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  * Copyright 2015-2017  Intel Deutschland GmbH
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/if_ether.h>
  15 #include <linux/etherdevice.h>
  16 #include <linux/list.h>
  17 #include <linux/rcupdate.h>
  18 #include <linux/rtnetlink.h>
  19 #include <linux/slab.h>
  20 #include <linux/export.h>
  21 #include <net/mac80211.h>
  22 #include <crypto/algapi.h>
  23 #include <asm/unaligned.h>
  24 #include "ieee80211_i.h"
  25 #include "driver-ops.h"
  26 #include "debugfs_key.h"
  27 #include "aes_ccm.h"
  28 #include "aes_cmac.h"
  29 #include "aes_gmac.h"
  30 #include "aes_gcm.h"
  31
  32
  33 /**
  34  * DOC: Key handling basics
  35  *
  36  * Key handling in mac80211 is done based on per-interface (sub_if_data)
  37  * keys and per-station keys. Since each station belongs to an interface,
  38  * each station key also belongs to that interface.
  39  *
  40  * Hardware acceleration is done on a best-effort basis for algorithms
  41  * that are implemented in software,  for each key the hardware is asked
  42  * to enable that key for offloading but if it cannot do that the key is
  43  * simply kept for software encryption (unless it is for an algorithm
  44  * that isn't implemented in software).
  45  * There is currently no way of knowing whether a key is handled in SW
  46  * or HW except by looking into debugfs.
  47  *
  48  * All key management is internally protected by a mutex. Within all
  49  * other parts of mac80211, key references are, just as STA structure
  50  * references, protected by RCU. Note, however, that some things are
  51  * unprotected, namely the key->sta dereferences within the hardware
  52  * acceleration functions. This means that sta_info_destroy() must
  53  * remove the key which waits for an RCU grace period.
  54  */
  55
  56 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
  57
  58 static void assert_key_lock(struct ieee80211_local *local)
  59 {
  60         lockdep_assert_held(&local->key_mtx);
  61 }
  62
  63 static void
  64 update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta)
  65 {
  66         struct ieee80211_sub_if_data *vlan;
  67
  68         if (sdata->vif.type != NL80211_IFTYPE_AP)
  69                 return;
  70
  71         /* crypto_tx_tailroom_needed_cnt is protected by this */
  72         assert_key_lock(sdata->local);
  73
  74         rcu_read_lock();
  75
  76         list_for_each_entry_rcu(vlan, &sdata->u.ap.vlans, u.vlan.list)
  77                 vlan->crypto_tx_tailroom_needed_cnt += delta;
  78
  79         rcu_read_unlock();
  80 }
  81
  82 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
  83 {
  84         /*
  85          * When this count is zero, SKB resizing for allocating tailroom
  86          * for IV or MMIC is skipped. But, this check has created two race
  87          * cases in xmit path while transiting from zero count to one:
  88          *
  89          * 1. SKB resize was skipped because no key was added but just before
  90          * the xmit key is added and SW encryption kicks off.
  91          *
  92          * 2. SKB resize was skipped because all the keys were hw planted but
  93          * just before xmit one of the key is deleted and SW encryption kicks
  94          * off.
  95          *
  96          * In both the above case SW encryption will find not enough space for
  97          * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
  98          *
  99          * Solution has been explained at
 100          * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
 101          */
 102
 103         assert_key_lock(sdata->local);
 104
 105         update_vlan_tailroom_need_count(sdata, 1);
 106
 107         if (!sdata->crypto_tx_tailroom_needed_cnt++) {
 108                 /*
 109                  * Flush all XMIT packets currently using HW encryption or no
 110                  * encryption at all if the count transition is from 0 -> 1.
 111                  */
 112                 synchronize_net();
 113         }
 114 }
 115
 116 static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata,
 117                                          int delta)
 118 {
 119         assert_key_lock(sdata->local);
 120
 121         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta);
 122
 123         update_vlan_tailroom_need_count(sdata, -delta);
 124         sdata->crypto_tx_tailroom_needed_cnt -= delta;
 125 }
 126
 127 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
 128 {
 129         struct ieee80211_sub_if_data *sdata;
 130         struct sta_info *sta;
 131         int ret = -EOPNOTSUPP;
 132
 133         might_sleep();
 134
 135         if (key->flags & KEY_FLAG_TAINTED) {
 136                 /* If we get here, it's during resume and the key is
 137                  * tainted so shouldn't be used/programmed any more.
 138                  * However, its flags may still indicate that it was
 139                  * programmed into the device (since we're in resume)
 140                  * so clear that flag now to avoid trying to remove
 141                  * it again later.
 142                  */
 143                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 144                 return -EINVAL;
 145         }
 146
 147         if (!key->local->ops->set_key)
 148                 goto out_unsupported;
 149
 150         assert_key_lock(key->local);
 151
 152         sta = key->sta;
 153
 154         /*
 155          * If this is a per-STA GTK, check if it
 156          * is supported; if not, return.
 157          */
 158         if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) &&
 159             !ieee80211_hw_check(&key->local->hw, SUPPORTS_PER_STA_GTK))
 160                 goto out_unsupported;
 161
 162         if (sta && !sta->uploaded)
 163                 goto out_unsupported;
 164
 165         sdata = key->sdata;
 166         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 167                 /*
 168                  * The driver doesn't know anything about VLAN interfaces.
 169                  * Hence, don't send GTKs for VLAN interfaces to the driver.
 170                  */
 171                 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE))
 172                         goto out_unsupported;
 173         }
 174
 175         ret = drv_set_key(key->local, SET_KEY, sdata,
 176                           sta ? &sta->sta : NULL, &key->conf);
 177
 178         if (!ret) {
 179                 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
 180
 181                 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
 182                       (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 183                         decrease_tailroom_need_count(sdata, 1);
 184
 185                 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
 186                         (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
 187
 188                 return 0;
 189         }
 190
 191         if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1)
 192                 sdata_err(sdata,
 193                           "failed to set key (%d, %pM) to hardware (%d)\n",
 194                           key->conf.keyidx,
 195                           sta ? sta->sta.addr : bcast_addr, ret);
 196
 197  out_unsupported:
 198         switch (key->conf.cipher) {
 199         case WLAN_CIPHER_SUITE_WEP40:
 200         case WLAN_CIPHER_SUITE_WEP104:
 201         case WLAN_CIPHER_SUITE_TKIP:
 202         case WLAN_CIPHER_SUITE_CCMP:
 203         case WLAN_CIPHER_SUITE_CCMP_256:
 204         case WLAN_CIPHER_SUITE_AES_CMAC:
 205         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 206         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 207         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 208         case WLAN_CIPHER_SUITE_GCMP:
 209         case WLAN_CIPHER_SUITE_GCMP_256:
 210                 /* all of these we can do in software - if driver can */
 211                 if (ret == 1)
 212                         return 0;
 213                 if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL))
 214                         return -EINVAL;
 215                 return 0;
 216         default:
 217                 return -EINVAL;
 218         }
 219 }
 220
 221 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
 222 {
 223         struct ieee80211_sub_if_data *sdata;
 224         struct sta_info *sta;
 225         int ret;
 226
 227         might_sleep();
 228
 229         if (!key || !key->local->ops->set_key)
 230                 return;
 231
 232         assert_key_lock(key->local);
 233
 234         if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 235                 return;
 236
 237         sta = key->sta;
 238         sdata = key->sdata;
 239
 240         if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
 241               (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 242                 increment_tailroom_need_count(sdata);
 243
 244         ret = drv_set_key(key->local, DISABLE_KEY, sdata,
 245                           sta ? &sta->sta : NULL, &key->conf);
 246
 247         if (ret)
 248                 sdata_err(sdata,
 249                           "failed to remove key (%d, %pM) from hardware (%d)\n",
 250                           key->conf.keyidx,
 251                           sta ? sta->sta.addr : bcast_addr, ret);
 252
 253         key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 254 }
 255
 256 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
 257                                         int idx, bool uni, bool multi)
 258 {
 259         struct ieee80211_key *key = NULL;
 260
 261         assert_key_lock(sdata->local);
 262
 263         if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
 264                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 265
 266         if (uni) {
 267                 rcu_assign_pointer(sdata->default_unicast_key, key);
 268                 ieee80211_check_fast_xmit_iface(sdata);
 269                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
 270                         drv_set_default_unicast_key(sdata->local, sdata, idx);
 271         }
 272
 273         if (multi)
 274                 rcu_assign_pointer(sdata->default_multicast_key, key);
 275
 276         ieee80211_debugfs_key_update_default(sdata);
 277 }
 278
 279 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
 280                                bool uni, bool multi)
 281 {
 282         mutex_lock(&sdata->local->key_mtx);
 283         __ieee80211_set_default_key(sdata, idx, uni, multi);
 284         mutex_unlock(&sdata->local->key_mtx);
 285 }
 286
 287 static void
 288 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
 289 {
 290         struct ieee80211_key *key = NULL;
 291
 292         assert_key_lock(sdata->local);
 293
 294         if (idx >= NUM_DEFAULT_KEYS &&
 295             idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
 296                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 297
 298         rcu_assign_pointer(sdata->default_mgmt_key, key);
 299
 300         ieee80211_debugfs_key_update_default(sdata);
 301 }
 302
 303 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
 304                                     int idx)
 305 {
 306         mutex_lock(&sdata->local->key_mtx);
 307         __ieee80211_set_default_mgmt_key(sdata, idx);
 308         mutex_unlock(&sdata->local->key_mtx);
 309 }
 310
 311
 312 static void ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
 313                                   struct sta_info *sta,
 314                                   bool pairwise,
 315                                   struct ieee80211_key *old,
 316                                   struct ieee80211_key *new)
 317 {
 318         int idx;
 319         bool defunikey, defmultikey, defmgmtkey;
 320
 321         /* caller must provide at least one old/new */
 322         if (WARN_ON(!new && !old))
 323                 return;
 324
 325         if (new)
 326                 list_add_tail_rcu(&new->list, &sdata->key_list);
 327
 328         WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
 329
 330         if (old)
 331                 idx = old->conf.keyidx;
 332         else
 333                 idx = new->conf.keyidx;
 334
 335         if (sta) {
 336                 if (pairwise) {
 337                         rcu_assign_pointer(sta->ptk[idx], new);
 338                         set_sta_flag(sta, WLAN_STA_USES_ENCRYPTION);
 339                         sta->ptk_idx = idx;
 340                         ieee80211_check_fast_xmit(sta);
 341                 } else {
 342                         rcu_assign_pointer(sta->gtk[idx], new);
 343                 }
 344                 ieee80211_check_fast_rx(sta);
 345         } else {
 346                 defunikey = old &&
 347                         old == key_mtx_dereference(sdata->local,
 348                                                 sdata->default_unicast_key);
 349                 defmultikey = old &&
 350                         old == key_mtx_dereference(sdata->local,
 351                                                 sdata->default_multicast_key);
 352                 defmgmtkey = old &&
 353                         old == key_mtx_dereference(sdata->local,
 354                                                 sdata->default_mgmt_key);
 355
 356                 if (defunikey && !new)
 357                         __ieee80211_set_default_key(sdata, -1, true, false);
 358                 if (defmultikey && !new)
 359                         __ieee80211_set_default_key(sdata, -1, false, true);
 360                 if (defmgmtkey && !new)
 361                         __ieee80211_set_default_mgmt_key(sdata, -1);
 362
 363                 rcu_assign_pointer(sdata->keys[idx], new);
 364                 if (defunikey && new)
 365                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 366                                                     true, false);
 367                 if (defmultikey && new)
 368                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 369                                                     false, true);
 370                 if (defmgmtkey && new)
 371                         __ieee80211_set_default_mgmt_key(sdata,
 372                                                          new->conf.keyidx);
 373         }
 374
 375         if (old)
 376                 list_del_rcu(&old->list);
 377 }
 378
 379 struct ieee80211_key *
 380 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
 381                     const u8 *key_data,
 382                     size_t seq_len, const u8 *seq,
 383                     const struct ieee80211_cipher_scheme *cs)
 384 {
 385         struct ieee80211_key *key;
 386         int i, j, err;
 387
 388         if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS))
 389                 return ERR_PTR(-EINVAL);
 390
 391         key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
 392         if (!key)
 393                 return ERR_PTR(-ENOMEM);
 394
 395         /*
 396          * Default to software encryption; we'll later upload the
 397          * key to the hardware if possible.
 398          */
 399         key->conf.flags = 0;
 400         key->flags = 0;
 401
 402         key->conf.cipher = cipher;
 403         key->conf.keyidx = idx;
 404         key->conf.keylen = key_len;
 405         switch (cipher) {
 406         case WLAN_CIPHER_SUITE_WEP40:
 407         case WLAN_CIPHER_SUITE_WEP104:
 408                 key->conf.iv_len = IEEE80211_WEP_IV_LEN;
 409                 key->conf.icv_len = IEEE80211_WEP_ICV_LEN;
 410                 break;
 411         case WLAN_CIPHER_SUITE_TKIP:
 412                 key->conf.iv_len = IEEE80211_TKIP_IV_LEN;
 413                 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN;
 414                 if (seq) {
 415                         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
 416                                 key->u.tkip.rx[i].iv32 =
 417                                         get_unaligned_le32(&seq[2]);
 418                                 key->u.tkip.rx[i].iv16 =
 419                                         get_unaligned_le16(seq);
 420                         }
 421                 }
 422                 spin_lock_init(&key->u.tkip.txlock);
 423                 break;
 424         case WLAN_CIPHER_SUITE_CCMP:
 425                 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN;
 426                 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN;
 427                 if (seq) {
 428                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 429                                 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++)
 430                                         key->u.ccmp.rx_pn[i][j] =
 431                                                 seq[IEEE80211_CCMP_PN_LEN - j - 1];
 432                 }
 433                 /*
 434                  * Initialize AES key state here as an optimization so that
 435                  * it does not need to be initialized for every packet.
 436                  */
 437                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 438                         key_data, key_len, IEEE80211_CCMP_MIC_LEN);
 439                 if (IS_ERR(key->u.ccmp.tfm)) {
 440                         err = PTR_ERR(key->u.ccmp.tfm);
 441                         kfree(key);
 442                         return ERR_PTR(err);
 443                 }
 444                 break;
 445         case WLAN_CIPHER_SUITE_CCMP_256:
 446                 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN;
 447                 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN;
 448                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 449                         for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++)
 450                                 key->u.ccmp.rx_pn[i][j] =
 451                                         seq[IEEE80211_CCMP_256_PN_LEN - j - 1];
 452                 /* Initialize AES key state here as an optimization so that
 453                  * it does not need to be initialized for every packet.
 454                  */
 455                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 456                         key_data, key_len, IEEE80211_CCMP_256_MIC_LEN);
 457                 if (IS_ERR(key->u.ccmp.tfm)) {
 458                         err = PTR_ERR(key->u.ccmp.tfm);
 459                         kfree(key);
 460                         return ERR_PTR(err);
 461                 }
 462                 break;
 463         case WLAN_CIPHER_SUITE_AES_CMAC:
 464         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 465                 key->conf.iv_len = 0;
 466                 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
 467                         key->conf.icv_len = sizeof(struct ieee80211_mmie);
 468                 else
 469                         key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 470                 if (seq)
 471                         for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
 472                                 key->u.aes_cmac.rx_pn[j] =
 473                                         seq[IEEE80211_CMAC_PN_LEN - j - 1];
 474                 /*
 475                  * Initialize AES key state here as an optimization so that
 476                  * it does not need to be initialized for every packet.
 477                  */
 478                 key->u.aes_cmac.tfm =
 479                         ieee80211_aes_cmac_key_setup(key_data, key_len);
 480                 if (IS_ERR(key->u.aes_cmac.tfm)) {
 481                         err = PTR_ERR(key->u.aes_cmac.tfm);
 482                         kfree(key);
 483                         return ERR_PTR(err);
 484                 }
 485                 break;
 486         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 487         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 488                 key->conf.iv_len = 0;
 489                 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 490                 if (seq)
 491                         for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++)
 492                                 key->u.aes_gmac.rx_pn[j] =
 493                                         seq[IEEE80211_GMAC_PN_LEN - j - 1];
 494                 /* Initialize AES key state here as an optimization so that
 495                  * it does not need to be initialized for every packet.
 496                  */
 497                 key->u.aes_gmac.tfm =
 498                         ieee80211_aes_gmac_key_setup(key_data, key_len);
 499                 if (IS_ERR(key->u.aes_gmac.tfm)) {
 500                         err = PTR_ERR(key->u.aes_gmac.tfm);
 501                         kfree(key);
 502                         return ERR_PTR(err);
 503                 }
 504                 break;
 505         case WLAN_CIPHER_SUITE_GCMP:
 506         case WLAN_CIPHER_SUITE_GCMP_256:
 507                 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
 508                 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
 509                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 510                         for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
 511                                 key->u.gcmp.rx_pn[i][j] =
 512                                         seq[IEEE80211_GCMP_PN_LEN - j - 1];
 513                 /* Initialize AES key state here as an optimization so that
 514                  * it does not need to be initialized for every packet.
 515                  */
 516                 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
 517                                                                       key_len);
 518                 if (IS_ERR(key->u.gcmp.tfm)) {
 519                         err = PTR_ERR(key->u.gcmp.tfm);
 520                         kfree(key);
 521                         return ERR_PTR(err);
 522                 }
 523                 break;
 524         default:
 525                 if (cs) {
 526                         if (seq_len && seq_len != cs->pn_len) {
 527                                 kfree(key);
 528                                 return ERR_PTR(-EINVAL);
 529                         }
 530
 531                         key->conf.iv_len = cs->hdr_len;
 532                         key->conf.icv_len = cs->mic_len;
 533                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 534                                 for (j = 0; j < seq_len; j++)
 535                                         key->u.gen.rx_pn[i][j] =
 536                                                         seq[seq_len - j - 1];
 537                         key->flags |= KEY_FLAG_CIPHER_SCHEME;
 538                 }
 539         }
 540         memcpy(key->conf.key, key_data, key_len);
 541         INIT_LIST_HEAD(&key->list);
 542
 543         return key;
 544 }
 545
 546 static void ieee80211_key_free_common(struct ieee80211_key *key)
 547 {
 548         switch (key->conf.cipher) {
 549         case WLAN_CIPHER_SUITE_CCMP:
 550         case WLAN_CIPHER_SUITE_CCMP_256:
 551                 ieee80211_aes_key_free(key->u.ccmp.tfm);
 552                 break;
 553         case WLAN_CIPHER_SUITE_AES_CMAC:
 554         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 555                 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
 556                 break;
 557         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 558         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 559                 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm);
 560                 break;
 561         case WLAN_CIPHER_SUITE_GCMP:
 562         case WLAN_CIPHER_SUITE_GCMP_256:
 563                 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
 564                 break;
 565         }
 566         kzfree(key);
 567 }
 568
 569 static void __ieee80211_key_destroy(struct ieee80211_key *key,
 570                                     bool delay_tailroom)
 571 {
 572         if (key->local)
 573                 ieee80211_key_disable_hw_accel(key);
 574
 575         if (key->local) {
 576                 struct ieee80211_sub_if_data *sdata = key->sdata;
 577
 578                 ieee80211_debugfs_key_remove(key);
 579
 580                 if (delay_tailroom) {
 581                         /* see ieee80211_delayed_tailroom_dec */
 582                         sdata->crypto_tx_tailroom_pending_dec++;
 583                         schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
 584                                               HZ/2);
 585                 } else {
 586                         decrease_tailroom_need_count(sdata, 1);
 587                 }
 588         }
 589
 590         ieee80211_key_free_common(key);
 591 }
 592
 593 static void ieee80211_key_destroy(struct ieee80211_key *key,
 594                                   bool delay_tailroom)
 595 {
 596         if (!key)
 597                 return;
 598
 599         /*
 600          * Synchronize so the TX path and rcu key iterators
 601          * can no longer be using this key before we free/remove it.
 602          */
 603         synchronize_net();
 604
 605         __ieee80211_key_destroy(key, delay_tailroom);
 606 }
 607
 608 void ieee80211_key_free_unused(struct ieee80211_key *key)
 609 {
 610         WARN_ON(key->sdata || key->local);
 611         ieee80211_key_free_common(key);
 612 }
 613
 614 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata,
 615                                     struct ieee80211_key *old,
 616                                     struct ieee80211_key *new)
 617 {
 618         u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP];
 619         u8 *tk_old, *tk_new;
 620
 621         if (!old || new->conf.keylen != old->conf.keylen)
 622                 return false;
 623
 624         tk_old = old->conf.key;
 625         tk_new = new->conf.key;
 626
 627         /*
 628          * In station mode, don't compare the TX MIC key, as it's never used
 629          * and offloaded rekeying may not care to send it to the host. This
 630          * is the case in iwlwifi, for example.
 631          */
 632         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 633             new->conf.cipher == WLAN_CIPHER_SUITE_TKIP &&
 634             new->conf.keylen == WLAN_KEY_LEN_TKIP &&
 635             !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
 636                 memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP);
 637                 memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP);
 638                 memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 639                 memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 640                 tk_old = tkip_old;
 641                 tk_new = tkip_new;
 642         }
 643
 644         return !crypto_memneq(tk_old, tk_new, new->conf.keylen);
 645 }
 646
 647 int ieee80211_key_link(struct ieee80211_key *key,
 648                        struct ieee80211_sub_if_data *sdata,
 649                        struct sta_info *sta)
 650 {
 651         struct ieee80211_local *local = sdata->local;
 652         static atomic_t key_color = ATOMIC_INIT(0);
 653         struct ieee80211_key *old_key;
 654         int idx = key->conf.keyidx;
 655         bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
 656         /*
 657          * We want to delay tailroom updates only for station - in that
 658          * case it helps roaming speed, but in other cases it hurts and
 659          * can cause warnings to appear.
 660          */
 661         bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION;
 662         int ret;
 663
 664         /*
 665          * Assign a unique ID to every key so we can easily prevent mixed
 666          * key and fragment cache attacks.
 667          */
 668         key->color = atomic_inc_return(&key_color);
 669
 670         mutex_lock(&sdata->local->key_mtx);
 671
 672         if (sta && pairwise)
 673                 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
 674         else if (sta)
 675                 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
 676         else
 677                 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 678
 679         /*
 680          * Silently accept key re-installation without really installing the
 681          * new version of the key to avoid nonce reuse or replay issues.
 682          */
 683         if (ieee80211_key_identical(sdata, old_key, key)) {
 684                 ieee80211_key_free_unused(key);
 685                 ret = 0;
 686                 goto out;
 687         }
 688
 689         key->local = sdata->local;
 690         key->sdata = sdata;
 691         key->sta = sta;
 692
 693         increment_tailroom_need_count(sdata);
 694
 695         ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
 696         ieee80211_key_destroy(old_key, delay_tailroom);
 697
 698         ieee80211_debugfs_key_add(key);
 699
 700         if (!local->wowlan) {
 701                 ret = ieee80211_key_enable_hw_accel(key);
 702                 if (ret)
 703                         ieee80211_key_free(key, delay_tailroom);
 704         } else {
 705                 ret = 0;
 706         }
 707
 708  out:
 709         mutex_unlock(&sdata->local->key_mtx);
 710
 711         return ret;
 712 }
 713
 714 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
 715 {
 716         if (!key)
 717                 return;
 718
 719         /*
 720          * Replace key with nothingness if it was ever used.
 721          */
 722         if (key->sdata)
 723                 ieee80211_key_replace(key->sdata, key->sta,
 724                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 725                                 key, NULL);
 726         ieee80211_key_destroy(key, delay_tailroom);
 727 }
 728
 729 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
 730 {
 731         struct ieee80211_key *key;
 732         struct ieee80211_sub_if_data *vlan;
 733
 734         ASSERT_RTNL();
 735
 736         if (WARN_ON(!ieee80211_sdata_running(sdata)))
 737                 return;
 738
 739         mutex_lock(&sdata->local->key_mtx);
 740
 741         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
 742                      sdata->crypto_tx_tailroom_pending_dec);
 743
 744         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 745                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 746                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
 747                                      vlan->crypto_tx_tailroom_pending_dec);
 748         }
 749
 750         list_for_each_entry(key, &sdata->key_list, list) {
 751                 increment_tailroom_need_count(sdata);
 752                 ieee80211_key_enable_hw_accel(key);
 753         }
 754
 755         mutex_unlock(&sdata->local->key_mtx);
 756 }
 757
 758 void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata)
 759 {
 760         struct ieee80211_sub_if_data *vlan;
 761
 762         mutex_lock(&sdata->local->key_mtx);
 763
 764         sdata->crypto_tx_tailroom_needed_cnt = 0;
 765
 766         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 767                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 768                         vlan->crypto_tx_tailroom_needed_cnt = 0;
 769         }
 770
 771         mutex_unlock(&sdata->local->key_mtx);
 772 }
 773
 774 void ieee80211_iter_keys(struct ieee80211_hw *hw,
 775                          struct ieee80211_vif *vif,
 776                          void (*iter)(struct ieee80211_hw *hw,
 777                                       struct ieee80211_vif *vif,
 778                                       struct ieee80211_sta *sta,
 779                                       struct ieee80211_key_conf *key,
 780                                       void *data),
 781                          void *iter_data)
 782 {
 783         struct ieee80211_local *local = hw_to_local(hw);
 784         struct ieee80211_key *key, *tmp;
 785         struct ieee80211_sub_if_data *sdata;
 786
 787         ASSERT_RTNL();
 788
 789         mutex_lock(&local->key_mtx);
 790         if (vif) {
 791                 sdata = vif_to_sdata(vif);
 792                 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
 793                         iter(hw, &sdata->vif,
 794                              key->sta ? &key->sta->sta : NULL,
 795                              &key->conf, iter_data);
 796         } else {
 797                 list_for_each_entry(sdata, &local->interfaces, list)
 798                         list_for_each_entry_safe(key, tmp,
 799                                                  &sdata->key_list, list)
 800                                 iter(hw, &sdata->vif,
 801                                      key->sta ? &key->sta->sta : NULL,
 802                                      &key->conf, iter_data);
 803         }
 804         mutex_unlock(&local->key_mtx);
 805 }
 806 EXPORT_SYMBOL(ieee80211_iter_keys);
 807
 808 static void
 809 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
 810                          struct ieee80211_sub_if_data *sdata,
 811                          void (*iter)(struct ieee80211_hw *hw,
 812                                       struct ieee80211_vif *vif,
 813                                       struct ieee80211_sta *sta,
 814                                       struct ieee80211_key_conf *key,
 815                                       void *data),
 816                          void *iter_data)
 817 {
 818         struct ieee80211_key *key;
 819
 820         list_for_each_entry_rcu(key, &sdata->key_list, list) {
 821                 /* skip keys of station in removal process */
 822                 if (key->sta && key->sta->removed)
 823                         continue;
 824                 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 825                         continue;
 826
 827                 iter(hw, &sdata->vif,
 828                      key->sta ? &key->sta->sta : NULL,
 829                      &key->conf, iter_data);
 830         }
 831 }
 832
 833 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
 834                              struct ieee80211_vif *vif,
 835                              void (*iter)(struct ieee80211_hw *hw,
 836                                           struct ieee80211_vif *vif,
 837                                           struct ieee80211_sta *sta,
 838                                           struct ieee80211_key_conf *key,
 839                                           void *data),
 840                              void *iter_data)
 841 {
 842         struct ieee80211_local *local = hw_to_local(hw);
 843         struct ieee80211_sub_if_data *sdata;
 844
 845         if (vif) {
 846                 sdata = vif_to_sdata(vif);
 847                 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
 848         } else {
 849                 list_for_each_entry_rcu(sdata, &local->interfaces, list)
 850                         _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
 851         }
 852 }
 853 EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
 854
 855 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
 856                                       struct list_head *keys)
 857 {
 858         struct ieee80211_key *key, *tmp;
 859
 860         decrease_tailroom_need_count(sdata,
 861                                      sdata->crypto_tx_tailroom_pending_dec);
 862         sdata->crypto_tx_tailroom_pending_dec = 0;
 863
 864         ieee80211_debugfs_key_remove_mgmt_default(sdata);
 865
 866         list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
 867                 ieee80211_key_replace(key->sdata, key->sta,
 868                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 869                                 key, NULL);
 870                 list_add_tail(&key->list, keys);
 871         }
 872
 873         ieee80211_debugfs_key_update_default(sdata);
 874 }
 875
 876 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
 877                          bool force_synchronize)
 878 {
 879         struct ieee80211_local *local = sdata->local;
 880         struct ieee80211_sub_if_data *vlan;
 881         struct ieee80211_sub_if_data *master;
 882         struct ieee80211_key *key, *tmp;
 883         LIST_HEAD(keys);
 884
 885         cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
 886
 887         mutex_lock(&local->key_mtx);
 888
 889         ieee80211_free_keys_iface(sdata, &keys);
 890
 891         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 892                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 893                         ieee80211_free_keys_iface(vlan, &keys);
 894         }
 895
 896         if (!list_empty(&keys) || force_synchronize)
 897                 synchronize_net();
 898         list_for_each_entry_safe(key, tmp, &keys, list)
 899                 __ieee80211_key_destroy(key, false);
 900
 901         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 902                 if (sdata->bss) {
 903                         master = container_of(sdata->bss,
 904                                               struct ieee80211_sub_if_data,
 905                                               u.ap);
 906
 907                         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
 908                                      master->crypto_tx_tailroom_needed_cnt);
 909                 }
 910         } else {
 911                 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
 912                              sdata->crypto_tx_tailroom_pending_dec);
 913         }
 914
 915         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 916                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 917                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
 918                                      vlan->crypto_tx_tailroom_pending_dec);
 919         }
 920
 921         mutex_unlock(&local->key_mtx);
 922 }
 923
 924 void ieee80211_free_sta_keys(struct ieee80211_local *local,
 925                              struct sta_info *sta)
 926 {
 927         struct ieee80211_key *key;
 928         int i;
 929
 930         mutex_lock(&local->key_mtx);
 931         for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) {
 932                 key = key_mtx_dereference(local, sta->gtk[i]);
 933                 if (!key)
 934                         continue;
 935                 ieee80211_key_replace(key->sdata, key->sta,
 936                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 937                                 key, NULL);
 938                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
 939                                         NL80211_IFTYPE_STATION);
 940         }
 941
 942         for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
 943                 key = key_mtx_dereference(local, sta->ptk[i]);
 944                 if (!key)
 945                         continue;
 946                 ieee80211_key_replace(key->sdata, key->sta,
 947                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 948                                 key, NULL);
 949                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
 950                                         NL80211_IFTYPE_STATION);
 951         }
 952
 953         mutex_unlock(&local->key_mtx);
 954 }
 955
 956 void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
 957 {
 958         struct ieee80211_sub_if_data *sdata;
 959
 960         sdata = container_of(wk, struct ieee80211_sub_if_data,
 961                              dec_tailroom_needed_wk.work);
 962
 963         /*
 964          * The reason for the delayed tailroom needed decrementing is to
 965          * make roaming faster: during roaming, all keys are first deleted
 966          * and then new keys are installed. The first new key causes the
 967          * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
 968          * the cost of synchronize_net() (which can be slow). Avoid this
 969          * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
 970          * key removal for a while, so if we roam the value is larger than
 971          * zero and no 0->1 transition happens.
 972          *
 973          * The cost is that if the AP switching was from an AP with keys
 974          * to one without, we still allocate tailroom while it would no
 975          * longer be needed. However, in the typical (fast) roaming case
 976          * within an ESS this usually won't happen.
 977          */
 978
 979         mutex_lock(&sdata->local->key_mtx);
 980         decrease_tailroom_need_count(sdata,
 981                                      sdata->crypto_tx_tailroom_pending_dec);
 982         sdata->crypto_tx_tailroom_pending_dec = 0;
 983         mutex_unlock(&sdata->local->key_mtx);
 984 }
 985
 986 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
 987                                 const u8 *replay_ctr, gfp_t gfp)
 988 {
 989         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 990
 991         trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
 992
 993         cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
 994 }
 995 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
 996
 997 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
 998                               int tid, struct ieee80211_key_seq *seq)
 999 {
1000         struct ieee80211_key *key;
1001         const u8 *pn;
1002
1003         key = container_of(keyconf, struct ieee80211_key, conf);
1004
1005         switch (key->conf.cipher) {
1006         case WLAN_CIPHER_SUITE_TKIP:
1007                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1008                         return;
1009                 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
1010                 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
1011                 break;
1012         case WLAN_CIPHER_SUITE_CCMP:
1013         case WLAN_CIPHER_SUITE_CCMP_256:
1014                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1015                         return;
1016                 if (tid < 0)
1017                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1018                 else
1019                         pn = key->u.ccmp.rx_pn[tid];
1020                 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
1021                 break;
1022         case WLAN_CIPHER_SUITE_AES_CMAC:
1023         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1024                 if (WARN_ON(tid != 0))
1025                         return;
1026                 pn = key->u.aes_cmac.rx_pn;
1027                 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
1028                 break;
1029         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1030         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1031                 if (WARN_ON(tid != 0))
1032                         return;
1033                 pn = key->u.aes_gmac.rx_pn;
1034                 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
1035                 break;
1036         case WLAN_CIPHER_SUITE_GCMP:
1037         case WLAN_CIPHER_SUITE_GCMP_256:
1038                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1039                         return;
1040                 if (tid < 0)
1041                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1042                 else
1043                         pn = key->u.gcmp.rx_pn[tid];
1044                 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
1045                 break;
1046         }
1047 }
1048 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
1049
1050 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1051                               int tid, struct ieee80211_key_seq *seq)
1052 {
1053         struct ieee80211_key *key;
1054         u8 *pn;
1055
1056         key = container_of(keyconf, struct ieee80211_key, conf);
1057
1058         switch (key->conf.cipher) {
1059         case WLAN_CIPHER_SUITE_TKIP:
1060                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1061                         return;
1062                 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1063                 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1064                 break;
1065         case WLAN_CIPHER_SUITE_CCMP:
1066         case WLAN_CIPHER_SUITE_CCMP_256:
1067                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1068                         return;
1069                 if (tid < 0)
1070                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1071                 else
1072                         pn = key->u.ccmp.rx_pn[tid];
1073                 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1074                 break;
1075         case WLAN_CIPHER_SUITE_AES_CMAC:
1076         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1077                 if (WARN_ON(tid != 0))
1078                         return;
1079                 pn = key->u.aes_cmac.rx_pn;
1080                 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1081                 break;
1082         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1083         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1084                 if (WARN_ON(tid != 0))
1085                         return;
1086                 pn = key->u.aes_gmac.rx_pn;
1087                 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1088                 break;
1089         case WLAN_CIPHER_SUITE_GCMP:
1090         case WLAN_CIPHER_SUITE_GCMP_256:
1091                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1092                         return;
1093                 if (tid < 0)
1094                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1095                 else
1096                         pn = key->u.gcmp.rx_pn[tid];
1097                 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1098                 break;
1099         default:
1100                 WARN_ON(1);
1101                 break;
1102         }
1103 }
1104 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1105
1106 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1107 {
1108         struct ieee80211_key *key;
1109
1110         key = container_of(keyconf, struct ieee80211_key, conf);
1111
1112         assert_key_lock(key->local);
1113
1114         /*
1115          * if key was uploaded, we assume the driver will/has remove(d)
1116          * it, so adjust bookkeeping accordingly
1117          */
1118         if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1119                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1120
1121                 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
1122                       (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1123                         increment_tailroom_need_count(key->sdata);
1124         }
1125
1126         ieee80211_key_free(key, false);
1127 }
1128 EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1129
1130 struct ieee80211_key_conf *
1131 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1132                         struct ieee80211_key_conf *keyconf)
1133 {
1134         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1135         struct ieee80211_local *local = sdata->local;
1136         struct ieee80211_key *key;
1137         int err;
1138
1139         if (WARN_ON(!local->wowlan))
1140                 return ERR_PTR(-EINVAL);
1141
1142         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1143                 return ERR_PTR(-EINVAL);
1144
1145         key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1146                                   keyconf->keylen, keyconf->key,
1147                                   0, NULL, NULL);
1148         if (IS_ERR(key))
1149                 return ERR_CAST(key);
1150
1151         if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1152                 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1153
1154         err = ieee80211_key_link(key, sdata, NULL);
1155         if (err)
1156                 return ERR_PTR(err);
1157
1158         return &key->conf;
1159 }
1160 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);