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 "ieee80211_i.h" 21 #include "driver-ops.h" 22 #include "debugfs_key.h" 23 #include "aes_ccm.h" 24 #include "aes_cmac.h" 25 26 27 /** 28 * DOC: Key handling basics 29 * 30 * Key handling in mac80211 is done based on per-interface (sub_if_data) 31 * keys and per-station keys. Since each station belongs to an interface, 32 * each station key also belongs to that interface. 33 * 34 * Hardware acceleration is done on a best-effort basis for algorithms 35 * that are implemented in software, for each key the hardware is asked 36 * to enable that key for offloading but if it cannot do that the key is 37 * simply kept for software encryption (unless it is for an algorithm 38 * that isn't implemented in software). 39 * There is currently no way of knowing whether a key is handled in SW 40 * or HW except by looking into debugfs. 41 * 42 * All key management is internally protected by a mutex. Within all 43 * other parts of mac80211, key references are, just as STA structure 44 * references, protected by RCU. Note, however, that some things are 45 * unprotected, namely the key->sta dereferences within the hardware 46 * acceleration functions. This means that sta_info_destroy() must 47 * remove the key which waits for an RCU grace period. 48 */ 49 50 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; 51 52 static void assert_key_lock(struct ieee80211_local *local) 53 { 54 lockdep_assert_held(&local->key_mtx); 55 } 56 57 static struct ieee80211_sta *get_sta_for_key(struct ieee80211_key *key) 58 { 59 if (key->sta) 60 return &key->sta->sta; 61 62 return NULL; 63 } 64 65 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata) 66 { 67 /* 68 * When this count is zero, SKB resizing for allocating tailroom 69 * for IV or MMIC is skipped. But, this check has created two race 70 * cases in xmit path while transiting from zero count to one: 71 * 72 * 1. SKB resize was skipped because no key was added but just before 73 * the xmit key is added and SW encryption kicks off. 74 * 75 * 2. SKB resize was skipped because all the keys were hw planted but 76 * just before xmit one of the key is deleted and SW encryption kicks 77 * off. 78 * 79 * In both the above case SW encryption will find not enough space for 80 * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c) 81 * 82 * Solution has been explained at 83 * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net 84 */ 85 86 if (!sdata->crypto_tx_tailroom_needed_cnt++) { 87 /* 88 * Flush all XMIT packets currently using HW encryption or no 89 * encryption at all if the count transition is from 0 -> 1. 90 */ 91 synchronize_net(); 92 } 93 } 94 95 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key) 96 { 97 struct ieee80211_sub_if_data *sdata; 98 struct ieee80211_sta *sta; 99 int ret; 100 101 might_sleep(); 102 103 if (!key->local->ops->set_key) 104 goto out_unsupported; 105 106 assert_key_lock(key->local); 107 108 sta = get_sta_for_key(key); 109 110 /* 111 * If this is a per-STA GTK, check if it 112 * is supported; if not, return. 113 */ 114 if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) && 115 !(key->local->hw.flags & IEEE80211_HW_SUPPORTS_PER_STA_GTK)) 116 goto out_unsupported; 117 118 sdata = key->sdata; 119 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 120 /* 121 * The driver doesn't know anything about VLAN interfaces. 122 * Hence, don't send GTKs for VLAN interfaces to the driver. 123 */ 124 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) 125 goto out_unsupported; 126 sdata = container_of(sdata->bss, 127 struct ieee80211_sub_if_data, 128 u.ap); 129 } 130 131 ret = drv_set_key(key->local, SET_KEY, sdata, sta, &key->conf); 132 133 if (!ret) { 134 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; 135 136 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || 137 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))) 138 sdata->crypto_tx_tailroom_needed_cnt--; 139 140 return 0; 141 } 142 143 if (ret != -ENOSPC && ret != -EOPNOTSUPP) 144 wiphy_err(key->local->hw.wiphy, 145 "failed to set key (%d, %pM) to hardware (%d)\n", 146 key->conf.keyidx, sta ? sta->addr : bcast_addr, ret); 147 148 out_unsupported: 149 switch (key->conf.cipher) { 150 case WLAN_CIPHER_SUITE_WEP40: 151 case WLAN_CIPHER_SUITE_WEP104: 152 case WLAN_CIPHER_SUITE_TKIP: 153 case WLAN_CIPHER_SUITE_CCMP: 154 case WLAN_CIPHER_SUITE_AES_CMAC: 155 /* all of these we can do in software */ 156 return 0; 157 default: 158 return -EINVAL; 159 } 160 } 161 162 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key) 163 { 164 struct ieee80211_sub_if_data *sdata; 165 struct ieee80211_sta *sta; 166 int ret; 167 168 might_sleep(); 169 170 if (!key || !key->local->ops->set_key) 171 return; 172 173 assert_key_lock(key->local); 174 175 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 176 return; 177 178 sta = get_sta_for_key(key); 179 sdata = key->sdata; 180 181 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || 182 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))) 183 increment_tailroom_need_count(sdata); 184 185 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 186 sdata = container_of(sdata->bss, 187 struct ieee80211_sub_if_data, 188 u.ap); 189 190 ret = drv_set_key(key->local, DISABLE_KEY, sdata, 191 sta, &key->conf); 192 193 if (ret) 194 wiphy_err(key->local->hw.wiphy, 195 "failed to remove key (%d, %pM) from hardware (%d)\n", 196 key->conf.keyidx, sta ? sta->addr : bcast_addr, ret); 197 198 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; 199 } 200 201 void ieee80211_key_removed(struct ieee80211_key_conf *key_conf) 202 { 203 struct ieee80211_key *key; 204 205 key = container_of(key_conf, struct ieee80211_key, conf); 206 207 might_sleep(); 208 assert_key_lock(key->local); 209 210 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; 211 212 /* 213 * Flush TX path to avoid attempts to use this key 214 * after this function returns. Until then, drivers 215 * must be prepared to handle the key. 216 */ 217 synchronize_rcu(); 218 } 219 EXPORT_SYMBOL_GPL(ieee80211_key_removed); 220 221 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, 222 int idx, bool uni, bool multi) 223 { 224 struct ieee80211_key *key = NULL; 225 226 assert_key_lock(sdata->local); 227 228 if (idx >= 0 && idx < NUM_DEFAULT_KEYS) 229 key = key_mtx_dereference(sdata->local, sdata->keys[idx]); 230 231 if (uni) 232 rcu_assign_pointer(sdata->default_unicast_key, key); 233 if (multi) 234 rcu_assign_pointer(sdata->default_multicast_key, key); 235 236 ieee80211_debugfs_key_update_default(sdata); 237 } 238 239 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx, 240 bool uni, bool multi) 241 { 242 mutex_lock(&sdata->local->key_mtx); 243 __ieee80211_set_default_key(sdata, idx, uni, multi); 244 mutex_unlock(&sdata->local->key_mtx); 245 } 246 247 static void 248 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx) 249 { 250 struct ieee80211_key *key = NULL; 251 252 assert_key_lock(sdata->local); 253 254 if (idx >= NUM_DEFAULT_KEYS && 255 idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 256 key = key_mtx_dereference(sdata->local, sdata->keys[idx]); 257 258 rcu_assign_pointer(sdata->default_mgmt_key, key); 259 260 ieee80211_debugfs_key_update_default(sdata); 261 } 262 263 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, 264 int idx) 265 { 266 mutex_lock(&sdata->local->key_mtx); 267 __ieee80211_set_default_mgmt_key(sdata, idx); 268 mutex_unlock(&sdata->local->key_mtx); 269 } 270 271 272 static void __ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, 273 struct sta_info *sta, 274 bool pairwise, 275 struct ieee80211_key *old, 276 struct ieee80211_key *new) 277 { 278 int idx; 279 bool defunikey, defmultikey, defmgmtkey; 280 281 if (new) 282 list_add_tail(&new->list, &sdata->key_list); 283 284 if (sta && pairwise) { 285 rcu_assign_pointer(sta->ptk, new); 286 } else if (sta) { 287 if (old) 288 idx = old->conf.keyidx; 289 else 290 idx = new->conf.keyidx; 291 rcu_assign_pointer(sta->gtk[idx], new); 292 } else { 293 WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx); 294 295 if (old) 296 idx = old->conf.keyidx; 297 else 298 idx = new->conf.keyidx; 299 300 defunikey = old && 301 old == key_mtx_dereference(sdata->local, 302 sdata->default_unicast_key); 303 defmultikey = old && 304 old == key_mtx_dereference(sdata->local, 305 sdata->default_multicast_key); 306 defmgmtkey = old && 307 old == key_mtx_dereference(sdata->local, 308 sdata->default_mgmt_key); 309 310 if (defunikey && !new) 311 __ieee80211_set_default_key(sdata, -1, true, false); 312 if (defmultikey && !new) 313 __ieee80211_set_default_key(sdata, -1, false, true); 314 if (defmgmtkey && !new) 315 __ieee80211_set_default_mgmt_key(sdata, -1); 316 317 rcu_assign_pointer(sdata->keys[idx], new); 318 if (defunikey && new) 319 __ieee80211_set_default_key(sdata, new->conf.keyidx, 320 true, false); 321 if (defmultikey && new) 322 __ieee80211_set_default_key(sdata, new->conf.keyidx, 323 false, true); 324 if (defmgmtkey && new) 325 __ieee80211_set_default_mgmt_key(sdata, 326 new->conf.keyidx); 327 } 328 329 if (old) 330 list_del(&old->list); 331 } 332 333 struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, 334 const u8 *key_data, 335 size_t seq_len, const u8 *seq) 336 { 337 struct ieee80211_key *key; 338 int i, j, err; 339 340 BUG_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS); 341 342 key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); 343 if (!key) 344 return ERR_PTR(-ENOMEM); 345 346 /* 347 * Default to software encryption; we'll later upload the 348 * key to the hardware if possible. 349 */ 350 key->conf.flags = 0; 351 key->flags = 0; 352 353 key->conf.cipher = cipher; 354 key->conf.keyidx = idx; 355 key->conf.keylen = key_len; 356 switch (cipher) { 357 case WLAN_CIPHER_SUITE_WEP40: 358 case WLAN_CIPHER_SUITE_WEP104: 359 key->conf.iv_len = WEP_IV_LEN; 360 key->conf.icv_len = WEP_ICV_LEN; 361 break; 362 case WLAN_CIPHER_SUITE_TKIP: 363 key->conf.iv_len = TKIP_IV_LEN; 364 key->conf.icv_len = TKIP_ICV_LEN; 365 if (seq) { 366 for (i = 0; i < NUM_RX_DATA_QUEUES; i++) { 367 key->u.tkip.rx[i].iv32 = 368 get_unaligned_le32(&seq[2]); 369 key->u.tkip.rx[i].iv16 = 370 get_unaligned_le16(seq); 371 } 372 } 373 spin_lock_init(&key->u.tkip.txlock); 374 break; 375 case WLAN_CIPHER_SUITE_CCMP: 376 key->conf.iv_len = CCMP_HDR_LEN; 377 key->conf.icv_len = CCMP_MIC_LEN; 378 if (seq) { 379 for (i = 0; i < NUM_RX_DATA_QUEUES + 1; i++) 380 for (j = 0; j < CCMP_PN_LEN; j++) 381 key->u.ccmp.rx_pn[i][j] = 382 seq[CCMP_PN_LEN - j - 1]; 383 } 384 /* 385 * Initialize AES key state here as an optimization so that 386 * it does not need to be initialized for every packet. 387 */ 388 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(key_data); 389 if (IS_ERR(key->u.ccmp.tfm)) { 390 err = PTR_ERR(key->u.ccmp.tfm); 391 kfree(key); 392 return ERR_PTR(err); 393 } 394 break; 395 case WLAN_CIPHER_SUITE_AES_CMAC: 396 key->conf.iv_len = 0; 397 key->conf.icv_len = sizeof(struct ieee80211_mmie); 398 if (seq) 399 for (j = 0; j < 6; j++) 400 key->u.aes_cmac.rx_pn[j] = seq[6 - j - 1]; 401 /* 402 * Initialize AES key state here as an optimization so that 403 * it does not need to be initialized for every packet. 404 */ 405 key->u.aes_cmac.tfm = 406 ieee80211_aes_cmac_key_setup(key_data); 407 if (IS_ERR(key->u.aes_cmac.tfm)) { 408 err = PTR_ERR(key->u.aes_cmac.tfm); 409 kfree(key); 410 return ERR_PTR(err); 411 } 412 break; 413 } 414 memcpy(key->conf.key, key_data, key_len); 415 INIT_LIST_HEAD(&key->list); 416 417 return key; 418 } 419 420 static void __ieee80211_key_destroy(struct ieee80211_key *key) 421 { 422 if (!key) 423 return; 424 425 /* 426 * Synchronize so the TX path can no longer be using 427 * this key before we free/remove it. 428 */ 429 synchronize_rcu(); 430 431 if (key->local) 432 ieee80211_key_disable_hw_accel(key); 433 434 if (key->conf.cipher == WLAN_CIPHER_SUITE_CCMP) 435 ieee80211_aes_key_free(key->u.ccmp.tfm); 436 if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC) 437 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); 438 if (key->local) { 439 ieee80211_debugfs_key_remove(key); 440 key->sdata->crypto_tx_tailroom_needed_cnt--; 441 } 442 443 kfree(key); 444 } 445 446 int ieee80211_key_link(struct ieee80211_key *key, 447 struct ieee80211_sub_if_data *sdata, 448 struct sta_info *sta) 449 { 450 struct ieee80211_key *old_key; 451 int idx, ret; 452 bool pairwise; 453 454 BUG_ON(!sdata); 455 BUG_ON(!key); 456 457 pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE; 458 idx = key->conf.keyidx; 459 key->local = sdata->local; 460 key->sdata = sdata; 461 key->sta = sta; 462 463 if (sta) { 464 /* 465 * some hardware cannot handle TKIP with QoS, so 466 * we indicate whether QoS could be in use. 467 */ 468 if (test_sta_flag(sta, WLAN_STA_WME)) 469 key->conf.flags |= IEEE80211_KEY_FLAG_WMM_STA; 470 } else { 471 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 472 struct sta_info *ap; 473 474 /* 475 * We're getting a sta pointer in, so must be under 476 * appropriate locking for sta_info_get(). 477 */ 478 479 /* same here, the AP could be using QoS */ 480 ap = sta_info_get(key->sdata, key->sdata->u.mgd.bssid); 481 if (ap) { 482 if (test_sta_flag(ap, WLAN_STA_WME)) 483 key->conf.flags |= 484 IEEE80211_KEY_FLAG_WMM_STA; 485 } 486 } 487 } 488 489 mutex_lock(&sdata->local->key_mtx); 490 491 if (sta && pairwise) 492 old_key = key_mtx_dereference(sdata->local, sta->ptk); 493 else if (sta) 494 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]); 495 else 496 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]); 497 498 increment_tailroom_need_count(sdata); 499 500 __ieee80211_key_replace(sdata, sta, pairwise, old_key, key); 501 __ieee80211_key_destroy(old_key); 502 503 ieee80211_debugfs_key_add(key); 504 505 ret = ieee80211_key_enable_hw_accel(key); 506 507 mutex_unlock(&sdata->local->key_mtx); 508 509 return ret; 510 } 511 512 void __ieee80211_key_free(struct ieee80211_key *key) 513 { 514 if (!key) 515 return; 516 517 /* 518 * Replace key with nothingness if it was ever used. 519 */ 520 if (key->sdata) 521 __ieee80211_key_replace(key->sdata, key->sta, 522 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 523 key, NULL); 524 __ieee80211_key_destroy(key); 525 } 526 527 void ieee80211_key_free(struct ieee80211_local *local, 528 struct ieee80211_key *key) 529 { 530 mutex_lock(&local->key_mtx); 531 __ieee80211_key_free(key); 532 mutex_unlock(&local->key_mtx); 533 } 534 535 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata) 536 { 537 struct ieee80211_key *key; 538 539 ASSERT_RTNL(); 540 541 if (WARN_ON(!ieee80211_sdata_running(sdata))) 542 return; 543 544 mutex_lock(&sdata->local->key_mtx); 545 546 sdata->crypto_tx_tailroom_needed_cnt = 0; 547 548 list_for_each_entry(key, &sdata->key_list, list) { 549 increment_tailroom_need_count(sdata); 550 ieee80211_key_enable_hw_accel(key); 551 } 552 553 mutex_unlock(&sdata->local->key_mtx); 554 } 555 556 void ieee80211_iter_keys(struct ieee80211_hw *hw, 557 struct ieee80211_vif *vif, 558 void (*iter)(struct ieee80211_hw *hw, 559 struct ieee80211_vif *vif, 560 struct ieee80211_sta *sta, 561 struct ieee80211_key_conf *key, 562 void *data), 563 void *iter_data) 564 { 565 struct ieee80211_local *local = hw_to_local(hw); 566 struct ieee80211_key *key; 567 struct ieee80211_sub_if_data *sdata; 568 569 ASSERT_RTNL(); 570 571 mutex_lock(&local->key_mtx); 572 if (vif) { 573 sdata = vif_to_sdata(vif); 574 list_for_each_entry(key, &sdata->key_list, list) 575 iter(hw, &sdata->vif, 576 key->sta ? &key->sta->sta : NULL, 577 &key->conf, iter_data); 578 } else { 579 list_for_each_entry(sdata, &local->interfaces, list) 580 list_for_each_entry(key, &sdata->key_list, list) 581 iter(hw, &sdata->vif, 582 key->sta ? &key->sta->sta : NULL, 583 &key->conf, iter_data); 584 } 585 mutex_unlock(&local->key_mtx); 586 } 587 EXPORT_SYMBOL(ieee80211_iter_keys); 588 589 void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata) 590 { 591 struct ieee80211_key *key; 592 593 ASSERT_RTNL(); 594 595 mutex_lock(&sdata->local->key_mtx); 596 597 list_for_each_entry(key, &sdata->key_list, list) 598 ieee80211_key_disable_hw_accel(key); 599 600 mutex_unlock(&sdata->local->key_mtx); 601 } 602 603 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata) 604 { 605 struct ieee80211_key *key, *tmp; 606 607 mutex_lock(&sdata->local->key_mtx); 608 609 ieee80211_debugfs_key_remove_mgmt_default(sdata); 610 611 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) 612 __ieee80211_key_free(key); 613 614 ieee80211_debugfs_key_update_default(sdata); 615 616 mutex_unlock(&sdata->local->key_mtx); 617 } 618 619 620 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid, 621 const u8 *replay_ctr, gfp_t gfp) 622 { 623 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 624 625 trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr); 626 627 cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp); 628 } 629 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify); 630 631 void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf, 632 struct ieee80211_key_seq *seq) 633 { 634 struct ieee80211_key *key; 635 u64 pn64; 636 637 if (WARN_ON(!(keyconf->flags & IEEE80211_KEY_FLAG_GENERATE_IV))) 638 return; 639 640 key = container_of(keyconf, struct ieee80211_key, conf); 641 642 switch (key->conf.cipher) { 643 case WLAN_CIPHER_SUITE_TKIP: 644 seq->tkip.iv32 = key->u.tkip.tx.iv32; 645 seq->tkip.iv16 = key->u.tkip.tx.iv16; 646 break; 647 case WLAN_CIPHER_SUITE_CCMP: 648 pn64 = atomic64_read(&key->u.ccmp.tx_pn); 649 seq->ccmp.pn[5] = pn64; 650 seq->ccmp.pn[4] = pn64 >> 8; 651 seq->ccmp.pn[3] = pn64 >> 16; 652 seq->ccmp.pn[2] = pn64 >> 24; 653 seq->ccmp.pn[1] = pn64 >> 32; 654 seq->ccmp.pn[0] = pn64 >> 40; 655 break; 656 case WLAN_CIPHER_SUITE_AES_CMAC: 657 pn64 = atomic64_read(&key->u.aes_cmac.tx_pn); 658 seq->ccmp.pn[5] = pn64; 659 seq->ccmp.pn[4] = pn64 >> 8; 660 seq->ccmp.pn[3] = pn64 >> 16; 661 seq->ccmp.pn[2] = pn64 >> 24; 662 seq->ccmp.pn[1] = pn64 >> 32; 663 seq->ccmp.pn[0] = pn64 >> 40; 664 break; 665 default: 666 WARN_ON(1); 667 } 668 } 669 EXPORT_SYMBOL(ieee80211_get_key_tx_seq); 670 671 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf, 672 int tid, struct ieee80211_key_seq *seq) 673 { 674 struct ieee80211_key *key; 675 const u8 *pn; 676 677 key = container_of(keyconf, struct ieee80211_key, conf); 678 679 switch (key->conf.cipher) { 680 case WLAN_CIPHER_SUITE_TKIP: 681 if (WARN_ON(tid < 0 || tid >= NUM_RX_DATA_QUEUES)) 682 return; 683 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32; 684 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16; 685 break; 686 case WLAN_CIPHER_SUITE_CCMP: 687 if (WARN_ON(tid < -1 || tid >= NUM_RX_DATA_QUEUES)) 688 return; 689 if (tid < 0) 690 pn = key->u.ccmp.rx_pn[NUM_RX_DATA_QUEUES]; 691 else 692 pn = key->u.ccmp.rx_pn[tid]; 693 memcpy(seq->ccmp.pn, pn, CCMP_PN_LEN); 694 break; 695 case WLAN_CIPHER_SUITE_AES_CMAC: 696 if (WARN_ON(tid != 0)) 697 return; 698 pn = key->u.aes_cmac.rx_pn; 699 memcpy(seq->aes_cmac.pn, pn, CMAC_PN_LEN); 700 break; 701 } 702 } 703 EXPORT_SYMBOL(ieee80211_get_key_rx_seq); 704