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  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/if_ether.h>
  13 #include <linux/etherdevice.h>
  14 #include <linux/list.h>
  15 #include <linux/rcupdate.h>
  16 #include <linux/rtnetlink.h>
  17 #include <linux/slab.h>
  18 #include <net/mac80211.h>
  19 #include "ieee80211_i.h"
  20 #include "driver-ops.h"
  21 #include "debugfs_key.h"
  22 #include "aes_ccm.h"
  23 #include "aes_cmac.h"
  24
  25
  26 /**
  27  * DOC: Key handling basics
  28  *
  29  * Key handling in mac80211 is done based on per-interface (sub_if_data)
  30  * keys and per-station keys. Since each station belongs to an interface,
  31  * each station key also belongs to that interface.
  32  *
  33  * Hardware acceleration is done on a best-effort basis for algorithms
  34  * that are implemented in software,  for each key the hardware is asked
  35  * to enable that key for offloading but if it cannot do that the key is
  36  * simply kept for software encryption (unless it is for an algorithm
  37  * that isn't implemented in software).
  38  * There is currently no way of knowing whether a key is handled in SW
  39  * or HW except by looking into debugfs.
  40  *
  41  * All key management is internally protected by a mutex. Within all
  42  * other parts of mac80211, key references are, just as STA structure
  43  * references, protected by RCU. Note, however, that some things are
  44  * unprotected, namely the key->sta dereferences within the hardware
  45  * acceleration functions. This means that sta_info_destroy() must
  46  * remove the key which waits for an RCU grace period.
  47  */
  48
  49 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
  50
  51 static void assert_key_lock(struct ieee80211_local *local)
  52 {
  53         lockdep_assert_held(&local->key_mtx);
  54 }
  55
  56 static struct ieee80211_sta *get_sta_for_key(struct ieee80211_key *key)
  57 {
  58         if (key->sta)
  59                 return &key->sta->sta;
  60
  61         return NULL;
  62 }
  63
  64 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
  65 {
  66         /*
  67          * When this count is zero, SKB resizing for allocating tailroom
  68          * for IV or MMIC is skipped. But, this check has created two race
  69          * cases in xmit path while transiting from zero count to one:
  70          *
  71          * 1. SKB resize was skipped because no key was added but just before
  72          * the xmit key is added and SW encryption kicks off.
  73          *
  74          * 2. SKB resize was skipped because all the keys were hw planted but
  75          * just before xmit one of the key is deleted and SW encryption kicks
  76          * off.
  77          *
  78          * In both the above case SW encryption will find not enough space for
  79          * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
  80          *
  81          * Solution has been explained at
  82          * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
  83          */
  84
  85         if (!sdata->crypto_tx_tailroom_needed_cnt++) {
  86                 /*
  87                  * Flush all XMIT packets currently using HW encryption or no
  88                  * encryption at all if the count transition is from 0 -> 1.
  89                  */
  90                 synchronize_net();
  91         }
  92 }
  93
  94 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
  95 {
  96         struct ieee80211_sub_if_data *sdata;
  97         struct ieee80211_sta *sta;
  98         int ret;
  99
 100         might_sleep();
 101
 102         if (!key->local->ops->set_key)
 103                 goto out_unsupported;
 104
 105         assert_key_lock(key->local);
 106
 107         sta = get_sta_for_key(key);
 108
 109         /*
 110          * If this is a per-STA GTK, check if it
 111          * is supported; if not, return.
 112          */
 113         if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) &&
 114             !(key->local->hw.flags & IEEE80211_HW_SUPPORTS_PER_STA_GTK))
 115                 goto out_unsupported;
 116
 117         sdata = key->sdata;
 118         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 119                 /*
 120                  * The driver doesn't know anything about VLAN interfaces.
 121                  * Hence, don't send GTKs for VLAN interfaces to the driver.
 122                  */
 123                 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE))
 124                         goto out_unsupported;
 125                 sdata = container_of(sdata->bss,
 126                                      struct ieee80211_sub_if_data,
 127                                      u.ap);
 128         }
 129
 130         ret = drv_set_key(key->local, SET_KEY, sdata, sta, &key->conf);
 131
 132         if (!ret) {
 133                 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
 134
 135                 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
 136                       (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)))
 137                         sdata->crypto_tx_tailroom_needed_cnt--;
 138
 139                 return 0;
 140         }
 141
 142         if (ret != -ENOSPC && ret != -EOPNOTSUPP)
 143                 wiphy_err(key->local->hw.wiphy,
 144                           "failed to set key (%d, %pM) to hardware (%d)\n",
 145                           key->conf.keyidx, sta ? sta->addr : bcast_addr, ret);
 146
 147  out_unsupported:
 148         switch (key->conf.cipher) {
 149         case WLAN_CIPHER_SUITE_WEP40:
 150         case WLAN_CIPHER_SUITE_WEP104:
 151         case WLAN_CIPHER_SUITE_TKIP:
 152         case WLAN_CIPHER_SUITE_CCMP:
 153         case WLAN_CIPHER_SUITE_AES_CMAC:
 154                 /* all of these we can do in software */
 155                 return 0;
 156         default:
 157                 return -EINVAL;
 158         }
 159 }
 160
 161 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
 162 {
 163         struct ieee80211_sub_if_data *sdata;
 164         struct ieee80211_sta *sta;
 165         int ret;
 166
 167         might_sleep();
 168
 169         if (!key || !key->local->ops->set_key)
 170                 return;
 171
 172         assert_key_lock(key->local);
 173
 174         if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 175                 return;
 176
 177         sta = get_sta_for_key(key);
 178         sdata = key->sdata;
 179
 180         if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
 181               (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)))
 182                 increment_tailroom_need_count(sdata);
 183
 184         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 185                 sdata = container_of(sdata->bss,
 186                                      struct ieee80211_sub_if_data,
 187                                      u.ap);
 188
 189         ret = drv_set_key(key->local, DISABLE_KEY, sdata,
 190                           sta, &key->conf);
 191
 192         if (ret)
 193                 wiphy_err(key->local->hw.wiphy,
 194                           "failed to remove key (%d, %pM) from hardware (%d)\n",
 195                           key->conf.keyidx, sta ? sta->addr : bcast_addr, ret);
 196
 197         key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 198 }
 199
 200 void ieee80211_key_removed(struct ieee80211_key_conf *key_conf)
 201 {
 202         struct ieee80211_key *key;
 203
 204         key = container_of(key_conf, struct ieee80211_key, conf);
 205
 206         might_sleep();
 207         assert_key_lock(key->local);
 208
 209         key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 210
 211         /*
 212          * Flush TX path to avoid attempts to use this key
 213          * after this function returns. Until then, drivers
 214          * must be prepared to handle the key.
 215          */
 216         synchronize_rcu();
 217 }
 218 EXPORT_SYMBOL_GPL(ieee80211_key_removed);
 219
 220 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
 221                                         int idx, bool uni, bool multi)
 222 {
 223         struct ieee80211_key *key = NULL;
 224
 225         assert_key_lock(sdata->local);
 226
 227         if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
 228                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 229
 230         if (uni)
 231                 rcu_assign_pointer(sdata->default_unicast_key, key);
 232         if (multi)
 233                 rcu_assign_pointer(sdata->default_multicast_key, key);
 234
 235         ieee80211_debugfs_key_update_default(sdata);
 236 }
 237
 238 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
 239                                bool uni, bool multi)
 240 {
 241         mutex_lock(&sdata->local->key_mtx);
 242         __ieee80211_set_default_key(sdata, idx, uni, multi);
 243         mutex_unlock(&sdata->local->key_mtx);
 244 }
 245
 246 static void
 247 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
 248 {
 249         struct ieee80211_key *key = NULL;
 250
 251         assert_key_lock(sdata->local);
 252
 253         if (idx >= NUM_DEFAULT_KEYS &&
 254             idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
 255                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 256
 257         rcu_assign_pointer(sdata->default_mgmt_key, key);
 258
 259         ieee80211_debugfs_key_update_default(sdata);
 260 }
 261
 262 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
 263                                     int idx)
 264 {
 265         mutex_lock(&sdata->local->key_mtx);
 266         __ieee80211_set_default_mgmt_key(sdata, idx);
 267         mutex_unlock(&sdata->local->key_mtx);
 268 }
 269
 270
 271 static void __ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
 272                                     struct sta_info *sta,
 273                                     bool pairwise,
 274                                     struct ieee80211_key *old,
 275                                     struct ieee80211_key *new)
 276 {
 277         int idx;
 278         bool defunikey, defmultikey, defmgmtkey;
 279
 280         if (new)
 281                 list_add_tail(&new->list, &sdata->key_list);
 282
 283         if (sta && pairwise) {
 284                 rcu_assign_pointer(sta->ptk, new);
 285         } else if (sta) {
 286                 if (old)
 287                         idx = old->conf.keyidx;
 288                 else
 289                         idx = new->conf.keyidx;
 290                 rcu_assign_pointer(sta->gtk[idx], new);
 291         } else {
 292                 WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
 293
 294                 if (old)
 295                         idx = old->conf.keyidx;
 296                 else
 297                         idx = new->conf.keyidx;
 298
 299                 defunikey = old &&
 300                         old == key_mtx_dereference(sdata->local,
 301                                                 sdata->default_unicast_key);
 302                 defmultikey = old &&
 303                         old == key_mtx_dereference(sdata->local,
 304                                                 sdata->default_multicast_key);
 305                 defmgmtkey = old &&
 306                         old == key_mtx_dereference(sdata->local,
 307                                                 sdata->default_mgmt_key);
 308
 309                 if (defunikey && !new)
 310                         __ieee80211_set_default_key(sdata, -1, true, false);
 311                 if (defmultikey && !new)
 312                         __ieee80211_set_default_key(sdata, -1, false, true);
 313                 if (defmgmtkey && !new)
 314                         __ieee80211_set_default_mgmt_key(sdata, -1);
 315
 316                 rcu_assign_pointer(sdata->keys[idx], new);
 317                 if (defunikey && new)
 318                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 319                                                     true, false);
 320                 if (defmultikey && new)
 321                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 322                                                     false, true);
 323                 if (defmgmtkey && new)
 324                         __ieee80211_set_default_mgmt_key(sdata,
 325                                                          new->conf.keyidx);
 326         }
 327
 328         if (old)
 329                 list_del(&old->list);
 330 }
 331
 332 struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
 333                                           const u8 *key_data,
 334                                           size_t seq_len, const u8 *seq)
 335 {
 336         struct ieee80211_key *key;
 337         int i, j, err;
 338
 339         BUG_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS);
 340
 341         key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
 342         if (!key)
 343                 return ERR_PTR(-ENOMEM);
 344
 345         /*
 346          * Default to software encryption; we'll later upload the
 347          * key to the hardware if possible.
 348          */
 349         key->conf.flags = 0;
 350         key->flags = 0;
 351
 352         key->conf.cipher = cipher;
 353         key->conf.keyidx = idx;
 354         key->conf.keylen = key_len;
 355         switch (cipher) {
 356         case WLAN_CIPHER_SUITE_WEP40:
 357         case WLAN_CIPHER_SUITE_WEP104:
 358                 key->conf.iv_len = WEP_IV_LEN;
 359                 key->conf.icv_len = WEP_ICV_LEN;
 360                 break;
 361         case WLAN_CIPHER_SUITE_TKIP:
 362                 key->conf.iv_len = TKIP_IV_LEN;
 363                 key->conf.icv_len = TKIP_ICV_LEN;
 364                 if (seq) {
 365                         for (i = 0; i < NUM_RX_DATA_QUEUES; i++) {
 366                                 key->u.tkip.rx[i].iv32 =
 367                                         get_unaligned_le32(&seq[2]);
 368                                 key->u.tkip.rx[i].iv16 =
 369                                         get_unaligned_le16(seq);
 370                         }
 371                 }
 372                 spin_lock_init(&key->u.tkip.txlock);
 373                 break;
 374         case WLAN_CIPHER_SUITE_CCMP:
 375                 key->conf.iv_len = CCMP_HDR_LEN;
 376                 key->conf.icv_len = CCMP_MIC_LEN;
 377                 if (seq) {
 378                         for (i = 0; i < NUM_RX_DATA_QUEUES + 1; i++)
 379                                 for (j = 0; j < CCMP_PN_LEN; j++)
 380                                         key->u.ccmp.rx_pn[i][j] =
 381                                                 seq[CCMP_PN_LEN - j - 1];
 382                 }
 383                 /*
 384                  * Initialize AES key state here as an optimization so that
 385                  * it does not need to be initialized for every packet.
 386                  */
 387                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(key_data);
 388                 if (IS_ERR(key->u.ccmp.tfm)) {
 389                         err = PTR_ERR(key->u.ccmp.tfm);
 390                         kfree(key);
 391                         return ERR_PTR(err);
 392                 }
 393                 break;
 394         case WLAN_CIPHER_SUITE_AES_CMAC:
 395                 key->conf.iv_len = 0;
 396                 key->conf.icv_len = sizeof(struct ieee80211_mmie);
 397                 if (seq)
 398                         for (j = 0; j < 6; j++)
 399                                 key->u.aes_cmac.rx_pn[j] = seq[6 - j - 1];
 400                 /*
 401                  * Initialize AES key state here as an optimization so that
 402                  * it does not need to be initialized for every packet.
 403                  */
 404                 key->u.aes_cmac.tfm =
 405                         ieee80211_aes_cmac_key_setup(key_data);
 406                 if (IS_ERR(key->u.aes_cmac.tfm)) {
 407                         err = PTR_ERR(key->u.aes_cmac.tfm);
 408                         kfree(key);
 409                         return ERR_PTR(err);
 410                 }
 411                 break;
 412         }
 413         memcpy(key->conf.key, key_data, key_len);
 414         INIT_LIST_HEAD(&key->list);
 415
 416         return key;
 417 }
 418
 419 static void __ieee80211_key_destroy(struct ieee80211_key *key)
 420 {
 421         if (!key)
 422                 return;
 423
 424         /*
 425          * Synchronize so the TX path can no longer be using
 426          * this key before we free/remove it.
 427          */
 428         synchronize_rcu();
 429
 430         if (key->local)
 431                 ieee80211_key_disable_hw_accel(key);
 432
 433         if (key->conf.cipher == WLAN_CIPHER_SUITE_CCMP)
 434                 ieee80211_aes_key_free(key->u.ccmp.tfm);
 435         if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC)
 436                 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
 437         if (key->local) {
 438                 ieee80211_debugfs_key_remove(key);
 439                 key->sdata->crypto_tx_tailroom_needed_cnt--;
 440         }
 441
 442         kfree(key);
 443 }
 444
 445 int ieee80211_key_link(struct ieee80211_key *key,
 446                        struct ieee80211_sub_if_data *sdata,
 447                        struct sta_info *sta)
 448 {
 449         struct ieee80211_key *old_key;
 450         int idx, ret;
 451         bool pairwise;
 452
 453         BUG_ON(!sdata);
 454         BUG_ON(!key);
 455
 456         pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
 457         idx = key->conf.keyidx;
 458         key->local = sdata->local;
 459         key->sdata = sdata;
 460         key->sta = sta;
 461
 462         if (sta) {
 463                 /*
 464                  * some hardware cannot handle TKIP with QoS, so
 465                  * we indicate whether QoS could be in use.
 466                  */
 467                 if (test_sta_flags(sta, WLAN_STA_WME))
 468                         key->conf.flags |= IEEE80211_KEY_FLAG_WMM_STA;
 469         } else {
 470                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 471                         struct sta_info *ap;
 472
 473                         /*
 474                          * We're getting a sta pointer in, so must be under
 475                          * appropriate locking for sta_info_get().
 476                          */
 477
 478                         /* same here, the AP could be using QoS */
 479                         ap = sta_info_get(key->sdata, key->sdata->u.mgd.bssid);
 480                         if (ap) {
 481                                 if (test_sta_flags(ap, WLAN_STA_WME))
 482                                         key->conf.flags |=
 483                                                 IEEE80211_KEY_FLAG_WMM_STA;
 484                         }
 485                 }
 486         }
 487
 488         mutex_lock(&sdata->local->key_mtx);
 489
 490         if (sta && pairwise)
 491                 old_key = key_mtx_dereference(sdata->local, sta->ptk);
 492         else if (sta)
 493                 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
 494         else
 495                 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 496
 497         increment_tailroom_need_count(sdata);
 498
 499         __ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
 500         __ieee80211_key_destroy(old_key);
 501
 502         ieee80211_debugfs_key_add(key);
 503
 504         ret = ieee80211_key_enable_hw_accel(key);
 505
 506         mutex_unlock(&sdata->local->key_mtx);
 507
 508         return ret;
 509 }
 510
 511 void __ieee80211_key_free(struct ieee80211_key *key)
 512 {
 513         if (!key)
 514                 return;
 515
 516         /*
 517          * Replace key with nothingness if it was ever used.
 518          */
 519         if (key->sdata)
 520                 __ieee80211_key_replace(key->sdata, key->sta,
 521                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 522                                 key, NULL);
 523         __ieee80211_key_destroy(key);
 524 }
 525
 526 void ieee80211_key_free(struct ieee80211_local *local,
 527                         struct ieee80211_key *key)
 528 {
 529         mutex_lock(&local->key_mtx);
 530         __ieee80211_key_free(key);
 531         mutex_unlock(&local->key_mtx);
 532 }
 533
 534 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
 535 {
 536         struct ieee80211_key *key;
 537
 538         ASSERT_RTNL();
 539
 540         if (WARN_ON(!ieee80211_sdata_running(sdata)))
 541                 return;
 542
 543         mutex_lock(&sdata->local->key_mtx);
 544
 545         sdata->crypto_tx_tailroom_needed_cnt = 0;
 546
 547         list_for_each_entry(key, &sdata->key_list, list) {
 548                 increment_tailroom_need_count(sdata);
 549                 ieee80211_key_enable_hw_accel(key);
 550         }
 551
 552         mutex_unlock(&sdata->local->key_mtx);
 553 }
 554
 555 void ieee80211_iter_keys(struct ieee80211_hw *hw,
 556                          struct ieee80211_vif *vif,
 557                          void (*iter)(struct ieee80211_hw *hw,
 558                                       struct ieee80211_vif *vif,
 559                                       struct ieee80211_sta *sta,
 560                                       struct ieee80211_key_conf *key,
 561                                       void *data),
 562                          void *iter_data)
 563 {
 564         struct ieee80211_local *local = hw_to_local(hw);
 565         struct ieee80211_key *key;
 566         struct ieee80211_sub_if_data *sdata;
 567
 568         ASSERT_RTNL();
 569
 570         mutex_lock(&local->key_mtx);
 571         if (vif) {
 572                 sdata = vif_to_sdata(vif);
 573                 list_for_each_entry(key, &sdata->key_list, list)
 574                         iter(hw, &sdata->vif,
 575                              key->sta ? &key->sta->sta : NULL,
 576                              &key->conf, iter_data);
 577         } else {
 578                 list_for_each_entry(sdata, &local->interfaces, list)
 579                         list_for_each_entry(key, &sdata->key_list, list)
 580                                 iter(hw, &sdata->vif,
 581                                      key->sta ? &key->sta->sta : NULL,
 582                                      &key->conf, iter_data);
 583         }
 584         mutex_unlock(&local->key_mtx);
 585 }
 586 EXPORT_SYMBOL(ieee80211_iter_keys);
 587
 588 void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata)
 589 {
 590         struct ieee80211_key *key;
 591
 592         ASSERT_RTNL();
 593
 594         mutex_lock(&sdata->local->key_mtx);
 595
 596         list_for_each_entry(key, &sdata->key_list, list)
 597                 ieee80211_key_disable_hw_accel(key);
 598
 599         mutex_unlock(&sdata->local->key_mtx);
 600 }
 601
 602 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata)
 603 {
 604         struct ieee80211_key *key, *tmp;
 605
 606         mutex_lock(&sdata->local->key_mtx);
 607
 608         ieee80211_debugfs_key_remove_mgmt_default(sdata);
 609
 610         list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
 611                 __ieee80211_key_free(key);
 612
 613         ieee80211_debugfs_key_update_default(sdata);
 614
 615         mutex_unlock(&sdata->local->key_mtx);
 616 }
 617
 618
 619 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
 620                                 const u8 *replay_ctr, gfp_t gfp)
 621 {
 622         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 623
 624         trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
 625
 626         cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
 627 }
 628 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
 629
 630 void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf,
 631                               struct ieee80211_key_seq *seq)
 632 {
 633         struct ieee80211_key *key;
 634         u64 pn64;
 635
 636         if (WARN_ON(!(keyconf->flags & IEEE80211_KEY_FLAG_GENERATE_IV)))
 637                 return;
 638
 639         key = container_of(keyconf, struct ieee80211_key, conf);
 640
 641         switch (key->conf.cipher) {
 642         case WLAN_CIPHER_SUITE_TKIP:
 643                 seq->tkip.iv32 = key->u.tkip.tx.iv32;
 644                 seq->tkip.iv16 = key->u.tkip.tx.iv16;
 645                 break;
 646         case WLAN_CIPHER_SUITE_CCMP:
 647                 pn64 = atomic64_read(&key->u.ccmp.tx_pn);
 648                 seq->ccmp.pn[5] = pn64;
 649                 seq->ccmp.pn[4] = pn64 >> 8;
 650                 seq->ccmp.pn[3] = pn64 >> 16;
 651                 seq->ccmp.pn[2] = pn64 >> 24;
 652                 seq->ccmp.pn[1] = pn64 >> 32;
 653                 seq->ccmp.pn[0] = pn64 >> 40;
 654                 break;
 655         case WLAN_CIPHER_SUITE_AES_CMAC:
 656                 pn64 = atomic64_read(&key->u.aes_cmac.tx_pn);
 657                 seq->ccmp.pn[5] = pn64;
 658                 seq->ccmp.pn[4] = pn64 >> 8;
 659                 seq->ccmp.pn[3] = pn64 >> 16;
 660                 seq->ccmp.pn[2] = pn64 >> 24;
 661                 seq->ccmp.pn[1] = pn64 >> 32;
 662                 seq->ccmp.pn[0] = pn64 >> 40;
 663                 break;
 664         default:
 665                 WARN_ON(1);
 666         }
 667 }
 668 EXPORT_SYMBOL(ieee80211_get_key_tx_seq);
 669
 670 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
 671                               int tid, struct ieee80211_key_seq *seq)
 672 {
 673         struct ieee80211_key *key;
 674         const u8 *pn;
 675
 676         key = container_of(keyconf, struct ieee80211_key, conf);
 677
 678         switch (key->conf.cipher) {
 679         case WLAN_CIPHER_SUITE_TKIP:
 680                 if (WARN_ON(tid < 0 || tid >= NUM_RX_DATA_QUEUES))
 681                         return;
 682                 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
 683                 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
 684                 break;
 685         case WLAN_CIPHER_SUITE_CCMP:
 686                 if (WARN_ON(tid < -1 || tid >= NUM_RX_DATA_QUEUES))
 687                         return;
 688                 if (tid < 0)
 689                         pn = key->u.ccmp.rx_pn[NUM_RX_DATA_QUEUES];
 690                 else
 691                         pn = key->u.ccmp.rx_pn[tid];
 692                 memcpy(seq->ccmp.pn, pn, CCMP_PN_LEN);
 693                 break;
 694         case WLAN_CIPHER_SUITE_AES_CMAC:
 695                 if (WARN_ON(tid != 0))
 696                         return;
 697                 pn = key->u.aes_cmac.rx_pn;
 698                 memcpy(seq->aes_cmac.pn, pn, CMAC_PN_LEN);
 699                 break;
 700         }
 701 }
 702 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);