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                 drv_set_default_unicast_key(sdata->local, sdata, idx);
 210         }
 211
 212         if (multi)
 213                 rcu_assign_pointer(sdata->default_multicast_key, key);
 214
 215         ieee80211_debugfs_key_update_default(sdata);
 216 }
 217
 218 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
 219                                bool uni, bool multi)
 220 {
 221         mutex_lock(&sdata->local->key_mtx);
 222         __ieee80211_set_default_key(sdata, idx, uni, multi);
 223         mutex_unlock(&sdata->local->key_mtx);
 224 }
 225
 226 static void
 227 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
 228 {
 229         struct ieee80211_key *key = NULL;
 230
 231         assert_key_lock(sdata->local);
 232
 233         if (idx >= NUM_DEFAULT_KEYS &&
 234             idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
 235                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 236
 237         rcu_assign_pointer(sdata->default_mgmt_key, key);
 238
 239         ieee80211_debugfs_key_update_default(sdata);
 240 }
 241
 242 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
 243                                     int idx)
 244 {
 245         mutex_lock(&sdata->local->key_mtx);
 246         __ieee80211_set_default_mgmt_key(sdata, idx);
 247         mutex_unlock(&sdata->local->key_mtx);
 248 }
 249
 250
 251 static void __ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
 252                                     struct sta_info *sta,
 253                                     bool pairwise,
 254                                     struct ieee80211_key *old,
 255                                     struct ieee80211_key *new)
 256 {
 257         int idx;
 258         bool defunikey, defmultikey, defmgmtkey;
 259
 260         if (new)
 261                 list_add_tail(&new->list, &sdata->key_list);
 262
 263         if (sta && pairwise) {
 264                 rcu_assign_pointer(sta->ptk, new);
 265         } else if (sta) {
 266                 if (old)
 267                         idx = old->conf.keyidx;
 268                 else
 269                         idx = new->conf.keyidx;
 270                 rcu_assign_pointer(sta->gtk[idx], new);
 271         } else {
 272                 WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
 273
 274                 if (old)
 275                         idx = old->conf.keyidx;
 276                 else
 277                         idx = new->conf.keyidx;
 278
 279                 defunikey = old &&
 280                         old == key_mtx_dereference(sdata->local,
 281                                                 sdata->default_unicast_key);
 282                 defmultikey = old &&
 283                         old == key_mtx_dereference(sdata->local,
 284                                                 sdata->default_multicast_key);
 285                 defmgmtkey = old &&
 286                         old == key_mtx_dereference(sdata->local,
 287                                                 sdata->default_mgmt_key);
 288
 289                 if (defunikey && !new)
 290                         __ieee80211_set_default_key(sdata, -1, true, false);
 291                 if (defmultikey && !new)
 292                         __ieee80211_set_default_key(sdata, -1, false, true);
 293                 if (defmgmtkey && !new)
 294                         __ieee80211_set_default_mgmt_key(sdata, -1);
 295
 296                 rcu_assign_pointer(sdata->keys[idx], new);
 297                 if (defunikey && new)
 298                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 299                                                     true, false);
 300                 if (defmultikey && new)
 301                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 302                                                     false, true);
 303                 if (defmgmtkey && new)
 304                         __ieee80211_set_default_mgmt_key(sdata,
 305                                                          new->conf.keyidx);
 306         }
 307
 308         if (old)
 309                 list_del(&old->list);
 310 }
 311
 312 struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
 313                                           const u8 *key_data,
 314                                           size_t seq_len, const u8 *seq)
 315 {
 316         struct ieee80211_key *key;
 317         int i, j, err;
 318
 319         BUG_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS);
 320
 321         key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
 322         if (!key)
 323                 return ERR_PTR(-ENOMEM);
 324
 325         /*
 326          * Default to software encryption; we'll later upload the
 327          * key to the hardware if possible.
 328          */
 329         key->conf.flags = 0;
 330         key->flags = 0;
 331
 332         key->conf.cipher = cipher;
 333         key->conf.keyidx = idx;
 334         key->conf.keylen = key_len;
 335         switch (cipher) {
 336         case WLAN_CIPHER_SUITE_WEP40:
 337         case WLAN_CIPHER_SUITE_WEP104:
 338                 key->conf.iv_len = WEP_IV_LEN;
 339                 key->conf.icv_len = WEP_ICV_LEN;
 340                 break;
 341         case WLAN_CIPHER_SUITE_TKIP:
 342                 key->conf.iv_len = TKIP_IV_LEN;
 343                 key->conf.icv_len = TKIP_ICV_LEN;
 344                 if (seq) {
 345                         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
 346                                 key->u.tkip.rx[i].iv32 =
 347                                         get_unaligned_le32(&seq[2]);
 348                                 key->u.tkip.rx[i].iv16 =
 349                                         get_unaligned_le16(seq);
 350                         }
 351                 }
 352                 spin_lock_init(&key->u.tkip.txlock);
 353                 break;
 354         case WLAN_CIPHER_SUITE_CCMP:
 355                 key->conf.iv_len = CCMP_HDR_LEN;
 356                 key->conf.icv_len = CCMP_MIC_LEN;
 357                 if (seq) {
 358                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 359                                 for (j = 0; j < CCMP_PN_LEN; j++)
 360                                         key->u.ccmp.rx_pn[i][j] =
 361                                                 seq[CCMP_PN_LEN - j - 1];
 362                 }
 363                 /*
 364                  * Initialize AES key state here as an optimization so that
 365                  * it does not need to be initialized for every packet.
 366                  */
 367                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(key_data);
 368                 if (IS_ERR(key->u.ccmp.tfm)) {
 369                         err = PTR_ERR(key->u.ccmp.tfm);
 370                         kfree(key);
 371                         return ERR_PTR(err);
 372                 }
 373                 break;
 374         case WLAN_CIPHER_SUITE_AES_CMAC:
 375                 key->conf.iv_len = 0;
 376                 key->conf.icv_len = sizeof(struct ieee80211_mmie);
 377                 if (seq)
 378                         for (j = 0; j < CMAC_PN_LEN; j++)
 379                                 key->u.aes_cmac.rx_pn[j] =
 380                                         seq[CMAC_PN_LEN - j - 1];
 381                 /*
 382                  * Initialize AES key state here as an optimization so that
 383                  * it does not need to be initialized for every packet.
 384                  */
 385                 key->u.aes_cmac.tfm =
 386                         ieee80211_aes_cmac_key_setup(key_data);
 387                 if (IS_ERR(key->u.aes_cmac.tfm)) {
 388                         err = PTR_ERR(key->u.aes_cmac.tfm);
 389                         kfree(key);
 390                         return ERR_PTR(err);
 391                 }
 392                 break;
 393         }
 394         memcpy(key->conf.key, key_data, key_len);
 395         INIT_LIST_HEAD(&key->list);
 396
 397         return key;
 398 }
 399
 400 static void __ieee80211_key_destroy(struct ieee80211_key *key)
 401 {
 402         if (!key)
 403                 return;
 404
 405         /*
 406          * Synchronize so the TX path can no longer be using
 407          * this key before we free/remove it.
 408          */
 409         synchronize_net();
 410
 411         if (key->local)
 412                 ieee80211_key_disable_hw_accel(key);
 413
 414         if (key->conf.cipher == WLAN_CIPHER_SUITE_CCMP)
 415                 ieee80211_aes_key_free(key->u.ccmp.tfm);
 416         if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC)
 417                 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
 418         if (key->local) {
 419                 ieee80211_debugfs_key_remove(key);
 420                 key->sdata->crypto_tx_tailroom_needed_cnt--;
 421         }
 422
 423         kfree(key);
 424 }
 425
 426 int ieee80211_key_link(struct ieee80211_key *key,
 427                        struct ieee80211_sub_if_data *sdata,
 428                        struct sta_info *sta)
 429 {
 430         struct ieee80211_key *old_key;
 431         int idx, ret;
 432         bool pairwise;
 433
 434         BUG_ON(!sdata);
 435         BUG_ON(!key);
 436
 437         pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
 438         idx = key->conf.keyidx;
 439         key->local = sdata->local;
 440         key->sdata = sdata;
 441         key->sta = sta;
 442
 443         if (sta) {
 444                 /*
 445                  * some hardware cannot handle TKIP with QoS, so
 446                  * we indicate whether QoS could be in use.
 447                  */
 448                 if (test_sta_flag(sta, WLAN_STA_WME))
 449                         key->conf.flags |= IEEE80211_KEY_FLAG_WMM_STA;
 450         } else {
 451                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 452                         struct sta_info *ap;
 453
 454                         /*
 455                          * We're getting a sta pointer in, so must be under
 456                          * appropriate locking for sta_info_get().
 457                          */
 458
 459                         /* same here, the AP could be using QoS */
 460                         ap = sta_info_get(key->sdata, key->sdata->u.mgd.bssid);
 461                         if (ap) {
 462                                 if (test_sta_flag(ap, WLAN_STA_WME))
 463                                         key->conf.flags |=
 464                                                 IEEE80211_KEY_FLAG_WMM_STA;
 465                         }
 466                 }
 467         }
 468
 469         mutex_lock(&sdata->local->key_mtx);
 470
 471         if (sta && pairwise)
 472                 old_key = key_mtx_dereference(sdata->local, sta->ptk);
 473         else if (sta)
 474                 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
 475         else
 476                 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 477
 478         increment_tailroom_need_count(sdata);
 479
 480         __ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
 481         __ieee80211_key_destroy(old_key);
 482
 483         ieee80211_debugfs_key_add(key);
 484
 485         ret = ieee80211_key_enable_hw_accel(key);
 486
 487         mutex_unlock(&sdata->local->key_mtx);
 488
 489         return ret;
 490 }
 491
 492 void __ieee80211_key_free(struct ieee80211_key *key)
 493 {
 494         if (!key)
 495                 return;
 496
 497         /*
 498          * Replace key with nothingness if it was ever used.
 499          */
 500         if (key->sdata)
 501                 __ieee80211_key_replace(key->sdata, key->sta,
 502                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 503                                 key, NULL);
 504         __ieee80211_key_destroy(key);
 505 }
 506
 507 void ieee80211_key_free(struct ieee80211_local *local,
 508                         struct ieee80211_key *key)
 509 {
 510         mutex_lock(&local->key_mtx);
 511         __ieee80211_key_free(key);
 512         mutex_unlock(&local->key_mtx);
 513 }
 514
 515 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
 516 {
 517         struct ieee80211_key *key;
 518
 519         ASSERT_RTNL();
 520
 521         if (WARN_ON(!ieee80211_sdata_running(sdata)))
 522                 return;
 523
 524         mutex_lock(&sdata->local->key_mtx);
 525
 526         sdata->crypto_tx_tailroom_needed_cnt = 0;
 527
 528         list_for_each_entry(key, &sdata->key_list, list) {
 529                 increment_tailroom_need_count(sdata);
 530                 ieee80211_key_enable_hw_accel(key);
 531         }
 532
 533         mutex_unlock(&sdata->local->key_mtx);
 534 }
 535
 536 void ieee80211_iter_keys(struct ieee80211_hw *hw,
 537                          struct ieee80211_vif *vif,
 538                          void (*iter)(struct ieee80211_hw *hw,
 539                                       struct ieee80211_vif *vif,
 540                                       struct ieee80211_sta *sta,
 541                                       struct ieee80211_key_conf *key,
 542                                       void *data),
 543                          void *iter_data)
 544 {
 545         struct ieee80211_local *local = hw_to_local(hw);
 546         struct ieee80211_key *key;
 547         struct ieee80211_sub_if_data *sdata;
 548
 549         ASSERT_RTNL();
 550
 551         mutex_lock(&local->key_mtx);
 552         if (vif) {
 553                 sdata = vif_to_sdata(vif);
 554                 list_for_each_entry(key, &sdata->key_list, list)
 555                         iter(hw, &sdata->vif,
 556                              key->sta ? &key->sta->sta : NULL,
 557                              &key->conf, iter_data);
 558         } else {
 559                 list_for_each_entry(sdata, &local->interfaces, list)
 560                         list_for_each_entry(key, &sdata->key_list, list)
 561                                 iter(hw, &sdata->vif,
 562                                      key->sta ? &key->sta->sta : NULL,
 563                                      &key->conf, iter_data);
 564         }
 565         mutex_unlock(&local->key_mtx);
 566 }
 567 EXPORT_SYMBOL(ieee80211_iter_keys);
 568
 569 void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata)
 570 {
 571         struct ieee80211_key *key;
 572
 573         ASSERT_RTNL();
 574
 575         mutex_lock(&sdata->local->key_mtx);
 576
 577         list_for_each_entry(key, &sdata->key_list, list)
 578                 ieee80211_key_disable_hw_accel(key);
 579
 580         mutex_unlock(&sdata->local->key_mtx);
 581 }
 582
 583 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata)
 584 {
 585         struct ieee80211_key *key, *tmp;
 586
 587         mutex_lock(&sdata->local->key_mtx);
 588
 589         ieee80211_debugfs_key_remove_mgmt_default(sdata);
 590
 591         list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
 592                 __ieee80211_key_free(key);
 593
 594         ieee80211_debugfs_key_update_default(sdata);
 595
 596         mutex_unlock(&sdata->local->key_mtx);
 597 }
 598
 599
 600 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
 601                                 const u8 *replay_ctr, gfp_t gfp)
 602 {
 603         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 604
 605         trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
 606
 607         cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
 608 }
 609 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
 610
 611 void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf,
 612                               struct ieee80211_key_seq *seq)
 613 {
 614         struct ieee80211_key *key;
 615         u64 pn64;
 616
 617         if (WARN_ON(!(keyconf->flags & IEEE80211_KEY_FLAG_GENERATE_IV)))
 618                 return;
 619
 620         key = container_of(keyconf, struct ieee80211_key, conf);
 621
 622         switch (key->conf.cipher) {
 623         case WLAN_CIPHER_SUITE_TKIP:
 624                 seq->tkip.iv32 = key->u.tkip.tx.iv32;
 625                 seq->tkip.iv16 = key->u.tkip.tx.iv16;
 626                 break;
 627         case WLAN_CIPHER_SUITE_CCMP:
 628                 pn64 = atomic64_read(&key->u.ccmp.tx_pn);
 629                 seq->ccmp.pn[5] = pn64;
 630                 seq->ccmp.pn[4] = pn64 >> 8;
 631                 seq->ccmp.pn[3] = pn64 >> 16;
 632                 seq->ccmp.pn[2] = pn64 >> 24;
 633                 seq->ccmp.pn[1] = pn64 >> 32;
 634                 seq->ccmp.pn[0] = pn64 >> 40;
 635                 break;
 636         case WLAN_CIPHER_SUITE_AES_CMAC:
 637                 pn64 = atomic64_read(&key->u.aes_cmac.tx_pn);
 638                 seq->ccmp.pn[5] = pn64;
 639                 seq->ccmp.pn[4] = pn64 >> 8;
 640                 seq->ccmp.pn[3] = pn64 >> 16;
 641                 seq->ccmp.pn[2] = pn64 >> 24;
 642                 seq->ccmp.pn[1] = pn64 >> 32;
 643                 seq->ccmp.pn[0] = pn64 >> 40;
 644                 break;
 645         default:
 646                 WARN_ON(1);
 647         }
 648 }
 649 EXPORT_SYMBOL(ieee80211_get_key_tx_seq);
 650
 651 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
 652                               int tid, struct ieee80211_key_seq *seq)
 653 {
 654         struct ieee80211_key *key;
 655         const u8 *pn;
 656
 657         key = container_of(keyconf, struct ieee80211_key, conf);
 658
 659         switch (key->conf.cipher) {
 660         case WLAN_CIPHER_SUITE_TKIP:
 661                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
 662                         return;
 663                 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
 664                 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
 665                 break;
 666         case WLAN_CIPHER_SUITE_CCMP:
 667                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
 668                         return;
 669                 if (tid < 0)
 670                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
 671                 else
 672                         pn = key->u.ccmp.rx_pn[tid];
 673                 memcpy(seq->ccmp.pn, pn, CCMP_PN_LEN);
 674                 break;
 675         case WLAN_CIPHER_SUITE_AES_CMAC:
 676                 if (WARN_ON(tid != 0))
 677                         return;
 678                 pn = key->u.aes_cmac.rx_pn;
 679                 memcpy(seq->aes_cmac.pn, pn, CMAC_PN_LEN);
 680                 break;
 681         }
 682 }
 683 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);