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1bba5b73 BR |
1 | /* |
2 | * Copyright (c) 2009 Atheros Communications Inc. | |
3 | * Copyright (c) 2010 Bruno Randolf <br1@einfach.org> | |
4 | * | |
5 | * Permission to use, copy, modify, and/or distribute this software for any | |
6 | * purpose with or without fee is hereby granted, provided that the above | |
7 | * copyright notice and this permission notice appear in all copies. | |
8 | * | |
9 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
10 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
11 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
12 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
13 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
14 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
15 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
16 | */ | |
17 | ||
ee40fa06 | 18 | #include <linux/export.h> |
1bba5b73 BR |
19 | #include <asm/unaligned.h> |
20 | #include <net/mac80211.h> | |
21 | ||
22 | #include "ath.h" | |
23 | #include "reg.h" | |
1bba5b73 BR |
24 | |
25 | #define REG_READ (common->ops->read) | |
26 | #define REG_WRITE(_ah, _reg, _val) (common->ops->write)(_ah, _val, _reg) | |
b0a9ede2 RM |
27 | #define ENABLE_REGWRITE_BUFFER(_ah) \ |
28 | if (common->ops->enable_write_buffer) \ | |
29 | common->ops->enable_write_buffer((_ah)); | |
30 | ||
31 | #define REGWRITE_BUFFER_FLUSH(_ah) \ | |
32 | if (common->ops->write_flush) \ | |
33 | common->ops->write_flush((_ah)); | |
34 | ||
1bba5b73 BR |
35 | |
36 | #define IEEE80211_WEP_NKID 4 /* number of key ids */ | |
37 | ||
38 | /************************/ | |
39 | /* Key Cache Management */ | |
40 | /************************/ | |
41 | ||
42 | bool ath_hw_keyreset(struct ath_common *common, u16 entry) | |
43 | { | |
44 | u32 keyType; | |
45 | void *ah = common->ah; | |
46 | ||
47 | if (entry >= common->keymax) { | |
3800276a | 48 | ath_err(common, "keycache entry %u out of range\n", entry); |
1bba5b73 BR |
49 | return false; |
50 | } | |
51 | ||
52 | keyType = REG_READ(ah, AR_KEYTABLE_TYPE(entry)); | |
53 | ||
b0a9ede2 RM |
54 | ENABLE_REGWRITE_BUFFER(ah); |
55 | ||
1bba5b73 BR |
56 | REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), 0); |
57 | REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), 0); | |
58 | REG_WRITE(ah, AR_KEYTABLE_KEY2(entry), 0); | |
59 | REG_WRITE(ah, AR_KEYTABLE_KEY3(entry), 0); | |
60 | REG_WRITE(ah, AR_KEYTABLE_KEY4(entry), 0); | |
61 | REG_WRITE(ah, AR_KEYTABLE_TYPE(entry), AR_KEYTABLE_TYPE_CLR); | |
62 | REG_WRITE(ah, AR_KEYTABLE_MAC0(entry), 0); | |
63 | REG_WRITE(ah, AR_KEYTABLE_MAC1(entry), 0); | |
64 | ||
65 | if (keyType == AR_KEYTABLE_TYPE_TKIP) { | |
66 | u16 micentry = entry + 64; | |
67 | ||
68 | REG_WRITE(ah, AR_KEYTABLE_KEY0(micentry), 0); | |
69 | REG_WRITE(ah, AR_KEYTABLE_KEY1(micentry), 0); | |
70 | REG_WRITE(ah, AR_KEYTABLE_KEY2(micentry), 0); | |
71 | REG_WRITE(ah, AR_KEYTABLE_KEY3(micentry), 0); | |
8e546104 | 72 | if (common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED) { |
998d516d | 73 | REG_WRITE(ah, AR_KEYTABLE_KEY4(micentry), 0); |
8e546104 JM |
74 | REG_WRITE(ah, AR_KEYTABLE_TYPE(micentry), |
75 | AR_KEYTABLE_TYPE_CLR); | |
76 | } | |
1bba5b73 BR |
77 | |
78 | } | |
79 | ||
b0a9ede2 RM |
80 | REGWRITE_BUFFER_FLUSH(ah); |
81 | ||
1bba5b73 BR |
82 | return true; |
83 | } | |
84 | EXPORT_SYMBOL(ath_hw_keyreset); | |
85 | ||
a3685d11 LR |
86 | static bool ath_hw_keysetmac(struct ath_common *common, |
87 | u16 entry, const u8 *mac) | |
1bba5b73 BR |
88 | { |
89 | u32 macHi, macLo; | |
90 | u32 unicast_flag = AR_KEYTABLE_VALID; | |
91 | void *ah = common->ah; | |
92 | ||
93 | if (entry >= common->keymax) { | |
3800276a | 94 | ath_err(common, "keycache entry %u out of range\n", entry); |
1bba5b73 BR |
95 | return false; |
96 | } | |
97 | ||
98 | if (mac != NULL) { | |
99 | /* | |
100 | * AR_KEYTABLE_VALID indicates that the address is a unicast | |
101 | * address, which must match the transmitter address for | |
102 | * decrypting frames. | |
103 | * Not setting this bit allows the hardware to use the key | |
104 | * for multicast frame decryption. | |
105 | */ | |
106 | if (mac[0] & 0x01) | |
107 | unicast_flag = 0; | |
108 | ||
d47d78df PR |
109 | macLo = get_unaligned_le32(mac); |
110 | macHi = get_unaligned_le16(mac + 4); | |
1bba5b73 BR |
111 | macLo >>= 1; |
112 | macLo |= (macHi & 1) << 31; | |
113 | macHi >>= 1; | |
114 | } else { | |
115 | macLo = macHi = 0; | |
116 | } | |
b0a9ede2 RM |
117 | ENABLE_REGWRITE_BUFFER(ah); |
118 | ||
1bba5b73 BR |
119 | REG_WRITE(ah, AR_KEYTABLE_MAC0(entry), macLo); |
120 | REG_WRITE(ah, AR_KEYTABLE_MAC1(entry), macHi | unicast_flag); | |
121 | ||
b0a9ede2 RM |
122 | REGWRITE_BUFFER_FLUSH(ah); |
123 | ||
1bba5b73 BR |
124 | return true; |
125 | } | |
126 | ||
f8c2a087 LR |
127 | static bool ath_hw_set_keycache_entry(struct ath_common *common, u16 entry, |
128 | const struct ath_keyval *k, | |
129 | const u8 *mac) | |
1bba5b73 BR |
130 | { |
131 | void *ah = common->ah; | |
132 | u32 key0, key1, key2, key3, key4; | |
133 | u32 keyType; | |
134 | ||
135 | if (entry >= common->keymax) { | |
3800276a | 136 | ath_err(common, "keycache entry %u out of range\n", entry); |
1bba5b73 BR |
137 | return false; |
138 | } | |
139 | ||
140 | switch (k->kv_type) { | |
141 | case ATH_CIPHER_AES_OCB: | |
142 | keyType = AR_KEYTABLE_TYPE_AES; | |
143 | break; | |
144 | case ATH_CIPHER_AES_CCM: | |
145 | if (!(common->crypt_caps & ATH_CRYPT_CAP_CIPHER_AESCCM)) { | |
d2182b69 | 146 | ath_dbg(common, ANY, |
226afe68 | 147 | "AES-CCM not supported by this mac rev\n"); |
1bba5b73 BR |
148 | return false; |
149 | } | |
150 | keyType = AR_KEYTABLE_TYPE_CCM; | |
151 | break; | |
152 | case ATH_CIPHER_TKIP: | |
153 | keyType = AR_KEYTABLE_TYPE_TKIP; | |
154 | if (entry + 64 >= common->keymax) { | |
d2182b69 | 155 | ath_dbg(common, ANY, |
226afe68 | 156 | "entry %u inappropriate for TKIP\n", entry); |
1bba5b73 BR |
157 | return false; |
158 | } | |
159 | break; | |
160 | case ATH_CIPHER_WEP: | |
161 | if (k->kv_len < WLAN_KEY_LEN_WEP40) { | |
d2182b69 JP |
162 | ath_dbg(common, ANY, "WEP key length %u too small\n", |
163 | k->kv_len); | |
1bba5b73 BR |
164 | return false; |
165 | } | |
166 | if (k->kv_len <= WLAN_KEY_LEN_WEP40) | |
167 | keyType = AR_KEYTABLE_TYPE_40; | |
168 | else if (k->kv_len <= WLAN_KEY_LEN_WEP104) | |
169 | keyType = AR_KEYTABLE_TYPE_104; | |
170 | else | |
171 | keyType = AR_KEYTABLE_TYPE_128; | |
172 | break; | |
173 | case ATH_CIPHER_CLR: | |
174 | keyType = AR_KEYTABLE_TYPE_CLR; | |
175 | break; | |
176 | default: | |
3800276a | 177 | ath_err(common, "cipher %u not supported\n", k->kv_type); |
1bba5b73 BR |
178 | return false; |
179 | } | |
180 | ||
181 | key0 = get_unaligned_le32(k->kv_val + 0); | |
182 | key1 = get_unaligned_le16(k->kv_val + 4); | |
183 | key2 = get_unaligned_le32(k->kv_val + 6); | |
184 | key3 = get_unaligned_le16(k->kv_val + 10); | |
185 | key4 = get_unaligned_le32(k->kv_val + 12); | |
186 | if (k->kv_len <= WLAN_KEY_LEN_WEP104) | |
187 | key4 &= 0xff; | |
188 | ||
189 | /* | |
190 | * Note: Key cache registers access special memory area that requires | |
191 | * two 32-bit writes to actually update the values in the internal | |
192 | * memory. Consequently, the exact order and pairs used here must be | |
193 | * maintained. | |
194 | */ | |
195 | ||
196 | if (keyType == AR_KEYTABLE_TYPE_TKIP) { | |
197 | u16 micentry = entry + 64; | |
198 | ||
199 | /* | |
200 | * Write inverted key[47:0] first to avoid Michael MIC errors | |
201 | * on frames that could be sent or received at the same time. | |
202 | * The correct key will be written in the end once everything | |
203 | * else is ready. | |
204 | */ | |
205 | REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), ~key0); | |
206 | REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), ~key1); | |
207 | ||
208 | /* Write key[95:48] */ | |
209 | REG_WRITE(ah, AR_KEYTABLE_KEY2(entry), key2); | |
210 | REG_WRITE(ah, AR_KEYTABLE_KEY3(entry), key3); | |
211 | ||
212 | /* Write key[127:96] and key type */ | |
213 | REG_WRITE(ah, AR_KEYTABLE_KEY4(entry), key4); | |
214 | REG_WRITE(ah, AR_KEYTABLE_TYPE(entry), keyType); | |
215 | ||
216 | /* Write MAC address for the entry */ | |
217 | (void) ath_hw_keysetmac(common, entry, mac); | |
218 | ||
117675d0 | 219 | if (common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED) { |
1bba5b73 BR |
220 | /* |
221 | * TKIP uses two key cache entries: | |
222 | * Michael MIC TX/RX keys in the same key cache entry | |
223 | * (idx = main index + 64): | |
224 | * key0 [31:0] = RX key [31:0] | |
225 | * key1 [15:0] = TX key [31:16] | |
226 | * key1 [31:16] = reserved | |
227 | * key2 [31:0] = RX key [63:32] | |
228 | * key3 [15:0] = TX key [15:0] | |
229 | * key3 [31:16] = reserved | |
230 | * key4 [31:0] = TX key [63:32] | |
231 | */ | |
232 | u32 mic0, mic1, mic2, mic3, mic4; | |
233 | ||
234 | mic0 = get_unaligned_le32(k->kv_mic + 0); | |
235 | mic2 = get_unaligned_le32(k->kv_mic + 4); | |
236 | mic1 = get_unaligned_le16(k->kv_txmic + 2) & 0xffff; | |
237 | mic3 = get_unaligned_le16(k->kv_txmic + 0) & 0xffff; | |
238 | mic4 = get_unaligned_le32(k->kv_txmic + 4); | |
239 | ||
b0a9ede2 RM |
240 | ENABLE_REGWRITE_BUFFER(ah); |
241 | ||
1bba5b73 BR |
242 | /* Write RX[31:0] and TX[31:16] */ |
243 | REG_WRITE(ah, AR_KEYTABLE_KEY0(micentry), mic0); | |
244 | REG_WRITE(ah, AR_KEYTABLE_KEY1(micentry), mic1); | |
245 | ||
246 | /* Write RX[63:32] and TX[15:0] */ | |
247 | REG_WRITE(ah, AR_KEYTABLE_KEY2(micentry), mic2); | |
248 | REG_WRITE(ah, AR_KEYTABLE_KEY3(micentry), mic3); | |
249 | ||
250 | /* Write TX[63:32] and keyType(reserved) */ | |
251 | REG_WRITE(ah, AR_KEYTABLE_KEY4(micentry), mic4); | |
252 | REG_WRITE(ah, AR_KEYTABLE_TYPE(micentry), | |
253 | AR_KEYTABLE_TYPE_CLR); | |
254 | ||
b0a9ede2 RM |
255 | REGWRITE_BUFFER_FLUSH(ah); |
256 | ||
1bba5b73 BR |
257 | } else { |
258 | /* | |
259 | * TKIP uses four key cache entries (two for group | |
260 | * keys): | |
261 | * Michael MIC TX/RX keys are in different key cache | |
262 | * entries (idx = main index + 64 for TX and | |
263 | * main index + 32 + 96 for RX): | |
264 | * key0 [31:0] = TX/RX MIC key [31:0] | |
265 | * key1 [31:0] = reserved | |
266 | * key2 [31:0] = TX/RX MIC key [63:32] | |
267 | * key3 [31:0] = reserved | |
268 | * key4 [31:0] = reserved | |
269 | * | |
270 | * Upper layer code will call this function separately | |
271 | * for TX and RX keys when these registers offsets are | |
272 | * used. | |
273 | */ | |
274 | u32 mic0, mic2; | |
275 | ||
276 | mic0 = get_unaligned_le32(k->kv_mic + 0); | |
277 | mic2 = get_unaligned_le32(k->kv_mic + 4); | |
278 | ||
b0a9ede2 RM |
279 | ENABLE_REGWRITE_BUFFER(ah); |
280 | ||
1bba5b73 BR |
281 | /* Write MIC key[31:0] */ |
282 | REG_WRITE(ah, AR_KEYTABLE_KEY0(micentry), mic0); | |
283 | REG_WRITE(ah, AR_KEYTABLE_KEY1(micentry), 0); | |
284 | ||
285 | /* Write MIC key[63:32] */ | |
286 | REG_WRITE(ah, AR_KEYTABLE_KEY2(micentry), mic2); | |
287 | REG_WRITE(ah, AR_KEYTABLE_KEY3(micentry), 0); | |
288 | ||
289 | /* Write TX[63:32] and keyType(reserved) */ | |
290 | REG_WRITE(ah, AR_KEYTABLE_KEY4(micentry), 0); | |
291 | REG_WRITE(ah, AR_KEYTABLE_TYPE(micentry), | |
292 | AR_KEYTABLE_TYPE_CLR); | |
b0a9ede2 RM |
293 | |
294 | REGWRITE_BUFFER_FLUSH(ah); | |
1bba5b73 BR |
295 | } |
296 | ||
b0a9ede2 RM |
297 | ENABLE_REGWRITE_BUFFER(ah); |
298 | ||
1bba5b73 BR |
299 | /* MAC address registers are reserved for the MIC entry */ |
300 | REG_WRITE(ah, AR_KEYTABLE_MAC0(micentry), 0); | |
301 | REG_WRITE(ah, AR_KEYTABLE_MAC1(micentry), 0); | |
302 | ||
303 | /* | |
304 | * Write the correct (un-inverted) key[47:0] last to enable | |
305 | * TKIP now that all other registers are set with correct | |
306 | * values. | |
307 | */ | |
308 | REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), key0); | |
309 | REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), key1); | |
b0a9ede2 RM |
310 | |
311 | REGWRITE_BUFFER_FLUSH(ah); | |
1bba5b73 | 312 | } else { |
b0a9ede2 RM |
313 | ENABLE_REGWRITE_BUFFER(ah); |
314 | ||
1bba5b73 BR |
315 | /* Write key[47:0] */ |
316 | REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), key0); | |
317 | REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), key1); | |
318 | ||
319 | /* Write key[95:48] */ | |
320 | REG_WRITE(ah, AR_KEYTABLE_KEY2(entry), key2); | |
321 | REG_WRITE(ah, AR_KEYTABLE_KEY3(entry), key3); | |
322 | ||
323 | /* Write key[127:96] and key type */ | |
324 | REG_WRITE(ah, AR_KEYTABLE_KEY4(entry), key4); | |
325 | REG_WRITE(ah, AR_KEYTABLE_TYPE(entry), keyType); | |
326 | ||
b0a9ede2 RM |
327 | REGWRITE_BUFFER_FLUSH(ah); |
328 | ||
1bba5b73 BR |
329 | /* Write MAC address for the entry */ |
330 | (void) ath_hw_keysetmac(common, entry, mac); | |
331 | } | |
332 | ||
333 | return true; | |
334 | } | |
335 | ||
336 | static int ath_setkey_tkip(struct ath_common *common, u16 keyix, const u8 *key, | |
337 | struct ath_keyval *hk, const u8 *addr, | |
338 | bool authenticator) | |
339 | { | |
340 | const u8 *key_rxmic; | |
341 | const u8 *key_txmic; | |
342 | ||
343 | key_txmic = key + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY; | |
344 | key_rxmic = key + NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY; | |
345 | ||
346 | if (addr == NULL) { | |
347 | /* | |
348 | * Group key installation - only two key cache entries are used | |
349 | * regardless of splitmic capability since group key is only | |
350 | * used either for TX or RX. | |
351 | */ | |
352 | if (authenticator) { | |
353 | memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic)); | |
354 | memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_mic)); | |
355 | } else { | |
356 | memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic)); | |
357 | memcpy(hk->kv_txmic, key_rxmic, sizeof(hk->kv_mic)); | |
358 | } | |
359 | return ath_hw_set_keycache_entry(common, keyix, hk, addr); | |
360 | } | |
117675d0 | 361 | if (common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED) { |
1bba5b73 BR |
362 | /* TX and RX keys share the same key cache entry. */ |
363 | memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic)); | |
364 | memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_txmic)); | |
365 | return ath_hw_set_keycache_entry(common, keyix, hk, addr); | |
366 | } | |
367 | ||
368 | /* Separate key cache entries for TX and RX */ | |
369 | ||
370 | /* TX key goes at first index, RX key at +32. */ | |
371 | memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic)); | |
372 | if (!ath_hw_set_keycache_entry(common, keyix, hk, NULL)) { | |
373 | /* TX MIC entry failed. No need to proceed further */ | |
3800276a | 374 | ath_err(common, "Setting TX MIC Key Failed\n"); |
1bba5b73 BR |
375 | return 0; |
376 | } | |
377 | ||
378 | memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic)); | |
379 | /* XXX delete tx key on failure? */ | |
380 | return ath_hw_set_keycache_entry(common, keyix + 32, hk, addr); | |
381 | } | |
382 | ||
383 | static int ath_reserve_key_cache_slot_tkip(struct ath_common *common) | |
384 | { | |
385 | int i; | |
386 | ||
387 | for (i = IEEE80211_WEP_NKID; i < common->keymax / 2; i++) { | |
388 | if (test_bit(i, common->keymap) || | |
389 | test_bit(i + 64, common->keymap)) | |
390 | continue; /* At least one part of TKIP key allocated */ | |
117675d0 | 391 | if (!(common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED) && |
1bba5b73 BR |
392 | (test_bit(i + 32, common->keymap) || |
393 | test_bit(i + 64 + 32, common->keymap))) | |
394 | continue; /* At least one part of TKIP key allocated */ | |
395 | ||
396 | /* Found a free slot for a TKIP key */ | |
397 | return i; | |
398 | } | |
399 | return -1; | |
400 | } | |
401 | ||
402 | static int ath_reserve_key_cache_slot(struct ath_common *common, | |
403 | u32 cipher) | |
404 | { | |
405 | int i; | |
406 | ||
407 | if (cipher == WLAN_CIPHER_SUITE_TKIP) | |
408 | return ath_reserve_key_cache_slot_tkip(common); | |
409 | ||
410 | /* First, try to find slots that would not be available for TKIP. */ | |
117675d0 | 411 | if (!(common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED)) { |
1bba5b73 BR |
412 | for (i = IEEE80211_WEP_NKID; i < common->keymax / 4; i++) { |
413 | if (!test_bit(i, common->keymap) && | |
414 | (test_bit(i + 32, common->keymap) || | |
415 | test_bit(i + 64, common->keymap) || | |
416 | test_bit(i + 64 + 32, common->keymap))) | |
417 | return i; | |
418 | if (!test_bit(i + 32, common->keymap) && | |
419 | (test_bit(i, common->keymap) || | |
420 | test_bit(i + 64, common->keymap) || | |
421 | test_bit(i + 64 + 32, common->keymap))) | |
422 | return i + 32; | |
423 | if (!test_bit(i + 64, common->keymap) && | |
424 | (test_bit(i , common->keymap) || | |
425 | test_bit(i + 32, common->keymap) || | |
426 | test_bit(i + 64 + 32, common->keymap))) | |
427 | return i + 64; | |
428 | if (!test_bit(i + 64 + 32, common->keymap) && | |
429 | (test_bit(i, common->keymap) || | |
430 | test_bit(i + 32, common->keymap) || | |
431 | test_bit(i + 64, common->keymap))) | |
432 | return i + 64 + 32; | |
433 | } | |
434 | } else { | |
435 | for (i = IEEE80211_WEP_NKID; i < common->keymax / 2; i++) { | |
436 | if (!test_bit(i, common->keymap) && | |
437 | test_bit(i + 64, common->keymap)) | |
438 | return i; | |
439 | if (test_bit(i, common->keymap) && | |
440 | !test_bit(i + 64, common->keymap)) | |
441 | return i + 64; | |
442 | } | |
443 | } | |
444 | ||
445 | /* No partially used TKIP slots, pick any available slot */ | |
446 | for (i = IEEE80211_WEP_NKID; i < common->keymax; i++) { | |
447 | /* Do not allow slots that could be needed for TKIP group keys | |
448 | * to be used. This limitation could be removed if we know that | |
449 | * TKIP will not be used. */ | |
450 | if (i >= 64 && i < 64 + IEEE80211_WEP_NKID) | |
451 | continue; | |
117675d0 | 452 | if (!(common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED)) { |
1bba5b73 BR |
453 | if (i >= 32 && i < 32 + IEEE80211_WEP_NKID) |
454 | continue; | |
455 | if (i >= 64 + 32 && i < 64 + 32 + IEEE80211_WEP_NKID) | |
456 | continue; | |
457 | } | |
458 | ||
459 | if (!test_bit(i, common->keymap)) | |
460 | return i; /* Found a free slot for a key */ | |
461 | } | |
462 | ||
463 | /* No free slot found */ | |
464 | return -1; | |
465 | } | |
466 | ||
467 | /* | |
468 | * Configure encryption in the HW. | |
469 | */ | |
470 | int ath_key_config(struct ath_common *common, | |
471 | struct ieee80211_vif *vif, | |
472 | struct ieee80211_sta *sta, | |
473 | struct ieee80211_key_conf *key) | |
474 | { | |
475 | struct ath_keyval hk; | |
476 | const u8 *mac = NULL; | |
477 | u8 gmac[ETH_ALEN]; | |
478 | int ret = 0; | |
479 | int idx; | |
480 | ||
481 | memset(&hk, 0, sizeof(hk)); | |
482 | ||
483 | switch (key->cipher) { | |
93ae2dd2 FF |
484 | case 0: |
485 | hk.kv_type = ATH_CIPHER_CLR; | |
486 | break; | |
1bba5b73 BR |
487 | case WLAN_CIPHER_SUITE_WEP40: |
488 | case WLAN_CIPHER_SUITE_WEP104: | |
489 | hk.kv_type = ATH_CIPHER_WEP; | |
490 | break; | |
491 | case WLAN_CIPHER_SUITE_TKIP: | |
492 | hk.kv_type = ATH_CIPHER_TKIP; | |
493 | break; | |
494 | case WLAN_CIPHER_SUITE_CCMP: | |
495 | hk.kv_type = ATH_CIPHER_AES_CCM; | |
496 | break; | |
497 | default: | |
498 | return -EOPNOTSUPP; | |
499 | } | |
500 | ||
501 | hk.kv_len = key->keylen; | |
93ae2dd2 FF |
502 | if (key->keylen) |
503 | memcpy(hk.kv_val, key->key, key->keylen); | |
1bba5b73 BR |
504 | |
505 | if (!(key->flags & IEEE80211_KEY_FLAG_PAIRWISE)) { | |
506 | switch (vif->type) { | |
507 | case NL80211_IFTYPE_AP: | |
508 | memcpy(gmac, vif->addr, ETH_ALEN); | |
509 | gmac[0] |= 0x01; | |
510 | mac = gmac; | |
511 | idx = ath_reserve_key_cache_slot(common, key->cipher); | |
512 | break; | |
513 | case NL80211_IFTYPE_ADHOC: | |
514 | if (!sta) { | |
515 | idx = key->keyidx; | |
516 | break; | |
517 | } | |
518 | memcpy(gmac, sta->addr, ETH_ALEN); | |
519 | gmac[0] |= 0x01; | |
520 | mac = gmac; | |
521 | idx = ath_reserve_key_cache_slot(common, key->cipher); | |
522 | break; | |
523 | default: | |
524 | idx = key->keyidx; | |
525 | break; | |
526 | } | |
527 | } else if (key->keyidx) { | |
528 | if (WARN_ON(!sta)) | |
529 | return -EOPNOTSUPP; | |
530 | mac = sta->addr; | |
531 | ||
532 | if (vif->type != NL80211_IFTYPE_AP) { | |
533 | /* Only keyidx 0 should be used with unicast key, but | |
534 | * allow this for client mode for now. */ | |
535 | idx = key->keyidx; | |
536 | } else | |
537 | return -EIO; | |
538 | } else { | |
539 | if (WARN_ON(!sta)) | |
540 | return -EOPNOTSUPP; | |
541 | mac = sta->addr; | |
542 | ||
543 | idx = ath_reserve_key_cache_slot(common, key->cipher); | |
544 | } | |
545 | ||
546 | if (idx < 0) | |
547 | return -ENOSPC; /* no free key cache entries */ | |
548 | ||
549 | if (key->cipher == WLAN_CIPHER_SUITE_TKIP) | |
550 | ret = ath_setkey_tkip(common, idx, key->key, &hk, mac, | |
551 | vif->type == NL80211_IFTYPE_AP); | |
552 | else | |
553 | ret = ath_hw_set_keycache_entry(common, idx, &hk, mac); | |
554 | ||
555 | if (!ret) | |
556 | return -EIO; | |
557 | ||
558 | set_bit(idx, common->keymap); | |
bed3d9c0 FF |
559 | if (key->cipher == WLAN_CIPHER_SUITE_CCMP) |
560 | set_bit(idx, common->ccmp_keymap); | |
561 | ||
1bba5b73 BR |
562 | if (key->cipher == WLAN_CIPHER_SUITE_TKIP) { |
563 | set_bit(idx + 64, common->keymap); | |
564 | set_bit(idx, common->tkip_keymap); | |
565 | set_bit(idx + 64, common->tkip_keymap); | |
117675d0 | 566 | if (!(common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED)) { |
1bba5b73 BR |
567 | set_bit(idx + 32, common->keymap); |
568 | set_bit(idx + 64 + 32, common->keymap); | |
569 | set_bit(idx + 32, common->tkip_keymap); | |
570 | set_bit(idx + 64 + 32, common->tkip_keymap); | |
571 | } | |
572 | } | |
573 | ||
574 | return idx; | |
575 | } | |
576 | EXPORT_SYMBOL(ath_key_config); | |
577 | ||
578 | /* | |
579 | * Delete Key. | |
580 | */ | |
581 | void ath_key_delete(struct ath_common *common, struct ieee80211_key_conf *key) | |
582 | { | |
583 | ath_hw_keyreset(common, key->hw_key_idx); | |
584 | if (key->hw_key_idx < IEEE80211_WEP_NKID) | |
585 | return; | |
586 | ||
587 | clear_bit(key->hw_key_idx, common->keymap); | |
bed3d9c0 | 588 | clear_bit(key->hw_key_idx, common->ccmp_keymap); |
1bba5b73 BR |
589 | if (key->cipher != WLAN_CIPHER_SUITE_TKIP) |
590 | return; | |
591 | ||
592 | clear_bit(key->hw_key_idx + 64, common->keymap); | |
593 | ||
594 | clear_bit(key->hw_key_idx, common->tkip_keymap); | |
595 | clear_bit(key->hw_key_idx + 64, common->tkip_keymap); | |
596 | ||
117675d0 | 597 | if (!(common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED)) { |
1bba5b73 BR |
598 | ath_hw_keyreset(common, key->hw_key_idx + 32); |
599 | clear_bit(key->hw_key_idx + 32, common->keymap); | |
600 | clear_bit(key->hw_key_idx + 64 + 32, common->keymap); | |
601 | ||
602 | clear_bit(key->hw_key_idx + 32, common->tkip_keymap); | |
603 | clear_bit(key->hw_key_idx + 64 + 32, common->tkip_keymap); | |
604 | } | |
605 | } | |
606 | EXPORT_SYMBOL(ath_key_delete); |