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