net/mac80211/key.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2002-2005, Instant802 Networks, Inc.
   4  * Copyright 2005-2006, Devicescape Software, Inc.
   5  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   6  * Copyright 2007-2008  Johannes Berg <johannes@sipsolutions.net>
   7  * Copyright 2013-2014  Intel Mobile Communications GmbH
   8  * Copyright 2015-2017  Intel Deutschland GmbH
   9  * Copyright 2018-2020  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         ret = drv_set_key(key->local, SET_KEY, sdata,
 181                           sta ? &sta->sta : NULL, &key->conf);
 182
 183         if (!ret) {
 184                 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
 185
 186                 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
 187                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
 188                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 189                         decrease_tailroom_need_count(sdata, 1);
 190
 191                 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
 192                         (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
 193
 194                 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) &&
 195                         (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC));
 196
 197                 return 0;
 198         }
 199
 200         if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1)
 201                 sdata_err(sdata,
 202                           "failed to set key (%d, %pM) to hardware (%d)\n",
 203                           key->conf.keyidx,
 204                           sta ? sta->sta.addr : bcast_addr, ret);
 205
 206  out_unsupported:
 207         switch (key->conf.cipher) {
 208         case WLAN_CIPHER_SUITE_WEP40:
 209         case WLAN_CIPHER_SUITE_WEP104:
 210         case WLAN_CIPHER_SUITE_TKIP:
 211         case WLAN_CIPHER_SUITE_CCMP:
 212         case WLAN_CIPHER_SUITE_CCMP_256:
 213         case WLAN_CIPHER_SUITE_GCMP:
 214         case WLAN_CIPHER_SUITE_GCMP_256:
 215         case WLAN_CIPHER_SUITE_AES_CMAC:
 216         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 217         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 218         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 219                 /* all of these we can do in software - if driver can */
 220                 if (ret == 1)
 221                         return 0;
 222                 if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL))
 223                         return -EINVAL;
 224                 return 0;
 225         default:
 226                 return -EINVAL;
 227         }
 228 }
 229
 230 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
 231 {
 232         struct ieee80211_sub_if_data *sdata;
 233         struct sta_info *sta;
 234         int ret;
 235
 236         might_sleep();
 237
 238         if (!key || !key->local->ops->set_key)
 239                 return;
 240
 241         assert_key_lock(key->local);
 242
 243         if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 244                 return;
 245
 246         sta = key->sta;
 247         sdata = key->sdata;
 248
 249         if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
 250                                  IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
 251                                  IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
 252                 increment_tailroom_need_count(sdata);
 253
 254         key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 255         ret = drv_set_key(key->local, DISABLE_KEY, sdata,
 256                           sta ? &sta->sta : NULL, &key->conf);
 257
 258         if (ret)
 259                 sdata_err(sdata,
 260                           "failed to remove key (%d, %pM) from hardware (%d)\n",
 261                           key->conf.keyidx,
 262                           sta ? sta->sta.addr : bcast_addr, ret);
 263 }
 264
 265 static int _ieee80211_set_tx_key(struct ieee80211_key *key, bool force)
 266 {
 267         struct sta_info *sta = key->sta;
 268         struct ieee80211_local *local = key->local;
 269
 270         assert_key_lock(local);
 271
 272         set_sta_flag(sta, WLAN_STA_USES_ENCRYPTION);
 273
 274         sta->ptk_idx = key->conf.keyidx;
 275
 276         if (force || !ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT))
 277                 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
 278         ieee80211_check_fast_xmit(sta);
 279
 280         return 0;
 281 }
 282
 283 int ieee80211_set_tx_key(struct ieee80211_key *key)
 284 {
 285         return _ieee80211_set_tx_key(key, false);
 286 }
 287
 288 static void ieee80211_pairwise_rekey(struct ieee80211_key *old,
 289                                      struct ieee80211_key *new)
 290 {
 291         struct ieee80211_local *local = new->local;
 292         struct sta_info *sta = new->sta;
 293         int i;
 294
 295         assert_key_lock(local);
 296
 297         if (new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX) {
 298                 /* Extended Key ID key install, initial one or rekey */
 299
 300                 if (sta->ptk_idx != INVALID_PTK_KEYIDX &&
 301                     !ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT)) {
 302                         /* Aggregation Sessions with Extended Key ID must not
 303                          * mix MPDUs with different keyIDs within one A-MPDU.
 304                          * Tear down running Tx aggregation sessions and block
 305                          * new Rx/Tx aggregation requests during rekey to
 306                          * ensure there are no A-MPDUs when the driver is not
 307                          * supporting A-MPDU key borders. (Blocking Tx only
 308                          * would be sufficient but WLAN_STA_BLOCK_BA gets the
 309                          * job done for the few ms we need it.)
 310                          */
 311                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
 312                         mutex_lock(&sta->ampdu_mlme.mtx);
 313                         for (i = 0; i <  IEEE80211_NUM_TIDS; i++)
 314                                 ___ieee80211_stop_tx_ba_session(sta, i,
 315                                                                 AGG_STOP_LOCAL_REQUEST);
 316                         mutex_unlock(&sta->ampdu_mlme.mtx);
 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_sub_if_data *sdata,
 348                                         int idx, bool uni, bool multi)
 349 {
 350         struct ieee80211_key *key = NULL;
 351
 352         assert_key_lock(sdata->local);
 353
 354         if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
 355                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 356
 357         if (uni) {
 358                 rcu_assign_pointer(sdata->default_unicast_key, key);
 359                 ieee80211_check_fast_xmit_iface(sdata);
 360                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
 361                         drv_set_default_unicast_key(sdata->local, sdata, idx);
 362         }
 363
 364         if (multi)
 365                 rcu_assign_pointer(sdata->default_multicast_key, key);
 366
 367         ieee80211_debugfs_key_update_default(sdata);
 368 }
 369
 370 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
 371                                bool uni, bool multi)
 372 {
 373         mutex_lock(&sdata->local->key_mtx);
 374         __ieee80211_set_default_key(sdata, idx, uni, multi);
 375         mutex_unlock(&sdata->local->key_mtx);
 376 }
 377
 378 static void
 379 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
 380 {
 381         struct ieee80211_key *key = NULL;
 382
 383         assert_key_lock(sdata->local);
 384
 385         if (idx >= NUM_DEFAULT_KEYS &&
 386             idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
 387                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 388
 389         rcu_assign_pointer(sdata->default_mgmt_key, key);
 390
 391         ieee80211_debugfs_key_update_default(sdata);
 392 }
 393
 394 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
 395                                     int idx)
 396 {
 397         mutex_lock(&sdata->local->key_mtx);
 398         __ieee80211_set_default_mgmt_key(sdata, idx);
 399         mutex_unlock(&sdata->local->key_mtx);
 400 }
 401
 402 static void
 403 __ieee80211_set_default_beacon_key(struct ieee80211_sub_if_data *sdata, int idx)
 404 {
 405         struct ieee80211_key *key = NULL;
 406
 407         assert_key_lock(sdata->local);
 408
 409         if (idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS &&
 410             idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
 411             NUM_DEFAULT_BEACON_KEYS)
 412                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 413
 414         rcu_assign_pointer(sdata->default_beacon_key, key);
 415
 416         ieee80211_debugfs_key_update_default(sdata);
 417 }
 418
 419 void ieee80211_set_default_beacon_key(struct ieee80211_sub_if_data *sdata,
 420                                       int idx)
 421 {
 422         mutex_lock(&sdata->local->key_mtx);
 423         __ieee80211_set_default_beacon_key(sdata, idx);
 424         mutex_unlock(&sdata->local->key_mtx);
 425 }
 426
 427 static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
 428                                   struct sta_info *sta,
 429                                   bool pairwise,
 430                                   struct ieee80211_key *old,
 431                                   struct ieee80211_key *new)
 432 {
 433         int idx;
 434         int ret = 0;
 435         bool defunikey, defmultikey, defmgmtkey, defbeaconkey;
 436         bool is_wep;
 437
 438         /* caller must provide at least one old/new */
 439         if (WARN_ON(!new && !old))
 440                 return 0;
 441
 442         if (new) {
 443                 idx = new->conf.keyidx;
 444                 list_add_tail_rcu(&new->list, &sdata->key_list);
 445                 is_wep = new->conf.cipher == WLAN_CIPHER_SUITE_WEP40 ||
 446                          new->conf.cipher == WLAN_CIPHER_SUITE_WEP104;
 447         } else {
 448                 idx = old->conf.keyidx;
 449                 is_wep = old->conf.cipher == WLAN_CIPHER_SUITE_WEP40 ||
 450                          old->conf.cipher == WLAN_CIPHER_SUITE_WEP104;
 451         }
 452
 453         if ((is_wep || pairwise) && idx >= NUM_DEFAULT_KEYS)
 454                 return -EINVAL;
 455
 456         WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
 457
 458         if (new && sta && pairwise) {
 459                 /* Unicast rekey needs special handling. With Extended Key ID
 460                  * old is still NULL for the first rekey.
 461                  */
 462                 ieee80211_pairwise_rekey(old, new);
 463         }
 464
 465         if (old) {
 466                 if (old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
 467                         ieee80211_key_disable_hw_accel(old);
 468
 469                         if (new)
 470                                 ret = ieee80211_key_enable_hw_accel(new);
 471                 }
 472         } else {
 473                 if (!new->local->wowlan)
 474                         ret = ieee80211_key_enable_hw_accel(new);
 475         }
 476
 477         if (ret)
 478                 return ret;
 479
 480         if (sta) {
 481                 if (pairwise) {
 482                         rcu_assign_pointer(sta->ptk[idx], new);
 483                         if (new &&
 484                             !(new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX))
 485                                 _ieee80211_set_tx_key(new, true);
 486                 } else {
 487                         rcu_assign_pointer(sta->deflink.gtk[idx], new);
 488                 }
 489                 /* Only needed for transition from no key -> key.
 490                  * Still triggers unnecessary when using Extended Key ID
 491                  * and installing the second key ID the first time.
 492                  */
 493                 if (new && !old)
 494                         ieee80211_check_fast_rx(sta);
 495         } else {
 496                 defunikey = old &&
 497                         old == key_mtx_dereference(sdata->local,
 498                                                 sdata->default_unicast_key);
 499                 defmultikey = old &&
 500                         old == key_mtx_dereference(sdata->local,
 501                                                 sdata->default_multicast_key);
 502                 defmgmtkey = old &&
 503                         old == key_mtx_dereference(sdata->local,
 504                                                 sdata->default_mgmt_key);
 505                 defbeaconkey = old &&
 506                         old == key_mtx_dereference(sdata->local,
 507                                                    sdata->default_beacon_key);
 508
 509                 if (defunikey && !new)
 510                         __ieee80211_set_default_key(sdata, -1, true, false);
 511                 if (defmultikey && !new)
 512                         __ieee80211_set_default_key(sdata, -1, false, true);
 513                 if (defmgmtkey && !new)
 514                         __ieee80211_set_default_mgmt_key(sdata, -1);
 515                 if (defbeaconkey && !new)
 516                         __ieee80211_set_default_beacon_key(sdata, -1);
 517
 518                 rcu_assign_pointer(sdata->keys[idx], new);
 519                 if (defunikey && new)
 520                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 521                                                     true, false);
 522                 if (defmultikey && new)
 523                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
 524                                                     false, true);
 525                 if (defmgmtkey && new)
 526                         __ieee80211_set_default_mgmt_key(sdata,
 527                                                          new->conf.keyidx);
 528                 if (defbeaconkey && new)
 529                         __ieee80211_set_default_beacon_key(sdata,
 530                                                            new->conf.keyidx);
 531         }
 532
 533         if (old)
 534                 list_del_rcu(&old->list);
 535
 536         return 0;
 537 }
 538
 539 struct ieee80211_key *
 540 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
 541                     const u8 *key_data,
 542                     size_t seq_len, const u8 *seq,
 543                     const struct ieee80211_cipher_scheme *cs)
 544 {
 545         struct ieee80211_key *key;
 546         int i, j, err;
 547
 548         if (WARN_ON(idx < 0 ||
 549                     idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
 550                     NUM_DEFAULT_BEACON_KEYS))
 551                 return ERR_PTR(-EINVAL);
 552
 553         key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
 554         if (!key)
 555                 return ERR_PTR(-ENOMEM);
 556
 557         /*
 558          * Default to software encryption; we'll later upload the
 559          * key to the hardware if possible.
 560          */
 561         key->conf.flags = 0;
 562         key->flags = 0;
 563
 564         key->conf.cipher = cipher;
 565         key->conf.keyidx = idx;
 566         key->conf.keylen = key_len;
 567         switch (cipher) {
 568         case WLAN_CIPHER_SUITE_WEP40:
 569         case WLAN_CIPHER_SUITE_WEP104:
 570                 key->conf.iv_len = IEEE80211_WEP_IV_LEN;
 571                 key->conf.icv_len = IEEE80211_WEP_ICV_LEN;
 572                 break;
 573         case WLAN_CIPHER_SUITE_TKIP:
 574                 key->conf.iv_len = IEEE80211_TKIP_IV_LEN;
 575                 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN;
 576                 if (seq) {
 577                         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
 578                                 key->u.tkip.rx[i].iv32 =
 579                                         get_unaligned_le32(&seq[2]);
 580                                 key->u.tkip.rx[i].iv16 =
 581                                         get_unaligned_le16(seq);
 582                         }
 583                 }
 584                 spin_lock_init(&key->u.tkip.txlock);
 585                 break;
 586         case WLAN_CIPHER_SUITE_CCMP:
 587                 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN;
 588                 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN;
 589                 if (seq) {
 590                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 591                                 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++)
 592                                         key->u.ccmp.rx_pn[i][j] =
 593                                                 seq[IEEE80211_CCMP_PN_LEN - j - 1];
 594                 }
 595                 /*
 596                  * Initialize AES key state here as an optimization so that
 597                  * it does not need to be initialized for every packet.
 598                  */
 599                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 600                         key_data, key_len, IEEE80211_CCMP_MIC_LEN);
 601                 if (IS_ERR(key->u.ccmp.tfm)) {
 602                         err = PTR_ERR(key->u.ccmp.tfm);
 603                         kfree(key);
 604                         return ERR_PTR(err);
 605                 }
 606                 break;
 607         case WLAN_CIPHER_SUITE_CCMP_256:
 608                 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN;
 609                 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN;
 610                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 611                         for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++)
 612                                 key->u.ccmp.rx_pn[i][j] =
 613                                         seq[IEEE80211_CCMP_256_PN_LEN - j - 1];
 614                 /* Initialize AES key state here as an optimization so that
 615                  * it does not need to be initialized for every packet.
 616                  */
 617                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
 618                         key_data, key_len, IEEE80211_CCMP_256_MIC_LEN);
 619                 if (IS_ERR(key->u.ccmp.tfm)) {
 620                         err = PTR_ERR(key->u.ccmp.tfm);
 621                         kfree(key);
 622                         return ERR_PTR(err);
 623                 }
 624                 break;
 625         case WLAN_CIPHER_SUITE_AES_CMAC:
 626         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 627                 key->conf.iv_len = 0;
 628                 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
 629                         key->conf.icv_len = sizeof(struct ieee80211_mmie);
 630                 else
 631                         key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 632                 if (seq)
 633                         for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
 634                                 key->u.aes_cmac.rx_pn[j] =
 635                                         seq[IEEE80211_CMAC_PN_LEN - j - 1];
 636                 /*
 637                  * Initialize AES key state here as an optimization so that
 638                  * it does not need to be initialized for every packet.
 639                  */
 640                 key->u.aes_cmac.tfm =
 641                         ieee80211_aes_cmac_key_setup(key_data, key_len);
 642                 if (IS_ERR(key->u.aes_cmac.tfm)) {
 643                         err = PTR_ERR(key->u.aes_cmac.tfm);
 644                         kfree(key);
 645                         return ERR_PTR(err);
 646                 }
 647                 break;
 648         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 649         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 650                 key->conf.iv_len = 0;
 651                 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
 652                 if (seq)
 653                         for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++)
 654                                 key->u.aes_gmac.rx_pn[j] =
 655                                         seq[IEEE80211_GMAC_PN_LEN - j - 1];
 656                 /* Initialize AES key state here as an optimization so that
 657                  * it does not need to be initialized for every packet.
 658                  */
 659                 key->u.aes_gmac.tfm =
 660                         ieee80211_aes_gmac_key_setup(key_data, key_len);
 661                 if (IS_ERR(key->u.aes_gmac.tfm)) {
 662                         err = PTR_ERR(key->u.aes_gmac.tfm);
 663                         kfree(key);
 664                         return ERR_PTR(err);
 665                 }
 666                 break;
 667         case WLAN_CIPHER_SUITE_GCMP:
 668         case WLAN_CIPHER_SUITE_GCMP_256:
 669                 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
 670                 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
 671                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
 672                         for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
 673                                 key->u.gcmp.rx_pn[i][j] =
 674                                         seq[IEEE80211_GCMP_PN_LEN - j - 1];
 675                 /* Initialize AES key state here as an optimization so that
 676                  * it does not need to be initialized for every packet.
 677                  */
 678                 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
 679                                                                       key_len);
 680                 if (IS_ERR(key->u.gcmp.tfm)) {
 681                         err = PTR_ERR(key->u.gcmp.tfm);
 682                         kfree(key);
 683                         return ERR_PTR(err);
 684                 }
 685                 break;
 686         default:
 687                 if (cs) {
 688                         if (seq_len && seq_len != cs->pn_len) {
 689                                 kfree(key);
 690                                 return ERR_PTR(-EINVAL);
 691                         }
 692
 693                         key->conf.iv_len = cs->hdr_len;
 694                         key->conf.icv_len = cs->mic_len;
 695                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
 696                                 for (j = 0; j < seq_len; j++)
 697                                         key->u.gen.rx_pn[i][j] =
 698                                                         seq[seq_len - j - 1];
 699                         key->flags |= KEY_FLAG_CIPHER_SCHEME;
 700                 }
 701         }
 702         memcpy(key->conf.key, key_data, key_len);
 703         INIT_LIST_HEAD(&key->list);
 704
 705         return key;
 706 }
 707
 708 static void ieee80211_key_free_common(struct ieee80211_key *key)
 709 {
 710         switch (key->conf.cipher) {
 711         case WLAN_CIPHER_SUITE_CCMP:
 712         case WLAN_CIPHER_SUITE_CCMP_256:
 713                 ieee80211_aes_key_free(key->u.ccmp.tfm);
 714                 break;
 715         case WLAN_CIPHER_SUITE_AES_CMAC:
 716         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 717                 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
 718                 break;
 719         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 720         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 721                 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm);
 722                 break;
 723         case WLAN_CIPHER_SUITE_GCMP:
 724         case WLAN_CIPHER_SUITE_GCMP_256:
 725                 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
 726                 break;
 727         }
 728         kfree_sensitive(key);
 729 }
 730
 731 static void __ieee80211_key_destroy(struct ieee80211_key *key,
 732                                     bool delay_tailroom)
 733 {
 734         if (key->local) {
 735                 struct ieee80211_sub_if_data *sdata = key->sdata;
 736
 737                 ieee80211_debugfs_key_remove(key);
 738
 739                 if (delay_tailroom) {
 740                         /* see ieee80211_delayed_tailroom_dec */
 741                         sdata->crypto_tx_tailroom_pending_dec++;
 742                         schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
 743                                               HZ/2);
 744                 } else {
 745                         decrease_tailroom_need_count(sdata, 1);
 746                 }
 747         }
 748
 749         ieee80211_key_free_common(key);
 750 }
 751
 752 static void ieee80211_key_destroy(struct ieee80211_key *key,
 753                                   bool delay_tailroom)
 754 {
 755         if (!key)
 756                 return;
 757
 758         /*
 759          * Synchronize so the TX path and rcu key iterators
 760          * can no longer be using this key before we free/remove it.
 761          */
 762         synchronize_net();
 763
 764         __ieee80211_key_destroy(key, delay_tailroom);
 765 }
 766
 767 void ieee80211_key_free_unused(struct ieee80211_key *key)
 768 {
 769         WARN_ON(key->sdata || key->local);
 770         ieee80211_key_free_common(key);
 771 }
 772
 773 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata,
 774                                     struct ieee80211_key *old,
 775                                     struct ieee80211_key *new)
 776 {
 777         u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP];
 778         u8 *tk_old, *tk_new;
 779
 780         if (!old || new->conf.keylen != old->conf.keylen)
 781                 return false;
 782
 783         tk_old = old->conf.key;
 784         tk_new = new->conf.key;
 785
 786         /*
 787          * In station mode, don't compare the TX MIC key, as it's never used
 788          * and offloaded rekeying may not care to send it to the host. This
 789          * is the case in iwlwifi, for example.
 790          */
 791         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 792             new->conf.cipher == WLAN_CIPHER_SUITE_TKIP &&
 793             new->conf.keylen == WLAN_KEY_LEN_TKIP &&
 794             !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
 795                 memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP);
 796                 memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP);
 797                 memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 798                 memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
 799                 tk_old = tkip_old;
 800                 tk_new = tkip_new;
 801         }
 802
 803         return !crypto_memneq(tk_old, tk_new, new->conf.keylen);
 804 }
 805
 806 int ieee80211_key_link(struct ieee80211_key *key,
 807                        struct ieee80211_sub_if_data *sdata,
 808                        struct sta_info *sta)
 809 {
 810         static atomic_t key_color = ATOMIC_INIT(0);
 811         struct ieee80211_key *old_key;
 812         int idx = key->conf.keyidx;
 813         bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
 814         /*
 815          * We want to delay tailroom updates only for station - in that
 816          * case it helps roaming speed, but in other cases it hurts and
 817          * can cause warnings to appear.
 818          */
 819         bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION;
 820         int ret = -EOPNOTSUPP;
 821
 822         mutex_lock(&sdata->local->key_mtx);
 823
 824         if (sta && pairwise) {
 825                 struct ieee80211_key *alt_key;
 826
 827                 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
 828                 alt_key = key_mtx_dereference(sdata->local, sta->ptk[idx ^ 1]);
 829
 830                 /* The rekey code assumes that the old and new key are using
 831                  * the same cipher. Enforce the assumption for pairwise keys.
 832                  */
 833                 if ((alt_key && alt_key->conf.cipher != key->conf.cipher) ||
 834                     (old_key && old_key->conf.cipher != key->conf.cipher))
 835                         goto out;
 836         } else if (sta) {
 837                 old_key = key_mtx_dereference(sdata->local,
 838                                               sta->deflink.gtk[idx]);
 839         } else {
 840                 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 841         }
 842
 843         /* Non-pairwise keys must also not switch the cipher on rekey */
 844         if (!pairwise) {
 845                 if (old_key && old_key->conf.cipher != key->conf.cipher)
 846                         goto out;
 847         }
 848
 849         /*
 850          * Silently accept key re-installation without really installing the
 851          * new version of the key to avoid nonce reuse or replay issues.
 852          */
 853         if (ieee80211_key_identical(sdata, old_key, key)) {
 854                 ieee80211_key_free_unused(key);
 855                 ret = 0;
 856                 goto out;
 857         }
 858
 859         key->local = sdata->local;
 860         key->sdata = sdata;
 861         key->sta = sta;
 862
 863         /*
 864          * Assign a unique ID to every key so we can easily prevent mixed
 865          * key and fragment cache attacks.
 866          */
 867         key->color = atomic_inc_return(&key_color);
 868
 869         increment_tailroom_need_count(sdata);
 870
 871         ret = ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
 872
 873         if (!ret) {
 874                 ieee80211_debugfs_key_add(key);
 875                 ieee80211_key_destroy(old_key, delay_tailroom);
 876         } else {
 877                 ieee80211_key_free(key, delay_tailroom);
 878         }
 879
 880  out:
 881         mutex_unlock(&sdata->local->key_mtx);
 882
 883         return ret;
 884 }
 885
 886 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
 887 {
 888         if (!key)
 889                 return;
 890
 891         /*
 892          * Replace key with nothingness if it was ever used.
 893          */
 894         if (key->sdata)
 895                 ieee80211_key_replace(key->sdata, key->sta,
 896                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
 897                                 key, NULL);
 898         ieee80211_key_destroy(key, delay_tailroom);
 899 }
 900
 901 void ieee80211_reenable_keys(struct ieee80211_sub_if_data *sdata)
 902 {
 903         struct ieee80211_key *key;
 904         struct ieee80211_sub_if_data *vlan;
 905
 906         lockdep_assert_wiphy(sdata->local->hw.wiphy);
 907
 908         mutex_lock(&sdata->local->key_mtx);
 909
 910         sdata->crypto_tx_tailroom_needed_cnt = 0;
 911         sdata->crypto_tx_tailroom_pending_dec = 0;
 912
 913         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 914                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
 915                         vlan->crypto_tx_tailroom_needed_cnt = 0;
 916                         vlan->crypto_tx_tailroom_pending_dec = 0;
 917                 }
 918         }
 919
 920         if (ieee80211_sdata_running(sdata)) {
 921                 list_for_each_entry(key, &sdata->key_list, list) {
 922                         increment_tailroom_need_count(sdata);
 923                         ieee80211_key_enable_hw_accel(key);
 924                 }
 925         }
 926
 927         mutex_unlock(&sdata->local->key_mtx);
 928 }
 929
 930 void ieee80211_iter_keys(struct ieee80211_hw *hw,
 931                          struct ieee80211_vif *vif,
 932                          void (*iter)(struct ieee80211_hw *hw,
 933                                       struct ieee80211_vif *vif,
 934                                       struct ieee80211_sta *sta,
 935                                       struct ieee80211_key_conf *key,
 936                                       void *data),
 937                          void *iter_data)
 938 {
 939         struct ieee80211_local *local = hw_to_local(hw);
 940         struct ieee80211_key *key, *tmp;
 941         struct ieee80211_sub_if_data *sdata;
 942
 943         lockdep_assert_wiphy(hw->wiphy);
 944
 945         mutex_lock(&local->key_mtx);
 946         if (vif) {
 947                 sdata = vif_to_sdata(vif);
 948                 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
 949                         iter(hw, &sdata->vif,
 950                              key->sta ? &key->sta->sta : NULL,
 951                              &key->conf, iter_data);
 952         } else {
 953                 list_for_each_entry(sdata, &local->interfaces, list)
 954                         list_for_each_entry_safe(key, tmp,
 955                                                  &sdata->key_list, list)
 956                                 iter(hw, &sdata->vif,
 957                                      key->sta ? &key->sta->sta : NULL,
 958                                      &key->conf, iter_data);
 959         }
 960         mutex_unlock(&local->key_mtx);
 961 }
 962 EXPORT_SYMBOL(ieee80211_iter_keys);
 963
 964 static void
 965 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
 966                          struct ieee80211_sub_if_data *sdata,
 967                          void (*iter)(struct ieee80211_hw *hw,
 968                                       struct ieee80211_vif *vif,
 969                                       struct ieee80211_sta *sta,
 970                                       struct ieee80211_key_conf *key,
 971                                       void *data),
 972                          void *iter_data)
 973 {
 974         struct ieee80211_key *key;
 975
 976         list_for_each_entry_rcu(key, &sdata->key_list, list) {
 977                 /* skip keys of station in removal process */
 978                 if (key->sta && key->sta->removed)
 979                         continue;
 980                 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 981                         continue;
 982
 983                 iter(hw, &sdata->vif,
 984                      key->sta ? &key->sta->sta : NULL,
 985                      &key->conf, iter_data);
 986         }
 987 }
 988
 989 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
 990                              struct ieee80211_vif *vif,
 991                              void (*iter)(struct ieee80211_hw *hw,
 992                                           struct ieee80211_vif *vif,
 993                                           struct ieee80211_sta *sta,
 994                                           struct ieee80211_key_conf *key,
 995                                           void *data),
 996                              void *iter_data)
 997 {
 998         struct ieee80211_local *local = hw_to_local(hw);
 999         struct ieee80211_sub_if_data *sdata;
1000
1001         if (vif) {
1002                 sdata = vif_to_sdata(vif);
1003                 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
1004         } else {
1005                 list_for_each_entry_rcu(sdata, &local->interfaces, list)
1006                         _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
1007         }
1008 }
1009 EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
1010
1011 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
1012                                       struct list_head *keys)
1013 {
1014         struct ieee80211_key *key, *tmp;
1015
1016         decrease_tailroom_need_count(sdata,
1017                                      sdata->crypto_tx_tailroom_pending_dec);
1018         sdata->crypto_tx_tailroom_pending_dec = 0;
1019
1020         ieee80211_debugfs_key_remove_mgmt_default(sdata);
1021         ieee80211_debugfs_key_remove_beacon_default(sdata);
1022
1023         list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
1024                 ieee80211_key_replace(key->sdata, key->sta,
1025                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1026                                 key, NULL);
1027                 list_add_tail(&key->list, keys);
1028         }
1029
1030         ieee80211_debugfs_key_update_default(sdata);
1031 }
1032
1033 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
1034                          bool force_synchronize)
1035 {
1036         struct ieee80211_local *local = sdata->local;
1037         struct ieee80211_sub_if_data *vlan;
1038         struct ieee80211_sub_if_data *master;
1039         struct ieee80211_key *key, *tmp;
1040         LIST_HEAD(keys);
1041
1042         cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
1043
1044         mutex_lock(&local->key_mtx);
1045
1046         ieee80211_free_keys_iface(sdata, &keys);
1047
1048         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1049                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1050                         ieee80211_free_keys_iface(vlan, &keys);
1051         }
1052
1053         if (!list_empty(&keys) || force_synchronize)
1054                 synchronize_net();
1055         list_for_each_entry_safe(key, tmp, &keys, list)
1056                 __ieee80211_key_destroy(key, false);
1057
1058         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1059                 if (sdata->bss) {
1060                         master = container_of(sdata->bss,
1061                                               struct ieee80211_sub_if_data,
1062                                               u.ap);
1063
1064                         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
1065                                      master->crypto_tx_tailroom_needed_cnt);
1066                 }
1067         } else {
1068                 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
1069                              sdata->crypto_tx_tailroom_pending_dec);
1070         }
1071
1072         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1073                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1074                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
1075                                      vlan->crypto_tx_tailroom_pending_dec);
1076         }
1077
1078         mutex_unlock(&local->key_mtx);
1079 }
1080
1081 void ieee80211_free_sta_keys(struct ieee80211_local *local,
1082                              struct sta_info *sta)
1083 {
1084         struct ieee80211_key *key;
1085         int i;
1086
1087         mutex_lock(&local->key_mtx);
1088         for (i = 0; i < ARRAY_SIZE(sta->deflink.gtk); i++) {
1089                 key = key_mtx_dereference(local, sta->deflink.gtk[i]);
1090                 if (!key)
1091                         continue;
1092                 ieee80211_key_replace(key->sdata, key->sta,
1093                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1094                                 key, NULL);
1095                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1096                                         NL80211_IFTYPE_STATION);
1097         }
1098
1099         for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1100                 key = key_mtx_dereference(local, sta->ptk[i]);
1101                 if (!key)
1102                         continue;
1103                 ieee80211_key_replace(key->sdata, key->sta,
1104                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1105                                 key, NULL);
1106                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1107                                         NL80211_IFTYPE_STATION);
1108         }
1109
1110         mutex_unlock(&local->key_mtx);
1111 }
1112
1113 void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
1114 {
1115         struct ieee80211_sub_if_data *sdata;
1116
1117         sdata = container_of(wk, struct ieee80211_sub_if_data,
1118                              dec_tailroom_needed_wk.work);
1119
1120         /*
1121          * The reason for the delayed tailroom needed decrementing is to
1122          * make roaming faster: during roaming, all keys are first deleted
1123          * and then new keys are installed. The first new key causes the
1124          * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
1125          * the cost of synchronize_net() (which can be slow). Avoid this
1126          * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
1127          * key removal for a while, so if we roam the value is larger than
1128          * zero and no 0->1 transition happens.
1129          *
1130          * The cost is that if the AP switching was from an AP with keys
1131          * to one without, we still allocate tailroom while it would no
1132          * longer be needed. However, in the typical (fast) roaming case
1133          * within an ESS this usually won't happen.
1134          */
1135
1136         mutex_lock(&sdata->local->key_mtx);
1137         decrease_tailroom_need_count(sdata,
1138                                      sdata->crypto_tx_tailroom_pending_dec);
1139         sdata->crypto_tx_tailroom_pending_dec = 0;
1140         mutex_unlock(&sdata->local->key_mtx);
1141 }
1142
1143 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
1144                                 const u8 *replay_ctr, gfp_t gfp)
1145 {
1146         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1147
1148         trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
1149
1150         cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
1151 }
1152 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
1153
1154 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
1155                               int tid, struct ieee80211_key_seq *seq)
1156 {
1157         struct ieee80211_key *key;
1158         const u8 *pn;
1159
1160         key = container_of(keyconf, struct ieee80211_key, conf);
1161
1162         switch (key->conf.cipher) {
1163         case WLAN_CIPHER_SUITE_TKIP:
1164                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1165                         return;
1166                 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
1167                 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
1168                 break;
1169         case WLAN_CIPHER_SUITE_CCMP:
1170         case WLAN_CIPHER_SUITE_CCMP_256:
1171                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1172                         return;
1173                 if (tid < 0)
1174                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1175                 else
1176                         pn = key->u.ccmp.rx_pn[tid];
1177                 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
1178                 break;
1179         case WLAN_CIPHER_SUITE_AES_CMAC:
1180         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1181                 if (WARN_ON(tid != 0))
1182                         return;
1183                 pn = key->u.aes_cmac.rx_pn;
1184                 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
1185                 break;
1186         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1187         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1188                 if (WARN_ON(tid != 0))
1189                         return;
1190                 pn = key->u.aes_gmac.rx_pn;
1191                 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
1192                 break;
1193         case WLAN_CIPHER_SUITE_GCMP:
1194         case WLAN_CIPHER_SUITE_GCMP_256:
1195                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1196                         return;
1197                 if (tid < 0)
1198                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1199                 else
1200                         pn = key->u.gcmp.rx_pn[tid];
1201                 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
1202                 break;
1203         }
1204 }
1205 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
1206
1207 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1208                               int tid, struct ieee80211_key_seq *seq)
1209 {
1210         struct ieee80211_key *key;
1211         u8 *pn;
1212
1213         key = container_of(keyconf, struct ieee80211_key, conf);
1214
1215         switch (key->conf.cipher) {
1216         case WLAN_CIPHER_SUITE_TKIP:
1217                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1218                         return;
1219                 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1220                 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1221                 break;
1222         case WLAN_CIPHER_SUITE_CCMP:
1223         case WLAN_CIPHER_SUITE_CCMP_256:
1224                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1225                         return;
1226                 if (tid < 0)
1227                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1228                 else
1229                         pn = key->u.ccmp.rx_pn[tid];
1230                 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1231                 break;
1232         case WLAN_CIPHER_SUITE_AES_CMAC:
1233         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1234                 if (WARN_ON(tid != 0))
1235                         return;
1236                 pn = key->u.aes_cmac.rx_pn;
1237                 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1238                 break;
1239         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1240         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1241                 if (WARN_ON(tid != 0))
1242                         return;
1243                 pn = key->u.aes_gmac.rx_pn;
1244                 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1245                 break;
1246         case WLAN_CIPHER_SUITE_GCMP:
1247         case WLAN_CIPHER_SUITE_GCMP_256:
1248                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1249                         return;
1250                 if (tid < 0)
1251                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1252                 else
1253                         pn = key->u.gcmp.rx_pn[tid];
1254                 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1255                 break;
1256         default:
1257                 WARN_ON(1);
1258                 break;
1259         }
1260 }
1261 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1262
1263 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1264 {
1265         struct ieee80211_key *key;
1266
1267         key = container_of(keyconf, struct ieee80211_key, conf);
1268
1269         assert_key_lock(key->local);
1270
1271         /*
1272          * if key was uploaded, we assume the driver will/has remove(d)
1273          * it, so adjust bookkeeping accordingly
1274          */
1275         if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1276                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1277
1278                 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
1279                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
1280                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1281                         increment_tailroom_need_count(key->sdata);
1282         }
1283
1284         ieee80211_key_free(key, false);
1285 }
1286 EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1287
1288 struct ieee80211_key_conf *
1289 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1290                         struct ieee80211_key_conf *keyconf)
1291 {
1292         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1293         struct ieee80211_local *local = sdata->local;
1294         struct ieee80211_key *key;
1295         int err;
1296
1297         if (WARN_ON(!local->wowlan))
1298                 return ERR_PTR(-EINVAL);
1299
1300         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1301                 return ERR_PTR(-EINVAL);
1302
1303         key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1304                                   keyconf->keylen, keyconf->key,
1305                                   0, NULL, NULL);
1306         if (IS_ERR(key))
1307                 return ERR_CAST(key);
1308
1309         if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1310                 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1311
1312         err = ieee80211_key_link(key, sdata, NULL);
1313         if (err)
1314                 return ERR_PTR(err);
1315
1316         return &key->conf;
1317 }
1318 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);
1319
1320 void ieee80211_key_mic_failure(struct ieee80211_key_conf *keyconf)
1321 {
1322         struct ieee80211_key *key;
1323
1324         key = container_of(keyconf, struct ieee80211_key, conf);
1325
1326         switch (key->conf.cipher) {
1327         case WLAN_CIPHER_SUITE_AES_CMAC:
1328         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1329                 key->u.aes_cmac.icverrors++;
1330                 break;
1331         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1332         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1333                 key->u.aes_gmac.icverrors++;
1334                 break;
1335         default:
1336                 /* ignore the others for now, we don't keep counters now */
1337                 break;
1338         }
1339 }
1340 EXPORT_SYMBOL_GPL(ieee80211_key_mic_failure);
1341
1342 void ieee80211_key_replay(struct ieee80211_key_conf *keyconf)
1343 {
1344         struct ieee80211_key *key;
1345
1346         key = container_of(keyconf, struct ieee80211_key, conf);
1347
1348         switch (key->conf.cipher) {
1349         case WLAN_CIPHER_SUITE_CCMP:
1350         case WLAN_CIPHER_SUITE_CCMP_256:
1351                 key->u.ccmp.replays++;
1352                 break;
1353         case WLAN_CIPHER_SUITE_AES_CMAC:
1354         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1355                 key->u.aes_cmac.replays++;
1356                 break;
1357         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1358         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1359                 key->u.aes_gmac.replays++;
1360                 break;
1361         case WLAN_CIPHER_SUITE_GCMP:
1362         case WLAN_CIPHER_SUITE_GCMP_256:
1363                 key->u.gcmp.replays++;
1364                 break;
1365         }
1366 }
1367 EXPORT_SYMBOL_GPL(ieee80211_key_replay);