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                         set_sta_flag(sta, WLAN_STA_USES_ENCRYPTION);
 345                         sta->ptk_idx = idx;
 346                         ieee80211_check_fast_xmit(sta);
 347                 } else {
 348                         rcu_assign_pointer(sta->gtk[idx], new);
 349                 }
 350                 ieee80211_check_fast_rx(sta);
 351         } else {
 352                 defunikey = old &&
 353                         old == key_mtx_dereference(sdata->local,
 354                                                 sdata->default_unicast_key);
 355                 defmultikey = old &&
 356                         old == key_mtx_dereference(sdata->local,
 357                                                 sdata->default_multicast_key);
 358                 defmgmtkey = old &&
 359                         old == key_mtx_dereference(sdata->local,
 360                                                 sdata->default_mgmt_key);
 361
 362                 if (defunikey && !new)
 363                         __ieee80211_set_default_key(sdata, -1, true, false);
 364                 if (defmultikey && !new)
 365                         __ieee80211_set_default_key(sdata, -1, false, true);
 366                 if (defmgmtkey && !new)
 367                         __ieee80211_set_default_mgmt_key(sdata, -1);
 368
 369                 rcu_assign_pointer(sdata->keys[idx], new);
 370                 if (defunikey && new)
 371                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 372                                                     true, false);
 373                 if (defmultikey && new)
 374                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 375                                                     false, true);
 376                 if (defmgmtkey && new)
 377                         __ieee80211_set_default_mgmt_key(sdata,
 378                                                          new->conf.keyidx);
 379         }
 380
 381         if (old)
 382                 list_del_rcu(&old->list);
 383 }
 384
 385 struct ieee80211_key *
 386 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
 387                     const u8 *key_data,
 388                     size_t seq_len, const u8 *seq,
 389                     const struct ieee80211_cipher_scheme *cs)
 390 {
 391         struct ieee80211_key *key;
 392         int i, j, err;
 393
 394         if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS))
 395                 return ERR_PTR(-EINVAL);
 396
 397         key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
 398         if (!key)
 399                 return ERR_PTR(-ENOMEM);
 400
 401         /*
 402          * Default to software encryption; we'll later upload the
 403          * key to the hardware if possible.
 404          */
 405         key->conf.flags = 0;
 406         key->flags = 0;
 407
 408         key->conf.cipher = cipher;
 409         key->conf.keyidx = idx;
 410         key->conf.keylen = key_len;
 411         switch (cipher) {
 412         case WLAN_CIPHER_SUITE_WEP40:
 413         case WLAN_CIPHER_SUITE_WEP104:
 414                 key->conf.iv_len = IEEE80211_WEP_IV_LEN;
 415                 key->conf.icv_len = IEEE80211_WEP_ICV_LEN;
 416                 break;
 417         case WLAN_CIPHER_SUITE_TKIP:
 418                 key->conf.iv_len = IEEE80211_TKIP_IV_LEN;
 419                 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN;
 420                 if (seq) {
 421                         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
 422                                 key->u.tkip.rx[i].iv32 =
 423                                         get_unaligned_le32(&seq[2]);
 424                                 key->u.tkip.rx[i].iv16 =
 425                                         get_unaligned_le16(seq);
 426                         }
 427                 }
 428                 spin_lock_init(&key->u.tkip.txlock);
 429                 break;
 430         case WLAN_CIPHER_SUITE_CCMP:
 431                 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN;
 432                 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN;
 433                 if (seq) {
 434                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 435                                 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++)
 436                                         key->u.ccmp.rx_pn[i][j] =
 437                                                 seq[IEEE80211_CCMP_PN_LEN - j - 1];
 438                 }
 439                 /*
 440                  * Initialize AES key state here as an optimization so that
 441                  * it does not need to be initialized for every packet.
 442                  */
 443                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 444                         key_data, key_len, IEEE80211_CCMP_MIC_LEN);
 445                 if (IS_ERR(key->u.ccmp.tfm)) {
 446                         err = PTR_ERR(key->u.ccmp.tfm);
 447                         kfree(key);
 448                         return ERR_PTR(err);
 449                 }
 450                 break;
 451         case WLAN_CIPHER_SUITE_CCMP_256:
 452                 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN;
 453                 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN;
 454                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 455                         for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++)
 456                                 key->u.ccmp.rx_pn[i][j] =
 457                                         seq[IEEE80211_CCMP_256_PN_LEN - j - 1];
 458                 /* Initialize AES key state here as an optimization so that
 459                  * it does not need to be initialized for every packet.
 460                  */
 461                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 462                         key_data, key_len, IEEE80211_CCMP_256_MIC_LEN);
 463                 if (IS_ERR(key->u.ccmp.tfm)) {
 464                         err = PTR_ERR(key->u.ccmp.tfm);
 465                         kfree(key);
 466                         return ERR_PTR(err);
 467                 }
 468                 break;
 469         case WLAN_CIPHER_SUITE_AES_CMAC:
 470         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 471                 key->conf.iv_len = 0;
 472                 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
 473                         key->conf.icv_len = sizeof(struct ieee80211_mmie);
 474                 else
 475                         key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 476                 if (seq)
 477                         for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
 478                                 key->u.aes_cmac.rx_pn[j] =
 479                                         seq[IEEE80211_CMAC_PN_LEN - j - 1];
 480                 /*
 481                  * Initialize AES key state here as an optimization so that
 482                  * it does not need to be initialized for every packet.
 483                  */
 484                 key->u.aes_cmac.tfm =
 485                         ieee80211_aes_cmac_key_setup(key_data, key_len);
 486                 if (IS_ERR(key->u.aes_cmac.tfm)) {
 487                         err = PTR_ERR(key->u.aes_cmac.tfm);
 488                         kfree(key);
 489                         return ERR_PTR(err);
 490                 }
 491                 break;
 492         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 493         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 494                 key->conf.iv_len = 0;
 495                 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 496                 if (seq)
 497                         for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++)
 498                                 key->u.aes_gmac.rx_pn[j] =
 499                                         seq[IEEE80211_GMAC_PN_LEN - j - 1];
 500                 /* Initialize AES key state here as an optimization so that
 501                  * it does not need to be initialized for every packet.
 502                  */
 503                 key->u.aes_gmac.tfm =
 504                         ieee80211_aes_gmac_key_setup(key_data, key_len);
 505                 if (IS_ERR(key->u.aes_gmac.tfm)) {
 506                         err = PTR_ERR(key->u.aes_gmac.tfm);
 507                         kfree(key);
 508                         return ERR_PTR(err);
 509                 }
 510                 break;
 511         case WLAN_CIPHER_SUITE_GCMP:
 512         case WLAN_CIPHER_SUITE_GCMP_256:
 513                 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
 514                 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
 515                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 516                         for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
 517                                 key->u.gcmp.rx_pn[i][j] =
 518                                         seq[IEEE80211_GCMP_PN_LEN - j - 1];
 519                 /* Initialize AES key state here as an optimization so that
 520                  * it does not need to be initialized for every packet.
 521                  */
 522                 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
 523                                                                       key_len);
 524                 if (IS_ERR(key->u.gcmp.tfm)) {
 525                         err = PTR_ERR(key->u.gcmp.tfm);
 526                         kfree(key);
 527                         return ERR_PTR(err);
 528                 }
 529                 break;
 530         default:
 531                 if (cs) {
 532                         if (seq_len && seq_len != cs->pn_len) {
 533                                 kfree(key);
 534                                 return ERR_PTR(-EINVAL);
 535                         }
 536
 537                         key->conf.iv_len = cs->hdr_len;
 538                         key->conf.icv_len = cs->mic_len;
 539                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 540                                 for (j = 0; j < seq_len; j++)
 541                                         key->u.gen.rx_pn[i][j] =
 542                                                         seq[seq_len - j - 1];
 543                         key->flags |= KEY_FLAG_CIPHER_SCHEME;
 544                 }
 545         }
 546         memcpy(key->conf.key, key_data, key_len);
 547         INIT_LIST_HEAD(&key->list);
 548
 549         return key;
 550 }
 551
 552 static void ieee80211_key_free_common(struct ieee80211_key *key)
 553 {
 554         switch (key->conf.cipher) {
 555         case WLAN_CIPHER_SUITE_CCMP:
 556         case WLAN_CIPHER_SUITE_CCMP_256:
 557                 ieee80211_aes_key_free(key->u.ccmp.tfm);
 558                 break;
 559         case WLAN_CIPHER_SUITE_AES_CMAC:
 560         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 561                 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
 562                 break;
 563         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 564         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 565                 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm);
 566                 break;
 567         case WLAN_CIPHER_SUITE_GCMP:
 568         case WLAN_CIPHER_SUITE_GCMP_256:
 569                 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
 570                 break;
 571         }
 572         kzfree(key);
 573 }
 574
 575 static void __ieee80211_key_destroy(struct ieee80211_key *key,
 576                                     bool delay_tailroom)
 577 {
 578         if (key->local)
 579                 ieee80211_key_disable_hw_accel(key);
 580
 581         if (key->local) {
 582                 struct ieee80211_sub_if_data *sdata = key->sdata;
 583
 584                 ieee80211_debugfs_key_remove(key);
 585
 586                 if (delay_tailroom) {
 587                         /* see ieee80211_delayed_tailroom_dec */
 588                         sdata->crypto_tx_tailroom_pending_dec++;
 589                         schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
 590                                               HZ/2);
 591                 } else {
 592                         decrease_tailroom_need_count(sdata, 1);
 593                 }
 594         }
 595
 596         ieee80211_key_free_common(key);
 597 }
 598
 599 static void ieee80211_key_destroy(struct ieee80211_key *key,
 600                                   bool delay_tailroom)
 601 {
 602         if (!key)
 603                 return;
 604
 605         /*
 606          * Synchronize so the TX path and rcu key iterators
 607          * can no longer be using this key before we free/remove it.
 608          */
 609         synchronize_net();
 610
 611         __ieee80211_key_destroy(key, delay_tailroom);
 612 }
 613
 614 void ieee80211_key_free_unused(struct ieee80211_key *key)
 615 {
 616         WARN_ON(key->sdata || key->local);
 617         ieee80211_key_free_common(key);
 618 }
 619
 620 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata,
 621                                     struct ieee80211_key *old,
 622                                     struct ieee80211_key *new)
 623 {
 624         u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP];
 625         u8 *tk_old, *tk_new;
 626
 627         if (!old || new->conf.keylen != old->conf.keylen)
 628                 return false;
 629
 630         tk_old = old->conf.key;
 631         tk_new = new->conf.key;
 632
 633         /*
 634          * In station mode, don't compare the TX MIC key, as it's never used
 635          * and offloaded rekeying may not care to send it to the host. This
 636          * is the case in iwlwifi, for example.
 637          */
 638         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 639             new->conf.cipher == WLAN_CIPHER_SUITE_TKIP &&
 640             new->conf.keylen == WLAN_KEY_LEN_TKIP &&
 641             !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
 642                 memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP);
 643                 memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP);
 644                 memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 645                 memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 646                 tk_old = tkip_old;
 647                 tk_new = tkip_new;
 648         }
 649
 650         return !crypto_memneq(tk_old, tk_new, new->conf.keylen);
 651 }
 652
 653 int ieee80211_key_link(struct ieee80211_key *key,
 654                        struct ieee80211_sub_if_data *sdata,
 655                        struct sta_info *sta)
 656 {
 657         static atomic_t key_color = ATOMIC_INIT(0);
 658         struct ieee80211_local *local = sdata->local;
 659         struct ieee80211_key *old_key;
 660         int idx = key->conf.keyidx;
 661         bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
 662         /*
 663          * We want to delay tailroom updates only for station - in that
 664          * case it helps roaming speed, but in other cases it hurts and
 665          * can cause warnings to appear.
 666          */
 667         bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION;
 668         int ret;
 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         /*
 694          * Assign a unique ID to every key so we can easily prevent mixed
 695          * key and fragment cache attacks.
 696          */
 697         key->color = atomic_inc_return(&key_color);
 698
 699         increment_tailroom_need_count(sdata);
 700
 701         ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
 702         ieee80211_key_destroy(old_key, delay_tailroom);
 703
 704         ieee80211_debugfs_key_add(key);
 705
 706         if (!local->wowlan) {
 707                 ret = ieee80211_key_enable_hw_accel(key);
 708                 if (ret)
 709                         ieee80211_key_free(key, delay_tailroom);
 710         } else {
 711                 ret = 0;
 712         }
 713
 714  out:
 715         mutex_unlock(&sdata->local->key_mtx);
 716
 717         return ret;
 718 }
 719
 720 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
 721 {
 722         if (!key)
 723                 return;
 724
 725         /*
 726          * Replace key with nothingness if it was ever used.
 727          */
 728         if (key->sdata)
 729                 ieee80211_key_replace(key->sdata, key->sta,
 730                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 731                                 key, NULL);
 732         ieee80211_key_destroy(key, delay_tailroom);
 733 }
 734
 735 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
 736 {
 737         struct ieee80211_key *key;
 738         struct ieee80211_sub_if_data *vlan;
 739
 740         ASSERT_RTNL();
 741
 742         if (WARN_ON(!ieee80211_sdata_running(sdata)))
 743                 return;
 744
 745         mutex_lock(&sdata->local->key_mtx);
 746
 747         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
 748                      sdata->crypto_tx_tailroom_pending_dec);
 749
 750         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 751                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 752                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
 753                                      vlan->crypto_tx_tailroom_pending_dec);
 754         }
 755
 756         list_for_each_entry(key, &sdata->key_list, list) {
 757                 increment_tailroom_need_count(sdata);
 758                 ieee80211_key_enable_hw_accel(key);
 759         }
 760
 761         mutex_unlock(&sdata->local->key_mtx);
 762 }
 763
 764 void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata)
 765 {
 766         struct ieee80211_sub_if_data *vlan;
 767
 768         mutex_lock(&sdata->local->key_mtx);
 769
 770         sdata->crypto_tx_tailroom_needed_cnt = 0;
 771
 772         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 773                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 774                         vlan->crypto_tx_tailroom_needed_cnt = 0;
 775         }
 776
 777         mutex_unlock(&sdata->local->key_mtx);
 778 }
 779
 780 void ieee80211_iter_keys(struct ieee80211_hw *hw,
 781                          struct ieee80211_vif *vif,
 782                          void (*iter)(struct ieee80211_hw *hw,
 783                                       struct ieee80211_vif *vif,
 784                                       struct ieee80211_sta *sta,
 785                                       struct ieee80211_key_conf *key,
 786                                       void *data),
 787                          void *iter_data)
 788 {
 789         struct ieee80211_local *local = hw_to_local(hw);
 790         struct ieee80211_key *key, *tmp;
 791         struct ieee80211_sub_if_data *sdata;
 792
 793         ASSERT_RTNL();
 794
 795         mutex_lock(&local->key_mtx);
 796         if (vif) {
 797                 sdata = vif_to_sdata(vif);
 798                 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
 799                         iter(hw, &sdata->vif,
 800                              key->sta ? &key->sta->sta : NULL,
 801                              &key->conf, iter_data);
 802         } else {
 803                 list_for_each_entry(sdata, &local->interfaces, list)
 804                         list_for_each_entry_safe(key, tmp,
 805                                                  &sdata->key_list, list)
 806                                 iter(hw, &sdata->vif,
 807                                      key->sta ? &key->sta->sta : NULL,
 808                                      &key->conf, iter_data);
 809         }
 810         mutex_unlock(&local->key_mtx);
 811 }
 812 EXPORT_SYMBOL(ieee80211_iter_keys);
 813
 814 static void
 815 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
 816                          struct ieee80211_sub_if_data *sdata,
 817                          void (*iter)(struct ieee80211_hw *hw,
 818                                       struct ieee80211_vif *vif,
 819                                       struct ieee80211_sta *sta,
 820                                       struct ieee80211_key_conf *key,
 821                                       void *data),
 822                          void *iter_data)
 823 {
 824         struct ieee80211_key *key;
 825
 826         list_for_each_entry_rcu(key, &sdata->key_list, list) {
 827                 /* skip keys of station in removal process */
 828                 if (key->sta && key->sta->removed)
 829                         continue;
 830                 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 831                         continue;
 832
 833                 iter(hw, &sdata->vif,
 834                      key->sta ? &key->sta->sta : NULL,
 835                      &key->conf, iter_data);
 836         }
 837 }
 838
 839 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
 840                              struct ieee80211_vif *vif,
 841                              void (*iter)(struct ieee80211_hw *hw,
 842                                           struct ieee80211_vif *vif,
 843                                           struct ieee80211_sta *sta,
 844                                           struct ieee80211_key_conf *key,
 845                                           void *data),
 846                              void *iter_data)
 847 {
 848         struct ieee80211_local *local = hw_to_local(hw);
 849         struct ieee80211_sub_if_data *sdata;
 850
 851         if (vif) {
 852                 sdata = vif_to_sdata(vif);
 853                 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
 854         } else {
 855                 list_for_each_entry_rcu(sdata, &local->interfaces, list)
 856                         _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
 857         }
 858 }
 859 EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
 860
 861 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
 862                                       struct list_head *keys)
 863 {
 864         struct ieee80211_key *key, *tmp;
 865
 866         decrease_tailroom_need_count(sdata,
 867                                      sdata->crypto_tx_tailroom_pending_dec);
 868         sdata->crypto_tx_tailroom_pending_dec = 0;
 869
 870         ieee80211_debugfs_key_remove_mgmt_default(sdata);
 871
 872         list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
 873                 ieee80211_key_replace(key->sdata, key->sta,
 874                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 875                                 key, NULL);
 876                 list_add_tail(&key->list, keys);
 877         }
 878
 879         ieee80211_debugfs_key_update_default(sdata);
 880 }
 881
 882 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
 883                          bool force_synchronize)
 884 {
 885         struct ieee80211_local *local = sdata->local;
 886         struct ieee80211_sub_if_data *vlan;
 887         struct ieee80211_sub_if_data *master;
 888         struct ieee80211_key *key, *tmp;
 889         LIST_HEAD(keys);
 890
 891         cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
 892
 893         mutex_lock(&local->key_mtx);
 894
 895         ieee80211_free_keys_iface(sdata, &keys);
 896
 897         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 898                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 899                         ieee80211_free_keys_iface(vlan, &keys);
 900         }
 901
 902         if (!list_empty(&keys) || force_synchronize)
 903                 synchronize_net();
 904         list_for_each_entry_safe(key, tmp, &keys, list)
 905                 __ieee80211_key_destroy(key, false);
 906
 907         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 908                 if (sdata->bss) {
 909                         master = container_of(sdata->bss,
 910                                               struct ieee80211_sub_if_data,
 911                                               u.ap);
 912
 913                         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
 914                                      master->crypto_tx_tailroom_needed_cnt);
 915                 }
 916         } else {
 917                 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
 918                              sdata->crypto_tx_tailroom_pending_dec);
 919         }
 920
 921         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 922                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 923                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
 924                                      vlan->crypto_tx_tailroom_pending_dec);
 925         }
 926
 927         mutex_unlock(&local->key_mtx);
 928 }
 929
 930 void ieee80211_free_sta_keys(struct ieee80211_local *local,
 931                              struct sta_info *sta)
 932 {
 933         struct ieee80211_key *key;
 934         int i;
 935
 936         mutex_lock(&local->key_mtx);
 937         for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) {
 938                 key = key_mtx_dereference(local, sta->gtk[i]);
 939                 if (!key)
 940                         continue;
 941                 ieee80211_key_replace(key->sdata, key->sta,
 942                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 943                                 key, NULL);
 944                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
 945                                         NL80211_IFTYPE_STATION);
 946         }
 947
 948         for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
 949                 key = key_mtx_dereference(local, sta->ptk[i]);
 950                 if (!key)
 951                         continue;
 952                 ieee80211_key_replace(key->sdata, key->sta,
 953                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 954                                 key, NULL);
 955                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
 956                                         NL80211_IFTYPE_STATION);
 957         }
 958
 959         mutex_unlock(&local->key_mtx);
 960 }
 961
 962 void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
 963 {
 964         struct ieee80211_sub_if_data *sdata;
 965
 966         sdata = container_of(wk, struct ieee80211_sub_if_data,
 967                              dec_tailroom_needed_wk.work);
 968
 969         /*
 970          * The reason for the delayed tailroom needed decrementing is to
 971          * make roaming faster: during roaming, all keys are first deleted
 972          * and then new keys are installed. The first new key causes the
 973          * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
 974          * the cost of synchronize_net() (which can be slow). Avoid this
 975          * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
 976          * key removal for a while, so if we roam the value is larger than
 977          * zero and no 0->1 transition happens.
 978          *
 979          * The cost is that if the AP switching was from an AP with keys
 980          * to one without, we still allocate tailroom while it would no
 981          * longer be needed. However, in the typical (fast) roaming case
 982          * within an ESS this usually won't happen.
 983          */
 984
 985         mutex_lock(&sdata->local->key_mtx);
 986         decrease_tailroom_need_count(sdata,
 987                                      sdata->crypto_tx_tailroom_pending_dec);
 988         sdata->crypto_tx_tailroom_pending_dec = 0;
 989         mutex_unlock(&sdata->local->key_mtx);
 990 }
 991
 992 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
 993                                 const u8 *replay_ctr, gfp_t gfp)
 994 {
 995         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 996
 997         trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
 998
 999         cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
1000 }
1001 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
1002
1003 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
1004                               int tid, struct ieee80211_key_seq *seq)
1005 {
1006         struct ieee80211_key *key;
1007         const u8 *pn;
1008
1009         key = container_of(keyconf, struct ieee80211_key, conf);
1010
1011         switch (key->conf.cipher) {
1012         case WLAN_CIPHER_SUITE_TKIP:
1013                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1014                         return;
1015                 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
1016                 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
1017                 break;
1018         case WLAN_CIPHER_SUITE_CCMP:
1019         case WLAN_CIPHER_SUITE_CCMP_256:
1020                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1021                         return;
1022                 if (tid < 0)
1023                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1024                 else
1025                         pn = key->u.ccmp.rx_pn[tid];
1026                 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
1027                 break;
1028         case WLAN_CIPHER_SUITE_AES_CMAC:
1029         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1030                 if (WARN_ON(tid != 0))
1031                         return;
1032                 pn = key->u.aes_cmac.rx_pn;
1033                 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
1034                 break;
1035         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1036         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1037                 if (WARN_ON(tid != 0))
1038                         return;
1039                 pn = key->u.aes_gmac.rx_pn;
1040                 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
1041                 break;
1042         case WLAN_CIPHER_SUITE_GCMP:
1043         case WLAN_CIPHER_SUITE_GCMP_256:
1044                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1045                         return;
1046                 if (tid < 0)
1047                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1048                 else
1049                         pn = key->u.gcmp.rx_pn[tid];
1050                 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
1051                 break;
1052         }
1053 }
1054 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
1055
1056 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1057                               int tid, struct ieee80211_key_seq *seq)
1058 {
1059         struct ieee80211_key *key;
1060         u8 *pn;
1061
1062         key = container_of(keyconf, struct ieee80211_key, conf);
1063
1064         switch (key->conf.cipher) {
1065         case WLAN_CIPHER_SUITE_TKIP:
1066                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1067                         return;
1068                 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1069                 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1070                 break;
1071         case WLAN_CIPHER_SUITE_CCMP:
1072         case WLAN_CIPHER_SUITE_CCMP_256:
1073                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1074                         return;
1075                 if (tid < 0)
1076                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1077                 else
1078                         pn = key->u.ccmp.rx_pn[tid];
1079                 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1080                 break;
1081         case WLAN_CIPHER_SUITE_AES_CMAC:
1082         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1083                 if (WARN_ON(tid != 0))
1084                         return;
1085                 pn = key->u.aes_cmac.rx_pn;
1086                 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1087                 break;
1088         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1089         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1090                 if (WARN_ON(tid != 0))
1091                         return;
1092                 pn = key->u.aes_gmac.rx_pn;
1093                 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1094                 break;
1095         case WLAN_CIPHER_SUITE_GCMP:
1096         case WLAN_CIPHER_SUITE_GCMP_256:
1097                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1098                         return;
1099                 if (tid < 0)
1100                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1101                 else
1102                         pn = key->u.gcmp.rx_pn[tid];
1103                 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1104                 break;
1105         default:
1106                 WARN_ON(1);
1107                 break;
1108         }
1109 }
1110 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1111
1112 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1113 {
1114         struct ieee80211_key *key;
1115
1116         key = container_of(keyconf, struct ieee80211_key, conf);
1117
1118         assert_key_lock(key->local);
1119
1120         /*
1121          * if key was uploaded, we assume the driver will/has remove(d)
1122          * it, so adjust bookkeeping accordingly
1123          */
1124         if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1125                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1126
1127                 if (!((key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
1128                                            IEEE80211_KEY_FLAG_PUT_MIC_SPACE)) ||
1129                       (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1130                         increment_tailroom_need_count(key->sdata);
1131         }
1132
1133         ieee80211_key_free(key, false);
1134 }
1135 EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1136
1137 struct ieee80211_key_conf *
1138 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1139                         struct ieee80211_key_conf *keyconf)
1140 {
1141         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1142         struct ieee80211_local *local = sdata->local;
1143         struct ieee80211_key *key;
1144         int err;
1145
1146         if (WARN_ON(!local->wowlan))
1147                 return ERR_PTR(-EINVAL);
1148
1149         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1150                 return ERR_PTR(-EINVAL);
1151
1152         key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1153                                   keyconf->keylen, keyconf->key,
1154                                   0, NULL, NULL);
1155         if (IS_ERR(key))
1156                 return ERR_CAST(key);
1157
1158         if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1159                 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1160
1161         err = ieee80211_key_link(key, sdata, NULL);
1162         if (err)
1163                 return ERR_PTR(err);
1164
1165         return &key->conf;
1166 }
1167 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);