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  Intel Corporation
  10  */
  11
  12 #include <linux/if_ether.h>
  13 #include <linux/etherdevice.h>
  14 #include <linux/list.h>
  15 #include <linux/rcupdate.h>
  16 #include <linux/rtnetlink.h>
  17 #include <linux/slab.h>
  18 #include <linux/export.h>
  19 #include <net/mac80211.h>
  20 #include <crypto/algapi.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         }
 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 == key_mtx_dereference(sdata->local,
 541                                                 sdata->default_unicast_key);
 542                 defmultikey = old &&
 543                         old == key_mtx_dereference(sdata->local,
 544                                                    link->default_multicast_key);
 545                 defmgmtkey = old &&
 546                         old == key_mtx_dereference(sdata->local,
 547                                                    link->default_mgmt_key);
 548                 defbeaconkey = old &&
 549                         old == key_mtx_dereference(sdata->local,
 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                         schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
 775                                               HZ/2);
 776                 } else {
 777                         decrease_tailroom_need_count(sdata, 1);
 778                 }
 779         }
 780
 781         ieee80211_key_free_common(key);
 782 }
 783
 784 static void ieee80211_key_destroy(struct ieee80211_key *key,
 785                                   bool delay_tailroom)
 786 {
 787         if (!key)
 788                 return;
 789
 790         /*
 791          * Synchronize so the TX path and rcu key iterators
 792          * can no longer be using this key before we free/remove it.
 793          */
 794         synchronize_net();
 795
 796         __ieee80211_key_destroy(key, delay_tailroom);
 797 }
 798
 799 void ieee80211_key_free_unused(struct ieee80211_key *key)
 800 {
 801         WARN_ON(key->sdata || key->local);
 802         ieee80211_key_free_common(key);
 803 }
 804
 805 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata,
 806                                     struct ieee80211_key *old,
 807                                     struct ieee80211_key *new)
 808 {
 809         u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP];
 810         u8 *tk_old, *tk_new;
 811
 812         if (!old || new->conf.keylen != old->conf.keylen)
 813                 return false;
 814
 815         tk_old = old->conf.key;
 816         tk_new = new->conf.key;
 817
 818         /*
 819          * In station mode, don't compare the TX MIC key, as it's never used
 820          * and offloaded rekeying may not care to send it to the host. This
 821          * is the case in iwlwifi, for example.
 822          */
 823         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 824             new->conf.cipher == WLAN_CIPHER_SUITE_TKIP &&
 825             new->conf.keylen == WLAN_KEY_LEN_TKIP &&
 826             !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
 827                 memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP);
 828                 memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP);
 829                 memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 830                 memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 831                 tk_old = tkip_old;
 832                 tk_new = tkip_new;
 833         }
 834
 835         return !crypto_memneq(tk_old, tk_new, new->conf.keylen);
 836 }
 837
 838 int ieee80211_key_link(struct ieee80211_key *key,
 839                        struct ieee80211_link_data *link,
 840                        struct sta_info *sta)
 841 {
 842         struct ieee80211_sub_if_data *sdata = link->sdata;
 843         static atomic_t key_color = ATOMIC_INIT(0);
 844         struct ieee80211_key *old_key = NULL;
 845         int idx = key->conf.keyidx;
 846         bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
 847         /*
 848          * We want to delay tailroom updates only for station - in that
 849          * case it helps roaming speed, but in other cases it hurts and
 850          * can cause warnings to appear.
 851          */
 852         bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION;
 853         int ret = -EOPNOTSUPP;
 854
 855         mutex_lock(&sdata->local->key_mtx);
 856
 857         if (sta && pairwise) {
 858                 struct ieee80211_key *alt_key;
 859
 860                 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
 861                 alt_key = key_mtx_dereference(sdata->local, sta->ptk[idx ^ 1]);
 862
 863                 /* The rekey code assumes that the old and new key are using
 864                  * the same cipher. Enforce the assumption for pairwise keys.
 865                  */
 866                 if ((alt_key && alt_key->conf.cipher != key->conf.cipher) ||
 867                     (old_key && old_key->conf.cipher != key->conf.cipher))
 868                         goto out;
 869         } else if (sta) {
 870                 struct link_sta_info *link_sta = &sta->deflink;
 871                 int link_id = key->conf.link_id;
 872
 873                 if (link_id >= 0) {
 874                         link_sta = rcu_dereference_protected(sta->link[link_id],
 875                                                              lockdep_is_held(&sta->local->sta_mtx));
 876                         if (!link_sta) {
 877                                 ret = -ENOLINK;
 878                                 goto out;
 879                         }
 880                 }
 881
 882                 old_key = key_mtx_dereference(sdata->local, link_sta->gtk[idx]);
 883         } else {
 884                 if (idx < NUM_DEFAULT_KEYS)
 885                         old_key = key_mtx_dereference(sdata->local,
 886                                                       sdata->keys[idx]);
 887                 if (!old_key)
 888                         old_key = key_mtx_dereference(sdata->local,
 889                                                       link->gtk[idx]);
 890         }
 891
 892         /* Non-pairwise keys must also not switch the cipher on rekey */
 893         if (!pairwise) {
 894                 if (old_key && old_key->conf.cipher != key->conf.cipher)
 895                         goto out;
 896         }
 897
 898         /*
 899          * Silently accept key re-installation without really installing the
 900          * new version of the key to avoid nonce reuse or replay issues.
 901          */
 902         if (ieee80211_key_identical(sdata, old_key, key)) {
 903                 ieee80211_key_free_unused(key);
 904                 ret = -EALREADY;
 905                 goto out;
 906         }
 907
 908         key->local = sdata->local;
 909         key->sdata = sdata;
 910         key->sta = sta;
 911
 912         /*
 913          * Assign a unique ID to every key so we can easily prevent mixed
 914          * key and fragment cache attacks.
 915          */
 916         key->color = atomic_inc_return(&key_color);
 917
 918         increment_tailroom_need_count(sdata);
 919
 920         ret = ieee80211_key_replace(sdata, link, sta, pairwise, old_key, key);
 921
 922         if (!ret) {
 923                 ieee80211_debugfs_key_add(key);
 924                 ieee80211_key_destroy(old_key, delay_tailroom);
 925         } else {
 926                 ieee80211_key_free(key, delay_tailroom);
 927         }
 928
 929  out:
 930         mutex_unlock(&sdata->local->key_mtx);
 931
 932         return ret;
 933 }
 934
 935 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
 936 {
 937         if (!key)
 938                 return;
 939
 940         /*
 941          * Replace key with nothingness if it was ever used.
 942          */
 943         if (key->sdata)
 944                 ieee80211_key_replace(key->sdata, NULL, key->sta,
 945                                       key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 946                                       key, NULL);
 947         ieee80211_key_destroy(key, delay_tailroom);
 948 }
 949
 950 void ieee80211_reenable_keys(struct ieee80211_sub_if_data *sdata)
 951 {
 952         struct ieee80211_key *key;
 953         struct ieee80211_sub_if_data *vlan;
 954
 955         lockdep_assert_wiphy(sdata->local->hw.wiphy);
 956
 957         mutex_lock(&sdata->local->key_mtx);
 958
 959         sdata->crypto_tx_tailroom_needed_cnt = 0;
 960         sdata->crypto_tx_tailroom_pending_dec = 0;
 961
 962         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 963                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
 964                         vlan->crypto_tx_tailroom_needed_cnt = 0;
 965                         vlan->crypto_tx_tailroom_pending_dec = 0;
 966                 }
 967         }
 968
 969         if (ieee80211_sdata_running(sdata)) {
 970                 list_for_each_entry(key, &sdata->key_list, list) {
 971                         increment_tailroom_need_count(sdata);
 972                         ieee80211_key_enable_hw_accel(key);
 973                 }
 974         }
 975
 976         mutex_unlock(&sdata->local->key_mtx);
 977 }
 978
 979 void ieee80211_iter_keys(struct ieee80211_hw *hw,
 980                          struct ieee80211_vif *vif,
 981                          void (*iter)(struct ieee80211_hw *hw,
 982                                       struct ieee80211_vif *vif,
 983                                       struct ieee80211_sta *sta,
 984                                       struct ieee80211_key_conf *key,
 985                                       void *data),
 986                          void *iter_data)
 987 {
 988         struct ieee80211_local *local = hw_to_local(hw);
 989         struct ieee80211_key *key, *tmp;
 990         struct ieee80211_sub_if_data *sdata;
 991
 992         lockdep_assert_wiphy(hw->wiphy);
 993
 994         mutex_lock(&local->key_mtx);
 995         if (vif) {
 996                 sdata = vif_to_sdata(vif);
 997                 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
 998                         iter(hw, &sdata->vif,
 999                              key->sta ? &key->sta->sta : NULL,
1000                              &key->conf, iter_data);
1001         } else {
1002                 list_for_each_entry(sdata, &local->interfaces, list)
1003                         list_for_each_entry_safe(key, tmp,
1004                                                  &sdata->key_list, list)
1005                                 iter(hw, &sdata->vif,
1006                                      key->sta ? &key->sta->sta : NULL,
1007                                      &key->conf, iter_data);
1008         }
1009         mutex_unlock(&local->key_mtx);
1010 }
1011 EXPORT_SYMBOL(ieee80211_iter_keys);
1012
1013 static void
1014 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
1015                          struct ieee80211_sub_if_data *sdata,
1016                          void (*iter)(struct ieee80211_hw *hw,
1017                                       struct ieee80211_vif *vif,
1018                                       struct ieee80211_sta *sta,
1019                                       struct ieee80211_key_conf *key,
1020                                       void *data),
1021                          void *iter_data)
1022 {
1023         struct ieee80211_key *key;
1024
1025         list_for_each_entry_rcu(key, &sdata->key_list, list) {
1026                 /* skip keys of station in removal process */
1027                 if (key->sta && key->sta->removed)
1028                         continue;
1029                 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1030                         continue;
1031
1032                 iter(hw, &sdata->vif,
1033                      key->sta ? &key->sta->sta : NULL,
1034                      &key->conf, iter_data);
1035         }
1036 }
1037
1038 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
1039                              struct ieee80211_vif *vif,
1040                              void (*iter)(struct ieee80211_hw *hw,
1041                                           struct ieee80211_vif *vif,
1042                                           struct ieee80211_sta *sta,
1043                                           struct ieee80211_key_conf *key,
1044                                           void *data),
1045                              void *iter_data)
1046 {
1047         struct ieee80211_local *local = hw_to_local(hw);
1048         struct ieee80211_sub_if_data *sdata;
1049
1050         if (vif) {
1051                 sdata = vif_to_sdata(vif);
1052                 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
1053         } else {
1054                 list_for_each_entry_rcu(sdata, &local->interfaces, list)
1055                         _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
1056         }
1057 }
1058 EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
1059
1060 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
1061                                       struct list_head *keys)
1062 {
1063         struct ieee80211_key *key, *tmp;
1064
1065         decrease_tailroom_need_count(sdata,
1066                                      sdata->crypto_tx_tailroom_pending_dec);
1067         sdata->crypto_tx_tailroom_pending_dec = 0;
1068
1069         ieee80211_debugfs_key_remove_mgmt_default(sdata);
1070         ieee80211_debugfs_key_remove_beacon_default(sdata);
1071
1072         list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
1073                 ieee80211_key_replace(key->sdata, NULL, key->sta,
1074                                       key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1075                                       key, NULL);
1076                 list_add_tail(&key->list, keys);
1077         }
1078
1079         ieee80211_debugfs_key_update_default(sdata);
1080 }
1081
1082 void ieee80211_remove_link_keys(struct ieee80211_link_data *link,
1083                                 struct list_head *keys)
1084 {
1085         struct ieee80211_sub_if_data *sdata = link->sdata;
1086         struct ieee80211_local *local = sdata->local;
1087         struct ieee80211_key *key, *tmp;
1088
1089         mutex_lock(&local->key_mtx);
1090         list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
1091                 if (key->conf.link_id != link->link_id)
1092                         continue;
1093                 ieee80211_key_replace(key->sdata, link, key->sta,
1094                                       key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1095                                       key, NULL);
1096                 list_add_tail(&key->list, keys);
1097         }
1098         mutex_unlock(&local->key_mtx);
1099 }
1100
1101 void ieee80211_free_key_list(struct ieee80211_local *local,
1102                              struct list_head *keys)
1103 {
1104         struct ieee80211_key *key, *tmp;
1105
1106         mutex_lock(&local->key_mtx);
1107         list_for_each_entry_safe(key, tmp, keys, list)
1108                 __ieee80211_key_destroy(key, false);
1109         mutex_unlock(&local->key_mtx);
1110 }
1111
1112 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
1113                          bool force_synchronize)
1114 {
1115         struct ieee80211_local *local = sdata->local;
1116         struct ieee80211_sub_if_data *vlan;
1117         struct ieee80211_sub_if_data *master;
1118         struct ieee80211_key *key, *tmp;
1119         LIST_HEAD(keys);
1120
1121         cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
1122
1123         mutex_lock(&local->key_mtx);
1124
1125         ieee80211_free_keys_iface(sdata, &keys);
1126
1127         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1128                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1129                         ieee80211_free_keys_iface(vlan, &keys);
1130         }
1131
1132         if (!list_empty(&keys) || force_synchronize)
1133                 synchronize_net();
1134         list_for_each_entry_safe(key, tmp, &keys, list)
1135                 __ieee80211_key_destroy(key, false);
1136
1137         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1138                 if (sdata->bss) {
1139                         master = container_of(sdata->bss,
1140                                               struct ieee80211_sub_if_data,
1141                                               u.ap);
1142
1143                         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
1144                                      master->crypto_tx_tailroom_needed_cnt);
1145                 }
1146         } else {
1147                 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
1148                              sdata->crypto_tx_tailroom_pending_dec);
1149         }
1150
1151         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1152                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1153                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
1154                                      vlan->crypto_tx_tailroom_pending_dec);
1155         }
1156
1157         mutex_unlock(&local->key_mtx);
1158 }
1159
1160 void ieee80211_free_sta_keys(struct ieee80211_local *local,
1161                              struct sta_info *sta)
1162 {
1163         struct ieee80211_key *key;
1164         int i;
1165
1166         mutex_lock(&local->key_mtx);
1167         for (i = 0; i < ARRAY_SIZE(sta->deflink.gtk); i++) {
1168                 key = key_mtx_dereference(local, sta->deflink.gtk[i]);
1169                 if (!key)
1170                         continue;
1171                 ieee80211_key_replace(key->sdata, NULL, key->sta,
1172                                       key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1173                                       key, NULL);
1174                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1175                                         NL80211_IFTYPE_STATION);
1176         }
1177
1178         for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1179                 key = key_mtx_dereference(local, sta->ptk[i]);
1180                 if (!key)
1181                         continue;
1182                 ieee80211_key_replace(key->sdata, NULL, key->sta,
1183                                       key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1184                                       key, NULL);
1185                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1186                                         NL80211_IFTYPE_STATION);
1187         }
1188
1189         mutex_unlock(&local->key_mtx);
1190 }
1191
1192 void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
1193 {
1194         struct ieee80211_sub_if_data *sdata;
1195
1196         sdata = container_of(wk, struct ieee80211_sub_if_data,
1197                              dec_tailroom_needed_wk.work);
1198
1199         /*
1200          * The reason for the delayed tailroom needed decrementing is to
1201          * make roaming faster: during roaming, all keys are first deleted
1202          * and then new keys are installed. The first new key causes the
1203          * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
1204          * the cost of synchronize_net() (which can be slow). Avoid this
1205          * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
1206          * key removal for a while, so if we roam the value is larger than
1207          * zero and no 0->1 transition happens.
1208          *
1209          * The cost is that if the AP switching was from an AP with keys
1210          * to one without, we still allocate tailroom while it would no
1211          * longer be needed. However, in the typical (fast) roaming case
1212          * within an ESS this usually won't happen.
1213          */
1214
1215         mutex_lock(&sdata->local->key_mtx);
1216         decrease_tailroom_need_count(sdata,
1217                                      sdata->crypto_tx_tailroom_pending_dec);
1218         sdata->crypto_tx_tailroom_pending_dec = 0;
1219         mutex_unlock(&sdata->local->key_mtx);
1220 }
1221
1222 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
1223                                 const u8 *replay_ctr, gfp_t gfp)
1224 {
1225         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1226
1227         trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
1228
1229         cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
1230 }
1231 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
1232
1233 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
1234                               int tid, struct ieee80211_key_seq *seq)
1235 {
1236         struct ieee80211_key *key;
1237         const u8 *pn;
1238
1239         key = container_of(keyconf, struct ieee80211_key, conf);
1240
1241         switch (key->conf.cipher) {
1242         case WLAN_CIPHER_SUITE_TKIP:
1243                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1244                         return;
1245                 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
1246                 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
1247                 break;
1248         case WLAN_CIPHER_SUITE_CCMP:
1249         case WLAN_CIPHER_SUITE_CCMP_256:
1250                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1251                         return;
1252                 if (tid < 0)
1253                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1254                 else
1255                         pn = key->u.ccmp.rx_pn[tid];
1256                 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
1257                 break;
1258         case WLAN_CIPHER_SUITE_AES_CMAC:
1259         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1260                 if (WARN_ON(tid != 0))
1261                         return;
1262                 pn = key->u.aes_cmac.rx_pn;
1263                 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
1264                 break;
1265         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1266         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1267                 if (WARN_ON(tid != 0))
1268                         return;
1269                 pn = key->u.aes_gmac.rx_pn;
1270                 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
1271                 break;
1272         case WLAN_CIPHER_SUITE_GCMP:
1273         case WLAN_CIPHER_SUITE_GCMP_256:
1274                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1275                         return;
1276                 if (tid < 0)
1277                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1278                 else
1279                         pn = key->u.gcmp.rx_pn[tid];
1280                 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
1281                 break;
1282         }
1283 }
1284 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
1285
1286 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1287                               int tid, struct ieee80211_key_seq *seq)
1288 {
1289         struct ieee80211_key *key;
1290         u8 *pn;
1291
1292         key = container_of(keyconf, struct ieee80211_key, conf);
1293
1294         switch (key->conf.cipher) {
1295         case WLAN_CIPHER_SUITE_TKIP:
1296                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1297                         return;
1298                 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1299                 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1300                 break;
1301         case WLAN_CIPHER_SUITE_CCMP:
1302         case WLAN_CIPHER_SUITE_CCMP_256:
1303                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1304                         return;
1305                 if (tid < 0)
1306                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1307                 else
1308                         pn = key->u.ccmp.rx_pn[tid];
1309                 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1310                 break;
1311         case WLAN_CIPHER_SUITE_AES_CMAC:
1312         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1313                 if (WARN_ON(tid != 0))
1314                         return;
1315                 pn = key->u.aes_cmac.rx_pn;
1316                 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1317                 break;
1318         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1319         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1320                 if (WARN_ON(tid != 0))
1321                         return;
1322                 pn = key->u.aes_gmac.rx_pn;
1323                 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1324                 break;
1325         case WLAN_CIPHER_SUITE_GCMP:
1326         case WLAN_CIPHER_SUITE_GCMP_256:
1327                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1328                         return;
1329                 if (tid < 0)
1330                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1331                 else
1332                         pn = key->u.gcmp.rx_pn[tid];
1333                 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1334                 break;
1335         default:
1336                 WARN_ON(1);
1337                 break;
1338         }
1339 }
1340 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1341
1342 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1343 {
1344         struct ieee80211_key *key;
1345
1346         key = container_of(keyconf, struct ieee80211_key, conf);
1347
1348         assert_key_lock(key->local);
1349
1350         /*
1351          * if key was uploaded, we assume the driver will/has remove(d)
1352          * it, so adjust bookkeeping accordingly
1353          */
1354         if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1355                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1356
1357                 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
1358                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
1359                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1360                         increment_tailroom_need_count(key->sdata);
1361         }
1362
1363         ieee80211_key_free(key, false);
1364 }
1365 EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1366
1367 struct ieee80211_key_conf *
1368 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1369                         struct ieee80211_key_conf *keyconf)
1370 {
1371         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1372         struct ieee80211_local *local = sdata->local;
1373         struct ieee80211_key *key;
1374         int err;
1375
1376         if (WARN_ON(!local->wowlan))
1377                 return ERR_PTR(-EINVAL);
1378
1379         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1380                 return ERR_PTR(-EINVAL);
1381
1382         key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1383                                   keyconf->keylen, keyconf->key,
1384                                   0, NULL);
1385         if (IS_ERR(key))
1386                 return ERR_CAST(key);
1387
1388         if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1389                 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1390
1391         /* FIXME: this function needs to get a link ID */
1392         err = ieee80211_key_link(key, &sdata->deflink, NULL);
1393         if (err)
1394                 return ERR_PTR(err);
1395
1396         return &key->conf;
1397 }
1398 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);
1399
1400 void ieee80211_key_mic_failure(struct ieee80211_key_conf *keyconf)
1401 {
1402         struct ieee80211_key *key;
1403
1404         key = container_of(keyconf, struct ieee80211_key, conf);
1405
1406         switch (key->conf.cipher) {
1407         case WLAN_CIPHER_SUITE_AES_CMAC:
1408         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1409                 key->u.aes_cmac.icverrors++;
1410                 break;
1411         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1412         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1413                 key->u.aes_gmac.icverrors++;
1414                 break;
1415         default:
1416                 /* ignore the others for now, we don't keep counters now */
1417                 break;
1418         }
1419 }
1420 EXPORT_SYMBOL_GPL(ieee80211_key_mic_failure);
1421
1422 void ieee80211_key_replay(struct ieee80211_key_conf *keyconf)
1423 {
1424         struct ieee80211_key *key;
1425
1426         key = container_of(keyconf, struct ieee80211_key, conf);
1427
1428         switch (key->conf.cipher) {
1429         case WLAN_CIPHER_SUITE_CCMP:
1430         case WLAN_CIPHER_SUITE_CCMP_256:
1431                 key->u.ccmp.replays++;
1432                 break;
1433         case WLAN_CIPHER_SUITE_AES_CMAC:
1434         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1435                 key->u.aes_cmac.replays++;
1436                 break;
1437         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1438         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1439                 key->u.aes_gmac.replays++;
1440                 break;
1441         case WLAN_CIPHER_SUITE_GCMP:
1442         case WLAN_CIPHER_SUITE_GCMP_256:
1443                 key->u.gcmp.replays++;
1444                 break;
1445         }
1446 }
1447 EXPORT_SYMBOL_GPL(ieee80211_key_replay);
1448
1449 int ieee80211_key_switch_links(struct ieee80211_sub_if_data *sdata,
1450                                unsigned long del_links_mask,
1451                                unsigned long add_links_mask)
1452 {
1453         struct ieee80211_key *key;
1454         int ret;
1455
1456         list_for_each_entry(key, &sdata->key_list, list) {
1457                 if (key->conf.link_id < 0 ||
1458                     !(del_links_mask & BIT(key->conf.link_id)))
1459                         continue;
1460
1461                 /* shouldn't happen for per-link keys */
1462                 WARN_ON(key->sta);
1463
1464                 ieee80211_key_disable_hw_accel(key);
1465         }
1466
1467         list_for_each_entry(key, &sdata->key_list, list) {
1468                 if (key->conf.link_id < 0 ||
1469                     !(add_links_mask & BIT(key->conf.link_id)))
1470                         continue;
1471
1472                 /* shouldn't happen for per-link keys */
1473                 WARN_ON(key->sta);
1474
1475                 ret = ieee80211_key_enable_hw_accel(key);
1476                 if (ret)
1477                         return ret;
1478         }
1479
1480         return 0;
1481 }