net/mac80211/key.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2007-2008  Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/if_ether.h>
  14 #include <linux/etherdevice.h>
  15 #include <linux/list.h>
  16 #include <linux/rcupdate.h>
  17 #include <linux/rtnetlink.h>
  18 #include <linux/slab.h>
  19 #include <linux/export.h>
  20 #include <net/mac80211.h>
  21 #include <asm/unaligned.h>
  22 #include "ieee80211_i.h"
  23 #include "driver-ops.h"
  24 #include "debugfs_key.h"
  25 #include "aes_ccm.h"
  26 #include "aes_cmac.h"
  27 #include "aes_gmac.h"
  28 #include "aes_gcm.h"
  29
  30
  31 /**
  32  * DOC: Key handling basics
  33  *
  34  * Key handling in mac80211 is done based on per-interface (sub_if_data)
  35  * keys and per-station keys. Since each station belongs to an interface,
  36  * each station key also belongs to that interface.
  37  *
  38  * Hardware acceleration is done on a best-effort basis for algorithms
  39  * that are implemented in software,  for each key the hardware is asked
  40  * to enable that key for offloading but if it cannot do that the key is
  41  * simply kept for software encryption (unless it is for an algorithm
  42  * that isn't implemented in software).
  43  * There is currently no way of knowing whether a key is handled in SW
  44  * or HW except by looking into debugfs.
  45  *
  46  * All key management is internally protected by a mutex. Within all
  47  * other parts of mac80211, key references are, just as STA structure
  48  * references, protected by RCU. Note, however, that some things are
  49  * unprotected, namely the key->sta dereferences within the hardware
  50  * acceleration functions. This means that sta_info_destroy() must
  51  * remove the key which waits for an RCU grace period.
  52  */
  53
  54 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
  55
  56 static void assert_key_lock(struct ieee80211_local *local)
  57 {
  58         lockdep_assert_held(&local->key_mtx);
  59 }
  60
  61 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
  62 {
  63         /*
  64          * When this count is zero, SKB resizing for allocating tailroom
  65          * for IV or MMIC is skipped. But, this check has created two race
  66          * cases in xmit path while transiting from zero count to one:
  67          *
  68          * 1. SKB resize was skipped because no key was added but just before
  69          * the xmit key is added and SW encryption kicks off.
  70          *
  71          * 2. SKB resize was skipped because all the keys were hw planted but
  72          * just before xmit one of the key is deleted and SW encryption kicks
  73          * off.
  74          *
  75          * In both the above case SW encryption will find not enough space for
  76          * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
  77          *
  78          * Solution has been explained at
  79          * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
  80          */
  81
  82         if (!sdata->crypto_tx_tailroom_needed_cnt++) {
  83                 /*
  84                  * Flush all XMIT packets currently using HW encryption or no
  85                  * encryption at all if the count transition is from 0 -> 1.
  86                  */
  87                 synchronize_net();
  88         }
  89 }
  90
  91 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
  92 {
  93         struct ieee80211_sub_if_data *sdata;
  94         struct sta_info *sta;
  95         int ret = -EOPNOTSUPP;
  96
  97         might_sleep();
  98
  99         if (key->flags & KEY_FLAG_TAINTED) {
 100                 /* If we get here, it's during resume and the key is
 101                  * tainted so shouldn't be used/programmed any more.
 102                  * However, its flags may still indicate that it was
 103                  * programmed into the device (since we're in resume)
 104                  * so clear that flag now to avoid trying to remove
 105                  * it again later.
 106                  */
 107                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 108                 return -EINVAL;
 109         }
 110
 111         if (!key->local->ops->set_key)
 112                 goto out_unsupported;
 113
 114         assert_key_lock(key->local);
 115
 116         sta = key->sta;
 117
 118         /*
 119          * If this is a per-STA GTK, check if it
 120          * is supported; if not, return.
 121          */
 122         if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) &&
 123             !(key->local->hw.flags & IEEE80211_HW_SUPPORTS_PER_STA_GTK))
 124                 goto out_unsupported;
 125
 126         if (sta && !sta->uploaded)
 127                 goto out_unsupported;
 128
 129         sdata = key->sdata;
 130         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 131                 /*
 132                  * The driver doesn't know anything about VLAN interfaces.
 133                  * Hence, don't send GTKs for VLAN interfaces to the driver.
 134                  */
 135                 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE))
 136                         goto out_unsupported;
 137         }
 138
 139         ret = drv_set_key(key->local, SET_KEY, sdata,
 140                           sta ? &sta->sta : NULL, &key->conf);
 141
 142         if (!ret) {
 143                 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
 144
 145                 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
 146                       (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 147                         sdata->crypto_tx_tailroom_needed_cnt--;
 148
 149                 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
 150                         (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
 151
 152                 return 0;
 153         }
 154
 155         if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1)
 156                 sdata_err(sdata,
 157                           "failed to set key (%d, %pM) to hardware (%d)\n",
 158                           key->conf.keyidx,
 159                           sta ? sta->sta.addr : bcast_addr, ret);
 160
 161  out_unsupported:
 162         switch (key->conf.cipher) {
 163         case WLAN_CIPHER_SUITE_WEP40:
 164         case WLAN_CIPHER_SUITE_WEP104:
 165         case WLAN_CIPHER_SUITE_TKIP:
 166         case WLAN_CIPHER_SUITE_CCMP:
 167         case WLAN_CIPHER_SUITE_CCMP_256:
 168         case WLAN_CIPHER_SUITE_AES_CMAC:
 169         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 170         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 171         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 172         case WLAN_CIPHER_SUITE_GCMP:
 173         case WLAN_CIPHER_SUITE_GCMP_256:
 174                 /* all of these we can do in software - if driver can */
 175                 if (ret == 1)
 176                         return 0;
 177                 if (key->local->hw.flags & IEEE80211_HW_SW_CRYPTO_CONTROL)
 178                         return -EINVAL;
 179                 return 0;
 180         default:
 181                 return -EINVAL;
 182         }
 183 }
 184
 185 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
 186 {
 187         struct ieee80211_sub_if_data *sdata;
 188         struct sta_info *sta;
 189         int ret;
 190
 191         might_sleep();
 192
 193         if (!key || !key->local->ops->set_key)
 194                 return;
 195
 196         assert_key_lock(key->local);
 197
 198         if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 199                 return;
 200
 201         sta = key->sta;
 202         sdata = key->sdata;
 203
 204         if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
 205               (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 206                 increment_tailroom_need_count(sdata);
 207
 208         ret = drv_set_key(key->local, DISABLE_KEY, sdata,
 209                           sta ? &sta->sta : NULL, &key->conf);
 210
 211         if (ret)
 212                 sdata_err(sdata,
 213                           "failed to remove key (%d, %pM) from hardware (%d)\n",
 214                           key->conf.keyidx,
 215                           sta ? sta->sta.addr : bcast_addr, ret);
 216
 217         key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 218 }
 219
 220 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
 221                                         int idx, bool uni, bool multi)
 222 {
 223         struct ieee80211_key *key = NULL;
 224
 225         assert_key_lock(sdata->local);
 226
 227         if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
 228                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 229
 230         if (uni) {
 231                 rcu_assign_pointer(sdata->default_unicast_key, key);
 232                 drv_set_default_unicast_key(sdata->local, sdata, idx);
 233         }
 234
 235         if (multi)
 236                 rcu_assign_pointer(sdata->default_multicast_key, key);
 237
 238         ieee80211_debugfs_key_update_default(sdata);
 239 }
 240
 241 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
 242                                bool uni, bool multi)
 243 {
 244         mutex_lock(&sdata->local->key_mtx);
 245         __ieee80211_set_default_key(sdata, idx, uni, multi);
 246         mutex_unlock(&sdata->local->key_mtx);
 247 }
 248
 249 static void
 250 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
 251 {
 252         struct ieee80211_key *key = NULL;
 253
 254         assert_key_lock(sdata->local);
 255
 256         if (idx >= NUM_DEFAULT_KEYS &&
 257             idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
 258                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 259
 260         rcu_assign_pointer(sdata->default_mgmt_key, key);
 261
 262         ieee80211_debugfs_key_update_default(sdata);
 263 }
 264
 265 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
 266                                     int idx)
 267 {
 268         mutex_lock(&sdata->local->key_mtx);
 269         __ieee80211_set_default_mgmt_key(sdata, idx);
 270         mutex_unlock(&sdata->local->key_mtx);
 271 }
 272
 273
 274 static void ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
 275                                   struct sta_info *sta,
 276                                   bool pairwise,
 277                                   struct ieee80211_key *old,
 278                                   struct ieee80211_key *new)
 279 {
 280         int idx;
 281         bool defunikey, defmultikey, defmgmtkey;
 282
 283         /* caller must provide at least one old/new */
 284         if (WARN_ON(!new && !old))
 285                 return;
 286
 287         if (new)
 288                 list_add_tail(&new->list, &sdata->key_list);
 289
 290         WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
 291
 292         if (old)
 293                 idx = old->conf.keyidx;
 294         else
 295                 idx = new->conf.keyidx;
 296
 297         if (sta) {
 298                 if (pairwise) {
 299                         rcu_assign_pointer(sta->ptk[idx], new);
 300                         sta->ptk_idx = idx;
 301                 } else {
 302                         rcu_assign_pointer(sta->gtk[idx], new);
 303                         sta->gtk_idx = idx;
 304                 }
 305         } else {
 306                 defunikey = old &&
 307                         old == key_mtx_dereference(sdata->local,
 308                                                 sdata->default_unicast_key);
 309                 defmultikey = old &&
 310                         old == key_mtx_dereference(sdata->local,
 311                                                 sdata->default_multicast_key);
 312                 defmgmtkey = old &&
 313                         old == key_mtx_dereference(sdata->local,
 314                                                 sdata->default_mgmt_key);
 315
 316                 if (defunikey && !new)
 317                         __ieee80211_set_default_key(sdata, -1, true, false);
 318                 if (defmultikey && !new)
 319                         __ieee80211_set_default_key(sdata, -1, false, true);
 320                 if (defmgmtkey && !new)
 321                         __ieee80211_set_default_mgmt_key(sdata, -1);
 322
 323                 rcu_assign_pointer(sdata->keys[idx], new);
 324                 if (defunikey && new)
 325                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 326                                                     true, false);
 327                 if (defmultikey && new)
 328                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 329                                                     false, true);
 330                 if (defmgmtkey && new)
 331                         __ieee80211_set_default_mgmt_key(sdata,
 332                                                          new->conf.keyidx);
 333         }
 334
 335         if (old)
 336                 list_del(&old->list);
 337 }
 338
 339 struct ieee80211_key *
 340 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
 341                     const u8 *key_data,
 342                     size_t seq_len, const u8 *seq,
 343                     const struct ieee80211_cipher_scheme *cs)
 344 {
 345         struct ieee80211_key *key;
 346         int i, j, err;
 347
 348         if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS))
 349                 return ERR_PTR(-EINVAL);
 350
 351         key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
 352         if (!key)
 353                 return ERR_PTR(-ENOMEM);
 354
 355         /*
 356          * Default to software encryption; we'll later upload the
 357          * key to the hardware if possible.
 358          */
 359         key->conf.flags = 0;
 360         key->flags = 0;
 361
 362         key->conf.cipher = cipher;
 363         key->conf.keyidx = idx;
 364         key->conf.keylen = key_len;
 365         switch (cipher) {
 366         case WLAN_CIPHER_SUITE_WEP40:
 367         case WLAN_CIPHER_SUITE_WEP104:
 368                 key->conf.iv_len = IEEE80211_WEP_IV_LEN;
 369                 key->conf.icv_len = IEEE80211_WEP_ICV_LEN;
 370                 break;
 371         case WLAN_CIPHER_SUITE_TKIP:
 372                 key->conf.iv_len = IEEE80211_TKIP_IV_LEN;
 373                 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN;
 374                 if (seq) {
 375                         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
 376                                 key->u.tkip.rx[i].iv32 =
 377                                         get_unaligned_le32(&seq[2]);
 378                                 key->u.tkip.rx[i].iv16 =
 379                                         get_unaligned_le16(seq);
 380                         }
 381                 }
 382                 spin_lock_init(&key->u.tkip.txlock);
 383                 break;
 384         case WLAN_CIPHER_SUITE_CCMP:
 385                 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN;
 386                 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN;
 387                 if (seq) {
 388                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 389                                 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++)
 390                                         key->u.ccmp.rx_pn[i][j] =
 391                                                 seq[IEEE80211_CCMP_PN_LEN - j - 1];
 392                 }
 393                 /*
 394                  * Initialize AES key state here as an optimization so that
 395                  * it does not need to be initialized for every packet.
 396                  */
 397                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 398                         key_data, key_len, IEEE80211_CCMP_MIC_LEN);
 399                 if (IS_ERR(key->u.ccmp.tfm)) {
 400                         err = PTR_ERR(key->u.ccmp.tfm);
 401                         kfree(key);
 402                         return ERR_PTR(err);
 403                 }
 404                 break;
 405         case WLAN_CIPHER_SUITE_CCMP_256:
 406                 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN;
 407                 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN;
 408                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 409                         for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++)
 410                                 key->u.ccmp.rx_pn[i][j] =
 411                                         seq[IEEE80211_CCMP_256_PN_LEN - j - 1];
 412                 /* Initialize AES key state here as an optimization so that
 413                  * it does not need to be initialized for every packet.
 414                  */
 415                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 416                         key_data, key_len, IEEE80211_CCMP_256_MIC_LEN);
 417                 if (IS_ERR(key->u.ccmp.tfm)) {
 418                         err = PTR_ERR(key->u.ccmp.tfm);
 419                         kfree(key);
 420                         return ERR_PTR(err);
 421                 }
 422                 break;
 423         case WLAN_CIPHER_SUITE_AES_CMAC:
 424         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 425                 key->conf.iv_len = 0;
 426                 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
 427                         key->conf.icv_len = sizeof(struct ieee80211_mmie);
 428                 else
 429                         key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 430                 if (seq)
 431                         for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
 432                                 key->u.aes_cmac.rx_pn[j] =
 433                                         seq[IEEE80211_CMAC_PN_LEN - j - 1];
 434                 /*
 435                  * Initialize AES key state here as an optimization so that
 436                  * it does not need to be initialized for every packet.
 437                  */
 438                 key->u.aes_cmac.tfm =
 439                         ieee80211_aes_cmac_key_setup(key_data, key_len);
 440                 if (IS_ERR(key->u.aes_cmac.tfm)) {
 441                         err = PTR_ERR(key->u.aes_cmac.tfm);
 442                         kfree(key);
 443                         return ERR_PTR(err);
 444                 }
 445                 break;
 446         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 447         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 448                 key->conf.iv_len = 0;
 449                 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 450                 if (seq)
 451                         for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++)
 452                                 key->u.aes_gmac.rx_pn[j] =
 453                                         seq[IEEE80211_GMAC_PN_LEN - j - 1];
 454                 /* Initialize AES key state here as an optimization so that
 455                  * it does not need to be initialized for every packet.
 456                  */
 457                 key->u.aes_gmac.tfm =
 458                         ieee80211_aes_gmac_key_setup(key_data, key_len);
 459                 if (IS_ERR(key->u.aes_gmac.tfm)) {
 460                         err = PTR_ERR(key->u.aes_gmac.tfm);
 461                         kfree(key);
 462                         return ERR_PTR(err);
 463                 }
 464                 break;
 465         case WLAN_CIPHER_SUITE_GCMP:
 466         case WLAN_CIPHER_SUITE_GCMP_256:
 467                 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
 468                 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
 469                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 470                         for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
 471                                 key->u.gcmp.rx_pn[i][j] =
 472                                         seq[IEEE80211_GCMP_PN_LEN - j - 1];
 473                 /* Initialize AES key state here as an optimization so that
 474                  * it does not need to be initialized for every packet.
 475                  */
 476                 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
 477                                                                       key_len);
 478                 if (IS_ERR(key->u.gcmp.tfm)) {
 479                         err = PTR_ERR(key->u.gcmp.tfm);
 480                         kfree(key);
 481                         return ERR_PTR(err);
 482                 }
 483                 break;
 484         default:
 485                 if (cs) {
 486                         size_t len = (seq_len > MAX_PN_LEN) ?
 487                                                 MAX_PN_LEN : seq_len;
 488
 489                         key->conf.iv_len = cs->hdr_len;
 490                         key->conf.icv_len = cs->mic_len;
 491                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 492                                 for (j = 0; j < len; j++)
 493                                         key->u.gen.rx_pn[i][j] =
 494                                                         seq[len - j - 1];
 495                         key->flags |= KEY_FLAG_CIPHER_SCHEME;
 496                 }
 497         }
 498         memcpy(key->conf.key, key_data, key_len);
 499         INIT_LIST_HEAD(&key->list);
 500
 501         return key;
 502 }
 503
 504 static void ieee80211_key_free_common(struct ieee80211_key *key)
 505 {
 506         switch (key->conf.cipher) {
 507         case WLAN_CIPHER_SUITE_CCMP:
 508         case WLAN_CIPHER_SUITE_CCMP_256:
 509                 ieee80211_aes_key_free(key->u.ccmp.tfm);
 510                 break;
 511         case WLAN_CIPHER_SUITE_AES_CMAC:
 512         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 513                 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
 514                 break;
 515         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 516         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 517                 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm);
 518                 break;
 519         case WLAN_CIPHER_SUITE_GCMP:
 520         case WLAN_CIPHER_SUITE_GCMP_256:
 521                 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
 522                 break;
 523         }
 524         kzfree(key);
 525 }
 526
 527 static void __ieee80211_key_destroy(struct ieee80211_key *key,
 528                                     bool delay_tailroom)
 529 {
 530         if (key->local)
 531                 ieee80211_key_disable_hw_accel(key);
 532
 533         if (key->local) {
 534                 struct ieee80211_sub_if_data *sdata = key->sdata;
 535
 536                 ieee80211_debugfs_key_remove(key);
 537
 538                 if (delay_tailroom) {
 539                         /* see ieee80211_delayed_tailroom_dec */
 540                         sdata->crypto_tx_tailroom_pending_dec++;
 541                         schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
 542                                               HZ/2);
 543                 } else {
 544                         sdata->crypto_tx_tailroom_needed_cnt--;
 545                 }
 546         }
 547
 548         ieee80211_key_free_common(key);
 549 }
 550
 551 static void ieee80211_key_destroy(struct ieee80211_key *key,
 552                                   bool delay_tailroom)
 553 {
 554         if (!key)
 555                 return;
 556
 557         /*
 558          * Synchronize so the TX path can no longer be using
 559          * this key before we free/remove it.
 560          */
 561         synchronize_net();
 562
 563         __ieee80211_key_destroy(key, delay_tailroom);
 564 }
 565
 566 void ieee80211_key_free_unused(struct ieee80211_key *key)
 567 {
 568         WARN_ON(key->sdata || key->local);
 569         ieee80211_key_free_common(key);
 570 }
 571
 572 int ieee80211_key_link(struct ieee80211_key *key,
 573                        struct ieee80211_sub_if_data *sdata,
 574                        struct sta_info *sta)
 575 {
 576         struct ieee80211_local *local = sdata->local;
 577         struct ieee80211_key *old_key;
 578         int idx, ret;
 579         bool pairwise;
 580
 581         pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
 582         idx = key->conf.keyidx;
 583         key->local = sdata->local;
 584         key->sdata = sdata;
 585         key->sta = sta;
 586
 587         mutex_lock(&sdata->local->key_mtx);
 588
 589         if (sta && pairwise)
 590                 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
 591         else if (sta)
 592                 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
 593         else
 594                 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 595
 596         increment_tailroom_need_count(sdata);
 597
 598         ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
 599         ieee80211_key_destroy(old_key, true);
 600
 601         ieee80211_debugfs_key_add(key);
 602
 603         if (!local->wowlan) {
 604                 ret = ieee80211_key_enable_hw_accel(key);
 605                 if (ret)
 606                         ieee80211_key_free(key, true);
 607         } else {
 608                 ret = 0;
 609         }
 610
 611         mutex_unlock(&sdata->local->key_mtx);
 612
 613         return ret;
 614 }
 615
 616 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
 617 {
 618         if (!key)
 619                 return;
 620
 621         /*
 622          * Replace key with nothingness if it was ever used.
 623          */
 624         if (key->sdata)
 625                 ieee80211_key_replace(key->sdata, key->sta,
 626                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 627                                 key, NULL);
 628         ieee80211_key_destroy(key, delay_tailroom);
 629 }
 630
 631 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
 632 {
 633         struct ieee80211_key *key;
 634
 635         ASSERT_RTNL();
 636
 637         if (WARN_ON(!ieee80211_sdata_running(sdata)))
 638                 return;
 639
 640         mutex_lock(&sdata->local->key_mtx);
 641
 642         sdata->crypto_tx_tailroom_needed_cnt = 0;
 643
 644         list_for_each_entry(key, &sdata->key_list, list) {
 645                 increment_tailroom_need_count(sdata);
 646                 ieee80211_key_enable_hw_accel(key);
 647         }
 648
 649         mutex_unlock(&sdata->local->key_mtx);
 650 }
 651
 652 void ieee80211_iter_keys(struct ieee80211_hw *hw,
 653                          struct ieee80211_vif *vif,
 654                          void (*iter)(struct ieee80211_hw *hw,
 655                                       struct ieee80211_vif *vif,
 656                                       struct ieee80211_sta *sta,
 657                                       struct ieee80211_key_conf *key,
 658                                       void *data),
 659                          void *iter_data)
 660 {
 661         struct ieee80211_local *local = hw_to_local(hw);
 662         struct ieee80211_key *key, *tmp;
 663         struct ieee80211_sub_if_data *sdata;
 664
 665         ASSERT_RTNL();
 666
 667         mutex_lock(&local->key_mtx);
 668         if (vif) {
 669                 sdata = vif_to_sdata(vif);
 670                 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
 671                         iter(hw, &sdata->vif,
 672                              key->sta ? &key->sta->sta : NULL,
 673                              &key->conf, iter_data);
 674         } else {
 675                 list_for_each_entry(sdata, &local->interfaces, list)
 676                         list_for_each_entry_safe(key, tmp,
 677                                                  &sdata->key_list, list)
 678                                 iter(hw, &sdata->vif,
 679                                      key->sta ? &key->sta->sta : NULL,
 680                                      &key->conf, iter_data);
 681         }
 682         mutex_unlock(&local->key_mtx);
 683 }
 684 EXPORT_SYMBOL(ieee80211_iter_keys);
 685
 686 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
 687                                       struct list_head *keys)
 688 {
 689         struct ieee80211_key *key, *tmp;
 690
 691         sdata->crypto_tx_tailroom_needed_cnt -=
 692                 sdata->crypto_tx_tailroom_pending_dec;
 693         sdata->crypto_tx_tailroom_pending_dec = 0;
 694
 695         ieee80211_debugfs_key_remove_mgmt_default(sdata);
 696
 697         list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
 698                 ieee80211_key_replace(key->sdata, key->sta,
 699                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 700                                 key, NULL);
 701                 list_add_tail(&key->list, keys);
 702         }
 703
 704         ieee80211_debugfs_key_update_default(sdata);
 705 }
 706
 707 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
 708                          bool force_synchronize)
 709 {
 710         struct ieee80211_local *local = sdata->local;
 711         struct ieee80211_sub_if_data *vlan;
 712         struct ieee80211_key *key, *tmp;
 713         LIST_HEAD(keys);
 714
 715         cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
 716
 717         mutex_lock(&local->key_mtx);
 718
 719         ieee80211_free_keys_iface(sdata, &keys);
 720
 721         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 722                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 723                         ieee80211_free_keys_iface(vlan, &keys);
 724         }
 725
 726         if (!list_empty(&keys) || force_synchronize)
 727                 synchronize_net();
 728         list_for_each_entry_safe(key, tmp, &keys, list)
 729                 __ieee80211_key_destroy(key, false);
 730
 731         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
 732                      sdata->crypto_tx_tailroom_pending_dec);
 733         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 734                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 735                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
 736                                      vlan->crypto_tx_tailroom_pending_dec);
 737         }
 738
 739         mutex_unlock(&local->key_mtx);
 740 }
 741
 742 void ieee80211_free_sta_keys(struct ieee80211_local *local,
 743                              struct sta_info *sta)
 744 {
 745         struct ieee80211_key *key;
 746         int i;
 747
 748         mutex_lock(&local->key_mtx);
 749         for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) {
 750                 key = key_mtx_dereference(local, sta->gtk[i]);
 751                 if (!key)
 752                         continue;
 753                 ieee80211_key_replace(key->sdata, key->sta,
 754                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 755                                 key, NULL);
 756                 __ieee80211_key_destroy(key, true);
 757         }
 758
 759         for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
 760                 key = key_mtx_dereference(local, sta->ptk[i]);
 761                 if (!key)
 762                         continue;
 763                 ieee80211_key_replace(key->sdata, key->sta,
 764                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 765                                 key, NULL);
 766                 __ieee80211_key_destroy(key, true);
 767         }
 768
 769         mutex_unlock(&local->key_mtx);
 770 }
 771
 772 void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
 773 {
 774         struct ieee80211_sub_if_data *sdata;
 775
 776         sdata = container_of(wk, struct ieee80211_sub_if_data,
 777                              dec_tailroom_needed_wk.work);
 778
 779         /*
 780          * The reason for the delayed tailroom needed decrementing is to
 781          * make roaming faster: during roaming, all keys are first deleted
 782          * and then new keys are installed. The first new key causes the
 783          * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
 784          * the cost of synchronize_net() (which can be slow). Avoid this
 785          * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
 786          * key removal for a while, so if we roam the value is larger than
 787          * zero and no 0->1 transition happens.
 788          *
 789          * The cost is that if the AP switching was from an AP with keys
 790          * to one without, we still allocate tailroom while it would no
 791          * longer be needed. However, in the typical (fast) roaming case
 792          * within an ESS this usually won't happen.
 793          */
 794
 795         mutex_lock(&sdata->local->key_mtx);
 796         sdata->crypto_tx_tailroom_needed_cnt -=
 797                 sdata->crypto_tx_tailroom_pending_dec;
 798         sdata->crypto_tx_tailroom_pending_dec = 0;
 799         mutex_unlock(&sdata->local->key_mtx);
 800 }
 801
 802 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
 803                                 const u8 *replay_ctr, gfp_t gfp)
 804 {
 805         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 806
 807         trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
 808
 809         cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
 810 }
 811 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
 812
 813 void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf,
 814                               struct ieee80211_key_seq *seq)
 815 {
 816         struct ieee80211_key *key;
 817         u64 pn64;
 818
 819         if (WARN_ON(!(keyconf->flags & IEEE80211_KEY_FLAG_GENERATE_IV)))
 820                 return;
 821
 822         key = container_of(keyconf, struct ieee80211_key, conf);
 823
 824         switch (key->conf.cipher) {
 825         case WLAN_CIPHER_SUITE_TKIP:
 826                 seq->tkip.iv32 = key->u.tkip.tx.iv32;
 827                 seq->tkip.iv16 = key->u.tkip.tx.iv16;
 828                 break;
 829         case WLAN_CIPHER_SUITE_CCMP:
 830         case WLAN_CIPHER_SUITE_CCMP_256:
 831                 pn64 = atomic64_read(&key->u.ccmp.tx_pn);
 832                 seq->ccmp.pn[5] = pn64;
 833                 seq->ccmp.pn[4] = pn64 >> 8;
 834                 seq->ccmp.pn[3] = pn64 >> 16;
 835                 seq->ccmp.pn[2] = pn64 >> 24;
 836                 seq->ccmp.pn[1] = pn64 >> 32;
 837                 seq->ccmp.pn[0] = pn64 >> 40;
 838                 break;
 839         case WLAN_CIPHER_SUITE_AES_CMAC:
 840         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 841                 pn64 = atomic64_read(&key->u.aes_cmac.tx_pn);
 842                 seq->ccmp.pn[5] = pn64;
 843                 seq->ccmp.pn[4] = pn64 >> 8;
 844                 seq->ccmp.pn[3] = pn64 >> 16;
 845                 seq->ccmp.pn[2] = pn64 >> 24;
 846                 seq->ccmp.pn[1] = pn64 >> 32;
 847                 seq->ccmp.pn[0] = pn64 >> 40;
 848                 break;
 849         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 850         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 851                 pn64 = atomic64_read(&key->u.aes_gmac.tx_pn);
 852                 seq->ccmp.pn[5] = pn64;
 853                 seq->ccmp.pn[4] = pn64 >> 8;
 854                 seq->ccmp.pn[3] = pn64 >> 16;
 855                 seq->ccmp.pn[2] = pn64 >> 24;
 856                 seq->ccmp.pn[1] = pn64 >> 32;
 857                 seq->ccmp.pn[0] = pn64 >> 40;
 858                 break;
 859         case WLAN_CIPHER_SUITE_GCMP:
 860         case WLAN_CIPHER_SUITE_GCMP_256:
 861                 pn64 = atomic64_read(&key->u.gcmp.tx_pn);
 862                 seq->gcmp.pn[5] = pn64;
 863                 seq->gcmp.pn[4] = pn64 >> 8;
 864                 seq->gcmp.pn[3] = pn64 >> 16;
 865                 seq->gcmp.pn[2] = pn64 >> 24;
 866                 seq->gcmp.pn[1] = pn64 >> 32;
 867                 seq->gcmp.pn[0] = pn64 >> 40;
 868                 break;
 869         default:
 870                 WARN_ON(1);
 871         }
 872 }
 873 EXPORT_SYMBOL(ieee80211_get_key_tx_seq);
 874
 875 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
 876                               int tid, struct ieee80211_key_seq *seq)
 877 {
 878         struct ieee80211_key *key;
 879         const u8 *pn;
 880
 881         key = container_of(keyconf, struct ieee80211_key, conf);
 882
 883         switch (key->conf.cipher) {
 884         case WLAN_CIPHER_SUITE_TKIP:
 885                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
 886                         return;
 887                 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
 888                 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
 889                 break;
 890         case WLAN_CIPHER_SUITE_CCMP:
 891         case WLAN_CIPHER_SUITE_CCMP_256:
 892                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
 893                         return;
 894                 if (tid < 0)
 895                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
 896                 else
 897                         pn = key->u.ccmp.rx_pn[tid];
 898                 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
 899                 break;
 900         case WLAN_CIPHER_SUITE_AES_CMAC:
 901         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 902                 if (WARN_ON(tid != 0))
 903                         return;
 904                 pn = key->u.aes_cmac.rx_pn;
 905                 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
 906                 break;
 907         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 908         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 909                 if (WARN_ON(tid != 0))
 910                         return;
 911                 pn = key->u.aes_gmac.rx_pn;
 912                 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
 913                 break;
 914         case WLAN_CIPHER_SUITE_GCMP:
 915         case WLAN_CIPHER_SUITE_GCMP_256:
 916                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
 917                         return;
 918                 if (tid < 0)
 919                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
 920                 else
 921                         pn = key->u.gcmp.rx_pn[tid];
 922                 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
 923                 break;
 924         }
 925 }
 926 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
 927
 928 void ieee80211_set_key_tx_seq(struct ieee80211_key_conf *keyconf,
 929                               struct ieee80211_key_seq *seq)
 930 {
 931         struct ieee80211_key *key;
 932         u64 pn64;
 933
 934         key = container_of(keyconf, struct ieee80211_key, conf);
 935
 936         switch (key->conf.cipher) {
 937         case WLAN_CIPHER_SUITE_TKIP:
 938                 key->u.tkip.tx.iv32 = seq->tkip.iv32;
 939                 key->u.tkip.tx.iv16 = seq->tkip.iv16;
 940                 break;
 941         case WLAN_CIPHER_SUITE_CCMP:
 942         case WLAN_CIPHER_SUITE_CCMP_256:
 943                 pn64 = (u64)seq->ccmp.pn[5] |
 944                        ((u64)seq->ccmp.pn[4] << 8) |
 945                        ((u64)seq->ccmp.pn[3] << 16) |
 946                        ((u64)seq->ccmp.pn[2] << 24) |
 947                        ((u64)seq->ccmp.pn[1] << 32) |
 948                        ((u64)seq->ccmp.pn[0] << 40);
 949                 atomic64_set(&key->u.ccmp.tx_pn, pn64);
 950                 break;
 951         case WLAN_CIPHER_SUITE_AES_CMAC:
 952         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 953                 pn64 = (u64)seq->aes_cmac.pn[5] |
 954                        ((u64)seq->aes_cmac.pn[4] << 8) |
 955                        ((u64)seq->aes_cmac.pn[3] << 16) |
 956                        ((u64)seq->aes_cmac.pn[2] << 24) |
 957                        ((u64)seq->aes_cmac.pn[1] << 32) |
 958                        ((u64)seq->aes_cmac.pn[0] << 40);
 959                 atomic64_set(&key->u.aes_cmac.tx_pn, pn64);
 960                 break;
 961         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 962         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 963                 pn64 = (u64)seq->aes_gmac.pn[5] |
 964                        ((u64)seq->aes_gmac.pn[4] << 8) |
 965                        ((u64)seq->aes_gmac.pn[3] << 16) |
 966                        ((u64)seq->aes_gmac.pn[2] << 24) |
 967                        ((u64)seq->aes_gmac.pn[1] << 32) |
 968                        ((u64)seq->aes_gmac.pn[0] << 40);
 969                 atomic64_set(&key->u.aes_gmac.tx_pn, pn64);
 970                 break;
 971         case WLAN_CIPHER_SUITE_GCMP:
 972         case WLAN_CIPHER_SUITE_GCMP_256:
 973                 pn64 = (u64)seq->gcmp.pn[5] |
 974                        ((u64)seq->gcmp.pn[4] << 8) |
 975                        ((u64)seq->gcmp.pn[3] << 16) |
 976                        ((u64)seq->gcmp.pn[2] << 24) |
 977                        ((u64)seq->gcmp.pn[1] << 32) |
 978                        ((u64)seq->gcmp.pn[0] << 40);
 979                 atomic64_set(&key->u.gcmp.tx_pn, pn64);
 980                 break;
 981         default:
 982                 WARN_ON(1);
 983                 break;
 984         }
 985 }
 986 EXPORT_SYMBOL_GPL(ieee80211_set_key_tx_seq);
 987
 988 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
 989                               int tid, struct ieee80211_key_seq *seq)
 990 {
 991         struct ieee80211_key *key;
 992         u8 *pn;
 993
 994         key = container_of(keyconf, struct ieee80211_key, conf);
 995
 996         switch (key->conf.cipher) {
 997         case WLAN_CIPHER_SUITE_TKIP:
 998                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
 999                         return;
1000                 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1001                 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1002                 break;
1003         case WLAN_CIPHER_SUITE_CCMP:
1004         case WLAN_CIPHER_SUITE_CCMP_256:
1005                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1006                         return;
1007                 if (tid < 0)
1008                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1009                 else
1010                         pn = key->u.ccmp.rx_pn[tid];
1011                 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1012                 break;
1013         case WLAN_CIPHER_SUITE_AES_CMAC:
1014         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1015                 if (WARN_ON(tid != 0))
1016                         return;
1017                 pn = key->u.aes_cmac.rx_pn;
1018                 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1019                 break;
1020         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1021         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1022                 if (WARN_ON(tid != 0))
1023                         return;
1024                 pn = key->u.aes_gmac.rx_pn;
1025                 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1026                 break;
1027         case WLAN_CIPHER_SUITE_GCMP:
1028         case WLAN_CIPHER_SUITE_GCMP_256:
1029                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1030                         return;
1031                 if (tid < 0)
1032                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1033                 else
1034                         pn = key->u.gcmp.rx_pn[tid];
1035                 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1036                 break;
1037         default:
1038                 WARN_ON(1);
1039                 break;
1040         }
1041 }
1042 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1043
1044 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1045 {
1046         struct ieee80211_key *key;
1047
1048         key = container_of(keyconf, struct ieee80211_key, conf);
1049
1050         assert_key_lock(key->local);
1051
1052         /*
1053          * if key was uploaded, we assume the driver will/has remove(d)
1054          * it, so adjust bookkeeping accordingly
1055          */
1056         if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1057                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1058
1059                 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
1060                       (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1061                         increment_tailroom_need_count(key->sdata);
1062         }
1063
1064         ieee80211_key_free(key, false);
1065 }
1066 EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1067
1068 struct ieee80211_key_conf *
1069 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1070                         struct ieee80211_key_conf *keyconf)
1071 {
1072         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1073         struct ieee80211_local *local = sdata->local;
1074         struct ieee80211_key *key;
1075         int err;
1076
1077         if (WARN_ON(!local->wowlan))
1078                 return ERR_PTR(-EINVAL);
1079
1080         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1081                 return ERR_PTR(-EINVAL);
1082
1083         key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1084                                   keyconf->keylen, keyconf->key,
1085                                   0, NULL, NULL);
1086         if (IS_ERR(key))
1087                 return ERR_CAST(key);
1088
1089         if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1090                 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1091
1092         err = ieee80211_key_link(key, sdata, NULL);
1093         if (err)
1094                 return ERR_PTR(err);
1095
1096         return &key->conf;
1097 }
1098 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);