summaryrefslogtreecommitdiff
path: root/net/wireless/reg.c
blob: 56be68a27bb96a84492555a6fe67830674757e08 (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
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
 * Copyright 2008-2011	Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
 * Copyright 2013-2014  Intel Mobile Communications GmbH
 * Copyright      2017  Intel Deutschland GmbH
 * Copyright (C) 2018 Intel Corporation
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */


/**
 * DOC: Wireless regulatory infrastructure
 *
 * The usual implementation is for a driver to read a device EEPROM to
 * determine which regulatory domain it should be operating under, then
 * looking up the allowable channels in a driver-local table and finally
 * registering those channels in the wiphy structure.
 *
 * Another set of compliance enforcement is for drivers to use their
 * own compliance limits which can be stored on the EEPROM. The host
 * driver or firmware may ensure these are used.
 *
 * In addition to all this we provide an extra layer of regulatory
 * conformance. For drivers which do not have any regulatory
 * information CRDA provides the complete regulatory solution.
 * For others it provides a community effort on further restrictions
 * to enhance compliance.
 *
 * Note: When number of rules --> infinity we will not be able to
 * index on alpha2 any more, instead we'll probably have to
 * rely on some SHA1 checksum of the regdomain for example.
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/ctype.h>
#include <linux/nl80211.h>
#include <linux/platform_device.h>
#include <linux/verification.h>
#include <linux/moduleparam.h>
#include <linux/firmware.h>
#include <net/cfg80211.h>
#include "core.h"
#include "reg.h"
#include "rdev-ops.h"
#include "nl80211.h"

/*
 * Grace period we give before making sure all current interfaces reside on
 * channels allowed by the current regulatory domain.
 */
#define REG_ENFORCE_GRACE_MS 60000

/**
 * enum reg_request_treatment - regulatory request treatment
 *
 * @REG_REQ_OK: continue processing the regulatory request
 * @REG_REQ_IGNORE: ignore the regulatory request
 * @REG_REQ_INTERSECT: the regulatory domain resulting from this request should
 *	be intersected with the current one.
 * @REG_REQ_ALREADY_SET: the regulatory request will not change the current
 *	regulatory settings, and no further processing is required.
 */
enum reg_request_treatment {
	REG_REQ_OK,
	REG_REQ_IGNORE,
	REG_REQ_INTERSECT,
	REG_REQ_ALREADY_SET,
};

static struct regulatory_request core_request_world = {
	.initiator = NL80211_REGDOM_SET_BY_CORE,
	.alpha2[0] = '0',
	.alpha2[1] = '0',
	.intersect = false,
	.processed = true,
	.country_ie_env = ENVIRON_ANY,
};

/*
 * Receipt of information from last regulatory request,
 * protected by RTNL (and can be accessed with RCU protection)
 */
static struct regulatory_request __rcu *last_request =
	(void __force __rcu *)&core_request_world;

/* To trigger userspace events and load firmware */
static struct platform_device *reg_pdev;

/*
 * Central wireless core regulatory domains, we only need two,
 * the current one and a world regulatory domain in case we have no
 * information to give us an alpha2.
 * (protected by RTNL, can be read under RCU)
 */
const struct ieee80211_regdomain __rcu *cfg80211_regdomain;

/*
 * Number of devices that registered to the core
 * that support cellular base station regulatory hints
 * (protected by RTNL)
 */
static int reg_num_devs_support_basehint;

/*
 * State variable indicating if the platform on which the devices
 * are attached is operating in an indoor environment. The state variable
 * is relevant for all registered devices.
 */
static bool reg_is_indoor;
static spinlock_t reg_indoor_lock;

/* Used to track the userspace process controlling the indoor setting */
static u32 reg_is_indoor_portid;

static void restore_regulatory_settings(bool reset_user);

static const struct ieee80211_regdomain *get_cfg80211_regdom(void)
{
	return rcu_dereference_rtnl(cfg80211_regdomain);
}

const struct ieee80211_regdomain *get_wiphy_regdom(struct wiphy *wiphy)
{
	return rcu_dereference_rtnl(wiphy->regd);
}

static const char *reg_dfs_region_str(enum nl80211_dfs_regions dfs_region)
{
	switch (dfs_region) {
	case NL80211_DFS_UNSET:
		return "unset";
	case NL80211_DFS_FCC:
		return "FCC";
	case NL80211_DFS_ETSI:
		return "ETSI";
	case NL80211_DFS_JP:
		return "JP";
	}
	return "Unknown";
}

enum nl80211_dfs_regions reg_get_dfs_region(struct wiphy *wiphy)
{
	const struct ieee80211_regdomain *regd = NULL;
	const struct ieee80211_regdomain *wiphy_regd = NULL;

	regd = get_cfg80211_regdom();
	if (!wiphy)
		goto out;

	wiphy_regd = get_wiphy_regdom(wiphy);
	if (!wiphy_regd)
		goto out;

	if (wiphy_regd->dfs_region == regd->dfs_region)
		goto out;

	pr_debug("%s: device specific dfs_region (%s) disagrees with cfg80211's central dfs_region (%s)\n",
		 dev_name(&wiphy->dev),
		 reg_dfs_region_str(wiphy_regd->dfs_region),
		 reg_dfs_region_str(regd->dfs_region));

out:
	return regd->dfs_region;
}

static void rcu_free_regdom(const struct ieee80211_regdomain *r)
{
	if (!r)
		return;
	kfree_rcu((struct ieee80211_regdomain *)r, rcu_head);
}

static struct regulatory_request *get_last_request(void)
{
	return rcu_dereference_rtnl(last_request);
}

/* Used to queue up regulatory hints */
static LIST_HEAD(reg_requests_list);
static spinlock_t reg_requests_lock;

/* Used to queue up beacon hints for review */
static LIST_HEAD(reg_pending_beacons);
static spinlock_t reg_pending_beacons_lock;

/* Used to keep track of processed beacon hints */
static LIST_HEAD(reg_beacon_list);

struct reg_beacon {
	struct list_head list;
	struct ieee80211_channel chan;
};

static void reg_check_chans_work(struct work_struct *work);
static DECLARE_DELAYED_WORK(reg_check_chans, reg_check_chans_work);

static void reg_todo(struct work_struct *work);
static DECLARE_WORK(reg_work, reg_todo);

/* We keep a static world regulatory domain in case of the absence of CRDA */
static const struct ieee80211_regdomain world_regdom = {
	.n_reg_rules = 8,
	.alpha2 =  "00",
	.reg_rules = {
		/* IEEE 802.11b/g, channels 1..11 */
		REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
		/* IEEE 802.11b/g, channels 12..13. */
		REG_RULE(2467-10, 2472+10, 20, 6, 20,
			NL80211_RRF_NO_IR | NL80211_RRF_AUTO_BW),
		/* IEEE 802.11 channel 14 - Only JP enables
		 * this and for 802.11b only */
		REG_RULE(2484-10, 2484+10, 20, 6, 20,
			NL80211_RRF_NO_IR |
			NL80211_RRF_NO_OFDM),
		/* IEEE 802.11a, channel 36..48 */
		REG_RULE(5180-10, 5240+10, 80, 6, 20,
                        NL80211_RRF_NO_IR |
                        NL80211_RRF_AUTO_BW),

		/* IEEE 802.11a, channel 52..64 - DFS required */
		REG_RULE(5260-10, 5320+10, 80, 6, 20,
			NL80211_RRF_NO_IR |
			NL80211_RRF_AUTO_BW |
			NL80211_RRF_DFS),

		/* IEEE 802.11a, channel 100..144 - DFS required */
		REG_RULE(5500-10, 5720+10, 160, 6, 20,
			NL80211_RRF_NO_IR |
			NL80211_RRF_DFS),

		/* IEEE 802.11a, channel 149..165 */
		REG_RULE(5745-10, 5825+10, 80, 6, 20,
			NL80211_RRF_NO_IR),

		/* IEEE 802.11ad (60GHz), channels 1..3 */
		REG_RULE(56160+2160*1-1080, 56160+2160*3+1080, 2160, 0, 0, 0),
	}
};

/* protected by RTNL */
static const struct ieee80211_regdomain *cfg80211_world_regdom =
	&world_regdom;

static char *ieee80211_regdom = "00";
static char user_alpha2[2];

module_param(ieee80211_regdom, charp, 0444);
MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");

static void reg_free_request(struct regulatory_request *request)
{
	if (request == &core_request_world)
		return;

	if (request != get_last_request())
		kfree(request);
}

static void reg_free_last_request(void)
{
	struct regulatory_request *lr = get_last_request();

	if (lr != &core_request_world && lr)
		kfree_rcu(lr, rcu_head);
}

static void reg_update_last_request(struct regulatory_request *request)
{
	struct regulatory_request *lr;

	lr = get_last_request();
	if (lr == request)
		return;

	reg_free_last_request();
	rcu_assign_pointer(last_request, request);
}

static void reset_regdomains(bool full_reset,
			     const struct ieee80211_regdomain *new_regdom)
{
	const struct ieee80211_regdomain *r;

	ASSERT_RTNL();

	r = get_cfg80211_regdom();

	/* avoid freeing static information or freeing something twice */
	if (r == cfg80211_world_regdom)
		r = NULL;
	if (cfg80211_world_regdom == &world_regdom)
		cfg80211_world_regdom = NULL;
	if (r == &world_regdom)
		r = NULL;

	rcu_free_regdom(r);
	rcu_free_regdom(cfg80211_world_regdom);

	cfg80211_world_regdom = &world_regdom;
	rcu_assign_pointer(cfg80211_regdomain, new_regdom);

	if (!full_reset)
		return;

	reg_update_last_request(&core_request_world);
}

/*
 * Dynamic world regulatory domain requested by the wireless
 * core upon initialization
 */
static void update_world_regdomain(const struct ieee80211_regdomain *rd)
{
	struct regulatory_request *lr;

	lr = get_last_request();

	WARN_ON(!lr);

	reset_regdomains(false, rd);

	cfg80211_world_regdom = rd;
}

bool is_world_regdom(const char *alpha2)
{
	if (!alpha2)
		return false;
	return alpha2[0] == '0' && alpha2[1] == '0';
}

static bool is_alpha2_set(const char *alpha2)
{
	if (!alpha2)
		return false;
	return alpha2[0] && alpha2[1];
}

static bool is_unknown_alpha2(const char *alpha2)
{
	if (!alpha2)
		return false;
	/*
	 * Special case where regulatory domain was built by driver
	 * but a specific alpha2 cannot be determined
	 */
	return alpha2[0] == '9' && alpha2[1] == '9';
}

static bool is_intersected_alpha2(const char *alpha2)
{
	if (!alpha2)
		return false;
	/*
	 * Special case where regulatory domain is the
	 * result of an intersection between two regulatory domain
	 * structures
	 */
	return alpha2[0] == '9' && alpha2[1] == '8';
}

static bool is_an_alpha2(const char *alpha2)
{
	if (!alpha2)
		return false;
	return isalpha(alpha2[0]) && isalpha(alpha2[1]);
}

static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
{
	if (!alpha2_x || !alpha2_y)
		return false;
	return alpha2_x[0] == alpha2_y[0] && alpha2_x[1] == alpha2_y[1];
}

static bool regdom_changes(const char *alpha2)
{
	const struct ieee80211_regdomain *r = get_cfg80211_regdom();

	if (!r)
		return true;
	return !alpha2_equal(r->alpha2, alpha2);
}

/*
 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
 * has ever been issued.
 */
static bool is_user_regdom_saved(void)
{
	if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
		return false;

	/* This would indicate a mistake on the design */
	if (WARN(!is_world_regdom(user_alpha2) && !is_an_alpha2(user_alpha2),
		 "Unexpected user alpha2: %c%c\n",
		 user_alpha2[0], user_alpha2[1]))
		return false;

	return true;
}

static const struct ieee80211_regdomain *
reg_copy_regd(const struct ieee80211_regdomain *src_regd)
{
	struct ieee80211_regdomain *regd;
	int size_of_regd;
	unsigned int i;

	size_of_regd =
		sizeof(struct ieee80211_regdomain) +
		src_regd->n_reg_rules * sizeof(struct ieee80211_reg_rule);

	regd = kzalloc(size_of_regd, GFP_KERNEL);
	if (!regd)
		return ERR_PTR(-ENOMEM);

	memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));

	for (i = 0; i < src_regd->n_reg_rules; i++)
		memcpy(&regd->reg_rules[i], &src_regd->reg_rules[i],
		       sizeof(struct ieee80211_reg_rule));

	return regd;
}

struct reg_regdb_apply_request {
	struct list_head list;
	const struct ieee80211_regdomain *regdom;
};

static LIST_HEAD(reg_regdb_apply_list);
static DEFINE_MUTEX(reg_regdb_apply_mutex);

static void reg_regdb_apply(struct work_struct *work)
{
	struct reg_regdb_apply_request *request;

	rtnl_lock();

	mutex_lock(&reg_regdb_apply_mutex);
	while (!list_empty(&reg_regdb_apply_list)) {
		request = list_first_entry(&reg_regdb_apply_list,
					   struct reg_regdb_apply_request,
					   list);
		list_del(&request->list);

		set_regdom(request->regdom, REGD_SOURCE_INTERNAL_DB);
		kfree(request);
	}
	mutex_unlock(&reg_regdb_apply_mutex);

	rtnl_unlock();
}

static DECLARE_WORK(reg_regdb_work, reg_regdb_apply);

static int reg_schedule_apply(const struct ieee80211_regdomain *regdom)
{
	struct reg_regdb_apply_request *request;

	request = kzalloc(sizeof(struct reg_regdb_apply_request), GFP_KERNEL);
	if (!request) {
		kfree(regdom);
		return -ENOMEM;
	}

	request->regdom = regdom;

	mutex_lock(&reg_regdb_apply_mutex);
	list_add_tail(&request->list, &reg_regdb_apply_list);
	mutex_unlock(&reg_regdb_apply_mutex);

	schedule_work(&reg_regdb_work);
	return 0;
}

#ifdef CONFIG_CFG80211_CRDA_SUPPORT
/* Max number of consecutive attempts to communicate with CRDA  */
#define REG_MAX_CRDA_TIMEOUTS 10

static u32 reg_crda_timeouts;

static void crda_timeout_work(struct work_struct *work);
static DECLARE_DELAYED_WORK(crda_timeout, crda_timeout_work);

static void crda_timeout_work(struct work_struct *work)
{
	pr_debug("Timeout while waiting for CRDA to reply, restoring regulatory settings\n");
	rtnl_lock();
	reg_crda_timeouts++;
	restore_regulatory_settings(true);
	rtnl_unlock();
}

static void cancel_crda_timeout(void)
{
	cancel_delayed_work(&crda_timeout);
}

static void cancel_crda_timeout_sync(void)
{
	cancel_delayed_work_sync(&crda_timeout);
}

static void reset_crda_timeouts(void)
{
	reg_crda_timeouts = 0;
}

/*
 * This lets us keep regulatory code which is updated on a regulatory
 * basis in userspace.
 */
static int call_crda(const char *alpha2)
{
	char country[12];
	char *env[] = { country, NULL };
	int ret;

	snprintf(country, sizeof(country), "COUNTRY=%c%c",
		 alpha2[0], alpha2[1]);

	if (reg_crda_timeouts > REG_MAX_CRDA_TIMEOUTS) {
		pr_debug("Exceeded CRDA call max attempts. Not calling CRDA\n");
		return -EINVAL;
	}

	if (!is_world_regdom((char *) alpha2))
		pr_debug("Calling CRDA for country: %c%c\n",
			 alpha2[0], alpha2[1]);
	else
		pr_debug("Calling CRDA to update world regulatory domain\n");

	ret = kobject_uevent_env(&reg_pdev->dev.kobj, KOBJ_CHANGE, env);
	if (ret)
		return ret;

	queue_delayed_work(system_power_efficient_wq,
			   &crda_timeout, msecs_to_jiffies(3142));
	return 0;
}
#else
static inline void cancel_crda_timeout(void) {}
static inline void cancel_crda_timeout_sync(void) {}
static inline void reset_crda_timeouts(void) {}
static inline int call_crda(const char *alpha2)
{
	return -ENODATA;
}
#endif /* CONFIG_CFG80211_CRDA_SUPPORT */

/* code to directly load a firmware database through request_firmware */
static const struct fwdb_header *regdb;

struct fwdb_country {
	u8 alpha2[2];
	__be16 coll_ptr;
	/* this struct cannot be extended */
} __packed __aligned(4);

struct fwdb_collection {
	u8 len;
	u8 n_rules;
	u8 dfs_region;
	/* no optional data yet */
	/* aligned to 2, then followed by __be16 array of rule pointers */
} __packed __aligned(4);

enum fwdb_flags {
	FWDB_FLAG_NO_OFDM	= BIT(0),
	FWDB_FLAG_NO_OUTDOOR	= BIT(1),
	FWDB_FLAG_DFS		= BIT(2),
	FWDB_FLAG_NO_IR		= BIT(3),
	FWDB_FLAG_AUTO_BW	= BIT(4),
};

struct fwdb_wmm_ac {
	u8 ecw;
	u8 aifsn;
	__be16 cot;
} __packed;

struct fwdb_wmm_rule {
	struct fwdb_wmm_ac client[IEEE80211_NUM_ACS];
	struct fwdb_wmm_ac ap[IEEE80211_NUM_ACS];
} __packed;

struct fwdb_rule {
	u8 len;
	u8 flags;
	__be16 max_eirp;
	__be32 start, end, max_bw;
	/* start of optional data */
	__be16 cac_timeout;
	__be16 wmm_ptr;
} __packed __aligned(4);

#define FWDB_MAGIC 0x52474442
#define FWDB_VERSION 20

struct fwdb_header {
	__be32 magic;
	__be32 version;
	struct fwdb_country country[];
} __packed __aligned(4);

static int ecw2cw(int ecw)
{
	return (1 << ecw) - 1;
}

static bool valid_wmm(struct fwdb_wmm_rule *rule)
{
	struct fwdb_wmm_ac *ac = (struct fwdb_wmm_ac *)rule;
	int i;

	for (i = 0; i < IEEE80211_NUM_ACS * 2; i++) {
		u16 cw_min = ecw2cw((ac[i].ecw & 0xf0) >> 4);
		u16 cw_max = ecw2cw(ac[i].ecw & 0x0f);
		u8 aifsn = ac[i].aifsn;

		if (cw_min >= cw_max)
			return false;

		if (aifsn < 1)
			return false;
	}

	return true;
}

static bool valid_rule(const u8 *data, unsigned int size, u16 rule_ptr)
{
	struct fwdb_rule *rule = (void *)(data + (rule_ptr << 2));

	if ((u8 *)rule + sizeof(rule->len) > data + size)
		return false;

	/* mandatory fields */
	if (rule->len < offsetofend(struct fwdb_rule, max_bw))
		return false;
	if (rule->len >= offsetofend(struct fwdb_rule, wmm_ptr)) {
		u32 wmm_ptr = be16_to_cpu(rule->wmm_ptr) << 2;
		struct fwdb_wmm_rule *wmm;

		if (wmm_ptr + sizeof(struct fwdb_wmm_rule) > size)
			return false;

		wmm = (void *)(data + wmm_ptr);

		if (!valid_wmm(wmm))
			return false;
	}
	return true;
}

static bool valid_country(const u8 *data, unsigned int size,
			  const struct fwdb_country *country)
{
	unsigned int ptr = be16_to_cpu(country->coll_ptr) << 2;
	struct fwdb_collection *coll = (void *)(data + ptr);
	__be16 *rules_ptr;
	unsigned int i;

	/* make sure we can read len/n_rules */
	if ((u8 *)coll + offsetofend(typeof(*coll), n_rules) > data + size)
		return false;

	/* make sure base struct and all rules fit */
	if ((u8 *)coll + ALIGN(coll->len, 2) +
	    (coll->n_rules * 2) > data + size)
		return false;

	/* mandatory fields must exist */
	if (coll->len < offsetofend(struct fwdb_collection, dfs_region))
		return false;

	rules_ptr = (void *)((u8 *)coll + ALIGN(coll->len, 2));

	for (i = 0; i < coll->n_rules; i++) {
		u16 rule_ptr = be16_to_cpu(rules_ptr[i]);

		if (!valid_rule(data, size, rule_ptr))
			return false;
	}

	return true;
}

#ifdef CONFIG_CFG80211_REQUIRE_SIGNED_REGDB
static struct key *builtin_regdb_keys;

static void __init load_keys_from_buffer(const u8 *p, unsigned int buflen)
{
	const u8 *end = p + buflen;
	size_t plen;
	key_ref_t key;

	while (p < end) {
		/* Each cert begins with an ASN.1 SEQUENCE tag and must be more
		 * than 256 bytes in size.
		 */
		if (end - p < 4)
			goto dodgy_cert;
		if (p[0] != 0x30 &&
		    p[1] != 0x82)
			goto dodgy_cert;
		plen = (p[2] << 8) | p[3];
		plen += 4;
		if (plen > end - p)
			goto dodgy_cert;

		key = key_create_or_update(make_key_ref(builtin_regdb_keys, 1),
					   "asymmetric", NULL, p, plen,
					   ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
					    KEY_USR_VIEW | KEY_USR_READ),
					   KEY_ALLOC_NOT_IN_QUOTA |
					   KEY_ALLOC_BUILT_IN |
					   KEY_ALLOC_BYPASS_RESTRICTION);
		if (IS_ERR(key)) {
			pr_err("Problem loading in-kernel X.509 certificate (%ld)\n",
			       PTR_ERR(key));
		} else {
			pr_notice("Loaded X.509 cert '%s'\n",
				  key_ref_to_ptr(key)->description);
			key_ref_put(key);
		}
		p += plen;
	}

	return;

dodgy_cert:
	pr_err("Problem parsing in-kernel X.509 certificate list\n");
}

static int __init load_builtin_regdb_keys(void)
{
	builtin_regdb_keys =
		keyring_alloc(".builtin_regdb_keys",
			      KUIDT_INIT(0), KGIDT_INIT(0), current_cred(),
			      ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
			      KEY_USR_VIEW | KEY_USR_READ | KEY_USR_SEARCH),
			      KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
	if (IS_ERR(builtin_regdb_keys))
		return PTR_ERR(builtin_regdb_keys);

	pr_notice("Loading compiled-in X.509 certificates for regulatory database\n");

#ifdef CONFIG_CFG80211_USE_KERNEL_REGDB_KEYS
	load_keys_from_buffer(shipped_regdb_certs, shipped_regdb_certs_len);
#endif
#ifdef CONFIG_CFG80211_EXTRA_REGDB_KEYDIR
	if (CONFIG_CFG80211_EXTRA_REGDB_KEYDIR[0] != '\0')
		load_keys_from_buffer(extra_regdb_certs, extra_regdb_certs_len);
#endif

	return 0;
}

static bool regdb_has_valid_signature(const u8 *data, unsigned int size)
{
	const struct firmware *sig;
	bool result;

	if (request_firmware(&sig, "regulatory.db.p7s", &reg_pdev->dev))
		return false;

	result = verify_pkcs7_signature(data, size, sig->data, sig->size,
					builtin_regdb_keys,
					VERIFYING_UNSPECIFIED_SIGNATURE,
					NULL, NULL) == 0;

	release_firmware(sig);

	return result;
}

static void free_regdb_keyring(void)
{
	key_put(builtin_regdb_keys);
}
#else
static int load_builtin_regdb_keys(void)
{
	return 0;
}

static bool regdb_has_valid_signature(const u8 *data, unsigned int size)
{
	return true;
}

static void free_regdb_keyring(void)
{
}
#endif /* CONFIG_CFG80211_REQUIRE_SIGNED_REGDB */

static bool valid_regdb(const u8 *data, unsigned int size)
{
	const struct fwdb_header *hdr = (void *)data;
	const struct fwdb_country *country;

	if (size < sizeof(*hdr))
		return false;

	if (hdr->magic != cpu_to_be32(FWDB_MAGIC))
		return false;

	if (hdr->version != cpu_to_be32(FWDB_VERSION))
		return false;

	if (!regdb_has_valid_signature(data, size))
		return false;

	country = &hdr->country[0];
	while ((u8 *)(country + 1) <= data + size) {
		if (!country->coll_ptr)
			break;
		if (!valid_country(data, size, country))
			return false;
		country++;
	}

	return true;
}

static void set_wmm_rule(const struct fwdb_header *db,
			 const struct fwdb_country *country,
			 const struct fwdb_rule *rule,
			 struct ieee80211_reg_rule *rrule)
{
	struct ieee80211_wmm_rule *wmm_rule = &rrule->wmm_rule;
	struct fwdb_wmm_rule *wmm;
	unsigned int i, wmm_ptr;

	wmm_ptr = be16_to_cpu(rule->wmm_ptr) << 2;
	wmm = (void *)((u8 *)db + wmm_ptr);

	if (!valid_wmm(wmm)) {
		pr_err("Invalid regulatory WMM rule %u-%u in domain %c%c\n",
		       be32_to_cpu(rule->start), be32_to_cpu(rule->end),
		       country->alpha2[0], country->alpha2[1]);
		return;
	}

	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
		wmm_rule->client[i].cw_min =
			ecw2cw((wmm->client[i].ecw & 0xf0) >> 4);
		wmm_rule->client[i].cw_max = ecw2cw(wmm->client[i].ecw & 0x0f);
		wmm_rule->client[i].aifsn =  wmm->client[i].aifsn;
		wmm_rule->client[i].cot =
			1000 * be16_to_cpu(wmm->client[i].cot);
		wmm_rule->ap[i].cw_min = ecw2cw((wmm->ap[i].ecw & 0xf0) >> 4);
		wmm_rule->ap[i].cw_max = ecw2cw(wmm->ap[i].ecw & 0x0f);
		wmm_rule->ap[i].aifsn = wmm->ap[i].aifsn;
		wmm_rule->ap[i].cot = 1000 * be16_to_cpu(wmm->ap[i].cot);
	}

	rrule->has_wmm = true;
}

static int __regdb_query_wmm(const struct fwdb_header *db,
			     const struct fwdb_country *country, int freq,
			     struct ieee80211_reg_rule *rrule)
{
	unsigned int ptr = be16_to_cpu(country->coll_ptr) << 2;
	struct fwdb_collection *coll = (void *)((u8 *)db + ptr);
	int i;

	for (i = 0; i < coll->n_rules; i++) {
		__be16 *rules_ptr = (void *)((u8 *)coll + ALIGN(coll->len, 2));
		unsigned int rule_ptr = be16_to_cpu(rules_ptr[i]) << 2;
		struct fwdb_rule *rule = (void *)((u8 *)db + rule_ptr);

		if (rule->len < offsetofend(struct fwdb_rule, wmm_ptr))
			continue;

		if (freq >= KHZ_TO_MHZ(be32_to_cpu(rule->start)) &&
		    freq <= KHZ_TO_MHZ(be32_to_cpu(rule->end))) {
			set_wmm_rule(db, country, rule, rrule);
			return 0;
		}
	}

	return -ENODATA;
}

int reg_query_regdb_wmm(char *alpha2, int freq, struct ieee80211_reg_rule *rule)
{
	const struct fwdb_header *hdr = regdb;
	const struct fwdb_country *country;

	if (!regdb)
		return -ENODATA;

	if (IS_ERR(regdb))
		return PTR_ERR(regdb);

	country = &hdr->country[0];
	while (country->coll_ptr) {
		if (alpha2_equal(alpha2, country->alpha2))
			return __regdb_query_wmm(regdb, country, freq, rule);

		country++;
	}

	return -ENODATA;
}
EXPORT_SYMBOL(reg_query_regdb_wmm);

static int regdb_query_country(const struct fwdb_header *db,
			       const struct fwdb_country *country)
{
	unsigned int ptr = be16_to_cpu(country->coll_ptr) << 2;
	struct fwdb_collection *coll = (void *)((u8 *)db + ptr);
	struct ieee80211_regdomain *regdom;
	unsigned int size_of_regd, i;

	size_of_regd = sizeof(struct ieee80211_regdomain) +
		coll->n_rules * sizeof(struct ieee80211_reg_rule);

	regdom = kzalloc(size_of_regd, GFP_KERNEL);
	if (!regdom)
		return -ENOMEM;

	regdom->n_reg_rules = coll->n_rules;
	regdom->alpha2[0] = country->alpha2[0];
	regdom->alpha2[1] = country->alpha2[1];
	regdom->dfs_region = coll->dfs_region;

	for (i = 0; i < regdom->n_reg_rules; i++) {
		__be16 *rules_ptr = (void *)((u8 *)coll + ALIGN(coll->len, 2));
		unsigned int rule_ptr = be16_to_cpu(rules_ptr[i]) << 2;
		struct fwdb_rule *rule = (void *)((u8 *)db + rule_ptr);
		struct ieee80211_reg_rule *rrule = &regdom->reg_rules[i];

		rrule->freq_range.start_freq_khz = be32_to_cpu(rule->start);
		rrule->freq_range.end_freq_khz = be32_to_cpu(rule->end);
		rrule->freq_range.max_bandwidth_khz = be32_to_cpu(rule->max_bw);

		rrule->power_rule.max_antenna_gain = 0;
		rrule->power_rule.max_eirp = be16_to_cpu(rule->max_eirp);

		rrule->flags = 0;
		if (rule->flags & FWDB_FLAG_NO_OFDM)
			rrule->flags |= NL80211_RRF_NO_OFDM;
		if (rule->flags & FWDB_FLAG_NO_OUTDOOR)
			rrule->flags |= NL80211_RRF_NO_OUTDOOR;
		if (rule->flags & FWDB_FLAG_DFS)
			rrule->flags |= NL80211_RRF_DFS;
		if (rule->flags & FWDB_FLAG_NO_IR)
			rrule->flags |= NL80211_RRF_NO_IR;
		if (rule->flags & FWDB_FLAG_AUTO_BW)
			rrule->flags |= NL80211_RRF_AUTO_BW;

		rrule->dfs_cac_ms = 0;

		/* handle optional data */
		if (rule->len >= offsetofend(struct fwdb_rule, cac_timeout))
			rrule->dfs_cac_ms =
				1000 * be16_to_cpu(rule->cac_timeout);
		if (rule->len >= offsetofend(struct fwdb_rule, wmm_ptr))
			set_wmm_rule(db, country, rule, rrule);
	}

	return reg_schedule_apply(regdom);
}

static int query_regdb(const char *alpha2)
{
	const struct fwdb_header *hdr = regdb;
	const struct fwdb_country *country;

	ASSERT_RTNL();

	if (IS_ERR(regdb))
		return PTR_ERR(regdb);

	country = &hdr->country[0];
	while (country->coll_ptr) {
		if (alpha2_equal(alpha2, country->alpha2))
			return regdb_query_country(regdb, country);
		country++;
	}

	return -ENODATA;
}

static void regdb_fw_cb(const struct firmware *fw, void *context)
{
	int set_error = 0;
	bool restore = true;
	void *db;

	if (!fw) {
		pr_info("failed to load regulatory.db\n");
		set_error = -ENODATA;
	} else if (!valid_regdb(fw->data, fw->size)) {
		pr_info("loaded regulatory.db is malformed or signature is missing/invalid\n");
		set_error = -EINVAL;
	}

	rtnl_lock();
	if (WARN_ON(regdb && !IS_ERR(regdb))) {
		/* just restore and free new db */
	} else if (set_error) {
		regdb = ERR_PTR(set_error);
	} else if (fw) {
		db = kmemdup(fw->data, fw->size, GFP_KERNEL);
		if (db) {
			regdb = db;
			restore = context && query_regdb(context);
		} else {
			restore = true;
		}
	}

	if (restore)
		restore_regulatory_settings(true);

	rtnl_unlock();

	kfree(context);

	release_firmware(fw);
}

static int query_regdb_file(const char *alpha2)
{
	ASSERT_RTNL();

	if (regdb)
		return query_regdb(alpha2);

	alpha2 = kmemdup(alpha2, 2, GFP_KERNEL);
	if (!alpha2)
		return -ENOMEM;

	return request_firmware_nowait(THIS_MODULE, true, "regulatory.db",
				       &reg_pdev->dev, GFP_KERNEL,
				       (void *)alpha2, regdb_fw_cb);
}

int reg_reload_regdb(void)
{
	const struct firmware *fw;
	void *db;
	int err;

	err = request_firmware(&fw, "regulatory.db", &reg_pdev->dev);
	if (err)
		return err;

	if (!valid_regdb(fw->data, fw->size)) {
		err = -ENODATA;
		goto out;
	}

	db = kmemdup(fw->data, fw->size, GFP_KERNEL);
	if (!db) {
		err = -ENOMEM;
		goto out;
	}

	rtnl_lock();
	if (!IS_ERR_OR_NULL(regdb))
		kfree(regdb);
	regdb = db;
	rtnl_unlock();

 out:
	release_firmware(fw);
	return err;
}

static bool reg_query_database(struct regulatory_request *request)
{
	if (query_regdb_file(request->alpha2) == 0)
		return true;

	if (call_crda(request->alpha2) == 0)
		return true;

	return false;
}

bool reg_is_valid_request(const char *alpha2)
{
	struct regulatory_request *lr = get_last_request();

	if (!lr || lr->processed)
		return false;

	return alpha2_equal(lr->alpha2, alpha2);
}

static const struct ieee80211_regdomain *reg_get_regdomain(struct wiphy *wiphy)
{
	struct regulatory_request *lr = get_last_request();

	/*
	 * Follow the driver's regulatory domain, if present, unless a country
	 * IE has been processed or a user wants to help complaince further
	 */
	if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
	    lr->initiator != NL80211_REGDOM_SET_BY_USER &&
	    wiphy->regd)
		return get_wiphy_regdom(wiphy);

	return get_cfg80211_regdom();
}

static unsigned int
reg_get_max_bandwidth_from_range(const struct ieee80211_regdomain *rd,
				 const struct ieee80211_reg_rule *rule)
{
	const struct ieee80211_freq_range *freq_range = &rule->freq_range;
	const struct ieee80211_freq_range *freq_range_tmp;
	const struct ieee80211_reg_rule *tmp;
	u32 start_freq, end_freq, idx, no;

	for (idx = 0; idx < rd->n_reg_rules; idx++)
		if (rule == &rd->reg_rules[idx])
			break;

	if (idx == rd->n_reg_rules)
		return 0;

	/* get start_freq */
	no = idx;

	while (no) {
		tmp = &rd->reg_rules[--no];
		freq_range_tmp = &tmp->freq_range;

		if (freq_range_tmp->end_freq_khz < freq_range->start_freq_khz)
			break;

		freq_range = freq_range_tmp;
	}

	start_freq = freq_range->start_freq_khz;

	/* get end_freq */
	freq_range = &rule->freq_range;
	no = idx;

	while (no < rd->n_reg_rules - 1) {
		tmp = &rd->reg_rules[++no];
		freq_range_tmp = &tmp->freq_range;

		if (freq_range_tmp->start_freq_khz > freq_range->end_freq_khz)
			break;

		freq_range = freq_range_tmp;
	}

	end_freq = freq_range->end_freq_khz;

	return end_freq - start_freq;
}

unsigned int reg_get_max_bandwidth(const struct ieee80211_regdomain *rd,
				   const struct ieee80211_reg_rule *rule)
{
	unsigned int bw = reg_get_max_bandwidth_from_range(rd, rule);

	if (rule->flags & NL80211_RRF_NO_160MHZ)
		bw = min_t(unsigned int, bw, MHZ_TO_KHZ(80));
	if (rule->flags & NL80211_RRF_NO_80MHZ)
		bw = min_t(unsigned int, bw, MHZ_TO_KHZ(40));

	/*
	 * HT40+/HT40- limits are handled per-channel. Only limit BW if both
	 * are not allowed.
	 */
	if (rule->flags & NL80211_RRF_NO_HT40MINUS &&
	    rule->flags & NL80211_RRF_NO_HT40PLUS)
		bw = min_t(unsigned int, bw, MHZ_TO_KHZ(20));

	return bw;
}

/* Sanity check on a regulatory rule */
static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
{
	const struct ieee80211_freq_range *freq_range = &rule->freq_range;
	u32 freq_diff;

	if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
		return false;

	if (freq_range->start_freq_khz > freq_range->end_freq_khz)
		return false;

	freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;

	if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
	    freq_range->max_bandwidth_khz > freq_diff)
		return false;

	return true;
}

static bool is_valid_rd(const struct ieee80211_regdomain *rd)
{
	const struct ieee80211_reg_rule *reg_rule = NULL;
	unsigned int i;

	if (!rd->n_reg_rules)
		return false;

	if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
		return false;

	for (i = 0; i < rd->n_reg_rules; i++) {
		reg_rule = &rd->reg_rules[i];
		if (!is_valid_reg_rule(reg_rule))
			return false;
	}

	return true;
}

/**
 * freq_in_rule_band - tells us if a frequency is in a frequency band
 * @freq_range: frequency rule we want to query
 * @freq_khz: frequency we are inquiring about
 *
 * This lets us know if a specific frequency rule is or is not relevant to
 * a specific frequency's band. Bands are device specific and artificial
 * definitions (the "2.4 GHz band", the "5 GHz band" and the "60GHz band"),
 * however it is safe for now to assume that a frequency rule should not be
 * part of a frequency's band if the start freq or end freq are off by more
 * than 2 GHz for the 2.4 and 5 GHz bands, and by more than 10 GHz for the
 * 60 GHz band.
 * This resolution can be lowered and should be considered as we add
 * regulatory rule support for other "bands".
 **/
static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
			      u32 freq_khz)
{
#define ONE_GHZ_IN_KHZ	1000000
	/*
	 * From 802.11ad: directional multi-gigabit (DMG):
	 * Pertaining to operation in a frequency band containing a channel
	 * with the Channel starting frequency above 45 GHz.
	 */
	u32 limit = freq_khz > 45 * ONE_GHZ_IN_KHZ ?
			10 * ONE_GHZ_IN_KHZ : 2 * ONE_GHZ_IN_KHZ;
	if (abs(freq_khz - freq_range->start_freq_khz) <= limit)
		return true;
	if (abs(freq_khz - freq_range->end_freq_khz) <= limit)
		return true;
	return false;
#undef ONE_GHZ_IN_KHZ
}

/*
 * Later on we can perhaps use the more restrictive DFS
 * region but we don't have information for that yet so
 * for now simply disallow conflicts.
 */
static enum nl80211_dfs_regions
reg_intersect_dfs_region(const enum nl80211_dfs_regions dfs_region1,
			 const enum nl80211_dfs_regions dfs_region2)
{
	if (dfs_region1 != dfs_region2)
		return NL80211_DFS_UNSET;
	return dfs_region1;
}

/*
 * Helper for regdom_intersect(), this does the real
 * mathematical intersection fun
 */
static int reg_rules_intersect(const struct ieee80211_regdomain *rd1,
			       const struct ieee80211_regdomain *rd2,
			       const struct ieee80211_reg_rule *rule1,
			       const struct ieee80211_reg_rule *rule2,
			       struct ieee80211_reg_rule *intersected_rule)
{
	const struct ieee80211_freq_range *freq_range1, *freq_range2;
	struct ieee80211_freq_range *freq_range;
	const struct ieee80211_power_rule *power_rule1, *power_rule2;
	struct ieee80211_power_rule *power_rule;
	u32 freq_diff, max_bandwidth1, max_bandwidth2;

	freq_range1 = &rule1->freq_range;
	freq_range2 = &rule2->freq_range;
	freq_range = &intersected_rule->freq_range;

	power_rule1 = &rule1->power_rule;
	power_rule2 = &rule2->power_rule;
	power_rule = &intersected_rule->power_rule;

	freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
					 freq_range2->start_freq_khz);
	freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
				       freq_range2->end_freq_khz);

	max_bandwidth1 = freq_range1->max_bandwidth_khz;
	max_bandwidth2 = freq_range2->max_bandwidth_khz;

	if (rule1->flags & NL80211_RRF_AUTO_BW)
		max_bandwidth1 = reg_get_max_bandwidth(rd1, rule1);
	if (rule2->flags & NL80211_RRF_AUTO_BW)
		max_bandwidth2 = reg_get_max_bandwidth(rd2, rule2);

	freq_range->max_bandwidth_khz = min(max_bandwidth1, max_bandwidth2);

	intersected_rule->flags = rule1->flags | rule2->flags;

	/*
	 * In case NL80211_RRF_AUTO_BW requested for both rules
	 * set AUTO_BW in intersected rule also. Next we will
	 * calculate BW correctly in handle_channel function.
	 * In other case remove AUTO_BW flag while we calculate
	 * maximum bandwidth correctly and auto calculation is
	 * not required.
	 */
	if ((rule1->flags & NL80211_RRF_AUTO_BW) &&
	    (rule2->flags & NL80211_RRF_AUTO_BW))
		intersected_rule->flags |= NL80211_RRF_AUTO_BW;
	else
		intersected_rule->flags &= ~NL80211_RRF_AUTO_BW;

	freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
	if (freq_range->max_bandwidth_khz > freq_diff)
		freq_range->max_bandwidth_khz = freq_diff;

	power_rule->max_eirp = min(power_rule1->max_eirp,
		power_rule2->max_eirp);
	power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
		power_rule2->max_antenna_gain);

	intersected_rule->dfs_cac_ms = max(rule1->dfs_cac_ms,
					   rule2->dfs_cac_ms);

	if (!is_valid_reg_rule(intersected_rule))
		return -EINVAL;

	return 0;
}

/* check whether old rule contains new rule */
static bool rule_contains(struct ieee80211_reg_rule *r1,
			  struct ieee80211_reg_rule *r2)
{
	/* for simplicity, currently consider only same flags */
	if (r1->flags != r2->flags)
		return false;

	/* verify r1 is more restrictive */
	if ((r1->power_rule.max_antenna_gain >
	     r2->power_rule.max_antenna_gain) ||
	    r1->power_rule.max_eirp > r2->power_rule.max_eirp)
		return false;

	/* make sure r2's range is contained within r1 */
	if (r1->freq_range.start_freq_khz > r2->freq_range.start_freq_khz ||
	    r1->freq_range.end_freq_khz < r2->freq_range.end_freq_khz)
		return false;

	/* and finally verify that r1.max_bw >= r2.max_bw */
	if (r1->freq_range.max_bandwidth_khz <
	    r2->freq_range.max_bandwidth_khz)
		return false;

	return true;
}

/* add or extend current rules. do nothing if rule is already contained */
static void add_rule(struct ieee80211_reg_rule *rule,
		     struct ieee80211_reg_rule *reg_rules, u32 *n_rules)
{
	struct ieee80211_reg_rule *tmp_rule;
	int i;

	for (i = 0; i < *n_rules; i++) {
		tmp_rule = &reg_rules[i];
		/* rule is already contained - do nothing */
		if (rule_contains(tmp_rule, rule))
			return;

		/* extend rule if possible */
		if (rule_contains(rule, tmp_rule)) {
			memcpy(tmp_rule, rule, sizeof(*rule));
			return;
		}
	}

	memcpy(&reg_rules[*n_rules], rule, sizeof(*rule));
	(*n_rules)++;
}

/**
 * regdom_intersect - do the intersection between two regulatory domains
 * @rd1: first regulatory domain
 * @rd2: second regulatory domain
 *
 * Use this function to get the intersection between two regulatory domains.
 * Once completed we will mark the alpha2 for the rd as intersected, "98",
 * as no one single alpha2 can represent this regulatory domain.
 *
 * Returns a pointer to the regulatory domain structure which will hold the
 * resulting intersection of rules between rd1 and rd2. We will
 * kzalloc() this structure for you.
 */
static struct ieee80211_regdomain *
regdom_intersect(const struct ieee80211_regdomain *rd1,
		 const struct ieee80211_regdomain *rd2)
{
	int r, size_of_regd;
	unsigned int x, y;
	unsigned int num_rules = 0;
	const struct ieee80211_reg_rule *rule1, *rule2;
	struct ieee80211_reg_rule intersected_rule;
	struct ieee80211_regdomain *rd;

	if (!rd1 || !rd2)
		return NULL;

	/*
	 * First we get a count of the rules we'll need, then we actually
	 * build them. This is to so we can malloc() and free() a
	 * regdomain once. The reason we use reg_rules_intersect() here
	 * is it will return -EINVAL if the rule computed makes no sense.
	 * All rules that do check out OK are valid.
	 */

	for (x = 0; x < rd1->n_reg_rules; x++) {
		rule1 = &rd1->reg_rules[x];
		for (y = 0; y < rd2->n_reg_rules; y++) {
			rule2 = &rd2->reg_rules[y];
			if (!reg_rules_intersect(rd1, rd2, rule1, rule2,
						 &intersected_rule))
				num_rules++;
		}
	}

	if (!num_rules)
		return NULL;

	size_of_regd = sizeof(struct ieee80211_regdomain) +
		       num_rules * sizeof(struct ieee80211_reg_rule);

	rd = kzalloc(size_of_regd, GFP_KERNEL);
	if (!rd)
		return NULL;

	for (x = 0; x < rd1->n_reg_rules; x++) {
		rule1 = &rd1->reg_rules[x];
		for (y = 0; y < rd2->n_reg_rules; y++) {
			rule2 = &rd2->reg_rules[y];
			r = reg_rules_intersect(rd1, rd2, rule1, rule2,
						&intersected_rule);
			/*
			 * No need to memset here the intersected rule here as
			 * we're not using the stack anymore
			 */
			if (r)
				continue;

			add_rule(&intersected_rule, rd->reg_rules,
				 &rd->n_reg_rules);
		}
	}

	rd->alpha2[0] = '9';
	rd->alpha2[1] = '8';
	rd->dfs_region = reg_intersect_dfs_region(rd1->dfs_region,
						  rd2->dfs_region);

	return rd;
}

/*
 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
 * want to just have the channel structure use these
 */
static u32 map_regdom_flags(u32 rd_flags)
{
	u32 channel_flags = 0;
	if (rd_flags & NL80211_RRF_NO_IR_ALL)
		channel_flags |= IEEE80211_CHAN_NO_IR;
	if (rd_flags & NL80211_RRF_DFS)
		channel_flags |= IEEE80211_CHAN_RADAR;
	if (rd_flags & NL80211_RRF_NO_OFDM)
		channel_flags |= IEEE80211_CHAN_NO_OFDM;
	if (rd_flags & NL80211_RRF_NO_OUTDOOR)
		channel_flags |= IEEE80211_CHAN_INDOOR_ONLY;
	if (rd_flags & NL80211_RRF_IR_CONCURRENT)
		channel_flags |= IEEE80211_CHAN_IR_CONCURRENT;
	if (rd_flags & NL80211_RRF_NO_HT40MINUS)
		channel_flags |= IEEE80211_CHAN_NO_HT40MINUS;
	if (rd_flags & NL80211_RRF_NO_HT40PLUS)
		channel_flags |= IEEE80211_CHAN_NO_HT40PLUS;
	if (rd_flags & NL80211_RRF_NO_80MHZ)
		channel_flags |= IEEE80211_CHAN_NO_80MHZ;
	if (rd_flags & NL80211_RRF_NO_160MHZ)
		channel_flags |= IEEE80211_CHAN_NO_160MHZ;
	return channel_flags;
}

static const struct ieee80211_reg_rule *
freq_reg_info_regd(u32 center_freq,
		   const struct ieee80211_regdomain *regd, u32 bw)
{
	int i;
	bool band_rule_found = false;
	bool bw_fits = false;

	if (!regd)
		return ERR_PTR(-EINVAL);

	for (i = 0; i < regd->n_reg_rules; i++) {
		const struct ieee80211_reg_rule *rr;
		const struct ieee80211_freq_range *fr = NULL;

		rr = &regd->reg_rules[i];
		fr = &rr->freq_range;

		/*
		 * We only need to know if one frequency rule was
		 * was in center_freq's band, that's enough, so lets
		 * not overwrite it once found
		 */
		if (!band_rule_found)
			band_rule_found = freq_in_rule_band(fr, center_freq);

		bw_fits = cfg80211_does_bw_fit_range(fr, center_freq, bw);

		if (band_rule_found && bw_fits)
			return rr;
	}

	if (!band_rule_found)
		return ERR_PTR(-ERANGE);

	return ERR_PTR(-EINVAL);
}

static const struct ieee80211_reg_rule *
__freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 min_bw)
{
	const struct ieee80211_regdomain *regd = reg_get_regdomain(wiphy);
	const struct ieee80211_reg_rule *reg_rule = NULL;
	u32 bw;

	for (bw = MHZ_TO_KHZ(20); bw >= min_bw; bw = bw / 2) {
		reg_rule = freq_reg_info_regd(center_freq, regd, bw);
		if (!IS_ERR(reg_rule))
			return reg_rule;
	}

	return reg_rule;
}

const struct ieee80211_reg_rule *freq_reg_info(struct wiphy *wiphy,
					       u32 center_freq)
{
	return __freq_reg_info(wiphy, center_freq, MHZ_TO_KHZ(20));
}
EXPORT_SYMBOL(freq_reg_info);

const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
{
	switch (initiator) {
	case NL80211_REGDOM_SET_BY_CORE:
		return "core";
	case NL80211_REGDOM_SET_BY_USER:
		return "user";
	case NL80211_REGDOM_SET_BY_DRIVER:
		return "driver";
	case NL80211_REGDOM_SET_BY_COUNTRY_IE:
		return "country element";
	default:
		WARN_ON(1);
		return "bug";
	}
}
EXPORT_SYMBOL(reg_initiator_name);

static uint32_t reg_rule_to_chan_bw_flags(const struct ieee80211_regdomain *regd,
					  const struct ieee80211_reg_rule *reg_rule,
					  const struct ieee80211_channel *chan)
{
	const struct ieee80211_freq_range *freq_range = NULL;
	u32 max_bandwidth_khz, bw_flags = 0;

	freq_range = &reg_rule->freq_range;

	max_bandwidth_khz = freq_range->max_bandwidth_khz;
	/* Check if auto calculation requested */
	if (reg_rule->flags & NL80211_RRF_AUTO_BW)
		max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule);

	/* If we get a reg_rule we can assume that at least 5Mhz fit */
	if (!cfg80211_does_bw_fit_range(freq_range,
					MHZ_TO_KHZ(chan->center_freq),
					MHZ_TO_KHZ(10)))
		bw_flags |= IEEE80211_CHAN_NO_10MHZ;
	if (!cfg80211_does_bw_fit_range(freq_range,
					MHZ_TO_KHZ(chan->center_freq),
					MHZ_TO_KHZ(20)))
		bw_flags |= IEEE80211_CHAN_NO_20MHZ;

	if (max_bandwidth_khz < MHZ_TO_KHZ(10))
		bw_flags |= IEEE80211_CHAN_NO_10MHZ;
	if (max_bandwidth_khz < MHZ_TO_KHZ(20))
		bw_flags |= IEEE80211_CHAN_NO_20MHZ;
	if (max_bandwidth_khz < MHZ_TO_KHZ(40))
		bw_flags |= IEEE80211_CHAN_NO_HT40;
	if (max_bandwidth_khz < MHZ_TO_KHZ(80))
		bw_flags |= IEEE80211_CHAN_NO_80MHZ;
	if (max_bandwidth_khz < MHZ_TO_KHZ(160))
		bw_flags |= IEEE80211_CHAN_NO_160MHZ;
	return bw_flags;
}

/*
 * Note that right now we assume the desired channel bandwidth
 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
 * per channel, the primary and the extension channel).
 */
static void handle_channel(struct wiphy *wiphy,
			   enum nl80211_reg_initiator initiator,
			   struct ieee80211_channel *chan)
{
	u32 flags, bw_flags = 0;
	const struct ieee80211_reg_rule *reg_rule = NULL;
	const struct ieee80211_power_rule *power_rule = NULL;
	struct wiphy *request_wiphy = NULL;
	struct regulatory_request *lr = get_last_request();
	const struct ieee80211_regdomain *regd;

	request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);

	flags = chan->orig_flags;

	reg_rule = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq));
	if (IS_ERR(reg_rule)) {
		/*
		 * We will disable all channels that do not match our
		 * received regulatory rule unless the hint is coming
		 * from a Country IE and the Country IE had no information
		 * about a band. The IEEE 802.11 spec allows for an AP
		 * to send only a subset of the regulatory rules allowed,
		 * so an AP in the US that only supports 2.4 GHz may only send
		 * a country IE with information for the 2.4 GHz band
		 * while 5 GHz is still supported.
		 */
		if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
		    PTR_ERR(reg_rule) == -ERANGE)
			return;

		if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
		    request_wiphy && request_wiphy == wiphy &&
		    request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
			pr_debug("Disabling freq %d MHz for good\n",
				 chan->center_freq);
			chan->orig_flags |= IEEE80211_CHAN_DISABLED;
			chan->flags = chan->orig_flags;
		} else {
			pr_debug("Disabling freq %d MHz\n",
				 chan->center_freq);
			chan->flags |= IEEE80211_CHAN_DISABLED;
		}
		return;
	}

	regd = reg_get_regdomain(wiphy);

	power_rule = &reg_rule->power_rule;
	bw_flags = reg_rule_to_chan_bw_flags(regd, reg_rule, chan);

	if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
	    request_wiphy && request_wiphy == wiphy &&
	    request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
		/*
		 * This guarantees the driver's requested regulatory domain
		 * will always be used as a base for further regulatory
		 * settings
		 */
		chan->flags = chan->orig_flags =
			map_regdom_flags(reg_rule->flags) | bw_flags;
		chan->max_antenna_gain = chan->orig_mag =
			(int) MBI_TO_DBI(power_rule->max_antenna_gain);
		chan->max_reg_power = chan->max_power = chan->orig_mpwr =
			(int) MBM_TO_DBM(power_rule->max_eirp);

		if (chan->flags & IEEE80211_CHAN_RADAR) {
			chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
			if (reg_rule->dfs_cac_ms)
				chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
		}

		return;
	}

	chan->dfs_state = NL80211_DFS_USABLE;
	chan->dfs_state_entered = jiffies;

	chan->beacon_found = false;
	chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
	chan->max_antenna_gain =
		min_t(int, chan->orig_mag,
		      MBI_TO_DBI(power_rule->max_antenna_gain));
	chan->max_reg_power = (int) MBM_TO_DBM(power_rule->max_eirp);

	if (chan->flags & IEEE80211_CHAN_RADAR) {
		if (reg_rule->dfs_cac_ms)
			chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
		else
			chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
	}

	if (chan->orig_mpwr) {
		/*
		 * Devices that use REGULATORY_COUNTRY_IE_FOLLOW_POWER
		 * will always follow the passed country IE power settings.
		 */
		if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
		    wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_FOLLOW_POWER)
			chan->max_power = chan->max_reg_power;
		else
			chan->max_power = min(chan->orig_mpwr,
					      chan->max_reg_power);
	} else
		chan->max_power = chan->max_reg_power;
}

static void handle_band(struct wiphy *wiphy,
			enum nl80211_reg_initiator initiator,
			struct ieee80211_supported_band *sband)
{
	unsigned int i;

	if (!sband)
		return;

	for (i = 0; i < sband->n_channels; i++)
		handle_channel(wiphy, initiator, &sband->channels[i]);
}

static bool reg_request_cell_base(struct regulatory_request *request)
{
	if (request->initiator != NL80211_REGDOM_SET_BY_USER)
		return false;
	return request->user_reg_hint_type == NL80211_USER_REG_HINT_CELL_BASE;
}

bool reg_last_request_cell_base(void)
{
	return reg_request_cell_base(get_last_request());
}

#ifdef CONFIG_CFG80211_REG_CELLULAR_HINTS
/* Core specific check */
static enum reg_request_treatment
reg_ignore_cell_hint(struct regulatory_request *pending_request)
{
	struct regulatory_request *lr = get_last_request();

	if (!reg_num_devs_support_basehint)
		return REG_REQ_IGNORE;

	if (reg_request_cell_base(lr) &&
	    !regdom_changes(pending_request->alpha2))
		return REG_REQ_ALREADY_SET;

	return REG_REQ_OK;
}

/* Device specific check */
static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
{
	return !(wiphy->features & NL80211_FEATURE_CELL_BASE_REG_HINTS);
}
#else
static enum reg_request_treatment
reg_ignore_cell_hint(struct regulatory_request *pending_request)
{
	return REG_REQ_IGNORE;
}

static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
{
	return true;
}
#endif

static bool wiphy_strict_alpha2_regd(struct wiphy *wiphy)
{
	if (wiphy->regulatory_flags & REGULATORY_STRICT_REG &&
	    !(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG))
		return true;
	return false;
}

static bool ignore_reg_update(struct wiphy *wiphy,
			      enum nl80211_reg_initiator initiator)
{
	struct regulatory_request *lr = get_last_request();

	if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
		return true;

	if (!lr) {
		pr_debug("Ignoring regulatory request set by %s since last_request is not set\n",
			 reg_initiator_name(initiator));
		return true;
	}

	if (initiator == NL80211_REGDOM_SET_BY_CORE &&
	    wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
		pr_debug("Ignoring regulatory request set by %s since the driver uses its own custom regulatory domain\n",
			 reg_initiator_name(initiator));
		return true;
	}

	/*
	 * wiphy->regd will be set once the device has its own
	 * desired regulatory domain set
	 */
	if (wiphy_strict_alpha2_regd(wiphy) && !wiphy->regd &&
	    initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
	    !is_world_regdom(lr->alpha2)) {
		pr_debug("Ignoring regulatory request set by %s since the driver requires its own regulatory domain to be set first\n",
			 reg_initiator_name(initiator));
		return true;
	}

	if (reg_request_cell_base(lr))
		return reg_dev_ignore_cell_hint(wiphy);

	return false;
}

static bool reg_is_world_roaming(struct wiphy *wiphy)
{
	const struct ieee80211_regdomain *cr = get_cfg80211_regdom();
	const struct ieee80211_regdomain *wr = get_wiphy_regdom(wiphy);
	struct regulatory_request *lr = get_last_request();

	if (is_world_regdom(cr->alpha2) || (wr && is_world_regdom(wr->alpha2)))
		return true;

	if (lr && lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
	    wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)
		return true;

	return false;
}

static void handle_reg_beacon(struct wiphy *wiphy, unsigned int chan_idx,
			      struct reg_beacon *reg_beacon)
{
	struct ieee80211_supported_band *sband;
	struct ieee80211_channel *chan;
	bool channel_changed = false;
	struct ieee80211_channel chan_before;

	sband = wiphy->bands[reg_beacon->chan.band];
	chan = &sband->channels[chan_idx];

	if (likely(chan->center_freq != reg_beacon->chan.center_freq))
		return;

	if (chan->beacon_found)
		return;

	chan->beacon_found = true;

	if (!reg_is_world_roaming(wiphy))
		return;

	if (wiphy->regulatory_flags & REGULATORY_DISABLE_BEACON_HINTS)
		return;

	chan_before = *chan;

	if (chan->flags & IEEE80211_CHAN_NO_IR) {
		chan->flags &= ~IEEE80211_CHAN_NO_IR;
		channel_changed = true;
	}

	if (channel_changed)
		nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
}

/*
 * Called when a scan on a wiphy finds a beacon on
 * new channel
 */
static void wiphy_update_new_beacon(struct wiphy *wiphy,
				    struct reg_beacon *reg_beacon)
{
	unsigned int i;
	struct ieee80211_supported_band *sband;

	if (!wiphy->bands[reg_beacon->chan.band])
		return;

	sband = wiphy->bands[reg_beacon->chan.band];

	for (i = 0; i < sband->n_channels; i++)
		handle_reg_beacon(wiphy, i, reg_beacon);
}

/*
 * Called upon reg changes or a new wiphy is added
 */
static void wiphy_update_beacon_reg(struct wiphy *wiphy)
{
	unsigned int i;
	struct ieee80211_supported_band *sband;
	struct reg_beacon *reg_beacon;

	list_for_each_entry(reg_beacon, &reg_beacon_list, list) {
		if (!wiphy->bands[reg_beacon->chan.band])
			continue;
		sband = wiphy->bands[reg_beacon->chan.band];
		for (i = 0; i < sband->n_channels; i++)
			handle_reg_beacon(wiphy, i, reg_beacon);
	}
}

/* Reap the advantages of previously found beacons */
static void reg_process_beacons(struct wiphy *wiphy)
{
	/*
	 * Means we are just firing up cfg80211, so no beacons would
	 * have been processed yet.
	 */
	if (!last_request)
		return;
	wiphy_update_beacon_reg(wiphy);
}

static bool is_ht40_allowed(struct ieee80211_channel *chan)
{
	if (!chan)
		return false;
	if (chan->flags & IEEE80211_CHAN_DISABLED)
		return false;
	/* This would happen when regulatory rules disallow HT40 completely */
	if ((chan->flags & IEEE80211_CHAN_NO_HT40) == IEEE80211_CHAN_NO_HT40)
		return false;
	return true;
}

static void reg_process_ht_flags_channel(struct wiphy *wiphy,
					 struct ieee80211_channel *channel)
{
	struct ieee80211_supported_band *sband = wiphy->bands[channel->band];
	struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
	const struct ieee80211_regdomain *regd;
	unsigned int i;
	u32 flags;

	if (!is_ht40_allowed(channel)) {
		channel->flags |= IEEE80211_CHAN_NO_HT40;
		return;
	}

	/*
	 * We need to ensure the extension channels exist to
	 * be able to use HT40- or HT40+, this finds them (or not)
	 */
	for (i = 0; i < sband->n_channels; i++) {
		struct ieee80211_channel *c = &sband->channels[i];

		if (c->center_freq == (channel->center_freq - 20))
			channel_before = c;
		if (c->center_freq == (channel->center_freq + 20))
			channel_after = c;
	}

	flags = 0;
	regd = get_wiphy_regdom(wiphy);
	if (regd) {
		const struct ieee80211_reg_rule *reg_rule =
			freq_reg_info_regd(MHZ_TO_KHZ(channel->center_freq),
					   regd, MHZ_TO_KHZ(20));

		if (!IS_ERR(reg_rule))
			flags = reg_rule->flags;
	}

	/*
	 * Please note that this assumes target bandwidth is 20 MHz,
	 * if that ever changes we also need to change the below logic
	 * to include that as well.
	 */
	if (!is_ht40_allowed(channel_before) ||
	    flags & NL80211_RRF_NO_HT40MINUS)
		channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
	else
		channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;

	if (!is_ht40_allowed(channel_after) ||
	    flags & NL80211_RRF_NO_HT40PLUS)
		channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
	else
		channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
}

static void reg_process_ht_flags_band(struct wiphy *wiphy,
				      struct ieee80211_supported_band *sband)
{
	unsigned int i;

	if (!sband)
		return;

	for (i = 0; i < sband->n_channels; i++)
		reg_process_ht_flags_channel(wiphy, &sband->channels[i]);
}

static void reg_process_ht_flags(struct wiphy *wiphy)
{
	enum nl80211_band band;

	if (!wiphy)
		return;

	for (band = 0; band < NUM_NL80211_BANDS; band++)
		reg_process_ht_flags_band(wiphy, wiphy->bands[band]);
}

static void reg_call_notifier(struct wiphy *wiphy,
			      struct regulatory_request *request)
{
	if (wiphy->reg_notifier)
		wiphy->reg_notifier(wiphy, request);
}

static bool reg_wdev_chan_valid(struct wiphy *wiphy, struct wireless_dev *wdev)
{
	struct cfg80211_chan_def chandef;
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
	enum nl80211_iftype iftype;

	wdev_lock(wdev);
	iftype = wdev->iftype;

	/* make sure the interface is active */
	if (!wdev->netdev || !netif_running(wdev->netdev))
		goto wdev_inactive_unlock;

	switch (iftype) {
	case NL80211_IFTYPE_AP:
	case NL80211_IFTYPE_P2P_GO:
		if (!wdev->beacon_interval)
			goto wdev_inactive_unlock;
		chandef = wdev->chandef;
		break;
	case NL80211_IFTYPE_ADHOC:
		if (!wdev->ssid_len)
			goto wdev_inactive_unlock;
		chandef = wdev->chandef;
		break;
	case NL80211_IFTYPE_STATION:
	case NL80211_IFTYPE_P2P_CLIENT:
		if (!wdev->current_bss ||
		    !wdev->current_bss->pub.channel)
			goto wdev_inactive_unlock;

		if (!rdev->ops->get_channel ||
		    rdev_get_channel(rdev, wdev, &chandef))
			cfg80211_chandef_create(&chandef,
						wdev->current_bss->pub.channel,
						NL80211_CHAN_NO_HT);
		break;
	case NL80211_IFTYPE_MONITOR:
	case NL80211_IFTYPE_AP_VLAN:
	case NL80211_IFTYPE_P2P_DEVICE:
		/* no enforcement required */
		break;
	default:
		/* others not implemented for now */
		WARN_ON(1);
		break;
	}

	wdev_unlock(wdev);

	switch (iftype) {
	case NL80211_IFTYPE_AP:
	case NL80211_IFTYPE_P2P_GO:
	case NL80211_IFTYPE_ADHOC:
		return cfg80211_reg_can_beacon_relax(wiphy, &chandef, iftype);
	case NL80211_IFTYPE_STATION:
	case NL80211_IFTYPE_P2P_CLIENT:
		return cfg80211_chandef_usable(wiphy, &chandef,
					       IEEE80211_CHAN_DISABLED);
	default:
		break;
	}

	return true;

wdev_inactive_unlock:
	wdev_unlock(wdev);
	return true;
}

static void reg_leave_invalid_chans(struct wiphy *wiphy)
{
	struct wireless_dev *wdev;
	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);

	ASSERT_RTNL();

	list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
		if (!reg_wdev_chan_valid(wiphy, wdev))
			cfg80211_leave(rdev, wdev);
}

static void reg_check_chans_work(struct work_struct *work)
{
	struct cfg80211_registered_device *rdev;

	pr_debug("Verifying active interfaces after reg change\n");
	rtnl_lock();

	list_for_each_entry(rdev, &cfg80211_rdev_list, list)
		if (!(rdev->wiphy.regulatory_flags &
		      REGULATORY_IGNORE_STALE_KICKOFF))
			reg_leave_invalid_chans(&rdev->wiphy);

	rtnl_unlock();
}

static void reg_check_channels(void)
{
	/*
	 * Give usermode a chance to do something nicer (move to another
	 * channel, orderly disconnection), before forcing a disconnection.
	 */
	mod_delayed_work(system_power_efficient_wq,
			 &reg_check_chans,
			 msecs_to_jiffies(REG_ENFORCE_GRACE_MS));
}

static void wiphy_update_regulatory(struct wiphy *wiphy,
				    enum nl80211_reg_initiator initiator)
{
	enum nl80211_band band;
	struct regulatory_request *lr = get_last_request();

	if (ignore_reg_update(wiphy, initiator)) {
		/*
		 * Regulatory updates set by CORE are ignored for custom
		 * regulatory cards. Let us notify the changes to the driver,
		 * as some drivers used this to restore its orig_* reg domain.
		 */
		if (initiator == NL80211_REGDOM_SET_BY_CORE &&
		    wiphy->regulatory_flags & REGULATORY_CUSTOM_REG &&
		    !(wiphy->regulatory_flags &
		      REGULATORY_WIPHY_SELF_MANAGED))
			reg_call_notifier(wiphy, lr);
		return;
	}

	lr->dfs_region = get_cfg80211_regdom()->dfs_region;

	for (band = 0; band < NUM_NL80211_BANDS; band++)
		handle_band(wiphy, initiator, wiphy->bands[band]);

	reg_process_beacons(wiphy);
	reg_process_ht_flags(wiphy);
	reg_call_notifier(wiphy, lr);
}

static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
{
	struct cfg80211_registered_device *rdev;
	struct wiphy *wiphy;

	ASSERT_RTNL();

	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
		wiphy = &rdev->wiphy;
		wiphy_update_regulatory(wiphy, initiator);
	}

	reg_check_channels();
}

static void handle_channel_custom(struct wiphy *wiphy,
				  struct ieee80211_channel *chan,
				  const struct ieee80211_regdomain *regd)
{
	u32 bw_flags = 0;
	const struct ieee80211_reg_rule *reg_rule = NULL;
	const struct ieee80211_power_rule *power_rule = NULL;
	u32 bw;

	for (bw = MHZ_TO_KHZ(20); bw >= MHZ_TO_KHZ(5); bw = bw / 2) {
		reg_rule = freq_reg_info_regd(MHZ_TO_KHZ(chan->center_freq),
					      regd, bw);
		if (!IS_ERR(reg_rule))
			break;
	}

	if (IS_ERR(reg_rule)) {
		pr_debug("Disabling freq %d MHz as custom regd has no rule that fits it\n",
			 chan->center_freq);
		if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) {
			chan->flags |= IEEE80211_CHAN_DISABLED;
		} else {
			chan->orig_flags |= IEEE80211_CHAN_DISABLED;
			chan->flags = chan->orig_flags;
		}
		return;
	}

	power_rule = &reg_rule->power_rule;
	bw_flags = reg_rule_to_chan_bw_flags(regd, reg_rule, chan);

	chan->dfs_state_entered = jiffies;
	chan->dfs_state = NL80211_DFS_USABLE;

	chan->beacon_found = false;

	if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
		chan->flags = chan->orig_flags | bw_flags |
			      map_regdom_flags(reg_rule->flags);
	else
		chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;

	chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
	chan->max_reg_power = chan->max_power =
		(int) MBM_TO_DBM(power_rule->max_eirp);

	if (chan->flags & IEEE80211_CHAN_RADAR) {
		if (reg_rule->dfs_cac_ms)
			chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
		else
			chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
	}

	chan->max_power = chan->max_reg_power;
}

static void handle_band_custom(struct wiphy *wiphy,
			       struct ieee80211_supported_band *sband,
			       const struct ieee80211_regdomain *regd)
{
	unsigned int i;

	if (!sband)
		return;

	for (i = 0; i < sband->n_channels; i++)
		handle_channel_custom(wiphy, &sband->channels[i], regd);
}

/* Used by drivers prior to wiphy registration */
void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
				   const struct ieee80211_regdomain *regd)
{
	enum nl80211_band band;
	unsigned int bands_set = 0;

	WARN(!(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG),
	     "wiphy should have REGULATORY_CUSTOM_REG\n");
	wiphy->regulatory_flags |= REGULATORY_CUSTOM_REG;

	for (band = 0; band < NUM_NL80211_BANDS; band++) {
		if (!wiphy->bands[band])
			continue;
		handle_band_custom(wiphy, wiphy->bands[band], regd);
		bands_set++;
	}

	/*
	 * no point in calling this if it won't have any effect
	 * on your device's supported bands.
	 */
	WARN_ON(!bands_set);
}
EXPORT_SYMBOL(wiphy_apply_custom_regulatory);

static void reg_set_request_processed(void)
{
	bool need_more_processing = false;
	struct regulatory_request *lr = get_last_request();

	lr->processed = true;

	spin_lock(&reg_requests_lock);
	if (!list_empty(&reg_requests_list))
		need_more_processing = true;
	spin_unlock(&reg_requests_lock);

	cancel_crda_timeout();

	if (need_more_processing)
		schedule_work(&reg_work);
}

/**
 * reg_process_hint_core - process core regulatory requests
 * @pending_request: a pending core regulatory request
 *
 * The wireless subsystem can use this function to process
 * a regulatory request issued by the regulatory core.
 */
static enum reg_request_treatment
reg_process_hint_core(struct regulatory_request *core_request)
{
	if (reg_query_database(core_request)) {
		core_request->intersect = false;
		core_request->processed = false;
		reg_update_last_request(core_request);
		return REG_REQ_OK;
	}

	return REG_REQ_IGNORE;
}

static enum reg_request_treatment
__reg_process_hint_user(struct regulatory_request *user_request)
{
	struct regulatory_request *lr = get_last_request();

	if (reg_request_cell_base(user_request))
		return reg_ignore_cell_hint(user_request);

	if (reg_request_cell_base(lr))
		return REG_REQ_IGNORE;

	if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
		return REG_REQ_INTERSECT;
	/*
	 * If the user knows better the user should set the regdom
	 * to their country before the IE is picked up
	 */
	if (lr->initiator == NL80211_REGDOM_SET_BY_USER &&
	    lr->intersect)
		return REG_REQ_IGNORE;
	/*
	 * Process user requests only after previous user/driver/core
	 * requests have been processed
	 */
	if ((lr->initiator == NL80211_REGDOM_SET_BY_CORE ||
	     lr->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
	     lr->initiator == NL80211_REGDOM_SET_BY_USER) &&
	    regdom_changes(lr->alpha2))
		return REG_REQ_IGNORE;

	if (!regdom_changes(user_request->alpha2))
		return REG_REQ_ALREADY_SET;

	return REG_REQ_OK;
}

/**
 * reg_process_hint_user - process user regulatory requests
 * @user_request: a pending user regulatory request
 *
 * The wireless subsystem can use this function to process
 * a regulatory request initiated by userspace.
 */
static enum reg_request_treatment
reg_process_hint_user(struct regulatory_request *user_request)
{
	enum reg_request_treatment treatment;

	treatment = __reg_process_hint_user(user_request);
	if (treatment == REG_REQ_IGNORE ||
	    treatment == REG_REQ_ALREADY_SET)
		return REG_REQ_IGNORE;

	user_request->intersect = treatment == REG_REQ_INTERSECT;
	user_request->processed = false;

	if (reg_query_database(user_request)) {
		reg_update_last_request(user_request);
		user_alpha2[0] = user_request->alpha2[0];
		user_alpha2[1] = user_request->alpha2[1];
		return REG_REQ_OK;
	}

	return REG_REQ_IGNORE;
}

static enum reg_request_treatment
__reg_process_hint_driver(struct regulatory_request *driver_request)
{
	struct regulatory_request *lr = get_last_request();

	if (lr->initiator == NL80211_REGDOM_SET_BY_CORE) {
		if (regdom_changes(driver_request->alpha2))
			return REG_REQ_OK;
		return REG_REQ_ALREADY_SET;
	}

	/*
	 * This would happen if you unplug and plug your card
	 * back in or if you add a new device for which the previously
	 * loaded card also agrees on the regulatory domain.
	 */
	if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
	    !regdom_changes(driver_request->alpha2))
		return REG_REQ_ALREADY_SET;

	return REG_REQ_INTERSECT;
}

/**
 * reg_process_hint_driver - process driver regulatory requests
 * @driver_request: a pending driver regulatory request
 *
 * The wireless subsystem can use this function to process
 * a regulatory request issued by an 802.11 driver.
 *
 * Returns one of the different reg request treatment values.
 */
static enum reg_request_treatment
reg_process_hint_driver(struct wiphy *wiphy,
			struct regulatory_request *driver_request)
{
	const struct ieee80211_regdomain *regd, *tmp;
	enum reg_request_treatment treatment;

	treatment = __reg_process_hint_driver(driver_request);

	switch (treatment) {
	case REG_REQ_OK:
		break;
	case REG_REQ_IGNORE:
		return REG_REQ_IGNORE;
	case REG_REQ_INTERSECT:
	case REG_REQ_ALREADY_SET:
		regd = reg_copy_regd(get_cfg80211_regdom());
		if (IS_ERR(regd))
			return REG_REQ_IGNORE;

		tmp = get_wiphy_regdom(wiphy);
		rcu_assign_pointer(wiphy->regd, regd);
		rcu_free_regdom(tmp);
	}


	driver_request->intersect = treatment == REG_REQ_INTERSECT;
	driver_request->processed = false;

	/*
	 * Since CRDA will not be called in this case as we already
	 * have applied the requested regulatory domain before we just
	 * inform userspace we have processed the request
	 */
	if (treatment == REG_REQ_ALREADY_SET) {
		nl80211_send_reg_change_event(driver_request);
		reg_update_last_request(driver_request);
		reg_set_request_processed();
		return REG_REQ_ALREADY_SET;
	}

	if (reg_query_database(driver_request)) {
		reg_update_last_request(driver_request);
		return REG_REQ_OK;
	}

	return REG_REQ_IGNORE;
}

static enum reg_request_treatment
__reg_process_hint_country_ie(struct wiphy *wiphy,
			      struct regulatory_request *country_ie_request)
{
	struct wiphy *last_wiphy = NULL;
	struct regulatory_request *lr = get_last_request();

	if (reg_request_cell_base(lr)) {
		/* Trust a Cell base station over the AP's country IE */
		if (regdom_changes(country_ie_request->alpha2))
			return REG_REQ_IGNORE;
		return REG_REQ_ALREADY_SET;
	} else {
		if (wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_IGNORE)
			return REG_REQ_IGNORE;
	}

	if (unlikely(!is_an_alpha2(country_ie_request->alpha2)))
		return -EINVAL;

	if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE)
		return REG_REQ_OK;

	last_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);

	if (last_wiphy != wiphy) {
		/*
		 * Two cards with two APs claiming different
		 * Country IE alpha2s. We could
		 * intersect them, but that seems unlikely
		 * to be correct. Reject second one for now.
		 */
		if (regdom_changes(country_ie_request->alpha2))
			return REG_REQ_IGNORE;
		return REG_REQ_ALREADY_SET;
	}

	if (regdom_changes(country_ie_request->alpha2))
		return REG_REQ_OK;
	return REG_REQ_ALREADY_SET;
}

/**
 * reg_process_hint_country_ie - process regulatory requests from country IEs
 * @country_ie_request: a regulatory request from a country IE
 *
 * The wireless subsystem can use this function to process
 * a regulatory request issued by a country Information Element.
 *
 * Returns one of the different reg request treatment values.
 */
static enum reg_request_treatment
reg_process_hint_country_ie(struct wiphy *wiphy,
			    struct regulatory_request *country_ie_request)
{
	enum reg_request_treatment treatment;

	treatment = __reg_process_hint_country_ie(wiphy, country_ie_request);

	switch (treatment) {
	case REG_REQ_OK:
		break;
	case REG_REQ_IGNORE:
		return REG_REQ_IGNORE;
	case REG_REQ_ALREADY_SET:
		reg_free_request(country_ie_request);
		return REG_REQ_ALREADY_SET;
	case REG_REQ_INTERSECT:
		/*
		 * This doesn't happen yet, not sure we
		 * ever want to support it for this case.
		 */
		WARN_ONCE(1, "Unexpected intersection for country elements");
		return REG_REQ_IGNORE;
	}

	country_ie_request->intersect = false;
	country_ie_request->processed = false;

	if (reg_query_database(country_ie_request)) {
		reg_update_last_request(country_ie_request);
		return REG_REQ_OK;
	}

	return REG_REQ_IGNORE;
}

bool reg_dfs_domain_same(struct wiphy *wiphy1, struct wiphy *wiphy2)
{
	const struct ieee80211_regdomain *wiphy1_regd = NULL;
	const struct ieee80211_regdomain *wiphy2_regd = NULL;
	const struct ieee80211_regdomain *cfg80211_regd = NULL;
	bool dfs_domain_same;

	rcu_read_lock();

	cfg80211_regd = rcu_dereference(cfg80211_regdomain);
	wiphy1_regd = rcu_dereference(wiphy1->regd);
	if (!wiphy1_regd)
		wiphy1_regd = cfg80211_regd;

	wiphy2_regd = rcu_dereference(wiphy2->regd);
	if (!wiphy2_regd)
		wiphy2_regd = cfg80211_regd;

	dfs_domain_same = wiphy1_regd->dfs_region == wiphy2_regd->dfs_region;

	rcu_read_unlock();

	return dfs_domain_same;
}

static void reg_copy_dfs_chan_state(struct ieee80211_channel *dst_chan,
				    struct ieee80211_channel *src_chan)
{
	if (!(dst_chan->flags & IEEE80211_CHAN_RADAR) ||
	    !(src_chan->flags & IEEE80211_CHAN_RADAR))
		return;

	if (dst_chan->flags & IEEE80211_CHAN_DISABLED ||
	    src_chan->flags & IEEE80211_CHAN_DISABLED)
		return;

	if (src_chan->center_freq == dst_chan->center_freq &&
	    dst_chan->dfs_state == NL80211_DFS_USABLE) {
		dst_chan->dfs_state = src_chan->dfs_state;
		dst_chan->dfs_state_entered = src_chan->dfs_state_entered;
	}
}

static void wiphy_share_dfs_chan_state(struct wiphy *dst_wiphy,
				       struct wiphy *src_wiphy)
{
	struct ieee80211_supported_band *src_sband, *dst_sband;
	struct ieee80211_channel *src_chan, *dst_chan;
	int i, j, band;

	if (!reg_dfs_domain_same(dst_wiphy, src_wiphy))
		return;

	for (band = 0; band < NUM_NL80211_BANDS; band++) {
		dst_sband = dst_wiphy->bands[band];
		src_sband = src_wiphy->bands[band];
		if (!dst_sband || !src_sband)
			continue;

		for (i = 0; i < dst_sband->n_channels; i++) {
			dst_chan = &dst_sband->channels[i];
			for (j = 0; j < src_sband->n_channels; j++) {
				src_chan = &src_sband->channels[j];
				reg_copy_dfs_chan_state(dst_chan, src_chan);
			}
		}
	}
}

static void wiphy_all_share_dfs_chan_state(struct wiphy *wiphy)
{
	struct cfg80211_registered_device *rdev;

	ASSERT_RTNL();

	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
		if (wiphy == &rdev->wiphy)
			continue;
		wiphy_share_dfs_chan_state(wiphy, &rdev->wiphy);
	}
}

/* This processes *all* regulatory hints */
static void reg_process_hint(struct regulatory_request *reg_request)
{
	struct wiphy *wiphy = NULL;
	enum reg_request_treatment treatment;

	if (reg_request->wiphy_idx != WIPHY_IDX_INVALID)
		wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);

	switch (reg_request->initiator) {
	case NL80211_REGDOM_SET_BY_CORE:
		treatment = reg_process_hint_core(reg_request);
		break;
	case NL80211_REGDOM_SET_BY_USER:
		treatment = reg_process_hint_user(reg_request);
		break;
	case NL80211_REGDOM_SET_BY_DRIVER:
		if (!wiphy)
			goto out_free;
		treatment = reg_process_hint_driver(wiphy, reg_request);
		break;
	case NL80211_REGDOM_SET_BY_COUNTRY_IE:
		if (!wiphy)
			goto out_free;
		treatment = reg_process_hint_country_ie(wiphy, reg_request);
		break;
	default:
		WARN(1, "invalid initiator %d\n", reg_request->initiator);
		goto out_free;
	}

	if (treatment == REG_REQ_IGNORE)
		goto out_free;

	WARN(treatment != REG_REQ_OK && treatment != REG_REQ_ALREADY_SET,
	     "unexpected treatment value %d\n", treatment);

	/* This is required so that the orig_* parameters are saved.
	 * NOTE: treatment must be set for any case that reaches here!
	 */
	if (treatment == REG_REQ_ALREADY_SET && wiphy &&
	    wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
		wiphy_update_regulatory(wiphy, reg_request->initiator);
		wiphy_all_share_dfs_chan_state(wiphy);
		reg_check_channels();
	}

	return;

out_free:
	reg_free_request(reg_request);
}

static void notify_self_managed_wiphys(struct regulatory_request *request)
{
	struct cfg80211_registered_device *rdev;
	struct wiphy *wiphy;

	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
		wiphy = &rdev->wiphy;
		if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED &&
		    request->initiator == NL80211_REGDOM_SET_BY_USER &&
		    request->user_reg_hint_type ==
				NL80211_USER_REG_HINT_CELL_BASE)
			reg_call_notifier(wiphy, request);
	}
}

/*
 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
 * Regulatory hints come on a first come first serve basis and we
 * must process each one atomically.
 */
static void reg_process_pending_hints(void)
{
	struct regulatory_request *reg_request, *lr;

	lr = get_last_request();

	/* When last_request->processed becomes true this will be rescheduled */
	if (lr && !lr->processed) {
		reg_process_hint(lr);
		return;
	}

	spin_lock(&reg_requests_lock);

	if (list_empty(&reg_requests_list)) {
		spin_unlock(&reg_requests_lock);
		return;
	}

	reg_request = list_first_entry(&reg_requests_list,
				       struct regulatory_request,
				       list);
	list_del_init(&reg_request->list);

	spin_unlock(&reg_requests_lock);

	notify_self_managed_wiphys(reg_request);

	reg_process_hint(reg_request);

	lr = get_last_request();

	spin_lock(&reg_requests_lock);
	if (!list_empty(&reg_requests_list) && lr && lr->processed)
		schedule_work(&reg_work);
	spin_unlock(&reg_requests_lock);
}

/* Processes beacon hints -- this has nothing to do with country IEs */
static void reg_process_pending_beacon_hints(void)
{
	struct cfg80211_registered_device *rdev;
	struct reg_beacon *pending_beacon, *tmp;

	/* This goes through the _pending_ beacon list */
	spin_lock_bh(&reg_pending_beacons_lock);

	list_for_each_entry_safe(pending_beacon, tmp,
				 &reg_pending_beacons, list) {
		list_del_init(&pending_beacon->list);

		/* Applies the beacon hint to current wiphys */
		list_for_each_entry(rdev, &cfg80211_rdev_list, list)
			wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);

		/* Remembers the beacon hint for new wiphys or reg changes */
		list_add_tail(&pending_beacon->list, &reg_beacon_list);
	}

	spin_unlock_bh(&reg_pending_beacons_lock);
}

static void reg_process_self_managed_hints(void)
{
	struct cfg80211_registered_device *rdev;
	struct wiphy *wiphy;
	const struct ieee80211_regdomain *tmp;
	const struct ieee80211_regdomain *regd;
	enum nl80211_band band;
	struct regulatory_request request = {};

	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
		wiphy = &rdev->wiphy;

		spin_lock(&reg_requests_lock);
		regd = rdev->requested_regd;
		rdev->requested_regd = NULL;
		spin_unlock(&reg_requests_lock);

		if (regd == NULL)
			continue;

		tmp = get_wiphy_regdom(wiphy);
		rcu_assign_pointer(wiphy->regd, regd);
		rcu_free_regdom(tmp);

		for (band = 0; band < NUM_NL80211_BANDS; band++)
			handle_band_custom(wiphy, wiphy->bands[band], regd);

		reg_process_ht_flags(wiphy);

		request.wiphy_idx = get_wiphy_idx(wiphy);
		request.alpha2[0] = regd->alpha2[0];
		request.alpha2[1] = regd->alpha2[1];
		request.initiator = NL80211_REGDOM_SET_BY_DRIVER;

		nl80211_send_wiphy_reg_change_event(&request);
	}

	reg_check_channels();
}

static void reg_todo(struct work_struct *work)
{
	rtnl_lock();
	reg_process_pending_hints();
	reg_process_pending_beacon_hints();
	reg_process_self_managed_hints();
	rtnl_unlock();
}

static void queue_regulatory_request(struct regulatory_request *request)
{
	request->alpha2[0] = toupper(request->alpha2[0]);
	request->alpha2[1] = toupper(request->alpha2[1]);

	spin_lock(&reg_requests_lock);
	list_add_tail(&request->list, &reg_requests_list);
	spin_unlock(&reg_requests_lock);

	schedule_work(&reg_work);
}

/*
 * Core regulatory hint -- happens during cfg80211_init()
 * and when we restore regulatory settings.
 */
static int regulatory_hint_core(const char *alpha2)
{
	struct regulatory_request *request;

	request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
	if (!request)
		return -ENOMEM;

	request->alpha2[0] = alpha2[0];
	request->alpha2[1] = alpha2[1];
	request->initiator = NL80211_REGDOM_SET_BY_CORE;

	queue_regulatory_request(request);

	return 0;
}

/* User hints */
int regulatory_hint_user(const char *alpha2,
			 enum nl80211_user_reg_hint_type user_reg_hint_type)
{
	struct regulatory_request *request;

	if (WARN_ON(!alpha2))
		return -EINVAL;

	request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
	if (!request)
		return -ENOMEM;

	request->wiphy_idx = WIPHY_IDX_INVALID;
	request->alpha2[0] = alpha2[0];
	request->alpha2[1] = alpha2[1];
	request->initiator = NL80211_REGDOM_SET_BY_USER;
	request->user_reg_hint_type = user_reg_hint_type;

	/* Allow calling CRDA again */
	reset_crda_timeouts();

	queue_regulatory_request(request);

	return 0;
}

int regulatory_hint_indoor(bool is_indoor, u32 portid)
{
	spin_lock(&reg_indoor_lock);

	/* It is possible that more than one user space process is trying to
	 * configure the indoor setting. To handle such cases, clear the indoor
	 * setting in case that some process does not think that the device
	 * is operating in an indoor environment. In addition, if a user space
	 * process indicates that it is controlling the indoor setting, save its
	 * portid, i.e., make it the owner.
	 */
	reg_is_indoor = is_indoor;
	if (reg_is_indoor) {
		if (!reg_is_indoor_portid)
			reg_is_indoor_portid = portid;
	} else {
		reg_is_indoor_portid = 0;
	}

	spin_unlock(&reg_indoor_lock);

	if (!is_indoor)
		reg_check_channels();

	return 0;
}

void regulatory_netlink_notify(u32 portid)
{
	spin_lock(&reg_indoor_lock);

	if (reg_is_indoor_portid != portid) {
		spin_unlock(&reg_indoor_lock);
		return;
	}

	reg_is_indoor = false;
	reg_is_indoor_portid = 0;

	spin_unlock(&reg_indoor_lock);

	reg_check_channels();
}

/* Driver hints */
int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
{
	struct regulatory_request *request;

	if (WARN_ON(!alpha2 || !wiphy))
		return -EINVAL;

	wiphy->regulatory_flags &= ~REGULATORY_CUSTOM_REG;

	request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
	if (!request)
		return -ENOMEM;

	request->wiphy_idx = get_wiphy_idx(wiphy);

	request->alpha2[0] = alpha2[0];
	request->alpha2[1] = alpha2[1];
	request->initiator = NL80211_REGDOM_SET_BY_DRIVER;

	/* Allow calling CRDA again */
	reset_crda_timeouts();

	queue_regulatory_request(request);

	return 0;
}
EXPORT_SYMBOL(regulatory_hint);

void regulatory_hint_country_ie(struct wiphy *wiphy, enum nl80211_band band,
				const u8 *country_ie, u8 country_ie_len)
{
	char alpha2[2];
	enum environment_cap env = ENVIRON_ANY;
	struct regulatory_request *request = NULL, *lr;

	/* IE len must be evenly divisible by 2 */
	if (country_ie_len & 0x01)
		return;

	if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
		return;

	request = kzalloc(sizeof(*request), GFP_KERNEL);
	if (!request)
		return;

	alpha2[0] = country_ie[0];
	alpha2[1] = country_ie[1];

	if (country_ie[2] == 'I')
		env = ENVIRON_INDOOR;
	else if (country_ie[2] == 'O')
		env = ENVIRON_OUTDOOR;

	rcu_read_lock();
	lr = get_last_request();

	if (unlikely(!lr))
		goto out;

	/*
	 * We will run this only upon a successful connection on cfg80211.
	 * We leave conflict resolution to the workqueue, where can hold
	 * the RTNL.
	 */
	if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
	    lr->wiphy_idx != WIPHY_IDX_INVALID)
		goto out;

	request->wiphy_idx = get_wiphy_idx(wiphy);
	request->alpha2[0] = alpha2[0];
	request->alpha2[1] = alpha2[1];
	request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
	request->country_ie_env = env;

	/* Allow calling CRDA again */
	reset_crda_timeouts();

	queue_regulatory_request(request);
	request = NULL;
out:
	kfree(request);
	rcu_read_unlock();
}

static void restore_alpha2(char *alpha2, bool reset_user)
{
	/* indicates there is no alpha2 to consider for restoration */
	alpha2[0] = '9';
	alpha2[1] = '7';

	/* The user setting has precedence over the module parameter */
	if (is_user_regdom_saved()) {
		/* Unless we're asked to ignore it and reset it */
		if (reset_user) {
			pr_debug("Restoring regulatory settings including user preference\n");
			user_alpha2[0] = '9';
			user_alpha2[1] = '7';

			/*
			 * If we're ignoring user settings, we still need to
			 * check the module parameter to ensure we put things
			 * back as they were for a full restore.
			 */
			if (!is_world_regdom(ieee80211_regdom)) {
				pr_debug("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
					 ieee80211_regdom[0], ieee80211_regdom[1]);
				alpha2[0] = ieee80211_regdom[0];
				alpha2[1] = ieee80211_regdom[1];
			}
		} else {
			pr_debug("Restoring regulatory settings while preserving user preference for: %c%c\n",
				 user_alpha2[0], user_alpha2[1]);
			alpha2[0] = user_alpha2[0];
			alpha2[1] = user_alpha2[1];
		}
	} else if (!is_world_regdom(ieee80211_regdom)) {
		pr_debug("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
			 ieee80211_regdom[0], ieee80211_regdom[1]);
		alpha2[0] = ieee80211_regdom[0];
		alpha2[1] = ieee80211_regdom[1];
	} else
		pr_debug("Restoring regulatory settings\n");
}

static void restore_custom_reg_settings(struct wiphy *wiphy)
{
	struct ieee80211_supported_band *sband;
	enum nl80211_band band;
	struct ieee80211_channel *chan;
	int i;

	for (band = 0; band < NUM_NL80211_BANDS; band++) {
		sband = wiphy->bands[band];
		if (!sband)
			continue;
		for (i = 0; i < sband->n_channels; i++) {
			chan = &sband->channels[i];
			chan->flags = chan->orig_flags;
			chan->max_antenna_gain = chan->orig_mag;
			chan->max_power = chan->orig_mpwr;
			chan->beacon_found = false;
		}
	}
}

/*
 * Restoring regulatory settings involves ingoring any
 * possibly stale country IE information and user regulatory
 * settings if so desired, this includes any beacon hints
 * learned as we could have traveled outside to another country
 * after disconnection. To restore regulatory settings we do
 * exactly what we did at bootup:
 *
 *   - send a core regulatory hint
 *   - send a user regulatory hint if applicable
 *
 * Device drivers that send a regulatory hint for a specific country
 * keep their own regulatory domain on wiphy->regd so that does does
 * not need to be remembered.
 */
static void restore_regulatory_settings(bool reset_user)
{
	char alpha2[2];
	char world_alpha2[2];
	struct reg_beacon *reg_beacon, *btmp;
	LIST_HEAD(tmp_reg_req_list);
	struct cfg80211_registered_device *rdev;

	ASSERT_RTNL();

	/*
	 * Clear the indoor setting in case that it is not controlled by user
	 * space, as otherwise there is no guarantee that the device is still
	 * operating in an indoor environment.
	 */
	spin_lock(&reg_indoor_lock);
	if (reg_is_indoor && !reg_is_indoor_portid) {
		reg_is_indoor = false;
		reg_check_channels();
	}
	spin_unlock(&reg_indoor_lock);

	reset_regdomains(true, &world_regdom);
	restore_alpha2(alpha2, reset_user);

	/*
	 * If there's any pending requests we simply
	 * stash them to a temporary pending queue and
	 * add then after we've restored regulatory
	 * settings.
	 */
	spin_lock(&reg_requests_lock);
	list_splice_tail_init(&reg_requests_list, &tmp_reg_req_list);
	spin_unlock(&reg_requests_lock);

	/* Clear beacon hints */
	spin_lock_bh(&reg_pending_beacons_lock);
	list_for_each_entry_safe(reg_beacon, btmp, &reg_pending_beacons, list) {
		list_del(&reg_beacon->list);
		kfree(reg_beacon);
	}
	spin_unlock_bh(&reg_pending_beacons_lock);

	list_for_each_entry_safe(reg_beacon, btmp, &reg_beacon_list, list) {
		list_del(&reg_beacon->list);
		kfree(reg_beacon);
	}

	/* First restore to the basic regulatory settings */
	world_alpha2[0] = cfg80211_world_regdom->alpha2[0];
	world_alpha2[1] = cfg80211_world_regdom->alpha2[1];

	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
		if (rdev->wiphy.regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
			continue;
		if (rdev->wiphy.regulatory_flags & REGULATORY_CUSTOM_REG)
			restore_custom_reg_settings(&rdev->wiphy);
	}

	regulatory_hint_core(world_alpha2);

	/*
	 * This restores the ieee80211_regdom module parameter
	 * preference or the last user requested regulatory
	 * settings, user regulatory settings takes precedence.
	 */
	if (is_an_alpha2(alpha2))
		regulatory_hint_user(alpha2, NL80211_USER_REG_HINT_USER);

	spin_lock(&reg_requests_lock);
	list_splice_tail_init(&tmp_reg_req_list, &reg_requests_list);
	spin_unlock(&reg_requests_lock);

	pr_debug("Kicking the queue\n");

	schedule_work(&reg_work);
}

static bool is_wiphy_all_set_reg_flag(enum ieee80211_regulatory_flags flag)
{
	struct cfg80211_registered_device *rdev;
	struct wireless_dev *wdev;

	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
		list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
			wdev_lock(wdev);
			if (!(wdev->wiphy->regulatory_flags & flag)) {
				wdev_unlock(wdev);
				return false;
			}
			wdev_unlock(wdev);
		}
	}

	return true;
}

void regulatory_hint_disconnect(void)
{
	/* Restore of regulatory settings is not required when wiphy(s)
	 * ignore IE from connected access point but clearance of beacon hints
	 * is required when wiphy(s) supports beacon hints.
	 */
	if (is_wiphy_all_set_reg_flag(REGULATORY_COUNTRY_IE_IGNORE)) {
		struct reg_beacon *reg_beacon, *btmp;

		if (is_wiphy_all_set_reg_flag(REGULATORY_DISABLE_BEACON_HINTS))
			return;

		spin_lock_bh(&reg_pending_beacons_lock);
		list_for_each_entry_safe(reg_beacon, btmp,
					 &reg_pending_beacons, list) {
			list_del(&reg_beacon->list);
			kfree(reg_beacon);
		}
		spin_unlock_bh(&reg_pending_beacons_lock);

		list_for_each_entry_safe(reg_beacon, btmp,
					 &reg_beacon_list, list) {
			list_del(&reg_beacon->list);
			kfree(reg_beacon);
		}

		return;
	}

	pr_debug("All devices are disconnected, going to restore regulatory settings\n");
	restore_regulatory_settings(false);
}

static bool freq_is_chan_12_13_14(u32 freq)
{
	if (freq == ieee80211_channel_to_frequency(12, NL80211_BAND_2GHZ) ||
	    freq == ieee80211_channel_to_frequency(13, NL80211_BAND_2GHZ) ||
	    freq == ieee80211_channel_to_frequency(14, NL80211_BAND_2GHZ))
		return true;
	return false;
}

static bool pending_reg_beacon(struct ieee80211_channel *beacon_chan)
{
	struct reg_beacon *pending_beacon;

	list_for_each_entry(pending_beacon, &reg_pending_beacons, list)
		if (beacon_chan->center_freq ==
		    pending_beacon->chan.center_freq)
			return true;
	return false;
}

int regulatory_hint_found_beacon(struct wiphy *wiphy,
				 struct ieee80211_channel *beacon_chan,
				 gfp_t gfp)
{
	struct reg_beacon *reg_beacon;
	bool processing;

	if (beacon_chan->beacon_found ||
	    beacon_chan->flags & IEEE80211_CHAN_RADAR ||
	    (beacon_chan->band == NL80211_BAND_2GHZ &&
	     !freq_is_chan_12_13_14(beacon_chan->center_freq)))
		return 0;

	spin_lock_bh(&reg_pending_beacons_lock);
	processing = pending_reg_beacon(beacon_chan);
	spin_unlock_bh(&reg_pending_beacons_lock);

	if (processing)
		return 0;

	reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
	if (!reg_beacon)
		return -ENOMEM;

	pr_debug("Found new beacon on frequency: %d MHz (Ch %d) on %s\n",
		 beacon_chan->center_freq,
		 ieee80211_frequency_to_channel(beacon_chan->center_freq),
		 wiphy_name(wiphy));

	memcpy(&reg_beacon->chan, beacon_chan,
	       sizeof(struct ieee80211_channel));

	/*
	 * Since we can be called from BH or and non-BH context
	 * we must use spin_lock_bh()
	 */
	spin_lock_bh(&reg_pending_beacons_lock);
	list_add_tail(&reg_beacon->list, &reg_pending_beacons);
	spin_unlock_bh(&reg_pending_beacons_lock);

	schedule_work(&reg_work);

	return 0;
}

static void print_rd_rules(const struct ieee80211_regdomain *rd)
{
	unsigned int i;
	const struct ieee80211_reg_rule *reg_rule = NULL;
	const struct ieee80211_freq_range *freq_range = NULL;
	const struct ieee80211_power_rule *power_rule = NULL;
	char bw[32], cac_time[32];

	pr_debug("  (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)\n");

	for (i = 0; i < rd->n_reg_rules; i++) {
		reg_rule = &rd->reg_rules[i];
		freq_range = &reg_rule->freq_range;
		power_rule = &reg_rule->power_rule;

		if (reg_rule->flags & NL80211_RRF_AUTO_BW)
			snprintf(bw, sizeof(bw), "%d KHz, %d KHz AUTO",
				 freq_range->max_bandwidth_khz,
				 reg_get_max_bandwidth(rd, reg_rule));
		else
			snprintf(bw, sizeof(bw), "%d KHz",
				 freq_range->max_bandwidth_khz);

		if (reg_rule->flags & NL80211_RRF_DFS)
			scnprintf(cac_time, sizeof(cac_time), "%u s",
				  reg_rule->dfs_cac_ms/1000);
		else
			scnprintf(cac_time, sizeof(cac_time), "N/A");


		/*
		 * There may not be documentation for max antenna gain
		 * in certain regions
		 */
		if (power_rule->max_antenna_gain)
			pr_debug("  (%d KHz - %d KHz @ %s), (%d mBi, %d mBm), (%s)\n",
				freq_range->start_freq_khz,
				freq_range->end_freq_khz,
				bw,
				power_rule->max_antenna_gain,
				power_rule->max_eirp,
				cac_time);
		else
			pr_debug("  (%d KHz - %d KHz @ %s), (N/A, %d mBm), (%s)\n",
				freq_range->start_freq_khz,
				freq_range->end_freq_khz,
				bw,
				power_rule->max_eirp,
				cac_time);
	}
}

bool reg_supported_dfs_region(enum nl80211_dfs_regions dfs_region)
{
	switch (dfs_region) {
	case NL80211_DFS_UNSET:
	case NL80211_DFS_FCC:
	case NL80211_DFS_ETSI:
	case NL80211_DFS_JP:
		return true;
	default:
		pr_debug("Ignoring unknown DFS master region: %d\n", dfs_region);
		return false;
	}
}

static void print_regdomain(const struct ieee80211_regdomain *rd)
{
	struct regulatory_request *lr = get_last_request();

	if (is_intersected_alpha2(rd->alpha2)) {
		if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
			struct cfg80211_registered_device *rdev;
			rdev = cfg80211_rdev_by_wiphy_idx(lr->wiphy_idx);
			if (rdev) {
				pr_debug("Current regulatory domain updated by AP to: %c%c\n",
					rdev->country_ie_alpha2[0],
					rdev->country_ie_alpha2[1]);
			} else
				pr_debug("Current regulatory domain intersected:\n");
		} else
			pr_debug("Current regulatory domain intersected:\n");
	} else if (is_world_regdom(rd->alpha2)) {
		pr_debug("World regulatory domain updated:\n");
	} else {
		if (is_unknown_alpha2(rd->alpha2))
			pr_debug("Regulatory domain changed to driver built-in settings (unknown country)\n");
		else {
			if (reg_request_cell_base(lr))
				pr_debug("Regulatory domain changed to country: %c%c by Cell Station\n",
					rd->alpha2[0], rd->alpha2[1]);
			else
				pr_debug("Regulatory domain changed to country: %c%c\n",
					rd->alpha2[0], rd->alpha2[1]);
		}
	}

	pr_debug(" DFS Master region: %s", reg_dfs_region_str(rd->dfs_region));
	print_rd_rules(rd);
}

static void print_regdomain_info(const struct ieee80211_regdomain *rd)
{
	pr_debug("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
	print_rd_rules(rd);
}

static int reg_set_rd_core(const struct ieee80211_regdomain *rd)
{
	if (!is_world_regdom(rd->alpha2))
		return -EINVAL;
	update_world_regdomain(rd);
	return 0;
}

static int reg_set_rd_user(const struct ieee80211_regdomain *rd,
			   struct regulatory_request *user_request)
{
	const struct ieee80211_regdomain *intersected_rd = NULL;

	if (!regdom_changes(rd->alpha2))
		return -EALREADY;

	if (!is_valid_rd(rd)) {
		pr_err("Invalid regulatory domain detected: %c%c\n",
		       rd->alpha2[0], rd->alpha2[1]);
		print_regdomain_info(rd);
		return -EINVAL;
	}

	if (!user_request->intersect) {
		reset_regdomains(false, rd);
		return 0;
	}

	intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
	if (!intersected_rd)
		return -EINVAL;

	kfree(rd);
	rd = NULL;
	reset_regdomains(false, intersected_rd);

	return 0;
}

static int reg_set_rd_driver(const struct ieee80211_regdomain *rd,
			     struct regulatory_request *driver_request)
{
	const struct ieee80211_regdomain *regd;
	const struct ieee80211_regdomain *intersected_rd = NULL;
	const struct ieee80211_regdomain *tmp;
	struct wiphy *request_wiphy;

	if (is_world_regdom(rd->alpha2))
		return -EINVAL;

	if (!regdom_changes(rd->alpha2))
		return -EALREADY;

	if (!is_valid_rd(rd)) {
		pr_err("Invalid regulatory domain detected: %c%c\n",
		       rd->alpha2[0], rd->alpha2[1]);
		print_regdomain_info(rd);
		return -EINVAL;
	}

	request_wiphy = wiphy_idx_to_wiphy(driver_request->wiphy_idx);
	if (!request_wiphy)
		return -ENODEV;

	if (!driver_request->intersect) {
		if (request_wiphy->regd)
			return -EALREADY;

		regd = reg_copy_regd(rd);
		if (IS_ERR(regd))
			return PTR_ERR(regd);

		rcu_assign_pointer(request_wiphy->regd, regd);
		reset_regdomains(false, rd);
		return 0;
	}

	intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
	if (!intersected_rd)
		return -EINVAL;

	/*
	 * We can trash what CRDA provided now.
	 * However if a driver requested this specific regulatory
	 * domain we keep it for its private use
	 */
	tmp = get_wiphy_regdom(request_wiphy);
	rcu_assign_pointer(request_wiphy->regd, rd);
	rcu_free_regdom(tmp);

	rd = NULL;

	reset_regdomains(false, intersected_rd);

	return 0;
}

static int reg_set_rd_country_ie(const struct ieee80211_regdomain *rd,
				 struct regulatory_request *country_ie_request)
{
	struct wiphy *request_wiphy;

	if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
	    !is_unknown_alpha2(rd->alpha2))
		return -EINVAL;

	/*
	 * Lets only bother proceeding on the same alpha2 if the current
	 * rd is non static (it means CRDA was present and was used last)
	 * and the pending request came in from a country IE
	 */

	if (!is_valid_rd(rd)) {
		pr_err("Invalid regulatory domain detected: %c%c\n",
		       rd->alpha2[0], rd->alpha2[1]);
		print_regdomain_info(rd);
		return -EINVAL;
	}

	request_wiphy = wiphy_idx_to_wiphy(country_ie_request->wiphy_idx);
	if (!request_wiphy)
		return -ENODEV;

	if (country_ie_request->intersect)
		return -EINVAL;

	reset_regdomains(false, rd);
	return 0;
}

/*
 * Use this call to set the current regulatory domain. Conflicts with
 * multiple drivers can be ironed out later. Caller must've already
 * kmalloc'd the rd structure.
 */
int set_regdom(const struct ieee80211_regdomain *rd,
	       enum ieee80211_regd_source regd_src)
{
	struct regulatory_request *lr;
	bool user_reset = false;
	int r;

	if (!reg_is_valid_request(rd->alpha2)) {
		kfree(rd);
		return -EINVAL;
	}

	if (regd_src == REGD_SOURCE_CRDA)
		reset_crda_timeouts();

	lr = get_last_request();

	/* Note that this doesn't update the wiphys, this is done below */
	switch (lr->initiator) {
	case NL80211_REGDOM_SET_BY_CORE:
		r = reg_set_rd_core(rd);
		break;
	case NL80211_REGDOM_SET_BY_USER:
		r = reg_set_rd_user(rd, lr);
		user_reset = true;
		break;
	case NL80211_REGDOM_SET_BY_DRIVER:
		r = reg_set_rd_driver(rd, lr);
		break;
	case NL80211_REGDOM_SET_BY_COUNTRY_IE:
		r = reg_set_rd_country_ie(rd, lr);
		break;
	default:
		WARN(1, "invalid initiator %d\n", lr->initiator);
		kfree(rd);
		return -EINVAL;
	}

	if (r) {
		switch (r) {
		case -EALREADY:
			reg_set_request_processed();
			break;
		default:
			/* Back to world regulatory in case of errors */
			restore_regulatory_settings(user_reset);
		}

		kfree(rd);
		return r;
	}

	/* This would make this whole thing pointless */
	if (WARN_ON(!lr->intersect && rd != get_cfg80211_regdom()))
		return -EINVAL;

	/* update all wiphys now with the new established regulatory domain */
	update_all_wiphy_regulatory(lr->initiator);

	print_regdomain(get_cfg80211_regdom());

	nl80211_send_reg_change_event(lr);

	reg_set_request_processed();

	return 0;
}

static int __regulatory_set_wiphy_regd(struct wiphy *wiphy,
				       struct ieee80211_regdomain *rd)
{
	const struct ieee80211_regdomain *regd;
	const struct ieee80211_regdomain *prev_regd;
	struct cfg80211_registered_device *rdev;

	if (WARN_ON(!wiphy || !rd))
		return -EINVAL;

	if (WARN(!(wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED),
		 "wiphy should have REGULATORY_WIPHY_SELF_MANAGED\n"))
		return -EPERM;

	if (WARN(!is_valid_rd(rd), "Invalid regulatory domain detected\n")) {
		print_regdomain_info(rd);
		return -EINVAL;
	}

	regd = reg_copy_regd(rd);
	if (IS_ERR(regd))
		return PTR_ERR(regd);

	rdev = wiphy_to_rdev(wiphy);

	spin_lock(&reg_requests_lock);
	prev_regd = rdev->requested_regd;
	rdev->requested_regd = regd;
	spin_unlock(&reg_requests_lock);

	kfree(prev_regd);
	return 0;
}

int regulatory_set_wiphy_regd(struct wiphy *wiphy,
			      struct ieee80211_regdomain *rd)
{
	int ret = __regulatory_set_wiphy_regd(wiphy, rd);

	if (ret)
		return ret;

	schedule_work(&reg_work);
	return 0;
}
EXPORT_SYMBOL(regulatory_set_wiphy_regd);

int regulatory_set_wiphy_regd_sync_rtnl(struct wiphy *wiphy,
					struct ieee80211_regdomain *rd)
{
	int ret;

	ASSERT_RTNL();

	ret = __regulatory_set_wiphy_regd(wiphy, rd);
	if (ret)
		return ret;

	/* process the request immediately */
	reg_process_self_managed_hints();
	return 0;
}
EXPORT_SYMBOL(regulatory_set_wiphy_regd_sync_rtnl);

void wiphy_regulatory_register(struct wiphy *wiphy)
{
	struct regulatory_request *lr = get_last_request();

	/* self-managed devices ignore beacon hints and country IE */
	if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) {
		wiphy->regulatory_flags |= REGULATORY_DISABLE_BEACON_HINTS |
					   REGULATORY_COUNTRY_IE_IGNORE;

		/*
		 * The last request may have been received before this
		 * registration call. Call the driver notifier if
		 * initiator is USER and user type is CELL_BASE.
		 */
		if (lr->initiator == NL80211_REGDOM_SET_BY_USER &&
		    lr->user_reg_hint_type == NL80211_USER_REG_HINT_CELL_BASE)
			reg_call_notifier(wiphy, lr);
	}

	if (!reg_dev_ignore_cell_hint(wiphy))
		reg_num_devs_support_basehint++;

	wiphy_update_regulatory(wiphy, lr->initiator);
	wiphy_all_share_dfs_chan_state(wiphy);
}

void wiphy_regulatory_deregister(struct wiphy *wiphy)
{
	struct wiphy *request_wiphy = NULL;
	struct regulatory_request *lr;

	lr = get_last_request();

	if (!reg_dev_ignore_cell_hint(wiphy))
		reg_num_devs_support_basehint--;

	rcu_free_regdom(get_wiphy_regdom(wiphy));
	RCU_INIT_POINTER(wiphy->regd, NULL);

	if (lr)
		request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);

	if (!request_wiphy || request_wiphy != wiphy)
		return;

	lr->wiphy_idx = WIPHY_IDX_INVALID;
	lr->country_ie_env = ENVIRON_ANY;
}

/*
 * See http://www.fcc.gov/document/5-ghz-unlicensed-spectrum-unii, for
 * UNII band definitions
 */
int cfg80211_get_unii(int freq)
{
	/* UNII-1 */
	if (freq >= 5150 && freq <= 5250)
		return 0;

	/* UNII-2A */
	if (freq > 5250 && freq <= 5350)
		return 1;

	/* UNII-2B */
	if (freq > 5350 && freq <= 5470)
		return 2;

	/* UNII-2C */
	if (freq > 5470 && freq <= 5725)
		return 3;

	/* UNII-3 */
	if (freq > 5725 && freq <= 5825)
		return 4;

	return -EINVAL;
}

bool regulatory_indoor_allowed(void)
{
	return reg_is_indoor;
}

bool regulatory_pre_cac_allowed(struct wiphy *wiphy)
{
	const struct ieee80211_regdomain *regd = NULL;
	const struct ieee80211_regdomain *wiphy_regd = NULL;
	bool pre_cac_allowed = false;

	rcu_read_lock();

	regd = rcu_dereference(cfg80211_regdomain);
	wiphy_regd = rcu_dereference(wiphy->regd);
	if (!wiphy_regd) {
		if (regd->dfs_region == NL80211_DFS_ETSI)
			pre_cac_allowed = true;

		rcu_read_unlock();

		return pre_cac_allowed;
	}

	if (regd->dfs_region == wiphy_regd->dfs_region &&
	    wiphy_regd->dfs_region == NL80211_DFS_ETSI)
		pre_cac_allowed = true;

	rcu_read_unlock();

	return pre_cac_allowed;
}

void regulatory_propagate_dfs_state(struct wiphy *wiphy,
				    struct cfg80211_chan_def *chandef,
				    enum nl80211_dfs_state dfs_state,
				    enum nl80211_radar_event event)
{
	struct cfg80211_registered_device *rdev;

	ASSERT_RTNL();

	if (WARN_ON(!cfg80211_chandef_valid(chandef)))
		return;

	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
		if (wiphy == &rdev->wiphy)
			continue;

		if (!reg_dfs_domain_same(wiphy, &rdev->wiphy))
			continue;

		if (!ieee80211_get_channel(&rdev->wiphy,
					   chandef->chan->center_freq))
			continue;

		cfg80211_set_dfs_state(&rdev->wiphy, chandef, dfs_state);

		if (event == NL80211_RADAR_DETECTED ||
		    event == NL80211_RADAR_CAC_FINISHED)
			cfg80211_sched_dfs_chan_update(rdev);

		nl80211_radar_notify(rdev, chandef, event, NULL, GFP_KERNEL);
	}
}

static int __init regulatory_init_db(void)
{
	int err;

	err = load_builtin_regdb_keys();
	if (err)
		return err;

	/* We always try to get an update for the static regdomain */
	err = regulatory_hint_core(cfg80211_world_regdom->alpha2);
	if (err) {
		if (err == -ENOMEM) {
			platform_device_unregister(reg_pdev);
			return err;
		}
		/*
		 * N.B. kobject_uevent_env() can fail mainly for when we're out
		 * memory which is handled and propagated appropriately above
		 * but it can also fail during a netlink_broadcast() or during
		 * early boot for call_usermodehelper(). For now treat these
		 * errors as non-fatal.
		 */
		pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
	}

	/*
	 * Finally, if the user set the module parameter treat it
	 * as a user hint.
	 */
	if (!is_world_regdom(ieee80211_regdom))
		regulatory_hint_user(ieee80211_regdom,
				     NL80211_USER_REG_HINT_USER);

	return 0;
}
#ifndef MODULE
late_initcall(regulatory_init_db);
#endif

int __init regulatory_init(void)
{
	reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
	if (IS_ERR(reg_pdev))
		return PTR_ERR(reg_pdev);

	spin_lock_init(&reg_requests_lock);
	spin_lock_init(&reg_pending_beacons_lock);
	spin_lock_init(&reg_indoor_lock);

	rcu_assign_pointer(cfg80211_regdomain, cfg80211_world_regdom);

	user_alpha2[0] = '9';
	user_alpha2[1] = '7';

#ifdef MODULE
	return regulatory_init_db();
#else
	return 0;
#endif
}

void regulatory_exit(void)
{
	struct regulatory_request *reg_request, *tmp;
	struct reg_beacon *reg_beacon, *btmp;

	cancel_work_sync(&reg_work);
	cancel_crda_timeout_sync();
	cancel_delayed_work_sync(&reg_check_chans);

	/* Lock to suppress warnings */
	rtnl_lock();
	reset_regdomains(true, NULL);
	rtnl_unlock();

	dev_set_uevent_suppress(&reg_pdev->dev, true);

	platform_device_unregister(reg_pdev);

	list_for_each_entry_safe(reg_beacon, btmp, &reg_pending_beacons, list) {
		list_del(&reg_beacon->list);
		kfree(reg_beacon);
	}

	list_for_each_entry_safe(reg_beacon, btmp, &reg_beacon_list, list) {
		list_del(&reg_beacon->list);
		kfree(reg_beacon);
	}

	list_for_each_entry_safe(reg_request, tmp, &reg_requests_list, list) {
		list_del(&reg_request->list);
		kfree(reg_request);
	}

	if (!IS_ERR_OR_NULL(regdb))
		kfree(regdb);

	free_regdb_keyring();
}