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 = key->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         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 166                 /*
 167                  * The driver doesn't know anything about VLAN interfaces.
 168                  * Hence, don't send GTKs for VLAN interfaces to the driver.
 169                  */
 170                 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
 171                         ret = 1;
 172                         goto out_unsupported;
 173                 }
 174         }
 175
 176         ret = drv_set_key(key->local, SET_KEY, sdata,
 177                           sta ? &sta->sta : NULL, &key->conf);
 178
 179         if (!ret) {
 180                 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
 181
 182                 if (!((key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
 183                                            IEEE80211_KEY_FLAG_PUT_MIC_SPACE)) ||
 184                       (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 185                         decrease_tailroom_need_count(sdata, 1);
 186
 187                 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
 188                         (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
 189
 190                 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) &&
 191                         (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC));
 192
 193                 return 0;
 194         }
 195
 196         if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1)
 197                 sdata_err(sdata,
 198                           "failed to set key (%d, %pM) to hardware (%d)\n",
 199                           key->conf.keyidx,
 200                           sta ? sta->sta.addr : bcast_addr, ret);
 201
 202  out_unsupported:
 203         switch (key->conf.cipher) {
 204         case WLAN_CIPHER_SUITE_WEP40:
 205         case WLAN_CIPHER_SUITE_WEP104:
 206         case WLAN_CIPHER_SUITE_TKIP:
 207         case WLAN_CIPHER_SUITE_CCMP:
 208         case WLAN_CIPHER_SUITE_CCMP_256:
 209         case WLAN_CIPHER_SUITE_AES_CMAC:
 210         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 211         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 212         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 213         case WLAN_CIPHER_SUITE_GCMP:
 214         case WLAN_CIPHER_SUITE_GCMP_256:
 215                 /* all of these we can do in software - if driver can */
 216                 if (ret == 1)
 217                         return 0;
 218                 if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL))
 219                         return -EINVAL;
 220                 return 0;
 221         default:
 222                 return -EINVAL;
 223         }
 224 }
 225
 226 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
 227 {
 228         struct ieee80211_sub_if_data *sdata;
 229         struct sta_info *sta;
 230         int ret;
 231
 232         might_sleep();
 233
 234         if (!key || !key->local->ops->set_key)
 235                 return;
 236
 237         assert_key_lock(key->local);
 238
 239         if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 240                 return;
 241
 242         sta = key->sta;
 243         sdata = key->sdata;
 244
 245         if (!((key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
 246                                    IEEE80211_KEY_FLAG_PUT_MIC_SPACE)) ||
 247               (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 248                 increment_tailroom_need_count(sdata);
 249
 250         ret = drv_set_key(key->local, DISABLE_KEY, sdata,
 251                           sta ? &sta->sta : NULL, &key->conf);
 252
 253         if (ret)
 254                 sdata_err(sdata,
 255                           "failed to remove key (%d, %pM) from hardware (%d)\n",
 256                           key->conf.keyidx,
 257                           sta ? sta->sta.addr : bcast_addr, ret);
 258
 259         key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 260 }
 261
 262 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
 263                                         int idx, bool uni, bool multi)
 264 {
 265         struct ieee80211_key *key = NULL;
 266
 267         assert_key_lock(sdata->local);
 268
 269         if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
 270                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 271
 272         if (uni) {
 273                 rcu_assign_pointer(sdata->default_unicast_key, key);
 274                 ieee80211_check_fast_xmit_iface(sdata);
 275                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
 276                         drv_set_default_unicast_key(sdata->local, sdata, idx);
 277         }
 278
 279         if (multi)
 280                 rcu_assign_pointer(sdata->default_multicast_key, key);
 281
 282         ieee80211_debugfs_key_update_default(sdata);
 283 }
 284
 285 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
 286                                bool uni, bool multi)
 287 {
 288         mutex_lock(&sdata->local->key_mtx);
 289         __ieee80211_set_default_key(sdata, idx, uni, multi);
 290         mutex_unlock(&sdata->local->key_mtx);
 291 }
 292
 293 static void
 294 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
 295 {
 296         struct ieee80211_key *key = NULL;
 297
 298         assert_key_lock(sdata->local);
 299
 300         if (idx >= NUM_DEFAULT_KEYS &&
 301             idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
 302                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 303
 304         rcu_assign_pointer(sdata->default_mgmt_key, key);
 305
 306         ieee80211_debugfs_key_update_default(sdata);
 307 }
 308
 309 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
 310                                     int idx)
 311 {
 312         mutex_lock(&sdata->local->key_mtx);
 313         __ieee80211_set_default_mgmt_key(sdata, idx);
 314         mutex_unlock(&sdata->local->key_mtx);
 315 }
 316
 317
 318 static void ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
 319                                   struct sta_info *sta,
 320                                   bool pairwise,
 321                                   struct ieee80211_key *old,
 322                                   struct ieee80211_key *new)
 323 {
 324         int idx;
 325         bool defunikey, defmultikey, defmgmtkey;
 326
 327         /* caller must provide at least one old/new */
 328         if (WARN_ON(!new && !old))
 329                 return;
 330
 331         if (new)
 332                 list_add_tail_rcu(&new->list, &sdata->key_list);
 333
 334         WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
 335
 336         if (old)
 337                 idx = old->conf.keyidx;
 338         else
 339                 idx = new->conf.keyidx;
 340
 341         if (sta) {
 342                 if (pairwise) {
 343                         rcu_assign_pointer(sta->ptk[idx], new);
 344                         sta->ptk_idx = idx;
 345                         ieee80211_check_fast_xmit(sta);
 346                 } else {
 347                         rcu_assign_pointer(sta->gtk[idx], new);
 348                 }
 349                 ieee80211_check_fast_rx(sta);
 350         } else {
 351                 defunikey = old &&
 352                         old == key_mtx_dereference(sdata->local,
 353                                                 sdata->default_unicast_key);
 354                 defmultikey = old &&
 355                         old == key_mtx_dereference(sdata->local,
 356                                                 sdata->default_multicast_key);
 357                 defmgmtkey = old &&
 358                         old == key_mtx_dereference(sdata->local,
 359                                                 sdata->default_mgmt_key);
 360
 361                 if (defunikey && !new)
 362                         __ieee80211_set_default_key(sdata, -1, true, false);
 363                 if (defmultikey && !new)
 364                         __ieee80211_set_default_key(sdata, -1, false, true);
 365                 if (defmgmtkey && !new)
 366                         __ieee80211_set_default_mgmt_key(sdata, -1);
 367
 368                 rcu_assign_pointer(sdata->keys[idx], new);
 369                 if (defunikey && new)
 370                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 371                                                     true, false);
 372                 if (defmultikey && new)
 373                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 374                                                     false, true);
 375                 if (defmgmtkey && new)
 376                         __ieee80211_set_default_mgmt_key(sdata,
 377                                                          new->conf.keyidx);
 378         }
 379
 380         if (old)
 381                 list_del_rcu(&old->list);
 382 }
 383
 384 struct ieee80211_key *
 385 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
 386                     const u8 *key_data,
 387                     size_t seq_len, const u8 *seq,
 388                     const struct ieee80211_cipher_scheme *cs)
 389 {
 390         struct ieee80211_key *key;
 391         int i, j, err;
 392
 393         if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS))
 394                 return ERR_PTR(-EINVAL);
 395
 396         key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
 397         if (!key)
 398                 return ERR_PTR(-ENOMEM);
 399
 400         /*
 401          * Default to software encryption; we'll later upload the
 402          * key to the hardware if possible.
 403          */
 404         key->conf.flags = 0;
 405         key->flags = 0;
 406
 407         key->conf.cipher = cipher;
 408         key->conf.keyidx = idx;
 409         key->conf.keylen = key_len;
 410         switch (cipher) {
 411         case WLAN_CIPHER_SUITE_WEP40:
 412         case WLAN_CIPHER_SUITE_WEP104:
 413                 key->conf.iv_len = IEEE80211_WEP_IV_LEN;
 414                 key->conf.icv_len = IEEE80211_WEP_ICV_LEN;
 415                 break;
 416         case WLAN_CIPHER_SUITE_TKIP:
 417                 key->conf.iv_len = IEEE80211_TKIP_IV_LEN;
 418                 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN;
 419                 if (seq) {
 420                         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
 421                                 key->u.tkip.rx[i].iv32 =
 422                                         get_unaligned_le32(&seq[2]);
 423                                 key->u.tkip.rx[i].iv16 =
 424                                         get_unaligned_le16(seq);
 425                         }
 426                 }
 427                 spin_lock_init(&key->u.tkip.txlock);
 428                 break;
 429         case WLAN_CIPHER_SUITE_CCMP:
 430                 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN;
 431                 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN;
 432                 if (seq) {
 433                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 434                                 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++)
 435                                         key->u.ccmp.rx_pn[i][j] =
 436                                                 seq[IEEE80211_CCMP_PN_LEN - j - 1];
 437                 }
 438                 /*
 439                  * Initialize AES key state here as an optimization so that
 440                  * it does not need to be initialized for every packet.
 441                  */
 442                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 443                         key_data, key_len, IEEE80211_CCMP_MIC_LEN);
 444                 if (IS_ERR(key->u.ccmp.tfm)) {
 445                         err = PTR_ERR(key->u.ccmp.tfm);
 446                         kfree(key);
 447                         return ERR_PTR(err);
 448                 }
 449                 break;
 450         case WLAN_CIPHER_SUITE_CCMP_256:
 451                 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN;
 452                 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN;
 453                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 454                         for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++)
 455                                 key->u.ccmp.rx_pn[i][j] =
 456                                         seq[IEEE80211_CCMP_256_PN_LEN - j - 1];
 457                 /* Initialize AES key state here as an optimization so that
 458                  * it does not need to be initialized for every packet.
 459                  */
 460                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 461                         key_data, key_len, IEEE80211_CCMP_256_MIC_LEN);
 462                 if (IS_ERR(key->u.ccmp.tfm)) {
 463                         err = PTR_ERR(key->u.ccmp.tfm);
 464                         kfree(key);
 465                         return ERR_PTR(err);
 466                 }
 467                 break;
 468         case WLAN_CIPHER_SUITE_AES_CMAC:
 469         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 470                 key->conf.iv_len = 0;
 471                 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
 472                         key->conf.icv_len = sizeof(struct ieee80211_mmie);
 473                 else
 474                         key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 475                 if (seq)
 476                         for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
 477                                 key->u.aes_cmac.rx_pn[j] =
 478                                         seq[IEEE80211_CMAC_PN_LEN - j - 1];
 479                 /*
 480                  * Initialize AES key state here as an optimization so that
 481                  * it does not need to be initialized for every packet.
 482                  */
 483                 key->u.aes_cmac.tfm =
 484                         ieee80211_aes_cmac_key_setup(key_data, key_len);
 485                 if (IS_ERR(key->u.aes_cmac.tfm)) {
 486                         err = PTR_ERR(key->u.aes_cmac.tfm);
 487                         kfree(key);
 488                         return ERR_PTR(err);
 489                 }
 490                 break;
 491         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 492         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 493                 key->conf.iv_len = 0;
 494                 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 495                 if (seq)
 496                         for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++)
 497                                 key->u.aes_gmac.rx_pn[j] =
 498                                         seq[IEEE80211_GMAC_PN_LEN - j - 1];
 499                 /* Initialize AES key state here as an optimization so that
 500                  * it does not need to be initialized for every packet.
 501                  */
 502                 key->u.aes_gmac.tfm =
 503                         ieee80211_aes_gmac_key_setup(key_data, key_len);
 504                 if (IS_ERR(key->u.aes_gmac.tfm)) {
 505                         err = PTR_ERR(key->u.aes_gmac.tfm);
 506                         kfree(key);
 507                         return ERR_PTR(err);
 508                 }
 509                 break;
 510         case WLAN_CIPHER_SUITE_GCMP:
 511         case WLAN_CIPHER_SUITE_GCMP_256:
 512                 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
 513                 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
 514                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 515                         for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
 516                                 key->u.gcmp.rx_pn[i][j] =
 517                                         seq[IEEE80211_GCMP_PN_LEN - j - 1];
 518                 /* Initialize AES key state here as an optimization so that
 519                  * it does not need to be initialized for every packet.
 520                  */
 521                 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
 522                                                                       key_len);
 523                 if (IS_ERR(key->u.gcmp.tfm)) {
 524                         err = PTR_ERR(key->u.gcmp.tfm);
 525                         kfree(key);
 526                         return ERR_PTR(err);
 527                 }
 528                 break;
 529         default:
 530                 if (cs) {
 531                         if (seq_len && seq_len != cs->pn_len) {
 532                                 kfree(key);
 533                                 return ERR_PTR(-EINVAL);
 534                         }
 535
 536                         key->conf.iv_len = cs->hdr_len;
 537                         key->conf.icv_len = cs->mic_len;
 538                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 539                                 for (j = 0; j < seq_len; j++)
 540                                         key->u.gen.rx_pn[i][j] =
 541                                                         seq[seq_len - j - 1];
 542                         key->flags |= KEY_FLAG_CIPHER_SCHEME;
 543                 }
 544         }
 545         memcpy(key->conf.key, key_data, key_len);
 546         INIT_LIST_HEAD(&key->list);
 547
 548         return key;
 549 }
 550
 551 static void ieee80211_key_free_common(struct ieee80211_key *key)
 552 {
 553         switch (key->conf.cipher) {
 554         case WLAN_CIPHER_SUITE_CCMP:
 555         case WLAN_CIPHER_SUITE_CCMP_256:
 556                 ieee80211_aes_key_free(key->u.ccmp.tfm);
 557                 break;
 558         case WLAN_CIPHER_SUITE_AES_CMAC:
 559         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 560                 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
 561                 break;
 562         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 563         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 564                 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm);
 565                 break;
 566         case WLAN_CIPHER_SUITE_GCMP:
 567         case WLAN_CIPHER_SUITE_GCMP_256:
 568                 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
 569                 break;
 570         }
 571         kzfree(key);
 572 }
 573
 574 static void __ieee80211_key_destroy(struct ieee80211_key *key,
 575                                     bool delay_tailroom)
 576 {
 577         if (key->local)
 578                 ieee80211_key_disable_hw_accel(key);
 579
 580         if (key->local) {
 581                 struct ieee80211_sub_if_data *sdata = key->sdata;
 582
 583                 ieee80211_debugfs_key_remove(key);
 584
 585                 if (delay_tailroom) {
 586                         /* see ieee80211_delayed_tailroom_dec */
 587                         sdata->crypto_tx_tailroom_pending_dec++;
 588                         schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
 589                                               HZ/2);
 590                 } else {
 591                         decrease_tailroom_need_count(sdata, 1);
 592                 }
 593         }
 594
 595         ieee80211_key_free_common(key);
 596 }
 597
 598 static void ieee80211_key_destroy(struct ieee80211_key *key,
 599                                   bool delay_tailroom)
 600 {
 601         if (!key)
 602                 return;
 603
 604         /*
 605          * Synchronize so the TX path and rcu key iterators
 606          * can no longer be using this key before we free/remove it.
 607          */
 608         synchronize_net();
 609
 610         __ieee80211_key_destroy(key, delay_tailroom);
 611 }
 612
 613 void ieee80211_key_free_unused(struct ieee80211_key *key)
 614 {
 615         WARN_ON(key->sdata || key->local);
 616         ieee80211_key_free_common(key);
 617 }
 618
 619 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata,
 620                                     struct ieee80211_key *old,
 621                                     struct ieee80211_key *new)
 622 {
 623         u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP];
 624         u8 *tk_old, *tk_new;
 625
 626         if (!old || new->conf.keylen != old->conf.keylen)
 627                 return false;
 628
 629         tk_old = old->conf.key;
 630         tk_new = new->conf.key;
 631
 632         /*
 633          * In station mode, don't compare the TX MIC key, as it's never used
 634          * and offloaded rekeying may not care to send it to the host. This
 635          * is the case in iwlwifi, for example.
 636          */
 637         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 638             new->conf.cipher == WLAN_CIPHER_SUITE_TKIP &&
 639             new->conf.keylen == WLAN_KEY_LEN_TKIP &&
 640             !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
 641                 memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP);
 642                 memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP);
 643                 memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 644                 memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 645                 tk_old = tkip_old;
 646                 tk_new = tkip_new;
 647         }
 648
 649         return !crypto_memneq(tk_old, tk_new, new->conf.keylen);
 650 }
 651
 652 int ieee80211_key_link(struct ieee80211_key *key,
 653                        struct ieee80211_sub_if_data *sdata,
 654                        struct sta_info *sta)
 655 {
 656         struct ieee80211_local *local = sdata->local;
 657         struct ieee80211_key *old_key;
 658         int idx = key->conf.keyidx;
 659         bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
 660         /*
 661          * We want to delay tailroom updates only for station - in that
 662          * case it helps roaming speed, but in other cases it hurts and
 663          * can cause warnings to appear.
 664          */
 665         bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION;
 666         int ret;
 667
 668         mutex_lock(&sdata->local->key_mtx);
 669
 670         if (sta && pairwise)
 671                 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
 672         else if (sta)
 673                 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
 674         else
 675                 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 676
 677         /*
 678          * Silently accept key re-installation without really installing the
 679          * new version of the key to avoid nonce reuse or replay issues.
 680          */
 681         if (ieee80211_key_identical(sdata, old_key, key)) {
 682                 ieee80211_key_free_unused(key);
 683                 ret = 0;
 684                 goto out;
 685         }
 686
 687         key->local = sdata->local;
 688         key->sdata = sdata;
 689         key->sta = sta;
 690
 691         increment_tailroom_need_count(sdata);
 692
 693         ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
 694         ieee80211_key_destroy(old_key, delay_tailroom);
 695
 696         ieee80211_debugfs_key_add(key);
 697
 698         if (!local->wowlan) {
 699                 ret = ieee80211_key_enable_hw_accel(key);
 700                 if (ret)
 701                         ieee80211_key_free(key, delay_tailroom);
 702         } else {
 703                 ret = 0;
 704         }
 705
 706  out:
 707         mutex_unlock(&sdata->local->key_mtx);
 708
 709         return ret;
 710 }
 711
 712 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
 713 {
 714         if (!key)
 715                 return;
 716
 717         /*
 718          * Replace key with nothingness if it was ever used.
 719          */
 720         if (key->sdata)
 721                 ieee80211_key_replace(key->sdata, key->sta,
 722                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 723                                 key, NULL);
 724         ieee80211_key_destroy(key, delay_tailroom);
 725 }
 726
 727 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
 728 {
 729         struct ieee80211_key *key;
 730         struct ieee80211_sub_if_data *vlan;
 731
 732         ASSERT_RTNL();
 733
 734         if (WARN_ON(!ieee80211_sdata_running(sdata)))
 735                 return;
 736
 737         mutex_lock(&sdata->local->key_mtx);
 738
 739         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
 740                      sdata->crypto_tx_tailroom_pending_dec);
 741
 742         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 743                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 744                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
 745                                      vlan->crypto_tx_tailroom_pending_dec);
 746         }
 747
 748         list_for_each_entry(key, &sdata->key_list, list) {
 749                 increment_tailroom_need_count(sdata);
 750                 ieee80211_key_enable_hw_accel(key);
 751         }
 752
 753         mutex_unlock(&sdata->local->key_mtx);
 754 }
 755
 756 void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata)
 757 {
 758         struct ieee80211_sub_if_data *vlan;
 759
 760         mutex_lock(&sdata->local->key_mtx);
 761
 762         sdata->crypto_tx_tailroom_needed_cnt = 0;
 763
 764         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 765                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 766                         vlan->crypto_tx_tailroom_needed_cnt = 0;
 767         }
 768
 769         mutex_unlock(&sdata->local->key_mtx);
 770 }
 771
 772 void ieee80211_iter_keys(struct ieee80211_hw *hw,
 773                          struct ieee80211_vif *vif,
 774                          void (*iter)(struct ieee80211_hw *hw,
 775                                       struct ieee80211_vif *vif,
 776                                       struct ieee80211_sta *sta,
 777                                       struct ieee80211_key_conf *key,
 778                                       void *data),
 779                          void *iter_data)
 780 {
 781         struct ieee80211_local *local = hw_to_local(hw);
 782         struct ieee80211_key *key, *tmp;
 783         struct ieee80211_sub_if_data *sdata;
 784
 785         ASSERT_RTNL();
 786
 787         mutex_lock(&local->key_mtx);
 788         if (vif) {
 789                 sdata = vif_to_sdata(vif);
 790                 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
 791                         iter(hw, &sdata->vif,
 792                              key->sta ? &key->sta->sta : NULL,
 793                              &key->conf, iter_data);
 794         } else {
 795                 list_for_each_entry(sdata, &local->interfaces, list)
 796                         list_for_each_entry_safe(key, tmp,
 797                                                  &sdata->key_list, list)
 798                                 iter(hw, &sdata->vif,
 799                                      key->sta ? &key->sta->sta : NULL,
 800                                      &key->conf, iter_data);
 801         }
 802         mutex_unlock(&local->key_mtx);
 803 }
 804 EXPORT_SYMBOL(ieee80211_iter_keys);
 805
 806 static void
 807 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
 808                          struct ieee80211_sub_if_data *sdata,
 809                          void (*iter)(struct ieee80211_hw *hw,
 810                                       struct ieee80211_vif *vif,
 811                                       struct ieee80211_sta *sta,
 812                                       struct ieee80211_key_conf *key,
 813                                       void *data),
 814                          void *iter_data)
 815 {
 816         struct ieee80211_key *key;
 817
 818         list_for_each_entry_rcu(key, &sdata->key_list, list) {
 819                 /* skip keys of station in removal process */
 820                 if (key->sta && key->sta->removed)
 821                         continue;
 822                 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 823                         continue;
 824
 825                 iter(hw, &sdata->vif,
 826                      key->sta ? &key->sta->sta : NULL,
 827                      &key->conf, iter_data);
 828         }
 829 }
 830
 831 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
 832                              struct ieee80211_vif *vif,
 833                              void (*iter)(struct ieee80211_hw *hw,
 834                                           struct ieee80211_vif *vif,
 835                                           struct ieee80211_sta *sta,
 836                                           struct ieee80211_key_conf *key,
 837                                           void *data),
 838                              void *iter_data)
 839 {
 840         struct ieee80211_local *local = hw_to_local(hw);
 841         struct ieee80211_sub_if_data *sdata;
 842
 843         if (vif) {
 844                 sdata = vif_to_sdata(vif);
 845                 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
 846         } else {
 847                 list_for_each_entry_rcu(sdata, &local->interfaces, list)
 848                         _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
 849         }
 850 }
 851 EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
 852
 853 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
 854                                       struct list_head *keys)
 855 {
 856         struct ieee80211_key *key, *tmp;
 857
 858         decrease_tailroom_need_count(sdata,
 859                                      sdata->crypto_tx_tailroom_pending_dec);
 860         sdata->crypto_tx_tailroom_pending_dec = 0;
 861
 862         ieee80211_debugfs_key_remove_mgmt_default(sdata);
 863
 864         list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
 865                 ieee80211_key_replace(key->sdata, key->sta,
 866                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 867                                 key, NULL);
 868                 list_add_tail(&key->list, keys);
 869         }
 870
 871         ieee80211_debugfs_key_update_default(sdata);
 872 }
 873
 874 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
 875                          bool force_synchronize)
 876 {
 877         struct ieee80211_local *local = sdata->local;
 878         struct ieee80211_sub_if_data *vlan;
 879         struct ieee80211_sub_if_data *master;
 880         struct ieee80211_key *key, *tmp;
 881         LIST_HEAD(keys);
 882
 883         cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
 884
 885         mutex_lock(&local->key_mtx);
 886
 887         ieee80211_free_keys_iface(sdata, &keys);
 888
 889         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 890                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 891                         ieee80211_free_keys_iface(vlan, &keys);
 892         }
 893
 894         if (!list_empty(&keys) || force_synchronize)
 895                 synchronize_net();
 896         list_for_each_entry_safe(key, tmp, &keys, list)
 897                 __ieee80211_key_destroy(key, false);
 898
 899         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 900                 if (sdata->bss) {
 901                         master = container_of(sdata->bss,
 902                                               struct ieee80211_sub_if_data,
 903                                               u.ap);
 904
 905                         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
 906                                      master->crypto_tx_tailroom_needed_cnt);
 907                 }
 908         } else {
 909                 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
 910                              sdata->crypto_tx_tailroom_pending_dec);
 911         }
 912
 913         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 914                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 915                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
 916                                      vlan->crypto_tx_tailroom_pending_dec);
 917         }
 918
 919         mutex_unlock(&local->key_mtx);
 920 }
 921
 922 void ieee80211_free_sta_keys(struct ieee80211_local *local,
 923                              struct sta_info *sta)
 924 {
 925         struct ieee80211_key *key;
 926         int i;
 927
 928         mutex_lock(&local->key_mtx);
 929         for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) {
 930                 key = key_mtx_dereference(local, sta->gtk[i]);
 931                 if (!key)
 932                         continue;
 933                 ieee80211_key_replace(key->sdata, key->sta,
 934                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 935                                 key, NULL);
 936                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
 937                                         NL80211_IFTYPE_STATION);
 938         }
 939
 940         for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
 941                 key = key_mtx_dereference(local, sta->ptk[i]);
 942                 if (!key)
 943                         continue;
 944                 ieee80211_key_replace(key->sdata, key->sta,
 945                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 946                                 key, NULL);
 947                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
 948                                         NL80211_IFTYPE_STATION);
 949         }
 950
 951         mutex_unlock(&local->key_mtx);
 952 }
 953
 954 void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
 955 {
 956         struct ieee80211_sub_if_data *sdata;
 957
 958         sdata = container_of(wk, struct ieee80211_sub_if_data,
 959                              dec_tailroom_needed_wk.work);
 960
 961         /*
 962          * The reason for the delayed tailroom needed decrementing is to
 963          * make roaming faster: during roaming, all keys are first deleted
 964          * and then new keys are installed. The first new key causes the
 965          * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
 966          * the cost of synchronize_net() (which can be slow). Avoid this
 967          * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
 968          * key removal for a while, so if we roam the value is larger than
 969          * zero and no 0->1 transition happens.
 970          *
 971          * The cost is that if the AP switching was from an AP with keys
 972          * to one without, we still allocate tailroom while it would no
 973          * longer be needed. However, in the typical (fast) roaming case
 974          * within an ESS this usually won't happen.
 975          */
 976
 977         mutex_lock(&sdata->local->key_mtx);
 978         decrease_tailroom_need_count(sdata,
 979                                      sdata->crypto_tx_tailroom_pending_dec);
 980         sdata->crypto_tx_tailroom_pending_dec = 0;
 981         mutex_unlock(&sdata->local->key_mtx);
 982 }
 983
 984 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
 985                                 const u8 *replay_ctr, gfp_t gfp)
 986 {
 987         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 988
 989         trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
 990
 991         cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
 992 }
 993 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
 994
 995 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
 996                               int tid, struct ieee80211_key_seq *seq)
 997 {
 998         struct ieee80211_key *key;
 999         const u8 *pn;
1000
1001         key = container_of(keyconf, struct ieee80211_key, conf);
1002
1003         switch (key->conf.cipher) {
1004         case WLAN_CIPHER_SUITE_TKIP:
1005                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1006                         return;
1007                 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
1008                 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
1009                 break;
1010         case WLAN_CIPHER_SUITE_CCMP:
1011         case WLAN_CIPHER_SUITE_CCMP_256:
1012                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1013                         return;
1014                 if (tid < 0)
1015                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1016                 else
1017                         pn = key->u.ccmp.rx_pn[tid];
1018                 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
1019                 break;
1020         case WLAN_CIPHER_SUITE_AES_CMAC:
1021         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1022                 if (WARN_ON(tid != 0))
1023                         return;
1024                 pn = key->u.aes_cmac.rx_pn;
1025                 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
1026                 break;
1027         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1028         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1029                 if (WARN_ON(tid != 0))
1030                         return;
1031                 pn = key->u.aes_gmac.rx_pn;
1032                 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
1033                 break;
1034         case WLAN_CIPHER_SUITE_GCMP:
1035         case WLAN_CIPHER_SUITE_GCMP_256:
1036                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1037                         return;
1038                 if (tid < 0)
1039                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1040                 else
1041                         pn = key->u.gcmp.rx_pn[tid];
1042                 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
1043                 break;
1044         }
1045 }
1046 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
1047
1048 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1049                               int tid, struct ieee80211_key_seq *seq)
1050 {
1051         struct ieee80211_key *key;
1052         u8 *pn;
1053
1054         key = container_of(keyconf, struct ieee80211_key, conf);
1055
1056         switch (key->conf.cipher) {
1057         case WLAN_CIPHER_SUITE_TKIP:
1058                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1059                         return;
1060                 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1061                 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1062                 break;
1063         case WLAN_CIPHER_SUITE_CCMP:
1064         case WLAN_CIPHER_SUITE_CCMP_256:
1065                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1066                         return;
1067                 if (tid < 0)
1068                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1069                 else
1070                         pn = key->u.ccmp.rx_pn[tid];
1071                 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1072                 break;
1073         case WLAN_CIPHER_SUITE_AES_CMAC:
1074         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1075                 if (WARN_ON(tid != 0))
1076                         return;
1077                 pn = key->u.aes_cmac.rx_pn;
1078                 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1079                 break;
1080         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1081         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1082                 if (WARN_ON(tid != 0))
1083                         return;
1084                 pn = key->u.aes_gmac.rx_pn;
1085                 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1086                 break;
1087         case WLAN_CIPHER_SUITE_GCMP:
1088         case WLAN_CIPHER_SUITE_GCMP_256:
1089                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1090                         return;
1091                 if (tid < 0)
1092                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1093                 else
1094                         pn = key->u.gcmp.rx_pn[tid];
1095                 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1096                 break;
1097         default:
1098                 WARN_ON(1);
1099                 break;
1100         }
1101 }
1102 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1103
1104 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1105 {
1106         struct ieee80211_key *key;
1107
1108         key = container_of(keyconf, struct ieee80211_key, conf);
1109
1110         assert_key_lock(key->local);
1111
1112         /*
1113          * if key was uploaded, we assume the driver will/has remove(d)
1114          * it, so adjust bookkeeping accordingly
1115          */
1116         if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1117                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1118
1119                 if (!((key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
1120                                            IEEE80211_KEY_FLAG_PUT_MIC_SPACE)) ||
1121                       (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1122                         increment_tailroom_need_count(key->sdata);
1123         }
1124
1125         ieee80211_key_free(key, false);
1126 }
1127 EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1128
1129 struct ieee80211_key_conf *
1130 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1131                         struct ieee80211_key_conf *keyconf)
1132 {
1133         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1134         struct ieee80211_local *local = sdata->local;
1135         struct ieee80211_key *key;
1136         int err;
1137
1138         if (WARN_ON(!local->wowlan))
1139                 return ERR_PTR(-EINVAL);
1140
1141         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1142                 return ERR_PTR(-EINVAL);
1143
1144         key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1145                                   keyconf->keylen, keyconf->key,
1146                                   0, NULL, NULL);
1147         if (IS_ERR(key))
1148                 return ERR_CAST(key);
1149
1150         if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1151                 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1152
1153         err = ieee80211_key_link(key, sdata, NULL);
1154         if (err)
1155                 return ERR_PTR(err);
1156
1157         return &key->conf;
1158 }
1159 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);