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, 2022-2024 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 <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 54static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; 55 56static void 57update_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 75static 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 109static 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 120static 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 228static 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 267static 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 285int ieee80211_set_tx_key(struct ieee80211_key *key) 286{ 287 return _ieee80211_set_tx_key(key, false); 288} 289 290static 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 347static 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 376void 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 384static 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 402void 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 410static 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 429void 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 437static 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 514 new->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; 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 == wiphy_dereference(sdata->local->hw.wiphy, 541 sdata->default_unicast_key); 542 defmultikey = old && 543 old == wiphy_dereference(sdata->local->hw.wiphy, 544 link->default_multicast_key); 545 defmgmtkey = old && 546 old == wiphy_dereference(sdata->local->hw.wiphy, 547 link->default_mgmt_key); 548 defbeaconkey = old && 549 old == wiphy_dereference(sdata->local->hw.wiphy, 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 586struct ieee80211_key * 587ieee80211_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 740static 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 763static 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 wiphy_delayed_work_queue(sdata->local->hw.wiphy, 775 &sdata->dec_tailroom_needed_wk, 776 HZ / 2); 777 } else { 778 decrease_tailroom_need_count(sdata, 1); 779 } 780 } 781 782 ieee80211_key_free_common(key); 783} 784 785static void ieee80211_key_destroy(struct ieee80211_key *key, 786 bool delay_tailroom) 787{ 788 if (!key) 789 return; 790 791 /* 792 * Synchronize so the TX path and rcu key iterators 793 * can no longer be using this key before we free/remove it. 794 */ 795 synchronize_net(); 796 797 __ieee80211_key_destroy(key, delay_tailroom); 798} 799 800void ieee80211_key_free_unused(struct ieee80211_key *key) 801{ 802 if (!key) 803 return; 804 805 WARN_ON(key->sdata || key->local); 806 ieee80211_key_free_common(key); 807} 808 809static 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 842int 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; 858 859 lockdep_assert_wiphy(sdata->local->hw.wiphy); 860 861 if (sta && pairwise) { 862 struct ieee80211_key *alt_key; 863 864 old_key = wiphy_dereference(sdata->local->hw.wiphy, 865 sta->ptk[idx]); 866 alt_key = wiphy_dereference(sdata->local->hw.wiphy, 867 sta->ptk[idx ^ 1]); 868 869 /* The rekey code assumes that the old and new key are using 870 * the same cipher. Enforce the assumption for pairwise keys. 871 */ 872 if ((alt_key && alt_key->conf.cipher != key->conf.cipher) || 873 (old_key && old_key->conf.cipher != key->conf.cipher)) { 874 ret = -EOPNOTSUPP; 875 goto out; 876 } 877 } else if (sta) { 878 struct link_sta_info *link_sta = &sta->deflink; 879 int link_id = key->conf.link_id; 880 881 if (link_id >= 0) { 882 link_sta = rcu_dereference_protected(sta->link[link_id], 883 lockdep_is_held(&sta->local->hw.wiphy->mtx)); 884 if (!link_sta) { 885 ret = -ENOLINK; 886 goto out; 887 } 888 } 889 890 old_key = wiphy_dereference(sdata->local->hw.wiphy, 891 link_sta->gtk[idx]); 892 } else { 893 if (idx < NUM_DEFAULT_KEYS) 894 old_key = wiphy_dereference(sdata->local->hw.wiphy, 895 sdata->keys[idx]); 896 if (!old_key) 897 old_key = wiphy_dereference(sdata->local->hw.wiphy, 898 link->gtk[idx]); 899 } 900 901 /* Non-pairwise keys must also not switch the cipher on rekey */ 902 if (!pairwise) { 903 if (old_key && old_key->conf.cipher != key->conf.cipher) { 904 ret = -EOPNOTSUPP; 905 goto out; 906 } 907 } 908 909 /* 910 * Silently accept key re-installation without really installing the 911 * new version of the key to avoid nonce reuse or replay issues. 912 */ 913 if (ieee80211_key_identical(sdata, old_key, key)) { 914 ret = -EALREADY; 915 goto out; 916 } 917 918 key->local = sdata->local; 919 key->sdata = sdata; 920 key->sta = sta; 921 922 /* 923 * Assign a unique ID to every key so we can easily prevent mixed 924 * key and fragment cache attacks. 925 */ 926 key->color = atomic_inc_return(&key_color); 927 928 /* keep this flag for easier access later */ 929 if (sta && sta->sta.spp_amsdu) 930 key->conf.flags |= IEEE80211_KEY_FLAG_SPP_AMSDU; 931 932 increment_tailroom_need_count(sdata); 933 934 ret = ieee80211_key_replace(sdata, link, sta, pairwise, old_key, key); 935 936 if (!ret) { 937 ieee80211_debugfs_key_add(key); 938 ieee80211_key_destroy(old_key, delay_tailroom); 939 } else { 940 ieee80211_key_free(key, delay_tailroom); 941 } 942 943 key = NULL; 944 945 out: 946 ieee80211_key_free_unused(key); 947 return ret; 948} 949 950void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom) 951{ 952 if (!key) 953 return; 954 955 /* 956 * Replace key with nothingness if it was ever used. 957 */ 958 if (key->sdata) 959 ieee80211_key_replace(key->sdata, NULL, key->sta, 960 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 961 key, NULL); 962 ieee80211_key_destroy(key, delay_tailroom); 963} 964 965void ieee80211_reenable_keys(struct ieee80211_sub_if_data *sdata) 966{ 967 struct ieee80211_key *key; 968 struct ieee80211_sub_if_data *vlan; 969 970 lockdep_assert_wiphy(sdata->local->hw.wiphy); 971 972 sdata->crypto_tx_tailroom_needed_cnt = 0; 973 sdata->crypto_tx_tailroom_pending_dec = 0; 974 975 if (sdata->vif.type == NL80211_IFTYPE_AP) { 976 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) { 977 vlan->crypto_tx_tailroom_needed_cnt = 0; 978 vlan->crypto_tx_tailroom_pending_dec = 0; 979 } 980 } 981 982 if (ieee80211_sdata_running(sdata)) { 983 list_for_each_entry(key, &sdata->key_list, list) { 984 increment_tailroom_need_count(sdata); 985 ieee80211_key_enable_hw_accel(key); 986 } 987 } 988} 989 990void ieee80211_iter_keys(struct ieee80211_hw *hw, 991 struct ieee80211_vif *vif, 992 void (*iter)(struct ieee80211_hw *hw, 993 struct ieee80211_vif *vif, 994 struct ieee80211_sta *sta, 995 struct ieee80211_key_conf *key, 996 void *data), 997 void *iter_data) 998{ 999 struct ieee80211_local *local = hw_to_local(hw); 1000 struct ieee80211_key *key, *tmp; 1001 struct ieee80211_sub_if_data *sdata; 1002 1003 lockdep_assert_wiphy(hw->wiphy); 1004 1005 if (vif) { 1006 sdata = vif_to_sdata(vif); 1007 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) 1008 iter(hw, &sdata->vif, 1009 key->sta ? &key->sta->sta : NULL, 1010 &key->conf, iter_data); 1011 } else { 1012 list_for_each_entry(sdata, &local->interfaces, list) 1013 list_for_each_entry_safe(key, tmp, 1014 &sdata->key_list, list) 1015 iter(hw, &sdata->vif, 1016 key->sta ? &key->sta->sta : NULL, 1017 &key->conf, iter_data); 1018 } 1019} 1020EXPORT_SYMBOL(ieee80211_iter_keys); 1021 1022static void 1023_ieee80211_iter_keys_rcu(struct ieee80211_hw *hw, 1024 struct ieee80211_sub_if_data *sdata, 1025 void (*iter)(struct ieee80211_hw *hw, 1026 struct ieee80211_vif *vif, 1027 struct ieee80211_sta *sta, 1028 struct ieee80211_key_conf *key, 1029 void *data), 1030 void *iter_data) 1031{ 1032 struct ieee80211_key *key; 1033 1034 list_for_each_entry_rcu(key, &sdata->key_list, list) { 1035 /* skip keys of station in removal process */ 1036 if (key->sta && key->sta->removed) 1037 continue; 1038 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 1039 continue; 1040 1041 iter(hw, &sdata->vif, 1042 key->sta ? &key->sta->sta : NULL, 1043 &key->conf, iter_data); 1044 } 1045} 1046 1047void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw, 1048 struct ieee80211_vif *vif, 1049 void (*iter)(struct ieee80211_hw *hw, 1050 struct ieee80211_vif *vif, 1051 struct ieee80211_sta *sta, 1052 struct ieee80211_key_conf *key, 1053 void *data), 1054 void *iter_data) 1055{ 1056 struct ieee80211_local *local = hw_to_local(hw); 1057 struct ieee80211_sub_if_data *sdata; 1058 1059 if (vif) { 1060 sdata = vif_to_sdata(vif); 1061 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data); 1062 } else { 1063 list_for_each_entry_rcu(sdata, &local->interfaces, list) 1064 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data); 1065 } 1066} 1067EXPORT_SYMBOL(ieee80211_iter_keys_rcu); 1068 1069static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata, 1070 struct list_head *keys) 1071{ 1072 struct ieee80211_key *key, *tmp; 1073 1074 decrease_tailroom_need_count(sdata, 1075 sdata->crypto_tx_tailroom_pending_dec); 1076 sdata->crypto_tx_tailroom_pending_dec = 0; 1077 1078 ieee80211_debugfs_key_remove_mgmt_default(sdata); 1079 ieee80211_debugfs_key_remove_beacon_default(sdata); 1080 1081 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) { 1082 ieee80211_key_replace(key->sdata, NULL, key->sta, 1083 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 1084 key, NULL); 1085 list_add_tail(&key->list, keys); 1086 } 1087 1088 ieee80211_debugfs_key_update_default(sdata); 1089} 1090 1091void ieee80211_remove_link_keys(struct ieee80211_link_data *link, 1092 struct list_head *keys) 1093{ 1094 struct ieee80211_sub_if_data *sdata = link->sdata; 1095 struct ieee80211_local *local = sdata->local; 1096 struct ieee80211_key *key, *tmp; 1097 1098 lockdep_assert_wiphy(local->hw.wiphy); 1099 1100 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) { 1101 if (key->conf.link_id != link->link_id) 1102 continue; 1103 ieee80211_key_replace(key->sdata, link, key->sta, 1104 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 1105 key, NULL); 1106 list_add_tail(&key->list, keys); 1107 } 1108} 1109 1110void ieee80211_free_key_list(struct ieee80211_local *local, 1111 struct list_head *keys) 1112{ 1113 struct ieee80211_key *key, *tmp; 1114 1115 lockdep_assert_wiphy(local->hw.wiphy); 1116 1117 list_for_each_entry_safe(key, tmp, keys, list) 1118 __ieee80211_key_destroy(key, false); 1119} 1120 1121void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata, 1122 bool force_synchronize) 1123{ 1124 struct ieee80211_local *local = sdata->local; 1125 struct ieee80211_sub_if_data *vlan; 1126 struct ieee80211_sub_if_data *master; 1127 struct ieee80211_key *key, *tmp; 1128 LIST_HEAD(keys); 1129 1130 wiphy_delayed_work_cancel(local->hw.wiphy, 1131 &sdata->dec_tailroom_needed_wk); 1132 1133 lockdep_assert_wiphy(local->hw.wiphy); 1134 1135 ieee80211_free_keys_iface(sdata, &keys); 1136 1137 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1138 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 1139 ieee80211_free_keys_iface(vlan, &keys); 1140 } 1141 1142 if (!list_empty(&keys) || force_synchronize) 1143 synchronize_net(); 1144 list_for_each_entry_safe(key, tmp, &keys, list) 1145 __ieee80211_key_destroy(key, false); 1146 1147 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1148 if (sdata->bss) { 1149 master = container_of(sdata->bss, 1150 struct ieee80211_sub_if_data, 1151 u.ap); 1152 1153 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt != 1154 master->crypto_tx_tailroom_needed_cnt); 1155 } 1156 } else { 1157 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || 1158 sdata->crypto_tx_tailroom_pending_dec); 1159 } 1160 1161 if (sdata->vif.type == NL80211_IFTYPE_AP) { 1162 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 1163 WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt || 1164 vlan->crypto_tx_tailroom_pending_dec); 1165 } 1166} 1167 1168void ieee80211_free_sta_keys(struct ieee80211_local *local, 1169 struct sta_info *sta) 1170{ 1171 struct ieee80211_key *key; 1172 int i; 1173 1174 lockdep_assert_wiphy(local->hw.wiphy); 1175 1176 for (i = 0; i < ARRAY_SIZE(sta->deflink.gtk); i++) { 1177 key = wiphy_dereference(local->hw.wiphy, sta->deflink.gtk[i]); 1178 if (!key) 1179 continue; 1180 ieee80211_key_replace(key->sdata, NULL, key->sta, 1181 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 1182 key, NULL); 1183 __ieee80211_key_destroy(key, key->sdata->vif.type == 1184 NL80211_IFTYPE_STATION); 1185 } 1186 1187 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 1188 key = wiphy_dereference(local->hw.wiphy, sta->ptk[i]); 1189 if (!key) 1190 continue; 1191 ieee80211_key_replace(key->sdata, NULL, key->sta, 1192 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 1193 key, NULL); 1194 __ieee80211_key_destroy(key, key->sdata->vif.type == 1195 NL80211_IFTYPE_STATION); 1196 } 1197} 1198 1199void ieee80211_delayed_tailroom_dec(struct wiphy *wiphy, 1200 struct wiphy_work *wk) 1201{ 1202 struct ieee80211_sub_if_data *sdata; 1203 1204 sdata = container_of(wk, struct ieee80211_sub_if_data, 1205 dec_tailroom_needed_wk.work); 1206 1207 /* 1208 * The reason for the delayed tailroom needed decrementing is to 1209 * make roaming faster: during roaming, all keys are first deleted 1210 * and then new keys are installed. The first new key causes the 1211 * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes 1212 * the cost of synchronize_net() (which can be slow). Avoid this 1213 * by deferring the crypto_tx_tailroom_needed_cnt decrementing on 1214 * key removal for a while, so if we roam the value is larger than 1215 * zero and no 0->1 transition happens. 1216 * 1217 * The cost is that if the AP switching was from an AP with keys 1218 * to one without, we still allocate tailroom while it would no 1219 * longer be needed. However, in the typical (fast) roaming case 1220 * within an ESS this usually won't happen. 1221 */ 1222 1223 decrease_tailroom_need_count(sdata, 1224 sdata->crypto_tx_tailroom_pending_dec); 1225 sdata->crypto_tx_tailroom_pending_dec = 0; 1226} 1227 1228void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid, 1229 const u8 *replay_ctr, gfp_t gfp) 1230{ 1231 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1232 1233 trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr); 1234 1235 cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp); 1236} 1237EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify); 1238 1239void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf, 1240 int tid, struct ieee80211_key_seq *seq) 1241{ 1242 struct ieee80211_key *key; 1243 const u8 *pn; 1244 1245 key = container_of(keyconf, struct ieee80211_key, conf); 1246 1247 switch (key->conf.cipher) { 1248 case WLAN_CIPHER_SUITE_TKIP: 1249 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) 1250 return; 1251 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32; 1252 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16; 1253 break; 1254 case WLAN_CIPHER_SUITE_CCMP: 1255 case WLAN_CIPHER_SUITE_CCMP_256: 1256 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1257 return; 1258 if (tid < 0) 1259 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; 1260 else 1261 pn = key->u.ccmp.rx_pn[tid]; 1262 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN); 1263 break; 1264 case WLAN_CIPHER_SUITE_AES_CMAC: 1265 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1266 if (WARN_ON(tid != 0)) 1267 return; 1268 pn = key->u.aes_cmac.rx_pn; 1269 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN); 1270 break; 1271 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1272 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1273 if (WARN_ON(tid != 0)) 1274 return; 1275 pn = key->u.aes_gmac.rx_pn; 1276 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN); 1277 break; 1278 case WLAN_CIPHER_SUITE_GCMP: 1279 case WLAN_CIPHER_SUITE_GCMP_256: 1280 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1281 return; 1282 if (tid < 0) 1283 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; 1284 else 1285 pn = key->u.gcmp.rx_pn[tid]; 1286 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN); 1287 break; 1288 } 1289} 1290EXPORT_SYMBOL(ieee80211_get_key_rx_seq); 1291 1292void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf, 1293 int tid, struct ieee80211_key_seq *seq) 1294{ 1295 struct ieee80211_key *key; 1296 u8 *pn; 1297 1298 key = container_of(keyconf, struct ieee80211_key, conf); 1299 1300 switch (key->conf.cipher) { 1301 case WLAN_CIPHER_SUITE_TKIP: 1302 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) 1303 return; 1304 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32; 1305 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16; 1306 break; 1307 case WLAN_CIPHER_SUITE_CCMP: 1308 case WLAN_CIPHER_SUITE_CCMP_256: 1309 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1310 return; 1311 if (tid < 0) 1312 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; 1313 else 1314 pn = key->u.ccmp.rx_pn[tid]; 1315 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN); 1316 break; 1317 case WLAN_CIPHER_SUITE_AES_CMAC: 1318 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1319 if (WARN_ON(tid != 0)) 1320 return; 1321 pn = key->u.aes_cmac.rx_pn; 1322 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN); 1323 break; 1324 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1325 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1326 if (WARN_ON(tid != 0)) 1327 return; 1328 pn = key->u.aes_gmac.rx_pn; 1329 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN); 1330 break; 1331 case WLAN_CIPHER_SUITE_GCMP: 1332 case WLAN_CIPHER_SUITE_GCMP_256: 1333 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1334 return; 1335 if (tid < 0) 1336 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; 1337 else 1338 pn = key->u.gcmp.rx_pn[tid]; 1339 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN); 1340 break; 1341 default: 1342 WARN_ON(1); 1343 break; 1344 } 1345} 1346EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq); 1347 1348void ieee80211_remove_key(struct ieee80211_key_conf *keyconf) 1349{ 1350 struct ieee80211_key *key; 1351 1352 key = container_of(keyconf, struct ieee80211_key, conf); 1353 1354 lockdep_assert_wiphy(key->local->hw.wiphy); 1355 1356 /* 1357 * if key was uploaded, we assume the driver will/has remove(d) 1358 * it, so adjust bookkeeping accordingly 1359 */ 1360 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { 1361 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; 1362 1363 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | 1364 IEEE80211_KEY_FLAG_PUT_MIC_SPACE | 1365 IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) 1366 increment_tailroom_need_count(key->sdata); 1367 } 1368 1369 ieee80211_key_free(key, false); 1370} 1371EXPORT_SYMBOL_GPL(ieee80211_remove_key); 1372 1373struct ieee80211_key_conf * 1374ieee80211_gtk_rekey_add(struct ieee80211_vif *vif, 1375 struct ieee80211_key_conf *keyconf, 1376 int link_id) 1377{ 1378 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1379 struct ieee80211_local *local = sdata->local; 1380 struct ieee80211_key *key; 1381 int err; 1382 struct ieee80211_link_data *link_data = 1383 link_id < 0 ? &sdata->deflink : 1384 sdata_dereference(sdata->link[link_id], sdata); 1385 1386 if (WARN_ON(!link_data)) 1387 return ERR_PTR(-EINVAL); 1388 1389 if (WARN_ON(!local->wowlan)) 1390 return ERR_PTR(-EINVAL); 1391 1392 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 1393 return ERR_PTR(-EINVAL); 1394 1395 key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx, 1396 keyconf->keylen, keyconf->key, 1397 0, NULL); 1398 if (IS_ERR(key)) 1399 return ERR_CAST(key); 1400 1401 if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED) 1402 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT; 1403 1404 key->conf.link_id = link_id; 1405 1406 err = ieee80211_key_link(key, link_data, NULL); 1407 if (err) 1408 return ERR_PTR(err); 1409 1410 return &key->conf; 1411} 1412EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add); 1413 1414void ieee80211_key_mic_failure(struct ieee80211_key_conf *keyconf) 1415{ 1416 struct ieee80211_key *key; 1417 1418 key = container_of(keyconf, struct ieee80211_key, conf); 1419 1420 switch (key->conf.cipher) { 1421 case WLAN_CIPHER_SUITE_AES_CMAC: 1422 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1423 key->u.aes_cmac.icverrors++; 1424 break; 1425 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1426 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1427 key->u.aes_gmac.icverrors++; 1428 break; 1429 default: 1430 /* ignore the others for now, we don't keep counters now */ 1431 break; 1432 } 1433} 1434EXPORT_SYMBOL_GPL(ieee80211_key_mic_failure); 1435 1436void ieee80211_key_replay(struct ieee80211_key_conf *keyconf) 1437{ 1438 struct ieee80211_key *key; 1439 1440 key = container_of(keyconf, struct ieee80211_key, conf); 1441 1442 switch (key->conf.cipher) { 1443 case WLAN_CIPHER_SUITE_CCMP: 1444 case WLAN_CIPHER_SUITE_CCMP_256: 1445 key->u.ccmp.replays++; 1446 break; 1447 case WLAN_CIPHER_SUITE_AES_CMAC: 1448 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1449 key->u.aes_cmac.replays++; 1450 break; 1451 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1452 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1453 key->u.aes_gmac.replays++; 1454 break; 1455 case WLAN_CIPHER_SUITE_GCMP: 1456 case WLAN_CIPHER_SUITE_GCMP_256: 1457 key->u.gcmp.replays++; 1458 break; 1459 } 1460} 1461EXPORT_SYMBOL_GPL(ieee80211_key_replay); 1462 1463int ieee80211_key_switch_links(struct ieee80211_sub_if_data *sdata, 1464 unsigned long del_links_mask, 1465 unsigned long add_links_mask) 1466{ 1467 struct ieee80211_key *key; 1468 int ret; 1469 1470 list_for_each_entry(key, &sdata->key_list, list) { 1471 if (key->conf.link_id < 0 || 1472 !(del_links_mask & BIT(key->conf.link_id))) 1473 continue; 1474 1475 /* shouldn't happen for per-link keys */ 1476 WARN_ON(key->sta); 1477 1478 ieee80211_key_disable_hw_accel(key); 1479 } 1480 1481 list_for_each_entry(key, &sdata->key_list, list) { 1482 if (key->conf.link_id < 0 || 1483 !(add_links_mask & BIT(key->conf.link_id))) 1484 continue; 1485 1486 /* shouldn't happen for per-link keys */ 1487 WARN_ON(key->sta); 1488 1489 ret = ieee80211_key_enable_hw_accel(key); 1490 if (ret) 1491 return ret; 1492 } 1493 1494 return 0; 1495} 1496