1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2002-2005, Instant802 Networks, Inc. 4 * Copyright 2005-2006, Devicescape Software, Inc. 5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 6 * Copyright 2007-2008 Johannes Berg <johannes@sipsolutions.net> 7 * Copyright 2013-2014 Intel Mobile Communications GmbH 8 * Copyright 2015-2017 Intel Deutschland GmbH 9 * Copyright 2018-2020, 2022-2023 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 if (key->conf.link_id >= 0 && sdata->vif.active_links && 181 !(sdata->vif.active_links & BIT(key->conf.link_id))) 182 return 0; 183 184 ret = drv_set_key(key->local, SET_KEY, sdata, 185 sta ? &sta->sta : NULL, &key->conf); 186 187 if (!ret) { 188 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; 189 190 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | 191 IEEE80211_KEY_FLAG_PUT_MIC_SPACE | 192 IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) 193 decrease_tailroom_need_count(sdata, 1); 194 195 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && 196 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)); 197 198 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) && 199 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)); 200 201 return 0; 202 } 203 204 if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1) 205 sdata_err(sdata, 206 "failed to set key (%d, %pM) to hardware (%d)\n", 207 key->conf.keyidx, 208 sta ? sta->sta.addr : bcast_addr, ret); 209 210 out_unsupported: 211 switch (key->conf.cipher) { 212 case WLAN_CIPHER_SUITE_WEP40: 213 case WLAN_CIPHER_SUITE_WEP104: 214 case WLAN_CIPHER_SUITE_TKIP: 215 case WLAN_CIPHER_SUITE_CCMP: 216 case WLAN_CIPHER_SUITE_CCMP_256: 217 case WLAN_CIPHER_SUITE_GCMP: 218 case WLAN_CIPHER_SUITE_GCMP_256: 219 case WLAN_CIPHER_SUITE_AES_CMAC: 220 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 221 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 222 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 223 /* all of these we can do in software - if driver can */ 224 if (ret == 1) 225 return 0; 226 if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL)) 227 return -EINVAL; 228 return 0; 229 default: 230 return -EINVAL; 231 } 232 } 233 234 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key) 235 { 236 struct ieee80211_sub_if_data *sdata; 237 struct sta_info *sta; 238 int ret; 239 240 might_sleep(); 241 242 if (!key || !key->local->ops->set_key) 243 return; 244 245 assert_key_lock(key->local); 246 247 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 248 return; 249 250 sta = key->sta; 251 sdata = key->sdata; 252 253 if (key->conf.link_id >= 0 && sdata->vif.active_links && 254 !(sdata->vif.active_links & BIT(key->conf.link_id))) 255 return; 256 257 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | 258 IEEE80211_KEY_FLAG_PUT_MIC_SPACE | 259 IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) 260 increment_tailroom_need_count(sdata); 261 262 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; 263 ret = drv_set_key(key->local, DISABLE_KEY, sdata, 264 sta ? &sta->sta : NULL, &key->conf); 265 266 if (ret) 267 sdata_err(sdata, 268 "failed to remove key (%d, %pM) from hardware (%d)\n", 269 key->conf.keyidx, 270 sta ? sta->sta.addr : bcast_addr, ret); 271 } 272 273 static int _ieee80211_set_tx_key(struct ieee80211_key *key, bool force) 274 { 275 struct sta_info *sta = key->sta; 276 struct ieee80211_local *local = key->local; 277 278 assert_key_lock(local); 279 280 set_sta_flag(sta, WLAN_STA_USES_ENCRYPTION); 281 282 sta->ptk_idx = key->conf.keyidx; 283 284 if (force || !ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT)) 285 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 286 ieee80211_check_fast_xmit(sta); 287 288 return 0; 289 } 290 291 int ieee80211_set_tx_key(struct ieee80211_key *key) 292 { 293 return _ieee80211_set_tx_key(key, false); 294 } 295 296 static void ieee80211_pairwise_rekey(struct ieee80211_key *old, 297 struct ieee80211_key *new) 298 { 299 struct ieee80211_local *local = new->local; 300 struct sta_info *sta = new->sta; 301 int i; 302 303 assert_key_lock(local); 304 305 if (new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX) { 306 /* Extended Key ID key install, initial one or rekey */ 307 308 if (sta->ptk_idx != INVALID_PTK_KEYIDX && 309 !ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT)) { 310 /* Aggregation Sessions with Extended Key ID must not 311 * mix MPDUs with different keyIDs within one A-MPDU. 312 * Tear down running Tx aggregation sessions and block 313 * new Rx/Tx aggregation requests during rekey to 314 * ensure there are no A-MPDUs when the driver is not 315 * supporting A-MPDU key borders. (Blocking Tx only 316 * would be sufficient but WLAN_STA_BLOCK_BA gets the 317 * job done for the few ms we need it.) 318 */ 319 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 320 mutex_lock(&sta->ampdu_mlme.mtx); 321 for (i = 0; i < IEEE80211_NUM_TIDS; i++) 322 ___ieee80211_stop_tx_ba_session(sta, i, 323 AGG_STOP_LOCAL_REQUEST); 324 mutex_unlock(&sta->ampdu_mlme.mtx); 325 } 326 } else if (old) { 327 /* Rekey without Extended Key ID. 328 * Aggregation sessions are OK when running on SW crypto. 329 * A broken remote STA may cause issues not observed with HW 330 * crypto, though. 331 */ 332 if (!(old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 333 return; 334 335 /* Stop Tx till we are on the new key */ 336 old->flags |= KEY_FLAG_TAINTED; 337 ieee80211_clear_fast_xmit(sta); 338 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 339 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 340 ieee80211_sta_tear_down_BA_sessions(sta, 341 AGG_STOP_LOCAL_REQUEST); 342 } 343 if (!wiphy_ext_feature_isset(local->hw.wiphy, 344 NL80211_EXT_FEATURE_CAN_REPLACE_PTK0)) { 345 pr_warn_ratelimited("Rekeying PTK for STA %pM but driver can't safely do that.", 346 sta->sta.addr); 347 /* Flushing the driver queues *may* help prevent 348 * the clear text leaks and freezes. 349 */ 350 ieee80211_flush_queues(local, old->sdata, false); 351 } 352 } 353 } 354 355 static void __ieee80211_set_default_key(struct ieee80211_link_data *link, 356 int idx, bool uni, bool multi) 357 { 358 struct ieee80211_sub_if_data *sdata = link->sdata; 359 struct ieee80211_key *key = NULL; 360 361 assert_key_lock(sdata->local); 362 363 if (idx >= 0 && idx < NUM_DEFAULT_KEYS) { 364 key = key_mtx_dereference(sdata->local, sdata->keys[idx]); 365 if (!key) 366 key = key_mtx_dereference(sdata->local, link->gtk[idx]); 367 } 368 369 if (uni) { 370 rcu_assign_pointer(sdata->default_unicast_key, key); 371 ieee80211_check_fast_xmit_iface(sdata); 372 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 373 drv_set_default_unicast_key(sdata->local, sdata, idx); 374 } 375 376 if (multi) 377 rcu_assign_pointer(link->default_multicast_key, key); 378 379 ieee80211_debugfs_key_update_default(sdata); 380 } 381 382 void ieee80211_set_default_key(struct ieee80211_link_data *link, int idx, 383 bool uni, bool multi) 384 { 385 mutex_lock(&link->sdata->local->key_mtx); 386 __ieee80211_set_default_key(link, idx, uni, multi); 387 mutex_unlock(&link->sdata->local->key_mtx); 388 } 389 390 static void 391 __ieee80211_set_default_mgmt_key(struct ieee80211_link_data *link, int idx) 392 { 393 struct ieee80211_sub_if_data *sdata = link->sdata; 394 struct ieee80211_key *key = NULL; 395 396 assert_key_lock(sdata->local); 397 398 if (idx >= NUM_DEFAULT_KEYS && 399 idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 400 key = key_mtx_dereference(sdata->local, link->gtk[idx]); 401 402 rcu_assign_pointer(link->default_mgmt_key, key); 403 404 ieee80211_debugfs_key_update_default(sdata); 405 } 406 407 void ieee80211_set_default_mgmt_key(struct ieee80211_link_data *link, 408 int idx) 409 { 410 mutex_lock(&link->sdata->local->key_mtx); 411 __ieee80211_set_default_mgmt_key(link, idx); 412 mutex_unlock(&link->sdata->local->key_mtx); 413 } 414 415 static void 416 __ieee80211_set_default_beacon_key(struct ieee80211_link_data *link, int idx) 417 { 418 struct ieee80211_sub_if_data *sdata = link->sdata; 419 struct ieee80211_key *key = NULL; 420 421 assert_key_lock(sdata->local); 422 423 if (idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS && 424 idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS + 425 NUM_DEFAULT_BEACON_KEYS) 426 key = key_mtx_dereference(sdata->local, link->gtk[idx]); 427 428 rcu_assign_pointer(link->default_beacon_key, key); 429 430 ieee80211_debugfs_key_update_default(sdata); 431 } 432 433 void ieee80211_set_default_beacon_key(struct ieee80211_link_data *link, 434 int idx) 435 { 436 mutex_lock(&link->sdata->local->key_mtx); 437 __ieee80211_set_default_beacon_key(link, idx); 438 mutex_unlock(&link->sdata->local->key_mtx); 439 } 440 441 static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, 442 struct ieee80211_link_data *link, 443 struct sta_info *sta, 444 bool pairwise, 445 struct ieee80211_key *old, 446 struct ieee80211_key *new) 447 { 448 struct link_sta_info *link_sta = sta ? &sta->deflink : NULL; 449 int link_id; 450 int idx; 451 int ret = 0; 452 bool defunikey, defmultikey, defmgmtkey, defbeaconkey; 453 bool is_wep; 454 455 /* caller must provide at least one old/new */ 456 if (WARN_ON(!new && !old)) 457 return 0; 458 459 if (new) { 460 idx = new->conf.keyidx; 461 is_wep = new->conf.cipher == WLAN_CIPHER_SUITE_WEP40 || 462 new->conf.cipher == WLAN_CIPHER_SUITE_WEP104; 463 link_id = new->conf.link_id; 464 } else { 465 idx = old->conf.keyidx; 466 is_wep = old->conf.cipher == WLAN_CIPHER_SUITE_WEP40 || 467 old->conf.cipher == WLAN_CIPHER_SUITE_WEP104; 468 link_id = old->conf.link_id; 469 } 470 471 if (WARN(old && old->conf.link_id != link_id, 472 "old link ID %d doesn't match new link ID %d\n", 473 old->conf.link_id, link_id)) 474 return -EINVAL; 475 476 if (link_id >= 0) { 477 if (!link) { 478 link = sdata_dereference(sdata->link[link_id], sdata); 479 if (!link) 480 return -ENOLINK; 481 } 482 483 if (sta) { 484 link_sta = rcu_dereference_protected(sta->link[link_id], 485 lockdep_is_held(&sta->local->sta_mtx)); 486 if (!link_sta) 487 return -ENOLINK; 488 } 489 } else { 490 link = &sdata->deflink; 491 } 492 493 if ((is_wep || pairwise) && idx >= NUM_DEFAULT_KEYS) 494 return -EINVAL; 495 496 WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx); 497 498 if (new && sta && pairwise) { 499 /* Unicast rekey needs special handling. With Extended Key ID 500 * old is still NULL for the first rekey. 501 */ 502 ieee80211_pairwise_rekey(old, new); 503 } 504 505 if (old) { 506 if (old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { 507 ieee80211_key_disable_hw_accel(old); 508 509 if (new) 510 ret = ieee80211_key_enable_hw_accel(new); 511 } 512 } else { 513 if (!new->local->wowlan) { 514 ret = ieee80211_key_enable_hw_accel(new); 515 } else { 516 assert_key_lock(new->local); 517 new->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; 518 } 519 } 520 521 if (ret) 522 return ret; 523 524 if (new) 525 list_add_tail_rcu(&new->list, &sdata->key_list); 526 527 if (sta) { 528 if (pairwise) { 529 rcu_assign_pointer(sta->ptk[idx], new); 530 if (new && 531 !(new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX)) 532 _ieee80211_set_tx_key(new, true); 533 } else { 534 rcu_assign_pointer(link_sta->gtk[idx], new); 535 } 536 /* Only needed for transition from no key -> key. 537 * Still triggers unnecessary when using Extended Key ID 538 * and installing the second key ID the first time. 539 */ 540 if (new && !old) 541 ieee80211_check_fast_rx(sta); 542 } else { 543 defunikey = old && 544 old == key_mtx_dereference(sdata->local, 545 sdata->default_unicast_key); 546 defmultikey = old && 547 old == key_mtx_dereference(sdata->local, 548 link->default_multicast_key); 549 defmgmtkey = old && 550 old == key_mtx_dereference(sdata->local, 551 link->default_mgmt_key); 552 defbeaconkey = old && 553 old == key_mtx_dereference(sdata->local, 554 link->default_beacon_key); 555 556 if (defunikey && !new) 557 __ieee80211_set_default_key(link, -1, true, false); 558 if (defmultikey && !new) 559 __ieee80211_set_default_key(link, -1, false, true); 560 if (defmgmtkey && !new) 561 __ieee80211_set_default_mgmt_key(link, -1); 562 if (defbeaconkey && !new) 563 __ieee80211_set_default_beacon_key(link, -1); 564 565 if (is_wep || pairwise) 566 rcu_assign_pointer(sdata->keys[idx], new); 567 else 568 rcu_assign_pointer(link->gtk[idx], new); 569 570 if (defunikey && new) 571 __ieee80211_set_default_key(link, new->conf.keyidx, 572 true, false); 573 if (defmultikey && new) 574 __ieee80211_set_default_key(link, new->conf.keyidx, 575 false, true); 576 if (defmgmtkey && new) 577 __ieee80211_set_default_mgmt_key(link, 578 new->conf.keyidx); 579 if (defbeaconkey && new) 580 __ieee80211_set_default_beacon_key(link, 581 new->conf.keyidx); 582 } 583 584 if (old) 585 list_del_rcu(&old->list); 586 587 return 0; 588 } 589 590 struct ieee80211_key * 591 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, 592 const u8 *key_data, 593 size_t seq_len, const u8 *seq) 594 { 595 struct ieee80211_key *key; 596 int i, j, err; 597 598 if (WARN_ON(idx < 0 || 599 idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS + 600 NUM_DEFAULT_BEACON_KEYS)) 601 return ERR_PTR(-EINVAL); 602 603 key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); 604 if (!key) 605 return ERR_PTR(-ENOMEM); 606 607 /* 608 * Default to software encryption; we'll later upload the 609 * key to the hardware if possible. 610 */ 611 key->conf.flags = 0; 612 key->flags = 0; 613 614 key->conf.link_id = -1; 615 key->conf.cipher = cipher; 616 key->conf.keyidx = idx; 617 key->conf.keylen = key_len; 618 switch (cipher) { 619 case WLAN_CIPHER_SUITE_WEP40: 620 case WLAN_CIPHER_SUITE_WEP104: 621 key->conf.iv_len = IEEE80211_WEP_IV_LEN; 622 key->conf.icv_len = IEEE80211_WEP_ICV_LEN; 623 break; 624 case WLAN_CIPHER_SUITE_TKIP: 625 key->conf.iv_len = IEEE80211_TKIP_IV_LEN; 626 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN; 627 if (seq) { 628 for (i = 0; i < IEEE80211_NUM_TIDS; i++) { 629 key->u.tkip.rx[i].iv32 = 630 get_unaligned_le32(&seq[2]); 631 key->u.tkip.rx[i].iv16 = 632 get_unaligned_le16(seq); 633 } 634 } 635 spin_lock_init(&key->u.tkip.txlock); 636 break; 637 case WLAN_CIPHER_SUITE_CCMP: 638 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN; 639 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN; 640 if (seq) { 641 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) 642 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++) 643 key->u.ccmp.rx_pn[i][j] = 644 seq[IEEE80211_CCMP_PN_LEN - j - 1]; 645 } 646 /* 647 * Initialize AES key state here as an optimization so that 648 * it does not need to be initialized for every packet. 649 */ 650 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt( 651 key_data, key_len, IEEE80211_CCMP_MIC_LEN); 652 if (IS_ERR(key->u.ccmp.tfm)) { 653 err = PTR_ERR(key->u.ccmp.tfm); 654 kfree(key); 655 return ERR_PTR(err); 656 } 657 break; 658 case WLAN_CIPHER_SUITE_CCMP_256: 659 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN; 660 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN; 661 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++) 662 for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++) 663 key->u.ccmp.rx_pn[i][j] = 664 seq[IEEE80211_CCMP_256_PN_LEN - j - 1]; 665 /* Initialize AES key state here as an optimization so that 666 * it does not need to be initialized for every packet. 667 */ 668 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt( 669 key_data, key_len, IEEE80211_CCMP_256_MIC_LEN); 670 if (IS_ERR(key->u.ccmp.tfm)) { 671 err = PTR_ERR(key->u.ccmp.tfm); 672 kfree(key); 673 return ERR_PTR(err); 674 } 675 break; 676 case WLAN_CIPHER_SUITE_AES_CMAC: 677 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 678 key->conf.iv_len = 0; 679 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC) 680 key->conf.icv_len = sizeof(struct ieee80211_mmie); 681 else 682 key->conf.icv_len = sizeof(struct ieee80211_mmie_16); 683 if (seq) 684 for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++) 685 key->u.aes_cmac.rx_pn[j] = 686 seq[IEEE80211_CMAC_PN_LEN - j - 1]; 687 /* 688 * Initialize AES key state here as an optimization so that 689 * it does not need to be initialized for every packet. 690 */ 691 key->u.aes_cmac.tfm = 692 ieee80211_aes_cmac_key_setup(key_data, key_len); 693 if (IS_ERR(key->u.aes_cmac.tfm)) { 694 err = PTR_ERR(key->u.aes_cmac.tfm); 695 kfree(key); 696 return ERR_PTR(err); 697 } 698 break; 699 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 700 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 701 key->conf.iv_len = 0; 702 key->conf.icv_len = sizeof(struct ieee80211_mmie_16); 703 if (seq) 704 for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++) 705 key->u.aes_gmac.rx_pn[j] = 706 seq[IEEE80211_GMAC_PN_LEN - j - 1]; 707 /* Initialize AES key state here as an optimization so that 708 * it does not need to be initialized for every packet. 709 */ 710 key->u.aes_gmac.tfm = 711 ieee80211_aes_gmac_key_setup(key_data, key_len); 712 if (IS_ERR(key->u.aes_gmac.tfm)) { 713 err = PTR_ERR(key->u.aes_gmac.tfm); 714 kfree(key); 715 return ERR_PTR(err); 716 } 717 break; 718 case WLAN_CIPHER_SUITE_GCMP: 719 case WLAN_CIPHER_SUITE_GCMP_256: 720 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN; 721 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN; 722 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++) 723 for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++) 724 key->u.gcmp.rx_pn[i][j] = 725 seq[IEEE80211_GCMP_PN_LEN - j - 1]; 726 /* Initialize AES key state here as an optimization so that 727 * it does not need to be initialized for every packet. 728 */ 729 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data, 730 key_len); 731 if (IS_ERR(key->u.gcmp.tfm)) { 732 err = PTR_ERR(key->u.gcmp.tfm); 733 kfree(key); 734 return ERR_PTR(err); 735 } 736 break; 737 } 738 memcpy(key->conf.key, key_data, key_len); 739 INIT_LIST_HEAD(&key->list); 740 741 return key; 742 } 743 744 static void ieee80211_key_free_common(struct ieee80211_key *key) 745 { 746 switch (key->conf.cipher) { 747 case WLAN_CIPHER_SUITE_CCMP: 748 case WLAN_CIPHER_SUITE_CCMP_256: 749 ieee80211_aes_key_free(key->u.ccmp.tfm); 750 break; 751 case WLAN_CIPHER_SUITE_AES_CMAC: 752 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 753 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); 754 break; 755 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 756 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 757 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm); 758 break; 759 case WLAN_CIPHER_SUITE_GCMP: 760 case WLAN_CIPHER_SUITE_GCMP_256: 761 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm); 762 break; 763 } 764 kfree_sensitive(key); 765 } 766 767 static void __ieee80211_key_destroy(struct ieee80211_key *key, 768 bool delay_tailroom) 769 { 770 if (key->local) { 771 struct ieee80211_sub_if_data *sdata = key->sdata; 772 773 ieee80211_debugfs_key_remove(key); 774 775 if (delay_tailroom) { 776 /* see ieee80211_delayed_tailroom_dec */ 777 sdata->crypto_tx_tailroom_pending_dec++; 778 schedule_delayed_work(&sdata->dec_tailroom_needed_wk, 779 HZ/2); 780 } else { 781 decrease_tailroom_need_count(sdata, 1); 782 } 783 } 784 785 ieee80211_key_free_common(key); 786 } 787 788 static void ieee80211_key_destroy(struct ieee80211_key *key, 789 bool delay_tailroom) 790 { 791 if (!key) 792 return; 793 794 /* 795 * Synchronize so the TX path and rcu key iterators 796 * can no longer be using this key before we free/remove it. 797 */ 798 synchronize_net(); 799 800 __ieee80211_key_destroy(key, delay_tailroom); 801 } 802 803 void ieee80211_key_free_unused(struct ieee80211_key *key) 804 { 805 WARN_ON(key->sdata || key->local); 806 ieee80211_key_free_common(key); 807 } 808 809 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata, 810 struct ieee80211_key *old, 811 struct ieee80211_key *new) 812 { 813 u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP]; 814 u8 *tk_old, *tk_new; 815 816 if (!old || new->conf.keylen != old->conf.keylen) 817 return false; 818 819 tk_old = old->conf.key; 820 tk_new = new->conf.key; 821 822 /* 823 * In station mode, don't compare the TX MIC key, as it's never used 824 * and offloaded rekeying may not care to send it to the host. This 825 * is the case in iwlwifi, for example. 826 */ 827 if (sdata->vif.type == NL80211_IFTYPE_STATION && 828 new->conf.cipher == WLAN_CIPHER_SUITE_TKIP && 829 new->conf.keylen == WLAN_KEY_LEN_TKIP && 830 !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) { 831 memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP); 832 memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP); 833 memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8); 834 memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8); 835 tk_old = tkip_old; 836 tk_new = tkip_new; 837 } 838 839 return !crypto_memneq(tk_old, tk_new, new->conf.keylen); 840 } 841 842 int ieee80211_key_link(struct ieee80211_key *key, 843 struct ieee80211_link_data *link, 844 struct sta_info *sta) 845 { 846 struct ieee80211_sub_if_data *sdata = link->sdata; 847 static atomic_t key_color = ATOMIC_INIT(0); 848 struct ieee80211_key *old_key = NULL; 849 int idx = key->conf.keyidx; 850 bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE; 851 /* 852 * We want to delay tailroom updates only for station - in that 853 * case it helps roaming speed, but in other cases it hurts and 854 * can cause warnings to appear. 855 */ 856 bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION; 857 int ret = -EOPNOTSUPP; 858 859 mutex_lock(&sdata->local->key_mtx); 860 861 if (sta && pairwise) { 862 struct ieee80211_key *alt_key; 863 864 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]); 865 alt_key = key_mtx_dereference(sdata->local, sta->ptk[idx ^ 1]); 866 867 /* The rekey code assumes that the old and new key are using 868 * the same cipher. Enforce the assumption for pairwise keys. 869 */ 870 if ((alt_key && alt_key->conf.cipher != key->conf.cipher) || 871 (old_key && old_key->conf.cipher != key->conf.cipher)) 872 goto out; 873 } else if (sta) { 874 struct link_sta_info *link_sta = &sta->deflink; 875 int link_id = key->conf.link_id; 876 877 if (link_id >= 0) { 878 link_sta = rcu_dereference_protected(sta->link[link_id], 879 lockdep_is_held(&sta->local->sta_mtx)); 880 if (!link_sta) { 881 ret = -ENOLINK; 882 goto out; 883 } 884 } 885 886 old_key = key_mtx_dereference(sdata->local, link_sta->gtk[idx]); 887 } else { 888 if (idx < NUM_DEFAULT_KEYS) 889 old_key = key_mtx_dereference(sdata->local, 890 sdata->keys[idx]); 891 if (!old_key) 892 old_key = key_mtx_dereference(sdata->local, 893 link->gtk[idx]); 894 } 895 896 /* Non-pairwise keys must also not switch the cipher on rekey */ 897 if (!pairwise) { 898 if (old_key && old_key->conf.cipher != key->conf.cipher) 899 goto out; 900 } 901 902 /* 903 * Silently accept key re-installation without really installing the 904 * new version of the key to avoid nonce reuse or replay issues. 905 */ 906 if (ieee80211_key_identical(sdata, old_key, key)) { 907 ieee80211_key_free_unused(key); 908 ret = 0; 909 goto out; 910 } 911 912 key->local = sdata->local; 913 key->sdata = sdata; 914 key->sta = sta; 915 916 /* 917 * Assign a unique ID to every key so we can easily prevent mixed 918 * key and fragment cache attacks. 919 */ 920 key->color = atomic_inc_return(&key_color); 921 922 increment_tailroom_need_count(sdata); 923 924 ret = ieee80211_key_replace(sdata, link, sta, pairwise, old_key, key); 925 926 if (!ret) { 927 ieee80211_debugfs_key_add(key); 928 ieee80211_key_destroy(old_key, delay_tailroom); 929 } else { 930 ieee80211_key_free(key, delay_tailroom); 931 } 932 933 out: 934 mutex_unlock(&sdata->local->key_mtx); 935 936 return ret; 937 } 938 939 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom) 940 { 941 if (!key) 942 return; 943 944 /* 945 * Replace key with nothingness if it was ever used. 946 */ 947 if (key->sdata) 948 ieee80211_key_replace(key->sdata, NULL, key->sta, 949 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 950 key, NULL); 951 ieee80211_key_destroy(key, delay_tailroom); 952 } 953 954 void ieee80211_reenable_keys(struct ieee80211_sub_if_data *sdata) 955 { 956 struct ieee80211_key *key; 957 struct ieee80211_sub_if_data *vlan; 958 959 lockdep_assert_wiphy(sdata->local->hw.wiphy); 960 961 mutex_lock(&sdata->local->key_mtx); 962 963 sdata->crypto_tx_tailroom_needed_cnt = 0; 964 sdata->crypto_tx_tailroom_pending_dec = 0; 965 966 if (sdata->vif.type == NL80211_IFTYPE_AP) { 967 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) { 968 vlan->crypto_tx_tailroom_needed_cnt = 0; 969 vlan->crypto_tx_tailroom_pending_dec = 0; 970 } 971 } 972 973 if (ieee80211_sdata_running(sdata)) { 974 list_for_each_entry(key, &sdata->key_list, list) { 975 increment_tailroom_need_count(sdata); 976 ieee80211_key_enable_hw_accel(key); 977 } 978 } 979 980 mutex_unlock(&sdata->local->key_mtx); 981 } 982 983 void ieee80211_iter_keys(struct ieee80211_hw *hw, 984 struct ieee80211_vif *vif, 985 void (*iter)(struct ieee80211_hw *hw, 986 struct ieee80211_vif *vif, 987 struct ieee80211_sta *sta, 988 struct ieee80211_key_conf *key, 989 void *data), 990 void *iter_data) 991 { 992 struct ieee80211_local *local = hw_to_local(hw); 993 struct ieee80211_key *key, *tmp; 994 struct ieee80211_sub_if_data *sdata; 995 996 lockdep_assert_wiphy(hw->wiphy); 997 998 mutex_lock(&local->key_mtx); 999 if (vif) { 1000 sdata = vif_to_sdata(vif); 1001 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) 1002 iter(hw, &sdata->vif, 1003 key->sta ? &key->sta->sta : NULL, 1004 &key->conf, iter_data); 1005 } else { 1006 list_for_each_entry(sdata, &local->interfaces, list) 1007 list_for_each_entry_safe(key, tmp, 1008 &sdata->key_list, list) 1009 iter(hw, &sdata->vif, 1010 key->sta ? &key->sta->sta : NULL, 1011 &key->conf, iter_data); 1012 } 1013 mutex_unlock(&local->key_mtx); 1014 } 1015 EXPORT_SYMBOL(ieee80211_iter_keys); 1016 1017 static void 1018 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw, 1019 struct ieee80211_sub_if_data *sdata, 1020 void (*iter)(struct ieee80211_hw *hw, 1021 struct ieee80211_vif *vif, 1022 struct ieee80211_sta *sta, 1023 struct ieee80211_key_conf *key, 1024 void *data), 1025 void *iter_data) 1026 { 1027 struct ieee80211_key *key; 1028 1029 list_for_each_entry_rcu(key, &sdata->key_list, list) { 1030 /* skip keys of station in removal process */ 1031 if (key->sta && key->sta->removed) 1032 continue; 1033 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 1034 continue; 1035 1036 iter(hw, &sdata->vif, 1037 key->sta ? &key->sta->sta : NULL, 1038 &key->conf, iter_data); 1039 } 1040 } 1041 1042 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw, 1043 struct ieee80211_vif *vif, 1044 void (*iter)(struct ieee80211_hw *hw, 1045 struct ieee80211_vif *vif, 1046 struct ieee80211_sta *sta, 1047 struct ieee80211_key_conf *key, 1048 void *data), 1049 void *iter_data) 1050 { 1051 struct ieee80211_local *local = hw_to_local(hw); 1052 struct ieee80211_sub_if_data *sdata; 1053 1054 if (vif) { 1055 sdata = vif_to_sdata(vif); 1056 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data); 1057 } else { 1058 list_for_each_entry_rcu(sdata, &local->interfaces, list) 1059 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data); 1060 } 1061 } 1062 EXPORT_SYMBOL(ieee80211_iter_keys_rcu); 1063 1064 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata, 1065 struct list_head *keys) 1066 { 1067 struct ieee80211_key *key, *tmp; 1068 1069 decrease_tailroom_need_count(sdata, 1070 sdata->crypto_tx_tailroom_pending_dec); 1071 sdata->crypto_tx_tailroom_pending_dec = 0; 1072 1073 ieee80211_debugfs_key_remove_mgmt_default(sdata); 1074 ieee80211_debugfs_key_remove_beacon_default(sdata); 1075 1076 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) { 1077 ieee80211_key_replace(key->sdata, NULL, key->sta, 1078 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 1079 key, NULL); 1080 list_add_tail(&key->list, keys); 1081 } 1082 1083 ieee80211_debugfs_key_update_default(sdata); 1084 } 1085 1086 void ieee80211_remove_link_keys(struct ieee80211_link_data *link, 1087 struct list_head *keys) 1088 { 1089 struct ieee80211_sub_if_data *sdata = link->sdata; 1090 struct ieee80211_local *local = sdata->local; 1091 struct ieee80211_key *key, *tmp; 1092 1093 mutex_lock(&local->key_mtx); 1094 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) { 1095 if (key->conf.link_id != link->link_id) 1096 continue; 1097 ieee80211_key_replace(key->sdata, link, key->sta, 1098 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 1099 key, NULL); 1100 list_add_tail(&key->list, keys); 1101 } 1102 mutex_unlock(&local->key_mtx); 1103 } 1104 1105 void ieee80211_free_key_list(struct ieee80211_local *local, 1106 struct list_head *keys) 1107 { 1108 struct ieee80211_key *key, *tmp; 1109 1110 mutex_lock(&local->key_mtx); 1111 list_for_each_entry_safe(key, tmp, keys, list) 1112 __ieee80211_key_destroy(key, false); 1113 mutex_unlock(&local->key_mtx); 1114 } 1115 1116 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata, 1117 bool force_synchronize) 1118 { 1119 struct ieee80211_local *local = sdata->local; 1120 struct ieee80211_sub_if_data *vlan; 1121 struct ieee80211_sub_if_data *master; 1122 struct ieee80211_key *key, *tmp; 1123 LIST_HEAD(keys); 1124 1125 cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk); 1126 1127 mutex_lock(&local->key_mtx); 1128 1129 ieee80211_free_keys_iface(sdata, &keys); 1130 1131 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1132 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 1133 ieee80211_free_keys_iface(vlan, &keys); 1134 } 1135 1136 if (!list_empty(&keys) || force_synchronize) 1137 synchronize_net(); 1138 list_for_each_entry_safe(key, tmp, &keys, list) 1139 __ieee80211_key_destroy(key, false); 1140 1141 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1142 if (sdata->bss) { 1143 master = container_of(sdata->bss, 1144 struct ieee80211_sub_if_data, 1145 u.ap); 1146 1147 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt != 1148 master->crypto_tx_tailroom_needed_cnt); 1149 } 1150 } else { 1151 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || 1152 sdata->crypto_tx_tailroom_pending_dec); 1153 } 1154 1155 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1156 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 1157 WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt || 1158 vlan->crypto_tx_tailroom_pending_dec); 1159 } 1160 1161 mutex_unlock(&local->key_mtx); 1162 } 1163 1164 void ieee80211_free_sta_keys(struct ieee80211_local *local, 1165 struct sta_info *sta) 1166 { 1167 struct ieee80211_key *key; 1168 int i; 1169 1170 mutex_lock(&local->key_mtx); 1171 for (i = 0; i < ARRAY_SIZE(sta->deflink.gtk); i++) { 1172 key = key_mtx_dereference(local, sta->deflink.gtk[i]); 1173 if (!key) 1174 continue; 1175 ieee80211_key_replace(key->sdata, NULL, key->sta, 1176 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 1177 key, NULL); 1178 __ieee80211_key_destroy(key, key->sdata->vif.type == 1179 NL80211_IFTYPE_STATION); 1180 } 1181 1182 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 1183 key = key_mtx_dereference(local, sta->ptk[i]); 1184 if (!key) 1185 continue; 1186 ieee80211_key_replace(key->sdata, NULL, key->sta, 1187 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 1188 key, NULL); 1189 __ieee80211_key_destroy(key, key->sdata->vif.type == 1190 NL80211_IFTYPE_STATION); 1191 } 1192 1193 mutex_unlock(&local->key_mtx); 1194 } 1195 1196 void ieee80211_delayed_tailroom_dec(struct work_struct *wk) 1197 { 1198 struct ieee80211_sub_if_data *sdata; 1199 1200 sdata = container_of(wk, struct ieee80211_sub_if_data, 1201 dec_tailroom_needed_wk.work); 1202 1203 /* 1204 * The reason for the delayed tailroom needed decrementing is to 1205 * make roaming faster: during roaming, all keys are first deleted 1206 * and then new keys are installed. The first new key causes the 1207 * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes 1208 * the cost of synchronize_net() (which can be slow). Avoid this 1209 * by deferring the crypto_tx_tailroom_needed_cnt decrementing on 1210 * key removal for a while, so if we roam the value is larger than 1211 * zero and no 0->1 transition happens. 1212 * 1213 * The cost is that if the AP switching was from an AP with keys 1214 * to one without, we still allocate tailroom while it would no 1215 * longer be needed. However, in the typical (fast) roaming case 1216 * within an ESS this usually won't happen. 1217 */ 1218 1219 mutex_lock(&sdata->local->key_mtx); 1220 decrease_tailroom_need_count(sdata, 1221 sdata->crypto_tx_tailroom_pending_dec); 1222 sdata->crypto_tx_tailroom_pending_dec = 0; 1223 mutex_unlock(&sdata->local->key_mtx); 1224 } 1225 1226 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid, 1227 const u8 *replay_ctr, gfp_t gfp) 1228 { 1229 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1230 1231 trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr); 1232 1233 cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp); 1234 } 1235 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify); 1236 1237 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf, 1238 int tid, struct ieee80211_key_seq *seq) 1239 { 1240 struct ieee80211_key *key; 1241 const u8 *pn; 1242 1243 key = container_of(keyconf, struct ieee80211_key, conf); 1244 1245 switch (key->conf.cipher) { 1246 case WLAN_CIPHER_SUITE_TKIP: 1247 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) 1248 return; 1249 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32; 1250 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16; 1251 break; 1252 case WLAN_CIPHER_SUITE_CCMP: 1253 case WLAN_CIPHER_SUITE_CCMP_256: 1254 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1255 return; 1256 if (tid < 0) 1257 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; 1258 else 1259 pn = key->u.ccmp.rx_pn[tid]; 1260 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN); 1261 break; 1262 case WLAN_CIPHER_SUITE_AES_CMAC: 1263 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1264 if (WARN_ON(tid != 0)) 1265 return; 1266 pn = key->u.aes_cmac.rx_pn; 1267 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN); 1268 break; 1269 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1270 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1271 if (WARN_ON(tid != 0)) 1272 return; 1273 pn = key->u.aes_gmac.rx_pn; 1274 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN); 1275 break; 1276 case WLAN_CIPHER_SUITE_GCMP: 1277 case WLAN_CIPHER_SUITE_GCMP_256: 1278 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1279 return; 1280 if (tid < 0) 1281 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; 1282 else 1283 pn = key->u.gcmp.rx_pn[tid]; 1284 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN); 1285 break; 1286 } 1287 } 1288 EXPORT_SYMBOL(ieee80211_get_key_rx_seq); 1289 1290 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf, 1291 int tid, struct ieee80211_key_seq *seq) 1292 { 1293 struct ieee80211_key *key; 1294 u8 *pn; 1295 1296 key = container_of(keyconf, struct ieee80211_key, conf); 1297 1298 switch (key->conf.cipher) { 1299 case WLAN_CIPHER_SUITE_TKIP: 1300 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) 1301 return; 1302 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32; 1303 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16; 1304 break; 1305 case WLAN_CIPHER_SUITE_CCMP: 1306 case WLAN_CIPHER_SUITE_CCMP_256: 1307 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1308 return; 1309 if (tid < 0) 1310 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; 1311 else 1312 pn = key->u.ccmp.rx_pn[tid]; 1313 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN); 1314 break; 1315 case WLAN_CIPHER_SUITE_AES_CMAC: 1316 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1317 if (WARN_ON(tid != 0)) 1318 return; 1319 pn = key->u.aes_cmac.rx_pn; 1320 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN); 1321 break; 1322 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1323 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1324 if (WARN_ON(tid != 0)) 1325 return; 1326 pn = key->u.aes_gmac.rx_pn; 1327 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN); 1328 break; 1329 case WLAN_CIPHER_SUITE_GCMP: 1330 case WLAN_CIPHER_SUITE_GCMP_256: 1331 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1332 return; 1333 if (tid < 0) 1334 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; 1335 else 1336 pn = key->u.gcmp.rx_pn[tid]; 1337 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN); 1338 break; 1339 default: 1340 WARN_ON(1); 1341 break; 1342 } 1343 } 1344 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq); 1345 1346 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf) 1347 { 1348 struct ieee80211_key *key; 1349 1350 key = container_of(keyconf, struct ieee80211_key, conf); 1351 1352 assert_key_lock(key->local); 1353 1354 /* 1355 * if key was uploaded, we assume the driver will/has remove(d) 1356 * it, so adjust bookkeeping accordingly 1357 */ 1358 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { 1359 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; 1360 1361 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | 1362 IEEE80211_KEY_FLAG_PUT_MIC_SPACE | 1363 IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) 1364 increment_tailroom_need_count(key->sdata); 1365 } 1366 1367 ieee80211_key_free(key, false); 1368 } 1369 EXPORT_SYMBOL_GPL(ieee80211_remove_key); 1370 1371 struct ieee80211_key_conf * 1372 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif, 1373 struct ieee80211_key_conf *keyconf) 1374 { 1375 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1376 struct ieee80211_local *local = sdata->local; 1377 struct ieee80211_key *key; 1378 int err; 1379 1380 if (WARN_ON(!local->wowlan)) 1381 return ERR_PTR(-EINVAL); 1382 1383 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 1384 return ERR_PTR(-EINVAL); 1385 1386 key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx, 1387 keyconf->keylen, keyconf->key, 1388 0, NULL); 1389 if (IS_ERR(key)) 1390 return ERR_CAST(key); 1391 1392 if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED) 1393 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT; 1394 1395 /* FIXME: this function needs to get a link ID */ 1396 err = ieee80211_key_link(key, &sdata->deflink, NULL); 1397 if (err) 1398 return ERR_PTR(err); 1399 1400 return &key->conf; 1401 } 1402 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add); 1403 1404 void ieee80211_key_mic_failure(struct ieee80211_key_conf *keyconf) 1405 { 1406 struct ieee80211_key *key; 1407 1408 key = container_of(keyconf, struct ieee80211_key, conf); 1409 1410 switch (key->conf.cipher) { 1411 case WLAN_CIPHER_SUITE_AES_CMAC: 1412 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1413 key->u.aes_cmac.icverrors++; 1414 break; 1415 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1416 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1417 key->u.aes_gmac.icverrors++; 1418 break; 1419 default: 1420 /* ignore the others for now, we don't keep counters now */ 1421 break; 1422 } 1423 } 1424 EXPORT_SYMBOL_GPL(ieee80211_key_mic_failure); 1425 1426 void ieee80211_key_replay(struct ieee80211_key_conf *keyconf) 1427 { 1428 struct ieee80211_key *key; 1429 1430 key = container_of(keyconf, struct ieee80211_key, conf); 1431 1432 switch (key->conf.cipher) { 1433 case WLAN_CIPHER_SUITE_CCMP: 1434 case WLAN_CIPHER_SUITE_CCMP_256: 1435 key->u.ccmp.replays++; 1436 break; 1437 case WLAN_CIPHER_SUITE_AES_CMAC: 1438 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1439 key->u.aes_cmac.replays++; 1440 break; 1441 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1442 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1443 key->u.aes_gmac.replays++; 1444 break; 1445 case WLAN_CIPHER_SUITE_GCMP: 1446 case WLAN_CIPHER_SUITE_GCMP_256: 1447 key->u.gcmp.replays++; 1448 break; 1449 } 1450 } 1451 EXPORT_SYMBOL_GPL(ieee80211_key_replay); 1452 1453 int ieee80211_key_switch_links(struct ieee80211_sub_if_data *sdata, 1454 unsigned long del_links_mask, 1455 unsigned long add_links_mask) 1456 { 1457 struct ieee80211_key *key; 1458 int ret; 1459 1460 list_for_each_entry(key, &sdata->key_list, list) { 1461 if (key->conf.link_id < 0 || 1462 !(del_links_mask & BIT(key->conf.link_id))) 1463 continue; 1464 1465 /* shouldn't happen for per-link keys */ 1466 WARN_ON(key->sta); 1467 1468 ieee80211_key_disable_hw_accel(key); 1469 } 1470 1471 list_for_each_entry(key, &sdata->key_list, list) { 1472 if (key->conf.link_id < 0 || 1473 !(add_links_mask & BIT(key->conf.link_id))) 1474 continue; 1475 1476 /* shouldn't happen for per-link keys */ 1477 WARN_ON(key->sta); 1478 1479 ret = ieee80211_key_enable_hw_accel(key); 1480 if (ret) 1481 return ret; 1482 } 1483 1484 return 0; 1485 } 1486