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_AES_CMAC: 214 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 215 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 216 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 217 case WLAN_CIPHER_SUITE_GCMP: 218 case WLAN_CIPHER_SUITE_GCMP_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 int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, 403 struct sta_info *sta, 404 bool pairwise, 405 struct ieee80211_key *old, 406 struct ieee80211_key *new) 407 { 408 int idx; 409 int ret = 0; 410 bool defunikey, defmultikey, defmgmtkey; 411 412 /* caller must provide at least one old/new */ 413 if (WARN_ON(!new && !old)) 414 return 0; 415 416 if (new) 417 list_add_tail_rcu(&new->list, &sdata->key_list); 418 419 WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx); 420 421 if (new && sta && pairwise) { 422 /* Unicast rekey needs special handling. With Extended Key ID 423 * old is still NULL for the first rekey. 424 */ 425 ieee80211_pairwise_rekey(old, new); 426 } 427 428 if (old) { 429 idx = old->conf.keyidx; 430 431 if (old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { 432 ieee80211_key_disable_hw_accel(old); 433 434 if (new) 435 ret = ieee80211_key_enable_hw_accel(new); 436 } 437 } else { 438 /* new must be provided in case old is not */ 439 idx = new->conf.keyidx; 440 if (!new->local->wowlan) 441 ret = ieee80211_key_enable_hw_accel(new); 442 } 443 444 if (ret) 445 return ret; 446 447 if (sta) { 448 if (pairwise) { 449 rcu_assign_pointer(sta->ptk[idx], new); 450 if (new && 451 !(new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX)) 452 _ieee80211_set_tx_key(new, true); 453 } else { 454 rcu_assign_pointer(sta->gtk[idx], new); 455 } 456 /* Only needed for transition from no key -> key. 457 * Still triggers unnecessary when using Extended Key ID 458 * and installing the second key ID the first time. 459 */ 460 if (new && !old) 461 ieee80211_check_fast_rx(sta); 462 } else { 463 defunikey = old && 464 old == key_mtx_dereference(sdata->local, 465 sdata->default_unicast_key); 466 defmultikey = old && 467 old == key_mtx_dereference(sdata->local, 468 sdata->default_multicast_key); 469 defmgmtkey = old && 470 old == key_mtx_dereference(sdata->local, 471 sdata->default_mgmt_key); 472 473 if (defunikey && !new) 474 __ieee80211_set_default_key(sdata, -1, true, false); 475 if (defmultikey && !new) 476 __ieee80211_set_default_key(sdata, -1, false, true); 477 if (defmgmtkey && !new) 478 __ieee80211_set_default_mgmt_key(sdata, -1); 479 480 rcu_assign_pointer(sdata->keys[idx], new); 481 if (defunikey && new) 482 __ieee80211_set_default_key(sdata, new->conf.keyidx, 483 true, false); 484 if (defmultikey && new) 485 __ieee80211_set_default_key(sdata, new->conf.keyidx, 486 false, true); 487 if (defmgmtkey && new) 488 __ieee80211_set_default_mgmt_key(sdata, 489 new->conf.keyidx); 490 } 491 492 if (old) 493 list_del_rcu(&old->list); 494 495 return 0; 496 } 497 498 struct ieee80211_key * 499 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, 500 const u8 *key_data, 501 size_t seq_len, const u8 *seq, 502 const struct ieee80211_cipher_scheme *cs) 503 { 504 struct ieee80211_key *key; 505 int i, j, err; 506 507 if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)) 508 return ERR_PTR(-EINVAL); 509 510 key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); 511 if (!key) 512 return ERR_PTR(-ENOMEM); 513 514 /* 515 * Default to software encryption; we'll later upload the 516 * key to the hardware if possible. 517 */ 518 key->conf.flags = 0; 519 key->flags = 0; 520 521 key->conf.cipher = cipher; 522 key->conf.keyidx = idx; 523 key->conf.keylen = key_len; 524 switch (cipher) { 525 case WLAN_CIPHER_SUITE_WEP40: 526 case WLAN_CIPHER_SUITE_WEP104: 527 key->conf.iv_len = IEEE80211_WEP_IV_LEN; 528 key->conf.icv_len = IEEE80211_WEP_ICV_LEN; 529 break; 530 case WLAN_CIPHER_SUITE_TKIP: 531 key->conf.iv_len = IEEE80211_TKIP_IV_LEN; 532 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN; 533 if (seq) { 534 for (i = 0; i < IEEE80211_NUM_TIDS; i++) { 535 key->u.tkip.rx[i].iv32 = 536 get_unaligned_le32(&seq[2]); 537 key->u.tkip.rx[i].iv16 = 538 get_unaligned_le16(seq); 539 } 540 } 541 spin_lock_init(&key->u.tkip.txlock); 542 break; 543 case WLAN_CIPHER_SUITE_CCMP: 544 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN; 545 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN; 546 if (seq) { 547 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) 548 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++) 549 key->u.ccmp.rx_pn[i][j] = 550 seq[IEEE80211_CCMP_PN_LEN - j - 1]; 551 } 552 /* 553 * Initialize AES key state here as an optimization so that 554 * it does not need to be initialized for every packet. 555 */ 556 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt( 557 key_data, key_len, IEEE80211_CCMP_MIC_LEN); 558 if (IS_ERR(key->u.ccmp.tfm)) { 559 err = PTR_ERR(key->u.ccmp.tfm); 560 kfree(key); 561 return ERR_PTR(err); 562 } 563 break; 564 case WLAN_CIPHER_SUITE_CCMP_256: 565 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN; 566 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN; 567 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++) 568 for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++) 569 key->u.ccmp.rx_pn[i][j] = 570 seq[IEEE80211_CCMP_256_PN_LEN - j - 1]; 571 /* Initialize AES key state here as an optimization so that 572 * it does not need to be initialized for every packet. 573 */ 574 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt( 575 key_data, key_len, IEEE80211_CCMP_256_MIC_LEN); 576 if (IS_ERR(key->u.ccmp.tfm)) { 577 err = PTR_ERR(key->u.ccmp.tfm); 578 kfree(key); 579 return ERR_PTR(err); 580 } 581 break; 582 case WLAN_CIPHER_SUITE_AES_CMAC: 583 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 584 key->conf.iv_len = 0; 585 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC) 586 key->conf.icv_len = sizeof(struct ieee80211_mmie); 587 else 588 key->conf.icv_len = sizeof(struct ieee80211_mmie_16); 589 if (seq) 590 for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++) 591 key->u.aes_cmac.rx_pn[j] = 592 seq[IEEE80211_CMAC_PN_LEN - j - 1]; 593 /* 594 * Initialize AES key state here as an optimization so that 595 * it does not need to be initialized for every packet. 596 */ 597 key->u.aes_cmac.tfm = 598 ieee80211_aes_cmac_key_setup(key_data, key_len); 599 if (IS_ERR(key->u.aes_cmac.tfm)) { 600 err = PTR_ERR(key->u.aes_cmac.tfm); 601 kfree(key); 602 return ERR_PTR(err); 603 } 604 break; 605 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 606 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 607 key->conf.iv_len = 0; 608 key->conf.icv_len = sizeof(struct ieee80211_mmie_16); 609 if (seq) 610 for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++) 611 key->u.aes_gmac.rx_pn[j] = 612 seq[IEEE80211_GMAC_PN_LEN - j - 1]; 613 /* Initialize AES key state here as an optimization so that 614 * it does not need to be initialized for every packet. 615 */ 616 key->u.aes_gmac.tfm = 617 ieee80211_aes_gmac_key_setup(key_data, key_len); 618 if (IS_ERR(key->u.aes_gmac.tfm)) { 619 err = PTR_ERR(key->u.aes_gmac.tfm); 620 kfree(key); 621 return ERR_PTR(err); 622 } 623 break; 624 case WLAN_CIPHER_SUITE_GCMP: 625 case WLAN_CIPHER_SUITE_GCMP_256: 626 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN; 627 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN; 628 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++) 629 for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++) 630 key->u.gcmp.rx_pn[i][j] = 631 seq[IEEE80211_GCMP_PN_LEN - j - 1]; 632 /* Initialize AES key state here as an optimization so that 633 * it does not need to be initialized for every packet. 634 */ 635 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data, 636 key_len); 637 if (IS_ERR(key->u.gcmp.tfm)) { 638 err = PTR_ERR(key->u.gcmp.tfm); 639 kfree(key); 640 return ERR_PTR(err); 641 } 642 break; 643 default: 644 if (cs) { 645 if (seq_len && seq_len != cs->pn_len) { 646 kfree(key); 647 return ERR_PTR(-EINVAL); 648 } 649 650 key->conf.iv_len = cs->hdr_len; 651 key->conf.icv_len = cs->mic_len; 652 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) 653 for (j = 0; j < seq_len; j++) 654 key->u.gen.rx_pn[i][j] = 655 seq[seq_len - j - 1]; 656 key->flags |= KEY_FLAG_CIPHER_SCHEME; 657 } 658 } 659 memcpy(key->conf.key, key_data, key_len); 660 INIT_LIST_HEAD(&key->list); 661 662 return key; 663 } 664 665 static void ieee80211_key_free_common(struct ieee80211_key *key) 666 { 667 switch (key->conf.cipher) { 668 case WLAN_CIPHER_SUITE_CCMP: 669 case WLAN_CIPHER_SUITE_CCMP_256: 670 ieee80211_aes_key_free(key->u.ccmp.tfm); 671 break; 672 case WLAN_CIPHER_SUITE_AES_CMAC: 673 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 674 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); 675 break; 676 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 677 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 678 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm); 679 break; 680 case WLAN_CIPHER_SUITE_GCMP: 681 case WLAN_CIPHER_SUITE_GCMP_256: 682 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm); 683 break; 684 } 685 kzfree(key); 686 } 687 688 static void __ieee80211_key_destroy(struct ieee80211_key *key, 689 bool delay_tailroom) 690 { 691 if (key->local) { 692 struct ieee80211_sub_if_data *sdata = key->sdata; 693 694 ieee80211_debugfs_key_remove(key); 695 696 if (delay_tailroom) { 697 /* see ieee80211_delayed_tailroom_dec */ 698 sdata->crypto_tx_tailroom_pending_dec++; 699 schedule_delayed_work(&sdata->dec_tailroom_needed_wk, 700 HZ/2); 701 } else { 702 decrease_tailroom_need_count(sdata, 1); 703 } 704 } 705 706 ieee80211_key_free_common(key); 707 } 708 709 static void ieee80211_key_destroy(struct ieee80211_key *key, 710 bool delay_tailroom) 711 { 712 if (!key) 713 return; 714 715 /* 716 * Synchronize so the TX path and rcu key iterators 717 * can no longer be using this key before we free/remove it. 718 */ 719 synchronize_net(); 720 721 __ieee80211_key_destroy(key, delay_tailroom); 722 } 723 724 void ieee80211_key_free_unused(struct ieee80211_key *key) 725 { 726 WARN_ON(key->sdata || key->local); 727 ieee80211_key_free_common(key); 728 } 729 730 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata, 731 struct ieee80211_key *old, 732 struct ieee80211_key *new) 733 { 734 u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP]; 735 u8 *tk_old, *tk_new; 736 737 if (!old || new->conf.keylen != old->conf.keylen) 738 return false; 739 740 tk_old = old->conf.key; 741 tk_new = new->conf.key; 742 743 /* 744 * In station mode, don't compare the TX MIC key, as it's never used 745 * and offloaded rekeying may not care to send it to the host. This 746 * is the case in iwlwifi, for example. 747 */ 748 if (sdata->vif.type == NL80211_IFTYPE_STATION && 749 new->conf.cipher == WLAN_CIPHER_SUITE_TKIP && 750 new->conf.keylen == WLAN_KEY_LEN_TKIP && 751 !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) { 752 memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP); 753 memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP); 754 memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8); 755 memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8); 756 tk_old = tkip_old; 757 tk_new = tkip_new; 758 } 759 760 return !crypto_memneq(tk_old, tk_new, new->conf.keylen); 761 } 762 763 int ieee80211_key_link(struct ieee80211_key *key, 764 struct ieee80211_sub_if_data *sdata, 765 struct sta_info *sta) 766 { 767 struct ieee80211_key *old_key; 768 int idx = key->conf.keyidx; 769 bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE; 770 /* 771 * We want to delay tailroom updates only for station - in that 772 * case it helps roaming speed, but in other cases it hurts and 773 * can cause warnings to appear. 774 */ 775 bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION; 776 int ret = -EOPNOTSUPP; 777 778 mutex_lock(&sdata->local->key_mtx); 779 780 if (sta && pairwise) { 781 struct ieee80211_key *alt_key; 782 783 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]); 784 alt_key = key_mtx_dereference(sdata->local, sta->ptk[idx ^ 1]); 785 786 /* The rekey code assumes that the old and new key are using 787 * the same cipher. Enforce the assumption for pairwise keys. 788 */ 789 if ((alt_key && alt_key->conf.cipher != key->conf.cipher) || 790 (old_key && old_key->conf.cipher != key->conf.cipher)) 791 goto out; 792 } else if (sta) { 793 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]); 794 } else { 795 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]); 796 } 797 798 /* Non-pairwise keys must also not switch the cipher on rekey */ 799 if (!pairwise) { 800 if (old_key && old_key->conf.cipher != key->conf.cipher) 801 goto out; 802 } 803 804 /* 805 * Silently accept key re-installation without really installing the 806 * new version of the key to avoid nonce reuse or replay issues. 807 */ 808 if (ieee80211_key_identical(sdata, old_key, key)) { 809 ieee80211_key_free_unused(key); 810 ret = 0; 811 goto out; 812 } 813 814 key->local = sdata->local; 815 key->sdata = sdata; 816 key->sta = sta; 817 818 increment_tailroom_need_count(sdata); 819 820 ret = ieee80211_key_replace(sdata, sta, pairwise, old_key, key); 821 822 if (!ret) { 823 ieee80211_debugfs_key_add(key); 824 ieee80211_key_destroy(old_key, delay_tailroom); 825 } else { 826 ieee80211_key_free(key, delay_tailroom); 827 } 828 829 out: 830 mutex_unlock(&sdata->local->key_mtx); 831 832 return ret; 833 } 834 835 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom) 836 { 837 if (!key) 838 return; 839 840 /* 841 * Replace key with nothingness if it was ever used. 842 */ 843 if (key->sdata) 844 ieee80211_key_replace(key->sdata, key->sta, 845 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 846 key, NULL); 847 ieee80211_key_destroy(key, delay_tailroom); 848 } 849 850 void ieee80211_reenable_keys(struct ieee80211_sub_if_data *sdata) 851 { 852 struct ieee80211_key *key; 853 struct ieee80211_sub_if_data *vlan; 854 855 ASSERT_RTNL(); 856 857 mutex_lock(&sdata->local->key_mtx); 858 859 sdata->crypto_tx_tailroom_needed_cnt = 0; 860 sdata->crypto_tx_tailroom_pending_dec = 0; 861 862 if (sdata->vif.type == NL80211_IFTYPE_AP) { 863 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) { 864 vlan->crypto_tx_tailroom_needed_cnt = 0; 865 vlan->crypto_tx_tailroom_pending_dec = 0; 866 } 867 } 868 869 if (ieee80211_sdata_running(sdata)) { 870 list_for_each_entry(key, &sdata->key_list, list) { 871 increment_tailroom_need_count(sdata); 872 ieee80211_key_enable_hw_accel(key); 873 } 874 } 875 876 mutex_unlock(&sdata->local->key_mtx); 877 } 878 879 void ieee80211_iter_keys(struct ieee80211_hw *hw, 880 struct ieee80211_vif *vif, 881 void (*iter)(struct ieee80211_hw *hw, 882 struct ieee80211_vif *vif, 883 struct ieee80211_sta *sta, 884 struct ieee80211_key_conf *key, 885 void *data), 886 void *iter_data) 887 { 888 struct ieee80211_local *local = hw_to_local(hw); 889 struct ieee80211_key *key, *tmp; 890 struct ieee80211_sub_if_data *sdata; 891 892 ASSERT_RTNL(); 893 894 mutex_lock(&local->key_mtx); 895 if (vif) { 896 sdata = vif_to_sdata(vif); 897 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) 898 iter(hw, &sdata->vif, 899 key->sta ? &key->sta->sta : NULL, 900 &key->conf, iter_data); 901 } else { 902 list_for_each_entry(sdata, &local->interfaces, list) 903 list_for_each_entry_safe(key, tmp, 904 &sdata->key_list, list) 905 iter(hw, &sdata->vif, 906 key->sta ? &key->sta->sta : NULL, 907 &key->conf, iter_data); 908 } 909 mutex_unlock(&local->key_mtx); 910 } 911 EXPORT_SYMBOL(ieee80211_iter_keys); 912 913 static void 914 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw, 915 struct ieee80211_sub_if_data *sdata, 916 void (*iter)(struct ieee80211_hw *hw, 917 struct ieee80211_vif *vif, 918 struct ieee80211_sta *sta, 919 struct ieee80211_key_conf *key, 920 void *data), 921 void *iter_data) 922 { 923 struct ieee80211_key *key; 924 925 list_for_each_entry_rcu(key, &sdata->key_list, list) { 926 /* skip keys of station in removal process */ 927 if (key->sta && key->sta->removed) 928 continue; 929 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 930 continue; 931 932 iter(hw, &sdata->vif, 933 key->sta ? &key->sta->sta : NULL, 934 &key->conf, iter_data); 935 } 936 } 937 938 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw, 939 struct ieee80211_vif *vif, 940 void (*iter)(struct ieee80211_hw *hw, 941 struct ieee80211_vif *vif, 942 struct ieee80211_sta *sta, 943 struct ieee80211_key_conf *key, 944 void *data), 945 void *iter_data) 946 { 947 struct ieee80211_local *local = hw_to_local(hw); 948 struct ieee80211_sub_if_data *sdata; 949 950 if (vif) { 951 sdata = vif_to_sdata(vif); 952 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data); 953 } else { 954 list_for_each_entry_rcu(sdata, &local->interfaces, list) 955 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data); 956 } 957 } 958 EXPORT_SYMBOL(ieee80211_iter_keys_rcu); 959 960 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata, 961 struct list_head *keys) 962 { 963 struct ieee80211_key *key, *tmp; 964 965 decrease_tailroom_need_count(sdata, 966 sdata->crypto_tx_tailroom_pending_dec); 967 sdata->crypto_tx_tailroom_pending_dec = 0; 968 969 ieee80211_debugfs_key_remove_mgmt_default(sdata); 970 971 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) { 972 ieee80211_key_replace(key->sdata, key->sta, 973 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 974 key, NULL); 975 list_add_tail(&key->list, keys); 976 } 977 978 ieee80211_debugfs_key_update_default(sdata); 979 } 980 981 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata, 982 bool force_synchronize) 983 { 984 struct ieee80211_local *local = sdata->local; 985 struct ieee80211_sub_if_data *vlan; 986 struct ieee80211_sub_if_data *master; 987 struct ieee80211_key *key, *tmp; 988 LIST_HEAD(keys); 989 990 cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk); 991 992 mutex_lock(&local->key_mtx); 993 994 ieee80211_free_keys_iface(sdata, &keys); 995 996 if (sdata->vif.type == NL80211_IFTYPE_AP) { 997 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 998 ieee80211_free_keys_iface(vlan, &keys); 999 } 1000 1001 if (!list_empty(&keys) || force_synchronize) 1002 synchronize_net(); 1003 list_for_each_entry_safe(key, tmp, &keys, list) 1004 __ieee80211_key_destroy(key, false); 1005 1006 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1007 if (sdata->bss) { 1008 master = container_of(sdata->bss, 1009 struct ieee80211_sub_if_data, 1010 u.ap); 1011 1012 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt != 1013 master->crypto_tx_tailroom_needed_cnt); 1014 } 1015 } else { 1016 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || 1017 sdata->crypto_tx_tailroom_pending_dec); 1018 } 1019 1020 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1021 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 1022 WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt || 1023 vlan->crypto_tx_tailroom_pending_dec); 1024 } 1025 1026 mutex_unlock(&local->key_mtx); 1027 } 1028 1029 void ieee80211_free_sta_keys(struct ieee80211_local *local, 1030 struct sta_info *sta) 1031 { 1032 struct ieee80211_key *key; 1033 int i; 1034 1035 mutex_lock(&local->key_mtx); 1036 for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) { 1037 key = key_mtx_dereference(local, sta->gtk[i]); 1038 if (!key) 1039 continue; 1040 ieee80211_key_replace(key->sdata, key->sta, 1041 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 1042 key, NULL); 1043 __ieee80211_key_destroy(key, key->sdata->vif.type == 1044 NL80211_IFTYPE_STATION); 1045 } 1046 1047 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 1048 key = key_mtx_dereference(local, sta->ptk[i]); 1049 if (!key) 1050 continue; 1051 ieee80211_key_replace(key->sdata, key->sta, 1052 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 1053 key, NULL); 1054 __ieee80211_key_destroy(key, key->sdata->vif.type == 1055 NL80211_IFTYPE_STATION); 1056 } 1057 1058 mutex_unlock(&local->key_mtx); 1059 } 1060 1061 void ieee80211_delayed_tailroom_dec(struct work_struct *wk) 1062 { 1063 struct ieee80211_sub_if_data *sdata; 1064 1065 sdata = container_of(wk, struct ieee80211_sub_if_data, 1066 dec_tailroom_needed_wk.work); 1067 1068 /* 1069 * The reason for the delayed tailroom needed decrementing is to 1070 * make roaming faster: during roaming, all keys are first deleted 1071 * and then new keys are installed. The first new key causes the 1072 * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes 1073 * the cost of synchronize_net() (which can be slow). Avoid this 1074 * by deferring the crypto_tx_tailroom_needed_cnt decrementing on 1075 * key removal for a while, so if we roam the value is larger than 1076 * zero and no 0->1 transition happens. 1077 * 1078 * The cost is that if the AP switching was from an AP with keys 1079 * to one without, we still allocate tailroom while it would no 1080 * longer be needed. However, in the typical (fast) roaming case 1081 * within an ESS this usually won't happen. 1082 */ 1083 1084 mutex_lock(&sdata->local->key_mtx); 1085 decrease_tailroom_need_count(sdata, 1086 sdata->crypto_tx_tailroom_pending_dec); 1087 sdata->crypto_tx_tailroom_pending_dec = 0; 1088 mutex_unlock(&sdata->local->key_mtx); 1089 } 1090 1091 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid, 1092 const u8 *replay_ctr, gfp_t gfp) 1093 { 1094 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1095 1096 trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr); 1097 1098 cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp); 1099 } 1100 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify); 1101 1102 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf, 1103 int tid, struct ieee80211_key_seq *seq) 1104 { 1105 struct ieee80211_key *key; 1106 const u8 *pn; 1107 1108 key = container_of(keyconf, struct ieee80211_key, conf); 1109 1110 switch (key->conf.cipher) { 1111 case WLAN_CIPHER_SUITE_TKIP: 1112 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) 1113 return; 1114 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32; 1115 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16; 1116 break; 1117 case WLAN_CIPHER_SUITE_CCMP: 1118 case WLAN_CIPHER_SUITE_CCMP_256: 1119 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1120 return; 1121 if (tid < 0) 1122 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; 1123 else 1124 pn = key->u.ccmp.rx_pn[tid]; 1125 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN); 1126 break; 1127 case WLAN_CIPHER_SUITE_AES_CMAC: 1128 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1129 if (WARN_ON(tid != 0)) 1130 return; 1131 pn = key->u.aes_cmac.rx_pn; 1132 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN); 1133 break; 1134 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1135 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1136 if (WARN_ON(tid != 0)) 1137 return; 1138 pn = key->u.aes_gmac.rx_pn; 1139 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN); 1140 break; 1141 case WLAN_CIPHER_SUITE_GCMP: 1142 case WLAN_CIPHER_SUITE_GCMP_256: 1143 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1144 return; 1145 if (tid < 0) 1146 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; 1147 else 1148 pn = key->u.gcmp.rx_pn[tid]; 1149 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN); 1150 break; 1151 } 1152 } 1153 EXPORT_SYMBOL(ieee80211_get_key_rx_seq); 1154 1155 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf, 1156 int tid, struct ieee80211_key_seq *seq) 1157 { 1158 struct ieee80211_key *key; 1159 u8 *pn; 1160 1161 key = container_of(keyconf, struct ieee80211_key, conf); 1162 1163 switch (key->conf.cipher) { 1164 case WLAN_CIPHER_SUITE_TKIP: 1165 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) 1166 return; 1167 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32; 1168 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16; 1169 break; 1170 case WLAN_CIPHER_SUITE_CCMP: 1171 case WLAN_CIPHER_SUITE_CCMP_256: 1172 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1173 return; 1174 if (tid < 0) 1175 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; 1176 else 1177 pn = key->u.ccmp.rx_pn[tid]; 1178 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN); 1179 break; 1180 case WLAN_CIPHER_SUITE_AES_CMAC: 1181 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1182 if (WARN_ON(tid != 0)) 1183 return; 1184 pn = key->u.aes_cmac.rx_pn; 1185 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN); 1186 break; 1187 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1188 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1189 if (WARN_ON(tid != 0)) 1190 return; 1191 pn = key->u.aes_gmac.rx_pn; 1192 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN); 1193 break; 1194 case WLAN_CIPHER_SUITE_GCMP: 1195 case WLAN_CIPHER_SUITE_GCMP_256: 1196 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1197 return; 1198 if (tid < 0) 1199 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; 1200 else 1201 pn = key->u.gcmp.rx_pn[tid]; 1202 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN); 1203 break; 1204 default: 1205 WARN_ON(1); 1206 break; 1207 } 1208 } 1209 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq); 1210 1211 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf) 1212 { 1213 struct ieee80211_key *key; 1214 1215 key = container_of(keyconf, struct ieee80211_key, conf); 1216 1217 assert_key_lock(key->local); 1218 1219 /* 1220 * if key was uploaded, we assume the driver will/has remove(d) 1221 * it, so adjust bookkeeping accordingly 1222 */ 1223 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { 1224 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; 1225 1226 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | 1227 IEEE80211_KEY_FLAG_PUT_MIC_SPACE | 1228 IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) 1229 increment_tailroom_need_count(key->sdata); 1230 } 1231 1232 ieee80211_key_free(key, false); 1233 } 1234 EXPORT_SYMBOL_GPL(ieee80211_remove_key); 1235 1236 struct ieee80211_key_conf * 1237 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif, 1238 struct ieee80211_key_conf *keyconf) 1239 { 1240 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1241 struct ieee80211_local *local = sdata->local; 1242 struct ieee80211_key *key; 1243 int err; 1244 1245 if (WARN_ON(!local->wowlan)) 1246 return ERR_PTR(-EINVAL); 1247 1248 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 1249 return ERR_PTR(-EINVAL); 1250 1251 key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx, 1252 keyconf->keylen, keyconf->key, 1253 0, NULL, NULL); 1254 if (IS_ERR(key)) 1255 return ERR_CAST(key); 1256 1257 if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED) 1258 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT; 1259 1260 err = ieee80211_key_link(key, sdata, NULL); 1261 if (err) 1262 return ERR_PTR(err); 1263 1264 return &key->conf; 1265 } 1266 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add); 1267