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