net/mac80211/key.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2002-2005, Instant802 Networks, Inc.
   4  * Copyright 2005-2006, Devicescape Software, Inc.
   5  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   6  * Copyright 2007-2008  Johannes Berg <johannes@sipsolutions.net>
   7  * Copyright 2013-2014  Intel Mobile Communications GmbH
   8  * Copyright 2015-2017  Intel Deutschland GmbH
   9  * Copyright 2018-2020  Intel Corporation
  10  */
  11
  12 #include <linux/if_ether.h>
  13 #include <linux/etherdevice.h>
  14 #include <linux/list.h>
  15 #include <linux/rcupdate.h>
  16 #include <linux/rtnetlink.h>
  17 #include <linux/slab.h>
  18 #include <linux/export.h>
  19 #include <net/mac80211.h>
  20 #include <crypto/algapi.h>
  21 #include <asm/unaligned.h>
  22 #include "ieee80211_i.h"
  23 #include "driver-ops.h"
  24 #include "debugfs_key.h"
  25 #include "aes_ccm.h"
  26 #include "aes_cmac.h"
  27 #include "aes_gmac.h"
  28 #include "aes_gcm.h"
  29
  30
  31 /**
  32  * DOC: Key handling basics
  33  *
  34  * Key handling in mac80211 is done based on per-interface (sub_if_data)
  35  * keys and per-station keys. Since each station belongs to an interface,
  36  * each station key also belongs to that interface.
  37  *
  38  * Hardware acceleration is done on a best-effort basis for algorithms
  39  * that are implemented in software,  for each key the hardware is asked
  40  * to enable that key for offloading but if it cannot do that the key is
  41  * simply kept for software encryption (unless it is for an algorithm
  42  * that isn't implemented in software).
  43  * There is currently no way of knowing whether a key is handled in SW
  44  * or HW except by looking into debugfs.
  45  *
  46  * All key management is internally protected by a mutex. Within all
  47  * other parts of mac80211, key references are, just as STA structure
  48  * references, protected by RCU. Note, however, that some things are
  49  * unprotected, namely the key->sta dereferences within the hardware
  50  * acceleration functions. This means that sta_info_destroy() must
  51  * remove the key which waits for an RCU grace period.
  52  */
  53
  54 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
  55
  56 static void assert_key_lock(struct ieee80211_local *local)
  57 {
  58         lockdep_assert_held(&local->key_mtx);
  59 }
  60
  61 static void
  62 update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta)
  63 {
  64         struct ieee80211_sub_if_data *vlan;
  65
  66         if (sdata->vif.type != NL80211_IFTYPE_AP)
  67                 return;
  68
  69         /* crypto_tx_tailroom_needed_cnt is protected by this */
  70         assert_key_lock(sdata->local);
  71
  72         rcu_read_lock();
  73
  74         list_for_each_entry_rcu(vlan, &sdata->u.ap.vlans, u.vlan.list)
  75                 vlan->crypto_tx_tailroom_needed_cnt += delta;
  76
  77         rcu_read_unlock();
  78 }
  79
  80 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
  81 {
  82         /*
  83          * When this count is zero, SKB resizing for allocating tailroom
  84          * for IV or MMIC is skipped. But, this check has created two race
  85          * cases in xmit path while transiting from zero count to one:
  86          *
  87          * 1. SKB resize was skipped because no key was added but just before
  88          * the xmit key is added and SW encryption kicks off.
  89          *
  90          * 2. SKB resize was skipped because all the keys were hw planted but
  91          * just before xmit one of the key is deleted and SW encryption kicks
  92          * off.
  93          *
  94          * In both the above case SW encryption will find not enough space for
  95          * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
  96          *
  97          * Solution has been explained at
  98          * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
  99          */
 100
 101         assert_key_lock(sdata->local);
 102
 103         update_vlan_tailroom_need_count(sdata, 1);
 104
 105         if (!sdata->crypto_tx_tailroom_needed_cnt++) {
 106                 /*
 107                  * Flush all XMIT packets currently using HW encryption or no
 108                  * encryption at all if the count transition is from 0 -> 1.
 109                  */
 110                 synchronize_net();
 111         }
 112 }
 113
 114 static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata,
 115                                          int delta)
 116 {
 117         assert_key_lock(sdata->local);
 118
 119         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta);
 120
 121         update_vlan_tailroom_need_count(sdata, -delta);
 122         sdata->crypto_tx_tailroom_needed_cnt -= delta;
 123 }
 124
 125 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
 126 {
 127         struct ieee80211_sub_if_data *sdata = key->sdata;
 128         struct sta_info *sta;
 129         int ret = -EOPNOTSUPP;
 130
 131         might_sleep();
 132
 133         if (key->flags & KEY_FLAG_TAINTED) {
 134                 /* If we get here, it's during resume and the key is
 135                  * tainted so shouldn't be used/programmed any more.
 136                  * However, its flags may still indicate that it was
 137                  * programmed into the device (since we're in resume)
 138                  * so clear that flag now to avoid trying to remove
 139                  * it again later.
 140                  */
 141                 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE &&
 142                     !(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
 143                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
 144                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 145                         increment_tailroom_need_count(sdata);
 146
 147                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 148                 return -EINVAL;
 149         }
 150
 151         if (!key->local->ops->set_key)
 152                 goto out_unsupported;
 153
 154         assert_key_lock(key->local);
 155
 156         sta = key->sta;
 157
 158         /*
 159          * If this is a per-STA GTK, check if it
 160          * is supported; if not, return.
 161          */
 162         if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) &&
 163             !ieee80211_hw_check(&key->local->hw, SUPPORTS_PER_STA_GTK))
 164                 goto out_unsupported;
 165
 166         if (sta && !sta->uploaded)
 167                 goto out_unsupported;
 168
 169         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 170                 /*
 171                  * The driver doesn't know anything about VLAN interfaces.
 172                  * Hence, don't send GTKs for VLAN interfaces to the driver.
 173                  */
 174                 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
 175                         ret = 1;
 176                         goto out_unsupported;
 177                 }
 178         }
 179
 180         ret = drv_set_key(key->local, SET_KEY, sdata,
 181                           sta ? &sta->sta : NULL, &key->conf);
 182
 183         if (!ret) {
 184                 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
 185
 186                 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
 187                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
 188                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 189                         decrease_tailroom_need_count(sdata, 1);
 190
 191                 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
 192                         (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
 193
 194                 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) &&
 195                         (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC));
 196
 197                 return 0;
 198         }
 199
 200         if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1)
 201                 sdata_err(sdata,
 202                           "failed to set key (%d, %pM) to hardware (%d)\n",
 203                           key->conf.keyidx,
 204                           sta ? sta->sta.addr : bcast_addr, ret);
 205
 206  out_unsupported:
 207         switch (key->conf.cipher) {
 208         case WLAN_CIPHER_SUITE_WEP40:
 209         case WLAN_CIPHER_SUITE_WEP104:
 210         case WLAN_CIPHER_SUITE_TKIP:
 211         case WLAN_CIPHER_SUITE_CCMP:
 212         case WLAN_CIPHER_SUITE_CCMP_256:
 213         case WLAN_CIPHER_SUITE_GCMP:
 214         case WLAN_CIPHER_SUITE_GCMP_256:
 215         case WLAN_CIPHER_SUITE_AES_CMAC:
 216         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 217         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 218         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 219                 /* all of these we can do in software - if driver can */
 220                 if (ret == 1)
 221                         return 0;
 222                 if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL))
 223                         return -EINVAL;
 224                 return 0;
 225         default:
 226                 return -EINVAL;
 227         }
 228 }
 229
 230 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
 231 {
 232         struct ieee80211_sub_if_data *sdata;
 233         struct sta_info *sta;
 234         int ret;
 235
 236         might_sleep();
 237
 238         if (!key || !key->local->ops->set_key)
 239                 return;
 240
 241         assert_key_lock(key->local);
 242
 243         if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 244                 return;
 245
 246         sta = key->sta;
 247         sdata = key->sdata;
 248
 249         if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
 250                                  IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
 251                                  IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 252                 increment_tailroom_need_count(sdata);
 253
 254         key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 255         ret = drv_set_key(key->local, DISABLE_KEY, sdata,
 256                           sta ? &sta->sta : NULL, &key->conf);
 257
 258         if (ret)
 259                 sdata_err(sdata,
 260                           "failed to remove key (%d, %pM) from hardware (%d)\n",
 261                           key->conf.keyidx,
 262                           sta ? sta->sta.addr : bcast_addr, ret);
 263 }
 264
 265 static int _ieee80211_set_tx_key(struct ieee80211_key *key, bool force)
 266 {
 267         struct sta_info *sta = key->sta;
 268         struct ieee80211_local *local = key->local;
 269
 270         assert_key_lock(local);
 271
 272         set_sta_flag(sta, WLAN_STA_USES_ENCRYPTION);
 273
 274         sta->ptk_idx = key->conf.keyidx;
 275
 276         if (force || !ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT))
 277                 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
 278         ieee80211_check_fast_xmit(sta);
 279
 280         return 0;
 281 }
 282
 283 int ieee80211_set_tx_key(struct ieee80211_key *key)
 284 {
 285         return _ieee80211_set_tx_key(key, false);
 286 }
 287
 288 static void ieee80211_pairwise_rekey(struct ieee80211_key *old,
 289                                      struct ieee80211_key *new)
 290 {
 291         struct ieee80211_local *local = new->local;
 292         struct sta_info *sta = new->sta;
 293         int i;
 294
 295         assert_key_lock(local);
 296
 297         if (new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX) {
 298                 /* Extended Key ID key install, initial one or rekey */
 299
 300                 if (sta->ptk_idx != INVALID_PTK_KEYIDX &&
 301                     !ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT)) {
 302                         /* Aggregation Sessions with Extended Key ID must not
 303                          * mix MPDUs with different keyIDs within one A-MPDU.
 304                          * Tear down running Tx aggregation sessions and block
 305                          * new Rx/Tx aggregation requests during rekey to
 306                          * ensure there are no A-MPDUs when the driver is not
 307                          * supporting A-MPDU key borders. (Blocking Tx only
 308                          * would be sufficient but WLAN_STA_BLOCK_BA gets the
 309                          * job done for the few ms we need it.)
 310                          */
 311                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
 312                         mutex_lock(&sta->ampdu_mlme.mtx);
 313                         for (i = 0; i <  IEEE80211_NUM_TIDS; i++)
 314                                 ___ieee80211_stop_tx_ba_session(sta, i,
 315                                                                 AGG_STOP_LOCAL_REQUEST);
 316                         mutex_unlock(&sta->ampdu_mlme.mtx);
 317                 }
 318         } else if (old) {
 319                 /* Rekey without Extended Key ID.
 320                  * Aggregation sessions are OK when running on SW crypto.
 321                  * A broken remote STA may cause issues not observed with HW
 322                  * crypto, though.
 323                  */
 324                 if (!(old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 325                         return;
 326
 327                 /* Stop Tx till we are on the new key */
 328                 old->flags |= KEY_FLAG_TAINTED;
 329                 ieee80211_clear_fast_xmit(sta);
 330                 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
 331                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
 332                         ieee80211_sta_tear_down_BA_sessions(sta,
 333                                                             AGG_STOP_LOCAL_REQUEST);
 334                 }
 335                 if (!wiphy_ext_feature_isset(local->hw.wiphy,
 336                                              NL80211_EXT_FEATURE_CAN_REPLACE_PTK0)) {
 337                         pr_warn_ratelimited("Rekeying PTK for STA %pM but driver can't safely do that.",
 338                                             sta->sta.addr);
 339                         /* Flushing the driver queues *may* help prevent
 340                          * the clear text leaks and freezes.
 341                          */
 342                         ieee80211_flush_queues(local, old->sdata, false);
 343                 }
 344         }
 345 }
 346
 347 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
 348                                         int idx, bool uni, bool multi)
 349 {
 350         struct ieee80211_key *key = NULL;
 351
 352         assert_key_lock(sdata->local);
 353
 354         if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
 355                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 356
 357         if (uni) {
 358                 rcu_assign_pointer(sdata->default_unicast_key, key);
 359                 ieee80211_check_fast_xmit_iface(sdata);
 360                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
 361                         drv_set_default_unicast_key(sdata->local, sdata, idx);
 362         }
 363
 364         if (multi)
 365                 rcu_assign_pointer(sdata->default_multicast_key, key);
 366
 367         ieee80211_debugfs_key_update_default(sdata);
 368 }
 369
 370 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
 371                                bool uni, bool multi)
 372 {
 373         mutex_lock(&sdata->local->key_mtx);
 374         __ieee80211_set_default_key(sdata, idx, uni, multi);
 375         mutex_unlock(&sdata->local->key_mtx);
 376 }
 377
 378 static void
 379 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
 380 {
 381         struct ieee80211_key *key = NULL;
 382
 383         assert_key_lock(sdata->local);
 384
 385         if (idx >= NUM_DEFAULT_KEYS &&
 386             idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
 387                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 388
 389         rcu_assign_pointer(sdata->default_mgmt_key, key);
 390
 391         ieee80211_debugfs_key_update_default(sdata);
 392 }
 393
 394 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
 395                                     int idx)
 396 {
 397         mutex_lock(&sdata->local->key_mtx);
 398         __ieee80211_set_default_mgmt_key(sdata, idx);
 399         mutex_unlock(&sdata->local->key_mtx);
 400 }
 401
 402 static void
 403 __ieee80211_set_default_beacon_key(struct ieee80211_sub_if_data *sdata, int idx)
 404 {
 405         struct ieee80211_key *key = NULL;
 406
 407         assert_key_lock(sdata->local);
 408
 409         if (idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS &&
 410             idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
 411             NUM_DEFAULT_BEACON_KEYS)
 412                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 413
 414         rcu_assign_pointer(sdata->default_beacon_key, key);
 415
 416         ieee80211_debugfs_key_update_default(sdata);
 417 }
 418
 419 void ieee80211_set_default_beacon_key(struct ieee80211_sub_if_data *sdata,
 420                                       int idx)
 421 {
 422         mutex_lock(&sdata->local->key_mtx);
 423         __ieee80211_set_default_beacon_key(sdata, idx);
 424         mutex_unlock(&sdata->local->key_mtx);
 425 }
 426
 427 static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
 428                                   struct sta_info *sta,
 429                                   bool pairwise,
 430                                   struct ieee80211_key *old,
 431                                   struct ieee80211_key *new)
 432 {
 433         int idx;
 434         int ret = 0;
 435         bool defunikey, defmultikey, defmgmtkey, defbeaconkey;
 436
 437         /* caller must provide at least one old/new */
 438         if (WARN_ON(!new && !old))
 439                 return 0;
 440
 441         if (new)
 442                 list_add_tail_rcu(&new->list, &sdata->key_list);
 443
 444         WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
 445
 446         if (new && sta && pairwise) {
 447                 /* Unicast rekey needs special handling. With Extended Key ID
 448                  * old is still NULL for the first rekey.
 449                  */
 450                 ieee80211_pairwise_rekey(old, new);
 451         }
 452
 453         if (old) {
 454                 idx = old->conf.keyidx;
 455
 456                 if (old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
 457                         ieee80211_key_disable_hw_accel(old);
 458
 459                         if (new)
 460                                 ret = ieee80211_key_enable_hw_accel(new);
 461                 }
 462         } else {
 463                 /* new must be provided in case old is not */
 464                 idx = new->conf.keyidx;
 465                 if (!new->local->wowlan)
 466                         ret = ieee80211_key_enable_hw_accel(new);
 467         }
 468
 469         if (ret)
 470                 return ret;
 471
 472         if (sta) {
 473                 if (pairwise) {
 474                         rcu_assign_pointer(sta->ptk[idx], new);
 475                         if (new &&
 476                             !(new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX))
 477                                 _ieee80211_set_tx_key(new, true);
 478                 } else {
 479                         rcu_assign_pointer(sta->gtk[idx], new);
 480                 }
 481                 /* Only needed for transition from no key -> key.
 482                  * Still triggers unnecessary when using Extended Key ID
 483                  * and installing the second key ID the first time.
 484                  */
 485                 if (new && !old)
 486                         ieee80211_check_fast_rx(sta);
 487         } else {
 488                 defunikey = old &&
 489                         old == key_mtx_dereference(sdata->local,
 490                                                 sdata->default_unicast_key);
 491                 defmultikey = old &&
 492                         old == key_mtx_dereference(sdata->local,
 493                                                 sdata->default_multicast_key);
 494                 defmgmtkey = old &&
 495                         old == key_mtx_dereference(sdata->local,
 496                                                 sdata->default_mgmt_key);
 497                 defbeaconkey = old &&
 498                         old == key_mtx_dereference(sdata->local,
 499                                                    sdata->default_beacon_key);
 500
 501                 if (defunikey && !new)
 502                         __ieee80211_set_default_key(sdata, -1, true, false);
 503                 if (defmultikey && !new)
 504                         __ieee80211_set_default_key(sdata, -1, false, true);
 505                 if (defmgmtkey && !new)
 506                         __ieee80211_set_default_mgmt_key(sdata, -1);
 507                 if (defbeaconkey && !new)
 508                         __ieee80211_set_default_beacon_key(sdata, -1);
 509
 510                 rcu_assign_pointer(sdata->keys[idx], new);
 511                 if (defunikey && new)
 512                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 513                                                     true, false);
 514                 if (defmultikey && new)
 515                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 516                                                     false, true);
 517                 if (defmgmtkey && new)
 518                         __ieee80211_set_default_mgmt_key(sdata,
 519                                                          new->conf.keyidx);
 520                 if (defbeaconkey && new)
 521                         __ieee80211_set_default_beacon_key(sdata,
 522                                                            new->conf.keyidx);
 523         }
 524
 525         if (old)
 526                 list_del_rcu(&old->list);
 527
 528         return 0;
 529 }
 530
 531 struct ieee80211_key *
 532 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
 533                     const u8 *key_data,
 534                     size_t seq_len, const u8 *seq,
 535                     const struct ieee80211_cipher_scheme *cs)
 536 {
 537         struct ieee80211_key *key;
 538         int i, j, err;
 539
 540         if (WARN_ON(idx < 0 ||
 541                     idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
 542                     NUM_DEFAULT_BEACON_KEYS))
 543                 return ERR_PTR(-EINVAL);
 544
 545         key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
 546         if (!key)
 547                 return ERR_PTR(-ENOMEM);
 548
 549         /*
 550          * Default to software encryption; we'll later upload the
 551          * key to the hardware if possible.
 552          */
 553         key->conf.flags = 0;
 554         key->flags = 0;
 555
 556         key->conf.cipher = cipher;
 557         key->conf.keyidx = idx;
 558         key->conf.keylen = key_len;
 559         switch (cipher) {
 560         case WLAN_CIPHER_SUITE_WEP40:
 561         case WLAN_CIPHER_SUITE_WEP104:
 562                 key->conf.iv_len = IEEE80211_WEP_IV_LEN;
 563                 key->conf.icv_len = IEEE80211_WEP_ICV_LEN;
 564                 break;
 565         case WLAN_CIPHER_SUITE_TKIP:
 566                 key->conf.iv_len = IEEE80211_TKIP_IV_LEN;
 567                 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN;
 568                 if (seq) {
 569                         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
 570                                 key->u.tkip.rx[i].iv32 =
 571                                         get_unaligned_le32(&seq[2]);
 572                                 key->u.tkip.rx[i].iv16 =
 573                                         get_unaligned_le16(seq);
 574                         }
 575                 }
 576                 spin_lock_init(&key->u.tkip.txlock);
 577                 break;
 578         case WLAN_CIPHER_SUITE_CCMP:
 579                 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN;
 580                 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN;
 581                 if (seq) {
 582                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 583                                 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++)
 584                                         key->u.ccmp.rx_pn[i][j] =
 585                                                 seq[IEEE80211_CCMP_PN_LEN - j - 1];
 586                 }
 587                 /*
 588                  * Initialize AES key state here as an optimization so that
 589                  * it does not need to be initialized for every packet.
 590                  */
 591                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 592                         key_data, key_len, IEEE80211_CCMP_MIC_LEN);
 593                 if (IS_ERR(key->u.ccmp.tfm)) {
 594                         err = PTR_ERR(key->u.ccmp.tfm);
 595                         kfree(key);
 596                         return ERR_PTR(err);
 597                 }
 598                 break;
 599         case WLAN_CIPHER_SUITE_CCMP_256:
 600                 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN;
 601                 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN;
 602                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 603                         for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++)
 604                                 key->u.ccmp.rx_pn[i][j] =
 605                                         seq[IEEE80211_CCMP_256_PN_LEN - j - 1];
 606                 /* Initialize AES key state here as an optimization so that
 607                  * it does not need to be initialized for every packet.
 608                  */
 609                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 610                         key_data, key_len, IEEE80211_CCMP_256_MIC_LEN);
 611                 if (IS_ERR(key->u.ccmp.tfm)) {
 612                         err = PTR_ERR(key->u.ccmp.tfm);
 613                         kfree(key);
 614                         return ERR_PTR(err);
 615                 }
 616                 break;
 617         case WLAN_CIPHER_SUITE_AES_CMAC:
 618         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 619                 key->conf.iv_len = 0;
 620                 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
 621                         key->conf.icv_len = sizeof(struct ieee80211_mmie);
 622                 else
 623                         key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 624                 if (seq)
 625                         for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
 626                                 key->u.aes_cmac.rx_pn[j] =
 627                                         seq[IEEE80211_CMAC_PN_LEN - j - 1];
 628                 /*
 629                  * Initialize AES key state here as an optimization so that
 630                  * it does not need to be initialized for every packet.
 631                  */
 632                 key->u.aes_cmac.tfm =
 633                         ieee80211_aes_cmac_key_setup(key_data, key_len);
 634                 if (IS_ERR(key->u.aes_cmac.tfm)) {
 635                         err = PTR_ERR(key->u.aes_cmac.tfm);
 636                         kfree(key);
 637                         return ERR_PTR(err);
 638                 }
 639                 break;
 640         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 641         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 642                 key->conf.iv_len = 0;
 643                 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 644                 if (seq)
 645                         for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++)
 646                                 key->u.aes_gmac.rx_pn[j] =
 647                                         seq[IEEE80211_GMAC_PN_LEN - j - 1];
 648                 /* Initialize AES key state here as an optimization so that
 649                  * it does not need to be initialized for every packet.
 650                  */
 651                 key->u.aes_gmac.tfm =
 652                         ieee80211_aes_gmac_key_setup(key_data, key_len);
 653                 if (IS_ERR(key->u.aes_gmac.tfm)) {
 654                         err = PTR_ERR(key->u.aes_gmac.tfm);
 655                         kfree(key);
 656                         return ERR_PTR(err);
 657                 }
 658                 break;
 659         case WLAN_CIPHER_SUITE_GCMP:
 660         case WLAN_CIPHER_SUITE_GCMP_256:
 661                 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
 662                 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
 663                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 664                         for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
 665                                 key->u.gcmp.rx_pn[i][j] =
 666                                         seq[IEEE80211_GCMP_PN_LEN - j - 1];
 667                 /* Initialize AES key state here as an optimization so that
 668                  * it does not need to be initialized for every packet.
 669                  */
 670                 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
 671                                                                       key_len);
 672                 if (IS_ERR(key->u.gcmp.tfm)) {
 673                         err = PTR_ERR(key->u.gcmp.tfm);
 674                         kfree(key);
 675                         return ERR_PTR(err);
 676                 }
 677                 break;
 678         default:
 679                 if (cs) {
 680                         if (seq_len && seq_len != cs->pn_len) {
 681                                 kfree(key);
 682                                 return ERR_PTR(-EINVAL);
 683                         }
 684
 685                         key->conf.iv_len = cs->hdr_len;
 686                         key->conf.icv_len = cs->mic_len;
 687                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 688                                 for (j = 0; j < seq_len; j++)
 689                                         key->u.gen.rx_pn[i][j] =
 690                                                         seq[seq_len - j - 1];
 691                         key->flags |= KEY_FLAG_CIPHER_SCHEME;
 692                 }
 693         }
 694         memcpy(key->conf.key, key_data, key_len);
 695         INIT_LIST_HEAD(&key->list);
 696
 697         return key;
 698 }
 699
 700 static void ieee80211_key_free_common(struct ieee80211_key *key)
 701 {
 702         switch (key->conf.cipher) {
 703         case WLAN_CIPHER_SUITE_CCMP:
 704         case WLAN_CIPHER_SUITE_CCMP_256:
 705                 ieee80211_aes_key_free(key->u.ccmp.tfm);
 706                 break;
 707         case WLAN_CIPHER_SUITE_AES_CMAC:
 708         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 709                 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
 710                 break;
 711         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 712         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 713                 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm);
 714                 break;
 715         case WLAN_CIPHER_SUITE_GCMP:
 716         case WLAN_CIPHER_SUITE_GCMP_256:
 717                 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
 718                 break;
 719         }
 720         kfree_sensitive(key);
 721 }
 722
 723 static void __ieee80211_key_destroy(struct ieee80211_key *key,
 724                                     bool delay_tailroom)
 725 {
 726         if (key->local) {
 727                 struct ieee80211_sub_if_data *sdata = key->sdata;
 728
 729                 ieee80211_debugfs_key_remove(key);
 730
 731                 if (delay_tailroom) {
 732                         /* see ieee80211_delayed_tailroom_dec */
 733                         sdata->crypto_tx_tailroom_pending_dec++;
 734                         schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
 735                                               HZ/2);
 736                 } else {
 737                         decrease_tailroom_need_count(sdata, 1);
 738                 }
 739         }
 740
 741         ieee80211_key_free_common(key);
 742 }
 743
 744 static void ieee80211_key_destroy(struct ieee80211_key *key,
 745                                   bool delay_tailroom)
 746 {
 747         if (!key)
 748                 return;
 749
 750         /*
 751          * Synchronize so the TX path and rcu key iterators
 752          * can no longer be using this key before we free/remove it.
 753          */
 754         synchronize_net();
 755
 756         __ieee80211_key_destroy(key, delay_tailroom);
 757 }
 758
 759 void ieee80211_key_free_unused(struct ieee80211_key *key)
 760 {
 761         WARN_ON(key->sdata || key->local);
 762         ieee80211_key_free_common(key);
 763 }
 764
 765 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata,
 766                                     struct ieee80211_key *old,
 767                                     struct ieee80211_key *new)
 768 {
 769         u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP];
 770         u8 *tk_old, *tk_new;
 771
 772         if (!old || new->conf.keylen != old->conf.keylen)
 773                 return false;
 774
 775         tk_old = old->conf.key;
 776         tk_new = new->conf.key;
 777
 778         /*
 779          * In station mode, don't compare the TX MIC key, as it's never used
 780          * and offloaded rekeying may not care to send it to the host. This
 781          * is the case in iwlwifi, for example.
 782          */
 783         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 784             new->conf.cipher == WLAN_CIPHER_SUITE_TKIP &&
 785             new->conf.keylen == WLAN_KEY_LEN_TKIP &&
 786             !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
 787                 memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP);
 788                 memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP);
 789                 memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 790                 memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 791                 tk_old = tkip_old;
 792                 tk_new = tkip_new;
 793         }
 794
 795         return !crypto_memneq(tk_old, tk_new, new->conf.keylen);
 796 }
 797
 798 int ieee80211_key_link(struct ieee80211_key *key,
 799                        struct ieee80211_sub_if_data *sdata,
 800                        struct sta_info *sta)
 801 {
 802         struct ieee80211_key *old_key;
 803         int idx = key->conf.keyidx;
 804         bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
 805         /*
 806          * We want to delay tailroom updates only for station - in that
 807          * case it helps roaming speed, but in other cases it hurts and
 808          * can cause warnings to appear.
 809          */
 810         bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION;
 811         int ret = -EOPNOTSUPP;
 812
 813         mutex_lock(&sdata->local->key_mtx);
 814
 815         if (sta && pairwise) {
 816                 struct ieee80211_key *alt_key;
 817
 818                 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
 819                 alt_key = key_mtx_dereference(sdata->local, sta->ptk[idx ^ 1]);
 820
 821                 /* The rekey code assumes that the old and new key are using
 822                  * the same cipher. Enforce the assumption for pairwise keys.
 823                  */
 824                 if ((alt_key && alt_key->conf.cipher != key->conf.cipher) ||
 825                     (old_key && old_key->conf.cipher != key->conf.cipher))
 826                         goto out;
 827         } else if (sta) {
 828                 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
 829         } else {
 830                 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 831         }
 832
 833         /* Non-pairwise keys must also not switch the cipher on rekey */
 834         if (!pairwise) {
 835                 if (old_key && old_key->conf.cipher != key->conf.cipher)
 836                         goto out;
 837         }
 838
 839         /*
 840          * Silently accept key re-installation without really installing the
 841          * new version of the key to avoid nonce reuse or replay issues.
 842          */
 843         if (ieee80211_key_identical(sdata, old_key, key)) {
 844                 ieee80211_key_free_unused(key);
 845                 ret = 0;
 846                 goto out;
 847         }
 848
 849         key->local = sdata->local;
 850         key->sdata = sdata;
 851         key->sta = sta;
 852
 853         increment_tailroom_need_count(sdata);
 854
 855         ret = ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
 856
 857         if (!ret) {
 858                 ieee80211_debugfs_key_add(key);
 859                 ieee80211_key_destroy(old_key, delay_tailroom);
 860         } else {
 861                 ieee80211_key_free(key, delay_tailroom);
 862         }
 863
 864  out:
 865         mutex_unlock(&sdata->local->key_mtx);
 866
 867         return ret;
 868 }
 869
 870 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
 871 {
 872         if (!key)
 873                 return;
 874
 875         /*
 876          * Replace key with nothingness if it was ever used.
 877          */
 878         if (key->sdata)
 879                 ieee80211_key_replace(key->sdata, key->sta,
 880                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 881                                 key, NULL);
 882         ieee80211_key_destroy(key, delay_tailroom);
 883 }
 884
 885 void ieee80211_reenable_keys(struct ieee80211_sub_if_data *sdata)
 886 {
 887         struct ieee80211_key *key;
 888         struct ieee80211_sub_if_data *vlan;
 889
 890         ASSERT_RTNL();
 891
 892         mutex_lock(&sdata->local->key_mtx);
 893
 894         sdata->crypto_tx_tailroom_needed_cnt = 0;
 895         sdata->crypto_tx_tailroom_pending_dec = 0;
 896
 897         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 898                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
 899                         vlan->crypto_tx_tailroom_needed_cnt = 0;
 900                         vlan->crypto_tx_tailroom_pending_dec = 0;
 901                 }
 902         }
 903
 904         if (ieee80211_sdata_running(sdata)) {
 905                 list_for_each_entry(key, &sdata->key_list, list) {
 906                         increment_tailroom_need_count(sdata);
 907                         ieee80211_key_enable_hw_accel(key);
 908                 }
 909         }
 910
 911         mutex_unlock(&sdata->local->key_mtx);
 912 }
 913
 914 void ieee80211_iter_keys(struct ieee80211_hw *hw,
 915                          struct ieee80211_vif *vif,
 916                          void (*iter)(struct ieee80211_hw *hw,
 917                                       struct ieee80211_vif *vif,
 918                                       struct ieee80211_sta *sta,
 919                                       struct ieee80211_key_conf *key,
 920                                       void *data),
 921                          void *iter_data)
 922 {
 923         struct ieee80211_local *local = hw_to_local(hw);
 924         struct ieee80211_key *key, *tmp;
 925         struct ieee80211_sub_if_data *sdata;
 926
 927         ASSERT_RTNL();
 928
 929         mutex_lock(&local->key_mtx);
 930         if (vif) {
 931                 sdata = vif_to_sdata(vif);
 932                 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
 933                         iter(hw, &sdata->vif,
 934                              key->sta ? &key->sta->sta : NULL,
 935                              &key->conf, iter_data);
 936         } else {
 937                 list_for_each_entry(sdata, &local->interfaces, list)
 938                         list_for_each_entry_safe(key, tmp,
 939                                                  &sdata->key_list, list)
 940                                 iter(hw, &sdata->vif,
 941                                      key->sta ? &key->sta->sta : NULL,
 942                                      &key->conf, iter_data);
 943         }
 944         mutex_unlock(&local->key_mtx);
 945 }
 946 EXPORT_SYMBOL(ieee80211_iter_keys);
 947
 948 static void
 949 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
 950                          struct ieee80211_sub_if_data *sdata,
 951                          void (*iter)(struct ieee80211_hw *hw,
 952                                       struct ieee80211_vif *vif,
 953                                       struct ieee80211_sta *sta,
 954                                       struct ieee80211_key_conf *key,
 955                                       void *data),
 956                          void *iter_data)
 957 {
 958         struct ieee80211_key *key;
 959
 960         list_for_each_entry_rcu(key, &sdata->key_list, list) {
 961                 /* skip keys of station in removal process */
 962                 if (key->sta && key->sta->removed)
 963                         continue;
 964                 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 965                         continue;
 966
 967                 iter(hw, &sdata->vif,
 968                      key->sta ? &key->sta->sta : NULL,
 969                      &key->conf, iter_data);
 970         }
 971 }
 972
 973 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
 974                              struct ieee80211_vif *vif,
 975                              void (*iter)(struct ieee80211_hw *hw,
 976                                           struct ieee80211_vif *vif,
 977                                           struct ieee80211_sta *sta,
 978                                           struct ieee80211_key_conf *key,
 979                                           void *data),
 980                              void *iter_data)
 981 {
 982         struct ieee80211_local *local = hw_to_local(hw);
 983         struct ieee80211_sub_if_data *sdata;
 984
 985         if (vif) {
 986                 sdata = vif_to_sdata(vif);
 987                 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
 988         } else {
 989                 list_for_each_entry_rcu(sdata, &local->interfaces, list)
 990                         _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
 991         }
 992 }
 993 EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
 994
 995 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
 996                                       struct list_head *keys)
 997 {
 998         struct ieee80211_key *key, *tmp;
 999
1000         decrease_tailroom_need_count(sdata,
1001                                      sdata->crypto_tx_tailroom_pending_dec);
1002         sdata->crypto_tx_tailroom_pending_dec = 0;
1003
1004         ieee80211_debugfs_key_remove_mgmt_default(sdata);
1005         ieee80211_debugfs_key_remove_beacon_default(sdata);
1006
1007         list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
1008                 ieee80211_key_replace(key->sdata, key->sta,
1009                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1010                                 key, NULL);
1011                 list_add_tail(&key->list, keys);
1012         }
1013
1014         ieee80211_debugfs_key_update_default(sdata);
1015 }
1016
1017 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
1018                          bool force_synchronize)
1019 {
1020         struct ieee80211_local *local = sdata->local;
1021         struct ieee80211_sub_if_data *vlan;
1022         struct ieee80211_sub_if_data *master;
1023         struct ieee80211_key *key, *tmp;
1024         LIST_HEAD(keys);
1025
1026         cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
1027
1028         mutex_lock(&local->key_mtx);
1029
1030         ieee80211_free_keys_iface(sdata, &keys);
1031
1032         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1033                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1034                         ieee80211_free_keys_iface(vlan, &keys);
1035         }
1036
1037         if (!list_empty(&keys) || force_synchronize)
1038                 synchronize_net();
1039         list_for_each_entry_safe(key, tmp, &keys, list)
1040                 __ieee80211_key_destroy(key, false);
1041
1042         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1043                 if (sdata->bss) {
1044                         master = container_of(sdata->bss,
1045                                               struct ieee80211_sub_if_data,
1046                                               u.ap);
1047
1048                         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
1049                                      master->crypto_tx_tailroom_needed_cnt);
1050                 }
1051         } else {
1052                 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
1053                              sdata->crypto_tx_tailroom_pending_dec);
1054         }
1055
1056         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1057                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1058                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
1059                                      vlan->crypto_tx_tailroom_pending_dec);
1060         }
1061
1062         mutex_unlock(&local->key_mtx);
1063 }
1064
1065 void ieee80211_free_sta_keys(struct ieee80211_local *local,
1066                              struct sta_info *sta)
1067 {
1068         struct ieee80211_key *key;
1069         int i;
1070
1071         mutex_lock(&local->key_mtx);
1072         for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) {
1073                 key = key_mtx_dereference(local, sta->gtk[i]);
1074                 if (!key)
1075                         continue;
1076                 ieee80211_key_replace(key->sdata, key->sta,
1077                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1078                                 key, NULL);
1079                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1080                                         NL80211_IFTYPE_STATION);
1081         }
1082
1083         for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1084                 key = key_mtx_dereference(local, sta->ptk[i]);
1085                 if (!key)
1086                         continue;
1087                 ieee80211_key_replace(key->sdata, key->sta,
1088                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1089                                 key, NULL);
1090                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1091                                         NL80211_IFTYPE_STATION);
1092         }
1093
1094         mutex_unlock(&local->key_mtx);
1095 }
1096
1097 void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
1098 {
1099         struct ieee80211_sub_if_data *sdata;
1100
1101         sdata = container_of(wk, struct ieee80211_sub_if_data,
1102                              dec_tailroom_needed_wk.work);
1103
1104         /*
1105          * The reason for the delayed tailroom needed decrementing is to
1106          * make roaming faster: during roaming, all keys are first deleted
1107          * and then new keys are installed. The first new key causes the
1108          * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
1109          * the cost of synchronize_net() (which can be slow). Avoid this
1110          * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
1111          * key removal for a while, so if we roam the value is larger than
1112          * zero and no 0->1 transition happens.
1113          *
1114          * The cost is that if the AP switching was from an AP with keys
1115          * to one without, we still allocate tailroom while it would no
1116          * longer be needed. However, in the typical (fast) roaming case
1117          * within an ESS this usually won't happen.
1118          */
1119
1120         mutex_lock(&sdata->local->key_mtx);
1121         decrease_tailroom_need_count(sdata,
1122                                      sdata->crypto_tx_tailroom_pending_dec);
1123         sdata->crypto_tx_tailroom_pending_dec = 0;
1124         mutex_unlock(&sdata->local->key_mtx);
1125 }
1126
1127 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
1128                                 const u8 *replay_ctr, gfp_t gfp)
1129 {
1130         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1131
1132         trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
1133
1134         cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
1135 }
1136 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
1137
1138 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
1139                               int tid, struct ieee80211_key_seq *seq)
1140 {
1141         struct ieee80211_key *key;
1142         const u8 *pn;
1143
1144         key = container_of(keyconf, struct ieee80211_key, conf);
1145
1146         switch (key->conf.cipher) {
1147         case WLAN_CIPHER_SUITE_TKIP:
1148                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1149                         return;
1150                 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
1151                 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
1152                 break;
1153         case WLAN_CIPHER_SUITE_CCMP:
1154         case WLAN_CIPHER_SUITE_CCMP_256:
1155                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1156                         return;
1157                 if (tid < 0)
1158                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1159                 else
1160                         pn = key->u.ccmp.rx_pn[tid];
1161                 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
1162                 break;
1163         case WLAN_CIPHER_SUITE_AES_CMAC:
1164         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1165                 if (WARN_ON(tid != 0))
1166                         return;
1167                 pn = key->u.aes_cmac.rx_pn;
1168                 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
1169                 break;
1170         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1171         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1172                 if (WARN_ON(tid != 0))
1173                         return;
1174                 pn = key->u.aes_gmac.rx_pn;
1175                 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
1176                 break;
1177         case WLAN_CIPHER_SUITE_GCMP:
1178         case WLAN_CIPHER_SUITE_GCMP_256:
1179                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1180                         return;
1181                 if (tid < 0)
1182                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1183                 else
1184                         pn = key->u.gcmp.rx_pn[tid];
1185                 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
1186                 break;
1187         }
1188 }
1189 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
1190
1191 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1192                               int tid, struct ieee80211_key_seq *seq)
1193 {
1194         struct ieee80211_key *key;
1195         u8 *pn;
1196
1197         key = container_of(keyconf, struct ieee80211_key, conf);
1198
1199         switch (key->conf.cipher) {
1200         case WLAN_CIPHER_SUITE_TKIP:
1201                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1202                         return;
1203                 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1204                 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1205                 break;
1206         case WLAN_CIPHER_SUITE_CCMP:
1207         case WLAN_CIPHER_SUITE_CCMP_256:
1208                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1209                         return;
1210                 if (tid < 0)
1211                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1212                 else
1213                         pn = key->u.ccmp.rx_pn[tid];
1214                 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1215                 break;
1216         case WLAN_CIPHER_SUITE_AES_CMAC:
1217         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1218                 if (WARN_ON(tid != 0))
1219                         return;
1220                 pn = key->u.aes_cmac.rx_pn;
1221                 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1222                 break;
1223         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1224         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1225                 if (WARN_ON(tid != 0))
1226                         return;
1227                 pn = key->u.aes_gmac.rx_pn;
1228                 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1229                 break;
1230         case WLAN_CIPHER_SUITE_GCMP:
1231         case WLAN_CIPHER_SUITE_GCMP_256:
1232                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1233                         return;
1234                 if (tid < 0)
1235                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1236                 else
1237                         pn = key->u.gcmp.rx_pn[tid];
1238                 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1239                 break;
1240         default:
1241                 WARN_ON(1);
1242                 break;
1243         }
1244 }
1245 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1246
1247 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1248 {
1249         struct ieee80211_key *key;
1250
1251         key = container_of(keyconf, struct ieee80211_key, conf);
1252
1253         assert_key_lock(key->local);
1254
1255         /*
1256          * if key was uploaded, we assume the driver will/has remove(d)
1257          * it, so adjust bookkeeping accordingly
1258          */
1259         if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1260                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1261
1262                 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
1263                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
1264                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1265                         increment_tailroom_need_count(key->sdata);
1266         }
1267
1268         ieee80211_key_free(key, false);
1269 }
1270 EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1271
1272 struct ieee80211_key_conf *
1273 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1274                         struct ieee80211_key_conf *keyconf)
1275 {
1276         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1277         struct ieee80211_local *local = sdata->local;
1278         struct ieee80211_key *key;
1279         int err;
1280
1281         if (WARN_ON(!local->wowlan))
1282                 return ERR_PTR(-EINVAL);
1283
1284         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1285                 return ERR_PTR(-EINVAL);
1286
1287         key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1288                                   keyconf->keylen, keyconf->key,
1289                                   0, NULL, NULL);
1290         if (IS_ERR(key))
1291                 return ERR_CAST(key);
1292
1293         if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1294                 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1295
1296         err = ieee80211_key_link(key, sdata, NULL);
1297         if (err)
1298                 return ERR_PTR(err);
1299
1300         return &key->conf;
1301 }
1302 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);