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  */
  10
  11 #include <linux/if_ether.h>
  12 #include <linux/etherdevice.h>
  13 #include <linux/list.h>
  14 #include <linux/rcupdate.h>
  15 #include <linux/rtnetlink.h>
  16 #include <linux/slab.h>
  17 #include <linux/export.h>
  18 #include <net/mac80211.h>
  19 #include <crypto/algapi.h>
  20 #include <asm/unaligned.h>
  21 #include "ieee80211_i.h"
  22 #include "driver-ops.h"
  23 #include "debugfs_key.h"
  24 #include "aes_ccm.h"
  25 #include "aes_cmac.h"
  26 #include "aes_gmac.h"
  27 #include "aes_gcm.h"
  28
  29
  30 /**
  31  * DOC: Key handling basics
  32  *
  33  * Key handling in mac80211 is done based on per-interface (sub_if_data)
  34  * keys and per-station keys. Since each station belongs to an interface,
  35  * each station key also belongs to that interface.
  36  *
  37  * Hardware acceleration is done on a best-effort basis for algorithms
  38  * that are implemented in software,  for each key the hardware is asked
  39  * to enable that key for offloading but if it cannot do that the key is
  40  * simply kept for software encryption (unless it is for an algorithm
  41  * that isn't implemented in software).
  42  * There is currently no way of knowing whether a key is handled in SW
  43  * or HW except by looking into debugfs.
  44  *
  45  * All key management is internally protected by a mutex. Within all
  46  * other parts of mac80211, key references are, just as STA structure
  47  * references, protected by RCU. Note, however, that some things are
  48  * unprotected, namely the key->sta dereferences within the hardware
  49  * acceleration functions. This means that sta_info_destroy() must
  50  * remove the key which waits for an RCU grace period.
  51  */
  52
  53 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
  54
  55 static void assert_key_lock(struct ieee80211_local *local)
  56 {
  57         lockdep_assert_held(&local->key_mtx);
  58 }
  59
  60 static void
  61 update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta)
  62 {
  63         struct ieee80211_sub_if_data *vlan;
  64
  65         if (sdata->vif.type != NL80211_IFTYPE_AP)
  66                 return;
  67
  68         /* crypto_tx_tailroom_needed_cnt is protected by this */
  69         assert_key_lock(sdata->local);
  70
  71         rcu_read_lock();
  72
  73         list_for_each_entry_rcu(vlan, &sdata->u.ap.vlans, u.vlan.list)
  74                 vlan->crypto_tx_tailroom_needed_cnt += delta;
  75
  76         rcu_read_unlock();
  77 }
  78
  79 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
  80 {
  81         /*
  82          * When this count is zero, SKB resizing for allocating tailroom
  83          * for IV or MMIC is skipped. But, this check has created two race
  84          * cases in xmit path while transiting from zero count to one:
  85          *
  86          * 1. SKB resize was skipped because no key was added but just before
  87          * the xmit key is added and SW encryption kicks off.
  88          *
  89          * 2. SKB resize was skipped because all the keys were hw planted but
  90          * just before xmit one of the key is deleted and SW encryption kicks
  91          * off.
  92          *
  93          * In both the above case SW encryption will find not enough space for
  94          * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
  95          *
  96          * Solution has been explained at
  97          * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
  98          */
  99
 100         assert_key_lock(sdata->local);
 101
 102         update_vlan_tailroom_need_count(sdata, 1);
 103
 104         if (!sdata->crypto_tx_tailroom_needed_cnt++) {
 105                 /*
 106                  * Flush all XMIT packets currently using HW encryption or no
 107                  * encryption at all if the count transition is from 0 -> 1.
 108                  */
 109                 synchronize_net();
 110         }
 111 }
 112
 113 static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata,
 114                                          int delta)
 115 {
 116         assert_key_lock(sdata->local);
 117
 118         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta);
 119
 120         update_vlan_tailroom_need_count(sdata, -delta);
 121         sdata->crypto_tx_tailroom_needed_cnt -= delta;
 122 }
 123
 124 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
 125 {
 126         struct ieee80211_sub_if_data *sdata = key->sdata;
 127         struct sta_info *sta;
 128         int ret = -EOPNOTSUPP;
 129
 130         might_sleep();
 131
 132         if (key->flags & KEY_FLAG_TAINTED) {
 133                 /* If we get here, it's during resume and the key is
 134                  * tainted so shouldn't be used/programmed any more.
 135                  * However, its flags may still indicate that it was
 136                  * programmed into the device (since we're in resume)
 137                  * so clear that flag now to avoid trying to remove
 138                  * it again later.
 139                  */
 140                 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE &&
 141                     !(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
 142                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
 143                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 144                         increment_tailroom_need_count(sdata);
 145
 146                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 147                 return -EINVAL;
 148         }
 149
 150         if (!key->local->ops->set_key)
 151                 goto out_unsupported;
 152
 153         assert_key_lock(key->local);
 154
 155         sta = key->sta;
 156
 157         /*
 158          * If this is a per-STA GTK, check if it
 159          * is supported; if not, return.
 160          */
 161         if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) &&
 162             !ieee80211_hw_check(&key->local->hw, SUPPORTS_PER_STA_GTK))
 163                 goto out_unsupported;
 164
 165         if (sta && !sta->uploaded)
 166                 goto out_unsupported;
 167
 168         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 169                 /*
 170                  * The driver doesn't know anything about VLAN interfaces.
 171                  * Hence, don't send GTKs for VLAN interfaces to the driver.
 172                  */
 173                 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
 174                         ret = 1;
 175                         goto out_unsupported;
 176                 }
 177         }
 178
 179         ret = drv_set_key(key->local, SET_KEY, sdata,
 180                           sta ? &sta->sta : NULL, &key->conf);
 181
 182         if (!ret) {
 183                 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
 184
 185                 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
 186                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
 187                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 188                         decrease_tailroom_need_count(sdata, 1);
 189
 190                 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
 191                         (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
 192
 193                 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) &&
 194                         (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC));
 195
 196                 return 0;
 197         }
 198
 199         if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1)
 200                 sdata_err(sdata,
 201                           "failed to set key (%d, %pM) to hardware (%d)\n",
 202                           key->conf.keyidx,
 203                           sta ? sta->sta.addr : bcast_addr, ret);
 204
 205  out_unsupported:
 206         switch (key->conf.cipher) {
 207         case WLAN_CIPHER_SUITE_WEP40:
 208         case WLAN_CIPHER_SUITE_WEP104:
 209         case WLAN_CIPHER_SUITE_TKIP:
 210         case WLAN_CIPHER_SUITE_CCMP:
 211         case WLAN_CIPHER_SUITE_CCMP_256:
 212         case WLAN_CIPHER_SUITE_AES_CMAC:
 213         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 214         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 215         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 216         case WLAN_CIPHER_SUITE_GCMP:
 217         case WLAN_CIPHER_SUITE_GCMP_256:
 218                 /* all of these we can do in software - if driver can */
 219                 if (ret == 1)
 220                         return 0;
 221                 if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL))
 222                         return -EINVAL;
 223                 return 0;
 224         default:
 225                 return -EINVAL;
 226         }
 227 }
 228
 229 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
 230 {
 231         struct ieee80211_sub_if_data *sdata;
 232         struct sta_info *sta;
 233         int ret;
 234
 235         might_sleep();
 236
 237         if (!key || !key->local->ops->set_key)
 238                 return;
 239
 240         assert_key_lock(key->local);
 241
 242         if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 243                 return;
 244
 245         sta = key->sta;
 246         sdata = key->sdata;
 247
 248         if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
 249                                  IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
 250                                  IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 251                 increment_tailroom_need_count(sdata);
 252
 253         key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 254         ret = drv_set_key(key->local, DISABLE_KEY, sdata,
 255                           sta ? &sta->sta : NULL, &key->conf);
 256
 257         if (ret)
 258                 sdata_err(sdata,
 259                           "failed to remove key (%d, %pM) from hardware (%d)\n",
 260                           key->conf.keyidx,
 261                           sta ? sta->sta.addr : bcast_addr, ret);
 262 }
 263
 264 int ieee80211_set_tx_key(struct ieee80211_key *key)
 265 {
 266         struct sta_info *sta = key->sta;
 267         struct ieee80211_local *local = key->local;
 268
 269         assert_key_lock(local);
 270
 271         sta->ptk_idx = key->conf.keyidx;
 272
 273         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
 274         ieee80211_check_fast_xmit(sta);
 275
 276         return 0;
 277 }
 278
 279 static void ieee80211_pairwise_rekey(struct ieee80211_key *old,
 280                                      struct ieee80211_key *new)
 281 {
 282         struct ieee80211_local *local = new->local;
 283         struct sta_info *sta = new->sta;
 284         int i;
 285
 286         assert_key_lock(local);
 287
 288         if (new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX) {
 289                 /* Extended Key ID key install, initial one or rekey */
 290
 291                 if (sta->ptk_idx != INVALID_PTK_KEYIDX) {
 292                         /* Aggregation Sessions with Extended Key ID must not
 293                          * mix MPDUs with different keyIDs within one A-MPDU.
 294                          * Tear down running Tx aggregation sessions and block
 295                          * new Rx/Tx aggregation requests during rekey to
 296                          * ensure there are no A-MPDUs for the driver to
 297                          * aggregate. (Blocking Tx only would be sufficient but
 298                          * WLAN_STA_BLOCK_BA gets the job done for the few ms
 299                          * we need it.)
 300                          */
 301                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
 302                         mutex_lock(&sta->ampdu_mlme.mtx);
 303                         for (i = 0; i <  IEEE80211_NUM_TIDS; i++)
 304                                 ___ieee80211_stop_tx_ba_session(sta, i,
 305                                                                 AGG_STOP_LOCAL_REQUEST);
 306                         mutex_unlock(&sta->ampdu_mlme.mtx);
 307                 }
 308         } else if (old) {
 309                 /* Rekey without Extended Key ID.
 310                  * Aggregation sessions are OK when running on SW crypto.
 311                  * A broken remote STA may cause issues not observed with HW
 312                  * crypto, though.
 313                  */
 314                 if (!(old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 315                         return;
 316
 317                 /* Stop Tx till we are on the new key */
 318                 old->flags |= KEY_FLAG_TAINTED;
 319                 ieee80211_clear_fast_xmit(sta);
 320                 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
 321                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
 322                         ieee80211_sta_tear_down_BA_sessions(sta,
 323                                                             AGG_STOP_LOCAL_REQUEST);
 324                 }
 325                 if (!wiphy_ext_feature_isset(local->hw.wiphy,
 326                                              NL80211_EXT_FEATURE_CAN_REPLACE_PTK0)) {
 327                         pr_warn_ratelimited("Rekeying PTK for STA %pM but driver can't safely do that.",
 328                                             sta->sta.addr);
 329                         /* Flushing the driver queues *may* help prevent
 330                          * the clear text leaks and freezes.
 331                          */
 332                         ieee80211_flush_queues(local, old->sdata, false);
 333                 }
 334         }
 335 }
 336
 337 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
 338                                         int idx, bool uni, bool multi)
 339 {
 340         struct ieee80211_key *key = NULL;
 341
 342         assert_key_lock(sdata->local);
 343
 344         if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
 345                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 346
 347         if (uni) {
 348                 rcu_assign_pointer(sdata->default_unicast_key, key);
 349                 ieee80211_check_fast_xmit_iface(sdata);
 350                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
 351                         drv_set_default_unicast_key(sdata->local, sdata, idx);
 352         }
 353
 354         if (multi)
 355                 rcu_assign_pointer(sdata->default_multicast_key, key);
 356
 357         ieee80211_debugfs_key_update_default(sdata);
 358 }
 359
 360 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
 361                                bool uni, bool multi)
 362 {
 363         mutex_lock(&sdata->local->key_mtx);
 364         __ieee80211_set_default_key(sdata, idx, uni, multi);
 365         mutex_unlock(&sdata->local->key_mtx);
 366 }
 367
 368 static void
 369 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
 370 {
 371         struct ieee80211_key *key = NULL;
 372
 373         assert_key_lock(sdata->local);
 374
 375         if (idx >= NUM_DEFAULT_KEYS &&
 376             idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
 377                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 378
 379         rcu_assign_pointer(sdata->default_mgmt_key, key);
 380
 381         ieee80211_debugfs_key_update_default(sdata);
 382 }
 383
 384 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
 385                                     int idx)
 386 {
 387         mutex_lock(&sdata->local->key_mtx);
 388         __ieee80211_set_default_mgmt_key(sdata, idx);
 389         mutex_unlock(&sdata->local->key_mtx);
 390 }
 391
 392 static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
 393                                   struct sta_info *sta,
 394                                   bool pairwise,
 395                                   struct ieee80211_key *old,
 396                                   struct ieee80211_key *new)
 397 {
 398         int idx;
 399         int ret = 0;
 400         bool defunikey, defmultikey, defmgmtkey;
 401
 402         /* caller must provide at least one old/new */
 403         if (WARN_ON(!new && !old))
 404                 return 0;
 405
 406         if (new)
 407                 list_add_tail_rcu(&new->list, &sdata->key_list);
 408
 409         WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
 410
 411         if (new && sta && pairwise) {
 412                 /* Unicast rekey needs special handling. With Extended Key ID
 413                  * old is still NULL for the first rekey.
 414                  */
 415                 ieee80211_pairwise_rekey(old, new);
 416         }
 417
 418         if (old) {
 419                 idx = old->conf.keyidx;
 420
 421                 if (old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
 422                         ieee80211_key_disable_hw_accel(old);
 423
 424                         if (new)
 425                                 ret = ieee80211_key_enable_hw_accel(new);
 426                 }
 427         } else {
 428                 /* new must be provided in case old is not */
 429                 idx = new->conf.keyidx;
 430                 if (!new->local->wowlan)
 431                         ret = ieee80211_key_enable_hw_accel(new);
 432         }
 433
 434         if (ret)
 435                 return ret;
 436
 437         if (sta) {
 438                 if (pairwise) {
 439                         rcu_assign_pointer(sta->ptk[idx], new);
 440                         if (new &&
 441                             !(new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX)) {
 442                                 sta->ptk_idx = idx;
 443                                 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
 444                                 ieee80211_check_fast_xmit(sta);
 445                         }
 446                 } else {
 447                         rcu_assign_pointer(sta->gtk[idx], new);
 448                 }
 449                 /* Only needed for transition from no key -> key.
 450                  * Still triggers unnecessary when using Extended Key ID
 451                  * and installing the second key ID the first time.
 452                  */
 453                 if (new && !old)
 454                         ieee80211_check_fast_rx(sta);
 455         } else {
 456                 defunikey = old &&
 457                         old == key_mtx_dereference(sdata->local,
 458                                                 sdata->default_unicast_key);
 459                 defmultikey = old &&
 460                         old == key_mtx_dereference(sdata->local,
 461                                                 sdata->default_multicast_key);
 462                 defmgmtkey = old &&
 463                         old == key_mtx_dereference(sdata->local,
 464                                                 sdata->default_mgmt_key);
 465
 466                 if (defunikey && !new)
 467                         __ieee80211_set_default_key(sdata, -1, true, false);
 468                 if (defmultikey && !new)
 469                         __ieee80211_set_default_key(sdata, -1, false, true);
 470                 if (defmgmtkey && !new)
 471                         __ieee80211_set_default_mgmt_key(sdata, -1);
 472
 473                 rcu_assign_pointer(sdata->keys[idx], new);
 474                 if (defunikey && new)
 475                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 476                                                     true, false);
 477                 if (defmultikey && new)
 478                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 479                                                     false, true);
 480                 if (defmgmtkey && new)
 481                         __ieee80211_set_default_mgmt_key(sdata,
 482                                                          new->conf.keyidx);
 483         }
 484
 485         if (old)
 486                 list_del_rcu(&old->list);
 487
 488         return 0;
 489 }
 490
 491 struct ieee80211_key *
 492 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
 493                     const u8 *key_data,
 494                     size_t seq_len, const u8 *seq,
 495                     const struct ieee80211_cipher_scheme *cs)
 496 {
 497         struct ieee80211_key *key;
 498         int i, j, err;
 499
 500         if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS))
 501                 return ERR_PTR(-EINVAL);
 502
 503         key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
 504         if (!key)
 505                 return ERR_PTR(-ENOMEM);
 506
 507         /*
 508          * Default to software encryption; we'll later upload the
 509          * key to the hardware if possible.
 510          */
 511         key->conf.flags = 0;
 512         key->flags = 0;
 513
 514         key->conf.cipher = cipher;
 515         key->conf.keyidx = idx;
 516         key->conf.keylen = key_len;
 517         switch (cipher) {
 518         case WLAN_CIPHER_SUITE_WEP40:
 519         case WLAN_CIPHER_SUITE_WEP104:
 520                 key->conf.iv_len = IEEE80211_WEP_IV_LEN;
 521                 key->conf.icv_len = IEEE80211_WEP_ICV_LEN;
 522                 break;
 523         case WLAN_CIPHER_SUITE_TKIP:
 524                 key->conf.iv_len = IEEE80211_TKIP_IV_LEN;
 525                 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN;
 526                 if (seq) {
 527                         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
 528                                 key->u.tkip.rx[i].iv32 =
 529                                         get_unaligned_le32(&seq[2]);
 530                                 key->u.tkip.rx[i].iv16 =
 531                                         get_unaligned_le16(seq);
 532                         }
 533                 }
 534                 spin_lock_init(&key->u.tkip.txlock);
 535                 break;
 536         case WLAN_CIPHER_SUITE_CCMP:
 537                 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN;
 538                 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN;
 539                 if (seq) {
 540                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 541                                 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++)
 542                                         key->u.ccmp.rx_pn[i][j] =
 543                                                 seq[IEEE80211_CCMP_PN_LEN - j - 1];
 544                 }
 545                 /*
 546                  * Initialize AES key state here as an optimization so that
 547                  * it does not need to be initialized for every packet.
 548                  */
 549                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 550                         key_data, key_len, IEEE80211_CCMP_MIC_LEN);
 551                 if (IS_ERR(key->u.ccmp.tfm)) {
 552                         err = PTR_ERR(key->u.ccmp.tfm);
 553                         kfree(key);
 554                         return ERR_PTR(err);
 555                 }
 556                 break;
 557         case WLAN_CIPHER_SUITE_CCMP_256:
 558                 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN;
 559                 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN;
 560                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 561                         for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++)
 562                                 key->u.ccmp.rx_pn[i][j] =
 563                                         seq[IEEE80211_CCMP_256_PN_LEN - j - 1];
 564                 /* Initialize AES key state here as an optimization so that
 565                  * it does not need to be initialized for every packet.
 566                  */
 567                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 568                         key_data, key_len, IEEE80211_CCMP_256_MIC_LEN);
 569                 if (IS_ERR(key->u.ccmp.tfm)) {
 570                         err = PTR_ERR(key->u.ccmp.tfm);
 571                         kfree(key);
 572                         return ERR_PTR(err);
 573                 }
 574                 break;
 575         case WLAN_CIPHER_SUITE_AES_CMAC:
 576         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 577                 key->conf.iv_len = 0;
 578                 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
 579                         key->conf.icv_len = sizeof(struct ieee80211_mmie);
 580                 else
 581                         key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 582                 if (seq)
 583                         for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
 584                                 key->u.aes_cmac.rx_pn[j] =
 585                                         seq[IEEE80211_CMAC_PN_LEN - j - 1];
 586                 /*
 587                  * Initialize AES key state here as an optimization so that
 588                  * it does not need to be initialized for every packet.
 589                  */
 590                 key->u.aes_cmac.tfm =
 591                         ieee80211_aes_cmac_key_setup(key_data, key_len);
 592                 if (IS_ERR(key->u.aes_cmac.tfm)) {
 593                         err = PTR_ERR(key->u.aes_cmac.tfm);
 594                         kfree(key);
 595                         return ERR_PTR(err);
 596                 }
 597                 break;
 598         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 599         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 600                 key->conf.iv_len = 0;
 601                 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 602                 if (seq)
 603                         for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++)
 604                                 key->u.aes_gmac.rx_pn[j] =
 605                                         seq[IEEE80211_GMAC_PN_LEN - j - 1];
 606                 /* Initialize AES key state here as an optimization so that
 607                  * it does not need to be initialized for every packet.
 608                  */
 609                 key->u.aes_gmac.tfm =
 610                         ieee80211_aes_gmac_key_setup(key_data, key_len);
 611                 if (IS_ERR(key->u.aes_gmac.tfm)) {
 612                         err = PTR_ERR(key->u.aes_gmac.tfm);
 613                         kfree(key);
 614                         return ERR_PTR(err);
 615                 }
 616                 break;
 617         case WLAN_CIPHER_SUITE_GCMP:
 618         case WLAN_CIPHER_SUITE_GCMP_256:
 619                 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
 620                 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
 621                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 622                         for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
 623                                 key->u.gcmp.rx_pn[i][j] =
 624                                         seq[IEEE80211_GCMP_PN_LEN - j - 1];
 625                 /* Initialize AES key state here as an optimization so that
 626                  * it does not need to be initialized for every packet.
 627                  */
 628                 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
 629                                                                       key_len);
 630                 if (IS_ERR(key->u.gcmp.tfm)) {
 631                         err = PTR_ERR(key->u.gcmp.tfm);
 632                         kfree(key);
 633                         return ERR_PTR(err);
 634                 }
 635                 break;
 636         default:
 637                 if (cs) {
 638                         if (seq_len && seq_len != cs->pn_len) {
 639                                 kfree(key);
 640                                 return ERR_PTR(-EINVAL);
 641                         }
 642
 643                         key->conf.iv_len = cs->hdr_len;
 644                         key->conf.icv_len = cs->mic_len;
 645                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 646                                 for (j = 0; j < seq_len; j++)
 647                                         key->u.gen.rx_pn[i][j] =
 648                                                         seq[seq_len - j - 1];
 649                         key->flags |= KEY_FLAG_CIPHER_SCHEME;
 650                 }
 651         }
 652         memcpy(key->conf.key, key_data, key_len);
 653         INIT_LIST_HEAD(&key->list);
 654
 655         return key;
 656 }
 657
 658 static void ieee80211_key_free_common(struct ieee80211_key *key)
 659 {
 660         switch (key->conf.cipher) {
 661         case WLAN_CIPHER_SUITE_CCMP:
 662         case WLAN_CIPHER_SUITE_CCMP_256:
 663                 ieee80211_aes_key_free(key->u.ccmp.tfm);
 664                 break;
 665         case WLAN_CIPHER_SUITE_AES_CMAC:
 666         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 667                 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
 668                 break;
 669         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 670         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 671                 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm);
 672                 break;
 673         case WLAN_CIPHER_SUITE_GCMP:
 674         case WLAN_CIPHER_SUITE_GCMP_256:
 675                 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
 676                 break;
 677         }
 678         kzfree(key);
 679 }
 680
 681 static void __ieee80211_key_destroy(struct ieee80211_key *key,
 682                                     bool delay_tailroom)
 683 {
 684         if (key->local) {
 685                 struct ieee80211_sub_if_data *sdata = key->sdata;
 686
 687                 ieee80211_debugfs_key_remove(key);
 688
 689                 if (delay_tailroom) {
 690                         /* see ieee80211_delayed_tailroom_dec */
 691                         sdata->crypto_tx_tailroom_pending_dec++;
 692                         schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
 693                                               HZ/2);
 694                 } else {
 695                         decrease_tailroom_need_count(sdata, 1);
 696                 }
 697         }
 698
 699         ieee80211_key_free_common(key);
 700 }
 701
 702 static void ieee80211_key_destroy(struct ieee80211_key *key,
 703                                   bool delay_tailroom)
 704 {
 705         if (!key)
 706                 return;
 707
 708         /*
 709          * Synchronize so the TX path and rcu key iterators
 710          * can no longer be using this key before we free/remove it.
 711          */
 712         synchronize_net();
 713
 714         __ieee80211_key_destroy(key, delay_tailroom);
 715 }
 716
 717 void ieee80211_key_free_unused(struct ieee80211_key *key)
 718 {
 719         WARN_ON(key->sdata || key->local);
 720         ieee80211_key_free_common(key);
 721 }
 722
 723 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata,
 724                                     struct ieee80211_key *old,
 725                                     struct ieee80211_key *new)
 726 {
 727         u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP];
 728         u8 *tk_old, *tk_new;
 729
 730         if (!old || new->conf.keylen != old->conf.keylen)
 731                 return false;
 732
 733         tk_old = old->conf.key;
 734         tk_new = new->conf.key;
 735
 736         /*
 737          * In station mode, don't compare the TX MIC key, as it's never used
 738          * and offloaded rekeying may not care to send it to the host. This
 739          * is the case in iwlwifi, for example.
 740          */
 741         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 742             new->conf.cipher == WLAN_CIPHER_SUITE_TKIP &&
 743             new->conf.keylen == WLAN_KEY_LEN_TKIP &&
 744             !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
 745                 memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP);
 746                 memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP);
 747                 memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 748                 memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 749                 tk_old = tkip_old;
 750                 tk_new = tkip_new;
 751         }
 752
 753         return !crypto_memneq(tk_old, tk_new, new->conf.keylen);
 754 }
 755
 756 int ieee80211_key_link(struct ieee80211_key *key,
 757                        struct ieee80211_sub_if_data *sdata,
 758                        struct sta_info *sta)
 759 {
 760         struct ieee80211_key *old_key;
 761         int idx = key->conf.keyidx;
 762         bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
 763         /*
 764          * We want to delay tailroom updates only for station - in that
 765          * case it helps roaming speed, but in other cases it hurts and
 766          * can cause warnings to appear.
 767          */
 768         bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION;
 769         int ret = -EOPNOTSUPP;
 770
 771         mutex_lock(&sdata->local->key_mtx);
 772
 773         if (sta && pairwise) {
 774                 struct ieee80211_key *alt_key;
 775
 776                 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
 777                 alt_key = key_mtx_dereference(sdata->local, sta->ptk[idx ^ 1]);
 778
 779                 /* The rekey code assumes that the old and new key are using
 780                  * the same cipher. Enforce the assumption for pairwise keys.
 781                  */
 782                 if (key &&
 783                     ((alt_key && alt_key->conf.cipher != key->conf.cipher) ||
 784                      (old_key && old_key->conf.cipher != key->conf.cipher)))
 785                         goto out;
 786         } else if (sta) {
 787                 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
 788         } else {
 789                 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 790         }
 791
 792         /* Non-pairwise keys must also not switch the cipher on rekey */
 793         if (!pairwise) {
 794                 if (key && old_key && old_key->conf.cipher != key->conf.cipher)
 795                         goto out;
 796         }
 797
 798         /*
 799          * Silently accept key re-installation without really installing the
 800          * new version of the key to avoid nonce reuse or replay issues.
 801          */
 802         if (ieee80211_key_identical(sdata, old_key, key)) {
 803                 ieee80211_key_free_unused(key);
 804                 ret = 0;
 805                 goto out;
 806         }
 807
 808         key->local = sdata->local;
 809         key->sdata = sdata;
 810         key->sta = sta;
 811
 812         increment_tailroom_need_count(sdata);
 813
 814         ret = ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
 815
 816         if (!ret) {
 817                 ieee80211_debugfs_key_add(key);
 818                 ieee80211_key_destroy(old_key, delay_tailroom);
 819         } else {
 820                 ieee80211_key_free(key, delay_tailroom);
 821         }
 822
 823  out:
 824         mutex_unlock(&sdata->local->key_mtx);
 825
 826         return ret;
 827 }
 828
 829 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
 830 {
 831         if (!key)
 832                 return;
 833
 834         /*
 835          * Replace key with nothingness if it was ever used.
 836          */
 837         if (key->sdata)
 838                 ieee80211_key_replace(key->sdata, key->sta,
 839                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 840                                 key, NULL);
 841         ieee80211_key_destroy(key, delay_tailroom);
 842 }
 843
 844 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
 845 {
 846         struct ieee80211_key *key;
 847         struct ieee80211_sub_if_data *vlan;
 848
 849         ASSERT_RTNL();
 850
 851         if (WARN_ON(!ieee80211_sdata_running(sdata)))
 852                 return;
 853
 854         mutex_lock(&sdata->local->key_mtx);
 855
 856         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
 857                      sdata->crypto_tx_tailroom_pending_dec);
 858
 859         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 860                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 861                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
 862                                      vlan->crypto_tx_tailroom_pending_dec);
 863         }
 864
 865         list_for_each_entry(key, &sdata->key_list, list) {
 866                 increment_tailroom_need_count(sdata);
 867                 ieee80211_key_enable_hw_accel(key);
 868         }
 869
 870         mutex_unlock(&sdata->local->key_mtx);
 871 }
 872
 873 void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata)
 874 {
 875         struct ieee80211_sub_if_data *vlan;
 876
 877         mutex_lock(&sdata->local->key_mtx);
 878
 879         sdata->crypto_tx_tailroom_needed_cnt = 0;
 880
 881         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 882                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 883                         vlan->crypto_tx_tailroom_needed_cnt = 0;
 884         }
 885
 886         mutex_unlock(&sdata->local->key_mtx);
 887 }
 888
 889 void ieee80211_iter_keys(struct ieee80211_hw *hw,
 890                          struct ieee80211_vif *vif,
 891                          void (*iter)(struct ieee80211_hw *hw,
 892                                       struct ieee80211_vif *vif,
 893                                       struct ieee80211_sta *sta,
 894                                       struct ieee80211_key_conf *key,
 895                                       void *data),
 896                          void *iter_data)
 897 {
 898         struct ieee80211_local *local = hw_to_local(hw);
 899         struct ieee80211_key *key, *tmp;
 900         struct ieee80211_sub_if_data *sdata;
 901
 902         ASSERT_RTNL();
 903
 904         mutex_lock(&local->key_mtx);
 905         if (vif) {
 906                 sdata = vif_to_sdata(vif);
 907                 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
 908                         iter(hw, &sdata->vif,
 909                              key->sta ? &key->sta->sta : NULL,
 910                              &key->conf, iter_data);
 911         } else {
 912                 list_for_each_entry(sdata, &local->interfaces, list)
 913                         list_for_each_entry_safe(key, tmp,
 914                                                  &sdata->key_list, list)
 915                                 iter(hw, &sdata->vif,
 916                                      key->sta ? &key->sta->sta : NULL,
 917                                      &key->conf, iter_data);
 918         }
 919         mutex_unlock(&local->key_mtx);
 920 }
 921 EXPORT_SYMBOL(ieee80211_iter_keys);
 922
 923 static void
 924 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
 925                          struct ieee80211_sub_if_data *sdata,
 926                          void (*iter)(struct ieee80211_hw *hw,
 927                                       struct ieee80211_vif *vif,
 928                                       struct ieee80211_sta *sta,
 929                                       struct ieee80211_key_conf *key,
 930                                       void *data),
 931                          void *iter_data)
 932 {
 933         struct ieee80211_key *key;
 934
 935         list_for_each_entry_rcu(key, &sdata->key_list, list) {
 936                 /* skip keys of station in removal process */
 937                 if (key->sta && key->sta->removed)
 938                         continue;
 939                 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 940                         continue;
 941
 942                 iter(hw, &sdata->vif,
 943                      key->sta ? &key->sta->sta : NULL,
 944                      &key->conf, iter_data);
 945         }
 946 }
 947
 948 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
 949                              struct ieee80211_vif *vif,
 950                              void (*iter)(struct ieee80211_hw *hw,
 951                                           struct ieee80211_vif *vif,
 952                                           struct ieee80211_sta *sta,
 953                                           struct ieee80211_key_conf *key,
 954                                           void *data),
 955                              void *iter_data)
 956 {
 957         struct ieee80211_local *local = hw_to_local(hw);
 958         struct ieee80211_sub_if_data *sdata;
 959
 960         if (vif) {
 961                 sdata = vif_to_sdata(vif);
 962                 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
 963         } else {
 964                 list_for_each_entry_rcu(sdata, &local->interfaces, list)
 965                         _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
 966         }
 967 }
 968 EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
 969
 970 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
 971                                       struct list_head *keys)
 972 {
 973         struct ieee80211_key *key, *tmp;
 974
 975         decrease_tailroom_need_count(sdata,
 976                                      sdata->crypto_tx_tailroom_pending_dec);
 977         sdata->crypto_tx_tailroom_pending_dec = 0;
 978
 979         ieee80211_debugfs_key_remove_mgmt_default(sdata);
 980
 981         list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
 982                 ieee80211_key_replace(key->sdata, key->sta,
 983                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 984                                 key, NULL);
 985                 list_add_tail(&key->list, keys);
 986         }
 987
 988         ieee80211_debugfs_key_update_default(sdata);
 989 }
 990
 991 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
 992                          bool force_synchronize)
 993 {
 994         struct ieee80211_local *local = sdata->local;
 995         struct ieee80211_sub_if_data *vlan;
 996         struct ieee80211_sub_if_data *master;
 997         struct ieee80211_key *key, *tmp;
 998         LIST_HEAD(keys);
 999
1000         cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
1001
1002         mutex_lock(&local->key_mtx);
1003
1004         ieee80211_free_keys_iface(sdata, &keys);
1005
1006         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1007                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1008                         ieee80211_free_keys_iface(vlan, &keys);
1009         }
1010
1011         if (!list_empty(&keys) || force_synchronize)
1012                 synchronize_net();
1013         list_for_each_entry_safe(key, tmp, &keys, list)
1014                 __ieee80211_key_destroy(key, false);
1015
1016         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1017                 if (sdata->bss) {
1018                         master = container_of(sdata->bss,
1019                                               struct ieee80211_sub_if_data,
1020                                               u.ap);
1021
1022                         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
1023                                      master->crypto_tx_tailroom_needed_cnt);
1024                 }
1025         } else {
1026                 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
1027                              sdata->crypto_tx_tailroom_pending_dec);
1028         }
1029
1030         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1031                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1032                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
1033                                      vlan->crypto_tx_tailroom_pending_dec);
1034         }
1035
1036         mutex_unlock(&local->key_mtx);
1037 }
1038
1039 void ieee80211_free_sta_keys(struct ieee80211_local *local,
1040                              struct sta_info *sta)
1041 {
1042         struct ieee80211_key *key;
1043         int i;
1044
1045         mutex_lock(&local->key_mtx);
1046         for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) {
1047                 key = key_mtx_dereference(local, sta->gtk[i]);
1048                 if (!key)
1049                         continue;
1050                 ieee80211_key_replace(key->sdata, key->sta,
1051                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1052                                 key, NULL);
1053                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1054                                         NL80211_IFTYPE_STATION);
1055         }
1056
1057         for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1058                 key = key_mtx_dereference(local, sta->ptk[i]);
1059                 if (!key)
1060                         continue;
1061                 ieee80211_key_replace(key->sdata, key->sta,
1062                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1063                                 key, NULL);
1064                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1065                                         NL80211_IFTYPE_STATION);
1066         }
1067
1068         mutex_unlock(&local->key_mtx);
1069 }
1070
1071 void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
1072 {
1073         struct ieee80211_sub_if_data *sdata;
1074
1075         sdata = container_of(wk, struct ieee80211_sub_if_data,
1076                              dec_tailroom_needed_wk.work);
1077
1078         /*
1079          * The reason for the delayed tailroom needed decrementing is to
1080          * make roaming faster: during roaming, all keys are first deleted
1081          * and then new keys are installed. The first new key causes the
1082          * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
1083          * the cost of synchronize_net() (which can be slow). Avoid this
1084          * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
1085          * key removal for a while, so if we roam the value is larger than
1086          * zero and no 0->1 transition happens.
1087          *
1088          * The cost is that if the AP switching was from an AP with keys
1089          * to one without, we still allocate tailroom while it would no
1090          * longer be needed. However, in the typical (fast) roaming case
1091          * within an ESS this usually won't happen.
1092          */
1093
1094         mutex_lock(&sdata->local->key_mtx);
1095         decrease_tailroom_need_count(sdata,
1096                                      sdata->crypto_tx_tailroom_pending_dec);
1097         sdata->crypto_tx_tailroom_pending_dec = 0;
1098         mutex_unlock(&sdata->local->key_mtx);
1099 }
1100
1101 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
1102                                 const u8 *replay_ctr, gfp_t gfp)
1103 {
1104         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1105
1106         trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
1107
1108         cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
1109 }
1110 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
1111
1112 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
1113                               int tid, struct ieee80211_key_seq *seq)
1114 {
1115         struct ieee80211_key *key;
1116         const u8 *pn;
1117
1118         key = container_of(keyconf, struct ieee80211_key, conf);
1119
1120         switch (key->conf.cipher) {
1121         case WLAN_CIPHER_SUITE_TKIP:
1122                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1123                         return;
1124                 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
1125                 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
1126                 break;
1127         case WLAN_CIPHER_SUITE_CCMP:
1128         case WLAN_CIPHER_SUITE_CCMP_256:
1129                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1130                         return;
1131                 if (tid < 0)
1132                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1133                 else
1134                         pn = key->u.ccmp.rx_pn[tid];
1135                 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
1136                 break;
1137         case WLAN_CIPHER_SUITE_AES_CMAC:
1138         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1139                 if (WARN_ON(tid != 0))
1140                         return;
1141                 pn = key->u.aes_cmac.rx_pn;
1142                 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
1143                 break;
1144         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1145         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1146                 if (WARN_ON(tid != 0))
1147                         return;
1148                 pn = key->u.aes_gmac.rx_pn;
1149                 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
1150                 break;
1151         case WLAN_CIPHER_SUITE_GCMP:
1152         case WLAN_CIPHER_SUITE_GCMP_256:
1153                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1154                         return;
1155                 if (tid < 0)
1156                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1157                 else
1158                         pn = key->u.gcmp.rx_pn[tid];
1159                 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
1160                 break;
1161         }
1162 }
1163 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
1164
1165 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1166                               int tid, struct ieee80211_key_seq *seq)
1167 {
1168         struct ieee80211_key *key;
1169         u8 *pn;
1170
1171         key = container_of(keyconf, struct ieee80211_key, conf);
1172
1173         switch (key->conf.cipher) {
1174         case WLAN_CIPHER_SUITE_TKIP:
1175                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1176                         return;
1177                 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1178                 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1179                 break;
1180         case WLAN_CIPHER_SUITE_CCMP:
1181         case WLAN_CIPHER_SUITE_CCMP_256:
1182                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1183                         return;
1184                 if (tid < 0)
1185                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1186                 else
1187                         pn = key->u.ccmp.rx_pn[tid];
1188                 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1189                 break;
1190         case WLAN_CIPHER_SUITE_AES_CMAC:
1191         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1192                 if (WARN_ON(tid != 0))
1193                         return;
1194                 pn = key->u.aes_cmac.rx_pn;
1195                 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1196                 break;
1197         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1198         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1199                 if (WARN_ON(tid != 0))
1200                         return;
1201                 pn = key->u.aes_gmac.rx_pn;
1202                 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1203                 break;
1204         case WLAN_CIPHER_SUITE_GCMP:
1205         case WLAN_CIPHER_SUITE_GCMP_256:
1206                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1207                         return;
1208                 if (tid < 0)
1209                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1210                 else
1211                         pn = key->u.gcmp.rx_pn[tid];
1212                 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1213                 break;
1214         default:
1215                 WARN_ON(1);
1216                 break;
1217         }
1218 }
1219 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1220
1221 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1222 {
1223         struct ieee80211_key *key;
1224
1225         key = container_of(keyconf, struct ieee80211_key, conf);
1226
1227         assert_key_lock(key->local);
1228
1229         /*
1230          * if key was uploaded, we assume the driver will/has remove(d)
1231          * it, so adjust bookkeeping accordingly
1232          */
1233         if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1234                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1235
1236                 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
1237                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
1238                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1239                         increment_tailroom_need_count(key->sdata);
1240         }
1241
1242         ieee80211_key_free(key, false);
1243 }
1244 EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1245
1246 struct ieee80211_key_conf *
1247 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1248                         struct ieee80211_key_conf *keyconf)
1249 {
1250         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1251         struct ieee80211_local *local = sdata->local;
1252         struct ieee80211_key *key;
1253         int err;
1254
1255         if (WARN_ON(!local->wowlan))
1256                 return ERR_PTR(-EINVAL);
1257
1258         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1259                 return ERR_PTR(-EINVAL);
1260
1261         key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1262                                   keyconf->keylen, keyconf->key,
1263                                   0, NULL, NULL);
1264         if (IS_ERR(key))
1265                 return ERR_CAST(key);
1266
1267         if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1268                 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1269
1270         err = ieee80211_key_link(key, sdata, NULL);
1271         if (err)
1272                 return ERR_PTR(err);
1273
1274         return &key->conf;
1275 }
1276 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);