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 <asm/unaligned.h>
  21 #include "ieee80211_i.h"
  22 #include "driver-ops.h"
  23 #include "debugfs_key.h"
  24 #include "aes_ccm.h"
  25 #include "aes_cmac.h"
  26
  27
  28 /**
  29  * DOC: Key handling basics
  30  *
  31  * Key handling in mac80211 is done based on per-interface (sub_if_data)
  32  * keys and per-station keys. Since each station belongs to an interface,
  33  * each station key also belongs to that interface.
  34  *
  35  * Hardware acceleration is done on a best-effort basis for algorithms
  36  * that are implemented in software,  for each key the hardware is asked
  37  * to enable that key for offloading but if it cannot do that the key is
  38  * simply kept for software encryption (unless it is for an algorithm
  39  * that isn't implemented in software).
  40  * There is currently no way of knowing whether a key is handled in SW
  41  * or HW except by looking into debugfs.
  42  *
  43  * All key management is internally protected by a mutex. Within all
  44  * other parts of mac80211, key references are, just as STA structure
  45  * references, protected by RCU. Note, however, that some things are
  46  * unprotected, namely the key->sta dereferences within the hardware
  47  * acceleration functions. This means that sta_info_destroy() must
  48  * remove the key which waits for an RCU grace period.
  49  */
  50
  51 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
  52
  53 static void assert_key_lock(struct ieee80211_local *local)
  54 {
  55         lockdep_assert_held(&local->key_mtx);
  56 }
  57
  58 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
  59 {
  60         /*
  61          * When this count is zero, SKB resizing for allocating tailroom
  62          * for IV or MMIC is skipped. But, this check has created two race
  63          * cases in xmit path while transiting from zero count to one:
  64          *
  65          * 1. SKB resize was skipped because no key was added but just before
  66          * the xmit key is added and SW encryption kicks off.
  67          *
  68          * 2. SKB resize was skipped because all the keys were hw planted but
  69          * just before xmit one of the key is deleted and SW encryption kicks
  70          * off.
  71          *
  72          * In both the above case SW encryption will find not enough space for
  73          * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
  74          *
  75          * Solution has been explained at
  76          * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
  77          */
  78
  79         if (!sdata->crypto_tx_tailroom_needed_cnt++) {
  80                 /*
  81                  * Flush all XMIT packets currently using HW encryption or no
  82                  * encryption at all if the count transition is from 0 -> 1.
  83                  */
  84                 synchronize_net();
  85         }
  86 }
  87
  88 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
  89 {
  90         struct ieee80211_sub_if_data *sdata;
  91         struct sta_info *sta;
  92         int ret;
  93
  94         might_sleep();
  95
  96         if (!key->local->ops->set_key)
  97                 goto out_unsupported;
  98
  99         assert_key_lock(key->local);
 100
 101         sta = key->sta;
 102
 103         /*
 104          * If this is a per-STA GTK, check if it
 105          * is supported; if not, return.
 106          */
 107         if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) &&
 108             !(key->local->hw.flags & IEEE80211_HW_SUPPORTS_PER_STA_GTK))
 109                 goto out_unsupported;
 110
 111         if (sta && !sta->uploaded)
 112                 goto out_unsupported;
 113
 114         sdata = key->sdata;
 115         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 116                 /*
 117                  * The driver doesn't know anything about VLAN interfaces.
 118                  * Hence, don't send GTKs for VLAN interfaces to the driver.
 119                  */
 120                 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE))
 121                         goto out_unsupported;
 122         }
 123
 124         ret = drv_set_key(key->local, SET_KEY, sdata,
 125                           sta ? &sta->sta : NULL, &key->conf);
 126
 127         if (!ret) {
 128                 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
 129
 130                 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
 131                       (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) ||
 132                       (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)))
 133                         sdata->crypto_tx_tailroom_needed_cnt--;
 134
 135                 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
 136                         (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
 137
 138                 return 0;
 139         }
 140
 141         if (ret != -ENOSPC && ret != -EOPNOTSUPP)
 142                 sdata_err(sdata,
 143                           "failed to set key (%d, %pM) to hardware (%d)\n",
 144                           key->conf.keyidx,
 145                           sta ? 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 sta_info *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 = key->sta;
 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               (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)))
 183                 increment_tailroom_need_count(sdata);
 184
 185         ret = drv_set_key(key->local, DISABLE_KEY, sdata,
 186                           sta ? &sta->sta : NULL, &key->conf);
 187
 188         if (ret)
 189                 sdata_err(sdata,
 190                           "failed to remove key (%d, %pM) from hardware (%d)\n",
 191                           key->conf.keyidx,
 192                           sta ? sta->sta.addr : bcast_addr, ret);
 193
 194         key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 195 }
 196
 197 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
 198                                         int idx, bool uni, bool multi)
 199 {
 200         struct ieee80211_key *key = NULL;
 201
 202         assert_key_lock(sdata->local);
 203
 204         if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
 205                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 206
 207         if (uni)
 208                 rcu_assign_pointer(sdata->default_unicast_key, key);
 209         if (multi)
 210                 rcu_assign_pointer(sdata->default_multicast_key, key);
 211
 212         ieee80211_debugfs_key_update_default(sdata);
 213 }
 214
 215 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
 216                                bool uni, bool multi)
 217 {
 218         mutex_lock(&sdata->local->key_mtx);
 219         __ieee80211_set_default_key(sdata, idx, uni, multi);
 220         mutex_unlock(&sdata->local->key_mtx);
 221 }
 222
 223 static void
 224 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
 225 {
 226         struct ieee80211_key *key = NULL;
 227
 228         assert_key_lock(sdata->local);
 229
 230         if (idx >= NUM_DEFAULT_KEYS &&
 231             idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
 232                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 233
 234         rcu_assign_pointer(sdata->default_mgmt_key, key);
 235
 236         ieee80211_debugfs_key_update_default(sdata);
 237 }
 238
 239 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
 240                                     int idx)
 241 {
 242         mutex_lock(&sdata->local->key_mtx);
 243         __ieee80211_set_default_mgmt_key(sdata, idx);
 244         mutex_unlock(&sdata->local->key_mtx);
 245 }
 246
 247
 248 static void __ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
 249                                     struct sta_info *sta,
 250                                     bool pairwise,
 251                                     struct ieee80211_key *old,
 252                                     struct ieee80211_key *new)
 253 {
 254         int idx;
 255         bool defunikey, defmultikey, defmgmtkey;
 256
 257         if (new)
 258                 list_add_tail(&new->list, &sdata->key_list);
 259
 260         if (sta && pairwise) {
 261                 rcu_assign_pointer(sta->ptk, new);
 262         } else if (sta) {
 263                 if (old)
 264                         idx = old->conf.keyidx;
 265                 else
 266                         idx = new->conf.keyidx;
 267                 rcu_assign_pointer(sta->gtk[idx], new);
 268         } else {
 269                 WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
 270
 271                 if (old)
 272                         idx = old->conf.keyidx;
 273                 else
 274                         idx = new->conf.keyidx;
 275
 276                 defunikey = old &&
 277                         old == key_mtx_dereference(sdata->local,
 278                                                 sdata->default_unicast_key);
 279                 defmultikey = old &&
 280                         old == key_mtx_dereference(sdata->local,
 281                                                 sdata->default_multicast_key);
 282                 defmgmtkey = old &&
 283                         old == key_mtx_dereference(sdata->local,
 284                                                 sdata->default_mgmt_key);
 285
 286                 if (defunikey && !new)
 287                         __ieee80211_set_default_key(sdata, -1, true, false);
 288                 if (defmultikey && !new)
 289                         __ieee80211_set_default_key(sdata, -1, false, true);
 290                 if (defmgmtkey && !new)
 291                         __ieee80211_set_default_mgmt_key(sdata, -1);
 292
 293                 rcu_assign_pointer(sdata->keys[idx], new);
 294                 if (defunikey && new)
 295                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 296                                                     true, false);
 297                 if (defmultikey && new)
 298                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 299                                                     false, true);
 300                 if (defmgmtkey && new)
 301                         __ieee80211_set_default_mgmt_key(sdata,
 302                                                          new->conf.keyidx);
 303         }
 304
 305         if (old)
 306                 list_del(&old->list);
 307 }
 308
 309 struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
 310                                           const u8 *key_data,
 311                                           size_t seq_len, const u8 *seq)
 312 {
 313         struct ieee80211_key *key;
 314         int i, j, err;
 315
 316         BUG_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS);
 317
 318         key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
 319         if (!key)
 320                 return ERR_PTR(-ENOMEM);
 321
 322         /*
 323          * Default to software encryption; we'll later upload the
 324          * key to the hardware if possible.
 325          */
 326         key->conf.flags = 0;
 327         key->flags = 0;
 328
 329         key->conf.cipher = cipher;
 330         key->conf.keyidx = idx;
 331         key->conf.keylen = key_len;
 332         switch (cipher) {
 333         case WLAN_CIPHER_SUITE_WEP40:
 334         case WLAN_CIPHER_SUITE_WEP104:
 335                 key->conf.iv_len = WEP_IV_LEN;
 336                 key->conf.icv_len = WEP_ICV_LEN;
 337                 break;
 338         case WLAN_CIPHER_SUITE_TKIP:
 339                 key->conf.iv_len = TKIP_IV_LEN;
 340                 key->conf.icv_len = TKIP_ICV_LEN;
 341                 if (seq) {
 342                         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
 343                                 key->u.tkip.rx[i].iv32 =
 344                                         get_unaligned_le32(&seq[2]);
 345                                 key->u.tkip.rx[i].iv16 =
 346                                         get_unaligned_le16(seq);
 347                         }
 348                 }
 349                 spin_lock_init(&key->u.tkip.txlock);
 350                 break;
 351         case WLAN_CIPHER_SUITE_CCMP:
 352                 key->conf.iv_len = CCMP_HDR_LEN;
 353                 key->conf.icv_len = CCMP_MIC_LEN;
 354                 if (seq) {
 355                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 356                                 for (j = 0; j < CCMP_PN_LEN; j++)
 357                                         key->u.ccmp.rx_pn[i][j] =
 358                                                 seq[CCMP_PN_LEN - j - 1];
 359                 }
 360                 /*
 361                  * Initialize AES key state here as an optimization so that
 362                  * it does not need to be initialized for every packet.
 363                  */
 364                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(key_data);
 365                 if (IS_ERR(key->u.ccmp.tfm)) {
 366                         err = PTR_ERR(key->u.ccmp.tfm);
 367                         kfree(key);
 368                         return ERR_PTR(err);
 369                 }
 370                 break;
 371         case WLAN_CIPHER_SUITE_AES_CMAC:
 372                 key->conf.iv_len = 0;
 373                 key->conf.icv_len = sizeof(struct ieee80211_mmie);
 374                 if (seq)
 375                         for (j = 0; j < CMAC_PN_LEN; j++)
 376                                 key->u.aes_cmac.rx_pn[j] =
 377                                         seq[CMAC_PN_LEN - j - 1];
 378                 /*
 379                  * Initialize AES key state here as an optimization so that
 380                  * it does not need to be initialized for every packet.
 381                  */
 382                 key->u.aes_cmac.tfm =
 383                         ieee80211_aes_cmac_key_setup(key_data);
 384                 if (IS_ERR(key->u.aes_cmac.tfm)) {
 385                         err = PTR_ERR(key->u.aes_cmac.tfm);
 386                         kfree(key);
 387                         return ERR_PTR(err);
 388                 }
 389                 break;
 390         }
 391         memcpy(key->conf.key, key_data, key_len);
 392         INIT_LIST_HEAD(&key->list);
 393
 394         return key;
 395 }
 396
 397 static void __ieee80211_key_destroy(struct ieee80211_key *key)
 398 {
 399         if (!key)
 400                 return;
 401
 402         /*
 403          * Synchronize so the TX path can no longer be using
 404          * this key before we free/remove it.
 405          */
 406         synchronize_net();
 407
 408         if (key->local)
 409                 ieee80211_key_disable_hw_accel(key);
 410
 411         if (key->conf.cipher == WLAN_CIPHER_SUITE_CCMP)
 412                 ieee80211_aes_key_free(key->u.ccmp.tfm);
 413         if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC)
 414                 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
 415         if (key->local) {
 416                 ieee80211_debugfs_key_remove(key);
 417                 key->sdata->crypto_tx_tailroom_needed_cnt--;
 418         }
 419
 420         kfree(key);
 421 }
 422
 423 int ieee80211_key_link(struct ieee80211_key *key,
 424                        struct ieee80211_sub_if_data *sdata,
 425                        struct sta_info *sta)
 426 {
 427         struct ieee80211_key *old_key;
 428         int idx, ret;
 429         bool pairwise;
 430
 431         BUG_ON(!sdata);
 432         BUG_ON(!key);
 433
 434         pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
 435         idx = key->conf.keyidx;
 436         key->local = sdata->local;
 437         key->sdata = sdata;
 438         key->sta = sta;
 439
 440         if (sta) {
 441                 /*
 442                  * some hardware cannot handle TKIP with QoS, so
 443                  * we indicate whether QoS could be in use.
 444                  */
 445                 if (test_sta_flag(sta, WLAN_STA_WME))
 446                         key->conf.flags |= IEEE80211_KEY_FLAG_WMM_STA;
 447         } else {
 448                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 449                         struct sta_info *ap;
 450
 451                         /*
 452                          * We're getting a sta pointer in, so must be under
 453                          * appropriate locking for sta_info_get().
 454                          */
 455
 456                         /* same here, the AP could be using QoS */
 457                         ap = sta_info_get(key->sdata, key->sdata->u.mgd.bssid);
 458                         if (ap) {
 459                                 if (test_sta_flag(ap, WLAN_STA_WME))
 460                                         key->conf.flags |=
 461                                                 IEEE80211_KEY_FLAG_WMM_STA;
 462                         }
 463                 }
 464         }
 465
 466         mutex_lock(&sdata->local->key_mtx);
 467
 468         if (sta && pairwise)
 469                 old_key = key_mtx_dereference(sdata->local, sta->ptk);
 470         else if (sta)
 471                 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
 472         else
 473                 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 474
 475         increment_tailroom_need_count(sdata);
 476
 477         __ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
 478         __ieee80211_key_destroy(old_key);
 479
 480         ieee80211_debugfs_key_add(key);
 481
 482         ret = ieee80211_key_enable_hw_accel(key);
 483
 484         mutex_unlock(&sdata->local->key_mtx);
 485
 486         return ret;
 487 }
 488
 489 void __ieee80211_key_free(struct ieee80211_key *key)
 490 {
 491         if (!key)
 492                 return;
 493
 494         /*
 495          * Replace key with nothingness if it was ever used.
 496          */
 497         if (key->sdata)
 498                 __ieee80211_key_replace(key->sdata, key->sta,
 499                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 500                                 key, NULL);
 501         __ieee80211_key_destroy(key);
 502 }
 503
 504 void ieee80211_key_free(struct ieee80211_local *local,
 505                         struct ieee80211_key *key)
 506 {
 507         mutex_lock(&local->key_mtx);
 508         __ieee80211_key_free(key);
 509         mutex_unlock(&local->key_mtx);
 510 }
 511
 512 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
 513 {
 514         struct ieee80211_key *key;
 515
 516         ASSERT_RTNL();
 517
 518         if (WARN_ON(!ieee80211_sdata_running(sdata)))
 519                 return;
 520
 521         mutex_lock(&sdata->local->key_mtx);
 522
 523         sdata->crypto_tx_tailroom_needed_cnt = 0;
 524
 525         list_for_each_entry(key, &sdata->key_list, list) {
 526                 increment_tailroom_need_count(sdata);
 527                 ieee80211_key_enable_hw_accel(key);
 528         }
 529
 530         mutex_unlock(&sdata->local->key_mtx);
 531 }
 532
 533 void ieee80211_iter_keys(struct ieee80211_hw *hw,
 534                          struct ieee80211_vif *vif,
 535                          void (*iter)(struct ieee80211_hw *hw,
 536                                       struct ieee80211_vif *vif,
 537                                       struct ieee80211_sta *sta,
 538                                       struct ieee80211_key_conf *key,
 539                                       void *data),
 540                          void *iter_data)
 541 {
 542         struct ieee80211_local *local = hw_to_local(hw);
 543         struct ieee80211_key *key;
 544         struct ieee80211_sub_if_data *sdata;
 545
 546         ASSERT_RTNL();
 547
 548         mutex_lock(&local->key_mtx);
 549         if (vif) {
 550                 sdata = vif_to_sdata(vif);
 551                 list_for_each_entry(key, &sdata->key_list, list)
 552                         iter(hw, &sdata->vif,
 553                              key->sta ? &key->sta->sta : NULL,
 554                              &key->conf, iter_data);
 555         } else {
 556                 list_for_each_entry(sdata, &local->interfaces, list)
 557                         list_for_each_entry(key, &sdata->key_list, list)
 558                                 iter(hw, &sdata->vif,
 559                                      key->sta ? &key->sta->sta : NULL,
 560                                      &key->conf, iter_data);
 561         }
 562         mutex_unlock(&local->key_mtx);
 563 }
 564 EXPORT_SYMBOL(ieee80211_iter_keys);
 565
 566 void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata)
 567 {
 568         struct ieee80211_key *key;
 569
 570         ASSERT_RTNL();
 571
 572         mutex_lock(&sdata->local->key_mtx);
 573
 574         list_for_each_entry(key, &sdata->key_list, list)
 575                 ieee80211_key_disable_hw_accel(key);
 576
 577         mutex_unlock(&sdata->local->key_mtx);
 578 }
 579
 580 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata)
 581 {
 582         struct ieee80211_key *key, *tmp;
 583
 584         mutex_lock(&sdata->local->key_mtx);
 585
 586         ieee80211_debugfs_key_remove_mgmt_default(sdata);
 587
 588         list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
 589                 __ieee80211_key_free(key);
 590
 591         ieee80211_debugfs_key_update_default(sdata);
 592
 593         mutex_unlock(&sdata->local->key_mtx);
 594 }
 595
 596
 597 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
 598                                 const u8 *replay_ctr, gfp_t gfp)
 599 {
 600         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 601
 602         trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
 603
 604         cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
 605 }
 606 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
 607
 608 void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf,
 609                               struct ieee80211_key_seq *seq)
 610 {
 611         struct ieee80211_key *key;
 612         u64 pn64;
 613
 614         if (WARN_ON(!(keyconf->flags & IEEE80211_KEY_FLAG_GENERATE_IV)))
 615                 return;
 616
 617         key = container_of(keyconf, struct ieee80211_key, conf);
 618
 619         switch (key->conf.cipher) {
 620         case WLAN_CIPHER_SUITE_TKIP:
 621                 seq->tkip.iv32 = key->u.tkip.tx.iv32;
 622                 seq->tkip.iv16 = key->u.tkip.tx.iv16;
 623                 break;
 624         case WLAN_CIPHER_SUITE_CCMP:
 625                 pn64 = atomic64_read(&key->u.ccmp.tx_pn);
 626                 seq->ccmp.pn[5] = pn64;
 627                 seq->ccmp.pn[4] = pn64 >> 8;
 628                 seq->ccmp.pn[3] = pn64 >> 16;
 629                 seq->ccmp.pn[2] = pn64 >> 24;
 630                 seq->ccmp.pn[1] = pn64 >> 32;
 631                 seq->ccmp.pn[0] = pn64 >> 40;
 632                 break;
 633         case WLAN_CIPHER_SUITE_AES_CMAC:
 634                 pn64 = atomic64_read(&key->u.aes_cmac.tx_pn);
 635                 seq->ccmp.pn[5] = pn64;
 636                 seq->ccmp.pn[4] = pn64 >> 8;
 637                 seq->ccmp.pn[3] = pn64 >> 16;
 638                 seq->ccmp.pn[2] = pn64 >> 24;
 639                 seq->ccmp.pn[1] = pn64 >> 32;
 640                 seq->ccmp.pn[0] = pn64 >> 40;
 641                 break;
 642         default:
 643                 WARN_ON(1);
 644         }
 645 }
 646 EXPORT_SYMBOL(ieee80211_get_key_tx_seq);
 647
 648 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
 649                               int tid, struct ieee80211_key_seq *seq)
 650 {
 651         struct ieee80211_key *key;
 652         const u8 *pn;
 653
 654         key = container_of(keyconf, struct ieee80211_key, conf);
 655
 656         switch (key->conf.cipher) {
 657         case WLAN_CIPHER_SUITE_TKIP:
 658                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
 659                         return;
 660                 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
 661                 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
 662                 break;
 663         case WLAN_CIPHER_SUITE_CCMP:
 664                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
 665                         return;
 666                 if (tid < 0)
 667                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
 668                 else
 669                         pn = key->u.ccmp.rx_pn[tid];
 670                 memcpy(seq->ccmp.pn, pn, CCMP_PN_LEN);
 671                 break;
 672         case WLAN_CIPHER_SUITE_AES_CMAC:
 673                 if (WARN_ON(tid != 0))
 674                         return;
 675                 pn = key->u.aes_cmac.rx_pn;
 676                 memcpy(seq->aes_cmac.pn, pn, CMAC_PN_LEN);
 677                 break;
 678         }
 679 }
 680 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);