kernel/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  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/if_ether.h>
  14 #include <linux/etherdevice.h>
  15 #include <linux/list.h>
  16 #include <linux/rcupdate.h>
  17 #include <linux/rtnetlink.h>
  18 #include <linux/slab.h>
  19 #include <linux/export.h>
  20 #include <net/mac80211.h>
  21 #include <asm/unaligned.h>
  22 #include "ieee80211_i.h"
  23 #include "driver-ops.h"
  24 #include "debugfs_key.h"
  25 #include "aes_ccm.h"
  26 #include "aes_cmac.h"
  27 #include "aes_gmac.h"
  28 #include "aes_gcm.h"
  29
  30
  31 /**
  32  * DOC: Key handling basics
  33  *
  34  * Key handling in mac80211 is done based on per-interface (sub_if_data)
  35  * keys and per-station keys. Since each station belongs to an interface,
  36  * each station key also belongs to that interface.
  37  *
  38  * Hardware acceleration is done on a best-effort basis for algorithms
  39  * that are implemented in software,  for each key the hardware is asked
  40  * to enable that key for offloading but if it cannot do that the key is
  41  * simply kept for software encryption (unless it is for an algorithm
  42  * that isn't implemented in software).
  43  * There is currently no way of knowing whether a key is handled in SW
  44  * or HW except by looking into debugfs.
  45  *
  46  * All key management is internally protected by a mutex. Within all
  47  * other parts of mac80211, key references are, just as STA structure
  48  * references, protected by RCU. Note, however, that some things are
  49  * unprotected, namely the key->sta dereferences within the hardware
  50  * acceleration functions. This means that sta_info_destroy() must
  51  * remove the key which waits for an RCU grace period.
  52  */
  53
  54 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
  55
  56 static void assert_key_lock(struct ieee80211_local *local)
  57 {
  58         lockdep_assert_held(&local->key_mtx);
  59 }
  60
  61 static void
  62 update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta)
  63 {
  64         struct ieee80211_sub_if_data *vlan;
  65
  66         if (sdata->vif.type != NL80211_IFTYPE_AP)
  67                 return;
  68
  69         /* crypto_tx_tailroom_needed_cnt is protected by this */
  70         assert_key_lock(sdata->local);
  71
  72         rcu_read_lock();
  73
  74         list_for_each_entry_rcu(vlan, &sdata->u.ap.vlans, u.vlan.list)
  75                 vlan->crypto_tx_tailroom_needed_cnt += delta;
  76
  77         rcu_read_unlock();
  78 }
  79
  80 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
  81 {
  82         /*
  83          * When this count is zero, SKB resizing for allocating tailroom
  84          * for IV or MMIC is skipped. But, this check has created two race
  85          * cases in xmit path while transiting from zero count to one:
  86          *
  87          * 1. SKB resize was skipped because no key was added but just before
  88          * the xmit key is added and SW encryption kicks off.
  89          *
  90          * 2. SKB resize was skipped because all the keys were hw planted but
  91          * just before xmit one of the key is deleted and SW encryption kicks
  92          * off.
  93          *
  94          * In both the above case SW encryption will find not enough space for
  95          * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
  96          *
  97          * Solution has been explained at
  98          * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
  99          */
 100
 101         assert_key_lock(sdata->local);
 102
 103         update_vlan_tailroom_need_count(sdata, 1);
 104
 105         if (!sdata->crypto_tx_tailroom_needed_cnt++) {
 106                 /*
 107                  * Flush all XMIT packets currently using HW encryption or no
 108                  * encryption at all if the count transition is from 0 -> 1.
 109                  */
 110                 synchronize_net();
 111         }
 112 }
 113
 114 static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata,
 115                                          int delta)
 116 {
 117         assert_key_lock(sdata->local);
 118
 119         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta);
 120
 121         update_vlan_tailroom_need_count(sdata, -delta);
 122         sdata->crypto_tx_tailroom_needed_cnt -= delta;
 123 }
 124
 125 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
 126 {
 127         struct ieee80211_sub_if_data *sdata;
 128         struct sta_info *sta;
 129         int ret = -EOPNOTSUPP;
 130
 131         might_sleep();
 132
 133         if (key->flags & KEY_FLAG_TAINTED) {
 134                 /* If we get here, it's during resume and the key is
 135                  * tainted so shouldn't be used/programmed any more.
 136                  * However, its flags may still indicate that it was
 137                  * programmed into the device (since we're in resume)
 138                  * so clear that flag now to avoid trying to remove
 139                  * it again later.
 140                  */
 141                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 142                 return -EINVAL;
 143         }
 144
 145         if (!key->local->ops->set_key)
 146                 goto out_unsupported;
 147
 148         assert_key_lock(key->local);
 149
 150         sta = key->sta;
 151
 152         /*
 153          * If this is a per-STA GTK, check if it
 154          * is supported; if not, return.
 155          */
 156         if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) &&
 157             !(key->local->hw.flags & IEEE80211_HW_SUPPORTS_PER_STA_GTK))
 158                 goto out_unsupported;
 159
 160         if (sta && !sta->uploaded)
 161                 goto out_unsupported;
 162
 163         sdata = key->sdata;
 164         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 165                 /*
 166                  * The driver doesn't know anything about VLAN interfaces.
 167                  * Hence, don't send GTKs for VLAN interfaces to the driver.
 168                  */
 169                 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE))
 170                         goto out_unsupported;
 171         }
 172
 173         ret = drv_set_key(key->local, SET_KEY, sdata,
 174                           sta ? &sta->sta : NULL, &key->conf);
 175
 176         if (!ret) {
 177                 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
 178
 179                 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
 180                       (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 181                         decrease_tailroom_need_count(sdata, 1);
 182
 183                 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
 184                         (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
 185
 186                 return 0;
 187         }
 188
 189         if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1)
 190                 sdata_err(sdata,
 191                           "failed to set key (%d, %pM) to hardware (%d)\n",
 192                           key->conf.keyidx,
 193                           sta ? sta->sta.addr : bcast_addr, ret);
 194
 195  out_unsupported:
 196         switch (key->conf.cipher) {
 197         case WLAN_CIPHER_SUITE_WEP40:
 198         case WLAN_CIPHER_SUITE_WEP104:
 199         case WLAN_CIPHER_SUITE_TKIP:
 200         case WLAN_CIPHER_SUITE_CCMP:
 201         case WLAN_CIPHER_SUITE_CCMP_256:
 202         case WLAN_CIPHER_SUITE_AES_CMAC:
 203         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 204         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 205         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 206         case WLAN_CIPHER_SUITE_GCMP:
 207         case WLAN_CIPHER_SUITE_GCMP_256:
 208                 /* all of these we can do in software - if driver can */
 209                 if (ret == 1)
 210                         return 0;
 211                 if (key->local->hw.flags & IEEE80211_HW_SW_CRYPTO_CONTROL)
 212                         return -EINVAL;
 213                 return 0;
 214         default:
 215                 return -EINVAL;
 216         }
 217 }
 218
 219 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
 220 {
 221         struct ieee80211_sub_if_data *sdata;
 222         struct sta_info *sta;
 223         int ret;
 224
 225         might_sleep();
 226
 227         if (!key || !key->local->ops->set_key)
 228                 return;
 229
 230         assert_key_lock(key->local);
 231
 232         if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 233                 return;
 234
 235         sta = key->sta;
 236         sdata = key->sdata;
 237
 238         if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
 239               (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 240                 increment_tailroom_need_count(sdata);
 241
 242         ret = drv_set_key(key->local, DISABLE_KEY, sdata,
 243                           sta ? &sta->sta : NULL, &key->conf);
 244
 245         if (ret)
 246                 sdata_err(sdata,
 247                           "failed to remove key (%d, %pM) from hardware (%d)\n",
 248                           key->conf.keyidx,
 249                           sta ? sta->sta.addr : bcast_addr, ret);
 250
 251         key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 252 }
 253
 254 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
 255                                         int idx, bool uni, bool multi)
 256 {
 257         struct ieee80211_key *key = NULL;
 258
 259         assert_key_lock(sdata->local);
 260
 261         if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
 262                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 263
 264         if (uni) {
 265                 rcu_assign_pointer(sdata->default_unicast_key, key);
 266                 drv_set_default_unicast_key(sdata->local, sdata, idx);
 267         }
 268
 269         if (multi)
 270                 rcu_assign_pointer(sdata->default_multicast_key, key);
 271
 272         ieee80211_debugfs_key_update_default(sdata);
 273 }
 274
 275 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
 276                                bool uni, bool multi)
 277 {
 278         mutex_lock(&sdata->local->key_mtx);
 279         __ieee80211_set_default_key(sdata, idx, uni, multi);
 280         mutex_unlock(&sdata->local->key_mtx);
 281 }
 282
 283 static void
 284 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
 285 {
 286         struct ieee80211_key *key = NULL;
 287
 288         assert_key_lock(sdata->local);
 289
 290         if (idx >= NUM_DEFAULT_KEYS &&
 291             idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
 292                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 293
 294         rcu_assign_pointer(sdata->default_mgmt_key, key);
 295
 296         ieee80211_debugfs_key_update_default(sdata);
 297 }
 298
 299 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
 300                                     int idx)
 301 {
 302         mutex_lock(&sdata->local->key_mtx);
 303         __ieee80211_set_default_mgmt_key(sdata, idx);
 304         mutex_unlock(&sdata->local->key_mtx);
 305 }
 306
 307
 308 static void ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
 309                                   struct sta_info *sta,
 310                                   bool pairwise,
 311                                   struct ieee80211_key *old,
 312                                   struct ieee80211_key *new)
 313 {
 314         int idx;
 315         bool defunikey, defmultikey, defmgmtkey;
 316
 317         /* caller must provide at least one old/new */
 318         if (WARN_ON(!new && !old))
 319                 return;
 320
 321         if (new)
 322                 list_add_tail(&new->list, &sdata->key_list);
 323
 324         WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
 325
 326         if (old)
 327                 idx = old->conf.keyidx;
 328         else
 329                 idx = new->conf.keyidx;
 330
 331         if (sta) {
 332                 if (pairwise) {
 333                         rcu_assign_pointer(sta->ptk[idx], new);
 334                         sta->ptk_idx = idx;
 335                 } else {
 336                         rcu_assign_pointer(sta->gtk[idx], new);
 337                         sta->gtk_idx = idx;
 338                 }
 339         } else {
 340                 defunikey = old &&
 341                         old == key_mtx_dereference(sdata->local,
 342                                                 sdata->default_unicast_key);
 343                 defmultikey = old &&
 344                         old == key_mtx_dereference(sdata->local,
 345                                                 sdata->default_multicast_key);
 346                 defmgmtkey = old &&
 347                         old == key_mtx_dereference(sdata->local,
 348                                                 sdata->default_mgmt_key);
 349
 350                 if (defunikey && !new)
 351                         __ieee80211_set_default_key(sdata, -1, true, false);
 352                 if (defmultikey && !new)
 353                         __ieee80211_set_default_key(sdata, -1, false, true);
 354                 if (defmgmtkey && !new)
 355                         __ieee80211_set_default_mgmt_key(sdata, -1);
 356
 357                 rcu_assign_pointer(sdata->keys[idx], new);
 358                 if (defunikey && new)
 359                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 360                                                     true, false);
 361                 if (defmultikey && new)
 362                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 363                                                     false, true);
 364                 if (defmgmtkey && new)
 365                         __ieee80211_set_default_mgmt_key(sdata,
 366                                                          new->conf.keyidx);
 367         }
 368
 369         if (old)
 370                 list_del(&old->list);
 371 }
 372
 373 struct ieee80211_key *
 374 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
 375                     const u8 *key_data,
 376                     size_t seq_len, const u8 *seq,
 377                     const struct ieee80211_cipher_scheme *cs)
 378 {
 379         struct ieee80211_key *key;
 380         int i, j, err;
 381
 382         if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS))
 383                 return ERR_PTR(-EINVAL);
 384
 385         key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
 386         if (!key)
 387                 return ERR_PTR(-ENOMEM);
 388
 389         /*
 390          * Default to software encryption; we'll later upload the
 391          * key to the hardware if possible.
 392          */
 393         key->conf.flags = 0;
 394         key->flags = 0;
 395
 396         key->conf.cipher = cipher;
 397         key->conf.keyidx = idx;
 398         key->conf.keylen = key_len;
 399         switch (cipher) {
 400         case WLAN_CIPHER_SUITE_WEP40:
 401         case WLAN_CIPHER_SUITE_WEP104:
 402                 key->conf.iv_len = IEEE80211_WEP_IV_LEN;
 403                 key->conf.icv_len = IEEE80211_WEP_ICV_LEN;
 404                 break;
 405         case WLAN_CIPHER_SUITE_TKIP:
 406                 key->conf.iv_len = IEEE80211_TKIP_IV_LEN;
 407                 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN;
 408                 if (seq) {
 409                         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
 410                                 key->u.tkip.rx[i].iv32 =
 411                                         get_unaligned_le32(&seq[2]);
 412                                 key->u.tkip.rx[i].iv16 =
 413                                         get_unaligned_le16(seq);
 414                         }
 415                 }
 416                 spin_lock_init(&key->u.tkip.txlock);
 417                 break;
 418         case WLAN_CIPHER_SUITE_CCMP:
 419                 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN;
 420                 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN;
 421                 if (seq) {
 422                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 423                                 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++)
 424                                         key->u.ccmp.rx_pn[i][j] =
 425                                                 seq[IEEE80211_CCMP_PN_LEN - j - 1];
 426                 }
 427                 /*
 428                  * Initialize AES key state here as an optimization so that
 429                  * it does not need to be initialized for every packet.
 430                  */
 431                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 432                         key_data, key_len, IEEE80211_CCMP_MIC_LEN);
 433                 if (IS_ERR(key->u.ccmp.tfm)) {
 434                         err = PTR_ERR(key->u.ccmp.tfm);
 435                         kfree(key);
 436                         return ERR_PTR(err);
 437                 }
 438                 break;
 439         case WLAN_CIPHER_SUITE_CCMP_256:
 440                 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN;
 441                 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN;
 442                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 443                         for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++)
 444                                 key->u.ccmp.rx_pn[i][j] =
 445                                         seq[IEEE80211_CCMP_256_PN_LEN - j - 1];
 446                 /* Initialize AES key state here as an optimization so that
 447                  * it does not need to be initialized for every packet.
 448                  */
 449                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 450                         key_data, key_len, IEEE80211_CCMP_256_MIC_LEN);
 451                 if (IS_ERR(key->u.ccmp.tfm)) {
 452                         err = PTR_ERR(key->u.ccmp.tfm);
 453                         kfree(key);
 454                         return ERR_PTR(err);
 455                 }
 456                 break;
 457         case WLAN_CIPHER_SUITE_AES_CMAC:
 458         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 459                 key->conf.iv_len = 0;
 460                 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
 461                         key->conf.icv_len = sizeof(struct ieee80211_mmie);
 462                 else
 463                         key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 464                 if (seq)
 465                         for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
 466                                 key->u.aes_cmac.rx_pn[j] =
 467                                         seq[IEEE80211_CMAC_PN_LEN - j - 1];
 468                 /*
 469                  * Initialize AES key state here as an optimization so that
 470                  * it does not need to be initialized for every packet.
 471                  */
 472                 key->u.aes_cmac.tfm =
 473                         ieee80211_aes_cmac_key_setup(key_data, key_len);
 474                 if (IS_ERR(key->u.aes_cmac.tfm)) {
 475                         err = PTR_ERR(key->u.aes_cmac.tfm);
 476                         kfree(key);
 477                         return ERR_PTR(err);
 478                 }
 479                 break;
 480         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 481         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 482                 key->conf.iv_len = 0;
 483                 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 484                 if (seq)
 485                         for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++)
 486                                 key->u.aes_gmac.rx_pn[j] =
 487                                         seq[IEEE80211_GMAC_PN_LEN - j - 1];
 488                 /* Initialize AES key state here as an optimization so that
 489                  * it does not need to be initialized for every packet.
 490                  */
 491                 key->u.aes_gmac.tfm =
 492                         ieee80211_aes_gmac_key_setup(key_data, key_len);
 493                 if (IS_ERR(key->u.aes_gmac.tfm)) {
 494                         err = PTR_ERR(key->u.aes_gmac.tfm);
 495                         kfree(key);
 496                         return ERR_PTR(err);
 497                 }
 498                 break;
 499         case WLAN_CIPHER_SUITE_GCMP:
 500         case WLAN_CIPHER_SUITE_GCMP_256:
 501                 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
 502                 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
 503                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 504                         for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
 505                                 key->u.gcmp.rx_pn[i][j] =
 506                                         seq[IEEE80211_GCMP_PN_LEN - j - 1];
 507                 /* Initialize AES key state here as an optimization so that
 508                  * it does not need to be initialized for every packet.
 509                  */
 510                 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
 511                                                                       key_len);
 512                 if (IS_ERR(key->u.gcmp.tfm)) {
 513                         err = PTR_ERR(key->u.gcmp.tfm);
 514                         kfree(key);
 515                         return ERR_PTR(err);
 516                 }
 517                 break;
 518         default:
 519                 if (cs) {
 520                         size_t len = (seq_len > MAX_PN_LEN) ?
 521                                                 MAX_PN_LEN : seq_len;
 522
 523                         key->conf.iv_len = cs->hdr_len;
 524                         key->conf.icv_len = cs->mic_len;
 525                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 526                                 for (j = 0; j < len; j++)
 527                                         key->u.gen.rx_pn[i][j] =
 528                                                         seq[len - j - 1];
 529                         key->flags |= KEY_FLAG_CIPHER_SCHEME;
 530                 }
 531         }
 532         memcpy(key->conf.key, key_data, key_len);
 533         INIT_LIST_HEAD(&key->list);
 534
 535         return key;
 536 }
 537
 538 static void ieee80211_key_free_common(struct ieee80211_key *key)
 539 {
 540         switch (key->conf.cipher) {
 541         case WLAN_CIPHER_SUITE_CCMP:
 542         case WLAN_CIPHER_SUITE_CCMP_256:
 543                 ieee80211_aes_key_free(key->u.ccmp.tfm);
 544                 break;
 545         case WLAN_CIPHER_SUITE_AES_CMAC:
 546         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 547                 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
 548                 break;
 549         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 550         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 551                 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm);
 552                 break;
 553         case WLAN_CIPHER_SUITE_GCMP:
 554         case WLAN_CIPHER_SUITE_GCMP_256:
 555                 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
 556                 break;
 557         }
 558         kzfree(key);
 559 }
 560
 561 static void __ieee80211_key_destroy(struct ieee80211_key *key,
 562                                     bool delay_tailroom)
 563 {
 564         if (key->local)
 565                 ieee80211_key_disable_hw_accel(key);
 566
 567         if (key->local) {
 568                 struct ieee80211_sub_if_data *sdata = key->sdata;
 569
 570                 ieee80211_debugfs_key_remove(key);
 571
 572                 if (delay_tailroom) {
 573                         /* see ieee80211_delayed_tailroom_dec */
 574                         sdata->crypto_tx_tailroom_pending_dec++;
 575                         schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
 576                                               HZ/2);
 577                 } else {
 578                         decrease_tailroom_need_count(sdata, 1);
 579                 }
 580         }
 581
 582         ieee80211_key_free_common(key);
 583 }
 584
 585 static void ieee80211_key_destroy(struct ieee80211_key *key,
 586                                   bool delay_tailroom)
 587 {
 588         if (!key)
 589                 return;
 590
 591         /*
 592          * Synchronize so the TX path can no longer be using
 593          * this key before we free/remove it.
 594          */
 595         synchronize_net();
 596
 597         __ieee80211_key_destroy(key, delay_tailroom);
 598 }
 599
 600 void ieee80211_key_free_unused(struct ieee80211_key *key)
 601 {
 602         WARN_ON(key->sdata || key->local);
 603         ieee80211_key_free_common(key);
 604 }
 605
 606 int ieee80211_key_link(struct ieee80211_key *key,
 607                        struct ieee80211_sub_if_data *sdata,
 608                        struct sta_info *sta)
 609 {
 610         struct ieee80211_local *local = sdata->local;
 611         struct ieee80211_key *old_key;
 612         int idx, ret;
 613         bool pairwise;
 614
 615         pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
 616         idx = key->conf.keyidx;
 617         key->local = sdata->local;
 618         key->sdata = sdata;
 619         key->sta = sta;
 620
 621         mutex_lock(&sdata->local->key_mtx);
 622
 623         if (sta && pairwise)
 624                 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
 625         else if (sta)
 626                 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
 627         else
 628                 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 629
 630         increment_tailroom_need_count(sdata);
 631
 632         ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
 633         ieee80211_key_destroy(old_key, true);
 634
 635         ieee80211_debugfs_key_add(key);
 636
 637         if (!local->wowlan) {
 638                 ret = ieee80211_key_enable_hw_accel(key);
 639                 if (ret)
 640                         ieee80211_key_free(key, true);
 641         } else {
 642                 ret = 0;
 643         }
 644
 645         mutex_unlock(&sdata->local->key_mtx);
 646
 647         return ret;
 648 }
 649
 650 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
 651 {
 652         if (!key)
 653                 return;
 654
 655         /*
 656          * Replace key with nothingness if it was ever used.
 657          */
 658         if (key->sdata)
 659                 ieee80211_key_replace(key->sdata, key->sta,
 660                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 661                                 key, NULL);
 662         ieee80211_key_destroy(key, delay_tailroom);
 663 }
 664
 665 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
 666 {
 667         struct ieee80211_key *key;
 668         struct ieee80211_sub_if_data *vlan;
 669
 670         ASSERT_RTNL();
 671
 672         if (WARN_ON(!ieee80211_sdata_running(sdata)))
 673                 return;
 674
 675         mutex_lock(&sdata->local->key_mtx);
 676
 677         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
 678                      sdata->crypto_tx_tailroom_pending_dec);
 679
 680         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 681                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 682                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
 683                                      vlan->crypto_tx_tailroom_pending_dec);
 684         }
 685
 686         list_for_each_entry(key, &sdata->key_list, list) {
 687                 increment_tailroom_need_count(sdata);
 688                 ieee80211_key_enable_hw_accel(key);
 689         }
 690
 691         mutex_unlock(&sdata->local->key_mtx);
 692 }
 693
 694 void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata)
 695 {
 696         struct ieee80211_sub_if_data *vlan;
 697
 698         mutex_lock(&sdata->local->key_mtx);
 699
 700         sdata->crypto_tx_tailroom_needed_cnt = 0;
 701
 702         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 703                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 704                         vlan->crypto_tx_tailroom_needed_cnt = 0;
 705         }
 706
 707         mutex_unlock(&sdata->local->key_mtx);
 708 }
 709
 710 void ieee80211_iter_keys(struct ieee80211_hw *hw,
 711                          struct ieee80211_vif *vif,
 712                          void (*iter)(struct ieee80211_hw *hw,
 713                                       struct ieee80211_vif *vif,
 714                                       struct ieee80211_sta *sta,
 715                                       struct ieee80211_key_conf *key,
 716                                       void *data),
 717                          void *iter_data)
 718 {
 719         struct ieee80211_local *local = hw_to_local(hw);
 720         struct ieee80211_key *key, *tmp;
 721         struct ieee80211_sub_if_data *sdata;
 722
 723         ASSERT_RTNL();
 724
 725         mutex_lock(&local->key_mtx);
 726         if (vif) {
 727                 sdata = vif_to_sdata(vif);
 728                 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
 729                         iter(hw, &sdata->vif,
 730                              key->sta ? &key->sta->sta : NULL,
 731                              &key->conf, iter_data);
 732         } else {
 733                 list_for_each_entry(sdata, &local->interfaces, list)
 734                         list_for_each_entry_safe(key, tmp,
 735                                                  &sdata->key_list, list)
 736                                 iter(hw, &sdata->vif,
 737                                      key->sta ? &key->sta->sta : NULL,
 738                                      &key->conf, iter_data);
 739         }
 740         mutex_unlock(&local->key_mtx);
 741 }
 742 EXPORT_SYMBOL(ieee80211_iter_keys);
 743
 744 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
 745                                       struct list_head *keys)
 746 {
 747         struct ieee80211_key *key, *tmp;
 748
 749         decrease_tailroom_need_count(sdata,
 750                                      sdata->crypto_tx_tailroom_pending_dec);
 751         sdata->crypto_tx_tailroom_pending_dec = 0;
 752
 753         ieee80211_debugfs_key_remove_mgmt_default(sdata);
 754
 755         list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
 756                 ieee80211_key_replace(key->sdata, key->sta,
 757                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 758                                 key, NULL);
 759                 list_add_tail(&key->list, keys);
 760         }
 761
 762         ieee80211_debugfs_key_update_default(sdata);
 763 }
 764
 765 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
 766                          bool force_synchronize)
 767 {
 768         struct ieee80211_local *local = sdata->local;
 769         struct ieee80211_sub_if_data *vlan;
 770         struct ieee80211_sub_if_data *master;
 771         struct ieee80211_key *key, *tmp;
 772         LIST_HEAD(keys);
 773
 774         cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
 775
 776         mutex_lock(&local->key_mtx);
 777
 778         ieee80211_free_keys_iface(sdata, &keys);
 779
 780         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 781                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 782                         ieee80211_free_keys_iface(vlan, &keys);
 783         }
 784
 785         if (!list_empty(&keys) || force_synchronize)
 786                 synchronize_net();
 787         list_for_each_entry_safe(key, tmp, &keys, list)
 788                 __ieee80211_key_destroy(key, false);
 789
 790         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 791                 if (sdata->bss) {
 792                         master = container_of(sdata->bss,
 793                                               struct ieee80211_sub_if_data,
 794                                               u.ap);
 795
 796                         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
 797                                      master->crypto_tx_tailroom_needed_cnt);
 798                 }
 799         } else {
 800                 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
 801                              sdata->crypto_tx_tailroom_pending_dec);
 802         }
 803
 804         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 805                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
 806                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
 807                                      vlan->crypto_tx_tailroom_pending_dec);
 808         }
 809
 810         mutex_unlock(&local->key_mtx);
 811 }
 812
 813 void ieee80211_free_sta_keys(struct ieee80211_local *local,
 814                              struct sta_info *sta)
 815 {
 816         struct ieee80211_key *key;
 817         int i;
 818
 819         mutex_lock(&local->key_mtx);
 820         for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) {
 821                 key = key_mtx_dereference(local, sta->gtk[i]);
 822                 if (!key)
 823                         continue;
 824                 ieee80211_key_replace(key->sdata, key->sta,
 825                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 826                                 key, NULL);
 827                 __ieee80211_key_destroy(key, true);
 828         }
 829
 830         for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
 831                 key = key_mtx_dereference(local, sta->ptk[i]);
 832                 if (!key)
 833                         continue;
 834                 ieee80211_key_replace(key->sdata, key->sta,
 835                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 836                                 key, NULL);
 837                 __ieee80211_key_destroy(key, true);
 838         }
 839
 840         mutex_unlock(&local->key_mtx);
 841 }
 842
 843 void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
 844 {
 845         struct ieee80211_sub_if_data *sdata;
 846
 847         sdata = container_of(wk, struct ieee80211_sub_if_data,
 848                              dec_tailroom_needed_wk.work);
 849
 850         /*
 851          * The reason for the delayed tailroom needed decrementing is to
 852          * make roaming faster: during roaming, all keys are first deleted
 853          * and then new keys are installed. The first new key causes the
 854          * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
 855          * the cost of synchronize_net() (which can be slow). Avoid this
 856          * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
 857          * key removal for a while, so if we roam the value is larger than
 858          * zero and no 0->1 transition happens.
 859          *
 860          * The cost is that if the AP switching was from an AP with keys
 861          * to one without, we still allocate tailroom while it would no
 862          * longer be needed. However, in the typical (fast) roaming case
 863          * within an ESS this usually won't happen.
 864          */
 865
 866         mutex_lock(&sdata->local->key_mtx);
 867         decrease_tailroom_need_count(sdata,
 868                                      sdata->crypto_tx_tailroom_pending_dec);
 869         sdata->crypto_tx_tailroom_pending_dec = 0;
 870         mutex_unlock(&sdata->local->key_mtx);
 871 }
 872
 873 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
 874                                 const u8 *replay_ctr, gfp_t gfp)
 875 {
 876         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 877
 878         trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
 879
 880         cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
 881 }
 882 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
 883
 884 void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf,
 885                               struct ieee80211_key_seq *seq)
 886 {
 887         struct ieee80211_key *key;
 888         u64 pn64;
 889
 890         if (WARN_ON(!(keyconf->flags & IEEE80211_KEY_FLAG_GENERATE_IV)))
 891                 return;
 892
 893         key = container_of(keyconf, struct ieee80211_key, conf);
 894
 895         switch (key->conf.cipher) {
 896         case WLAN_CIPHER_SUITE_TKIP:
 897                 seq->tkip.iv32 = key->u.tkip.tx.iv32;
 898                 seq->tkip.iv16 = key->u.tkip.tx.iv16;
 899                 break;
 900         case WLAN_CIPHER_SUITE_CCMP:
 901         case WLAN_CIPHER_SUITE_CCMP_256:
 902                 pn64 = atomic64_read(&key->u.ccmp.tx_pn);
 903                 seq->ccmp.pn[5] = pn64;
 904                 seq->ccmp.pn[4] = pn64 >> 8;
 905                 seq->ccmp.pn[3] = pn64 >> 16;
 906                 seq->ccmp.pn[2] = pn64 >> 24;
 907                 seq->ccmp.pn[1] = pn64 >> 32;
 908                 seq->ccmp.pn[0] = pn64 >> 40;
 909                 break;
 910         case WLAN_CIPHER_SUITE_AES_CMAC:
 911         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 912                 pn64 = atomic64_read(&key->u.aes_cmac.tx_pn);
 913                 seq->ccmp.pn[5] = pn64;
 914                 seq->ccmp.pn[4] = pn64 >> 8;
 915                 seq->ccmp.pn[3] = pn64 >> 16;
 916                 seq->ccmp.pn[2] = pn64 >> 24;
 917                 seq->ccmp.pn[1] = pn64 >> 32;
 918                 seq->ccmp.pn[0] = pn64 >> 40;
 919                 break;
 920         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 921         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 922                 pn64 = atomic64_read(&key->u.aes_gmac.tx_pn);
 923                 seq->ccmp.pn[5] = pn64;
 924                 seq->ccmp.pn[4] = pn64 >> 8;
 925                 seq->ccmp.pn[3] = pn64 >> 16;
 926                 seq->ccmp.pn[2] = pn64 >> 24;
 927                 seq->ccmp.pn[1] = pn64 >> 32;
 928                 seq->ccmp.pn[0] = pn64 >> 40;
 929                 break;
 930         case WLAN_CIPHER_SUITE_GCMP:
 931         case WLAN_CIPHER_SUITE_GCMP_256:
 932                 pn64 = atomic64_read(&key->u.gcmp.tx_pn);
 933                 seq->gcmp.pn[5] = pn64;
 934                 seq->gcmp.pn[4] = pn64 >> 8;
 935                 seq->gcmp.pn[3] = pn64 >> 16;
 936                 seq->gcmp.pn[2] = pn64 >> 24;
 937                 seq->gcmp.pn[1] = pn64 >> 32;
 938                 seq->gcmp.pn[0] = pn64 >> 40;
 939                 break;
 940         default:
 941                 WARN_ON(1);
 942         }
 943 }
 944 EXPORT_SYMBOL(ieee80211_get_key_tx_seq);
 945
 946 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
 947                               int tid, struct ieee80211_key_seq *seq)
 948 {
 949         struct ieee80211_key *key;
 950         const u8 *pn;
 951
 952         key = container_of(keyconf, struct ieee80211_key, conf);
 953
 954         switch (key->conf.cipher) {
 955         case WLAN_CIPHER_SUITE_TKIP:
 956                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
 957                         return;
 958                 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
 959                 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
 960                 break;
 961         case WLAN_CIPHER_SUITE_CCMP:
 962         case WLAN_CIPHER_SUITE_CCMP_256:
 963                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
 964                         return;
 965                 if (tid < 0)
 966                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
 967                 else
 968                         pn = key->u.ccmp.rx_pn[tid];
 969                 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
 970                 break;
 971         case WLAN_CIPHER_SUITE_AES_CMAC:
 972         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 973                 if (WARN_ON(tid != 0))
 974                         return;
 975                 pn = key->u.aes_cmac.rx_pn;
 976                 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
 977                 break;
 978         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 979         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 980                 if (WARN_ON(tid != 0))
 981                         return;
 982                 pn = key->u.aes_gmac.rx_pn;
 983                 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
 984                 break;
 985         case WLAN_CIPHER_SUITE_GCMP:
 986         case WLAN_CIPHER_SUITE_GCMP_256:
 987                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
 988                         return;
 989                 if (tid < 0)
 990                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
 991                 else
 992                         pn = key->u.gcmp.rx_pn[tid];
 993                 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
 994                 break;
 995         }
 996 }
 997 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
 998
 999 void ieee80211_set_key_tx_seq(struct ieee80211_key_conf *keyconf,
1000                               struct ieee80211_key_seq *seq)
1001 {
1002         struct ieee80211_key *key;
1003         u64 pn64;
1004
1005         key = container_of(keyconf, struct ieee80211_key, conf);
1006
1007         switch (key->conf.cipher) {
1008         case WLAN_CIPHER_SUITE_TKIP:
1009                 key->u.tkip.tx.iv32 = seq->tkip.iv32;
1010                 key->u.tkip.tx.iv16 = seq->tkip.iv16;
1011                 break;
1012         case WLAN_CIPHER_SUITE_CCMP:
1013         case WLAN_CIPHER_SUITE_CCMP_256:
1014                 pn64 = (u64)seq->ccmp.pn[5] |
1015                        ((u64)seq->ccmp.pn[4] << 8) |
1016                        ((u64)seq->ccmp.pn[3] << 16) |
1017                        ((u64)seq->ccmp.pn[2] << 24) |
1018                        ((u64)seq->ccmp.pn[1] << 32) |
1019                        ((u64)seq->ccmp.pn[0] << 40);
1020                 atomic64_set(&key->u.ccmp.tx_pn, pn64);
1021                 break;
1022         case WLAN_CIPHER_SUITE_AES_CMAC:
1023         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1024                 pn64 = (u64)seq->aes_cmac.pn[5] |
1025                        ((u64)seq->aes_cmac.pn[4] << 8) |
1026                        ((u64)seq->aes_cmac.pn[3] << 16) |
1027                        ((u64)seq->aes_cmac.pn[2] << 24) |
1028                        ((u64)seq->aes_cmac.pn[1] << 32) |
1029                        ((u64)seq->aes_cmac.pn[0] << 40);
1030                 atomic64_set(&key->u.aes_cmac.tx_pn, pn64);
1031                 break;
1032         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1033         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1034                 pn64 = (u64)seq->aes_gmac.pn[5] |
1035                        ((u64)seq->aes_gmac.pn[4] << 8) |
1036                        ((u64)seq->aes_gmac.pn[3] << 16) |
1037                        ((u64)seq->aes_gmac.pn[2] << 24) |
1038                        ((u64)seq->aes_gmac.pn[1] << 32) |
1039                        ((u64)seq->aes_gmac.pn[0] << 40);
1040                 atomic64_set(&key->u.aes_gmac.tx_pn, pn64);
1041                 break;
1042         case WLAN_CIPHER_SUITE_GCMP:
1043         case WLAN_CIPHER_SUITE_GCMP_256:
1044                 pn64 = (u64)seq->gcmp.pn[5] |
1045                        ((u64)seq->gcmp.pn[4] << 8) |
1046                        ((u64)seq->gcmp.pn[3] << 16) |
1047                        ((u64)seq->gcmp.pn[2] << 24) |
1048                        ((u64)seq->gcmp.pn[1] << 32) |
1049                        ((u64)seq->gcmp.pn[0] << 40);
1050                 atomic64_set(&key->u.gcmp.tx_pn, pn64);
1051                 break;
1052         default:
1053                 WARN_ON(1);
1054                 break;
1055         }
1056 }
1057 EXPORT_SYMBOL_GPL(ieee80211_set_key_tx_seq);
1058
1059 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1060                               int tid, struct ieee80211_key_seq *seq)
1061 {
1062         struct ieee80211_key *key;
1063         u8 *pn;
1064
1065         key = container_of(keyconf, struct ieee80211_key, conf);
1066
1067         switch (key->conf.cipher) {
1068         case WLAN_CIPHER_SUITE_TKIP:
1069                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1070                         return;
1071                 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1072                 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1073                 break;
1074         case WLAN_CIPHER_SUITE_CCMP:
1075         case WLAN_CIPHER_SUITE_CCMP_256:
1076                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1077                         return;
1078                 if (tid < 0)
1079                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1080                 else
1081                         pn = key->u.ccmp.rx_pn[tid];
1082                 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1083                 break;
1084         case WLAN_CIPHER_SUITE_AES_CMAC:
1085         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1086                 if (WARN_ON(tid != 0))
1087                         return;
1088                 pn = key->u.aes_cmac.rx_pn;
1089                 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1090                 break;
1091         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1092         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1093                 if (WARN_ON(tid != 0))
1094                         return;
1095                 pn = key->u.aes_gmac.rx_pn;
1096                 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1097                 break;
1098         case WLAN_CIPHER_SUITE_GCMP:
1099         case WLAN_CIPHER_SUITE_GCMP_256:
1100                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1101                         return;
1102                 if (tid < 0)
1103                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1104                 else
1105                         pn = key->u.gcmp.rx_pn[tid];
1106                 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1107                 break;
1108         default:
1109                 WARN_ON(1);
1110                 break;
1111         }
1112 }
1113 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1114
1115 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1116 {
1117         struct ieee80211_key *key;
1118
1119         key = container_of(keyconf, struct ieee80211_key, conf);
1120
1121         assert_key_lock(key->local);
1122
1123         /*
1124          * if key was uploaded, we assume the driver will/has remove(d)
1125          * it, so adjust bookkeeping accordingly
1126          */
1127         if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1128                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1129
1130                 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
1131                       (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1132                         increment_tailroom_need_count(key->sdata);
1133         }
1134
1135         ieee80211_key_free(key, false);
1136 }
1137 EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1138
1139 struct ieee80211_key_conf *
1140 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1141                         struct ieee80211_key_conf *keyconf)
1142 {
1143         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1144         struct ieee80211_local *local = sdata->local;
1145         struct ieee80211_key *key;
1146         int err;
1147
1148         if (WARN_ON(!local->wowlan))
1149                 return ERR_PTR(-EINVAL);
1150
1151         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1152                 return ERR_PTR(-EINVAL);
1153
1154         key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1155                                   keyconf->keylen, keyconf->key,
1156                                   0, NULL, NULL);
1157         if (IS_ERR(key))
1158                 return ERR_CAST(key);
1159
1160         if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1161                 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1162
1163         err = ieee80211_key_link(key, sdata, NULL);
1164         if (err)
1165                 return ERR_PTR(err);
1166
1167         return &key->conf;
1168 }
1169 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);