aboutsummaryrefslogtreecommitdiffstats
path: root/net/ieee80211/ieee80211_rx.c
blob: 2f4b16c1c14359702b388b4402d44c0cb5a9a57a (plain) (blame)
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
/*
 * Original code based Host AP (software wireless LAN access point) driver
 * for Intersil Prism2/2.5/3 - hostap.o module, common routines
 *
 * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
 * <jkmaline@cc.hut.fi>
 * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
 * Copyright (c) 2004-2005, Intel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation. See README and COPYING for
 * more details.
 */

#include <linux/compiler.h>
#include <linux/config.h>
#include <linux/errno.h>
#include <linux/if_arp.h>
#include <linux/in6.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/proc_fs.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/tcp.h>
#include <linux/types.h>
#include <linux/version.h>
#include <linux/wireless.h>
#include <linux/etherdevice.h>
#include <asm/uaccess.h>
#include <linux/ctype.h>

#include <net/ieee80211.h>

static inline void ieee80211_monitor_rx(struct ieee80211_device *ieee,
					struct sk_buff *skb,
					struct ieee80211_rx_stats *rx_stats)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	u16 fc = le16_to_cpu(hdr->frame_ctl);

	skb->dev = ieee->dev;
	skb->mac.raw = skb->data;
	skb_pull(skb, ieee80211_get_hdrlen(fc));
	skb->pkt_type = PACKET_OTHERHOST;
	skb->protocol = __constant_htons(ETH_P_80211_RAW);
	memset(skb->cb, 0, sizeof(skb->cb));
	netif_rx(skb);
}

/* Called only as a tasklet (software IRQ) */
static struct ieee80211_frag_entry *ieee80211_frag_cache_find(struct
							      ieee80211_device
							      *ieee,
							      unsigned int seq,
							      unsigned int frag,
							      u8 * src,
							      u8 * dst)
{
	struct ieee80211_frag_entry *entry;
	int i;

	for (i = 0; i < IEEE80211_FRAG_CACHE_LEN; i++) {
		entry = &ieee->frag_cache[i];
		if (entry->skb != NULL &&
		    time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
			IEEE80211_DEBUG_FRAG("expiring fragment cache entry "
					     "seq=%u last_frag=%u\n",
					     entry->seq, entry->last_frag);
			dev_kfree_skb_any(entry->skb);
			entry->skb = NULL;
		}

		if (entry->skb != NULL && entry->seq == seq &&
		    (entry->last_frag + 1 == frag || frag == -1) &&
		    memcmp(entry->src_addr, src, ETH_ALEN) == 0 &&
		    memcmp(entry->dst_addr, dst, ETH_ALEN) == 0)
			return entry;
	}

	return NULL;
}

/* Called only as a tasklet (software IRQ) */
static struct sk_buff *ieee80211_frag_cache_get(struct ieee80211_device *ieee,
						struct ieee80211_hdr_4addr *hdr)
{
	struct sk_buff *skb = NULL;
	u16 sc;
	unsigned int frag, seq;
	struct ieee80211_frag_entry *entry;

	sc = le16_to_cpu(hdr->seq_ctl);
	frag = WLAN_GET_SEQ_FRAG(sc);
	seq = WLAN_GET_SEQ_SEQ(sc);

	if (frag == 0) {
		/* Reserve enough space to fit maximum frame length */
		skb = dev_alloc_skb(ieee->dev->mtu +
				    sizeof(struct ieee80211_hdr_4addr) +
				    8 /* LLC */  +
				    2 /* alignment */  +
				    8 /* WEP */  + ETH_ALEN /* WDS */ );
		if (skb == NULL)
			return NULL;

		entry = &ieee->frag_cache[ieee->frag_next_idx];
		ieee->frag_next_idx++;
		if (ieee->frag_next_idx >= IEEE80211_FRAG_CACHE_LEN)
			ieee->frag_next_idx = 0;

		if (entry->skb != NULL)
			dev_kfree_skb_any(entry->skb);

		entry->first_frag_time = jiffies;
		entry->seq = seq;
		entry->last_frag = frag;
		entry->skb = skb;
		memcpy(entry->src_addr, hdr->addr2, ETH_ALEN);
		memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN);
	} else {
		/* received a fragment of a frame for which the head fragment
		 * should have already been received */
		entry = ieee80211_frag_cache_find(ieee, seq, frag, hdr->addr2,
						  hdr->addr1);
		if (entry != NULL) {
			entry->last_frag = frag;
			skb = entry->skb;
		}
	}

	return skb;
}

/* Called only as a tasklet (software IRQ) */
static int ieee80211_frag_cache_invalidate(struct ieee80211_device *ieee,
					   struct ieee80211_hdr_4addr *hdr)
{
	u16 sc;
	unsigned int seq;
	struct ieee80211_frag_entry *entry;

	sc = le16_to_cpu(hdr->seq_ctl);
	seq = WLAN_GET_SEQ_SEQ(sc);

	entry = ieee80211_frag_cache_find(ieee, seq, -1, hdr->addr2,
					  hdr->addr1);

	if (entry == NULL) {
		IEEE80211_DEBUG_FRAG("could not invalidate fragment cache "
				     "entry (seq=%u)\n", seq);
		return -1;
	}

	entry->skb = NULL;
	return 0;
}

#ifdef NOT_YET
/* ieee80211_rx_frame_mgtmt
 *
 * Responsible for handling management control frames
 *
 * Called by ieee80211_rx */
static inline int
ieee80211_rx_frame_mgmt(struct ieee80211_device *ieee, struct sk_buff *skb,
			struct ieee80211_rx_stats *rx_stats, u16 type,
			u16 stype)
{
	if (ieee->iw_mode == IW_MODE_MASTER) {
		printk(KERN_DEBUG "%s: Master mode not yet suppported.\n",
		       ieee->dev->name);
		return 0;
/*
  hostap_update_sta_ps(ieee, (struct hostap_ieee80211_hdr_4addr *)
  skb->data);*/
	}

	if (ieee->hostapd && type == WLAN_FC_TYPE_MGMT) {
		if (stype == WLAN_FC_STYPE_BEACON &&
		    ieee->iw_mode == IW_MODE_MASTER) {
			struct sk_buff *skb2;
			/* Process beacon frames also in kernel driver to
			 * update STA(AP) table statistics */
			skb2 = skb_clone(skb, GFP_ATOMIC);
			if (skb2)
				hostap_rx(skb2->dev, skb2, rx_stats);
		}

		/* send management frames to the user space daemon for
		 * processing */
		ieee->apdevstats.rx_packets++;
		ieee->apdevstats.rx_bytes += skb->len;
		prism2_rx_80211(ieee->apdev, skb, rx_stats, PRISM2_RX_MGMT);
		return 0;
	}

	if (ieee->iw_mode == IW_MODE_MASTER) {
		if (type != WLAN_FC_TYPE_MGMT && type != WLAN_FC_TYPE_CTRL) {
			printk(KERN_DEBUG "%s: unknown management frame "
			       "(type=0x%02x, stype=0x%02x) dropped\n",
			       skb->dev->name, type, stype);
			return -1;
		}

		hostap_rx(skb->dev, skb, rx_stats);
		return 0;
	}

	printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: management frame "
	       "received in non-Host AP mode\n", skb->dev->name);
	return -1;
}
#endif

/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
static unsigned char rfc1042_header[] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };

/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
static unsigned char bridge_tunnel_header[] =
    { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
/* No encapsulation header if EtherType < 0x600 (=length) */

/* Called by ieee80211_rx_frame_decrypt */
static int ieee80211_is_eapol_frame(struct ieee80211_device *ieee,
				    struct sk_buff *skb)
{
	struct net_device *dev = ieee->dev;
	u16 fc, ethertype;
	struct ieee80211_hdr_3addr *hdr;
	u8 *pos;

	if (skb->len < 24)
		return 0;

	hdr = (struct ieee80211_hdr_3addr *)skb->data;
	fc = le16_to_cpu(hdr->frame_ctl);

	/* check that the frame is unicast frame to us */
	if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
	    IEEE80211_FCTL_TODS &&
	    memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0 &&
	    memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0) {
		/* ToDS frame with own addr BSSID and DA */
	} else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
		   IEEE80211_FCTL_FROMDS &&
		   memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0) {
		/* FromDS frame with own addr as DA */
	} else
		return 0;

	if (skb->len < 24 + 8)
		return 0;

	/* check for port access entity Ethernet type */
	pos = skb->data + 24;
	ethertype = (pos[6] << 8) | pos[7];
	if (ethertype == ETH_P_PAE)
		return 1;

	return 0;
}

/* Called only as a tasklet (software IRQ), by ieee80211_rx */
static inline int
ieee80211_rx_frame_decrypt(struct ieee80211_device *ieee, struct sk_buff *skb,
			   struct ieee80211_crypt_data *crypt)
{
	struct ieee80211_hdr_3addr *hdr;
	int res, hdrlen;

	if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
		return 0;

	hdr = (struct ieee80211_hdr_3addr *)skb->data;
	hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));

	atomic_inc(&crypt->refcnt);
	res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
	atomic_dec(&crypt->refcnt);
	if (res < 0) {
		IEEE80211_DEBUG_DROP("decryption failed (SA=" MAC_FMT
				     ") res=%d\n", MAC_ARG(hdr->addr2), res);
		if (res == -2)
			IEEE80211_DEBUG_DROP("Decryption failed ICV "
					     "mismatch (key %d)\n",
					     skb->data[hdrlen + 3] >> 6);
		ieee->ieee_stats.rx_discards_undecryptable++;
		return -1;
	}

	return res;
}

/* Called only as a tasklet (software IRQ), by ieee80211_rx */
static inline int
ieee80211_rx_frame_decrypt_msdu(struct ieee80211_device *ieee,
				struct sk_buff *skb, int keyidx,
				struct ieee80211_crypt_data *crypt)
{
	struct ieee80211_hdr_3addr *hdr;
	int res, hdrlen;

	if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)
		return 0;

	hdr = (struct ieee80211_hdr_3addr *)skb->data;
	hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));

	atomic_inc(&crypt->refcnt);
	res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
	atomic_dec(&crypt->refcnt);
	if (res < 0) {
		printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed"
		       " (SA=" MAC_FMT " keyidx=%d)\n",
		       ieee->dev->name, MAC_ARG(hdr->addr2), keyidx);
		return -1;
	}

	return 0;
}

/* All received frames are sent to this function. @skb contains the frame in
 * IEEE 802.11 format, i.e., in the format it was sent over air.
 * This function is called only as a tasklet (software IRQ). */
int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb,
		 struct ieee80211_rx_stats *rx_stats)
{
	struct net_device *dev = ieee->dev;
	struct ieee80211_hdr_4addr *hdr;
	size_t hdrlen;
	u16 fc, type, stype, sc;
	struct net_device_stats *stats;
	unsigned int frag;
	u8 *payload;
	u16 ethertype;
#ifdef NOT_YET
	struct net_device *wds = NULL;
	struct sk_buff *skb2 = NULL;
	struct net_device *wds = NULL;
	int frame_authorized = 0;
	int from_assoc_ap = 0;
	void *sta = NULL;
#endif
	u8 dst[ETH_ALEN];
	u8 src[ETH_ALEN];
	struct ieee80211_crypt_data *crypt = NULL;
	int keyidx = 0;

	hdr = (struct ieee80211_hdr_4addr *)skb->data;
	stats = &ieee->stats;

	if (skb->len < 10) {
		printk(KERN_INFO "%s: SKB length < 10\n", dev->name);
		goto rx_dropped;
	}

	fc = le16_to_cpu(hdr->frame_ctl);
	type = WLAN_FC_GET_TYPE(fc);
	stype = WLAN_FC_GET_STYPE(fc);
	sc = le16_to_cpu(hdr->seq_ctl);
	frag = WLAN_GET_SEQ_FRAG(sc);
	hdrlen = ieee80211_get_hdrlen(fc);

	/* Put this code here so that we avoid duplicating it in all
	 * Rx paths. - Jean II */
#ifdef IW_WIRELESS_SPY		/* defined in iw_handler.h */
	/* If spy monitoring on */
	if (ieee->spy_data.spy_number > 0) {
		struct iw_quality wstats;

		wstats.updated = 0;
		if (rx_stats->mask & IEEE80211_STATMASK_RSSI) {
			wstats.level = rx_stats->rssi;
			wstats.updated |= IW_QUAL_LEVEL_UPDATED;
		} else
			wstats.updated |= IW_QUAL_LEVEL_INVALID;

		if (rx_stats->mask & IEEE80211_STATMASK_NOISE) {
			wstats.noise = rx_stats->noise;
			wstats.updated |= IW_QUAL_NOISE_UPDATED;
		} else
			wstats.updated |= IW_QUAL_NOISE_INVALID;

		if (rx_stats->mask & IEEE80211_STATMASK_SIGNAL) {
			wstats.qual = rx_stats->signal;
			wstats.updated |= IW_QUAL_QUAL_UPDATED;
		} else
			wstats.updated |= IW_QUAL_QUAL_INVALID;

		/* Update spy records */
		wireless_spy_update(ieee->dev, hdr->addr2, &wstats);
	}
#endif				/* IW_WIRELESS_SPY */

#ifdef NOT_YET
	hostap_update_rx_stats(local->ap, hdr, rx_stats);
#endif

	if (ieee->iw_mode == IW_MODE_MONITOR) {
		ieee80211_monitor_rx(ieee, skb, rx_stats);
		stats->rx_packets++;
		stats->rx_bytes += skb->len;
		return 1;
	}

	if (is_multicast_ether_addr(hdr->addr1) ? ieee->host_mc_decrypt :
	    ieee->host_decrypt) {
		int idx = 0;
		if (skb->len >= hdrlen + 3)
			idx = skb->data[hdrlen + 3] >> 6;
		crypt = ieee->crypt[idx];
#ifdef NOT_YET
		sta = NULL;

		/* Use station specific key to override default keys if the
		 * receiver address is a unicast address ("individual RA"). If
		 * bcrx_sta_key parameter is set, station specific key is used
		 * even with broad/multicast targets (this is against IEEE
		 * 802.11, but makes it easier to use different keys with
		 * stations that do not support WEP key mapping). */

		if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key)
			(void)hostap_handle_sta_crypto(local, hdr, &crypt,
						       &sta);
#endif

		/* allow NULL decrypt to indicate an station specific override
		 * for default encryption */
		if (crypt && (crypt->ops == NULL ||
			      crypt->ops->decrypt_mpdu == NULL))
			crypt = NULL;

		if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
			/* This seems to be triggered by some (multicast?)
			 * frames from other than current BSS, so just drop the
			 * frames silently instead of filling system log with
			 * these reports. */
			IEEE80211_DEBUG_DROP("Decryption failed (not set)"
					     " (SA=" MAC_FMT ")\n",
					     MAC_ARG(hdr->addr2));
			ieee->ieee_stats.rx_discards_undecryptable++;
			goto rx_dropped;
		}
	}
#ifdef NOT_YET
	if (type != WLAN_FC_TYPE_DATA) {
		if (type == WLAN_FC_TYPE_MGMT && stype == WLAN_FC_STYPE_AUTH &&
		    fc & IEEE80211_FCTL_PROTECTED && ieee->host_decrypt &&
		    (keyidx = hostap_rx_frame_decrypt(ieee, skb, crypt)) < 0) {
			printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth "
			       "from " MAC_FMT "\n", dev->name,
			       MAC_ARG(hdr->addr2));
			/* TODO: could inform hostapd about this so that it
			 * could send auth failure report */
			goto rx_dropped;
		}

		if (ieee80211_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
			goto rx_dropped;
		else
			goto rx_exit;
	}
#endif

	/* Data frame - extract src/dst addresses */
	if (skb->len < IEEE80211_3ADDR_LEN)
		goto rx_dropped;

	switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
	case IEEE80211_FCTL_FROMDS:
		memcpy(dst, hdr->addr1, ETH_ALEN);
		memcpy(src, hdr->addr3, ETH_ALEN);
		break;
	case IEEE80211_FCTL_TODS:
		memcpy(dst, hdr->addr3, ETH_ALEN);
		memcpy(src, hdr->addr2, ETH_ALEN);
		break;
	case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
		if (skb->len < IEEE80211_4ADDR_LEN)
			goto rx_dropped;
		memcpy(dst, hdr->addr3, ETH_ALEN);
		memcpy(src, hdr->addr4, ETH_ALEN);
		break;
	case 0:
		memcpy(dst, hdr->addr1, ETH_ALEN);
		memcpy(src, hdr->addr2, ETH_ALEN);
		break;
	}

#ifdef NOT_YET
	if (hostap_rx_frame_wds(ieee, hdr, fc, &wds))
		goto rx_dropped;
	if (wds) {
		skb->dev = dev = wds;
		stats = hostap_get_stats(dev);
	}

	if (ieee->iw_mode == IW_MODE_MASTER && !wds &&
	    (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
	    IEEE80211_FCTL_FROMDS && ieee->stadev
	    && memcmp(hdr->addr2, ieee->assoc_ap_addr, ETH_ALEN) == 0) {
		/* Frame from BSSID of the AP for which we are a client */
		skb->dev = dev = ieee->stadev;
		stats = hostap_get_stats(dev);
		from_assoc_ap = 1;
	}
#endif

	dev->last_rx = jiffies;

#ifdef NOT_YET
	if ((ieee->iw_mode == IW_MODE_MASTER ||
	     ieee->iw_mode == IW_MODE_REPEAT) && !from_assoc_ap) {
		switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats,
					     wds != NULL)) {
		case AP_RX_CONTINUE_NOT_AUTHORIZED:
			frame_authorized = 0;
			break;
		case AP_RX_CONTINUE:
			frame_authorized = 1;
			break;
		case AP_RX_DROP:
			goto rx_dropped;
		case AP_RX_EXIT:
			goto rx_exit;
		}
	}
#endif

	/* Nullfunc frames may have PS-bit set, so they must be passed to
	 * hostap_handle_sta_rx() before being dropped here. */

	stype &= ~IEEE80211_STYPE_QOS_DATA;

	if (stype != IEEE80211_STYPE_DATA &&
	    stype != IEEE80211_STYPE_DATA_CFACK &&
	    stype != IEEE80211_STYPE_DATA_CFPOLL &&
	    stype != IEEE80211_STYPE_DATA_CFACKPOLL) {
		if (stype != IEEE80211_STYPE_NULLFUNC)
			IEEE80211_DEBUG_DROP("RX: dropped data frame "
					     "with no data (type=0x%02x, "
					     "subtype=0x%02x, len=%d)\n",
					     type, stype, skb->len);
		goto rx_dropped;
	}

	/* skb: hdr + (possibly fragmented, possibly encrypted) payload */

	if (ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
	    (keyidx = ieee80211_rx_frame_decrypt(ieee, skb, crypt)) < 0)
		goto rx_dropped;

	hdr = (struct ieee80211_hdr_4addr *)skb->data;

	/* skb: hdr + (possibly fragmented) plaintext payload */
	// PR: FIXME: hostap has additional conditions in the "if" below:
	// ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
	if ((frag != 0 || (fc & IEEE80211_FCTL_MOREFRAGS))) {
		int flen;
		struct sk_buff *frag_skb = ieee80211_frag_cache_get(ieee, hdr);
		IEEE80211_DEBUG_FRAG("Rx Fragment received (%u)\n", frag);

		if (!frag_skb) {
			IEEE80211_DEBUG(IEEE80211_DL_RX | IEEE80211_DL_FRAG,
					"Rx cannot get skb from fragment "
					"cache (morefrag=%d seq=%u frag=%u)\n",
					(fc & IEEE80211_FCTL_MOREFRAGS) != 0,
					WLAN_GET_SEQ_SEQ(sc), frag);
			goto rx_dropped;
		}

		flen = skb->len;
		if (frag != 0)
			flen -= hdrlen;

		if (frag_skb->tail + flen > frag_skb->end) {
			printk(KERN_WARNING "%s: host decrypted and "
			       "reassembled frame did not fit skb\n",
			       dev->name);
			ieee80211_frag_cache_invalidate(ieee, hdr);
			goto rx_dropped;
		}

		if (frag == 0) {
			/* copy first fragment (including full headers) into
			 * beginning of the fragment cache skb */
			memcpy(skb_put(frag_skb, flen), skb->data, flen);
		} else {
			/* append frame payload to the end of the fragment
			 * cache skb */
			memcpy(skb_put(frag_skb, flen), skb->data + hdrlen,
			       flen);
		}
		dev_kfree_skb_any(skb);
		skb = NULL;

		if (fc & IEEE80211_FCTL_MOREFRAGS) {
			/* more fragments expected - leave the skb in fragment
			 * cache for now; it will be delivered to upper layers
			 * after all fragments have been received */
			goto rx_exit;
		}

		/* this was the last fragment and the frame will be
		 * delivered, so remove skb from fragment cache */
		skb = frag_skb;
		hdr = (struct ieee80211_hdr_4addr *)skb->data;
		ieee80211_frag_cache_invalidate(ieee, hdr);
	}

	/* skb: hdr + (possible reassembled) full MSDU payload; possibly still
	 * encrypted/authenticated */
	if (ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
	    ieee80211_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt))
		goto rx_dropped;

	hdr = (struct ieee80211_hdr_4addr *)skb->data;
	if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) {
		if (		/*ieee->ieee802_1x && */
			   ieee80211_is_eapol_frame(ieee, skb)) {
			/* pass unencrypted EAPOL frames even if encryption is
			 * configured */
		} else {
			IEEE80211_DEBUG_DROP("encryption configured, but RX "
					     "frame not encrypted (SA=" MAC_FMT
					     ")\n", MAC_ARG(hdr->addr2));
			goto rx_dropped;
		}
	}

	if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep &&
	    !ieee80211_is_eapol_frame(ieee, skb)) {
		IEEE80211_DEBUG_DROP("dropped unencrypted RX data "
				     "frame from " MAC_FMT
				     " (drop_unencrypted=1)\n",
				     MAC_ARG(hdr->addr2));
		goto rx_dropped;
	}

	/* skb: hdr + (possible reassembled) full plaintext payload */

	payload = skb->data + hdrlen;
	ethertype = (payload[6] << 8) | payload[7];

#ifdef NOT_YET
	/* If IEEE 802.1X is used, check whether the port is authorized to send
	 * the received frame. */
	if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) {
		if (ethertype == ETH_P_PAE) {
			printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n",
			       dev->name);
			if (ieee->hostapd && ieee->apdev) {
				/* Send IEEE 802.1X frames to the user
				 * space daemon for processing */
				prism2_rx_80211(ieee->apdev, skb, rx_stats,
						PRISM2_RX_MGMT);
				ieee->apdevstats.rx_packets++;
				ieee->apdevstats.rx_bytes += skb->len;
				goto rx_exit;
			}
		} else if (!frame_authorized) {
			printk(KERN_DEBUG "%s: dropped frame from "
			       "unauthorized port (IEEE 802.1X): "
			       "ethertype=0x%04x\n", dev->name, ethertype);
			goto rx_dropped;
		}
	}
#endif

	/* convert hdr + possible LLC headers into Ethernet header */
	if (skb->len - hdrlen >= 8 &&
	    ((memcmp(payload, rfc1042_header, SNAP_SIZE) == 0 &&
	      ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
	     memcmp(payload, bridge_tunnel_header, SNAP_SIZE) == 0)) {
		/* remove RFC1042 or Bridge-Tunnel encapsulation and
		 * replace EtherType */
		skb_pull(skb, hdrlen + SNAP_SIZE);
		memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
		memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
	} else {
		u16 len;
		/* Leave Ethernet header part of hdr and full payload */
		skb_pull(skb, hdrlen);
		len = htons(skb->len);
		memcpy(skb_push(skb, 2), &len, 2);
		memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
		memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
	}

#ifdef NOT_YET
	if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
		    IEEE80211_FCTL_TODS) && skb->len >= ETH_HLEN + ETH_ALEN) {
		/* Non-standard frame: get addr4 from its bogus location after
		 * the payload */
		memcpy(skb->data + ETH_ALEN,
		       skb->data + skb->len - ETH_ALEN, ETH_ALEN);
		skb_trim(skb, skb->len - ETH_ALEN);
	}
#endif

	stats->rx_packets++;
	stats->rx_bytes += skb->len;

#ifdef NOT_YET
	if (ieee->iw_mode == IW_MODE_MASTER && !wds && ieee->ap->bridge_packets) {
		if (dst[0] & 0x01) {
			/* copy multicast frame both to the higher layers and
			 * to the wireless media */
			ieee->ap->bridged_multicast++;
			skb2 = skb_clone(skb, GFP_ATOMIC);
			if (skb2 == NULL)
				printk(KERN_DEBUG "%s: skb_clone failed for "
				       "multicast frame\n", dev->name);
		} else if (hostap_is_sta_assoc(ieee->ap, dst)) {
			/* send frame directly to the associated STA using
			 * wireless media and not passing to higher layers */
			ieee->ap->bridged_unicast++;
			skb2 = skb;
			skb = NULL;
		}
	}

	if (skb2 != NULL) {
		/* send to wireless media */
		skb2->protocol = __constant_htons(ETH_P_802_3);
		skb2->mac.raw = skb2->nh.raw = skb2->data;
		/* skb2->nh.raw = skb2->data + ETH_HLEN; */
		skb2->dev = dev;
		dev_queue_xmit(skb2);
	}
#endif

	if (skb) {
		skb->protocol = eth_type_trans(skb, dev);
		memset(skb->cb, 0, sizeof(skb->cb));
		skb->dev = dev;
		skb->ip_summed = CHECKSUM_NONE;	/* 802.11 crc not sufficient */
		netif_rx(skb);
	}

      rx_exit:
#ifdef NOT_YET
	if (sta)
		hostap_handle_sta_release(sta);
#endif
	return 1;

      rx_dropped:
	stats->rx_dropped++;

	/* Returning 0 indicates to caller that we have not handled the SKB--
	 * so it is still allocated and can be used again by underlying
	 * hardware as a DMA target */
	return 0;
}

#define MGMT_FRAME_FIXED_PART_LENGTH		0x24

static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };

/*
* Make ther structure we read from the beacon packet has
* the right values
*/
static int ieee80211_verify_qos_info(struct ieee80211_qos_information_element
				     *info_element, int sub_type)
{

	if (info_element->qui_subtype != sub_type)
		return -1;
	if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
		return -1;
	if (info_element->qui_type != QOS_OUI_TYPE)
		return -1;
	if (info_element->version != QOS_VERSION_1)
		return -1;

	return 0;
}

/*
 * Parse a QoS parameter element
 */
static int ieee80211_read_qos_param_element(struct ieee80211_qos_parameter_info
					    *element_param, struct ieee80211_info_element
					    *info_element)
{
	int ret = 0;
	u16 size = sizeof(struct ieee80211_qos_parameter_info) - 2;

	if ((info_element == NULL) || (element_param == NULL))
		return -1;

	if (info_element->id == QOS_ELEMENT_ID && info_element->len == size) {
		memcpy(element_param->info_element.qui, info_element->data,
		       info_element->len);
		element_param->info_element.elementID = info_element->id;
		element_param->info_element.length = info_element->len;
	} else
		ret = -1;
	if (ret == 0)
		ret = ieee80211_verify_qos_info(&element_param->info_element,
						QOS_OUI_PARAM_SUB_TYPE);
	return ret;
}

/*
 * Parse a QoS information element
 */
static int ieee80211_read_qos_info_element(struct
					   ieee80211_qos_information_element
					   *element_info, struct ieee80211_info_element
					   *info_element)
{
	int ret = 0;
	u16 size = sizeof(struct ieee80211_qos_information_element) - 2;

	if (element_info == NULL)
		return -1;
	if (info_element == NULL)
		return -1;

	if ((info_element->id == QOS_ELEMENT_ID) && (info_element->len == size)) {
		memcpy(element_info->qui, info_element->data,
		       info_element->len);
		element_info->elementID = info_element->id;
		element_info->length = info_element->len;
	} else
		ret = -1;

	if (ret == 0)
		ret = ieee80211_verify_qos_info(element_info,
						QOS_OUI_INFO_SUB_TYPE);
	return ret;
}

/*
 * Write QoS parameters from the ac parameters.
 */
static int ieee80211_qos_convert_ac_to_parameters(struct
						  ieee80211_qos_parameter_info
						  *param_elm, struct
						  ieee80211_qos_parameters
						  *qos_param)
{
	int rc = 0;
	int i;
	struct ieee80211_qos_ac_parameter *ac_params;
	u32 txop;
	u8 cw_min;
	u8 cw_max;

	for (i = 0; i < QOS_QUEUE_NUM; i++) {
		ac_params = &(param_elm->ac_params_record[i]);

		qos_param->aifs[i] = (ac_params->aci_aifsn) & 0x0F;
		qos_param->aifs[i] -= (qos_param->aifs[i] < 2) ? 0 : 2;

		cw_min = ac_params->ecw_min_max & 0x0F;
		qos_param->cw_min[i] = (u16) ((1 << cw_min) - 1);

		cw_max = (ac_params->ecw_min_max & 0xF0) >> 4;
		qos_param->cw_max[i] = (u16) ((1 << cw_max) - 1);

		qos_param->flag[i] =
		    (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;

		txop = le16_to_cpu(ac_params->tx_op_limit) * 32;
		qos_param->tx_op_limit[i] = (u16) txop;
	}
	return rc;
}

/*
 * we have a generic data element which it may contain QoS information or
 * parameters element. check the information element length to decide
 * which type to read
 */
static int ieee80211_parse_qos_info_param_IE(struct ieee80211_info_element
					     *info_element,
					     struct ieee80211_network *network)
{
	int rc = 0;
	struct ieee80211_qos_parameters *qos_param = NULL;
	struct ieee80211_qos_information_element qos_info_element;

	rc = ieee80211_read_qos_info_element(&qos_info_element, info_element);

	if (rc == 0) {
		network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
		network->flags |= NETWORK_HAS_QOS_INFORMATION;
	} else {
		struct ieee80211_qos_parameter_info param_element;

		rc = ieee80211_read_qos_param_element(&param_element,
						      info_element);
		if (rc == 0) {
			qos_param = &(network->qos_data.parameters);
			ieee80211_qos_convert_ac_to_parameters(&param_element,
							       qos_param);
			network->flags |= NETWORK_HAS_QOS_PARAMETERS;
			network->qos_data.param_count =
			    param_element.info_element.ac_info & 0x0F;
		}
	}

	if (rc == 0) {
		IEEE80211_DEBUG_QOS("QoS is supported\n");
		network->qos_data.supported = 1;
	}
	return rc;
}

static int ieee80211_handle_assoc_resp(struct ieee80211_device *ieee, struct ieee80211_assoc_response
				       *frame, struct ieee80211_rx_stats *stats)
{
	struct ieee80211_network network_resp;
	struct ieee80211_network *network = &network_resp;
	struct ieee80211_info_element *info_element;
	struct net_device *dev = ieee->dev;
	u16 left;

	network->flags = 0;
	network->qos_data.active = 0;
	network->qos_data.supported = 0;
	network->qos_data.param_count = 0;
	network->qos_data.old_param_count = 0;

	//network->atim_window = le16_to_cpu(frame->aid) & (0x3FFF);
	network->atim_window = le16_to_cpu(frame->aid);
	network->listen_interval = le16_to_cpu(frame->status);

	info_element = frame->info_element;
	left = stats->len - sizeof(*frame);

	while (left >= sizeof(struct ieee80211_info_element)) {
		if (sizeof(struct ieee80211_info_element) +
		    info_element->len > left) {
			IEEE80211_DEBUG_QOS("ASSOC RESP: parse failed: "
					    "info_element->len + 2 > left : "
					    "info_element->len+2=%zd left=%d, id=%d.\n",
					    info_element->len +
					    sizeof(struct
						   ieee80211_info_element),
					    left, info_element->id);
			return 1;
		}

		switch (info_element->id) {
		case MFIE_TYPE_SSID:
			if (ieee80211_is_empty_essid(info_element->data,
						     info_element->len)) {
				network->flags |= NETWORK_EMPTY_ESSID;
				break;
			}

			network->ssid_len = min(info_element->len,
						(u8) IW_ESSID_MAX_SIZE);
			memcpy(network->ssid, info_element->data,
			       network->ssid_len);
			if (network->ssid_len < IW_ESSID_MAX_SIZE)
				memset(network->ssid + network->ssid_len, 0,
				       IW_ESSID_MAX_SIZE - network->ssid_len);

			IEEE80211_DEBUG_QOS("MFIE_TYPE_SSID: '%s' len=%d.\n",
					    network->ssid, network->ssid_len);
			break;

		case MFIE_TYPE_TIM:
			IEEE80211_DEBUG_QOS("MFIE_TYPE_TIM: ignored\n");
			break;

		case MFIE_TYPE_IBSS_SET:
			IEEE80211_DEBUG_QOS("MFIE_TYPE_IBSS_SET: ignored\n");
			break;

		case MFIE_TYPE_CHALLENGE:
			IEEE80211_DEBUG_QOS("MFIE_TYPE_CHALLENGE: ignored\n");
			break;

		case MFIE_TYPE_GENERIC:
			IEEE80211_DEBUG_QOS("MFIE_TYPE_GENERIC: %d bytes\n",
					    info_element->len);
			ieee80211_parse_qos_info_param_IE(info_element,
							  network);
			break;

		case MFIE_TYPE_RSN:
			IEEE80211_DEBUG_QOS("MFIE_TYPE_RSN: %d bytes\n",
					    info_element->len);
			break;

		case MFIE_TYPE_QOS_PARAMETER:
			printk("QoS Error need to parse QOS_PARAMETER IE\n");
			break;

		default:
			IEEE80211_DEBUG_QOS("unsupported IE %d\n",
					    info_element->id);
			break;
		}

		left -= sizeof(struct ieee80211_info_element) +
		    info_element->len;
		info_element = (struct ieee80211_info_element *)
		    &info_element->data[info_element->len];
	}

	if (ieee->handle_assoc_response != NULL)
		ieee->handle_assoc_response(dev, frame, network);

	return 0;
}

/***************************************************/

static inline int ieee80211_network_init(struct ieee80211_device *ieee, struct ieee80211_probe_response
					 *beacon,
					 struct ieee80211_network *network,
					 struct ieee80211_rx_stats *stats)
{
#ifdef CONFIG_IEEE80211_DEBUG
	char rates_str[64];
	char *p;
#endif
	struct ieee80211_info_element *info_element;
	u16 left;
	u8 i;
	network->qos_data.active = 0;
	network->qos_data.supported = 0;
	network->qos_data.param_count = 0;

	/* Pull out fixed field data */
	memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);
	network->capability = le16_to_cpu(beacon->capability);
	network->last_scanned = jiffies;
	network->time_stamp[0] = le32_to_cpu(beacon->time_stamp[0]);
	network->time_stamp[1] = le32_to_cpu(beacon->time_stamp[1]);
	network->beacon_interval = le16_to_cpu(beacon->beacon_interval);
	/* Where to pull this? beacon->listen_interval; */
	network->listen_interval = 0x0A;
	network->rates_len = network->rates_ex_len = 0;
	network->last_associate = 0;
	network->ssid_len = 0;
	network->flags = 0;
	network->atim_window = 0;
	network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?
	    0x3 : 0x0;

	if (stats->freq == IEEE80211_52GHZ_BAND) {
		/* for A band (No DS info) */
		network->channel = stats->received_channel;
	} else
		network->flags |= NETWORK_HAS_CCK;

	network->wpa_ie_len = 0;
	network->rsn_ie_len = 0;

	info_element = beacon->info_element;
	left = stats->len - sizeof(*beacon);
	while (left >= sizeof(*info_element)) {
		if (sizeof(*info_element) + info_element->len > left) {
			IEEE80211_DEBUG_SCAN
			    ("SCAN: parse failed: info_element->len + 2 > left : info_element->len+2=%Zd left=%d.\n",
			     info_element->len + sizeof(*info_element), left);
			return 1;
		}

		switch (info_element->id) {
		case MFIE_TYPE_SSID:
			if (ieee80211_is_empty_essid(info_element->data,
						     info_element->len)) {
				network->flags |= NETWORK_EMPTY_ESSID;
				break;
			}

			network->ssid_len = min(info_element->len,
						(u8) IW_ESSID_MAX_SIZE);
			memcpy(network->ssid, info_element->data,
			       network->ssid_len);
			if (network->ssid_len < IW_ESSID_MAX_SIZE)
				memset(network->ssid + network->ssid_len, 0,
				       IW_ESSID_MAX_SIZE - network->ssid_len);

			IEEE80211_DEBUG_SCAN("MFIE_TYPE_SSID: '%s' len=%d.\n",
					     network->ssid, network->ssid_len);
			break;

		case MFIE_TYPE_RATES:
#ifdef CONFIG_IEEE80211_DEBUG
			p = rates_str;
#endif
			network->rates_len = min(info_element->len,
						 MAX_RATES_LENGTH);
			for (i = 0; i < network->rates_len; i++) {
				network->rates[i] = info_element->data[i];
#ifdef CONFIG_IEEE80211_DEBUG
				p += snprintf(p, sizeof(rates_str) -
					      (p - rates_str), "%02X ",
					      network->rates[i]);
#endif
				if (ieee80211_is_ofdm_rate
				    (info_element->data[i])) {
					network->flags |= NETWORK_HAS_OFDM;
					if (info_element->data[i] &
					    IEEE80211_BASIC_RATE_MASK)
						network->flags &=
						    ~NETWORK_HAS_CCK;
				}
			}

			IEEE80211_DEBUG_SCAN("MFIE_TYPE_RATES: '%s' (%d)\n",
					     rates_str, network->rates_len);
			break;

		case MFIE_TYPE_RATES_EX:
#ifdef CONFIG_IEEE80211_DEBUG
			p = rates_str;
#endif
			network->rates_ex_len = min(info_element->len,
						    MAX_RATES_EX_LENGTH);
			for (i = 0; i < network->rates_ex_len; i++) {
				network->rates_ex[i] = info_element->data[i];
#ifdef CONFIG_IEEE80211_DEBUG
				p += snprintf(p, sizeof(rates_str) -
					      (p - rates_str), "%02X ",
					      network->rates[i]);
#endif
				if (ieee80211_is_ofdm_rate
				    (info_element->data[i])) {
					network->flags |= NETWORK_HAS_OFDM;
					if (info_element->data[i] &
					    IEEE80211_BASIC_RATE_MASK)
						network->flags &=
						    ~NETWORK_HAS_CCK;
				}
			}

			IEEE80211_DEBUG_SCAN("MFIE_TYPE_RATES_EX: '%s' (%d)\n",
					     rates_str, network->rates_ex_len);
			break;

		case MFIE_TYPE_DS_SET:
			IEEE80211_DEBUG_SCAN("MFIE_TYPE_DS_SET: %d\n",
					     info_element->data[0]);
			if (stats->freq == IEEE80211_24GHZ_BAND)
				network->channel = info_element->data[0];
			break;

		case MFIE_TYPE_FH_SET:
			IEEE80211_DEBUG_SCAN("MFIE_TYPE_FH_SET: ignored\n");
			break;

		case MFIE_TYPE_CF_SET:
			IEEE80211_DEBUG_SCAN("MFIE_TYPE_CF_SET: ignored\n");
			break;

		case MFIE_TYPE_TIM:
			IEEE80211_DEBUG_SCAN("MFIE_TYPE_TIM: ignored\n");
			break;

		case MFIE_TYPE_ERP_INFO:
			network->erp_value = info_element->data[0];
			IEEE80211_DEBUG_SCAN("MFIE_TYPE_ERP_SET: %d\n",
					     network->erp_value);
			break;

		case MFIE_TYPE_IBSS_SET:
			network->atim_window = info_element->data[0];
			IEEE80211_DEBUG_SCAN("MFIE_TYPE_IBSS_SET: %d\n",
					     network->atim_window);
			break;

		case MFIE_TYPE_CHALLENGE:
			IEEE80211_DEBUG_SCAN("MFIE_TYPE_CHALLENGE: ignored\n");
			break;

		case MFIE_TYPE_GENERIC:
			IEEE80211_DEBUG_SCAN("MFIE_TYPE_GENERIC: %d bytes\n",
					     info_element->len);
			if (!ieee80211_parse_qos_info_param_IE(info_element,
							       network))
				break;

			if (info_element->len >= 4 &&
			    info_element->data[0] == 0x00 &&
			    info_element->data[1] == 0x50 &&
			    info_element->data[2] == 0xf2 &&
			    info_element->data[3] == 0x01) {
				network->wpa_ie_len = min(info_element->len + 2,
							  MAX_WPA_IE_LEN);
				memcpy(network->wpa_ie, info_element,
				       network->wpa_ie_len);
			}
			break;

		case MFIE_TYPE_RSN:
			IEEE80211_DEBUG_SCAN("MFIE_TYPE_RSN: %d bytes\n",
					     info_element->len);
			network->rsn_ie_len = min(info_element->len + 2,
						  MAX_WPA_IE_LEN);
			memcpy(network->rsn_ie, info_element,
			       network->rsn_ie_len);
			break;

		case MFIE_TYPE_QOS_PARAMETER:
			printk(KERN_ERR
			       "QoS Error need to parse QOS_PARAMETER IE\n");
			break;

		default:
			IEEE80211_DEBUG_SCAN("unsupported IE %d\n",
					     info_element->id);
			break;
		}

		left -= sizeof(*info_element) + info_element->len;
		info_element = (struct ieee80211_info_element *)
		    &info_element->data[info_element->len];
	}

	network->mode = 0;
	if (stats->freq == IEEE80211_52GHZ_BAND)
		network->mode = IEEE_A;
	else {
		if (network->flags & NETWORK_HAS_OFDM)
			network->mode |= IEEE_G;
		if (network->flags & NETWORK_HAS_CCK)
			network->mode |= IEEE_B;
	}

	if (network->mode == 0) {
		IEEE80211_DEBUG_SCAN("Filtered out '%s (" MAC_FMT ")' "
				     "network.\n",
				     escape_essid(network->ssid,
						  network->ssid_len),
				     MAC_ARG(network->bssid));
		return 1;
	}

	if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
		network->flags |= NETWORK_EMPTY_ESSID;

	memcpy(&network->stats, stats, sizeof(network->stats));

	return 0;
}

static inline int is_same_network(struct ieee80211_network *src,
				  struct ieee80211_network *dst)
{
	/* A network is only a duplicate if the channel, BSSID, and ESSID
	 * all match.  We treat all <hidden> with the same BSSID and channel
	 * as one network */
	return ((src->ssid_len == dst->ssid_len) &&
		(src->channel == dst->channel) &&
		!memcmp(src->bssid, dst->bssid, ETH_ALEN) &&
		!memcmp(src->ssid, dst->ssid, src->ssid_len));
}

static inline void update_network(struct ieee80211_network *dst,
				  struct ieee80211_network *src)
{
	int qos_active;
	u8 old_param;

	memcpy(&dst->stats, &src->stats, sizeof(struct ieee80211_rx_stats));
	dst->capability = src->capability;
	memcpy(dst->rates, src->rates, src->rates_len);
	dst->rates_len = src->rates_len;
	memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
	dst->rates_ex_len = src->rates_ex_len;

	dst->mode = src->mode;
	dst->flags = src->flags;
	dst->time_stamp[0] = src->time_stamp[0];
	dst->time_stamp[1] = src->time_stamp[1];

	dst->beacon_interval = src->beacon_interval;
	dst->listen_interval = src->listen_interval;
	dst->atim_window = src->atim_window;
	dst->erp_value = src->erp_value;

	memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
	dst->wpa_ie_len = src->wpa_ie_len;
	memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
	dst->rsn_ie_len = src->rsn_ie_len;

	dst->last_scanned = jiffies;
	qos_active = src->qos_data.active;
	old_param = dst->qos_data.old_param_count;
	if (dst->flags & NETWORK_HAS_QOS_MASK)
		memcpy(&dst->qos_data, &src->qos_data,
		       sizeof(struct ieee80211_qos_data));
	else {
		dst->qos_data.supported = src->qos_data.supported;
		dst->qos_data.param_count = src->qos_data.param_count;
	}

	if (dst->qos_data.supported == 1) {
		if (dst->ssid_len)
			IEEE80211_DEBUG_QOS
			    ("QoS the network %s is QoS supported\n",
			     dst->ssid);
		else
			IEEE80211_DEBUG_QOS
			    ("QoS the network is QoS supported\n");
	}
	dst->qos_data.active = qos_active;
	dst->qos_data.old_param_count = old_param;

	/* dst->last_associate is not overwritten */
}

static inline int is_beacon(int fc)
{
	return (WLAN_FC_GET_STYPE(le16_to_cpu(fc)) == IEEE80211_STYPE_BEACON);
}

static inline void ieee80211_process_probe_response(struct ieee80211_device
						    *ieee, struct
						    ieee80211_probe_response
						    *beacon, struct ieee80211_rx_stats
						    *stats)
{
	struct net_device *dev = ieee->dev;
	struct ieee80211_network network;
	struct ieee80211_network *target;
	struct ieee80211_network *oldest = NULL;
#ifdef CONFIG_IEEE80211_DEBUG
	struct ieee80211_info_element *info_element = beacon->info_element;
#endif
	unsigned long flags;

	IEEE80211_DEBUG_SCAN("'%s' (" MAC_FMT
			     "): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
			     escape_essid(info_element->data,
					  info_element->len),
			     MAC_ARG(beacon->header.addr3),
			     (beacon->capability & (1 << 0xf)) ? '1' : '0',
			     (beacon->capability & (1 << 0xe)) ? '1' : '0',
			     (beacon->capability & (1 << 0xd)) ? '1' : '0',
			     (beacon->capability & (1 << 0xc)) ? '1' : '0',
			     (beacon->capability & (1 << 0xb)) ? '1' : '0',
			     (beacon->capability & (1 << 0xa)) ? '1' : '0',
			     (beacon->capability & (1 << 0x9)) ? '1' : '0',
			     (beacon->capability & (1 << 0x8)) ? '1' : '0',
			     (beacon->capability & (1 << 0x7)) ? '1' : '0',
			     (beacon->capability & (1 << 0x6)) ? '1' : '0',
			     (beacon->capability & (1 << 0x5)) ? '1' : '0',
			     (beacon->capability & (1 << 0x4)) ? '1' : '0',
			     (beacon->capability & (1 << 0x3)) ? '1' : '0',
			     (beacon->capability & (1 << 0x2)) ? '1' : '0',
			     (beacon->capability & (1 << 0x1)) ? '1' : '0',
			     (beacon->capability & (1 << 0x0)) ? '1' : '0');

	if (ieee80211_network_init(ieee, beacon, &network, stats)) {
		IEEE80211_DEBUG_SCAN("Dropped '%s' (" MAC_FMT ") via %s.\n",
				     escape_essid(info_element->data,
						  info_element->len),
				     MAC_ARG(beacon->header.addr3),
				     is_beacon(le16_to_cpu
					       (beacon->header.
						frame_ctl)) ?
				     "BEACON" : "PROBE RESPONSE");
		return;
	}

	/* The network parsed correctly -- so now we scan our known networks
	 * to see if we can find it in our list.
	 *
	 * NOTE:  This search is definitely not optimized.  Once its doing
	 *        the "right thing" we'll optimize it for efficiency if
	 *        necessary */

	/* Search for this entry in the list and update it if it is
	 * already there. */

	spin_lock_irqsave(&ieee->lock, flags);

	list_for_each_entry(target, &ieee->network_list, list) {
		if (is_same_network(target, &network))
			break;

		if ((oldest == NULL) ||
		    (target->last_scanned < oldest->last_scanned))
			oldest = target;
	}

	/* If we didn't find a match, then get a new network slot to initialize
	 * with this beacon's information */
	if (&target->list == &ieee->network_list) {
		if (list_empty(&ieee->network_free_list)) {
			/* If there are no more slots, expire the oldest */
			list_del(&oldest->list);
			target = oldest;
			IEEE80211_DEBUG_SCAN("Expired '%s' (" MAC_FMT ") from "
					     "network list.\n",
					     escape_essid(target->ssid,
							  target->ssid_len),
					     MAC_ARG(target->bssid));
		} else {
			/* Otherwise just pull from the free list */
			target = list_entry(ieee->network_free_list.next,
					    struct ieee80211_network, list);
			list_del(ieee->network_free_list.next);
		}

#ifdef CONFIG_IEEE80211_DEBUG
		IEEE80211_DEBUG_SCAN("Adding '%s' (" MAC_FMT ") via %s.\n",
				     escape_essid(network.ssid,
						  network.ssid_len),
				     MAC_ARG(network.bssid),
				     is_beacon(le16_to_cpu
					       (beacon->header.
						frame_ctl)) ?
				     "BEACON" : "PROBE RESPONSE");
#endif
		memcpy(target, &network, sizeof(*target));
		list_add_tail(&target->list, &ieee->network_list);
	} else {
		IEEE80211_DEBUG_SCAN("Updating '%s' (" MAC_FMT ") via %s.\n",
				     escape_essid(target->ssid,
						  target->ssid_len),
				     MAC_ARG(target->bssid),
				     is_beacon(le16_to_cpu
					       (beacon->header.
						frame_ctl)) ?
				     "BEACON" : "PROBE RESPONSE");
		update_network(target, &network);
	}

	spin_unlock_irqrestore(&ieee->lock, flags);

	if (is_beacon(le16_to_cpu(beacon->header.frame_ctl))) {
		if (ieee->handle_beacon != NULL)
			ieee->handle_beacon(dev, beacon, &network);
	} else {
		if (ieee->handle_probe_response != NULL)
			ieee->handle_probe_response(dev, beacon, &network);
	}
}

void ieee80211_rx_mgt(struct ieee80211_device *ieee,
		      struct ieee80211_hdr_4addr *header,
		      struct ieee80211_rx_stats *stats)
{
	switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) {
	case IEEE80211_STYPE_ASSOC_RESP:
		IEEE80211_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n",
				     WLAN_FC_GET_STYPE(le16_to_cpu
						       (header->frame_ctl)));
		ieee80211_handle_assoc_resp(ieee,
					    (struct ieee80211_assoc_response *)
					    header, stats);
		break;

	case IEEE80211_STYPE_REASSOC_RESP:
		IEEE80211_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n",
				     WLAN_FC_GET_STYPE(le16_to_cpu
						       (header->frame_ctl)));
		break;

	case IEEE80211_STYPE_PROBE_REQ:
		IEEE80211_DEBUG_MGMT("recieved auth (%d)\n",
				     WLAN_FC_GET_STYPE(le16_to_cpu
						       (header->frame_ctl)));

		if (ieee->handle_probe_request != NULL)
			ieee->handle_probe_request(ieee->dev,
						   (struct
						    ieee80211_probe_request *)
						   header, stats);
		break;

	case IEEE80211_STYPE_PROBE_RESP:
		IEEE80211_DEBUG_MGMT("received PROBE RESPONSE (%d)\n",
				     WLAN_FC_GET_STYPE(le16_to_cpu
						       (header->frame_ctl)));
		IEEE80211_DEBUG_SCAN("Probe response\n");
		ieee80211_process_probe_response(ieee,
						 (struct
						  ieee80211_probe_response *)
						 header, stats);
		break;

	case IEEE80211_STYPE_BEACON:
		IEEE80211_DEBUG_MGMT("received BEACON (%d)\n",
				     WLAN_FC_GET_STYPE(le16_to_cpu
						       (header->frame_ctl)));
		IEEE80211_DEBUG_SCAN("Beacon\n");
		ieee80211_process_probe_response(ieee,
						 (struct
						  ieee80211_probe_response *)
						 header, stats);
		break;
	case IEEE80211_STYPE_AUTH:

		IEEE80211_DEBUG_MGMT("recieved auth (%d)\n",
				     WLAN_FC_GET_STYPE(le16_to_cpu
						       (header->frame_ctl)));

		if (ieee->handle_auth != NULL)
			ieee->handle_auth(ieee->dev,
					  (struct ieee80211_auth *)header);
		break;

	case IEEE80211_STYPE_DISASSOC:
		if (ieee->handle_disassoc != NULL)
			ieee->handle_disassoc(ieee->dev,
					      (struct ieee80211_disassoc *)
					      header);
		break;

	case IEEE80211_STYPE_DEAUTH:
		printk("DEAUTH from AP\n");
		if (ieee->handle_deauth != NULL)
			ieee->handle_deauth(ieee->dev, (struct ieee80211_auth *)
					    header);
		break;
	default:
		IEEE80211_DEBUG_MGMT("received UNKNOWN (%d)\n",
				     WLAN_FC_GET_STYPE(le16_to_cpu
						       (header->frame_ctl)));
		IEEE80211_WARNING("%s: Unknown management packet: %d\n",
				  ieee->dev->name,
				  WLAN_FC_GET_STYPE(le16_to_cpu
						    (header->frame_ctl)));
		break;
	}
}

EXPORT_SYMBOL(ieee80211_rx_mgt);
EXPORT_SYMBOL(ieee80211_rx);