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Linux 5.1.15
[linux/fpc-iii.git] / net / mac80211 / key.c
blob37e372896230a08c6a9214f88ce54e7ad823d352
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
58 static void assert_key_lock(struct ieee80211_local *local)
59 {
60 lockdep_assert_held(&local->key_mtx);
61 }
62
63 static void
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
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
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
127 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
128 {
129 struct ieee80211_sub_if_data *sdata = key->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 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 ret = 1;
172 goto out_unsupported;
173 }
174 }
175
176 ret = drv_set_key(key->local, SET_KEY, sdata,
177 sta ? &sta->sta : NULL, &key->conf);
178
179 if (!ret) {
180 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
181
182 if (!((key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
183 IEEE80211_KEY_FLAG_PUT_MIC_SPACE)) ||
184 (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
185 decrease_tailroom_need_count(sdata, 1);
186
187 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
188 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
189
190 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) &&
191 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC));
192
193 return 0;
194 }
195
196 if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1)
197 sdata_err(sdata,
198 "failed to set key (%d, %pM) to hardware (%d)\n",
199 key->conf.keyidx,
200 sta ? sta->sta.addr : bcast_addr, ret);
201
202 out_unsupported:
203 switch (key->conf.cipher) {
204 case WLAN_CIPHER_SUITE_WEP40:
205 case WLAN_CIPHER_SUITE_WEP104:
206 case WLAN_CIPHER_SUITE_TKIP:
207 case WLAN_CIPHER_SUITE_CCMP:
208 case WLAN_CIPHER_SUITE_CCMP_256:
209 case WLAN_CIPHER_SUITE_AES_CMAC:
210 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
211 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
212 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
213 case WLAN_CIPHER_SUITE_GCMP:
214 case WLAN_CIPHER_SUITE_GCMP_256:
215 /* all of these we can do in software - if driver can */
216 if (ret == 1)
217 return 0;
218 if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL))
219 return -EINVAL;
220 return 0;
221 default:
222 return -EINVAL;
223 }
224 }
225
226 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
227 {
228 struct ieee80211_sub_if_data *sdata;
229 struct sta_info *sta;
230 int ret;
231
232 might_sleep();
233
234 if (!key || !key->local->ops->set_key)
235 return;
236
237 assert_key_lock(key->local);
238
239 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
240 return;
241
242 sta = key->sta;
243 sdata = key->sdata;
244
245 if (!((key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
246 IEEE80211_KEY_FLAG_PUT_MIC_SPACE)) ||
247 (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
248 increment_tailroom_need_count(sdata);
249
250 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
251 ret = drv_set_key(key->local, DISABLE_KEY, sdata,
252 sta ? &sta->sta : NULL, &key->conf);
253
254 if (ret)
255 sdata_err(sdata,
256 "failed to remove key (%d, %pM) from hardware (%d)\n",
257 key->conf.keyidx,
258 sta ? sta->sta.addr : bcast_addr, ret);
259 }
260
261 static int ieee80211_hw_key_replace(struct ieee80211_key *old_key,
262 struct ieee80211_key *new_key,
263 bool ptk0rekey)
264 {
265 struct ieee80211_sub_if_data *sdata;
266 struct ieee80211_local *local;
267 struct sta_info *sta;
268 int ret;
269
270 /* Aggregation sessions are OK when running on SW crypto.
271 * A broken remote STA may cause issues not observed with HW
272 * crypto, though.
273 */
274 if (!(old_key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
275 return 0;
276
277 assert_key_lock(old_key->local);
278 sta = old_key->sta;
279
280 /* PTK only using key ID 0 needs special handling on rekey */
281 if (new_key && sta && ptk0rekey) {
282 local = old_key->local;
283 sdata = old_key->sdata;
284
285 /* Stop TX till we are on the new key */
286 old_key->flags |= KEY_FLAG_TAINTED;
287 ieee80211_clear_fast_xmit(sta);
288
289 /* Aggregation sessions during rekey are complicated due to the
290 * reorder buffer and retransmits. Side step that by blocking
291 * aggregation during rekey and tear down running sessions.
292 */
293 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
294 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
295 ieee80211_sta_tear_down_BA_sessions(sta,
296 AGG_STOP_LOCAL_REQUEST);
297 }
298
299 if (!wiphy_ext_feature_isset(local->hw.wiphy,
300 NL80211_EXT_FEATURE_CAN_REPLACE_PTK0)) {
301 pr_warn_ratelimited("Rekeying PTK for STA %pM but driver can't safely do that.",
302 sta->sta.addr);
303 /* Flushing the driver queues *may* help prevent
304 * the clear text leaks and freezes.
305 */
306 ieee80211_flush_queues(local, sdata, false);
307 }
308 }
309
310 ieee80211_key_disable_hw_accel(old_key);
311
312 if (new_key)
313 ret = ieee80211_key_enable_hw_accel(new_key);
314 else
315 ret = 0;
316
317 return ret;
318 }
319
320 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
321 int idx, bool uni, bool multi)
322 {
323 struct ieee80211_key *key = NULL;
324
325 assert_key_lock(sdata->local);
326
327 if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
328 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
329
330 if (uni) {
331 rcu_assign_pointer(sdata->default_unicast_key, key);
332 ieee80211_check_fast_xmit_iface(sdata);
333 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
334 drv_set_default_unicast_key(sdata->local, sdata, idx);
335 }
336
337 if (multi)
338 rcu_assign_pointer(sdata->default_multicast_key, key);
339
340 ieee80211_debugfs_key_update_default(sdata);
341 }
342
343 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
344 bool uni, bool multi)
345 {
346 mutex_lock(&sdata->local->key_mtx);
347 __ieee80211_set_default_key(sdata, idx, uni, multi);
348 mutex_unlock(&sdata->local->key_mtx);
349 }
350
351 static void
352 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
353 {
354 struct ieee80211_key *key = NULL;
355
356 assert_key_lock(sdata->local);
357
358 if (idx >= NUM_DEFAULT_KEYS &&
359 idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
360 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
361
362 rcu_assign_pointer(sdata->default_mgmt_key, key);
363
364 ieee80211_debugfs_key_update_default(sdata);
365 }
366
367 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
368 int idx)
369 {
370 mutex_lock(&sdata->local->key_mtx);
371 __ieee80211_set_default_mgmt_key(sdata, idx);
372 mutex_unlock(&sdata->local->key_mtx);
373 }
374
375
376 static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
377 struct sta_info *sta,
378 bool pairwise,
379 struct ieee80211_key *old,
380 struct ieee80211_key *new)
381 {
382 int idx;
383 int ret;
384 bool defunikey, defmultikey, defmgmtkey;
385
386 /* caller must provide at least one old/new */
387 if (WARN_ON(!new && !old))
388 return 0;
389
390 if (new)
391 list_add_tail_rcu(&new->list, &sdata->key_list);
392
393 WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
394
395 if (old) {
396 idx = old->conf.keyidx;
397 /* TODO: proper implement and test "Extended Key ID for
398 * Individually Addressed Frames" from IEEE 802.11-2016.
399 * Till then always assume only key ID 0 is used for
400 * pairwise keys.*/
401 ret = ieee80211_hw_key_replace(old, new, pairwise);
402 } else {
403 /* new must be provided in case old is not */
404 idx = new->conf.keyidx;
405 if (!new->local->wowlan)
406 ret = ieee80211_key_enable_hw_accel(new);
407 else
408 ret = 0;
409 }
410
411 if (ret)
412 return ret;
413
414 if (sta) {
415 if (pairwise) {
416 rcu_assign_pointer(sta->ptk[idx], new);
417 sta->ptk_idx = idx;
418 if (new) {
419 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
420 ieee80211_check_fast_xmit(sta);
421 }
422 } else {
423 rcu_assign_pointer(sta->gtk[idx], new);
424 }
425 if (new)
426 ieee80211_check_fast_rx(sta);
427 } else {
428 defunikey = old &&
429 old == key_mtx_dereference(sdata->local,
430 sdata->default_unicast_key);
431 defmultikey = old &&
432 old == key_mtx_dereference(sdata->local,
433 sdata->default_multicast_key);
434 defmgmtkey = old &&
435 old == key_mtx_dereference(sdata->local,
436 sdata->default_mgmt_key);
437
438 if (defunikey && !new)
439 __ieee80211_set_default_key(sdata, -1, true, false);
440 if (defmultikey && !new)
441 __ieee80211_set_default_key(sdata, -1, false, true);
442 if (defmgmtkey && !new)
443 __ieee80211_set_default_mgmt_key(sdata, -1);
444
445 rcu_assign_pointer(sdata->keys[idx], new);
446 if (defunikey && new)
447 __ieee80211_set_default_key(sdata, new->conf.keyidx,
448 true, false);
449 if (defmultikey && new)
450 __ieee80211_set_default_key(sdata, new->conf.keyidx,
451 false, true);
452 if (defmgmtkey && new)
453 __ieee80211_set_default_mgmt_key(sdata,
454 new->conf.keyidx);
455 }
456
457 if (old)
458 list_del_rcu(&old->list);
459
460 return 0;
461 }
462
463 struct ieee80211_key *
464 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
465 const u8 *key_data,
466 size_t seq_len, const u8 *seq,
467 const struct ieee80211_cipher_scheme *cs)
468 {
469 struct ieee80211_key *key;
470 int i, j, err;
471
472 if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS))
473 return ERR_PTR(-EINVAL);
474
475 key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
476 if (!key)
477 return ERR_PTR(-ENOMEM);
478
479 /*
480 * Default to software encryption; we'll later upload the
481 * key to the hardware if possible.
482 */
483 key->conf.flags = 0;
484 key->flags = 0;
485
486 key->conf.cipher = cipher;
487 key->conf.keyidx = idx;
488 key->conf.keylen = key_len;
489 switch (cipher) {
490 case WLAN_CIPHER_SUITE_WEP40:
491 case WLAN_CIPHER_SUITE_WEP104:
492 key->conf.iv_len = IEEE80211_WEP_IV_LEN;
493 key->conf.icv_len = IEEE80211_WEP_ICV_LEN;
494 break;
495 case WLAN_CIPHER_SUITE_TKIP:
496 key->conf.iv_len = IEEE80211_TKIP_IV_LEN;
497 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN;
498 if (seq) {
499 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
500 key->u.tkip.rx[i].iv32 =
501 get_unaligned_le32(&seq[2]);
502 key->u.tkip.rx[i].iv16 =
503 get_unaligned_le16(seq);
504 }
505 }
506 spin_lock_init(&key->u.tkip.txlock);
507 break;
508 case WLAN_CIPHER_SUITE_CCMP:
509 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN;
510 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN;
511 if (seq) {
512 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
513 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++)
514 key->u.ccmp.rx_pn[i][j] =
515 seq[IEEE80211_CCMP_PN_LEN - j - 1];
516 }
517 /*
518 * Initialize AES key state here as an optimization so that
519 * it does not need to be initialized for every packet.
520 */
521 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
522 key_data, key_len, IEEE80211_CCMP_MIC_LEN);
523 if (IS_ERR(key->u.ccmp.tfm)) {
524 err = PTR_ERR(key->u.ccmp.tfm);
525 kfree(key);
526 return ERR_PTR(err);
527 }
528 break;
529 case WLAN_CIPHER_SUITE_CCMP_256:
530 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN;
531 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN;
532 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
533 for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++)
534 key->u.ccmp.rx_pn[i][j] =
535 seq[IEEE80211_CCMP_256_PN_LEN - j - 1];
536 /* Initialize AES key state here as an optimization so that
537 * it does not need to be initialized for every packet.
538 */
539 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
540 key_data, key_len, IEEE80211_CCMP_256_MIC_LEN);
541 if (IS_ERR(key->u.ccmp.tfm)) {
542 err = PTR_ERR(key->u.ccmp.tfm);
543 kfree(key);
544 return ERR_PTR(err);
545 }
546 break;
547 case WLAN_CIPHER_SUITE_AES_CMAC:
548 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
549 key->conf.iv_len = 0;
550 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
551 key->conf.icv_len = sizeof(struct ieee80211_mmie);
552 else
553 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
554 if (seq)
555 for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
556 key->u.aes_cmac.rx_pn[j] =
557 seq[IEEE80211_CMAC_PN_LEN - j - 1];
558 /*
559 * Initialize AES key state here as an optimization so that
560 * it does not need to be initialized for every packet.
561 */
562 key->u.aes_cmac.tfm =
563 ieee80211_aes_cmac_key_setup(key_data, key_len);
564 if (IS_ERR(key->u.aes_cmac.tfm)) {
565 err = PTR_ERR(key->u.aes_cmac.tfm);
566 kfree(key);
567 return ERR_PTR(err);
568 }
569 break;
570 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
571 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
572 key->conf.iv_len = 0;
573 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
574 if (seq)
575 for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++)
576 key->u.aes_gmac.rx_pn[j] =
577 seq[IEEE80211_GMAC_PN_LEN - j - 1];
578 /* Initialize AES key state here as an optimization so that
579 * it does not need to be initialized for every packet.
580 */
581 key->u.aes_gmac.tfm =
582 ieee80211_aes_gmac_key_setup(key_data, key_len);
583 if (IS_ERR(key->u.aes_gmac.tfm)) {
584 err = PTR_ERR(key->u.aes_gmac.tfm);
585 kfree(key);
586 return ERR_PTR(err);
587 }
588 break;
589 case WLAN_CIPHER_SUITE_GCMP:
590 case WLAN_CIPHER_SUITE_GCMP_256:
591 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
592 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
593 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
594 for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
595 key->u.gcmp.rx_pn[i][j] =
596 seq[IEEE80211_GCMP_PN_LEN - j - 1];
597 /* Initialize AES key state here as an optimization so that
598 * it does not need to be initialized for every packet.
599 */
600 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
601 key_len);
602 if (IS_ERR(key->u.gcmp.tfm)) {
603 err = PTR_ERR(key->u.gcmp.tfm);
604 kfree(key);
605 return ERR_PTR(err);
606 }
607 break;
608 default:
609 if (cs) {
610 if (seq_len && seq_len != cs->pn_len) {
611 kfree(key);
612 return ERR_PTR(-EINVAL);
613 }
614
615 key->conf.iv_len = cs->hdr_len;
616 key->conf.icv_len = cs->mic_len;
617 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
618 for (j = 0; j < seq_len; j++)
619 key->u.gen.rx_pn[i][j] =
620 seq[seq_len - j - 1];
621 key->flags |= KEY_FLAG_CIPHER_SCHEME;
622 }
623 }
624 memcpy(key->conf.key, key_data, key_len);
625 INIT_LIST_HEAD(&key->list);
626
627 return key;
628 }
629
630 static void ieee80211_key_free_common(struct ieee80211_key *key)
631 {
632 switch (key->conf.cipher) {
633 case WLAN_CIPHER_SUITE_CCMP:
634 case WLAN_CIPHER_SUITE_CCMP_256:
635 ieee80211_aes_key_free(key->u.ccmp.tfm);
636 break;
637 case WLAN_CIPHER_SUITE_AES_CMAC:
638 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
639 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
640 break;
641 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
642 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
643 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm);
644 break;
645 case WLAN_CIPHER_SUITE_GCMP:
646 case WLAN_CIPHER_SUITE_GCMP_256:
647 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
648 break;
649 }
650 kzfree(key);
651 }
652
653 static void __ieee80211_key_destroy(struct ieee80211_key *key,
654 bool delay_tailroom)
655 {
656 if (key->local) {
657 struct ieee80211_sub_if_data *sdata = key->sdata;
658
659 ieee80211_debugfs_key_remove(key);
660
661 if (delay_tailroom) {
662 /* see ieee80211_delayed_tailroom_dec */
663 sdata->crypto_tx_tailroom_pending_dec++;
664 schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
665 HZ/2);
666 } else {
667 decrease_tailroom_need_count(sdata, 1);
668 }
669 }
670
671 ieee80211_key_free_common(key);
672 }
673
674 static void ieee80211_key_destroy(struct ieee80211_key *key,
675 bool delay_tailroom)
676 {
677 if (!key)
678 return;
679
680 /*
681 * Synchronize so the TX path and rcu key iterators
682 * can no longer be using this key before we free/remove it.
683 */
684 synchronize_net();
685
686 __ieee80211_key_destroy(key, delay_tailroom);
687 }
688
689 void ieee80211_key_free_unused(struct ieee80211_key *key)
690 {
691 WARN_ON(key->sdata || key->local);
692 ieee80211_key_free_common(key);
693 }
694
695 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata,
696 struct ieee80211_key *old,
697 struct ieee80211_key *new)
698 {
699 u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP];
700 u8 *tk_old, *tk_new;
701
702 if (!old || new->conf.keylen != old->conf.keylen)
703 return false;
704
705 tk_old = old->conf.key;
706 tk_new = new->conf.key;
707
708 /*
709 * In station mode, don't compare the TX MIC key, as it's never used
710 * and offloaded rekeying may not care to send it to the host. This
711 * is the case in iwlwifi, for example.
712 */
713 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
714 new->conf.cipher == WLAN_CIPHER_SUITE_TKIP &&
715 new->conf.keylen == WLAN_KEY_LEN_TKIP &&
716 !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
717 memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP);
718 memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP);
719 memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
720 memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
721 tk_old = tkip_old;
722 tk_new = tkip_new;
723 }
724
725 return !crypto_memneq(tk_old, tk_new, new->conf.keylen);
726 }
727
728 int ieee80211_key_link(struct ieee80211_key *key,
729 struct ieee80211_sub_if_data *sdata,
730 struct sta_info *sta)
731 {
732 struct ieee80211_key *old_key;
733 int idx = key->conf.keyidx;
734 bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
735 /*
736 * We want to delay tailroom updates only for station - in that
737 * case it helps roaming speed, but in other cases it hurts and
738 * can cause warnings to appear.
739 */
740 bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION;
741 int ret;
742
743 mutex_lock(&sdata->local->key_mtx);
744
745 if (sta && pairwise)
746 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
747 else if (sta)
748 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
749 else
750 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
751
752 /*
753 * Silently accept key re-installation without really installing the
754 * new version of the key to avoid nonce reuse or replay issues.
755 */
756 if (ieee80211_key_identical(sdata, old_key, key)) {
757 ieee80211_key_free_unused(key);
758 ret = 0;
759 goto out;
760 }
761
762 key->local = sdata->local;
763 key->sdata = sdata;
764 key->sta = sta;
765
766 increment_tailroom_need_count(sdata);
767
768 ret = ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
769
770 if (!ret) {
771 ieee80211_debugfs_key_add(key);
772 ieee80211_key_destroy(old_key, delay_tailroom);
773 } else {
774 ieee80211_key_free(key, delay_tailroom);
775 }
776
777 out:
778 mutex_unlock(&sdata->local->key_mtx);
779
780 return ret;
781 }
782
783 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
784 {
785 if (!key)
786 return;
787
788 /*
789 * Replace key with nothingness if it was ever used.
790 */
791 if (key->sdata)
792 ieee80211_key_replace(key->sdata, key->sta,
793 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
794 key, NULL);
795 ieee80211_key_destroy(key, delay_tailroom);
796 }
797
798 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
799 {
800 struct ieee80211_key *key;
801 struct ieee80211_sub_if_data *vlan;
802
803 ASSERT_RTNL();
804
805 if (WARN_ON(!ieee80211_sdata_running(sdata)))
806 return;
807
808 mutex_lock(&sdata->local->key_mtx);
809
810 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
811 sdata->crypto_tx_tailroom_pending_dec);
812
813 if (sdata->vif.type == NL80211_IFTYPE_AP) {
814 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
815 WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
816 vlan->crypto_tx_tailroom_pending_dec);
817 }
818
819 list_for_each_entry(key, &sdata->key_list, list) {
820 increment_tailroom_need_count(sdata);
821 ieee80211_key_enable_hw_accel(key);
822 }
823
824 mutex_unlock(&sdata->local->key_mtx);
825 }
826
827 void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata)
828 {
829 struct ieee80211_sub_if_data *vlan;
830
831 mutex_lock(&sdata->local->key_mtx);
832
833 sdata->crypto_tx_tailroom_needed_cnt = 0;
834
835 if (sdata->vif.type == NL80211_IFTYPE_AP) {
836 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
837 vlan->crypto_tx_tailroom_needed_cnt = 0;
838 }
839
840 mutex_unlock(&sdata->local->key_mtx);
841 }
842
843 void ieee80211_iter_keys(struct ieee80211_hw *hw,
844 struct ieee80211_vif *vif,
845 void (*iter)(struct ieee80211_hw *hw,
846 struct ieee80211_vif *vif,
847 struct ieee80211_sta *sta,
848 struct ieee80211_key_conf *key,
849 void *data),
850 void *iter_data)
851 {
852 struct ieee80211_local *local = hw_to_local(hw);
853 struct ieee80211_key *key, *tmp;
854 struct ieee80211_sub_if_data *sdata;
855
856 ASSERT_RTNL();
857
858 mutex_lock(&local->key_mtx);
859 if (vif) {
860 sdata = vif_to_sdata(vif);
861 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
862 iter(hw, &sdata->vif,
863 key->sta ? &key->sta->sta : NULL,
864 &key->conf, iter_data);
865 } else {
866 list_for_each_entry(sdata, &local->interfaces, list)
867 list_for_each_entry_safe(key, tmp,
868 &sdata->key_list, list)
869 iter(hw, &sdata->vif,
870 key->sta ? &key->sta->sta : NULL,
871 &key->conf, iter_data);
872 }
873 mutex_unlock(&local->key_mtx);
874 }
875 EXPORT_SYMBOL(ieee80211_iter_keys);
876
877 static void
878 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
879 struct ieee80211_sub_if_data *sdata,
880 void (*iter)(struct ieee80211_hw *hw,
881 struct ieee80211_vif *vif,
882 struct ieee80211_sta *sta,
883 struct ieee80211_key_conf *key,
884 void *data),
885 void *iter_data)
886 {
887 struct ieee80211_key *key;
888
889 list_for_each_entry_rcu(key, &sdata->key_list, list) {
890 /* skip keys of station in removal process */
891 if (key->sta && key->sta->removed)
892 continue;
893 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
894 continue;
895
896 iter(hw, &sdata->vif,
897 key->sta ? &key->sta->sta : NULL,
898 &key->conf, iter_data);
899 }
900 }
901
902 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
903 struct ieee80211_vif *vif,
904 void (*iter)(struct ieee80211_hw *hw,
905 struct ieee80211_vif *vif,
906 struct ieee80211_sta *sta,
907 struct ieee80211_key_conf *key,
908 void *data),
909 void *iter_data)
910 {
911 struct ieee80211_local *local = hw_to_local(hw);
912 struct ieee80211_sub_if_data *sdata;
913
914 if (vif) {
915 sdata = vif_to_sdata(vif);
916 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
917 } else {
918 list_for_each_entry_rcu(sdata, &local->interfaces, list)
919 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
920 }
921 }
922 EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
923
924 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
925 struct list_head *keys)
926 {
927 struct ieee80211_key *key, *tmp;
928
929 decrease_tailroom_need_count(sdata,
930 sdata->crypto_tx_tailroom_pending_dec);
931 sdata->crypto_tx_tailroom_pending_dec = 0;
932
933 ieee80211_debugfs_key_remove_mgmt_default(sdata);
934
935 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
936 ieee80211_key_replace(key->sdata, key->sta,
937 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
938 key, NULL);
939 list_add_tail(&key->list, keys);
940 }
941
942 ieee80211_debugfs_key_update_default(sdata);
943 }
944
945 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
946 bool force_synchronize)
947 {
948 struct ieee80211_local *local = sdata->local;
949 struct ieee80211_sub_if_data *vlan;
950 struct ieee80211_sub_if_data *master;
951 struct ieee80211_key *key, *tmp;
952 LIST_HEAD(keys);
953
954 cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
955
956 mutex_lock(&local->key_mtx);
957
958 ieee80211_free_keys_iface(sdata, &keys);
959
960 if (sdata->vif.type == NL80211_IFTYPE_AP) {
961 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
962 ieee80211_free_keys_iface(vlan, &keys);
963 }
964
965 if (!list_empty(&keys) || force_synchronize)
966 synchronize_net();
967 list_for_each_entry_safe(key, tmp, &keys, list)
968 __ieee80211_key_destroy(key, false);
969
970 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
971 if (sdata->bss) {
972 master = container_of(sdata->bss,
973 struct ieee80211_sub_if_data,
974 u.ap);
975
976 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
977 master->crypto_tx_tailroom_needed_cnt);
978 }
979 } else {
980 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
981 sdata->crypto_tx_tailroom_pending_dec);
982 }
983
984 if (sdata->vif.type == NL80211_IFTYPE_AP) {
985 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
986 WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
987 vlan->crypto_tx_tailroom_pending_dec);
988 }
989
990 mutex_unlock(&local->key_mtx);
991 }
992
993 void ieee80211_free_sta_keys(struct ieee80211_local *local,
994 struct sta_info *sta)
995 {
996 struct ieee80211_key *key;
997 int i;
998
999 mutex_lock(&local->key_mtx);
1000 for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) {
1001 key = key_mtx_dereference(local, sta->gtk[i]);
1002 if (!key)
1003 continue;
1004 ieee80211_key_replace(key->sdata, key->sta,
1005 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1006 key, NULL);
1007 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1008 NL80211_IFTYPE_STATION);
1009 }
1010
1011 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1012 key = key_mtx_dereference(local, sta->ptk[i]);
1013 if (!key)
1014 continue;
1015 ieee80211_key_replace(key->sdata, key->sta,
1016 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1017 key, NULL);
1018 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1019 NL80211_IFTYPE_STATION);
1020 }
1021
1022 mutex_unlock(&local->key_mtx);
1023 }
1024
1025 void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
1026 {
1027 struct ieee80211_sub_if_data *sdata;
1028
1029 sdata = container_of(wk, struct ieee80211_sub_if_data,
1030 dec_tailroom_needed_wk.work);
1031
1032 /*
1033 * The reason for the delayed tailroom needed decrementing is to
1034 * make roaming faster: during roaming, all keys are first deleted
1035 * and then new keys are installed. The first new key causes the
1036 * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
1037 * the cost of synchronize_net() (which can be slow). Avoid this
1038 * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
1039 * key removal for a while, so if we roam the value is larger than
1040 * zero and no 0->1 transition happens.
1041 *
1042 * The cost is that if the AP switching was from an AP with keys
1043 * to one without, we still allocate tailroom while it would no
1044 * longer be needed. However, in the typical (fast) roaming case
1045 * within an ESS this usually won't happen.
1046 */
1047
1048 mutex_lock(&sdata->local->key_mtx);
1049 decrease_tailroom_need_count(sdata,
1050 sdata->crypto_tx_tailroom_pending_dec);
1051 sdata->crypto_tx_tailroom_pending_dec = 0;
1052 mutex_unlock(&sdata->local->key_mtx);
1053 }
1054
1055 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
1056 const u8 *replay_ctr, gfp_t gfp)
1057 {
1058 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1059
1060 trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
1061
1062 cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
1063 }
1064 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
1065
1066 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
1067 int tid, struct ieee80211_key_seq *seq)
1068 {
1069 struct ieee80211_key *key;
1070 const u8 *pn;
1071
1072 key = container_of(keyconf, struct ieee80211_key, conf);
1073
1074 switch (key->conf.cipher) {
1075 case WLAN_CIPHER_SUITE_TKIP:
1076 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1077 return;
1078 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
1079 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
1080 break;
1081 case WLAN_CIPHER_SUITE_CCMP:
1082 case WLAN_CIPHER_SUITE_CCMP_256:
1083 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1084 return;
1085 if (tid < 0)
1086 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1087 else
1088 pn = key->u.ccmp.rx_pn[tid];
1089 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
1090 break;
1091 case WLAN_CIPHER_SUITE_AES_CMAC:
1092 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1093 if (WARN_ON(tid != 0))
1094 return;
1095 pn = key->u.aes_cmac.rx_pn;
1096 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
1097 break;
1098 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1099 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1100 if (WARN_ON(tid != 0))
1101 return;
1102 pn = key->u.aes_gmac.rx_pn;
1103 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
1104 break;
1105 case WLAN_CIPHER_SUITE_GCMP:
1106 case WLAN_CIPHER_SUITE_GCMP_256:
1107 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1108 return;
1109 if (tid < 0)
1110 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1111 else
1112 pn = key->u.gcmp.rx_pn[tid];
1113 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
1114 break;
1115 }
1116 }
1117 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
1118
1119 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1120 int tid, struct ieee80211_key_seq *seq)
1121 {
1122 struct ieee80211_key *key;
1123 u8 *pn;
1124
1125 key = container_of(keyconf, struct ieee80211_key, conf);
1126
1127 switch (key->conf.cipher) {
1128 case WLAN_CIPHER_SUITE_TKIP:
1129 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1130 return;
1131 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1132 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1133 break;
1134 case WLAN_CIPHER_SUITE_CCMP:
1135 case WLAN_CIPHER_SUITE_CCMP_256:
1136 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1137 return;
1138 if (tid < 0)
1139 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1140 else
1141 pn = key->u.ccmp.rx_pn[tid];
1142 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1143 break;
1144 case WLAN_CIPHER_SUITE_AES_CMAC:
1145 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1146 if (WARN_ON(tid != 0))
1147 return;
1148 pn = key->u.aes_cmac.rx_pn;
1149 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1150 break;
1151 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1152 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1153 if (WARN_ON(tid != 0))
1154 return;
1155 pn = key->u.aes_gmac.rx_pn;
1156 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1157 break;
1158 case WLAN_CIPHER_SUITE_GCMP:
1159 case WLAN_CIPHER_SUITE_GCMP_256:
1160 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1161 return;
1162 if (tid < 0)
1163 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1164 else
1165 pn = key->u.gcmp.rx_pn[tid];
1166 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1167 break;
1168 default:
1169 WARN_ON(1);
1170 break;
1171 }
1172 }
1173 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1174
1175 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1176 {
1177 struct ieee80211_key *key;
1178
1179 key = container_of(keyconf, struct ieee80211_key, conf);
1180
1181 assert_key_lock(key->local);
1182
1183 /*
1184 * if key was uploaded, we assume the driver will/has remove(d)
1185 * it, so adjust bookkeeping accordingly
1186 */
1187 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1188 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1189
1190 if (!((key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
1191 IEEE80211_KEY_FLAG_PUT_MIC_SPACE)) ||
1192 (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1193 increment_tailroom_need_count(key->sdata);
1194 }
1195
1196 ieee80211_key_free(key, false);
1197 }
1198 EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1199
1200 struct ieee80211_key_conf *
1201 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1202 struct ieee80211_key_conf *keyconf)
1203 {
1204 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1205 struct ieee80211_local *local = sdata->local;
1206 struct ieee80211_key *key;
1207 int err;
1208
1209 if (WARN_ON(!local->wowlan))
1210 return ERR_PTR(-EINVAL);
1211
1212 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1213 return ERR_PTR(-EINVAL);
1214
1215 key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1216 keyconf->keylen, keyconf->key,
1217 0, NULL, NULL);
1218 if (IS_ERR(key))
1219 return ERR_CAST(key);
1220
1221 if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1222 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1223
1224 err = ieee80211_key_link(key, sdata, NULL);
1225 if (err)
1226 return ERR_PTR(err);
1227
1228 return &key->conf;
1229 }
1230 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);
Linux with added FPC-III support