net/mac80211/key.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2007-2008  Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  * Copyright 2015-2017  Intel Deutschland GmbH
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/if_ether.h>
  15 #include <linux/etherdevice.h>
  16 #include <linux/list.h>
  17 #include <linux/rcupdate.h>
  18 #include <linux/rtnetlink.h>
  19 #include <linux/slab.h>
  20 #include <linux/export.h>
  21 #include <net/mac80211.h>
  22 #include <crypto/algapi.h>
  23 #include <asm/unaligned.h>
  24 #include "ieee80211_i.h"
  25 #include "driver-ops.h"
  26 #include "debugfs_key.h"
  27 #include "aes_ccm.h"
  28 #include "aes_cmac.h"
  29 #include "aes_gmac.h"
  30 #include "aes_gcm.h"
  31
  32
  33 /**
  34  * DOC: Key handling basics
  35  *
  36  * Key handling in mac80211 is done based on per-interface (sub_if_data)
  37  * keys and per-station keys. Since each station belongs to an interface,
  38  * each station key also belongs to that interface.
  39  *
  40  * Hardware acceleration is done on a best-effort basis for algorithms
  41  * that are implemented in software,  for each key the hardware is asked
  42  * to enable that key for offloading but if it cannot do that the key is
  43  * simply kept for software encryption (unless it is for an algorithm
  44  * that isn't implemented in software).
  45  * There is currently no way of knowing whether a key is handled in SW
  46  * or HW except by looking into debugfs.
  47  *
  48  * All key management is internally protected by a mutex. Within all
  49  * other parts of mac80211, key references are, just as STA structure
  50  * references, protected by RCU. Note, however, that some things are
  51  * unprotected, namely the key->sta dereferences within the hardware
  52  * acceleration functions. This means that sta_info_destroy() must
  53  * remove the key which waits for an RCU grace period.
  54  */
  55
  56 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
  57
  58 static void assert_key_lock(struct ieee80211_local *local)
  59 {
  60         lockdep_assert_held(&local->key_mtx);
  61 }
  62
  63 static void
  64 update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta)
  65 {
  66         struct ieee80211_sub_if_data *vlan;
  67
  68         if (sdata->vif.type != NL80211_IFTYPE_AP)
  69                 return;
  70
  71         /* crypto_tx_tailroom_needed_cnt is protected by this */
  72         assert_key_lock(sdata->local);
  73
  74         rcu_read_lock();
  75
  76         list_for_each_entry_rcu(vlan, &sdata->u.ap.vlans, u.vlan.list)
  77                 vlan->crypto_tx_tailroom_needed_cnt += delta;
  78
  79         rcu_read_unlock();
  80 }
  81
  82 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
  83 {
  84         /*
  85          * When this count is zero, SKB resizing for allocating tailroom
  86          * for IV or MMIC is skipped. But, this check has created two race
  87          * cases in xmit path while transiting from zero count to one:
  88          *
  89          * 1. SKB resize was skipped because no key was added but just before
  90          * the xmit key is added and SW encryption kicks off.
  91          *
  92          * 2. SKB resize was skipped because all the keys were hw planted but
  93          * just before xmit one of the key is deleted and SW encryption kicks
  94          * off.
  95          *
  96          * In both the above case SW encryption will find not enough space for
  97          * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
  98          *
  99          * Solution has been explained at
 100          * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
 101          */
 102
 103         assert_key_lock(sdata->local);
 104
 105         update_vlan_tailroom_need_count(sdata, 1);
 106
 107         if (!sdata->crypto_tx_tailroom_needed_cnt++) {
 108                 /*
 109                  * Flush all XMIT packets currently using HW encryption or no
 110                  * encryption at all if the count transition is from 0 -> 1.
 111                  */
 112                 synchronize_net();
 113         }
 114 }
 115
 116 static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata,
 117                                          int delta)
 118 {
 119         assert_key_lock(sdata->local);
 120
 121         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta);
 122
 123         update_vlan_tailroom_need_count(sdata, -delta);
 124         sdata->crypto_tx_tailroom_needed_cnt -= delta;
 125 }
 126
 127 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
 128 {
 129         struct ieee80211_sub_if_data *sdata = key->sdata;
 130         struct sta_info *sta;
 131         int ret = -EOPNOTSUPP;
 132
 133         might_sleep();
 134
 135         if (key->flags & KEY_FLAG_TAINTED) {
 136                 /* If we get here, it's during resume and the key is
 137                  * tainted so shouldn't be used/programmed any more.
 138                  * However, its flags may still indicate that it was
 139                  * programmed into the device (since we're in resume)
 140                  * so clear that flag now to avoid trying to remove
 141                  * it again later.
 142                  */
 143                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 144                 return -EINVAL;
 145         }
 146
 147         if (!key->local->ops->set_key)
 148                 goto out_unsupported;
 149
 150         assert_key_lock(key->local);
 151
 152         sta = key->sta;
 153
 154         /*
 155          * If this is a per-STA GTK, check if it
 156          * is supported; if not, return.
 157          */
 158         if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) &&
 159             !ieee80211_hw_check(&key->local->hw, SUPPORTS_PER_STA_GTK))
 160                 goto out_unsupported;
 161
 162         if (sta && !sta->uploaded)
 163                 goto out_unsupported;
 164
 165         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 166                 /*
 167                  * The driver doesn't know anything about VLAN interfaces.
 168                  * Hence, don't send GTKs for VLAN interfaces to the driver.
 169                  */
 170                 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE))
 171                         goto out_unsupported;
 172         }
 173
 174         ret = drv_set_key(key->local, SET_KEY, sdata,
 175                           sta ? &sta->sta : NULL, &key->conf);
 176
 177         if (!ret) {
 178                 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
 179
 180                 if (!((key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
 181                                            IEEE80211_KEY_FLAG_PUT_MIC_SPACE)) ||
 182                       (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 183                         decrease_tailroom_need_count(sdata, 1);
 184
 185                 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
 186                         (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
 187
 188                 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) &&
 189                         (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC));
 190
 191                 return 0;
 192         }
 193
 194         if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1)
 195                 sdata_err(sdata,
 196                           "failed to set key (%d, %pM) to hardware (%d)\n",
 197                           key->conf.keyidx,
 198                           sta ? sta->sta.addr : bcast_addr, ret);
 199
 200  out_unsupported:
 201         switch (key->conf.cipher) {
 202         case WLAN_CIPHER_SUITE_WEP40:
 203         case WLAN_CIPHER_SUITE_WEP104:
 204         case WLAN_CIPHER_SUITE_TKIP:
 205         case WLAN_CIPHER_SUITE_CCMP:
 206         case WLAN_CIPHER_SUITE_CCMP_256:
 207         case WLAN_CIPHER_SUITE_AES_CMAC:
 208         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 209         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 210         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 211         case WLAN_CIPHER_SUITE_GCMP:
 212         case WLAN_CIPHER_SUITE_GCMP_256:
 213                 /* all of these we can do in software - if driver can */
 214                 if (ret == 1)
 215                         return 0;
 216                 if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL)) {
 217                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 218                                 return 0;
 219                         return -EINVAL;
 220                 }
 221                 return 0;
 222         default:
 223                 return -EINVAL;
 224         }
 225 }
 226
 227 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
 228 {
 229         struct ieee80211_sub_if_data *sdata;
 230         struct sta_info *sta;
 231         int ret;
 232
 233         might_sleep();
 234
 235         if (!key || !key->local->ops->set_key)
 236                 return;
 237
 238         assert_key_lock(key->local);
 239
 240         if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 241                 return;
 242
 243         sta = key->sta;
 244         sdata = key->sdata;
 245
 246         if (!((key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
 247                                    IEEE80211_KEY_FLAG_PUT_MIC_SPACE)) ||
 248               (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 249                 increment_tailroom_need_count(sdata);
 250
 251         key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 252         ret = drv_set_key(key->local, DISABLE_KEY, sdata,
 253                           sta ? &sta->sta : NULL, &key->conf);
 254
 255         if (ret)
 256                 sdata_err(sdata,
 257                           "failed to remove key (%d, %pM) from hardware (%d)\n",
 258                           key->conf.keyidx,
 259                           sta ? sta->sta.addr : bcast_addr, ret);
 260 }
 261
 262 static int ieee80211_hw_key_replace(struct ieee80211_key *old_key,
 263                                     struct ieee80211_key *new_key,
 264                                     bool ptk0rekey)
 265 {
 266         struct ieee80211_sub_if_data *sdata;
 267         struct ieee80211_local *local;
 268         struct sta_info *sta;
 269         int ret;
 270
 271         /* Aggregation sessions are OK when running on SW crypto.
 272          * A broken remote STA may cause issues not observed with HW
 273          * crypto, though.
 274          */
 275         if (!(old_key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 276                 return 0;
 277
 278         assert_key_lock(old_key->local);
 279         sta = old_key->sta;
 280
 281         /* PTK only using key ID 0 needs special handling on rekey */
 282         if (new_key && sta && ptk0rekey) {
 283                 local = old_key->local;
 284                 sdata = old_key->sdata;
 285
 286                 /* Stop TX till we are on the new key */
 287                 old_key->flags |= KEY_FLAG_TAINTED;
 288                 ieee80211_clear_fast_xmit(sta);
 289
 290                 /* Aggregation sessions during rekey are complicated due to the
 291                  * reorder buffer and retransmits. Side step that by blocking
 292                  * aggregation during rekey and tear down running sessions.
 293                  */
 294                 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
 295                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
 296                         ieee80211_sta_tear_down_BA_sessions(sta,
 297                                                             AGG_STOP_LOCAL_REQUEST);
 298                 }
 299
 300                 if (!wiphy_ext_feature_isset(local->hw.wiphy,
 301                                              NL80211_EXT_FEATURE_CAN_REPLACE_PTK0)) {
 302                         pr_warn_ratelimited("Rekeying PTK for STA %pM but driver can't safely do that.",
 303                                             sta->sta.addr);
 304                         /* Flushing the driver queues *may* help prevent
 305                          * the clear text leaks and freezes.
 306                          */
 307                         ieee80211_flush_queues(local, sdata, false);
 308                 }
 309         }
 310
 311         ieee80211_key_disable_hw_accel(old_key);
 312
 313         if (new_key)
 314                 ret = ieee80211_key_enable_hw_accel(new_key);
 315         else
 316                 ret = 0;
 317
 318         return ret;
 319 }
 320
 321 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
 322                                         int idx, bool uni, bool multi)
 323 {
 324         struct ieee80211_key *key = NULL;
 325
 326         assert_key_lock(sdata->local);
 327
 328         if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
 329                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 330
 331         if (uni) {
 332                 rcu_assign_pointer(sdata->default_unicast_key, key);
 333                 ieee80211_check_fast_xmit_iface(sdata);
 334                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
 335                         drv_set_default_unicast_key(sdata->local, sdata, idx);
 336         }
 337
 338         if (multi)
 339                 rcu_assign_pointer(sdata->default_multicast_key, key);
 340
 341         ieee80211_debugfs_key_update_default(sdata);
 342 }
 343
 344 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
 345                                bool uni, bool multi)
 346 {
 347         mutex_lock(&sdata->local->key_mtx);
 348         __ieee80211_set_default_key(sdata, idx, uni, multi);
 349         mutex_unlock(&sdata->local->key_mtx);
 350 }
 351
 352 static void
 353 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
 354 {
 355         struct ieee80211_key *key = NULL;
 356
 357         assert_key_lock(sdata->local);
 358
 359         if (idx >= NUM_DEFAULT_KEYS &&
 360             idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
 361                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 362
 363         rcu_assign_pointer(sdata->default_mgmt_key, key);
 364
 365         ieee80211_debugfs_key_update_default(sdata);
 366 }
 367
 368 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
 369                                     int idx)
 370 {
 371         mutex_lock(&sdata->local->key_mtx);
 372         __ieee80211_set_default_mgmt_key(sdata, idx);
 373         mutex_unlock(&sdata->local->key_mtx);
 374 }
 375
 376
 377 static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
 378                                   struct sta_info *sta,
 379                                   bool pairwise,
 380                                   struct ieee80211_key *old,
 381                                   struct ieee80211_key *new)
 382 {
 383         int idx;
 384         int ret;
 385         bool defunikey, defmultikey, defmgmtkey;
 386
 387         /* caller must provide at least one old/new */
 388         if (WARN_ON(!new && !old))
 389                 return 0;
 390
 391         if (new)
 392                 list_add_tail_rcu(&new->list, &sdata->key_list);
 393
 394         WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
 395
 396         if (old) {
 397                 idx = old->conf.keyidx;
 398                 /* TODO: proper implement and test "Extended Key ID for
 399                  * Individually Addressed Frames" from IEEE 802.11-2016.
 400                  * Till then always assume only key ID 0 is used for
 401                  * pairwise keys.*/
 402                 ret = ieee80211_hw_key_replace(old, new, pairwise);
 403         } else {
 404                 /* new must be provided in case old is not */
 405                 idx = new->conf.keyidx;
 406                 if (!new->local->wowlan)
 407                         ret = ieee80211_key_enable_hw_accel(new);
 408                 else
 409                         ret = 0;
 410         }
 411
 412         if (ret)
 413                 return ret;
 414
 415         if (sta) {
 416                 if (pairwise) {
 417                         rcu_assign_pointer(sta->ptk[idx], new);
 418                         sta->ptk_idx = idx;
 419                         if (new) {
 420                                 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
 421                                 ieee80211_check_fast_xmit(sta);
 422                         }
 423                 } else {
 424                         rcu_assign_pointer(sta->gtk[idx], new);
 425                 }
 426                 if (new)
 427                         ieee80211_check_fast_rx(sta);
 428         } else {
 429                 defunikey = old &&
 430                         old == key_mtx_dereference(sdata->local,
 431                                                 sdata->default_unicast_key);
 432                 defmultikey = old &&
 433                         old == key_mtx_dereference(sdata->local,
 434                                                 sdata->default_multicast_key);
 435                 defmgmtkey = old &&
 436                         old == key_mtx_dereference(sdata->local,
 437                                                 sdata->default_mgmt_key);
 438
 439                 if (defunikey && !new)
 440                         __ieee80211_set_default_key(sdata, -1, true, false);
 441                 if (defmultikey && !new)
 442                         __ieee80211_set_default_key(sdata, -1, false, true);
 443                 if (defmgmtkey && !new)
 444                         __ieee80211_set_default_mgmt_key(sdata, -1);
 445
 446                 rcu_assign_pointer(sdata->keys[idx], new);
 447                 if (defunikey && new)
 448                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 449                                                     true, false);
 450                 if (defmultikey && new)
 451                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 452                                                     false, true);
 453                 if (defmgmtkey && new)
 454                         __ieee80211_set_default_mgmt_key(sdata,
 455                                                          new->conf.keyidx);
 456         }
 457
 458         if (old)
 459                 list_del_rcu(&old->list);
 460
 461         return 0;
 462 }
 463
 464 struct ieee80211_key *
 465 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
 466                     const u8 *key_data,
 467                     size_t seq_len, const u8 *seq,
 468                     const struct ieee80211_cipher_scheme *cs)
 469 {
 470         struct ieee80211_key *key;
 471         int i, j, err;
 472
 473         if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS))
 474                 return ERR_PTR(-EINVAL);
 475
 476         key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
 477         if (!key)
 478                 return ERR_PTR(-ENOMEM);
 479
 480         /*
 481          * Default to software encryption; we'll later upload the
 482          * key to the hardware if possible.
 483          */
 484         key->conf.flags = 0;
 485         key->flags = 0;
 486
 487         key->conf.cipher = cipher;
 488         key->conf.keyidx = idx;
 489         key->conf.keylen = key_len;
 490         switch (cipher) {
 491         case WLAN_CIPHER_SUITE_WEP40:
 492         case WLAN_CIPHER_SUITE_WEP104:
 493                 key->conf.iv_len = IEEE80211_WEP_IV_LEN;
 494                 key->conf.icv_len = IEEE80211_WEP_ICV_LEN;
 495                 break;
 496         case WLAN_CIPHER_SUITE_TKIP:
 497                 key->conf.iv_len = IEEE80211_TKIP_IV_LEN;
 498                 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN;
 499                 if (seq) {
 500                         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
 501                                 key->u.tkip.rx[i].iv32 =
 502                                         get_unaligned_le32(&seq[2]);
 503                                 key->u.tkip.rx[i].iv16 =
 504                                         get_unaligned_le16(seq);
 505                         }
 506                 }
 507                 spin_lock_init(&key->u.tkip.txlock);
 508                 break;
 509         case WLAN_CIPHER_SUITE_CCMP:
 510                 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN;
 511                 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN;
 512                 if (seq) {
 513                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 514                                 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++)
 515                                         key->u.ccmp.rx_pn[i][j] =
 516                                                 seq[IEEE80211_CCMP_PN_LEN - j - 1];
 517                 }
 518                 /*
 519                  * Initialize AES key state here as an optimization so that
 520                  * it does not need to be initialized for every packet.
 521                  */
 522                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 523                         key_data, key_len, IEEE80211_CCMP_MIC_LEN);
 524                 if (IS_ERR(key->u.ccmp.tfm)) {
 525                         err = PTR_ERR(key->u.ccmp.tfm);
 526                         kfree(key);
 527                         return ERR_PTR(err);
 528                 }
 529                 break;
 530         case WLAN_CIPHER_SUITE_CCMP_256:
 531                 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN;
 532                 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN;
 533                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 534                         for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++)
 535                                 key->u.ccmp.rx_pn[i][j] =
 536                                         seq[IEEE80211_CCMP_256_PN_LEN - j - 1];
 537                 /* Initialize AES key state here as an optimization so that
 538                  * it does not need to be initialized for every packet.
 539                  */
 540                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 541                         key_data, key_len, IEEE80211_CCMP_256_MIC_LEN);
 542                 if (IS_ERR(key->u.ccmp.tfm)) {
 543                         err = PTR_ERR(key->u.ccmp.tfm);
 544                         kfree(key);
 545                         return ERR_PTR(err);
 546                 }
 547                 break;
 548         case WLAN_CIPHER_SUITE_AES_CMAC:
 549         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 550                 key->conf.iv_len = 0;
 551                 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
 552                         key->conf.icv_len = sizeof(struct ieee80211_mmie);
 553                 else
 554                         key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 555                 if (seq)
 556                         for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
 557                                 key->u.aes_cmac.rx_pn[j] =
 558                                         seq[IEEE80211_CMAC_PN_LEN - j - 1];
 559                 /*
 560                  * Initialize AES key state here as an optimization so that
 561                  * it does not need to be initialized for every packet.
 562                  */
 563                 key->u.aes_cmac.tfm =
 564                         ieee80211_aes_cmac_key_setup(key_data, key_len);
 565                 if (IS_ERR(key->u.aes_cmac.tfm)) {
 566                         err = PTR_ERR(key->u.aes_cmac.tfm);
 567                         kfree(key);
 568                         return ERR_PTR(err);
 569                 }
 570                 break;
 571         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 572         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 573                 key->conf.iv_len = 0;
 574                 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 575                 if (seq)
 576                         for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++)
 577                                 key->u.aes_gmac.rx_pn[j] =
 578                                         seq[IEEE80211_GMAC_PN_LEN - j - 1];
 579                 /* Initialize AES key state here as an optimization so that
 580                  * it does not need to be initialized for every packet.
 581                  */
 582                 key->u.aes_gmac.tfm =
 583                         ieee80211_aes_gmac_key_setup(key_data, key_len);
 584                 if (IS_ERR(key->u.aes_gmac.tfm)) {
 585                         err = PTR_ERR(key->u.aes_gmac.tfm);
 586                         kfree(key);
 587                         return ERR_PTR(err);
 588                 }
 589                 break;
 590         case WLAN_CIPHER_SUITE_GCMP:
 591         case WLAN_CIPHER_SUITE_GCMP_256:
 592                 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
 593                 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
 594                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 595                         for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
 596                                 key->u.gcmp.rx_pn[i][j] =
 597                                         seq[IEEE80211_GCMP_PN_LEN - j - 1];
 598                 /* Initialize AES key state here as an optimization so that
 599                  * it does not need to be initialized for every packet.
 600                  */
 601                 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
 602                                                                       key_len);
 603                 if (IS_ERR(key->u.gcmp.tfm)) {
 604                         err = PTR_ERR(key->u.gcmp.tfm);
 605                         kfree(key);
 606                         return ERR_PTR(err);
 607                 }
 608                 break;
 609         default:
 610                 if (cs) {
 611                         if (seq_len && seq_len != cs->pn_len) {
 612                                 kfree(key);
 613                                 return ERR_PTR(-EINVAL);
 614                         }
 615
 616                         key->conf.iv_len = cs->hdr_len;
 617                         key->conf.icv_len = cs->mic_len;
 618                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 619                                 for (j = 0; j < seq_len; j++)
 620                                         key->u.gen.rx_pn[i][j] =
 621                                                         seq[seq_len - j - 1];
 622                         key->flags |= KEY_FLAG_CIPHER_SCHEME;
 623                 }
 624         }
 625         memcpy(key->conf.key, key_data, key_len);
 626         INIT_LIST_HEAD(&key->list);
 627
 628         return key;
 629 }
 630
 631 static void ieee80211_key_free_common(struct ieee80211_key *key)
 632 {
 633         switch (key->conf.cipher) {
 634         case WLAN_CIPHER_SUITE_CCMP:
 635         case WLAN_CIPHER_SUITE_CCMP_256:
 636                 ieee80211_aes_key_free(key->u.ccmp.tfm);
 637                 break;
 638         case WLAN_CIPHER_SUITE_AES_CMAC:
 639         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 640                 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
 641                 break;
 642         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 643         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 644                 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm);
 645                 break;
 646         case WLAN_CIPHER_SUITE_GCMP:
 647         case WLAN_CIPHER_SUITE_GCMP_256:
 648                 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
 649                 break;
 650         }
 651         kzfree(key);
 652 }
 653
 654 static void __ieee80211_key_destroy(struct ieee80211_key *key,
 655                                     bool delay_tailroom)
 656 {
 657         if (key->local) {
 658                 struct ieee80211_sub_if_data *sdata = key->sdata;
 659
 660                 ieee80211_debugfs_key_remove(key);
 661
 662                 if (delay_tailroom) {
 663                         /* see ieee80211_delayed_tailroom_dec */
 664                         sdata->crypto_tx_tailroom_pending_dec++;
 665                         schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
 666                                               HZ/2);
 667                 } else {
 668                         decrease_tailroom_need_count(sdata, 1);
 669                 }
 670         }
 671
 672         ieee80211_key_free_common(key);
 673 }
 674
 675 static void ieee80211_key_destroy(struct ieee80211_key *key,
 676                                   bool delay_tailroom)
 677 {
 678         if (!key)
 679                 return;
 680
 681         /*
 682          * Synchronize so the TX path and rcu key iterators
 683          * can no longer be using this key before we free/remove it.
 684          */
 685         synchronize_net();
 686
 687         __ieee80211_key_destroy(key, delay_tailroom);
 688 }
 689
 690 void ieee80211_key_free_unused(struct ieee80211_key *key)
 691 {
 692         WARN_ON(key->sdata || key->local);
 693         ieee80211_key_free_common(key);
 694 }
 695
 696 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata,
 697                                     struct ieee80211_key *old,
 698                                     struct ieee80211_key *new)
 699 {
 700         u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP];
 701         u8 *tk_old, *tk_new;
 702
 703         if (!old || new->conf.keylen != old->conf.keylen)
 704                 return false;
 705
 706         tk_old = old->conf.key;
 707         tk_new = new->conf.key;
 708
 709         /*
 710          * In station mode, don't compare the TX MIC key, as it's never used
 711          * and offloaded rekeying may not care to send it to the host. This
 712          * is the case in iwlwifi, for example.
 713          */
 714         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 715             new->conf.cipher == WLAN_CIPHER_SUITE_TKIP &&
 716             new->conf.keylen == WLAN_KEY_LEN_TKIP &&
 717             !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
 718                 memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP);
 719                 memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP);
 720                 memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 721                 memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 722                 tk_old = tkip_old;
 723                 tk_new = tkip_new;
 724         }
 725
 726         return !crypto_memneq(tk_old, tk_new, new->conf.keylen);
 727 }
 728
 729 int ieee80211_key_link(struct ieee80211_key *key,
 730                        struct ieee80211_sub_if_data *sdata,
 731                        struct sta_info *sta)
 732 {
 733         struct ieee80211_key *old_key;
 734         int idx = key->conf.keyidx;
 735         bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
 736         /*
 737          * We want to delay tailroom updates only for station - in that
 738          * case it helps roaming speed, but in other cases it hurts and
 739          * can cause warnings to appear.
 740          */
 741         bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION;
 742         int ret;
 743
 744         mutex_lock(&sdata->local->key_mtx);
 745
 746         if (sta && pairwise)
 747                 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
 748         else if (sta)
 749                 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
 750         else
 751                 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 752
 753         /*
 754          * Silently accept key re-installation without really installing the
 755          * new version of the key to avoid nonce reuse or replay issues.
 756          */
 757         if (ieee80211_key_identical(sdata, old_key, key)) {
 758                 ieee80211_key_free_unused(key);
 759                 ret = 0;
 760                 goto out;
 761         }
 762
 763         key->local = sdata->local;
 764         key->sdata = sdata;
 765         key->sta = sta;
 766
 767         increment_tailroom_need_count(sdata);
 768
 769         ret = ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
 770
 771         if (!ret) {
 772                 ieee80211_debugfs_key_add(key);
 773                 ieee80211_key_destroy(old_key, delay_tailroom);
 774         } else {
 775                 ieee80211_key_free(key, delay_tailroom);
 776         }
 777
 778  out:
 779         mutex_unlock(&sdata->local->key_mtx);
 780
 781         return ret;
 782 }
 783
 784 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
 785 {
 786         if (!key)
 787                 return;
 788
 789         /*
 790          * Replace key with nothingness if it was ever used.
 791          */
 792         if (key->sdata)
 793                 ieee80211_key_replace(key->sdata, key->sta,
 794                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 795                                 key, NULL);
 796         ieee80211_key_destroy(key, delay_tailroom);
 797 }
 798
 799 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
 800 {
 801         struct ieee80211_key *key;
 802         struct ieee80211_sub_if_data *vlan;
 803
 804         ASSERT_RTNL();
 805
 806         if (WARN_ON(!ieee80211_sdata_running(sdata)))
 807                 return;
 808
 809         mutex_lock(&sdata->local->key_mtx);
 810
 811         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
 812                      sdata->crypto_tx_tailroom_pending_dec);
 813
 814         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 815                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 816                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
 817                                      vlan->crypto_tx_tailroom_pending_dec);
 818         }
 819
 820         list_for_each_entry(key, &sdata->key_list, list) {
 821                 increment_tailroom_need_count(sdata);
 822                 ieee80211_key_enable_hw_accel(key);
 823         }
 824
 825         mutex_unlock(&sdata->local->key_mtx);
 826 }
 827
 828 void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata)
 829 {
 830         struct ieee80211_sub_if_data *vlan;
 831
 832         mutex_lock(&sdata->local->key_mtx);
 833
 834         sdata->crypto_tx_tailroom_needed_cnt = 0;
 835
 836         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 837                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 838                         vlan->crypto_tx_tailroom_needed_cnt = 0;
 839         }
 840
 841         mutex_unlock(&sdata->local->key_mtx);
 842 }
 843
 844 void ieee80211_iter_keys(struct ieee80211_hw *hw,
 845                          struct ieee80211_vif *vif,
 846                          void (*iter)(struct ieee80211_hw *hw,
 847                                       struct ieee80211_vif *vif,
 848                                       struct ieee80211_sta *sta,
 849                                       struct ieee80211_key_conf *key,
 850                                       void *data),
 851                          void *iter_data)
 852 {
 853         struct ieee80211_local *local = hw_to_local(hw);
 854         struct ieee80211_key *key, *tmp;
 855         struct ieee80211_sub_if_data *sdata;
 856
 857         ASSERT_RTNL();
 858
 859         mutex_lock(&local->key_mtx);
 860         if (vif) {
 861                 sdata = vif_to_sdata(vif);
 862                 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
 863                         iter(hw, &sdata->vif,
 864                              key->sta ? &key->sta->sta : NULL,
 865                              &key->conf, iter_data);
 866         } else {
 867                 list_for_each_entry(sdata, &local->interfaces, list)
 868                         list_for_each_entry_safe(key, tmp,
 869                                                  &sdata->key_list, list)
 870                                 iter(hw, &sdata->vif,
 871                                      key->sta ? &key->sta->sta : NULL,
 872                                      &key->conf, iter_data);
 873         }
 874         mutex_unlock(&local->key_mtx);
 875 }
 876 EXPORT_SYMBOL(ieee80211_iter_keys);
 877
 878 static void
 879 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
 880                          struct ieee80211_sub_if_data *sdata,
 881                          void (*iter)(struct ieee80211_hw *hw,
 882                                       struct ieee80211_vif *vif,
 883                                       struct ieee80211_sta *sta,
 884                                       struct ieee80211_key_conf *key,
 885                                       void *data),
 886                          void *iter_data)
 887 {
 888         struct ieee80211_key *key;
 889
 890         list_for_each_entry_rcu(key, &sdata->key_list, list) {
 891                 /* skip keys of station in removal process */
 892                 if (key->sta && key->sta->removed)
 893                         continue;
 894                 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 895                         continue;
 896
 897                 iter(hw, &sdata->vif,
 898                      key->sta ? &key->sta->sta : NULL,
 899                      &key->conf, iter_data);
 900         }
 901 }
 902
 903 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
 904                              struct ieee80211_vif *vif,
 905                              void (*iter)(struct ieee80211_hw *hw,
 906                                           struct ieee80211_vif *vif,
 907                                           struct ieee80211_sta *sta,
 908                                           struct ieee80211_key_conf *key,
 909                                           void *data),
 910                              void *iter_data)
 911 {
 912         struct ieee80211_local *local = hw_to_local(hw);
 913         struct ieee80211_sub_if_data *sdata;
 914
 915         if (vif) {
 916                 sdata = vif_to_sdata(vif);
 917                 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
 918         } else {
 919                 list_for_each_entry_rcu(sdata, &local->interfaces, list)
 920                         _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
 921         }
 922 }
 923 EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
 924
 925 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
 926                                       struct list_head *keys)
 927 {
 928         struct ieee80211_key *key, *tmp;
 929
 930         decrease_tailroom_need_count(sdata,
 931                                      sdata->crypto_tx_tailroom_pending_dec);
 932         sdata->crypto_tx_tailroom_pending_dec = 0;
 933
 934         ieee80211_debugfs_key_remove_mgmt_default(sdata);
 935
 936         list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
 937                 ieee80211_key_replace(key->sdata, key->sta,
 938                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 939                                 key, NULL);
 940                 list_add_tail(&key->list, keys);
 941         }
 942
 943         ieee80211_debugfs_key_update_default(sdata);
 944 }
 945
 946 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
 947                          bool force_synchronize)
 948 {
 949         struct ieee80211_local *local = sdata->local;
 950         struct ieee80211_sub_if_data *vlan;
 951         struct ieee80211_sub_if_data *master;
 952         struct ieee80211_key *key, *tmp;
 953         LIST_HEAD(keys);
 954
 955         cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
 956
 957         mutex_lock(&local->key_mtx);
 958
 959         ieee80211_free_keys_iface(sdata, &keys);
 960
 961         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 962                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 963                         ieee80211_free_keys_iface(vlan, &keys);
 964         }
 965
 966         if (!list_empty(&keys) || force_synchronize)
 967                 synchronize_net();
 968         list_for_each_entry_safe(key, tmp, &keys, list)
 969                 __ieee80211_key_destroy(key, false);
 970
 971         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 972                 if (sdata->bss) {
 973                         master = container_of(sdata->bss,
 974                                               struct ieee80211_sub_if_data,
 975                                               u.ap);
 976
 977                         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
 978                                      master->crypto_tx_tailroom_needed_cnt);
 979                 }
 980         } else {
 981                 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
 982                              sdata->crypto_tx_tailroom_pending_dec);
 983         }
 984
 985         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 986                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 987                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
 988                                      vlan->crypto_tx_tailroom_pending_dec);
 989         }
 990
 991         mutex_unlock(&local->key_mtx);
 992 }
 993
 994 void ieee80211_free_sta_keys(struct ieee80211_local *local,
 995                              struct sta_info *sta)
 996 {
 997         struct ieee80211_key *key;
 998         int i;
 999
1000         mutex_lock(&local->key_mtx);
1001         for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) {
1002                 key = key_mtx_dereference(local, sta->gtk[i]);
1003                 if (!key)
1004                         continue;
1005                 ieee80211_key_replace(key->sdata, key->sta,
1006                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1007                                 key, NULL);
1008                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1009                                         NL80211_IFTYPE_STATION);
1010         }
1011
1012         for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1013                 key = key_mtx_dereference(local, sta->ptk[i]);
1014                 if (!key)
1015                         continue;
1016                 ieee80211_key_replace(key->sdata, key->sta,
1017                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1018                                 key, NULL);
1019                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1020                                         NL80211_IFTYPE_STATION);
1021         }
1022
1023         mutex_unlock(&local->key_mtx);
1024 }
1025
1026 void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
1027 {
1028         struct ieee80211_sub_if_data *sdata;
1029
1030         sdata = container_of(wk, struct ieee80211_sub_if_data,
1031                              dec_tailroom_needed_wk.work);
1032
1033         /*
1034          * The reason for the delayed tailroom needed decrementing is to
1035          * make roaming faster: during roaming, all keys are first deleted
1036          * and then new keys are installed. The first new key causes the
1037          * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
1038          * the cost of synchronize_net() (which can be slow). Avoid this
1039          * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
1040          * key removal for a while, so if we roam the value is larger than
1041          * zero and no 0->1 transition happens.
1042          *
1043          * The cost is that if the AP switching was from an AP with keys
1044          * to one without, we still allocate tailroom while it would no
1045          * longer be needed. However, in the typical (fast) roaming case
1046          * within an ESS this usually won't happen.
1047          */
1048
1049         mutex_lock(&sdata->local->key_mtx);
1050         decrease_tailroom_need_count(sdata,
1051                                      sdata->crypto_tx_tailroom_pending_dec);
1052         sdata->crypto_tx_tailroom_pending_dec = 0;
1053         mutex_unlock(&sdata->local->key_mtx);
1054 }
1055
1056 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
1057                                 const u8 *replay_ctr, gfp_t gfp)
1058 {
1059         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1060
1061         trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
1062
1063         cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
1064 }
1065 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
1066
1067 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
1068                               int tid, struct ieee80211_key_seq *seq)
1069 {
1070         struct ieee80211_key *key;
1071         const u8 *pn;
1072
1073         key = container_of(keyconf, struct ieee80211_key, conf);
1074
1075         switch (key->conf.cipher) {
1076         case WLAN_CIPHER_SUITE_TKIP:
1077                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1078                         return;
1079                 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
1080                 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
1081                 break;
1082         case WLAN_CIPHER_SUITE_CCMP:
1083         case WLAN_CIPHER_SUITE_CCMP_256:
1084                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1085                         return;
1086                 if (tid < 0)
1087                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1088                 else
1089                         pn = key->u.ccmp.rx_pn[tid];
1090                 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
1091                 break;
1092         case WLAN_CIPHER_SUITE_AES_CMAC:
1093         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1094                 if (WARN_ON(tid != 0))
1095                         return;
1096                 pn = key->u.aes_cmac.rx_pn;
1097                 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
1098                 break;
1099         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1100         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1101                 if (WARN_ON(tid != 0))
1102                         return;
1103                 pn = key->u.aes_gmac.rx_pn;
1104                 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
1105                 break;
1106         case WLAN_CIPHER_SUITE_GCMP:
1107         case WLAN_CIPHER_SUITE_GCMP_256:
1108                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1109                         return;
1110                 if (tid < 0)
1111                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1112                 else
1113                         pn = key->u.gcmp.rx_pn[tid];
1114                 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
1115                 break;
1116         }
1117 }
1118 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
1119
1120 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1121                               int tid, struct ieee80211_key_seq *seq)
1122 {
1123         struct ieee80211_key *key;
1124         u8 *pn;
1125
1126         key = container_of(keyconf, struct ieee80211_key, conf);
1127
1128         switch (key->conf.cipher) {
1129         case WLAN_CIPHER_SUITE_TKIP:
1130                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1131                         return;
1132                 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1133                 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1134                 break;
1135         case WLAN_CIPHER_SUITE_CCMP:
1136         case WLAN_CIPHER_SUITE_CCMP_256:
1137                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1138                         return;
1139                 if (tid < 0)
1140                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1141                 else
1142                         pn = key->u.ccmp.rx_pn[tid];
1143                 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1144                 break;
1145         case WLAN_CIPHER_SUITE_AES_CMAC:
1146         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1147                 if (WARN_ON(tid != 0))
1148                         return;
1149                 pn = key->u.aes_cmac.rx_pn;
1150                 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1151                 break;
1152         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1153         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1154                 if (WARN_ON(tid != 0))
1155                         return;
1156                 pn = key->u.aes_gmac.rx_pn;
1157                 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1158                 break;
1159         case WLAN_CIPHER_SUITE_GCMP:
1160         case WLAN_CIPHER_SUITE_GCMP_256:
1161                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1162                         return;
1163                 if (tid < 0)
1164                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1165                 else
1166                         pn = key->u.gcmp.rx_pn[tid];
1167                 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1168                 break;
1169         default:
1170                 WARN_ON(1);
1171                 break;
1172         }
1173 }
1174 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1175
1176 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1177 {
1178         struct ieee80211_key *key;
1179
1180         key = container_of(keyconf, struct ieee80211_key, conf);
1181
1182         assert_key_lock(key->local);
1183
1184         /*
1185          * if key was uploaded, we assume the driver will/has remove(d)
1186          * it, so adjust bookkeeping accordingly
1187          */
1188         if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1189                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1190
1191                 if (!((key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
1192                                            IEEE80211_KEY_FLAG_PUT_MIC_SPACE)) ||
1193                       (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1194                         increment_tailroom_need_count(key->sdata);
1195         }
1196
1197         ieee80211_key_free(key, false);
1198 }
1199 EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1200
1201 struct ieee80211_key_conf *
1202 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1203                         struct ieee80211_key_conf *keyconf)
1204 {
1205         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1206         struct ieee80211_local *local = sdata->local;
1207         struct ieee80211_key *key;
1208         int err;
1209
1210         if (WARN_ON(!local->wowlan))
1211                 return ERR_PTR(-EINVAL);
1212
1213         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1214                 return ERR_PTR(-EINVAL);
1215
1216         key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1217                                   keyconf->keylen, keyconf->key,
1218                                   0, NULL, NULL);
1219         if (IS_ERR(key))
1220                 return ERR_CAST(key);
1221
1222         if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1223                 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1224
1225         err = ieee80211_key_link(key, sdata, NULL);
1226         if (err)
1227                 return ERR_PTR(err);
1228
1229         return &key->conf;
1230 }
1231 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);