net/mac80211/key.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2002-2005, Instant802 Networks, Inc.
   4  * Copyright 2005-2006, Devicescape Software, Inc.
   5  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   6  * Copyright 2007-2008  Johannes Berg <johannes@sipsolutions.net>
   7  * Copyright 2013-2014  Intel Mobile Communications GmbH
   8  * Copyright 2015-2017  Intel Deutschland GmbH
   9  * Copyright 2018-2020, 2022-2023  Intel Corporation
  10  */
  11
  12 #include <crypto/utils.h>
  13 #include <linux/if_ether.h>
  14 #include <linux/etherdevice.h>
  15 #include <linux/list.h>
  16 #include <linux/rcupdate.h>
  17 #include <linux/rtnetlink.h>
  18 #include <linux/slab.h>
  19 #include <linux/export.h>
  20 #include <net/mac80211.h>
  21 #include <asm/unaligned.h>
  22 #include "ieee80211_i.h"
  23 #include "driver-ops.h"
  24 #include "debugfs_key.h"
  25 #include "aes_ccm.h"
  26 #include "aes_cmac.h"
  27 #include "aes_gmac.h"
  28 #include "aes_gcm.h"
  29
  30
  31 /**
  32  * DOC: Key handling basics
  33  *
  34  * Key handling in mac80211 is done based on per-interface (sub_if_data)
  35  * keys and per-station keys. Since each station belongs to an interface,
  36  * each station key also belongs to that interface.
  37  *
  38  * Hardware acceleration is done on a best-effort basis for algorithms
  39  * that are implemented in software,  for each key the hardware is asked
  40  * to enable that key for offloading but if it cannot do that the key is
  41  * simply kept for software encryption (unless it is for an algorithm
  42  * that isn't implemented in software).
  43  * There is currently no way of knowing whether a key is handled in SW
  44  * or HW except by looking into debugfs.
  45  *
  46  * All key management is internally protected by a mutex. Within all
  47  * other parts of mac80211, key references are, just as STA structure
  48  * references, protected by RCU. Note, however, that some things are
  49  * unprotected, namely the key->sta dereferences within the hardware
  50  * acceleration functions. This means that sta_info_destroy() must
  51  * remove the key which waits for an RCU grace period.
  52  */
  53
  54 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
  55
  56 static void assert_key_lock(struct ieee80211_local *local)
  57 {
  58         lockdep_assert_held(&local->key_mtx);
  59 }
  60
  61 static void
  62 update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta)
  63 {
  64         struct ieee80211_sub_if_data *vlan;
  65
  66         if (sdata->vif.type != NL80211_IFTYPE_AP)
  67                 return;
  68
  69         /* crypto_tx_tailroom_needed_cnt is protected by this */
  70         assert_key_lock(sdata->local);
  71
  72         rcu_read_lock();
  73
  74         list_for_each_entry_rcu(vlan, &sdata->u.ap.vlans, u.vlan.list)
  75                 vlan->crypto_tx_tailroom_needed_cnt += delta;
  76
  77         rcu_read_unlock();
  78 }
  79
  80 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
  81 {
  82         /*
  83          * When this count is zero, SKB resizing for allocating tailroom
  84          * for IV or MMIC is skipped. But, this check has created two race
  85          * cases in xmit path while transiting from zero count to one:
  86          *
  87          * 1. SKB resize was skipped because no key was added but just before
  88          * the xmit key is added and SW encryption kicks off.
  89          *
  90          * 2. SKB resize was skipped because all the keys were hw planted but
  91          * just before xmit one of the key is deleted and SW encryption kicks
  92          * off.
  93          *
  94          * In both the above case SW encryption will find not enough space for
  95          * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
  96          *
  97          * Solution has been explained at
  98          * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
  99          */
 100
 101         assert_key_lock(sdata->local);
 102
 103         update_vlan_tailroom_need_count(sdata, 1);
 104
 105         if (!sdata->crypto_tx_tailroom_needed_cnt++) {
 106                 /*
 107                  * Flush all XMIT packets currently using HW encryption or no
 108                  * encryption at all if the count transition is from 0 -> 1.
 109                  */
 110                 synchronize_net();
 111         }
 112 }
 113
 114 static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata,
 115                                          int delta)
 116 {
 117         assert_key_lock(sdata->local);
 118
 119         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta);
 120
 121         update_vlan_tailroom_need_count(sdata, -delta);
 122         sdata->crypto_tx_tailroom_needed_cnt -= delta;
 123 }
 124
 125 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
 126 {
 127         struct ieee80211_sub_if_data *sdata = key->sdata;
 128         struct sta_info *sta;
 129         int ret = -EOPNOTSUPP;
 130
 131         might_sleep();
 132
 133         if (key->flags & KEY_FLAG_TAINTED) {
 134                 /* If we get here, it's during resume and the key is
 135                  * tainted so shouldn't be used/programmed any more.
 136                  * However, its flags may still indicate that it was
 137                  * programmed into the device (since we're in resume)
 138                  * so clear that flag now to avoid trying to remove
 139                  * it again later.
 140                  */
 141                 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE &&
 142                     !(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
 143                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
 144                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 145                         increment_tailroom_need_count(sdata);
 146
 147                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 148                 return -EINVAL;
 149         }
 150
 151         if (!key->local->ops->set_key)
 152                 goto out_unsupported;
 153
 154         assert_key_lock(key->local);
 155
 156         sta = key->sta;
 157
 158         /*
 159          * If this is a per-STA GTK, check if it
 160          * is supported; if not, return.
 161          */
 162         if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) &&
 163             !ieee80211_hw_check(&key->local->hw, SUPPORTS_PER_STA_GTK))
 164                 goto out_unsupported;
 165
 166         if (sta && !sta->uploaded)
 167                 goto out_unsupported;
 168
 169         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 170                 /*
 171                  * The driver doesn't know anything about VLAN interfaces.
 172                  * Hence, don't send GTKs for VLAN interfaces to the driver.
 173                  */
 174                 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
 175                         ret = 1;
 176                         goto out_unsupported;
 177                 }
 178         }
 179
 180         if (key->conf.link_id >= 0 && sdata->vif.active_links &&
 181             !(sdata->vif.active_links & BIT(key->conf.link_id)))
 182                 return 0;
 183
 184         ret = drv_set_key(key->local, SET_KEY, sdata,
 185                           sta ? &sta->sta : NULL, &key->conf);
 186
 187         if (!ret) {
 188                 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
 189
 190                 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
 191                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
 192                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 193                         decrease_tailroom_need_count(sdata, 1);
 194
 195                 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
 196                         (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
 197
 198                 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) &&
 199                         (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC));
 200
 201                 return 0;
 202         }
 203
 204         if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1)
 205                 sdata_err(sdata,
 206                           "failed to set key (%d, %pM) to hardware (%d)\n",
 207                           key->conf.keyidx,
 208                           sta ? sta->sta.addr : bcast_addr, ret);
 209
 210  out_unsupported:
 211         switch (key->conf.cipher) {
 212         case WLAN_CIPHER_SUITE_WEP40:
 213         case WLAN_CIPHER_SUITE_WEP104:
 214         case WLAN_CIPHER_SUITE_TKIP:
 215         case WLAN_CIPHER_SUITE_CCMP:
 216         case WLAN_CIPHER_SUITE_CCMP_256:
 217         case WLAN_CIPHER_SUITE_GCMP:
 218         case WLAN_CIPHER_SUITE_GCMP_256:
 219         case WLAN_CIPHER_SUITE_AES_CMAC:
 220         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 221         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 222         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 223                 /* all of these we can do in software - if driver can */
 224                 if (ret == 1)
 225                         return 0;
 226                 if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL))
 227                         return -EINVAL;
 228                 return 0;
 229         default:
 230                 return -EINVAL;
 231         }
 232 }
 233
 234 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
 235 {
 236         struct ieee80211_sub_if_data *sdata;
 237         struct sta_info *sta;
 238         int ret;
 239
 240         might_sleep();
 241
 242         if (!key || !key->local->ops->set_key)
 243                 return;
 244
 245         assert_key_lock(key->local);
 246
 247         if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 248                 return;
 249
 250         sta = key->sta;
 251         sdata = key->sdata;
 252
 253         if (key->conf.link_id >= 0 && sdata->vif.active_links &&
 254             !(sdata->vif.active_links & BIT(key->conf.link_id)))
 255                 return;
 256
 257         if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
 258                                  IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
 259                                  IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 260                 increment_tailroom_need_count(sdata);
 261
 262         key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 263         ret = drv_set_key(key->local, DISABLE_KEY, sdata,
 264                           sta ? &sta->sta : NULL, &key->conf);
 265
 266         if (ret)
 267                 sdata_err(sdata,
 268                           "failed to remove key (%d, %pM) from hardware (%d)\n",
 269                           key->conf.keyidx,
 270                           sta ? sta->sta.addr : bcast_addr, ret);
 271 }
 272
 273 static int _ieee80211_set_tx_key(struct ieee80211_key *key, bool force)
 274 {
 275         struct sta_info *sta = key->sta;
 276         struct ieee80211_local *local = key->local;
 277
 278         assert_key_lock(local);
 279
 280         set_sta_flag(sta, WLAN_STA_USES_ENCRYPTION);
 281
 282         sta->ptk_idx = key->conf.keyidx;
 283
 284         if (force || !ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT))
 285                 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
 286         ieee80211_check_fast_xmit(sta);
 287
 288         return 0;
 289 }
 290
 291 int ieee80211_set_tx_key(struct ieee80211_key *key)
 292 {
 293         return _ieee80211_set_tx_key(key, false);
 294 }
 295
 296 static void ieee80211_pairwise_rekey(struct ieee80211_key *old,
 297                                      struct ieee80211_key *new)
 298 {
 299         struct ieee80211_local *local = new->local;
 300         struct sta_info *sta = new->sta;
 301         int i;
 302
 303         assert_key_lock(local);
 304
 305         if (new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX) {
 306                 /* Extended Key ID key install, initial one or rekey */
 307
 308                 if (sta->ptk_idx != INVALID_PTK_KEYIDX &&
 309                     !ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT)) {
 310                         /* Aggregation Sessions with Extended Key ID must not
 311                          * mix MPDUs with different keyIDs within one A-MPDU.
 312                          * Tear down running Tx aggregation sessions and block
 313                          * new Rx/Tx aggregation requests during rekey to
 314                          * ensure there are no A-MPDUs when the driver is not
 315                          * supporting A-MPDU key borders. (Blocking Tx only
 316                          * would be sufficient but WLAN_STA_BLOCK_BA gets the
 317                          * job done for the few ms we need it.)
 318                          */
 319                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
 320                         mutex_lock(&sta->ampdu_mlme.mtx);
 321                         for (i = 0; i <  IEEE80211_NUM_TIDS; i++)
 322                                 ___ieee80211_stop_tx_ba_session(sta, i,
 323                                                                 AGG_STOP_LOCAL_REQUEST);
 324                         mutex_unlock(&sta->ampdu_mlme.mtx);
 325                 }
 326         } else if (old) {
 327                 /* Rekey without Extended Key ID.
 328                  * Aggregation sessions are OK when running on SW crypto.
 329                  * A broken remote STA may cause issues not observed with HW
 330                  * crypto, though.
 331                  */
 332                 if (!(old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 333                         return;
 334
 335                 /* Stop Tx till we are on the new key */
 336                 old->flags |= KEY_FLAG_TAINTED;
 337                 ieee80211_clear_fast_xmit(sta);
 338                 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
 339                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
 340                         ieee80211_sta_tear_down_BA_sessions(sta,
 341                                                             AGG_STOP_LOCAL_REQUEST);
 342                 }
 343                 if (!wiphy_ext_feature_isset(local->hw.wiphy,
 344                                              NL80211_EXT_FEATURE_CAN_REPLACE_PTK0)) {
 345                         pr_warn_ratelimited("Rekeying PTK for STA %pM but driver can't safely do that.",
 346                                             sta->sta.addr);
 347                         /* Flushing the driver queues *may* help prevent
 348                          * the clear text leaks and freezes.
 349                          */
 350                         ieee80211_flush_queues(local, old->sdata, false);
 351                 }
 352         }
 353 }
 354
 355 static void __ieee80211_set_default_key(struct ieee80211_link_data *link,
 356                                         int idx, bool uni, bool multi)
 357 {
 358         struct ieee80211_sub_if_data *sdata = link->sdata;
 359         struct ieee80211_key *key = NULL;
 360
 361         assert_key_lock(sdata->local);
 362
 363         if (idx >= 0 && idx < NUM_DEFAULT_KEYS) {
 364                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 365                 if (!key)
 366                         key = key_mtx_dereference(sdata->local, link->gtk[idx]);
 367         }
 368
 369         if (uni) {
 370                 rcu_assign_pointer(sdata->default_unicast_key, key);
 371                 ieee80211_check_fast_xmit_iface(sdata);
 372                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
 373                         drv_set_default_unicast_key(sdata->local, sdata, idx);
 374         }
 375
 376         if (multi)
 377                 rcu_assign_pointer(link->default_multicast_key, key);
 378
 379         ieee80211_debugfs_key_update_default(sdata);
 380 }
 381
 382 void ieee80211_set_default_key(struct ieee80211_link_data *link, int idx,
 383                                bool uni, bool multi)
 384 {
 385         mutex_lock(&link->sdata->local->key_mtx);
 386         __ieee80211_set_default_key(link, idx, uni, multi);
 387         mutex_unlock(&link->sdata->local->key_mtx);
 388 }
 389
 390 static void
 391 __ieee80211_set_default_mgmt_key(struct ieee80211_link_data *link, int idx)
 392 {
 393         struct ieee80211_sub_if_data *sdata = link->sdata;
 394         struct ieee80211_key *key = NULL;
 395
 396         assert_key_lock(sdata->local);
 397
 398         if (idx >= NUM_DEFAULT_KEYS &&
 399             idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
 400                 key = key_mtx_dereference(sdata->local, link->gtk[idx]);
 401
 402         rcu_assign_pointer(link->default_mgmt_key, key);
 403
 404         ieee80211_debugfs_key_update_default(sdata);
 405 }
 406
 407 void ieee80211_set_default_mgmt_key(struct ieee80211_link_data *link,
 408                                     int idx)
 409 {
 410         mutex_lock(&link->sdata->local->key_mtx);
 411         __ieee80211_set_default_mgmt_key(link, idx);
 412         mutex_unlock(&link->sdata->local->key_mtx);
 413 }
 414
 415 static void
 416 __ieee80211_set_default_beacon_key(struct ieee80211_link_data *link, int idx)
 417 {
 418         struct ieee80211_sub_if_data *sdata = link->sdata;
 419         struct ieee80211_key *key = NULL;
 420
 421         assert_key_lock(sdata->local);
 422
 423         if (idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS &&
 424             idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
 425             NUM_DEFAULT_BEACON_KEYS)
 426                 key = key_mtx_dereference(sdata->local, link->gtk[idx]);
 427
 428         rcu_assign_pointer(link->default_beacon_key, key);
 429
 430         ieee80211_debugfs_key_update_default(sdata);
 431 }
 432
 433 void ieee80211_set_default_beacon_key(struct ieee80211_link_data *link,
 434                                       int idx)
 435 {
 436         mutex_lock(&link->sdata->local->key_mtx);
 437         __ieee80211_set_default_beacon_key(link, idx);
 438         mutex_unlock(&link->sdata->local->key_mtx);
 439 }
 440
 441 static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
 442                                  struct ieee80211_link_data *link,
 443                                  struct sta_info *sta,
 444                                  bool pairwise,
 445                                  struct ieee80211_key *old,
 446                                  struct ieee80211_key *new)
 447 {
 448         struct link_sta_info *link_sta = sta ? &sta->deflink : NULL;
 449         int link_id;
 450         int idx;
 451         int ret = 0;
 452         bool defunikey, defmultikey, defmgmtkey, defbeaconkey;
 453         bool is_wep;
 454
 455         /* caller must provide at least one old/new */
 456         if (WARN_ON(!new && !old))
 457                 return 0;
 458
 459         if (new) {
 460                 idx = new->conf.keyidx;
 461                 is_wep = new->conf.cipher == WLAN_CIPHER_SUITE_WEP40 ||
 462                          new->conf.cipher == WLAN_CIPHER_SUITE_WEP104;
 463                 link_id = new->conf.link_id;
 464         } else {
 465                 idx = old->conf.keyidx;
 466                 is_wep = old->conf.cipher == WLAN_CIPHER_SUITE_WEP40 ||
 467                          old->conf.cipher == WLAN_CIPHER_SUITE_WEP104;
 468                 link_id = old->conf.link_id;
 469         }
 470
 471         if (WARN(old && old->conf.link_id != link_id,
 472                  "old link ID %d doesn't match new link ID %d\n",
 473                  old->conf.link_id, link_id))
 474                 return -EINVAL;
 475
 476         if (link_id >= 0) {
 477                 if (!link) {
 478                         link = sdata_dereference(sdata->link[link_id], sdata);
 479                         if (!link)
 480                                 return -ENOLINK;
 481                 }
 482
 483                 if (sta) {
 484                         link_sta = rcu_dereference_protected(sta->link[link_id],
 485                                                              lockdep_is_held(&sta->local->sta_mtx));
 486                         if (!link_sta)
 487                                 return -ENOLINK;
 488                 }
 489         } else {
 490                 link = &sdata->deflink;
 491         }
 492
 493         if ((is_wep || pairwise) && idx >= NUM_DEFAULT_KEYS)
 494                 return -EINVAL;
 495
 496         WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
 497
 498         if (new && sta && pairwise) {
 499                 /* Unicast rekey needs special handling. With Extended Key ID
 500                  * old is still NULL for the first rekey.
 501                  */
 502                 ieee80211_pairwise_rekey(old, new);
 503         }
 504
 505         if (old) {
 506                 if (old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
 507                         ieee80211_key_disable_hw_accel(old);
 508
 509                         if (new)
 510                                 ret = ieee80211_key_enable_hw_accel(new);
 511                 }
 512         } else {
 513                 if (!new->local->wowlan) {
 514                         ret = ieee80211_key_enable_hw_accel(new);
 515                 } else {
 516                         assert_key_lock(new->local);
 517                         new->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
 518                 }
 519         }
 520
 521         if (ret)
 522                 return ret;
 523
 524         if (new)
 525                 list_add_tail_rcu(&new->list, &sdata->key_list);
 526
 527         if (sta) {
 528                 if (pairwise) {
 529                         rcu_assign_pointer(sta->ptk[idx], new);
 530                         if (new &&
 531                             !(new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX))
 532                                 _ieee80211_set_tx_key(new, true);
 533                 } else {
 534                         rcu_assign_pointer(link_sta->gtk[idx], new);
 535                 }
 536                 /* Only needed for transition from no key -> key.
 537                  * Still triggers unnecessary when using Extended Key ID
 538                  * and installing the second key ID the first time.
 539                  */
 540                 if (new && !old)
 541                         ieee80211_check_fast_rx(sta);
 542         } else {
 543                 defunikey = old &&
 544                         old == key_mtx_dereference(sdata->local,
 545                                                 sdata->default_unicast_key);
 546                 defmultikey = old &&
 547                         old == key_mtx_dereference(sdata->local,
 548                                                    link->default_multicast_key);
 549                 defmgmtkey = old &&
 550                         old == key_mtx_dereference(sdata->local,
 551                                                    link->default_mgmt_key);
 552                 defbeaconkey = old &&
 553                         old == key_mtx_dereference(sdata->local,
 554                                                    link->default_beacon_key);
 555
 556                 if (defunikey && !new)
 557                         __ieee80211_set_default_key(link, -1, true, false);
 558                 if (defmultikey && !new)
 559                         __ieee80211_set_default_key(link, -1, false, true);
 560                 if (defmgmtkey && !new)
 561                         __ieee80211_set_default_mgmt_key(link, -1);
 562                 if (defbeaconkey && !new)
 563                         __ieee80211_set_default_beacon_key(link, -1);
 564
 565                 if (is_wep || pairwise)
 566                         rcu_assign_pointer(sdata->keys[idx], new);
 567                 else
 568                         rcu_assign_pointer(link->gtk[idx], new);
 569
 570                 if (defunikey && new)
 571                         __ieee80211_set_default_key(link, new->conf.keyidx,
 572                                                     true, false);
 573                 if (defmultikey && new)
 574                         __ieee80211_set_default_key(link, new->conf.keyidx,
 575                                                     false, true);
 576                 if (defmgmtkey && new)
 577                         __ieee80211_set_default_mgmt_key(link,
 578                                                          new->conf.keyidx);
 579                 if (defbeaconkey && new)
 580                         __ieee80211_set_default_beacon_key(link,
 581                                                            new->conf.keyidx);
 582         }
 583
 584         if (old)
 585                 list_del_rcu(&old->list);
 586
 587         return 0;
 588 }
 589
 590 struct ieee80211_key *
 591 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
 592                     const u8 *key_data,
 593                     size_t seq_len, const u8 *seq)
 594 {
 595         struct ieee80211_key *key;
 596         int i, j, err;
 597
 598         if (WARN_ON(idx < 0 ||
 599                     idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
 600                     NUM_DEFAULT_BEACON_KEYS))
 601                 return ERR_PTR(-EINVAL);
 602
 603         key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
 604         if (!key)
 605                 return ERR_PTR(-ENOMEM);
 606
 607         /*
 608          * Default to software encryption; we'll later upload the
 609          * key to the hardware if possible.
 610          */
 611         key->conf.flags = 0;
 612         key->flags = 0;
 613
 614         key->conf.link_id = -1;
 615         key->conf.cipher = cipher;
 616         key->conf.keyidx = idx;
 617         key->conf.keylen = key_len;
 618         switch (cipher) {
 619         case WLAN_CIPHER_SUITE_WEP40:
 620         case WLAN_CIPHER_SUITE_WEP104:
 621                 key->conf.iv_len = IEEE80211_WEP_IV_LEN;
 622                 key->conf.icv_len = IEEE80211_WEP_ICV_LEN;
 623                 break;
 624         case WLAN_CIPHER_SUITE_TKIP:
 625                 key->conf.iv_len = IEEE80211_TKIP_IV_LEN;
 626                 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN;
 627                 if (seq) {
 628                         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
 629                                 key->u.tkip.rx[i].iv32 =
 630                                         get_unaligned_le32(&seq[2]);
 631                                 key->u.tkip.rx[i].iv16 =
 632                                         get_unaligned_le16(seq);
 633                         }
 634                 }
 635                 spin_lock_init(&key->u.tkip.txlock);
 636                 break;
 637         case WLAN_CIPHER_SUITE_CCMP:
 638                 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN;
 639                 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN;
 640                 if (seq) {
 641                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 642                                 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++)
 643                                         key->u.ccmp.rx_pn[i][j] =
 644                                                 seq[IEEE80211_CCMP_PN_LEN - j - 1];
 645                 }
 646                 /*
 647                  * Initialize AES key state here as an optimization so that
 648                  * it does not need to be initialized for every packet.
 649                  */
 650                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 651                         key_data, key_len, IEEE80211_CCMP_MIC_LEN);
 652                 if (IS_ERR(key->u.ccmp.tfm)) {
 653                         err = PTR_ERR(key->u.ccmp.tfm);
 654                         kfree(key);
 655                         return ERR_PTR(err);
 656                 }
 657                 break;
 658         case WLAN_CIPHER_SUITE_CCMP_256:
 659                 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN;
 660                 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN;
 661                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 662                         for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++)
 663                                 key->u.ccmp.rx_pn[i][j] =
 664                                         seq[IEEE80211_CCMP_256_PN_LEN - j - 1];
 665                 /* Initialize AES key state here as an optimization so that
 666                  * it does not need to be initialized for every packet.
 667                  */
 668                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 669                         key_data, key_len, IEEE80211_CCMP_256_MIC_LEN);
 670                 if (IS_ERR(key->u.ccmp.tfm)) {
 671                         err = PTR_ERR(key->u.ccmp.tfm);
 672                         kfree(key);
 673                         return ERR_PTR(err);
 674                 }
 675                 break;
 676         case WLAN_CIPHER_SUITE_AES_CMAC:
 677         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 678                 key->conf.iv_len = 0;
 679                 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
 680                         key->conf.icv_len = sizeof(struct ieee80211_mmie);
 681                 else
 682                         key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 683                 if (seq)
 684                         for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
 685                                 key->u.aes_cmac.rx_pn[j] =
 686                                         seq[IEEE80211_CMAC_PN_LEN - j - 1];
 687                 /*
 688                  * Initialize AES key state here as an optimization so that
 689                  * it does not need to be initialized for every packet.
 690                  */
 691                 key->u.aes_cmac.tfm =
 692                         ieee80211_aes_cmac_key_setup(key_data, key_len);
 693                 if (IS_ERR(key->u.aes_cmac.tfm)) {
 694                         err = PTR_ERR(key->u.aes_cmac.tfm);
 695                         kfree(key);
 696                         return ERR_PTR(err);
 697                 }
 698                 break;
 699         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 700         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 701                 key->conf.iv_len = 0;
 702                 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 703                 if (seq)
 704                         for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++)
 705                                 key->u.aes_gmac.rx_pn[j] =
 706                                         seq[IEEE80211_GMAC_PN_LEN - j - 1];
 707                 /* Initialize AES key state here as an optimization so that
 708                  * it does not need to be initialized for every packet.
 709                  */
 710                 key->u.aes_gmac.tfm =
 711                         ieee80211_aes_gmac_key_setup(key_data, key_len);
 712                 if (IS_ERR(key->u.aes_gmac.tfm)) {
 713                         err = PTR_ERR(key->u.aes_gmac.tfm);
 714                         kfree(key);
 715                         return ERR_PTR(err);
 716                 }
 717                 break;
 718         case WLAN_CIPHER_SUITE_GCMP:
 719         case WLAN_CIPHER_SUITE_GCMP_256:
 720                 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
 721                 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
 722                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 723                         for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
 724                                 key->u.gcmp.rx_pn[i][j] =
 725                                         seq[IEEE80211_GCMP_PN_LEN - j - 1];
 726                 /* Initialize AES key state here as an optimization so that
 727                  * it does not need to be initialized for every packet.
 728                  */
 729                 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
 730                                                                       key_len);
 731                 if (IS_ERR(key->u.gcmp.tfm)) {
 732                         err = PTR_ERR(key->u.gcmp.tfm);
 733                         kfree(key);
 734                         return ERR_PTR(err);
 735                 }
 736                 break;
 737         }
 738         memcpy(key->conf.key, key_data, key_len);
 739         INIT_LIST_HEAD(&key->list);
 740
 741         return key;
 742 }
 743
 744 static void ieee80211_key_free_common(struct ieee80211_key *key)
 745 {
 746         switch (key->conf.cipher) {
 747         case WLAN_CIPHER_SUITE_CCMP:
 748         case WLAN_CIPHER_SUITE_CCMP_256:
 749                 ieee80211_aes_key_free(key->u.ccmp.tfm);
 750                 break;
 751         case WLAN_CIPHER_SUITE_AES_CMAC:
 752         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 753                 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
 754                 break;
 755         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 756         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 757                 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm);
 758                 break;
 759         case WLAN_CIPHER_SUITE_GCMP:
 760         case WLAN_CIPHER_SUITE_GCMP_256:
 761                 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
 762                 break;
 763         }
 764         kfree_sensitive(key);
 765 }
 766
 767 static void __ieee80211_key_destroy(struct ieee80211_key *key,
 768                                     bool delay_tailroom)
 769 {
 770         if (key->local) {
 771                 struct ieee80211_sub_if_data *sdata = key->sdata;
 772
 773                 ieee80211_debugfs_key_remove(key);
 774
 775                 if (delay_tailroom) {
 776                         /* see ieee80211_delayed_tailroom_dec */
 777                         sdata->crypto_tx_tailroom_pending_dec++;
 778                         schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
 779                                               HZ/2);
 780                 } else {
 781                         decrease_tailroom_need_count(sdata, 1);
 782                 }
 783         }
 784
 785         ieee80211_key_free_common(key);
 786 }
 787
 788 static void ieee80211_key_destroy(struct ieee80211_key *key,
 789                                   bool delay_tailroom)
 790 {
 791         if (!key)
 792                 return;
 793
 794         /*
 795          * Synchronize so the TX path and rcu key iterators
 796          * can no longer be using this key before we free/remove it.
 797          */
 798         synchronize_net();
 799
 800         __ieee80211_key_destroy(key, delay_tailroom);
 801 }
 802
 803 void ieee80211_key_free_unused(struct ieee80211_key *key)
 804 {
 805         WARN_ON(key->sdata || key->local);
 806         ieee80211_key_free_common(key);
 807 }
 808
 809 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata,
 810                                     struct ieee80211_key *old,
 811                                     struct ieee80211_key *new)
 812 {
 813         u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP];
 814         u8 *tk_old, *tk_new;
 815
 816         if (!old || new->conf.keylen != old->conf.keylen)
 817                 return false;
 818
 819         tk_old = old->conf.key;
 820         tk_new = new->conf.key;
 821
 822         /*
 823          * In station mode, don't compare the TX MIC key, as it's never used
 824          * and offloaded rekeying may not care to send it to the host. This
 825          * is the case in iwlwifi, for example.
 826          */
 827         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 828             new->conf.cipher == WLAN_CIPHER_SUITE_TKIP &&
 829             new->conf.keylen == WLAN_KEY_LEN_TKIP &&
 830             !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
 831                 memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP);
 832                 memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP);
 833                 memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 834                 memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 835                 tk_old = tkip_old;
 836                 tk_new = tkip_new;
 837         }
 838
 839         return !crypto_memneq(tk_old, tk_new, new->conf.keylen);
 840 }
 841
 842 int ieee80211_key_link(struct ieee80211_key *key,
 843                        struct ieee80211_link_data *link,
 844                        struct sta_info *sta)
 845 {
 846         struct ieee80211_sub_if_data *sdata = link->sdata;
 847         static atomic_t key_color = ATOMIC_INIT(0);
 848         struct ieee80211_key *old_key = NULL;
 849         int idx = key->conf.keyidx;
 850         bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
 851         /*
 852          * We want to delay tailroom updates only for station - in that
 853          * case it helps roaming speed, but in other cases it hurts and
 854          * can cause warnings to appear.
 855          */
 856         bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION;
 857         int ret = -EOPNOTSUPP;
 858
 859         mutex_lock(&sdata->local->key_mtx);
 860
 861         if (sta && pairwise) {
 862                 struct ieee80211_key *alt_key;
 863
 864                 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
 865                 alt_key = key_mtx_dereference(sdata->local, sta->ptk[idx ^ 1]);
 866
 867                 /* The rekey code assumes that the old and new key are using
 868                  * the same cipher. Enforce the assumption for pairwise keys.
 869                  */
 870                 if ((alt_key && alt_key->conf.cipher != key->conf.cipher) ||
 871                     (old_key && old_key->conf.cipher != key->conf.cipher))
 872                         goto out;
 873         } else if (sta) {
 874                 struct link_sta_info *link_sta = &sta->deflink;
 875                 int link_id = key->conf.link_id;
 876
 877                 if (link_id >= 0) {
 878                         link_sta = rcu_dereference_protected(sta->link[link_id],
 879                                                              lockdep_is_held(&sta->local->sta_mtx));
 880                         if (!link_sta) {
 881                                 ret = -ENOLINK;
 882                                 goto out;
 883                         }
 884                 }
 885
 886                 old_key = key_mtx_dereference(sdata->local, link_sta->gtk[idx]);
 887         } else {
 888                 if (idx < NUM_DEFAULT_KEYS)
 889                         old_key = key_mtx_dereference(sdata->local,
 890                                                       sdata->keys[idx]);
 891                 if (!old_key)
 892                         old_key = key_mtx_dereference(sdata->local,
 893                                                       link->gtk[idx]);
 894         }
 895
 896         /* Non-pairwise keys must also not switch the cipher on rekey */
 897         if (!pairwise) {
 898                 if (old_key && old_key->conf.cipher != key->conf.cipher)
 899                         goto out;
 900         }
 901
 902         /*
 903          * Silently accept key re-installation without really installing the
 904          * new version of the key to avoid nonce reuse or replay issues.
 905          */
 906         if (ieee80211_key_identical(sdata, old_key, key)) {
 907                 ieee80211_key_free_unused(key);
 908                 ret = 0;
 909                 goto out;
 910         }
 911
 912         key->local = sdata->local;
 913         key->sdata = sdata;
 914         key->sta = sta;
 915
 916         /*
 917          * Assign a unique ID to every key so we can easily prevent mixed
 918          * key and fragment cache attacks.
 919          */
 920         key->color = atomic_inc_return(&key_color);
 921
 922         increment_tailroom_need_count(sdata);
 923
 924         ret = ieee80211_key_replace(sdata, link, sta, pairwise, old_key, key);
 925
 926         if (!ret) {
 927                 ieee80211_debugfs_key_add(key);
 928                 ieee80211_key_destroy(old_key, delay_tailroom);
 929         } else {
 930                 ieee80211_key_free(key, delay_tailroom);
 931         }
 932
 933  out:
 934         mutex_unlock(&sdata->local->key_mtx);
 935
 936         return ret;
 937 }
 938
 939 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
 940 {
 941         if (!key)
 942                 return;
 943
 944         /*
 945          * Replace key with nothingness if it was ever used.
 946          */
 947         if (key->sdata)
 948                 ieee80211_key_replace(key->sdata, NULL, key->sta,
 949                                       key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 950                                       key, NULL);
 951         ieee80211_key_destroy(key, delay_tailroom);
 952 }
 953
 954 void ieee80211_reenable_keys(struct ieee80211_sub_if_data *sdata)
 955 {
 956         struct ieee80211_key *key;
 957         struct ieee80211_sub_if_data *vlan;
 958
 959         lockdep_assert_wiphy(sdata->local->hw.wiphy);
 960
 961         mutex_lock(&sdata->local->key_mtx);
 962
 963         sdata->crypto_tx_tailroom_needed_cnt = 0;
 964         sdata->crypto_tx_tailroom_pending_dec = 0;
 965
 966         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 967                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
 968                         vlan->crypto_tx_tailroom_needed_cnt = 0;
 969                         vlan->crypto_tx_tailroom_pending_dec = 0;
 970                 }
 971         }
 972
 973         if (ieee80211_sdata_running(sdata)) {
 974                 list_for_each_entry(key, &sdata->key_list, list) {
 975                         increment_tailroom_need_count(sdata);
 976                         ieee80211_key_enable_hw_accel(key);
 977                 }
 978         }
 979
 980         mutex_unlock(&sdata->local->key_mtx);
 981 }
 982
 983 void ieee80211_iter_keys(struct ieee80211_hw *hw,
 984                          struct ieee80211_vif *vif,
 985                          void (*iter)(struct ieee80211_hw *hw,
 986                                       struct ieee80211_vif *vif,
 987                                       struct ieee80211_sta *sta,
 988                                       struct ieee80211_key_conf *key,
 989                                       void *data),
 990                          void *iter_data)
 991 {
 992         struct ieee80211_local *local = hw_to_local(hw);
 993         struct ieee80211_key *key, *tmp;
 994         struct ieee80211_sub_if_data *sdata;
 995
 996         lockdep_assert_wiphy(hw->wiphy);
 997
 998         mutex_lock(&local->key_mtx);
 999         if (vif) {
1000                 sdata = vif_to_sdata(vif);
1001                 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
1002                         iter(hw, &sdata->vif,
1003                              key->sta ? &key->sta->sta : NULL,
1004                              &key->conf, iter_data);
1005         } else {
1006                 list_for_each_entry(sdata, &local->interfaces, list)
1007                         list_for_each_entry_safe(key, tmp,
1008                                                  &sdata->key_list, list)
1009                                 iter(hw, &sdata->vif,
1010                                      key->sta ? &key->sta->sta : NULL,
1011                                      &key->conf, iter_data);
1012         }
1013         mutex_unlock(&local->key_mtx);
1014 }
1015 EXPORT_SYMBOL(ieee80211_iter_keys);
1016
1017 static void
1018 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
1019                          struct ieee80211_sub_if_data *sdata,
1020                          void (*iter)(struct ieee80211_hw *hw,
1021                                       struct ieee80211_vif *vif,
1022                                       struct ieee80211_sta *sta,
1023                                       struct ieee80211_key_conf *key,
1024                                       void *data),
1025                          void *iter_data)
1026 {
1027         struct ieee80211_key *key;
1028
1029         list_for_each_entry_rcu(key, &sdata->key_list, list) {
1030                 /* skip keys of station in removal process */
1031                 if (key->sta && key->sta->removed)
1032                         continue;
1033                 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1034                         continue;
1035
1036                 iter(hw, &sdata->vif,
1037                      key->sta ? &key->sta->sta : NULL,
1038                      &key->conf, iter_data);
1039         }
1040 }
1041
1042 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
1043                              struct ieee80211_vif *vif,
1044                              void (*iter)(struct ieee80211_hw *hw,
1045                                           struct ieee80211_vif *vif,
1046                                           struct ieee80211_sta *sta,
1047                                           struct ieee80211_key_conf *key,
1048                                           void *data),
1049                              void *iter_data)
1050 {
1051         struct ieee80211_local *local = hw_to_local(hw);
1052         struct ieee80211_sub_if_data *sdata;
1053
1054         if (vif) {
1055                 sdata = vif_to_sdata(vif);
1056                 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
1057         } else {
1058                 list_for_each_entry_rcu(sdata, &local->interfaces, list)
1059                         _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
1060         }
1061 }
1062 EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
1063
1064 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
1065                                       struct list_head *keys)
1066 {
1067         struct ieee80211_key *key, *tmp;
1068
1069         decrease_tailroom_need_count(sdata,
1070                                      sdata->crypto_tx_tailroom_pending_dec);
1071         sdata->crypto_tx_tailroom_pending_dec = 0;
1072
1073         ieee80211_debugfs_key_remove_mgmt_default(sdata);
1074         ieee80211_debugfs_key_remove_beacon_default(sdata);
1075
1076         list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
1077                 ieee80211_key_replace(key->sdata, NULL, key->sta,
1078                                       key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1079                                       key, NULL);
1080                 list_add_tail(&key->list, keys);
1081         }
1082
1083         ieee80211_debugfs_key_update_default(sdata);
1084 }
1085
1086 void ieee80211_remove_link_keys(struct ieee80211_link_data *link,
1087                                 struct list_head *keys)
1088 {
1089         struct ieee80211_sub_if_data *sdata = link->sdata;
1090         struct ieee80211_local *local = sdata->local;
1091         struct ieee80211_key *key, *tmp;
1092
1093         mutex_lock(&local->key_mtx);
1094         list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
1095                 if (key->conf.link_id != link->link_id)
1096                         continue;
1097                 ieee80211_key_replace(key->sdata, link, key->sta,
1098                                       key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1099                                       key, NULL);
1100                 list_add_tail(&key->list, keys);
1101         }
1102         mutex_unlock(&local->key_mtx);
1103 }
1104
1105 void ieee80211_free_key_list(struct ieee80211_local *local,
1106                              struct list_head *keys)
1107 {
1108         struct ieee80211_key *key, *tmp;
1109
1110         mutex_lock(&local->key_mtx);
1111         list_for_each_entry_safe(key, tmp, keys, list)
1112                 __ieee80211_key_destroy(key, false);
1113         mutex_unlock(&local->key_mtx);
1114 }
1115
1116 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
1117                          bool force_synchronize)
1118 {
1119         struct ieee80211_local *local = sdata->local;
1120         struct ieee80211_sub_if_data *vlan;
1121         struct ieee80211_sub_if_data *master;
1122         struct ieee80211_key *key, *tmp;
1123         LIST_HEAD(keys);
1124
1125         cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
1126
1127         mutex_lock(&local->key_mtx);
1128
1129         ieee80211_free_keys_iface(sdata, &keys);
1130
1131         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1132                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1133                         ieee80211_free_keys_iface(vlan, &keys);
1134         }
1135
1136         if (!list_empty(&keys) || force_synchronize)
1137                 synchronize_net();
1138         list_for_each_entry_safe(key, tmp, &keys, list)
1139                 __ieee80211_key_destroy(key, false);
1140
1141         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1142                 if (sdata->bss) {
1143                         master = container_of(sdata->bss,
1144                                               struct ieee80211_sub_if_data,
1145                                               u.ap);
1146
1147                         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
1148                                      master->crypto_tx_tailroom_needed_cnt);
1149                 }
1150         } else {
1151                 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
1152                              sdata->crypto_tx_tailroom_pending_dec);
1153         }
1154
1155         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1156                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1157                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
1158                                      vlan->crypto_tx_tailroom_pending_dec);
1159         }
1160
1161         mutex_unlock(&local->key_mtx);
1162 }
1163
1164 void ieee80211_free_sta_keys(struct ieee80211_local *local,
1165                              struct sta_info *sta)
1166 {
1167         struct ieee80211_key *key;
1168         int i;
1169
1170         mutex_lock(&local->key_mtx);
1171         for (i = 0; i < ARRAY_SIZE(sta->deflink.gtk); i++) {
1172                 key = key_mtx_dereference(local, sta->deflink.gtk[i]);
1173                 if (!key)
1174                         continue;
1175                 ieee80211_key_replace(key->sdata, NULL, key->sta,
1176                                       key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1177                                       key, NULL);
1178                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1179                                         NL80211_IFTYPE_STATION);
1180         }
1181
1182         for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1183                 key = key_mtx_dereference(local, sta->ptk[i]);
1184                 if (!key)
1185                         continue;
1186                 ieee80211_key_replace(key->sdata, NULL, key->sta,
1187                                       key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1188                                       key, NULL);
1189                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1190                                         NL80211_IFTYPE_STATION);
1191         }
1192
1193         mutex_unlock(&local->key_mtx);
1194 }
1195
1196 void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
1197 {
1198         struct ieee80211_sub_if_data *sdata;
1199
1200         sdata = container_of(wk, struct ieee80211_sub_if_data,
1201                              dec_tailroom_needed_wk.work);
1202
1203         /*
1204          * The reason for the delayed tailroom needed decrementing is to
1205          * make roaming faster: during roaming, all keys are first deleted
1206          * and then new keys are installed. The first new key causes the
1207          * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
1208          * the cost of synchronize_net() (which can be slow). Avoid this
1209          * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
1210          * key removal for a while, so if we roam the value is larger than
1211          * zero and no 0->1 transition happens.
1212          *
1213          * The cost is that if the AP switching was from an AP with keys
1214          * to one without, we still allocate tailroom while it would no
1215          * longer be needed. However, in the typical (fast) roaming case
1216          * within an ESS this usually won't happen.
1217          */
1218
1219         mutex_lock(&sdata->local->key_mtx);
1220         decrease_tailroom_need_count(sdata,
1221                                      sdata->crypto_tx_tailroom_pending_dec);
1222         sdata->crypto_tx_tailroom_pending_dec = 0;
1223         mutex_unlock(&sdata->local->key_mtx);
1224 }
1225
1226 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
1227                                 const u8 *replay_ctr, gfp_t gfp)
1228 {
1229         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1230
1231         trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
1232
1233         cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
1234 }
1235 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
1236
1237 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
1238                               int tid, struct ieee80211_key_seq *seq)
1239 {
1240         struct ieee80211_key *key;
1241         const u8 *pn;
1242
1243         key = container_of(keyconf, struct ieee80211_key, conf);
1244
1245         switch (key->conf.cipher) {
1246         case WLAN_CIPHER_SUITE_TKIP:
1247                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1248                         return;
1249                 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
1250                 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
1251                 break;
1252         case WLAN_CIPHER_SUITE_CCMP:
1253         case WLAN_CIPHER_SUITE_CCMP_256:
1254                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1255                         return;
1256                 if (tid < 0)
1257                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1258                 else
1259                         pn = key->u.ccmp.rx_pn[tid];
1260                 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
1261                 break;
1262         case WLAN_CIPHER_SUITE_AES_CMAC:
1263         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1264                 if (WARN_ON(tid != 0))
1265                         return;
1266                 pn = key->u.aes_cmac.rx_pn;
1267                 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
1268                 break;
1269         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1270         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1271                 if (WARN_ON(tid != 0))
1272                         return;
1273                 pn = key->u.aes_gmac.rx_pn;
1274                 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
1275                 break;
1276         case WLAN_CIPHER_SUITE_GCMP:
1277         case WLAN_CIPHER_SUITE_GCMP_256:
1278                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1279                         return;
1280                 if (tid < 0)
1281                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1282                 else
1283                         pn = key->u.gcmp.rx_pn[tid];
1284                 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
1285                 break;
1286         }
1287 }
1288 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
1289
1290 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1291                               int tid, struct ieee80211_key_seq *seq)
1292 {
1293         struct ieee80211_key *key;
1294         u8 *pn;
1295
1296         key = container_of(keyconf, struct ieee80211_key, conf);
1297
1298         switch (key->conf.cipher) {
1299         case WLAN_CIPHER_SUITE_TKIP:
1300                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1301                         return;
1302                 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1303                 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1304                 break;
1305         case WLAN_CIPHER_SUITE_CCMP:
1306         case WLAN_CIPHER_SUITE_CCMP_256:
1307                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1308                         return;
1309                 if (tid < 0)
1310                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1311                 else
1312                         pn = key->u.ccmp.rx_pn[tid];
1313                 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1314                 break;
1315         case WLAN_CIPHER_SUITE_AES_CMAC:
1316         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1317                 if (WARN_ON(tid != 0))
1318                         return;
1319                 pn = key->u.aes_cmac.rx_pn;
1320                 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1321                 break;
1322         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1323         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1324                 if (WARN_ON(tid != 0))
1325                         return;
1326                 pn = key->u.aes_gmac.rx_pn;
1327                 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1328                 break;
1329         case WLAN_CIPHER_SUITE_GCMP:
1330         case WLAN_CIPHER_SUITE_GCMP_256:
1331                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1332                         return;
1333                 if (tid < 0)
1334                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1335                 else
1336                         pn = key->u.gcmp.rx_pn[tid];
1337                 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1338                 break;
1339         default:
1340                 WARN_ON(1);
1341                 break;
1342         }
1343 }
1344 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1345
1346 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1347 {
1348         struct ieee80211_key *key;
1349
1350         key = container_of(keyconf, struct ieee80211_key, conf);
1351
1352         assert_key_lock(key->local);
1353
1354         /*
1355          * if key was uploaded, we assume the driver will/has remove(d)
1356          * it, so adjust bookkeeping accordingly
1357          */
1358         if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1359                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1360
1361                 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
1362                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
1363                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1364                         increment_tailroom_need_count(key->sdata);
1365         }
1366
1367         ieee80211_key_free(key, false);
1368 }
1369 EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1370
1371 struct ieee80211_key_conf *
1372 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1373                         struct ieee80211_key_conf *keyconf)
1374 {
1375         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1376         struct ieee80211_local *local = sdata->local;
1377         struct ieee80211_key *key;
1378         int err;
1379
1380         if (WARN_ON(!local->wowlan))
1381                 return ERR_PTR(-EINVAL);
1382
1383         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1384                 return ERR_PTR(-EINVAL);
1385
1386         key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1387                                   keyconf->keylen, keyconf->key,
1388                                   0, NULL);
1389         if (IS_ERR(key))
1390                 return ERR_CAST(key);
1391
1392         if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1393                 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1394
1395         /* FIXME: this function needs to get a link ID */
1396         err = ieee80211_key_link(key, &sdata->deflink, NULL);
1397         if (err)
1398                 return ERR_PTR(err);
1399
1400         return &key->conf;
1401 }
1402 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);
1403
1404 void ieee80211_key_mic_failure(struct ieee80211_key_conf *keyconf)
1405 {
1406         struct ieee80211_key *key;
1407
1408         key = container_of(keyconf, struct ieee80211_key, conf);
1409
1410         switch (key->conf.cipher) {
1411         case WLAN_CIPHER_SUITE_AES_CMAC:
1412         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1413                 key->u.aes_cmac.icverrors++;
1414                 break;
1415         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1416         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1417                 key->u.aes_gmac.icverrors++;
1418                 break;
1419         default:
1420                 /* ignore the others for now, we don't keep counters now */
1421                 break;
1422         }
1423 }
1424 EXPORT_SYMBOL_GPL(ieee80211_key_mic_failure);
1425
1426 void ieee80211_key_replay(struct ieee80211_key_conf *keyconf)
1427 {
1428         struct ieee80211_key *key;
1429
1430         key = container_of(keyconf, struct ieee80211_key, conf);
1431
1432         switch (key->conf.cipher) {
1433         case WLAN_CIPHER_SUITE_CCMP:
1434         case WLAN_CIPHER_SUITE_CCMP_256:
1435                 key->u.ccmp.replays++;
1436                 break;
1437         case WLAN_CIPHER_SUITE_AES_CMAC:
1438         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1439                 key->u.aes_cmac.replays++;
1440                 break;
1441         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1442         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1443                 key->u.aes_gmac.replays++;
1444                 break;
1445         case WLAN_CIPHER_SUITE_GCMP:
1446         case WLAN_CIPHER_SUITE_GCMP_256:
1447                 key->u.gcmp.replays++;
1448                 break;
1449         }
1450 }
1451 EXPORT_SYMBOL_GPL(ieee80211_key_replay);
1452
1453 int ieee80211_key_switch_links(struct ieee80211_sub_if_data *sdata,
1454                                unsigned long del_links_mask,
1455                                unsigned long add_links_mask)
1456 {
1457         struct ieee80211_key *key;
1458         int ret;
1459
1460         list_for_each_entry(key, &sdata->key_list, list) {
1461                 if (key->conf.link_id < 0 ||
1462                     !(del_links_mask & BIT(key->conf.link_id)))
1463                         continue;
1464
1465                 /* shouldn't happen for per-link keys */
1466                 WARN_ON(key->sta);
1467
1468                 ieee80211_key_disable_hw_accel(key);
1469         }
1470
1471         list_for_each_entry(key, &sdata->key_list, list) {
1472                 if (key->conf.link_id < 0 ||
1473                     !(add_links_mask & BIT(key->conf.link_id)))
1474                         continue;
1475
1476                 /* shouldn't happen for per-link keys */
1477                 WARN_ON(key->sta);
1478
1479                 ret = ieee80211_key_enable_hw_accel(key);
1480                 if (ret)
1481                         return ret;
1482         }
1483
1484         return 0;
1485 }