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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2002-2005, Instant802 Networks, Inc.
4 * Copyright 2005-2006, Devicescape Software, Inc.
5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
6 * Copyright 2007-2008 Johannes Berg <johannes@sipsolutions.net>
7 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 * Copyright 2015-2017 Intel Deutschland GmbH
9 * Copyright 2018-2020 Intel Corporation
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 <crypto/algapi.h>
21#include <asm/unaligned.h>
22#include "ieee80211_i.h"
23#include "driver-ops.h"
24#include "debugfs_key.h"
25#include "aes_ccm.h"
26#include "aes_cmac.h"
27#include "aes_gmac.h"
28#include "aes_gcm.h"
29
30
31/**
32 * DOC: Key handling basics
33 *
34 * Key handling in mac80211 is done based on per-interface (sub_if_data)
35 * keys and per-station keys. Since each station belongs to an interface,
36 * each station key also belongs to that interface.
37 *
38 * Hardware acceleration is done on a best-effort basis for algorithms
39 * that are implemented in software, for each key the hardware is asked
40 * to enable that key for offloading but if it cannot do that the key is
41 * simply kept for software encryption (unless it is for an algorithm
42 * that isn't implemented in software).
43 * There is currently no way of knowing whether a key is handled in SW
44 * or HW except by looking into debugfs.
45 *
46 * All key management is internally protected by a mutex. Within all
47 * other parts of mac80211, key references are, just as STA structure
48 * references, protected by RCU. Note, however, that some things are
49 * unprotected, namely the key->sta dereferences within the hardware
50 * acceleration functions. This means that sta_info_destroy() must
51 * remove the key which waits for an RCU grace period.
52 */
53
54static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
55
56static void assert_key_lock(struct ieee80211_local *local)
57{
58 lockdep_assert_held(&local->key_mtx);
59}
60
61static void
62update_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
80static 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
114static 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
125static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
126{
127 struct ieee80211_sub_if_data *sdata = key->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 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE &&
142 !(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
143 IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
144 IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
145 increment_tailroom_need_count(sdata);
146
147 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
148 return -EINVAL;
149 }
150
151 if (!key->local->ops->set_key)
152 goto out_unsupported;
153
154 assert_key_lock(key->local);
155
156 sta = key->sta;
157
158 /*
159 * If this is a per-STA GTK, check if it
160 * is supported; if not, return.
161 */
162 if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) &&
163 !ieee80211_hw_check(&key->local->hw, SUPPORTS_PER_STA_GTK))
164 goto out_unsupported;
165
166 if (sta && !sta->uploaded)
167 goto out_unsupported;
168
169 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
170 /*
171 * The driver doesn't know anything about VLAN interfaces.
172 * Hence, don't send GTKs for VLAN interfaces to the driver.
173 */
174 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
175 ret = 1;
176 goto out_unsupported;
177 }
178 }
179
180 ret = drv_set_key(key->local, SET_KEY, sdata,
181 sta ? &sta->sta : NULL, &key->conf);
182
183 if (!ret) {
184 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
185
186 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
187 IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
188 IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
189 decrease_tailroom_need_count(sdata, 1);
190
191 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
192 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
193
194 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) &&
195 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC));
196
197 return 0;
198 }
199
200 if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1)
201 sdata_err(sdata,
202 "failed to set key (%d, %pM) to hardware (%d)\n",
203 key->conf.keyidx,
204 sta ? sta->sta.addr : bcast_addr, ret);
205
206 out_unsupported:
207 switch (key->conf.cipher) {
208 case WLAN_CIPHER_SUITE_WEP40:
209 case WLAN_CIPHER_SUITE_WEP104:
210 case WLAN_CIPHER_SUITE_TKIP:
211 case WLAN_CIPHER_SUITE_CCMP:
212 case WLAN_CIPHER_SUITE_CCMP_256:
213 case WLAN_CIPHER_SUITE_GCMP:
214 case WLAN_CIPHER_SUITE_GCMP_256:
215 case WLAN_CIPHER_SUITE_AES_CMAC:
216 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
217 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
218 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
219 /* all of these we can do in software - if driver can */
220 if (ret == 1)
221 return 0;
222 if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL))
223 return -EINVAL;
224 return 0;
225 default:
226 return -EINVAL;
227 }
228}
229
230static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
231{
232 struct ieee80211_sub_if_data *sdata;
233 struct sta_info *sta;
234 int ret;
235
236 might_sleep();
237
238 if (!key || !key->local->ops->set_key)
239 return;
240
241 assert_key_lock(key->local);
242
243 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
244 return;
245
246 sta = key->sta;
247 sdata = key->sdata;
248
249 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
250 IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
251 IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
252 increment_tailroom_need_count(sdata);
253
254 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
255 ret = drv_set_key(key->local, DISABLE_KEY, sdata,
256 sta ? &sta->sta : NULL, &key->conf);
257
258 if (ret)
259 sdata_err(sdata,
260 "failed to remove key (%d, %pM) from hardware (%d)\n",
261 key->conf.keyidx,
262 sta ? sta->sta.addr : bcast_addr, ret);
263}
264
265static int _ieee80211_set_tx_key(struct ieee80211_key *key, bool force)
266{
267 struct sta_info *sta = key->sta;
268 struct ieee80211_local *local = key->local;
269
270 assert_key_lock(local);
271
272 set_sta_flag(sta, WLAN_STA_USES_ENCRYPTION);
273
274 sta->ptk_idx = key->conf.keyidx;
275
276 if (force || !ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT))
277 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
278 ieee80211_check_fast_xmit(sta);
279
280 return 0;
281}
282
283int ieee80211_set_tx_key(struct ieee80211_key *key)
284{
285 return _ieee80211_set_tx_key(key, false);
286}
287
288static void ieee80211_pairwise_rekey(struct ieee80211_key *old,
289 struct ieee80211_key *new)
290{
291 struct ieee80211_local *local = new->local;
292 struct sta_info *sta = new->sta;
293 int i;
294
295 assert_key_lock(local);
296
297 if (new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX) {
298 /* Extended Key ID key install, initial one or rekey */
299
300 if (sta->ptk_idx != INVALID_PTK_KEYIDX &&
301 !ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT)) {
302 /* Aggregation Sessions with Extended Key ID must not
303 * mix MPDUs with different keyIDs within one A-MPDU.
304 * Tear down running Tx aggregation sessions and block
305 * new Rx/Tx aggregation requests during rekey to
306 * ensure there are no A-MPDUs when the driver is not
307 * supporting A-MPDU key borders. (Blocking Tx only
308 * would be sufficient but WLAN_STA_BLOCK_BA gets the
309 * job done for the few ms we need it.)
310 */
311 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
312 mutex_lock(&sta->ampdu_mlme.mtx);
313 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
314 ___ieee80211_stop_tx_ba_session(sta, i,
315 AGG_STOP_LOCAL_REQUEST);
316 mutex_unlock(&sta->ampdu_mlme.mtx);
317 }
318 } else if (old) {
319 /* Rekey without Extended Key ID.
320 * Aggregation sessions are OK when running on SW crypto.
321 * A broken remote STA may cause issues not observed with HW
322 * crypto, though.
323 */
324 if (!(old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
325 return;
326
327 /* Stop Tx till we are on the new key */
328 old->flags |= KEY_FLAG_TAINTED;
329 ieee80211_clear_fast_xmit(sta);
330 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
331 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
332 ieee80211_sta_tear_down_BA_sessions(sta,
333 AGG_STOP_LOCAL_REQUEST);
334 }
335 if (!wiphy_ext_feature_isset(local->hw.wiphy,
336 NL80211_EXT_FEATURE_CAN_REPLACE_PTK0)) {
337 pr_warn_ratelimited("Rekeying PTK for STA %pM but driver can't safely do that.",
338 sta->sta.addr);
339 /* Flushing the driver queues *may* help prevent
340 * the clear text leaks and freezes.
341 */
342 ieee80211_flush_queues(local, old->sdata, false);
343 }
344 }
345}
346
347static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
348 int idx, bool uni, bool multi)
349{
350 struct ieee80211_key *key = NULL;
351
352 assert_key_lock(sdata->local);
353
354 if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
355 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
356
357 if (uni) {
358 rcu_assign_pointer(sdata->default_unicast_key, key);
359 ieee80211_check_fast_xmit_iface(sdata);
360 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
361 drv_set_default_unicast_key(sdata->local, sdata, idx);
362 }
363
364 if (multi)
365 rcu_assign_pointer(sdata->default_multicast_key, key);
366
367 ieee80211_debugfs_key_update_default(sdata);
368}
369
370void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
371 bool uni, bool multi)
372{
373 mutex_lock(&sdata->local->key_mtx);
374 __ieee80211_set_default_key(sdata, idx, uni, multi);
375 mutex_unlock(&sdata->local->key_mtx);
376}
377
378static void
379__ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
380{
381 struct ieee80211_key *key = NULL;
382
383 assert_key_lock(sdata->local);
384
385 if (idx >= NUM_DEFAULT_KEYS &&
386 idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
387 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
388
389 rcu_assign_pointer(sdata->default_mgmt_key, key);
390
391 ieee80211_debugfs_key_update_default(sdata);
392}
393
394void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
395 int idx)
396{
397 mutex_lock(&sdata->local->key_mtx);
398 __ieee80211_set_default_mgmt_key(sdata, idx);
399 mutex_unlock(&sdata->local->key_mtx);
400}
401
402static void
403__ieee80211_set_default_beacon_key(struct ieee80211_sub_if_data *sdata, int idx)
404{
405 struct ieee80211_key *key = NULL;
406
407 assert_key_lock(sdata->local);
408
409 if (idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS &&
410 idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
411 NUM_DEFAULT_BEACON_KEYS)
412 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
413
414 rcu_assign_pointer(sdata->default_beacon_key, key);
415
416 ieee80211_debugfs_key_update_default(sdata);
417}
418
419void ieee80211_set_default_beacon_key(struct ieee80211_sub_if_data *sdata,
420 int idx)
421{
422 mutex_lock(&sdata->local->key_mtx);
423 __ieee80211_set_default_beacon_key(sdata, idx);
424 mutex_unlock(&sdata->local->key_mtx);
425}
426
427static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
428 struct sta_info *sta,
429 bool pairwise,
430 struct ieee80211_key *old,
431 struct ieee80211_key *new)
432{
433 int idx;
434 int ret = 0;
435 bool defunikey, defmultikey, defmgmtkey, defbeaconkey;
436
437 /* caller must provide at least one old/new */
438 if (WARN_ON(!new && !old))
439 return 0;
440
441 if (new)
442 list_add_tail_rcu(&new->list, &sdata->key_list);
443
444 WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
445
446 if (new && sta && pairwise) {
447 /* Unicast rekey needs special handling. With Extended Key ID
448 * old is still NULL for the first rekey.
449 */
450 ieee80211_pairwise_rekey(old, new);
451 }
452
453 if (old) {
454 idx = old->conf.keyidx;
455
456 if (old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
457 ieee80211_key_disable_hw_accel(old);
458
459 if (new)
460 ret = ieee80211_key_enable_hw_accel(new);
461 }
462 } else {
463 /* new must be provided in case old is not */
464 idx = new->conf.keyidx;
465 if (!new->local->wowlan)
466 ret = ieee80211_key_enable_hw_accel(new);
467 }
468
469 if (ret)
470 return ret;
471
472 if (sta) {
473 if (pairwise) {
474 rcu_assign_pointer(sta->ptk[idx], new);
475 if (new &&
476 !(new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX))
477 _ieee80211_set_tx_key(new, true);
478 } else {
479 rcu_assign_pointer(sta->gtk[idx], new);
480 }
481 /* Only needed for transition from no key -> key.
482 * Still triggers unnecessary when using Extended Key ID
483 * and installing the second key ID the first time.
484 */
485 if (new && !old)
486 ieee80211_check_fast_rx(sta);
487 } else {
488 defunikey = old &&
489 old == key_mtx_dereference(sdata->local,
490 sdata->default_unicast_key);
491 defmultikey = old &&
492 old == key_mtx_dereference(sdata->local,
493 sdata->default_multicast_key);
494 defmgmtkey = old &&
495 old == key_mtx_dereference(sdata->local,
496 sdata->default_mgmt_key);
497 defbeaconkey = old &&
498 old == key_mtx_dereference(sdata->local,
499 sdata->default_beacon_key);
500
501 if (defunikey && !new)
502 __ieee80211_set_default_key(sdata, -1, true, false);
503 if (defmultikey && !new)
504 __ieee80211_set_default_key(sdata, -1, false, true);
505 if (defmgmtkey && !new)
506 __ieee80211_set_default_mgmt_key(sdata, -1);
507 if (defbeaconkey && !new)
508 __ieee80211_set_default_beacon_key(sdata, -1);
509
510 rcu_assign_pointer(sdata->keys[idx], new);
511 if (defunikey && new)
512 __ieee80211_set_default_key(sdata, new->conf.keyidx,
513 true, false);
514 if (defmultikey && new)
515 __ieee80211_set_default_key(sdata, new->conf.keyidx,
516 false, true);
517 if (defmgmtkey && new)
518 __ieee80211_set_default_mgmt_key(sdata,
519 new->conf.keyidx);
520 if (defbeaconkey && new)
521 __ieee80211_set_default_beacon_key(sdata,
522 new->conf.keyidx);
523 }
524
525 if (old)
526 list_del_rcu(&old->list);
527
528 return 0;
529}
530
531struct ieee80211_key *
532ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
533 const u8 *key_data,
534 size_t seq_len, const u8 *seq,
535 const struct ieee80211_cipher_scheme *cs)
536{
537 struct ieee80211_key *key;
538 int i, j, err;
539
540 if (WARN_ON(idx < 0 ||
541 idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
542 NUM_DEFAULT_BEACON_KEYS))
543 return ERR_PTR(-EINVAL);
544
545 key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
546 if (!key)
547 return ERR_PTR(-ENOMEM);
548
549 /*
550 * Default to software encryption; we'll later upload the
551 * key to the hardware if possible.
552 */
553 key->conf.flags = 0;
554 key->flags = 0;
555
556 key->conf.cipher = cipher;
557 key->conf.keyidx = idx;
558 key->conf.keylen = key_len;
559 switch (cipher) {
560 case WLAN_CIPHER_SUITE_WEP40:
561 case WLAN_CIPHER_SUITE_WEP104:
562 key->conf.iv_len = IEEE80211_WEP_IV_LEN;
563 key->conf.icv_len = IEEE80211_WEP_ICV_LEN;
564 break;
565 case WLAN_CIPHER_SUITE_TKIP:
566 key->conf.iv_len = IEEE80211_TKIP_IV_LEN;
567 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN;
568 if (seq) {
569 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
570 key->u.tkip.rx[i].iv32 =
571 get_unaligned_le32(&seq[2]);
572 key->u.tkip.rx[i].iv16 =
573 get_unaligned_le16(seq);
574 }
575 }
576 spin_lock_init(&key->u.tkip.txlock);
577 break;
578 case WLAN_CIPHER_SUITE_CCMP:
579 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN;
580 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN;
581 if (seq) {
582 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
583 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++)
584 key->u.ccmp.rx_pn[i][j] =
585 seq[IEEE80211_CCMP_PN_LEN - j - 1];
586 }
587 /*
588 * Initialize AES key state here as an optimization so that
589 * it does not need to be initialized for every packet.
590 */
591 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
592 key_data, key_len, IEEE80211_CCMP_MIC_LEN);
593 if (IS_ERR(key->u.ccmp.tfm)) {
594 err = PTR_ERR(key->u.ccmp.tfm);
595 kfree(key);
596 return ERR_PTR(err);
597 }
598 break;
599 case WLAN_CIPHER_SUITE_CCMP_256:
600 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN;
601 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN;
602 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
603 for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++)
604 key->u.ccmp.rx_pn[i][j] =
605 seq[IEEE80211_CCMP_256_PN_LEN - j - 1];
606 /* Initialize AES key state here as an optimization so that
607 * it does not need to be initialized for every packet.
608 */
609 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
610 key_data, key_len, IEEE80211_CCMP_256_MIC_LEN);
611 if (IS_ERR(key->u.ccmp.tfm)) {
612 err = PTR_ERR(key->u.ccmp.tfm);
613 kfree(key);
614 return ERR_PTR(err);
615 }
616 break;
617 case WLAN_CIPHER_SUITE_AES_CMAC:
618 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
619 key->conf.iv_len = 0;
620 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
621 key->conf.icv_len = sizeof(struct ieee80211_mmie);
622 else
623 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
624 if (seq)
625 for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
626 key->u.aes_cmac.rx_pn[j] =
627 seq[IEEE80211_CMAC_PN_LEN - j - 1];
628 /*
629 * Initialize AES key state here as an optimization so that
630 * it does not need to be initialized for every packet.
631 */
632 key->u.aes_cmac.tfm =
633 ieee80211_aes_cmac_key_setup(key_data, key_len);
634 if (IS_ERR(key->u.aes_cmac.tfm)) {
635 err = PTR_ERR(key->u.aes_cmac.tfm);
636 kfree(key);
637 return ERR_PTR(err);
638 }
639 break;
640 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
641 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
642 key->conf.iv_len = 0;
643 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
644 if (seq)
645 for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++)
646 key->u.aes_gmac.rx_pn[j] =
647 seq[IEEE80211_GMAC_PN_LEN - j - 1];
648 /* Initialize AES key state here as an optimization so that
649 * it does not need to be initialized for every packet.
650 */
651 key->u.aes_gmac.tfm =
652 ieee80211_aes_gmac_key_setup(key_data, key_len);
653 if (IS_ERR(key->u.aes_gmac.tfm)) {
654 err = PTR_ERR(key->u.aes_gmac.tfm);
655 kfree(key);
656 return ERR_PTR(err);
657 }
658 break;
659 case WLAN_CIPHER_SUITE_GCMP:
660 case WLAN_CIPHER_SUITE_GCMP_256:
661 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
662 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
663 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
664 for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
665 key->u.gcmp.rx_pn[i][j] =
666 seq[IEEE80211_GCMP_PN_LEN - j - 1];
667 /* Initialize AES key state here as an optimization so that
668 * it does not need to be initialized for every packet.
669 */
670 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
671 key_len);
672 if (IS_ERR(key->u.gcmp.tfm)) {
673 err = PTR_ERR(key->u.gcmp.tfm);
674 kfree(key);
675 return ERR_PTR(err);
676 }
677 break;
678 default:
679 if (cs) {
680 if (seq_len && seq_len != cs->pn_len) {
681 kfree(key);
682 return ERR_PTR(-EINVAL);
683 }
684
685 key->conf.iv_len = cs->hdr_len;
686 key->conf.icv_len = cs->mic_len;
687 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
688 for (j = 0; j < seq_len; j++)
689 key->u.gen.rx_pn[i][j] =
690 seq[seq_len - j - 1];
691 key->flags |= KEY_FLAG_CIPHER_SCHEME;
692 }
693 }
694 memcpy(key->conf.key, key_data, key_len);
695 INIT_LIST_HEAD(&key->list);
696
697 return key;
698}
699
700static void ieee80211_key_free_common(struct ieee80211_key *key)
701{
702 switch (key->conf.cipher) {
703 case WLAN_CIPHER_SUITE_CCMP:
704 case WLAN_CIPHER_SUITE_CCMP_256:
705 ieee80211_aes_key_free(key->u.ccmp.tfm);
706 break;
707 case WLAN_CIPHER_SUITE_AES_CMAC:
708 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
709 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
710 break;
711 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
712 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
713 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm);
714 break;
715 case WLAN_CIPHER_SUITE_GCMP:
716 case WLAN_CIPHER_SUITE_GCMP_256:
717 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
718 break;
719 }
720 kfree_sensitive(key);
721}
722
723static void __ieee80211_key_destroy(struct ieee80211_key *key,
724 bool delay_tailroom)
725{
726 if (key->local) {
727 struct ieee80211_sub_if_data *sdata = key->sdata;
728
729 ieee80211_debugfs_key_remove(key);
730
731 if (delay_tailroom) {
732 /* see ieee80211_delayed_tailroom_dec */
733 sdata->crypto_tx_tailroom_pending_dec++;
734 schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
735 HZ/2);
736 } else {
737 decrease_tailroom_need_count(sdata, 1);
738 }
739 }
740
741 ieee80211_key_free_common(key);
742}
743
744static void ieee80211_key_destroy(struct ieee80211_key *key,
745 bool delay_tailroom)
746{
747 if (!key)
748 return;
749
750 /*
751 * Synchronize so the TX path and rcu key iterators
752 * can no longer be using this key before we free/remove it.
753 */
754 synchronize_net();
755
756 __ieee80211_key_destroy(key, delay_tailroom);
757}
758
759void ieee80211_key_free_unused(struct ieee80211_key *key)
760{
761 WARN_ON(key->sdata || key->local);
762 ieee80211_key_free_common(key);
763}
764
765static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata,
766 struct ieee80211_key *old,
767 struct ieee80211_key *new)
768{
769 u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP];
770 u8 *tk_old, *tk_new;
771
772 if (!old || new->conf.keylen != old->conf.keylen)
773 return false;
774
775 tk_old = old->conf.key;
776 tk_new = new->conf.key;
777
778 /*
779 * In station mode, don't compare the TX MIC key, as it's never used
780 * and offloaded rekeying may not care to send it to the host. This
781 * is the case in iwlwifi, for example.
782 */
783 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
784 new->conf.cipher == WLAN_CIPHER_SUITE_TKIP &&
785 new->conf.keylen == WLAN_KEY_LEN_TKIP &&
786 !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
787 memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP);
788 memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP);
789 memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
790 memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
791 tk_old = tkip_old;
792 tk_new = tkip_new;
793 }
794
795 return !crypto_memneq(tk_old, tk_new, new->conf.keylen);
796}
797
798int ieee80211_key_link(struct ieee80211_key *key,
799 struct ieee80211_sub_if_data *sdata,
800 struct sta_info *sta)
801{
802 static atomic_t key_color = ATOMIC_INIT(0);
803 struct ieee80211_key *old_key;
804 int idx = key->conf.keyidx;
805 bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
806 /*
807 * We want to delay tailroom updates only for station - in that
808 * case it helps roaming speed, but in other cases it hurts and
809 * can cause warnings to appear.
810 */
811 bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION;
812 int ret = -EOPNOTSUPP;
813
814 mutex_lock(&sdata->local->key_mtx);
815
816 if (sta && pairwise) {
817 struct ieee80211_key *alt_key;
818
819 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
820 alt_key = key_mtx_dereference(sdata->local, sta->ptk[idx ^ 1]);
821
822 /* The rekey code assumes that the old and new key are using
823 * the same cipher. Enforce the assumption for pairwise keys.
824 */
825 if ((alt_key && alt_key->conf.cipher != key->conf.cipher) ||
826 (old_key && old_key->conf.cipher != key->conf.cipher))
827 goto out;
828 } else if (sta) {
829 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
830 } else {
831 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
832 }
833
834 /* Non-pairwise keys must also not switch the cipher on rekey */
835 if (!pairwise) {
836 if (old_key && old_key->conf.cipher != key->conf.cipher)
837 goto out;
838 }
839
840 /*
841 * Silently accept key re-installation without really installing the
842 * new version of the key to avoid nonce reuse or replay issues.
843 */
844 if (ieee80211_key_identical(sdata, old_key, key)) {
845 ieee80211_key_free_unused(key);
846 ret = 0;
847 goto out;
848 }
849
850 key->local = sdata->local;
851 key->sdata = sdata;
852 key->sta = sta;
853
854 /*
855 * Assign a unique ID to every key so we can easily prevent mixed
856 * key and fragment cache attacks.
857 */
858 key->color = atomic_inc_return(&key_color);
859
860 increment_tailroom_need_count(sdata);
861
862 ret = ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
863
864 if (!ret) {
865 ieee80211_debugfs_key_add(key);
866 ieee80211_key_destroy(old_key, delay_tailroom);
867 } else {
868 ieee80211_key_free(key, delay_tailroom);
869 }
870
871 out:
872 mutex_unlock(&sdata->local->key_mtx);
873
874 return ret;
875}
876
877void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
878{
879 if (!key)
880 return;
881
882 /*
883 * Replace key with nothingness if it was ever used.
884 */
885 if (key->sdata)
886 ieee80211_key_replace(key->sdata, key->sta,
887 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
888 key, NULL);
889 ieee80211_key_destroy(key, delay_tailroom);
890}
891
892void ieee80211_reenable_keys(struct ieee80211_sub_if_data *sdata)
893{
894 struct ieee80211_key *key;
895 struct ieee80211_sub_if_data *vlan;
896
897 lockdep_assert_wiphy(sdata->local->hw.wiphy);
898
899 mutex_lock(&sdata->local->key_mtx);
900
901 sdata->crypto_tx_tailroom_needed_cnt = 0;
902 sdata->crypto_tx_tailroom_pending_dec = 0;
903
904 if (sdata->vif.type == NL80211_IFTYPE_AP) {
905 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
906 vlan->crypto_tx_tailroom_needed_cnt = 0;
907 vlan->crypto_tx_tailroom_pending_dec = 0;
908 }
909 }
910
911 if (ieee80211_sdata_running(sdata)) {
912 list_for_each_entry(key, &sdata->key_list, list) {
913 increment_tailroom_need_count(sdata);
914 ieee80211_key_enable_hw_accel(key);
915 }
916 }
917
918 mutex_unlock(&sdata->local->key_mtx);
919}
920
921void ieee80211_iter_keys(struct ieee80211_hw *hw,
922 struct ieee80211_vif *vif,
923 void (*iter)(struct ieee80211_hw *hw,
924 struct ieee80211_vif *vif,
925 struct ieee80211_sta *sta,
926 struct ieee80211_key_conf *key,
927 void *data),
928 void *iter_data)
929{
930 struct ieee80211_local *local = hw_to_local(hw);
931 struct ieee80211_key *key, *tmp;
932 struct ieee80211_sub_if_data *sdata;
933
934 lockdep_assert_wiphy(hw->wiphy);
935
936 mutex_lock(&local->key_mtx);
937 if (vif) {
938 sdata = vif_to_sdata(vif);
939 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
940 iter(hw, &sdata->vif,
941 key->sta ? &key->sta->sta : NULL,
942 &key->conf, iter_data);
943 } else {
944 list_for_each_entry(sdata, &local->interfaces, list)
945 list_for_each_entry_safe(key, tmp,
946 &sdata->key_list, list)
947 iter(hw, &sdata->vif,
948 key->sta ? &key->sta->sta : NULL,
949 &key->conf, iter_data);
950 }
951 mutex_unlock(&local->key_mtx);
952}
953EXPORT_SYMBOL(ieee80211_iter_keys);
954
955static void
956_ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
957 struct ieee80211_sub_if_data *sdata,
958 void (*iter)(struct ieee80211_hw *hw,
959 struct ieee80211_vif *vif,
960 struct ieee80211_sta *sta,
961 struct ieee80211_key_conf *key,
962 void *data),
963 void *iter_data)
964{
965 struct ieee80211_key *key;
966
967 list_for_each_entry_rcu(key, &sdata->key_list, list) {
968 /* skip keys of station in removal process */
969 if (key->sta && key->sta->removed)
970 continue;
971 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
972 continue;
973
974 iter(hw, &sdata->vif,
975 key->sta ? &key->sta->sta : NULL,
976 &key->conf, iter_data);
977 }
978}
979
980void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
981 struct ieee80211_vif *vif,
982 void (*iter)(struct ieee80211_hw *hw,
983 struct ieee80211_vif *vif,
984 struct ieee80211_sta *sta,
985 struct ieee80211_key_conf *key,
986 void *data),
987 void *iter_data)
988{
989 struct ieee80211_local *local = hw_to_local(hw);
990 struct ieee80211_sub_if_data *sdata;
991
992 if (vif) {
993 sdata = vif_to_sdata(vif);
994 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
995 } else {
996 list_for_each_entry_rcu(sdata, &local->interfaces, list)
997 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
998 }
999}
1000EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
1001
1002static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
1003 struct list_head *keys)
1004{
1005 struct ieee80211_key *key, *tmp;
1006
1007 decrease_tailroom_need_count(sdata,
1008 sdata->crypto_tx_tailroom_pending_dec);
1009 sdata->crypto_tx_tailroom_pending_dec = 0;
1010
1011 ieee80211_debugfs_key_remove_mgmt_default(sdata);
1012 ieee80211_debugfs_key_remove_beacon_default(sdata);
1013
1014 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
1015 ieee80211_key_replace(key->sdata, key->sta,
1016 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1017 key, NULL);
1018 list_add_tail(&key->list, keys);
1019 }
1020
1021 ieee80211_debugfs_key_update_default(sdata);
1022}
1023
1024void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
1025 bool force_synchronize)
1026{
1027 struct ieee80211_local *local = sdata->local;
1028 struct ieee80211_sub_if_data *vlan;
1029 struct ieee80211_sub_if_data *master;
1030 struct ieee80211_key *key, *tmp;
1031 LIST_HEAD(keys);
1032
1033 cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
1034
1035 mutex_lock(&local->key_mtx);
1036
1037 ieee80211_free_keys_iface(sdata, &keys);
1038
1039 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1040 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1041 ieee80211_free_keys_iface(vlan, &keys);
1042 }
1043
1044 if (!list_empty(&keys) || force_synchronize)
1045 synchronize_net();
1046 list_for_each_entry_safe(key, tmp, &keys, list)
1047 __ieee80211_key_destroy(key, false);
1048
1049 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1050 if (sdata->bss) {
1051 master = container_of(sdata->bss,
1052 struct ieee80211_sub_if_data,
1053 u.ap);
1054
1055 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
1056 master->crypto_tx_tailroom_needed_cnt);
1057 }
1058 } else {
1059 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
1060 sdata->crypto_tx_tailroom_pending_dec);
1061 }
1062
1063 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1064 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1065 WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
1066 vlan->crypto_tx_tailroom_pending_dec);
1067 }
1068
1069 mutex_unlock(&local->key_mtx);
1070}
1071
1072void ieee80211_free_sta_keys(struct ieee80211_local *local,
1073 struct sta_info *sta)
1074{
1075 struct ieee80211_key *key;
1076 int i;
1077
1078 mutex_lock(&local->key_mtx);
1079 for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) {
1080 key = key_mtx_dereference(local, sta->gtk[i]);
1081 if (!key)
1082 continue;
1083 ieee80211_key_replace(key->sdata, key->sta,
1084 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1085 key, NULL);
1086 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1087 NL80211_IFTYPE_STATION);
1088 }
1089
1090 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1091 key = key_mtx_dereference(local, sta->ptk[i]);
1092 if (!key)
1093 continue;
1094 ieee80211_key_replace(key->sdata, key->sta,
1095 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1096 key, NULL);
1097 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1098 NL80211_IFTYPE_STATION);
1099 }
1100
1101 mutex_unlock(&local->key_mtx);
1102}
1103
1104void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
1105{
1106 struct ieee80211_sub_if_data *sdata;
1107
1108 sdata = container_of(wk, struct ieee80211_sub_if_data,
1109 dec_tailroom_needed_wk.work);
1110
1111 /*
1112 * The reason for the delayed tailroom needed decrementing is to
1113 * make roaming faster: during roaming, all keys are first deleted
1114 * and then new keys are installed. The first new key causes the
1115 * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
1116 * the cost of synchronize_net() (which can be slow). Avoid this
1117 * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
1118 * key removal for a while, so if we roam the value is larger than
1119 * zero and no 0->1 transition happens.
1120 *
1121 * The cost is that if the AP switching was from an AP with keys
1122 * to one without, we still allocate tailroom while it would no
1123 * longer be needed. However, in the typical (fast) roaming case
1124 * within an ESS this usually won't happen.
1125 */
1126
1127 mutex_lock(&sdata->local->key_mtx);
1128 decrease_tailroom_need_count(sdata,
1129 sdata->crypto_tx_tailroom_pending_dec);
1130 sdata->crypto_tx_tailroom_pending_dec = 0;
1131 mutex_unlock(&sdata->local->key_mtx);
1132}
1133
1134void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
1135 const u8 *replay_ctr, gfp_t gfp)
1136{
1137 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1138
1139 trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
1140
1141 cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
1142}
1143EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
1144
1145void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
1146 int tid, struct ieee80211_key_seq *seq)
1147{
1148 struct ieee80211_key *key;
1149 const u8 *pn;
1150
1151 key = container_of(keyconf, struct ieee80211_key, conf);
1152
1153 switch (key->conf.cipher) {
1154 case WLAN_CIPHER_SUITE_TKIP:
1155 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1156 return;
1157 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
1158 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
1159 break;
1160 case WLAN_CIPHER_SUITE_CCMP:
1161 case WLAN_CIPHER_SUITE_CCMP_256:
1162 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1163 return;
1164 if (tid < 0)
1165 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1166 else
1167 pn = key->u.ccmp.rx_pn[tid];
1168 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
1169 break;
1170 case WLAN_CIPHER_SUITE_AES_CMAC:
1171 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1172 if (WARN_ON(tid != 0))
1173 return;
1174 pn = key->u.aes_cmac.rx_pn;
1175 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
1176 break;
1177 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1178 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1179 if (WARN_ON(tid != 0))
1180 return;
1181 pn = key->u.aes_gmac.rx_pn;
1182 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
1183 break;
1184 case WLAN_CIPHER_SUITE_GCMP:
1185 case WLAN_CIPHER_SUITE_GCMP_256:
1186 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1187 return;
1188 if (tid < 0)
1189 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1190 else
1191 pn = key->u.gcmp.rx_pn[tid];
1192 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
1193 break;
1194 }
1195}
1196EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
1197
1198void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1199 int tid, struct ieee80211_key_seq *seq)
1200{
1201 struct ieee80211_key *key;
1202 u8 *pn;
1203
1204 key = container_of(keyconf, struct ieee80211_key, conf);
1205
1206 switch (key->conf.cipher) {
1207 case WLAN_CIPHER_SUITE_TKIP:
1208 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1209 return;
1210 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1211 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1212 break;
1213 case WLAN_CIPHER_SUITE_CCMP:
1214 case WLAN_CIPHER_SUITE_CCMP_256:
1215 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1216 return;
1217 if (tid < 0)
1218 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1219 else
1220 pn = key->u.ccmp.rx_pn[tid];
1221 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1222 break;
1223 case WLAN_CIPHER_SUITE_AES_CMAC:
1224 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1225 if (WARN_ON(tid != 0))
1226 return;
1227 pn = key->u.aes_cmac.rx_pn;
1228 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1229 break;
1230 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1231 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1232 if (WARN_ON(tid != 0))
1233 return;
1234 pn = key->u.aes_gmac.rx_pn;
1235 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1236 break;
1237 case WLAN_CIPHER_SUITE_GCMP:
1238 case WLAN_CIPHER_SUITE_GCMP_256:
1239 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1240 return;
1241 if (tid < 0)
1242 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1243 else
1244 pn = key->u.gcmp.rx_pn[tid];
1245 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1246 break;
1247 default:
1248 WARN_ON(1);
1249 break;
1250 }
1251}
1252EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1253
1254void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1255{
1256 struct ieee80211_key *key;
1257
1258 key = container_of(keyconf, struct ieee80211_key, conf);
1259
1260 assert_key_lock(key->local);
1261
1262 /*
1263 * if key was uploaded, we assume the driver will/has remove(d)
1264 * it, so adjust bookkeeping accordingly
1265 */
1266 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1267 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1268
1269 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
1270 IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
1271 IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1272 increment_tailroom_need_count(key->sdata);
1273 }
1274
1275 ieee80211_key_free(key, false);
1276}
1277EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1278
1279struct ieee80211_key_conf *
1280ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1281 struct ieee80211_key_conf *keyconf)
1282{
1283 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1284 struct ieee80211_local *local = sdata->local;
1285 struct ieee80211_key *key;
1286 int err;
1287
1288 if (WARN_ON(!local->wowlan))
1289 return ERR_PTR(-EINVAL);
1290
1291 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1292 return ERR_PTR(-EINVAL);
1293
1294 key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1295 keyconf->keylen, keyconf->key,
1296 0, NULL, NULL);
1297 if (IS_ERR(key))
1298 return ERR_CAST(key);
1299
1300 if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1301 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1302
1303 err = ieee80211_key_link(key, sdata, NULL);
1304 if (err)
1305 return ERR_PTR(err);
1306
1307 return &key->conf;
1308}
1309EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);
1310
1311void ieee80211_key_mic_failure(struct ieee80211_key_conf *keyconf)
1312{
1313 struct ieee80211_key *key;
1314
1315 key = container_of(keyconf, struct ieee80211_key, conf);
1316
1317 switch (key->conf.cipher) {
1318 case WLAN_CIPHER_SUITE_AES_CMAC:
1319 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1320 key->u.aes_cmac.icverrors++;
1321 break;
1322 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1323 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1324 key->u.aes_gmac.icverrors++;
1325 break;
1326 default:
1327 /* ignore the others for now, we don't keep counters now */
1328 break;
1329 }
1330}
1331EXPORT_SYMBOL_GPL(ieee80211_key_mic_failure);
1332
1333void ieee80211_key_replay(struct ieee80211_key_conf *keyconf)
1334{
1335 struct ieee80211_key *key;
1336
1337 key = container_of(keyconf, struct ieee80211_key, conf);
1338
1339 switch (key->conf.cipher) {
1340 case WLAN_CIPHER_SUITE_CCMP:
1341 case WLAN_CIPHER_SUITE_CCMP_256:
1342 key->u.ccmp.replays++;
1343 break;
1344 case WLAN_CIPHER_SUITE_AES_CMAC:
1345 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1346 key->u.aes_cmac.replays++;
1347 break;
1348 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1349 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1350 key->u.aes_gmac.replays++;
1351 break;
1352 case WLAN_CIPHER_SUITE_GCMP:
1353 case WLAN_CIPHER_SUITE_GCMP_256:
1354 key->u.gcmp.replays++;
1355 break;
1356 }
1357}
1358EXPORT_SYMBOL_GPL(ieee80211_key_replay);
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 * Copyright 2015 Intel Deutschland GmbH
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/if_ether.h>
15#include <linux/etherdevice.h>
16#include <linux/list.h>
17#include <linux/rcupdate.h>
18#include <linux/rtnetlink.h>
19#include <linux/slab.h>
20#include <linux/export.h>
21#include <net/mac80211.h>
22#include <asm/unaligned.h>
23#include "ieee80211_i.h"
24#include "driver-ops.h"
25#include "debugfs_key.h"
26#include "aes_ccm.h"
27#include "aes_cmac.h"
28#include "aes_gmac.h"
29#include "aes_gcm.h"
30
31
32/**
33 * DOC: Key handling basics
34 *
35 * Key handling in mac80211 is done based on per-interface (sub_if_data)
36 * keys and per-station keys. Since each station belongs to an interface,
37 * each station key also belongs to that interface.
38 *
39 * Hardware acceleration is done on a best-effort basis for algorithms
40 * that are implemented in software, for each key the hardware is asked
41 * to enable that key for offloading but if it cannot do that the key is
42 * simply kept for software encryption (unless it is for an algorithm
43 * that isn't implemented in software).
44 * There is currently no way of knowing whether a key is handled in SW
45 * or HW except by looking into debugfs.
46 *
47 * All key management is internally protected by a mutex. Within all
48 * other parts of mac80211, key references are, just as STA structure
49 * references, protected by RCU. Note, however, that some things are
50 * unprotected, namely the key->sta dereferences within the hardware
51 * acceleration functions. This means that sta_info_destroy() must
52 * remove the key which waits for an RCU grace period.
53 */
54
55static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
56
57static void assert_key_lock(struct ieee80211_local *local)
58{
59 lockdep_assert_held(&local->key_mtx);
60}
61
62static void
63update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta)
64{
65 struct ieee80211_sub_if_data *vlan;
66
67 if (sdata->vif.type != NL80211_IFTYPE_AP)
68 return;
69
70 /* crypto_tx_tailroom_needed_cnt is protected by this */
71 assert_key_lock(sdata->local);
72
73 rcu_read_lock();
74
75 list_for_each_entry_rcu(vlan, &sdata->u.ap.vlans, u.vlan.list)
76 vlan->crypto_tx_tailroom_needed_cnt += delta;
77
78 rcu_read_unlock();
79}
80
81static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
82{
83 /*
84 * When this count is zero, SKB resizing for allocating tailroom
85 * for IV or MMIC is skipped. But, this check has created two race
86 * cases in xmit path while transiting from zero count to one:
87 *
88 * 1. SKB resize was skipped because no key was added but just before
89 * the xmit key is added and SW encryption kicks off.
90 *
91 * 2. SKB resize was skipped because all the keys were hw planted but
92 * just before xmit one of the key is deleted and SW encryption kicks
93 * off.
94 *
95 * In both the above case SW encryption will find not enough space for
96 * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
97 *
98 * Solution has been explained at
99 * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
100 */
101
102 assert_key_lock(sdata->local);
103
104 update_vlan_tailroom_need_count(sdata, 1);
105
106 if (!sdata->crypto_tx_tailroom_needed_cnt++) {
107 /*
108 * Flush all XMIT packets currently using HW encryption or no
109 * encryption at all if the count transition is from 0 -> 1.
110 */
111 synchronize_net();
112 }
113}
114
115static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata,
116 int delta)
117{
118 assert_key_lock(sdata->local);
119
120 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta);
121
122 update_vlan_tailroom_need_count(sdata, -delta);
123 sdata->crypto_tx_tailroom_needed_cnt -= delta;
124}
125
126static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
127{
128 struct ieee80211_sub_if_data *sdata;
129 struct sta_info *sta;
130 int ret = -EOPNOTSUPP;
131
132 might_sleep();
133
134 if (key->flags & KEY_FLAG_TAINTED) {
135 /* If we get here, it's during resume and the key is
136 * tainted so shouldn't be used/programmed any more.
137 * However, its flags may still indicate that it was
138 * programmed into the device (since we're in resume)
139 * so clear that flag now to avoid trying to remove
140 * it again later.
141 */
142 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
143 return -EINVAL;
144 }
145
146 if (!key->local->ops->set_key)
147 goto out_unsupported;
148
149 assert_key_lock(key->local);
150
151 sta = key->sta;
152
153 /*
154 * If this is a per-STA GTK, check if it
155 * is supported; if not, return.
156 */
157 if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) &&
158 !ieee80211_hw_check(&key->local->hw, SUPPORTS_PER_STA_GTK))
159 goto out_unsupported;
160
161 if (sta && !sta->uploaded)
162 goto out_unsupported;
163
164 sdata = key->sdata;
165 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
166 /*
167 * The driver doesn't know anything about VLAN interfaces.
168 * Hence, don't send GTKs for VLAN interfaces to the driver.
169 */
170 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE))
171 goto out_unsupported;
172 }
173
174 ret = drv_set_key(key->local, SET_KEY, sdata,
175 sta ? &sta->sta : NULL, &key->conf);
176
177 if (!ret) {
178 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
179
180 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
181 (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
182 decrease_tailroom_need_count(sdata, 1);
183
184 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
185 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
186
187 return 0;
188 }
189
190 if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1)
191 sdata_err(sdata,
192 "failed to set key (%d, %pM) to hardware (%d)\n",
193 key->conf.keyidx,
194 sta ? sta->sta.addr : bcast_addr, ret);
195
196 out_unsupported:
197 switch (key->conf.cipher) {
198 case WLAN_CIPHER_SUITE_WEP40:
199 case WLAN_CIPHER_SUITE_WEP104:
200 case WLAN_CIPHER_SUITE_TKIP:
201 case WLAN_CIPHER_SUITE_CCMP:
202 case WLAN_CIPHER_SUITE_CCMP_256:
203 case WLAN_CIPHER_SUITE_AES_CMAC:
204 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
205 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
206 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
207 case WLAN_CIPHER_SUITE_GCMP:
208 case WLAN_CIPHER_SUITE_GCMP_256:
209 /* all of these we can do in software - if driver can */
210 if (ret == 1)
211 return 0;
212 if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL))
213 return -EINVAL;
214 return 0;
215 default:
216 return -EINVAL;
217 }
218}
219
220static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
221{
222 struct ieee80211_sub_if_data *sdata;
223 struct sta_info *sta;
224 int ret;
225
226 might_sleep();
227
228 if (!key || !key->local->ops->set_key)
229 return;
230
231 assert_key_lock(key->local);
232
233 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
234 return;
235
236 sta = key->sta;
237 sdata = key->sdata;
238
239 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
240 (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
241 increment_tailroom_need_count(sdata);
242
243 ret = drv_set_key(key->local, DISABLE_KEY, sdata,
244 sta ? &sta->sta : NULL, &key->conf);
245
246 if (ret)
247 sdata_err(sdata,
248 "failed to remove key (%d, %pM) from hardware (%d)\n",
249 key->conf.keyidx,
250 sta ? sta->sta.addr : bcast_addr, ret);
251
252 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
253}
254
255static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
256 int idx, bool uni, bool multi)
257{
258 struct ieee80211_key *key = NULL;
259
260 assert_key_lock(sdata->local);
261
262 if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
263 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
264
265 if (uni) {
266 rcu_assign_pointer(sdata->default_unicast_key, key);
267 ieee80211_check_fast_xmit_iface(sdata);
268 drv_set_default_unicast_key(sdata->local, sdata, idx);
269 }
270
271 if (multi)
272 rcu_assign_pointer(sdata->default_multicast_key, key);
273
274 ieee80211_debugfs_key_update_default(sdata);
275}
276
277void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
278 bool uni, bool multi)
279{
280 mutex_lock(&sdata->local->key_mtx);
281 __ieee80211_set_default_key(sdata, idx, uni, multi);
282 mutex_unlock(&sdata->local->key_mtx);
283}
284
285static void
286__ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
287{
288 struct ieee80211_key *key = NULL;
289
290 assert_key_lock(sdata->local);
291
292 if (idx >= NUM_DEFAULT_KEYS &&
293 idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
294 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
295
296 rcu_assign_pointer(sdata->default_mgmt_key, key);
297
298 ieee80211_debugfs_key_update_default(sdata);
299}
300
301void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
302 int idx)
303{
304 mutex_lock(&sdata->local->key_mtx);
305 __ieee80211_set_default_mgmt_key(sdata, idx);
306 mutex_unlock(&sdata->local->key_mtx);
307}
308
309
310static void ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
311 struct sta_info *sta,
312 bool pairwise,
313 struct ieee80211_key *old,
314 struct ieee80211_key *new)
315{
316 int idx;
317 bool defunikey, defmultikey, defmgmtkey;
318
319 /* caller must provide at least one old/new */
320 if (WARN_ON(!new && !old))
321 return;
322
323 if (new)
324 list_add_tail_rcu(&new->list, &sdata->key_list);
325
326 WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
327
328 if (old)
329 idx = old->conf.keyidx;
330 else
331 idx = new->conf.keyidx;
332
333 if (sta) {
334 if (pairwise) {
335 rcu_assign_pointer(sta->ptk[idx], new);
336 sta->ptk_idx = idx;
337 ieee80211_check_fast_xmit(sta);
338 } else {
339 rcu_assign_pointer(sta->gtk[idx], new);
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_rcu(&old->list);
373}
374
375struct ieee80211_key *
376ieee80211_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
542static 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
565static 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
589static 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 and rcu key iterators
597 * can no longer be using this key before we free/remove it.
598 */
599 synchronize_net();
600
601 __ieee80211_key_destroy(key, delay_tailroom);
602}
603
604void ieee80211_key_free_unused(struct ieee80211_key *key)
605{
606 WARN_ON(key->sdata || key->local);
607 ieee80211_key_free_common(key);
608}
609
610int 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
654void 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
669void 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
698void 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
714void 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}
746EXPORT_SYMBOL(ieee80211_iter_keys);
747
748static void
749_ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
750 struct ieee80211_sub_if_data *sdata,
751 void (*iter)(struct ieee80211_hw *hw,
752 struct ieee80211_vif *vif,
753 struct ieee80211_sta *sta,
754 struct ieee80211_key_conf *key,
755 void *data),
756 void *iter_data)
757{
758 struct ieee80211_key *key;
759
760 list_for_each_entry_rcu(key, &sdata->key_list, list) {
761 /* skip keys of station in removal process */
762 if (key->sta && key->sta->removed)
763 continue;
764 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
765 continue;
766
767 iter(hw, &sdata->vif,
768 key->sta ? &key->sta->sta : NULL,
769 &key->conf, iter_data);
770 }
771}
772
773void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
774 struct ieee80211_vif *vif,
775 void (*iter)(struct ieee80211_hw *hw,
776 struct ieee80211_vif *vif,
777 struct ieee80211_sta *sta,
778 struct ieee80211_key_conf *key,
779 void *data),
780 void *iter_data)
781{
782 struct ieee80211_local *local = hw_to_local(hw);
783 struct ieee80211_sub_if_data *sdata;
784
785 if (vif) {
786 sdata = vif_to_sdata(vif);
787 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
788 } else {
789 list_for_each_entry_rcu(sdata, &local->interfaces, list)
790 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
791 }
792}
793EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
794
795static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
796 struct list_head *keys)
797{
798 struct ieee80211_key *key, *tmp;
799
800 decrease_tailroom_need_count(sdata,
801 sdata->crypto_tx_tailroom_pending_dec);
802 sdata->crypto_tx_tailroom_pending_dec = 0;
803
804 ieee80211_debugfs_key_remove_mgmt_default(sdata);
805
806 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
807 ieee80211_key_replace(key->sdata, key->sta,
808 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
809 key, NULL);
810 list_add_tail(&key->list, keys);
811 }
812
813 ieee80211_debugfs_key_update_default(sdata);
814}
815
816void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
817 bool force_synchronize)
818{
819 struct ieee80211_local *local = sdata->local;
820 struct ieee80211_sub_if_data *vlan;
821 struct ieee80211_sub_if_data *master;
822 struct ieee80211_key *key, *tmp;
823 LIST_HEAD(keys);
824
825 cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
826
827 mutex_lock(&local->key_mtx);
828
829 ieee80211_free_keys_iface(sdata, &keys);
830
831 if (sdata->vif.type == NL80211_IFTYPE_AP) {
832 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
833 ieee80211_free_keys_iface(vlan, &keys);
834 }
835
836 if (!list_empty(&keys) || force_synchronize)
837 synchronize_net();
838 list_for_each_entry_safe(key, tmp, &keys, list)
839 __ieee80211_key_destroy(key, false);
840
841 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
842 if (sdata->bss) {
843 master = container_of(sdata->bss,
844 struct ieee80211_sub_if_data,
845 u.ap);
846
847 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
848 master->crypto_tx_tailroom_needed_cnt);
849 }
850 } else {
851 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
852 sdata->crypto_tx_tailroom_pending_dec);
853 }
854
855 if (sdata->vif.type == NL80211_IFTYPE_AP) {
856 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
857 WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
858 vlan->crypto_tx_tailroom_pending_dec);
859 }
860
861 mutex_unlock(&local->key_mtx);
862}
863
864void ieee80211_free_sta_keys(struct ieee80211_local *local,
865 struct sta_info *sta)
866{
867 struct ieee80211_key *key;
868 int i;
869
870 mutex_lock(&local->key_mtx);
871 for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) {
872 key = key_mtx_dereference(local, sta->gtk[i]);
873 if (!key)
874 continue;
875 ieee80211_key_replace(key->sdata, key->sta,
876 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
877 key, NULL);
878 __ieee80211_key_destroy(key, true);
879 }
880
881 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
882 key = key_mtx_dereference(local, sta->ptk[i]);
883 if (!key)
884 continue;
885 ieee80211_key_replace(key->sdata, key->sta,
886 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
887 key, NULL);
888 __ieee80211_key_destroy(key, true);
889 }
890
891 mutex_unlock(&local->key_mtx);
892}
893
894void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
895{
896 struct ieee80211_sub_if_data *sdata;
897
898 sdata = container_of(wk, struct ieee80211_sub_if_data,
899 dec_tailroom_needed_wk.work);
900
901 /*
902 * The reason for the delayed tailroom needed decrementing is to
903 * make roaming faster: during roaming, all keys are first deleted
904 * and then new keys are installed. The first new key causes the
905 * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
906 * the cost of synchronize_net() (which can be slow). Avoid this
907 * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
908 * key removal for a while, so if we roam the value is larger than
909 * zero and no 0->1 transition happens.
910 *
911 * The cost is that if the AP switching was from an AP with keys
912 * to one without, we still allocate tailroom while it would no
913 * longer be needed. However, in the typical (fast) roaming case
914 * within an ESS this usually won't happen.
915 */
916
917 mutex_lock(&sdata->local->key_mtx);
918 decrease_tailroom_need_count(sdata,
919 sdata->crypto_tx_tailroom_pending_dec);
920 sdata->crypto_tx_tailroom_pending_dec = 0;
921 mutex_unlock(&sdata->local->key_mtx);
922}
923
924void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
925 const u8 *replay_ctr, gfp_t gfp)
926{
927 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
928
929 trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
930
931 cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
932}
933EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
934
935void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
936 int tid, struct ieee80211_key_seq *seq)
937{
938 struct ieee80211_key *key;
939 const u8 *pn;
940
941 key = container_of(keyconf, struct ieee80211_key, conf);
942
943 switch (key->conf.cipher) {
944 case WLAN_CIPHER_SUITE_TKIP:
945 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
946 return;
947 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
948 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
949 break;
950 case WLAN_CIPHER_SUITE_CCMP:
951 case WLAN_CIPHER_SUITE_CCMP_256:
952 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
953 return;
954 if (tid < 0)
955 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
956 else
957 pn = key->u.ccmp.rx_pn[tid];
958 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
959 break;
960 case WLAN_CIPHER_SUITE_AES_CMAC:
961 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
962 if (WARN_ON(tid != 0))
963 return;
964 pn = key->u.aes_cmac.rx_pn;
965 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
966 break;
967 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
968 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
969 if (WARN_ON(tid != 0))
970 return;
971 pn = key->u.aes_gmac.rx_pn;
972 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
973 break;
974 case WLAN_CIPHER_SUITE_GCMP:
975 case WLAN_CIPHER_SUITE_GCMP_256:
976 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
977 return;
978 if (tid < 0)
979 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
980 else
981 pn = key->u.gcmp.rx_pn[tid];
982 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
983 break;
984 }
985}
986EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
987
988void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
989 int tid, struct ieee80211_key_seq *seq)
990{
991 struct ieee80211_key *key;
992 u8 *pn;
993
994 key = container_of(keyconf, struct ieee80211_key, conf);
995
996 switch (key->conf.cipher) {
997 case WLAN_CIPHER_SUITE_TKIP:
998 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
999 return;
1000 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1001 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1002 break;
1003 case WLAN_CIPHER_SUITE_CCMP:
1004 case WLAN_CIPHER_SUITE_CCMP_256:
1005 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1006 return;
1007 if (tid < 0)
1008 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1009 else
1010 pn = key->u.ccmp.rx_pn[tid];
1011 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1012 break;
1013 case WLAN_CIPHER_SUITE_AES_CMAC:
1014 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1015 if (WARN_ON(tid != 0))
1016 return;
1017 pn = key->u.aes_cmac.rx_pn;
1018 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1019 break;
1020 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1021 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1022 if (WARN_ON(tid != 0))
1023 return;
1024 pn = key->u.aes_gmac.rx_pn;
1025 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1026 break;
1027 case WLAN_CIPHER_SUITE_GCMP:
1028 case WLAN_CIPHER_SUITE_GCMP_256:
1029 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1030 return;
1031 if (tid < 0)
1032 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1033 else
1034 pn = key->u.gcmp.rx_pn[tid];
1035 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1036 break;
1037 default:
1038 WARN_ON(1);
1039 break;
1040 }
1041}
1042EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1043
1044void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1045{
1046 struct ieee80211_key *key;
1047
1048 key = container_of(keyconf, struct ieee80211_key, conf);
1049
1050 assert_key_lock(key->local);
1051
1052 /*
1053 * if key was uploaded, we assume the driver will/has remove(d)
1054 * it, so adjust bookkeeping accordingly
1055 */
1056 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1057 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1058
1059 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
1060 (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1061 increment_tailroom_need_count(key->sdata);
1062 }
1063
1064 ieee80211_key_free(key, false);
1065}
1066EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1067
1068struct ieee80211_key_conf *
1069ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1070 struct ieee80211_key_conf *keyconf)
1071{
1072 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1073 struct ieee80211_local *local = sdata->local;
1074 struct ieee80211_key *key;
1075 int err;
1076
1077 if (WARN_ON(!local->wowlan))
1078 return ERR_PTR(-EINVAL);
1079
1080 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1081 return ERR_PTR(-EINVAL);
1082
1083 key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1084 keyconf->keylen, keyconf->key,
1085 0, NULL, NULL);
1086 if (IS_ERR(key))
1087 return ERR_CAST(key);
1088
1089 if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1090 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1091
1092 err = ieee80211_key_link(key, sdata, NULL);
1093 if (err)
1094 return ERR_PTR(err);
1095
1096 return &key->conf;
1097}
1098EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);