1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 5 * Copyright 2007-2008 Johannes Berg <johannes@sipsolutions.net> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 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 <asm/unaligned.h> 21 #include "ieee80211_i.h" 22 #include "driver-ops.h" 23 #include "debugfs_key.h" 24 #include "aes_ccm.h" 25 #include "aes_cmac.h" 26 27 28 /** 29 * DOC: Key handling basics 30 * 31 * Key handling in mac80211 is done based on per-interface (sub_if_data) 32 * keys and per-station keys. Since each station belongs to an interface, 33 * each station key also belongs to that interface. 34 * 35 * Hardware acceleration is done on a best-effort basis for algorithms 36 * that are implemented in software, for each key the hardware is asked 37 * to enable that key for offloading but if it cannot do that the key is 38 * simply kept for software encryption (unless it is for an algorithm 39 * that isn't implemented in software). 40 * There is currently no way of knowing whether a key is handled in SW 41 * or HW except by looking into debugfs. 42 * 43 * All key management is internally protected by a mutex. Within all 44 * other parts of mac80211, key references are, just as STA structure 45 * references, protected by RCU. Note, however, that some things are 46 * unprotected, namely the key->sta dereferences within the hardware 47 * acceleration functions. This means that sta_info_destroy() must 48 * remove the key which waits for an RCU grace period. 49 */ 50 51 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; 52 53 static void assert_key_lock(struct ieee80211_local *local) 54 { 55 lockdep_assert_held(&local->key_mtx); 56 } 57 58 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata) 59 { 60 /* 61 * When this count is zero, SKB resizing for allocating tailroom 62 * for IV or MMIC is skipped. But, this check has created two race 63 * cases in xmit path while transiting from zero count to one: 64 * 65 * 1. SKB resize was skipped because no key was added but just before 66 * the xmit key is added and SW encryption kicks off. 67 * 68 * 2. SKB resize was skipped because all the keys were hw planted but 69 * just before xmit one of the key is deleted and SW encryption kicks 70 * off. 71 * 72 * In both the above case SW encryption will find not enough space for 73 * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c) 74 * 75 * Solution has been explained at 76 * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net 77 */ 78 79 if (!sdata->crypto_tx_tailroom_needed_cnt++) { 80 /* 81 * Flush all XMIT packets currently using HW encryption or no 82 * encryption at all if the count transition is from 0 -> 1. 83 */ 84 synchronize_net(); 85 } 86 } 87 88 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key) 89 { 90 struct ieee80211_sub_if_data *sdata; 91 struct sta_info *sta; 92 int ret; 93 94 might_sleep(); 95 96 if (!key->local->ops->set_key) 97 goto out_unsupported; 98 99 assert_key_lock(key->local); 100 101 sta = key->sta; 102 103 /* 104 * If this is a per-STA GTK, check if it 105 * is supported; if not, return. 106 */ 107 if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) && 108 !(key->local->hw.flags & IEEE80211_HW_SUPPORTS_PER_STA_GTK)) 109 goto out_unsupported; 110 111 if (sta && !sta->uploaded) 112 goto out_unsupported; 113 114 sdata = key->sdata; 115 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 116 /* 117 * The driver doesn't know anything about VLAN interfaces. 118 * Hence, don't send GTKs for VLAN interfaces to the driver. 119 */ 120 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) 121 goto out_unsupported; 122 } 123 124 ret = drv_set_key(key->local, SET_KEY, sdata, 125 sta ? &sta->sta : NULL, &key->conf); 126 127 if (!ret) { 128 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; 129 130 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || 131 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) || 132 (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))) 133 sdata->crypto_tx_tailroom_needed_cnt--; 134 135 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && 136 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)); 137 138 return 0; 139 } 140 141 if (ret != -ENOSPC && ret != -EOPNOTSUPP) 142 sdata_err(sdata, 143 "failed to set key (%d, %pM) to hardware (%d)\n", 144 key->conf.keyidx, 145 sta ? sta->sta.addr : bcast_addr, ret); 146 147 out_unsupported: 148 switch (key->conf.cipher) { 149 case WLAN_CIPHER_SUITE_WEP40: 150 case WLAN_CIPHER_SUITE_WEP104: 151 case WLAN_CIPHER_SUITE_TKIP: 152 case WLAN_CIPHER_SUITE_CCMP: 153 case WLAN_CIPHER_SUITE_AES_CMAC: 154 /* all of these we can do in software */ 155 return 0; 156 default: 157 return -EINVAL; 158 } 159 } 160 161 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key) 162 { 163 struct ieee80211_sub_if_data *sdata; 164 struct sta_info *sta; 165 int ret; 166 167 might_sleep(); 168 169 if (!key || !key->local->ops->set_key) 170 return; 171 172 assert_key_lock(key->local); 173 174 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 175 return; 176 177 sta = key->sta; 178 sdata = key->sdata; 179 180 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || 181 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) || 182 (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))) 183 increment_tailroom_need_count(sdata); 184 185 ret = drv_set_key(key->local, DISABLE_KEY, sdata, 186 sta ? &sta->sta : NULL, &key->conf); 187 188 if (ret) 189 sdata_err(sdata, 190 "failed to remove key (%d, %pM) from hardware (%d)\n", 191 key->conf.keyidx, 192 sta ? sta->sta.addr : bcast_addr, ret); 193 194 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; 195 } 196 197 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, 198 int idx, bool uni, bool multi) 199 { 200 struct ieee80211_key *key = NULL; 201 202 assert_key_lock(sdata->local); 203 204 if (idx >= 0 && idx < NUM_DEFAULT_KEYS) 205 key = key_mtx_dereference(sdata->local, sdata->keys[idx]); 206 207 if (uni) { 208 rcu_assign_pointer(sdata->default_unicast_key, key); 209 drv_set_default_unicast_key(sdata->local, sdata, idx); 210 } 211 212 if (multi) 213 rcu_assign_pointer(sdata->default_multicast_key, key); 214 215 ieee80211_debugfs_key_update_default(sdata); 216 } 217 218 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx, 219 bool uni, bool multi) 220 { 221 mutex_lock(&sdata->local->key_mtx); 222 __ieee80211_set_default_key(sdata, idx, uni, multi); 223 mutex_unlock(&sdata->local->key_mtx); 224 } 225 226 static void 227 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx) 228 { 229 struct ieee80211_key *key = NULL; 230 231 assert_key_lock(sdata->local); 232 233 if (idx >= NUM_DEFAULT_KEYS && 234 idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 235 key = key_mtx_dereference(sdata->local, sdata->keys[idx]); 236 237 rcu_assign_pointer(sdata->default_mgmt_key, key); 238 239 ieee80211_debugfs_key_update_default(sdata); 240 } 241 242 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, 243 int idx) 244 { 245 mutex_lock(&sdata->local->key_mtx); 246 __ieee80211_set_default_mgmt_key(sdata, idx); 247 mutex_unlock(&sdata->local->key_mtx); 248 } 249 250 251 static void ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, 252 struct sta_info *sta, 253 bool pairwise, 254 struct ieee80211_key *old, 255 struct ieee80211_key *new) 256 { 257 int idx; 258 bool defunikey, defmultikey, defmgmtkey; 259 260 if (new) 261 list_add_tail(&new->list, &sdata->key_list); 262 263 if (sta && pairwise) { 264 rcu_assign_pointer(sta->ptk, new); 265 } else if (sta) { 266 if (old) 267 idx = old->conf.keyidx; 268 else 269 idx = new->conf.keyidx; 270 rcu_assign_pointer(sta->gtk[idx], new); 271 } else { 272 WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx); 273 274 if (old) 275 idx = old->conf.keyidx; 276 else 277 idx = new->conf.keyidx; 278 279 defunikey = old && 280 old == key_mtx_dereference(sdata->local, 281 sdata->default_unicast_key); 282 defmultikey = old && 283 old == key_mtx_dereference(sdata->local, 284 sdata->default_multicast_key); 285 defmgmtkey = old && 286 old == key_mtx_dereference(sdata->local, 287 sdata->default_mgmt_key); 288 289 if (defunikey && !new) 290 __ieee80211_set_default_key(sdata, -1, true, false); 291 if (defmultikey && !new) 292 __ieee80211_set_default_key(sdata, -1, false, true); 293 if (defmgmtkey && !new) 294 __ieee80211_set_default_mgmt_key(sdata, -1); 295 296 rcu_assign_pointer(sdata->keys[idx], new); 297 if (defunikey && new) 298 __ieee80211_set_default_key(sdata, new->conf.keyidx, 299 true, false); 300 if (defmultikey && new) 301 __ieee80211_set_default_key(sdata, new->conf.keyidx, 302 false, true); 303 if (defmgmtkey && new) 304 __ieee80211_set_default_mgmt_key(sdata, 305 new->conf.keyidx); 306 } 307 308 if (old) 309 list_del(&old->list); 310 } 311 312 struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, 313 const u8 *key_data, 314 size_t seq_len, const u8 *seq) 315 { 316 struct ieee80211_key *key; 317 int i, j, err; 318 319 BUG_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS); 320 321 key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); 322 if (!key) 323 return ERR_PTR(-ENOMEM); 324 325 /* 326 * Default to software encryption; we'll later upload the 327 * key to the hardware if possible. 328 */ 329 key->conf.flags = 0; 330 key->flags = 0; 331 332 key->conf.cipher = cipher; 333 key->conf.keyidx = idx; 334 key->conf.keylen = key_len; 335 switch (cipher) { 336 case WLAN_CIPHER_SUITE_WEP40: 337 case WLAN_CIPHER_SUITE_WEP104: 338 key->conf.iv_len = WEP_IV_LEN; 339 key->conf.icv_len = WEP_ICV_LEN; 340 break; 341 case WLAN_CIPHER_SUITE_TKIP: 342 key->conf.iv_len = TKIP_IV_LEN; 343 key->conf.icv_len = TKIP_ICV_LEN; 344 if (seq) { 345 for (i = 0; i < IEEE80211_NUM_TIDS; i++) { 346 key->u.tkip.rx[i].iv32 = 347 get_unaligned_le32(&seq[2]); 348 key->u.tkip.rx[i].iv16 = 349 get_unaligned_le16(seq); 350 } 351 } 352 spin_lock_init(&key->u.tkip.txlock); 353 break; 354 case WLAN_CIPHER_SUITE_CCMP: 355 key->conf.iv_len = CCMP_HDR_LEN; 356 key->conf.icv_len = CCMP_MIC_LEN; 357 if (seq) { 358 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) 359 for (j = 0; j < CCMP_PN_LEN; j++) 360 key->u.ccmp.rx_pn[i][j] = 361 seq[CCMP_PN_LEN - j - 1]; 362 } 363 /* 364 * Initialize AES key state here as an optimization so that 365 * it does not need to be initialized for every packet. 366 */ 367 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(key_data); 368 if (IS_ERR(key->u.ccmp.tfm)) { 369 err = PTR_ERR(key->u.ccmp.tfm); 370 kfree(key); 371 return ERR_PTR(err); 372 } 373 break; 374 case WLAN_CIPHER_SUITE_AES_CMAC: 375 key->conf.iv_len = 0; 376 key->conf.icv_len = sizeof(struct ieee80211_mmie); 377 if (seq) 378 for (j = 0; j < CMAC_PN_LEN; j++) 379 key->u.aes_cmac.rx_pn[j] = 380 seq[CMAC_PN_LEN - j - 1]; 381 /* 382 * Initialize AES key state here as an optimization so that 383 * it does not need to be initialized for every packet. 384 */ 385 key->u.aes_cmac.tfm = 386 ieee80211_aes_cmac_key_setup(key_data); 387 if (IS_ERR(key->u.aes_cmac.tfm)) { 388 err = PTR_ERR(key->u.aes_cmac.tfm); 389 kfree(key); 390 return ERR_PTR(err); 391 } 392 break; 393 } 394 memcpy(key->conf.key, key_data, key_len); 395 INIT_LIST_HEAD(&key->list); 396 397 return key; 398 } 399 400 static void ieee80211_key_free_common(struct ieee80211_key *key) 401 { 402 if (key->conf.cipher == WLAN_CIPHER_SUITE_CCMP) 403 ieee80211_aes_key_free(key->u.ccmp.tfm); 404 if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC) 405 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); 406 kfree(key); 407 } 408 409 static void __ieee80211_key_destroy(struct ieee80211_key *key, 410 bool delay_tailroom) 411 { 412 if (key->local) 413 ieee80211_key_disable_hw_accel(key); 414 415 if (key->local) { 416 struct ieee80211_sub_if_data *sdata = key->sdata; 417 418 ieee80211_debugfs_key_remove(key); 419 420 if (delay_tailroom) { 421 /* see ieee80211_delayed_tailroom_dec */ 422 sdata->crypto_tx_tailroom_pending_dec++; 423 schedule_delayed_work(&sdata->dec_tailroom_needed_wk, 424 HZ/2); 425 } else { 426 sdata->crypto_tx_tailroom_needed_cnt--; 427 } 428 } 429 430 ieee80211_key_free_common(key); 431 } 432 433 static void ieee80211_key_destroy(struct ieee80211_key *key, 434 bool delay_tailroom) 435 { 436 if (!key) 437 return; 438 439 /* 440 * Synchronize so the TX path can no longer be using 441 * this key before we free/remove it. 442 */ 443 synchronize_net(); 444 445 __ieee80211_key_destroy(key, delay_tailroom); 446 } 447 448 void ieee80211_key_free_unused(struct ieee80211_key *key) 449 { 450 WARN_ON(key->sdata || key->local); 451 ieee80211_key_free_common(key); 452 } 453 454 int ieee80211_key_link(struct ieee80211_key *key, 455 struct ieee80211_sub_if_data *sdata, 456 struct sta_info *sta) 457 { 458 struct ieee80211_key *old_key; 459 int idx, ret; 460 bool pairwise; 461 462 BUG_ON(!sdata); 463 BUG_ON(!key); 464 465 pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE; 466 idx = key->conf.keyidx; 467 key->local = sdata->local; 468 key->sdata = sdata; 469 key->sta = sta; 470 471 mutex_lock(&sdata->local->key_mtx); 472 473 if (sta && pairwise) 474 old_key = key_mtx_dereference(sdata->local, sta->ptk); 475 else if (sta) 476 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]); 477 else 478 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]); 479 480 increment_tailroom_need_count(sdata); 481 482 ieee80211_key_replace(sdata, sta, pairwise, old_key, key); 483 ieee80211_key_destroy(old_key, true); 484 485 ieee80211_debugfs_key_add(key); 486 487 ret = ieee80211_key_enable_hw_accel(key); 488 489 if (ret) 490 ieee80211_key_free(key, true); 491 492 mutex_unlock(&sdata->local->key_mtx); 493 494 return ret; 495 } 496 497 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom) 498 { 499 if (!key) 500 return; 501 502 /* 503 * Replace key with nothingness if it was ever used. 504 */ 505 if (key->sdata) 506 ieee80211_key_replace(key->sdata, key->sta, 507 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 508 key, NULL); 509 ieee80211_key_destroy(key, delay_tailroom); 510 } 511 512 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata) 513 { 514 struct ieee80211_key *key; 515 516 ASSERT_RTNL(); 517 518 if (WARN_ON(!ieee80211_sdata_running(sdata))) 519 return; 520 521 mutex_lock(&sdata->local->key_mtx); 522 523 sdata->crypto_tx_tailroom_needed_cnt = 0; 524 525 list_for_each_entry(key, &sdata->key_list, list) { 526 increment_tailroom_need_count(sdata); 527 ieee80211_key_enable_hw_accel(key); 528 } 529 530 mutex_unlock(&sdata->local->key_mtx); 531 } 532 533 void ieee80211_iter_keys(struct ieee80211_hw *hw, 534 struct ieee80211_vif *vif, 535 void (*iter)(struct ieee80211_hw *hw, 536 struct ieee80211_vif *vif, 537 struct ieee80211_sta *sta, 538 struct ieee80211_key_conf *key, 539 void *data), 540 void *iter_data) 541 { 542 struct ieee80211_local *local = hw_to_local(hw); 543 struct ieee80211_key *key; 544 struct ieee80211_sub_if_data *sdata; 545 546 ASSERT_RTNL(); 547 548 mutex_lock(&local->key_mtx); 549 if (vif) { 550 sdata = vif_to_sdata(vif); 551 list_for_each_entry(key, &sdata->key_list, list) 552 iter(hw, &sdata->vif, 553 key->sta ? &key->sta->sta : NULL, 554 &key->conf, iter_data); 555 } else { 556 list_for_each_entry(sdata, &local->interfaces, list) 557 list_for_each_entry(key, &sdata->key_list, list) 558 iter(hw, &sdata->vif, 559 key->sta ? &key->sta->sta : NULL, 560 &key->conf, iter_data); 561 } 562 mutex_unlock(&local->key_mtx); 563 } 564 EXPORT_SYMBOL(ieee80211_iter_keys); 565 566 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata) 567 { 568 struct ieee80211_key *key, *tmp; 569 LIST_HEAD(keys); 570 571 cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk); 572 573 mutex_lock(&sdata->local->key_mtx); 574 575 sdata->crypto_tx_tailroom_needed_cnt -= 576 sdata->crypto_tx_tailroom_pending_dec; 577 sdata->crypto_tx_tailroom_pending_dec = 0; 578 579 ieee80211_debugfs_key_remove_mgmt_default(sdata); 580 581 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) { 582 ieee80211_key_replace(key->sdata, key->sta, 583 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 584 key, NULL); 585 list_add_tail(&key->list, &keys); 586 } 587 588 ieee80211_debugfs_key_update_default(sdata); 589 590 if (!list_empty(&keys)) { 591 synchronize_net(); 592 list_for_each_entry_safe(key, tmp, &keys, list) 593 __ieee80211_key_destroy(key, false); 594 } 595 596 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || 597 sdata->crypto_tx_tailroom_pending_dec); 598 599 mutex_unlock(&sdata->local->key_mtx); 600 } 601 602 void ieee80211_free_sta_keys(struct ieee80211_local *local, 603 struct sta_info *sta) 604 { 605 struct ieee80211_key *key, *tmp; 606 LIST_HEAD(keys); 607 int i; 608 609 mutex_lock(&local->key_mtx); 610 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 611 key = key_mtx_dereference(local, sta->gtk[i]); 612 if (!key) 613 continue; 614 ieee80211_key_replace(key->sdata, key->sta, 615 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 616 key, NULL); 617 list_add(&key->list, &keys); 618 } 619 620 key = key_mtx_dereference(local, sta->ptk); 621 if (key) { 622 ieee80211_key_replace(key->sdata, key->sta, 623 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 624 key, NULL); 625 list_add(&key->list, &keys); 626 } 627 628 /* 629 * NB: the station code relies on this being 630 * done even if there aren't any keys 631 */ 632 synchronize_net(); 633 634 list_for_each_entry_safe(key, tmp, &keys, list) 635 __ieee80211_key_destroy(key, true); 636 637 mutex_unlock(&local->key_mtx); 638 } 639 640 void ieee80211_delayed_tailroom_dec(struct work_struct *wk) 641 { 642 struct ieee80211_sub_if_data *sdata; 643 644 sdata = container_of(wk, struct ieee80211_sub_if_data, 645 dec_tailroom_needed_wk.work); 646 647 /* 648 * The reason for the delayed tailroom needed decrementing is to 649 * make roaming faster: during roaming, all keys are first deleted 650 * and then new keys are installed. The first new key causes the 651 * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes 652 * the cost of synchronize_net() (which can be slow). Avoid this 653 * by deferring the crypto_tx_tailroom_needed_cnt decrementing on 654 * key removal for a while, so if we roam the value is larger than 655 * zero and no 0->1 transition happens. 656 * 657 * The cost is that if the AP switching was from an AP with keys 658 * to one without, we still allocate tailroom while it would no 659 * longer be needed. However, in the typical (fast) roaming case 660 * within an ESS this usually won't happen. 661 */ 662 663 mutex_lock(&sdata->local->key_mtx); 664 sdata->crypto_tx_tailroom_needed_cnt -= 665 sdata->crypto_tx_tailroom_pending_dec; 666 sdata->crypto_tx_tailroom_pending_dec = 0; 667 mutex_unlock(&sdata->local->key_mtx); 668 } 669 670 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid, 671 const u8 *replay_ctr, gfp_t gfp) 672 { 673 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 674 675 trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr); 676 677 cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp); 678 } 679 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify); 680 681 void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf, 682 struct ieee80211_key_seq *seq) 683 { 684 struct ieee80211_key *key; 685 u64 pn64; 686 687 if (WARN_ON(!(keyconf->flags & IEEE80211_KEY_FLAG_GENERATE_IV))) 688 return; 689 690 key = container_of(keyconf, struct ieee80211_key, conf); 691 692 switch (key->conf.cipher) { 693 case WLAN_CIPHER_SUITE_TKIP: 694 seq->tkip.iv32 = key->u.tkip.tx.iv32; 695 seq->tkip.iv16 = key->u.tkip.tx.iv16; 696 break; 697 case WLAN_CIPHER_SUITE_CCMP: 698 pn64 = atomic64_read(&key->u.ccmp.tx_pn); 699 seq->ccmp.pn[5] = pn64; 700 seq->ccmp.pn[4] = pn64 >> 8; 701 seq->ccmp.pn[3] = pn64 >> 16; 702 seq->ccmp.pn[2] = pn64 >> 24; 703 seq->ccmp.pn[1] = pn64 >> 32; 704 seq->ccmp.pn[0] = pn64 >> 40; 705 break; 706 case WLAN_CIPHER_SUITE_AES_CMAC: 707 pn64 = atomic64_read(&key->u.aes_cmac.tx_pn); 708 seq->ccmp.pn[5] = pn64; 709 seq->ccmp.pn[4] = pn64 >> 8; 710 seq->ccmp.pn[3] = pn64 >> 16; 711 seq->ccmp.pn[2] = pn64 >> 24; 712 seq->ccmp.pn[1] = pn64 >> 32; 713 seq->ccmp.pn[0] = pn64 >> 40; 714 break; 715 default: 716 WARN_ON(1); 717 } 718 } 719 EXPORT_SYMBOL(ieee80211_get_key_tx_seq); 720 721 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf, 722 int tid, struct ieee80211_key_seq *seq) 723 { 724 struct ieee80211_key *key; 725 const u8 *pn; 726 727 key = container_of(keyconf, struct ieee80211_key, conf); 728 729 switch (key->conf.cipher) { 730 case WLAN_CIPHER_SUITE_TKIP: 731 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) 732 return; 733 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32; 734 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16; 735 break; 736 case WLAN_CIPHER_SUITE_CCMP: 737 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 738 return; 739 if (tid < 0) 740 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; 741 else 742 pn = key->u.ccmp.rx_pn[tid]; 743 memcpy(seq->ccmp.pn, pn, CCMP_PN_LEN); 744 break; 745 case WLAN_CIPHER_SUITE_AES_CMAC: 746 if (WARN_ON(tid != 0)) 747 return; 748 pn = key->u.aes_cmac.rx_pn; 749 memcpy(seq->aes_cmac.pn, pn, CMAC_PN_LEN); 750 break; 751 } 752 } 753 EXPORT_SYMBOL(ieee80211_get_key_rx_seq); 754