aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/wireless/bcm43xx/bcm43xx_xmit.c
blob: a957bc8613820c16a935c9c816cd8f1b1d9a38aa (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
/*

  Broadcom BCM43xx wireless driver

  Transmission (TX/RX) related functions.

  Copyright (c) 2005 Martin Langer <martin-langer@gmx.de>,
                     Stefano Brivio <st3@riseup.net>
                     Michael Buesch <mbuesch@freenet.de>
                     Danny van Dyk <kugelfang@gentoo.org>
                     Andreas Jaggi <andreas.jaggi@waterwave.ch>

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; see the file COPYING.  If not, write to
  the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
  Boston, MA 02110-1301, USA.

*/

#include "bcm43xx_xmit.h"

#include <linux/etherdevice.h>


/* Extract the bitrate out of a CCK PLCP header. */
static u8 bcm43xx_plcp_get_bitrate_cck(struct bcm43xx_plcp_hdr4 *plcp)
{
	switch (plcp->raw[0]) {
	case 0x0A:
		return IEEE80211_CCK_RATE_1MB;
	case 0x14:
		return IEEE80211_CCK_RATE_2MB;
	case 0x37:
		return IEEE80211_CCK_RATE_5MB;
	case 0x6E:
		return IEEE80211_CCK_RATE_11MB;
	}
	assert(0);
	return 0;
}

/* Extract the bitrate out of an OFDM PLCP header. */
static u8 bcm43xx_plcp_get_bitrate_ofdm(struct bcm43xx_plcp_hdr4 *plcp)
{
	switch (plcp->raw[0] & 0xF) {
	case 0xB:
		return IEEE80211_OFDM_RATE_6MB;
	case 0xF:
		return IEEE80211_OFDM_RATE_9MB;
	case 0xA:
		return IEEE80211_OFDM_RATE_12MB;
	case 0xE:
		return IEEE80211_OFDM_RATE_18MB;
	case 0x9:
		return IEEE80211_OFDM_RATE_24MB;
	case 0xD:
		return IEEE80211_OFDM_RATE_36MB;
	case 0x8:
		return IEEE80211_OFDM_RATE_48MB;
	case 0xC:
		return IEEE80211_OFDM_RATE_54MB;
	}
	assert(0);
	return 0;
}

u8 bcm43xx_plcp_get_ratecode_cck(const u8 bitrate)
{
	switch (bitrate) {
	case IEEE80211_CCK_RATE_1MB:
		return 0x0A;
	case IEEE80211_CCK_RATE_2MB:
		return 0x14;
	case IEEE80211_CCK_RATE_5MB:
		return 0x37;
	case IEEE80211_CCK_RATE_11MB:
		return 0x6E;
	}
	assert(0);
	return 0;
}

u8 bcm43xx_plcp_get_ratecode_ofdm(const u8 bitrate)
{
	switch (bitrate) {
	case IEEE80211_OFDM_RATE_6MB:
		return 0xB;
	case IEEE80211_OFDM_RATE_9MB:
		return 0xF;
	case IEEE80211_OFDM_RATE_12MB:
		return 0xA;
	case IEEE80211_OFDM_RATE_18MB:
		return 0xE;
	case IEEE80211_OFDM_RATE_24MB:
		return 0x9;
	case IEEE80211_OFDM_RATE_36MB:
		return 0xD;
	case IEEE80211_OFDM_RATE_48MB:
		return 0x8;
	case IEEE80211_OFDM_RATE_54MB:
		return 0xC;
	}
	assert(0);
	return 0;
}

static void bcm43xx_generate_plcp_hdr(struct bcm43xx_plcp_hdr4 *plcp,
				      const u16 octets, const u8 bitrate,
				      const int ofdm_modulation)
{
	__le32 *data = &(plcp->data);
	__u8 *raw = plcp->raw;

	if (ofdm_modulation) {
		*data = bcm43xx_plcp_get_ratecode_ofdm(bitrate);
		assert(!(octets & 0xF000));
		*data |= (octets << 5);
		*data = cpu_to_le32(*data);
	} else {
		u32 plen;

		plen = octets * 16 / bitrate;
		if ((octets * 16 % bitrate) > 0) {
			plen++;
			if ((bitrate == IEEE80211_CCK_RATE_11MB)
			    && ((octets * 8 % 11) < 4)) {
				raw[1] = 0x84;
			} else
				raw[1] = 0x04;
		} else
			raw[1] = 0x04;
		*data |= cpu_to_le32(plen << 16);
		raw[0] = bcm43xx_plcp_get_ratecode_cck(bitrate);
	}
}

static u8 bcm43xx_calc_fallback_rate(u8 bitrate)
{
	switch (bitrate) {
	case IEEE80211_CCK_RATE_1MB:
		return IEEE80211_CCK_RATE_1MB;
	case IEEE80211_CCK_RATE_2MB:
		return IEEE80211_CCK_RATE_1MB;
	case IEEE80211_CCK_RATE_5MB:
		return IEEE80211_CCK_RATE_2MB;
	case IEEE80211_CCK_RATE_11MB:
		return IEEE80211_CCK_RATE_5MB;
	case IEEE80211_OFDM_RATE_6MB:
		return IEEE80211_CCK_RATE_5MB;
	case IEEE80211_OFDM_RATE_9MB:
		return IEEE80211_OFDM_RATE_6MB;
	case IEEE80211_OFDM_RATE_12MB:
		return IEEE80211_OFDM_RATE_9MB;
	case IEEE80211_OFDM_RATE_18MB:
		return IEEE80211_OFDM_RATE_12MB;
	case IEEE80211_OFDM_RATE_24MB:
		return IEEE80211_OFDM_RATE_18MB;
	case IEEE80211_OFDM_RATE_36MB:
		return IEEE80211_OFDM_RATE_24MB;
	case IEEE80211_OFDM_RATE_48MB:
		return IEEE80211_OFDM_RATE_36MB;
	case IEEE80211_OFDM_RATE_54MB:
		return IEEE80211_OFDM_RATE_48MB;
	}
	assert(0);
	return 0;
}

static
__le16 bcm43xx_calc_duration_id(const struct ieee80211_hdr *wireless_header,
				u8 bitrate)
{
	const u16 frame_ctl = le16_to_cpu(wireless_header->frame_ctl);
	__le16 duration_id = wireless_header->duration_id;

	switch (WLAN_FC_GET_TYPE(frame_ctl)) {
	case IEEE80211_FTYPE_DATA:
	case IEEE80211_FTYPE_MGMT:
		//TODO: Steal the code from ieee80211, once it is completed there.
		break;
	case IEEE80211_FTYPE_CTL:
		/* Use the original duration/id. */
		break;
	default:
		assert(0);
	}

	return duration_id;
}

static inline
u16 ceiling_div(u16 dividend, u16 divisor)
{
	return ((dividend + divisor - 1) / divisor);
}

static void bcm43xx_generate_rts(const struct bcm43xx_phyinfo *phy,
				 struct bcm43xx_txhdr *txhdr,
				 u16 *flags,
				 u8 bitrate,
				 const struct ieee80211_hdr_4addr *wlhdr)
{
	u16 fctl;
	u16 dur;
	u8 fallback_bitrate;
	int ofdm_modulation;
	int fallback_ofdm_modulation;
//	u8 *sa, *da;
	u16 flen;

//FIXME	sa = ieee80211_get_SA((struct ieee80211_hdr *)wlhdr);
//FIXME	da = ieee80211_get_DA((struct ieee80211_hdr *)wlhdr);
	fallback_bitrate = bcm43xx_calc_fallback_rate(bitrate);
	ofdm_modulation = !(ieee80211_is_cck_rate(bitrate));
	fallback_ofdm_modulation = !(ieee80211_is_cck_rate(fallback_bitrate));

	flen = sizeof(u16) + sizeof(u16) + ETH_ALEN + ETH_ALEN + IEEE80211_FCS_LEN,
	bcm43xx_generate_plcp_hdr((struct bcm43xx_plcp_hdr4 *)(&txhdr->rts_cts_plcp),
				  flen, bitrate,
				  !ieee80211_is_cck_rate(bitrate));
	bcm43xx_generate_plcp_hdr((struct bcm43xx_plcp_hdr4 *)(&txhdr->rts_cts_fallback_plcp),
				  flen, fallback_bitrate,
				  !ieee80211_is_cck_rate(fallback_bitrate));
	fctl = IEEE80211_FTYPE_CTL;
	fctl |= IEEE80211_STYPE_RTS;
	dur = le16_to_cpu(wlhdr->duration_id);
/*FIXME: should we test for dur==0 here and let it unmodified in this case?
 *       The following assert checks for this case...
 */
assert(dur);
/*FIXME: The duration calculation is not really correct.
 *       I am not 100% sure which bitrate to use. We use the RTS rate here,
 *       but this is likely to be wrong.
 */
	if (phy->type == BCM43xx_PHYTYPE_A) {
		/* Three times SIFS */
		dur += 16 * 3;
		/* Add ACK duration. */
		dur += ceiling_div((16 + 8 * (14 /*bytes*/) + 6) * 10,
				   bitrate * 4);
		/* Add CTS duration. */
		dur += ceiling_div((16 + 8 * (14 /*bytes*/) + 6) * 10,
				   bitrate * 4);
	} else {
		/* Three times SIFS */
		dur += 10 * 3;
		/* Add ACK duration. */
		dur += ceiling_div(8 * (14 /*bytes*/) * 10,
				   bitrate);
		/* Add CTS duration. */
		dur += ceiling_div(8 * (14 /*bytes*/) * 10,
				   bitrate);
	}

	txhdr->rts_cts_frame_control = cpu_to_le16(fctl);
	txhdr->rts_cts_dur = cpu_to_le16(dur);
//printk(BCM43xx_MACFMT "  " BCM43xx_MACFMT "  " BCM43xx_MACFMT "\n", BCM43xx_MACARG(wlhdr->addr1), BCM43xx_MACARG(wlhdr->addr2), BCM43xx_MACARG(wlhdr->addr3));
//printk(BCM43xx_MACFMT "  " BCM43xx_MACFMT "\n", BCM43xx_MACARG(sa), BCM43xx_MACARG(da));
	memcpy(txhdr->rts_cts_mac1, wlhdr->addr1, ETH_ALEN);//FIXME!
//	memcpy(txhdr->rts_cts_mac2, sa, ETH_ALEN);

	*flags |= BCM43xx_TXHDRFLAG_RTSCTS;
	*flags |= BCM43xx_TXHDRFLAG_RTS;
	if (ofdm_modulation)
		*flags |= BCM43xx_TXHDRFLAG_RTSCTS_OFDM;
	if (fallback_ofdm_modulation)
		*flags |= BCM43xx_TXHDRFLAG_RTSCTSFALLBACK_OFDM;
}
				 
void bcm43xx_generate_txhdr(struct bcm43xx_private *bcm,
			    struct bcm43xx_txhdr *txhdr,
			    const unsigned char *fragment_data,
			    const unsigned int fragment_len,
			    const int is_first_fragment,
			    const u16 cookie)
{
	const struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
	const struct ieee80211_hdr_4addr *wireless_header = (const struct ieee80211_hdr_4addr *)fragment_data;
	const struct ieee80211_security *secinfo = &bcm->ieee->sec;
	u8 bitrate;
	u8 fallback_bitrate;
	int ofdm_modulation;
	int fallback_ofdm_modulation;
	u16 plcp_fragment_len = fragment_len;
	u16 flags = 0;
	u16 control = 0;
	u16 wsec_rate = 0;
	u16 encrypt_frame;
	const u16 ftype = WLAN_FC_GET_TYPE(le16_to_cpu(wireless_header->frame_ctl));
	const int is_mgt = (ftype == IEEE80211_FTYPE_MGMT);

	/* Now construct the TX header. */
	memset(txhdr, 0, sizeof(*txhdr));

	bitrate = ieee80211softmac_suggest_txrate(bcm->softmac,
		is_multicast_ether_addr(wireless_header->addr1), is_mgt);
	ofdm_modulation = !(ieee80211_is_cck_rate(bitrate));
	fallback_bitrate = bcm43xx_calc_fallback_rate(bitrate);
	fallback_ofdm_modulation = !(ieee80211_is_cck_rate(fallback_bitrate));

	/* Set Frame Control from 80211 header. */
	txhdr->frame_control = wireless_header->frame_ctl;
	/* Copy address1 from 80211 header. */
	memcpy(txhdr->mac1, wireless_header->addr1, 6);
	/* Set the fallback duration ID. */
	txhdr->fallback_dur_id = bcm43xx_calc_duration_id((const struct ieee80211_hdr *)wireless_header,
							  fallback_bitrate);
	/* Set the cookie (used as driver internal ID for the frame) */
	txhdr->cookie = cpu_to_le16(cookie);

	/* Hardware appends FCS. */
	plcp_fragment_len += IEEE80211_FCS_LEN;

	/* Hardware encryption. */
	encrypt_frame = le16_to_cpup(&wireless_header->frame_ctl) & IEEE80211_FCTL_PROTECTED;
	if (encrypt_frame && !bcm->ieee->host_encrypt) {
		const struct ieee80211_hdr_3addr *hdr = (struct ieee80211_hdr_3addr *)wireless_header;
		memcpy(txhdr->wep_iv, hdr->payload, 4);
		/* Hardware appends ICV. */
		plcp_fragment_len += 4;

		wsec_rate |= (bcm->key[secinfo->active_key].algorithm << BCM43xx_TXHDR_WSEC_ALGO_SHIFT)
			     & BCM43xx_TXHDR_WSEC_ALGO_MASK;
		wsec_rate |= (secinfo->active_key << BCM43xx_TXHDR_WSEC_KEYINDEX_SHIFT)
			     & BCM43xx_TXHDR_WSEC_KEYINDEX_MASK;
	}

	/* Generate the PLCP header and the fallback PLCP header. */
	bcm43xx_generate_plcp_hdr((struct bcm43xx_plcp_hdr4 *)(&txhdr->plcp),
				  plcp_fragment_len,
				  bitrate, ofdm_modulation);
	bcm43xx_generate_plcp_hdr(&txhdr->fallback_plcp, plcp_fragment_len,
				  fallback_bitrate, fallback_ofdm_modulation);

	/* Set the CONTROL field */
	if (ofdm_modulation)
		control |= BCM43xx_TXHDRCTL_OFDM;
	if (bcm->short_preamble) //FIXME: could be the other way around, please test
		control |= BCM43xx_TXHDRCTL_SHORT_PREAMBLE;
	control |= (phy->antenna_diversity << BCM43xx_TXHDRCTL_ANTENNADIV_SHIFT)
		   & BCM43xx_TXHDRCTL_ANTENNADIV_MASK;

	/* Set the FLAGS field */
	if (!is_multicast_ether_addr(wireless_header->addr1) &&
	    !is_broadcast_ether_addr(wireless_header->addr1))
		flags |= BCM43xx_TXHDRFLAG_EXPECTACK;
	if (1 /* FIXME: PS poll?? */)
		flags |= 0x10; // FIXME: unknown meaning.
	if (fallback_ofdm_modulation)
		flags |= BCM43xx_TXHDRFLAG_FALLBACKOFDM;
	if (is_first_fragment)
		flags |= BCM43xx_TXHDRFLAG_FIRSTFRAGMENT;

	/* Set WSEC/RATE field */
	wsec_rate |= (txhdr->plcp.raw[0] << BCM43xx_TXHDR_RATE_SHIFT)
		     & BCM43xx_TXHDR_RATE_MASK;

	/* Generate the RTS/CTS packet, if required. */
	/* FIXME: We should first try with CTS-to-self,
	 *        if we are on 80211g. If we get too many
	 *        failures (hidden nodes), we should switch back to RTS/CTS.
	 */
	if (0/*FIXME txctl->use_rts_cts*/) {
		bcm43xx_generate_rts(phy, txhdr, &flags,
				     0/*FIXME txctl->rts_cts_rate*/,
				     wireless_header);
	}

	txhdr->flags = cpu_to_le16(flags);
	txhdr->control = cpu_to_le16(control);
	txhdr->wsec_rate = cpu_to_le16(wsec_rate);
}

static s8 bcm43xx_rssi_postprocess(struct bcm43xx_private *bcm,
				   u8 in_rssi, int ofdm,
				   int adjust_2053, int adjust_2050)
{
	struct bcm43xx_radioinfo *radio = bcm43xx_current_radio(bcm);
	struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
	s32 tmp;

	switch (radio->version) {
	case 0x2050:
		if (ofdm) {
			tmp = in_rssi;
			if (tmp > 127)
				tmp -= 256;
			tmp *= 73;
			tmp /= 64;
			if (adjust_2050)
				tmp += 25;
			else
				tmp -= 3;
		} else {
			if (bcm->sprom.boardflags & BCM43xx_BFL_RSSI) {
				if (in_rssi > 63)
					in_rssi = 63;
				tmp = radio->nrssi_lt[in_rssi];
				tmp = 31 - tmp;
				tmp *= -131;
				tmp /= 128;
				tmp -= 57;
			} else {
				tmp = in_rssi;
				tmp = 31 - tmp;
				tmp *= -149;
				tmp /= 128;
				tmp -= 68;
			}
			if (phy->type == BCM43xx_PHYTYPE_G &&
			    adjust_2050)
				tmp += 25;
		}
		break;
	case 0x2060:
		if (in_rssi > 127)
			tmp = in_rssi - 256;
		else
			tmp = in_rssi;
		break;
	default:
		tmp = in_rssi;
		tmp -= 11;
		tmp *= 103;
		tmp /= 64;
		if (adjust_2053)
			tmp -= 109;
		else
			tmp -= 83;
	}

	return (s8)tmp;
}

//TODO
#if 0
static s8 bcm43xx_rssinoise_postprocess(struct bcm43xx_private *bcm,
					u8 in_rssi)
{
	struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
	s8 ret;

	if (phy->type == BCM43xx_PHYTYPE_A) {
		//TODO: Incomplete specs.
		ret = 0;
	} else
		ret = bcm43xx_rssi_postprocess(bcm, in_rssi, 0, 1, 1);

	return ret;
}
#endif

int bcm43xx_rx(struct bcm43xx_private *bcm,
	       struct sk_buff *skb,
	       struct bcm43xx_rxhdr *rxhdr)
{
	struct bcm43xx_radioinfo *radio = bcm43xx_current_radio(bcm);
	struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
	struct bcm43xx_plcp_hdr4 *plcp;
	struct ieee80211_rx_stats stats;
	struct ieee80211_hdr_4addr *wlhdr;
	u16 frame_ctl;
	int is_packet_for_us = 0;
	int err = -EINVAL;
	const u16 rxflags1 = le16_to_cpu(rxhdr->flags1);
	const u16 rxflags2 = le16_to_cpu(rxhdr->flags2);
	const u16 rxflags3 = le16_to_cpu(rxhdr->flags3);
	const int is_ofdm = !!(rxflags1 & BCM43xx_RXHDR_FLAGS1_OFDM);

	if (rxflags2 & BCM43xx_RXHDR_FLAGS2_TYPE2FRAME) {
		plcp = (struct bcm43xx_plcp_hdr4 *)(skb->data + 2);
		/* Skip two unknown bytes and the PLCP header. */
		skb_pull(skb, 2 + sizeof(struct bcm43xx_plcp_hdr6));
	} else {
		plcp = (struct bcm43xx_plcp_hdr4 *)(skb->data);
		/* Skip the PLCP header. */
		skb_pull(skb, sizeof(struct bcm43xx_plcp_hdr6));
	}
	/* The SKB contains the PAYLOAD (wireless header + data)
	 * at this point. The FCS at the end is stripped.
	 */

	memset(&stats, 0, sizeof(stats));
	stats.mac_time = le16_to_cpu(rxhdr->mactime);
	stats.rssi = rxhdr->rssi;
	stats.signal = bcm43xx_rssi_postprocess(bcm, rxhdr->rssi, is_ofdm,
					      !!(rxflags1 & BCM43xx_RXHDR_FLAGS1_2053RSSIADJ),
					      !!(rxflags3 & BCM43xx_RXHDR_FLAGS3_2050RSSIADJ));
	stats.noise = bcm->stats.noise;
	if (is_ofdm)
		stats.rate = bcm43xx_plcp_get_bitrate_ofdm(plcp);
	else
		stats.rate = bcm43xx_plcp_get_bitrate_cck(plcp);
	stats.received_channel = radio->channel;
	stats.mask = IEEE80211_STATMASK_SIGNAL |
		     IEEE80211_STATMASK_NOISE |
		     IEEE80211_STATMASK_RATE |
		     IEEE80211_STATMASK_RSSI;
	if (phy->type == BCM43xx_PHYTYPE_A)
		stats.freq = IEEE80211_52GHZ_BAND;
	else
		stats.freq = IEEE80211_24GHZ_BAND;
	stats.len = skb->len;

	bcm->stats.last_rx = jiffies;
	if (bcm->ieee->iw_mode == IW_MODE_MONITOR) {
		err = ieee80211_rx(bcm->ieee, skb, &stats);
		return (err == 0) ? -EINVAL : 0;
	}

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

	switch (bcm->ieee->iw_mode) {
	case IW_MODE_ADHOC:
		if (memcmp(wlhdr->addr1, bcm->net_dev->dev_addr, ETH_ALEN) == 0 ||
		    memcmp(wlhdr->addr3, bcm->ieee->bssid, ETH_ALEN) == 0 ||
		    is_broadcast_ether_addr(wlhdr->addr1) ||
		    is_multicast_ether_addr(wlhdr->addr1) ||
		    bcm->net_dev->flags & IFF_PROMISC)
			is_packet_for_us = 1;
		break;
	case IW_MODE_INFRA:
	default:
		/* When receiving multicast or broadcast packets, filter out
		   the packets we send ourself; we shouldn't see those */
		if (memcmp(wlhdr->addr3, bcm->ieee->bssid, ETH_ALEN) == 0 ||
		    memcmp(wlhdr->addr1, bcm->net_dev->dev_addr, ETH_ALEN) == 0 ||
		    (memcmp(wlhdr->addr3, bcm->net_dev->dev_addr, ETH_ALEN) &&
		     (is_broadcast_ether_addr(wlhdr->addr1) ||
		      is_multicast_ether_addr(wlhdr->addr1) ||
		      bcm->net_dev->flags & IFF_PROMISC)))
			is_packet_for_us = 1;
		break;
	}

	switch (WLAN_FC_GET_TYPE(frame_ctl)) {
	case IEEE80211_FTYPE_MGMT:
		ieee80211_rx_mgt(bcm->ieee, wlhdr, &stats);
		break;
	case IEEE80211_FTYPE_DATA:
		if (is_packet_for_us) {
			err = ieee80211_rx(bcm->ieee, skb, &stats);
			err = (err == 0) ? -EINVAL : 0;
		}
		break;
	case IEEE80211_FTYPE_CTL:
		break;
	default:
		assert(0);
		return -EINVAL;
	}

	return err;
}