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         if (ieee80211_hw_check(&local->hw, NO_AMPDU_KEYBORDER_SUPPORT))
 274                 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
 275         ieee80211_check_fast_xmit(sta);
 276
 277         return 0;
 278 }
 279
 280 static void ieee80211_pairwise_rekey(struct ieee80211_key *old,
 281                                      struct ieee80211_key *new)
 282 {
 283         struct ieee80211_local *local = new->local;
 284         struct sta_info *sta = new->sta;
 285         int i;
 286
 287         assert_key_lock(local);
 288
 289         if (new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX) {
 290                 /* Extended Key ID key install, initial one or rekey */
 291
 292                 if (sta->ptk_idx != INVALID_PTK_KEYIDX &&
 293                     ieee80211_hw_check(&local->hw,
 294                                        NO_AMPDU_KEYBORDER_SUPPORT)) {
 295                         /* Aggregation Sessions with Extended Key ID must not
 296                          * mix MPDUs with different keyIDs within one A-MPDU.
 297                          * Tear down any running Tx aggregation and all new
 298                          * Rx/Tx aggregation request during rekey if the driver
 299                          * asks us to do so. (Blocking Tx only would be
 300                          * sufficient but WLAN_STA_BLOCK_BA gets the job done
 301                          * for the few ms we need it.)
 302                          */
 303                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
 304                         mutex_lock(&sta->ampdu_mlme.mtx);
 305                         for (i = 0; i <  IEEE80211_NUM_TIDS; i++)
 306                                 ___ieee80211_stop_tx_ba_session(sta, i,
 307                                                                 AGG_STOP_LOCAL_REQUEST);
 308                         mutex_unlock(&sta->ampdu_mlme.mtx);
 309                 }
 310         } else if (old) {
 311                 /* Rekey without Extended Key ID.
 312                  * Aggregation sessions are OK when running on SW crypto.
 313                  * A broken remote STA may cause issues not observed with HW
 314                  * crypto, though.
 315                  */
 316                 if (!(old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 317                         return;
 318
 319                 /* Stop Tx till we are on the new key */
 320                 old->flags |= KEY_FLAG_TAINTED;
 321                 ieee80211_clear_fast_xmit(sta);
 322                 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
 323                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
 324                         ieee80211_sta_tear_down_BA_sessions(sta,
 325                                                             AGG_STOP_LOCAL_REQUEST);
 326                 }
 327                 if (!wiphy_ext_feature_isset(local->hw.wiphy,
 328                                              NL80211_EXT_FEATURE_CAN_REPLACE_PTK0)) {
 329                         pr_warn_ratelimited("Rekeying PTK for STA %pM but driver can't safely do that.",
 330                                             sta->sta.addr);
 331                         /* Flushing the driver queues *may* help prevent
 332                          * the clear text leaks and freezes.
 333                          */
 334                         ieee80211_flush_queues(local, old->sdata, false);
 335                 }
 336         }
 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 static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
 395                                   struct sta_info *sta,
 396                                   bool pairwise,
 397                                   struct ieee80211_key *old,
 398                                   struct ieee80211_key *new)
 399 {
 400         int idx;
 401         int ret = 0;
 402         bool defunikey, defmultikey, defmgmtkey;
 403
 404         /* caller must provide at least one old/new */
 405         if (WARN_ON(!new && !old))
 406                 return 0;
 407
 408         if (new)
 409                 list_add_tail_rcu(&new->list, &sdata->key_list);
 410
 411         WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
 412
 413         if (new && sta && pairwise) {
 414                 /* Unicast rekey needs special handling. With Extended Key ID
 415                  * old is still NULL for the first rekey.
 416                  */
 417                 ieee80211_pairwise_rekey(old, new);
 418         }
 419
 420         if (old) {
 421                 idx = old->conf.keyidx;
 422
 423                 if (old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
 424                         ieee80211_key_disable_hw_accel(old);
 425
 426                         if (new)
 427                                 ret = ieee80211_key_enable_hw_accel(new);
 428                 }
 429         } else {
 430                 /* new must be provided in case old is not */
 431                 idx = new->conf.keyidx;
 432                 if (!new->local->wowlan)
 433                         ret = ieee80211_key_enable_hw_accel(new);
 434         }
 435
 436         if (ret)
 437                 return ret;
 438
 439         if (sta) {
 440                 if (pairwise) {
 441                         rcu_assign_pointer(sta->ptk[idx], new);
 442                         if (new &&
 443                             !(new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX)) {
 444                                 sta->ptk_idx = idx;
 445                                 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
 446                                 ieee80211_check_fast_xmit(sta);
 447                         }
 448                 } else {
 449                         rcu_assign_pointer(sta->gtk[idx], new);
 450                 }
 451                 /* Only needed for transition from no key -> key.
 452                  * Still triggers unnecessary when using Extended Key ID
 453                  * and installing the second key ID the first time.
 454                  */
 455                 if (new && !old)
 456                         ieee80211_check_fast_rx(sta);
 457         } else {
 458                 defunikey = old &&
 459                         old == key_mtx_dereference(sdata->local,
 460                                                 sdata->default_unicast_key);
 461                 defmultikey = old &&
 462                         old == key_mtx_dereference(sdata->local,
 463                                                 sdata->default_multicast_key);
 464                 defmgmtkey = old &&
 465                         old == key_mtx_dereference(sdata->local,
 466                                                 sdata->default_mgmt_key);
 467
 468                 if (defunikey && !new)
 469                         __ieee80211_set_default_key(sdata, -1, true, false);
 470                 if (defmultikey && !new)
 471                         __ieee80211_set_default_key(sdata, -1, false, true);
 472                 if (defmgmtkey && !new)
 473                         __ieee80211_set_default_mgmt_key(sdata, -1);
 474
 475                 rcu_assign_pointer(sdata->keys[idx], new);
 476                 if (defunikey && new)
 477                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 478                                                     true, false);
 479                 if (defmultikey && new)
 480                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 481                                                     false, true);
 482                 if (defmgmtkey && new)
 483                         __ieee80211_set_default_mgmt_key(sdata,
 484                                                          new->conf.keyidx);
 485         }
 486
 487         if (old)
 488                 list_del_rcu(&old->list);
 489
 490         return 0;
 491 }
 492
 493 struct ieee80211_key *
 494 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
 495                     const u8 *key_data,
 496                     size_t seq_len, const u8 *seq,
 497                     const struct ieee80211_cipher_scheme *cs)
 498 {
 499         struct ieee80211_key *key;
 500         int i, j, err;
 501
 502         if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS))
 503                 return ERR_PTR(-EINVAL);
 504
 505         key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
 506         if (!key)
 507                 return ERR_PTR(-ENOMEM);
 508
 509         /*
 510          * Default to software encryption; we'll later upload the
 511          * key to the hardware if possible.
 512          */
 513         key->conf.flags = 0;
 514         key->flags = 0;
 515
 516         key->conf.cipher = cipher;
 517         key->conf.keyidx = idx;
 518         key->conf.keylen = key_len;
 519         switch (cipher) {
 520         case WLAN_CIPHER_SUITE_WEP40:
 521         case WLAN_CIPHER_SUITE_WEP104:
 522                 key->conf.iv_len = IEEE80211_WEP_IV_LEN;
 523                 key->conf.icv_len = IEEE80211_WEP_ICV_LEN;
 524                 break;
 525         case WLAN_CIPHER_SUITE_TKIP:
 526                 key->conf.iv_len = IEEE80211_TKIP_IV_LEN;
 527                 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN;
 528                 if (seq) {
 529                         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
 530                                 key->u.tkip.rx[i].iv32 =
 531                                         get_unaligned_le32(&seq[2]);
 532                                 key->u.tkip.rx[i].iv16 =
 533                                         get_unaligned_le16(seq);
 534                         }
 535                 }
 536                 spin_lock_init(&key->u.tkip.txlock);
 537                 break;
 538         case WLAN_CIPHER_SUITE_CCMP:
 539                 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN;
 540                 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN;
 541                 if (seq) {
 542                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 543                                 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++)
 544                                         key->u.ccmp.rx_pn[i][j] =
 545                                                 seq[IEEE80211_CCMP_PN_LEN - j - 1];
 546                 }
 547                 /*
 548                  * Initialize AES key state here as an optimization so that
 549                  * it does not need to be initialized for every packet.
 550                  */
 551                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 552                         key_data, key_len, IEEE80211_CCMP_MIC_LEN);
 553                 if (IS_ERR(key->u.ccmp.tfm)) {
 554                         err = PTR_ERR(key->u.ccmp.tfm);
 555                         kfree(key);
 556                         return ERR_PTR(err);
 557                 }
 558                 break;
 559         case WLAN_CIPHER_SUITE_CCMP_256:
 560                 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN;
 561                 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN;
 562                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 563                         for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++)
 564                                 key->u.ccmp.rx_pn[i][j] =
 565                                         seq[IEEE80211_CCMP_256_PN_LEN - j - 1];
 566                 /* Initialize AES key state here as an optimization so that
 567                  * it does not need to be initialized for every packet.
 568                  */
 569                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 570                         key_data, key_len, IEEE80211_CCMP_256_MIC_LEN);
 571                 if (IS_ERR(key->u.ccmp.tfm)) {
 572                         err = PTR_ERR(key->u.ccmp.tfm);
 573                         kfree(key);
 574                         return ERR_PTR(err);
 575                 }
 576                 break;
 577         case WLAN_CIPHER_SUITE_AES_CMAC:
 578         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 579                 key->conf.iv_len = 0;
 580                 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
 581                         key->conf.icv_len = sizeof(struct ieee80211_mmie);
 582                 else
 583                         key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 584                 if (seq)
 585                         for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
 586                                 key->u.aes_cmac.rx_pn[j] =
 587                                         seq[IEEE80211_CMAC_PN_LEN - j - 1];
 588                 /*
 589                  * Initialize AES key state here as an optimization so that
 590                  * it does not need to be initialized for every packet.
 591                  */
 592                 key->u.aes_cmac.tfm =
 593                         ieee80211_aes_cmac_key_setup(key_data, key_len);
 594                 if (IS_ERR(key->u.aes_cmac.tfm)) {
 595                         err = PTR_ERR(key->u.aes_cmac.tfm);
 596                         kfree(key);
 597                         return ERR_PTR(err);
 598                 }
 599                 break;
 600         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 601         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 602                 key->conf.iv_len = 0;
 603                 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 604                 if (seq)
 605                         for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++)
 606                                 key->u.aes_gmac.rx_pn[j] =
 607                                         seq[IEEE80211_GMAC_PN_LEN - j - 1];
 608                 /* Initialize AES key state here as an optimization so that
 609                  * it does not need to be initialized for every packet.
 610                  */
 611                 key->u.aes_gmac.tfm =
 612                         ieee80211_aes_gmac_key_setup(key_data, key_len);
 613                 if (IS_ERR(key->u.aes_gmac.tfm)) {
 614                         err = PTR_ERR(key->u.aes_gmac.tfm);
 615                         kfree(key);
 616                         return ERR_PTR(err);
 617                 }
 618                 break;
 619         case WLAN_CIPHER_SUITE_GCMP:
 620         case WLAN_CIPHER_SUITE_GCMP_256:
 621                 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
 622                 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
 623                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 624                         for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
 625                                 key->u.gcmp.rx_pn[i][j] =
 626                                         seq[IEEE80211_GCMP_PN_LEN - j - 1];
 627                 /* Initialize AES key state here as an optimization so that
 628                  * it does not need to be initialized for every packet.
 629                  */
 630                 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
 631                                                                       key_len);
 632                 if (IS_ERR(key->u.gcmp.tfm)) {
 633                         err = PTR_ERR(key->u.gcmp.tfm);
 634                         kfree(key);
 635                         return ERR_PTR(err);
 636                 }
 637                 break;
 638         default:
 639                 if (cs) {
 640                         if (seq_len && seq_len != cs->pn_len) {
 641                                 kfree(key);
 642                                 return ERR_PTR(-EINVAL);
 643                         }
 644
 645                         key->conf.iv_len = cs->hdr_len;
 646                         key->conf.icv_len = cs->mic_len;
 647                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 648                                 for (j = 0; j < seq_len; j++)
 649                                         key->u.gen.rx_pn[i][j] =
 650                                                         seq[seq_len - j - 1];
 651                         key->flags |= KEY_FLAG_CIPHER_SCHEME;
 652                 }
 653         }
 654         memcpy(key->conf.key, key_data, key_len);
 655         INIT_LIST_HEAD(&key->list);
 656
 657         return key;
 658 }
 659
 660 static void ieee80211_key_free_common(struct ieee80211_key *key)
 661 {
 662         switch (key->conf.cipher) {
 663         case WLAN_CIPHER_SUITE_CCMP:
 664         case WLAN_CIPHER_SUITE_CCMP_256:
 665                 ieee80211_aes_key_free(key->u.ccmp.tfm);
 666                 break;
 667         case WLAN_CIPHER_SUITE_AES_CMAC:
 668         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 669                 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
 670                 break;
 671         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 672         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 673                 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm);
 674                 break;
 675         case WLAN_CIPHER_SUITE_GCMP:
 676         case WLAN_CIPHER_SUITE_GCMP_256:
 677                 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
 678                 break;
 679         }
 680         kzfree(key);
 681 }
 682
 683 static void __ieee80211_key_destroy(struct ieee80211_key *key,
 684                                     bool delay_tailroom)
 685 {
 686         if (key->local) {
 687                 struct ieee80211_sub_if_data *sdata = key->sdata;
 688
 689                 ieee80211_debugfs_key_remove(key);
 690
 691                 if (delay_tailroom) {
 692                         /* see ieee80211_delayed_tailroom_dec */
 693                         sdata->crypto_tx_tailroom_pending_dec++;
 694                         schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
 695                                               HZ/2);
 696                 } else {
 697                         decrease_tailroom_need_count(sdata, 1);
 698                 }
 699         }
 700
 701         ieee80211_key_free_common(key);
 702 }
 703
 704 static void ieee80211_key_destroy(struct ieee80211_key *key,
 705                                   bool delay_tailroom)
 706 {
 707         if (!key)
 708                 return;
 709
 710         /*
 711          * Synchronize so the TX path and rcu key iterators
 712          * can no longer be using this key before we free/remove it.
 713          */
 714         synchronize_net();
 715
 716         __ieee80211_key_destroy(key, delay_tailroom);
 717 }
 718
 719 void ieee80211_key_free_unused(struct ieee80211_key *key)
 720 {
 721         WARN_ON(key->sdata || key->local);
 722         ieee80211_key_free_common(key);
 723 }
 724
 725 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata,
 726                                     struct ieee80211_key *old,
 727                                     struct ieee80211_key *new)
 728 {
 729         u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP];
 730         u8 *tk_old, *tk_new;
 731
 732         if (!old || new->conf.keylen != old->conf.keylen)
 733                 return false;
 734
 735         tk_old = old->conf.key;
 736         tk_new = new->conf.key;
 737
 738         /*
 739          * In station mode, don't compare the TX MIC key, as it's never used
 740          * and offloaded rekeying may not care to send it to the host. This
 741          * is the case in iwlwifi, for example.
 742          */
 743         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 744             new->conf.cipher == WLAN_CIPHER_SUITE_TKIP &&
 745             new->conf.keylen == WLAN_KEY_LEN_TKIP &&
 746             !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
 747                 memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP);
 748                 memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP);
 749                 memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 750                 memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 751                 tk_old = tkip_old;
 752                 tk_new = tkip_new;
 753         }
 754
 755         return !crypto_memneq(tk_old, tk_new, new->conf.keylen);
 756 }
 757
 758 int ieee80211_key_link(struct ieee80211_key *key,
 759                        struct ieee80211_sub_if_data *sdata,
 760                        struct sta_info *sta)
 761 {
 762         struct ieee80211_key *old_key;
 763         int idx = key->conf.keyidx;
 764         bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
 765         /*
 766          * We want to delay tailroom updates only for station - in that
 767          * case it helps roaming speed, but in other cases it hurts and
 768          * can cause warnings to appear.
 769          */
 770         bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION;
 771         int ret = -EOPNOTSUPP;
 772
 773         mutex_lock(&sdata->local->key_mtx);
 774
 775         if (sta && pairwise) {
 776                 struct ieee80211_key *alt_key;
 777
 778                 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
 779                 alt_key = key_mtx_dereference(sdata->local, sta->ptk[idx ^ 1]);
 780
 781                 /* The rekey code assumes that the old and new key are using
 782                  * the same cipher. Enforce the assumption for pairwise keys.
 783                  */
 784                 if (key &&
 785                     ((alt_key && alt_key->conf.cipher != key->conf.cipher) ||
 786                      (old_key && old_key->conf.cipher != key->conf.cipher)))
 787                         goto out;
 788         } else if (sta) {
 789                 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
 790         } else {
 791                 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 792         }
 793
 794         /* Non-pairwise keys must also not switch the cipher on rekey */
 795         if (!pairwise) {
 796                 if (key && old_key && old_key->conf.cipher != key->conf.cipher)
 797                         goto out;
 798         }
 799
 800         /*
 801          * Silently accept key re-installation without really installing the
 802          * new version of the key to avoid nonce reuse or replay issues.
 803          */
 804         if (ieee80211_key_identical(sdata, old_key, key)) {
 805                 ieee80211_key_free_unused(key);
 806                 ret = 0;
 807                 goto out;
 808         }
 809
 810         key->local = sdata->local;
 811         key->sdata = sdata;
 812         key->sta = sta;
 813
 814         increment_tailroom_need_count(sdata);
 815
 816         ret = ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
 817
 818         if (!ret) {
 819                 ieee80211_debugfs_key_add(key);
 820                 ieee80211_key_destroy(old_key, delay_tailroom);
 821         } else {
 822                 ieee80211_key_free(key, delay_tailroom);
 823         }
 824
 825  out:
 826         mutex_unlock(&sdata->local->key_mtx);
 827
 828         return ret;
 829 }
 830
 831 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
 832 {
 833         if (!key)
 834                 return;
 835
 836         /*
 837          * Replace key with nothingness if it was ever used.
 838          */
 839         if (key->sdata)
 840                 ieee80211_key_replace(key->sdata, key->sta,
 841                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 842                                 key, NULL);
 843         ieee80211_key_destroy(key, delay_tailroom);
 844 }
 845
 846 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
 847 {
 848         struct ieee80211_key *key;
 849         struct ieee80211_sub_if_data *vlan;
 850
 851         ASSERT_RTNL();
 852
 853         if (WARN_ON(!ieee80211_sdata_running(sdata)))
 854                 return;
 855
 856         mutex_lock(&sdata->local->key_mtx);
 857
 858         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
 859                      sdata->crypto_tx_tailroom_pending_dec);
 860
 861         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 862                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 863                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
 864                                      vlan->crypto_tx_tailroom_pending_dec);
 865         }
 866
 867         list_for_each_entry(key, &sdata->key_list, list) {
 868                 increment_tailroom_need_count(sdata);
 869                 ieee80211_key_enable_hw_accel(key);
 870         }
 871
 872         mutex_unlock(&sdata->local->key_mtx);
 873 }
 874
 875 void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata)
 876 {
 877         struct ieee80211_sub_if_data *vlan;
 878
 879         mutex_lock(&sdata->local->key_mtx);
 880
 881         sdata->crypto_tx_tailroom_needed_cnt = 0;
 882
 883         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 884                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 885                         vlan->crypto_tx_tailroom_needed_cnt = 0;
 886         }
 887
 888         mutex_unlock(&sdata->local->key_mtx);
 889 }
 890
 891 void ieee80211_iter_keys(struct ieee80211_hw *hw,
 892                          struct ieee80211_vif *vif,
 893                          void (*iter)(struct ieee80211_hw *hw,
 894                                       struct ieee80211_vif *vif,
 895                                       struct ieee80211_sta *sta,
 896                                       struct ieee80211_key_conf *key,
 897                                       void *data),
 898                          void *iter_data)
 899 {
 900         struct ieee80211_local *local = hw_to_local(hw);
 901         struct ieee80211_key *key, *tmp;
 902         struct ieee80211_sub_if_data *sdata;
 903
 904         ASSERT_RTNL();
 905
 906         mutex_lock(&local->key_mtx);
 907         if (vif) {
 908                 sdata = vif_to_sdata(vif);
 909                 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
 910                         iter(hw, &sdata->vif,
 911                              key->sta ? &key->sta->sta : NULL,
 912                              &key->conf, iter_data);
 913         } else {
 914                 list_for_each_entry(sdata, &local->interfaces, list)
 915                         list_for_each_entry_safe(key, tmp,
 916                                                  &sdata->key_list, list)
 917                                 iter(hw, &sdata->vif,
 918                                      key->sta ? &key->sta->sta : NULL,
 919                                      &key->conf, iter_data);
 920         }
 921         mutex_unlock(&local->key_mtx);
 922 }
 923 EXPORT_SYMBOL(ieee80211_iter_keys);
 924
 925 static void
 926 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
 927                          struct ieee80211_sub_if_data *sdata,
 928                          void (*iter)(struct ieee80211_hw *hw,
 929                                       struct ieee80211_vif *vif,
 930                                       struct ieee80211_sta *sta,
 931                                       struct ieee80211_key_conf *key,
 932                                       void *data),
 933                          void *iter_data)
 934 {
 935         struct ieee80211_key *key;
 936
 937         list_for_each_entry_rcu(key, &sdata->key_list, list) {
 938                 /* skip keys of station in removal process */
 939                 if (key->sta && key->sta->removed)
 940                         continue;
 941                 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 942                         continue;
 943
 944                 iter(hw, &sdata->vif,
 945                      key->sta ? &key->sta->sta : NULL,
 946                      &key->conf, iter_data);
 947         }
 948 }
 949
 950 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
 951                              struct ieee80211_vif *vif,
 952                              void (*iter)(struct ieee80211_hw *hw,
 953                                           struct ieee80211_vif *vif,
 954                                           struct ieee80211_sta *sta,
 955                                           struct ieee80211_key_conf *key,
 956                                           void *data),
 957                              void *iter_data)
 958 {
 959         struct ieee80211_local *local = hw_to_local(hw);
 960         struct ieee80211_sub_if_data *sdata;
 961
 962         if (vif) {
 963                 sdata = vif_to_sdata(vif);
 964                 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
 965         } else {
 966                 list_for_each_entry_rcu(sdata, &local->interfaces, list)
 967                         _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
 968         }
 969 }
 970 EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
 971
 972 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
 973                                       struct list_head *keys)
 974 {
 975         struct ieee80211_key *key, *tmp;
 976
 977         decrease_tailroom_need_count(sdata,
 978                                      sdata->crypto_tx_tailroom_pending_dec);
 979         sdata->crypto_tx_tailroom_pending_dec = 0;
 980
 981         ieee80211_debugfs_key_remove_mgmt_default(sdata);
 982
 983         list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
 984                 ieee80211_key_replace(key->sdata, key->sta,
 985                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 986                                 key, NULL);
 987                 list_add_tail(&key->list, keys);
 988         }
 989
 990         ieee80211_debugfs_key_update_default(sdata);
 991 }
 992
 993 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
 994                          bool force_synchronize)
 995 {
 996         struct ieee80211_local *local = sdata->local;
 997         struct ieee80211_sub_if_data *vlan;
 998         struct ieee80211_sub_if_data *master;
 999         struct ieee80211_key *key, *tmp;
1000         LIST_HEAD(keys);
1001
1002         cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
1003
1004         mutex_lock(&local->key_mtx);
1005
1006         ieee80211_free_keys_iface(sdata, &keys);
1007
1008         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1009                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1010                         ieee80211_free_keys_iface(vlan, &keys);
1011         }
1012
1013         if (!list_empty(&keys) || force_synchronize)
1014                 synchronize_net();
1015         list_for_each_entry_safe(key, tmp, &keys, list)
1016                 __ieee80211_key_destroy(key, false);
1017
1018         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1019                 if (sdata->bss) {
1020                         master = container_of(sdata->bss,
1021                                               struct ieee80211_sub_if_data,
1022                                               u.ap);
1023
1024                         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
1025                                      master->crypto_tx_tailroom_needed_cnt);
1026                 }
1027         } else {
1028                 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
1029                              sdata->crypto_tx_tailroom_pending_dec);
1030         }
1031
1032         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1033                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1034                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
1035                                      vlan->crypto_tx_tailroom_pending_dec);
1036         }
1037
1038         mutex_unlock(&local->key_mtx);
1039 }
1040
1041 void ieee80211_free_sta_keys(struct ieee80211_local *local,
1042                              struct sta_info *sta)
1043 {
1044         struct ieee80211_key *key;
1045         int i;
1046
1047         mutex_lock(&local->key_mtx);
1048         for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) {
1049                 key = key_mtx_dereference(local, sta->gtk[i]);
1050                 if (!key)
1051                         continue;
1052                 ieee80211_key_replace(key->sdata, key->sta,
1053                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1054                                 key, NULL);
1055                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1056                                         NL80211_IFTYPE_STATION);
1057         }
1058
1059         for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1060                 key = key_mtx_dereference(local, sta->ptk[i]);
1061                 if (!key)
1062                         continue;
1063                 ieee80211_key_replace(key->sdata, key->sta,
1064                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1065                                 key, NULL);
1066                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1067                                         NL80211_IFTYPE_STATION);
1068         }
1069
1070         mutex_unlock(&local->key_mtx);
1071 }
1072
1073 void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
1074 {
1075         struct ieee80211_sub_if_data *sdata;
1076
1077         sdata = container_of(wk, struct ieee80211_sub_if_data,
1078                              dec_tailroom_needed_wk.work);
1079
1080         /*
1081          * The reason for the delayed tailroom needed decrementing is to
1082          * make roaming faster: during roaming, all keys are first deleted
1083          * and then new keys are installed. The first new key causes the
1084          * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
1085          * the cost of synchronize_net() (which can be slow). Avoid this
1086          * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
1087          * key removal for a while, so if we roam the value is larger than
1088          * zero and no 0->1 transition happens.
1089          *
1090          * The cost is that if the AP switching was from an AP with keys
1091          * to one without, we still allocate tailroom while it would no
1092          * longer be needed. However, in the typical (fast) roaming case
1093          * within an ESS this usually won't happen.
1094          */
1095
1096         mutex_lock(&sdata->local->key_mtx);
1097         decrease_tailroom_need_count(sdata,
1098                                      sdata->crypto_tx_tailroom_pending_dec);
1099         sdata->crypto_tx_tailroom_pending_dec = 0;
1100         mutex_unlock(&sdata->local->key_mtx);
1101 }
1102
1103 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
1104                                 const u8 *replay_ctr, gfp_t gfp)
1105 {
1106         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1107
1108         trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
1109
1110         cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
1111 }
1112 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
1113
1114 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
1115                               int tid, struct ieee80211_key_seq *seq)
1116 {
1117         struct ieee80211_key *key;
1118         const u8 *pn;
1119
1120         key = container_of(keyconf, struct ieee80211_key, conf);
1121
1122         switch (key->conf.cipher) {
1123         case WLAN_CIPHER_SUITE_TKIP:
1124                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1125                         return;
1126                 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
1127                 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
1128                 break;
1129         case WLAN_CIPHER_SUITE_CCMP:
1130         case WLAN_CIPHER_SUITE_CCMP_256:
1131                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1132                         return;
1133                 if (tid < 0)
1134                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1135                 else
1136                         pn = key->u.ccmp.rx_pn[tid];
1137                 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
1138                 break;
1139         case WLAN_CIPHER_SUITE_AES_CMAC:
1140         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1141                 if (WARN_ON(tid != 0))
1142                         return;
1143                 pn = key->u.aes_cmac.rx_pn;
1144                 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
1145                 break;
1146         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1147         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1148                 if (WARN_ON(tid != 0))
1149                         return;
1150                 pn = key->u.aes_gmac.rx_pn;
1151                 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
1152                 break;
1153         case WLAN_CIPHER_SUITE_GCMP:
1154         case WLAN_CIPHER_SUITE_GCMP_256:
1155                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1156                         return;
1157                 if (tid < 0)
1158                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1159                 else
1160                         pn = key->u.gcmp.rx_pn[tid];
1161                 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
1162                 break;
1163         }
1164 }
1165 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
1166
1167 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1168                               int tid, struct ieee80211_key_seq *seq)
1169 {
1170         struct ieee80211_key *key;
1171         u8 *pn;
1172
1173         key = container_of(keyconf, struct ieee80211_key, conf);
1174
1175         switch (key->conf.cipher) {
1176         case WLAN_CIPHER_SUITE_TKIP:
1177                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1178                         return;
1179                 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1180                 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1181                 break;
1182         case WLAN_CIPHER_SUITE_CCMP:
1183         case WLAN_CIPHER_SUITE_CCMP_256:
1184                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1185                         return;
1186                 if (tid < 0)
1187                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1188                 else
1189                         pn = key->u.ccmp.rx_pn[tid];
1190                 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1191                 break;
1192         case WLAN_CIPHER_SUITE_AES_CMAC:
1193         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1194                 if (WARN_ON(tid != 0))
1195                         return;
1196                 pn = key->u.aes_cmac.rx_pn;
1197                 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1198                 break;
1199         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1200         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1201                 if (WARN_ON(tid != 0))
1202                         return;
1203                 pn = key->u.aes_gmac.rx_pn;
1204                 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1205                 break;
1206         case WLAN_CIPHER_SUITE_GCMP:
1207         case WLAN_CIPHER_SUITE_GCMP_256:
1208                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1209                         return;
1210                 if (tid < 0)
1211                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1212                 else
1213                         pn = key->u.gcmp.rx_pn[tid];
1214                 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1215                 break;
1216         default:
1217                 WARN_ON(1);
1218                 break;
1219         }
1220 }
1221 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1222
1223 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1224 {
1225         struct ieee80211_key *key;
1226
1227         key = container_of(keyconf, struct ieee80211_key, conf);
1228
1229         assert_key_lock(key->local);
1230
1231         /*
1232          * if key was uploaded, we assume the driver will/has remove(d)
1233          * it, so adjust bookkeeping accordingly
1234          */
1235         if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1236                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1237
1238                 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
1239                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
1240                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1241                         increment_tailroom_need_count(key->sdata);
1242         }
1243
1244         ieee80211_key_free(key, false);
1245 }
1246 EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1247
1248 struct ieee80211_key_conf *
1249 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1250                         struct ieee80211_key_conf *keyconf)
1251 {
1252         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1253         struct ieee80211_local *local = sdata->local;
1254         struct ieee80211_key *key;
1255         int err;
1256
1257         if (WARN_ON(!local->wowlan))
1258                 return ERR_PTR(-EINVAL);
1259
1260         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1261                 return ERR_PTR(-EINVAL);
1262
1263         key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1264                                   keyconf->keylen, keyconf->key,
1265                                   0, NULL, NULL);
1266         if (IS_ERR(key))
1267                 return ERR_CAST(key);
1268
1269         if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1270                 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1271
1272         err = ieee80211_key_link(key, sdata, NULL);
1273         if (err)
1274                 return ERR_PTR(err);
1275
1276         return &key->conf;
1277 }
1278 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);