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