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 */ 10 11 #include <linux/if_ether.h> 12 #include <linux/etherdevice.h> 13 #include <linux/list.h> 14 #include <linux/rcupdate.h> 15 #include <linux/rtnetlink.h> 16 #include <linux/slab.h> 17 #include <linux/export.h> 18 #include <net/mac80211.h> 19 #include <crypto/algapi.h> 20 #include <asm/unaligned.h> 21 #include "ieee80211_i.h" 22 #include "driver-ops.h" 23 #include "debugfs_key.h" 24 #include "aes_ccm.h" 25 #include "aes_cmac.h" 26 #include "aes_gmac.h" 27 #include "aes_gcm.h" 28 29 30 /** 31 * DOC: Key handling basics 32 * 33 * Key handling in mac80211 is done based on per-interface (sub_if_data) 34 * keys and per-station keys. Since each station belongs to an interface, 35 * each station key also belongs to that interface. 36 * 37 * Hardware acceleration is done on a best-effort basis for algorithms 38 * that are implemented in software, for each key the hardware is asked 39 * to enable that key for offloading but if it cannot do that the key is 40 * simply kept for software encryption (unless it is for an algorithm 41 * that isn't implemented in software). 42 * There is currently no way of knowing whether a key is handled in SW 43 * or HW except by looking into debugfs. 44 * 45 * All key management is internally protected by a mutex. Within all 46 * other parts of mac80211, key references are, just as STA structure 47 * references, protected by RCU. Note, however, that some things are 48 * unprotected, namely the key->sta dereferences within the hardware 49 * acceleration functions. This means that sta_info_destroy() must 50 * remove the key which waits for an RCU grace period. 51 */ 52 53 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; 54 55 static void assert_key_lock(struct ieee80211_local *local) 56 { 57 lockdep_assert_held(&local->key_mtx); 58 } 59 60 static void 61 update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta) 62 { 63 struct ieee80211_sub_if_data *vlan; 64 65 if (sdata->vif.type != NL80211_IFTYPE_AP) 66 return; 67 68 /* crypto_tx_tailroom_needed_cnt is protected by this */ 69 assert_key_lock(sdata->local); 70 71 rcu_read_lock(); 72 73 list_for_each_entry_rcu(vlan, &sdata->u.ap.vlans, u.vlan.list) 74 vlan->crypto_tx_tailroom_needed_cnt += delta; 75 76 rcu_read_unlock(); 77 } 78 79 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata) 80 { 81 /* 82 * When this count is zero, SKB resizing for allocating tailroom 83 * for IV or MMIC is skipped. But, this check has created two race 84 * cases in xmit path while transiting from zero count to one: 85 * 86 * 1. SKB resize was skipped because no key was added but just before 87 * the xmit key is added and SW encryption kicks off. 88 * 89 * 2. SKB resize was skipped because all the keys were hw planted but 90 * just before xmit one of the key is deleted and SW encryption kicks 91 * off. 92 * 93 * In both the above case SW encryption will find not enough space for 94 * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c) 95 * 96 * Solution has been explained at 97 * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net 98 */ 99 100 assert_key_lock(sdata->local); 101 102 update_vlan_tailroom_need_count(sdata, 1); 103 104 if (!sdata->crypto_tx_tailroom_needed_cnt++) { 105 /* 106 * Flush all XMIT packets currently using HW encryption or no 107 * encryption at all if the count transition is from 0 -> 1. 108 */ 109 synchronize_net(); 110 } 111 } 112 113 static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata, 114 int delta) 115 { 116 assert_key_lock(sdata->local); 117 118 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta); 119 120 update_vlan_tailroom_need_count(sdata, -delta); 121 sdata->crypto_tx_tailroom_needed_cnt -= delta; 122 } 123 124 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key) 125 { 126 struct ieee80211_sub_if_data *sdata = key->sdata; 127 struct sta_info *sta; 128 int ret = -EOPNOTSUPP; 129 130 might_sleep(); 131 132 if (key->flags & KEY_FLAG_TAINTED) { 133 /* If we get here, it's during resume and the key is 134 * tainted so shouldn't be used/programmed any more. 135 * However, its flags may still indicate that it was 136 * programmed into the device (since we're in resume) 137 * so clear that flag now to avoid trying to remove 138 * it again later. 139 */ 140 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE && 141 !(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | 142 IEEE80211_KEY_FLAG_PUT_MIC_SPACE | 143 IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) 144 increment_tailroom_need_count(sdata); 145 146 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; 147 return -EINVAL; 148 } 149 150 if (!key->local->ops->set_key) 151 goto out_unsupported; 152 153 assert_key_lock(key->local); 154 155 sta = key->sta; 156 157 /* 158 * If this is a per-STA GTK, check if it 159 * is supported; if not, return. 160 */ 161 if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) && 162 !ieee80211_hw_check(&key->local->hw, SUPPORTS_PER_STA_GTK)) 163 goto out_unsupported; 164 165 if (sta && !sta->uploaded) 166 goto out_unsupported; 167 168 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 169 /* 170 * The driver doesn't know anything about VLAN interfaces. 171 * Hence, don't send GTKs for VLAN interfaces to the driver. 172 */ 173 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) { 174 ret = 1; 175 goto out_unsupported; 176 } 177 } 178 179 ret = drv_set_key(key->local, SET_KEY, sdata, 180 sta ? &sta->sta : NULL, &key->conf); 181 182 if (!ret) { 183 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; 184 185 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | 186 IEEE80211_KEY_FLAG_PUT_MIC_SPACE | 187 IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) 188 decrease_tailroom_need_count(sdata, 1); 189 190 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && 191 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)); 192 193 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) && 194 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)); 195 196 return 0; 197 } 198 199 if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1) 200 sdata_err(sdata, 201 "failed to set key (%d, %pM) to hardware (%d)\n", 202 key->conf.keyidx, 203 sta ? sta->sta.addr : bcast_addr, ret); 204 205 out_unsupported: 206 switch (key->conf.cipher) { 207 case WLAN_CIPHER_SUITE_WEP40: 208 case WLAN_CIPHER_SUITE_WEP104: 209 case WLAN_CIPHER_SUITE_TKIP: 210 case WLAN_CIPHER_SUITE_CCMP: 211 case WLAN_CIPHER_SUITE_CCMP_256: 212 case WLAN_CIPHER_SUITE_AES_CMAC: 213 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 214 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 215 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 216 case WLAN_CIPHER_SUITE_GCMP: 217 case WLAN_CIPHER_SUITE_GCMP_256: 218 /* all of these we can do in software - if driver can */ 219 if (ret == 1) 220 return 0; 221 if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL)) 222 return -EINVAL; 223 return 0; 224 default: 225 return -EINVAL; 226 } 227 } 228 229 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key) 230 { 231 struct ieee80211_sub_if_data *sdata; 232 struct sta_info *sta; 233 int ret; 234 235 might_sleep(); 236 237 if (!key || !key->local->ops->set_key) 238 return; 239 240 assert_key_lock(key->local); 241 242 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 243 return; 244 245 sta = key->sta; 246 sdata = key->sdata; 247 248 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | 249 IEEE80211_KEY_FLAG_PUT_MIC_SPACE | 250 IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) 251 increment_tailroom_need_count(sdata); 252 253 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; 254 ret = drv_set_key(key->local, DISABLE_KEY, sdata, 255 sta ? &sta->sta : NULL, &key->conf); 256 257 if (ret) 258 sdata_err(sdata, 259 "failed to remove key (%d, %pM) from hardware (%d)\n", 260 key->conf.keyidx, 261 sta ? sta->sta.addr : bcast_addr, ret); 262 } 263 264 int ieee80211_set_tx_key(struct ieee80211_key *key) 265 { 266 struct sta_info *sta = key->sta; 267 struct ieee80211_local *local = key->local; 268 269 assert_key_lock(local); 270 271 sta->ptk_idx = key->conf.keyidx; 272 ieee80211_check_fast_xmit(sta); 273 274 return 0; 275 } 276 277 static int ieee80211_hw_key_replace(struct ieee80211_key *old_key, 278 struct ieee80211_key *new_key, 279 bool pairwise) 280 { 281 struct ieee80211_sub_if_data *sdata; 282 struct ieee80211_local *local; 283 struct sta_info *sta; 284 int ret; 285 286 /* Aggregation sessions are OK when running on SW crypto. 287 * A broken remote STA may cause issues not observed with HW 288 * crypto, though. 289 */ 290 if (!(old_key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 291 return 0; 292 293 assert_key_lock(old_key->local); 294 sta = old_key->sta; 295 296 /* Unicast rekey without Extended Key ID needs special handling */ 297 if (new_key && sta && pairwise && 298 rcu_access_pointer(sta->ptk[sta->ptk_idx]) == old_key) { 299 local = old_key->local; 300 sdata = old_key->sdata; 301 302 /* Stop TX till we are on the new key */ 303 old_key->flags |= KEY_FLAG_TAINTED; 304 ieee80211_clear_fast_xmit(sta); 305 306 /* Aggregation sessions during rekey are complicated due to the 307 * reorder buffer and retransmits. Side step that by blocking 308 * aggregation during rekey and tear down running sessions. 309 */ 310 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 311 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 312 ieee80211_sta_tear_down_BA_sessions(sta, 313 AGG_STOP_LOCAL_REQUEST); 314 } 315 316 if (!wiphy_ext_feature_isset(local->hw.wiphy, 317 NL80211_EXT_FEATURE_CAN_REPLACE_PTK0)) { 318 pr_warn_ratelimited("Rekeying PTK for STA %pM but driver can't safely do that.", 319 sta->sta.addr); 320 /* Flushing the driver queues *may* help prevent 321 * the clear text leaks and freezes. 322 */ 323 ieee80211_flush_queues(local, sdata, false); 324 } 325 } 326 327 ieee80211_key_disable_hw_accel(old_key); 328 329 if (new_key) 330 ret = ieee80211_key_enable_hw_accel(new_key); 331 else 332 ret = 0; 333 334 return ret; 335 } 336 337 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, 338 int idx, bool uni, bool multi) 339 { 340 struct ieee80211_key *key = NULL; 341 342 assert_key_lock(sdata->local); 343 344 if (idx >= 0 && idx < NUM_DEFAULT_KEYS) 345 key = key_mtx_dereference(sdata->local, sdata->keys[idx]); 346 347 if (uni) { 348 rcu_assign_pointer(sdata->default_unicast_key, key); 349 ieee80211_check_fast_xmit_iface(sdata); 350 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 351 drv_set_default_unicast_key(sdata->local, sdata, idx); 352 } 353 354 if (multi) 355 rcu_assign_pointer(sdata->default_multicast_key, key); 356 357 ieee80211_debugfs_key_update_default(sdata); 358 } 359 360 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx, 361 bool uni, bool multi) 362 { 363 mutex_lock(&sdata->local->key_mtx); 364 __ieee80211_set_default_key(sdata, idx, uni, multi); 365 mutex_unlock(&sdata->local->key_mtx); 366 } 367 368 static void 369 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx) 370 { 371 struct ieee80211_key *key = NULL; 372 373 assert_key_lock(sdata->local); 374 375 if (idx >= NUM_DEFAULT_KEYS && 376 idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 377 key = key_mtx_dereference(sdata->local, sdata->keys[idx]); 378 379 rcu_assign_pointer(sdata->default_mgmt_key, key); 380 381 ieee80211_debugfs_key_update_default(sdata); 382 } 383 384 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, 385 int idx) 386 { 387 mutex_lock(&sdata->local->key_mtx); 388 __ieee80211_set_default_mgmt_key(sdata, idx); 389 mutex_unlock(&sdata->local->key_mtx); 390 } 391 392 393 static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, 394 struct sta_info *sta, 395 bool pairwise, 396 struct ieee80211_key *old, 397 struct ieee80211_key *new) 398 { 399 int idx; 400 int ret; 401 bool defunikey, defmultikey, defmgmtkey; 402 403 /* caller must provide at least one old/new */ 404 if (WARN_ON(!new && !old)) 405 return 0; 406 407 if (new) 408 list_add_tail_rcu(&new->list, &sdata->key_list); 409 410 WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx); 411 412 if (old) { 413 idx = old->conf.keyidx; 414 ret = ieee80211_hw_key_replace(old, new, pairwise); 415 } else { 416 /* new must be provided in case old is not */ 417 idx = new->conf.keyidx; 418 if (!new->local->wowlan) 419 ret = ieee80211_key_enable_hw_accel(new); 420 else 421 ret = 0; 422 } 423 424 if (ret) 425 return ret; 426 427 if (sta) { 428 if (pairwise) { 429 rcu_assign_pointer(sta->ptk[idx], new); 430 if (new && 431 !(new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX)) { 432 sta->ptk_idx = idx; 433 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 434 ieee80211_check_fast_xmit(sta); 435 } 436 } else { 437 rcu_assign_pointer(sta->gtk[idx], new); 438 } 439 /* Only needed for transition from no key -> key. 440 * Still triggers unnecessary when using Extended Key ID 441 * and installing the second key ID the first time. 442 */ 443 if (new && !old) 444 ieee80211_check_fast_rx(sta); 445 } else { 446 defunikey = old && 447 old == key_mtx_dereference(sdata->local, 448 sdata->default_unicast_key); 449 defmultikey = old && 450 old == key_mtx_dereference(sdata->local, 451 sdata->default_multicast_key); 452 defmgmtkey = old && 453 old == key_mtx_dereference(sdata->local, 454 sdata->default_mgmt_key); 455 456 if (defunikey && !new) 457 __ieee80211_set_default_key(sdata, -1, true, false); 458 if (defmultikey && !new) 459 __ieee80211_set_default_key(sdata, -1, false, true); 460 if (defmgmtkey && !new) 461 __ieee80211_set_default_mgmt_key(sdata, -1); 462 463 rcu_assign_pointer(sdata->keys[idx], new); 464 if (defunikey && new) 465 __ieee80211_set_default_key(sdata, new->conf.keyidx, 466 true, false); 467 if (defmultikey && new) 468 __ieee80211_set_default_key(sdata, new->conf.keyidx, 469 false, true); 470 if (defmgmtkey && new) 471 __ieee80211_set_default_mgmt_key(sdata, 472 new->conf.keyidx); 473 } 474 475 if (old) 476 list_del_rcu(&old->list); 477 478 return 0; 479 } 480 481 struct ieee80211_key * 482 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, 483 const u8 *key_data, 484 size_t seq_len, const u8 *seq, 485 const struct ieee80211_cipher_scheme *cs) 486 { 487 struct ieee80211_key *key; 488 int i, j, err; 489 490 if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)) 491 return ERR_PTR(-EINVAL); 492 493 key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); 494 if (!key) 495 return ERR_PTR(-ENOMEM); 496 497 /* 498 * Default to software encryption; we'll later upload the 499 * key to the hardware if possible. 500 */ 501 key->conf.flags = 0; 502 key->flags = 0; 503 504 key->conf.cipher = cipher; 505 key->conf.keyidx = idx; 506 key->conf.keylen = key_len; 507 switch (cipher) { 508 case WLAN_CIPHER_SUITE_WEP40: 509 case WLAN_CIPHER_SUITE_WEP104: 510 key->conf.iv_len = IEEE80211_WEP_IV_LEN; 511 key->conf.icv_len = IEEE80211_WEP_ICV_LEN; 512 break; 513 case WLAN_CIPHER_SUITE_TKIP: 514 key->conf.iv_len = IEEE80211_TKIP_IV_LEN; 515 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN; 516 if (seq) { 517 for (i = 0; i < IEEE80211_NUM_TIDS; i++) { 518 key->u.tkip.rx[i].iv32 = 519 get_unaligned_le32(&seq[2]); 520 key->u.tkip.rx[i].iv16 = 521 get_unaligned_le16(seq); 522 } 523 } 524 spin_lock_init(&key->u.tkip.txlock); 525 break; 526 case WLAN_CIPHER_SUITE_CCMP: 527 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN; 528 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN; 529 if (seq) { 530 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) 531 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++) 532 key->u.ccmp.rx_pn[i][j] = 533 seq[IEEE80211_CCMP_PN_LEN - j - 1]; 534 } 535 /* 536 * Initialize AES key state here as an optimization so that 537 * it does not need to be initialized for every packet. 538 */ 539 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt( 540 key_data, key_len, IEEE80211_CCMP_MIC_LEN); 541 if (IS_ERR(key->u.ccmp.tfm)) { 542 err = PTR_ERR(key->u.ccmp.tfm); 543 kfree(key); 544 return ERR_PTR(err); 545 } 546 break; 547 case WLAN_CIPHER_SUITE_CCMP_256: 548 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN; 549 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN; 550 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++) 551 for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++) 552 key->u.ccmp.rx_pn[i][j] = 553 seq[IEEE80211_CCMP_256_PN_LEN - j - 1]; 554 /* Initialize AES key state here as an optimization so that 555 * it does not need to be initialized for every packet. 556 */ 557 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt( 558 key_data, key_len, IEEE80211_CCMP_256_MIC_LEN); 559 if (IS_ERR(key->u.ccmp.tfm)) { 560 err = PTR_ERR(key->u.ccmp.tfm); 561 kfree(key); 562 return ERR_PTR(err); 563 } 564 break; 565 case WLAN_CIPHER_SUITE_AES_CMAC: 566 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 567 key->conf.iv_len = 0; 568 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC) 569 key->conf.icv_len = sizeof(struct ieee80211_mmie); 570 else 571 key->conf.icv_len = sizeof(struct ieee80211_mmie_16); 572 if (seq) 573 for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++) 574 key->u.aes_cmac.rx_pn[j] = 575 seq[IEEE80211_CMAC_PN_LEN - j - 1]; 576 /* 577 * Initialize AES key state here as an optimization so that 578 * it does not need to be initialized for every packet. 579 */ 580 key->u.aes_cmac.tfm = 581 ieee80211_aes_cmac_key_setup(key_data, key_len); 582 if (IS_ERR(key->u.aes_cmac.tfm)) { 583 err = PTR_ERR(key->u.aes_cmac.tfm); 584 kfree(key); 585 return ERR_PTR(err); 586 } 587 break; 588 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 589 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 590 key->conf.iv_len = 0; 591 key->conf.icv_len = sizeof(struct ieee80211_mmie_16); 592 if (seq) 593 for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++) 594 key->u.aes_gmac.rx_pn[j] = 595 seq[IEEE80211_GMAC_PN_LEN - j - 1]; 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.aes_gmac.tfm = 600 ieee80211_aes_gmac_key_setup(key_data, key_len); 601 if (IS_ERR(key->u.aes_gmac.tfm)) { 602 err = PTR_ERR(key->u.aes_gmac.tfm); 603 kfree(key); 604 return ERR_PTR(err); 605 } 606 break; 607 case WLAN_CIPHER_SUITE_GCMP: 608 case WLAN_CIPHER_SUITE_GCMP_256: 609 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN; 610 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN; 611 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++) 612 for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++) 613 key->u.gcmp.rx_pn[i][j] = 614 seq[IEEE80211_GCMP_PN_LEN - j - 1]; 615 /* Initialize AES key state here as an optimization so that 616 * it does not need to be initialized for every packet. 617 */ 618 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data, 619 key_len); 620 if (IS_ERR(key->u.gcmp.tfm)) { 621 err = PTR_ERR(key->u.gcmp.tfm); 622 kfree(key); 623 return ERR_PTR(err); 624 } 625 break; 626 default: 627 if (cs) { 628 if (seq_len && seq_len != cs->pn_len) { 629 kfree(key); 630 return ERR_PTR(-EINVAL); 631 } 632 633 key->conf.iv_len = cs->hdr_len; 634 key->conf.icv_len = cs->mic_len; 635 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) 636 for (j = 0; j < seq_len; j++) 637 key->u.gen.rx_pn[i][j] = 638 seq[seq_len - j - 1]; 639 key->flags |= KEY_FLAG_CIPHER_SCHEME; 640 } 641 } 642 memcpy(key->conf.key, key_data, key_len); 643 INIT_LIST_HEAD(&key->list); 644 645 return key; 646 } 647 648 static void ieee80211_key_free_common(struct ieee80211_key *key) 649 { 650 switch (key->conf.cipher) { 651 case WLAN_CIPHER_SUITE_CCMP: 652 case WLAN_CIPHER_SUITE_CCMP_256: 653 ieee80211_aes_key_free(key->u.ccmp.tfm); 654 break; 655 case WLAN_CIPHER_SUITE_AES_CMAC: 656 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 657 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); 658 break; 659 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 660 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 661 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm); 662 break; 663 case WLAN_CIPHER_SUITE_GCMP: 664 case WLAN_CIPHER_SUITE_GCMP_256: 665 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm); 666 break; 667 } 668 kzfree(key); 669 } 670 671 static void __ieee80211_key_destroy(struct ieee80211_key *key, 672 bool delay_tailroom) 673 { 674 if (key->local) { 675 struct ieee80211_sub_if_data *sdata = key->sdata; 676 677 ieee80211_debugfs_key_remove(key); 678 679 if (delay_tailroom) { 680 /* see ieee80211_delayed_tailroom_dec */ 681 sdata->crypto_tx_tailroom_pending_dec++; 682 schedule_delayed_work(&sdata->dec_tailroom_needed_wk, 683 HZ/2); 684 } else { 685 decrease_tailroom_need_count(sdata, 1); 686 } 687 } 688 689 ieee80211_key_free_common(key); 690 } 691 692 static void ieee80211_key_destroy(struct ieee80211_key *key, 693 bool delay_tailroom) 694 { 695 if (!key) 696 return; 697 698 /* 699 * Synchronize so the TX path and rcu key iterators 700 * can no longer be using this key before we free/remove it. 701 */ 702 synchronize_net(); 703 704 __ieee80211_key_destroy(key, delay_tailroom); 705 } 706 707 void ieee80211_key_free_unused(struct ieee80211_key *key) 708 { 709 WARN_ON(key->sdata || key->local); 710 ieee80211_key_free_common(key); 711 } 712 713 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata, 714 struct ieee80211_key *old, 715 struct ieee80211_key *new) 716 { 717 u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP]; 718 u8 *tk_old, *tk_new; 719 720 if (!old || new->conf.keylen != old->conf.keylen) 721 return false; 722 723 tk_old = old->conf.key; 724 tk_new = new->conf.key; 725 726 /* 727 * In station mode, don't compare the TX MIC key, as it's never used 728 * and offloaded rekeying may not care to send it to the host. This 729 * is the case in iwlwifi, for example. 730 */ 731 if (sdata->vif.type == NL80211_IFTYPE_STATION && 732 new->conf.cipher == WLAN_CIPHER_SUITE_TKIP && 733 new->conf.keylen == WLAN_KEY_LEN_TKIP && 734 !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) { 735 memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP); 736 memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP); 737 memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8); 738 memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8); 739 tk_old = tkip_old; 740 tk_new = tkip_new; 741 } 742 743 return !crypto_memneq(tk_old, tk_new, new->conf.keylen); 744 } 745 746 int ieee80211_key_link(struct ieee80211_key *key, 747 struct ieee80211_sub_if_data *sdata, 748 struct sta_info *sta) 749 { 750 struct ieee80211_key *old_key; 751 int idx = key->conf.keyidx; 752 bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE; 753 /* 754 * We want to delay tailroom updates only for station - in that 755 * case it helps roaming speed, but in other cases it hurts and 756 * can cause warnings to appear. 757 */ 758 bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION; 759 int ret = -EOPNOTSUPP; 760 761 mutex_lock(&sdata->local->key_mtx); 762 763 if (sta && pairwise) { 764 struct ieee80211_key *alt_key; 765 766 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]); 767 alt_key = key_mtx_dereference(sdata->local, sta->ptk[idx ^ 1]); 768 769 /* The rekey code assumes that the old and new key are using 770 * the same cipher. Enforce the assumption for pairwise keys. 771 */ 772 if (key && 773 ((alt_key && alt_key->conf.cipher != key->conf.cipher) || 774 (old_key && old_key->conf.cipher != key->conf.cipher))) 775 goto out; 776 } else if (sta) { 777 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]); 778 } else { 779 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]); 780 } 781 782 /* Non-pairwise keys must also not switch the cipher on rekey */ 783 if (!pairwise) { 784 if (key && old_key && old_key->conf.cipher != key->conf.cipher) 785 goto out; 786 } 787 788 /* 789 * Silently accept key re-installation without really installing the 790 * new version of the key to avoid nonce reuse or replay issues. 791 */ 792 if (ieee80211_key_identical(sdata, old_key, key)) { 793 ieee80211_key_free_unused(key); 794 ret = 0; 795 goto out; 796 } 797 798 key->local = sdata->local; 799 key->sdata = sdata; 800 key->sta = sta; 801 802 increment_tailroom_need_count(sdata); 803 804 ret = ieee80211_key_replace(sdata, sta, pairwise, old_key, key); 805 806 if (!ret) { 807 ieee80211_debugfs_key_add(key); 808 ieee80211_key_destroy(old_key, delay_tailroom); 809 } else { 810 ieee80211_key_free(key, delay_tailroom); 811 } 812 813 out: 814 mutex_unlock(&sdata->local->key_mtx); 815 816 return ret; 817 } 818 819 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom) 820 { 821 if (!key) 822 return; 823 824 /* 825 * Replace key with nothingness if it was ever used. 826 */ 827 if (key->sdata) 828 ieee80211_key_replace(key->sdata, key->sta, 829 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 830 key, NULL); 831 ieee80211_key_destroy(key, delay_tailroom); 832 } 833 834 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata) 835 { 836 struct ieee80211_key *key; 837 struct ieee80211_sub_if_data *vlan; 838 839 ASSERT_RTNL(); 840 841 if (WARN_ON(!ieee80211_sdata_running(sdata))) 842 return; 843 844 mutex_lock(&sdata->local->key_mtx); 845 846 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || 847 sdata->crypto_tx_tailroom_pending_dec); 848 849 if (sdata->vif.type == NL80211_IFTYPE_AP) { 850 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 851 WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt || 852 vlan->crypto_tx_tailroom_pending_dec); 853 } 854 855 list_for_each_entry(key, &sdata->key_list, list) { 856 increment_tailroom_need_count(sdata); 857 ieee80211_key_enable_hw_accel(key); 858 } 859 860 mutex_unlock(&sdata->local->key_mtx); 861 } 862 863 void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata) 864 { 865 struct ieee80211_sub_if_data *vlan; 866 867 mutex_lock(&sdata->local->key_mtx); 868 869 sdata->crypto_tx_tailroom_needed_cnt = 0; 870 871 if (sdata->vif.type == NL80211_IFTYPE_AP) { 872 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 873 vlan->crypto_tx_tailroom_needed_cnt = 0; 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