1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 5 * Copyright 2007-2008 Johannes Berg <johannes@sipsolutions.net> 6 * Copyright 2013-2014 Intel Mobile Communications GmbH 7 * Copyright 2015-2017 Intel Deutschland GmbH 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 14 #include <linux/if_ether.h> 15 #include <linux/etherdevice.h> 16 #include <linux/list.h> 17 #include <linux/rcupdate.h> 18 #include <linux/rtnetlink.h> 19 #include <linux/slab.h> 20 #include <linux/export.h> 21 #include <net/mac80211.h> 22 #include <crypto/algapi.h> 23 #include <asm/unaligned.h> 24 #include "ieee80211_i.h" 25 #include "driver-ops.h" 26 #include "debugfs_key.h" 27 #include "aes_ccm.h" 28 #include "aes_cmac.h" 29 #include "aes_gmac.h" 30 #include "aes_gcm.h" 31 32 33 /** 34 * DOC: Key handling basics 35 * 36 * Key handling in mac80211 is done based on per-interface (sub_if_data) 37 * keys and per-station keys. Since each station belongs to an interface, 38 * each station key also belongs to that interface. 39 * 40 * Hardware acceleration is done on a best-effort basis for algorithms 41 * that are implemented in software, for each key the hardware is asked 42 * to enable that key for offloading but if it cannot do that the key is 43 * simply kept for software encryption (unless it is for an algorithm 44 * that isn't implemented in software). 45 * There is currently no way of knowing whether a key is handled in SW 46 * or HW except by looking into debugfs. 47 * 48 * All key management is internally protected by a mutex. Within all 49 * other parts of mac80211, key references are, just as STA structure 50 * references, protected by RCU. Note, however, that some things are 51 * unprotected, namely the key->sta dereferences within the hardware 52 * acceleration functions. This means that sta_info_destroy() must 53 * remove the key which waits for an RCU grace period. 54 */ 55 56 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; 57 58 static void assert_key_lock(struct ieee80211_local *local) 59 { 60 lockdep_assert_held(&local->key_mtx); 61 } 62 63 static void 64 update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta) 65 { 66 struct ieee80211_sub_if_data *vlan; 67 68 if (sdata->vif.type != NL80211_IFTYPE_AP) 69 return; 70 71 /* crypto_tx_tailroom_needed_cnt is protected by this */ 72 assert_key_lock(sdata->local); 73 74 rcu_read_lock(); 75 76 list_for_each_entry_rcu(vlan, &sdata->u.ap.vlans, u.vlan.list) 77 vlan->crypto_tx_tailroom_needed_cnt += delta; 78 79 rcu_read_unlock(); 80 } 81 82 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata) 83 { 84 /* 85 * When this count is zero, SKB resizing for allocating tailroom 86 * for IV or MMIC is skipped. But, this check has created two race 87 * cases in xmit path while transiting from zero count to one: 88 * 89 * 1. SKB resize was skipped because no key was added but just before 90 * the xmit key is added and SW encryption kicks off. 91 * 92 * 2. SKB resize was skipped because all the keys were hw planted but 93 * just before xmit one of the key is deleted and SW encryption kicks 94 * off. 95 * 96 * In both the above case SW encryption will find not enough space for 97 * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c) 98 * 99 * Solution has been explained at 100 * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net 101 */ 102 103 assert_key_lock(sdata->local); 104 105 update_vlan_tailroom_need_count(sdata, 1); 106 107 if (!sdata->crypto_tx_tailroom_needed_cnt++) { 108 /* 109 * Flush all XMIT packets currently using HW encryption or no 110 * encryption at all if the count transition is from 0 -> 1. 111 */ 112 synchronize_net(); 113 } 114 } 115 116 static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata, 117 int delta) 118 { 119 assert_key_lock(sdata->local); 120 121 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta); 122 123 update_vlan_tailroom_need_count(sdata, -delta); 124 sdata->crypto_tx_tailroom_needed_cnt -= delta; 125 } 126 127 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key) 128 { 129 struct ieee80211_sub_if_data *sdata = key->sdata; 130 struct sta_info *sta; 131 int ret = -EOPNOTSUPP; 132 133 might_sleep(); 134 135 if (key->flags & KEY_FLAG_TAINTED) { 136 /* If we get here, it's during resume and the key is 137 * tainted so shouldn't be used/programmed any more. 138 * However, its flags may still indicate that it was 139 * programmed into the device (since we're in resume) 140 * so clear that flag now to avoid trying to remove 141 * it again later. 142 */ 143 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; 144 return -EINVAL; 145 } 146 147 if (!key->local->ops->set_key) 148 goto out_unsupported; 149 150 assert_key_lock(key->local); 151 152 sta = key->sta; 153 154 /* 155 * If this is a per-STA GTK, check if it 156 * is supported; if not, return. 157 */ 158 if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) && 159 !ieee80211_hw_check(&key->local->hw, SUPPORTS_PER_STA_GTK)) 160 goto out_unsupported; 161 162 if (sta && !sta->uploaded) 163 goto out_unsupported; 164 165 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 166 /* 167 * The driver doesn't know anything about VLAN interfaces. 168 * Hence, don't send GTKs for VLAN interfaces to the driver. 169 */ 170 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) { 171 ret = 1; 172 goto out_unsupported; 173 } 174 } 175 176 ret = drv_set_key(key->local, SET_KEY, sdata, 177 sta ? &sta->sta : NULL, &key->conf); 178 179 if (!ret) { 180 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; 181 182 if (!((key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | 183 IEEE80211_KEY_FLAG_PUT_MIC_SPACE)) || 184 (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) 185 decrease_tailroom_need_count(sdata, 1); 186 187 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && 188 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)); 189 190 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) && 191 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)); 192 193 return 0; 194 } 195 196 if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1) 197 sdata_err(sdata, 198 "failed to set key (%d, %pM) to hardware (%d)\n", 199 key->conf.keyidx, 200 sta ? sta->sta.addr : bcast_addr, ret); 201 202 out_unsupported: 203 switch (key->conf.cipher) { 204 case WLAN_CIPHER_SUITE_WEP40: 205 case WLAN_CIPHER_SUITE_WEP104: 206 case WLAN_CIPHER_SUITE_TKIP: 207 case WLAN_CIPHER_SUITE_CCMP: 208 case WLAN_CIPHER_SUITE_CCMP_256: 209 case WLAN_CIPHER_SUITE_AES_CMAC: 210 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 211 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 212 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 213 case WLAN_CIPHER_SUITE_GCMP: 214 case WLAN_CIPHER_SUITE_GCMP_256: 215 /* all of these we can do in software - if driver can */ 216 if (ret == 1) 217 return 0; 218 if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL)) 219 return -EINVAL; 220 return 0; 221 default: 222 return -EINVAL; 223 } 224 } 225 226 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key) 227 { 228 struct ieee80211_sub_if_data *sdata; 229 struct sta_info *sta; 230 int ret; 231 232 might_sleep(); 233 234 if (!key || !key->local->ops->set_key) 235 return; 236 237 assert_key_lock(key->local); 238 239 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 240 return; 241 242 sta = key->sta; 243 sdata = key->sdata; 244 245 if (!((key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | 246 IEEE80211_KEY_FLAG_PUT_MIC_SPACE)) || 247 (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) 248 increment_tailroom_need_count(sdata); 249 250 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; 251 ret = drv_set_key(key->local, DISABLE_KEY, sdata, 252 sta ? &sta->sta : NULL, &key->conf); 253 254 if (ret) 255 sdata_err(sdata, 256 "failed to remove key (%d, %pM) from hardware (%d)\n", 257 key->conf.keyidx, 258 sta ? sta->sta.addr : bcast_addr, ret); 259 } 260 261 static int ieee80211_hw_key_replace(struct ieee80211_key *old_key, 262 struct ieee80211_key *new_key, 263 bool ptk0rekey) 264 { 265 struct ieee80211_sub_if_data *sdata; 266 struct ieee80211_local *local; 267 struct sta_info *sta; 268 int ret; 269 270 /* Aggregation sessions are OK when running on SW crypto. 271 * A broken remote STA may cause issues not observed with HW 272 * crypto, though. 273 */ 274 if (!(old_key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 275 return 0; 276 277 assert_key_lock(old_key->local); 278 sta = old_key->sta; 279 280 /* PTK only using key ID 0 needs special handling on rekey */ 281 if (new_key && sta && ptk0rekey) { 282 local = old_key->local; 283 sdata = old_key->sdata; 284 285 /* Stop TX till we are on the new key */ 286 old_key->flags |= KEY_FLAG_TAINTED; 287 ieee80211_clear_fast_xmit(sta); 288 289 /* Aggregation sessions during rekey are complicated due to the 290 * reorder buffer and retransmits. Side step that by blocking 291 * aggregation during rekey and tear down running sessions. 292 */ 293 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 294 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 295 ieee80211_sta_tear_down_BA_sessions(sta, 296 AGG_STOP_LOCAL_REQUEST); 297 } 298 299 if (!wiphy_ext_feature_isset(local->hw.wiphy, 300 NL80211_EXT_FEATURE_CAN_REPLACE_PTK0)) { 301 pr_warn_ratelimited("Rekeying PTK for STA %pM but driver can't safely do that.", 302 sta->sta.addr); 303 /* Flushing the driver queues *may* help prevent 304 * the clear text leaks and freezes. 305 */ 306 ieee80211_flush_queues(local, sdata, false); 307 } 308 } 309 310 ieee80211_key_disable_hw_accel(old_key); 311 312 if (new_key) 313 ret = ieee80211_key_enable_hw_accel(new_key); 314 else 315 ret = 0; 316 317 return ret; 318 } 319 320 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, 321 int idx, bool uni, bool multi) 322 { 323 struct ieee80211_key *key = NULL; 324 325 assert_key_lock(sdata->local); 326 327 if (idx >= 0 && idx < NUM_DEFAULT_KEYS) 328 key = key_mtx_dereference(sdata->local, sdata->keys[idx]); 329 330 if (uni) { 331 rcu_assign_pointer(sdata->default_unicast_key, key); 332 ieee80211_check_fast_xmit_iface(sdata); 333 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 334 drv_set_default_unicast_key(sdata->local, sdata, idx); 335 } 336 337 if (multi) 338 rcu_assign_pointer(sdata->default_multicast_key, key); 339 340 ieee80211_debugfs_key_update_default(sdata); 341 } 342 343 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx, 344 bool uni, bool multi) 345 { 346 mutex_lock(&sdata->local->key_mtx); 347 __ieee80211_set_default_key(sdata, idx, uni, multi); 348 mutex_unlock(&sdata->local->key_mtx); 349 } 350 351 static void 352 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx) 353 { 354 struct ieee80211_key *key = NULL; 355 356 assert_key_lock(sdata->local); 357 358 if (idx >= NUM_DEFAULT_KEYS && 359 idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 360 key = key_mtx_dereference(sdata->local, sdata->keys[idx]); 361 362 rcu_assign_pointer(sdata->default_mgmt_key, key); 363 364 ieee80211_debugfs_key_update_default(sdata); 365 } 366 367 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, 368 int idx) 369 { 370 mutex_lock(&sdata->local->key_mtx); 371 __ieee80211_set_default_mgmt_key(sdata, idx); 372 mutex_unlock(&sdata->local->key_mtx); 373 } 374 375 376 static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, 377 struct sta_info *sta, 378 bool pairwise, 379 struct ieee80211_key *old, 380 struct ieee80211_key *new) 381 { 382 int idx; 383 int ret; 384 bool defunikey, defmultikey, defmgmtkey; 385 386 /* caller must provide at least one old/new */ 387 if (WARN_ON(!new && !old)) 388 return 0; 389 390 if (new) 391 list_add_tail_rcu(&new->list, &sdata->key_list); 392 393 WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx); 394 395 if (old) { 396 idx = old->conf.keyidx; 397 /* TODO: proper implement and test "Extended Key ID for 398 * Individually Addressed Frames" from IEEE 802.11-2016. 399 * Till then always assume only key ID 0 is used for 400 * pairwise keys.*/ 401 ret = ieee80211_hw_key_replace(old, new, pairwise); 402 } else { 403 /* new must be provided in case old is not */ 404 idx = new->conf.keyidx; 405 if (!new->local->wowlan) 406 ret = ieee80211_key_enable_hw_accel(new); 407 else 408 ret = 0; 409 } 410 411 if (ret) 412 return ret; 413 414 if (sta) { 415 if (pairwise) { 416 rcu_assign_pointer(sta->ptk[idx], new); 417 sta->ptk_idx = idx; 418 if (new) { 419 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 420 ieee80211_check_fast_xmit(sta); 421 } 422 } else { 423 rcu_assign_pointer(sta->gtk[idx], new); 424 } 425 if (new) 426 ieee80211_check_fast_rx(sta); 427 } else { 428 defunikey = old && 429 old == key_mtx_dereference(sdata->local, 430 sdata->default_unicast_key); 431 defmultikey = old && 432 old == key_mtx_dereference(sdata->local, 433 sdata->default_multicast_key); 434 defmgmtkey = old && 435 old == key_mtx_dereference(sdata->local, 436 sdata->default_mgmt_key); 437 438 if (defunikey && !new) 439 __ieee80211_set_default_key(sdata, -1, true, false); 440 if (defmultikey && !new) 441 __ieee80211_set_default_key(sdata, -1, false, true); 442 if (defmgmtkey && !new) 443 __ieee80211_set_default_mgmt_key(sdata, -1); 444 445 rcu_assign_pointer(sdata->keys[idx], new); 446 if (defunikey && new) 447 __ieee80211_set_default_key(sdata, new->conf.keyidx, 448 true, false); 449 if (defmultikey && new) 450 __ieee80211_set_default_key(sdata, new->conf.keyidx, 451 false, true); 452 if (defmgmtkey && new) 453 __ieee80211_set_default_mgmt_key(sdata, 454 new->conf.keyidx); 455 } 456 457 if (old) 458 list_del_rcu(&old->list); 459 460 return 0; 461 } 462 463 struct ieee80211_key * 464 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, 465 const u8 *key_data, 466 size_t seq_len, const u8 *seq, 467 const struct ieee80211_cipher_scheme *cs) 468 { 469 struct ieee80211_key *key; 470 int i, j, err; 471 472 if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)) 473 return ERR_PTR(-EINVAL); 474 475 key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); 476 if (!key) 477 return ERR_PTR(-ENOMEM); 478 479 /* 480 * Default to software encryption; we'll later upload the 481 * key to the hardware if possible. 482 */ 483 key->conf.flags = 0; 484 key->flags = 0; 485 486 key->conf.cipher = cipher; 487 key->conf.keyidx = idx; 488 key->conf.keylen = key_len; 489 switch (cipher) { 490 case WLAN_CIPHER_SUITE_WEP40: 491 case WLAN_CIPHER_SUITE_WEP104: 492 key->conf.iv_len = IEEE80211_WEP_IV_LEN; 493 key->conf.icv_len = IEEE80211_WEP_ICV_LEN; 494 break; 495 case WLAN_CIPHER_SUITE_TKIP: 496 key->conf.iv_len = IEEE80211_TKIP_IV_LEN; 497 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN; 498 if (seq) { 499 for (i = 0; i < IEEE80211_NUM_TIDS; i++) { 500 key->u.tkip.rx[i].iv32 = 501 get_unaligned_le32(&seq[2]); 502 key->u.tkip.rx[i].iv16 = 503 get_unaligned_le16(seq); 504 } 505 } 506 spin_lock_init(&key->u.tkip.txlock); 507 break; 508 case WLAN_CIPHER_SUITE_CCMP: 509 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN; 510 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN; 511 if (seq) { 512 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) 513 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++) 514 key->u.ccmp.rx_pn[i][j] = 515 seq[IEEE80211_CCMP_PN_LEN - j - 1]; 516 } 517 /* 518 * Initialize AES key state here as an optimization so that 519 * it does not need to be initialized for every packet. 520 */ 521 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt( 522 key_data, key_len, IEEE80211_CCMP_MIC_LEN); 523 if (IS_ERR(key->u.ccmp.tfm)) { 524 err = PTR_ERR(key->u.ccmp.tfm); 525 kfree(key); 526 return ERR_PTR(err); 527 } 528 break; 529 case WLAN_CIPHER_SUITE_CCMP_256: 530 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN; 531 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN; 532 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++) 533 for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++) 534 key->u.ccmp.rx_pn[i][j] = 535 seq[IEEE80211_CCMP_256_PN_LEN - j - 1]; 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_256_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_AES_CMAC: 548 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 549 key->conf.iv_len = 0; 550 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC) 551 key->conf.icv_len = sizeof(struct ieee80211_mmie); 552 else 553 key->conf.icv_len = sizeof(struct ieee80211_mmie_16); 554 if (seq) 555 for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++) 556 key->u.aes_cmac.rx_pn[j] = 557 seq[IEEE80211_CMAC_PN_LEN - j - 1]; 558 /* 559 * Initialize AES key state here as an optimization so that 560 * it does not need to be initialized for every packet. 561 */ 562 key->u.aes_cmac.tfm = 563 ieee80211_aes_cmac_key_setup(key_data, key_len); 564 if (IS_ERR(key->u.aes_cmac.tfm)) { 565 err = PTR_ERR(key->u.aes_cmac.tfm); 566 kfree(key); 567 return ERR_PTR(err); 568 } 569 break; 570 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 571 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 572 key->conf.iv_len = 0; 573 key->conf.icv_len = sizeof(struct ieee80211_mmie_16); 574 if (seq) 575 for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++) 576 key->u.aes_gmac.rx_pn[j] = 577 seq[IEEE80211_GMAC_PN_LEN - j - 1]; 578 /* Initialize AES key state here as an optimization so that 579 * it does not need to be initialized for every packet. 580 */ 581 key->u.aes_gmac.tfm = 582 ieee80211_aes_gmac_key_setup(key_data, key_len); 583 if (IS_ERR(key->u.aes_gmac.tfm)) { 584 err = PTR_ERR(key->u.aes_gmac.tfm); 585 kfree(key); 586 return ERR_PTR(err); 587 } 588 break; 589 case WLAN_CIPHER_SUITE_GCMP: 590 case WLAN_CIPHER_SUITE_GCMP_256: 591 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN; 592 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN; 593 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++) 594 for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++) 595 key->u.gcmp.rx_pn[i][j] = 596 seq[IEEE80211_GCMP_PN_LEN - j - 1]; 597 /* Initialize AES key state here as an optimization so that 598 * it does not need to be initialized for every packet. 599 */ 600 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data, 601 key_len); 602 if (IS_ERR(key->u.gcmp.tfm)) { 603 err = PTR_ERR(key->u.gcmp.tfm); 604 kfree(key); 605 return ERR_PTR(err); 606 } 607 break; 608 default: 609 if (cs) { 610 if (seq_len && seq_len != cs->pn_len) { 611 kfree(key); 612 return ERR_PTR(-EINVAL); 613 } 614 615 key->conf.iv_len = cs->hdr_len; 616 key->conf.icv_len = cs->mic_len; 617 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) 618 for (j = 0; j < seq_len; j++) 619 key->u.gen.rx_pn[i][j] = 620 seq[seq_len - j - 1]; 621 key->flags |= KEY_FLAG_CIPHER_SCHEME; 622 } 623 } 624 memcpy(key->conf.key, key_data, key_len); 625 INIT_LIST_HEAD(&key->list); 626 627 return key; 628 } 629 630 static void ieee80211_key_free_common(struct ieee80211_key *key) 631 { 632 switch (key->conf.cipher) { 633 case WLAN_CIPHER_SUITE_CCMP: 634 case WLAN_CIPHER_SUITE_CCMP_256: 635 ieee80211_aes_key_free(key->u.ccmp.tfm); 636 break; 637 case WLAN_CIPHER_SUITE_AES_CMAC: 638 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 639 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); 640 break; 641 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 642 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 643 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm); 644 break; 645 case WLAN_CIPHER_SUITE_GCMP: 646 case WLAN_CIPHER_SUITE_GCMP_256: 647 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm); 648 break; 649 } 650 kzfree(key); 651 } 652 653 static void __ieee80211_key_destroy(struct ieee80211_key *key, 654 bool delay_tailroom) 655 { 656 if (key->local) { 657 struct ieee80211_sub_if_data *sdata = key->sdata; 658 659 ieee80211_debugfs_key_remove(key); 660 661 if (delay_tailroom) { 662 /* see ieee80211_delayed_tailroom_dec */ 663 sdata->crypto_tx_tailroom_pending_dec++; 664 schedule_delayed_work(&sdata->dec_tailroom_needed_wk, 665 HZ/2); 666 } else { 667 decrease_tailroom_need_count(sdata, 1); 668 } 669 } 670 671 ieee80211_key_free_common(key); 672 } 673 674 static void ieee80211_key_destroy(struct ieee80211_key *key, 675 bool delay_tailroom) 676 { 677 if (!key) 678 return; 679 680 /* 681 * Synchronize so the TX path and rcu key iterators 682 * can no longer be using this key before we free/remove it. 683 */ 684 synchronize_net(); 685 686 __ieee80211_key_destroy(key, delay_tailroom); 687 } 688 689 void ieee80211_key_free_unused(struct ieee80211_key *key) 690 { 691 WARN_ON(key->sdata || key->local); 692 ieee80211_key_free_common(key); 693 } 694 695 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata, 696 struct ieee80211_key *old, 697 struct ieee80211_key *new) 698 { 699 u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP]; 700 u8 *tk_old, *tk_new; 701 702 if (!old || new->conf.keylen != old->conf.keylen) 703 return false; 704 705 tk_old = old->conf.key; 706 tk_new = new->conf.key; 707 708 /* 709 * In station mode, don't compare the TX MIC key, as it's never used 710 * and offloaded rekeying may not care to send it to the host. This 711 * is the case in iwlwifi, for example. 712 */ 713 if (sdata->vif.type == NL80211_IFTYPE_STATION && 714 new->conf.cipher == WLAN_CIPHER_SUITE_TKIP && 715 new->conf.keylen == WLAN_KEY_LEN_TKIP && 716 !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) { 717 memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP); 718 memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP); 719 memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8); 720 memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8); 721 tk_old = tkip_old; 722 tk_new = tkip_new; 723 } 724 725 return !crypto_memneq(tk_old, tk_new, new->conf.keylen); 726 } 727 728 int ieee80211_key_link(struct ieee80211_key *key, 729 struct ieee80211_sub_if_data *sdata, 730 struct sta_info *sta) 731 { 732 struct ieee80211_key *old_key; 733 int idx = key->conf.keyidx; 734 bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE; 735 /* 736 * We want to delay tailroom updates only for station - in that 737 * case it helps roaming speed, but in other cases it hurts and 738 * can cause warnings to appear. 739 */ 740 bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION; 741 int ret; 742 743 mutex_lock(&sdata->local->key_mtx); 744 745 if (sta && pairwise) 746 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]); 747 else if (sta) 748 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]); 749 else 750 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]); 751 752 /* 753 * Silently accept key re-installation without really installing the 754 * new version of the key to avoid nonce reuse or replay issues. 755 */ 756 if (ieee80211_key_identical(sdata, old_key, key)) { 757 ieee80211_key_free_unused(key); 758 ret = 0; 759 goto out; 760 } 761 762 key->local = sdata->local; 763 key->sdata = sdata; 764 key->sta = sta; 765 766 increment_tailroom_need_count(sdata); 767 768 ret = ieee80211_key_replace(sdata, sta, pairwise, old_key, key); 769 770 if (!ret) { 771 ieee80211_debugfs_key_add(key); 772 ieee80211_key_destroy(old_key, delay_tailroom); 773 } else { 774 ieee80211_key_free(key, delay_tailroom); 775 } 776 777 out: 778 mutex_unlock(&sdata->local->key_mtx); 779 780 return ret; 781 } 782 783 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom) 784 { 785 if (!key) 786 return; 787 788 /* 789 * Replace key with nothingness if it was ever used. 790 */ 791 if (key->sdata) 792 ieee80211_key_replace(key->sdata, key->sta, 793 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 794 key, NULL); 795 ieee80211_key_destroy(key, delay_tailroom); 796 } 797 798 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata) 799 { 800 struct ieee80211_key *key; 801 struct ieee80211_sub_if_data *vlan; 802 803 ASSERT_RTNL(); 804 805 if (WARN_ON(!ieee80211_sdata_running(sdata))) 806 return; 807 808 mutex_lock(&sdata->local->key_mtx); 809 810 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || 811 sdata->crypto_tx_tailroom_pending_dec); 812 813 if (sdata->vif.type == NL80211_IFTYPE_AP) { 814 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 815 WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt || 816 vlan->crypto_tx_tailroom_pending_dec); 817 } 818 819 list_for_each_entry(key, &sdata->key_list, list) { 820 increment_tailroom_need_count(sdata); 821 ieee80211_key_enable_hw_accel(key); 822 } 823 824 mutex_unlock(&sdata->local->key_mtx); 825 } 826 827 void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata) 828 { 829 struct ieee80211_sub_if_data *vlan; 830 831 mutex_lock(&sdata->local->key_mtx); 832 833 sdata->crypto_tx_tailroom_needed_cnt = 0; 834 835 if (sdata->vif.type == NL80211_IFTYPE_AP) { 836 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 837 vlan->crypto_tx_tailroom_needed_cnt = 0; 838 } 839 840 mutex_unlock(&sdata->local->key_mtx); 841 } 842 843 void ieee80211_iter_keys(struct ieee80211_hw *hw, 844 struct ieee80211_vif *vif, 845 void (*iter)(struct ieee80211_hw *hw, 846 struct ieee80211_vif *vif, 847 struct ieee80211_sta *sta, 848 struct ieee80211_key_conf *key, 849 void *data), 850 void *iter_data) 851 { 852 struct ieee80211_local *local = hw_to_local(hw); 853 struct ieee80211_key *key, *tmp; 854 struct ieee80211_sub_if_data *sdata; 855 856 ASSERT_RTNL(); 857 858 mutex_lock(&local->key_mtx); 859 if (vif) { 860 sdata = vif_to_sdata(vif); 861 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) 862 iter(hw, &sdata->vif, 863 key->sta ? &key->sta->sta : NULL, 864 &key->conf, iter_data); 865 } else { 866 list_for_each_entry(sdata, &local->interfaces, list) 867 list_for_each_entry_safe(key, tmp, 868 &sdata->key_list, list) 869 iter(hw, &sdata->vif, 870 key->sta ? &key->sta->sta : NULL, 871 &key->conf, iter_data); 872 } 873 mutex_unlock(&local->key_mtx); 874 } 875 EXPORT_SYMBOL(ieee80211_iter_keys); 876 877 static void 878 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw, 879 struct ieee80211_sub_if_data *sdata, 880 void (*iter)(struct ieee80211_hw *hw, 881 struct ieee80211_vif *vif, 882 struct ieee80211_sta *sta, 883 struct ieee80211_key_conf *key, 884 void *data), 885 void *iter_data) 886 { 887 struct ieee80211_key *key; 888 889 list_for_each_entry_rcu(key, &sdata->key_list, list) { 890 /* skip keys of station in removal process */ 891 if (key->sta && key->sta->removed) 892 continue; 893 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 894 continue; 895 896 iter(hw, &sdata->vif, 897 key->sta ? &key->sta->sta : NULL, 898 &key->conf, iter_data); 899 } 900 } 901 902 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw, 903 struct ieee80211_vif *vif, 904 void (*iter)(struct ieee80211_hw *hw, 905 struct ieee80211_vif *vif, 906 struct ieee80211_sta *sta, 907 struct ieee80211_key_conf *key, 908 void *data), 909 void *iter_data) 910 { 911 struct ieee80211_local *local = hw_to_local(hw); 912 struct ieee80211_sub_if_data *sdata; 913 914 if (vif) { 915 sdata = vif_to_sdata(vif); 916 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data); 917 } else { 918 list_for_each_entry_rcu(sdata, &local->interfaces, list) 919 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data); 920 } 921 } 922 EXPORT_SYMBOL(ieee80211_iter_keys_rcu); 923 924 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata, 925 struct list_head *keys) 926 { 927 struct ieee80211_key *key, *tmp; 928 929 decrease_tailroom_need_count(sdata, 930 sdata->crypto_tx_tailroom_pending_dec); 931 sdata->crypto_tx_tailroom_pending_dec = 0; 932 933 ieee80211_debugfs_key_remove_mgmt_default(sdata); 934 935 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) { 936 ieee80211_key_replace(key->sdata, key->sta, 937 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 938 key, NULL); 939 list_add_tail(&key->list, keys); 940 } 941 942 ieee80211_debugfs_key_update_default(sdata); 943 } 944 945 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata, 946 bool force_synchronize) 947 { 948 struct ieee80211_local *local = sdata->local; 949 struct ieee80211_sub_if_data *vlan; 950 struct ieee80211_sub_if_data *master; 951 struct ieee80211_key *key, *tmp; 952 LIST_HEAD(keys); 953 954 cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk); 955 956 mutex_lock(&local->key_mtx); 957 958 ieee80211_free_keys_iface(sdata, &keys); 959 960 if (sdata->vif.type == NL80211_IFTYPE_AP) { 961 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 962 ieee80211_free_keys_iface(vlan, &keys); 963 } 964 965 if (!list_empty(&keys) || force_synchronize) 966 synchronize_net(); 967 list_for_each_entry_safe(key, tmp, &keys, list) 968 __ieee80211_key_destroy(key, false); 969 970 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 971 if (sdata->bss) { 972 master = container_of(sdata->bss, 973 struct ieee80211_sub_if_data, 974 u.ap); 975 976 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt != 977 master->crypto_tx_tailroom_needed_cnt); 978 } 979 } else { 980 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || 981 sdata->crypto_tx_tailroom_pending_dec); 982 } 983 984 if (sdata->vif.type == NL80211_IFTYPE_AP) { 985 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 986 WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt || 987 vlan->crypto_tx_tailroom_pending_dec); 988 } 989 990 mutex_unlock(&local->key_mtx); 991 } 992 993 void ieee80211_free_sta_keys(struct ieee80211_local *local, 994 struct sta_info *sta) 995 { 996 struct ieee80211_key *key; 997 int i; 998 999 mutex_lock(&local->key_mtx); 1000 for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) { 1001 key = key_mtx_dereference(local, sta->gtk[i]); 1002 if (!key) 1003 continue; 1004 ieee80211_key_replace(key->sdata, key->sta, 1005 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 1006 key, NULL); 1007 __ieee80211_key_destroy(key, key->sdata->vif.type == 1008 NL80211_IFTYPE_STATION); 1009 } 1010 1011 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 1012 key = key_mtx_dereference(local, sta->ptk[i]); 1013 if (!key) 1014 continue; 1015 ieee80211_key_replace(key->sdata, key->sta, 1016 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 1017 key, NULL); 1018 __ieee80211_key_destroy(key, key->sdata->vif.type == 1019 NL80211_IFTYPE_STATION); 1020 } 1021 1022 mutex_unlock(&local->key_mtx); 1023 } 1024 1025 void ieee80211_delayed_tailroom_dec(struct work_struct *wk) 1026 { 1027 struct ieee80211_sub_if_data *sdata; 1028 1029 sdata = container_of(wk, struct ieee80211_sub_if_data, 1030 dec_tailroom_needed_wk.work); 1031 1032 /* 1033 * The reason for the delayed tailroom needed decrementing is to 1034 * make roaming faster: during roaming, all keys are first deleted 1035 * and then new keys are installed. The first new key causes the 1036 * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes 1037 * the cost of synchronize_net() (which can be slow). Avoid this 1038 * by deferring the crypto_tx_tailroom_needed_cnt decrementing on 1039 * key removal for a while, so if we roam the value is larger than 1040 * zero and no 0->1 transition happens. 1041 * 1042 * The cost is that if the AP switching was from an AP with keys 1043 * to one without, we still allocate tailroom while it would no 1044 * longer be needed. However, in the typical (fast) roaming case 1045 * within an ESS this usually won't happen. 1046 */ 1047 1048 mutex_lock(&sdata->local->key_mtx); 1049 decrease_tailroom_need_count(sdata, 1050 sdata->crypto_tx_tailroom_pending_dec); 1051 sdata->crypto_tx_tailroom_pending_dec = 0; 1052 mutex_unlock(&sdata->local->key_mtx); 1053 } 1054 1055 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid, 1056 const u8 *replay_ctr, gfp_t gfp) 1057 { 1058 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1059 1060 trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr); 1061 1062 cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp); 1063 } 1064 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify); 1065 1066 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf, 1067 int tid, struct ieee80211_key_seq *seq) 1068 { 1069 struct ieee80211_key *key; 1070 const u8 *pn; 1071 1072 key = container_of(keyconf, struct ieee80211_key, conf); 1073 1074 switch (key->conf.cipher) { 1075 case WLAN_CIPHER_SUITE_TKIP: 1076 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) 1077 return; 1078 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32; 1079 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16; 1080 break; 1081 case WLAN_CIPHER_SUITE_CCMP: 1082 case WLAN_CIPHER_SUITE_CCMP_256: 1083 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1084 return; 1085 if (tid < 0) 1086 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; 1087 else 1088 pn = key->u.ccmp.rx_pn[tid]; 1089 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN); 1090 break; 1091 case WLAN_CIPHER_SUITE_AES_CMAC: 1092 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1093 if (WARN_ON(tid != 0)) 1094 return; 1095 pn = key->u.aes_cmac.rx_pn; 1096 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN); 1097 break; 1098 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1099 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1100 if (WARN_ON(tid != 0)) 1101 return; 1102 pn = key->u.aes_gmac.rx_pn; 1103 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN); 1104 break; 1105 case WLAN_CIPHER_SUITE_GCMP: 1106 case WLAN_CIPHER_SUITE_GCMP_256: 1107 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1108 return; 1109 if (tid < 0) 1110 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; 1111 else 1112 pn = key->u.gcmp.rx_pn[tid]; 1113 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN); 1114 break; 1115 } 1116 } 1117 EXPORT_SYMBOL(ieee80211_get_key_rx_seq); 1118 1119 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf, 1120 int tid, struct ieee80211_key_seq *seq) 1121 { 1122 struct ieee80211_key *key; 1123 u8 *pn; 1124 1125 key = container_of(keyconf, struct ieee80211_key, conf); 1126 1127 switch (key->conf.cipher) { 1128 case WLAN_CIPHER_SUITE_TKIP: 1129 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) 1130 return; 1131 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32; 1132 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16; 1133 break; 1134 case WLAN_CIPHER_SUITE_CCMP: 1135 case WLAN_CIPHER_SUITE_CCMP_256: 1136 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1137 return; 1138 if (tid < 0) 1139 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; 1140 else 1141 pn = key->u.ccmp.rx_pn[tid]; 1142 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN); 1143 break; 1144 case WLAN_CIPHER_SUITE_AES_CMAC: 1145 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1146 if (WARN_ON(tid != 0)) 1147 return; 1148 pn = key->u.aes_cmac.rx_pn; 1149 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN); 1150 break; 1151 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1152 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1153 if (WARN_ON(tid != 0)) 1154 return; 1155 pn = key->u.aes_gmac.rx_pn; 1156 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN); 1157 break; 1158 case WLAN_CIPHER_SUITE_GCMP: 1159 case WLAN_CIPHER_SUITE_GCMP_256: 1160 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1161 return; 1162 if (tid < 0) 1163 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; 1164 else 1165 pn = key->u.gcmp.rx_pn[tid]; 1166 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN); 1167 break; 1168 default: 1169 WARN_ON(1); 1170 break; 1171 } 1172 } 1173 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq); 1174 1175 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf) 1176 { 1177 struct ieee80211_key *key; 1178 1179 key = container_of(keyconf, struct ieee80211_key, conf); 1180 1181 assert_key_lock(key->local); 1182 1183 /* 1184 * if key was uploaded, we assume the driver will/has remove(d) 1185 * it, so adjust bookkeeping accordingly 1186 */ 1187 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { 1188 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; 1189 1190 if (!((key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | 1191 IEEE80211_KEY_FLAG_PUT_MIC_SPACE)) || 1192 (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) 1193 increment_tailroom_need_count(key->sdata); 1194 } 1195 1196 ieee80211_key_free(key, false); 1197 } 1198 EXPORT_SYMBOL_GPL(ieee80211_remove_key); 1199 1200 struct ieee80211_key_conf * 1201 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif, 1202 struct ieee80211_key_conf *keyconf) 1203 { 1204 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1205 struct ieee80211_local *local = sdata->local; 1206 struct ieee80211_key *key; 1207 int err; 1208 1209 if (WARN_ON(!local->wowlan)) 1210 return ERR_PTR(-EINVAL); 1211 1212 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 1213 return ERR_PTR(-EINVAL); 1214 1215 key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx, 1216 keyconf->keylen, keyconf->key, 1217 0, NULL, NULL); 1218 if (IS_ERR(key)) 1219 return ERR_CAST(key); 1220 1221 if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED) 1222 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT; 1223 1224 err = ieee80211_key_link(key, sdata, NULL); 1225 if (err) 1226 return ERR_PTR(err); 1227 1228 return &key->conf; 1229 } 1230 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add); 1231