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 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;
 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         sdata = key->sdata;
 166         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 167                 /*
 168                  * The driver doesn't know anything about VLAN interfaces.
 169                  * Hence, don't send GTKs for VLAN interfaces to the driver.
 170                  */
 171                 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE))
 172                         goto out_unsupported;
 173         }
 174
 175         ret = drv_set_key(key->local, SET_KEY, sdata,
 176                           sta ? &sta->sta : NULL, &key->conf);
 177
 178         if (!ret) {
 179                 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
 180
 181                 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
 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                 return 0;
 189         }
 190
 191         if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1)
 192                 sdata_err(sdata,
 193                           "failed to set key (%d, %pM) to hardware (%d)\n",
 194                           key->conf.keyidx,
 195                           sta ? sta->sta.addr : bcast_addr, ret);
 196
 197  out_unsupported:
 198         switch (key->conf.cipher) {
 199         case WLAN_CIPHER_SUITE_WEP40:
 200         case WLAN_CIPHER_SUITE_WEP104:
 201         case WLAN_CIPHER_SUITE_TKIP:
 202         case WLAN_CIPHER_SUITE_CCMP:
 203         case WLAN_CIPHER_SUITE_CCMP_256:
 204         case WLAN_CIPHER_SUITE_AES_CMAC:
 205         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 206         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 207         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 208         case WLAN_CIPHER_SUITE_GCMP:
 209         case WLAN_CIPHER_SUITE_GCMP_256:
 210                 /* all of these we can do in software - if driver can */
 211                 if (ret == 1)
 212                         return 0;
 213                 if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL))
 214                         return -EINVAL;
 215                 return 0;
 216         default:
 217                 return -EINVAL;
 218         }
 219 }
 220
 221 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
 222 {
 223         struct ieee80211_sub_if_data *sdata;
 224         struct sta_info *sta;
 225         int ret;
 226
 227         might_sleep();
 228
 229         if (!key || !key->local->ops->set_key)
 230                 return;
 231
 232         assert_key_lock(key->local);
 233
 234         if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 235                 return;
 236
 237         sta = key->sta;
 238         sdata = key->sdata;
 239
 240         if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
 241               (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 242                 increment_tailroom_need_count(sdata);
 243
 244         ret = drv_set_key(key->local, DISABLE_KEY, sdata,
 245                           sta ? &sta->sta : NULL, &key->conf);
 246
 247         if (ret)
 248                 sdata_err(sdata,
 249                           "failed to remove key (%d, %pM) from hardware (%d)\n",
 250                           key->conf.keyidx,
 251                           sta ? sta->sta.addr : bcast_addr, ret);
 252
 253         key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 254 }
 255
 256 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
 257                                         int idx, bool uni, bool multi)
 258 {
 259         struct ieee80211_key *key = NULL;
 260
 261         assert_key_lock(sdata->local);
 262
 263         if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
 264                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 265
 266         if (uni) {
 267                 rcu_assign_pointer(sdata->default_unicast_key, key);
 268                 ieee80211_check_fast_xmit_iface(sdata);
 269                 drv_set_default_unicast_key(sdata->local, sdata, idx);
 270         }
 271
 272         if (multi)
 273                 rcu_assign_pointer(sdata->default_multicast_key, key);
 274
 275         ieee80211_debugfs_key_update_default(sdata);
 276 }
 277
 278 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
 279                                bool uni, bool multi)
 280 {
 281         mutex_lock(&sdata->local->key_mtx);
 282         __ieee80211_set_default_key(sdata, idx, uni, multi);
 283         mutex_unlock(&sdata->local->key_mtx);
 284 }
 285
 286 static void
 287 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
 288 {
 289         struct ieee80211_key *key = NULL;
 290
 291         assert_key_lock(sdata->local);
 292
 293         if (idx >= NUM_DEFAULT_KEYS &&
 294             idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
 295                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 296
 297         rcu_assign_pointer(sdata->default_mgmt_key, key);
 298
 299         ieee80211_debugfs_key_update_default(sdata);
 300 }
 301
 302 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
 303                                     int idx)
 304 {
 305         mutex_lock(&sdata->local->key_mtx);
 306         __ieee80211_set_default_mgmt_key(sdata, idx);
 307         mutex_unlock(&sdata->local->key_mtx);
 308 }
 309
 310
 311 static void ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
 312                                   struct sta_info *sta,
 313                                   bool pairwise,
 314                                   struct ieee80211_key *old,
 315                                   struct ieee80211_key *new)
 316 {
 317         int idx;
 318         bool defunikey, defmultikey, defmgmtkey;
 319
 320         /* caller must provide at least one old/new */
 321         if (WARN_ON(!new && !old))
 322                 return;
 323
 324         if (new)
 325                 list_add_tail(&new->list, &sdata->key_list);
 326
 327         WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
 328
 329         if (old)
 330                 idx = old->conf.keyidx;
 331         else
 332                 idx = new->conf.keyidx;
 333
 334         if (sta) {
 335                 if (pairwise) {
 336                         rcu_assign_pointer(sta->ptk[idx], new);
 337                         sta->ptk_idx = idx;
 338                         ieee80211_check_fast_xmit(sta);
 339                 } else {
 340                         rcu_assign_pointer(sta->gtk[idx], new);
 341                 }
 342         } else {
 343                 defunikey = old &&
 344                         old == key_mtx_dereference(sdata->local,
 345                                                 sdata->default_unicast_key);
 346                 defmultikey = old &&
 347                         old == key_mtx_dereference(sdata->local,
 348                                                 sdata->default_multicast_key);
 349                 defmgmtkey = old &&
 350                         old == key_mtx_dereference(sdata->local,
 351                                                 sdata->default_mgmt_key);
 352
 353                 if (defunikey && !new)
 354                         __ieee80211_set_default_key(sdata, -1, true, false);
 355                 if (defmultikey && !new)
 356                         __ieee80211_set_default_key(sdata, -1, false, true);
 357                 if (defmgmtkey && !new)
 358                         __ieee80211_set_default_mgmt_key(sdata, -1);
 359
 360                 rcu_assign_pointer(sdata->keys[idx], new);
 361                 if (defunikey && new)
 362                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 363                                                     true, false);
 364                 if (defmultikey && new)
 365                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 366                                                     false, true);
 367                 if (defmgmtkey && new)
 368                         __ieee80211_set_default_mgmt_key(sdata,
 369                                                          new->conf.keyidx);
 370         }
 371
 372         if (old)
 373                 list_del(&old->list);
 374 }
 375
 376 struct ieee80211_key *
 377 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
 378                     const u8 *key_data,
 379                     size_t seq_len, const u8 *seq,
 380                     const struct ieee80211_cipher_scheme *cs)
 381 {
 382         struct ieee80211_key *key;
 383         int i, j, err;
 384
 385         if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS))
 386                 return ERR_PTR(-EINVAL);
 387
 388         key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
 389         if (!key)
 390                 return ERR_PTR(-ENOMEM);
 391
 392         /*
 393          * Default to software encryption; we'll later upload the
 394          * key to the hardware if possible.
 395          */
 396         key->conf.flags = 0;
 397         key->flags = 0;
 398
 399         key->conf.cipher = cipher;
 400         key->conf.keyidx = idx;
 401         key->conf.keylen = key_len;
 402         switch (cipher) {
 403         case WLAN_CIPHER_SUITE_WEP40:
 404         case WLAN_CIPHER_SUITE_WEP104:
 405                 key->conf.iv_len = IEEE80211_WEP_IV_LEN;
 406                 key->conf.icv_len = IEEE80211_WEP_ICV_LEN;
 407                 break;
 408         case WLAN_CIPHER_SUITE_TKIP:
 409                 key->conf.iv_len = IEEE80211_TKIP_IV_LEN;
 410                 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN;
 411                 if (seq) {
 412                         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
 413                                 key->u.tkip.rx[i].iv32 =
 414                                         get_unaligned_le32(&seq[2]);
 415                                 key->u.tkip.rx[i].iv16 =
 416                                         get_unaligned_le16(seq);
 417                         }
 418                 }
 419                 spin_lock_init(&key->u.tkip.txlock);
 420                 break;
 421         case WLAN_CIPHER_SUITE_CCMP:
 422                 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN;
 423                 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN;
 424                 if (seq) {
 425                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 426                                 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++)
 427                                         key->u.ccmp.rx_pn[i][j] =
 428                                                 seq[IEEE80211_CCMP_PN_LEN - j - 1];
 429                 }
 430                 /*
 431                  * Initialize AES key state here as an optimization so that
 432                  * it does not need to be initialized for every packet.
 433                  */
 434                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 435                         key_data, key_len, IEEE80211_CCMP_MIC_LEN);
 436                 if (IS_ERR(key->u.ccmp.tfm)) {
 437                         err = PTR_ERR(key->u.ccmp.tfm);
 438                         kfree(key);
 439                         return ERR_PTR(err);
 440                 }
 441                 break;
 442         case WLAN_CIPHER_SUITE_CCMP_256:
 443                 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN;
 444                 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN;
 445                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 446                         for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++)
 447                                 key->u.ccmp.rx_pn[i][j] =
 448                                         seq[IEEE80211_CCMP_256_PN_LEN - j - 1];
 449                 /* Initialize AES key state here as an optimization so that
 450                  * it does not need to be initialized for every packet.
 451                  */
 452                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 453                         key_data, key_len, IEEE80211_CCMP_256_MIC_LEN);
 454                 if (IS_ERR(key->u.ccmp.tfm)) {
 455                         err = PTR_ERR(key->u.ccmp.tfm);
 456                         kfree(key);
 457                         return ERR_PTR(err);
 458                 }
 459                 break;
 460         case WLAN_CIPHER_SUITE_AES_CMAC:
 461         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 462                 key->conf.iv_len = 0;
 463                 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
 464                         key->conf.icv_len = sizeof(struct ieee80211_mmie);
 465                 else
 466                         key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 467                 if (seq)
 468                         for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
 469                                 key->u.aes_cmac.rx_pn[j] =
 470                                         seq[IEEE80211_CMAC_PN_LEN - j - 1];
 471                 /*
 472                  * Initialize AES key state here as an optimization so that
 473                  * it does not need to be initialized for every packet.
 474                  */
 475                 key->u.aes_cmac.tfm =
 476                         ieee80211_aes_cmac_key_setup(key_data, key_len);
 477                 if (IS_ERR(key->u.aes_cmac.tfm)) {
 478                         err = PTR_ERR(key->u.aes_cmac.tfm);
 479                         kfree(key);
 480                         return ERR_PTR(err);
 481                 }
 482                 break;
 483         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 484         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 485                 key->conf.iv_len = 0;
 486                 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 487                 if (seq)
 488                         for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++)
 489                                 key->u.aes_gmac.rx_pn[j] =
 490                                         seq[IEEE80211_GMAC_PN_LEN - j - 1];
 491                 /* Initialize AES key state here as an optimization so that
 492                  * it does not need to be initialized for every packet.
 493                  */
 494                 key->u.aes_gmac.tfm =
 495                         ieee80211_aes_gmac_key_setup(key_data, key_len);
 496                 if (IS_ERR(key->u.aes_gmac.tfm)) {
 497                         err = PTR_ERR(key->u.aes_gmac.tfm);
 498                         kfree(key);
 499                         return ERR_PTR(err);
 500                 }
 501                 break;
 502         case WLAN_CIPHER_SUITE_GCMP:
 503         case WLAN_CIPHER_SUITE_GCMP_256:
 504                 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
 505                 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
 506                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 507                         for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
 508                                 key->u.gcmp.rx_pn[i][j] =
 509                                         seq[IEEE80211_GCMP_PN_LEN - j - 1];
 510                 /* Initialize AES key state here as an optimization so that
 511                  * it does not need to be initialized for every packet.
 512                  */
 513                 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
 514                                                                       key_len);
 515                 if (IS_ERR(key->u.gcmp.tfm)) {
 516                         err = PTR_ERR(key->u.gcmp.tfm);
 517                         kfree(key);
 518                         return ERR_PTR(err);
 519                 }
 520                 break;
 521         default:
 522                 if (cs) {
 523                         if (seq_len && seq_len != cs->pn_len) {
 524                                 kfree(key);
 525                                 return ERR_PTR(-EINVAL);
 526                         }
 527
 528                         key->conf.iv_len = cs->hdr_len;
 529                         key->conf.icv_len = cs->mic_len;
 530                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 531                                 for (j = 0; j < seq_len; j++)
 532                                         key->u.gen.rx_pn[i][j] =
 533                                                         seq[seq_len - j - 1];
 534                         key->flags |= KEY_FLAG_CIPHER_SCHEME;
 535                 }
 536         }
 537         memcpy(key->conf.key, key_data, key_len);
 538         INIT_LIST_HEAD(&key->list);
 539
 540         return key;
 541 }
 542
 543 static void ieee80211_key_free_common(struct ieee80211_key *key)
 544 {
 545         switch (key->conf.cipher) {
 546         case WLAN_CIPHER_SUITE_CCMP:
 547         case WLAN_CIPHER_SUITE_CCMP_256:
 548                 ieee80211_aes_key_free(key->u.ccmp.tfm);
 549                 break;
 550         case WLAN_CIPHER_SUITE_AES_CMAC:
 551         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 552                 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
 553                 break;
 554         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 555         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 556                 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm);
 557                 break;
 558         case WLAN_CIPHER_SUITE_GCMP:
 559         case WLAN_CIPHER_SUITE_GCMP_256:
 560                 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
 561                 break;
 562         }
 563         kzfree(key);
 564 }
 565
 566 static void __ieee80211_key_destroy(struct ieee80211_key *key,
 567                                     bool delay_tailroom)
 568 {
 569         if (key->local)
 570                 ieee80211_key_disable_hw_accel(key);
 571
 572         if (key->local) {
 573                 struct ieee80211_sub_if_data *sdata = key->sdata;
 574
 575                 ieee80211_debugfs_key_remove(key);
 576
 577                 if (delay_tailroom) {
 578                         /* see ieee80211_delayed_tailroom_dec */
 579                         sdata->crypto_tx_tailroom_pending_dec++;
 580                         schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
 581                                               HZ/2);
 582                 } else {
 583                         decrease_tailroom_need_count(sdata, 1);
 584                 }
 585         }
 586
 587         ieee80211_key_free_common(key);
 588 }
 589
 590 static void ieee80211_key_destroy(struct ieee80211_key *key,
 591                                   bool delay_tailroom)
 592 {
 593         if (!key)
 594                 return;
 595
 596         /*
 597          * Synchronize so the TX path can no longer be using
 598          * this key before we free/remove it.
 599          */
 600         synchronize_net();
 601
 602         __ieee80211_key_destroy(key, delay_tailroom);
 603 }
 604
 605 void ieee80211_key_free_unused(struct ieee80211_key *key)
 606 {
 607         WARN_ON(key->sdata || key->local);
 608         ieee80211_key_free_common(key);
 609 }
 610
 611 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata,
 612                                     struct ieee80211_key *old,
 613                                     struct ieee80211_key *new)
 614 {
 615         u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP];
 616         u8 *tk_old, *tk_new;
 617
 618         if (!old || new->conf.keylen != old->conf.keylen)
 619                 return false;
 620
 621         tk_old = old->conf.key;
 622         tk_new = new->conf.key;
 623
 624         /*
 625          * In station mode, don't compare the TX MIC key, as it's never used
 626          * and offloaded rekeying may not care to send it to the host. This
 627          * is the case in iwlwifi, for example.
 628          */
 629         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 630             new->conf.cipher == WLAN_CIPHER_SUITE_TKIP &&
 631             new->conf.keylen == WLAN_KEY_LEN_TKIP &&
 632             !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
 633                 memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP);
 634                 memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP);
 635                 memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 636                 memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 637                 tk_old = tkip_old;
 638                 tk_new = tkip_new;
 639         }
 640
 641         return !crypto_memneq(tk_old, tk_new, new->conf.keylen);
 642 }
 643
 644 int ieee80211_key_link(struct ieee80211_key *key,
 645                        struct ieee80211_sub_if_data *sdata,
 646                        struct sta_info *sta)
 647 {
 648         struct ieee80211_local *local = sdata->local;
 649         struct ieee80211_key *old_key;
 650         int idx = key->conf.keyidx;
 651         bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
 652         /*
 653          * We want to delay tailroom updates only for station - in that
 654          * case it helps roaming speed, but in other cases it hurts and
 655          * can cause warnings to appear.
 656          */
 657         bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION;
 658         int ret;
 659
 660         mutex_lock(&sdata->local->key_mtx);
 661
 662         if (sta && pairwise)
 663                 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
 664         else if (sta)
 665                 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
 666         else
 667                 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 668
 669         /*
 670          * Silently accept key re-installation without really installing the
 671          * new version of the key to avoid nonce reuse or replay issues.
 672          */
 673         if (ieee80211_key_identical(sdata, old_key, key)) {
 674                 ieee80211_key_free_unused(key);
 675                 ret = 0;
 676                 goto out;
 677         }
 678
 679         key->local = sdata->local;
 680         key->sdata = sdata;
 681         key->sta = sta;
 682
 683         increment_tailroom_need_count(sdata);
 684
 685         ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
 686         ieee80211_key_destroy(old_key, delay_tailroom);
 687
 688         ieee80211_debugfs_key_add(key);
 689
 690         if (!local->wowlan) {
 691                 ret = ieee80211_key_enable_hw_accel(key);
 692                 if (ret)
 693                         ieee80211_key_free(key, delay_tailroom);
 694         } else {
 695                 ret = 0;
 696         }
 697
 698  out:
 699         mutex_unlock(&sdata->local->key_mtx);
 700
 701         return ret;
 702 }
 703
 704 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
 705 {
 706         if (!key)
 707                 return;
 708
 709         /*
 710          * Replace key with nothingness if it was ever used.
 711          */
 712         if (key->sdata)
 713                 ieee80211_key_replace(key->sdata, key->sta,
 714                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 715                                 key, NULL);
 716         ieee80211_key_destroy(key, delay_tailroom);
 717 }
 718
 719 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
 720 {
 721         struct ieee80211_key *key;
 722         struct ieee80211_sub_if_data *vlan;
 723
 724         ASSERT_RTNL();
 725
 726         if (WARN_ON(!ieee80211_sdata_running(sdata)))
 727                 return;
 728
 729         mutex_lock(&sdata->local->key_mtx);
 730
 731         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
 732                      sdata->crypto_tx_tailroom_pending_dec);
 733
 734         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 735                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 736                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
 737                                      vlan->crypto_tx_tailroom_pending_dec);
 738         }
 739
 740         list_for_each_entry(key, &sdata->key_list, list) {
 741                 increment_tailroom_need_count(sdata);
 742                 ieee80211_key_enable_hw_accel(key);
 743         }
 744
 745         mutex_unlock(&sdata->local->key_mtx);
 746 }
 747
 748 void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata)
 749 {
 750         struct ieee80211_sub_if_data *vlan;
 751
 752         mutex_lock(&sdata->local->key_mtx);
 753
 754         sdata->crypto_tx_tailroom_needed_cnt = 0;
 755
 756         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 757                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 758                         vlan->crypto_tx_tailroom_needed_cnt = 0;
 759         }
 760
 761         mutex_unlock(&sdata->local->key_mtx);
 762 }
 763
 764 void ieee80211_iter_keys(struct ieee80211_hw *hw,
 765                          struct ieee80211_vif *vif,
 766                          void (*iter)(struct ieee80211_hw *hw,
 767                                       struct ieee80211_vif *vif,
 768                                       struct ieee80211_sta *sta,
 769                                       struct ieee80211_key_conf *key,
 770                                       void *data),
 771                          void *iter_data)
 772 {
 773         struct ieee80211_local *local = hw_to_local(hw);
 774         struct ieee80211_key *key, *tmp;
 775         struct ieee80211_sub_if_data *sdata;
 776
 777         ASSERT_RTNL();
 778
 779         mutex_lock(&local->key_mtx);
 780         if (vif) {
 781                 sdata = vif_to_sdata(vif);
 782                 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
 783                         iter(hw, &sdata->vif,
 784                              key->sta ? &key->sta->sta : NULL,
 785                              &key->conf, iter_data);
 786         } else {
 787                 list_for_each_entry(sdata, &local->interfaces, list)
 788                         list_for_each_entry_safe(key, tmp,
 789                                                  &sdata->key_list, list)
 790                                 iter(hw, &sdata->vif,
 791                                      key->sta ? &key->sta->sta : NULL,
 792                                      &key->conf, iter_data);
 793         }
 794         mutex_unlock(&local->key_mtx);
 795 }
 796 EXPORT_SYMBOL(ieee80211_iter_keys);
 797
 798 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
 799                                       struct list_head *keys)
 800 {
 801         struct ieee80211_key *key, *tmp;
 802
 803         decrease_tailroom_need_count(sdata,
 804                                      sdata->crypto_tx_tailroom_pending_dec);
 805         sdata->crypto_tx_tailroom_pending_dec = 0;
 806
 807         ieee80211_debugfs_key_remove_mgmt_default(sdata);
 808
 809         list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
 810                 ieee80211_key_replace(key->sdata, key->sta,
 811                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 812                                 key, NULL);
 813                 list_add_tail(&key->list, keys);
 814         }
 815
 816         ieee80211_debugfs_key_update_default(sdata);
 817 }
 818
 819 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
 820                          bool force_synchronize)
 821 {
 822         struct ieee80211_local *local = sdata->local;
 823         struct ieee80211_sub_if_data *vlan;
 824         struct ieee80211_sub_if_data *master;
 825         struct ieee80211_key *key, *tmp;
 826         LIST_HEAD(keys);
 827
 828         cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
 829
 830         mutex_lock(&local->key_mtx);
 831
 832         ieee80211_free_keys_iface(sdata, &keys);
 833
 834         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 835                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 836                         ieee80211_free_keys_iface(vlan, &keys);
 837         }
 838
 839         if (!list_empty(&keys) || force_synchronize)
 840                 synchronize_net();
 841         list_for_each_entry_safe(key, tmp, &keys, list)
 842                 __ieee80211_key_destroy(key, false);
 843
 844         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 845                 if (sdata->bss) {
 846                         master = container_of(sdata->bss,
 847                                               struct ieee80211_sub_if_data,
 848                                               u.ap);
 849
 850                         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
 851                                      master->crypto_tx_tailroom_needed_cnt);
 852                 }
 853         } else {
 854                 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
 855                              sdata->crypto_tx_tailroom_pending_dec);
 856         }
 857
 858         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 859                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 860                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
 861                                      vlan->crypto_tx_tailroom_pending_dec);
 862         }
 863
 864         mutex_unlock(&local->key_mtx);
 865 }
 866
 867 void ieee80211_free_sta_keys(struct ieee80211_local *local,
 868                              struct sta_info *sta)
 869 {
 870         struct ieee80211_key *key;
 871         int i;
 872
 873         mutex_lock(&local->key_mtx);
 874         for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) {
 875                 key = key_mtx_dereference(local, sta->gtk[i]);
 876                 if (!key)
 877                         continue;
 878                 ieee80211_key_replace(key->sdata, key->sta,
 879                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 880                                 key, NULL);
 881                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
 882                                         NL80211_IFTYPE_STATION);
 883         }
 884
 885         for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
 886                 key = key_mtx_dereference(local, sta->ptk[i]);
 887                 if (!key)
 888                         continue;
 889                 ieee80211_key_replace(key->sdata, key->sta,
 890                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 891                                 key, NULL);
 892                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
 893                                         NL80211_IFTYPE_STATION);
 894         }
 895
 896         mutex_unlock(&local->key_mtx);
 897 }
 898
 899 void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
 900 {
 901         struct ieee80211_sub_if_data *sdata;
 902
 903         sdata = container_of(wk, struct ieee80211_sub_if_data,
 904                              dec_tailroom_needed_wk.work);
 905
 906         /*
 907          * The reason for the delayed tailroom needed decrementing is to
 908          * make roaming faster: during roaming, all keys are first deleted
 909          * and then new keys are installed. The first new key causes the
 910          * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
 911          * the cost of synchronize_net() (which can be slow). Avoid this
 912          * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
 913          * key removal for a while, so if we roam the value is larger than
 914          * zero and no 0->1 transition happens.
 915          *
 916          * The cost is that if the AP switching was from an AP with keys
 917          * to one without, we still allocate tailroom while it would no
 918          * longer be needed. However, in the typical (fast) roaming case
 919          * within an ESS this usually won't happen.
 920          */
 921
 922         mutex_lock(&sdata->local->key_mtx);
 923         decrease_tailroom_need_count(sdata,
 924                                      sdata->crypto_tx_tailroom_pending_dec);
 925         sdata->crypto_tx_tailroom_pending_dec = 0;
 926         mutex_unlock(&sdata->local->key_mtx);
 927 }
 928
 929 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
 930                                 const u8 *replay_ctr, gfp_t gfp)
 931 {
 932         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 933
 934         trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
 935
 936         cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
 937 }
 938 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
 939
 940 void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf,
 941                               struct ieee80211_key_seq *seq)
 942 {
 943         struct ieee80211_key *key;
 944         u64 pn64;
 945
 946         if (WARN_ON(!(keyconf->flags & IEEE80211_KEY_FLAG_GENERATE_IV)))
 947                 return;
 948
 949         key = container_of(keyconf, struct ieee80211_key, conf);
 950
 951         switch (key->conf.cipher) {
 952         case WLAN_CIPHER_SUITE_TKIP:
 953                 seq->tkip.iv32 = key->u.tkip.tx.iv32;
 954                 seq->tkip.iv16 = key->u.tkip.tx.iv16;
 955                 break;
 956         case WLAN_CIPHER_SUITE_CCMP:
 957         case WLAN_CIPHER_SUITE_CCMP_256:
 958         case WLAN_CIPHER_SUITE_AES_CMAC:
 959         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 960                 BUILD_BUG_ON(offsetof(typeof(*seq), ccmp) !=
 961                              offsetof(typeof(*seq), aes_cmac));
 962         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 963         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 964                 BUILD_BUG_ON(offsetof(typeof(*seq), ccmp) !=
 965                              offsetof(typeof(*seq), aes_gmac));
 966         case WLAN_CIPHER_SUITE_GCMP:
 967         case WLAN_CIPHER_SUITE_GCMP_256:
 968                 BUILD_BUG_ON(offsetof(typeof(*seq), ccmp) !=
 969                              offsetof(typeof(*seq), gcmp));
 970                 pn64 = atomic64_read(&key->conf.tx_pn);
 971                 seq->ccmp.pn[5] = pn64;
 972                 seq->ccmp.pn[4] = pn64 >> 8;
 973                 seq->ccmp.pn[3] = pn64 >> 16;
 974                 seq->ccmp.pn[2] = pn64 >> 24;
 975                 seq->ccmp.pn[1] = pn64 >> 32;
 976                 seq->ccmp.pn[0] = pn64 >> 40;
 977                 break;
 978         default:
 979                 WARN_ON(1);
 980         }
 981 }
 982 EXPORT_SYMBOL(ieee80211_get_key_tx_seq);
 983
 984 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
 985                               int tid, struct ieee80211_key_seq *seq)
 986 {
 987         struct ieee80211_key *key;
 988         const u8 *pn;
 989
 990         key = container_of(keyconf, struct ieee80211_key, conf);
 991
 992         switch (key->conf.cipher) {
 993         case WLAN_CIPHER_SUITE_TKIP:
 994                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
 995                         return;
 996                 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
 997                 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
 998                 break;
 999         case WLAN_CIPHER_SUITE_CCMP:
1000         case WLAN_CIPHER_SUITE_CCMP_256:
1001                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1002                         return;
1003                 if (tid < 0)
1004                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1005                 else
1006                         pn = key->u.ccmp.rx_pn[tid];
1007                 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
1008                 break;
1009         case WLAN_CIPHER_SUITE_AES_CMAC:
1010         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1011                 if (WARN_ON(tid != 0))
1012                         return;
1013                 pn = key->u.aes_cmac.rx_pn;
1014                 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
1015                 break;
1016         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1017         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1018                 if (WARN_ON(tid != 0))
1019                         return;
1020                 pn = key->u.aes_gmac.rx_pn;
1021                 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
1022                 break;
1023         case WLAN_CIPHER_SUITE_GCMP:
1024         case WLAN_CIPHER_SUITE_GCMP_256:
1025                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1026                         return;
1027                 if (tid < 0)
1028                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1029                 else
1030                         pn = key->u.gcmp.rx_pn[tid];
1031                 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
1032                 break;
1033         }
1034 }
1035 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
1036
1037 void ieee80211_set_key_tx_seq(struct ieee80211_key_conf *keyconf,
1038                               struct ieee80211_key_seq *seq)
1039 {
1040         struct ieee80211_key *key;
1041         u64 pn64;
1042
1043         key = container_of(keyconf, struct ieee80211_key, conf);
1044
1045         switch (key->conf.cipher) {
1046         case WLAN_CIPHER_SUITE_TKIP:
1047                 key->u.tkip.tx.iv32 = seq->tkip.iv32;
1048                 key->u.tkip.tx.iv16 = seq->tkip.iv16;
1049                 break;
1050         case WLAN_CIPHER_SUITE_CCMP:
1051         case WLAN_CIPHER_SUITE_CCMP_256:
1052         case WLAN_CIPHER_SUITE_AES_CMAC:
1053         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1054                 BUILD_BUG_ON(offsetof(typeof(*seq), ccmp) !=
1055                              offsetof(typeof(*seq), aes_cmac));
1056         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1057         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1058                 BUILD_BUG_ON(offsetof(typeof(*seq), ccmp) !=
1059                              offsetof(typeof(*seq), aes_gmac));
1060         case WLAN_CIPHER_SUITE_GCMP:
1061         case WLAN_CIPHER_SUITE_GCMP_256:
1062                 BUILD_BUG_ON(offsetof(typeof(*seq), ccmp) !=
1063                              offsetof(typeof(*seq), gcmp));
1064                 pn64 = (u64)seq->ccmp.pn[5] |
1065                        ((u64)seq->ccmp.pn[4] << 8) |
1066                        ((u64)seq->ccmp.pn[3] << 16) |
1067                        ((u64)seq->ccmp.pn[2] << 24) |
1068                        ((u64)seq->ccmp.pn[1] << 32) |
1069                        ((u64)seq->ccmp.pn[0] << 40);
1070                 atomic64_set(&key->conf.tx_pn, pn64);
1071                 break;
1072         default:
1073                 WARN_ON(1);
1074                 break;
1075         }
1076 }
1077 EXPORT_SYMBOL_GPL(ieee80211_set_key_tx_seq);
1078
1079 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1080                               int tid, struct ieee80211_key_seq *seq)
1081 {
1082         struct ieee80211_key *key;
1083         u8 *pn;
1084
1085         key = container_of(keyconf, struct ieee80211_key, conf);
1086
1087         switch (key->conf.cipher) {
1088         case WLAN_CIPHER_SUITE_TKIP:
1089                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1090                         return;
1091                 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1092                 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1093                 break;
1094         case WLAN_CIPHER_SUITE_CCMP:
1095         case WLAN_CIPHER_SUITE_CCMP_256:
1096                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1097                         return;
1098                 if (tid < 0)
1099                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1100                 else
1101                         pn = key->u.ccmp.rx_pn[tid];
1102                 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1103                 break;
1104         case WLAN_CIPHER_SUITE_AES_CMAC:
1105         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1106                 if (WARN_ON(tid != 0))
1107                         return;
1108                 pn = key->u.aes_cmac.rx_pn;
1109                 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1110                 break;
1111         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1112         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1113                 if (WARN_ON(tid != 0))
1114                         return;
1115                 pn = key->u.aes_gmac.rx_pn;
1116                 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1117                 break;
1118         case WLAN_CIPHER_SUITE_GCMP:
1119         case WLAN_CIPHER_SUITE_GCMP_256:
1120                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1121                         return;
1122                 if (tid < 0)
1123                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1124                 else
1125                         pn = key->u.gcmp.rx_pn[tid];
1126                 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1127                 break;
1128         default:
1129                 WARN_ON(1);
1130                 break;
1131         }
1132 }
1133 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1134
1135 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1136 {
1137         struct ieee80211_key *key;
1138
1139         key = container_of(keyconf, struct ieee80211_key, conf);
1140
1141         assert_key_lock(key->local);
1142
1143         /*
1144          * if key was uploaded, we assume the driver will/has remove(d)
1145          * it, so adjust bookkeeping accordingly
1146          */
1147         if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1148                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1149
1150                 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
1151                       (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1152                         increment_tailroom_need_count(key->sdata);
1153         }
1154
1155         ieee80211_key_free(key, false);
1156 }
1157 EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1158
1159 struct ieee80211_key_conf *
1160 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1161                         struct ieee80211_key_conf *keyconf)
1162 {
1163         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1164         struct ieee80211_local *local = sdata->local;
1165         struct ieee80211_key *key;
1166         int err;
1167
1168         if (WARN_ON(!local->wowlan))
1169                 return ERR_PTR(-EINVAL);
1170
1171         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1172                 return ERR_PTR(-EINVAL);
1173
1174         key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1175                                   keyconf->keylen, keyconf->key,
1176                                   0, NULL, NULL);
1177         if (IS_ERR(key))
1178                 return ERR_CAST(key);
1179
1180         if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1181                 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1182
1183         err = ieee80211_key_link(key, sdata, NULL);
1184         if (err)
1185                 return ERR_PTR(err);
1186
1187         return &key->conf;
1188 }
1189 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);