211_RADIOTAP_FLAGS = 1,
	IEEE80211_RADIOTAP_RATE = 2,
	IEEE80211_RADIOTAP_CHANNEL = 3,
	IEEE80211_RADIOTAP_FHSS = 4,
	IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5,
	IEEE80211_RADIOTAP_DBM_ANTNOISE = 6,
	IEEE80211_RADIOTAP_LOCK_QUALITY = 7,
	IEEE80211_RADIOTAP_TX_ATTENUATION = 8,
	IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9,
	IEEE80211_RADIOTAP_DBM_TX_POWER = 10,
	IEEE80211_RADIOTAP_ANTENNA = 11,
	IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12,
	IEEE80211_RADIOTAP_DB_ANTNOISE = 13,
	IEEE80211_RADIOTAP_RX_FLAGS = 14,
	/* NB: gap for netbsd definitions */
	IEEE80211_RADIOTAP_XCHANNEL = 18,
	IEEE80211_RADIOTAP_MCS = 19,
	IEEE80211_RADIOTAP_AMPDU_STATUS = 20,
	IEEE80211_RADIOTAP_VHT = 21,
	IEEE80211_RADIOTAP_NAMESPACE = 29,
	IEEE80211_RADIOTAP_VENDOR_NAMESPACE = 30,
	IEEE80211_RADIOTAP_EXT = 31
};

/* channel attributes */
#define	IEEE80211_CHAN_TURBO	0x00010	/* Turbo channel */
#define	IEEE80211_CHAN_CCK	0x00020	/* CCK channel */
#define	IEEE80211_CHAN_OFDM	0x00040	/* OFDM channel */
#define	IEEE80211_CHAN_2GHZ	0x00080	/* 2 GHz spectrum channel. */
#define	IEEE80211_CHAN_5GHZ	0x00100	/* 5 GHz spectrum channel */
#define	IEEE80211_CHAN_PASSIVE	0x00200	/* Only passive scan allowed */
#define	IEEE80211_CHAN_DYN	0x00400	/* Dynamic CCK-OFDM channel */
#define	IEEE80211_CHAN_GFSK	0x00800	/* GFSK channel (FHSS PHY) */
#define	IEEE80211_CHAN_GSM	0x01000	/* 900 MHz spectrum channel */
#define	IEEE80211_CHAN_STURBO	0x02000	/* 11a static turbo channel only */
#define	IEEE80211_CHAN_HALF	0x04000	/* Half rate channel */
#define	IEEE80211_CHAN_QUARTER	0x08000	/* Quarter rate channel */
#define	IEEE80211_CHAN_HT20	0x10000	/* HT 20 channel */
#define	IEEE80211_CHAN_HT40U	0x20000	/* HT 40 channel w/ ext above */
#define	IEEE80211_CHAN_HT40D	0x40000	/* HT 40 channel w/ ext below */

/* Useful combinations of channel characteristics, borrowed from Ethereal */
#define IEEE80211_CHAN_A \
        (IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_OFDM)
#define IEEE80211_CHAN_B \
        (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_CCK)
#define IEEE80211_CHAN_G \
        (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_DYN)
#define IEEE80211_CHAN_TA \
        (IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_OFDM | IEEE80211_CHAN_TURBO)
#define IEEE80211_CHAN_TG \
        (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_DYN  | IEEE80211_CHAN_TURBO)


/* For IEEE80211_RADIOTAP_FLAGS */
#define	IEEE80211_RADIOTAP_F_CFP	0x01	/* sent/received
						 * during CFP
						 */
#define	IEEE80211_RADIOTAP_F_SHORTPRE	0x02	/* sent/received
						 * with short
						 * preamble
						 */
#define	IEEE80211_RADIOTAP_F_WEP	0x04	/* sent/received
						 * with WEP encryption
						 */
#define	IEEE80211_RADIOTAP_F_FRAG	0x08	/* sent/received
						 * with fragmentation
						 */
#define	IEEE80211_RADIOTAP_F_FCS	0x10	/* frame includes FCS */
#define	IEEE80211_RADIOTAP_F_DATAPAD	0x20	/* frame has padding between
						 * 802.11 header and payload
						 * (to 32-bit boundary)
						 */
#define	IEEE80211_RADIOTAP_F_BADFCS	0x40	/* does not pass FCS check */

/* For IEEE80211_RADIOTAP_RX_FLAGS */
#define IEEE80211_RADIOTAP_F_RX_BADFCS	0x0001	/* frame failed crc check */
#define IEEE80211_RADIOTAP_F_RX_PLCP_CRC	0x0002	/* frame failed PLCP CRC check */

/* For IEEE80211_RADIOTAP_MCS known */
#define IEEE80211_RADIOTAP_MCS_BANDWIDTH_KNOWN		0x01
#define IEEE80211_RADIOTAP_MCS_MCS_INDEX_KNOWN		0x02	/* MCS index field */
#define IEEE80211_RADIOTAP_MCS_GUARD_INTERVAL_KNOWN	0x04
#define IEEE80211_RADIOTAP_MCS_HT_FORMAT_KNOWN		0x08
#define IEEE80211_RADIOTAP_MCS_FEC_TYPE_KNOWN		0x10
#define IEEE80211_RADIOTAP_MCS_STBC_KNOWN		0x20
#define IEEE80211_RADIOTAP_MCS_NESS_KNOWN		0x40
#define IEEE80211_RADIOTAP_MCS_NESS_BIT_1		0x80

/* For IEEE80211_RADIOTAP_MCS flags */
#define IEEE80211_RADIOTAP_MCS_BANDWIDTH_MASK	0x03
#define IEEE80211_RADIOTAP_MCS_BANDWIDTH_20	0
#define IEEE80211_RADIOTAP_MCS_BANDWIDTH_40	1
#define IEEE80211_RADIOTAP_MCS_BANDWIDTH_20L	2
#define IEEE80211_RADIOTAP_MCS_BANDWIDTH_20U	3
#define IEEE80211_RADIOTAP_MCS_SHORT_GI		0x04 /* short guard interval */
#define IEEE80211_RADIOTAP_MCS_HT_GREENFIELD	0x08
#define IEEE80211_RADIOTAP_MCS_FEC_LDPC		0x10
#define IEEE80211_RADIOTAP_MCS_STBC_MASK	0x60
#define		IEEE80211_RADIOTAP_MCS_STBC_1	1
#define		IEEE80211_RADIOTAP_MCS_STBC_2	2
#define		IEEE80211_RADIOTAP_MCS_STBC_3	3
#define IEEE80211_RADIOTAP_MCS_STBC_SHIFT	5
#define IEEE80211_RADIOTAP_MCS_NESS_BIT_0	0x80

/* For IEEE80211_RADIOTAP_AMPDU_STATUS */
#define IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN		0x0001
#define IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN		0x0002
#define IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN		0x0004
#define IEEE80211_RADIOTAP_AMPDU_IS_LAST		0x0008
#define IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR		0x0010
#define IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN	0x0020

/* For IEEE80211_RADIOTAP_VHT known */
#define IEEE80211_RADIOTAP_VHT_STBC_KNOWN			0x0001
#define IEEE80211_RADIOTAP_VHT_TXOP_PS_NA_KNOWN			0x0002
#define IEEE80211_RADIOTAP_VHT_GUARD_INTERVAL_KNOWN		0x0004
#define IEEE80211_RADIOTAP_VHT_SGI_NSYM_DIS_KNOWN		0x0008
#define IEEE80211_RADIOTAP_VHT_LDPC_EXTRA_OFDM_SYM_KNOWN	0x0010
#define IEEE80211_RADIOTAP_VHT_BEAMFORMED_KNOWN			0x0020
#define IEEE80211_RADIOTAP_VHT_BANDWIDTH_KNOWN			0x0040
#define IEEE80211_RADIOTAP_VHT_GROUP_ID_KNOWN			0x0080
#define IEEE80211_RADIOTAP_VHT_PARTIAL_AID_KNOWN		0x0100

/* For IEEE80211_RADIOTAP_VHT flags */
#define IEEE80211_RADIOTAP_VHT_STBC			0x01
#define IEEE80211_RADIOTAP_VHT_TXOP_PS_NA		0x02
#define IEEE80211_RADIOTAP_VHT_SHORT_GI			0x04
#define IEEE80211_RADIOTAP_VHT_SGI_NSYM_M10_9		0x08
#define IEEE80211_RADIOTAP_VHT_LDPC_EXTRA_OFDM_SYM	0x10
#define IEEE80211_RADIOTAP_VHT_BEAMFORMED		0x20

#define IEEE80211_RADIOTAP_VHT_BANDWIDTH_MASK	0x1f

#define IEEE80211_RADIOTAP_VHT_NSS_MASK		0x0f
#define IEEE80211_RADIOTAP_VHT_MCS_MASK		0xf0
#define IEEE80211_RADIOTAP_VHT_MCS_SHIFT	4

#define IEEE80211_RADIOTAP_CODING_LDPC_USERn			0x01

#define	IEEE80211_CHAN_FHSS \
	(IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_GFSK)
#define	IEEE80211_CHAN_A \
	(IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_OFDM)
#define	IEEE80211_CHAN_B \
	(IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_CCK)
#define	IEEE80211_CHAN_PUREG \
	(IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_OFDM)
#define	IEEE80211_CHAN_G \
	(IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_DYN)

#define	IS_CHAN_FHSS(flags) \
	((flags & IEEE80211_CHAN_FHSS) == IEEE80211_CHAN_FHSS)
#define	IS_CHAN_A(flags) \
	((flags & IEEE80211_CHAN_A) == IEEE80211_CHAN_A)
#define	IS_CHAN_B(flags) \
	((flags & IEEE80211_CHAN_B) == IEEE80211_CHAN_B)
#define	IS_CHAN_PUREG(flags) \
	((flags & IEEE80211_CHAN_PUREG) == IEEE80211_CHAN_PUREG)
#define	IS_CHAN_G(flags) \
	((flags & IEEE80211_CHAN_G) == IEEE80211_CHAN_G)
#define	IS_CHAN_ANYG(flags) \
	(IS_CHAN_PUREG(flags) || IS_CHAN_G(flags))

static void
print_chaninfo(netdissect_options *ndo,
               uint16_t freq, int flags, int presentflags)
{
	ND_PRINT((ndo, "%u MHz", freq));
	if (presentflags & (1 << IEEE80211_RADIOTAP_MCS)) {
		/*
		 * We have the MCS field, so this is 11n, regardless
		 * of what the channel flags say.
		 */
		ND_PRINT((ndo, " 11n"));
	} else {
		if (IS_CHAN_FHSS(flags))
			ND_PRINT((ndo, " FHSS"));
		if (IS_CHAN_A(flags)) {
			if (flags & IEEE80211_CHAN_HALF)
				ND_PRINT((ndo, " 11a/10Mhz"));
			else if (flags & IEEE80211_CHAN_QUARTER)
				ND_PRINT((ndo, " 11a/5Mhz"));
			else
				ND_PRINT((ndo, " 11a"));
		}
		if (IS_CHAN_ANYG(flags)) {
			if (flags & IEEE80211_CHAN_HALF)
				ND_PRINT((ndo, " 11g/10Mhz"));
			else if (flags & IEEE80211_CHAN_QUARTER)
				ND_PRINT((ndo, " 11g/5Mhz"));
			else
				ND_PRINT((ndo, " 11g"));
		} else if (IS_CHAN_B(flags))
			ND_PRINT((ndo, " 11b"));
		if (flags & IEEE80211_CHAN_TURBO)
			ND_PRINT((ndo, " Turbo"));
	}
	/*
	 * These apply to 11n.
	 */
	if (flags & IEEE80211_CHAN_HT20)
		ND_PRINT((ndo, " ht/20"));
	else if (flags & IEEE80211_CHAN_HT40D)
		ND_PRINT((ndo, " ht/40-"));
	else if (flags & IEEE80211_CHAN_HT40U)
		ND_PRINT((ndo, " ht/40+"));
	ND_PRINT((ndo, " "));
}

static int
print_radiotap_field(netdissect_options *ndo,
                     struct cpack_state *s, uint32_t bit, uint8_t *flagsp,
                     uint32_t presentflags)
{
	u_int i;
	int rc;

	switch (bit) {

	case IEEE80211_RADIOTAP_TSFT: {
		uint64_t tsft;

		rc = cpack_uint64(s, &tsft);
		if (rc != 0)
			goto trunc;
		ND_PRINT((ndo, "%" PRIu64 "us tsft ", tsft));
		break;
		}

	case IEEE80211_RADIOTAP_FLAGS: {
		uint8_t flagsval;

		rc = cpack_uint8(s, &flagsval);
		if (rc != 0)
			goto trunc;
		*flagsp = flagsval;
		if (flagsval & IEEE80211_RADIOTAP_F_CFP)
			ND_PRINT((ndo, "cfp "));
		if (flagsval & IEEE80211_RADIOTAP_F_SHORTPRE)
			ND_PRINT((ndo, "short preamble "));
		if (flagsval & IEEE80211_RADIOTAP_F_WEP)
			ND_PRINT((ndo, "wep "));
		if (flagsval & IEEE80211_RADIOTAP_F_FRAG)
			ND_PRINT((ndo, "fragmented "));
		if (flagsval & IEEE80211_RADIOTAP_F_BADFCS)
			ND_PRINT((ndo, "bad-fcs "));
		break;
		}

	case IEEE80211_RADIOTAP_RATE: {
		uint8_t rate;

		rc = cpack_uint8(s, &rate);
		if (rc != 0)
			goto trunc;
		/*
		 * XXX On FreeBSD rate & 0x80 means we have an MCS. On
		 * Linux and AirPcap it does not.  (What about
		 * Mac OS X, NetBSD, OpenBSD, and DragonFly BSD?)
		 *
		 * This is an issue either for proprietary extensions
		 * to 11a or 11g, which do exist, or for 11n
		 * implementations that stuff a rate value into
		 * this field, which also appear to exist.
		 *
		 * We currently handle that by assuming that
		 * if the 0x80 bit is set *and* the remaining
		 * bits have a value between 0 and 15 it's
		 * an MCS value, otherwise it's a rate.  If
		 * there are cases where systems that use
		 * "0x80 + MCS index" for MCS indices > 15,
		 * or stuff a rate value here between 64 and
		 * 71.5 Mb/s in here, we'll need a preference
		 * setting.  Such rates do exist, e.g. 11n
		 * MCS 7 at 20 MHz with a long guard interval.
		 */
		if (rate >= 0x80 && rate <= 0x8f) {
			/*
			 * XXX - we don't know the channel width
			 * or guard interval length, so we can't
			 * convert this to a data rate.
			 *
			 * If you want us to show a data rate,
			 * use the MCS field, not the Rate field;
			 * the MCS field includes not only the
			 * MCS index, it also includes bandwidth
			 * and guard interval information.
			 *
			 * XXX - can we get the channel width
			 * from XChannel and the guard interval
			 * information from Flags, at least on
			 * FreeBSD?
			 */
			ND_PRINT((ndo, "MCS %u ", rate & 0x7f));
		} else
			ND_PRINT((ndo, "%2.1f Mb/s ", .5 * rate));
		break;
		}

	case IEEE80211_RADIOTAP_CHANNEL: {
		uint16_t frequency;
		uint16_t flags;

		rc = cpack_uint16(s, &frequency);
		if (rc != 0)
			goto trunc;
		rc = cpack_uint16(s, &flags);
		if (rc != 0)
			goto trunc;
		/*
		 * If CHANNEL and XCHANNEL are both present, skip
		 * CHANNEL.
		 */
		if (presentflags & (1 << IEEE80211_RADIOTAP_XCHANNEL))
			break;
		print_chaninfo(ndo, frequency, flags, presentflags);
		break;
		}

	case IEEE80211_RADIOTAP_FHSS: {
		uint8_t hopset;
		uint8_t hoppat;

		rc = cpack_uint8(s, &hopset);
		if (rc != 0)
			goto trunc;
		rc = cpack_uint8(s, &hoppat);
		if (rc != 0)
			goto trunc;
		ND_PRINT((ndo, "fhset %d fhpat %d ", hopset, hoppat));
		break;
		}

	case IEEE80211_RADIOTAP_DBM_ANTSIGNAL: {
		int8_t dbm_antsignal;

		rc = cpack_int8(s, &dbm_antsignal);
		if (rc != 0)
			goto trunc;
		ND_PRINT((ndo, "%ddBm signal ", dbm_antsignal));
		break;
		}

	case IEEE80211_RADIOTAP_DBM_ANTNOISE: {
		int8_t dbm_antnoise;

		rc = cpack_int8(s, &dbm_antnoise);
		if (rc != 0)
			goto trunc;
		ND_PRINT((ndo, "%ddBm noise ", dbm_antnoise));
		break;
		}

	case IEEE80211_RADIOTAP_LOCK_QUALITY: {
		uint16_t lock_quality;

		rc = cpack_uint16(s, &lock_quality);
		if (rc != 0)
			goto trunc;
		ND_PRINT((ndo, "%u sq ", lock_quality));
		break;
		}

	case IEEE80211_RADIOTAP_TX_ATTENUATION: {
		uint16_t tx_attenuation;

		rc = cpack_uint16(s, &tx_attenuation);
		if (rc != 0)
			goto trunc;
		ND_PRINT((ndo, "%d tx power ", -(int)tx_attenuation));
		break;
		}

	case IEEE80211_RADIOTAP_DB_TX_ATTENUATION: {
		uint8_t db_tx_attenuation;

		rc = cpack_uint8(s, &db_tx_attenuation);
		if (rc != 0)
			goto trunc;
		ND_PRINT((ndo, "%ddB tx attenuation ", -(int)db_tx_attenuation));
		break;
		}

	case IEEE80211_RADIOTAP_DBM_TX_POWER: {
		int8_t dbm_tx_power;

		rc = cpack_int8(s, &dbm_tx_power);
		if (rc != 0)
			goto trunc;
		ND_PRINT((ndo, "%ddBm tx power ", dbm_tx_power));
		break;
		}

	case IEEE80211_RADIOTAP_ANTENNA: {
		uint8_t antenna;

		rc = cpack_uint8(s, &antenna);
		if (rc != 0)
			goto trunc;
		ND_PRINT((ndo, "antenna %u ", antenna));
		break;
		}

	case IEEE80211_RADIOTAP_DB_ANTSIGNAL: {
		uint8_t db_antsignal;

		rc = cpack_uint8(s, &db_antsignal);
		if (rc != 0)
			goto trunc;
		ND_PRINT((ndo, "%ddB signal ", db_antsignal));
		break;
		}

	case IEEE80211_RADIOTAP_DB_ANTNOISE: {
		uint8_t db_antnoise;

		rc = cpack_uint8(s, &db_antnoise);
		if (rc != 0)
			goto trunc;
		ND_PRINT((ndo, "%ddB noise ", db_antnoise));
		break;
		}

	case IEEE80211_RADIOTAP_RX_FLAGS: {
		uint16_t rx_flags;

		rc = cpack_uint16(s, &rx_flags);
		if (rc != 0)
			goto trunc;
		/* Do nothing for now */
		break;
		}

	case IEEE80211_RADIOTAP_XCHANNEL: {
		uint32_t flags;
		uint16_t frequency;
		uint8_t channel;
		uint8_t maxpower;

		rc = cpack_uint32(s, &flags);
		if (rc != 0)
			goto trunc;
		rc = cpack_uint16(s, &frequency);
		if (rc != 0)
			goto trunc;
		rc = cpack_uint8(s, &channel);
		if (rc != 0)
			goto trunc;
		rc = cpack_uint8(s, &maxpower);
		if (rc != 0)
			goto trunc;
		print_chaninfo(ndo, frequency, flags, presentflags);
		break;
		}

	case IEEE80211_RADIOTAP_MCS: {
		uint8_t known;
		uint8_t flags;
		uint8_t mcs_index;
		static const char *ht_bandwidth[4] = {
			"20 MHz",
			"40 MHz",
			"20 MHz (L)",
			"20 MHz (U)"
		};
		float htrate;

		rc = cpack_uint8(s, &known);
		if (rc != 0)
			goto trunc;
		rc = cpack_uint8(s, &flags);
		if (rc != 0)
			goto trunc;
		rc = cpack_uint8(s, &mcs_index);
		if (rc != 0)
			goto trunc;
		if (known & IEEE80211_RADIOTAP_MCS_MCS_INDEX_KNOWN) {
			/*
			 * We know the MCS index.
			 */
			if (mcs_index <= MAX_MCS_INDEX) {
				/*
				 * And it's in-range.
				 */
				if (known & (IEEE80211_RADIOTAP_MCS_BANDWIDTH_KNOWN|IEEE80211_RADIOTAP_MCS_GUARD_INTERVAL_KNOWN)) {
					/*
					 * And we know both the bandwidth and
					 * the guard interval, so we can look
					 * up the rate.
					 */
					htrate =
						ieee80211_float_htrates \
							[mcs_index] \
							[((flags & IEEE80211_RADIOTAP_MCS_BANDWIDTH_MASK) == IEEE80211_RADIOTAP_MCS_BANDWIDTH_40 ? 1 : 0)] \
							[((flags & IEEE80211_RADIOTAP_MCS_SHORT_GI) ? 1 : 0)];
				} else {
					/*
					 * We don't know both the bandwidth
					 * and the guard interval, so we can
					 * only report the MCS index.
					 */
					htrate = 0.0;
				}
			} else {
				/*
				 * The MCS value is out of range.
				 */
				htrate = 0.0;
			}
			if (htrate != 0.0) {
				/*
				 * We have the rate.
				 * Print it.
				 */
				ND_PRINT((ndo, "%.1f Mb/s MCS %u ", htrate, mcs_index));
			} else {
				/*
				 * We at least have the MCS index.
				 * Print it.
				 */
				ND_PRINT((ndo, "MCS %u ", mcs_index));
			}
		}
		if (known & IEEE80211_RADIOTAP_MCS_BANDWIDTH_KNOWN) {
			ND_PRINT((ndo, "%s ",
				ht_bandwidth[flags & IEEE80211_RADIOTAP_MCS_BANDWIDTH_MASK]));
		}
		if (known & IEEE80211_RADIOTAP_MCS_GUARD_INTERVAL_KNOWN) {
			ND_PRINT((ndo, "%s GI ",
				(flags & IEEE80211_RADIOTAP_MCS_SHORT_GI) ?
				"short" : "long"));
		}
		if (known & IEEE80211_RADIOTAP_MCS_HT_FORMAT_KNOWN) {
			ND_PRINT((ndo, "%s ",
				(flags & IEEE80211_RADIOTAP_MCS_HT_GREENFIELD) ?
				"greenfield" : "mixed"));
		}
		if (known & IEEE80211_RADIOTAP_MCS_FEC_TYPE_KNOWN) {
			ND_PRINT((ndo, "%s FEC ",
				(flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) ?
				"LDPC" : "BCC"));
		}
		if (known & IEEE80211_RADIOTAP_MCS_STBC_KNOWN) {
			ND_PRINT((ndo, "RX-STBC%u ",
				(flags & IEEE80211_RADIOTAP_MCS_STBC_MASK) >> IEEE80211_RADIOTAP_MCS_STBC_SHIFT));
		}
		break;
		}

	case IEEE80211_RADIOTAP_AMPDU_STATUS: {
		uint32_t reference_num;
		uint16_t flags;
		uint8_t delim_crc;
		uint8_t reserved;

		rc = cpack_uint32(s, &reference_num);
		if (rc != 0)
			goto trunc;
		rc = cpack_uint16(s, &flags);
		if (rc != 0)
			goto trunc;
		rc = cpack_uint8(s, &delim_crc);
		if (rc != 0)
			goto trunc;
		rc = cpack_uint8(s, &reserved);
		if (rc != 0)
			goto trunc;
		/* Do nothing for now */
		break;
		}

	case IEEE80211_RADIOTAP_VHT: {
		uint16_t known;
		uint8_t flags;
		uint8_t bandwidth;
		uint8_t mcs_nss[4];
		uint8_t coding;
		uint8_t group_id;
		uint16_t partial_aid;
		static const char *vht_bandwidth[32] = {
			"20 MHz",
			"40 MHz",
			"20 MHz (L)",
			"20 MHz (U)",
			"80 MHz",
			"80 MHz (L)",
			"80 MHz (U)",
			"80 MHz (LL)",
			"80 MHz (LU)",
			"80 MHz (UL)",
			"80 MHz (UU)",
			"160 MHz",
			"160 MHz (L)",
			"160 MHz (U)",
			"160 MHz (LL)",
			"160 MHz (LU)",
			"160 MHz (UL)",
			"160 MHz (UU)",
			"160 MHz (LLL)",
			"160 MHz (LLU)",
			"160 MHz (LUL)",
			"160 MHz (UUU)",
			"160 MHz (ULL)",
			"160 MHz (ULU)",
			"160 MHz (UUL)",
			"160 MHz (UUU)",
			"unknown (26)",
			"unknown (27)",
			"unknown (28)",
			"unknown (29)",
			"unknown (30)",
			"unknown (31)"
		};

		rc = cpack_uint16(s, &known);
		if (rc != 0)
			goto trunc;
		rc = cpack_uint8(s, &flags);
		if (rc != 0)
			goto trunc;
		rc = cpack_uint8(s, &bandwidth);
		if (rc != 0)
			goto trunc;
		for (i = 0; i < 4; i++) {
			rc = cpack_uint8(s, &mcs_nss[i]);
			if (rc != 0)
				goto trunc;
		}
		rc = cpack_uint8(s, &coding);
		if (rc != 0)
			goto trunc;
		rc = cpack_uint8(s, &group_id);
		if (rc != 0)
			goto trunc;
		rc = cpack_uint16(s, &partial_aid);
		if (rc != 0)
			goto trunc;
		for (i = 0; i < 4; i++) {
			u_int nss, mcs;
			nss = mcs_nss[i] & IEEE80211_RADIOTAP_VHT_NSS_MASK;
			mcs = (mcs_nss[i] & IEEE80211_RADIOTAP_VHT_MCS_MASK) >> IEEE80211_RADIOTAP_VHT_MCS_SHIFT;

			if (nss == 0)
				continue;

			ND_PRINT((ndo, "User %u MCS %u ", i, mcs));
			ND_PRINT((ndo, "%s FEC ",
				(coding & (IEEE80211_RADIOTAP_CODING_LDPC_USERn << i)) ?
				"LDPC" : "BCC"));
		}
		if (known & IEEE80211_RADIOTAP_VHT_BANDWIDTH_KNOWN) {
			ND_PRINT((ndo, "%s ",
				vht_bandwidth[bandwidth & IEEE80211_RADIOTAP_VHT_BANDWIDTH_MASK]));
		}
		if (known & IEEE80211_RADIOTAP_VHT_GUARD_INTERVAL_KNOWN) {
			ND_PRINT((ndo, "%s GI ",
				(flags & IEEE80211_RADIOTAP_VHT_SHORT_GI) ?
				"short" : "long"));
		}
		break;
		}

	default:
		/* this bit indicates a field whose
		 * size we do not know, so we cannot
		 * proceed.  Just print the bit number.
		 */
		ND_PRINT((ndo, "[bit %u] ", bit));
		return -1;
	}

	return 0;

trunc:
	ND_PRINT((ndo, "%s", tstr));
	return rc;
}


static int
print_in_radiotap_namespace(netdissect_options *ndo,
                            struct cpack_state *s, uint8_t *flags,
                            uint32_t presentflags, int bit0)
{
#define	BITNO_32(x) (((x) >> 16) ? 16 + BITNO_16((x) >> 16) : BITNO_16((x)))
#define	BITNO_16(x) (((x) >> 8) ? 8 + BITNO_8((x) >> 8) : BITNO_8((x)))
#define	BITNO_8(x) (((x) >> 4) ? 4 + BITNO_4((x) >> 4) : BITNO_4((x)))
#define	BITNO_4(x) (((x) >> 2) ? 2 + BITNO_2((x) >> 2) : BITNO_2((x)))
#define	BITNO_2(x) (((x) & 2) ? 1 : 0)
	uint32_t present, next_present;
	int bitno;
	enum ieee80211_radiotap_type bit;
	int rc;

	for (present = presentflags; present; present = next_present) {
		/*
		 * Clear the least significant bit that is set.
		 */
		next_present = present & (present - 1);

		/*
		 * Get the bit number, within this presence word,
		 * of the remaining least significant bit that
		 * is set.
		 */
		bitno = BITNO_32(present ^ next_present);

		/*
		 * Stop if this is one of the "same meaning
		 * in all presence flags" bits.
		 */
		if (bitno >= IEEE80211_RADIOTAP_NAMESPACE)
			break;

		/*
		 * Get the radiotap bit number of that bit.
		 */
		bit = (enum ieee80211_radiotap_type)(bit0 + bitno);

		rc = print_radiotap_field(ndo, s, bit, flags, presentflags);
		if (rc != 0)
			return rc;
	}

	return 0;
}

static u_int
ieee802_11_radio_print(netdissect_options *ndo,
                       const u_char *p, u_int length, u_int caplen)
{
#define	BIT(n)	(1U << n)
#define	IS_EXTENDED(__p)	\
	    (EXTRACT_LE_32BITS(__p) & BIT(IEEE80211_RADIOTAP_EXT)) != 0

	struct cpack_state cpacker;
	const struct ieee80211_radiotap_header *hdr;
	uint32_t presentflags;
	const uint32_t *presentp, *last_presentp;
	int vendor_namespace;
	uint8_t vendor_oui[3];
	uint8_t vendor_subnamespace;
	uint16_t skip_length;
	int bit0;
	u_int len;
	uint8_t flags;
	int pad;
	u_int fcslen;

	if (caplen < sizeof(*hdr)) {
		ND_PRINT((ndo, "%s", tstr));
		return caplen;
	}

	hdr = (const struct ieee80211_radiotap_header *)p;

	len = EXTRACT_LE_16BITS(&hdr->it_len);

	/*
	 * If we don't have the entire radiotap header, just give up.
	 */
	if (caplen < len) {
		ND_PRINT((ndo, "%s", tstr));
		return caplen;
	}
	cpack_init(&cpacker, (const uint8_t *)hdr, len); /* align against header start */
	cpack_advance(&cpacker, sizeof(*hdr)); /* includes the 1st bitmap */
	for (last_presentp = &hdr->it_present;
	     (const u_char*)(last_presentp + 1) <= p + len &&
	     IS_EXTENDED(last_presentp);
	     last_presentp++)
	  cpack_advance(&cpacker, sizeof(hdr->it_present)); /* more bitmaps */

	/* are there more bitmap extensions than bytes in header? */
	if ((const u_char*)(last_presentp + 1) > p + len) {
		ND_PRINT((ndo, "%s", tstr));
		return caplen;
	}

	/*
	 * Start out at the beginning of the default radiotap namespace.
	 */
	bit0 = 0;
	vendor_namespace = 0;
	memset(vendor_oui, 0, 3);
	vendor_subnamespace = 0;
	skip_length = 0;
	/* Assume no flags */
	flags = 0;
	/* Assume no Atheros padding between 802.11 header and body */
	pad = 0;
	/* Assume no FCS at end of frame */
	fcslen = 0;
	for (presentp = &hdr->it_present; presentp <= last_presentp;
	    presentp++) {
		presentflags = EXTRACT_LE_32BITS(presentp);

		/*
		 * If this is a vendor namespace, we don't handle it.
		 */
		if (vendor_namespace) {
			/*
			 * Skip past the stuff we don't understand.
			 * If we add support for any vendor namespaces,
			 * it'd be added here; use vendor_oui and
			 * vendor_subnamespace to interpret the fields.
			 */
			if (cpack_advance(&cpacker, skip_length) != 0) {
				/*
				 * Ran out of space in the packet.
				 */
				break;
			}

			/*
			 * We've skipped it all; nothing more to
			 * skip.
			 */
			skip_length = 0;
		} else {
			if (print_in_radiotap_namespace(ndo, &cpacker,
			    &flags, presentflags, bit0) != 0) {
				/*
				 * Fatal error - can't process anything
				 * more in the radiotap header.
				 */
				break;
			}
		}

		/*
		 * Handle the namespace switch bits; we've already handled
		 * the extension bit in all but the last word above.
		 */
		switch (presentflags &
		    (BIT(IEEE80211_RADIOTAP_NAMESPACE)|BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE))) {

		case 0:
			/*
			 * We're not changing namespaces.
			 * advance to the next 32 bits in the current
			 * namespace.
			 */
			bit0 += 32;
			break;

		case BIT(IEEE80211_RADIOTAP_NAMESPACE):
			/*
			 * We're switching to the radiotap namespace.
			 * Reset the presence-bitmap index to 0, and
			 * reset the namespace to the default radiotap
			 * namespace.
			 */
			bit0 = 0;
			vendor_namespace = 0;
			memset(vendor_oui, 0, 3);
			vendor_subnamespace = 0;
			skip_length = 0;
			break;

		case BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE):
			/*
			 * We're switching to a vendor namespace.
			 * Reset the presence-bitmap index to 0,
			 * note that we're in a vendor namespace,
			 * and fetch the fields of the Vendor Namespace
			 * item.
			 */
			bit0 = 0;
			vendor_namespace = 1;
			if ((cpack_align_and_reserve(&cpacker, 2)) == NULL) {
				ND_PRINT((ndo, "%s", tstr));
				break;
			}
			if (cpack_uint8(&cpacker, &vendor_oui[0]) != 0) {
				ND_PRINT((ndo, "%s", tstr));
				break;
			}
			if (cpack_uint8(&cpacker, &vendor_oui[1]) != 0) {
				ND_PRINT((ndo, "%s", tstr));
				break;
			}
			if (cpack_uint8(&cpacker, &vendor_oui[2]) != 0) {
				ND_PRINT((ndo, "%s", tstr));
				break;
			}
			if (cpack_uint8(&cpacker, &vendor_subnamespace) != 0) {
				ND_PRINT((ndo, "%s", tstr));
				break;
			}
			if (cpack_uint16(&cpacker, &skip_length) != 0) {
				ND_PRINT((ndo, "%s", tstr));
				break;
			}
			break;

		default:
			/*
			 * Illegal combination.  The behavior in this
			 * case is undefined by the radiotap spec; we
			 * just ignore both bits.
			 */
			break;
		}
	}

	if (flags & IEEE80211_RADIOTAP_F_DATAPAD)
		pad = 1;	/* Atheros padding */
	if (flags & IEEE80211_RADIOTAP_F_FCS)
		fcslen = 4;	/* FCS at end of packet */
	return len + ieee802_11_print(ndo, p + len, length - len, caplen - len, pad,
	    fcslen);
#undef BITNO_32
#undef BITNO_16
#undef BITNO_8
#undef BITNO_4
#undef BITNO_2
#undef BIT
}

static u_int
ieee802_11_avs_radio_print(netdissect_options *ndo,
                           const u_char *p, u_int length, u_int caplen)
{
	uint32_t caphdr_len;

	if (caplen < 8) {
		ND_PRINT((ndo, "%s", tstr));
		return caplen;
	}

	caphdr_len = EXTRACT_32BITS(p + 4);
	if (caphdr_len < 8) {
		/*
		 * Yow!  The capture header length is claimed not
		 * to be large enough to include even the version
		 * cookie or capture header length!
		 */
		ND_PRINT((ndo, "%s", tstr));
		return caplen;
	}

	if (caplen < caphdr_len) {
		ND_PRINT((ndo, "%s", tstr));
		return caplen;
	}

	return caphdr_len + ieee802_11_print(ndo, p + caphdr_len,
	    length - caphdr_len, caplen - caphdr_len, 0, 0);
}

#define PRISM_HDR_LEN		144

#define WLANCAP_MAGIC_COOKIE_BASE 0x80211000
#define WLANCAP_MAGIC_COOKIE_V1	0x80211001
#define WLANCAP_MAGIC_COOKIE_V2	0x80211002

/*
 * For DLT_PRISM_HEADER; like DLT_IEEE802_11, but with an extra header,
 * containing information such as radio information, which we
 * currently ignore.
 *
 * If, however, the packet begins with WLANCAP_MAGIC_COOKIE_V1 or
 * WLANCAP_MAGIC_COOKIE_V2, it's really DLT_IEEE802_11_RADIO_AVS
 * (currently, on Linux, there's no ARPHRD_ type for
 * DLT_IEEE802_11_RADIO_AVS, as there is a ARPHRD_IEEE80211_PRISM
 * for DLT_PRISM_HEADER, so ARPHRD_IEEE80211_PRISM is used for
 * the AVS header, and the first 4 bytes of the header are used to
 * indicate whether it's a Prism header or an AVS header).
 */
u_int
prism_if_print(netdissect_options *ndo,
               const struct pcap_pkthdr *h, const u_char *p)
{
	u_int caplen = h->caplen;
	u_int length = h->len;
	uint32_t msgcode;

	if (caplen < 4) {
		ND_PRINT((ndo, "%s", tstr));
		return caplen;
	}

	msgcode = EXTRACT_32BITS(p);
	if (msgcode == WLANCAP_MAGIC_COOKIE_V1 ||
	    msgcode == WLANCAP_MAGIC_COOKIE_V2)
		return ieee802_11_avs_radio_print(ndo, p, length, caplen);

	if (caplen < PRISM_HDR_LEN) {
		ND_PRINT((ndo, "%s", tstr));
		return caplen;
	}

	return PRISM_HDR_LEN + ieee802_11_print(ndo, p + PRISM_HDR_LEN,
	    length - PRISM_HDR_LEN, caplen - PRISM_HDR_LEN, 0, 0);
}

/*
 * For DLT_IEEE802_11_RADIO; like DLT_IEEE802_11, but with an extra
 * header, containing information such as radio information.
 */
u_int
ieee802_11_radio_if_print(netdissect_options *ndo,
                          const struct pcap_pkthdr *h, const u_char *p)
{
	return ieee802_11_radio_print(ndo, p, h->len, h->caplen);
}

/*
 * For DLT_IEEE802_11_RADIO_AVS; like DLT_IEEE802_11, but with an
 * extra header, containing information such as radio information,
 * which we currently ignore.
 */
u_int
ieee802_11_radio_avs_if_print(netdissect_options *ndo,
                              const struct pcap_pkthdr *h, const u_char *p)
{
	return ieee802_11_avs_radio_print(ndo, p, h->len, h->caplen);
}
OpenPOWER on IntegriCloud