1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2002-2005, Instant802 Networks, Inc. 4 * Copyright 2005-2006, Devicescape Software, Inc. 5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 6 * Copyright 2007-2008 Johannes Berg <johannes@sipsolutions.net> 7 * Copyright 2013-2014 Intel Mobile Communications GmbH 8 * Copyright 2015-2017 Intel Deutschland GmbH 9 * Copyright 2018-2020, 2022 Intel Corporation 10 */ 11 12 #include <linux/if_ether.h> 13 #include <linux/etherdevice.h> 14 #include <linux/list.h> 15 #include <linux/rcupdate.h> 16 #include <linux/rtnetlink.h> 17 #include <linux/slab.h> 18 #include <linux/export.h> 19 #include <net/mac80211.h> 20 #include <crypto/algapi.h> 21 #include <asm/unaligned.h> 22 #include "ieee80211_i.h" 23 #include "driver-ops.h" 24 #include "debugfs_key.h" 25 #include "aes_ccm.h" 26 #include "aes_cmac.h" 27 #include "aes_gmac.h" 28 #include "aes_gcm.h" 29 30 31 /** 32 * DOC: Key handling basics 33 * 34 * Key handling in mac80211 is done based on per-interface (sub_if_data) 35 * keys and per-station keys. Since each station belongs to an interface, 36 * each station key also belongs to that interface. 37 * 38 * Hardware acceleration is done on a best-effort basis for algorithms 39 * that are implemented in software, for each key the hardware is asked 40 * to enable that key for offloading but if it cannot do that the key is 41 * simply kept for software encryption (unless it is for an algorithm 42 * that isn't implemented in software). 43 * There is currently no way of knowing whether a key is handled in SW 44 * or HW except by looking into debugfs. 45 * 46 * All key management is internally protected by a mutex. Within all 47 * other parts of mac80211, key references are, just as STA structure 48 * references, protected by RCU. Note, however, that some things are 49 * unprotected, namely the key->sta dereferences within the hardware 50 * acceleration functions. This means that sta_info_destroy() must 51 * remove the key which waits for an RCU grace period. 52 */ 53 54 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; 55 56 static void assert_key_lock(struct ieee80211_local *local) 57 { 58 lockdep_assert_held(&local->key_mtx); 59 } 60 61 static void 62 update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta) 63 { 64 struct ieee80211_sub_if_data *vlan; 65 66 if (sdata->vif.type != NL80211_IFTYPE_AP) 67 return; 68 69 /* crypto_tx_tailroom_needed_cnt is protected by this */ 70 assert_key_lock(sdata->local); 71 72 rcu_read_lock(); 73 74 list_for_each_entry_rcu(vlan, &sdata->u.ap.vlans, u.vlan.list) 75 vlan->crypto_tx_tailroom_needed_cnt += delta; 76 77 rcu_read_unlock(); 78 } 79 80 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata) 81 { 82 /* 83 * When this count is zero, SKB resizing for allocating tailroom 84 * for IV or MMIC is skipped. But, this check has created two race 85 * cases in xmit path while transiting from zero count to one: 86 * 87 * 1. SKB resize was skipped because no key was added but just before 88 * the xmit key is added and SW encryption kicks off. 89 * 90 * 2. SKB resize was skipped because all the keys were hw planted but 91 * just before xmit one of the key is deleted and SW encryption kicks 92 * off. 93 * 94 * In both the above case SW encryption will find not enough space for 95 * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c) 96 * 97 * Solution has been explained at 98 * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net 99 */ 100 101 assert_key_lock(sdata->local); 102 103 update_vlan_tailroom_need_count(sdata, 1); 104 105 if (!sdata->crypto_tx_tailroom_needed_cnt++) { 106 /* 107 * Flush all XMIT packets currently using HW encryption or no 108 * encryption at all if the count transition is from 0 -> 1. 109 */ 110 synchronize_net(); 111 } 112 } 113 114 static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata, 115 int delta) 116 { 117 assert_key_lock(sdata->local); 118 119 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta); 120 121 update_vlan_tailroom_need_count(sdata, -delta); 122 sdata->crypto_tx_tailroom_needed_cnt -= delta; 123 } 124 125 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key) 126 { 127 struct ieee80211_sub_if_data *sdata = key->sdata; 128 struct sta_info *sta; 129 int ret = -EOPNOTSUPP; 130 131 might_sleep(); 132 133 if (key->flags & KEY_FLAG_TAINTED) { 134 /* If we get here, it's during resume and the key is 135 * tainted so shouldn't be used/programmed any more. 136 * However, its flags may still indicate that it was 137 * programmed into the device (since we're in resume) 138 * so clear that flag now to avoid trying to remove 139 * it again later. 140 */ 141 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE && 142 !(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | 143 IEEE80211_KEY_FLAG_PUT_MIC_SPACE | 144 IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) 145 increment_tailroom_need_count(sdata); 146 147 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; 148 return -EINVAL; 149 } 150 151 if (!key->local->ops->set_key) 152 goto out_unsupported; 153 154 assert_key_lock(key->local); 155 156 sta = key->sta; 157 158 /* 159 * If this is a per-STA GTK, check if it 160 * is supported; if not, return. 161 */ 162 if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) && 163 !ieee80211_hw_check(&key->local->hw, SUPPORTS_PER_STA_GTK)) 164 goto out_unsupported; 165 166 if (sta && !sta->uploaded) 167 goto out_unsupported; 168 169 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 170 /* 171 * The driver doesn't know anything about VLAN interfaces. 172 * Hence, don't send GTKs for VLAN interfaces to the driver. 173 */ 174 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) { 175 ret = 1; 176 goto out_unsupported; 177 } 178 } 179 180 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 } 516 517 if (ret) 518 return ret; 519 520 if (new) 521 list_add_tail_rcu(&new->list, &sdata->key_list); 522 523 if (sta) { 524 if (pairwise) { 525 rcu_assign_pointer(sta->ptk[idx], new); 526 if (new && 527 !(new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX)) 528 _ieee80211_set_tx_key(new, true); 529 } else { 530 rcu_assign_pointer(link_sta->gtk[idx], new); 531 } 532 /* Only needed for transition from no key -> key. 533 * Still triggers unnecessary when using Extended Key ID 534 * and installing the second key ID the first time. 535 */ 536 if (new && !old) 537 ieee80211_check_fast_rx(sta); 538 } else { 539 defunikey = old && 540 old == key_mtx_dereference(sdata->local, 541 sdata->default_unicast_key); 542 defmultikey = old && 543 old == key_mtx_dereference(sdata->local, 544 link->default_multicast_key); 545 defmgmtkey = old && 546 old == key_mtx_dereference(sdata->local, 547 link->default_mgmt_key); 548 defbeaconkey = old && 549 old == key_mtx_dereference(sdata->local, 550 link->default_beacon_key); 551 552 if (defunikey && !new) 553 __ieee80211_set_default_key(link, -1, true, false); 554 if (defmultikey && !new) 555 __ieee80211_set_default_key(link, -1, false, true); 556 if (defmgmtkey && !new) 557 __ieee80211_set_default_mgmt_key(link, -1); 558 if (defbeaconkey && !new) 559 __ieee80211_set_default_beacon_key(link, -1); 560 561 if (is_wep || pairwise) 562 rcu_assign_pointer(sdata->keys[idx], new); 563 else 564 rcu_assign_pointer(link->gtk[idx], new); 565 566 if (defunikey && new) 567 __ieee80211_set_default_key(link, new->conf.keyidx, 568 true, false); 569 if (defmultikey && new) 570 __ieee80211_set_default_key(link, new->conf.keyidx, 571 false, true); 572 if (defmgmtkey && new) 573 __ieee80211_set_default_mgmt_key(link, 574 new->conf.keyidx); 575 if (defbeaconkey && new) 576 __ieee80211_set_default_beacon_key(link, 577 new->conf.keyidx); 578 } 579 580 if (old) 581 list_del_rcu(&old->list); 582 583 return 0; 584 } 585 586 struct ieee80211_key * 587 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, 588 const u8 *key_data, 589 size_t seq_len, const u8 *seq) 590 { 591 struct ieee80211_key *key; 592 int i, j, err; 593 594 if (WARN_ON(idx < 0 || 595 idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS + 596 NUM_DEFAULT_BEACON_KEYS)) 597 return ERR_PTR(-EINVAL); 598 599 key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); 600 if (!key) 601 return ERR_PTR(-ENOMEM); 602 603 /* 604 * Default to software encryption; we'll later upload the 605 * key to the hardware if possible. 606 */ 607 key->conf.flags = 0; 608 key->flags = 0; 609 610 key->conf.link_id = -1; 611 key->conf.cipher = cipher; 612 key->conf.keyidx = idx; 613 key->conf.keylen = key_len; 614 switch (cipher) { 615 case WLAN_CIPHER_SUITE_WEP40: 616 case WLAN_CIPHER_SUITE_WEP104: 617 key->conf.iv_len = IEEE80211_WEP_IV_LEN; 618 key->conf.icv_len = IEEE80211_WEP_ICV_LEN; 619 break; 620 case WLAN_CIPHER_SUITE_TKIP: 621 key->conf.iv_len = IEEE80211_TKIP_IV_LEN; 622 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN; 623 if (seq) { 624 for (i = 0; i < IEEE80211_NUM_TIDS; i++) { 625 key->u.tkip.rx[i].iv32 = 626 get_unaligned_le32(&seq[2]); 627 key->u.tkip.rx[i].iv16 = 628 get_unaligned_le16(seq); 629 } 630 } 631 spin_lock_init(&key->u.tkip.txlock); 632 break; 633 case WLAN_CIPHER_SUITE_CCMP: 634 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN; 635 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN; 636 if (seq) { 637 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) 638 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++) 639 key->u.ccmp.rx_pn[i][j] = 640 seq[IEEE80211_CCMP_PN_LEN - j - 1]; 641 } 642 /* 643 * Initialize AES key state here as an optimization so that 644 * it does not need to be initialized for every packet. 645 */ 646 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt( 647 key_data, key_len, IEEE80211_CCMP_MIC_LEN); 648 if (IS_ERR(key->u.ccmp.tfm)) { 649 err = PTR_ERR(key->u.ccmp.tfm); 650 kfree(key); 651 return ERR_PTR(err); 652 } 653 break; 654 case WLAN_CIPHER_SUITE_CCMP_256: 655 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN; 656 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN; 657 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++) 658 for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++) 659 key->u.ccmp.rx_pn[i][j] = 660 seq[IEEE80211_CCMP_256_PN_LEN - j - 1]; 661 /* Initialize AES key state here as an optimization so that 662 * it does not need to be initialized for every packet. 663 */ 664 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt( 665 key_data, key_len, IEEE80211_CCMP_256_MIC_LEN); 666 if (IS_ERR(key->u.ccmp.tfm)) { 667 err = PTR_ERR(key->u.ccmp.tfm); 668 kfree(key); 669 return ERR_PTR(err); 670 } 671 break; 672 case WLAN_CIPHER_SUITE_AES_CMAC: 673 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 674 key->conf.iv_len = 0; 675 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC) 676 key->conf.icv_len = sizeof(struct ieee80211_mmie); 677 else 678 key->conf.icv_len = sizeof(struct ieee80211_mmie_16); 679 if (seq) 680 for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++) 681 key->u.aes_cmac.rx_pn[j] = 682 seq[IEEE80211_CMAC_PN_LEN - j - 1]; 683 /* 684 * Initialize AES key state here as an optimization so that 685 * it does not need to be initialized for every packet. 686 */ 687 key->u.aes_cmac.tfm = 688 ieee80211_aes_cmac_key_setup(key_data, key_len); 689 if (IS_ERR(key->u.aes_cmac.tfm)) { 690 err = PTR_ERR(key->u.aes_cmac.tfm); 691 kfree(key); 692 return ERR_PTR(err); 693 } 694 break; 695 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 696 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 697 key->conf.iv_len = 0; 698 key->conf.icv_len = sizeof(struct ieee80211_mmie_16); 699 if (seq) 700 for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++) 701 key->u.aes_gmac.rx_pn[j] = 702 seq[IEEE80211_GMAC_PN_LEN - j - 1]; 703 /* Initialize AES key state here as an optimization so that 704 * it does not need to be initialized for every packet. 705 */ 706 key->u.aes_gmac.tfm = 707 ieee80211_aes_gmac_key_setup(key_data, key_len); 708 if (IS_ERR(key->u.aes_gmac.tfm)) { 709 err = PTR_ERR(key->u.aes_gmac.tfm); 710 kfree(key); 711 return ERR_PTR(err); 712 } 713 break; 714 case WLAN_CIPHER_SUITE_GCMP: 715 case WLAN_CIPHER_SUITE_GCMP_256: 716 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN; 717 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN; 718 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++) 719 for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++) 720 key->u.gcmp.rx_pn[i][j] = 721 seq[IEEE80211_GCMP_PN_LEN - j - 1]; 722 /* Initialize AES key state here as an optimization so that 723 * it does not need to be initialized for every packet. 724 */ 725 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data, 726 key_len); 727 if (IS_ERR(key->u.gcmp.tfm)) { 728 err = PTR_ERR(key->u.gcmp.tfm); 729 kfree(key); 730 return ERR_PTR(err); 731 } 732 break; 733 } 734 memcpy(key->conf.key, key_data, key_len); 735 INIT_LIST_HEAD(&key->list); 736 737 return key; 738 } 739 740 static void ieee80211_key_free_common(struct ieee80211_key *key) 741 { 742 switch (key->conf.cipher) { 743 case WLAN_CIPHER_SUITE_CCMP: 744 case WLAN_CIPHER_SUITE_CCMP_256: 745 ieee80211_aes_key_free(key->u.ccmp.tfm); 746 break; 747 case WLAN_CIPHER_SUITE_AES_CMAC: 748 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 749 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); 750 break; 751 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 752 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 753 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm); 754 break; 755 case WLAN_CIPHER_SUITE_GCMP: 756 case WLAN_CIPHER_SUITE_GCMP_256: 757 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm); 758 break; 759 } 760 kfree_sensitive(key); 761 } 762 763 static void __ieee80211_key_destroy(struct ieee80211_key *key, 764 bool delay_tailroom) 765 { 766 if (key->local) { 767 struct ieee80211_sub_if_data *sdata = key->sdata; 768 769 ieee80211_debugfs_key_remove(key); 770 771 if (delay_tailroom) { 772 /* see ieee80211_delayed_tailroom_dec */ 773 sdata->crypto_tx_tailroom_pending_dec++; 774 schedule_delayed_work(&sdata->dec_tailroom_needed_wk, 775 HZ/2); 776 } else { 777 decrease_tailroom_need_count(sdata, 1); 778 } 779 } 780 781 ieee80211_key_free_common(key); 782 } 783 784 static void ieee80211_key_destroy(struct ieee80211_key *key, 785 bool delay_tailroom) 786 { 787 if (!key) 788 return; 789 790 /* 791 * Synchronize so the TX path and rcu key iterators 792 * can no longer be using this key before we free/remove it. 793 */ 794 synchronize_net(); 795 796 __ieee80211_key_destroy(key, delay_tailroom); 797 } 798 799 void ieee80211_key_free_unused(struct ieee80211_key *key) 800 { 801 WARN_ON(key->sdata || key->local); 802 ieee80211_key_free_common(key); 803 } 804 805 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata, 806 struct ieee80211_key *old, 807 struct ieee80211_key *new) 808 { 809 u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP]; 810 u8 *tk_old, *tk_new; 811 812 if (!old || new->conf.keylen != old->conf.keylen) 813 return false; 814 815 tk_old = old->conf.key; 816 tk_new = new->conf.key; 817 818 /* 819 * In station mode, don't compare the TX MIC key, as it's never used 820 * and offloaded rekeying may not care to send it to the host. This 821 * is the case in iwlwifi, for example. 822 */ 823 if (sdata->vif.type == NL80211_IFTYPE_STATION && 824 new->conf.cipher == WLAN_CIPHER_SUITE_TKIP && 825 new->conf.keylen == WLAN_KEY_LEN_TKIP && 826 !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) { 827 memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP); 828 memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP); 829 memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8); 830 memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8); 831 tk_old = tkip_old; 832 tk_new = tkip_new; 833 } 834 835 return !crypto_memneq(tk_old, tk_new, new->conf.keylen); 836 } 837 838 int ieee80211_key_link(struct ieee80211_key *key, 839 struct ieee80211_link_data *link, 840 struct sta_info *sta) 841 { 842 struct ieee80211_sub_if_data *sdata = link->sdata; 843 static atomic_t key_color = ATOMIC_INIT(0); 844 struct ieee80211_key *old_key = NULL; 845 int idx = key->conf.keyidx; 846 bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE; 847 /* 848 * We want to delay tailroom updates only for station - in that 849 * case it helps roaming speed, but in other cases it hurts and 850 * can cause warnings to appear. 851 */ 852 bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION; 853 int ret = -EOPNOTSUPP; 854 855 mutex_lock(&sdata->local->key_mtx); 856 857 if (sta && pairwise) { 858 struct ieee80211_key *alt_key; 859 860 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]); 861 alt_key = key_mtx_dereference(sdata->local, sta->ptk[idx ^ 1]); 862 863 /* The rekey code assumes that the old and new key are using 864 * the same cipher. Enforce the assumption for pairwise keys. 865 */ 866 if ((alt_key && alt_key->conf.cipher != key->conf.cipher) || 867 (old_key && old_key->conf.cipher != key->conf.cipher)) 868 goto out; 869 } else if (sta) { 870 struct link_sta_info *link_sta = &sta->deflink; 871 int link_id = key->conf.link_id; 872 873 if (link_id >= 0) { 874 link_sta = rcu_dereference_protected(sta->link[link_id], 875 lockdep_is_held(&sta->local->sta_mtx)); 876 if (!link_sta) { 877 ret = -ENOLINK; 878 goto out; 879 } 880 } 881 882 old_key = key_mtx_dereference(sdata->local, link_sta->gtk[idx]); 883 } else { 884 if (idx < NUM_DEFAULT_KEYS) 885 old_key = key_mtx_dereference(sdata->local, 886 sdata->keys[idx]); 887 if (!old_key) 888 old_key = key_mtx_dereference(sdata->local, 889 link->gtk[idx]); 890 } 891 892 /* Non-pairwise keys must also not switch the cipher on rekey */ 893 if (!pairwise) { 894 if (old_key && old_key->conf.cipher != key->conf.cipher) 895 goto out; 896 } 897 898 /* 899 * Silently accept key re-installation without really installing the 900 * new version of the key to avoid nonce reuse or replay issues. 901 */ 902 if (ieee80211_key_identical(sdata, old_key, key)) { 903 ieee80211_key_free_unused(key); 904 ret = 0; 905 goto out; 906 } 907 908 key->local = sdata->local; 909 key->sdata = sdata; 910 key->sta = sta; 911 912 /* 913 * Assign a unique ID to every key so we can easily prevent mixed 914 * key and fragment cache attacks. 915 */ 916 key->color = atomic_inc_return(&key_color); 917 918 increment_tailroom_need_count(sdata); 919 920 ret = ieee80211_key_replace(sdata, link, sta, pairwise, old_key, key); 921 922 if (!ret) { 923 ieee80211_debugfs_key_add(key); 924 ieee80211_key_destroy(old_key, delay_tailroom); 925 } else { 926 ieee80211_key_free(key, delay_tailroom); 927 } 928 929 out: 930 mutex_unlock(&sdata->local->key_mtx); 931 932 return ret; 933 } 934 935 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom) 936 { 937 if (!key) 938 return; 939 940 /* 941 * Replace key with nothingness if it was ever used. 942 */ 943 if (key->sdata) 944 ieee80211_key_replace(key->sdata, NULL, key->sta, 945 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 946 key, NULL); 947 ieee80211_key_destroy(key, delay_tailroom); 948 } 949 950 void ieee80211_reenable_keys(struct ieee80211_sub_if_data *sdata) 951 { 952 struct ieee80211_key *key; 953 struct ieee80211_sub_if_data *vlan; 954 955 lockdep_assert_wiphy(sdata->local->hw.wiphy); 956 957 mutex_lock(&sdata->local->key_mtx); 958 959 sdata->crypto_tx_tailroom_needed_cnt = 0; 960 sdata->crypto_tx_tailroom_pending_dec = 0; 961 962 if (sdata->vif.type == NL80211_IFTYPE_AP) { 963 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) { 964 vlan->crypto_tx_tailroom_needed_cnt = 0; 965 vlan->crypto_tx_tailroom_pending_dec = 0; 966 } 967 } 968 969 if (ieee80211_sdata_running(sdata)) { 970 list_for_each_entry(key, &sdata->key_list, list) { 971 increment_tailroom_need_count(sdata); 972 ieee80211_key_enable_hw_accel(key); 973 } 974 } 975 976 mutex_unlock(&sdata->local->key_mtx); 977 } 978 979 void ieee80211_iter_keys(struct ieee80211_hw *hw, 980 struct ieee80211_vif *vif, 981 void (*iter)(struct ieee80211_hw *hw, 982 struct ieee80211_vif *vif, 983 struct ieee80211_sta *sta, 984 struct ieee80211_key_conf *key, 985 void *data), 986 void *iter_data) 987 { 988 struct ieee80211_local *local = hw_to_local(hw); 989 struct ieee80211_key *key, *tmp; 990 struct ieee80211_sub_if_data *sdata; 991 992 lockdep_assert_wiphy(hw->wiphy); 993 994 mutex_lock(&local->key_mtx); 995 if (vif) { 996 sdata = vif_to_sdata(vif); 997 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) 998 iter(hw, &sdata->vif, 999 key->sta ? &key->sta->sta : NULL, 1000 &key->conf, iter_data); 1001 } else { 1002 list_for_each_entry(sdata, &local->interfaces, list) 1003 list_for_each_entry_safe(key, tmp, 1004 &sdata->key_list, list) 1005 iter(hw, &sdata->vif, 1006 key->sta ? &key->sta->sta : NULL, 1007 &key->conf, iter_data); 1008 } 1009 mutex_unlock(&local->key_mtx); 1010 } 1011 EXPORT_SYMBOL(ieee80211_iter_keys); 1012 1013 static void 1014 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw, 1015 struct ieee80211_sub_if_data *sdata, 1016 void (*iter)(struct ieee80211_hw *hw, 1017 struct ieee80211_vif *vif, 1018 struct ieee80211_sta *sta, 1019 struct ieee80211_key_conf *key, 1020 void *data), 1021 void *iter_data) 1022 { 1023 struct ieee80211_key *key; 1024 1025 list_for_each_entry_rcu(key, &sdata->key_list, list) { 1026 /* skip keys of station in removal process */ 1027 if (key->sta && key->sta->removed) 1028 continue; 1029 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 1030 continue; 1031 1032 iter(hw, &sdata->vif, 1033 key->sta ? &key->sta->sta : NULL, 1034 &key->conf, iter_data); 1035 } 1036 } 1037 1038 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw, 1039 struct ieee80211_vif *vif, 1040 void (*iter)(struct ieee80211_hw *hw, 1041 struct ieee80211_vif *vif, 1042 struct ieee80211_sta *sta, 1043 struct ieee80211_key_conf *key, 1044 void *data), 1045 void *iter_data) 1046 { 1047 struct ieee80211_local *local = hw_to_local(hw); 1048 struct ieee80211_sub_if_data *sdata; 1049 1050 if (vif) { 1051 sdata = vif_to_sdata(vif); 1052 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data); 1053 } else { 1054 list_for_each_entry_rcu(sdata, &local->interfaces, list) 1055 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data); 1056 } 1057 } 1058 EXPORT_SYMBOL(ieee80211_iter_keys_rcu); 1059 1060 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata, 1061 struct list_head *keys) 1062 { 1063 struct ieee80211_key *key, *tmp; 1064 1065 decrease_tailroom_need_count(sdata, 1066 sdata->crypto_tx_tailroom_pending_dec); 1067 sdata->crypto_tx_tailroom_pending_dec = 0; 1068 1069 ieee80211_debugfs_key_remove_mgmt_default(sdata); 1070 ieee80211_debugfs_key_remove_beacon_default(sdata); 1071 1072 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) { 1073 ieee80211_key_replace(key->sdata, NULL, key->sta, 1074 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 1075 key, NULL); 1076 list_add_tail(&key->list, keys); 1077 } 1078 1079 ieee80211_debugfs_key_update_default(sdata); 1080 } 1081 1082 void ieee80211_remove_link_keys(struct ieee80211_link_data *link, 1083 struct list_head *keys) 1084 { 1085 struct ieee80211_sub_if_data *sdata = link->sdata; 1086 struct ieee80211_local *local = sdata->local; 1087 struct ieee80211_key *key, *tmp; 1088 1089 mutex_lock(&local->key_mtx); 1090 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) { 1091 if (key->conf.link_id != link->link_id) 1092 continue; 1093 ieee80211_key_replace(key->sdata, link, key->sta, 1094 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 1095 key, NULL); 1096 list_add_tail(&key->list, keys); 1097 } 1098 mutex_unlock(&local->key_mtx); 1099 } 1100 1101 void ieee80211_free_key_list(struct ieee80211_local *local, 1102 struct list_head *keys) 1103 { 1104 struct ieee80211_key *key, *tmp; 1105 1106 mutex_lock(&local->key_mtx); 1107 list_for_each_entry_safe(key, tmp, keys, list) 1108 __ieee80211_key_destroy(key, false); 1109 mutex_unlock(&local->key_mtx); 1110 } 1111 1112 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata, 1113 bool force_synchronize) 1114 { 1115 struct ieee80211_local *local = sdata->local; 1116 struct ieee80211_sub_if_data *vlan; 1117 struct ieee80211_sub_if_data *master; 1118 struct ieee80211_key *key, *tmp; 1119 LIST_HEAD(keys); 1120 1121 cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk); 1122 1123 mutex_lock(&local->key_mtx); 1124 1125 ieee80211_free_keys_iface(sdata, &keys); 1126 1127 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1128 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 1129 ieee80211_free_keys_iface(vlan, &keys); 1130 } 1131 1132 if (!list_empty(&keys) || force_synchronize) 1133 synchronize_net(); 1134 list_for_each_entry_safe(key, tmp, &keys, list) 1135 __ieee80211_key_destroy(key, false); 1136 1137 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1138 if (sdata->bss) { 1139 master = container_of(sdata->bss, 1140 struct ieee80211_sub_if_data, 1141 u.ap); 1142 1143 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt != 1144 master->crypto_tx_tailroom_needed_cnt); 1145 } 1146 } else { 1147 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || 1148 sdata->crypto_tx_tailroom_pending_dec); 1149 } 1150 1151 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1152 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 1153 WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt || 1154 vlan->crypto_tx_tailroom_pending_dec); 1155 } 1156 1157 mutex_unlock(&local->key_mtx); 1158 } 1159 1160 void ieee80211_free_sta_keys(struct ieee80211_local *local, 1161 struct sta_info *sta) 1162 { 1163 struct ieee80211_key *key; 1164 int i; 1165 1166 mutex_lock(&local->key_mtx); 1167 for (i = 0; i < ARRAY_SIZE(sta->deflink.gtk); i++) { 1168 key = key_mtx_dereference(local, sta->deflink.gtk[i]); 1169 if (!key) 1170 continue; 1171 ieee80211_key_replace(key->sdata, NULL, key->sta, 1172 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 1173 key, NULL); 1174 __ieee80211_key_destroy(key, key->sdata->vif.type == 1175 NL80211_IFTYPE_STATION); 1176 } 1177 1178 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 1179 key = key_mtx_dereference(local, sta->ptk[i]); 1180 if (!key) 1181 continue; 1182 ieee80211_key_replace(key->sdata, NULL, key->sta, 1183 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 1184 key, NULL); 1185 __ieee80211_key_destroy(key, key->sdata->vif.type == 1186 NL80211_IFTYPE_STATION); 1187 } 1188 1189 mutex_unlock(&local->key_mtx); 1190 } 1191 1192 void ieee80211_delayed_tailroom_dec(struct work_struct *wk) 1193 { 1194 struct ieee80211_sub_if_data *sdata; 1195 1196 sdata = container_of(wk, struct ieee80211_sub_if_data, 1197 dec_tailroom_needed_wk.work); 1198 1199 /* 1200 * The reason for the delayed tailroom needed decrementing is to 1201 * make roaming faster: during roaming, all keys are first deleted 1202 * and then new keys are installed. The first new key causes the 1203 * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes 1204 * the cost of synchronize_net() (which can be slow). Avoid this 1205 * by deferring the crypto_tx_tailroom_needed_cnt decrementing on 1206 * key removal for a while, so if we roam the value is larger than 1207 * zero and no 0->1 transition happens. 1208 * 1209 * The cost is that if the AP switching was from an AP with keys 1210 * to one without, we still allocate tailroom while it would no 1211 * longer be needed. However, in the typical (fast) roaming case 1212 * within an ESS this usually won't happen. 1213 */ 1214 1215 mutex_lock(&sdata->local->key_mtx); 1216 decrease_tailroom_need_count(sdata, 1217 sdata->crypto_tx_tailroom_pending_dec); 1218 sdata->crypto_tx_tailroom_pending_dec = 0; 1219 mutex_unlock(&sdata->local->key_mtx); 1220 } 1221 1222 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid, 1223 const u8 *replay_ctr, gfp_t gfp) 1224 { 1225 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1226 1227 trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr); 1228 1229 cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp); 1230 } 1231 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify); 1232 1233 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf, 1234 int tid, struct ieee80211_key_seq *seq) 1235 { 1236 struct ieee80211_key *key; 1237 const u8 *pn; 1238 1239 key = container_of(keyconf, struct ieee80211_key, conf); 1240 1241 switch (key->conf.cipher) { 1242 case WLAN_CIPHER_SUITE_TKIP: 1243 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) 1244 return; 1245 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32; 1246 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16; 1247 break; 1248 case WLAN_CIPHER_SUITE_CCMP: 1249 case WLAN_CIPHER_SUITE_CCMP_256: 1250 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1251 return; 1252 if (tid < 0) 1253 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; 1254 else 1255 pn = key->u.ccmp.rx_pn[tid]; 1256 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN); 1257 break; 1258 case WLAN_CIPHER_SUITE_AES_CMAC: 1259 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1260 if (WARN_ON(tid != 0)) 1261 return; 1262 pn = key->u.aes_cmac.rx_pn; 1263 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN); 1264 break; 1265 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1266 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1267 if (WARN_ON(tid != 0)) 1268 return; 1269 pn = key->u.aes_gmac.rx_pn; 1270 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN); 1271 break; 1272 case WLAN_CIPHER_SUITE_GCMP: 1273 case WLAN_CIPHER_SUITE_GCMP_256: 1274 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1275 return; 1276 if (tid < 0) 1277 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; 1278 else 1279 pn = key->u.gcmp.rx_pn[tid]; 1280 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN); 1281 break; 1282 } 1283 } 1284 EXPORT_SYMBOL(ieee80211_get_key_rx_seq); 1285 1286 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf, 1287 int tid, struct ieee80211_key_seq *seq) 1288 { 1289 struct ieee80211_key *key; 1290 u8 *pn; 1291 1292 key = container_of(keyconf, struct ieee80211_key, conf); 1293 1294 switch (key->conf.cipher) { 1295 case WLAN_CIPHER_SUITE_TKIP: 1296 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) 1297 return; 1298 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32; 1299 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16; 1300 break; 1301 case WLAN_CIPHER_SUITE_CCMP: 1302 case WLAN_CIPHER_SUITE_CCMP_256: 1303 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1304 return; 1305 if (tid < 0) 1306 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; 1307 else 1308 pn = key->u.ccmp.rx_pn[tid]; 1309 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN); 1310 break; 1311 case WLAN_CIPHER_SUITE_AES_CMAC: 1312 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1313 if (WARN_ON(tid != 0)) 1314 return; 1315 pn = key->u.aes_cmac.rx_pn; 1316 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN); 1317 break; 1318 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1319 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1320 if (WARN_ON(tid != 0)) 1321 return; 1322 pn = key->u.aes_gmac.rx_pn; 1323 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN); 1324 break; 1325 case WLAN_CIPHER_SUITE_GCMP: 1326 case WLAN_CIPHER_SUITE_GCMP_256: 1327 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1328 return; 1329 if (tid < 0) 1330 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; 1331 else 1332 pn = key->u.gcmp.rx_pn[tid]; 1333 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN); 1334 break; 1335 default: 1336 WARN_ON(1); 1337 break; 1338 } 1339 } 1340 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq); 1341 1342 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf) 1343 { 1344 struct ieee80211_key *key; 1345 1346 key = container_of(keyconf, struct ieee80211_key, conf); 1347 1348 assert_key_lock(key->local); 1349 1350 /* 1351 * if key was uploaded, we assume the driver will/has remove(d) 1352 * it, so adjust bookkeeping accordingly 1353 */ 1354 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { 1355 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; 1356 1357 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | 1358 IEEE80211_KEY_FLAG_PUT_MIC_SPACE | 1359 IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) 1360 increment_tailroom_need_count(key->sdata); 1361 } 1362 1363 ieee80211_key_free(key, false); 1364 } 1365 EXPORT_SYMBOL_GPL(ieee80211_remove_key); 1366 1367 struct ieee80211_key_conf * 1368 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif, 1369 struct ieee80211_key_conf *keyconf) 1370 { 1371 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1372 struct ieee80211_local *local = sdata->local; 1373 struct ieee80211_key *key; 1374 int err; 1375 1376 if (WARN_ON(!local->wowlan)) 1377 return ERR_PTR(-EINVAL); 1378 1379 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 1380 return ERR_PTR(-EINVAL); 1381 1382 key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx, 1383 keyconf->keylen, keyconf->key, 1384 0, NULL); 1385 if (IS_ERR(key)) 1386 return ERR_CAST(key); 1387 1388 if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED) 1389 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT; 1390 1391 /* FIXME: this function needs to get a link ID */ 1392 err = ieee80211_key_link(key, &sdata->deflink, NULL); 1393 if (err) 1394 return ERR_PTR(err); 1395 1396 return &key->conf; 1397 } 1398 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add); 1399 1400 void ieee80211_key_mic_failure(struct ieee80211_key_conf *keyconf) 1401 { 1402 struct ieee80211_key *key; 1403 1404 key = container_of(keyconf, struct ieee80211_key, conf); 1405 1406 switch (key->conf.cipher) { 1407 case WLAN_CIPHER_SUITE_AES_CMAC: 1408 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1409 key->u.aes_cmac.icverrors++; 1410 break; 1411 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1412 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1413 key->u.aes_gmac.icverrors++; 1414 break; 1415 default: 1416 /* ignore the others for now, we don't keep counters now */ 1417 break; 1418 } 1419 } 1420 EXPORT_SYMBOL_GPL(ieee80211_key_mic_failure); 1421 1422 void ieee80211_key_replay(struct ieee80211_key_conf *keyconf) 1423 { 1424 struct ieee80211_key *key; 1425 1426 key = container_of(keyconf, struct ieee80211_key, conf); 1427 1428 switch (key->conf.cipher) { 1429 case WLAN_CIPHER_SUITE_CCMP: 1430 case WLAN_CIPHER_SUITE_CCMP_256: 1431 key->u.ccmp.replays++; 1432 break; 1433 case WLAN_CIPHER_SUITE_AES_CMAC: 1434 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1435 key->u.aes_cmac.replays++; 1436 break; 1437 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1438 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1439 key->u.aes_gmac.replays++; 1440 break; 1441 case WLAN_CIPHER_SUITE_GCMP: 1442 case WLAN_CIPHER_SUITE_GCMP_256: 1443 key->u.gcmp.replays++; 1444 break; 1445 } 1446 } 1447 EXPORT_SYMBOL_GPL(ieee80211_key_replay); 1448 1449 int ieee80211_key_switch_links(struct ieee80211_sub_if_data *sdata, 1450 unsigned long del_links_mask, 1451 unsigned long add_links_mask) 1452 { 1453 struct ieee80211_key *key; 1454 int ret; 1455 1456 list_for_each_entry(key, &sdata->key_list, list) { 1457 if (key->conf.link_id < 0 || 1458 !(del_links_mask & BIT(key->conf.link_id))) 1459 continue; 1460 1461 /* shouldn't happen for per-link keys */ 1462 WARN_ON(key->sta); 1463 1464 ieee80211_key_disable_hw_accel(key); 1465 } 1466 1467 list_for_each_entry(key, &sdata->key_list, list) { 1468 if (key->conf.link_id < 0 || 1469 !(add_links_mask & BIT(key->conf.link_id))) 1470 continue; 1471 1472 /* shouldn't happen for per-link keys */ 1473 WARN_ON(key->sta); 1474 1475 ret = ieee80211_key_enable_hw_accel(key); 1476 if (ret) 1477 return ret; 1478 } 1479 1480 return 0; 1481 } 1482