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_destroy(struct ieee80211_key *key, 401 bool delay_tailroom) 402 { 403 if (!key) 404 return; 405 406 /* 407 * Synchronize so the TX path can no longer be using 408 * this key before we free/remove it. 409 */ 410 synchronize_net(); 411 412 if (key->local) 413 ieee80211_key_disable_hw_accel(key); 414 415 if (key->conf.cipher == WLAN_CIPHER_SUITE_CCMP) 416 ieee80211_aes_key_free(key->u.ccmp.tfm); 417 if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC) 418 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); 419 if (key->local) { 420 struct ieee80211_sub_if_data *sdata = key->sdata; 421 422 ieee80211_debugfs_key_remove(key); 423 424 if (delay_tailroom) { 425 /* see ieee80211_delayed_tailroom_dec */ 426 sdata->crypto_tx_tailroom_pending_dec++; 427 schedule_delayed_work(&sdata->dec_tailroom_needed_wk, 428 HZ/2); 429 } else { 430 sdata->crypto_tx_tailroom_needed_cnt--; 431 } 432 } 433 434 kfree(key); 435 } 436 437 int ieee80211_key_link(struct ieee80211_key *key, 438 struct ieee80211_sub_if_data *sdata, 439 struct sta_info *sta) 440 { 441 struct ieee80211_key *old_key; 442 int idx, ret; 443 bool pairwise; 444 445 BUG_ON(!sdata); 446 BUG_ON(!key); 447 448 pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE; 449 idx = key->conf.keyidx; 450 key->local = sdata->local; 451 key->sdata = sdata; 452 key->sta = sta; 453 454 mutex_lock(&sdata->local->key_mtx); 455 456 if (sta && pairwise) 457 old_key = key_mtx_dereference(sdata->local, sta->ptk); 458 else if (sta) 459 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]); 460 else 461 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]); 462 463 increment_tailroom_need_count(sdata); 464 465 __ieee80211_key_replace(sdata, sta, pairwise, old_key, key); 466 __ieee80211_key_destroy(old_key, true); 467 468 ieee80211_debugfs_key_add(key); 469 470 ret = ieee80211_key_enable_hw_accel(key); 471 472 mutex_unlock(&sdata->local->key_mtx); 473 474 return ret; 475 } 476 477 void __ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom) 478 { 479 if (!key) 480 return; 481 482 /* 483 * Replace key with nothingness if it was ever used. 484 */ 485 if (key->sdata) 486 __ieee80211_key_replace(key->sdata, key->sta, 487 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 488 key, NULL); 489 __ieee80211_key_destroy(key, delay_tailroom); 490 } 491 492 void ieee80211_key_free(struct ieee80211_local *local, 493 struct ieee80211_key *key) 494 { 495 mutex_lock(&local->key_mtx); 496 __ieee80211_key_free(key, true); 497 mutex_unlock(&local->key_mtx); 498 } 499 500 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata) 501 { 502 struct ieee80211_key *key; 503 504 ASSERT_RTNL(); 505 506 if (WARN_ON(!ieee80211_sdata_running(sdata))) 507 return; 508 509 mutex_lock(&sdata->local->key_mtx); 510 511 sdata->crypto_tx_tailroom_needed_cnt = 0; 512 513 list_for_each_entry(key, &sdata->key_list, list) { 514 increment_tailroom_need_count(sdata); 515 ieee80211_key_enable_hw_accel(key); 516 } 517 518 mutex_unlock(&sdata->local->key_mtx); 519 } 520 521 void ieee80211_iter_keys(struct ieee80211_hw *hw, 522 struct ieee80211_vif *vif, 523 void (*iter)(struct ieee80211_hw *hw, 524 struct ieee80211_vif *vif, 525 struct ieee80211_sta *sta, 526 struct ieee80211_key_conf *key, 527 void *data), 528 void *iter_data) 529 { 530 struct ieee80211_local *local = hw_to_local(hw); 531 struct ieee80211_key *key; 532 struct ieee80211_sub_if_data *sdata; 533 534 ASSERT_RTNL(); 535 536 mutex_lock(&local->key_mtx); 537 if (vif) { 538 sdata = vif_to_sdata(vif); 539 list_for_each_entry(key, &sdata->key_list, list) 540 iter(hw, &sdata->vif, 541 key->sta ? &key->sta->sta : NULL, 542 &key->conf, iter_data); 543 } else { 544 list_for_each_entry(sdata, &local->interfaces, list) 545 list_for_each_entry(key, &sdata->key_list, list) 546 iter(hw, &sdata->vif, 547 key->sta ? &key->sta->sta : NULL, 548 &key->conf, iter_data); 549 } 550 mutex_unlock(&local->key_mtx); 551 } 552 EXPORT_SYMBOL(ieee80211_iter_keys); 553 554 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata) 555 { 556 struct ieee80211_key *key, *tmp; 557 558 cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk); 559 560 mutex_lock(&sdata->local->key_mtx); 561 562 sdata->crypto_tx_tailroom_needed_cnt -= 563 sdata->crypto_tx_tailroom_pending_dec; 564 sdata->crypto_tx_tailroom_pending_dec = 0; 565 566 ieee80211_debugfs_key_remove_mgmt_default(sdata); 567 568 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) 569 __ieee80211_key_free(key, false); 570 571 ieee80211_debugfs_key_update_default(sdata); 572 573 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || 574 sdata->crypto_tx_tailroom_pending_dec); 575 576 mutex_unlock(&sdata->local->key_mtx); 577 } 578 579 void ieee80211_delayed_tailroom_dec(struct work_struct *wk) 580 { 581 struct ieee80211_sub_if_data *sdata; 582 583 sdata = container_of(wk, struct ieee80211_sub_if_data, 584 dec_tailroom_needed_wk.work); 585 586 /* 587 * The reason for the delayed tailroom needed decrementing is to 588 * make roaming faster: during roaming, all keys are first deleted 589 * and then new keys are installed. The first new key causes the 590 * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes 591 * the cost of synchronize_net() (which can be slow). Avoid this 592 * by deferring the crypto_tx_tailroom_needed_cnt decrementing on 593 * key removal for a while, so if we roam the value is larger than 594 * zero and no 0->1 transition happens. 595 * 596 * The cost is that if the AP switching was from an AP with keys 597 * to one without, we still allocate tailroom while it would no 598 * longer be needed. However, in the typical (fast) roaming case 599 * within an ESS this usually won't happen. 600 */ 601 602 mutex_lock(&sdata->local->key_mtx); 603 sdata->crypto_tx_tailroom_needed_cnt -= 604 sdata->crypto_tx_tailroom_pending_dec; 605 sdata->crypto_tx_tailroom_pending_dec = 0; 606 mutex_unlock(&sdata->local->key_mtx); 607 } 608 609 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid, 610 const u8 *replay_ctr, gfp_t gfp) 611 { 612 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 613 614 trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr); 615 616 cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp); 617 } 618 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify); 619 620 void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf, 621 struct ieee80211_key_seq *seq) 622 { 623 struct ieee80211_key *key; 624 u64 pn64; 625 626 if (WARN_ON(!(keyconf->flags & IEEE80211_KEY_FLAG_GENERATE_IV))) 627 return; 628 629 key = container_of(keyconf, struct ieee80211_key, conf); 630 631 switch (key->conf.cipher) { 632 case WLAN_CIPHER_SUITE_TKIP: 633 seq->tkip.iv32 = key->u.tkip.tx.iv32; 634 seq->tkip.iv16 = key->u.tkip.tx.iv16; 635 break; 636 case WLAN_CIPHER_SUITE_CCMP: 637 pn64 = atomic64_read(&key->u.ccmp.tx_pn); 638 seq->ccmp.pn[5] = pn64; 639 seq->ccmp.pn[4] = pn64 >> 8; 640 seq->ccmp.pn[3] = pn64 >> 16; 641 seq->ccmp.pn[2] = pn64 >> 24; 642 seq->ccmp.pn[1] = pn64 >> 32; 643 seq->ccmp.pn[0] = pn64 >> 40; 644 break; 645 case WLAN_CIPHER_SUITE_AES_CMAC: 646 pn64 = atomic64_read(&key->u.aes_cmac.tx_pn); 647 seq->ccmp.pn[5] = pn64; 648 seq->ccmp.pn[4] = pn64 >> 8; 649 seq->ccmp.pn[3] = pn64 >> 16; 650 seq->ccmp.pn[2] = pn64 >> 24; 651 seq->ccmp.pn[1] = pn64 >> 32; 652 seq->ccmp.pn[0] = pn64 >> 40; 653 break; 654 default: 655 WARN_ON(1); 656 } 657 } 658 EXPORT_SYMBOL(ieee80211_get_key_tx_seq); 659 660 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf, 661 int tid, struct ieee80211_key_seq *seq) 662 { 663 struct ieee80211_key *key; 664 const u8 *pn; 665 666 key = container_of(keyconf, struct ieee80211_key, conf); 667 668 switch (key->conf.cipher) { 669 case WLAN_CIPHER_SUITE_TKIP: 670 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) 671 return; 672 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32; 673 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16; 674 break; 675 case WLAN_CIPHER_SUITE_CCMP: 676 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 677 return; 678 if (tid < 0) 679 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; 680 else 681 pn = key->u.ccmp.rx_pn[tid]; 682 memcpy(seq->ccmp.pn, pn, CCMP_PN_LEN); 683 break; 684 case WLAN_CIPHER_SUITE_AES_CMAC: 685 if (WARN_ON(tid != 0)) 686 return; 687 pn = key->u.aes_cmac.rx_pn; 688 memcpy(seq->aes_cmac.pn, pn, CMAC_PN_LEN); 689 break; 690 } 691 } 692 EXPORT_SYMBOL(ieee80211_get_key_rx_seq); 693