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 * Copyright 2013-2014 Intel Mobile Communications GmbH 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 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 54 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; 55 56 static void assert_key_lock(struct ieee80211_local *local) 57 { 58 lockdep_assert_held(&local->key_mtx); 59 } 60 61 static void 62 update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta) 63 { 64 struct ieee80211_sub_if_data *vlan; 65 66 if (sdata->vif.type != NL80211_IFTYPE_AP) 67 return; 68 69 /* crypto_tx_tailroom_needed_cnt is protected by this */ 70 assert_key_lock(sdata->local); 71 72 rcu_read_lock(); 73 74 list_for_each_entry_rcu(vlan, &sdata->u.ap.vlans, u.vlan.list) 75 vlan->crypto_tx_tailroom_needed_cnt += delta; 76 77 rcu_read_unlock(); 78 } 79 80 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata) 81 { 82 /* 83 * When this count is zero, SKB resizing for allocating tailroom 84 * for IV or MMIC is skipped. But, this check has created two race 85 * cases in xmit path while transiting from zero count to one: 86 * 87 * 1. SKB resize was skipped because no key was added but just before 88 * the xmit key is added and SW encryption kicks off. 89 * 90 * 2. SKB resize was skipped because all the keys were hw planted but 91 * just before xmit one of the key is deleted and SW encryption kicks 92 * off. 93 * 94 * In both the above case SW encryption will find not enough space for 95 * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c) 96 * 97 * Solution has been explained at 98 * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net 99 */ 100 101 assert_key_lock(sdata->local); 102 103 update_vlan_tailroom_need_count(sdata, 1); 104 105 if (!sdata->crypto_tx_tailroom_needed_cnt++) { 106 /* 107 * Flush all XMIT packets currently using HW encryption or no 108 * encryption at all if the count transition is from 0 -> 1. 109 */ 110 synchronize_net(); 111 } 112 } 113 114 static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata, 115 int delta) 116 { 117 assert_key_lock(sdata->local); 118 119 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta); 120 121 update_vlan_tailroom_need_count(sdata, -delta); 122 sdata->crypto_tx_tailroom_needed_cnt -= delta; 123 } 124 125 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key) 126 { 127 struct ieee80211_sub_if_data *sdata; 128 struct sta_info *sta; 129 int ret = -EOPNOTSUPP; 130 131 might_sleep(); 132 133 if (key->flags & KEY_FLAG_TAINTED) { 134 /* If we get here, it's during resume and the key is 135 * tainted so shouldn't be used/programmed any more. 136 * However, its flags may still indicate that it was 137 * programmed into the device (since we're in resume) 138 * so clear that flag now to avoid trying to remove 139 * it again later. 140 */ 141 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; 142 return -EINVAL; 143 } 144 145 if (!key->local->ops->set_key) 146 goto out_unsupported; 147 148 assert_key_lock(key->local); 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 sdata = key->sdata; 164 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 165 /* 166 * The driver doesn't know anything about VLAN interfaces. 167 * Hence, don't send GTKs for VLAN interfaces to the driver. 168 */ 169 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) 170 goto out_unsupported; 171 } 172 173 ret = drv_set_key(key->local, SET_KEY, sdata, 174 sta ? &sta->sta : NULL, &key->conf); 175 176 if (!ret) { 177 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; 178 179 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || 180 (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) 181 decrease_tailroom_need_count(sdata, 1); 182 183 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && 184 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)); 185 186 return 0; 187 } 188 189 if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1) 190 sdata_err(sdata, 191 "failed to set key (%d, %pM) to hardware (%d)\n", 192 key->conf.keyidx, 193 sta ? sta->sta.addr : bcast_addr, ret); 194 195 out_unsupported: 196 switch (key->conf.cipher) { 197 case WLAN_CIPHER_SUITE_WEP40: 198 case WLAN_CIPHER_SUITE_WEP104: 199 case WLAN_CIPHER_SUITE_TKIP: 200 case WLAN_CIPHER_SUITE_CCMP: 201 case WLAN_CIPHER_SUITE_CCMP_256: 202 case WLAN_CIPHER_SUITE_AES_CMAC: 203 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 204 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 205 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 206 case WLAN_CIPHER_SUITE_GCMP: 207 case WLAN_CIPHER_SUITE_GCMP_256: 208 /* all of these we can do in software - if driver can */ 209 if (ret == 1) 210 return 0; 211 if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL)) 212 return -EINVAL; 213 return 0; 214 default: 215 return -EINVAL; 216 } 217 } 218 219 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key) 220 { 221 struct ieee80211_sub_if_data *sdata; 222 struct sta_info *sta; 223 int ret; 224 225 might_sleep(); 226 227 if (!key || !key->local->ops->set_key) 228 return; 229 230 assert_key_lock(key->local); 231 232 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 233 return; 234 235 sta = key->sta; 236 sdata = key->sdata; 237 238 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || 239 (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) 240 increment_tailroom_need_count(sdata); 241 242 ret = drv_set_key(key->local, DISABLE_KEY, sdata, 243 sta ? &sta->sta : NULL, &key->conf); 244 245 if (ret) 246 sdata_err(sdata, 247 "failed to remove key (%d, %pM) from hardware (%d)\n", 248 key->conf.keyidx, 249 sta ? sta->sta.addr : bcast_addr, ret); 250 251 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; 252 } 253 254 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, 255 int idx, bool uni, bool multi) 256 { 257 struct ieee80211_key *key = NULL; 258 259 assert_key_lock(sdata->local); 260 261 if (idx >= 0 && idx < NUM_DEFAULT_KEYS) 262 key = key_mtx_dereference(sdata->local, sdata->keys[idx]); 263 264 if (uni) { 265 rcu_assign_pointer(sdata->default_unicast_key, key); 266 ieee80211_check_fast_xmit_iface(sdata); 267 drv_set_default_unicast_key(sdata->local, sdata, idx); 268 } 269 270 if (multi) 271 rcu_assign_pointer(sdata->default_multicast_key, key); 272 273 ieee80211_debugfs_key_update_default(sdata); 274 } 275 276 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx, 277 bool uni, bool multi) 278 { 279 mutex_lock(&sdata->local->key_mtx); 280 __ieee80211_set_default_key(sdata, idx, uni, multi); 281 mutex_unlock(&sdata->local->key_mtx); 282 } 283 284 static void 285 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx) 286 { 287 struct ieee80211_key *key = NULL; 288 289 assert_key_lock(sdata->local); 290 291 if (idx >= NUM_DEFAULT_KEYS && 292 idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) 293 key = key_mtx_dereference(sdata->local, sdata->keys[idx]); 294 295 rcu_assign_pointer(sdata->default_mgmt_key, key); 296 297 ieee80211_debugfs_key_update_default(sdata); 298 } 299 300 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, 301 int idx) 302 { 303 mutex_lock(&sdata->local->key_mtx); 304 __ieee80211_set_default_mgmt_key(sdata, idx); 305 mutex_unlock(&sdata->local->key_mtx); 306 } 307 308 309 static void ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, 310 struct sta_info *sta, 311 bool pairwise, 312 struct ieee80211_key *old, 313 struct ieee80211_key *new) 314 { 315 int idx; 316 bool defunikey, defmultikey, defmgmtkey; 317 318 /* caller must provide at least one old/new */ 319 if (WARN_ON(!new && !old)) 320 return; 321 322 if (new) 323 list_add_tail(&new->list, &sdata->key_list); 324 325 WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx); 326 327 if (old) 328 idx = old->conf.keyidx; 329 else 330 idx = new->conf.keyidx; 331 332 if (sta) { 333 if (pairwise) { 334 rcu_assign_pointer(sta->ptk[idx], new); 335 sta->ptk_idx = idx; 336 ieee80211_check_fast_xmit(sta); 337 } else { 338 rcu_assign_pointer(sta->gtk[idx], new); 339 sta->gtk_idx = idx; 340 } 341 } else { 342 defunikey = old && 343 old == key_mtx_dereference(sdata->local, 344 sdata->default_unicast_key); 345 defmultikey = old && 346 old == key_mtx_dereference(sdata->local, 347 sdata->default_multicast_key); 348 defmgmtkey = old && 349 old == key_mtx_dereference(sdata->local, 350 sdata->default_mgmt_key); 351 352 if (defunikey && !new) 353 __ieee80211_set_default_key(sdata, -1, true, false); 354 if (defmultikey && !new) 355 __ieee80211_set_default_key(sdata, -1, false, true); 356 if (defmgmtkey && !new) 357 __ieee80211_set_default_mgmt_key(sdata, -1); 358 359 rcu_assign_pointer(sdata->keys[idx], new); 360 if (defunikey && new) 361 __ieee80211_set_default_key(sdata, new->conf.keyidx, 362 true, false); 363 if (defmultikey && new) 364 __ieee80211_set_default_key(sdata, new->conf.keyidx, 365 false, true); 366 if (defmgmtkey && new) 367 __ieee80211_set_default_mgmt_key(sdata, 368 new->conf.keyidx); 369 } 370 371 if (old) 372 list_del(&old->list); 373 } 374 375 struct ieee80211_key * 376 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, 377 const u8 *key_data, 378 size_t seq_len, const u8 *seq, 379 const struct ieee80211_cipher_scheme *cs) 380 { 381 struct ieee80211_key *key; 382 int i, j, err; 383 384 if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)) 385 return ERR_PTR(-EINVAL); 386 387 key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); 388 if (!key) 389 return ERR_PTR(-ENOMEM); 390 391 /* 392 * Default to software encryption; we'll later upload the 393 * key to the hardware if possible. 394 */ 395 key->conf.flags = 0; 396 key->flags = 0; 397 398 key->conf.cipher = cipher; 399 key->conf.keyidx = idx; 400 key->conf.keylen = key_len; 401 switch (cipher) { 402 case WLAN_CIPHER_SUITE_WEP40: 403 case WLAN_CIPHER_SUITE_WEP104: 404 key->conf.iv_len = IEEE80211_WEP_IV_LEN; 405 key->conf.icv_len = IEEE80211_WEP_ICV_LEN; 406 break; 407 case WLAN_CIPHER_SUITE_TKIP: 408 key->conf.iv_len = IEEE80211_TKIP_IV_LEN; 409 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN; 410 if (seq) { 411 for (i = 0; i < IEEE80211_NUM_TIDS; i++) { 412 key->u.tkip.rx[i].iv32 = 413 get_unaligned_le32(&seq[2]); 414 key->u.tkip.rx[i].iv16 = 415 get_unaligned_le16(seq); 416 } 417 } 418 spin_lock_init(&key->u.tkip.txlock); 419 break; 420 case WLAN_CIPHER_SUITE_CCMP: 421 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN; 422 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN; 423 if (seq) { 424 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) 425 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++) 426 key->u.ccmp.rx_pn[i][j] = 427 seq[IEEE80211_CCMP_PN_LEN - j - 1]; 428 } 429 /* 430 * Initialize AES key state here as an optimization so that 431 * it does not need to be initialized for every packet. 432 */ 433 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt( 434 key_data, key_len, IEEE80211_CCMP_MIC_LEN); 435 if (IS_ERR(key->u.ccmp.tfm)) { 436 err = PTR_ERR(key->u.ccmp.tfm); 437 kfree(key); 438 return ERR_PTR(err); 439 } 440 break; 441 case WLAN_CIPHER_SUITE_CCMP_256: 442 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN; 443 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN; 444 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++) 445 for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++) 446 key->u.ccmp.rx_pn[i][j] = 447 seq[IEEE80211_CCMP_256_PN_LEN - j - 1]; 448 /* Initialize AES key state here as an optimization so that 449 * it does not need to be initialized for every packet. 450 */ 451 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt( 452 key_data, key_len, IEEE80211_CCMP_256_MIC_LEN); 453 if (IS_ERR(key->u.ccmp.tfm)) { 454 err = PTR_ERR(key->u.ccmp.tfm); 455 kfree(key); 456 return ERR_PTR(err); 457 } 458 break; 459 case WLAN_CIPHER_SUITE_AES_CMAC: 460 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 461 key->conf.iv_len = 0; 462 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC) 463 key->conf.icv_len = sizeof(struct ieee80211_mmie); 464 else 465 key->conf.icv_len = sizeof(struct ieee80211_mmie_16); 466 if (seq) 467 for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++) 468 key->u.aes_cmac.rx_pn[j] = 469 seq[IEEE80211_CMAC_PN_LEN - j - 1]; 470 /* 471 * Initialize AES key state here as an optimization so that 472 * it does not need to be initialized for every packet. 473 */ 474 key->u.aes_cmac.tfm = 475 ieee80211_aes_cmac_key_setup(key_data, key_len); 476 if (IS_ERR(key->u.aes_cmac.tfm)) { 477 err = PTR_ERR(key->u.aes_cmac.tfm); 478 kfree(key); 479 return ERR_PTR(err); 480 } 481 break; 482 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 483 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 484 key->conf.iv_len = 0; 485 key->conf.icv_len = sizeof(struct ieee80211_mmie_16); 486 if (seq) 487 for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++) 488 key->u.aes_gmac.rx_pn[j] = 489 seq[IEEE80211_GMAC_PN_LEN - j - 1]; 490 /* Initialize AES key state here as an optimization so that 491 * it does not need to be initialized for every packet. 492 */ 493 key->u.aes_gmac.tfm = 494 ieee80211_aes_gmac_key_setup(key_data, key_len); 495 if (IS_ERR(key->u.aes_gmac.tfm)) { 496 err = PTR_ERR(key->u.aes_gmac.tfm); 497 kfree(key); 498 return ERR_PTR(err); 499 } 500 break; 501 case WLAN_CIPHER_SUITE_GCMP: 502 case WLAN_CIPHER_SUITE_GCMP_256: 503 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN; 504 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN; 505 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++) 506 for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++) 507 key->u.gcmp.rx_pn[i][j] = 508 seq[IEEE80211_GCMP_PN_LEN - j - 1]; 509 /* Initialize AES key state here as an optimization so that 510 * it does not need to be initialized for every packet. 511 */ 512 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data, 513 key_len); 514 if (IS_ERR(key->u.gcmp.tfm)) { 515 err = PTR_ERR(key->u.gcmp.tfm); 516 kfree(key); 517 return ERR_PTR(err); 518 } 519 break; 520 default: 521 if (cs) { 522 if (seq_len && seq_len != cs->pn_len) { 523 kfree(key); 524 return ERR_PTR(-EINVAL); 525 } 526 527 key->conf.iv_len = cs->hdr_len; 528 key->conf.icv_len = cs->mic_len; 529 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) 530 for (j = 0; j < seq_len; j++) 531 key->u.gen.rx_pn[i][j] = 532 seq[seq_len - j - 1]; 533 key->flags |= KEY_FLAG_CIPHER_SCHEME; 534 } 535 } 536 memcpy(key->conf.key, key_data, key_len); 537 INIT_LIST_HEAD(&key->list); 538 539 return key; 540 } 541 542 static void ieee80211_key_free_common(struct ieee80211_key *key) 543 { 544 switch (key->conf.cipher) { 545 case WLAN_CIPHER_SUITE_CCMP: 546 case WLAN_CIPHER_SUITE_CCMP_256: 547 ieee80211_aes_key_free(key->u.ccmp.tfm); 548 break; 549 case WLAN_CIPHER_SUITE_AES_CMAC: 550 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 551 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); 552 break; 553 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 554 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 555 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm); 556 break; 557 case WLAN_CIPHER_SUITE_GCMP: 558 case WLAN_CIPHER_SUITE_GCMP_256: 559 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm); 560 break; 561 } 562 kzfree(key); 563 } 564 565 static void __ieee80211_key_destroy(struct ieee80211_key *key, 566 bool delay_tailroom) 567 { 568 if (key->local) 569 ieee80211_key_disable_hw_accel(key); 570 571 if (key->local) { 572 struct ieee80211_sub_if_data *sdata = key->sdata; 573 574 ieee80211_debugfs_key_remove(key); 575 576 if (delay_tailroom) { 577 /* see ieee80211_delayed_tailroom_dec */ 578 sdata->crypto_tx_tailroom_pending_dec++; 579 schedule_delayed_work(&sdata->dec_tailroom_needed_wk, 580 HZ/2); 581 } else { 582 decrease_tailroom_need_count(sdata, 1); 583 } 584 } 585 586 ieee80211_key_free_common(key); 587 } 588 589 static void ieee80211_key_destroy(struct ieee80211_key *key, 590 bool delay_tailroom) 591 { 592 if (!key) 593 return; 594 595 /* 596 * Synchronize so the TX path can no longer be using 597 * this key before we free/remove it. 598 */ 599 synchronize_net(); 600 601 __ieee80211_key_destroy(key, delay_tailroom); 602 } 603 604 void ieee80211_key_free_unused(struct ieee80211_key *key) 605 { 606 WARN_ON(key->sdata || key->local); 607 ieee80211_key_free_common(key); 608 } 609 610 int ieee80211_key_link(struct ieee80211_key *key, 611 struct ieee80211_sub_if_data *sdata, 612 struct sta_info *sta) 613 { 614 struct ieee80211_local *local = sdata->local; 615 struct ieee80211_key *old_key; 616 int idx, ret; 617 bool pairwise; 618 619 pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE; 620 idx = key->conf.keyidx; 621 key->local = sdata->local; 622 key->sdata = sdata; 623 key->sta = sta; 624 625 mutex_lock(&sdata->local->key_mtx); 626 627 if (sta && pairwise) 628 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]); 629 else if (sta) 630 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]); 631 else 632 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]); 633 634 increment_tailroom_need_count(sdata); 635 636 ieee80211_key_replace(sdata, sta, pairwise, old_key, key); 637 ieee80211_key_destroy(old_key, true); 638 639 ieee80211_debugfs_key_add(key); 640 641 if (!local->wowlan) { 642 ret = ieee80211_key_enable_hw_accel(key); 643 if (ret) 644 ieee80211_key_free(key, true); 645 } else { 646 ret = 0; 647 } 648 649 mutex_unlock(&sdata->local->key_mtx); 650 651 return ret; 652 } 653 654 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom) 655 { 656 if (!key) 657 return; 658 659 /* 660 * Replace key with nothingness if it was ever used. 661 */ 662 if (key->sdata) 663 ieee80211_key_replace(key->sdata, key->sta, 664 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 665 key, NULL); 666 ieee80211_key_destroy(key, delay_tailroom); 667 } 668 669 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata) 670 { 671 struct ieee80211_key *key; 672 struct ieee80211_sub_if_data *vlan; 673 674 ASSERT_RTNL(); 675 676 if (WARN_ON(!ieee80211_sdata_running(sdata))) 677 return; 678 679 mutex_lock(&sdata->local->key_mtx); 680 681 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || 682 sdata->crypto_tx_tailroom_pending_dec); 683 684 if (sdata->vif.type == NL80211_IFTYPE_AP) { 685 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 686 WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt || 687 vlan->crypto_tx_tailroom_pending_dec); 688 } 689 690 list_for_each_entry(key, &sdata->key_list, list) { 691 increment_tailroom_need_count(sdata); 692 ieee80211_key_enable_hw_accel(key); 693 } 694 695 mutex_unlock(&sdata->local->key_mtx); 696 } 697 698 void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata) 699 { 700 struct ieee80211_sub_if_data *vlan; 701 702 mutex_lock(&sdata->local->key_mtx); 703 704 sdata->crypto_tx_tailroom_needed_cnt = 0; 705 706 if (sdata->vif.type == NL80211_IFTYPE_AP) { 707 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 708 vlan->crypto_tx_tailroom_needed_cnt = 0; 709 } 710 711 mutex_unlock(&sdata->local->key_mtx); 712 } 713 714 void ieee80211_iter_keys(struct ieee80211_hw *hw, 715 struct ieee80211_vif *vif, 716 void (*iter)(struct ieee80211_hw *hw, 717 struct ieee80211_vif *vif, 718 struct ieee80211_sta *sta, 719 struct ieee80211_key_conf *key, 720 void *data), 721 void *iter_data) 722 { 723 struct ieee80211_local *local = hw_to_local(hw); 724 struct ieee80211_key *key, *tmp; 725 struct ieee80211_sub_if_data *sdata; 726 727 ASSERT_RTNL(); 728 729 mutex_lock(&local->key_mtx); 730 if (vif) { 731 sdata = vif_to_sdata(vif); 732 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) 733 iter(hw, &sdata->vif, 734 key->sta ? &key->sta->sta : NULL, 735 &key->conf, iter_data); 736 } else { 737 list_for_each_entry(sdata, &local->interfaces, list) 738 list_for_each_entry_safe(key, tmp, 739 &sdata->key_list, list) 740 iter(hw, &sdata->vif, 741 key->sta ? &key->sta->sta : NULL, 742 &key->conf, iter_data); 743 } 744 mutex_unlock(&local->key_mtx); 745 } 746 EXPORT_SYMBOL(ieee80211_iter_keys); 747 748 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata, 749 struct list_head *keys) 750 { 751 struct ieee80211_key *key, *tmp; 752 753 decrease_tailroom_need_count(sdata, 754 sdata->crypto_tx_tailroom_pending_dec); 755 sdata->crypto_tx_tailroom_pending_dec = 0; 756 757 ieee80211_debugfs_key_remove_mgmt_default(sdata); 758 759 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) { 760 ieee80211_key_replace(key->sdata, key->sta, 761 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 762 key, NULL); 763 list_add_tail(&key->list, keys); 764 } 765 766 ieee80211_debugfs_key_update_default(sdata); 767 } 768 769 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata, 770 bool force_synchronize) 771 { 772 struct ieee80211_local *local = sdata->local; 773 struct ieee80211_sub_if_data *vlan; 774 struct ieee80211_sub_if_data *master; 775 struct ieee80211_key *key, *tmp; 776 LIST_HEAD(keys); 777 778 cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk); 779 780 mutex_lock(&local->key_mtx); 781 782 ieee80211_free_keys_iface(sdata, &keys); 783 784 if (sdata->vif.type == NL80211_IFTYPE_AP) { 785 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 786 ieee80211_free_keys_iface(vlan, &keys); 787 } 788 789 if (!list_empty(&keys) || force_synchronize) 790 synchronize_net(); 791 list_for_each_entry_safe(key, tmp, &keys, list) 792 __ieee80211_key_destroy(key, false); 793 794 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 795 if (sdata->bss) { 796 master = container_of(sdata->bss, 797 struct ieee80211_sub_if_data, 798 u.ap); 799 800 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt != 801 master->crypto_tx_tailroom_needed_cnt); 802 } 803 } else { 804 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || 805 sdata->crypto_tx_tailroom_pending_dec); 806 } 807 808 if (sdata->vif.type == NL80211_IFTYPE_AP) { 809 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 810 WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt || 811 vlan->crypto_tx_tailroom_pending_dec); 812 } 813 814 mutex_unlock(&local->key_mtx); 815 } 816 817 void ieee80211_free_sta_keys(struct ieee80211_local *local, 818 struct sta_info *sta) 819 { 820 struct ieee80211_key *key; 821 int i; 822 823 mutex_lock(&local->key_mtx); 824 for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) { 825 key = key_mtx_dereference(local, sta->gtk[i]); 826 if (!key) 827 continue; 828 ieee80211_key_replace(key->sdata, key->sta, 829 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 830 key, NULL); 831 __ieee80211_key_destroy(key, true); 832 } 833 834 for (i = 0; i < NUM_DEFAULT_KEYS; i++) { 835 key = key_mtx_dereference(local, sta->ptk[i]); 836 if (!key) 837 continue; 838 ieee80211_key_replace(key->sdata, key->sta, 839 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, 840 key, NULL); 841 __ieee80211_key_destroy(key, true); 842 } 843 844 mutex_unlock(&local->key_mtx); 845 } 846 847 void ieee80211_delayed_tailroom_dec(struct work_struct *wk) 848 { 849 struct ieee80211_sub_if_data *sdata; 850 851 sdata = container_of(wk, struct ieee80211_sub_if_data, 852 dec_tailroom_needed_wk.work); 853 854 /* 855 * The reason for the delayed tailroom needed decrementing is to 856 * make roaming faster: during roaming, all keys are first deleted 857 * and then new keys are installed. The first new key causes the 858 * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes 859 * the cost of synchronize_net() (which can be slow). Avoid this 860 * by deferring the crypto_tx_tailroom_needed_cnt decrementing on 861 * key removal for a while, so if we roam the value is larger than 862 * zero and no 0->1 transition happens. 863 * 864 * The cost is that if the AP switching was from an AP with keys 865 * to one without, we still allocate tailroom while it would no 866 * longer be needed. However, in the typical (fast) roaming case 867 * within an ESS this usually won't happen. 868 */ 869 870 mutex_lock(&sdata->local->key_mtx); 871 decrease_tailroom_need_count(sdata, 872 sdata->crypto_tx_tailroom_pending_dec); 873 sdata->crypto_tx_tailroom_pending_dec = 0; 874 mutex_unlock(&sdata->local->key_mtx); 875 } 876 877 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid, 878 const u8 *replay_ctr, gfp_t gfp) 879 { 880 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 881 882 trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr); 883 884 cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp); 885 } 886 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify); 887 888 void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf, 889 struct ieee80211_key_seq *seq) 890 { 891 struct ieee80211_key *key; 892 u64 pn64; 893 894 if (WARN_ON(!(keyconf->flags & IEEE80211_KEY_FLAG_GENERATE_IV))) 895 return; 896 897 key = container_of(keyconf, struct ieee80211_key, conf); 898 899 switch (key->conf.cipher) { 900 case WLAN_CIPHER_SUITE_TKIP: 901 seq->tkip.iv32 = key->u.tkip.tx.iv32; 902 seq->tkip.iv16 = key->u.tkip.tx.iv16; 903 break; 904 case WLAN_CIPHER_SUITE_CCMP: 905 case WLAN_CIPHER_SUITE_CCMP_256: 906 case WLAN_CIPHER_SUITE_AES_CMAC: 907 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 908 BUILD_BUG_ON(offsetof(typeof(*seq), ccmp) != 909 offsetof(typeof(*seq), aes_cmac)); 910 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 911 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 912 BUILD_BUG_ON(offsetof(typeof(*seq), ccmp) != 913 offsetof(typeof(*seq), aes_gmac)); 914 case WLAN_CIPHER_SUITE_GCMP: 915 case WLAN_CIPHER_SUITE_GCMP_256: 916 BUILD_BUG_ON(offsetof(typeof(*seq), ccmp) != 917 offsetof(typeof(*seq), gcmp)); 918 pn64 = atomic64_read(&key->conf.tx_pn); 919 seq->ccmp.pn[5] = pn64; 920 seq->ccmp.pn[4] = pn64 >> 8; 921 seq->ccmp.pn[3] = pn64 >> 16; 922 seq->ccmp.pn[2] = pn64 >> 24; 923 seq->ccmp.pn[1] = pn64 >> 32; 924 seq->ccmp.pn[0] = pn64 >> 40; 925 break; 926 default: 927 WARN_ON(1); 928 } 929 } 930 EXPORT_SYMBOL(ieee80211_get_key_tx_seq); 931 932 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf, 933 int tid, struct ieee80211_key_seq *seq) 934 { 935 struct ieee80211_key *key; 936 const u8 *pn; 937 938 key = container_of(keyconf, struct ieee80211_key, conf); 939 940 switch (key->conf.cipher) { 941 case WLAN_CIPHER_SUITE_TKIP: 942 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) 943 return; 944 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32; 945 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16; 946 break; 947 case WLAN_CIPHER_SUITE_CCMP: 948 case WLAN_CIPHER_SUITE_CCMP_256: 949 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 950 return; 951 if (tid < 0) 952 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; 953 else 954 pn = key->u.ccmp.rx_pn[tid]; 955 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN); 956 break; 957 case WLAN_CIPHER_SUITE_AES_CMAC: 958 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 959 if (WARN_ON(tid != 0)) 960 return; 961 pn = key->u.aes_cmac.rx_pn; 962 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN); 963 break; 964 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 965 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 966 if (WARN_ON(tid != 0)) 967 return; 968 pn = key->u.aes_gmac.rx_pn; 969 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN); 970 break; 971 case WLAN_CIPHER_SUITE_GCMP: 972 case WLAN_CIPHER_SUITE_GCMP_256: 973 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 974 return; 975 if (tid < 0) 976 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; 977 else 978 pn = key->u.gcmp.rx_pn[tid]; 979 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN); 980 break; 981 } 982 } 983 EXPORT_SYMBOL(ieee80211_get_key_rx_seq); 984 985 void ieee80211_set_key_tx_seq(struct ieee80211_key_conf *keyconf, 986 struct ieee80211_key_seq *seq) 987 { 988 struct ieee80211_key *key; 989 u64 pn64; 990 991 key = container_of(keyconf, struct ieee80211_key, conf); 992 993 switch (key->conf.cipher) { 994 case WLAN_CIPHER_SUITE_TKIP: 995 key->u.tkip.tx.iv32 = seq->tkip.iv32; 996 key->u.tkip.tx.iv16 = seq->tkip.iv16; 997 break; 998 case WLAN_CIPHER_SUITE_CCMP: 999 case WLAN_CIPHER_SUITE_CCMP_256: 1000 case WLAN_CIPHER_SUITE_AES_CMAC: 1001 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1002 BUILD_BUG_ON(offsetof(typeof(*seq), ccmp) != 1003 offsetof(typeof(*seq), aes_cmac)); 1004 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1005 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1006 BUILD_BUG_ON(offsetof(typeof(*seq), ccmp) != 1007 offsetof(typeof(*seq), aes_gmac)); 1008 case WLAN_CIPHER_SUITE_GCMP: 1009 case WLAN_CIPHER_SUITE_GCMP_256: 1010 BUILD_BUG_ON(offsetof(typeof(*seq), ccmp) != 1011 offsetof(typeof(*seq), gcmp)); 1012 pn64 = (u64)seq->ccmp.pn[5] | 1013 ((u64)seq->ccmp.pn[4] << 8) | 1014 ((u64)seq->ccmp.pn[3] << 16) | 1015 ((u64)seq->ccmp.pn[2] << 24) | 1016 ((u64)seq->ccmp.pn[1] << 32) | 1017 ((u64)seq->ccmp.pn[0] << 40); 1018 atomic64_set(&key->conf.tx_pn, pn64); 1019 break; 1020 default: 1021 WARN_ON(1); 1022 break; 1023 } 1024 } 1025 EXPORT_SYMBOL_GPL(ieee80211_set_key_tx_seq); 1026 1027 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf, 1028 int tid, struct ieee80211_key_seq *seq) 1029 { 1030 struct ieee80211_key *key; 1031 u8 *pn; 1032 1033 key = container_of(keyconf, struct ieee80211_key, conf); 1034 1035 switch (key->conf.cipher) { 1036 case WLAN_CIPHER_SUITE_TKIP: 1037 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) 1038 return; 1039 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32; 1040 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16; 1041 break; 1042 case WLAN_CIPHER_SUITE_CCMP: 1043 case WLAN_CIPHER_SUITE_CCMP_256: 1044 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1045 return; 1046 if (tid < 0) 1047 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; 1048 else 1049 pn = key->u.ccmp.rx_pn[tid]; 1050 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN); 1051 break; 1052 case WLAN_CIPHER_SUITE_AES_CMAC: 1053 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1054 if (WARN_ON(tid != 0)) 1055 return; 1056 pn = key->u.aes_cmac.rx_pn; 1057 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN); 1058 break; 1059 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1060 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1061 if (WARN_ON(tid != 0)) 1062 return; 1063 pn = key->u.aes_gmac.rx_pn; 1064 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN); 1065 break; 1066 case WLAN_CIPHER_SUITE_GCMP: 1067 case WLAN_CIPHER_SUITE_GCMP_256: 1068 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) 1069 return; 1070 if (tid < 0) 1071 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; 1072 else 1073 pn = key->u.gcmp.rx_pn[tid]; 1074 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN); 1075 break; 1076 default: 1077 WARN_ON(1); 1078 break; 1079 } 1080 } 1081 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq); 1082 1083 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf) 1084 { 1085 struct ieee80211_key *key; 1086 1087 key = container_of(keyconf, struct ieee80211_key, conf); 1088 1089 assert_key_lock(key->local); 1090 1091 /* 1092 * if key was uploaded, we assume the driver will/has remove(d) 1093 * it, so adjust bookkeeping accordingly 1094 */ 1095 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { 1096 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; 1097 1098 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || 1099 (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) 1100 increment_tailroom_need_count(key->sdata); 1101 } 1102 1103 ieee80211_key_free(key, false); 1104 } 1105 EXPORT_SYMBOL_GPL(ieee80211_remove_key); 1106 1107 struct ieee80211_key_conf * 1108 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif, 1109 struct ieee80211_key_conf *keyconf) 1110 { 1111 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1112 struct ieee80211_local *local = sdata->local; 1113 struct ieee80211_key *key; 1114 int err; 1115 1116 if (WARN_ON(!local->wowlan)) 1117 return ERR_PTR(-EINVAL); 1118 1119 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 1120 return ERR_PTR(-EINVAL); 1121 1122 key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx, 1123 keyconf->keylen, keyconf->key, 1124 0, NULL, NULL); 1125 if (IS_ERR(key)) 1126 return ERR_CAST(key); 1127 1128 if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED) 1129 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT; 1130 1131 err = ieee80211_key_link(key, sdata, NULL); 1132 if (err) 1133 return ERR_PTR(err); 1134 1135 return &key->conf; 1136 } 1137 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add); 1138