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