summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/ath/ath9k/common.c
blob: c86f7d3593ab48a3c1c1248443f0f2f599a327f8 (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
/*
 * Copyright (c) 2009 Atheros Communications Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/*
 * Module for common driver code between ath9k and ath9k_htc
 */

#include <linux/kernel.h>
#include <linux/module.h>

#include "common.h"

MODULE_AUTHOR("Atheros Communications");
MODULE_DESCRIPTION("Shared library for Atheros wireless 802.11n LAN cards.");
MODULE_LICENSE("Dual BSD/GPL");

int ath9k_cmn_padpos(__le16 frame_control)
{
	int padpos = 24;
	if (ieee80211_has_a4(frame_control)) {
		padpos += ETH_ALEN;
	}
	if (ieee80211_is_data_qos(frame_control)) {
		padpos += IEEE80211_QOS_CTL_LEN;
	}

	return padpos;
}
EXPORT_SYMBOL(ath9k_cmn_padpos);

int ath9k_cmn_get_hw_crypto_keytype(struct sk_buff *skb)
{
	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);

	if (tx_info->control.hw_key) {
		if (tx_info->control.hw_key->alg == ALG_WEP)
			return ATH9K_KEY_TYPE_WEP;
		else if (tx_info->control.hw_key->alg == ALG_TKIP)
			return ATH9K_KEY_TYPE_TKIP;
		else if (tx_info->control.hw_key->alg == ALG_CCMP)
			return ATH9K_KEY_TYPE_AES;
	}

	return ATH9K_KEY_TYPE_CLEAR;
}
EXPORT_SYMBOL(ath9k_cmn_get_hw_crypto_keytype);

static u32 ath9k_get_extchanmode(struct ieee80211_channel *chan,
				 enum nl80211_channel_type channel_type)
{
	u32 chanmode = 0;

	switch (chan->band) {
	case IEEE80211_BAND_2GHZ:
		switch (channel_type) {
		case NL80211_CHAN_NO_HT:
		case NL80211_CHAN_HT20:
			chanmode = CHANNEL_G_HT20;
			break;
		case NL80211_CHAN_HT40PLUS:
			chanmode = CHANNEL_G_HT40PLUS;
			break;
		case NL80211_CHAN_HT40MINUS:
			chanmode = CHANNEL_G_HT40MINUS;
			break;
		}
		break;
	case IEEE80211_BAND_5GHZ:
		switch (channel_type) {
		case NL80211_CHAN_NO_HT:
		case NL80211_CHAN_HT20:
			chanmode = CHANNEL_A_HT20;
			break;
		case NL80211_CHAN_HT40PLUS:
			chanmode = CHANNEL_A_HT40PLUS;
			break;
		case NL80211_CHAN_HT40MINUS:
			chanmode = CHANNEL_A_HT40MINUS;
			break;
		}
		break;
	default:
		break;
	}

	return chanmode;
}

/*
 * Update internal channel flags.
 */
void ath9k_cmn_update_ichannel(struct ieee80211_hw *hw,
			       struct ath9k_channel *ichan)
{
	struct ieee80211_channel *chan = hw->conf.channel;
	struct ieee80211_conf *conf = &hw->conf;

	ichan->channel = chan->center_freq;
	ichan->chan = chan;

	if (chan->band == IEEE80211_BAND_2GHZ) {
		ichan->chanmode = CHANNEL_G;
		ichan->channelFlags = CHANNEL_2GHZ | CHANNEL_OFDM | CHANNEL_G;
	} else {
		ichan->chanmode = CHANNEL_A;
		ichan->channelFlags = CHANNEL_5GHZ | CHANNEL_OFDM;
	}

	if (conf_is_ht(conf))
		ichan->chanmode = ath9k_get_extchanmode(chan,
							conf->channel_type);
}
EXPORT_SYMBOL(ath9k_cmn_update_ichannel);

/*
 * Get the internal channel reference.
 */
struct ath9k_channel *ath9k_cmn_get_curchannel(struct ieee80211_hw *hw,
					       struct ath_hw *ah)
{
	struct ieee80211_channel *curchan = hw->conf.channel;
	struct ath9k_channel *channel;
	u8 chan_idx;

	chan_idx = curchan->hw_value;
	channel = &ah->channels[chan_idx];
	ath9k_cmn_update_ichannel(hw, channel);

	return channel;
}
EXPORT_SYMBOL(ath9k_cmn_get_curchannel);

static int ath_setkey_tkip(struct ath_common *common, u16 keyix, const u8 *key,
			   struct ath9k_keyval *hk, const u8 *addr,
			   bool authenticator)
{
	struct ath_hw *ah = common->ah;
	const u8 *key_rxmic;
	const u8 *key_txmic;

	key_txmic = key + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY;
	key_rxmic = key + NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY;

	if (addr == NULL) {
		/*
		 * Group key installation - only two key cache entries are used
		 * regardless of splitmic capability since group key is only
		 * used either for TX or RX.
		 */
		if (authenticator) {
			memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic));
			memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_mic));
		} else {
			memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
			memcpy(hk->kv_txmic, key_rxmic, sizeof(hk->kv_mic));
		}
		return ath9k_hw_set_keycache_entry(ah, keyix, hk, addr);
	}
	if (!common->splitmic) {
		/* TX and RX keys share the same key cache entry. */
		memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
		memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_txmic));
		return ath9k_hw_set_keycache_entry(ah, keyix, hk, addr);
	}

	/* Separate key cache entries for TX and RX */

	/* TX key goes at first index, RX key at +32. */
	memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic));
	if (!ath9k_hw_set_keycache_entry(ah, keyix, hk, NULL)) {
		/* TX MIC entry failed. No need to proceed further */
		ath_print(common, ATH_DBG_FATAL,
			  "Setting TX MIC Key Failed\n");
		return 0;
	}

	memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
	/* XXX delete tx key on failure? */
	return ath9k_hw_set_keycache_entry(ah, keyix + 32, hk, addr);
}

static int ath_reserve_key_cache_slot_tkip(struct ath_common *common)
{
	int i;

	for (i = IEEE80211_WEP_NKID; i < common->keymax / 2; i++) {
		if (test_bit(i, common->keymap) ||
		    test_bit(i + 64, common->keymap))
			continue; /* At least one part of TKIP key allocated */
		if (common->splitmic &&
		    (test_bit(i + 32, common->keymap) ||
		     test_bit(i + 64 + 32, common->keymap)))
			continue; /* At least one part of TKIP key allocated */

		/* Found a free slot for a TKIP key */
		return i;
	}
	return -1;
}

static int ath_reserve_key_cache_slot(struct ath_common *common,
				      enum ieee80211_key_alg alg)
{
	int i;

	if (alg == ALG_TKIP)
		return ath_reserve_key_cache_slot_tkip(common);

	/* First, try to find slots that would not be available for TKIP. */
	if (common->splitmic) {
		for (i = IEEE80211_WEP_NKID; i < common->keymax / 4; i++) {
			if (!test_bit(i, common->keymap) &&
			    (test_bit(i + 32, common->keymap) ||
			     test_bit(i + 64, common->keymap) ||
			     test_bit(i + 64 + 32, common->keymap)))
				return i;
			if (!test_bit(i + 32, common->keymap) &&
			    (test_bit(i, common->keymap) ||
			     test_bit(i + 64, common->keymap) ||
			     test_bit(i + 64 + 32, common->keymap)))
				return i + 32;
			if (!test_bit(i + 64, common->keymap) &&
			    (test_bit(i , common->keymap) ||
			     test_bit(i + 32, common->keymap) ||
			     test_bit(i + 64 + 32, common->keymap)))
				return i + 64;
			if (!test_bit(i + 64 + 32, common->keymap) &&
			    (test_bit(i, common->keymap) ||
			     test_bit(i + 32, common->keymap) ||
			     test_bit(i + 64, common->keymap)))
				return i + 64 + 32;
		}
	} else {
		for (i = IEEE80211_WEP_NKID; i < common->keymax / 2; i++) {
			if (!test_bit(i, common->keymap) &&
			    test_bit(i + 64, common->keymap))
				return i;
			if (test_bit(i, common->keymap) &&
			    !test_bit(i + 64, common->keymap))
				return i + 64;
		}
	}

	/* No partially used TKIP slots, pick any available slot */
	for (i = IEEE80211_WEP_NKID; i < common->keymax; i++) {
		/* Do not allow slots that could be needed for TKIP group keys
		 * to be used. This limitation could be removed if we know that
		 * TKIP will not be used. */
		if (i >= 64 && i < 64 + IEEE80211_WEP_NKID)
			continue;
		if (common->splitmic) {
			if (i >= 32 && i < 32 + IEEE80211_WEP_NKID)
				continue;
			if (i >= 64 + 32 && i < 64 + 32 + IEEE80211_WEP_NKID)
				continue;
		}

		if (!test_bit(i, common->keymap))
			return i; /* Found a free slot for a key */
	}

	/* No free slot found */
	return -1;
}

/*
 * Configure encryption in the HW.
 */
int ath9k_cmn_key_config(struct ath_common *common,
			 struct ieee80211_vif *vif,
			 struct ieee80211_sta *sta,
			 struct ieee80211_key_conf *key)
{
	struct ath_hw *ah = common->ah;
	struct ath9k_keyval hk;
	const u8 *mac = NULL;
	u8 gmac[ETH_ALEN];
	int ret = 0;
	int idx;

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

	switch (key->alg) {
	case ALG_WEP:
		hk.kv_type = ATH9K_CIPHER_WEP;
		break;
	case ALG_TKIP:
		hk.kv_type = ATH9K_CIPHER_TKIP;
		break;
	case ALG_CCMP:
		hk.kv_type = ATH9K_CIPHER_AES_CCM;
		break;
	default:
		return -EOPNOTSUPP;
	}

	hk.kv_len = key->keylen;
	memcpy(hk.kv_val, key->key, key->keylen);

	if (!(key->flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
		switch (vif->type) {
		case NL80211_IFTYPE_AP:
			memcpy(gmac, vif->addr, ETH_ALEN);
			gmac[0] |= 0x01;
			mac = gmac;
			idx = ath_reserve_key_cache_slot(common, key->alg);
			break;
		case NL80211_IFTYPE_ADHOC:
			if (!sta) {
				idx = key->keyidx;
				break;
			}
			memcpy(gmac, sta->addr, ETH_ALEN);
			gmac[0] |= 0x01;
			mac = gmac;
			idx = ath_reserve_key_cache_slot(common, key->alg);
			break;
		default:
			idx = key->keyidx;
			break;
		}
	} else if (key->keyidx) {
		if (WARN_ON(!sta))
			return -EOPNOTSUPP;
		mac = sta->addr;

		if (vif->type != NL80211_IFTYPE_AP) {
			/* Only keyidx 0 should be used with unicast key, but
			 * allow this for client mode for now. */
			idx = key->keyidx;
		} else
			return -EIO;
	} else {
		if (WARN_ON(!sta))
			return -EOPNOTSUPP;
		mac = sta->addr;

		idx = ath_reserve_key_cache_slot(common, key->alg);
	}

	if (idx < 0)
		return -ENOSPC; /* no free key cache entries */

	if (key->alg == ALG_TKIP)
		ret = ath_setkey_tkip(common, idx, key->key, &hk, mac,
				      vif->type == NL80211_IFTYPE_AP);
	else
		ret = ath9k_hw_set_keycache_entry(ah, idx, &hk, mac);

	if (!ret)
		return -EIO;

	set_bit(idx, common->keymap);
	if (key->alg == ALG_TKIP) {
		set_bit(idx + 64, common->keymap);
		if (common->splitmic) {
			set_bit(idx + 32, common->keymap);
			set_bit(idx + 64 + 32, common->keymap);
		}
	}

	return idx;
}
EXPORT_SYMBOL(ath9k_cmn_key_config);

/*
 * Delete Key.
 */
void ath9k_cmn_key_delete(struct ath_common *common,
			  struct ieee80211_key_conf *key)
{
	struct ath_hw *ah = common->ah;

	ath9k_hw_keyreset(ah, key->hw_key_idx);
	if (key->hw_key_idx < IEEE80211_WEP_NKID)
		return;

	clear_bit(key->hw_key_idx, common->keymap);
	if (key->alg != ALG_TKIP)
		return;

	clear_bit(key->hw_key_idx + 64, common->keymap);
	if (common->splitmic) {
		ath9k_hw_keyreset(ah, key->hw_key_idx + 32);
		clear_bit(key->hw_key_idx + 32, common->keymap);
		clear_bit(key->hw_key_idx + 64 + 32, common->keymap);
	}
}
EXPORT_SYMBOL(ath9k_cmn_key_delete);

int ath9k_cmn_count_streams(unsigned int chainmask, int max)
{
	int streams = 0;

	do {
		if (++streams == max)
			break;
	} while ((chainmask = chainmask & (chainmask - 1)));

	return streams;
}
EXPORT_SYMBOL(ath9k_cmn_count_streams);

static int __init ath9k_cmn_init(void)
{
	return 0;
}
module_init(ath9k_cmn_init);

static void __exit ath9k_cmn_exit(void)
{
	return;
}
module_exit(ath9k_cmn_exit);