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                         REG_WRITE(ah, AR_KEYTABLE_TYPE(micentry),
  64                                   AR_KEYTABLE_TYPE_CLR);
  65                 }
  66
  67         }
  68
  69         return true;
  70 }
  71 EXPORT_SYMBOL(ath_hw_keyreset);
  72
  73 static bool ath_hw_keysetmac(struct ath_common *common,
  74                              u16 entry, const u8 *mac)
  75 {
  76         u32 macHi, macLo;
  77         u32 unicast_flag = AR_KEYTABLE_VALID;
  78         void *ah = common->ah;
  79
  80         if (entry >= common->keymax) {
  81                 ath_err(common, "keycache entry %u out of range\n", entry);
  82                 return false;
  83         }
  84
  85         if (mac != NULL) {
  86                 /*
  87                  * AR_KEYTABLE_VALID indicates that the address is a unicast
  88                  * address, which must match the transmitter address for
  89                  * decrypting frames.
  90                  * Not setting this bit allows the hardware to use the key
  91                  * for multicast frame decryption.
  92                  */
  93                 if (mac[0] & 0x01)
  94                         unicast_flag = 0;
  95
  96                 macHi = (mac[5] << 8) | mac[4];
  97                 macLo = (mac[3] << 24) |
  98                         (mac[2] << 16) |
  99                         (mac[1] << 8) |
 100                         mac[0];
 101                 macLo >>= 1;
 102                 macLo |= (macHi & 1) << 31;
 103                 macHi >>= 1;
 104         } else {
 105                 macLo = macHi = 0;
 106         }
 107         REG_WRITE(ah, AR_KEYTABLE_MAC0(entry), macLo);
 108         REG_WRITE(ah, AR_KEYTABLE_MAC1(entry), macHi | unicast_flag);
 109
 110         return true;
 111 }
 112
 113 static bool ath_hw_set_keycache_entry(struct ath_common *common, u16 entry,
 114                                       const struct ath_keyval *k,
 115                                       const u8 *mac)
 116 {
 117         void *ah = common->ah;
 118         u32 key0, key1, key2, key3, key4;
 119         u32 keyType;
 120
 121         if (entry >= common->keymax) {
 122                 ath_err(common, "keycache entry %u out of range\n", entry);
 123                 return false;
 124         }
 125
 126         switch (k->kv_type) {
 127         case ATH_CIPHER_AES_OCB:
 128                 keyType = AR_KEYTABLE_TYPE_AES;
 129                 break;
 130         case ATH_CIPHER_AES_CCM:
 131                 if (!(common->crypt_caps & ATH_CRYPT_CAP_CIPHER_AESCCM)) {
 132                         ath_dbg(common, ATH_DBG_ANY,
 133                                 "AES-CCM not supported by this mac rev\n");
 134                         return false;
 135                 }
 136                 keyType = AR_KEYTABLE_TYPE_CCM;
 137                 break;
 138         case ATH_CIPHER_TKIP:
 139                 keyType = AR_KEYTABLE_TYPE_TKIP;
 140                 if (entry + 64 >= common->keymax) {
 141                         ath_dbg(common, ATH_DBG_ANY,
 142                                 "entry %u inappropriate for TKIP\n", entry);
 143                         return false;
 144                 }
 145                 break;
 146         case ATH_CIPHER_WEP:
 147                 if (k->kv_len < WLAN_KEY_LEN_WEP40) {
 148                         ath_dbg(common, ATH_DBG_ANY,
 149                                 "WEP key length %u too small\n", k->kv_len);
 150                         return false;
 151                 }
 152                 if (k->kv_len <= WLAN_KEY_LEN_WEP40)
 153                         keyType = AR_KEYTABLE_TYPE_40;
 154                 else if (k->kv_len <= WLAN_KEY_LEN_WEP104)
 155                         keyType = AR_KEYTABLE_TYPE_104;
 156                 else
 157                         keyType = AR_KEYTABLE_TYPE_128;
 158                 break;
 159         case ATH_CIPHER_CLR:
 160                 keyType = AR_KEYTABLE_TYPE_CLR;
 161                 break;
 162         default:
 163                 ath_err(common, "cipher %u not supported\n", k->kv_type);
 164                 return false;
 165         }
 166
 167         key0 = get_unaligned_le32(k->kv_val + 0);
 168         key1 = get_unaligned_le16(k->kv_val + 4);
 169         key2 = get_unaligned_le32(k->kv_val + 6);
 170         key3 = get_unaligned_le16(k->kv_val + 10);
 171         key4 = get_unaligned_le32(k->kv_val + 12);
 172         if (k->kv_len <= WLAN_KEY_LEN_WEP104)
 173                 key4 &= 0xff;
 174
 175         /*
 176          * Note: Key cache registers access special memory area that requires
 177          * two 32-bit writes to actually update the values in the internal
 178          * memory. Consequently, the exact order and pairs used here must be
 179          * maintained.
 180          */
 181
 182         if (keyType == AR_KEYTABLE_TYPE_TKIP) {
 183                 u16 micentry = entry + 64;
 184
 185                 /*
 186                  * Write inverted key[47:0] first to avoid Michael MIC errors
 187                  * on frames that could be sent or received at the same time.
 188                  * The correct key will be written in the end once everything
 189                  * else is ready.
 190                  */
 191                 REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), ~key0);
 192                 REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), ~key1);
 193
 194                 /* Write key[95:48] */
 195                 REG_WRITE(ah, AR_KEYTABLE_KEY2(entry), key2);
 196                 REG_WRITE(ah, AR_KEYTABLE_KEY3(entry), key3);
 197
 198                 /* Write key[127:96] and key type */
 199                 REG_WRITE(ah, AR_KEYTABLE_KEY4(entry), key4);
 200                 REG_WRITE(ah, AR_KEYTABLE_TYPE(entry), keyType);
 201
 202                 /* Write MAC address for the entry */
 203                 (void) ath_hw_keysetmac(common, entry, mac);
 204
 205                 if (common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED) {
 206                         /*
 207                          * TKIP uses two key cache entries:
 208                          * Michael MIC TX/RX keys in the same key cache entry
 209                          * (idx = main index + 64):
 210                          * key0 [31:0] = RX key [31:0]
 211                          * key1 [15:0] = TX key [31:16]
 212                          * key1 [31:16] = reserved
 213                          * key2 [31:0] = RX key [63:32]
 214                          * key3 [15:0] = TX key [15:0]
 215                          * key3 [31:16] = reserved
 216                          * key4 [31:0] = TX key [63:32]
 217                          */
 218                         u32 mic0, mic1, mic2, mic3, mic4;
 219
 220                         mic0 = get_unaligned_le32(k->kv_mic + 0);
 221                         mic2 = get_unaligned_le32(k->kv_mic + 4);
 222                         mic1 = get_unaligned_le16(k->kv_txmic + 2) & 0xffff;
 223                         mic3 = get_unaligned_le16(k->kv_txmic + 0) & 0xffff;
 224                         mic4 = get_unaligned_le32(k->kv_txmic + 4);
 225
 226                         /* Write RX[31:0] and TX[31:16] */
 227                         REG_WRITE(ah, AR_KEYTABLE_KEY0(micentry), mic0);
 228                         REG_WRITE(ah, AR_KEYTABLE_KEY1(micentry), mic1);
 229
 230                         /* Write RX[63:32] and TX[15:0] */
 231                         REG_WRITE(ah, AR_KEYTABLE_KEY2(micentry), mic2);
 232                         REG_WRITE(ah, AR_KEYTABLE_KEY3(micentry), mic3);
 233
 234                         /* Write TX[63:32] and keyType(reserved) */
 235                         REG_WRITE(ah, AR_KEYTABLE_KEY4(micentry), mic4);
 236                         REG_WRITE(ah, AR_KEYTABLE_TYPE(micentry),
 237                                   AR_KEYTABLE_TYPE_CLR);
 238
 239                 } else {
 240                         /*
 241                          * TKIP uses four key cache entries (two for group
 242                          * keys):
 243                          * Michael MIC TX/RX keys are in different key cache
 244                          * entries (idx = main index + 64 for TX and
 245                          * main index + 32 + 96 for RX):
 246                          * key0 [31:0] = TX/RX MIC key [31:0]
 247                          * key1 [31:0] = reserved
 248                          * key2 [31:0] = TX/RX MIC key [63:32]
 249                          * key3 [31:0] = reserved
 250                          * key4 [31:0] = reserved
 251                          *
 252                          * Upper layer code will call this function separately
 253                          * for TX and RX keys when these registers offsets are
 254                          * used.
 255                          */
 256                         u32 mic0, mic2;
 257
 258                         mic0 = get_unaligned_le32(k->kv_mic + 0);
 259                         mic2 = get_unaligned_le32(k->kv_mic + 4);
 260
 261                         /* Write MIC key[31:0] */
 262                         REG_WRITE(ah, AR_KEYTABLE_KEY0(micentry), mic0);
 263                         REG_WRITE(ah, AR_KEYTABLE_KEY1(micentry), 0);
 264
 265                         /* Write MIC key[63:32] */
 266                         REG_WRITE(ah, AR_KEYTABLE_KEY2(micentry), mic2);
 267                         REG_WRITE(ah, AR_KEYTABLE_KEY3(micentry), 0);
 268
 269                         /* Write TX[63:32] and keyType(reserved) */
 270                         REG_WRITE(ah, AR_KEYTABLE_KEY4(micentry), 0);
 271                         REG_WRITE(ah, AR_KEYTABLE_TYPE(micentry),
 272                                   AR_KEYTABLE_TYPE_CLR);
 273                 }
 274
 275                 /* MAC address registers are reserved for the MIC entry */
 276                 REG_WRITE(ah, AR_KEYTABLE_MAC0(micentry), 0);
 277                 REG_WRITE(ah, AR_KEYTABLE_MAC1(micentry), 0);
 278
 279                 /*
 280                  * Write the correct (un-inverted) key[47:0] last to enable
 281                  * TKIP now that all other registers are set with correct
 282                  * values.
 283                  */
 284                 REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), key0);
 285                 REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), key1);
 286         } else {
 287                 /* Write key[47:0] */
 288                 REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), key0);
 289                 REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), key1);
 290
 291                 /* Write key[95:48] */
 292                 REG_WRITE(ah, AR_KEYTABLE_KEY2(entry), key2);
 293                 REG_WRITE(ah, AR_KEYTABLE_KEY3(entry), key3);
 294
 295                 /* Write key[127:96] and key type */
 296                 REG_WRITE(ah, AR_KEYTABLE_KEY4(entry), key4);
 297                 REG_WRITE(ah, AR_KEYTABLE_TYPE(entry), keyType);
 298
 299                 /* Write MAC address for the entry */
 300                 (void) ath_hw_keysetmac(common, entry, mac);
 301         }
 302
 303         return true;
 304 }
 305
 306 static int ath_setkey_tkip(struct ath_common *common, u16 keyix, const u8 *key,
 307                            struct ath_keyval *hk, const u8 *addr,
 308                            bool authenticator)
 309 {
 310         const u8 *key_rxmic;
 311         const u8 *key_txmic;
 312
 313         key_txmic = key + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY;
 314         key_rxmic = key + NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY;
 315
 316         if (addr == NULL) {
 317                 /*
 318                  * Group key installation - only two key cache entries are used
 319                  * regardless of splitmic capability since group key is only
 320                  * used either for TX or RX.
 321                  */
 322                 if (authenticator) {
 323                         memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic));
 324                         memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_mic));
 325                 } else {
 326                         memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
 327                         memcpy(hk->kv_txmic, key_rxmic, sizeof(hk->kv_mic));
 328                 }
 329                 return ath_hw_set_keycache_entry(common, keyix, hk, addr);
 330         }
 331         if (common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED) {
 332                 /* TX and RX keys share the same key cache entry. */
 333                 memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
 334                 memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_txmic));
 335                 return ath_hw_set_keycache_entry(common, keyix, hk, addr);
 336         }
 337
 338         /* Separate key cache entries for TX and RX */
 339
 340         /* TX key goes at first index, RX key at +32. */
 341         memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic));
 342         if (!ath_hw_set_keycache_entry(common, keyix, hk, NULL)) {
 343                 /* TX MIC entry failed. No need to proceed further */
 344                 ath_err(common, "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);