Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next
[linux-2.6-microblaze.git] / net / mac80211 / key.c
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
54 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
55
56 static void assert_key_lock(struct ieee80211_local *local)
57 {
58         lockdep_assert_held(&local->key_mtx);
59 }
60
61 static void
62 update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta)
63 {
64         struct ieee80211_sub_if_data *vlan;
65
66         if (sdata->vif.type != NL80211_IFTYPE_AP)
67                 return;
68
69         /* crypto_tx_tailroom_needed_cnt is protected by this */
70         assert_key_lock(sdata->local);
71
72         rcu_read_lock();
73
74         list_for_each_entry_rcu(vlan, &sdata->u.ap.vlans, u.vlan.list)
75                 vlan->crypto_tx_tailroom_needed_cnt += delta;
76
77         rcu_read_unlock();
78 }
79
80 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
81 {
82         /*
83          * When this count is zero, SKB resizing for allocating tailroom
84          * for IV or MMIC is skipped. But, this check has created two race
85          * cases in xmit path while transiting from zero count to one:
86          *
87          * 1. SKB resize was skipped because no key was added but just before
88          * the xmit key is added and SW encryption kicks off.
89          *
90          * 2. SKB resize was skipped because all the keys were hw planted but
91          * just before xmit one of the key is deleted and SW encryption kicks
92          * off.
93          *
94          * In both the above case SW encryption will find not enough space for
95          * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
96          *
97          * Solution has been explained at
98          * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
99          */
100
101         assert_key_lock(sdata->local);
102
103         update_vlan_tailroom_need_count(sdata, 1);
104
105         if (!sdata->crypto_tx_tailroom_needed_cnt++) {
106                 /*
107                  * Flush all XMIT packets currently using HW encryption or no
108                  * encryption at all if the count transition is from 0 -> 1.
109                  */
110                 synchronize_net();
111         }
112 }
113
114 static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata,
115                                          int delta)
116 {
117         assert_key_lock(sdata->local);
118
119         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta);
120
121         update_vlan_tailroom_need_count(sdata, -delta);
122         sdata->crypto_tx_tailroom_needed_cnt -= delta;
123 }
124
125 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
126 {
127         struct ieee80211_sub_if_data *sdata = 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
230 static 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
265 static 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
283 int ieee80211_set_tx_key(struct ieee80211_key *key)
284 {
285         return _ieee80211_set_tx_key(key, false);
286 }
287
288 static 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
347 static 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
370 void 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
378 static 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
394 void 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
402 static 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
419 void 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
427 static 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
531 struct ieee80211_key *
532 ieee80211_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
700 static 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
723 static 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
744 static 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
759 void ieee80211_key_free_unused(struct ieee80211_key *key)
760 {
761         WARN_ON(key->sdata || key->local);
762         ieee80211_key_free_common(key);
763 }
764
765 static 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
798 int ieee80211_key_link(struct ieee80211_key *key,
799                        struct ieee80211_sub_if_data *sdata,
800                        struct sta_info *sta)
801 {
802         struct ieee80211_key *old_key;
803         int idx = key->conf.keyidx;
804         bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
805         /*
806          * We want to delay tailroom updates only for station - in that
807          * case it helps roaming speed, but in other cases it hurts and
808          * can cause warnings to appear.
809          */
810         bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION;
811         int ret = -EOPNOTSUPP;
812
813         mutex_lock(&sdata->local->key_mtx);
814
815         if (sta && pairwise) {
816                 struct ieee80211_key *alt_key;
817
818                 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
819                 alt_key = key_mtx_dereference(sdata->local, sta->ptk[idx ^ 1]);
820
821                 /* The rekey code assumes that the old and new key are using
822                  * the same cipher. Enforce the assumption for pairwise keys.
823                  */
824                 if ((alt_key && alt_key->conf.cipher != key->conf.cipher) ||
825                     (old_key && old_key->conf.cipher != key->conf.cipher))
826                         goto out;
827         } else if (sta) {
828                 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
829         } else {
830                 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
831         }
832
833         /* Non-pairwise keys must also not switch the cipher on rekey */
834         if (!pairwise) {
835                 if (old_key && old_key->conf.cipher != key->conf.cipher)
836                         goto out;
837         }
838
839         /*
840          * Silently accept key re-installation without really installing the
841          * new version of the key to avoid nonce reuse or replay issues.
842          */
843         if (ieee80211_key_identical(sdata, old_key, key)) {
844                 ieee80211_key_free_unused(key);
845                 ret = 0;
846                 goto out;
847         }
848
849         key->local = sdata->local;
850         key->sdata = sdata;
851         key->sta = sta;
852
853         increment_tailroom_need_count(sdata);
854
855         ret = ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
856
857         if (!ret) {
858                 ieee80211_debugfs_key_add(key);
859                 ieee80211_key_destroy(old_key, delay_tailroom);
860         } else {
861                 ieee80211_key_free(key, delay_tailroom);
862         }
863
864  out:
865         mutex_unlock(&sdata->local->key_mtx);
866
867         return ret;
868 }
869
870 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
871 {
872         if (!key)
873                 return;
874
875         /*
876          * Replace key with nothingness if it was ever used.
877          */
878         if (key->sdata)
879                 ieee80211_key_replace(key->sdata, key->sta,
880                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
881                                 key, NULL);
882         ieee80211_key_destroy(key, delay_tailroom);
883 }
884
885 void ieee80211_reenable_keys(struct ieee80211_sub_if_data *sdata)
886 {
887         struct ieee80211_key *key;
888         struct ieee80211_sub_if_data *vlan;
889
890         lockdep_assert_wiphy(sdata->local->hw.wiphy);
891
892         mutex_lock(&sdata->local->key_mtx);
893
894         sdata->crypto_tx_tailroom_needed_cnt = 0;
895         sdata->crypto_tx_tailroom_pending_dec = 0;
896
897         if (sdata->vif.type == NL80211_IFTYPE_AP) {
898                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
899                         vlan->crypto_tx_tailroom_needed_cnt = 0;
900                         vlan->crypto_tx_tailroom_pending_dec = 0;
901                 }
902         }
903
904         if (ieee80211_sdata_running(sdata)) {
905                 list_for_each_entry(key, &sdata->key_list, list) {
906                         increment_tailroom_need_count(sdata);
907                         ieee80211_key_enable_hw_accel(key);
908                 }
909         }
910
911         mutex_unlock(&sdata->local->key_mtx);
912 }
913
914 void ieee80211_iter_keys(struct ieee80211_hw *hw,
915                          struct ieee80211_vif *vif,
916                          void (*iter)(struct ieee80211_hw *hw,
917                                       struct ieee80211_vif *vif,
918                                       struct ieee80211_sta *sta,
919                                       struct ieee80211_key_conf *key,
920                                       void *data),
921                          void *iter_data)
922 {
923         struct ieee80211_local *local = hw_to_local(hw);
924         struct ieee80211_key *key, *tmp;
925         struct ieee80211_sub_if_data *sdata;
926
927         lockdep_assert_wiphy(hw->wiphy);
928
929         mutex_lock(&local->key_mtx);
930         if (vif) {
931                 sdata = vif_to_sdata(vif);
932                 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
933                         iter(hw, &sdata->vif,
934                              key->sta ? &key->sta->sta : NULL,
935                              &key->conf, iter_data);
936         } else {
937                 list_for_each_entry(sdata, &local->interfaces, list)
938                         list_for_each_entry_safe(key, tmp,
939                                                  &sdata->key_list, list)
940                                 iter(hw, &sdata->vif,
941                                      key->sta ? &key->sta->sta : NULL,
942                                      &key->conf, iter_data);
943         }
944         mutex_unlock(&local->key_mtx);
945 }
946 EXPORT_SYMBOL(ieee80211_iter_keys);
947
948 static void
949 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
950                          struct ieee80211_sub_if_data *sdata,
951                          void (*iter)(struct ieee80211_hw *hw,
952                                       struct ieee80211_vif *vif,
953                                       struct ieee80211_sta *sta,
954                                       struct ieee80211_key_conf *key,
955                                       void *data),
956                          void *iter_data)
957 {
958         struct ieee80211_key *key;
959
960         list_for_each_entry_rcu(key, &sdata->key_list, list) {
961                 /* skip keys of station in removal process */
962                 if (key->sta && key->sta->removed)
963                         continue;
964                 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
965                         continue;
966
967                 iter(hw, &sdata->vif,
968                      key->sta ? &key->sta->sta : NULL,
969                      &key->conf, iter_data);
970         }
971 }
972
973 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
974                              struct ieee80211_vif *vif,
975                              void (*iter)(struct ieee80211_hw *hw,
976                                           struct ieee80211_vif *vif,
977                                           struct ieee80211_sta *sta,
978                                           struct ieee80211_key_conf *key,
979                                           void *data),
980                              void *iter_data)
981 {
982         struct ieee80211_local *local = hw_to_local(hw);
983         struct ieee80211_sub_if_data *sdata;
984
985         if (vif) {
986                 sdata = vif_to_sdata(vif);
987                 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
988         } else {
989                 list_for_each_entry_rcu(sdata, &local->interfaces, list)
990                         _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
991         }
992 }
993 EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
994
995 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
996                                       struct list_head *keys)
997 {
998         struct ieee80211_key *key, *tmp;
999
1000         decrease_tailroom_need_count(sdata,
1001                                      sdata->crypto_tx_tailroom_pending_dec);
1002         sdata->crypto_tx_tailroom_pending_dec = 0;
1003
1004         ieee80211_debugfs_key_remove_mgmt_default(sdata);
1005         ieee80211_debugfs_key_remove_beacon_default(sdata);
1006
1007         list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
1008                 ieee80211_key_replace(key->sdata, key->sta,
1009                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1010                                 key, NULL);
1011                 list_add_tail(&key->list, keys);
1012         }
1013
1014         ieee80211_debugfs_key_update_default(sdata);
1015 }
1016
1017 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
1018                          bool force_synchronize)
1019 {
1020         struct ieee80211_local *local = sdata->local;
1021         struct ieee80211_sub_if_data *vlan;
1022         struct ieee80211_sub_if_data *master;
1023         struct ieee80211_key *key, *tmp;
1024         LIST_HEAD(keys);
1025
1026         cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
1027
1028         mutex_lock(&local->key_mtx);
1029
1030         ieee80211_free_keys_iface(sdata, &keys);
1031
1032         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1033                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1034                         ieee80211_free_keys_iface(vlan, &keys);
1035         }
1036
1037         if (!list_empty(&keys) || force_synchronize)
1038                 synchronize_net();
1039         list_for_each_entry_safe(key, tmp, &keys, list)
1040                 __ieee80211_key_destroy(key, false);
1041
1042         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1043                 if (sdata->bss) {
1044                         master = container_of(sdata->bss,
1045                                               struct ieee80211_sub_if_data,
1046                                               u.ap);
1047
1048                         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
1049                                      master->crypto_tx_tailroom_needed_cnt);
1050                 }
1051         } else {
1052                 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
1053                              sdata->crypto_tx_tailroom_pending_dec);
1054         }
1055
1056         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1057                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1058                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
1059                                      vlan->crypto_tx_tailroom_pending_dec);
1060         }
1061
1062         mutex_unlock(&local->key_mtx);
1063 }
1064
1065 void ieee80211_free_sta_keys(struct ieee80211_local *local,
1066                              struct sta_info *sta)
1067 {
1068         struct ieee80211_key *key;
1069         int i;
1070
1071         mutex_lock(&local->key_mtx);
1072         for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) {
1073                 key = key_mtx_dereference(local, sta->gtk[i]);
1074                 if (!key)
1075                         continue;
1076                 ieee80211_key_replace(key->sdata, key->sta,
1077                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1078                                 key, NULL);
1079                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1080                                         NL80211_IFTYPE_STATION);
1081         }
1082
1083         for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1084                 key = key_mtx_dereference(local, sta->ptk[i]);
1085                 if (!key)
1086                         continue;
1087                 ieee80211_key_replace(key->sdata, key->sta,
1088                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1089                                 key, NULL);
1090                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1091                                         NL80211_IFTYPE_STATION);
1092         }
1093
1094         mutex_unlock(&local->key_mtx);
1095 }
1096
1097 void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
1098 {
1099         struct ieee80211_sub_if_data *sdata;
1100
1101         sdata = container_of(wk, struct ieee80211_sub_if_data,
1102                              dec_tailroom_needed_wk.work);
1103
1104         /*
1105          * The reason for the delayed tailroom needed decrementing is to
1106          * make roaming faster: during roaming, all keys are first deleted
1107          * and then new keys are installed. The first new key causes the
1108          * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
1109          * the cost of synchronize_net() (which can be slow). Avoid this
1110          * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
1111          * key removal for a while, so if we roam the value is larger than
1112          * zero and no 0->1 transition happens.
1113          *
1114          * The cost is that if the AP switching was from an AP with keys
1115          * to one without, we still allocate tailroom while it would no
1116          * longer be needed. However, in the typical (fast) roaming case
1117          * within an ESS this usually won't happen.
1118          */
1119
1120         mutex_lock(&sdata->local->key_mtx);
1121         decrease_tailroom_need_count(sdata,
1122                                      sdata->crypto_tx_tailroom_pending_dec);
1123         sdata->crypto_tx_tailroom_pending_dec = 0;
1124         mutex_unlock(&sdata->local->key_mtx);
1125 }
1126
1127 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
1128                                 const u8 *replay_ctr, gfp_t gfp)
1129 {
1130         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1131
1132         trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
1133
1134         cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
1135 }
1136 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
1137
1138 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
1139                               int tid, struct ieee80211_key_seq *seq)
1140 {
1141         struct ieee80211_key *key;
1142         const u8 *pn;
1143
1144         key = container_of(keyconf, struct ieee80211_key, conf);
1145
1146         switch (key->conf.cipher) {
1147         case WLAN_CIPHER_SUITE_TKIP:
1148                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1149                         return;
1150                 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
1151                 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
1152                 break;
1153         case WLAN_CIPHER_SUITE_CCMP:
1154         case WLAN_CIPHER_SUITE_CCMP_256:
1155                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1156                         return;
1157                 if (tid < 0)
1158                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1159                 else
1160                         pn = key->u.ccmp.rx_pn[tid];
1161                 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
1162                 break;
1163         case WLAN_CIPHER_SUITE_AES_CMAC:
1164         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1165                 if (WARN_ON(tid != 0))
1166                         return;
1167                 pn = key->u.aes_cmac.rx_pn;
1168                 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
1169                 break;
1170         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1171         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1172                 if (WARN_ON(tid != 0))
1173                         return;
1174                 pn = key->u.aes_gmac.rx_pn;
1175                 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
1176                 break;
1177         case WLAN_CIPHER_SUITE_GCMP:
1178         case WLAN_CIPHER_SUITE_GCMP_256:
1179                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1180                         return;
1181                 if (tid < 0)
1182                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1183                 else
1184                         pn = key->u.gcmp.rx_pn[tid];
1185                 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
1186                 break;
1187         }
1188 }
1189 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
1190
1191 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1192                               int tid, struct ieee80211_key_seq *seq)
1193 {
1194         struct ieee80211_key *key;
1195         u8 *pn;
1196
1197         key = container_of(keyconf, struct ieee80211_key, conf);
1198
1199         switch (key->conf.cipher) {
1200         case WLAN_CIPHER_SUITE_TKIP:
1201                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1202                         return;
1203                 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1204                 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1205                 break;
1206         case WLAN_CIPHER_SUITE_CCMP:
1207         case WLAN_CIPHER_SUITE_CCMP_256:
1208                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1209                         return;
1210                 if (tid < 0)
1211                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1212                 else
1213                         pn = key->u.ccmp.rx_pn[tid];
1214                 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1215                 break;
1216         case WLAN_CIPHER_SUITE_AES_CMAC:
1217         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1218                 if (WARN_ON(tid != 0))
1219                         return;
1220                 pn = key->u.aes_cmac.rx_pn;
1221                 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1222                 break;
1223         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1224         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1225                 if (WARN_ON(tid != 0))
1226                         return;
1227                 pn = key->u.aes_gmac.rx_pn;
1228                 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1229                 break;
1230         case WLAN_CIPHER_SUITE_GCMP:
1231         case WLAN_CIPHER_SUITE_GCMP_256:
1232                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1233                         return;
1234                 if (tid < 0)
1235                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1236                 else
1237                         pn = key->u.gcmp.rx_pn[tid];
1238                 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1239                 break;
1240         default:
1241                 WARN_ON(1);
1242                 break;
1243         }
1244 }
1245 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1246
1247 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1248 {
1249         struct ieee80211_key *key;
1250
1251         key = container_of(keyconf, struct ieee80211_key, conf);
1252
1253         assert_key_lock(key->local);
1254
1255         /*
1256          * if key was uploaded, we assume the driver will/has remove(d)
1257          * it, so adjust bookkeeping accordingly
1258          */
1259         if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1260                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1261
1262                 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
1263                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
1264                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1265                         increment_tailroom_need_count(key->sdata);
1266         }
1267
1268         ieee80211_key_free(key, false);
1269 }
1270 EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1271
1272 struct ieee80211_key_conf *
1273 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1274                         struct ieee80211_key_conf *keyconf)
1275 {
1276         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1277         struct ieee80211_local *local = sdata->local;
1278         struct ieee80211_key *key;
1279         int err;
1280
1281         if (WARN_ON(!local->wowlan))
1282                 return ERR_PTR(-EINVAL);
1283
1284         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1285                 return ERR_PTR(-EINVAL);
1286
1287         key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1288                                   keyconf->keylen, keyconf->key,
1289                                   0, NULL, NULL);
1290         if (IS_ERR(key))
1291                 return ERR_CAST(key);
1292
1293         if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1294                 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1295
1296         err = ieee80211_key_link(key, sdata, NULL);
1297         if (err)
1298                 return ERR_PTR(err);
1299
1300         return &key->conf;
1301 }
1302 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);
1303
1304 void ieee80211_key_mic_failure(struct ieee80211_key_conf *keyconf)
1305 {
1306         struct ieee80211_key *key;
1307
1308         key = container_of(keyconf, struct ieee80211_key, conf);
1309
1310         switch (key->conf.cipher) {
1311         case WLAN_CIPHER_SUITE_AES_CMAC:
1312         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1313                 key->u.aes_cmac.icverrors++;
1314                 break;
1315         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1316         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1317                 key->u.aes_gmac.icverrors++;
1318                 break;
1319         default:
1320                 /* ignore the others for now, we don't keep counters now */
1321                 break;
1322         }
1323 }
1324 EXPORT_SYMBOL_GPL(ieee80211_key_mic_failure);
1325
1326 void ieee80211_key_replay(struct ieee80211_key_conf *keyconf)
1327 {
1328         struct ieee80211_key *key;
1329
1330         key = container_of(keyconf, struct ieee80211_key, conf);
1331
1332         switch (key->conf.cipher) {
1333         case WLAN_CIPHER_SUITE_CCMP:
1334         case WLAN_CIPHER_SUITE_CCMP_256:
1335                 key->u.ccmp.replays++;
1336                 break;
1337         case WLAN_CIPHER_SUITE_AES_CMAC:
1338         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1339                 key->u.aes_cmac.replays++;
1340                 break;
1341         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1342         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1343                 key->u.aes_gmac.replays++;
1344                 break;
1345         case WLAN_CIPHER_SUITE_GCMP:
1346         case WLAN_CIPHER_SUITE_GCMP_256:
1347                 key->u.gcmp.replays++;
1348                 break;
1349         }
1350 }
1351 EXPORT_SYMBOL_GPL(ieee80211_key_replay);