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
  57 update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta)
  58 {
  59         struct ieee80211_sub_if_data *vlan;
  60
  61         if (sdata->vif.type != NL80211_IFTYPE_AP)
  62                 return;
  63
  64         /* crypto_tx_tailroom_needed_cnt is protected by this */
  65         lockdep_assert_wiphy(sdata->local->hw.wiphy);
  66
  67         rcu_read_lock();
  68
  69         list_for_each_entry_rcu(vlan, &sdata->u.ap.vlans, u.vlan.list)
  70                 vlan->crypto_tx_tailroom_needed_cnt += delta;
  71
  72         rcu_read_unlock();
  73 }
  74
  75 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
  76 {
  77         /*
  78          * When this count is zero, SKB resizing for allocating tailroom
  79          * for IV or MMIC is skipped. But, this check has created two race
  80          * cases in xmit path while transiting from zero count to one:
  81          *
  82          * 1. SKB resize was skipped because no key was added but just before
  83          * the xmit key is added and SW encryption kicks off.
  84          *
  85          * 2. SKB resize was skipped because all the keys were hw planted but
  86          * just before xmit one of the key is deleted and SW encryption kicks
  87          * off.
  88          *
  89          * In both the above case SW encryption will find not enough space for
  90          * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
  91          *
  92          * Solution has been explained at
  93          * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
  94          */
  95
  96         lockdep_assert_wiphy(sdata->local->hw.wiphy);
  97
  98         update_vlan_tailroom_need_count(sdata, 1);
  99
 100         if (!sdata->crypto_tx_tailroom_needed_cnt++) {
 101                 /*
 102                  * Flush all XMIT packets currently using HW encryption or no
 103                  * encryption at all if the count transition is from 0 -> 1.
 104                  */
 105                 synchronize_net();
 106         }
 107 }
 108
 109 static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata,
 110                                          int delta)
 111 {
 112         lockdep_assert_wiphy(sdata->local->hw.wiphy);
 113
 114         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta);
 115
 116         update_vlan_tailroom_need_count(sdata, -delta);
 117         sdata->crypto_tx_tailroom_needed_cnt -= delta;
 118 }
 119
 120 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
 121 {
 122         struct ieee80211_sub_if_data *sdata = key->sdata;
 123         struct sta_info *sta;
 124         int ret = -EOPNOTSUPP;
 125
 126         might_sleep();
 127         lockdep_assert_wiphy(key->local->hw.wiphy);
 128
 129         if (key->flags & KEY_FLAG_TAINTED) {
 130                 /* If we get here, it's during resume and the key is
 131                  * tainted so shouldn't be used/programmed any more.
 132                  * However, its flags may still indicate that it was
 133                  * programmed into the device (since we're in resume)
 134                  * so clear that flag now to avoid trying to remove
 135                  * it again later.
 136                  */
 137                 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE &&
 138                     !(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
 139                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
 140                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 141                         increment_tailroom_need_count(sdata);
 142
 143                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 144                 return -EINVAL;
 145         }
 146
 147         if (!key->local->ops->set_key)
 148                 goto out_unsupported;
 149
 150         sta = key->sta;
 151
 152         /*
 153          * If this is a per-STA GTK, check if it
 154          * is supported; if not, return.
 155          */
 156         if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) &&
 157             !ieee80211_hw_check(&key->local->hw, SUPPORTS_PER_STA_GTK))
 158                 goto out_unsupported;
 159
 160         if (sta && !sta->uploaded)
 161                 goto out_unsupported;
 162
 163         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 164                 /*
 165                  * The driver doesn't know anything about VLAN interfaces.
 166                  * Hence, don't send GTKs for VLAN interfaces to the driver.
 167                  */
 168                 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
 169                         ret = 1;
 170                         goto out_unsupported;
 171                 }
 172         }
 173
 174         if (key->conf.link_id >= 0 && sdata->vif.active_links &&
 175             !(sdata->vif.active_links & BIT(key->conf.link_id)))
 176                 return 0;
 177
 178         ret = drv_set_key(key->local, SET_KEY, sdata,
 179                           sta ? &sta->sta : NULL, &key->conf);
 180
 181         if (!ret) {
 182                 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
 183
 184                 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
 185                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
 186                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 187                         decrease_tailroom_need_count(sdata, 1);
 188
 189                 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
 190                         (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
 191
 192                 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) &&
 193                         (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC));
 194
 195                 return 0;
 196         }
 197
 198         if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1)
 199                 sdata_err(sdata,
 200                           "failed to set key (%d, %pM) to hardware (%d)\n",
 201                           key->conf.keyidx,
 202                           sta ? sta->sta.addr : bcast_addr, ret);
 203
 204  out_unsupported:
 205         switch (key->conf.cipher) {
 206         case WLAN_CIPHER_SUITE_WEP40:
 207         case WLAN_CIPHER_SUITE_WEP104:
 208         case WLAN_CIPHER_SUITE_TKIP:
 209         case WLAN_CIPHER_SUITE_CCMP:
 210         case WLAN_CIPHER_SUITE_CCMP_256:
 211         case WLAN_CIPHER_SUITE_GCMP:
 212         case WLAN_CIPHER_SUITE_GCMP_256:
 213         case WLAN_CIPHER_SUITE_AES_CMAC:
 214         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 215         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 216         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 217                 /* all of these we can do in software - if driver can */
 218                 if (ret == 1)
 219                         return 0;
 220                 if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL))
 221                         return -EINVAL;
 222                 return 0;
 223         default:
 224                 return -EINVAL;
 225         }
 226 }
 227
 228 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
 229 {
 230         struct ieee80211_sub_if_data *sdata;
 231         struct sta_info *sta;
 232         int ret;
 233
 234         might_sleep();
 235
 236         if (!key || !key->local->ops->set_key)
 237                 return;
 238
 239         if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 240                 return;
 241
 242         sta = key->sta;
 243         sdata = key->sdata;
 244
 245         lockdep_assert_wiphy(key->local->hw.wiphy);
 246
 247         if (key->conf.link_id >= 0 && sdata->vif.active_links &&
 248             !(sdata->vif.active_links & BIT(key->conf.link_id)))
 249                 return;
 250
 251         if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
 252                                  IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
 253                                  IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 254                 increment_tailroom_need_count(sdata);
 255
 256         key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 257         ret = drv_set_key(key->local, DISABLE_KEY, sdata,
 258                           sta ? &sta->sta : NULL, &key->conf);
 259
 260         if (ret)
 261                 sdata_err(sdata,
 262                           "failed to remove key (%d, %pM) from hardware (%d)\n",
 263                           key->conf.keyidx,
 264                           sta ? sta->sta.addr : bcast_addr, ret);
 265 }
 266
 267 static int _ieee80211_set_tx_key(struct ieee80211_key *key, bool force)
 268 {
 269         struct sta_info *sta = key->sta;
 270         struct ieee80211_local *local = key->local;
 271
 272         lockdep_assert_wiphy(local->hw.wiphy);
 273
 274         set_sta_flag(sta, WLAN_STA_USES_ENCRYPTION);
 275
 276         sta->ptk_idx = key->conf.keyidx;
 277
 278         if (force || !ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT))
 279                 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
 280         ieee80211_check_fast_xmit(sta);
 281
 282         return 0;
 283 }
 284
 285 int ieee80211_set_tx_key(struct ieee80211_key *key)
 286 {
 287         return _ieee80211_set_tx_key(key, false);
 288 }
 289
 290 static void ieee80211_pairwise_rekey(struct ieee80211_key *old,
 291                                      struct ieee80211_key *new)
 292 {
 293         struct ieee80211_local *local = new->local;
 294         struct sta_info *sta = new->sta;
 295         int i;
 296
 297         lockdep_assert_wiphy(local->hw.wiphy);
 298
 299         if (new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX) {
 300                 /* Extended Key ID key install, initial one or rekey */
 301
 302                 if (sta->ptk_idx != INVALID_PTK_KEYIDX &&
 303                     !ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT)) {
 304                         /* Aggregation Sessions with Extended Key ID must not
 305                          * mix MPDUs with different keyIDs within one A-MPDU.
 306                          * Tear down running Tx aggregation sessions and block
 307                          * new Rx/Tx aggregation requests during rekey to
 308                          * ensure there are no A-MPDUs when the driver is not
 309                          * supporting A-MPDU key borders. (Blocking Tx only
 310                          * would be sufficient but WLAN_STA_BLOCK_BA gets the
 311                          * job done for the few ms we need it.)
 312                          */
 313                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
 314                         for (i = 0; i <  IEEE80211_NUM_TIDS; i++)
 315                                 __ieee80211_stop_tx_ba_session(sta, i,
 316                                                                AGG_STOP_LOCAL_REQUEST);
 317                 }
 318         } else if (old) {
 319                 /* Rekey without Extended Key ID.
 320                  * Aggregation sessions are OK when running on SW crypto.
 321                  * A broken remote STA may cause issues not observed with HW
 322                  * crypto, though.
 323                  */
 324                 if (!(old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 325                         return;
 326
 327                 /* Stop Tx till we are on the new key */
 328                 old->flags |= KEY_FLAG_TAINTED;
 329                 ieee80211_clear_fast_xmit(sta);
 330                 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
 331                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
 332                         ieee80211_sta_tear_down_BA_sessions(sta,
 333                                                             AGG_STOP_LOCAL_REQUEST);
 334                 }
 335                 if (!wiphy_ext_feature_isset(local->hw.wiphy,
 336                                              NL80211_EXT_FEATURE_CAN_REPLACE_PTK0)) {
 337                         pr_warn_ratelimited("Rekeying PTK for STA %pM but driver can't safely do that.",
 338                                             sta->sta.addr);
 339                         /* Flushing the driver queues *may* help prevent
 340                          * the clear text leaks and freezes.
 341                          */
 342                         ieee80211_flush_queues(local, old->sdata, false);
 343                 }
 344         }
 345 }
 346
 347 static void __ieee80211_set_default_key(struct ieee80211_link_data *link,
 348                                         int idx, bool uni, bool multi)
 349 {
 350         struct ieee80211_sub_if_data *sdata = link->sdata;
 351         struct ieee80211_key *key = NULL;
 352
 353         lockdep_assert_wiphy(sdata->local->hw.wiphy);
 354
 355         if (idx >= 0 && idx < NUM_DEFAULT_KEYS) {
 356                 key = wiphy_dereference(sdata->local->hw.wiphy,
 357                                         sdata->keys[idx]);
 358                 if (!key)
 359                         key = wiphy_dereference(sdata->local->hw.wiphy,
 360                                                 link->gtk[idx]);
 361         }
 362
 363         if (uni) {
 364                 rcu_assign_pointer(sdata->default_unicast_key, key);
 365                 ieee80211_check_fast_xmit_iface(sdata);
 366                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
 367                         drv_set_default_unicast_key(sdata->local, sdata, idx);
 368         }
 369
 370         if (multi)
 371                 rcu_assign_pointer(link->default_multicast_key, key);
 372
 373         ieee80211_debugfs_key_update_default(sdata);
 374 }
 375
 376 void ieee80211_set_default_key(struct ieee80211_link_data *link, int idx,
 377                                bool uni, bool multi)
 378 {
 379         lockdep_assert_wiphy(link->sdata->local->hw.wiphy);
 380
 381         __ieee80211_set_default_key(link, idx, uni, multi);
 382 }
 383
 384 static void
 385 __ieee80211_set_default_mgmt_key(struct ieee80211_link_data *link, int idx)
 386 {
 387         struct ieee80211_sub_if_data *sdata = link->sdata;
 388         struct ieee80211_key *key = NULL;
 389
 390         lockdep_assert_wiphy(sdata->local->hw.wiphy);
 391
 392         if (idx >= NUM_DEFAULT_KEYS &&
 393             idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
 394                 key = wiphy_dereference(sdata->local->hw.wiphy,
 395                                         link->gtk[idx]);
 396
 397         rcu_assign_pointer(link->default_mgmt_key, key);
 398
 399         ieee80211_debugfs_key_update_default(sdata);
 400 }
 401
 402 void ieee80211_set_default_mgmt_key(struct ieee80211_link_data *link,
 403                                     int idx)
 404 {
 405         lockdep_assert_wiphy(link->sdata->local->hw.wiphy);
 406
 407         __ieee80211_set_default_mgmt_key(link, idx);
 408 }
 409
 410 static void
 411 __ieee80211_set_default_beacon_key(struct ieee80211_link_data *link, int idx)
 412 {
 413         struct ieee80211_sub_if_data *sdata = link->sdata;
 414         struct ieee80211_key *key = NULL;
 415
 416         lockdep_assert_wiphy(sdata->local->hw.wiphy);
 417
 418         if (idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS &&
 419             idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
 420             NUM_DEFAULT_BEACON_KEYS)
 421                 key = wiphy_dereference(sdata->local->hw.wiphy,
 422                                         link->gtk[idx]);
 423
 424         rcu_assign_pointer(link->default_beacon_key, key);
 425
 426         ieee80211_debugfs_key_update_default(sdata);
 427 }
 428
 429 void ieee80211_set_default_beacon_key(struct ieee80211_link_data *link,
 430                                       int idx)
 431 {
 432         lockdep_assert_wiphy(link->sdata->local->hw.wiphy);
 433
 434         __ieee80211_set_default_beacon_key(link, idx);
 435 }
 436
 437 static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
 438                                  struct ieee80211_link_data *link,
 439                                  struct sta_info *sta,
 440                                  bool pairwise,
 441                                  struct ieee80211_key *old,
 442                                  struct ieee80211_key *new)
 443 {
 444         struct link_sta_info *link_sta = sta ? &sta->deflink : NULL;
 445         int link_id;
 446         int idx;
 447         int ret = 0;
 448         bool defunikey, defmultikey, defmgmtkey, defbeaconkey;
 449         bool is_wep;
 450
 451         lockdep_assert_wiphy(sdata->local->hw.wiphy);
 452
 453         /* caller must provide at least one old/new */
 454         if (WARN_ON(!new && !old))
 455                 return 0;
 456
 457         if (new) {
 458                 idx = new->conf.keyidx;
 459                 is_wep = new->conf.cipher == WLAN_CIPHER_SUITE_WEP40 ||
 460                          new->conf.cipher == WLAN_CIPHER_SUITE_WEP104;
 461                 link_id = new->conf.link_id;
 462         } else {
 463                 idx = old->conf.keyidx;
 464                 is_wep = old->conf.cipher == WLAN_CIPHER_SUITE_WEP40 ||
 465                          old->conf.cipher == WLAN_CIPHER_SUITE_WEP104;
 466                 link_id = old->conf.link_id;
 467         }
 468
 469         if (WARN(old && old->conf.link_id != link_id,
 470                  "old link ID %d doesn't match new link ID %d\n",
 471                  old->conf.link_id, link_id))
 472                 return -EINVAL;
 473
 474         if (link_id >= 0) {
 475                 if (!link) {
 476                         link = sdata_dereference(sdata->link[link_id], sdata);
 477                         if (!link)
 478                                 return -ENOLINK;
 479                 }
 480
 481                 if (sta) {
 482                         link_sta = rcu_dereference_protected(sta->link[link_id],
 483                                                              lockdep_is_held(&sta->local->hw.wiphy->mtx));
 484                         if (!link_sta)
 485                                 return -ENOLINK;
 486                 }
 487         } else {
 488                 link = &sdata->deflink;
 489         }
 490
 491         if ((is_wep || pairwise) && idx >= NUM_DEFAULT_KEYS)
 492                 return -EINVAL;
 493
 494         WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
 495
 496         if (new && sta && pairwise) {
 497                 /* Unicast rekey needs special handling. With Extended Key ID
 498                  * old is still NULL for the first rekey.
 499                  */
 500                 ieee80211_pairwise_rekey(old, new);
 501         }
 502
 503         if (old) {
 504                 if (old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
 505                         ieee80211_key_disable_hw_accel(old);
 506
 507                         if (new)
 508                                 ret = ieee80211_key_enable_hw_accel(new);
 509                 }
 510         } else {
 511                 if (!new->local->wowlan)
 512                         ret = ieee80211_key_enable_hw_accel(new);
 513                 else
 514                         new->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
 515         }
 516
 517         if (ret)
 518                 return ret;
 519
 520         if (new)
 521                 list_add_tail_rcu(&new->list, &sdata->key_list);
 522
 523         if (sta) {
 524                 if (pairwise) {
 525                         rcu_assign_pointer(sta->ptk[idx], new);
 526                         if (new &&
 527                             !(new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX))
 528                                 _ieee80211_set_tx_key(new, true);
 529                 } else {
 530                         rcu_assign_pointer(link_sta->gtk[idx], new);
 531                 }
 532                 /* Only needed for transition from no key -> key.
 533                  * Still triggers unnecessary when using Extended Key ID
 534                  * and installing the second key ID the first time.
 535                  */
 536                 if (new && !old)
 537                         ieee80211_check_fast_rx(sta);
 538         } else {
 539                 defunikey = old &&
 540                         old == wiphy_dereference(sdata->local->hw.wiphy,
 541                                                  sdata->default_unicast_key);
 542                 defmultikey = old &&
 543                         old == wiphy_dereference(sdata->local->hw.wiphy,
 544                                                  link->default_multicast_key);
 545                 defmgmtkey = old &&
 546                         old == wiphy_dereference(sdata->local->hw.wiphy,
 547                                                  link->default_mgmt_key);
 548                 defbeaconkey = old &&
 549                         old == wiphy_dereference(sdata->local->hw.wiphy,
 550                                                  link->default_beacon_key);
 551
 552                 if (defunikey && !new)
 553                         __ieee80211_set_default_key(link, -1, true, false);
 554                 if (defmultikey && !new)
 555                         __ieee80211_set_default_key(link, -1, false, true);
 556                 if (defmgmtkey && !new)
 557                         __ieee80211_set_default_mgmt_key(link, -1);
 558                 if (defbeaconkey && !new)
 559                         __ieee80211_set_default_beacon_key(link, -1);
 560
 561                 if (is_wep || pairwise)
 562                         rcu_assign_pointer(sdata->keys[idx], new);
 563                 else
 564                         rcu_assign_pointer(link->gtk[idx], new);
 565
 566                 if (defunikey && new)
 567                         __ieee80211_set_default_key(link, new->conf.keyidx,
 568                                                     true, false);
 569                 if (defmultikey && new)
 570                         __ieee80211_set_default_key(link, new->conf.keyidx,
 571                                                     false, true);
 572                 if (defmgmtkey && new)
 573                         __ieee80211_set_default_mgmt_key(link,
 574                                                          new->conf.keyidx);
 575                 if (defbeaconkey && new)
 576                         __ieee80211_set_default_beacon_key(link,
 577                                                            new->conf.keyidx);
 578         }
 579
 580         if (old)
 581                 list_del_rcu(&old->list);
 582
 583         return 0;
 584 }
 585
 586 struct ieee80211_key *
 587 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
 588                     const u8 *key_data,
 589                     size_t seq_len, const u8 *seq)
 590 {
 591         struct ieee80211_key *key;
 592         int i, j, err;
 593
 594         if (WARN_ON(idx < 0 ||
 595                     idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
 596                     NUM_DEFAULT_BEACON_KEYS))
 597                 return ERR_PTR(-EINVAL);
 598
 599         key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
 600         if (!key)
 601                 return ERR_PTR(-ENOMEM);
 602
 603         /*
 604          * Default to software encryption; we'll later upload the
 605          * key to the hardware if possible.
 606          */
 607         key->conf.flags = 0;
 608         key->flags = 0;
 609
 610         key->conf.link_id = -1;
 611         key->conf.cipher = cipher;
 612         key->conf.keyidx = idx;
 613         key->conf.keylen = key_len;
 614         switch (cipher) {
 615         case WLAN_CIPHER_SUITE_WEP40:
 616         case WLAN_CIPHER_SUITE_WEP104:
 617                 key->conf.iv_len = IEEE80211_WEP_IV_LEN;
 618                 key->conf.icv_len = IEEE80211_WEP_ICV_LEN;
 619                 break;
 620         case WLAN_CIPHER_SUITE_TKIP:
 621                 key->conf.iv_len = IEEE80211_TKIP_IV_LEN;
 622                 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN;
 623                 if (seq) {
 624                         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
 625                                 key->u.tkip.rx[i].iv32 =
 626                                         get_unaligned_le32(&seq[2]);
 627                                 key->u.tkip.rx[i].iv16 =
 628                                         get_unaligned_le16(seq);
 629                         }
 630                 }
 631                 spin_lock_init(&key->u.tkip.txlock);
 632                 break;
 633         case WLAN_CIPHER_SUITE_CCMP:
 634                 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN;
 635                 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN;
 636                 if (seq) {
 637                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 638                                 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++)
 639                                         key->u.ccmp.rx_pn[i][j] =
 640                                                 seq[IEEE80211_CCMP_PN_LEN - j - 1];
 641                 }
 642                 /*
 643                  * Initialize AES key state here as an optimization so that
 644                  * it does not need to be initialized for every packet.
 645                  */
 646                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 647                         key_data, key_len, IEEE80211_CCMP_MIC_LEN);
 648                 if (IS_ERR(key->u.ccmp.tfm)) {
 649                         err = PTR_ERR(key->u.ccmp.tfm);
 650                         kfree(key);
 651                         return ERR_PTR(err);
 652                 }
 653                 break;
 654         case WLAN_CIPHER_SUITE_CCMP_256:
 655                 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN;
 656                 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN;
 657                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 658                         for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++)
 659                                 key->u.ccmp.rx_pn[i][j] =
 660                                         seq[IEEE80211_CCMP_256_PN_LEN - j - 1];
 661                 /* Initialize AES key state here as an optimization so that
 662                  * it does not need to be initialized for every packet.
 663                  */
 664                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 665                         key_data, key_len, IEEE80211_CCMP_256_MIC_LEN);
 666                 if (IS_ERR(key->u.ccmp.tfm)) {
 667                         err = PTR_ERR(key->u.ccmp.tfm);
 668                         kfree(key);
 669                         return ERR_PTR(err);
 670                 }
 671                 break;
 672         case WLAN_CIPHER_SUITE_AES_CMAC:
 673         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 674                 key->conf.iv_len = 0;
 675                 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
 676                         key->conf.icv_len = sizeof(struct ieee80211_mmie);
 677                 else
 678                         key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 679                 if (seq)
 680                         for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
 681                                 key->u.aes_cmac.rx_pn[j] =
 682                                         seq[IEEE80211_CMAC_PN_LEN - j - 1];
 683                 /*
 684                  * Initialize AES key state here as an optimization so that
 685                  * it does not need to be initialized for every packet.
 686                  */
 687                 key->u.aes_cmac.tfm =
 688                         ieee80211_aes_cmac_key_setup(key_data, key_len);
 689                 if (IS_ERR(key->u.aes_cmac.tfm)) {
 690                         err = PTR_ERR(key->u.aes_cmac.tfm);
 691                         kfree(key);
 692                         return ERR_PTR(err);
 693                 }
 694                 break;
 695         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 696         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 697                 key->conf.iv_len = 0;
 698                 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 699                 if (seq)
 700                         for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++)
 701                                 key->u.aes_gmac.rx_pn[j] =
 702                                         seq[IEEE80211_GMAC_PN_LEN - j - 1];
 703                 /* Initialize AES key state here as an optimization so that
 704                  * it does not need to be initialized for every packet.
 705                  */
 706                 key->u.aes_gmac.tfm =
 707                         ieee80211_aes_gmac_key_setup(key_data, key_len);
 708                 if (IS_ERR(key->u.aes_gmac.tfm)) {
 709                         err = PTR_ERR(key->u.aes_gmac.tfm);
 710                         kfree(key);
 711                         return ERR_PTR(err);
 712                 }
 713                 break;
 714         case WLAN_CIPHER_SUITE_GCMP:
 715         case WLAN_CIPHER_SUITE_GCMP_256:
 716                 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
 717                 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
 718                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 719                         for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
 720                                 key->u.gcmp.rx_pn[i][j] =
 721                                         seq[IEEE80211_GCMP_PN_LEN - j - 1];
 722                 /* Initialize AES key state here as an optimization so that
 723                  * it does not need to be initialized for every packet.
 724                  */
 725                 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
 726                                                                       key_len);
 727                 if (IS_ERR(key->u.gcmp.tfm)) {
 728                         err = PTR_ERR(key->u.gcmp.tfm);
 729                         kfree(key);
 730                         return ERR_PTR(err);
 731                 }
 732                 break;
 733         }
 734         memcpy(key->conf.key, key_data, key_len);
 735         INIT_LIST_HEAD(&key->list);
 736
 737         return key;
 738 }
 739
 740 static void ieee80211_key_free_common(struct ieee80211_key *key)
 741 {
 742         switch (key->conf.cipher) {
 743         case WLAN_CIPHER_SUITE_CCMP:
 744         case WLAN_CIPHER_SUITE_CCMP_256:
 745                 ieee80211_aes_key_free(key->u.ccmp.tfm);
 746                 break;
 747         case WLAN_CIPHER_SUITE_AES_CMAC:
 748         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 749                 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
 750                 break;
 751         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 752         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 753                 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm);
 754                 break;
 755         case WLAN_CIPHER_SUITE_GCMP:
 756         case WLAN_CIPHER_SUITE_GCMP_256:
 757                 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
 758                 break;
 759         }
 760         kfree_sensitive(key);
 761 }
 762
 763 static void __ieee80211_key_destroy(struct ieee80211_key *key,
 764                                     bool delay_tailroom)
 765 {
 766         if (key->local) {
 767                 struct ieee80211_sub_if_data *sdata = key->sdata;
 768
 769                 ieee80211_debugfs_key_remove(key);
 770
 771                 if (delay_tailroom) {
 772                         /* see ieee80211_delayed_tailroom_dec */
 773                         sdata->crypto_tx_tailroom_pending_dec++;
 774                         wiphy_delayed_work_queue(sdata->local->hw.wiphy,
 775                                                  &sdata->dec_tailroom_needed_wk,
 776                                                  HZ / 2);
 777                 } else {
 778                         decrease_tailroom_need_count(sdata, 1);
 779                 }
 780         }
 781
 782         ieee80211_key_free_common(key);
 783 }
 784
 785 static void ieee80211_key_destroy(struct ieee80211_key *key,
 786                                   bool delay_tailroom)
 787 {
 788         if (!key)
 789                 return;
 790
 791         /*
 792          * Synchronize so the TX path and rcu key iterators
 793          * can no longer be using this key before we free/remove it.
 794          */
 795         synchronize_net();
 796
 797         __ieee80211_key_destroy(key, delay_tailroom);
 798 }
 799
 800 void ieee80211_key_free_unused(struct ieee80211_key *key)
 801 {
 802         if (!key)
 803                 return;
 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;
 858
 859         lockdep_assert_wiphy(sdata->local->hw.wiphy);
 860
 861         if (sta && pairwise) {
 862                 struct ieee80211_key *alt_key;
 863
 864                 old_key = wiphy_dereference(sdata->local->hw.wiphy,
 865                                             sta->ptk[idx]);
 866                 alt_key = wiphy_dereference(sdata->local->hw.wiphy,
 867                                             sta->ptk[idx ^ 1]);
 868
 869                 /* The rekey code assumes that the old and new key are using
 870                  * the same cipher. Enforce the assumption for pairwise keys.
 871                  */
 872                 if ((alt_key && alt_key->conf.cipher != key->conf.cipher) ||
 873                     (old_key && old_key->conf.cipher != key->conf.cipher)) {
 874                         ret = -EOPNOTSUPP;
 875                         goto out;
 876                 }
 877         } else if (sta) {
 878                 struct link_sta_info *link_sta = &sta->deflink;
 879                 int link_id = key->conf.link_id;
 880
 881                 if (link_id >= 0) {
 882                         link_sta = rcu_dereference_protected(sta->link[link_id],
 883                                                              lockdep_is_held(&sta->local->hw.wiphy->mtx));
 884                         if (!link_sta) {
 885                                 ret = -ENOLINK;
 886                                 goto out;
 887                         }
 888                 }
 889
 890                 old_key = wiphy_dereference(sdata->local->hw.wiphy,
 891                                             link_sta->gtk[idx]);
 892         } else {
 893                 if (idx < NUM_DEFAULT_KEYS)
 894                         old_key = wiphy_dereference(sdata->local->hw.wiphy,
 895                                                     sdata->keys[idx]);
 896                 if (!old_key)
 897                         old_key = wiphy_dereference(sdata->local->hw.wiphy,
 898                                                     link->gtk[idx]);
 899         }
 900
 901         /* Non-pairwise keys must also not switch the cipher on rekey */
 902         if (!pairwise) {
 903                 if (old_key && old_key->conf.cipher != key->conf.cipher) {
 904                         ret = -EOPNOTSUPP;
 905                         goto out;
 906                 }
 907         }
 908
 909         /*
 910          * Silently accept key re-installation without really installing the
 911          * new version of the key to avoid nonce reuse or replay issues.
 912          */
 913         if (ieee80211_key_identical(sdata, old_key, key)) {
 914                 ret = -EALREADY;
 915                 goto out;
 916         }
 917
 918         key->local = sdata->local;
 919         key->sdata = sdata;
 920         key->sta = sta;
 921
 922         /*
 923          * Assign a unique ID to every key so we can easily prevent mixed
 924          * key and fragment cache attacks.
 925          */
 926         key->color = atomic_inc_return(&key_color);
 927
 928         increment_tailroom_need_count(sdata);
 929
 930         ret = ieee80211_key_replace(sdata, link, sta, pairwise, old_key, key);
 931
 932         if (!ret) {
 933                 ieee80211_debugfs_key_add(key);
 934                 ieee80211_key_destroy(old_key, delay_tailroom);
 935         } else {
 936                 ieee80211_key_free(key, delay_tailroom);
 937         }
 938
 939         key = NULL;
 940
 941  out:
 942         ieee80211_key_free_unused(key);
 943         return ret;
 944 }
 945
 946 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
 947 {
 948         if (!key)
 949                 return;
 950
 951         /*
 952          * Replace key with nothingness if it was ever used.
 953          */
 954         if (key->sdata)
 955                 ieee80211_key_replace(key->sdata, NULL, key->sta,
 956                                       key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 957                                       key, NULL);
 958         ieee80211_key_destroy(key, delay_tailroom);
 959 }
 960
 961 void ieee80211_reenable_keys(struct ieee80211_sub_if_data *sdata)
 962 {
 963         struct ieee80211_key *key;
 964         struct ieee80211_sub_if_data *vlan;
 965
 966         lockdep_assert_wiphy(sdata->local->hw.wiphy);
 967
 968         sdata->crypto_tx_tailroom_needed_cnt = 0;
 969         sdata->crypto_tx_tailroom_pending_dec = 0;
 970
 971         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 972                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
 973                         vlan->crypto_tx_tailroom_needed_cnt = 0;
 974                         vlan->crypto_tx_tailroom_pending_dec = 0;
 975                 }
 976         }
 977
 978         if (ieee80211_sdata_running(sdata)) {
 979                 list_for_each_entry(key, &sdata->key_list, list) {
 980                         increment_tailroom_need_count(sdata);
 981                         ieee80211_key_enable_hw_accel(key);
 982                 }
 983         }
 984 }
 985
 986 void ieee80211_iter_keys(struct ieee80211_hw *hw,
 987                          struct ieee80211_vif *vif,
 988                          void (*iter)(struct ieee80211_hw *hw,
 989                                       struct ieee80211_vif *vif,
 990                                       struct ieee80211_sta *sta,
 991                                       struct ieee80211_key_conf *key,
 992                                       void *data),
 993                          void *iter_data)
 994 {
 995         struct ieee80211_local *local = hw_to_local(hw);
 996         struct ieee80211_key *key, *tmp;
 997         struct ieee80211_sub_if_data *sdata;
 998
 999         lockdep_assert_wiphy(hw->wiphy);
1000
1001         if (vif) {
1002                 sdata = vif_to_sdata(vif);
1003                 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
1004                         iter(hw, &sdata->vif,
1005                              key->sta ? &key->sta->sta : NULL,
1006                              &key->conf, iter_data);
1007         } else {
1008                 list_for_each_entry(sdata, &local->interfaces, list)
1009                         list_for_each_entry_safe(key, tmp,
1010                                                  &sdata->key_list, list)
1011                                 iter(hw, &sdata->vif,
1012                                      key->sta ? &key->sta->sta : NULL,
1013                                      &key->conf, iter_data);
1014         }
1015 }
1016 EXPORT_SYMBOL(ieee80211_iter_keys);
1017
1018 static void
1019 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
1020                          struct ieee80211_sub_if_data *sdata,
1021                          void (*iter)(struct ieee80211_hw *hw,
1022                                       struct ieee80211_vif *vif,
1023                                       struct ieee80211_sta *sta,
1024                                       struct ieee80211_key_conf *key,
1025                                       void *data),
1026                          void *iter_data)
1027 {
1028         struct ieee80211_key *key;
1029
1030         list_for_each_entry_rcu(key, &sdata->key_list, list) {
1031                 /* skip keys of station in removal process */
1032                 if (key->sta && key->sta->removed)
1033                         continue;
1034                 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1035                         continue;
1036
1037                 iter(hw, &sdata->vif,
1038                      key->sta ? &key->sta->sta : NULL,
1039                      &key->conf, iter_data);
1040         }
1041 }
1042
1043 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
1044                              struct ieee80211_vif *vif,
1045                              void (*iter)(struct ieee80211_hw *hw,
1046                                           struct ieee80211_vif *vif,
1047                                           struct ieee80211_sta *sta,
1048                                           struct ieee80211_key_conf *key,
1049                                           void *data),
1050                              void *iter_data)
1051 {
1052         struct ieee80211_local *local = hw_to_local(hw);
1053         struct ieee80211_sub_if_data *sdata;
1054
1055         if (vif) {
1056                 sdata = vif_to_sdata(vif);
1057                 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
1058         } else {
1059                 list_for_each_entry_rcu(sdata, &local->interfaces, list)
1060                         _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
1061         }
1062 }
1063 EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
1064
1065 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
1066                                       struct list_head *keys)
1067 {
1068         struct ieee80211_key *key, *tmp;
1069
1070         decrease_tailroom_need_count(sdata,
1071                                      sdata->crypto_tx_tailroom_pending_dec);
1072         sdata->crypto_tx_tailroom_pending_dec = 0;
1073
1074         ieee80211_debugfs_key_remove_mgmt_default(sdata);
1075         ieee80211_debugfs_key_remove_beacon_default(sdata);
1076
1077         list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
1078                 ieee80211_key_replace(key->sdata, NULL, key->sta,
1079                                       key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1080                                       key, NULL);
1081                 list_add_tail(&key->list, keys);
1082         }
1083
1084         ieee80211_debugfs_key_update_default(sdata);
1085 }
1086
1087 void ieee80211_remove_link_keys(struct ieee80211_link_data *link,
1088                                 struct list_head *keys)
1089 {
1090         struct ieee80211_sub_if_data *sdata = link->sdata;
1091         struct ieee80211_local *local = sdata->local;
1092         struct ieee80211_key *key, *tmp;
1093
1094         lockdep_assert_wiphy(local->hw.wiphy);
1095
1096         list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
1097                 if (key->conf.link_id != link->link_id)
1098                         continue;
1099                 ieee80211_key_replace(key->sdata, link, key->sta,
1100                                       key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1101                                       key, NULL);
1102                 list_add_tail(&key->list, keys);
1103         }
1104 }
1105
1106 void ieee80211_free_key_list(struct ieee80211_local *local,
1107                              struct list_head *keys)
1108 {
1109         struct ieee80211_key *key, *tmp;
1110
1111         lockdep_assert_wiphy(local->hw.wiphy);
1112
1113         list_for_each_entry_safe(key, tmp, keys, list)
1114                 __ieee80211_key_destroy(key, false);
1115 }
1116
1117 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
1118                          bool force_synchronize)
1119 {
1120         struct ieee80211_local *local = sdata->local;
1121         struct ieee80211_sub_if_data *vlan;
1122         struct ieee80211_sub_if_data *master;
1123         struct ieee80211_key *key, *tmp;
1124         LIST_HEAD(keys);
1125
1126         wiphy_delayed_work_cancel(local->hw.wiphy,
1127                                   &sdata->dec_tailroom_needed_wk);
1128
1129         lockdep_assert_wiphy(local->hw.wiphy);
1130
1131         ieee80211_free_keys_iface(sdata, &keys);
1132
1133         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1134                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1135                         ieee80211_free_keys_iface(vlan, &keys);
1136         }
1137
1138         if (!list_empty(&keys) || force_synchronize)
1139                 synchronize_net();
1140         list_for_each_entry_safe(key, tmp, &keys, list)
1141                 __ieee80211_key_destroy(key, false);
1142
1143         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1144                 if (sdata->bss) {
1145                         master = container_of(sdata->bss,
1146                                               struct ieee80211_sub_if_data,
1147                                               u.ap);
1148
1149                         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
1150                                      master->crypto_tx_tailroom_needed_cnt);
1151                 }
1152         } else {
1153                 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
1154                              sdata->crypto_tx_tailroom_pending_dec);
1155         }
1156
1157         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1158                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1159                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
1160                                      vlan->crypto_tx_tailroom_pending_dec);
1161         }
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         lockdep_assert_wiphy(local->hw.wiphy);
1171
1172         for (i = 0; i < ARRAY_SIZE(sta->deflink.gtk); i++) {
1173                 key = wiphy_dereference(local->hw.wiphy, sta->deflink.gtk[i]);
1174                 if (!key)
1175                         continue;
1176                 ieee80211_key_replace(key->sdata, NULL, key->sta,
1177                                       key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1178                                       key, NULL);
1179                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1180                                         NL80211_IFTYPE_STATION);
1181         }
1182
1183         for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1184                 key = wiphy_dereference(local->hw.wiphy, sta->ptk[i]);
1185                 if (!key)
1186                         continue;
1187                 ieee80211_key_replace(key->sdata, NULL, key->sta,
1188                                       key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1189                                       key, NULL);
1190                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1191                                         NL80211_IFTYPE_STATION);
1192         }
1193 }
1194
1195 void ieee80211_delayed_tailroom_dec(struct wiphy *wiphy,
1196                                     struct wiphy_work *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         decrease_tailroom_need_count(sdata,
1220                                      sdata->crypto_tx_tailroom_pending_dec);
1221         sdata->crypto_tx_tailroom_pending_dec = 0;
1222 }
1223
1224 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
1225                                 const u8 *replay_ctr, gfp_t gfp)
1226 {
1227         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1228
1229         trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
1230
1231         cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
1232 }
1233 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
1234
1235 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
1236                               int tid, struct ieee80211_key_seq *seq)
1237 {
1238         struct ieee80211_key *key;
1239         const u8 *pn;
1240
1241         key = container_of(keyconf, struct ieee80211_key, conf);
1242
1243         switch (key->conf.cipher) {
1244         case WLAN_CIPHER_SUITE_TKIP:
1245                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1246                         return;
1247                 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
1248                 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
1249                 break;
1250         case WLAN_CIPHER_SUITE_CCMP:
1251         case WLAN_CIPHER_SUITE_CCMP_256:
1252                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1253                         return;
1254                 if (tid < 0)
1255                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1256                 else
1257                         pn = key->u.ccmp.rx_pn[tid];
1258                 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
1259                 break;
1260         case WLAN_CIPHER_SUITE_AES_CMAC:
1261         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1262                 if (WARN_ON(tid != 0))
1263                         return;
1264                 pn = key->u.aes_cmac.rx_pn;
1265                 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
1266                 break;
1267         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1268         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1269                 if (WARN_ON(tid != 0))
1270                         return;
1271                 pn = key->u.aes_gmac.rx_pn;
1272                 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
1273                 break;
1274         case WLAN_CIPHER_SUITE_GCMP:
1275         case WLAN_CIPHER_SUITE_GCMP_256:
1276                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1277                         return;
1278                 if (tid < 0)
1279                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1280                 else
1281                         pn = key->u.gcmp.rx_pn[tid];
1282                 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
1283                 break;
1284         }
1285 }
1286 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
1287
1288 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1289                               int tid, struct ieee80211_key_seq *seq)
1290 {
1291         struct ieee80211_key *key;
1292         u8 *pn;
1293
1294         key = container_of(keyconf, struct ieee80211_key, conf);
1295
1296         switch (key->conf.cipher) {
1297         case WLAN_CIPHER_SUITE_TKIP:
1298                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1299                         return;
1300                 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1301                 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1302                 break;
1303         case WLAN_CIPHER_SUITE_CCMP:
1304         case WLAN_CIPHER_SUITE_CCMP_256:
1305                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1306                         return;
1307                 if (tid < 0)
1308                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1309                 else
1310                         pn = key->u.ccmp.rx_pn[tid];
1311                 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1312                 break;
1313         case WLAN_CIPHER_SUITE_AES_CMAC:
1314         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1315                 if (WARN_ON(tid != 0))
1316                         return;
1317                 pn = key->u.aes_cmac.rx_pn;
1318                 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1319                 break;
1320         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1321         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1322                 if (WARN_ON(tid != 0))
1323                         return;
1324                 pn = key->u.aes_gmac.rx_pn;
1325                 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1326                 break;
1327         case WLAN_CIPHER_SUITE_GCMP:
1328         case WLAN_CIPHER_SUITE_GCMP_256:
1329                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1330                         return;
1331                 if (tid < 0)
1332                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1333                 else
1334                         pn = key->u.gcmp.rx_pn[tid];
1335                 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1336                 break;
1337         default:
1338                 WARN_ON(1);
1339                 break;
1340         }
1341 }
1342 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1343
1344 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1345 {
1346         struct ieee80211_key *key;
1347
1348         key = container_of(keyconf, struct ieee80211_key, conf);
1349
1350         lockdep_assert_wiphy(key->local->hw.wiphy);
1351
1352         /*
1353          * if key was uploaded, we assume the driver will/has remove(d)
1354          * it, so adjust bookkeeping accordingly
1355          */
1356         if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1357                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1358
1359                 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
1360                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
1361                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1362                         increment_tailroom_need_count(key->sdata);
1363         }
1364
1365         ieee80211_key_free(key, false);
1366 }
1367 EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1368
1369 struct ieee80211_key_conf *
1370 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1371                         struct ieee80211_key_conf *keyconf)
1372 {
1373         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1374         struct ieee80211_local *local = sdata->local;
1375         struct ieee80211_key *key;
1376         int err;
1377
1378         if (WARN_ON(!local->wowlan))
1379                 return ERR_PTR(-EINVAL);
1380
1381         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1382                 return ERR_PTR(-EINVAL);
1383
1384         key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1385                                   keyconf->keylen, keyconf->key,
1386                                   0, NULL);
1387         if (IS_ERR(key))
1388                 return ERR_CAST(key);
1389
1390         if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1391                 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1392
1393         /* FIXME: this function needs to get a link ID */
1394         err = ieee80211_key_link(key, &sdata->deflink, NULL);
1395         if (err)
1396                 return ERR_PTR(err);
1397
1398         return &key->conf;
1399 }
1400 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);
1401
1402 void ieee80211_key_mic_failure(struct ieee80211_key_conf *keyconf)
1403 {
1404         struct ieee80211_key *key;
1405
1406         key = container_of(keyconf, struct ieee80211_key, conf);
1407
1408         switch (key->conf.cipher) {
1409         case WLAN_CIPHER_SUITE_AES_CMAC:
1410         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1411                 key->u.aes_cmac.icverrors++;
1412                 break;
1413         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1414         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1415                 key->u.aes_gmac.icverrors++;
1416                 break;
1417         default:
1418                 /* ignore the others for now, we don't keep counters now */
1419                 break;
1420         }
1421 }
1422 EXPORT_SYMBOL_GPL(ieee80211_key_mic_failure);
1423
1424 void ieee80211_key_replay(struct ieee80211_key_conf *keyconf)
1425 {
1426         struct ieee80211_key *key;
1427
1428         key = container_of(keyconf, struct ieee80211_key, conf);
1429
1430         switch (key->conf.cipher) {
1431         case WLAN_CIPHER_SUITE_CCMP:
1432         case WLAN_CIPHER_SUITE_CCMP_256:
1433                 key->u.ccmp.replays++;
1434                 break;
1435         case WLAN_CIPHER_SUITE_AES_CMAC:
1436         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1437                 key->u.aes_cmac.replays++;
1438                 break;
1439         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1440         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1441                 key->u.aes_gmac.replays++;
1442                 break;
1443         case WLAN_CIPHER_SUITE_GCMP:
1444         case WLAN_CIPHER_SUITE_GCMP_256:
1445                 key->u.gcmp.replays++;
1446                 break;
1447         }
1448 }
1449 EXPORT_SYMBOL_GPL(ieee80211_key_replay);
1450
1451 int ieee80211_key_switch_links(struct ieee80211_sub_if_data *sdata,
1452                                unsigned long del_links_mask,
1453                                unsigned long add_links_mask)
1454 {
1455         struct ieee80211_key *key;
1456         int ret;
1457
1458         list_for_each_entry(key, &sdata->key_list, list) {
1459                 if (key->conf.link_id < 0 ||
1460                     !(del_links_mask & BIT(key->conf.link_id)))
1461                         continue;
1462
1463                 /* shouldn't happen for per-link keys */
1464                 WARN_ON(key->sta);
1465
1466                 ieee80211_key_disable_hw_accel(key);
1467         }
1468
1469         list_for_each_entry(key, &sdata->key_list, list) {
1470                 if (key->conf.link_id < 0 ||
1471                     !(add_links_mask & BIT(key->conf.link_id)))
1472                         continue;
1473
1474                 /* shouldn't happen for per-link keys */
1475                 WARN_ON(key->sta);
1476
1477                 ret = ieee80211_key_enable_hw_accel(key);
1478                 if (ret)
1479                         return ret;
1480         }
1481
1482         return 0;
1483 }