drivers/net/wireless/ath/key.c

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