net/mac80211/key.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2002-2005, Instant802 Networks, Inc.
   4  * Copyright 2005-2006, Devicescape Software, Inc.
   5  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   6  * Copyright 2007-2008  Johannes Berg <johannes@sipsolutions.net>
   7  * Copyright 2013-2014  Intel Mobile Communications GmbH
   8  * Copyright 2015-2017  Intel Deutschland GmbH
   9  * Copyright 2018-2020  Intel Corporation
  10  */
  11
  12 #include <linux/if_ether.h>
  13 #include <linux/etherdevice.h>
  14 #include <linux/list.h>
  15 #include <linux/rcupdate.h>
  16 #include <linux/rtnetlink.h>
  17 #include <linux/slab.h>
  18 #include <linux/export.h>
  19 #include <net/mac80211.h>
  20 #include <crypto/algapi.h>
  21 #include <asm/unaligned.h>
  22 #include "ieee80211_i.h"
  23 #include "driver-ops.h"
  24 #include "debugfs_key.h"
  25 #include "aes_ccm.h"
  26 #include "aes_cmac.h"
  27 #include "aes_gmac.h"
  28 #include "aes_gcm.h"
  29
  30
  31 /**
  32  * DOC: Key handling basics
  33  *
  34  * Key handling in mac80211 is done based on per-interface (sub_if_data)
  35  * keys and per-station keys. Since each station belongs to an interface,
  36  * each station key also belongs to that interface.
  37  *
  38  * Hardware acceleration is done on a best-effort basis for algorithms
  39  * that are implemented in software,  for each key the hardware is asked
  40  * to enable that key for offloading but if it cannot do that the key is
  41  * simply kept for software encryption (unless it is for an algorithm
  42  * that isn't implemented in software).
  43  * There is currently no way of knowing whether a key is handled in SW
  44  * or HW except by looking into debugfs.
  45  *
  46  * All key management is internally protected by a mutex. Within all
  47  * other parts of mac80211, key references are, just as STA structure
  48  * references, protected by RCU. Note, however, that some things are
  49  * unprotected, namely the key->sta dereferences within the hardware
  50  * acceleration functions. This means that sta_info_destroy() must
  51  * remove the key which waits for an RCU grace period.
  52  */
  53
  54 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
  55
  56 static void assert_key_lock(struct ieee80211_local *local)
  57 {
  58         lockdep_assert_held(&local->key_mtx);
  59 }
  60
  61 static void
  62 update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta)
  63 {
  64         struct ieee80211_sub_if_data *vlan;
  65
  66         if (sdata->vif.type != NL80211_IFTYPE_AP)
  67                 return;
  68
  69         /* crypto_tx_tailroom_needed_cnt is protected by this */
  70         assert_key_lock(sdata->local);
  71
  72         rcu_read_lock();
  73
  74         list_for_each_entry_rcu(vlan, &sdata->u.ap.vlans, u.vlan.list)
  75                 vlan->crypto_tx_tailroom_needed_cnt += delta;
  76
  77         rcu_read_unlock();
  78 }
  79
  80 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
  81 {
  82         /*
  83          * When this count is zero, SKB resizing for allocating tailroom
  84          * for IV or MMIC is skipped. But, this check has created two race
  85          * cases in xmit path while transiting from zero count to one:
  86          *
  87          * 1. SKB resize was skipped because no key was added but just before
  88          * the xmit key is added and SW encryption kicks off.
  89          *
  90          * 2. SKB resize was skipped because all the keys were hw planted but
  91          * just before xmit one of the key is deleted and SW encryption kicks
  92          * off.
  93          *
  94          * In both the above case SW encryption will find not enough space for
  95          * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
  96          *
  97          * Solution has been explained at
  98          * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
  99          */
 100
 101         assert_key_lock(sdata->local);
 102
 103         update_vlan_tailroom_need_count(sdata, 1);
 104
 105         if (!sdata->crypto_tx_tailroom_needed_cnt++) {
 106                 /*
 107                  * Flush all XMIT packets currently using HW encryption or no
 108                  * encryption at all if the count transition is from 0 -> 1.
 109                  */
 110                 synchronize_net();
 111         }
 112 }
 113
 114 static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata,
 115                                          int delta)
 116 {
 117         assert_key_lock(sdata->local);
 118
 119         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta);
 120
 121         update_vlan_tailroom_need_count(sdata, -delta);
 122         sdata->crypto_tx_tailroom_needed_cnt -= delta;
 123 }
 124
 125 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
 126 {
 127         struct ieee80211_sub_if_data *sdata = key->sdata;
 128         struct sta_info *sta;
 129         int ret = -EOPNOTSUPP;
 130
 131         might_sleep();
 132
 133         if (key->flags & KEY_FLAG_TAINTED) {
 134                 /* If we get here, it's during resume and the key is
 135                  * tainted so shouldn't be used/programmed any more.
 136                  * However, its flags may still indicate that it was
 137                  * programmed into the device (since we're in resume)
 138                  * so clear that flag now to avoid trying to remove
 139                  * it again later.
 140                  */
 141                 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE &&
 142                     !(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
 143                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
 144                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 145                         increment_tailroom_need_count(sdata);
 146
 147                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 148                 return -EINVAL;
 149         }
 150
 151         if (!key->local->ops->set_key)
 152                 goto out_unsupported;
 153
 154         assert_key_lock(key->local);
 155
 156         sta = key->sta;
 157
 158         /*
 159          * If this is a per-STA GTK, check if it
 160          * is supported; if not, return.
 161          */
 162         if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) &&
 163             !ieee80211_hw_check(&key->local->hw, SUPPORTS_PER_STA_GTK))
 164                 goto out_unsupported;
 165
 166         if (sta && !sta->uploaded)
 167                 goto out_unsupported;
 168
 169         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 170                 /*
 171                  * The driver doesn't know anything about VLAN interfaces.
 172                  * Hence, don't send GTKs for VLAN interfaces to the driver.
 173                  */
 174                 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
 175                         ret = 1;
 176                         goto out_unsupported;
 177                 }
 178         }
 179
 180         ret = drv_set_key(key->local, SET_KEY, sdata,
 181                           sta ? &sta->sta : NULL, &key->conf);
 182
 183         if (!ret) {
 184                 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
 185
 186                 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
 187                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
 188                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 189                         decrease_tailroom_need_count(sdata, 1);
 190
 191                 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
 192                         (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
 193
 194                 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) &&
 195                         (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC));
 196
 197                 return 0;
 198         }
 199
 200         if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1)
 201                 sdata_err(sdata,
 202                           "failed to set key (%d, %pM) to hardware (%d)\n",
 203                           key->conf.keyidx,
 204                           sta ? sta->sta.addr : bcast_addr, ret);
 205
 206  out_unsupported:
 207         switch (key->conf.cipher) {
 208         case WLAN_CIPHER_SUITE_WEP40:
 209         case WLAN_CIPHER_SUITE_WEP104:
 210         case WLAN_CIPHER_SUITE_TKIP:
 211         case WLAN_CIPHER_SUITE_CCMP:
 212         case WLAN_CIPHER_SUITE_CCMP_256:
 213         case WLAN_CIPHER_SUITE_AES_CMAC:
 214         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 215         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 216         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 217         case WLAN_CIPHER_SUITE_GCMP:
 218         case WLAN_CIPHER_SUITE_GCMP_256:
 219                 /* all of these we can do in software - if driver can */
 220                 if (ret == 1)
 221                         return 0;
 222                 if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL))
 223                         return -EINVAL;
 224                 return 0;
 225         default:
 226                 return -EINVAL;
 227         }
 228 }
 229
 230 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
 231 {
 232         struct ieee80211_sub_if_data *sdata;
 233         struct sta_info *sta;
 234         int ret;
 235
 236         might_sleep();
 237
 238         if (!key || !key->local->ops->set_key)
 239                 return;
 240
 241         assert_key_lock(key->local);
 242
 243         if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 244                 return;
 245
 246         sta = key->sta;
 247         sdata = key->sdata;
 248
 249         if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
 250                                  IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
 251                                  IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 252                 increment_tailroom_need_count(sdata);
 253
 254         key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 255         ret = drv_set_key(key->local, DISABLE_KEY, sdata,
 256                           sta ? &sta->sta : NULL, &key->conf);
 257
 258         if (ret)
 259                 sdata_err(sdata,
 260                           "failed to remove key (%d, %pM) from hardware (%d)\n",
 261                           key->conf.keyidx,
 262                           sta ? sta->sta.addr : bcast_addr, ret);
 263 }
 264
 265 static int _ieee80211_set_tx_key(struct ieee80211_key *key, bool force)
 266 {
 267         struct sta_info *sta = key->sta;
 268         struct ieee80211_local *local = key->local;
 269
 270         assert_key_lock(local);
 271
 272         set_sta_flag(sta, WLAN_STA_USES_ENCRYPTION);
 273
 274         sta->ptk_idx = key->conf.keyidx;
 275
 276         if (force || !ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT))
 277                 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
 278         ieee80211_check_fast_xmit(sta);
 279
 280         return 0;
 281 }
 282
 283 int ieee80211_set_tx_key(struct ieee80211_key *key)
 284 {
 285         return _ieee80211_set_tx_key(key, false);
 286 }
 287
 288 static void ieee80211_pairwise_rekey(struct ieee80211_key *old,
 289                                      struct ieee80211_key *new)
 290 {
 291         struct ieee80211_local *local = new->local;
 292         struct sta_info *sta = new->sta;
 293         int i;
 294
 295         assert_key_lock(local);
 296
 297         if (new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX) {
 298                 /* Extended Key ID key install, initial one or rekey */
 299
 300                 if (sta->ptk_idx != INVALID_PTK_KEYIDX &&
 301                     !ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT)) {
 302                         /* Aggregation Sessions with Extended Key ID must not
 303                          * mix MPDUs with different keyIDs within one A-MPDU.
 304                          * Tear down running Tx aggregation sessions and block
 305                          * new Rx/Tx aggregation requests during rekey to
 306                          * ensure there are no A-MPDUs when the driver is not
 307                          * supporting A-MPDU key borders. (Blocking Tx only
 308                          * would be sufficient but WLAN_STA_BLOCK_BA gets the
 309                          * job done for the few ms we need it.)
 310                          */
 311                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
 312                         mutex_lock(&sta->ampdu_mlme.mtx);
 313                         for (i = 0; i <  IEEE80211_NUM_TIDS; i++)
 314                                 ___ieee80211_stop_tx_ba_session(sta, i,
 315                                                                 AGG_STOP_LOCAL_REQUEST);
 316                         mutex_unlock(&sta->ampdu_mlme.mtx);
 317                 }
 318         } else if (old) {
 319                 /* Rekey without Extended Key ID.
 320                  * Aggregation sessions are OK when running on SW crypto.
 321                  * A broken remote STA may cause issues not observed with HW
 322                  * crypto, though.
 323                  */
 324                 if (!(old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 325                         return;
 326
 327                 /* Stop Tx till we are on the new key */
 328                 old->flags |= KEY_FLAG_TAINTED;
 329                 ieee80211_clear_fast_xmit(sta);
 330                 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
 331                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
 332                         ieee80211_sta_tear_down_BA_sessions(sta,
 333                                                             AGG_STOP_LOCAL_REQUEST);
 334                 }
 335                 if (!wiphy_ext_feature_isset(local->hw.wiphy,
 336                                              NL80211_EXT_FEATURE_CAN_REPLACE_PTK0)) {
 337                         pr_warn_ratelimited("Rekeying PTK for STA %pM but driver can't safely do that.",
 338                                             sta->sta.addr);
 339                         /* Flushing the driver queues *may* help prevent
 340                          * the clear text leaks and freezes.
 341                          */
 342                         ieee80211_flush_queues(local, old->sdata, false);
 343                 }
 344         }
 345 }
 346
 347 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
 348                                         int idx, bool uni, bool multi)
 349 {
 350         struct ieee80211_key *key = NULL;
 351
 352         assert_key_lock(sdata->local);
 353
 354         if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
 355                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 356
 357         if (uni) {
 358                 rcu_assign_pointer(sdata->default_unicast_key, key);
 359                 ieee80211_check_fast_xmit_iface(sdata);
 360                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
 361                         drv_set_default_unicast_key(sdata->local, sdata, idx);
 362         }
 363
 364         if (multi)
 365                 rcu_assign_pointer(sdata->default_multicast_key, key);
 366
 367         ieee80211_debugfs_key_update_default(sdata);
 368 }
 369
 370 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
 371                                bool uni, bool multi)
 372 {
 373         mutex_lock(&sdata->local->key_mtx);
 374         __ieee80211_set_default_key(sdata, idx, uni, multi);
 375         mutex_unlock(&sdata->local->key_mtx);
 376 }
 377
 378 static void
 379 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
 380 {
 381         struct ieee80211_key *key = NULL;
 382
 383         assert_key_lock(sdata->local);
 384
 385         if (idx >= NUM_DEFAULT_KEYS &&
 386             idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
 387                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 388
 389         rcu_assign_pointer(sdata->default_mgmt_key, key);
 390
 391         ieee80211_debugfs_key_update_default(sdata);
 392 }
 393
 394 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
 395                                     int idx)
 396 {
 397         mutex_lock(&sdata->local->key_mtx);
 398         __ieee80211_set_default_mgmt_key(sdata, idx);
 399         mutex_unlock(&sdata->local->key_mtx);
 400 }
 401
 402 static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
 403                                   struct sta_info *sta,
 404                                   bool pairwise,
 405                                   struct ieee80211_key *old,
 406                                   struct ieee80211_key *new)
 407 {
 408         int idx;
 409         int ret = 0;
 410         bool defunikey, defmultikey, defmgmtkey;
 411
 412         /* caller must provide at least one old/new */
 413         if (WARN_ON(!new && !old))
 414                 return 0;
 415
 416         if (new)
 417                 list_add_tail_rcu(&new->list, &sdata->key_list);
 418
 419         WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
 420
 421         if (new && sta && pairwise) {
 422                 /* Unicast rekey needs special handling. With Extended Key ID
 423                  * old is still NULL for the first rekey.
 424                  */
 425                 ieee80211_pairwise_rekey(old, new);
 426         }
 427
 428         if (old) {
 429                 idx = old->conf.keyidx;
 430
 431                 if (old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
 432                         ieee80211_key_disable_hw_accel(old);
 433
 434                         if (new)
 435                                 ret = ieee80211_key_enable_hw_accel(new);
 436                 }
 437         } else {
 438                 /* new must be provided in case old is not */
 439                 idx = new->conf.keyidx;
 440                 if (!new->local->wowlan)
 441                         ret = ieee80211_key_enable_hw_accel(new);
 442         }
 443
 444         if (ret)
 445                 return ret;
 446
 447         if (sta) {
 448                 if (pairwise) {
 449                         rcu_assign_pointer(sta->ptk[idx], new);
 450                         if (new &&
 451                             !(new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX))
 452                                 _ieee80211_set_tx_key(new, true);
 453                 } else {
 454                         rcu_assign_pointer(sta->gtk[idx], new);
 455                 }
 456                 /* Only needed for transition from no key -> key.
 457                  * Still triggers unnecessary when using Extended Key ID
 458                  * and installing the second key ID the first time.
 459                  */
 460                 if (new && !old)
 461                         ieee80211_check_fast_rx(sta);
 462         } else {
 463                 defunikey = old &&
 464                         old == key_mtx_dereference(sdata->local,
 465                                                 sdata->default_unicast_key);
 466                 defmultikey = old &&
 467                         old == key_mtx_dereference(sdata->local,
 468                                                 sdata->default_multicast_key);
 469                 defmgmtkey = old &&
 470                         old == key_mtx_dereference(sdata->local,
 471                                                 sdata->default_mgmt_key);
 472
 473                 if (defunikey && !new)
 474                         __ieee80211_set_default_key(sdata, -1, true, false);
 475                 if (defmultikey && !new)
 476                         __ieee80211_set_default_key(sdata, -1, false, true);
 477                 if (defmgmtkey && !new)
 478                         __ieee80211_set_default_mgmt_key(sdata, -1);
 479
 480                 rcu_assign_pointer(sdata->keys[idx], new);
 481                 if (defunikey && new)
 482                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 483                                                     true, false);
 484                 if (defmultikey && new)
 485                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 486                                                     false, true);
 487                 if (defmgmtkey && new)
 488                         __ieee80211_set_default_mgmt_key(sdata,
 489                                                          new->conf.keyidx);
 490         }
 491
 492         if (old)
 493                 list_del_rcu(&old->list);
 494
 495         return 0;
 496 }
 497
 498 struct ieee80211_key *
 499 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
 500                     const u8 *key_data,
 501                     size_t seq_len, const u8 *seq,
 502                     const struct ieee80211_cipher_scheme *cs)
 503 {
 504         struct ieee80211_key *key;
 505         int i, j, err;
 506
 507         if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS))
 508                 return ERR_PTR(-EINVAL);
 509
 510         key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
 511         if (!key)
 512                 return ERR_PTR(-ENOMEM);
 513
 514         /*
 515          * Default to software encryption; we'll later upload the
 516          * key to the hardware if possible.
 517          */
 518         key->conf.flags = 0;
 519         key->flags = 0;
 520
 521         key->conf.cipher = cipher;
 522         key->conf.keyidx = idx;
 523         key->conf.keylen = key_len;
 524         switch (cipher) {
 525         case WLAN_CIPHER_SUITE_WEP40:
 526         case WLAN_CIPHER_SUITE_WEP104:
 527                 key->conf.iv_len = IEEE80211_WEP_IV_LEN;
 528                 key->conf.icv_len = IEEE80211_WEP_ICV_LEN;
 529                 break;
 530         case WLAN_CIPHER_SUITE_TKIP:
 531                 key->conf.iv_len = IEEE80211_TKIP_IV_LEN;
 532                 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN;
 533                 if (seq) {
 534                         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
 535                                 key->u.tkip.rx[i].iv32 =
 536                                         get_unaligned_le32(&seq[2]);
 537                                 key->u.tkip.rx[i].iv16 =
 538                                         get_unaligned_le16(seq);
 539                         }
 540                 }
 541                 spin_lock_init(&key->u.tkip.txlock);
 542                 break;
 543         case WLAN_CIPHER_SUITE_CCMP:
 544                 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN;
 545                 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN;
 546                 if (seq) {
 547                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 548                                 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++)
 549                                         key->u.ccmp.rx_pn[i][j] =
 550                                                 seq[IEEE80211_CCMP_PN_LEN - j - 1];
 551                 }
 552                 /*
 553                  * Initialize AES key state here as an optimization so that
 554                  * it does not need to be initialized for every packet.
 555                  */
 556                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 557                         key_data, key_len, IEEE80211_CCMP_MIC_LEN);
 558                 if (IS_ERR(key->u.ccmp.tfm)) {
 559                         err = PTR_ERR(key->u.ccmp.tfm);
 560                         kfree(key);
 561                         return ERR_PTR(err);
 562                 }
 563                 break;
 564         case WLAN_CIPHER_SUITE_CCMP_256:
 565                 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN;
 566                 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN;
 567                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 568                         for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++)
 569                                 key->u.ccmp.rx_pn[i][j] =
 570                                         seq[IEEE80211_CCMP_256_PN_LEN - j - 1];
 571                 /* Initialize AES key state here as an optimization so that
 572                  * it does not need to be initialized for every packet.
 573                  */
 574                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 575                         key_data, key_len, IEEE80211_CCMP_256_MIC_LEN);
 576                 if (IS_ERR(key->u.ccmp.tfm)) {
 577                         err = PTR_ERR(key->u.ccmp.tfm);
 578                         kfree(key);
 579                         return ERR_PTR(err);
 580                 }
 581                 break;
 582         case WLAN_CIPHER_SUITE_AES_CMAC:
 583         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 584                 key->conf.iv_len = 0;
 585                 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
 586                         key->conf.icv_len = sizeof(struct ieee80211_mmie);
 587                 else
 588                         key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 589                 if (seq)
 590                         for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
 591                                 key->u.aes_cmac.rx_pn[j] =
 592                                         seq[IEEE80211_CMAC_PN_LEN - j - 1];
 593                 /*
 594                  * Initialize AES key state here as an optimization so that
 595                  * it does not need to be initialized for every packet.
 596                  */
 597                 key->u.aes_cmac.tfm =
 598                         ieee80211_aes_cmac_key_setup(key_data, key_len);
 599                 if (IS_ERR(key->u.aes_cmac.tfm)) {
 600                         err = PTR_ERR(key->u.aes_cmac.tfm);
 601                         kfree(key);
 602                         return ERR_PTR(err);
 603                 }
 604                 break;
 605         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 606         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 607                 key->conf.iv_len = 0;
 608                 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 609                 if (seq)
 610                         for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++)
 611                                 key->u.aes_gmac.rx_pn[j] =
 612                                         seq[IEEE80211_GMAC_PN_LEN - j - 1];
 613                 /* Initialize AES key state here as an optimization so that
 614                  * it does not need to be initialized for every packet.
 615                  */
 616                 key->u.aes_gmac.tfm =
 617                         ieee80211_aes_gmac_key_setup(key_data, key_len);
 618                 if (IS_ERR(key->u.aes_gmac.tfm)) {
 619                         err = PTR_ERR(key->u.aes_gmac.tfm);
 620                         kfree(key);
 621                         return ERR_PTR(err);
 622                 }
 623                 break;
 624         case WLAN_CIPHER_SUITE_GCMP:
 625         case WLAN_CIPHER_SUITE_GCMP_256:
 626                 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
 627                 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
 628                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 629                         for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
 630                                 key->u.gcmp.rx_pn[i][j] =
 631                                         seq[IEEE80211_GCMP_PN_LEN - j - 1];
 632                 /* Initialize AES key state here as an optimization so that
 633                  * it does not need to be initialized for every packet.
 634                  */
 635                 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
 636                                                                       key_len);
 637                 if (IS_ERR(key->u.gcmp.tfm)) {
 638                         err = PTR_ERR(key->u.gcmp.tfm);
 639                         kfree(key);
 640                         return ERR_PTR(err);
 641                 }
 642                 break;
 643         default:
 644                 if (cs) {
 645                         if (seq_len && seq_len != cs->pn_len) {
 646                                 kfree(key);
 647                                 return ERR_PTR(-EINVAL);
 648                         }
 649
 650                         key->conf.iv_len = cs->hdr_len;
 651                         key->conf.icv_len = cs->mic_len;
 652                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 653                                 for (j = 0; j < seq_len; j++)
 654                                         key->u.gen.rx_pn[i][j] =
 655                                                         seq[seq_len - j - 1];
 656                         key->flags |= KEY_FLAG_CIPHER_SCHEME;
 657                 }
 658         }
 659         memcpy(key->conf.key, key_data, key_len);
 660         INIT_LIST_HEAD(&key->list);
 661
 662         return key;
 663 }
 664
 665 static void ieee80211_key_free_common(struct ieee80211_key *key)
 666 {
 667         switch (key->conf.cipher) {
 668         case WLAN_CIPHER_SUITE_CCMP:
 669         case WLAN_CIPHER_SUITE_CCMP_256:
 670                 ieee80211_aes_key_free(key->u.ccmp.tfm);
 671                 break;
 672         case WLAN_CIPHER_SUITE_AES_CMAC:
 673         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 674                 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
 675                 break;
 676         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 677         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 678                 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm);
 679                 break;
 680         case WLAN_CIPHER_SUITE_GCMP:
 681         case WLAN_CIPHER_SUITE_GCMP_256:
 682                 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
 683                 break;
 684         }
 685         kzfree(key);
 686 }
 687
 688 static void __ieee80211_key_destroy(struct ieee80211_key *key,
 689                                     bool delay_tailroom)
 690 {
 691         if (key->local) {
 692                 struct ieee80211_sub_if_data *sdata = key->sdata;
 693
 694                 ieee80211_debugfs_key_remove(key);
 695
 696                 if (delay_tailroom) {
 697                         /* see ieee80211_delayed_tailroom_dec */
 698                         sdata->crypto_tx_tailroom_pending_dec++;
 699                         schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
 700                                               HZ/2);
 701                 } else {
 702                         decrease_tailroom_need_count(sdata, 1);
 703                 }
 704         }
 705
 706         ieee80211_key_free_common(key);
 707 }
 708
 709 static void ieee80211_key_destroy(struct ieee80211_key *key,
 710                                   bool delay_tailroom)
 711 {
 712         if (!key)
 713                 return;
 714
 715         /*
 716          * Synchronize so the TX path and rcu key iterators
 717          * can no longer be using this key before we free/remove it.
 718          */
 719         synchronize_net();
 720
 721         __ieee80211_key_destroy(key, delay_tailroom);
 722 }
 723
 724 void ieee80211_key_free_unused(struct ieee80211_key *key)
 725 {
 726         WARN_ON(key->sdata || key->local);
 727         ieee80211_key_free_common(key);
 728 }
 729
 730 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata,
 731                                     struct ieee80211_key *old,
 732                                     struct ieee80211_key *new)
 733 {
 734         u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP];
 735         u8 *tk_old, *tk_new;
 736
 737         if (!old || new->conf.keylen != old->conf.keylen)
 738                 return false;
 739
 740         tk_old = old->conf.key;
 741         tk_new = new->conf.key;
 742
 743         /*
 744          * In station mode, don't compare the TX MIC key, as it's never used
 745          * and offloaded rekeying may not care to send it to the host. This
 746          * is the case in iwlwifi, for example.
 747          */
 748         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 749             new->conf.cipher == WLAN_CIPHER_SUITE_TKIP &&
 750             new->conf.keylen == WLAN_KEY_LEN_TKIP &&
 751             !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
 752                 memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP);
 753                 memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP);
 754                 memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 755                 memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 756                 tk_old = tkip_old;
 757                 tk_new = tkip_new;
 758         }
 759
 760         return !crypto_memneq(tk_old, tk_new, new->conf.keylen);
 761 }
 762
 763 int ieee80211_key_link(struct ieee80211_key *key,
 764                        struct ieee80211_sub_if_data *sdata,
 765                        struct sta_info *sta)
 766 {
 767         static atomic_t key_color = ATOMIC_INIT(0);
 768         struct ieee80211_key *old_key;
 769         int idx = key->conf.keyidx;
 770         bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
 771         /*
 772          * We want to delay tailroom updates only for station - in that
 773          * case it helps roaming speed, but in other cases it hurts and
 774          * can cause warnings to appear.
 775          */
 776         bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION;
 777         int ret = -EOPNOTSUPP;
 778
 779         mutex_lock(&sdata->local->key_mtx);
 780
 781         if (sta && pairwise) {
 782                 struct ieee80211_key *alt_key;
 783
 784                 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
 785                 alt_key = key_mtx_dereference(sdata->local, sta->ptk[idx ^ 1]);
 786
 787                 /* The rekey code assumes that the old and new key are using
 788                  * the same cipher. Enforce the assumption for pairwise keys.
 789                  */
 790                 if ((alt_key && alt_key->conf.cipher != key->conf.cipher) ||
 791                     (old_key && old_key->conf.cipher != key->conf.cipher))
 792                         goto out;
 793         } else if (sta) {
 794                 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
 795         } else {
 796                 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 797         }
 798
 799         /* Non-pairwise keys must also not switch the cipher on rekey */
 800         if (!pairwise) {
 801                 if (old_key && old_key->conf.cipher != key->conf.cipher)
 802                         goto out;
 803         }
 804
 805         /*
 806          * Silently accept key re-installation without really installing the
 807          * new version of the key to avoid nonce reuse or replay issues.
 808          */
 809         if (ieee80211_key_identical(sdata, old_key, key)) {
 810                 ieee80211_key_free_unused(key);
 811                 ret = 0;
 812                 goto out;
 813         }
 814
 815         key->local = sdata->local;
 816         key->sdata = sdata;
 817         key->sta = sta;
 818
 819         /*
 820          * Assign a unique ID to every key so we can easily prevent mixed
 821          * key and fragment cache attacks.
 822          */
 823         key->color = atomic_inc_return(&key_color);
 824
 825         increment_tailroom_need_count(sdata);
 826
 827         ret = ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
 828
 829         if (!ret) {
 830                 ieee80211_debugfs_key_add(key);
 831                 ieee80211_key_destroy(old_key, delay_tailroom);
 832         } else {
 833                 ieee80211_key_free(key, delay_tailroom);
 834         }
 835
 836  out:
 837         mutex_unlock(&sdata->local->key_mtx);
 838
 839         return ret;
 840 }
 841
 842 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
 843 {
 844         if (!key)
 845                 return;
 846
 847         /*
 848          * Replace key with nothingness if it was ever used.
 849          */
 850         if (key->sdata)
 851                 ieee80211_key_replace(key->sdata, key->sta,
 852                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 853                                 key, NULL);
 854         ieee80211_key_destroy(key, delay_tailroom);
 855 }
 856
 857 void ieee80211_reenable_keys(struct ieee80211_sub_if_data *sdata)
 858 {
 859         struct ieee80211_key *key;
 860         struct ieee80211_sub_if_data *vlan;
 861
 862         ASSERT_RTNL();
 863
 864         mutex_lock(&sdata->local->key_mtx);
 865
 866         sdata->crypto_tx_tailroom_needed_cnt = 0;
 867         sdata->crypto_tx_tailroom_pending_dec = 0;
 868
 869         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 870                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
 871                         vlan->crypto_tx_tailroom_needed_cnt = 0;
 872                         vlan->crypto_tx_tailroom_pending_dec = 0;
 873                 }
 874         }
 875
 876         if (ieee80211_sdata_running(sdata)) {
 877                 list_for_each_entry(key, &sdata->key_list, list) {
 878                         increment_tailroom_need_count(sdata);
 879                         ieee80211_key_enable_hw_accel(key);
 880                 }
 881         }
 882
 883         mutex_unlock(&sdata->local->key_mtx);
 884 }
 885
 886 void ieee80211_iter_keys(struct ieee80211_hw *hw,
 887                          struct ieee80211_vif *vif,
 888                          void (*iter)(struct ieee80211_hw *hw,
 889                                       struct ieee80211_vif *vif,
 890                                       struct ieee80211_sta *sta,
 891                                       struct ieee80211_key_conf *key,
 892                                       void *data),
 893                          void *iter_data)
 894 {
 895         struct ieee80211_local *local = hw_to_local(hw);
 896         struct ieee80211_key *key, *tmp;
 897         struct ieee80211_sub_if_data *sdata;
 898
 899         ASSERT_RTNL();
 900
 901         mutex_lock(&local->key_mtx);
 902         if (vif) {
 903                 sdata = vif_to_sdata(vif);
 904                 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
 905                         iter(hw, &sdata->vif,
 906                              key->sta ? &key->sta->sta : NULL,
 907                              &key->conf, iter_data);
 908         } else {
 909                 list_for_each_entry(sdata, &local->interfaces, list)
 910                         list_for_each_entry_safe(key, tmp,
 911                                                  &sdata->key_list, list)
 912                                 iter(hw, &sdata->vif,
 913                                      key->sta ? &key->sta->sta : NULL,
 914                                      &key->conf, iter_data);
 915         }
 916         mutex_unlock(&local->key_mtx);
 917 }
 918 EXPORT_SYMBOL(ieee80211_iter_keys);
 919
 920 static void
 921 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
 922                          struct ieee80211_sub_if_data *sdata,
 923                          void (*iter)(struct ieee80211_hw *hw,
 924                                       struct ieee80211_vif *vif,
 925                                       struct ieee80211_sta *sta,
 926                                       struct ieee80211_key_conf *key,
 927                                       void *data),
 928                          void *iter_data)
 929 {
 930         struct ieee80211_key *key;
 931
 932         list_for_each_entry_rcu(key, &sdata->key_list, list) {
 933                 /* skip keys of station in removal process */
 934                 if (key->sta && key->sta->removed)
 935                         continue;
 936                 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 937                         continue;
 938
 939                 iter(hw, &sdata->vif,
 940                      key->sta ? &key->sta->sta : NULL,
 941                      &key->conf, iter_data);
 942         }
 943 }
 944
 945 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
 946                              struct ieee80211_vif *vif,
 947                              void (*iter)(struct ieee80211_hw *hw,
 948                                           struct ieee80211_vif *vif,
 949                                           struct ieee80211_sta *sta,
 950                                           struct ieee80211_key_conf *key,
 951                                           void *data),
 952                              void *iter_data)
 953 {
 954         struct ieee80211_local *local = hw_to_local(hw);
 955         struct ieee80211_sub_if_data *sdata;
 956
 957         if (vif) {
 958                 sdata = vif_to_sdata(vif);
 959                 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
 960         } else {
 961                 list_for_each_entry_rcu(sdata, &local->interfaces, list)
 962                         _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
 963         }
 964 }
 965 EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
 966
 967 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
 968                                       struct list_head *keys)
 969 {
 970         struct ieee80211_key *key, *tmp;
 971
 972         decrease_tailroom_need_count(sdata,
 973                                      sdata->crypto_tx_tailroom_pending_dec);
 974         sdata->crypto_tx_tailroom_pending_dec = 0;
 975
 976         ieee80211_debugfs_key_remove_mgmt_default(sdata);
 977
 978         list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
 979                 ieee80211_key_replace(key->sdata, key->sta,
 980                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 981                                 key, NULL);
 982                 list_add_tail(&key->list, keys);
 983         }
 984
 985         ieee80211_debugfs_key_update_default(sdata);
 986 }
 987
 988 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
 989                          bool force_synchronize)
 990 {
 991         struct ieee80211_local *local = sdata->local;
 992         struct ieee80211_sub_if_data *vlan;
 993         struct ieee80211_sub_if_data *master;
 994         struct ieee80211_key *key, *tmp;
 995         LIST_HEAD(keys);
 996
 997         cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
 998
 999         mutex_lock(&local->key_mtx);
1000
1001         ieee80211_free_keys_iface(sdata, &keys);
1002
1003         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1004                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1005                         ieee80211_free_keys_iface(vlan, &keys);
1006         }
1007
1008         if (!list_empty(&keys) || force_synchronize)
1009                 synchronize_net();
1010         list_for_each_entry_safe(key, tmp, &keys, list)
1011                 __ieee80211_key_destroy(key, false);
1012
1013         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1014                 if (sdata->bss) {
1015                         master = container_of(sdata->bss,
1016                                               struct ieee80211_sub_if_data,
1017                                               u.ap);
1018
1019                         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
1020                                      master->crypto_tx_tailroom_needed_cnt);
1021                 }
1022         } else {
1023                 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
1024                              sdata->crypto_tx_tailroom_pending_dec);
1025         }
1026
1027         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1028                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1029                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
1030                                      vlan->crypto_tx_tailroom_pending_dec);
1031         }
1032
1033         mutex_unlock(&local->key_mtx);
1034 }
1035
1036 void ieee80211_free_sta_keys(struct ieee80211_local *local,
1037                              struct sta_info *sta)
1038 {
1039         struct ieee80211_key *key;
1040         int i;
1041
1042         mutex_lock(&local->key_mtx);
1043         for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) {
1044                 key = key_mtx_dereference(local, sta->gtk[i]);
1045                 if (!key)
1046                         continue;
1047                 ieee80211_key_replace(key->sdata, key->sta,
1048                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1049                                 key, NULL);
1050                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1051                                         NL80211_IFTYPE_STATION);
1052         }
1053
1054         for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1055                 key = key_mtx_dereference(local, sta->ptk[i]);
1056                 if (!key)
1057                         continue;
1058                 ieee80211_key_replace(key->sdata, key->sta,
1059                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1060                                 key, NULL);
1061                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1062                                         NL80211_IFTYPE_STATION);
1063         }
1064
1065         mutex_unlock(&local->key_mtx);
1066 }
1067
1068 void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
1069 {
1070         struct ieee80211_sub_if_data *sdata;
1071
1072         sdata = container_of(wk, struct ieee80211_sub_if_data,
1073                              dec_tailroom_needed_wk.work);
1074
1075         /*
1076          * The reason for the delayed tailroom needed decrementing is to
1077          * make roaming faster: during roaming, all keys are first deleted
1078          * and then new keys are installed. The first new key causes the
1079          * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
1080          * the cost of synchronize_net() (which can be slow). Avoid this
1081          * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
1082          * key removal for a while, so if we roam the value is larger than
1083          * zero and no 0->1 transition happens.
1084          *
1085          * The cost is that if the AP switching was from an AP with keys
1086          * to one without, we still allocate tailroom while it would no
1087          * longer be needed. However, in the typical (fast) roaming case
1088          * within an ESS this usually won't happen.
1089          */
1090
1091         mutex_lock(&sdata->local->key_mtx);
1092         decrease_tailroom_need_count(sdata,
1093                                      sdata->crypto_tx_tailroom_pending_dec);
1094         sdata->crypto_tx_tailroom_pending_dec = 0;
1095         mutex_unlock(&sdata->local->key_mtx);
1096 }
1097
1098 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
1099                                 const u8 *replay_ctr, gfp_t gfp)
1100 {
1101         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1102
1103         trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
1104
1105         cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
1106 }
1107 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
1108
1109 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
1110                               int tid, struct ieee80211_key_seq *seq)
1111 {
1112         struct ieee80211_key *key;
1113         const u8 *pn;
1114
1115         key = container_of(keyconf, struct ieee80211_key, conf);
1116
1117         switch (key->conf.cipher) {
1118         case WLAN_CIPHER_SUITE_TKIP:
1119                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1120                         return;
1121                 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
1122                 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
1123                 break;
1124         case WLAN_CIPHER_SUITE_CCMP:
1125         case WLAN_CIPHER_SUITE_CCMP_256:
1126                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1127                         return;
1128                 if (tid < 0)
1129                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1130                 else
1131                         pn = key->u.ccmp.rx_pn[tid];
1132                 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
1133                 break;
1134         case WLAN_CIPHER_SUITE_AES_CMAC:
1135         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1136                 if (WARN_ON(tid != 0))
1137                         return;
1138                 pn = key->u.aes_cmac.rx_pn;
1139                 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
1140                 break;
1141         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1142         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1143                 if (WARN_ON(tid != 0))
1144                         return;
1145                 pn = key->u.aes_gmac.rx_pn;
1146                 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
1147                 break;
1148         case WLAN_CIPHER_SUITE_GCMP:
1149         case WLAN_CIPHER_SUITE_GCMP_256:
1150                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1151                         return;
1152                 if (tid < 0)
1153                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1154                 else
1155                         pn = key->u.gcmp.rx_pn[tid];
1156                 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
1157                 break;
1158         }
1159 }
1160 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
1161
1162 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1163                               int tid, struct ieee80211_key_seq *seq)
1164 {
1165         struct ieee80211_key *key;
1166         u8 *pn;
1167
1168         key = container_of(keyconf, struct ieee80211_key, conf);
1169
1170         switch (key->conf.cipher) {
1171         case WLAN_CIPHER_SUITE_TKIP:
1172                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1173                         return;
1174                 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1175                 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1176                 break;
1177         case WLAN_CIPHER_SUITE_CCMP:
1178         case WLAN_CIPHER_SUITE_CCMP_256:
1179                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1180                         return;
1181                 if (tid < 0)
1182                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1183                 else
1184                         pn = key->u.ccmp.rx_pn[tid];
1185                 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1186                 break;
1187         case WLAN_CIPHER_SUITE_AES_CMAC:
1188         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1189                 if (WARN_ON(tid != 0))
1190                         return;
1191                 pn = key->u.aes_cmac.rx_pn;
1192                 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1193                 break;
1194         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1195         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1196                 if (WARN_ON(tid != 0))
1197                         return;
1198                 pn = key->u.aes_gmac.rx_pn;
1199                 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1200                 break;
1201         case WLAN_CIPHER_SUITE_GCMP:
1202         case WLAN_CIPHER_SUITE_GCMP_256:
1203                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1204                         return;
1205                 if (tid < 0)
1206                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1207                 else
1208                         pn = key->u.gcmp.rx_pn[tid];
1209                 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1210                 break;
1211         default:
1212                 WARN_ON(1);
1213                 break;
1214         }
1215 }
1216 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1217
1218 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1219 {
1220         struct ieee80211_key *key;
1221
1222         key = container_of(keyconf, struct ieee80211_key, conf);
1223
1224         assert_key_lock(key->local);
1225
1226         /*
1227          * if key was uploaded, we assume the driver will/has remove(d)
1228          * it, so adjust bookkeeping accordingly
1229          */
1230         if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1231                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1232
1233                 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
1234                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
1235                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1236                         increment_tailroom_need_count(key->sdata);
1237         }
1238
1239         ieee80211_key_free(key, false);
1240 }
1241 EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1242
1243 struct ieee80211_key_conf *
1244 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1245                         struct ieee80211_key_conf *keyconf)
1246 {
1247         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1248         struct ieee80211_local *local = sdata->local;
1249         struct ieee80211_key *key;
1250         int err;
1251
1252         if (WARN_ON(!local->wowlan))
1253                 return ERR_PTR(-EINVAL);
1254
1255         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1256                 return ERR_PTR(-EINVAL);
1257
1258         key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1259                                   keyconf->keylen, keyconf->key,
1260                                   0, NULL, NULL);
1261         if (IS_ERR(key))
1262                 return ERR_CAST(key);
1263
1264         if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1265                 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1266
1267         err = ieee80211_key_link(key, sdata, NULL);
1268         if (err)
1269                 return ERR_PTR(err);
1270
1271         return &key->conf;
1272 }
1273 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);