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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) { | |
fedf1d80 BG |
48 | ath_err(common, "keyreset: keycache entry %u out of range\n", |
49 | entry); | |
1bba5b73 BR |
50 | return false; |
51 | } | |
52 | ||
53 | keyType = REG_READ(ah, AR_KEYTABLE_TYPE(entry)); | |
54 | ||
b0a9ede2 RM |
55 | ENABLE_REGWRITE_BUFFER(ah); |
56 | ||
1bba5b73 BR |
57 | REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), 0); |
58 | REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), 0); | |
59 | REG_WRITE(ah, AR_KEYTABLE_KEY2(entry), 0); | |
60 | REG_WRITE(ah, AR_KEYTABLE_KEY3(entry), 0); | |
61 | REG_WRITE(ah, AR_KEYTABLE_KEY4(entry), 0); | |
62 | REG_WRITE(ah, AR_KEYTABLE_TYPE(entry), AR_KEYTABLE_TYPE_CLR); | |
63 | REG_WRITE(ah, AR_KEYTABLE_MAC0(entry), 0); | |
64 | REG_WRITE(ah, AR_KEYTABLE_MAC1(entry), 0); | |
65 | ||
66 | if (keyType == AR_KEYTABLE_TYPE_TKIP) { | |
67 | u16 micentry = entry + 64; | |
68 | ||
69 | REG_WRITE(ah, AR_KEYTABLE_KEY0(micentry), 0); | |
70 | REG_WRITE(ah, AR_KEYTABLE_KEY1(micentry), 0); | |
71 | REG_WRITE(ah, AR_KEYTABLE_KEY2(micentry), 0); | |
72 | REG_WRITE(ah, AR_KEYTABLE_KEY3(micentry), 0); | |
8e546104 | 73 | if (common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED) { |
998d516d | 74 | REG_WRITE(ah, AR_KEYTABLE_KEY4(micentry), 0); |
8e546104 JM |
75 | REG_WRITE(ah, AR_KEYTABLE_TYPE(micentry), |
76 | AR_KEYTABLE_TYPE_CLR); | |
77 | } | |
1bba5b73 BR |
78 | |
79 | } | |
80 | ||
b0a9ede2 RM |
81 | REGWRITE_BUFFER_FLUSH(ah); |
82 | ||
1bba5b73 BR |
83 | return true; |
84 | } | |
85 | EXPORT_SYMBOL(ath_hw_keyreset); | |
86 | ||
a3685d11 LR |
87 | static bool ath_hw_keysetmac(struct ath_common *common, |
88 | u16 entry, const u8 *mac) | |
1bba5b73 BR |
89 | { |
90 | u32 macHi, macLo; | |
91 | u32 unicast_flag = AR_KEYTABLE_VALID; | |
92 | void *ah = common->ah; | |
93 | ||
94 | if (entry >= common->keymax) { | |
fedf1d80 BG |
95 | ath_err(common, "keysetmac: keycache entry %u out of range\n", |
96 | entry); | |
1bba5b73 BR |
97 | return false; |
98 | } | |
99 | ||
100 | if (mac != NULL) { | |
101 | /* | |
102 | * AR_KEYTABLE_VALID indicates that the address is a unicast | |
103 | * address, which must match the transmitter address for | |
104 | * decrypting frames. | |
105 | * Not setting this bit allows the hardware to use the key | |
106 | * for multicast frame decryption. | |
107 | */ | |
108 | if (mac[0] & 0x01) | |
109 | unicast_flag = 0; | |
110 | ||
d47d78df PR |
111 | macLo = get_unaligned_le32(mac); |
112 | macHi = get_unaligned_le16(mac + 4); | |
1bba5b73 BR |
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) { | |
fedf1d80 BG |
138 | ath_err(common, "set-entry: keycache entry %u out of range\n", |
139 | entry); | |
1bba5b73 BR |
140 | return false; |
141 | } | |
142 | ||
143 | switch (k->kv_type) { | |
144 | case ATH_CIPHER_AES_OCB: | |
145 | keyType = AR_KEYTABLE_TYPE_AES; | |
146 | break; | |
147 | case ATH_CIPHER_AES_CCM: | |
148 | if (!(common->crypt_caps & ATH_CRYPT_CAP_CIPHER_AESCCM)) { | |
d2182b69 | 149 | ath_dbg(common, ANY, |
226afe68 | 150 | "AES-CCM not supported by this mac rev\n"); |
1bba5b73 BR |
151 | return false; |
152 | } | |
153 | keyType = AR_KEYTABLE_TYPE_CCM; | |
154 | break; | |
155 | case ATH_CIPHER_TKIP: | |
156 | keyType = AR_KEYTABLE_TYPE_TKIP; | |
157 | if (entry + 64 >= common->keymax) { | |
d2182b69 | 158 | ath_dbg(common, ANY, |
226afe68 | 159 | "entry %u inappropriate for TKIP\n", entry); |
1bba5b73 BR |
160 | return false; |
161 | } | |
162 | break; | |
163 | case ATH_CIPHER_WEP: | |
164 | if (k->kv_len < WLAN_KEY_LEN_WEP40) { | |
d2182b69 JP |
165 | ath_dbg(common, ANY, "WEP key length %u too small\n", |
166 | k->kv_len); | |
1bba5b73 BR |
167 | return false; |
168 | } | |
169 | if (k->kv_len <= WLAN_KEY_LEN_WEP40) | |
170 | keyType = AR_KEYTABLE_TYPE_40; | |
171 | else if (k->kv_len <= WLAN_KEY_LEN_WEP104) | |
172 | keyType = AR_KEYTABLE_TYPE_104; | |
173 | else | |
174 | keyType = AR_KEYTABLE_TYPE_128; | |
175 | break; | |
176 | case ATH_CIPHER_CLR: | |
177 | keyType = AR_KEYTABLE_TYPE_CLR; | |
178 | break; | |
179 | default: | |
3800276a | 180 | ath_err(common, "cipher %u not supported\n", k->kv_type); |
1bba5b73 BR |
181 | return false; |
182 | } | |
183 | ||
184 | key0 = get_unaligned_le32(k->kv_val + 0); | |
185 | key1 = get_unaligned_le16(k->kv_val + 4); | |
186 | key2 = get_unaligned_le32(k->kv_val + 6); | |
187 | key3 = get_unaligned_le16(k->kv_val + 10); | |
188 | key4 = get_unaligned_le32(k->kv_val + 12); | |
189 | if (k->kv_len <= WLAN_KEY_LEN_WEP104) | |
190 | key4 &= 0xff; | |
191 | ||
192 | /* | |
193 | * Note: Key cache registers access special memory area that requires | |
194 | * two 32-bit writes to actually update the values in the internal | |
195 | * memory. Consequently, the exact order and pairs used here must be | |
196 | * maintained. | |
197 | */ | |
198 | ||
199 | if (keyType == AR_KEYTABLE_TYPE_TKIP) { | |
200 | u16 micentry = entry + 64; | |
201 | ||
202 | /* | |
203 | * Write inverted key[47:0] first to avoid Michael MIC errors | |
204 | * on frames that could be sent or received at the same time. | |
205 | * The correct key will be written in the end once everything | |
206 | * else is ready. | |
207 | */ | |
208 | REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), ~key0); | |
209 | REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), ~key1); | |
210 | ||
211 | /* Write key[95:48] */ | |
212 | REG_WRITE(ah, AR_KEYTABLE_KEY2(entry), key2); | |
213 | REG_WRITE(ah, AR_KEYTABLE_KEY3(entry), key3); | |
214 | ||
215 | /* Write key[127:96] and key type */ | |
216 | REG_WRITE(ah, AR_KEYTABLE_KEY4(entry), key4); | |
217 | REG_WRITE(ah, AR_KEYTABLE_TYPE(entry), keyType); | |
218 | ||
219 | /* Write MAC address for the entry */ | |
220 | (void) ath_hw_keysetmac(common, entry, mac); | |
221 | ||
117675d0 | 222 | if (common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED) { |
1bba5b73 BR |
223 | /* |
224 | * TKIP uses two key cache entries: | |
225 | * Michael MIC TX/RX keys in the same key cache entry | |
226 | * (idx = main index + 64): | |
227 | * key0 [31:0] = RX key [31:0] | |
228 | * key1 [15:0] = TX key [31:16] | |
229 | * key1 [31:16] = reserved | |
230 | * key2 [31:0] = RX key [63:32] | |
231 | * key3 [15:0] = TX key [15:0] | |
232 | * key3 [31:16] = reserved | |
233 | * key4 [31:0] = TX key [63:32] | |
234 | */ | |
235 | u32 mic0, mic1, mic2, mic3, mic4; | |
236 | ||
237 | mic0 = get_unaligned_le32(k->kv_mic + 0); | |
238 | mic2 = get_unaligned_le32(k->kv_mic + 4); | |
239 | mic1 = get_unaligned_le16(k->kv_txmic + 2) & 0xffff; | |
240 | mic3 = get_unaligned_le16(k->kv_txmic + 0) & 0xffff; | |
241 | mic4 = get_unaligned_le32(k->kv_txmic + 4); | |
242 | ||
b0a9ede2 RM |
243 | ENABLE_REGWRITE_BUFFER(ah); |
244 | ||
1bba5b73 BR |
245 | /* Write RX[31:0] and TX[31:16] */ |
246 | REG_WRITE(ah, AR_KEYTABLE_KEY0(micentry), mic0); | |
247 | REG_WRITE(ah, AR_KEYTABLE_KEY1(micentry), mic1); | |
248 | ||
249 | /* Write RX[63:32] and TX[15:0] */ | |
250 | REG_WRITE(ah, AR_KEYTABLE_KEY2(micentry), mic2); | |
251 | REG_WRITE(ah, AR_KEYTABLE_KEY3(micentry), mic3); | |
252 | ||
253 | /* Write TX[63:32] and keyType(reserved) */ | |
254 | REG_WRITE(ah, AR_KEYTABLE_KEY4(micentry), mic4); | |
255 | REG_WRITE(ah, AR_KEYTABLE_TYPE(micentry), | |
256 | AR_KEYTABLE_TYPE_CLR); | |
257 | ||
b0a9ede2 RM |
258 | REGWRITE_BUFFER_FLUSH(ah); |
259 | ||
1bba5b73 BR |
260 | } else { |
261 | /* | |
262 | * TKIP uses four key cache entries (two for group | |
263 | * keys): | |
264 | * Michael MIC TX/RX keys are in different key cache | |
265 | * entries (idx = main index + 64 for TX and | |
266 | * main index + 32 + 96 for RX): | |
267 | * key0 [31:0] = TX/RX MIC key [31:0] | |
268 | * key1 [31:0] = reserved | |
269 | * key2 [31:0] = TX/RX MIC key [63:32] | |
270 | * key3 [31:0] = reserved | |
271 | * key4 [31:0] = reserved | |
272 | * | |
273 | * Upper layer code will call this function separately | |
274 | * for TX and RX keys when these registers offsets are | |
275 | * used. | |
276 | */ | |
277 | u32 mic0, mic2; | |
278 | ||
279 | mic0 = get_unaligned_le32(k->kv_mic + 0); | |
280 | mic2 = get_unaligned_le32(k->kv_mic + 4); | |
281 | ||
b0a9ede2 RM |
282 | ENABLE_REGWRITE_BUFFER(ah); |
283 | ||
1bba5b73 BR |
284 | /* Write MIC key[31:0] */ |
285 | REG_WRITE(ah, AR_KEYTABLE_KEY0(micentry), mic0); | |
286 | REG_WRITE(ah, AR_KEYTABLE_KEY1(micentry), 0); | |
287 | ||
288 | /* Write MIC key[63:32] */ | |
289 | REG_WRITE(ah, AR_KEYTABLE_KEY2(micentry), mic2); | |
290 | REG_WRITE(ah, AR_KEYTABLE_KEY3(micentry), 0); | |
291 | ||
292 | /* Write TX[63:32] and keyType(reserved) */ | |
293 | REG_WRITE(ah, AR_KEYTABLE_KEY4(micentry), 0); | |
294 | REG_WRITE(ah, AR_KEYTABLE_TYPE(micentry), | |
295 | AR_KEYTABLE_TYPE_CLR); | |
b0a9ede2 RM |
296 | |
297 | REGWRITE_BUFFER_FLUSH(ah); | |
1bba5b73 BR |
298 | } |
299 | ||
b0a9ede2 RM |
300 | ENABLE_REGWRITE_BUFFER(ah); |
301 | ||
1bba5b73 BR |
302 | /* MAC address registers are reserved for the MIC entry */ |
303 | REG_WRITE(ah, AR_KEYTABLE_MAC0(micentry), 0); | |
304 | REG_WRITE(ah, AR_KEYTABLE_MAC1(micentry), 0); | |
305 | ||
306 | /* | |
307 | * Write the correct (un-inverted) key[47:0] last to enable | |
308 | * TKIP now that all other registers are set with correct | |
309 | * values. | |
310 | */ | |
311 | REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), key0); | |
312 | REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), key1); | |
b0a9ede2 RM |
313 | |
314 | REGWRITE_BUFFER_FLUSH(ah); | |
1bba5b73 | 315 | } else { |
b0a9ede2 RM |
316 | ENABLE_REGWRITE_BUFFER(ah); |
317 | ||
1bba5b73 BR |
318 | /* Write key[47:0] */ |
319 | REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), key0); | |
320 | REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), key1); | |
321 | ||
322 | /* Write key[95:48] */ | |
323 | REG_WRITE(ah, AR_KEYTABLE_KEY2(entry), key2); | |
324 | REG_WRITE(ah, AR_KEYTABLE_KEY3(entry), key3); | |
325 | ||
326 | /* Write key[127:96] and key type */ | |
327 | REG_WRITE(ah, AR_KEYTABLE_KEY4(entry), key4); | |
328 | REG_WRITE(ah, AR_KEYTABLE_TYPE(entry), keyType); | |
329 | ||
b0a9ede2 RM |
330 | REGWRITE_BUFFER_FLUSH(ah); |
331 | ||
1bba5b73 BR |
332 | /* Write MAC address for the entry */ |
333 | (void) ath_hw_keysetmac(common, entry, mac); | |
334 | } | |
335 | ||
336 | return true; | |
337 | } | |
338 | ||
339 | static int ath_setkey_tkip(struct ath_common *common, u16 keyix, const u8 *key, | |
340 | struct ath_keyval *hk, const u8 *addr, | |
341 | bool authenticator) | |
342 | { | |
343 | const u8 *key_rxmic; | |
344 | const u8 *key_txmic; | |
345 | ||
346 | key_txmic = key + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY; | |
347 | key_rxmic = key + NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY; | |
348 | ||
349 | if (addr == NULL) { | |
350 | /* | |
351 | * Group key installation - only two key cache entries are used | |
352 | * regardless of splitmic capability since group key is only | |
353 | * used either for TX or RX. | |
354 | */ | |
355 | if (authenticator) { | |
356 | memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic)); | |
357 | memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_mic)); | |
358 | } else { | |
359 | memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic)); | |
360 | memcpy(hk->kv_txmic, key_rxmic, sizeof(hk->kv_mic)); | |
361 | } | |
362 | return ath_hw_set_keycache_entry(common, keyix, hk, addr); | |
363 | } | |
117675d0 | 364 | if (common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED) { |
1bba5b73 BR |
365 | /* TX and RX keys share the same key cache entry. */ |
366 | memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic)); | |
367 | memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_txmic)); | |
368 | return ath_hw_set_keycache_entry(common, keyix, hk, addr); | |
369 | } | |
370 | ||
371 | /* Separate key cache entries for TX and RX */ | |
372 | ||
373 | /* TX key goes at first index, RX key at +32. */ | |
374 | memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic)); | |
375 | if (!ath_hw_set_keycache_entry(common, keyix, hk, NULL)) { | |
376 | /* TX MIC entry failed. No need to proceed further */ | |
3800276a | 377 | ath_err(common, "Setting TX MIC Key Failed\n"); |
1bba5b73 BR |
378 | return 0; |
379 | } | |
380 | ||
381 | memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic)); | |
382 | /* XXX delete tx key on failure? */ | |
383 | return ath_hw_set_keycache_entry(common, keyix + 32, hk, addr); | |
384 | } | |
385 | ||
386 | static int ath_reserve_key_cache_slot_tkip(struct ath_common *common) | |
387 | { | |
388 | int i; | |
389 | ||
390 | for (i = IEEE80211_WEP_NKID; i < common->keymax / 2; i++) { | |
391 | if (test_bit(i, common->keymap) || | |
392 | test_bit(i + 64, common->keymap)) | |
393 | continue; /* At least one part of TKIP key allocated */ | |
117675d0 | 394 | if (!(common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED) && |
1bba5b73 BR |
395 | (test_bit(i + 32, common->keymap) || |
396 | test_bit(i + 64 + 32, common->keymap))) | |
397 | continue; /* At least one part of TKIP key allocated */ | |
398 | ||
399 | /* Found a free slot for a TKIP key */ | |
400 | return i; | |
401 | } | |
402 | return -1; | |
403 | } | |
404 | ||
405 | static int ath_reserve_key_cache_slot(struct ath_common *common, | |
406 | u32 cipher) | |
407 | { | |
408 | int i; | |
409 | ||
410 | if (cipher == WLAN_CIPHER_SUITE_TKIP) | |
411 | return ath_reserve_key_cache_slot_tkip(common); | |
412 | ||
413 | /* First, try to find slots that would not be available for TKIP. */ | |
117675d0 | 414 | if (!(common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED)) { |
1bba5b73 BR |
415 | for (i = IEEE80211_WEP_NKID; i < common->keymax / 4; i++) { |
416 | if (!test_bit(i, common->keymap) && | |
417 | (test_bit(i + 32, common->keymap) || | |
418 | test_bit(i + 64, common->keymap) || | |
419 | test_bit(i + 64 + 32, common->keymap))) | |
420 | return i; | |
421 | if (!test_bit(i + 32, common->keymap) && | |
422 | (test_bit(i, common->keymap) || | |
423 | test_bit(i + 64, common->keymap) || | |
424 | test_bit(i + 64 + 32, common->keymap))) | |
425 | return i + 32; | |
426 | if (!test_bit(i + 64, common->keymap) && | |
427 | (test_bit(i , common->keymap) || | |
428 | test_bit(i + 32, common->keymap) || | |
429 | test_bit(i + 64 + 32, common->keymap))) | |
430 | return i + 64; | |
431 | if (!test_bit(i + 64 + 32, common->keymap) && | |
432 | (test_bit(i, common->keymap) || | |
433 | test_bit(i + 32, common->keymap) || | |
434 | test_bit(i + 64, common->keymap))) | |
435 | return i + 64 + 32; | |
436 | } | |
437 | } else { | |
438 | for (i = IEEE80211_WEP_NKID; i < common->keymax / 2; i++) { | |
439 | if (!test_bit(i, common->keymap) && | |
440 | test_bit(i + 64, common->keymap)) | |
441 | return i; | |
442 | if (test_bit(i, common->keymap) && | |
443 | !test_bit(i + 64, common->keymap)) | |
444 | return i + 64; | |
445 | } | |
446 | } | |
447 | ||
448 | /* No partially used TKIP slots, pick any available slot */ | |
449 | for (i = IEEE80211_WEP_NKID; i < common->keymax; i++) { | |
450 | /* Do not allow slots that could be needed for TKIP group keys | |
451 | * to be used. This limitation could be removed if we know that | |
452 | * TKIP will not be used. */ | |
453 | if (i >= 64 && i < 64 + IEEE80211_WEP_NKID) | |
454 | continue; | |
117675d0 | 455 | if (!(common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED)) { |
1bba5b73 BR |
456 | if (i >= 32 && i < 32 + IEEE80211_WEP_NKID) |
457 | continue; | |
458 | if (i >= 64 + 32 && i < 64 + 32 + IEEE80211_WEP_NKID) | |
459 | continue; | |
460 | } | |
461 | ||
462 | if (!test_bit(i, common->keymap)) | |
463 | return i; /* Found a free slot for a key */ | |
464 | } | |
465 | ||
466 | /* No free slot found */ | |
467 | return -1; | |
468 | } | |
469 | ||
470 | /* | |
471 | * Configure encryption in the HW. | |
472 | */ | |
473 | int ath_key_config(struct ath_common *common, | |
474 | struct ieee80211_vif *vif, | |
475 | struct ieee80211_sta *sta, | |
476 | struct ieee80211_key_conf *key) | |
477 | { | |
478 | struct ath_keyval hk; | |
479 | const u8 *mac = NULL; | |
480 | u8 gmac[ETH_ALEN]; | |
481 | int ret = 0; | |
482 | int idx; | |
483 | ||
484 | memset(&hk, 0, sizeof(hk)); | |
485 | ||
486 | switch (key->cipher) { | |
93ae2dd2 FF |
487 | case 0: |
488 | hk.kv_type = ATH_CIPHER_CLR; | |
489 | break; | |
1bba5b73 BR |
490 | case WLAN_CIPHER_SUITE_WEP40: |
491 | case WLAN_CIPHER_SUITE_WEP104: | |
492 | hk.kv_type = ATH_CIPHER_WEP; | |
493 | break; | |
494 | case WLAN_CIPHER_SUITE_TKIP: | |
495 | hk.kv_type = ATH_CIPHER_TKIP; | |
496 | break; | |
497 | case WLAN_CIPHER_SUITE_CCMP: | |
498 | hk.kv_type = ATH_CIPHER_AES_CCM; | |
499 | break; | |
500 | default: | |
501 | return -EOPNOTSUPP; | |
502 | } | |
503 | ||
504 | hk.kv_len = key->keylen; | |
93ae2dd2 FF |
505 | if (key->keylen) |
506 | memcpy(hk.kv_val, key->key, key->keylen); | |
1bba5b73 BR |
507 | |
508 | if (!(key->flags & IEEE80211_KEY_FLAG_PAIRWISE)) { | |
509 | switch (vif->type) { | |
510 | case NL80211_IFTYPE_AP: | |
511 | memcpy(gmac, vif->addr, ETH_ALEN); | |
512 | gmac[0] |= 0x01; | |
513 | mac = gmac; | |
514 | idx = ath_reserve_key_cache_slot(common, key->cipher); | |
515 | break; | |
516 | case NL80211_IFTYPE_ADHOC: | |
517 | if (!sta) { | |
518 | idx = key->keyidx; | |
519 | break; | |
520 | } | |
521 | memcpy(gmac, sta->addr, ETH_ALEN); | |
522 | gmac[0] |= 0x01; | |
523 | mac = gmac; | |
524 | idx = ath_reserve_key_cache_slot(common, key->cipher); | |
525 | break; | |
526 | default: | |
527 | idx = key->keyidx; | |
528 | break; | |
529 | } | |
530 | } else if (key->keyidx) { | |
531 | if (WARN_ON(!sta)) | |
532 | return -EOPNOTSUPP; | |
533 | mac = sta->addr; | |
534 | ||
535 | if (vif->type != NL80211_IFTYPE_AP) { | |
536 | /* Only keyidx 0 should be used with unicast key, but | |
537 | * allow this for client mode for now. */ | |
538 | idx = key->keyidx; | |
539 | } else | |
540 | return -EIO; | |
541 | } else { | |
542 | if (WARN_ON(!sta)) | |
543 | return -EOPNOTSUPP; | |
544 | mac = sta->addr; | |
545 | ||
546 | idx = ath_reserve_key_cache_slot(common, key->cipher); | |
547 | } | |
548 | ||
549 | if (idx < 0) | |
550 | return -ENOSPC; /* no free key cache entries */ | |
551 | ||
552 | if (key->cipher == WLAN_CIPHER_SUITE_TKIP) | |
553 | ret = ath_setkey_tkip(common, idx, key->key, &hk, mac, | |
554 | vif->type == NL80211_IFTYPE_AP); | |
555 | else | |
556 | ret = ath_hw_set_keycache_entry(common, idx, &hk, mac); | |
557 | ||
558 | if (!ret) | |
559 | return -EIO; | |
560 | ||
561 | set_bit(idx, common->keymap); | |
bed3d9c0 FF |
562 | if (key->cipher == WLAN_CIPHER_SUITE_CCMP) |
563 | set_bit(idx, common->ccmp_keymap); | |
564 | ||
1bba5b73 BR |
565 | if (key->cipher == WLAN_CIPHER_SUITE_TKIP) { |
566 | set_bit(idx + 64, common->keymap); | |
567 | set_bit(idx, common->tkip_keymap); | |
568 | set_bit(idx + 64, common->tkip_keymap); | |
117675d0 | 569 | if (!(common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED)) { |
1bba5b73 BR |
570 | set_bit(idx + 32, common->keymap); |
571 | set_bit(idx + 64 + 32, common->keymap); | |
572 | set_bit(idx + 32, common->tkip_keymap); | |
573 | set_bit(idx + 64 + 32, common->tkip_keymap); | |
574 | } | |
575 | } | |
576 | ||
577 | return idx; | |
578 | } | |
579 | EXPORT_SYMBOL(ath_key_config); | |
580 | ||
581 | /* | |
582 | * Delete Key. | |
583 | */ | |
584 | void ath_key_delete(struct ath_common *common, struct ieee80211_key_conf *key) | |
585 | { | |
586 | ath_hw_keyreset(common, key->hw_key_idx); | |
587 | if (key->hw_key_idx < IEEE80211_WEP_NKID) | |
588 | return; | |
589 | ||
590 | clear_bit(key->hw_key_idx, common->keymap); | |
bed3d9c0 | 591 | clear_bit(key->hw_key_idx, common->ccmp_keymap); |
1bba5b73 BR |
592 | if (key->cipher != WLAN_CIPHER_SUITE_TKIP) |
593 | return; | |
594 | ||
595 | clear_bit(key->hw_key_idx + 64, common->keymap); | |
596 | ||
597 | clear_bit(key->hw_key_idx, common->tkip_keymap); | |
598 | clear_bit(key->hw_key_idx + 64, common->tkip_keymap); | |
599 | ||
117675d0 | 600 | if (!(common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED)) { |
1bba5b73 BR |
601 | ath_hw_keyreset(common, key->hw_key_idx + 32); |
602 | clear_bit(key->hw_key_idx + 32, common->keymap); | |
603 | clear_bit(key->hw_key_idx + 64 + 32, common->keymap); | |
604 | ||
605 | clear_bit(key->hw_key_idx + 32, common->tkip_keymap); | |
606 | clear_bit(key->hw_key_idx + 64 + 32, common->tkip_keymap); | |
607 | } | |
608 | } | |
609 | EXPORT_SYMBOL(ath_key_delete); |