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