summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/mwifiex/scan.c
blob: 9189a32b7844b713815636d03517e7532da31f94 (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
/*
 * Marvell Wireless LAN device driver: scan ioctl and command handling
 *
 * Copyright (C) 2011, Marvell International Ltd.
 *
 * This software file (the "File") is distributed by Marvell International
 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
 * (the "License").  You may use, redistribute and/or modify this File in
 * accordance with the terms and conditions of the License, a copy of which
 * is available by writing to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 *
 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
 * this warranty disclaimer.
 */

#include "decl.h"
#include "ioctl.h"
#include "util.h"
#include "fw.h"
#include "main.h"
#include "11n.h"
#include "cfg80211.h"

/* The maximum number of channels the firmware can scan per command */
#define MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN   14

#define MWIFIEX_DEF_CHANNELS_PER_SCAN_CMD	4
#define MWIFIEX_LIMIT_1_CHANNEL_PER_SCAN_CMD	15
#define MWIFIEX_LIMIT_2_CHANNELS_PER_SCAN_CMD	27
#define MWIFIEX_LIMIT_3_CHANNELS_PER_SCAN_CMD	35

/* Memory needed to store a max sized Channel List TLV for a firmware scan */
#define CHAN_TLV_MAX_SIZE  (sizeof(struct mwifiex_ie_types_header)         \
				+ (MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN     \
				*sizeof(struct mwifiex_chan_scan_param_set)))

/* Memory needed to store supported rate */
#define RATE_TLV_MAX_SIZE   (sizeof(struct mwifiex_ie_types_rates_param_set) \
				+ HOSTCMD_SUPPORTED_RATES)

/* Memory needed to store a max number/size WildCard SSID TLV for a firmware
	scan */
#define WILDCARD_SSID_TLV_MAX_SIZE  \
	(MWIFIEX_MAX_SSID_LIST_LENGTH *					\
		(sizeof(struct mwifiex_ie_types_wildcard_ssid_params)	\
			+ IEEE80211_MAX_SSID_LEN))

/* Maximum memory needed for a mwifiex_scan_cmd_config with all TLVs at max */
#define MAX_SCAN_CFG_ALLOC (sizeof(struct mwifiex_scan_cmd_config)        \
				+ sizeof(struct mwifiex_ie_types_num_probes)   \
				+ sizeof(struct mwifiex_ie_types_htcap)       \
				+ CHAN_TLV_MAX_SIZE                 \
				+ RATE_TLV_MAX_SIZE                 \
				+ WILDCARD_SSID_TLV_MAX_SIZE)


union mwifiex_scan_cmd_config_tlv {
	/* Scan configuration (variable length) */
	struct mwifiex_scan_cmd_config config;
	/* Max allocated block */
	u8 config_alloc_buf[MAX_SCAN_CFG_ALLOC];
};

enum cipher_suite {
	CIPHER_SUITE_TKIP,
	CIPHER_SUITE_CCMP,
	CIPHER_SUITE_MAX
};
static u8 mwifiex_wpa_oui[CIPHER_SUITE_MAX][4] = {
	{ 0x00, 0x50, 0xf2, 0x02 },	/* TKIP */
	{ 0x00, 0x50, 0xf2, 0x04 },	/* AES  */
};
static u8 mwifiex_rsn_oui[CIPHER_SUITE_MAX][4] = {
	{ 0x00, 0x0f, 0xac, 0x02 },	/* TKIP */
	{ 0x00, 0x0f, 0xac, 0x04 },	/* AES  */
};

/*
 * This function parses a given IE for a given OUI.
 *
 * This is used to parse a WPA/RSN IE to find if it has
 * a given oui in PTK.
 */
static u8
mwifiex_search_oui_in_ie(struct ie_body *iebody, u8 *oui)
{
	u8 count;

	count = iebody->ptk_cnt[0];

	/* There could be multiple OUIs for PTK hence
	   1) Take the length.
	   2) Check all the OUIs for AES.
	   3) If one of them is AES then pass success. */
	while (count) {
		if (!memcmp(iebody->ptk_body, oui, sizeof(iebody->ptk_body)))
			return MWIFIEX_OUI_PRESENT;

		--count;
		if (count)
			iebody = (struct ie_body *) ((u8 *) iebody +
						sizeof(iebody->ptk_body));
	}

	pr_debug("info: %s: OUI is not found in PTK\n", __func__);
	return MWIFIEX_OUI_NOT_PRESENT;
}

/*
 * This function checks if a given OUI is present in a RSN IE.
 *
 * The function first checks if a RSN IE is present or not in the
 * BSS descriptor. It tries to locate the OUI only if such an IE is
 * present.
 */
static u8
mwifiex_is_rsn_oui_present(struct mwifiex_bssdescriptor *bss_desc, u32 cipher)
{
	u8 *oui;
	struct ie_body *iebody;
	u8 ret = MWIFIEX_OUI_NOT_PRESENT;

	if (((bss_desc->bcn_rsn_ie) && ((*(bss_desc->bcn_rsn_ie)).
					ieee_hdr.element_id == WLAN_EID_RSN))) {
		iebody = (struct ie_body *)
			 (((u8 *) bss_desc->bcn_rsn_ie->data) +
			  RSN_GTK_OUI_OFFSET);
		oui = &mwifiex_rsn_oui[cipher][0];
		ret = mwifiex_search_oui_in_ie(iebody, oui);
		if (ret)
			return ret;
	}
	return ret;
}

/*
 * This function checks if a given OUI is present in a WPA IE.
 *
 * The function first checks if a WPA IE is present or not in the
 * BSS descriptor. It tries to locate the OUI only if such an IE is
 * present.
 */
static u8
mwifiex_is_wpa_oui_present(struct mwifiex_bssdescriptor *bss_desc, u32 cipher)
{
	u8 *oui;
	struct ie_body *iebody;
	u8 ret = MWIFIEX_OUI_NOT_PRESENT;

	if (((bss_desc->bcn_wpa_ie) &&
	     ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id ==
	      WLAN_EID_VENDOR_SPECIFIC))) {
		iebody = (struct ie_body *) bss_desc->bcn_wpa_ie->data;
		oui = &mwifiex_wpa_oui[cipher][0];
		ret = mwifiex_search_oui_in_ie(iebody, oui);
		if (ret)
			return ret;
	}
	return ret;
}

/*
 * This function compares two SSIDs and checks if they match.
 */
s32
mwifiex_ssid_cmp(struct cfg80211_ssid *ssid1, struct cfg80211_ssid *ssid2)
{
	if (!ssid1 || !ssid2 || (ssid1->ssid_len != ssid2->ssid_len))
		return -1;
	return memcmp(ssid1->ssid, ssid2->ssid, ssid1->ssid_len);
}

/*
 * This function checks if wapi is enabled in driver and scanned network is
 * compatible with it.
 */
static bool
mwifiex_is_bss_wapi(struct mwifiex_private *priv,
		    struct mwifiex_bssdescriptor *bss_desc)
{
	if (priv->sec_info.wapi_enabled &&
	    (bss_desc->bcn_wapi_ie &&
	     ((*(bss_desc->bcn_wapi_ie)).ieee_hdr.element_id ==
			WLAN_EID_BSS_AC_ACCESS_DELAY))) {
		return true;
	}
	return false;
}

/*
 * This function checks if driver is configured with no security mode and
 * scanned network is compatible with it.
 */
static bool
mwifiex_is_bss_no_sec(struct mwifiex_private *priv,
		      struct mwifiex_bssdescriptor *bss_desc)
{
	if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
	    !priv->sec_info.wpa2_enabled && ((!bss_desc->bcn_wpa_ie) ||
		((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id !=
		 WLAN_EID_VENDOR_SPECIFIC)) &&
	    ((!bss_desc->bcn_rsn_ie) ||
		((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id !=
		 WLAN_EID_RSN)) &&
	    !priv->sec_info.encryption_mode && !bss_desc->privacy) {
		return true;
	}
	return false;
}

/*
 * This function checks if static WEP is enabled in driver and scanned network
 * is compatible with it.
 */
static bool
mwifiex_is_bss_static_wep(struct mwifiex_private *priv,
			  struct mwifiex_bssdescriptor *bss_desc)
{
	if (priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
	    !priv->sec_info.wpa2_enabled && bss_desc->privacy) {
		return true;
	}
	return false;
}

/*
 * This function checks if wpa is enabled in driver and scanned network is
 * compatible with it.
 */
static bool
mwifiex_is_bss_wpa(struct mwifiex_private *priv,
		   struct mwifiex_bssdescriptor *bss_desc)
{
	if (!priv->sec_info.wep_enabled && priv->sec_info.wpa_enabled &&
	    !priv->sec_info.wpa2_enabled && ((bss_desc->bcn_wpa_ie) &&
	    ((*(bss_desc->bcn_wpa_ie)).
	     vend_hdr.element_id == WLAN_EID_VENDOR_SPECIFIC))
	   /*
	    * Privacy bit may NOT be set in some APs like
	    * LinkSys WRT54G && bss_desc->privacy
	    */
	 ) {
		dev_dbg(priv->adapter->dev, "info: %s: WPA:"
			" wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
			"EncMode=%#x privacy=%#x\n", __func__,
			(bss_desc->bcn_wpa_ie) ?
			(*(bss_desc->bcn_wpa_ie)).
			vend_hdr.element_id : 0,
			(bss_desc->bcn_rsn_ie) ?
			(*(bss_desc->bcn_rsn_ie)).
			ieee_hdr.element_id : 0,
			(priv->sec_info.wep_enabled) ? "e" : "d",
			(priv->sec_info.wpa_enabled) ? "e" : "d",
			(priv->sec_info.wpa2_enabled) ? "e" : "d",
			priv->sec_info.encryption_mode,
			bss_desc->privacy);
		return true;
	}
	return false;
}

/*
 * This function checks if wpa2 is enabled in driver and scanned network is
 * compatible with it.
 */
static bool
mwifiex_is_bss_wpa2(struct mwifiex_private *priv,
		    struct mwifiex_bssdescriptor *bss_desc)
{
	if (!priv->sec_info.wep_enabled &&
	    !priv->sec_info.wpa_enabled &&
	    priv->sec_info.wpa2_enabled &&
	    ((bss_desc->bcn_rsn_ie) &&
	     ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id == WLAN_EID_RSN))) {
		/*
		 * Privacy bit may NOT be set in some APs like
		 * LinkSys WRT54G && bss_desc->privacy
		 */
		dev_dbg(priv->adapter->dev, "info: %s: WPA2: "
			" wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
			"EncMode=%#x privacy=%#x\n", __func__,
			(bss_desc->bcn_wpa_ie) ?
			(*(bss_desc->bcn_wpa_ie)).
			vend_hdr.element_id : 0,
			(bss_desc->bcn_rsn_ie) ?
			(*(bss_desc->bcn_rsn_ie)).
			ieee_hdr.element_id : 0,
			(priv->sec_info.wep_enabled) ? "e" : "d",
			(priv->sec_info.wpa_enabled) ? "e" : "d",
			(priv->sec_info.wpa2_enabled) ? "e" : "d",
			priv->sec_info.encryption_mode,
			bss_desc->privacy);
		return true;
	}
	return false;
}

/*
 * This function checks if adhoc AES is enabled in driver and scanned network is
 * compatible with it.
 */
static bool
mwifiex_is_bss_adhoc_aes(struct mwifiex_private *priv,
			 struct mwifiex_bssdescriptor *bss_desc)
{
	if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
	    !priv->sec_info.wpa2_enabled &&
	    ((!bss_desc->bcn_wpa_ie) ||
	     ((*(bss_desc->bcn_wpa_ie)).
	      vend_hdr.element_id != WLAN_EID_VENDOR_SPECIFIC)) &&
	    ((!bss_desc->bcn_rsn_ie) ||
	     ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id != WLAN_EID_RSN)) &&
	    !priv->sec_info.encryption_mode && bss_desc->privacy) {
		return true;
	}
	return false;
}

/*
 * This function checks if dynamic WEP is enabled in driver and scanned network
 * is compatible with it.
 */
static bool
mwifiex_is_bss_dynamic_wep(struct mwifiex_private *priv,
			   struct mwifiex_bssdescriptor *bss_desc)
{
	if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
	    !priv->sec_info.wpa2_enabled &&
	    ((!bss_desc->bcn_wpa_ie) ||
	     ((*(bss_desc->bcn_wpa_ie)).
	      vend_hdr.element_id != WLAN_EID_VENDOR_SPECIFIC)) &&
	    ((!bss_desc->bcn_rsn_ie) ||
	     ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id != WLAN_EID_RSN)) &&
	    priv->sec_info.encryption_mode && bss_desc->privacy) {
		dev_dbg(priv->adapter->dev, "info: %s: dynamic "
			"WEP: wpa_ie=%#x wpa2_ie=%#x "
			"EncMode=%#x privacy=%#x\n",
			__func__,
			(bss_desc->bcn_wpa_ie) ?
			(*(bss_desc->bcn_wpa_ie)).
			vend_hdr.element_id : 0,
			(bss_desc->bcn_rsn_ie) ?
			(*(bss_desc->bcn_rsn_ie)).
			ieee_hdr.element_id : 0,
			priv->sec_info.encryption_mode,
			bss_desc->privacy);
		return true;
	}
	return false;
}

/*
 * This function checks if a scanned network is compatible with the driver
 * settings.
 *
 *   WEP     WPA    WPA2   ad-hoc encrypt                  Network
 * enabled enabled enabled  AES    mode   Privacy WPA WPA2 Compatible
 *    0       0       0      0     NONE      0     0   0   yes No security
 *    0       1       0      0      x        1x    1   x   yes WPA (disable
 *                                                         HT if no AES)
 *    0       0       1      0      x        1x    x   1   yes WPA2 (disable
 *                                                         HT if no AES)
 *    0       0       0      1     NONE      1     0   0   yes Ad-hoc AES
 *    1       0       0      0     NONE      1     0   0   yes Static WEP
 *                                                         (disable HT)
 *    0       0       0      0    !=NONE     1     0   0   yes Dynamic WEP
 *
 * Compatibility is not matched while roaming, except for mode.
 */
static s32
mwifiex_is_network_compatible(struct mwifiex_private *priv,
			      struct mwifiex_bssdescriptor *bss_desc, u32 mode)
{
	struct mwifiex_adapter *adapter = priv->adapter;

	bss_desc->disable_11n = false;

	/* Don't check for compatibility if roaming */
	if (priv->media_connected &&
	    (priv->bss_mode == NL80211_IFTYPE_STATION) &&
	    (bss_desc->bss_mode == NL80211_IFTYPE_STATION))
		return 0;

	if (priv->wps.session_enable) {
		dev_dbg(adapter->dev,
			"info: return success directly in WPS period\n");
		return 0;
	}

	if (mwifiex_is_bss_wapi(priv, bss_desc)) {
		dev_dbg(adapter->dev, "info: return success for WAPI AP\n");
		return 0;
	}

	if (bss_desc->bss_mode == mode) {
		if (mwifiex_is_bss_no_sec(priv, bss_desc)) {
			/* No security */
			return 0;
		} else if (mwifiex_is_bss_static_wep(priv, bss_desc)) {
			/* Static WEP enabled */
			dev_dbg(adapter->dev, "info: Disable 11n in WEP mode.\n");
			bss_desc->disable_11n = true;
			return 0;
		} else if (mwifiex_is_bss_wpa(priv, bss_desc)) {
			/* WPA enabled */
			if (((priv->adapter->config_bands & BAND_GN ||
			      priv->adapter->config_bands & BAND_AN) &&
			     bss_desc->bcn_ht_cap) &&
			    !mwifiex_is_wpa_oui_present(bss_desc,
							 CIPHER_SUITE_CCMP)) {

				if (mwifiex_is_wpa_oui_present
						(bss_desc, CIPHER_SUITE_TKIP)) {
					dev_dbg(adapter->dev,
						"info: Disable 11n if AES "
						"is not supported by AP\n");
					bss_desc->disable_11n = true;
				} else {
					return -1;
				}
			}
			return 0;
		} else if (mwifiex_is_bss_wpa2(priv, bss_desc)) {
			/* WPA2 enabled */
			if (((priv->adapter->config_bands & BAND_GN ||
			      priv->adapter->config_bands & BAND_AN) &&
			     bss_desc->bcn_ht_cap) &&
			    !mwifiex_is_rsn_oui_present(bss_desc,
							CIPHER_SUITE_CCMP)) {

				if (mwifiex_is_rsn_oui_present
						(bss_desc, CIPHER_SUITE_TKIP)) {
					dev_dbg(adapter->dev,
						"info: Disable 11n if AES "
						"is not supported by AP\n");
					bss_desc->disable_11n = true;
				} else {
					return -1;
				}
			}
			return 0;
		} else if (mwifiex_is_bss_adhoc_aes(priv, bss_desc)) {
			/* Ad-hoc AES enabled */
			return 0;
		} else if (mwifiex_is_bss_dynamic_wep(priv, bss_desc)) {
			/* Dynamic WEP enabled */
			return 0;
		}

		/* Security doesn't match */
		dev_dbg(adapter->dev,
			"info: %s: failed: wpa_ie=%#x wpa2_ie=%#x WEP=%s "
			"WPA=%s WPA2=%s EncMode=%#x privacy=%#x\n", __func__,
			(bss_desc->bcn_wpa_ie) ?
			(*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id : 0,
			(bss_desc->bcn_rsn_ie) ?
			(*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id : 0,
			(priv->sec_info.wep_enabled) ? "e" : "d",
			(priv->sec_info.wpa_enabled) ? "e" : "d",
			(priv->sec_info.wpa2_enabled) ? "e" : "d",
			priv->sec_info.encryption_mode, bss_desc->privacy);
		return -1;
	}

	/* Mode doesn't match */
	return -1;
}

/*
 * This function creates a channel list for the driver to scan, based
 * on region/band information.
 *
 * This routine is used for any scan that is not provided with a
 * specific channel list to scan.
 */
static int
mwifiex_scan_create_channel_list(struct mwifiex_private *priv,
				 const struct mwifiex_user_scan_cfg
							*user_scan_in,
				 struct mwifiex_chan_scan_param_set
							*scan_chan_list,
				 u8 filtered_scan)
{
	enum ieee80211_band band;
	struct ieee80211_supported_band *sband;
	struct ieee80211_channel *ch;
	struct mwifiex_adapter *adapter = priv->adapter;
	int chan_idx = 0, i;

	for (band = 0; (band < IEEE80211_NUM_BANDS) ; band++) {

		if (!priv->wdev->wiphy->bands[band])
			continue;

		sband = priv->wdev->wiphy->bands[band];

		for (i = 0; (i < sband->n_channels) ; i++) {
			ch = &sband->channels[i];
			if (ch->flags & IEEE80211_CHAN_DISABLED)
				continue;
			scan_chan_list[chan_idx].radio_type = band;

			if (user_scan_in &&
			    user_scan_in->chan_list[0].scan_time)
				scan_chan_list[chan_idx].max_scan_time =
					cpu_to_le16((u16) user_scan_in->
					chan_list[0].scan_time);
			else if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
				scan_chan_list[chan_idx].max_scan_time =
					cpu_to_le16(adapter->passive_scan_time);
			else
				scan_chan_list[chan_idx].max_scan_time =
					cpu_to_le16(adapter->active_scan_time);

			if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
				scan_chan_list[chan_idx].chan_scan_mode_bitmap
					|= MWIFIEX_PASSIVE_SCAN;
			else
				scan_chan_list[chan_idx].chan_scan_mode_bitmap
					&= ~MWIFIEX_PASSIVE_SCAN;
			scan_chan_list[chan_idx].chan_number =
							(u32) ch->hw_value;
			if (filtered_scan) {
				scan_chan_list[chan_idx].max_scan_time =
				cpu_to_le16(adapter->specific_scan_time);
				scan_chan_list[chan_idx].chan_scan_mode_bitmap
					|= MWIFIEX_DISABLE_CHAN_FILT;
			}
			chan_idx++;
		}

	}
	return chan_idx;
}

/*
 * This function constructs and sends multiple scan config commands to
 * the firmware.
 *
 * Previous routines in the code flow have created a scan command configuration
 * with any requested TLVs.  This function splits the channel TLV into maximum
 * channels supported per scan lists and sends the portion of the channel TLV,
 * along with the other TLVs, to the firmware.
 */
static int
mwifiex_scan_channel_list(struct mwifiex_private *priv,
			  u32 max_chan_per_scan, u8 filtered_scan,
			  struct mwifiex_scan_cmd_config *scan_cfg_out,
			  struct mwifiex_ie_types_chan_list_param_set
			  *chan_tlv_out,
			  struct mwifiex_chan_scan_param_set *scan_chan_list)
{
	int ret = 0;
	struct mwifiex_chan_scan_param_set *tmp_chan_list;
	struct mwifiex_chan_scan_param_set *start_chan;

	u32 tlv_idx;
	u32 total_scan_time;
	u32 done_early;

	if (!scan_cfg_out || !chan_tlv_out || !scan_chan_list) {
		dev_dbg(priv->adapter->dev,
			"info: Scan: Null detect: %p, %p, %p\n",
		       scan_cfg_out, chan_tlv_out, scan_chan_list);
		return -1;
	}

	chan_tlv_out->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);

	/* Set the temp channel struct pointer to the start of the desired
	   list */
	tmp_chan_list = scan_chan_list;

	/* Loop through the desired channel list, sending a new firmware scan
	   commands for each max_chan_per_scan channels (or for 1,6,11
	   individually if configured accordingly) */
	while (tmp_chan_list->chan_number) {

		tlv_idx = 0;
		total_scan_time = 0;
		chan_tlv_out->header.len = 0;
		start_chan = tmp_chan_list;
		done_early = false;

		/*
		 * Construct the Channel TLV for the scan command.  Continue to
		 * insert channel TLVs until:
		 *   - the tlv_idx hits the maximum configured per scan command
		 *   - the next channel to insert is 0 (end of desired channel
		 *     list)
		 *   - done_early is set (controlling individual scanning of
		 *     1,6,11)
		 */
		while (tlv_idx < max_chan_per_scan &&
		       tmp_chan_list->chan_number && !done_early) {

			dev_dbg(priv->adapter->dev,
				"info: Scan: Chan(%3d), Radio(%d),"
				" Mode(%d, %d), Dur(%d)\n",
				tmp_chan_list->chan_number,
				tmp_chan_list->radio_type,
				tmp_chan_list->chan_scan_mode_bitmap
				& MWIFIEX_PASSIVE_SCAN,
				(tmp_chan_list->chan_scan_mode_bitmap
				 & MWIFIEX_DISABLE_CHAN_FILT) >> 1,
				le16_to_cpu(tmp_chan_list->max_scan_time));

			/* Copy the current channel TLV to the command being
			   prepared */
			memcpy(chan_tlv_out->chan_scan_param + tlv_idx,
			       tmp_chan_list,
			       sizeof(chan_tlv_out->chan_scan_param));

			/* Increment the TLV header length by the size
			   appended */
			le16_add_cpu(&chan_tlv_out->header.len,
				     sizeof(chan_tlv_out->chan_scan_param));

			/*
			 * The tlv buffer length is set to the number of bytes
			 * of the between the channel tlv pointer and the start
			 * of the tlv buffer.  This compensates for any TLVs
			 * that were appended before the channel list.
			 */
			scan_cfg_out->tlv_buf_len = (u32) ((u8 *) chan_tlv_out -
							scan_cfg_out->tlv_buf);

			/* Add the size of the channel tlv header and the data
			   length */
			scan_cfg_out->tlv_buf_len +=
				(sizeof(chan_tlv_out->header)
				 + le16_to_cpu(chan_tlv_out->header.len));

			/* Increment the index to the channel tlv we are
			   constructing */
			tlv_idx++;

			/* Count the total scan time per command */
			total_scan_time +=
				le16_to_cpu(tmp_chan_list->max_scan_time);

			done_early = false;

			/* Stop the loop if the *current* channel is in the
			   1,6,11 set and we are not filtering on a BSSID
			   or SSID. */
			if (!filtered_scan &&
			    (tmp_chan_list->chan_number == 1 ||
			     tmp_chan_list->chan_number == 6 ||
			     tmp_chan_list->chan_number == 11))
				done_early = true;

			/* Increment the tmp pointer to the next channel to
			   be scanned */
			tmp_chan_list++;

			/* Stop the loop if the *next* channel is in the 1,6,11
			   set.  This will cause it to be the only channel
			   scanned on the next interation */
			if (!filtered_scan &&
			    (tmp_chan_list->chan_number == 1 ||
			     tmp_chan_list->chan_number == 6 ||
			     tmp_chan_list->chan_number == 11))
				done_early = true;
		}

		/* The total scan time should be less than scan command timeout
		   value */
		if (total_scan_time > MWIFIEX_MAX_TOTAL_SCAN_TIME) {
			dev_err(priv->adapter->dev, "total scan time %dms"
				" is over limit (%dms), scan skipped\n",
				total_scan_time, MWIFIEX_MAX_TOTAL_SCAN_TIME);
			ret = -1;
			break;
		}

		priv->adapter->scan_channels = start_chan;

		/* Send the scan command to the firmware with the specified
		   cfg */
		ret = mwifiex_send_cmd_async(priv, HostCmd_CMD_802_11_SCAN,
					     HostCmd_ACT_GEN_SET, 0,
					     scan_cfg_out);
		if (ret)
			break;
	}

	if (ret)
		return -1;

	return 0;
}

/*
 * This function constructs a scan command configuration structure to use
 * in scan commands.
 *
 * Application layer or other functions can invoke network scanning
 * with a scan configuration supplied in a user scan configuration structure.
 * This structure is used as the basis of one or many scan command configuration
 * commands that are sent to the command processing module and eventually to the
 * firmware.
 *
 * This function creates a scan command configuration structure  based on the
 * following user supplied parameters (if present):
 *      - SSID filter
 *      - BSSID filter
 *      - Number of Probes to be sent
 *      - Channel list
 *
 * If the SSID or BSSID filter is not present, the filter is disabled/cleared.
 * If the number of probes is not set, adapter default setting is used.
 */
static void
mwifiex_config_scan(struct mwifiex_private *priv,
		    const struct mwifiex_user_scan_cfg *user_scan_in,
		    struct mwifiex_scan_cmd_config *scan_cfg_out,
		    struct mwifiex_ie_types_chan_list_param_set **chan_list_out,
		    struct mwifiex_chan_scan_param_set *scan_chan_list,
		    u8 *max_chan_per_scan, u8 *filtered_scan,
		    u8 *scan_current_only)
{
	struct mwifiex_adapter *adapter = priv->adapter;
	struct mwifiex_ie_types_num_probes *num_probes_tlv;
	struct mwifiex_ie_types_wildcard_ssid_params *wildcard_ssid_tlv;
	struct mwifiex_ie_types_rates_param_set *rates_tlv;
	u8 *tlv_pos;
	u32 num_probes;
	u32 ssid_len;
	u32 chan_idx;
	u32 chan_num;
	u32 scan_type;
	u16 scan_dur;
	u8 channel;
	u8 radio_type;
	int i;
	u8 ssid_filter;
	u8 rates[MWIFIEX_SUPPORTED_RATES];
	u32 rates_size;
	struct mwifiex_ie_types_htcap *ht_cap;

	/* The tlv_buf_len is calculated for each scan command.  The TLVs added
	   in this routine will be preserved since the routine that sends the
	   command will append channelTLVs at *chan_list_out.  The difference
	   between the *chan_list_out and the tlv_buf start will be used to
	   calculate the size of anything we add in this routine. */
	scan_cfg_out->tlv_buf_len = 0;

	/* Running tlv pointer.  Assigned to chan_list_out at end of function
	   so later routines know where channels can be added to the command
	   buf */
	tlv_pos = scan_cfg_out->tlv_buf;

	/* Initialize the scan as un-filtered; the flag is later set to TRUE
	   below if a SSID or BSSID filter is sent in the command */
	*filtered_scan = false;

	/* Initialize the scan as not being only on the current channel.  If
	   the channel list is customized, only contains one channel, and is
	   the active channel, this is set true and data flow is not halted. */
	*scan_current_only = false;

	if (user_scan_in) {

		/* Default the ssid_filter flag to TRUE, set false under
		   certain wildcard conditions and qualified by the existence
		   of an SSID list before marking the scan as filtered */
		ssid_filter = true;

		/* Set the BSS type scan filter, use Adapter setting if
		   unset */
		scan_cfg_out->bss_mode =
			(user_scan_in->bss_mode ? (u8) user_scan_in->
			 bss_mode : (u8) adapter->scan_mode);

		/* Set the number of probes to send, use Adapter setting
		   if unset */
		num_probes =
			(user_scan_in->num_probes ? user_scan_in->
			 num_probes : adapter->scan_probes);

		/*
		 * Set the BSSID filter to the incoming configuration,
		 * if non-zero.  If not set, it will remain disabled
		 * (all zeros).
		 */
		memcpy(scan_cfg_out->specific_bssid,
		       user_scan_in->specific_bssid,
		       sizeof(scan_cfg_out->specific_bssid));

		for (i = 0; i < user_scan_in->num_ssids; i++) {
			ssid_len = user_scan_in->ssid_list[i].ssid_len;

			wildcard_ssid_tlv =
				(struct mwifiex_ie_types_wildcard_ssid_params *)
				tlv_pos;
			wildcard_ssid_tlv->header.type =
				cpu_to_le16(TLV_TYPE_WILDCARDSSID);
			wildcard_ssid_tlv->header.len = cpu_to_le16(
				(u16) (ssid_len + sizeof(wildcard_ssid_tlv->
							 max_ssid_length)));

			/*
			 * max_ssid_length = 0 tells firmware to perform
			 * specific scan for the SSID filled, whereas
			 * max_ssid_length = IEEE80211_MAX_SSID_LEN is for
			 * wildcard scan.
			 */
			if (ssid_len)
				wildcard_ssid_tlv->max_ssid_length = 0;
			else
				wildcard_ssid_tlv->max_ssid_length =
							IEEE80211_MAX_SSID_LEN;

			memcpy(wildcard_ssid_tlv->ssid,
			       user_scan_in->ssid_list[i].ssid, ssid_len);

			tlv_pos += (sizeof(wildcard_ssid_tlv->header)
				+ le16_to_cpu(wildcard_ssid_tlv->header.len));

			dev_dbg(adapter->dev, "info: scan: ssid[%d]: %s, %d\n",
				i, wildcard_ssid_tlv->ssid,
				wildcard_ssid_tlv->max_ssid_length);

			/* Empty wildcard ssid with a maxlen will match many or
			   potentially all SSIDs (maxlen == 32), therefore do
			   not treat the scan as
			   filtered. */
			if (!ssid_len && wildcard_ssid_tlv->max_ssid_length)
				ssid_filter = false;
		}

		/*
		 *  The default number of channels sent in the command is low to
		 *  ensure the response buffer from the firmware does not
		 *  truncate scan results.  That is not an issue with an SSID
		 *  or BSSID filter applied to the scan results in the firmware.
		 */
		if ((i && ssid_filter) ||
		    !is_zero_ether_addr(scan_cfg_out->specific_bssid))
			*filtered_scan = true;
	} else {
		scan_cfg_out->bss_mode = (u8) adapter->scan_mode;
		num_probes = adapter->scan_probes;
	}

	/*
	 *  If a specific BSSID or SSID is used, the number of channels in the
	 *  scan command will be increased to the absolute maximum.
	 */
	if (*filtered_scan)
		*max_chan_per_scan = MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN;
	else
		*max_chan_per_scan = MWIFIEX_DEF_CHANNELS_PER_SCAN_CMD;

	/* If the input config or adapter has the number of Probes set,
	   add tlv */
	if (num_probes) {

		dev_dbg(adapter->dev, "info: scan: num_probes = %d\n",
			num_probes);

		num_probes_tlv = (struct mwifiex_ie_types_num_probes *) tlv_pos;
		num_probes_tlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES);
		num_probes_tlv->header.len =
			cpu_to_le16(sizeof(num_probes_tlv->num_probes));
		num_probes_tlv->num_probes = cpu_to_le16((u16) num_probes);

		tlv_pos += sizeof(num_probes_tlv->header) +
			le16_to_cpu(num_probes_tlv->header.len);

	}

	/* Append rates tlv */
	memset(rates, 0, sizeof(rates));

	rates_size = mwifiex_get_supported_rates(priv, rates);

	rates_tlv = (struct mwifiex_ie_types_rates_param_set *) tlv_pos;
	rates_tlv->header.type = cpu_to_le16(WLAN_EID_SUPP_RATES);
	rates_tlv->header.len = cpu_to_le16((u16) rates_size);
	memcpy(rates_tlv->rates, rates, rates_size);
	tlv_pos += sizeof(rates_tlv->header) + rates_size;

	dev_dbg(adapter->dev, "info: SCAN_CMD: Rates size = %d\n", rates_size);

	if (ISSUPP_11NENABLED(priv->adapter->fw_cap_info) &&
	    (priv->adapter->config_bands & BAND_GN ||
	     priv->adapter->config_bands & BAND_AN)) {
		ht_cap = (struct mwifiex_ie_types_htcap *) tlv_pos;
		memset(ht_cap, 0, sizeof(struct mwifiex_ie_types_htcap));
		ht_cap->header.type = cpu_to_le16(WLAN_EID_HT_CAPABILITY);
		ht_cap->header.len =
				cpu_to_le16(sizeof(struct ieee80211_ht_cap));
		radio_type =
			mwifiex_band_to_radio_type(priv->adapter->config_bands);
		mwifiex_fill_cap_info(priv, radio_type, ht_cap);
		tlv_pos += sizeof(struct mwifiex_ie_types_htcap);
	}

	/* Append vendor specific IE TLV */
	mwifiex_cmd_append_vsie_tlv(priv, MWIFIEX_VSIE_MASK_SCAN, &tlv_pos);

	/*
	 * Set the output for the channel TLV to the address in the tlv buffer
	 *   past any TLVs that were added in this function (SSID, num_probes).
	 *   Channel TLVs will be added past this for each scan command,
	 *   preserving the TLVs that were previously added.
	 */
	*chan_list_out =
		(struct mwifiex_ie_types_chan_list_param_set *) tlv_pos;

	if (user_scan_in && user_scan_in->chan_list[0].chan_number) {

		dev_dbg(adapter->dev, "info: Scan: Using supplied channel list\n");

		for (chan_idx = 0;
		     chan_idx < MWIFIEX_USER_SCAN_CHAN_MAX &&
		     user_scan_in->chan_list[chan_idx].chan_number;
		     chan_idx++) {

			channel = user_scan_in->chan_list[chan_idx].chan_number;
			(scan_chan_list + chan_idx)->chan_number = channel;

			radio_type =
				user_scan_in->chan_list[chan_idx].radio_type;
			(scan_chan_list + chan_idx)->radio_type = radio_type;

			scan_type = user_scan_in->chan_list[chan_idx].scan_type;

			if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
				(scan_chan_list +
				 chan_idx)->chan_scan_mode_bitmap
					|= MWIFIEX_PASSIVE_SCAN;
			else
				(scan_chan_list +
				 chan_idx)->chan_scan_mode_bitmap
					&= ~MWIFIEX_PASSIVE_SCAN;

			if (*filtered_scan)
				(scan_chan_list +
				 chan_idx)->chan_scan_mode_bitmap
					|= MWIFIEX_DISABLE_CHAN_FILT;

			if (user_scan_in->chan_list[chan_idx].scan_time) {
				scan_dur = (u16) user_scan_in->
					chan_list[chan_idx].scan_time;
			} else {
				if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
					scan_dur = adapter->passive_scan_time;
				else if (*filtered_scan)
					scan_dur = adapter->specific_scan_time;
				else
					scan_dur = adapter->active_scan_time;
			}

			(scan_chan_list + chan_idx)->min_scan_time =
				cpu_to_le16(scan_dur);
			(scan_chan_list + chan_idx)->max_scan_time =
				cpu_to_le16(scan_dur);
		}

		/* Check if we are only scanning the current channel */
		if ((chan_idx == 1) &&
		    (user_scan_in->chan_list[0].chan_number ==
		     priv->curr_bss_params.bss_descriptor.channel)) {
			*scan_current_only = true;
			dev_dbg(adapter->dev,
				"info: Scan: Scanning current channel only\n");
		}
		chan_num = chan_idx;
	} else {
		dev_dbg(adapter->dev,
			"info: Scan: Creating full region channel list\n");
		chan_num = mwifiex_scan_create_channel_list(priv, user_scan_in,
							    scan_chan_list,
							    *filtered_scan);
	}

	/*
	 * In associated state we will reduce the number of channels scanned per
	 * scan command to avoid any traffic delay/loss. This number is decided
	 * based on total number of channels to be scanned due to constraints
	 * of command buffers.
	 */
	if (priv->media_connected) {
		if (chan_num < MWIFIEX_LIMIT_1_CHANNEL_PER_SCAN_CMD)
			*max_chan_per_scan = 1;
		else if (chan_num < MWIFIEX_LIMIT_2_CHANNELS_PER_SCAN_CMD)
			*max_chan_per_scan = 2;
		else if (chan_num < MWIFIEX_LIMIT_3_CHANNELS_PER_SCAN_CMD)
			*max_chan_per_scan = 3;
		else
			*max_chan_per_scan = 4;
	}
}

/*
 * This function inspects the scan response buffer for pointers to
 * expected TLVs.
 *
 * TLVs can be included at the end of the scan response BSS information.
 *
 * Data in the buffer is parsed pointers to TLVs that can potentially
 * be passed back in the response.
 */
static void
mwifiex_ret_802_11_scan_get_tlv_ptrs(struct mwifiex_adapter *adapter,
				     struct mwifiex_ie_types_data *tlv,
				     u32 tlv_buf_size, u32 req_tlv_type,
				     struct mwifiex_ie_types_data **tlv_data)
{
	struct mwifiex_ie_types_data *current_tlv;
	u32 tlv_buf_left;
	u32 tlv_type;
	u32 tlv_len;

	current_tlv = tlv;
	tlv_buf_left = tlv_buf_size;
	*tlv_data = NULL;

	dev_dbg(adapter->dev, "info: SCAN_RESP: tlv_buf_size = %d\n",
		tlv_buf_size);

	while (tlv_buf_left >= sizeof(struct mwifiex_ie_types_header)) {

		tlv_type = le16_to_cpu(current_tlv->header.type);
		tlv_len = le16_to_cpu(current_tlv->header.len);

		if (sizeof(tlv->header) + tlv_len > tlv_buf_left) {
			dev_err(adapter->dev, "SCAN_RESP: TLV buffer corrupt\n");
			break;
		}

		if (req_tlv_type == tlv_type) {
			switch (tlv_type) {
			case TLV_TYPE_TSFTIMESTAMP:
				dev_dbg(adapter->dev, "info: SCAN_RESP: TSF "
					"timestamp TLV, len = %d\n", tlv_len);
				*tlv_data = current_tlv;
				break;
			case TLV_TYPE_CHANNELBANDLIST:
				dev_dbg(adapter->dev, "info: SCAN_RESP: channel"
					" band list TLV, len = %d\n", tlv_len);
				*tlv_data = current_tlv;
				break;
			default:
				dev_err(adapter->dev,
					"SCAN_RESP: unhandled TLV = %d\n",
				       tlv_type);
				/* Give up, this seems corrupted */
				return;
			}
		}

		if (*tlv_data)
			break;


		tlv_buf_left -= (sizeof(tlv->header) + tlv_len);
		current_tlv =
			(struct mwifiex_ie_types_data *) (current_tlv->data +
							  tlv_len);

	}			/* while */
}

/*
 * This function parses provided beacon buffer and updates
 * respective fields in bss descriptor structure.
 */
int mwifiex_update_bss_desc_with_ie(struct mwifiex_adapter *adapter,
				    struct mwifiex_bssdescriptor *bss_entry)
{
	int ret = 0;
	u8 element_id;
	struct ieee_types_fh_param_set *fh_param_set;
	struct ieee_types_ds_param_set *ds_param_set;
	struct ieee_types_cf_param_set *cf_param_set;
	struct ieee_types_ibss_param_set *ibss_param_set;
	u8 *current_ptr;
	u8 *rate;
	u8 element_len;
	u16 total_ie_len;
	u8 bytes_to_copy;
	u8 rate_size;
	u8 found_data_rate_ie;
	u32 bytes_left;
	struct ieee_types_vendor_specific *vendor_ie;
	const u8 wpa_oui[4] = { 0x00, 0x50, 0xf2, 0x01 };
	const u8 wmm_oui[4] = { 0x00, 0x50, 0xf2, 0x02 };

	found_data_rate_ie = false;
	rate_size = 0;
	current_ptr = bss_entry->beacon_buf;
	bytes_left = bss_entry->beacon_buf_size;

	/* Process variable IE */
	while (bytes_left >= 2) {
		element_id = *current_ptr;
		element_len = *(current_ptr + 1);
		total_ie_len = element_len + sizeof(struct ieee_types_header);

		if (bytes_left < total_ie_len) {
			dev_err(adapter->dev, "err: InterpretIE: in processing"
				" IE, bytes left < IE length\n");
			return -1;
		}
		switch (element_id) {
		case WLAN_EID_SSID:
			bss_entry->ssid.ssid_len = element_len;
			memcpy(bss_entry->ssid.ssid, (current_ptr + 2),
			       element_len);
			dev_dbg(adapter->dev,
				"info: InterpretIE: ssid: %-32s\n",
				bss_entry->ssid.ssid);
			break;

		case WLAN_EID_SUPP_RATES:
			memcpy(bss_entry->data_rates, current_ptr + 2,
			       element_len);
			memcpy(bss_entry->supported_rates, current_ptr + 2,
			       element_len);
			rate_size = element_len;
			found_data_rate_ie = true;
			break;

		case WLAN_EID_FH_PARAMS:
			fh_param_set =
				(struct ieee_types_fh_param_set *) current_ptr;
			memcpy(&bss_entry->phy_param_set.fh_param_set,
			       fh_param_set,
			       sizeof(struct ieee_types_fh_param_set));
			break;

		case WLAN_EID_DS_PARAMS:
			ds_param_set =
				(struct ieee_types_ds_param_set *) current_ptr;

			bss_entry->channel = ds_param_set->current_chan;

			memcpy(&bss_entry->phy_param_set.ds_param_set,
			       ds_param_set,
			       sizeof(struct ieee_types_ds_param_set));
			break;

		case WLAN_EID_CF_PARAMS:
			cf_param_set =
				(struct ieee_types_cf_param_set *) current_ptr;
			memcpy(&bss_entry->ss_param_set.cf_param_set,
			       cf_param_set,
			       sizeof(struct ieee_types_cf_param_set));
			break;

		case WLAN_EID_IBSS_PARAMS:
			ibss_param_set =
				(struct ieee_types_ibss_param_set *)
				current_ptr;
			memcpy(&bss_entry->ss_param_set.ibss_param_set,
			       ibss_param_set,
			       sizeof(struct ieee_types_ibss_param_set));
			break;

		case WLAN_EID_ERP_INFO:
			bss_entry->erp_flags = *(current_ptr + 2);
			break;

		case WLAN_EID_EXT_SUPP_RATES:
			/*
			 * Only process extended supported rate
			 * if data rate is already found.
			 * Data rate IE should come before
			 * extended supported rate IE
			 */
			if (found_data_rate_ie) {
				if ((element_len + rate_size) >
				    MWIFIEX_SUPPORTED_RATES)
					bytes_to_copy =
						(MWIFIEX_SUPPORTED_RATES -
						 rate_size);
				else
					bytes_to_copy = element_len;

				rate = (u8 *) bss_entry->data_rates;
				rate += rate_size;
				memcpy(rate, current_ptr + 2, bytes_to_copy);

				rate = (u8 *) bss_entry->supported_rates;
				rate += rate_size;
				memcpy(rate, current_ptr + 2, bytes_to_copy);
			}
			break;

		case WLAN_EID_VENDOR_SPECIFIC:
			vendor_ie = (struct ieee_types_vendor_specific *)
					current_ptr;

			if (!memcmp
			    (vendor_ie->vend_hdr.oui, wpa_oui,
			     sizeof(wpa_oui))) {
				bss_entry->bcn_wpa_ie =
					(struct ieee_types_vendor_specific *)
					current_ptr;
				bss_entry->wpa_offset = (u16)
					(current_ptr - bss_entry->beacon_buf);
			} else if (!memcmp(vendor_ie->vend_hdr.oui, wmm_oui,
				    sizeof(wmm_oui))) {
				if (total_ie_len ==
				    sizeof(struct ieee_types_wmm_parameter) ||
				    total_ie_len ==
				    sizeof(struct ieee_types_wmm_info))
					/*
					 * Only accept and copy the WMM IE if
					 * it matches the size expected for the
					 * WMM Info IE or the WMM Parameter IE.
					 */
					memcpy((u8 *) &bss_entry->wmm_ie,
					       current_ptr, total_ie_len);
			}
			break;
		case WLAN_EID_RSN:
			bss_entry->bcn_rsn_ie =
				(struct ieee_types_generic *) current_ptr;
			bss_entry->rsn_offset = (u16) (current_ptr -
							bss_entry->beacon_buf);
			break;
		case WLAN_EID_BSS_AC_ACCESS_DELAY:
			bss_entry->bcn_wapi_ie =
				(struct ieee_types_generic *) current_ptr;
			bss_entry->wapi_offset = (u16) (current_ptr -
							bss_entry->beacon_buf);
			break;
		case WLAN_EID_HT_CAPABILITY:
			bss_entry->bcn_ht_cap = (struct ieee80211_ht_cap *)
					(current_ptr +
					sizeof(struct ieee_types_header));
			bss_entry->ht_cap_offset = (u16) (current_ptr +
					sizeof(struct ieee_types_header) -
					bss_entry->beacon_buf);
			break;
		case WLAN_EID_HT_OPERATION:
			bss_entry->bcn_ht_oper =
				(struct ieee80211_ht_operation *)(current_ptr +
					sizeof(struct ieee_types_header));
			bss_entry->ht_info_offset = (u16) (current_ptr +
					sizeof(struct ieee_types_header) -
					bss_entry->beacon_buf);
			break;
		case WLAN_EID_BSS_COEX_2040:
			bss_entry->bcn_bss_co_2040 = current_ptr +
				sizeof(struct ieee_types_header);
			bss_entry->bss_co_2040_offset = (u16) (current_ptr +
					sizeof(struct ieee_types_header) -
						bss_entry->beacon_buf);
			break;
		case WLAN_EID_EXT_CAPABILITY:
			bss_entry->bcn_ext_cap = current_ptr +
				sizeof(struct ieee_types_header);
			bss_entry->ext_cap_offset = (u16) (current_ptr +
					sizeof(struct ieee_types_header) -
					bss_entry->beacon_buf);
			break;
		default:
			break;
		}

		current_ptr += element_len + 2;

		/* Need to account for IE ID and IE Len */
		bytes_left -= (element_len + 2);

	}	/* while (bytes_left > 2) */
	return ret;
}

/*
 * This function converts radio type scan parameter to a band configuration
 * to be used in join command.
 */
static u8
mwifiex_radio_type_to_band(u8 radio_type)
{
	switch (radio_type) {
	case HostCmd_SCAN_RADIO_TYPE_A:
		return BAND_A;
	case HostCmd_SCAN_RADIO_TYPE_BG:
	default:
		return BAND_G;
	}
}

/*
 * This is an internal function used to start a scan based on an input
 * configuration.
 *
 * This uses the input user scan configuration information when provided in
 * order to send the appropriate scan commands to firmware to populate or
 * update the internal driver scan table.
 */
int mwifiex_scan_networks(struct mwifiex_private *priv,
			  const struct mwifiex_user_scan_cfg *user_scan_in)
{
	int ret;
	struct mwifiex_adapter *adapter = priv->adapter;
	struct cmd_ctrl_node *cmd_node;
	union mwifiex_scan_cmd_config_tlv *scan_cfg_out;
	struct mwifiex_ie_types_chan_list_param_set *chan_list_out;
	u32 buf_size;
	struct mwifiex_chan_scan_param_set *scan_chan_list;
	u8 filtered_scan;
	u8 scan_current_chan_only;
	u8 max_chan_per_scan;
	unsigned long flags;

	if (adapter->scan_processing) {
		dev_err(adapter->dev, "cmd: Scan already in process...\n");
		return -EBUSY;
	}

	if (priv->scan_block) {
		dev_err(adapter->dev,
			"cmd: Scan is blocked during association...\n");
		return -EBUSY;
	}

	spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
	adapter->scan_processing = true;
	spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);

	scan_cfg_out = kzalloc(sizeof(union mwifiex_scan_cmd_config_tlv),
								GFP_KERNEL);
	if (!scan_cfg_out) {
		dev_err(adapter->dev, "failed to alloc scan_cfg_out\n");
		ret = -ENOMEM;
		goto done;
	}

	buf_size = sizeof(struct mwifiex_chan_scan_param_set) *
						MWIFIEX_USER_SCAN_CHAN_MAX;
	scan_chan_list = kzalloc(buf_size, GFP_KERNEL);
	if (!scan_chan_list) {
		dev_err(adapter->dev, "failed to alloc scan_chan_list\n");
		kfree(scan_cfg_out);
		ret = -ENOMEM;
		goto done;
	}

	mwifiex_config_scan(priv, user_scan_in, &scan_cfg_out->config,
			    &chan_list_out, scan_chan_list, &max_chan_per_scan,
			    &filtered_scan, &scan_current_chan_only);

	ret = mwifiex_scan_channel_list(priv, max_chan_per_scan, filtered_scan,
					&scan_cfg_out->config, chan_list_out,
					scan_chan_list);

	/* Get scan command from scan_pending_q and put to cmd_pending_q */
	if (!ret) {
		spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
		if (!list_empty(&adapter->scan_pending_q)) {
			cmd_node = list_first_entry(&adapter->scan_pending_q,
						    struct cmd_ctrl_node, list);
			list_del(&cmd_node->list);
			spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
					       flags);
			adapter->cmd_queued = cmd_node;
			mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
							true);
			queue_work(adapter->workqueue, &adapter->main_work);
		} else {
			spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
					       flags);
		}
	}

	kfree(scan_cfg_out);
	kfree(scan_chan_list);
done:
	if (ret) {
		spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
		adapter->scan_processing = false;
		spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
	}
	return ret;
}

/*
 * This function prepares a scan command to be sent to the firmware.
 *
 * This uses the scan command configuration sent to the command processing
 * module in command preparation stage to configure a scan command structure
 * to send to firmware.
 *
 * The fixed fields specifying the BSS type and BSSID filters as well as a
 * variable number/length of TLVs are sent in the command to firmware.
 *
 * Preparation also includes -
 *      - Setting command ID, and proper size
 *      - Ensuring correct endian-ness
 */
int mwifiex_cmd_802_11_scan(struct host_cmd_ds_command *cmd,
			    struct mwifiex_scan_cmd_config *scan_cfg)
{
	struct host_cmd_ds_802_11_scan *scan_cmd = &cmd->params.scan;

	/* Set fixed field variables in scan command */
	scan_cmd->bss_mode = scan_cfg->bss_mode;
	memcpy(scan_cmd->bssid, scan_cfg->specific_bssid,
	       sizeof(scan_cmd->bssid));
	memcpy(scan_cmd->tlv_buffer, scan_cfg->tlv_buf, scan_cfg->tlv_buf_len);

	cmd->command = cpu_to_le16(HostCmd_CMD_802_11_SCAN);

	/* Size is equal to the sizeof(fixed portions) + the TLV len + header */
	cmd->size = cpu_to_le16((u16) (sizeof(scan_cmd->bss_mode)
					  + sizeof(scan_cmd->bssid)
					  + scan_cfg->tlv_buf_len + S_DS_GEN));

	return 0;
}

/*
 * This function checks compatibility of requested network with current
 * driver settings.
 */
int mwifiex_check_network_compatibility(struct mwifiex_private *priv,
					struct mwifiex_bssdescriptor *bss_desc)
{
	int ret = -1;

	if (!bss_desc)
		return -1;

	if ((mwifiex_get_cfp(priv, (u8) bss_desc->bss_band,
			     (u16) bss_desc->channel, 0))) {
		switch (priv->bss_mode) {
		case NL80211_IFTYPE_STATION:
		case NL80211_IFTYPE_ADHOC:
			ret = mwifiex_is_network_compatible(priv, bss_desc,
							    priv->bss_mode);
			if (ret)
				dev_err(priv->adapter->dev,
					"Incompatible network settings\n");
			break;
		default:
			ret = 0;
		}
	}

	return ret;
}

static int mwifiex_update_curr_bss_params(struct mwifiex_private *priv,
					  struct cfg80211_bss *bss)
{
	struct mwifiex_bssdescriptor *bss_desc;
	int ret;
	unsigned long flags;

	/* Allocate and fill new bss descriptor */
	bss_desc = kzalloc(sizeof(struct mwifiex_bssdescriptor),
			GFP_KERNEL);
	if (!bss_desc) {
		dev_err(priv->adapter->dev, " failed to alloc bss_desc\n");
		return -ENOMEM;
	}

	ret = mwifiex_fill_new_bss_desc(priv, bss, bss_desc);
	if (ret)
		goto done;

	ret = mwifiex_check_network_compatibility(priv, bss_desc);
	if (ret)
		goto done;

	/* Update current bss descriptor parameters */
	spin_lock_irqsave(&priv->curr_bcn_buf_lock, flags);
	priv->curr_bss_params.bss_descriptor.bcn_wpa_ie = NULL;
	priv->curr_bss_params.bss_descriptor.wpa_offset = 0;
	priv->curr_bss_params.bss_descriptor.bcn_rsn_ie = NULL;
	priv->curr_bss_params.bss_descriptor.rsn_offset = 0;
	priv->curr_bss_params.bss_descriptor.bcn_wapi_ie = NULL;
	priv->curr_bss_params.bss_descriptor.wapi_offset = 0;
	priv->curr_bss_params.bss_descriptor.bcn_ht_cap = NULL;
	priv->curr_bss_params.bss_descriptor.ht_cap_offset =
		0;
	priv->curr_bss_params.bss_descriptor.bcn_ht_oper = NULL;
	priv->curr_bss_params.bss_descriptor.ht_info_offset =
		0;
	priv->curr_bss_params.bss_descriptor.bcn_bss_co_2040 =
		NULL;
	priv->curr_bss_params.bss_descriptor.
		bss_co_2040_offset = 0;
	priv->curr_bss_params.bss_descriptor.bcn_ext_cap = NULL;
	priv->curr_bss_params.bss_descriptor.ext_cap_offset = 0;
	priv->curr_bss_params.bss_descriptor.beacon_buf = NULL;
	priv->curr_bss_params.bss_descriptor.beacon_buf_size =
		0;

	/* Make a copy of current BSSID descriptor */
	memcpy(&priv->curr_bss_params.bss_descriptor, bss_desc,
	       sizeof(priv->curr_bss_params.bss_descriptor));
	mwifiex_save_curr_bcn(priv);
	spin_unlock_irqrestore(&priv->curr_bcn_buf_lock, flags);

done:
	kfree(bss_desc);
	return 0;
}

/*
 * This function handles the command response of scan.
 *
 * The response buffer for the scan command has the following
 * memory layout:
 *
 *      .-------------------------------------------------------------.
 *      |  Header (4 * sizeof(t_u16)):  Standard command response hdr |
 *      .-------------------------------------------------------------.
 *      |  BufSize (t_u16) : sizeof the BSS Description data          |
 *      .-------------------------------------------------------------.
 *      |  NumOfSet (t_u8) : Number of BSS Descs returned             |
 *      .-------------------------------------------------------------.
 *      |  BSSDescription data (variable, size given in BufSize)      |
 *      .-------------------------------------------------------------.
 *      |  TLV data (variable, size calculated using Header->Size,    |
 *      |            BufSize and sizeof the fixed fields above)       |
 *      .-------------------------------------------------------------.
 */
int mwifiex_ret_802_11_scan(struct mwifiex_private *priv,
			    struct host_cmd_ds_command *resp)
{
	int ret = 0;
	struct mwifiex_adapter *adapter = priv->adapter;
	struct cmd_ctrl_node *cmd_node;
	struct host_cmd_ds_802_11_scan_rsp *scan_rsp;
	struct mwifiex_ie_types_data *tlv_data;
	struct mwifiex_ie_types_tsf_timestamp *tsf_tlv;
	u8 *bss_info;
	u32 scan_resp_size;
	u32 bytes_left;
	u32 idx;
	u32 tlv_buf_size;
	struct mwifiex_chan_freq_power *cfp;
	struct mwifiex_ie_types_chan_band_list_param_set *chan_band_tlv;
	struct chan_band_param_set *chan_band;
	u8 is_bgscan_resp;
	unsigned long flags;
	struct cfg80211_bss *bss;

	is_bgscan_resp = (le16_to_cpu(resp->command)
			  == HostCmd_CMD_802_11_BG_SCAN_QUERY);
	if (is_bgscan_resp)
		scan_rsp = &resp->params.bg_scan_query_resp.scan_resp;
	else
		scan_rsp = &resp->params.scan_resp;


	if (scan_rsp->number_of_sets > MWIFIEX_MAX_AP) {
		dev_err(adapter->dev, "SCAN_RESP: too many AP returned (%d)\n",
			scan_rsp->number_of_sets);
		ret = -1;
		goto done;
	}

	bytes_left = le16_to_cpu(scan_rsp->bss_descript_size);
	dev_dbg(adapter->dev, "info: SCAN_RESP: bss_descript_size %d\n",
		bytes_left);

	scan_resp_size = le16_to_cpu(resp->size);

	dev_dbg(adapter->dev,
		"info: SCAN_RESP: returned %d APs before parsing\n",
		scan_rsp->number_of_sets);

	bss_info = scan_rsp->bss_desc_and_tlv_buffer;

	/*
	 * The size of the TLV buffer is equal to the entire command response
	 *   size (scan_resp_size) minus the fixed fields (sizeof()'s), the
	 *   BSS Descriptions (bss_descript_size as bytesLef) and the command
	 *   response header (S_DS_GEN)
	 */
	tlv_buf_size = scan_resp_size - (bytes_left
					 + sizeof(scan_rsp->bss_descript_size)
					 + sizeof(scan_rsp->number_of_sets)
					 + S_DS_GEN);

	tlv_data = (struct mwifiex_ie_types_data *) (scan_rsp->
						 bss_desc_and_tlv_buffer +
						 bytes_left);

	/* Search the TLV buffer space in the scan response for any valid
	   TLVs */
	mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
					     TLV_TYPE_TSFTIMESTAMP,
					     (struct mwifiex_ie_types_data **)
					     &tsf_tlv);

	/* Search the TLV buffer space in the scan response for any valid
	   TLVs */
	mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
					     TLV_TYPE_CHANNELBANDLIST,
					     (struct mwifiex_ie_types_data **)
					     &chan_band_tlv);

	for (idx = 0; idx < scan_rsp->number_of_sets && bytes_left; idx++) {
		u8 bssid[ETH_ALEN];
		s32 rssi;
		const u8 *ie_buf;
		size_t ie_len;
		u16 channel = 0;
		u64 fw_tsf = 0;
		u16 beacon_size = 0;
		u32 curr_bcn_bytes;
		u32 freq;
		u16 beacon_period;
		u16 cap_info_bitmap;
		u8 *current_ptr;
		u64 timestamp;
		struct mwifiex_bcn_param *bcn_param;
		struct mwifiex_bss_priv *bss_priv;

		if (bytes_left >= sizeof(beacon_size)) {
			/* Extract & convert beacon size from command buffer */
			memcpy(&beacon_size, bss_info, sizeof(beacon_size));
			bytes_left -= sizeof(beacon_size);
			bss_info += sizeof(beacon_size);
		}

		if (!beacon_size || beacon_size > bytes_left) {
			bss_info += bytes_left;
			bytes_left = 0;
			return -1;
		}

		/* Initialize the current working beacon pointer for this BSS
		 * iteration */
		current_ptr = bss_info;

		/* Advance the return beacon pointer past the current beacon */
		bss_info += beacon_size;
		bytes_left -= beacon_size;

		curr_bcn_bytes = beacon_size;

		/*
		 * First 5 fields are bssid, RSSI, time stamp, beacon interval,
		 *   and capability information
		 */
		if (curr_bcn_bytes < sizeof(struct mwifiex_bcn_param)) {
			dev_err(adapter->dev,
				"InterpretIE: not enough bytes left\n");
			continue;
		}
		bcn_param = (struct mwifiex_bcn_param *)current_ptr;
		current_ptr += sizeof(*bcn_param);
		curr_bcn_bytes -= sizeof(*bcn_param);

		memcpy(bssid, bcn_param->bssid, ETH_ALEN);

		rssi = (s32) bcn_param->rssi;
		rssi = (-rssi) * 100;		/* Convert dBm to mBm */
		dev_dbg(adapter->dev, "info: InterpretIE: RSSI=%d\n", rssi);

		timestamp = le64_to_cpu(bcn_param->timestamp);
		beacon_period = le16_to_cpu(bcn_param->beacon_period);

		cap_info_bitmap = le16_to_cpu(bcn_param->cap_info_bitmap);
		dev_dbg(adapter->dev, "info: InterpretIE: capabilities=0x%X\n",
			cap_info_bitmap);

		/* Rest of the current buffer are IE's */
		ie_buf = current_ptr;
		ie_len = curr_bcn_bytes;
		dev_dbg(adapter->dev,
			"info: InterpretIE: IELength for this AP = %d\n",
			curr_bcn_bytes);

		while (curr_bcn_bytes >= sizeof(struct ieee_types_header)) {
			u8 element_id, element_len;

			element_id = *current_ptr;
			element_len = *(current_ptr + 1);
			if (curr_bcn_bytes < element_len +
					sizeof(struct ieee_types_header)) {
				dev_err(priv->adapter->dev,
					"%s: bytes left < IE length\n",
					__func__);
				goto done;
			}
			if (element_id == WLAN_EID_DS_PARAMS) {
				channel = *(current_ptr + sizeof(struct ieee_types_header));
				break;
			}

			current_ptr += element_len +
					sizeof(struct ieee_types_header);
			curr_bcn_bytes -= element_len +
					sizeof(struct ieee_types_header);
		}

		/*
		 * If the TSF TLV was appended to the scan results, save this
		 * entry's TSF value in the fw_tsf field. It is the firmware's
		 * TSF value at the time the beacon or probe response was
		 * received.
		 */
		if (tsf_tlv)
			memcpy(&fw_tsf, &tsf_tlv->tsf_data[idx * TSF_DATA_SIZE],
			       sizeof(fw_tsf));

		if (channel) {
			struct ieee80211_channel *chan;
			u8 band;

			band = BAND_G;
			if (chan_band_tlv) {
				chan_band =
					&chan_band_tlv->chan_band_param[idx];
				band = mwifiex_radio_type_to_band(
						chan_band->radio_type
						& (BIT(0) | BIT(1)));
			}

			cfp = mwifiex_get_cfp(priv, band, channel, 0);

			freq = cfp ? cfp->freq : 0;

			chan = ieee80211_get_channel(priv->wdev->wiphy, freq);

			if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
				bss = cfg80211_inform_bss(priv->wdev->wiphy,
					      chan, bssid, timestamp,
					      cap_info_bitmap, beacon_period,
					      ie_buf, ie_len, rssi, GFP_KERNEL);
				bss_priv = (struct mwifiex_bss_priv *)bss->priv;
				bss_priv->band = band;
				bss_priv->fw_tsf = fw_tsf;
				if (priv->media_connected &&
				    !memcmp(bssid,
					    priv->curr_bss_params.bss_descriptor
					    .mac_address, ETH_ALEN))
					mwifiex_update_curr_bss_params(priv,
								       bss);
				cfg80211_put_bss(bss);
			}
		} else {
			dev_dbg(adapter->dev, "missing BSS channel IE\n");
		}
	}

	spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
	if (list_empty(&adapter->scan_pending_q)) {
		spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
		spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
		adapter->scan_processing = false;
		spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);

		/* Need to indicate IOCTL complete */
		if (adapter->curr_cmd->wait_q_enabled) {
			adapter->cmd_wait_q.status = 0;
			mwifiex_complete_cmd(adapter, adapter->curr_cmd);
		}
		if (priv->report_scan_result)
			priv->report_scan_result = false;

		if (priv->user_scan_cfg) {
			if (priv->scan_request) {
				dev_dbg(priv->adapter->dev,
					"info: notifying scan done\n");
				cfg80211_scan_done(priv->scan_request, 0);
				priv->scan_request = NULL;
			} else {
				dev_dbg(priv->adapter->dev,
					"info: scan already aborted\n");
			}

			kfree(priv->user_scan_cfg);
			priv->user_scan_cfg = NULL;
		}
	} else {
		if (priv->user_scan_cfg && !priv->scan_request) {
			spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
					       flags);
			adapter->scan_delay_cnt = MWIFIEX_MAX_SCAN_DELAY_CNT;
			mod_timer(&priv->scan_delay_timer, jiffies);
			dev_dbg(priv->adapter->dev,
				"info: %s: triggerring scan abort\n", __func__);
		} else if (!mwifiex_wmm_lists_empty(adapter) &&
			   (priv->scan_request && (priv->scan_request->flags &
					    NL80211_SCAN_FLAG_LOW_PRIORITY))) {
			spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
					       flags);
			adapter->scan_delay_cnt = 1;
			mod_timer(&priv->scan_delay_timer, jiffies +
				  msecs_to_jiffies(MWIFIEX_SCAN_DELAY_MSEC));
			dev_dbg(priv->adapter->dev,
				"info: %s: deferring scan\n", __func__);
		} else {
			/* Get scan command from scan_pending_q and put to
			   cmd_pending_q */
			cmd_node = list_first_entry(&adapter->scan_pending_q,
						    struct cmd_ctrl_node, list);
			list_del(&cmd_node->list);
			spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
					       flags);
			mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
							true);
		}
	}

done:
	return ret;
}

/*
 * This function prepares command for background scan query.
 *
 * Preparation includes -
 *      - Setting command ID and proper size
 *      - Setting background scan flush parameter
 *      - Ensuring correct endian-ness
 */
int mwifiex_cmd_802_11_bg_scan_query(struct host_cmd_ds_command *cmd)
{
	struct host_cmd_ds_802_11_bg_scan_query *bg_query =
		&cmd->params.bg_scan_query;

	cmd->command = cpu_to_le16(HostCmd_CMD_802_11_BG_SCAN_QUERY);
	cmd->size = cpu_to_le16(sizeof(struct host_cmd_ds_802_11_bg_scan_query)
				+ S_DS_GEN);

	bg_query->flush = 1;

	return 0;
}

/*
 * This function inserts scan command node to the scan pending queue.
 */
void
mwifiex_queue_scan_cmd(struct mwifiex_private *priv,
		       struct cmd_ctrl_node *cmd_node)
{
	struct mwifiex_adapter *adapter = priv->adapter;
	unsigned long flags;

	cmd_node->wait_q_enabled = true;
	cmd_node->condition = &adapter->scan_wait_q_woken;
	spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
	list_add_tail(&cmd_node->list, &adapter->scan_pending_q);
	spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
}

/*
 * This function sends a scan command for all available channels to the
 * firmware, filtered on a specific SSID.
 */
static int mwifiex_scan_specific_ssid(struct mwifiex_private *priv,
				      struct cfg80211_ssid *req_ssid)
{
	struct mwifiex_adapter *adapter = priv->adapter;
	int ret;
	struct mwifiex_user_scan_cfg *scan_cfg;

	if (adapter->scan_processing) {
		dev_err(adapter->dev, "cmd: Scan already in process...\n");
		return -EBUSY;
	}

	if (priv->scan_block) {
		dev_err(adapter->dev,
			"cmd: Scan is blocked during association...\n");
		return -EBUSY;
	}

	scan_cfg = kzalloc(sizeof(struct mwifiex_user_scan_cfg), GFP_KERNEL);
	if (!scan_cfg) {
		dev_err(adapter->dev, "failed to alloc scan_cfg\n");
		return -ENOMEM;
	}

	scan_cfg->ssid_list = req_ssid;
	scan_cfg->num_ssids = 1;

	ret = mwifiex_scan_networks(priv, scan_cfg);

	kfree(scan_cfg);
	return ret;
}

/*
 * Sends IOCTL request to start a scan.
 *
 * This function allocates the IOCTL request buffer, fills it
 * with requisite parameters and calls the IOCTL handler.
 *
 * Scan command can be issued for both normal scan and specific SSID
 * scan, depending upon whether an SSID is provided or not.
 */
int mwifiex_request_scan(struct mwifiex_private *priv,
			 struct cfg80211_ssid *req_ssid)
{
	int ret;

	if (down_interruptible(&priv->async_sem)) {
		dev_err(priv->adapter->dev, "%s: acquire semaphore\n",
			__func__);
		return -1;
	}

	priv->adapter->scan_wait_q_woken = false;

	if (req_ssid && req_ssid->ssid_len != 0)
		/* Specific SSID scan */
		ret = mwifiex_scan_specific_ssid(priv, req_ssid);
	else
		/* Normal scan */
		ret = mwifiex_scan_networks(priv, NULL);

	if (!ret)
		ret = mwifiex_wait_queue_complete(priv->adapter);

	up(&priv->async_sem);

	return ret;
}

/*
 * This function appends the vendor specific IE TLV to a buffer.
 */
int
mwifiex_cmd_append_vsie_tlv(struct mwifiex_private *priv,
			    u16 vsie_mask, u8 **buffer)
{
	int id, ret_len = 0;
	struct mwifiex_ie_types_vendor_param_set *vs_param_set;

	if (!buffer)
		return 0;
	if (!(*buffer))
		return 0;

	/*
	 * Traverse through the saved vendor specific IE array and append
	 * the selected(scan/assoc/adhoc) IE as TLV to the command
	 */
	for (id = 0; id < MWIFIEX_MAX_VSIE_NUM; id++) {
		if (priv->vs_ie[id].mask & vsie_mask) {
			vs_param_set =
				(struct mwifiex_ie_types_vendor_param_set *)
				*buffer;
			vs_param_set->header.type =
				cpu_to_le16(TLV_TYPE_PASSTHROUGH);
			vs_param_set->header.len =
				cpu_to_le16((((u16) priv->vs_ie[id].ie[1])
				& 0x00FF) + 2);
			memcpy(vs_param_set->ie, priv->vs_ie[id].ie,
			       le16_to_cpu(vs_param_set->header.len));
			*buffer += le16_to_cpu(vs_param_set->header.len) +
				   sizeof(struct mwifiex_ie_types_header);
			ret_len += le16_to_cpu(vs_param_set->header.len) +
				   sizeof(struct mwifiex_ie_types_header);
		}
	}
	return ret_len;
}

/*
 * This function saves a beacon buffer of the current BSS descriptor.
 *
 * The current beacon buffer is saved so that it can be restored in the
 * following cases that makes the beacon buffer not to contain the current
 * ssid's beacon buffer.
 *      - The current ssid was not found somehow in the last scan.
 *      - The current ssid was the last entry of the scan table and overloaded.
 */
void
mwifiex_save_curr_bcn(struct mwifiex_private *priv)
{
	struct mwifiex_bssdescriptor *curr_bss =
		&priv->curr_bss_params.bss_descriptor;

	if (!curr_bss->beacon_buf_size)
		return;

	/* allocate beacon buffer at 1st time; or if it's size has changed */
	if (!priv->curr_bcn_buf ||
	    priv->curr_bcn_size != curr_bss->beacon_buf_size) {
		priv->curr_bcn_size = curr_bss->beacon_buf_size;

		kfree(priv->curr_bcn_buf);
		priv->curr_bcn_buf = kmalloc(curr_bss->beacon_buf_size,
					     GFP_ATOMIC);
		if (!priv->curr_bcn_buf) {
			dev_err(priv->adapter->dev,
				"failed to alloc curr_bcn_buf\n");
			return;
		}
	}

	memcpy(priv->curr_bcn_buf, curr_bss->beacon_buf,
	       curr_bss->beacon_buf_size);
	dev_dbg(priv->adapter->dev, "info: current beacon saved %d\n",
		priv->curr_bcn_size);

	curr_bss->beacon_buf = priv->curr_bcn_buf;

	/* adjust the pointers in the current BSS descriptor */
	if (curr_bss->bcn_wpa_ie)
		curr_bss->bcn_wpa_ie =
			(struct ieee_types_vendor_specific *)
			(curr_bss->beacon_buf +
			 curr_bss->wpa_offset);

	if (curr_bss->bcn_rsn_ie)
		curr_bss->bcn_rsn_ie = (struct ieee_types_generic *)
			(curr_bss->beacon_buf +
			 curr_bss->rsn_offset);

	if (curr_bss->bcn_ht_cap)
		curr_bss->bcn_ht_cap = (struct ieee80211_ht_cap *)
			(curr_bss->beacon_buf +
			 curr_bss->ht_cap_offset);

	if (curr_bss->bcn_ht_oper)
		curr_bss->bcn_ht_oper = (struct ieee80211_ht_operation *)
			(curr_bss->beacon_buf +
			 curr_bss->ht_info_offset);

	if (curr_bss->bcn_bss_co_2040)
		curr_bss->bcn_bss_co_2040 =
			(curr_bss->beacon_buf + curr_bss->bss_co_2040_offset);

	if (curr_bss->bcn_ext_cap)
		curr_bss->bcn_ext_cap = curr_bss->beacon_buf +
			curr_bss->ext_cap_offset;
}

/*
 * This function frees the current BSS descriptor beacon buffer.
 */
void
mwifiex_free_curr_bcn(struct mwifiex_private *priv)
{
	kfree(priv->curr_bcn_buf);
	priv->curr_bcn_buf = NULL;
}
OpenPOWER on IntegriCloud