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         struct ieee80211_key *old;
 269
 270         assert_key_lock(local);
 271
 272         old = key_mtx_dereference(local, sta->ptk[sta->ptk_idx]);
 273         sta->ptk_idx = key->conf.keyidx;
 274         ieee80211_check_fast_xmit(sta);
 275
 276         return 0;
 277 }
 278
 279 static int ieee80211_hw_key_replace(struct ieee80211_key *old_key,
 280                                     struct ieee80211_key *new_key,
 281                                     bool pairwise)
 282 {
 283         struct ieee80211_sub_if_data *sdata;
 284         struct ieee80211_local *local;
 285         struct sta_info *sta;
 286         int ret;
 287
 288         /* Aggregation sessions are OK when running on SW crypto.
 289          * A broken remote STA may cause issues not observed with HW
 290          * crypto, though.
 291          */
 292         if (!(old_key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 293                 return 0;
 294
 295         assert_key_lock(old_key->local);
 296         sta = old_key->sta;
 297
 298         /* Unicast rekey without Extended Key ID needs special handling */
 299         if (new_key && sta && pairwise &&
 300             rcu_access_pointer(sta->ptk[sta->ptk_idx]) == old_key) {
 301                 local = old_key->local;
 302                 sdata = old_key->sdata;
 303
 304                 /* Stop TX till we are on the new key */
 305                 old_key->flags |= KEY_FLAG_TAINTED;
 306                 ieee80211_clear_fast_xmit(sta);
 307
 308                 /* Aggregation sessions during rekey are complicated due to the
 309                  * reorder buffer and retransmits. Side step that by blocking
 310                  * aggregation during rekey and tear down running sessions.
 311                  */
 312                 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
 313                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
 314                         ieee80211_sta_tear_down_BA_sessions(sta,
 315                                                             AGG_STOP_LOCAL_REQUEST);
 316                 }
 317
 318                 if (!wiphy_ext_feature_isset(local->hw.wiphy,
 319                                              NL80211_EXT_FEATURE_CAN_REPLACE_PTK0)) {
 320                         pr_warn_ratelimited("Rekeying PTK for STA %pM but driver can't safely do that.",
 321                                             sta->sta.addr);
 322                         /* Flushing the driver queues *may* help prevent
 323                          * the clear text leaks and freezes.
 324                          */
 325                         ieee80211_flush_queues(local, sdata, false);
 326                 }
 327         }
 328
 329         ieee80211_key_disable_hw_accel(old_key);
 330
 331         if (new_key)
 332                 ret = ieee80211_key_enable_hw_accel(new_key);
 333         else
 334                 ret = 0;
 335
 336         return ret;
 337 }
 338
 339 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
 340                                         int idx, bool uni, bool multi)
 341 {
 342         struct ieee80211_key *key = NULL;
 343
 344         assert_key_lock(sdata->local);
 345
 346         if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
 347                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 348
 349         if (uni) {
 350                 rcu_assign_pointer(sdata->default_unicast_key, key);
 351                 ieee80211_check_fast_xmit_iface(sdata);
 352                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
 353                         drv_set_default_unicast_key(sdata->local, sdata, idx);
 354         }
 355
 356         if (multi)
 357                 rcu_assign_pointer(sdata->default_multicast_key, key);
 358
 359         ieee80211_debugfs_key_update_default(sdata);
 360 }
 361
 362 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
 363                                bool uni, bool multi)
 364 {
 365         mutex_lock(&sdata->local->key_mtx);
 366         __ieee80211_set_default_key(sdata, idx, uni, multi);
 367         mutex_unlock(&sdata->local->key_mtx);
 368 }
 369
 370 static void
 371 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
 372 {
 373         struct ieee80211_key *key = NULL;
 374
 375         assert_key_lock(sdata->local);
 376
 377         if (idx >= NUM_DEFAULT_KEYS &&
 378             idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
 379                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 380
 381         rcu_assign_pointer(sdata->default_mgmt_key, key);
 382
 383         ieee80211_debugfs_key_update_default(sdata);
 384 }
 385
 386 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
 387                                     int idx)
 388 {
 389         mutex_lock(&sdata->local->key_mtx);
 390         __ieee80211_set_default_mgmt_key(sdata, idx);
 391         mutex_unlock(&sdata->local->key_mtx);
 392 }
 393
 394
 395 static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
 396                                   struct sta_info *sta,
 397                                   bool pairwise,
 398                                   struct ieee80211_key *old,
 399                                   struct ieee80211_key *new)
 400 {
 401         int idx;
 402         int ret;
 403         bool defunikey, defmultikey, defmgmtkey;
 404
 405         /* caller must provide at least one old/new */
 406         if (WARN_ON(!new && !old))
 407                 return 0;
 408
 409         if (new)
 410                 list_add_tail_rcu(&new->list, &sdata->key_list);
 411
 412         WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
 413
 414         if (old) {
 415                 idx = old->conf.keyidx;
 416                 ret = ieee80211_hw_key_replace(old, new, pairwise);
 417         } else {
 418                 /* new must be provided in case old is not */
 419                 idx = new->conf.keyidx;
 420                 if (!new->local->wowlan)
 421                         ret = ieee80211_key_enable_hw_accel(new);
 422                 else
 423                         ret = 0;
 424         }
 425
 426         if (ret)
 427                 return ret;
 428
 429         if (sta) {
 430                 if (pairwise) {
 431                         rcu_assign_pointer(sta->ptk[idx], new);
 432                         if (new &&
 433                             !(new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX)) {
 434                                 sta->ptk_idx = idx;
 435                                 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
 436                                 ieee80211_check_fast_xmit(sta);
 437                         }
 438                 } else {
 439                         rcu_assign_pointer(sta->gtk[idx], new);
 440                 }
 441                 /* Only needed for transition from no key -> key.
 442                  * Still triggers unnecessary when using Extended Key ID
 443                  * and installing the second key ID the first time.
 444                  */
 445                 if (new && !old)
 446                         ieee80211_check_fast_rx(sta);
 447         } else {
 448                 defunikey = old &&
 449                         old == key_mtx_dereference(sdata->local,
 450                                                 sdata->default_unicast_key);
 451                 defmultikey = old &&
 452                         old == key_mtx_dereference(sdata->local,
 453                                                 sdata->default_multicast_key);
 454                 defmgmtkey = old &&
 455                         old == key_mtx_dereference(sdata->local,
 456                                                 sdata->default_mgmt_key);
 457
 458                 if (defunikey && !new)
 459                         __ieee80211_set_default_key(sdata, -1, true, false);
 460                 if (defmultikey && !new)
 461                         __ieee80211_set_default_key(sdata, -1, false, true);
 462                 if (defmgmtkey && !new)
 463                         __ieee80211_set_default_mgmt_key(sdata, -1);
 464
 465                 rcu_assign_pointer(sdata->keys[idx], new);
 466                 if (defunikey && new)
 467                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 468                                                     true, false);
 469                 if (defmultikey && new)
 470                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 471                                                     false, true);
 472                 if (defmgmtkey && new)
 473                         __ieee80211_set_default_mgmt_key(sdata,
 474                                                          new->conf.keyidx);
 475         }
 476
 477         if (old)
 478                 list_del_rcu(&old->list);
 479
 480         return 0;
 481 }
 482
 483 struct ieee80211_key *
 484 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
 485                     const u8 *key_data,
 486                     size_t seq_len, const u8 *seq,
 487                     const struct ieee80211_cipher_scheme *cs)
 488 {
 489         struct ieee80211_key *key;
 490         int i, j, err;
 491
 492         if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS))
 493                 return ERR_PTR(-EINVAL);
 494
 495         key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
 496         if (!key)
 497                 return ERR_PTR(-ENOMEM);
 498
 499         /*
 500          * Default to software encryption; we'll later upload the
 501          * key to the hardware if possible.
 502          */
 503         key->conf.flags = 0;
 504         key->flags = 0;
 505
 506         key->conf.cipher = cipher;
 507         key->conf.keyidx = idx;
 508         key->conf.keylen = key_len;
 509         switch (cipher) {
 510         case WLAN_CIPHER_SUITE_WEP40:
 511         case WLAN_CIPHER_SUITE_WEP104:
 512                 key->conf.iv_len = IEEE80211_WEP_IV_LEN;
 513                 key->conf.icv_len = IEEE80211_WEP_ICV_LEN;
 514                 break;
 515         case WLAN_CIPHER_SUITE_TKIP:
 516                 key->conf.iv_len = IEEE80211_TKIP_IV_LEN;
 517                 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN;
 518                 if (seq) {
 519                         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
 520                                 key->u.tkip.rx[i].iv32 =
 521                                         get_unaligned_le32(&seq[2]);
 522                                 key->u.tkip.rx[i].iv16 =
 523                                         get_unaligned_le16(seq);
 524                         }
 525                 }
 526                 spin_lock_init(&key->u.tkip.txlock);
 527                 break;
 528         case WLAN_CIPHER_SUITE_CCMP:
 529                 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN;
 530                 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN;
 531                 if (seq) {
 532                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 533                                 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++)
 534                                         key->u.ccmp.rx_pn[i][j] =
 535                                                 seq[IEEE80211_CCMP_PN_LEN - j - 1];
 536                 }
 537                 /*
 538                  * Initialize AES key state here as an optimization so that
 539                  * it does not need to be initialized for every packet.
 540                  */
 541                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 542                         key_data, key_len, IEEE80211_CCMP_MIC_LEN);
 543                 if (IS_ERR(key->u.ccmp.tfm)) {
 544                         err = PTR_ERR(key->u.ccmp.tfm);
 545                         kfree(key);
 546                         return ERR_PTR(err);
 547                 }
 548                 break;
 549         case WLAN_CIPHER_SUITE_CCMP_256:
 550                 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN;
 551                 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN;
 552                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 553                         for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++)
 554                                 key->u.ccmp.rx_pn[i][j] =
 555                                         seq[IEEE80211_CCMP_256_PN_LEN - j - 1];
 556                 /* Initialize AES key state here as an optimization so that
 557                  * it does not need to be initialized for every packet.
 558                  */
 559                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 560                         key_data, key_len, IEEE80211_CCMP_256_MIC_LEN);
 561                 if (IS_ERR(key->u.ccmp.tfm)) {
 562                         err = PTR_ERR(key->u.ccmp.tfm);
 563                         kfree(key);
 564                         return ERR_PTR(err);
 565                 }
 566                 break;
 567         case WLAN_CIPHER_SUITE_AES_CMAC:
 568         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 569                 key->conf.iv_len = 0;
 570                 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
 571                         key->conf.icv_len = sizeof(struct ieee80211_mmie);
 572                 else
 573                         key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 574                 if (seq)
 575                         for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
 576                                 key->u.aes_cmac.rx_pn[j] =
 577                                         seq[IEEE80211_CMAC_PN_LEN - j - 1];
 578                 /*
 579                  * Initialize AES key state here as an optimization so that
 580                  * it does not need to be initialized for every packet.
 581                  */
 582                 key->u.aes_cmac.tfm =
 583                         ieee80211_aes_cmac_key_setup(key_data, key_len);
 584                 if (IS_ERR(key->u.aes_cmac.tfm)) {
 585                         err = PTR_ERR(key->u.aes_cmac.tfm);
 586                         kfree(key);
 587                         return ERR_PTR(err);
 588                 }
 589                 break;
 590         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 591         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 592                 key->conf.iv_len = 0;
 593                 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 594                 if (seq)
 595                         for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++)
 596                                 key->u.aes_gmac.rx_pn[j] =
 597                                         seq[IEEE80211_GMAC_PN_LEN - j - 1];
 598                 /* Initialize AES key state here as an optimization so that
 599                  * it does not need to be initialized for every packet.
 600                  */
 601                 key->u.aes_gmac.tfm =
 602                         ieee80211_aes_gmac_key_setup(key_data, key_len);
 603                 if (IS_ERR(key->u.aes_gmac.tfm)) {
 604                         err = PTR_ERR(key->u.aes_gmac.tfm);
 605                         kfree(key);
 606                         return ERR_PTR(err);
 607                 }
 608                 break;
 609         case WLAN_CIPHER_SUITE_GCMP:
 610         case WLAN_CIPHER_SUITE_GCMP_256:
 611                 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
 612                 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
 613                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 614                         for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
 615                                 key->u.gcmp.rx_pn[i][j] =
 616                                         seq[IEEE80211_GCMP_PN_LEN - j - 1];
 617                 /* Initialize AES key state here as an optimization so that
 618                  * it does not need to be initialized for every packet.
 619                  */
 620                 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
 621                                                                       key_len);
 622                 if (IS_ERR(key->u.gcmp.tfm)) {
 623                         err = PTR_ERR(key->u.gcmp.tfm);
 624                         kfree(key);
 625                         return ERR_PTR(err);
 626                 }
 627                 break;
 628         default:
 629                 if (cs) {
 630                         if (seq_len && seq_len != cs->pn_len) {
 631                                 kfree(key);
 632                                 return ERR_PTR(-EINVAL);
 633                         }
 634
 635                         key->conf.iv_len = cs->hdr_len;
 636                         key->conf.icv_len = cs->mic_len;
 637                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 638                                 for (j = 0; j < seq_len; j++)
 639                                         key->u.gen.rx_pn[i][j] =
 640                                                         seq[seq_len - j - 1];
 641                         key->flags |= KEY_FLAG_CIPHER_SCHEME;
 642                 }
 643         }
 644         memcpy(key->conf.key, key_data, key_len);
 645         INIT_LIST_HEAD(&key->list);
 646
 647         return key;
 648 }
 649
 650 static void ieee80211_key_free_common(struct ieee80211_key *key)
 651 {
 652         switch (key->conf.cipher) {
 653         case WLAN_CIPHER_SUITE_CCMP:
 654         case WLAN_CIPHER_SUITE_CCMP_256:
 655                 ieee80211_aes_key_free(key->u.ccmp.tfm);
 656                 break;
 657         case WLAN_CIPHER_SUITE_AES_CMAC:
 658         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 659                 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
 660                 break;
 661         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 662         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 663                 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm);
 664                 break;
 665         case WLAN_CIPHER_SUITE_GCMP:
 666         case WLAN_CIPHER_SUITE_GCMP_256:
 667                 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
 668                 break;
 669         }
 670         kzfree(key);
 671 }
 672
 673 static void __ieee80211_key_destroy(struct ieee80211_key *key,
 674                                     bool delay_tailroom)
 675 {
 676         if (key->local) {
 677                 struct ieee80211_sub_if_data *sdata = key->sdata;
 678
 679                 ieee80211_debugfs_key_remove(key);
 680
 681                 if (delay_tailroom) {
 682                         /* see ieee80211_delayed_tailroom_dec */
 683                         sdata->crypto_tx_tailroom_pending_dec++;
 684                         schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
 685                                               HZ/2);
 686                 } else {
 687                         decrease_tailroom_need_count(sdata, 1);
 688                 }
 689         }
 690
 691         ieee80211_key_free_common(key);
 692 }
 693
 694 static void ieee80211_key_destroy(struct ieee80211_key *key,
 695                                   bool delay_tailroom)
 696 {
 697         if (!key)
 698                 return;
 699
 700         /*
 701          * Synchronize so the TX path and rcu key iterators
 702          * can no longer be using this key before we free/remove it.
 703          */
 704         synchronize_net();
 705
 706         __ieee80211_key_destroy(key, delay_tailroom);
 707 }
 708
 709 void ieee80211_key_free_unused(struct ieee80211_key *key)
 710 {
 711         WARN_ON(key->sdata || key->local);
 712         ieee80211_key_free_common(key);
 713 }
 714
 715 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata,
 716                                     struct ieee80211_key *old,
 717                                     struct ieee80211_key *new)
 718 {
 719         u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP];
 720         u8 *tk_old, *tk_new;
 721
 722         if (!old || new->conf.keylen != old->conf.keylen)
 723                 return false;
 724
 725         tk_old = old->conf.key;
 726         tk_new = new->conf.key;
 727
 728         /*
 729          * In station mode, don't compare the TX MIC key, as it's never used
 730          * and offloaded rekeying may not care to send it to the host. This
 731          * is the case in iwlwifi, for example.
 732          */
 733         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 734             new->conf.cipher == WLAN_CIPHER_SUITE_TKIP &&
 735             new->conf.keylen == WLAN_KEY_LEN_TKIP &&
 736             !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
 737                 memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP);
 738                 memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP);
 739                 memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 740                 memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 741                 tk_old = tkip_old;
 742                 tk_new = tkip_new;
 743         }
 744
 745         return !crypto_memneq(tk_old, tk_new, new->conf.keylen);
 746 }
 747
 748 int ieee80211_key_link(struct ieee80211_key *key,
 749                        struct ieee80211_sub_if_data *sdata,
 750                        struct sta_info *sta)
 751 {
 752         struct ieee80211_key *old_key;
 753         int idx = key->conf.keyidx;
 754         bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
 755         /*
 756          * We want to delay tailroom updates only for station - in that
 757          * case it helps roaming speed, but in other cases it hurts and
 758          * can cause warnings to appear.
 759          */
 760         bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION;
 761         int ret = -EOPNOTSUPP;
 762
 763         mutex_lock(&sdata->local->key_mtx);
 764
 765         if (sta && pairwise) {
 766                 struct ieee80211_key *alt_key;
 767
 768                 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
 769                 alt_key = key_mtx_dereference(sdata->local, sta->ptk[idx ^ 1]);
 770
 771                 /* The rekey code assumes that the old and new key are using
 772                  * the same cipher. Enforce the assumption for pairwise keys.
 773                  */
 774                 if (key &&
 775                     ((alt_key && alt_key->conf.cipher != key->conf.cipher) ||
 776                      (old_key && old_key->conf.cipher != key->conf.cipher)))
 777                         goto out;
 778         } else if (sta) {
 779                 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
 780         } else {
 781                 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 782         }
 783
 784         /* Non-pairwise keys must also not switch the cipher on rekey */
 785         if (!pairwise) {
 786                 if (key && old_key && old_key->conf.cipher != key->conf.cipher)
 787                         goto out;
 788         }
 789
 790         /*
 791          * Silently accept key re-installation without really installing the
 792          * new version of the key to avoid nonce reuse or replay issues.
 793          */
 794         if (ieee80211_key_identical(sdata, old_key, key)) {
 795                 ieee80211_key_free_unused(key);
 796                 ret = 0;
 797                 goto out;
 798         }
 799
 800         key->local = sdata->local;
 801         key->sdata = sdata;
 802         key->sta = sta;
 803
 804         increment_tailroom_need_count(sdata);
 805
 806         ret = ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
 807
 808         if (!ret) {
 809                 ieee80211_debugfs_key_add(key);
 810                 ieee80211_key_destroy(old_key, delay_tailroom);
 811         } else {
 812                 ieee80211_key_free(key, delay_tailroom);
 813         }
 814
 815  out:
 816         mutex_unlock(&sdata->local->key_mtx);
 817
 818         return ret;
 819 }
 820
 821 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
 822 {
 823         if (!key)
 824                 return;
 825
 826         /*
 827          * Replace key with nothingness if it was ever used.
 828          */
 829         if (key->sdata)
 830                 ieee80211_key_replace(key->sdata, key->sta,
 831                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 832                                 key, NULL);
 833         ieee80211_key_destroy(key, delay_tailroom);
 834 }
 835
 836 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
 837 {
 838         struct ieee80211_key *key;
 839         struct ieee80211_sub_if_data *vlan;
 840
 841         ASSERT_RTNL();
 842
 843         if (WARN_ON(!ieee80211_sdata_running(sdata)))
 844                 return;
 845
 846         mutex_lock(&sdata->local->key_mtx);
 847
 848         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
 849                      sdata->crypto_tx_tailroom_pending_dec);
 850
 851         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 852                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 853                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
 854                                      vlan->crypto_tx_tailroom_pending_dec);
 855         }
 856
 857         list_for_each_entry(key, &sdata->key_list, list) {
 858                 increment_tailroom_need_count(sdata);
 859                 ieee80211_key_enable_hw_accel(key);
 860         }
 861
 862         mutex_unlock(&sdata->local->key_mtx);
 863 }
 864
 865 void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata)
 866 {
 867         struct ieee80211_sub_if_data *vlan;
 868
 869         mutex_lock(&sdata->local->key_mtx);
 870
 871         sdata->crypto_tx_tailroom_needed_cnt = 0;
 872
 873         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 874                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 875                         vlan->crypto_tx_tailroom_needed_cnt = 0;
 876         }
 877
 878         mutex_unlock(&sdata->local->key_mtx);
 879 }
 880
 881 void ieee80211_iter_keys(struct ieee80211_hw *hw,
 882                          struct ieee80211_vif *vif,
 883                          void (*iter)(struct ieee80211_hw *hw,
 884                                       struct ieee80211_vif *vif,
 885                                       struct ieee80211_sta *sta,
 886                                       struct ieee80211_key_conf *key,
 887                                       void *data),
 888                          void *iter_data)
 889 {
 890         struct ieee80211_local *local = hw_to_local(hw);
 891         struct ieee80211_key *key, *tmp;
 892         struct ieee80211_sub_if_data *sdata;
 893
 894         ASSERT_RTNL();
 895
 896         mutex_lock(&local->key_mtx);
 897         if (vif) {
 898                 sdata = vif_to_sdata(vif);
 899                 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
 900                         iter(hw, &sdata->vif,
 901                              key->sta ? &key->sta->sta : NULL,
 902                              &key->conf, iter_data);
 903         } else {
 904                 list_for_each_entry(sdata, &local->interfaces, list)
 905                         list_for_each_entry_safe(key, tmp,
 906                                                  &sdata->key_list, list)
 907                                 iter(hw, &sdata->vif,
 908                                      key->sta ? &key->sta->sta : NULL,
 909                                      &key->conf, iter_data);
 910         }
 911         mutex_unlock(&local->key_mtx);
 912 }
 913 EXPORT_SYMBOL(ieee80211_iter_keys);
 914
 915 static void
 916 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
 917                          struct ieee80211_sub_if_data *sdata,
 918                          void (*iter)(struct ieee80211_hw *hw,
 919                                       struct ieee80211_vif *vif,
 920                                       struct ieee80211_sta *sta,
 921                                       struct ieee80211_key_conf *key,
 922                                       void *data),
 923                          void *iter_data)
 924 {
 925         struct ieee80211_key *key;
 926
 927         list_for_each_entry_rcu(key, &sdata->key_list, list) {
 928                 /* skip keys of station in removal process */
 929                 if (key->sta && key->sta->removed)
 930                         continue;
 931                 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 932                         continue;
 933
 934                 iter(hw, &sdata->vif,
 935                      key->sta ? &key->sta->sta : NULL,
 936                      &key->conf, iter_data);
 937         }
 938 }
 939
 940 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
 941                              struct ieee80211_vif *vif,
 942                              void (*iter)(struct ieee80211_hw *hw,
 943                                           struct ieee80211_vif *vif,
 944                                           struct ieee80211_sta *sta,
 945                                           struct ieee80211_key_conf *key,
 946                                           void *data),
 947                              void *iter_data)
 948 {
 949         struct ieee80211_local *local = hw_to_local(hw);
 950         struct ieee80211_sub_if_data *sdata;
 951
 952         if (vif) {
 953                 sdata = vif_to_sdata(vif);
 954                 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
 955         } else {
 956                 list_for_each_entry_rcu(sdata, &local->interfaces, list)
 957                         _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
 958         }
 959 }
 960 EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
 961
 962 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
 963                                       struct list_head *keys)
 964 {
 965         struct ieee80211_key *key, *tmp;
 966
 967         decrease_tailroom_need_count(sdata,
 968                                      sdata->crypto_tx_tailroom_pending_dec);
 969         sdata->crypto_tx_tailroom_pending_dec = 0;
 970
 971         ieee80211_debugfs_key_remove_mgmt_default(sdata);
 972
 973         list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
 974                 ieee80211_key_replace(key->sdata, key->sta,
 975                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 976                                 key, NULL);
 977                 list_add_tail(&key->list, keys);
 978         }
 979
 980         ieee80211_debugfs_key_update_default(sdata);
 981 }
 982
 983 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
 984                          bool force_synchronize)
 985 {
 986         struct ieee80211_local *local = sdata->local;
 987         struct ieee80211_sub_if_data *vlan;
 988         struct ieee80211_sub_if_data *master;
 989         struct ieee80211_key *key, *tmp;
 990         LIST_HEAD(keys);
 991
 992         cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
 993
 994         mutex_lock(&local->key_mtx);
 995
 996         ieee80211_free_keys_iface(sdata, &keys);
 997
 998         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 999                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1000                         ieee80211_free_keys_iface(vlan, &keys);
1001         }
1002
1003         if (!list_empty(&keys) || force_synchronize)
1004                 synchronize_net();
1005         list_for_each_entry_safe(key, tmp, &keys, list)
1006                 __ieee80211_key_destroy(key, false);
1007
1008         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1009                 if (sdata->bss) {
1010                         master = container_of(sdata->bss,
1011                                               struct ieee80211_sub_if_data,
1012                                               u.ap);
1013
1014                         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
1015                                      master->crypto_tx_tailroom_needed_cnt);
1016                 }
1017         } else {
1018                 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
1019                              sdata->crypto_tx_tailroom_pending_dec);
1020         }
1021
1022         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1023                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1024                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
1025                                      vlan->crypto_tx_tailroom_pending_dec);
1026         }
1027
1028         mutex_unlock(&local->key_mtx);
1029 }
1030
1031 void ieee80211_free_sta_keys(struct ieee80211_local *local,
1032                              struct sta_info *sta)
1033 {
1034         struct ieee80211_key *key;
1035         int i;
1036
1037         mutex_lock(&local->key_mtx);
1038         for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) {
1039                 key = key_mtx_dereference(local, sta->gtk[i]);
1040                 if (!key)
1041                         continue;
1042                 ieee80211_key_replace(key->sdata, key->sta,
1043                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1044                                 key, NULL);
1045                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1046                                         NL80211_IFTYPE_STATION);
1047         }
1048
1049         for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1050                 key = key_mtx_dereference(local, sta->ptk[i]);
1051                 if (!key)
1052                         continue;
1053                 ieee80211_key_replace(key->sdata, key->sta,
1054                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1055                                 key, NULL);
1056                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1057                                         NL80211_IFTYPE_STATION);
1058         }
1059
1060         mutex_unlock(&local->key_mtx);
1061 }
1062
1063 void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
1064 {
1065         struct ieee80211_sub_if_data *sdata;
1066
1067         sdata = container_of(wk, struct ieee80211_sub_if_data,
1068                              dec_tailroom_needed_wk.work);
1069
1070         /*
1071          * The reason for the delayed tailroom needed decrementing is to
1072          * make roaming faster: during roaming, all keys are first deleted
1073          * and then new keys are installed. The first new key causes the
1074          * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
1075          * the cost of synchronize_net() (which can be slow). Avoid this
1076          * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
1077          * key removal for a while, so if we roam the value is larger than
1078          * zero and no 0->1 transition happens.
1079          *
1080          * The cost is that if the AP switching was from an AP with keys
1081          * to one without, we still allocate tailroom while it would no
1082          * longer be needed. However, in the typical (fast) roaming case
1083          * within an ESS this usually won't happen.
1084          */
1085
1086         mutex_lock(&sdata->local->key_mtx);
1087         decrease_tailroom_need_count(sdata,
1088                                      sdata->crypto_tx_tailroom_pending_dec);
1089         sdata->crypto_tx_tailroom_pending_dec = 0;
1090         mutex_unlock(&sdata->local->key_mtx);
1091 }
1092
1093 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
1094                                 const u8 *replay_ctr, gfp_t gfp)
1095 {
1096         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1097
1098         trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
1099
1100         cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
1101 }
1102 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
1103
1104 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
1105                               int tid, struct ieee80211_key_seq *seq)
1106 {
1107         struct ieee80211_key *key;
1108         const u8 *pn;
1109
1110         key = container_of(keyconf, struct ieee80211_key, conf);
1111
1112         switch (key->conf.cipher) {
1113         case WLAN_CIPHER_SUITE_TKIP:
1114                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1115                         return;
1116                 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
1117                 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
1118                 break;
1119         case WLAN_CIPHER_SUITE_CCMP:
1120         case WLAN_CIPHER_SUITE_CCMP_256:
1121                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1122                         return;
1123                 if (tid < 0)
1124                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1125                 else
1126                         pn = key->u.ccmp.rx_pn[tid];
1127                 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
1128                 break;
1129         case WLAN_CIPHER_SUITE_AES_CMAC:
1130         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1131                 if (WARN_ON(tid != 0))
1132                         return;
1133                 pn = key->u.aes_cmac.rx_pn;
1134                 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
1135                 break;
1136         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1137         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1138                 if (WARN_ON(tid != 0))
1139                         return;
1140                 pn = key->u.aes_gmac.rx_pn;
1141                 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
1142                 break;
1143         case WLAN_CIPHER_SUITE_GCMP:
1144         case WLAN_CIPHER_SUITE_GCMP_256:
1145                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1146                         return;
1147                 if (tid < 0)
1148                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1149                 else
1150                         pn = key->u.gcmp.rx_pn[tid];
1151                 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
1152                 break;
1153         }
1154 }
1155 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
1156
1157 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1158                               int tid, struct ieee80211_key_seq *seq)
1159 {
1160         struct ieee80211_key *key;
1161         u8 *pn;
1162
1163         key = container_of(keyconf, struct ieee80211_key, conf);
1164
1165         switch (key->conf.cipher) {
1166         case WLAN_CIPHER_SUITE_TKIP:
1167                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1168                         return;
1169                 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1170                 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1171                 break;
1172         case WLAN_CIPHER_SUITE_CCMP:
1173         case WLAN_CIPHER_SUITE_CCMP_256:
1174                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1175                         return;
1176                 if (tid < 0)
1177                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1178                 else
1179                         pn = key->u.ccmp.rx_pn[tid];
1180                 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1181                 break;
1182         case WLAN_CIPHER_SUITE_AES_CMAC:
1183         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1184                 if (WARN_ON(tid != 0))
1185                         return;
1186                 pn = key->u.aes_cmac.rx_pn;
1187                 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1188                 break;
1189         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1190         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1191                 if (WARN_ON(tid != 0))
1192                         return;
1193                 pn = key->u.aes_gmac.rx_pn;
1194                 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1195                 break;
1196         case WLAN_CIPHER_SUITE_GCMP:
1197         case WLAN_CIPHER_SUITE_GCMP_256:
1198                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1199                         return;
1200                 if (tid < 0)
1201                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1202                 else
1203                         pn = key->u.gcmp.rx_pn[tid];
1204                 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1205                 break;
1206         default:
1207                 WARN_ON(1);
1208                 break;
1209         }
1210 }
1211 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1212
1213 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1214 {
1215         struct ieee80211_key *key;
1216
1217         key = container_of(keyconf, struct ieee80211_key, conf);
1218
1219         assert_key_lock(key->local);
1220
1221         /*
1222          * if key was uploaded, we assume the driver will/has remove(d)
1223          * it, so adjust bookkeeping accordingly
1224          */
1225         if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1226                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1227
1228                 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
1229                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
1230                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1231                         increment_tailroom_need_count(key->sdata);
1232         }
1233
1234         ieee80211_key_free(key, false);
1235 }
1236 EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1237
1238 struct ieee80211_key_conf *
1239 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1240                         struct ieee80211_key_conf *keyconf)
1241 {
1242         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1243         struct ieee80211_local *local = sdata->local;
1244         struct ieee80211_key *key;
1245         int err;
1246
1247         if (WARN_ON(!local->wowlan))
1248                 return ERR_PTR(-EINVAL);
1249
1250         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1251                 return ERR_PTR(-EINVAL);
1252
1253         key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1254                                   keyconf->keylen, keyconf->key,
1255                                   0, NULL, NULL);
1256         if (IS_ERR(key))
1257                 return ERR_CAST(key);
1258
1259         if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1260                 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1261
1262         err = ieee80211_key_link(key, sdata, NULL);
1263         if (err)
1264                 return ERR_PTR(err);
1265
1266         return &key->conf;
1267 }
1268 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);