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 <[email protected]>
   6  * Copyright 2007-2008  Johannes Berg <[email protected]>
   7  * Copyright 2013-2014  Intel Mobile Communications GmbH
   8  * Copyright 2015-2017  Intel Deutschland GmbH
   9  * Copyright 2018-2019  Intel Corporation
  10  */
  11
  12 #include <linux/if_ether.h>
  13 #include <linux/etherdevice.h>
  14 #include <linux/list.h>
  15 #include <linux/rcupdate.h>
  16 #include <linux/rtnetlink.h>
  17 #include <linux/slab.h>
  18 #include <linux/export.h>
  19 #include <net/mac80211.h>
  20 #include <crypto/algapi.h>
  21 #include <asm/unaligned.h>
  22 #include "ieee80211_i.h"
  23 #include "driver-ops.h"
  24 #include "debugfs_key.h"
  25 #include "aes_ccm.h"
  26 #include "aes_cmac.h"
  27 #include "aes_gmac.h"
  28 #include "aes_gcm.h"
  29
  30
  31 /**
  32  * DOC: Key handling basics
  33  *
  34  * Key handling in mac80211 is done based on per-interface (sub_if_data)
  35  * keys and per-station keys. Since each station belongs to an interface,
  36  * each station key also belongs to that interface.
  37  *
  38  * Hardware acceleration is done on a best-effort basis for algorithms
  39  * that are implemented in software,  for each key the hardware is asked
  40  * to enable that key for offloading but if it cannot do that the key is
  41  * simply kept for software encryption (unless it is for an algorithm
  42  * that isn't implemented in software).
  43  * There is currently no way of knowing whether a key is handled in SW
  44  * or HW except by looking into debugfs.
  45  *
  46  * All key management is internally protected by a mutex. Within all
  47  * other parts of mac80211, key references are, just as STA structure
  48  * references, protected by RCU. Note, however, that some things are
  49  * unprotected, namely the key->sta dereferences within the hardware
  50  * acceleration functions. This means that sta_info_destroy() must
  51  * remove the key which waits for an RCU grace period.
  52  */
  53
  54 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
  55
  56 static void assert_key_lock(struct ieee80211_local *local)
  57 {
  58         lockdep_assert_held(&local->key_mtx);
  59 }
  60
  61 static void
  62 update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta)
  63 {
  64         struct ieee80211_sub_if_data *vlan;
  65
  66         if (sdata->vif.type != NL80211_IFTYPE_AP)
  67                 return;
  68
  69         /* crypto_tx_tailroom_needed_cnt is protected by this */
  70         assert_key_lock(sdata->local);
  71
  72         rcu_read_lock();
  73
  74         list_for_each_entry_rcu(vlan, &sdata->u.ap.vlans, u.vlan.list)
  75                 vlan->crypto_tx_tailroom_needed_cnt += delta;
  76
  77         rcu_read_unlock();
  78 }
  79
  80 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
  81 {
  82         /*
  83          * When this count is zero, SKB resizing for allocating tailroom
  84          * for IV or MMIC is skipped. But, this check has created two race
  85          * cases in xmit path while transiting from zero count to one:
  86          *
  87          * 1. SKB resize was skipped because no key was added but just before
  88          * the xmit key is added and SW encryption kicks off.
  89          *
  90          * 2. SKB resize was skipped because all the keys were hw planted but
  91          * just before xmit one of the key is deleted and SW encryption kicks
  92          * off.
  93          *
  94          * In both the above case SW encryption will find not enough space for
  95          * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
  96          *
  97          * Solution has been explained at
  98          * http://mid.gmane.org/[email protected]
  99          */
 100
 101         assert_key_lock(sdata->local);
 102
 103         update_vlan_tailroom_need_count(sdata, 1);
 104
 105         if (!sdata->crypto_tx_tailroom_needed_cnt++) {
 106                 /*
 107                  * Flush all XMIT packets currently using HW encryption or no
 108                  * encryption at all if the count transition is from 0 -> 1.
 109                  */
 110                 synchronize_net();
 111         }
 112 }
 113
 114 static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata,
 115                                          int delta)
 116 {
 117         assert_key_lock(sdata->local);
 118
 119         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta);
 120
 121         update_vlan_tailroom_need_count(sdata, -delta);
 122         sdata->crypto_tx_tailroom_needed_cnt -= delta;
 123 }
 124
 125 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
 126 {
 127         struct ieee80211_sub_if_data *sdata = key->sdata;
 128         struct sta_info *sta;
 129         int ret = -EOPNOTSUPP;
 130
 131         might_sleep();
 132
 133         if (key->flags & KEY_FLAG_TAINTED) {
 134                 /* If we get here, it's during resume and the key is
 135                  * tainted so shouldn't be used/programmed any more.
 136                  * However, its flags may still indicate that it was
 137                  * programmed into the device (since we're in resume)
 138                  * so clear that flag now to avoid trying to remove
 139                  * it again later.
 140                  */
 141                 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE &&
 142                     !(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
 143                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
 144                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 145                         increment_tailroom_need_count(sdata);
 146
 147                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 148                 return -EINVAL;
 149         }
 150
 151         if (!key->local->ops->set_key)
 152                 goto out_unsupported;
 153
 154         assert_key_lock(key->local);
 155
 156         sta = key->sta;
 157
 158         /*
 159          * If this is a per-STA GTK, check if it
 160          * is supported; if not, return.
 161          */
 162         if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) &&
 163             !ieee80211_hw_check(&key->local->hw, SUPPORTS_PER_STA_GTK))
 164                 goto out_unsupported;
 165
 166         if (sta && !sta->uploaded)
 167                 goto out_unsupported;
 168
 169         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 170                 /*
 171                  * The driver doesn't know anything about VLAN interfaces.
 172                  * Hence, don't send GTKs for VLAN interfaces to the driver.
 173                  */
 174                 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
 175                         ret = 1;
 176                         goto out_unsupported;
 177                 }
 178         }
 179
 180         ret = drv_set_key(key->local, SET_KEY, sdata,
 181                           sta ? &sta->sta : NULL, &key->conf);
 182
 183         if (!ret) {
 184                 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
 185
 186                 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
 187                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
 188                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 189                         decrease_tailroom_need_count(sdata, 1);
 190
 191                 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
 192                         (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
 193
 194                 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) &&
 195                         (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC));
 196
 197                 return 0;
 198         }
 199
 200         if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1)
 201                 sdata_err(sdata,
 202                           "failed to set key (%d, %pM) to hardware (%d)\n",
 203                           key->conf.keyidx,
 204                           sta ? sta->sta.addr : bcast_addr, ret);
 205
 206  out_unsupported:
 207         switch (key->conf.cipher) {
 208         case WLAN_CIPHER_SUITE_WEP40:
 209         case WLAN_CIPHER_SUITE_WEP104:
 210         case WLAN_CIPHER_SUITE_TKIP:
 211         case WLAN_CIPHER_SUITE_CCMP:
 212         case WLAN_CIPHER_SUITE_CCMP_256:
 213         case WLAN_CIPHER_SUITE_AES_CMAC:
 214         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 215         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 216         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 217         case WLAN_CIPHER_SUITE_GCMP:
 218         case WLAN_CIPHER_SUITE_GCMP_256:
 219                 /* all of these we can do in software - if driver can */
 220                 if (ret == 1)
 221                         return 0;
 222                 if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL))
 223                         return -EINVAL;
 224                 return 0;
 225         default:
 226                 return -EINVAL;
 227         }
 228 }
 229
 230 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
 231 {
 232         struct ieee80211_sub_if_data *sdata;
 233         struct sta_info *sta;
 234         int ret;
 235
 236         might_sleep();
 237
 238         if (!key || !key->local->ops->set_key)
 239                 return;
 240
 241         assert_key_lock(key->local);
 242
 243         if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 244                 return;
 245
 246         sta = key->sta;
 247         sdata = key->sdata;
 248
 249         if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
 250                                  IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
 251                                  IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 252                 increment_tailroom_need_count(sdata);
 253
 254         key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 255         ret = drv_set_key(key->local, DISABLE_KEY, sdata,
 256                           sta ? &sta->sta : NULL, &key->conf);
 257
 258         if (ret)
 259                 sdata_err(sdata,
 260                           "failed to remove key (%d, %pM) from hardware (%d)\n",
 261                           key->conf.keyidx,
 262                           sta ? sta->sta.addr : bcast_addr, ret);
 263 }
 264
 265 int ieee80211_set_tx_key(struct ieee80211_key *key)
 266 {
 267         struct sta_info *sta = key->sta;
 268         struct ieee80211_local *local = key->local;
 269
 270         assert_key_lock(local);
 271
 272         sta->ptk_idx = key->conf.keyidx;
 273
 274         if (!ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT))
 275                 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
 276         ieee80211_check_fast_xmit(sta);
 277
 278         return 0;
 279 }
 280
 281 static void ieee80211_pairwise_rekey(struct ieee80211_key *old,
 282                                      struct ieee80211_key *new)
 283 {
 284         struct ieee80211_local *local = new->local;
 285         struct sta_info *sta = new->sta;
 286         int i;
 287
 288         assert_key_lock(local);
 289
 290         if (new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX) {
 291                 /* Extended Key ID key install, initial one or rekey */
 292
 293                 if (sta->ptk_idx != INVALID_PTK_KEYIDX &&
 294                     !ieee80211_hw_check(&local->hw, 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 running Tx aggregation sessions and block
 298                          * new Rx/Tx aggregation requests during rekey to
 299                          * ensure there are no A-MPDUs when the driver is not
 300                          * supporting A-MPDU key borders. (Blocking Tx only
 301                          * would be sufficient but WLAN_STA_BLOCK_BA gets the
 302                          * job done for the few ms we need it.)
 303                          */
 304                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
 305                         mutex_lock(&sta->ampdu_mlme.mtx);
 306                         for (i = 0; i <  IEEE80211_NUM_TIDS; i++)
 307                                 ___ieee80211_stop_tx_ba_session(sta, i,
 308                                                                 AGG_STOP_LOCAL_REQUEST);
 309                         mutex_unlock(&sta->ampdu_mlme.mtx);
 310                 }
 311         } else if (old) {
 312                 /* Rekey without Extended Key ID.
 313                  * Aggregation sessions are OK when running on SW crypto.
 314                  * A broken remote STA may cause issues not observed with HW
 315                  * crypto, though.
 316                  */
 317                 if (!(old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 318                         return;
 319
 320                 /* Stop Tx till we are on the new key */
 321                 old->flags |= KEY_FLAG_TAINTED;
 322                 ieee80211_clear_fast_xmit(sta);
 323                 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
 324                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
 325                         ieee80211_sta_tear_down_BA_sessions(sta,
 326                                                             AGG_STOP_LOCAL_REQUEST);
 327                 }
 328                 if (!wiphy_ext_feature_isset(local->hw.wiphy,
 329                                              NL80211_EXT_FEATURE_CAN_REPLACE_PTK0)) {
 330                         pr_warn_ratelimited("Rekeying PTK for STA %pM but driver can't safely do that.",
 331                                             sta->sta.addr);
 332                         /* Flushing the driver queues *may* help prevent
 333                          * the clear text leaks and freezes.
 334                          */
 335                         ieee80211_flush_queues(local, old->sdata, false);
 336                 }
 337         }
 338 }
 339
 340 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
 341                                         int idx, bool uni, bool multi)
 342 {
 343         struct ieee80211_key *key = NULL;
 344
 345         assert_key_lock(sdata->local);
 346
 347         if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
 348                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 349
 350         if (uni) {
 351                 rcu_assign_pointer(sdata->default_unicast_key, key);
 352                 ieee80211_check_fast_xmit_iface(sdata);
 353                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
 354                         drv_set_default_unicast_key(sdata->local, sdata, idx);
 355         }
 356
 357         if (multi)
 358                 rcu_assign_pointer(sdata->default_multicast_key, key);
 359
 360         ieee80211_debugfs_key_update_default(sdata);
 361 }
 362
 363 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
 364                                bool uni, bool multi)
 365 {
 366         mutex_lock(&sdata->local->key_mtx);
 367         __ieee80211_set_default_key(sdata, idx, uni, multi);
 368         mutex_unlock(&sdata->local->key_mtx);
 369 }
 370
 371 static void
 372 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
 373 {
 374         struct ieee80211_key *key = NULL;
 375
 376         assert_key_lock(sdata->local);
 377
 378         if (idx >= NUM_DEFAULT_KEYS &&
 379             idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
 380                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 381
 382         rcu_assign_pointer(sdata->default_mgmt_key, key);
 383
 384         ieee80211_debugfs_key_update_default(sdata);
 385 }
 386
 387 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
 388                                     int idx)
 389 {
 390         mutex_lock(&sdata->local->key_mtx);
 391         __ieee80211_set_default_mgmt_key(sdata, idx);
 392         mutex_unlock(&sdata->local->key_mtx);
 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 = 0;
 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 (new && sta && pairwise) {
 415                 /* Unicast rekey needs special handling. With Extended Key ID
 416                  * old is still NULL for the first rekey.
 417                  */
 418                 ieee80211_pairwise_rekey(old, new);
 419         }
 420
 421         if (old) {
 422                 idx = old->conf.keyidx;
 423
 424                 if (old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
 425                         ieee80211_key_disable_hw_accel(old);
 426
 427                         if (new)
 428                                 ret = ieee80211_key_enable_hw_accel(new);
 429                 }
 430         } else {
 431                 /* new must be provided in case old is not */
 432                 idx = new->conf.keyidx;
 433                 if (!new->local->wowlan)
 434                         ret = ieee80211_key_enable_hw_accel(new);
 435         }
 436
 437         if (ret)
 438                 return ret;
 439
 440         if (sta) {
 441                 if (pairwise) {
 442                         rcu_assign_pointer(sta->ptk[idx], new);
 443                         if (new &&
 444                             !(new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX)) {
 445                                 sta->ptk_idx = idx;
 446                                 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
 447                                 ieee80211_check_fast_xmit(sta);
 448                         }
 449                 } else {
 450                         rcu_assign_pointer(sta->gtk[idx], new);
 451                 }
 452                 /* Only needed for transition from no key -> key.
 453                  * Still triggers unnecessary when using Extended Key ID
 454                  * and installing the second key ID the first time.
 455                  */
 456                 if (new && !old)
 457                         ieee80211_check_fast_rx(sta);
 458         } else {
 459                 defunikey = old &&
 460                         old == key_mtx_dereference(sdata->local,
 461                                                 sdata->default_unicast_key);
 462                 defmultikey = old &&
 463                         old == key_mtx_dereference(sdata->local,
 464                                                 sdata->default_multicast_key);
 465                 defmgmtkey = old &&
 466                         old == key_mtx_dereference(sdata->local,
 467                                                 sdata->default_mgmt_key);
 468
 469                 if (defunikey && !new)
 470                         __ieee80211_set_default_key(sdata, -1, true, false);
 471                 if (defmultikey && !new)
 472                         __ieee80211_set_default_key(sdata, -1, false, true);
 473                 if (defmgmtkey && !new)
 474                         __ieee80211_set_default_mgmt_key(sdata, -1);
 475
 476                 rcu_assign_pointer(sdata->keys[idx], new);
 477                 if (defunikey && new)
 478                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 479                                                     true, false);
 480                 if (defmultikey && new)
 481                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 482                                                     false, true);
 483                 if (defmgmtkey && new)
 484                         __ieee80211_set_default_mgmt_key(sdata,
 485                                                          new->conf.keyidx);
 486         }
 487
 488         if (old)
 489                 list_del_rcu(&old->list);
 490
 491         return 0;
 492 }
 493
 494 struct ieee80211_key *
 495 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
 496                     const u8 *key_data,
 497                     size_t seq_len, const u8 *seq,
 498                     const struct ieee80211_cipher_scheme *cs)
 499 {
 500         struct ieee80211_key *key;
 501         int i, j, err;
 502
 503         if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS))
 504                 return ERR_PTR(-EINVAL);
 505
 506         key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
 507         if (!key)
 508                 return ERR_PTR(-ENOMEM);
 509
 510         /*
 511          * Default to software encryption; we'll later upload the
 512          * key to the hardware if possible.
 513          */
 514         key->conf.flags = 0;
 515         key->flags = 0;
 516
 517         key->conf.cipher = cipher;
 518         key->conf.keyidx = idx;
 519         key->conf.keylen = key_len;
 520         switch (cipher) {
 521         case WLAN_CIPHER_SUITE_WEP40:
 522         case WLAN_CIPHER_SUITE_WEP104:
 523                 key->conf.iv_len = IEEE80211_WEP_IV_LEN;
 524                 key->conf.icv_len = IEEE80211_WEP_ICV_LEN;
 525                 break;
 526         case WLAN_CIPHER_SUITE_TKIP:
 527                 key->conf.iv_len = IEEE80211_TKIP_IV_LEN;
 528                 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN;
 529                 if (seq) {
 530                         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
 531                                 key->u.tkip.rx[i].iv32 =
 532                                         get_unaligned_le32(&seq[2]);
 533                                 key->u.tkip.rx[i].iv16 =
 534                                         get_unaligned_le16(seq);
 535                         }
 536                 }
 537                 spin_lock_init(&key->u.tkip.txlock);
 538                 break;
 539         case WLAN_CIPHER_SUITE_CCMP:
 540                 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN;
 541                 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN;
 542                 if (seq) {
 543                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 544                                 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++)
 545                                         key->u.ccmp.rx_pn[i][j] =
 546                                                 seq[IEEE80211_CCMP_PN_LEN - j - 1];
 547                 }
 548                 /*
 549                  * Initialize AES key state here as an optimization so that
 550                  * it does not need to be initialized for every packet.
 551                  */
 552                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 553                         key_data, key_len, IEEE80211_CCMP_MIC_LEN);
 554                 if (IS_ERR(key->u.ccmp.tfm)) {
 555                         err = PTR_ERR(key->u.ccmp.tfm);
 556                         kfree(key);
 557                         return ERR_PTR(err);
 558                 }
 559                 break;
 560         case WLAN_CIPHER_SUITE_CCMP_256:
 561                 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN;
 562                 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN;
 563                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 564                         for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++)
 565                                 key->u.ccmp.rx_pn[i][j] =
 566                                         seq[IEEE80211_CCMP_256_PN_LEN - j - 1];
 567                 /* Initialize AES key state here as an optimization so that
 568                  * it does not need to be initialized for every packet.
 569                  */
 570                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 571                         key_data, key_len, IEEE80211_CCMP_256_MIC_LEN);
 572                 if (IS_ERR(key->u.ccmp.tfm)) {
 573                         err = PTR_ERR(key->u.ccmp.tfm);
 574                         kfree(key);
 575                         return ERR_PTR(err);
 576                 }
 577                 break;
 578         case WLAN_CIPHER_SUITE_AES_CMAC:
 579         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 580                 key->conf.iv_len = 0;
 581                 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
 582                         key->conf.icv_len = sizeof(struct ieee80211_mmie);
 583                 else
 584                         key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 585                 if (seq)
 586                         for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
 587                                 key->u.aes_cmac.rx_pn[j] =
 588                                         seq[IEEE80211_CMAC_PN_LEN - j - 1];
 589                 /*
 590                  * Initialize AES key state here as an optimization so that
 591                  * it does not need to be initialized for every packet.
 592                  */
 593                 key->u.aes_cmac.tfm =
 594                         ieee80211_aes_cmac_key_setup(key_data, key_len);
 595                 if (IS_ERR(key->u.aes_cmac.tfm)) {
 596                         err = PTR_ERR(key->u.aes_cmac.tfm);
 597                         kfree(key);
 598                         return ERR_PTR(err);
 599                 }
 600                 break;
 601         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 602         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 603                 key->conf.iv_len = 0;
 604                 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 605                 if (seq)
 606                         for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++)
 607                                 key->u.aes_gmac.rx_pn[j] =
 608                                         seq[IEEE80211_GMAC_PN_LEN - j - 1];
 609                 /* Initialize AES key state here as an optimization so that
 610                  * it does not need to be initialized for every packet.
 611                  */
 612                 key->u.aes_gmac.tfm =
 613                         ieee80211_aes_gmac_key_setup(key_data, key_len);
 614                 if (IS_ERR(key->u.aes_gmac.tfm)) {
 615                         err = PTR_ERR(key->u.aes_gmac.tfm);
 616                         kfree(key);
 617                         return ERR_PTR(err);
 618                 }
 619                 break;
 620         case WLAN_CIPHER_SUITE_GCMP:
 621         case WLAN_CIPHER_SUITE_GCMP_256:
 622                 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
 623                 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
 624                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 625                         for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
 626                                 key->u.gcmp.rx_pn[i][j] =
 627                                         seq[IEEE80211_GCMP_PN_LEN - j - 1];
 628                 /* Initialize AES key state here as an optimization so that
 629                  * it does not need to be initialized for every packet.
 630                  */
 631                 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
 632                                                                       key_len);
 633                 if (IS_ERR(key->u.gcmp.tfm)) {
 634                         err = PTR_ERR(key->u.gcmp.tfm);
 635                         kfree(key);
 636                         return ERR_PTR(err);
 637                 }
 638                 break;
 639         default:
 640                 if (cs) {
 641                         if (seq_len && seq_len != cs->pn_len) {
 642                                 kfree(key);
 643                                 return ERR_PTR(-EINVAL);
 644                         }
 645
 646                         key->conf.iv_len = cs->hdr_len;
 647                         key->conf.icv_len = cs->mic_len;
 648                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 649                                 for (j = 0; j < seq_len; j++)
 650                                         key->u.gen.rx_pn[i][j] =
 651                                                         seq[seq_len - j - 1];
 652                         key->flags |= KEY_FLAG_CIPHER_SCHEME;
 653                 }
 654         }
 655         memcpy(key->conf.key, key_data, key_len);
 656         INIT_LIST_HEAD(&key->list);
 657
 658         return key;
 659 }
 660
 661 static void ieee80211_key_free_common(struct ieee80211_key *key)
 662 {
 663         switch (key->conf.cipher) {
 664         case WLAN_CIPHER_SUITE_CCMP:
 665         case WLAN_CIPHER_SUITE_CCMP_256:
 666                 ieee80211_aes_key_free(key->u.ccmp.tfm);
 667                 break;
 668         case WLAN_CIPHER_SUITE_AES_CMAC:
 669         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 670                 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
 671                 break;
 672         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 673         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 674                 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm);
 675                 break;
 676         case WLAN_CIPHER_SUITE_GCMP:
 677         case WLAN_CIPHER_SUITE_GCMP_256:
 678                 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
 679                 break;
 680         }
 681         kzfree(key);
 682 }
 683
 684 static void __ieee80211_key_destroy(struct ieee80211_key *key,
 685                                     bool delay_tailroom)
 686 {
 687         if (key->local) {
 688                 struct ieee80211_sub_if_data *sdata = key->sdata;
 689
 690                 ieee80211_debugfs_key_remove(key);
 691
 692                 if (delay_tailroom) {
 693                         /* see ieee80211_delayed_tailroom_dec */
 694                         sdata->crypto_tx_tailroom_pending_dec++;
 695                         schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
 696                                               HZ/2);
 697                 } else {
 698                         decrease_tailroom_need_count(sdata, 1);
 699                 }
 700         }
 701
 702         ieee80211_key_free_common(key);
 703 }
 704
 705 static void ieee80211_key_destroy(struct ieee80211_key *key,
 706                                   bool delay_tailroom)
 707 {
 708         if (!key)
 709                 return;
 710
 711         /*
 712          * Synchronize so the TX path and rcu key iterators
 713          * can no longer be using this key before we free/remove it.
 714          */
 715         synchronize_net();
 716
 717         __ieee80211_key_destroy(key, delay_tailroom);
 718 }
 719
 720 void ieee80211_key_free_unused(struct ieee80211_key *key)
 721 {
 722         WARN_ON(key->sdata || key->local);
 723         ieee80211_key_free_common(key);
 724 }
 725
 726 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata,
 727                                     struct ieee80211_key *old,
 728                                     struct ieee80211_key *new)
 729 {
 730         u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP];
 731         u8 *tk_old, *tk_new;
 732
 733         if (!old || new->conf.keylen != old->conf.keylen)
 734                 return false;
 735
 736         tk_old = old->conf.key;
 737         tk_new = new->conf.key;
 738
 739         /*
 740          * In station mode, don't compare the TX MIC key, as it's never used
 741          * and offloaded rekeying may not care to send it to the host. This
 742          * is the case in iwlwifi, for example.
 743          */
 744         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 745             new->conf.cipher == WLAN_CIPHER_SUITE_TKIP &&
 746             new->conf.keylen == WLAN_KEY_LEN_TKIP &&
 747             !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
 748                 memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP);
 749                 memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP);
 750                 memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 751                 memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 752                 tk_old = tkip_old;
 753                 tk_new = tkip_new;
 754         }
 755
 756         return !crypto_memneq(tk_old, tk_new, new->conf.keylen);
 757 }
 758
 759 int ieee80211_key_link(struct ieee80211_key *key,
 760                        struct ieee80211_sub_if_data *sdata,
 761                        struct sta_info *sta)
 762 {
 763         struct ieee80211_key *old_key;
 764         int idx = key->conf.keyidx;
 765         bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
 766         /*
 767          * We want to delay tailroom updates only for station - in that
 768          * case it helps roaming speed, but in other cases it hurts and
 769          * can cause warnings to appear.
 770          */
 771         bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION;
 772         int ret = -EOPNOTSUPP;
 773
 774         mutex_lock(&sdata->local->key_mtx);
 775
 776         if (sta && pairwise) {
 777                 struct ieee80211_key *alt_key;
 778
 779                 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
 780                 alt_key = key_mtx_dereference(sdata->local, sta->ptk[idx ^ 1]);
 781
 782                 /* The rekey code assumes that the old and new key are using
 783                  * the same cipher. Enforce the assumption for pairwise keys.
 784                  */
 785                 if ((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 (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_reenable_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         mutex_lock(&sdata->local->key_mtx);
 854
 855         sdata->crypto_tx_tailroom_needed_cnt = 0;
 856         sdata->crypto_tx_tailroom_pending_dec = 0;
 857
 858         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 859                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
 860                         vlan->crypto_tx_tailroom_needed_cnt = 0;
 861                         vlan->crypto_tx_tailroom_pending_dec = 0;
 862                 }
 863         }
 864
 865         if (ieee80211_sdata_running(sdata)) {
 866                 list_for_each_entry(key, &sdata->key_list, list) {
 867                         increment_tailroom_need_count(sdata);
 868                         ieee80211_key_enable_hw_accel(key);
 869                 }
 870         }
 871
 872         mutex_unlock(&sdata->local->key_mtx);
 873 }
 874
 875 void ieee80211_iter_keys(struct ieee80211_hw *hw,
 876                          struct ieee80211_vif *vif,
 877                          void (*iter)(struct ieee80211_hw *hw,
 878                                       struct ieee80211_vif *vif,
 879                                       struct ieee80211_sta *sta,
 880                                       struct ieee80211_key_conf *key,
 881                                       void *data),
 882                          void *iter_data)
 883 {
 884         struct ieee80211_local *local = hw_to_local(hw);
 885         struct ieee80211_key *key, *tmp;
 886         struct ieee80211_sub_if_data *sdata;
 887
 888         ASSERT_RTNL();
 889
 890         mutex_lock(&local->key_mtx);
 891         if (vif) {
 892                 sdata = vif_to_sdata(vif);
 893                 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
 894                         iter(hw, &sdata->vif,
 895                              key->sta ? &key->sta->sta : NULL,
 896                              &key->conf, iter_data);
 897         } else {
 898                 list_for_each_entry(sdata, &local->interfaces, list)
 899                         list_for_each_entry_safe(key, tmp,
 900                                                  &sdata->key_list, list)
 901                                 iter(hw, &sdata->vif,
 902                                      key->sta ? &key->sta->sta : NULL,
 903                                      &key->conf, iter_data);
 904         }
 905         mutex_unlock(&local->key_mtx);
 906 }
 907 EXPORT_SYMBOL(ieee80211_iter_keys);
 908
 909 static void
 910 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
 911                          struct ieee80211_sub_if_data *sdata,
 912                          void (*iter)(struct ieee80211_hw *hw,
 913                                       struct ieee80211_vif *vif,
 914                                       struct ieee80211_sta *sta,
 915                                       struct ieee80211_key_conf *key,
 916                                       void *data),
 917                          void *iter_data)
 918 {
 919         struct ieee80211_key *key;
 920
 921         list_for_each_entry_rcu(key, &sdata->key_list, list) {
 922                 /* skip keys of station in removal process */
 923                 if (key->sta && key->sta->removed)
 924                         continue;
 925                 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 926                         continue;
 927
 928                 iter(hw, &sdata->vif,
 929                      key->sta ? &key->sta->sta : NULL,
 930                      &key->conf, iter_data);
 931         }
 932 }
 933
 934 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
 935                              struct ieee80211_vif *vif,
 936                              void (*iter)(struct ieee80211_hw *hw,
 937                                           struct ieee80211_vif *vif,
 938                                           struct ieee80211_sta *sta,
 939                                           struct ieee80211_key_conf *key,
 940                                           void *data),
 941                              void *iter_data)
 942 {
 943         struct ieee80211_local *local = hw_to_local(hw);
 944         struct ieee80211_sub_if_data *sdata;
 945
 946         if (vif) {
 947                 sdata = vif_to_sdata(vif);
 948                 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
 949         } else {
 950                 list_for_each_entry_rcu(sdata, &local->interfaces, list)
 951                         _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
 952         }
 953 }
 954 EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
 955
 956 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
 957                                       struct list_head *keys)
 958 {
 959         struct ieee80211_key *key, *tmp;
 960
 961         decrease_tailroom_need_count(sdata,
 962                                      sdata->crypto_tx_tailroom_pending_dec);
 963         sdata->crypto_tx_tailroom_pending_dec = 0;
 964
 965         ieee80211_debugfs_key_remove_mgmt_default(sdata);
 966
 967         list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
 968                 ieee80211_key_replace(key->sdata, key->sta,
 969                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 970                                 key, NULL);
 971                 list_add_tail(&key->list, keys);
 972         }
 973
 974         ieee80211_debugfs_key_update_default(sdata);
 975 }
 976
 977 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
 978                          bool force_synchronize)
 979 {
 980         struct ieee80211_local *local = sdata->local;
 981         struct ieee80211_sub_if_data *vlan;
 982         struct ieee80211_sub_if_data *master;
 983         struct ieee80211_key *key, *tmp;
 984         LIST_HEAD(keys);
 985
 986         cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
 987
 988         mutex_lock(&local->key_mtx);
 989
 990         ieee80211_free_keys_iface(sdata, &keys);
 991
 992         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 993                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 994                         ieee80211_free_keys_iface(vlan, &keys);
 995         }
 996
 997         if (!list_empty(&keys) || force_synchronize)
 998                 synchronize_net();
 999         list_for_each_entry_safe(key, tmp, &keys, list)
1000                 __ieee80211_key_destroy(key, false);
1001
1002         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1003                 if (sdata->bss) {
1004                         master = container_of(sdata->bss,
1005                                               struct ieee80211_sub_if_data,
1006                                               u.ap);
1007
1008                         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
1009                                      master->crypto_tx_tailroom_needed_cnt);
1010                 }
1011         } else {
1012                 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
1013                              sdata->crypto_tx_tailroom_pending_dec);
1014         }
1015
1016         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1017                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1018                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
1019                                      vlan->crypto_tx_tailroom_pending_dec);
1020         }
1021
1022         mutex_unlock(&local->key_mtx);
1023 }
1024
1025 void ieee80211_free_sta_keys(struct ieee80211_local *local,
1026                              struct sta_info *sta)
1027 {
1028         struct ieee80211_key *key;
1029         int i;
1030
1031         mutex_lock(&local->key_mtx);
1032         for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) {
1033                 key = key_mtx_dereference(local, sta->gtk[i]);
1034                 if (!key)
1035                         continue;
1036                 ieee80211_key_replace(key->sdata, key->sta,
1037                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1038                                 key, NULL);
1039                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1040                                         NL80211_IFTYPE_STATION);
1041         }
1042
1043         for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1044                 key = key_mtx_dereference(local, sta->ptk[i]);
1045                 if (!key)
1046                         continue;
1047                 ieee80211_key_replace(key->sdata, key->sta,
1048                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1049                                 key, NULL);
1050                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1051                                         NL80211_IFTYPE_STATION);
1052         }
1053
1054         mutex_unlock(&local->key_mtx);
1055 }
1056
1057 void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
1058 {
1059         struct ieee80211_sub_if_data *sdata;
1060
1061         sdata = container_of(wk, struct ieee80211_sub_if_data,
1062                              dec_tailroom_needed_wk.work);
1063
1064         /*
1065          * The reason for the delayed tailroom needed decrementing is to
1066          * make roaming faster: during roaming, all keys are first deleted
1067          * and then new keys are installed. The first new key causes the
1068          * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
1069          * the cost of synchronize_net() (which can be slow). Avoid this
1070          * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
1071          * key removal for a while, so if we roam the value is larger than
1072          * zero and no 0->1 transition happens.
1073          *
1074          * The cost is that if the AP switching was from an AP with keys
1075          * to one without, we still allocate tailroom while it would no
1076          * longer be needed. However, in the typical (fast) roaming case
1077          * within an ESS this usually won't happen.
1078          */
1079
1080         mutex_lock(&sdata->local->key_mtx);
1081         decrease_tailroom_need_count(sdata,
1082                                      sdata->crypto_tx_tailroom_pending_dec);
1083         sdata->crypto_tx_tailroom_pending_dec = 0;
1084         mutex_unlock(&sdata->local->key_mtx);
1085 }
1086
1087 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
1088                                 const u8 *replay_ctr, gfp_t gfp)
1089 {
1090         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1091
1092         trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
1093
1094         cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
1095 }
1096 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
1097
1098 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
1099                               int tid, struct ieee80211_key_seq *seq)
1100 {
1101         struct ieee80211_key *key;
1102         const u8 *pn;
1103
1104         key = container_of(keyconf, struct ieee80211_key, conf);
1105
1106         switch (key->conf.cipher) {
1107         case WLAN_CIPHER_SUITE_TKIP:
1108                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1109                         return;
1110                 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
1111                 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
1112                 break;
1113         case WLAN_CIPHER_SUITE_CCMP:
1114         case WLAN_CIPHER_SUITE_CCMP_256:
1115                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1116                         return;
1117                 if (tid < 0)
1118                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1119                 else
1120                         pn = key->u.ccmp.rx_pn[tid];
1121                 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
1122                 break;
1123         case WLAN_CIPHER_SUITE_AES_CMAC:
1124         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1125                 if (WARN_ON(tid != 0))
1126                         return;
1127                 pn = key->u.aes_cmac.rx_pn;
1128                 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
1129                 break;
1130         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1131         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1132                 if (WARN_ON(tid != 0))
1133                         return;
1134                 pn = key->u.aes_gmac.rx_pn;
1135                 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
1136                 break;
1137         case WLAN_CIPHER_SUITE_GCMP:
1138         case WLAN_CIPHER_SUITE_GCMP_256:
1139                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1140                         return;
1141                 if (tid < 0)
1142                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1143                 else
1144                         pn = key->u.gcmp.rx_pn[tid];
1145                 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
1146                 break;
1147         }
1148 }
1149 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
1150
1151 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1152                               int tid, struct ieee80211_key_seq *seq)
1153 {
1154         struct ieee80211_key *key;
1155         u8 *pn;
1156
1157         key = container_of(keyconf, struct ieee80211_key, conf);
1158
1159         switch (key->conf.cipher) {
1160         case WLAN_CIPHER_SUITE_TKIP:
1161                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1162                         return;
1163                 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1164                 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1165                 break;
1166         case WLAN_CIPHER_SUITE_CCMP:
1167         case WLAN_CIPHER_SUITE_CCMP_256:
1168                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1169                         return;
1170                 if (tid < 0)
1171                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1172                 else
1173                         pn = key->u.ccmp.rx_pn[tid];
1174                 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1175                 break;
1176         case WLAN_CIPHER_SUITE_AES_CMAC:
1177         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1178                 if (WARN_ON(tid != 0))
1179                         return;
1180                 pn = key->u.aes_cmac.rx_pn;
1181                 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1182                 break;
1183         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1184         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1185                 if (WARN_ON(tid != 0))
1186                         return;
1187                 pn = key->u.aes_gmac.rx_pn;
1188                 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1189                 break;
1190         case WLAN_CIPHER_SUITE_GCMP:
1191         case WLAN_CIPHER_SUITE_GCMP_256:
1192                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1193                         return;
1194                 if (tid < 0)
1195                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1196                 else
1197                         pn = key->u.gcmp.rx_pn[tid];
1198                 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1199                 break;
1200         default:
1201                 WARN_ON(1);
1202                 break;
1203         }
1204 }
1205 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1206
1207 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1208 {
1209         struct ieee80211_key *key;
1210
1211         key = container_of(keyconf, struct ieee80211_key, conf);
1212
1213         assert_key_lock(key->local);
1214
1215         /*
1216          * if key was uploaded, we assume the driver will/has remove(d)
1217          * it, so adjust bookkeeping accordingly
1218          */
1219         if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1220                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1221
1222                 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
1223                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
1224                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1225                         increment_tailroom_need_count(key->sdata);
1226         }
1227
1228         ieee80211_key_free(key, false);
1229 }
1230 EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1231
1232 struct ieee80211_key_conf *
1233 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1234                         struct ieee80211_key_conf *keyconf)
1235 {
1236         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1237         struct ieee80211_local *local = sdata->local;
1238         struct ieee80211_key *key;
1239         int err;
1240
1241         if (WARN_ON(!local->wowlan))
1242                 return ERR_PTR(-EINVAL);
1243
1244         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1245                 return ERR_PTR(-EINVAL);
1246
1247         key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1248                                   keyconf->keylen, keyconf->key,
1249                                   0, NULL, NULL);
1250         if (IS_ERR(key))
1251                 return ERR_CAST(key);
1252
1253         if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1254                 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1255
1256         err = ieee80211_key_link(key, sdata, NULL);
1257         if (err)
1258                 return ERR_PTR(err);
1259
1260         return &key->conf;
1261 }
1262 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);