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 2015-2017 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 <crypto/algapi.h>
23 #include <asm/unaligned.h>
24 #include "ieee80211_i.h"
25 #include "driver-ops.h"
26 #include "debugfs_key.h"
27 #include "aes_ccm.h"
28 #include "aes_cmac.h"
29 #include "aes_gmac.h"
30 #include "aes_gcm.h"
31
32
33 /**
34 * DOC: Key handling basics
35 *
36 * Key handling in mac80211 is done based on per-interface (sub_if_data)
37 * keys and per-station keys. Since each station belongs to an interface,
38 * each station key also belongs to that interface.
39 *
40 * Hardware acceleration is done on a best-effort basis for algorithms
41 * that are implemented in software, for each key the hardware is asked
42 * to enable that key for offloading but if it cannot do that the key is
43 * simply kept for software encryption (unless it is for an algorithm
44 * that isn't implemented in software).
45 * There is currently no way of knowing whether a key is handled in SW
46 * or HW except by looking into debugfs.
47 *
48 * All key management is internally protected by a mutex. Within all
49 * other parts of mac80211, key references are, just as STA structure
50 * references, protected by RCU. Note, however, that some things are
51 * unprotected, namely the key->sta dereferences within the hardware
52 * acceleration functions. This means that sta_info_destroy() must
53 * remove the key which waits for an RCU grace period.
54 */
55
56 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
57
assert_key_lock(struct ieee80211_local * local)58 static void assert_key_lock(struct ieee80211_local *local)
59 {
60 lockdep_assert_held(&local->key_mtx);
61 }
62
63 static void
update_vlan_tailroom_need_count(struct ieee80211_sub_if_data * sdata,int delta)64 update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta)
65 {
66 struct ieee80211_sub_if_data *vlan;
67
68 if (sdata->vif.type != NL80211_IFTYPE_AP)
69 return;
70
71 /* crypto_tx_tailroom_needed_cnt is protected by this */
72 assert_key_lock(sdata->local);
73
74 rcu_read_lock();
75
76 list_for_each_entry_rcu(vlan, &sdata->u.ap.vlans, u.vlan.list)
77 vlan->crypto_tx_tailroom_needed_cnt += delta;
78
79 rcu_read_unlock();
80 }
81
increment_tailroom_need_count(struct ieee80211_sub_if_data * sdata)82 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
83 {
84 /*
85 * When this count is zero, SKB resizing for allocating tailroom
86 * for IV or MMIC is skipped. But, this check has created two race
87 * cases in xmit path while transiting from zero count to one:
88 *
89 * 1. SKB resize was skipped because no key was added but just before
90 * the xmit key is added and SW encryption kicks off.
91 *
92 * 2. SKB resize was skipped because all the keys were hw planted but
93 * just before xmit one of the key is deleted and SW encryption kicks
94 * off.
95 *
96 * In both the above case SW encryption will find not enough space for
97 * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
98 *
99 * Solution has been explained at
100 * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
101 */
102
103 assert_key_lock(sdata->local);
104
105 update_vlan_tailroom_need_count(sdata, 1);
106
107 if (!sdata->crypto_tx_tailroom_needed_cnt++) {
108 /*
109 * Flush all XMIT packets currently using HW encryption or no
110 * encryption at all if the count transition is from 0 -> 1.
111 */
112 synchronize_net();
113 }
114 }
115
decrease_tailroom_need_count(struct ieee80211_sub_if_data * sdata,int delta)116 static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata,
117 int delta)
118 {
119 assert_key_lock(sdata->local);
120
121 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta);
122
123 update_vlan_tailroom_need_count(sdata, -delta);
124 sdata->crypto_tx_tailroom_needed_cnt -= delta;
125 }
126
ieee80211_key_enable_hw_accel(struct ieee80211_key * key)127 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
128 {
129 struct ieee80211_sub_if_data *sdata;
130 struct sta_info *sta;
131 int ret = -EOPNOTSUPP;
132
133 might_sleep();
134
135 if (key->flags & KEY_FLAG_TAINTED) {
136 /* If we get here, it's during resume and the key is
137 * tainted so shouldn't be used/programmed any more.
138 * However, its flags may still indicate that it was
139 * programmed into the device (since we're in resume)
140 * so clear that flag now to avoid trying to remove
141 * it again later.
142 */
143 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
144 return -EINVAL;
145 }
146
147 if (!key->local->ops->set_key)
148 goto out_unsupported;
149
150 assert_key_lock(key->local);
151
152 sta = key->sta;
153
154 /*
155 * If this is a per-STA GTK, check if it
156 * is supported; if not, return.
157 */
158 if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) &&
159 !ieee80211_hw_check(&key->local->hw, SUPPORTS_PER_STA_GTK))
160 goto out_unsupported;
161
162 if (sta && !sta->uploaded)
163 goto out_unsupported;
164
165 sdata = key->sdata;
166 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
167 /*
168 * The driver doesn't know anything about VLAN interfaces.
169 * Hence, don't send GTKs for VLAN interfaces to the driver.
170 */
171 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE))
172 goto out_unsupported;
173 }
174
175 ret = drv_set_key(key->local, SET_KEY, sdata,
176 sta ? &sta->sta : NULL, &key->conf);
177
178 if (!ret) {
179 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
180
181 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
182 (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
183 decrease_tailroom_need_count(sdata, 1);
184
185 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
186 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
187
188 return 0;
189 }
190
191 if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1)
192 sdata_err(sdata,
193 "failed to set key (%d, %pM) to hardware (%d)\n",
194 key->conf.keyidx,
195 sta ? sta->sta.addr : bcast_addr, ret);
196
197 out_unsupported:
198 switch (key->conf.cipher) {
199 case WLAN_CIPHER_SUITE_WEP40:
200 case WLAN_CIPHER_SUITE_WEP104:
201 case WLAN_CIPHER_SUITE_TKIP:
202 case WLAN_CIPHER_SUITE_CCMP:
203 case WLAN_CIPHER_SUITE_CCMP_256:
204 case WLAN_CIPHER_SUITE_AES_CMAC:
205 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
206 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
207 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
208 case WLAN_CIPHER_SUITE_GCMP:
209 case WLAN_CIPHER_SUITE_GCMP_256:
210 /* all of these we can do in software - if driver can */
211 if (ret == 1)
212 return 0;
213 if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL))
214 return -EINVAL;
215 return 0;
216 default:
217 return -EINVAL;
218 }
219 }
220
ieee80211_key_disable_hw_accel(struct ieee80211_key * key)221 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
222 {
223 struct ieee80211_sub_if_data *sdata;
224 struct sta_info *sta;
225 int ret;
226
227 might_sleep();
228
229 if (!key || !key->local->ops->set_key)
230 return;
231
232 assert_key_lock(key->local);
233
234 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
235 return;
236
237 sta = key->sta;
238 sdata = key->sdata;
239
240 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
241 (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
242 increment_tailroom_need_count(sdata);
243
244 ret = drv_set_key(key->local, DISABLE_KEY, sdata,
245 sta ? &sta->sta : NULL, &key->conf);
246
247 if (ret)
248 sdata_err(sdata,
249 "failed to remove key (%d, %pM) from hardware (%d)\n",
250 key->conf.keyidx,
251 sta ? sta->sta.addr : bcast_addr, ret);
252
253 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
254 }
255
__ieee80211_set_default_key(struct ieee80211_sub_if_data * sdata,int idx,bool uni,bool multi)256 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
257 int idx, bool uni, bool multi)
258 {
259 struct ieee80211_key *key = NULL;
260
261 assert_key_lock(sdata->local);
262
263 if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
264 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
265
266 if (uni) {
267 rcu_assign_pointer(sdata->default_unicast_key, key);
268 ieee80211_check_fast_xmit_iface(sdata);
269 drv_set_default_unicast_key(sdata->local, sdata, idx);
270 }
271
272 if (multi)
273 rcu_assign_pointer(sdata->default_multicast_key, key);
274
275 ieee80211_debugfs_key_update_default(sdata);
276 }
277
ieee80211_set_default_key(struct ieee80211_sub_if_data * sdata,int idx,bool uni,bool multi)278 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
279 bool uni, bool multi)
280 {
281 mutex_lock(&sdata->local->key_mtx);
282 __ieee80211_set_default_key(sdata, idx, uni, multi);
283 mutex_unlock(&sdata->local->key_mtx);
284 }
285
286 static void
__ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data * sdata,int idx)287 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
288 {
289 struct ieee80211_key *key = NULL;
290
291 assert_key_lock(sdata->local);
292
293 if (idx >= NUM_DEFAULT_KEYS &&
294 idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
295 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
296
297 rcu_assign_pointer(sdata->default_mgmt_key, key);
298
299 ieee80211_debugfs_key_update_default(sdata);
300 }
301
ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data * sdata,int idx)302 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
303 int idx)
304 {
305 mutex_lock(&sdata->local->key_mtx);
306 __ieee80211_set_default_mgmt_key(sdata, idx);
307 mutex_unlock(&sdata->local->key_mtx);
308 }
309
310
ieee80211_key_replace(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,bool pairwise,struct ieee80211_key * old,struct ieee80211_key * new)311 static void ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
312 struct sta_info *sta,
313 bool pairwise,
314 struct ieee80211_key *old,
315 struct ieee80211_key *new)
316 {
317 int idx;
318 bool defunikey, defmultikey, defmgmtkey;
319
320 /* caller must provide at least one old/new */
321 if (WARN_ON(!new && !old))
322 return;
323
324 if (new)
325 list_add_tail_rcu(&new->list, &sdata->key_list);
326
327 WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
328
329 if (old)
330 idx = old->conf.keyidx;
331 else
332 idx = new->conf.keyidx;
333
334 if (sta) {
335 if (pairwise) {
336 rcu_assign_pointer(sta->ptk[idx], new);
337 sta->ptk_idx = idx;
338 ieee80211_check_fast_xmit(sta);
339 } else {
340 rcu_assign_pointer(sta->gtk[idx], new);
341 }
342 ieee80211_check_fast_rx(sta);
343 } else {
344 defunikey = old &&
345 old == key_mtx_dereference(sdata->local,
346 sdata->default_unicast_key);
347 defmultikey = old &&
348 old == key_mtx_dereference(sdata->local,
349 sdata->default_multicast_key);
350 defmgmtkey = old &&
351 old == key_mtx_dereference(sdata->local,
352 sdata->default_mgmt_key);
353
354 if (defunikey && !new)
355 __ieee80211_set_default_key(sdata, -1, true, false);
356 if (defmultikey && !new)
357 __ieee80211_set_default_key(sdata, -1, false, true);
358 if (defmgmtkey && !new)
359 __ieee80211_set_default_mgmt_key(sdata, -1);
360
361 rcu_assign_pointer(sdata->keys[idx], new);
362 if (defunikey && new)
363 __ieee80211_set_default_key(sdata, new->conf.keyidx,
364 true, false);
365 if (defmultikey && new)
366 __ieee80211_set_default_key(sdata, new->conf.keyidx,
367 false, true);
368 if (defmgmtkey && new)
369 __ieee80211_set_default_mgmt_key(sdata,
370 new->conf.keyidx);
371 }
372
373 if (old)
374 list_del_rcu(&old->list);
375 }
376
377 struct ieee80211_key *
ieee80211_key_alloc(u32 cipher,int idx,size_t key_len,const u8 * key_data,size_t seq_len,const u8 * seq,const struct ieee80211_cipher_scheme * cs)378 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
379 const u8 *key_data,
380 size_t seq_len, const u8 *seq,
381 const struct ieee80211_cipher_scheme *cs)
382 {
383 struct ieee80211_key *key;
384 int i, j, err;
385
386 if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS))
387 return ERR_PTR(-EINVAL);
388
389 key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
390 if (!key)
391 return ERR_PTR(-ENOMEM);
392
393 /*
394 * Default to software encryption; we'll later upload the
395 * key to the hardware if possible.
396 */
397 key->conf.flags = 0;
398 key->flags = 0;
399
400 key->conf.cipher = cipher;
401 key->conf.keyidx = idx;
402 key->conf.keylen = key_len;
403 switch (cipher) {
404 case WLAN_CIPHER_SUITE_WEP40:
405 case WLAN_CIPHER_SUITE_WEP104:
406 key->conf.iv_len = IEEE80211_WEP_IV_LEN;
407 key->conf.icv_len = IEEE80211_WEP_ICV_LEN;
408 break;
409 case WLAN_CIPHER_SUITE_TKIP:
410 key->conf.iv_len = IEEE80211_TKIP_IV_LEN;
411 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN;
412 if (seq) {
413 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
414 key->u.tkip.rx[i].iv32 =
415 get_unaligned_le32(&seq[2]);
416 key->u.tkip.rx[i].iv16 =
417 get_unaligned_le16(seq);
418 }
419 }
420 spin_lock_init(&key->u.tkip.txlock);
421 break;
422 case WLAN_CIPHER_SUITE_CCMP:
423 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN;
424 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN;
425 if (seq) {
426 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
427 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++)
428 key->u.ccmp.rx_pn[i][j] =
429 seq[IEEE80211_CCMP_PN_LEN - j - 1];
430 }
431 /*
432 * Initialize AES key state here as an optimization so that
433 * it does not need to be initialized for every packet.
434 */
435 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
436 key_data, key_len, IEEE80211_CCMP_MIC_LEN);
437 if (IS_ERR(key->u.ccmp.tfm)) {
438 err = PTR_ERR(key->u.ccmp.tfm);
439 kfree(key);
440 return ERR_PTR(err);
441 }
442 break;
443 case WLAN_CIPHER_SUITE_CCMP_256:
444 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN;
445 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN;
446 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
447 for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++)
448 key->u.ccmp.rx_pn[i][j] =
449 seq[IEEE80211_CCMP_256_PN_LEN - j - 1];
450 /* Initialize AES key state here as an optimization so that
451 * it does not need to be initialized for every packet.
452 */
453 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
454 key_data, key_len, IEEE80211_CCMP_256_MIC_LEN);
455 if (IS_ERR(key->u.ccmp.tfm)) {
456 err = PTR_ERR(key->u.ccmp.tfm);
457 kfree(key);
458 return ERR_PTR(err);
459 }
460 break;
461 case WLAN_CIPHER_SUITE_AES_CMAC:
462 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
463 key->conf.iv_len = 0;
464 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
465 key->conf.icv_len = sizeof(struct ieee80211_mmie);
466 else
467 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
468 if (seq)
469 for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
470 key->u.aes_cmac.rx_pn[j] =
471 seq[IEEE80211_CMAC_PN_LEN - j - 1];
472 /*
473 * Initialize AES key state here as an optimization so that
474 * it does not need to be initialized for every packet.
475 */
476 key->u.aes_cmac.tfm =
477 ieee80211_aes_cmac_key_setup(key_data, key_len);
478 if (IS_ERR(key->u.aes_cmac.tfm)) {
479 err = PTR_ERR(key->u.aes_cmac.tfm);
480 kfree(key);
481 return ERR_PTR(err);
482 }
483 break;
484 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
485 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
486 key->conf.iv_len = 0;
487 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
488 if (seq)
489 for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++)
490 key->u.aes_gmac.rx_pn[j] =
491 seq[IEEE80211_GMAC_PN_LEN - j - 1];
492 /* Initialize AES key state here as an optimization so that
493 * it does not need to be initialized for every packet.
494 */
495 key->u.aes_gmac.tfm =
496 ieee80211_aes_gmac_key_setup(key_data, key_len);
497 if (IS_ERR(key->u.aes_gmac.tfm)) {
498 err = PTR_ERR(key->u.aes_gmac.tfm);
499 kfree(key);
500 return ERR_PTR(err);
501 }
502 break;
503 case WLAN_CIPHER_SUITE_GCMP:
504 case WLAN_CIPHER_SUITE_GCMP_256:
505 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
506 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
507 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
508 for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
509 key->u.gcmp.rx_pn[i][j] =
510 seq[IEEE80211_GCMP_PN_LEN - j - 1];
511 /* Initialize AES key state here as an optimization so that
512 * it does not need to be initialized for every packet.
513 */
514 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
515 key_len);
516 if (IS_ERR(key->u.gcmp.tfm)) {
517 err = PTR_ERR(key->u.gcmp.tfm);
518 kfree(key);
519 return ERR_PTR(err);
520 }
521 break;
522 default:
523 if (cs) {
524 if (seq_len && seq_len != cs->pn_len) {
525 kfree(key);
526 return ERR_PTR(-EINVAL);
527 }
528
529 key->conf.iv_len = cs->hdr_len;
530 key->conf.icv_len = cs->mic_len;
531 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
532 for (j = 0; j < seq_len; j++)
533 key->u.gen.rx_pn[i][j] =
534 seq[seq_len - j - 1];
535 key->flags |= KEY_FLAG_CIPHER_SCHEME;
536 }
537 }
538 memcpy(key->conf.key, key_data, key_len);
539 INIT_LIST_HEAD(&key->list);
540
541 return key;
542 }
543
ieee80211_key_free_common(struct ieee80211_key * key)544 static void ieee80211_key_free_common(struct ieee80211_key *key)
545 {
546 switch (key->conf.cipher) {
547 case WLAN_CIPHER_SUITE_CCMP:
548 case WLAN_CIPHER_SUITE_CCMP_256:
549 ieee80211_aes_key_free(key->u.ccmp.tfm);
550 break;
551 case WLAN_CIPHER_SUITE_AES_CMAC:
552 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
553 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
554 break;
555 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
556 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
557 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm);
558 break;
559 case WLAN_CIPHER_SUITE_GCMP:
560 case WLAN_CIPHER_SUITE_GCMP_256:
561 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
562 break;
563 }
564 kzfree(key);
565 }
566
__ieee80211_key_destroy(struct ieee80211_key * key,bool delay_tailroom)567 static void __ieee80211_key_destroy(struct ieee80211_key *key,
568 bool delay_tailroom)
569 {
570 if (key->local)
571 ieee80211_key_disable_hw_accel(key);
572
573 if (key->local) {
574 struct ieee80211_sub_if_data *sdata = key->sdata;
575
576 ieee80211_debugfs_key_remove(key);
577
578 if (delay_tailroom) {
579 /* see ieee80211_delayed_tailroom_dec */
580 sdata->crypto_tx_tailroom_pending_dec++;
581 schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
582 HZ/2);
583 } else {
584 decrease_tailroom_need_count(sdata, 1);
585 }
586 }
587
588 ieee80211_key_free_common(key);
589 }
590
ieee80211_key_destroy(struct ieee80211_key * key,bool delay_tailroom)591 static void ieee80211_key_destroy(struct ieee80211_key *key,
592 bool delay_tailroom)
593 {
594 if (!key)
595 return;
596
597 /*
598 * Synchronize so the TX path and rcu key iterators
599 * can no longer be using this key before we free/remove it.
600 */
601 synchronize_net();
602
603 __ieee80211_key_destroy(key, delay_tailroom);
604 }
605
ieee80211_key_free_unused(struct ieee80211_key * key)606 void ieee80211_key_free_unused(struct ieee80211_key *key)
607 {
608 WARN_ON(key->sdata || key->local);
609 ieee80211_key_free_common(key);
610 }
611
ieee80211_key_identical(struct ieee80211_sub_if_data * sdata,struct ieee80211_key * old,struct ieee80211_key * new)612 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata,
613 struct ieee80211_key *old,
614 struct ieee80211_key *new)
615 {
616 u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP];
617 u8 *tk_old, *tk_new;
618
619 if (!old || new->conf.keylen != old->conf.keylen)
620 return false;
621
622 tk_old = old->conf.key;
623 tk_new = new->conf.key;
624
625 /*
626 * In station mode, don't compare the TX MIC key, as it's never used
627 * and offloaded rekeying may not care to send it to the host. This
628 * is the case in iwlwifi, for example.
629 */
630 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
631 new->conf.cipher == WLAN_CIPHER_SUITE_TKIP &&
632 new->conf.keylen == WLAN_KEY_LEN_TKIP &&
633 !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
634 memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP);
635 memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP);
636 memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
637 memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
638 tk_old = tkip_old;
639 tk_new = tkip_new;
640 }
641
642 return !crypto_memneq(tk_old, tk_new, new->conf.keylen);
643 }
644
ieee80211_key_link(struct ieee80211_key * key,struct ieee80211_sub_if_data * sdata,struct sta_info * sta)645 int ieee80211_key_link(struct ieee80211_key *key,
646 struct ieee80211_sub_if_data *sdata,
647 struct sta_info *sta)
648 {
649 struct ieee80211_local *local = sdata->local;
650 struct ieee80211_key *old_key;
651 int idx, ret;
652 bool pairwise;
653
654 pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
655 idx = key->conf.keyidx;
656
657 mutex_lock(&sdata->local->key_mtx);
658
659 if (sta && pairwise)
660 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
661 else if (sta)
662 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
663 else
664 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
665
666 /*
667 * Silently accept key re-installation without really installing the
668 * new version of the key to avoid nonce reuse or replay issues.
669 */
670 if (ieee80211_key_identical(sdata, old_key, key)) {
671 ieee80211_key_free_unused(key);
672 ret = 0;
673 goto out;
674 }
675
676 key->local = sdata->local;
677 key->sdata = sdata;
678 key->sta = sta;
679
680 increment_tailroom_need_count(sdata);
681
682 ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
683 ieee80211_key_destroy(old_key, true);
684
685 ieee80211_debugfs_key_add(key);
686
687 if (!local->wowlan) {
688 ret = ieee80211_key_enable_hw_accel(key);
689 if (ret)
690 ieee80211_key_free(key, true);
691 } else {
692 ret = 0;
693 }
694
695 out:
696 mutex_unlock(&sdata->local->key_mtx);
697
698 return ret;
699 }
700
ieee80211_key_free(struct ieee80211_key * key,bool delay_tailroom)701 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
702 {
703 if (!key)
704 return;
705
706 /*
707 * Replace key with nothingness if it was ever used.
708 */
709 if (key->sdata)
710 ieee80211_key_replace(key->sdata, key->sta,
711 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
712 key, NULL);
713 ieee80211_key_destroy(key, delay_tailroom);
714 }
715
ieee80211_enable_keys(struct ieee80211_sub_if_data * sdata)716 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
717 {
718 struct ieee80211_key *key;
719 struct ieee80211_sub_if_data *vlan;
720
721 ASSERT_RTNL();
722
723 if (WARN_ON(!ieee80211_sdata_running(sdata)))
724 return;
725
726 mutex_lock(&sdata->local->key_mtx);
727
728 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
729 sdata->crypto_tx_tailroom_pending_dec);
730
731 if (sdata->vif.type == NL80211_IFTYPE_AP) {
732 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
733 WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
734 vlan->crypto_tx_tailroom_pending_dec);
735 }
736
737 list_for_each_entry(key, &sdata->key_list, list) {
738 increment_tailroom_need_count(sdata);
739 ieee80211_key_enable_hw_accel(key);
740 }
741
742 mutex_unlock(&sdata->local->key_mtx);
743 }
744
ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data * sdata)745 void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata)
746 {
747 struct ieee80211_sub_if_data *vlan;
748
749 mutex_lock(&sdata->local->key_mtx);
750
751 sdata->crypto_tx_tailroom_needed_cnt = 0;
752
753 if (sdata->vif.type == NL80211_IFTYPE_AP) {
754 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
755 vlan->crypto_tx_tailroom_needed_cnt = 0;
756 }
757
758 mutex_unlock(&sdata->local->key_mtx);
759 }
760
ieee80211_iter_keys(struct ieee80211_hw * hw,struct ieee80211_vif * vif,void (* iter)(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_sta * sta,struct ieee80211_key_conf * key,void * data),void * iter_data)761 void ieee80211_iter_keys(struct ieee80211_hw *hw,
762 struct ieee80211_vif *vif,
763 void (*iter)(struct ieee80211_hw *hw,
764 struct ieee80211_vif *vif,
765 struct ieee80211_sta *sta,
766 struct ieee80211_key_conf *key,
767 void *data),
768 void *iter_data)
769 {
770 struct ieee80211_local *local = hw_to_local(hw);
771 struct ieee80211_key *key, *tmp;
772 struct ieee80211_sub_if_data *sdata;
773
774 ASSERT_RTNL();
775
776 mutex_lock(&local->key_mtx);
777 if (vif) {
778 sdata = vif_to_sdata(vif);
779 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
780 iter(hw, &sdata->vif,
781 key->sta ? &key->sta->sta : NULL,
782 &key->conf, iter_data);
783 } else {
784 list_for_each_entry(sdata, &local->interfaces, list)
785 list_for_each_entry_safe(key, tmp,
786 &sdata->key_list, list)
787 iter(hw, &sdata->vif,
788 key->sta ? &key->sta->sta : NULL,
789 &key->conf, iter_data);
790 }
791 mutex_unlock(&local->key_mtx);
792 }
793 EXPORT_SYMBOL(ieee80211_iter_keys);
794
795 static void
_ieee80211_iter_keys_rcu(struct ieee80211_hw * hw,struct ieee80211_sub_if_data * sdata,void (* iter)(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_sta * sta,struct ieee80211_key_conf * key,void * data),void * iter_data)796 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
797 struct ieee80211_sub_if_data *sdata,
798 void (*iter)(struct ieee80211_hw *hw,
799 struct ieee80211_vif *vif,
800 struct ieee80211_sta *sta,
801 struct ieee80211_key_conf *key,
802 void *data),
803 void *iter_data)
804 {
805 struct ieee80211_key *key;
806
807 list_for_each_entry_rcu(key, &sdata->key_list, list) {
808 /* skip keys of station in removal process */
809 if (key->sta && key->sta->removed)
810 continue;
811 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
812 continue;
813
814 iter(hw, &sdata->vif,
815 key->sta ? &key->sta->sta : NULL,
816 &key->conf, iter_data);
817 }
818 }
819
ieee80211_iter_keys_rcu(struct ieee80211_hw * hw,struct ieee80211_vif * vif,void (* iter)(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_sta * sta,struct ieee80211_key_conf * key,void * data),void * iter_data)820 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
821 struct ieee80211_vif *vif,
822 void (*iter)(struct ieee80211_hw *hw,
823 struct ieee80211_vif *vif,
824 struct ieee80211_sta *sta,
825 struct ieee80211_key_conf *key,
826 void *data),
827 void *iter_data)
828 {
829 struct ieee80211_local *local = hw_to_local(hw);
830 struct ieee80211_sub_if_data *sdata;
831
832 if (vif) {
833 sdata = vif_to_sdata(vif);
834 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
835 } else {
836 list_for_each_entry_rcu(sdata, &local->interfaces, list)
837 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
838 }
839 }
840 EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
841
ieee80211_free_keys_iface(struct ieee80211_sub_if_data * sdata,struct list_head * keys)842 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
843 struct list_head *keys)
844 {
845 struct ieee80211_key *key, *tmp;
846
847 decrease_tailroom_need_count(sdata,
848 sdata->crypto_tx_tailroom_pending_dec);
849 sdata->crypto_tx_tailroom_pending_dec = 0;
850
851 ieee80211_debugfs_key_remove_mgmt_default(sdata);
852
853 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
854 ieee80211_key_replace(key->sdata, key->sta,
855 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
856 key, NULL);
857 list_add_tail(&key->list, keys);
858 }
859
860 ieee80211_debugfs_key_update_default(sdata);
861 }
862
ieee80211_free_keys(struct ieee80211_sub_if_data * sdata,bool force_synchronize)863 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
864 bool force_synchronize)
865 {
866 struct ieee80211_local *local = sdata->local;
867 struct ieee80211_sub_if_data *vlan;
868 struct ieee80211_sub_if_data *master;
869 struct ieee80211_key *key, *tmp;
870 LIST_HEAD(keys);
871
872 cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
873
874 mutex_lock(&local->key_mtx);
875
876 ieee80211_free_keys_iface(sdata, &keys);
877
878 if (sdata->vif.type == NL80211_IFTYPE_AP) {
879 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
880 ieee80211_free_keys_iface(vlan, &keys);
881 }
882
883 if (!list_empty(&keys) || force_synchronize)
884 synchronize_net();
885 list_for_each_entry_safe(key, tmp, &keys, list)
886 __ieee80211_key_destroy(key, false);
887
888 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
889 if (sdata->bss) {
890 master = container_of(sdata->bss,
891 struct ieee80211_sub_if_data,
892 u.ap);
893
894 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
895 master->crypto_tx_tailroom_needed_cnt);
896 }
897 } else {
898 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
899 sdata->crypto_tx_tailroom_pending_dec);
900 }
901
902 if (sdata->vif.type == NL80211_IFTYPE_AP) {
903 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
904 WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
905 vlan->crypto_tx_tailroom_pending_dec);
906 }
907
908 mutex_unlock(&local->key_mtx);
909 }
910
ieee80211_free_sta_keys(struct ieee80211_local * local,struct sta_info * sta)911 void ieee80211_free_sta_keys(struct ieee80211_local *local,
912 struct sta_info *sta)
913 {
914 struct ieee80211_key *key;
915 int i;
916
917 mutex_lock(&local->key_mtx);
918 for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) {
919 key = key_mtx_dereference(local, sta->gtk[i]);
920 if (!key)
921 continue;
922 ieee80211_key_replace(key->sdata, key->sta,
923 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
924 key, NULL);
925 __ieee80211_key_destroy(key, true);
926 }
927
928 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
929 key = key_mtx_dereference(local, sta->ptk[i]);
930 if (!key)
931 continue;
932 ieee80211_key_replace(key->sdata, key->sta,
933 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
934 key, NULL);
935 __ieee80211_key_destroy(key, true);
936 }
937
938 mutex_unlock(&local->key_mtx);
939 }
940
ieee80211_delayed_tailroom_dec(struct work_struct * wk)941 void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
942 {
943 struct ieee80211_sub_if_data *sdata;
944
945 sdata = container_of(wk, struct ieee80211_sub_if_data,
946 dec_tailroom_needed_wk.work);
947
948 /*
949 * The reason for the delayed tailroom needed decrementing is to
950 * make roaming faster: during roaming, all keys are first deleted
951 * and then new keys are installed. The first new key causes the
952 * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
953 * the cost of synchronize_net() (which can be slow). Avoid this
954 * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
955 * key removal for a while, so if we roam the value is larger than
956 * zero and no 0->1 transition happens.
957 *
958 * The cost is that if the AP switching was from an AP with keys
959 * to one without, we still allocate tailroom while it would no
960 * longer be needed. However, in the typical (fast) roaming case
961 * within an ESS this usually won't happen.
962 */
963
964 mutex_lock(&sdata->local->key_mtx);
965 decrease_tailroom_need_count(sdata,
966 sdata->crypto_tx_tailroom_pending_dec);
967 sdata->crypto_tx_tailroom_pending_dec = 0;
968 mutex_unlock(&sdata->local->key_mtx);
969 }
970
ieee80211_gtk_rekey_notify(struct ieee80211_vif * vif,const u8 * bssid,const u8 * replay_ctr,gfp_t gfp)971 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
972 const u8 *replay_ctr, gfp_t gfp)
973 {
974 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
975
976 trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
977
978 cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
979 }
980 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
981
ieee80211_get_key_rx_seq(struct ieee80211_key_conf * keyconf,int tid,struct ieee80211_key_seq * seq)982 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
983 int tid, struct ieee80211_key_seq *seq)
984 {
985 struct ieee80211_key *key;
986 const u8 *pn;
987
988 key = container_of(keyconf, struct ieee80211_key, conf);
989
990 switch (key->conf.cipher) {
991 case WLAN_CIPHER_SUITE_TKIP:
992 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
993 return;
994 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
995 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
996 break;
997 case WLAN_CIPHER_SUITE_CCMP:
998 case WLAN_CIPHER_SUITE_CCMP_256:
999 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1000 return;
1001 if (tid < 0)
1002 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1003 else
1004 pn = key->u.ccmp.rx_pn[tid];
1005 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
1006 break;
1007 case WLAN_CIPHER_SUITE_AES_CMAC:
1008 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1009 if (WARN_ON(tid != 0))
1010 return;
1011 pn = key->u.aes_cmac.rx_pn;
1012 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
1013 break;
1014 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1015 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1016 if (WARN_ON(tid != 0))
1017 return;
1018 pn = key->u.aes_gmac.rx_pn;
1019 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
1020 break;
1021 case WLAN_CIPHER_SUITE_GCMP:
1022 case WLAN_CIPHER_SUITE_GCMP_256:
1023 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1024 return;
1025 if (tid < 0)
1026 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1027 else
1028 pn = key->u.gcmp.rx_pn[tid];
1029 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
1030 break;
1031 }
1032 }
1033 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
1034
ieee80211_set_key_rx_seq(struct ieee80211_key_conf * keyconf,int tid,struct ieee80211_key_seq * seq)1035 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1036 int tid, struct ieee80211_key_seq *seq)
1037 {
1038 struct ieee80211_key *key;
1039 u8 *pn;
1040
1041 key = container_of(keyconf, struct ieee80211_key, conf);
1042
1043 switch (key->conf.cipher) {
1044 case WLAN_CIPHER_SUITE_TKIP:
1045 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1046 return;
1047 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1048 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1049 break;
1050 case WLAN_CIPHER_SUITE_CCMP:
1051 case WLAN_CIPHER_SUITE_CCMP_256:
1052 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1053 return;
1054 if (tid < 0)
1055 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1056 else
1057 pn = key->u.ccmp.rx_pn[tid];
1058 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1059 break;
1060 case WLAN_CIPHER_SUITE_AES_CMAC:
1061 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1062 if (WARN_ON(tid != 0))
1063 return;
1064 pn = key->u.aes_cmac.rx_pn;
1065 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1066 break;
1067 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1068 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1069 if (WARN_ON(tid != 0))
1070 return;
1071 pn = key->u.aes_gmac.rx_pn;
1072 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1073 break;
1074 case WLAN_CIPHER_SUITE_GCMP:
1075 case WLAN_CIPHER_SUITE_GCMP_256:
1076 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1077 return;
1078 if (tid < 0)
1079 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1080 else
1081 pn = key->u.gcmp.rx_pn[tid];
1082 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1083 break;
1084 default:
1085 WARN_ON(1);
1086 break;
1087 }
1088 }
1089 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1090
ieee80211_remove_key(struct ieee80211_key_conf * keyconf)1091 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1092 {
1093 struct ieee80211_key *key;
1094
1095 key = container_of(keyconf, struct ieee80211_key, conf);
1096
1097 assert_key_lock(key->local);
1098
1099 /*
1100 * if key was uploaded, we assume the driver will/has remove(d)
1101 * it, so adjust bookkeeping accordingly
1102 */
1103 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1104 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1105
1106 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
1107 (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1108 increment_tailroom_need_count(key->sdata);
1109 }
1110
1111 ieee80211_key_free(key, false);
1112 }
1113 EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1114
1115 struct ieee80211_key_conf *
ieee80211_gtk_rekey_add(struct ieee80211_vif * vif,struct ieee80211_key_conf * keyconf)1116 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1117 struct ieee80211_key_conf *keyconf)
1118 {
1119 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1120 struct ieee80211_local *local = sdata->local;
1121 struct ieee80211_key *key;
1122 int err;
1123
1124 if (WARN_ON(!local->wowlan))
1125 return ERR_PTR(-EINVAL);
1126
1127 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1128 return ERR_PTR(-EINVAL);
1129
1130 key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1131 keyconf->keylen, keyconf->key,
1132 0, NULL, NULL);
1133 if (IS_ERR(key))
1134 return ERR_CAST(key);
1135
1136 if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1137 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1138
1139 err = ieee80211_key_link(key, sdata, NULL);
1140 if (err)
1141 return ERR_PTR(err);
1142
1143 return &key->conf;
1144 }
1145 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);
1146