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, 2022-2025 Intel Corporation 10 */ 11 12 #include <crypto/utils.h> 13 #include <linux/if_ether.h> 14 #include <linux/etherdevice.h> 15 #include <linux/list.h> 16 #include <linux/rcupdate.h> 17 #include <linux/rtnetlink.h> 18 #include <linux/slab.h> 19 #include <linux/export.h> 20 #include <net/mac80211.h> 21 #include <linux/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 57 update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta) 58 { 59 struct ieee80211_sub_if_data *vlan; 60 61 if (sdata->vif.type != NL80211_IFTYPE_AP) 62 return; 63 64 /* crypto_tx_tailroom_needed_cnt is protected by this */ 65 lockdep_assert_wiphy(sdata->local->hw.wiphy); 66 67 rcu_read_lock(); 68 69 list_for_each_entry_rcu(vlan, &sdata->u.ap.vlans, u.vlan.list) 70 vlan->crypto_tx_tailroom_needed_cnt += delta; 71 72 rcu_read_unlock(); 73 } 74 75 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata) 76 { 77 /* 78 * When this count is zero, SKB resizing for allocating tailroom 79 * for IV or MMIC is skipped. But, this check has created two race 80 * cases in xmit path while transiting from zero count to one: 81 * 82 * 1. SKB resize was skipped because no key was added but just before 83 * the xmit key is added and SW encryption kicks off. 84 * 85 * 2. SKB resize was skipped because all the keys were hw planted but 86 * just before xmit one of the key is deleted and SW encryption kicks 87 * off. 88 * 89 * In both the above case SW encryption will find not enough space for 90 * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c) 91 * 92 * Solution has been explained at 93 * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net 94 */ 95 96 lockdep_assert_wiphy(sdata->local->hw.wiphy); 97 98 update_vlan_tailroom_need_count(sdata, 1); 99 100 if (!sdata->crypto_tx_tailroom_needed_cnt++) { 101 /* 102 * Flush all XMIT packets currently using HW encryption or no 103 * encryption at all if the count transition is from 0 -> 1. 104 */ 105 synchronize_net(); 106 } 107 } 108 109 static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata, 110 int delta) 111 { 112 lockdep_assert_wiphy(sdata->local->hw.wiphy); 113 114 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta); 115 116 update_vlan_tailroom_need_count(sdata, -delta); 117 sdata->crypto_tx_tailroom_needed_cnt -= delta; 118 } 119 120 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key) 121 { 122 struct ieee80211_sub_if_data *sdata = key->sdata; 123 struct sta_info *sta; 124 int ret = -EOPNOTSUPP; 125 126 might_sleep(); 127 lockdep_assert_wiphy(key->local->hw.wiphy); 128 129 if (key->flags & KEY_FLAG_TAINTED) { 130 /* If we get here, it's during resume and the key is 131 * tainted so shouldn't be used/programmed any more. 132 * However, its flags may still indicate that it was 133 * programmed into the device (since we're in resume) 134 * so clear that flag now to avoid trying to remove 135 * it again later. 136 */ 137 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE && 138 !(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | 139 IEEE80211_KEY_FLAG_PUT_MIC_SPACE | 140 IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) 141 increment_tailroom_need_count(sdata); 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 sta = key->sta; 151 152 /* 153 * If this is a per-STA GTK, check if it 154 * is supported; if not, return. 155 */ 156 if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) && 157 !ieee80211_hw_check(&key->local->hw, SUPPORTS_PER_STA_GTK)) 158 goto out_unsupported; 159 160 if (sta && !sta->uploaded) 161 goto out_unsupported; 162 163 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 164 /* 165 * The driver doesn't know anything about VLAN interfaces. 166 * Hence, don't send GTKs for VLAN interfaces to the driver. 167 */ 168 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) { 169 ret = 1; 170 goto out_unsupported; 171 } 172 } 173 174 if (key->conf.link_id >= 0 && sdata->vif.active_links && 175 !(sdata->vif.active_links & BIT(key->conf.link_id))) 176 return 0; 177 178 ret = drv_set_key(key->local, SET_KEY, sdata, 179 sta ? &sta->sta : NULL, &key->conf); 180 181 if (!ret) { 182 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; 183 184 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | 185 IEEE80211_KEY_FLAG_PUT_MIC_SPACE | 186 IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) 187 decrease_tailroom_need_count(sdata, 1); 188 189 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && 190 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)); 191 192 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) && 193 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)); 194 195 return 0; 196 } 197 198 if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1) 199 sdata_err(sdata, 200 "failed to set key (%d, %pM) to hardware (%d)\n", 201 key->conf.keyidx, 202 sta ? sta->sta.addr : bcast_addr, ret); 203 204 out_unsupported: 205 switch (key->conf.cipher) { 206 case WLAN_CIPHER_SUITE_WEP40: 207 case WLAN_CIPHER_SUITE_WEP104: 208 case WLAN_CIPHER_SUITE_TKIP: 209 case WLAN_CIPHER_SUITE_CCMP: 210 case WLAN_CIPHER_SUITE_CCMP_256: 211 case WLAN_CIPHER_SUITE_GCMP: 212 case WLAN_CIPHER_SUITE_GCMP_256: 213 case WLAN_CIPHER_SUITE_AES_CMAC: 214 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 215 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 216 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 217 /* all of these we can do in software - if driver can */ 218 if (ret == 1) 219 return 0; 220 if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL)) 221 return -EINVAL; 222 return 0; 223 default: 224 return -EINVAL; 225 } 226 } 227 228 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key) 229 { 230 struct ieee80211_sub_if_data *sdata; 231 struct sta_info *sta; 232 int ret; 233 234 might_sleep(); 235 236 if (!key || !key->local->ops->set_key) 237 return; 238 239 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 240 return; 241 242 sta = key->sta; 243 sdata = key->sdata; 244 245 lockdep_assert_wiphy(key->local->hw.wiphy); 246 247 if (key->conf.link_id >= 0 && sdata->vif.active_links && 248 !(sdata->vif.active_links & BIT(key->conf.link_id))) 249 return; 250 251 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | 252 IEEE80211_KEY_FLAG_PUT_MIC_SPACE | 253 IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) 254 increment_tailroom_need_count(sdata); 255 256 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; 257 ret = drv_set_key(key->local, DISABLE_KEY, sdata, 258 sta ? &sta->sta : NULL, &key->conf); 259 260 if (ret) 261 sdata_err(sdata, 262 "failed to remove key (%d, %pM) from hardware (%d)\n", 263 key->conf.keyidx, 264 sta ? sta->sta.addr : bcast_addr, ret); 265 } 266 267 static int _ieee80211_set_tx_key(struct ieee80211_key *key, bool force) 268 { 269 struct sta_info *sta = key->sta; 270 struct ieee80211_local *local = key->local; 271 272 lockdep_assert_wiphy(local->hw.wiphy); 273 274 set_sta_flag(sta, WLAN_STA_USES_ENCRYPTION); 275 276 sta->ptk_idx = key->conf.keyidx; 277 278 if (force || !ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT)) 279 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 280 ieee80211_check_fast_xmit(sta); 281 282 return 0; 283 } 284 285 int ieee80211_set_tx_key(struct ieee80211_key *key) 286 { 287 return _ieee80211_set_tx_key(key, false); 288 } 289 290 static void ieee80211_pairwise_rekey(struct ieee80211_key *old, 291 struct ieee80211_key *new) 292 { 293 struct ieee80211_local *local = new->local; 294 struct sta_info *sta = new->sta; 295 int i; 296 297 lockdep_assert_wiphy(local->hw.wiphy); 298 299 if (new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX) { 300 /* Extended Key ID key install, initial one or rekey */ 301 302 if (sta->ptk_idx != INVALID_PTK_KEYIDX && 303 !ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT)) { 304 /* Aggregation Sessions with Extended Key ID must not 305 * mix MPDUs with different keyIDs within one A-MPDU. 306 * Tear down running Tx aggregation sessions and block 307 * new Rx/Tx aggregation requests during rekey to 308 * ensure there are no A-MPDUs when the driver is not 309 * supporting A-MPDU key borders. (Blocking Tx only 310 * would be sufficient but WLAN_STA_BLOCK_BA gets the 311 * job done for the few ms we need it.) 312 */ 313 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 314 for (i = 0; i < IEEE80211_NUM_TIDS; i++) 315 __ieee80211_stop_tx_ba_session(sta, i, 316 AGG_STOP_LOCAL_REQUEST); 317 } 318 } else if (old) { 319 /* Rekey without Extended Key ID. 320 * Aggregation sessions are OK when running on SW crypto. 321 * A broken remote STA may cause issues not observed with HW 322 * crypto, though. 323 */ 324 if (!(old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 325 return; 326 327 /* Stop Tx till we are on the new key */ 328 old->flags |= KEY_FLAG_TAINTED; 329 ieee80211_clear_fast_xmit(sta); 330 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 331 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 332 ieee80211_sta_tear_down_BA_sessions(sta, 333 AGG_STOP_LOCAL_REQUEST); 334 } 335 if (!wiphy_ext_feature_isset(local->hw.wiphy, 336 NL80211_EXT_FEATURE_CAN_REPLACE_PTK0)) { 337 pr_warn_ratelimited("Rekeying PTK for STA %pM but driver can't safely do that.", 338 sta->sta.addr); 339 /* Flushing the driver queues *may* help prevent 340 * the clear text leaks and freezes. 341 */ 342 ieee80211_flush_queues(local, old->sdata, false); 343 } 344 } 345 } 346 347 static void __ieee80211_set_default_key(struct ieee80211_link_data *link, 348 int idx, bool uni, bool multi) 349 { 350 struct ieee80211_sub_if_data *sdata = link->sdata; 351 struct ieee80211_key *key = NULL; 352 353 lockdep_assert_wiphy(sdata->local->hw.wiphy); 354 355 if (idx >= 0 && idx < NUM_DEFAULT_KEYS) { 356 key = wiphy_dereference(sdata->local->hw.wiphy, 357 sdata->keys[idx]); 358 if (!key) 359 key = wiphy_dereference(sdata->local->hw.wiphy, 360 link->gtk[idx]); 361 } 362 363 if (uni) { 364 rcu_assign_pointer(sdata->default_unicast_key, key); 365 ieee80211_check_fast_xmit_iface(sdata); 366 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 367 drv_set_default_unicast_key(sdata->local, sdata, idx); 368 } 369 370 if (multi) 371 rcu_assign_pointer(link->default_multicast_key, key); 372 373 ieee80211_debugfs_key_update_default(sdata); 374 } 375 376 void ieee80211_set_default_key(struct ieee80211_link_data *link, int idx, 377 bool uni, bool multi) 378 { 379 lockdep_assert_wiphy(link->sdata->local->hw.wiphy); 380 381 __ieee80211_set_default_key(link, idx, uni, multi); 382 } 383 384 static void 385 __ieee80211_set_default_mgmt_key(struct ieee80211_link_data *link, int idx) 386 { 387 struct ieee80211_sub_if_data *sdata = link->sdata; 388 struct ieee80211_key *key = NULL; 389 390 lockdep_assert_wiphy(sdata->local->hw.wiphy); 391 392 if (idx >= NUM_DEFAULT_KEYS && 393 idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 394 key = wiphy_dereference(sdata->local->hw.wiphy, 395 link->gtk[idx]); 396 397 rcu_assign_pointer(link->default_mgmt_key, key); 398 399 ieee80211_debugfs_key_update_default(sdata); 400 } 401 402 void ieee80211_set_default_mgmt_key(struct ieee80211_link_data *link, 403 int idx) 404 { 405 lockdep_assert_wiphy(link->sdata->local->hw.wiphy); 406 407 __ieee80211_set_default_mgmt_key(link, idx); 408 } 409 410 static void 411 __ieee80211_set_default_beacon_key(struct ieee80211_link_data *link, int idx) 412 { 413 struct ieee80211_sub_if_data *sdata = link->sdata; 414 struct ieee80211_key *key = NULL; 415 416 lockdep_assert_wiphy(sdata->local->hw.wiphy); 417 418 if (idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS && 419 idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS + 420 NUM_DEFAULT_BEACON_KEYS) 421 key = wiphy_dereference(sdata->local->hw.wiphy, 422 link->gtk[idx]); 423 424 rcu_assign_pointer(link->default_beacon_key, key); 425 426 ieee80211_debugfs_key_update_default(sdata); 427 } 428 429 void ieee80211_set_default_beacon_key(struct ieee80211_link_data *link, 430 int idx) 431 { 432 lockdep_assert_wiphy(link->sdata->local->hw.wiphy); 433 434 __ieee80211_set_default_beacon_key(link, idx); 435 } 436 437 static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, 438 struct ieee80211_link_data *link, 439 struct sta_info *sta, 440 bool pairwise, 441 struct ieee80211_key *old, 442 struct ieee80211_key *new) 443 { 444 struct link_sta_info *link_sta = sta ? &sta->deflink : NULL; 445 int link_id; 446 int idx; 447 int ret = 0; 448 bool defunikey, defmultikey, defmgmtkey, defbeaconkey; 449 bool is_wep; 450 451 lockdep_assert_wiphy(sdata->local->hw.wiphy); 452 453 /* caller must provide at least one old/new */ 454 if (WARN_ON(!new && !old)) 455 return 0; 456 457 if (new) { 458 idx = new->conf.keyidx; 459 is_wep = new->conf.cipher == WLAN_CIPHER_SUITE_WEP40 || 460 new->conf.cipher == WLAN_CIPHER_SUITE_WEP104; 461 link_id = new->conf.link_id; 462 } else { 463 idx = old->conf.keyidx; 464 is_wep = old->conf.cipher == WLAN_CIPHER_SUITE_WEP40 || 465 old->conf.cipher == WLAN_CIPHER_SUITE_WEP104; 466 link_id = old->conf.link_id; 467 } 468 469 if (WARN(old && old->conf.link_id != link_id, 470 "old link ID %d doesn't match new link ID %d\n", 471 old->conf.link_id, link_id)) 472 return -EINVAL; 473 474 if (link_id >= 0) { 475 if (!link) { 476 link = sdata_dereference(sdata->link[link_id], sdata); 477 if (!link) 478 return -ENOLINK; 479 } 480 481 if (sta) { 482 link_sta = rcu_dereference_protected(sta->link[link_id], 483 lockdep_is_held(&sta->local->hw.wiphy->mtx)); 484 if (!link_sta) 485 return -ENOLINK; 486 } 487 } else { 488 link = &sdata->deflink; 489 } 490 491 if ((is_wep || pairwise) && idx >= NUM_DEFAULT_KEYS) 492 return -EINVAL; 493 494 WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx); 495 496 if (new && sta && pairwise) { 497 /* Unicast rekey needs special handling. With Extended Key ID 498 * old is still NULL for the first rekey. 499 */ 500 ieee80211_pairwise_rekey(old, new); 501 } 502 503 if (old) { 504 if (old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { 505 ieee80211_key_disable_hw_accel(old); 506 507 if (new) 508 ret = ieee80211_key_enable_hw_accel(new); 509 } 510 } else { 511 if (!new->local->wowlan) 512 ret = ieee80211_key_enable_hw_accel(new); 513 else if (link_id < 0 || !sdata->vif.active_links || 514 BIT(link_id) & sdata->vif.active_links) 515 new->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; 516 } 517 518 if (ret) 519 return ret; 520 521 if (new) 522 list_add_tail_rcu(&new->list, &sdata->key_list); 523 524 if (sta) { 525 if (pairwise) { 526 rcu_assign_pointer(sta->ptk[idx], new); 527 if (new && 528 !(new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX)) 529 _ieee80211_set_tx_key(new, true); 530 } else { 531 rcu_assign_pointer(link_sta->gtk[idx], new); 532 } 533 /* Only needed for transition from no key -> key. 534 * Still triggers unnecessary when using Extended Key ID 535 * and installing the second key ID the first time. 536 */ 537 if (new && !old) 538 ieee80211_check_fast_rx(sta); 539 } else { 540 defunikey = old && 541 old == wiphy_dereference(sdata->local->hw.wiphy, 542 sdata->default_unicast_key); 543 defmultikey = old && 544 old == wiphy_dereference(sdata->local->hw.wiphy, 545 link->default_multicast_key); 546 defmgmtkey = old && 547 old == wiphy_dereference(sdata->local->hw.wiphy, 548 link->default_mgmt_key); 549 defbeaconkey = old && 550 old == wiphy_dereference(sdata->local->hw.wiphy, 551 link->default_beacon_key); 552 553 if (defunikey && !new) 554 __ieee80211_set_default_key(link, -1, true, false); 555 if (defmultikey && !new) 556 __ieee80211_set_default_key(link, -1, false, true); 557 if (defmgmtkey && !new) 558 __ieee80211_set_default_mgmt_key(link, -1); 559 if (defbeaconkey && !new) 560 __ieee80211_set_default_beacon_key(link, -1); 561 562 if (is_wep || pairwise) 563 rcu_assign_pointer(sdata->keys[idx], new); 564 else 565 rcu_assign_pointer(link->gtk[idx], new); 566 567 if (defunikey && new) 568 __ieee80211_set_default_key(link, new->conf.keyidx, 569 true, false); 570 if (defmultikey && new) 571 __ieee80211_set_default_key(link, new->conf.keyidx, 572 false, true); 573 if (defmgmtkey && new) 574 __ieee80211_set_default_mgmt_key(link, 575 new->conf.keyidx); 576 if (defbeaconkey && new) 577 __ieee80211_set_default_beacon_key(link, 578 new->conf.keyidx); 579 } 580 581 if (old) 582 list_del_rcu(&old->list); 583 584 return 0; 585 } 586 587 struct ieee80211_key * 588 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, 589 const u8 *key_data, 590 size_t seq_len, const u8 *seq) 591 { 592 struct ieee80211_key *key; 593 int i, j, err; 594 595 if (WARN_ON(idx < 0 || 596 idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS + 597 NUM_DEFAULT_BEACON_KEYS)) 598 return ERR_PTR(-EINVAL); 599 600 key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); 601 if (!key) 602 return ERR_PTR(-ENOMEM); 603 604 /* 605 * Default to software encryption; we'll later upload the 606 * key to the hardware if possible. 607 */ 608 key->conf.flags = 0; 609 key->flags = 0; 610 611 key->conf.link_id = -1; 612 key->conf.cipher = cipher; 613 key->conf.keyidx = idx; 614 key->conf.keylen = key_len; 615 switch (cipher) { 616 case WLAN_CIPHER_SUITE_WEP40: 617 case WLAN_CIPHER_SUITE_WEP104: 618 key->conf.iv_len = IEEE80211_WEP_IV_LEN; 619 key->conf.icv_len = IEEE80211_WEP_ICV_LEN; 620 break; 621 case WLAN_CIPHER_SUITE_TKIP: 622 key->conf.iv_len = IEEE80211_TKIP_IV_LEN; 623 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN; 624 if (seq) { 625 for (i = 0; i < IEEE80211_NUM_TIDS; i++) { 626 key->u.tkip.rx[i].iv32 = 627 get_unaligned_le32(&seq[2]); 628 key->u.tkip.rx[i].iv16 = 629 get_unaligned_le16(seq); 630 } 631 } 632 spin_lock_init(&key->u.tkip.txlock); 633 break; 634 case WLAN_CIPHER_SUITE_CCMP: 635 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN; 636 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN; 637 if (seq) { 638 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) 639 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++) 640 key->u.ccmp.rx_pn[i][j] = 641 seq[IEEE80211_CCMP_PN_LEN - j - 1]; 642 } 643 /* 644 * Initialize AES key state here as an optimization so that 645 * it does not need to be initialized for every packet. 646 */ 647 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt( 648 key_data, key_len, IEEE80211_CCMP_MIC_LEN); 649 if (IS_ERR(key->u.ccmp.tfm)) { 650 err = PTR_ERR(key->u.ccmp.tfm); 651 kfree(key); 652 return ERR_PTR(err); 653 } 654 break; 655 case WLAN_CIPHER_SUITE_CCMP_256: 656 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN; 657 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN; 658 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++) 659 for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++) 660 key->u.ccmp.rx_pn[i][j] = 661 seq[IEEE80211_CCMP_256_PN_LEN - j - 1]; 662 /* Initialize AES key state here as an optimization so that 663 * it does not need to be initialized for every packet. 664 */ 665 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt( 666 key_data, key_len, IEEE80211_CCMP_256_MIC_LEN); 667 if (IS_ERR(key->u.ccmp.tfm)) { 668 err = PTR_ERR(key->u.ccmp.tfm); 669 kfree(key); 670 return ERR_PTR(err); 671 } 672 break; 673 case WLAN_CIPHER_SUITE_AES_CMAC: 674 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 675 key->conf.iv_len = 0; 676 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC) 677 key->conf.icv_len = sizeof(struct ieee80211_mmie); 678 else 679 key->conf.icv_len = sizeof(struct ieee80211_mmie_16); 680 if (seq) 681 for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++) 682 key->u.aes_cmac.rx_pn[j] = 683 seq[IEEE80211_CMAC_PN_LEN - j - 1]; 684 /* 685 * Initialize AES key state here as an optimization so that 686 * it does not need to be initialized for every packet. 687 */ 688 key->u.aes_cmac.tfm = 689 ieee80211_aes_cmac_key_setup(key_data, key_len); 690 if (IS_ERR(key->u.aes_cmac.tfm)) { 691 err = PTR_ERR(key->u.aes_cmac.tfm); 692 kfree(key); 693 return ERR_PTR(err); 694 } 695 break; 696 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 697 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 698 key->conf.iv_len = 0; 699 key->conf.icv_len = sizeof(struct ieee80211_mmie_16); 700 if (seq) 701 for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++) 702 key->u.aes_gmac.rx_pn[j] = 703 seq[IEEE80211_GMAC_PN_LEN - j - 1]; 704 /* Initialize AES key state here as an optimization so that 705 * it does not need to be initialized for every packet. 706 */ 707 key->u.aes_gmac.tfm = 708 ieee80211_aes_gmac_key_setup(key_data, key_len); 709 if (IS_ERR(key->u.aes_gmac.tfm)) { 710 err = PTR_ERR(key->u.aes_gmac.tfm); 711 kfree(key); 712 return ERR_PTR(err); 713 } 714 break; 715 case WLAN_CIPHER_SUITE_GCMP: 716 case WLAN_CIPHER_SUITE_GCMP_256: 717 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN; 718 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN; 719 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++) 720 for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++) 721 key->u.gcmp.rx_pn[i][j] = 722 seq[IEEE80211_GCMP_PN_LEN - j - 1]; 723 /* Initialize AES key state here as an optimization so that 724 * it does not need to be initialized for every packet. 725 */ 726 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data, 727 key_len); 728 if (IS_ERR(key->u.gcmp.tfm)) { 729 err = PTR_ERR(key->u.gcmp.tfm); 730 kfree(key); 731 return ERR_PTR(err); 732 } 733 break; 734 } 735 memcpy(key->conf.key, key_data, key_len); 736 INIT_LIST_HEAD(&key->list); 737 738 return key; 739 } 740 741 static void ieee80211_key_free_common(struct ieee80211_key *key) 742 { 743 switch (key->conf.cipher) { 744 case WLAN_CIPHER_SUITE_CCMP: 745 case WLAN_CIPHER_SUITE_CCMP_256: 746 ieee80211_aes_key_free(key->u.ccmp.tfm); 747 break; 748 case WLAN_CIPHER_SUITE_AES_CMAC: 749 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 750 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); 751 break; 752 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 753 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 754 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm); 755 break; 756 case WLAN_CIPHER_SUITE_GCMP: 757 case WLAN_CIPHER_SUITE_GCMP_256: 758 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm); 759 break; 760 } 761 kfree_sensitive(key); 762 } 763 764 static void __ieee80211_key_destroy(struct ieee80211_key *key, 765 bool delay_tailroom) 766 { 767 if (key->local) { 768 struct ieee80211_sub_if_data *sdata = key->sdata; 769 770 ieee80211_debugfs_key_remove(key); 771 772 if (delay_tailroom) { 773 /* see ieee80211_delayed_tailroom_dec */ 774 sdata->crypto_tx_tailroom_pending_dec++; 775 wiphy_delayed_work_queue(sdata->local->hw.wiphy, 776 &sdata->dec_tailroom_needed_wk, 777 HZ / 2); 778 } else { 779 decrease_tailroom_need_count(sdata, 1); 780 } 781 } 782 783 ieee80211_key_free_common(key); 784 } 785 786 static void ieee80211_key_destroy(struct ieee80211_key *key, 787 bool delay_tailroom) 788 { 789 if (!key) 790 return; 791 792 /* 793 * Synchronize so the TX path and rcu key iterators 794 * can no longer be using this key before we free/remove it. 795 */ 796 synchronize_net(); 797 798 __ieee80211_key_destroy(key, delay_tailroom); 799 } 800 801 void ieee80211_key_free_unused(struct ieee80211_key *key) 802 { 803 if (!key) 804 return; 805 806 WARN_ON(key->sdata || key->local); 807 ieee80211_key_free_common(key); 808 } 809 810 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata, 811 struct ieee80211_key *old, 812 struct ieee80211_key *new) 813 { 814 u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP]; 815 u8 *tk_old, *tk_new; 816 817 if (!old || new->conf.keylen != old->conf.keylen) 818 return false; 819 820 tk_old = old->conf.key; 821 tk_new = new->conf.key; 822 823 /* 824 * In station mode, don't compare the TX MIC key, as it's never used 825 * and offloaded rekeying may not care to send it to the host. This 826 * is the case in iwlwifi, for example. 827 */ 828 if (sdata->vif.type == NL80211_IFTYPE_STATION && 829 new->conf.cipher == WLAN_CIPHER_SUITE_TKIP && 830 new->conf.keylen == WLAN_KEY_LEN_TKIP && 831 !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) { 832 memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP); 833 memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP); 834 memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8); 835 memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8); 836 tk_old = tkip_old; 837 tk_new = tkip_new; 838 } 839 840 return !crypto_memneq(tk_old, tk_new, new->conf.keylen); 841 } 842 843 int ieee80211_key_link(struct ieee80211_key *key, 844 struct ieee80211_link_data *link, 845 struct sta_info *sta) 846 { 847 struct ieee80211_sub_if_data *sdata = link->sdata; 848 static atomic_t key_color = ATOMIC_INIT(0); 849 struct ieee80211_key *old_key = NULL; 850 int idx = key->conf.keyidx; 851 bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE; 852 /* 853 * We want to delay tailroom updates only for station - in that 854 * case it helps roaming speed, but in other cases it hurts and 855 * can cause warnings to appear. 856 */ 857 bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION; 858 int ret; 859 860 lockdep_assert_wiphy(sdata->local->hw.wiphy); 861 862 if (sta && pairwise) { 863 struct ieee80211_key *alt_key; 864 865 old_key = wiphy_dereference(sdata->local->hw.wiphy, 866 sta->ptk[idx]); 867 alt_key = wiphy_dereference(sdata->local->hw.wiphy, 868 sta->ptk[idx ^ 1]); 869 870 /* The rekey code assumes that the old and new key are using 871 * the same cipher. Enforce the assumption for pairwise keys. 872 */ 873 if ((alt_key && alt_key->conf.cipher != key->conf.cipher) || 874 (old_key && old_key->conf.cipher != key->conf.cipher)) { 875 ret = -EOPNOTSUPP; 876 goto out; 877 } 878 } else if (sta) { 879 struct link_sta_info *link_sta = &sta->deflink; 880 int link_id = key->conf.link_id; 881 882 if (link_id >= 0) { 883 link_sta = rcu_dereference_protected(sta->link[link_id], 884 lockdep_is_held(&sta->local->hw.wiphy->mtx)); 885 if (!link_sta) { 886 ret = -ENOLINK; 887 goto out; 888 } 889 } 890 891 old_key = wiphy_dereference(sdata->local->hw.wiphy, 892 link_sta->gtk[idx]); 893 } else { 894 if (idx < NUM_DEFAULT_KEYS) 895 old_key = wiphy_dereference(sdata->local->hw.wiphy, 896 sdata->keys[idx]); 897 if (!old_key) 898 old_key = wiphy_dereference(sdata->local->hw.wiphy, 899 link->gtk[idx]); 900 } 901 902 /* Non-pairwise keys must also not switch the cipher on rekey */ 903 if (!pairwise) { 904 if (old_key && old_key->conf.cipher != key->conf.cipher) { 905 ret = -EOPNOTSUPP; 906 goto out; 907 } 908 } 909 910 /* 911 * Silently accept key re-installation without really installing the 912 * new version of the key to avoid nonce reuse or replay issues. 913 */ 914 if (ieee80211_key_identical(sdata, old_key, key)) { 915 ret = -EALREADY; 916 goto out; 917 } 918 919 key->local = sdata->local; 920 key->sdata = sdata; 921 key->sta = sta; 922 923 /* 924 * Assign a unique ID to every key so we can easily prevent mixed 925 * key and fragment cache attacks. 926 */ 927 key->color = atomic_inc_return(&key_color); 928 929 /* keep this flag for easier access later */ 930 if (sta && sta->sta.spp_amsdu) 931 key->conf.flags |= IEEE80211_KEY_FLAG_SPP_AMSDU; 932 933 increment_tailroom_need_count(sdata); 934 935 ret = ieee80211_key_replace(sdata, link, sta, pairwise, old_key, key); 936 937 if (!ret) { 938 ieee80211_debugfs_key_add(key); 939 ieee80211_key_destroy(old_key, delay_tailroom); 940 } else { 941 ieee80211_key_free(key, delay_tailroom); 942 } 943 944 key = NULL; 945 946 out: 947 ieee80211_key_free_unused(key); 948 return ret; 949 } 950 951 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom) 952 { 953 if (!key) 954 return; 955 956 /* 957 * Replace key with nothingness if it was ever used. 958 */ 959 if (key->sdata) 960 ieee80211_key_replace(key->sdata, NULL, key->sta, 961 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 962 key, NULL); 963 ieee80211_key_destroy(key, delay_tailroom); 964 } 965 966 void ieee80211_reenable_keys(struct ieee80211_sub_if_data *sdata) 967 { 968 struct ieee80211_key *key; 969 struct ieee80211_sub_if_data *vlan; 970 971 lockdep_assert_wiphy(sdata->local->hw.wiphy); 972 973 sdata->crypto_tx_tailroom_needed_cnt = 0; 974 sdata->crypto_tx_tailroom_pending_dec = 0; 975 976 if (sdata->vif.type == NL80211_IFTYPE_AP) { 977 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) { 978 vlan->crypto_tx_tailroom_needed_cnt = 0; 979 vlan->crypto_tx_tailroom_pending_dec = 0; 980 } 981 } 982 983 if (ieee80211_sdata_running(sdata)) { 984 list_for_each_entry(key, &sdata->key_list, list) { 985 increment_tailroom_need_count(sdata); 986 ieee80211_key_enable_hw_accel(key); 987 } 988 } 989 } 990 991 static void 992 ieee80211_key_iter(struct ieee80211_hw *hw, 993 struct ieee80211_vif *vif, 994 struct ieee80211_key *key, 995 void (*iter)(struct ieee80211_hw *hw, 996 struct ieee80211_vif *vif, 997 struct ieee80211_sta *sta, 998 struct ieee80211_key_conf *key, 999 void *data), 1000 void *iter_data) 1001 { 1002 /* skip keys of station in removal process */ 1003 if (key->sta && key->sta->removed) 1004 return; 1005 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 1006 return; 1007 iter(hw, vif, key->sta ? &key->sta->sta : NULL, 1008 &key->conf, iter_data); 1009 } 1010 1011 void ieee80211_iter_keys(struct ieee80211_hw *hw, 1012 struct ieee80211_vif *vif, 1013 void (*iter)(struct ieee80211_hw *hw, 1014 struct ieee80211_vif *vif, 1015 struct ieee80211_sta *sta, 1016 struct ieee80211_key_conf *key, 1017 void *data), 1018 void *iter_data) 1019 { 1020 struct ieee80211_local *local = hw_to_local(hw); 1021 struct ieee80211_key *key, *tmp; 1022 struct ieee80211_sub_if_data *sdata; 1023 1024 lockdep_assert_wiphy(hw->wiphy); 1025 1026 if (vif) { 1027 sdata = vif_to_sdata(vif); 1028 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) 1029 ieee80211_key_iter(hw, vif, key, iter, iter_data); 1030 } else { 1031 list_for_each_entry(sdata, &local->interfaces, list) 1032 list_for_each_entry_safe(key, tmp, 1033 &sdata->key_list, list) 1034 ieee80211_key_iter(hw, &sdata->vif, key, 1035 iter, iter_data); 1036 } 1037 } 1038 EXPORT_SYMBOL(ieee80211_iter_keys); 1039 1040 static void 1041 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw, 1042 struct ieee80211_sub_if_data *sdata, 1043 void (*iter)(struct ieee80211_hw *hw, 1044 struct ieee80211_vif *vif, 1045 struct ieee80211_sta *sta, 1046 struct ieee80211_key_conf *key, 1047 void *data), 1048 void *iter_data) 1049 { 1050 struct ieee80211_key *key; 1051 1052 list_for_each_entry_rcu(key, &sdata->key_list, list) 1053 ieee80211_key_iter(hw, &sdata->vif, key, iter, iter_data); 1054 } 1055 1056 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw, 1057 struct ieee80211_vif *vif, 1058 void (*iter)(struct ieee80211_hw *hw, 1059 struct ieee80211_vif *vif, 1060 struct ieee80211_sta *sta, 1061 struct ieee80211_key_conf *key, 1062 void *data), 1063 void *iter_data) 1064 { 1065 struct ieee80211_local *local = hw_to_local(hw); 1066 struct ieee80211_sub_if_data *sdata; 1067 1068 if (vif) { 1069 sdata = vif_to_sdata(vif); 1070 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data); 1071 } else { 1072 list_for_each_entry_rcu(sdata, &local->interfaces, list) 1073 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data); 1074 } 1075 } 1076 EXPORT_SYMBOL(ieee80211_iter_keys_rcu); 1077 1078 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata, 1079 struct list_head *keys) 1080 { 1081 struct ieee80211_key *key, *tmp; 1082 1083 decrease_tailroom_need_count(sdata, 1084 sdata->crypto_tx_tailroom_pending_dec); 1085 sdata->crypto_tx_tailroom_pending_dec = 0; 1086 1087 ieee80211_debugfs_key_remove_mgmt_default(sdata); 1088 ieee80211_debugfs_key_remove_beacon_default(sdata); 1089 1090 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) { 1091 ieee80211_key_replace(key->sdata, NULL, key->sta, 1092 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 1093 key, NULL); 1094 list_add_tail(&key->list, keys); 1095 } 1096 1097 ieee80211_debugfs_key_update_default(sdata); 1098 } 1099 1100 void ieee80211_remove_link_keys(struct ieee80211_link_data *link, 1101 struct list_head *keys) 1102 { 1103 struct ieee80211_sub_if_data *sdata = link->sdata; 1104 struct ieee80211_local *local = sdata->local; 1105 struct ieee80211_key *key, *tmp; 1106 1107 lockdep_assert_wiphy(local->hw.wiphy); 1108 1109 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) { 1110 if (key->conf.link_id != link->link_id) 1111 continue; 1112 ieee80211_key_replace(key->sdata, link, key->sta, 1113 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 1114 key, NULL); 1115 list_add_tail(&key->list, keys); 1116 } 1117 } 1118 1119 void ieee80211_free_key_list(struct ieee80211_local *local, 1120 struct list_head *keys) 1121 { 1122 struct ieee80211_key *key, *tmp; 1123 1124 lockdep_assert_wiphy(local->hw.wiphy); 1125 1126 list_for_each_entry_safe(key, tmp, keys, list) 1127 __ieee80211_key_destroy(key, false); 1128 } 1129 1130 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata, 1131 bool force_synchronize) 1132 { 1133 struct ieee80211_local *local = sdata->local; 1134 struct ieee80211_sub_if_data *vlan; 1135 struct ieee80211_sub_if_data *master; 1136 struct ieee80211_key *key, *tmp; 1137 LIST_HEAD(keys); 1138 1139 wiphy_delayed_work_cancel(local->hw.wiphy, 1140 &sdata->dec_tailroom_needed_wk); 1141 1142 lockdep_assert_wiphy(local->hw.wiphy); 1143 1144 ieee80211_free_keys_iface(sdata, &keys); 1145 1146 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1147 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 1148 ieee80211_free_keys_iface(vlan, &keys); 1149 } 1150 1151 if (!list_empty(&keys) || force_synchronize) 1152 synchronize_net(); 1153 list_for_each_entry_safe(key, tmp, &keys, list) 1154 __ieee80211_key_destroy(key, false); 1155 1156 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1157 if (sdata->bss) { 1158 master = container_of(sdata->bss, 1159 struct ieee80211_sub_if_data, 1160 u.ap); 1161 1162 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt != 1163 master->crypto_tx_tailroom_needed_cnt); 1164 } 1165 } else { 1166 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || 1167 sdata->crypto_tx_tailroom_pending_dec); 1168 } 1169 1170 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1171 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 1172 WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt || 1173 vlan->crypto_tx_tailroom_pending_dec); 1174 } 1175 } 1176 1177 void ieee80211_free_sta_keys(struct ieee80211_local *local, 1178 struct sta_info *sta) 1179 { 1180 struct ieee80211_key *key; 1181 int i; 1182 1183 lockdep_assert_wiphy(local->hw.wiphy); 1184 1185 for (i = 0; i < ARRAY_SIZE(sta->deflink.gtk); i++) { 1186 key = wiphy_dereference(local->hw.wiphy, sta->deflink.gtk[i]); 1187 if (!key) 1188 continue; 1189 ieee80211_key_replace(key->sdata, NULL, key->sta, 1190 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 1191 key, NULL); 1192 __ieee80211_key_destroy(key, key->sdata->vif.type == 1193 NL80211_IFTYPE_STATION); 1194 } 1195 1196 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 1197 key = wiphy_dereference(local->hw.wiphy, sta->ptk[i]); 1198 if (!key) 1199 continue; 1200 ieee80211_key_replace(key->sdata, NULL, key->sta, 1201 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 1202 key, NULL); 1203 __ieee80211_key_destroy(key, key->sdata->vif.type == 1204 NL80211_IFTYPE_STATION); 1205 } 1206 } 1207 1208 void ieee80211_delayed_tailroom_dec(struct wiphy *wiphy, 1209 struct wiphy_work *wk) 1210 { 1211 struct ieee80211_sub_if_data *sdata; 1212 1213 sdata = container_of(wk, struct ieee80211_sub_if_data, 1214 dec_tailroom_needed_wk.work); 1215 1216 /* 1217 * The reason for the delayed tailroom needed decrementing is to 1218 * make roaming faster: during roaming, all keys are first deleted 1219 * and then new keys are installed. The first new key causes the 1220 * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes 1221 * the cost of synchronize_net() (which can be slow). Avoid this 1222 * by deferring the crypto_tx_tailroom_needed_cnt decrementing on 1223 * key removal for a while, so if we roam the value is larger than 1224 * zero and no 0->1 transition happens. 1225 * 1226 * The cost is that if the AP switching was from an AP with keys 1227 * to one without, we still allocate tailroom while it would no 1228 * longer be needed. However, in the typical (fast) roaming case 1229 * within an ESS this usually won't happen. 1230 */ 1231 1232 decrease_tailroom_need_count(sdata, 1233 sdata->crypto_tx_tailroom_pending_dec); 1234 sdata->crypto_tx_tailroom_pending_dec = 0; 1235 } 1236 1237 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid, 1238 const u8 *replay_ctr, gfp_t gfp) 1239 { 1240 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1241 1242 trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr); 1243 1244 cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp); 1245 } 1246 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify); 1247 1248 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf, 1249 int tid, struct ieee80211_key_seq *seq) 1250 { 1251 struct ieee80211_key *key; 1252 const u8 *pn; 1253 1254 key = container_of(keyconf, struct ieee80211_key, conf); 1255 1256 switch (key->conf.cipher) { 1257 case WLAN_CIPHER_SUITE_TKIP: 1258 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) 1259 return; 1260 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32; 1261 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16; 1262 break; 1263 case WLAN_CIPHER_SUITE_CCMP: 1264 case WLAN_CIPHER_SUITE_CCMP_256: 1265 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1266 return; 1267 if (tid < 0) 1268 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; 1269 else 1270 pn = key->u.ccmp.rx_pn[tid]; 1271 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN); 1272 break; 1273 case WLAN_CIPHER_SUITE_AES_CMAC: 1274 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1275 if (WARN_ON(tid != 0)) 1276 return; 1277 pn = key->u.aes_cmac.rx_pn; 1278 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN); 1279 break; 1280 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1281 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1282 if (WARN_ON(tid != 0)) 1283 return; 1284 pn = key->u.aes_gmac.rx_pn; 1285 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN); 1286 break; 1287 case WLAN_CIPHER_SUITE_GCMP: 1288 case WLAN_CIPHER_SUITE_GCMP_256: 1289 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1290 return; 1291 if (tid < 0) 1292 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; 1293 else 1294 pn = key->u.gcmp.rx_pn[tid]; 1295 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN); 1296 break; 1297 } 1298 } 1299 EXPORT_SYMBOL(ieee80211_get_key_rx_seq); 1300 1301 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf, 1302 int tid, struct ieee80211_key_seq *seq) 1303 { 1304 struct ieee80211_key *key; 1305 u8 *pn; 1306 1307 key = container_of(keyconf, struct ieee80211_key, conf); 1308 1309 switch (key->conf.cipher) { 1310 case WLAN_CIPHER_SUITE_TKIP: 1311 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) 1312 return; 1313 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32; 1314 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16; 1315 break; 1316 case WLAN_CIPHER_SUITE_CCMP: 1317 case WLAN_CIPHER_SUITE_CCMP_256: 1318 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1319 return; 1320 if (tid < 0) 1321 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; 1322 else 1323 pn = key->u.ccmp.rx_pn[tid]; 1324 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN); 1325 break; 1326 case WLAN_CIPHER_SUITE_AES_CMAC: 1327 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1328 if (WARN_ON(tid != 0)) 1329 return; 1330 pn = key->u.aes_cmac.rx_pn; 1331 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN); 1332 break; 1333 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1334 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1335 if (WARN_ON(tid != 0)) 1336 return; 1337 pn = key->u.aes_gmac.rx_pn; 1338 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN); 1339 break; 1340 case WLAN_CIPHER_SUITE_GCMP: 1341 case WLAN_CIPHER_SUITE_GCMP_256: 1342 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1343 return; 1344 if (tid < 0) 1345 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; 1346 else 1347 pn = key->u.gcmp.rx_pn[tid]; 1348 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN); 1349 break; 1350 default: 1351 WARN_ON(1); 1352 break; 1353 } 1354 } 1355 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq); 1356 1357 struct ieee80211_key_conf * 1358 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif, 1359 u8 idx, u8 *key_data, u8 key_len, 1360 int link_id) 1361 { 1362 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1363 struct ieee80211_local *local = sdata->local; 1364 struct ieee80211_key *prev_key; 1365 struct ieee80211_key *key; 1366 int err; 1367 struct ieee80211_link_data *link_data = 1368 link_id < 0 ? &sdata->deflink : 1369 sdata_dereference(sdata->link[link_id], sdata); 1370 1371 if (WARN_ON(!link_data)) 1372 return ERR_PTR(-EINVAL); 1373 1374 if (WARN_ON(!local->wowlan)) 1375 return ERR_PTR(-EINVAL); 1376 1377 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 1378 return ERR_PTR(-EINVAL); 1379 1380 if (WARN_ON(idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS + 1381 NUM_DEFAULT_BEACON_KEYS)) 1382 return ERR_PTR(-EINVAL); 1383 1384 prev_key = wiphy_dereference(local->hw.wiphy, 1385 link_data->gtk[idx]); 1386 if (!prev_key) { 1387 if (idx < NUM_DEFAULT_KEYS) { 1388 for (int i = 0; i < NUM_DEFAULT_KEYS; i++) { 1389 if (i == idx) 1390 continue; 1391 prev_key = wiphy_dereference(local->hw.wiphy, 1392 link_data->gtk[i]); 1393 if (prev_key) 1394 break; 1395 } 1396 } else { 1397 /* For IGTK we have 4 and 5 and for BIGTK - 6 and 7 */ 1398 prev_key = wiphy_dereference(local->hw.wiphy, 1399 link_data->gtk[idx ^ 1]); 1400 } 1401 } 1402 1403 if (WARN_ON(!prev_key)) 1404 return ERR_PTR(-EINVAL); 1405 1406 if (WARN_ON(key_len < prev_key->conf.keylen)) 1407 return ERR_PTR(-EINVAL); 1408 1409 key = ieee80211_key_alloc(prev_key->conf.cipher, idx, 1410 prev_key->conf.keylen, key_data, 1411 0, NULL); 1412 if (IS_ERR(key)) 1413 return ERR_CAST(key); 1414 1415 if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED) 1416 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT; 1417 1418 key->conf.link_id = link_data->link_id; 1419 1420 err = ieee80211_key_link(key, link_data, NULL); 1421 if (err) 1422 return ERR_PTR(err); 1423 1424 return &key->conf; 1425 } 1426 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add); 1427 1428 void ieee80211_key_mic_failure(struct ieee80211_key_conf *keyconf) 1429 { 1430 struct ieee80211_key *key; 1431 1432 key = container_of(keyconf, struct ieee80211_key, conf); 1433 1434 switch (key->conf.cipher) { 1435 case WLAN_CIPHER_SUITE_AES_CMAC: 1436 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1437 key->u.aes_cmac.icverrors++; 1438 break; 1439 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1440 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1441 key->u.aes_gmac.icverrors++; 1442 break; 1443 default: 1444 /* ignore the others for now, we don't keep counters now */ 1445 break; 1446 } 1447 } 1448 EXPORT_SYMBOL_GPL(ieee80211_key_mic_failure); 1449 1450 void ieee80211_key_replay(struct ieee80211_key_conf *keyconf) 1451 { 1452 struct ieee80211_key *key; 1453 1454 key = container_of(keyconf, struct ieee80211_key, conf); 1455 1456 switch (key->conf.cipher) { 1457 case WLAN_CIPHER_SUITE_CCMP: 1458 case WLAN_CIPHER_SUITE_CCMP_256: 1459 key->u.ccmp.replays++; 1460 break; 1461 case WLAN_CIPHER_SUITE_AES_CMAC: 1462 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1463 key->u.aes_cmac.replays++; 1464 break; 1465 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1466 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1467 key->u.aes_gmac.replays++; 1468 break; 1469 case WLAN_CIPHER_SUITE_GCMP: 1470 case WLAN_CIPHER_SUITE_GCMP_256: 1471 key->u.gcmp.replays++; 1472 break; 1473 } 1474 } 1475 EXPORT_SYMBOL_GPL(ieee80211_key_replay); 1476 1477 int ieee80211_key_switch_links(struct ieee80211_sub_if_data *sdata, 1478 unsigned long del_links_mask, 1479 unsigned long add_links_mask) 1480 { 1481 struct ieee80211_key *key; 1482 int ret; 1483 1484 list_for_each_entry(key, &sdata->key_list, list) { 1485 if (key->conf.link_id < 0 || 1486 !(del_links_mask & BIT(key->conf.link_id))) 1487 continue; 1488 1489 /* shouldn't happen for per-link keys */ 1490 WARN_ON(key->sta); 1491 1492 ieee80211_key_disable_hw_accel(key); 1493 } 1494 1495 list_for_each_entry(key, &sdata->key_list, list) { 1496 if (key->conf.link_id < 0 || 1497 !(add_links_mask & BIT(key->conf.link_id))) 1498 continue; 1499 1500 /* shouldn't happen for per-link keys */ 1501 WARN_ON(key->sta); 1502 1503 ret = ieee80211_key_enable_hw_accel(key); 1504 if (ret) 1505 return ret; 1506 } 1507 1508 return 0; 1509 } 1510