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TOMOYO Linux Cross Reference
Linux/net/mac80211/key.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * Copyright 2002-2005, Instant802 Networks, Inc.
  4  * Copyright 2005-2006, Devicescape Software, Inc.
  5  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
  6  * Copyright 2007-2008  Johannes Berg <johannes@sipsolutions.net>
  7  * Copyright 2013-2014  Intel Mobile Communications GmbH
  8  * Copyright 2015-2017  Intel Deutschland GmbH
  9  */
 10 
 11 #include <linux/if_ether.h>
 12 #include <linux/etherdevice.h>
 13 #include <linux/list.h>
 14 #include <linux/rcupdate.h>
 15 #include <linux/rtnetlink.h>
 16 #include <linux/slab.h>
 17 #include <linux/export.h>
 18 #include <net/mac80211.h>
 19 #include <crypto/algapi.h>
 20 #include <asm/unaligned.h>
 21 #include "ieee80211_i.h"
 22 #include "driver-ops.h"
 23 #include "debugfs_key.h"
 24 #include "aes_ccm.h"
 25 #include "aes_cmac.h"
 26 #include "aes_gmac.h"
 27 #include "aes_gcm.h"
 28 
 29 
 30 /**
 31  * DOC: Key handling basics
 32  *
 33  * Key handling in mac80211 is done based on per-interface (sub_if_data)
 34  * keys and per-station keys. Since each station belongs to an interface,
 35  * each station key also belongs to that interface.
 36  *
 37  * Hardware acceleration is done on a best-effort basis for algorithms
 38  * that are implemented in software,  for each key the hardware is asked
 39  * to enable that key for offloading but if it cannot do that the key is
 40  * simply kept for software encryption (unless it is for an algorithm
 41  * that isn't implemented in software).
 42  * There is currently no way of knowing whether a key is handled in SW
 43  * or HW except by looking into debugfs.
 44  *
 45  * All key management is internally protected by a mutex. Within all
 46  * other parts of mac80211, key references are, just as STA structure
 47  * references, protected by RCU. Note, however, that some things are
 48  * unprotected, namely the key->sta dereferences within the hardware
 49  * acceleration functions. This means that sta_info_destroy() must
 50  * remove the key which waits for an RCU grace period.
 51  */
 52 
 53 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
 54 
 55 static void assert_key_lock(struct ieee80211_local *local)
 56 {
 57         lockdep_assert_held(&local->key_mtx);
 58 }
 59 
 60 static void
 61 update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta)
 62 {
 63         struct ieee80211_sub_if_data *vlan;
 64 
 65         if (sdata->vif.type != NL80211_IFTYPE_AP)
 66                 return;
 67 
 68         /* crypto_tx_tailroom_needed_cnt is protected by this */
 69         assert_key_lock(sdata->local);
 70 
 71         rcu_read_lock();
 72 
 73         list_for_each_entry_rcu(vlan, &sdata->u.ap.vlans, u.vlan.list)
 74                 vlan->crypto_tx_tailroom_needed_cnt += delta;
 75 
 76         rcu_read_unlock();
 77 }
 78 
 79 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
 80 {
 81         /*
 82          * When this count is zero, SKB resizing for allocating tailroom
 83          * for IV or MMIC is skipped. But, this check has created two race
 84          * cases in xmit path while transiting from zero count to one:
 85          *
 86          * 1. SKB resize was skipped because no key was added but just before
 87          * the xmit key is added and SW encryption kicks off.
 88          *
 89          * 2. SKB resize was skipped because all the keys were hw planted but
 90          * just before xmit one of the key is deleted and SW encryption kicks
 91          * off.
 92          *
 93          * In both the above case SW encryption will find not enough space for
 94          * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
 95          *
 96          * Solution has been explained at
 97          * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
 98          */
 99 
100         assert_key_lock(sdata->local);
101 
102         update_vlan_tailroom_need_count(sdata, 1);
103 
104         if (!sdata->crypto_tx_tailroom_needed_cnt++) {
105                 /*
106                  * Flush all XMIT packets currently using HW encryption or no
107                  * encryption at all if the count transition is from 0 -> 1.
108                  */
109                 synchronize_net();
110         }
111 }
112 
113 static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata,
114                                          int delta)
115 {
116         assert_key_lock(sdata->local);
117 
118         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta);
119 
120         update_vlan_tailroom_need_count(sdata, -delta);
121         sdata->crypto_tx_tailroom_needed_cnt -= delta;
122 }
123 
124 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
125 {
126         struct ieee80211_sub_if_data *sdata = key->sdata;
127         struct sta_info *sta;
128         int ret = -EOPNOTSUPP;
129 
130         might_sleep();
131 
132         if (key->flags & KEY_FLAG_TAINTED) {
133                 /* If we get here, it's during resume and the key is
134                  * tainted so shouldn't be used/programmed any more.
135                  * However, its flags may still indicate that it was
136                  * programmed into the device (since we're in resume)
137                  * so clear that flag now to avoid trying to remove
138                  * it again later.
139                  */
140                 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE &&
141                     !(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
142                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
143                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
144                         increment_tailroom_need_count(sdata);
145 
146                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
147                 return -EINVAL;
148         }
149 
150         if (!key->local->ops->set_key)
151                 goto out_unsupported;
152 
153         assert_key_lock(key->local);
154 
155         sta = key->sta;
156 
157         /*
158          * If this is a per-STA GTK, check if it
159          * is supported; if not, return.
160          */
161         if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) &&
162             !ieee80211_hw_check(&key->local->hw, SUPPORTS_PER_STA_GTK))
163                 goto out_unsupported;
164 
165         if (sta && !sta->uploaded)
166                 goto out_unsupported;
167 
168         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
169                 /*
170                  * The driver doesn't know anything about VLAN interfaces.
171                  * Hence, don't send GTKs for VLAN interfaces to the driver.
172                  */
173                 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
174                         ret = 1;
175                         goto out_unsupported;
176                 }
177         }
178 
179         ret = drv_set_key(key->local, SET_KEY, sdata,
180                           sta ? &sta->sta : NULL, &key->conf);
181 
182         if (!ret) {
183                 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
184 
185                 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
186                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
187                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
188                         decrease_tailroom_need_count(sdata, 1);
189 
190                 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
191                         (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
192 
193                 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) &&
194                         (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC));
195 
196                 return 0;
197         }
198 
199         if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1)
200                 sdata_err(sdata,
201                           "failed to set key (%d, %pM) to hardware (%d)\n",
202                           key->conf.keyidx,
203                           sta ? sta->sta.addr : bcast_addr, ret);
204 
205  out_unsupported:
206         switch (key->conf.cipher) {
207         case WLAN_CIPHER_SUITE_WEP40:
208         case WLAN_CIPHER_SUITE_WEP104:
209         case WLAN_CIPHER_SUITE_TKIP:
210         case WLAN_CIPHER_SUITE_CCMP:
211         case WLAN_CIPHER_SUITE_CCMP_256:
212         case WLAN_CIPHER_SUITE_AES_CMAC:
213         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
214         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
215         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
216         case WLAN_CIPHER_SUITE_GCMP:
217         case WLAN_CIPHER_SUITE_GCMP_256:
218                 /* all of these we can do in software - if driver can */
219                 if (ret == 1)
220                         return 0;
221                 if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL))
222                         return -EINVAL;
223                 return 0;
224         default:
225                 return -EINVAL;
226         }
227 }
228 
229 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
230 {
231         struct ieee80211_sub_if_data *sdata;
232         struct sta_info *sta;
233         int ret;
234 
235         might_sleep();
236 
237         if (!key || !key->local->ops->set_key)
238                 return;
239 
240         assert_key_lock(key->local);
241 
242         if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
243                 return;
244 
245         sta = key->sta;
246         sdata = key->sdata;
247 
248         if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
249                                  IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
250                                  IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
251                 increment_tailroom_need_count(sdata);
252 
253         key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
254         ret = drv_set_key(key->local, DISABLE_KEY, sdata,
255                           sta ? &sta->sta : NULL, &key->conf);
256 
257         if (ret)
258                 sdata_err(sdata,
259                           "failed to remove key (%d, %pM) from hardware (%d)\n",
260                           key->conf.keyidx,
261                           sta ? sta->sta.addr : bcast_addr, ret);
262 }
263 
264 int ieee80211_set_tx_key(struct ieee80211_key *key)
265 {
266         struct sta_info *sta = key->sta;
267         struct ieee80211_local *local = key->local;
268 
269         assert_key_lock(local);
270 
271         sta->ptk_idx = key->conf.keyidx;
272 
273         if (ieee80211_hw_check(&local->hw, NO_AMPDU_KEYBORDER_SUPPORT))
274                 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
275         ieee80211_check_fast_xmit(sta);
276 
277         return 0;
278 }
279 
280 static void ieee80211_pairwise_rekey(struct ieee80211_key *old,
281                                      struct ieee80211_key *new)
282 {
283         struct ieee80211_local *local = new->local;
284         struct sta_info *sta = new->sta;
285         int i;
286 
287         assert_key_lock(local);
288 
289         if (new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX) {
290                 /* Extended Key ID key install, initial one or rekey */
291 
292                 if (sta->ptk_idx != INVALID_PTK_KEYIDX &&
293                     ieee80211_hw_check(&local->hw,
294                                        NO_AMPDU_KEYBORDER_SUPPORT)) {
295                         /* Aggregation Sessions with Extended Key ID must not
296                          * mix MPDUs with different keyIDs within one A-MPDU.
297                          * Tear down any running Tx aggregation and all new
298                          * Rx/Tx aggregation request during rekey if the driver
299                          * asks us to do so. (Blocking Tx only would be
300                          * sufficient but WLAN_STA_BLOCK_BA gets the job done
301                          * for the few ms we need it.)
302                          */
303                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
304                         mutex_lock(&sta->ampdu_mlme.mtx);
305                         for (i = 0; i <  IEEE80211_NUM_TIDS; i++)
306                                 ___ieee80211_stop_tx_ba_session(sta, i,
307                                                                 AGG_STOP_LOCAL_REQUEST);
308                         mutex_unlock(&sta->ampdu_mlme.mtx);
309                 }
310         } else if (old) {
311                 /* Rekey without Extended Key ID.
312                  * Aggregation sessions are OK when running on SW crypto.
313                  * A broken remote STA may cause issues not observed with HW
314                  * crypto, though.
315                  */
316                 if (!(old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
317                         return;
318 
319                 /* Stop Tx till we are on the new key */
320                 old->flags |= KEY_FLAG_TAINTED;
321                 ieee80211_clear_fast_xmit(sta);
322                 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
323                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
324                         ieee80211_sta_tear_down_BA_sessions(sta,
325                                                             AGG_STOP_LOCAL_REQUEST);
326                 }
327                 if (!wiphy_ext_feature_isset(local->hw.wiphy,
328                                              NL80211_EXT_FEATURE_CAN_REPLACE_PTK0)) {
329                         pr_warn_ratelimited("Rekeying PTK for STA %pM but driver can't safely do that.",
330                                             sta->sta.addr);
331                         /* Flushing the driver queues *may* help prevent
332                          * the clear text leaks and freezes.
333                          */
334                         ieee80211_flush_queues(local, old->sdata, false);
335                 }
336         }
337 }
338 
339 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
340                                         int idx, bool uni, bool multi)
341 {
342         struct ieee80211_key *key = NULL;
343 
344         assert_key_lock(sdata->local);
345 
346         if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
347                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
348 
349         if (uni) {
350                 rcu_assign_pointer(sdata->default_unicast_key, key);
351                 ieee80211_check_fast_xmit_iface(sdata);
352                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
353                         drv_set_default_unicast_key(sdata->local, sdata, idx);
354         }
355 
356         if (multi)
357                 rcu_assign_pointer(sdata->default_multicast_key, key);
358 
359         ieee80211_debugfs_key_update_default(sdata);
360 }
361 
362 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
363                                bool uni, bool multi)
364 {
365         mutex_lock(&sdata->local->key_mtx);
366         __ieee80211_set_default_key(sdata, idx, uni, multi);
367         mutex_unlock(&sdata->local->key_mtx);
368 }
369 
370 static void
371 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
372 {
373         struct ieee80211_key *key = NULL;
374 
375         assert_key_lock(sdata->local);
376 
377         if (idx >= NUM_DEFAULT_KEYS &&
378             idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
379                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
380 
381         rcu_assign_pointer(sdata->default_mgmt_key, key);
382 
383         ieee80211_debugfs_key_update_default(sdata);
384 }
385 
386 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
387                                     int idx)
388 {
389         mutex_lock(&sdata->local->key_mtx);
390         __ieee80211_set_default_mgmt_key(sdata, idx);
391         mutex_unlock(&sdata->local->key_mtx);
392 }
393 
394 static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
395                                   struct sta_info *sta,
396                                   bool pairwise,
397                                   struct ieee80211_key *old,
398                                   struct ieee80211_key *new)
399 {
400         int idx;
401         int ret = 0;
402         bool defunikey, defmultikey, defmgmtkey;
403 
404         /* caller must provide at least one old/new */
405         if (WARN_ON(!new && !old))
406                 return 0;
407 
408         if (new)
409                 list_add_tail_rcu(&new->list, &sdata->key_list);
410 
411         WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
412 
413         if (new && sta && pairwise) {
414                 /* Unicast rekey needs special handling. With Extended Key ID
415                  * old is still NULL for the first rekey.
416                  */
417                 ieee80211_pairwise_rekey(old, new);
418         }
419 
420         if (old) {
421                 idx = old->conf.keyidx;
422 
423                 if (old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
424                         ieee80211_key_disable_hw_accel(old);
425 
426                         if (new)
427                                 ret = ieee80211_key_enable_hw_accel(new);
428                 }
429         } else {
430                 /* new must be provided in case old is not */
431                 idx = new->conf.keyidx;
432                 if (!new->local->wowlan)
433                         ret = ieee80211_key_enable_hw_accel(new);
434         }
435 
436         if (ret)
437                 return ret;
438 
439         if (sta) {
440                 if (pairwise) {
441                         rcu_assign_pointer(sta->ptk[idx], new);
442                         if (new &&
443                             !(new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX)) {
444                                 sta->ptk_idx = idx;
445                                 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
446                                 ieee80211_check_fast_xmit(sta);
447                         }
448                 } else {
449                         rcu_assign_pointer(sta->gtk[idx], new);
450                 }
451                 /* Only needed for transition from no key -> key.
452                  * Still triggers unnecessary when using Extended Key ID
453                  * and installing the second key ID the first time.
454                  */
455                 if (new && !old)
456                         ieee80211_check_fast_rx(sta);
457         } else {
458                 defunikey = old &&
459                         old == key_mtx_dereference(sdata->local,
460                                                 sdata->default_unicast_key);
461                 defmultikey = old &&
462                         old == key_mtx_dereference(sdata->local,
463                                                 sdata->default_multicast_key);
464                 defmgmtkey = old &&
465                         old == key_mtx_dereference(sdata->local,
466                                                 sdata->default_mgmt_key);
467 
468                 if (defunikey && !new)
469                         __ieee80211_set_default_key(sdata, -1, true, false);
470                 if (defmultikey && !new)
471                         __ieee80211_set_default_key(sdata, -1, false, true);
472                 if (defmgmtkey && !new)
473                         __ieee80211_set_default_mgmt_key(sdata, -1);
474 
475                 rcu_assign_pointer(sdata->keys[idx], new);
476                 if (defunikey && new)
477                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
478                                                     true, false);
479                 if (defmultikey && new)
480                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
481                                                     false, true);
482                 if (defmgmtkey && new)
483                         __ieee80211_set_default_mgmt_key(sdata,
484                                                          new->conf.keyidx);
485         }
486 
487         if (old)
488                 list_del_rcu(&old->list);
489 
490         return 0;
491 }
492 
493 struct ieee80211_key *
494 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
495                     const u8 *key_data,
496                     size_t seq_len, const u8 *seq,
497                     const struct ieee80211_cipher_scheme *cs)
498 {
499         struct ieee80211_key *key;
500         int i, j, err;
501 
502         if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS))
503                 return ERR_PTR(-EINVAL);
504 
505         key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
506         if (!key)
507                 return ERR_PTR(-ENOMEM);
508 
509         /*
510          * Default to software encryption; we'll later upload the
511          * key to the hardware if possible.
512          */
513         key->conf.flags = 0;
514         key->flags = 0;
515 
516         key->conf.cipher = cipher;
517         key->conf.keyidx = idx;
518         key->conf.keylen = key_len;
519         switch (cipher) {
520         case WLAN_CIPHER_SUITE_WEP40:
521         case WLAN_CIPHER_SUITE_WEP104:
522                 key->conf.iv_len = IEEE80211_WEP_IV_LEN;
523                 key->conf.icv_len = IEEE80211_WEP_ICV_LEN;
524                 break;
525         case WLAN_CIPHER_SUITE_TKIP:
526                 key->conf.iv_len = IEEE80211_TKIP_IV_LEN;
527                 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN;
528                 if (seq) {
529                         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
530                                 key->u.tkip.rx[i].iv32 =
531                                         get_unaligned_le32(&seq[2]);
532                                 key->u.tkip.rx[i].iv16 =
533                                         get_unaligned_le16(seq);
534                         }
535                 }
536                 spin_lock_init(&key->u.tkip.txlock);
537                 break;
538         case WLAN_CIPHER_SUITE_CCMP:
539                 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN;
540                 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN;
541                 if (seq) {
542                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
543                                 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++)
544                                         key->u.ccmp.rx_pn[i][j] =
545                                                 seq[IEEE80211_CCMP_PN_LEN - j - 1];
546                 }
547                 /*
548                  * Initialize AES key state here as an optimization so that
549                  * it does not need to be initialized for every packet.
550                  */
551                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
552                         key_data, key_len, IEEE80211_CCMP_MIC_LEN);
553                 if (IS_ERR(key->u.ccmp.tfm)) {
554                         err = PTR_ERR(key->u.ccmp.tfm);
555                         kfree(key);
556                         return ERR_PTR(err);
557                 }
558                 break;
559         case WLAN_CIPHER_SUITE_CCMP_256:
560                 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN;
561                 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN;
562                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
563                         for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++)
564                                 key->u.ccmp.rx_pn[i][j] =
565                                         seq[IEEE80211_CCMP_256_PN_LEN - j - 1];
566                 /* Initialize AES key state here as an optimization so that
567                  * it does not need to be initialized for every packet.
568                  */
569                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
570                         key_data, key_len, IEEE80211_CCMP_256_MIC_LEN);
571                 if (IS_ERR(key->u.ccmp.tfm)) {
572                         err = PTR_ERR(key->u.ccmp.tfm);
573                         kfree(key);
574                         return ERR_PTR(err);
575                 }
576                 break;
577         case WLAN_CIPHER_SUITE_AES_CMAC:
578         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
579                 key->conf.iv_len = 0;
580                 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
581                         key->conf.icv_len = sizeof(struct ieee80211_mmie);
582                 else
583                         key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
584                 if (seq)
585                         for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
586                                 key->u.aes_cmac.rx_pn[j] =
587                                         seq[IEEE80211_CMAC_PN_LEN - j - 1];
588                 /*
589                  * Initialize AES key state here as an optimization so that
590                  * it does not need to be initialized for every packet.
591                  */
592                 key->u.aes_cmac.tfm =
593                         ieee80211_aes_cmac_key_setup(key_data, key_len);
594                 if (IS_ERR(key->u.aes_cmac.tfm)) {
595                         err = PTR_ERR(key->u.aes_cmac.tfm);
596                         kfree(key);
597                         return ERR_PTR(err);
598                 }
599                 break;
600         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
601         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
602                 key->conf.iv_len = 0;
603                 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
604                 if (seq)
605                         for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++)
606                                 key->u.aes_gmac.rx_pn[j] =
607                                         seq[IEEE80211_GMAC_PN_LEN - j - 1];
608                 /* Initialize AES key state here as an optimization so that
609                  * it does not need to be initialized for every packet.
610                  */
611                 key->u.aes_gmac.tfm =
612                         ieee80211_aes_gmac_key_setup(key_data, key_len);
613                 if (IS_ERR(key->u.aes_gmac.tfm)) {
614                         err = PTR_ERR(key->u.aes_gmac.tfm);
615                         kfree(key);
616                         return ERR_PTR(err);
617                 }
618                 break;
619         case WLAN_CIPHER_SUITE_GCMP:
620         case WLAN_CIPHER_SUITE_GCMP_256:
621                 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
622                 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
623                 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
624                         for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
625                                 key->u.gcmp.rx_pn[i][j] =
626                                         seq[IEEE80211_GCMP_PN_LEN - j - 1];
627                 /* Initialize AES key state here as an optimization so that
628                  * it does not need to be initialized for every packet.
629                  */
630                 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
631                                                                       key_len);
632                 if (IS_ERR(key->u.gcmp.tfm)) {
633                         err = PTR_ERR(key->u.gcmp.tfm);
634                         kfree(key);
635                         return ERR_PTR(err);
636                 }
637                 break;
638         default:
639                 if (cs) {
640                         if (seq_len && seq_len != cs->pn_len) {
641                                 kfree(key);
642                                 return ERR_PTR(-EINVAL);
643                         }
644 
645                         key->conf.iv_len = cs->hdr_len;
646                         key->conf.icv_len = cs->mic_len;
647                         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
648                                 for (j = 0; j < seq_len; j++)
649                                         key->u.gen.rx_pn[i][j] =
650                                                         seq[seq_len - j - 1];
651                         key->flags |= KEY_FLAG_CIPHER_SCHEME;
652                 }
653         }
654         memcpy(key->conf.key, key_data, key_len);
655         INIT_LIST_HEAD(&key->list);
656 
657         return key;
658 }
659 
660 static void ieee80211_key_free_common(struct ieee80211_key *key)
661 {
662         switch (key->conf.cipher) {
663         case WLAN_CIPHER_SUITE_CCMP:
664         case WLAN_CIPHER_SUITE_CCMP_256:
665                 ieee80211_aes_key_free(key->u.ccmp.tfm);
666                 break;
667         case WLAN_CIPHER_SUITE_AES_CMAC:
668         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
669                 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
670                 break;
671         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
672         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
673                 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm);
674                 break;
675         case WLAN_CIPHER_SUITE_GCMP:
676         case WLAN_CIPHER_SUITE_GCMP_256:
677                 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
678                 break;
679         }
680         kzfree(key);
681 }
682 
683 static void __ieee80211_key_destroy(struct ieee80211_key *key,
684                                     bool delay_tailroom)
685 {
686         if (key->local) {
687                 struct ieee80211_sub_if_data *sdata = key->sdata;
688 
689                 ieee80211_debugfs_key_remove(key);
690 
691                 if (delay_tailroom) {
692                         /* see ieee80211_delayed_tailroom_dec */
693                         sdata->crypto_tx_tailroom_pending_dec++;
694                         schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
695                                               HZ/2);
696                 } else {
697                         decrease_tailroom_need_count(sdata, 1);
698                 }
699         }
700 
701         ieee80211_key_free_common(key);
702 }
703 
704 static void ieee80211_key_destroy(struct ieee80211_key *key,
705                                   bool delay_tailroom)
706 {
707         if (!key)
708                 return;
709 
710         /*
711          * Synchronize so the TX path and rcu key iterators
712          * can no longer be using this key before we free/remove it.
713          */
714         synchronize_net();
715 
716         __ieee80211_key_destroy(key, delay_tailroom);
717 }
718 
719 void ieee80211_key_free_unused(struct ieee80211_key *key)
720 {
721         WARN_ON(key->sdata || key->local);
722         ieee80211_key_free_common(key);
723 }
724 
725 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata,
726                                     struct ieee80211_key *old,
727                                     struct ieee80211_key *new)
728 {
729         u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP];
730         u8 *tk_old, *tk_new;
731 
732         if (!old || new->conf.keylen != old->conf.keylen)
733                 return false;
734 
735         tk_old = old->conf.key;
736         tk_new = new->conf.key;
737 
738         /*
739          * In station mode, don't compare the TX MIC key, as it's never used
740          * and offloaded rekeying may not care to send it to the host. This
741          * is the case in iwlwifi, for example.
742          */
743         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
744             new->conf.cipher == WLAN_CIPHER_SUITE_TKIP &&
745             new->conf.keylen == WLAN_KEY_LEN_TKIP &&
746             !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
747                 memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP);
748                 memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP);
749                 memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
750                 memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
751                 tk_old = tkip_old;
752                 tk_new = tkip_new;
753         }
754 
755         return !crypto_memneq(tk_old, tk_new, new->conf.keylen);
756 }
757 
758 int ieee80211_key_link(struct ieee80211_key *key,
759                        struct ieee80211_sub_if_data *sdata,
760                        struct sta_info *sta)
761 {
762         struct ieee80211_key *old_key;
763         int idx = key->conf.keyidx;
764         bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
765         /*
766          * We want to delay tailroom updates only for station - in that
767          * case it helps roaming speed, but in other cases it hurts and
768          * can cause warnings to appear.
769          */
770         bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION;
771         int ret = -EOPNOTSUPP;
772 
773         mutex_lock(&sdata->local->key_mtx);
774 
775         if (sta && pairwise) {
776                 struct ieee80211_key *alt_key;
777 
778                 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
779                 alt_key = key_mtx_dereference(sdata->local, sta->ptk[idx ^ 1]);
780 
781                 /* The rekey code assumes that the old and new key are using
782                  * the same cipher. Enforce the assumption for pairwise keys.
783                  */
784                 if (key &&
785                     ((alt_key && alt_key->conf.cipher != key->conf.cipher) ||
786                      (old_key && old_key->conf.cipher != key->conf.cipher)))
787                         goto out;
788         } else if (sta) {
789                 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
790         } else {
791                 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
792         }
793 
794         /* Non-pairwise keys must also not switch the cipher on rekey */
795         if (!pairwise) {
796                 if (key && old_key && old_key->conf.cipher != key->conf.cipher)
797                         goto out;
798         }
799 
800         /*
801          * Silently accept key re-installation without really installing the
802          * new version of the key to avoid nonce reuse or replay issues.
803          */
804         if (ieee80211_key_identical(sdata, old_key, key)) {
805                 ieee80211_key_free_unused(key);
806                 ret = 0;
807                 goto out;
808         }
809 
810         key->local = sdata->local;
811         key->sdata = sdata;
812         key->sta = sta;
813 
814         increment_tailroom_need_count(sdata);
815 
816         ret = ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
817 
818         if (!ret) {
819                 ieee80211_debugfs_key_add(key);
820                 ieee80211_key_destroy(old_key, delay_tailroom);
821         } else {
822                 ieee80211_key_free(key, delay_tailroom);
823         }
824 
825  out:
826         mutex_unlock(&sdata->local->key_mtx);
827 
828         return ret;
829 }
830 
831 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
832 {
833         if (!key)
834                 return;
835 
836         /*
837          * Replace key with nothingness if it was ever used.
838          */
839         if (key->sdata)
840                 ieee80211_key_replace(key->sdata, key->sta,
841                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
842                                 key, NULL);
843         ieee80211_key_destroy(key, delay_tailroom);
844 }
845 
846 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
847 {
848         struct ieee80211_key *key;
849         struct ieee80211_sub_if_data *vlan;
850 
851         ASSERT_RTNL();
852 
853         if (WARN_ON(!ieee80211_sdata_running(sdata)))
854                 return;
855 
856         mutex_lock(&sdata->local->key_mtx);
857 
858         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
859                      sdata->crypto_tx_tailroom_pending_dec);
860 
861         if (sdata->vif.type == NL80211_IFTYPE_AP) {
862                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
863                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
864                                      vlan->crypto_tx_tailroom_pending_dec);
865         }
866 
867         list_for_each_entry(key, &sdata->key_list, list) {
868                 increment_tailroom_need_count(sdata);
869                 ieee80211_key_enable_hw_accel(key);
870         }
871 
872         mutex_unlock(&sdata->local->key_mtx);
873 }
874 
875 void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata)
876 {
877         struct ieee80211_sub_if_data *vlan;
878 
879         mutex_lock(&sdata->local->key_mtx);
880 
881         sdata->crypto_tx_tailroom_needed_cnt = 0;
882 
883         if (sdata->vif.type == NL80211_IFTYPE_AP) {
884                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
885                         vlan->crypto_tx_tailroom_needed_cnt = 0;
886         }
887 
888         mutex_unlock(&sdata->local->key_mtx);
889 }
890 
891 void ieee80211_iter_keys(struct ieee80211_hw *hw,
892                          struct ieee80211_vif *vif,
893                          void (*iter)(struct ieee80211_hw *hw,
894                                       struct ieee80211_vif *vif,
895                                       struct ieee80211_sta *sta,
896                                       struct ieee80211_key_conf *key,
897                                       void *data),
898                          void *iter_data)
899 {
900         struct ieee80211_local *local = hw_to_local(hw);
901         struct ieee80211_key *key, *tmp;
902         struct ieee80211_sub_if_data *sdata;
903 
904         ASSERT_RTNL();
905 
906         mutex_lock(&local->key_mtx);
907         if (vif) {
908                 sdata = vif_to_sdata(vif);
909                 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
910                         iter(hw, &sdata->vif,
911                              key->sta ? &key->sta->sta : NULL,
912                              &key->conf, iter_data);
913         } else {
914                 list_for_each_entry(sdata, &local->interfaces, list)
915                         list_for_each_entry_safe(key, tmp,
916                                                  &sdata->key_list, list)
917                                 iter(hw, &sdata->vif,
918                                      key->sta ? &key->sta->sta : NULL,
919                                      &key->conf, iter_data);
920         }
921         mutex_unlock(&local->key_mtx);
922 }
923 EXPORT_SYMBOL(ieee80211_iter_keys);
924 
925 static void
926 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
927                          struct ieee80211_sub_if_data *sdata,
928                          void (*iter)(struct ieee80211_hw *hw,
929                                       struct ieee80211_vif *vif,
930                                       struct ieee80211_sta *sta,
931                                       struct ieee80211_key_conf *key,
932                                       void *data),
933                          void *iter_data)
934 {
935         struct ieee80211_key *key;
936 
937         list_for_each_entry_rcu(key, &sdata->key_list, list) {
938                 /* skip keys of station in removal process */
939                 if (key->sta && key->sta->removed)
940                         continue;
941                 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
942                         continue;
943 
944                 iter(hw, &sdata->vif,
945                      key->sta ? &key->sta->sta : NULL,
946                      &key->conf, iter_data);
947         }
948 }
949 
950 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
951                              struct ieee80211_vif *vif,
952                              void (*iter)(struct ieee80211_hw *hw,
953                                           struct ieee80211_vif *vif,
954                                           struct ieee80211_sta *sta,
955                                           struct ieee80211_key_conf *key,
956                                           void *data),
957                              void *iter_data)
958 {
959         struct ieee80211_local *local = hw_to_local(hw);
960         struct ieee80211_sub_if_data *sdata;
961 
962         if (vif) {
963                 sdata = vif_to_sdata(vif);
964                 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
965         } else {
966                 list_for_each_entry_rcu(sdata, &local->interfaces, list)
967                         _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
968         }
969 }
970 EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
971 
972 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
973                                       struct list_head *keys)
974 {
975         struct ieee80211_key *key, *tmp;
976 
977         decrease_tailroom_need_count(sdata,
978                                      sdata->crypto_tx_tailroom_pending_dec);
979         sdata->crypto_tx_tailroom_pending_dec = 0;
980 
981         ieee80211_debugfs_key_remove_mgmt_default(sdata);
982 
983         list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
984                 ieee80211_key_replace(key->sdata, key->sta,
985                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
986                                 key, NULL);
987                 list_add_tail(&key->list, keys);
988         }
989 
990         ieee80211_debugfs_key_update_default(sdata);
991 }
992 
993 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
994                          bool force_synchronize)
995 {
996         struct ieee80211_local *local = sdata->local;
997         struct ieee80211_sub_if_data *vlan;
998         struct ieee80211_sub_if_data *master;
999         struct ieee80211_key *key, *tmp;
1000         LIST_HEAD(keys);
1001 
1002         cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
1003 
1004         mutex_lock(&local->key_mtx);
1005 
1006         ieee80211_free_keys_iface(sdata, &keys);
1007 
1008         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1009                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1010                         ieee80211_free_keys_iface(vlan, &keys);
1011         }
1012 
1013         if (!list_empty(&keys) || force_synchronize)
1014                 synchronize_net();
1015         list_for_each_entry_safe(key, tmp, &keys, list)
1016                 __ieee80211_key_destroy(key, false);
1017 
1018         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1019                 if (sdata->bss) {
1020                         master = container_of(sdata->bss,
1021                                               struct ieee80211_sub_if_data,
1022                                               u.ap);
1023 
1024                         WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
1025                                      master->crypto_tx_tailroom_needed_cnt);
1026                 }
1027         } else {
1028                 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
1029                              sdata->crypto_tx_tailroom_pending_dec);
1030         }
1031 
1032         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1033                 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1034                         WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
1035                                      vlan->crypto_tx_tailroom_pending_dec);
1036         }
1037 
1038         mutex_unlock(&local->key_mtx);
1039 }
1040 
1041 void ieee80211_free_sta_keys(struct ieee80211_local *local,
1042                              struct sta_info *sta)
1043 {
1044         struct ieee80211_key *key;
1045         int i;
1046 
1047         mutex_lock(&local->key_mtx);
1048         for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) {
1049                 key = key_mtx_dereference(local, sta->gtk[i]);
1050                 if (!key)
1051                         continue;
1052                 ieee80211_key_replace(key->sdata, key->sta,
1053                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1054                                 key, NULL);
1055                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1056                                         NL80211_IFTYPE_STATION);
1057         }
1058 
1059         for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1060                 key = key_mtx_dereference(local, sta->ptk[i]);
1061                 if (!key)
1062                         continue;
1063                 ieee80211_key_replace(key->sdata, key->sta,
1064                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1065                                 key, NULL);
1066                 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1067                                         NL80211_IFTYPE_STATION);
1068         }
1069 
1070         mutex_unlock(&local->key_mtx);
1071 }
1072 
1073 void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
1074 {
1075         struct ieee80211_sub_if_data *sdata;
1076 
1077         sdata = container_of(wk, struct ieee80211_sub_if_data,
1078                              dec_tailroom_needed_wk.work);
1079 
1080         /*
1081          * The reason for the delayed tailroom needed decrementing is to
1082          * make roaming faster: during roaming, all keys are first deleted
1083          * and then new keys are installed. The first new key causes the
1084          * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
1085          * the cost of synchronize_net() (which can be slow). Avoid this
1086          * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
1087          * key removal for a while, so if we roam the value is larger than
1088          * zero and no 0->1 transition happens.
1089          *
1090          * The cost is that if the AP switching was from an AP with keys
1091          * to one without, we still allocate tailroom while it would no
1092          * longer be needed. However, in the typical (fast) roaming case
1093          * within an ESS this usually won't happen.
1094          */
1095 
1096         mutex_lock(&sdata->local->key_mtx);
1097         decrease_tailroom_need_count(sdata,
1098                                      sdata->crypto_tx_tailroom_pending_dec);
1099         sdata->crypto_tx_tailroom_pending_dec = 0;
1100         mutex_unlock(&sdata->local->key_mtx);
1101 }
1102 
1103 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
1104                                 const u8 *replay_ctr, gfp_t gfp)
1105 {
1106         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1107 
1108         trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
1109 
1110         cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
1111 }
1112 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
1113 
1114 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
1115                               int tid, struct ieee80211_key_seq *seq)
1116 {
1117         struct ieee80211_key *key;
1118         const u8 *pn;
1119 
1120         key = container_of(keyconf, struct ieee80211_key, conf);
1121 
1122         switch (key->conf.cipher) {
1123         case WLAN_CIPHER_SUITE_TKIP:
1124                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1125                         return;
1126                 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
1127                 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
1128                 break;
1129         case WLAN_CIPHER_SUITE_CCMP:
1130         case WLAN_CIPHER_SUITE_CCMP_256:
1131                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1132                         return;
1133                 if (tid < 0)
1134                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1135                 else
1136                         pn = key->u.ccmp.rx_pn[tid];
1137                 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
1138                 break;
1139         case WLAN_CIPHER_SUITE_AES_CMAC:
1140         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1141                 if (WARN_ON(tid != 0))
1142                         return;
1143                 pn = key->u.aes_cmac.rx_pn;
1144                 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
1145                 break;
1146         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1147         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1148                 if (WARN_ON(tid != 0))
1149                         return;
1150                 pn = key->u.aes_gmac.rx_pn;
1151                 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
1152                 break;
1153         case WLAN_CIPHER_SUITE_GCMP:
1154         case WLAN_CIPHER_SUITE_GCMP_256:
1155                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1156                         return;
1157                 if (tid < 0)
1158                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1159                 else
1160                         pn = key->u.gcmp.rx_pn[tid];
1161                 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
1162                 break;
1163         }
1164 }
1165 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
1166 
1167 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1168                               int tid, struct ieee80211_key_seq *seq)
1169 {
1170         struct ieee80211_key *key;
1171         u8 *pn;
1172 
1173         key = container_of(keyconf, struct ieee80211_key, conf);
1174 
1175         switch (key->conf.cipher) {
1176         case WLAN_CIPHER_SUITE_TKIP:
1177                 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1178                         return;
1179                 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1180                 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1181                 break;
1182         case WLAN_CIPHER_SUITE_CCMP:
1183         case WLAN_CIPHER_SUITE_CCMP_256:
1184                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1185                         return;
1186                 if (tid < 0)
1187                         pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1188                 else
1189                         pn = key->u.ccmp.rx_pn[tid];
1190                 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1191                 break;
1192         case WLAN_CIPHER_SUITE_AES_CMAC:
1193         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1194                 if (WARN_ON(tid != 0))
1195                         return;
1196                 pn = key->u.aes_cmac.rx_pn;
1197                 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1198                 break;
1199         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1200         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1201                 if (WARN_ON(tid != 0))
1202                         return;
1203                 pn = key->u.aes_gmac.rx_pn;
1204                 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1205                 break;
1206         case WLAN_CIPHER_SUITE_GCMP:
1207         case WLAN_CIPHER_SUITE_GCMP_256:
1208                 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1209                         return;
1210                 if (tid < 0)
1211                         pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1212                 else
1213                         pn = key->u.gcmp.rx_pn[tid];
1214                 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1215                 break;
1216         default:
1217                 WARN_ON(1);
1218                 break;
1219         }
1220 }
1221 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1222 
1223 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1224 {
1225         struct ieee80211_key *key;
1226 
1227         key = container_of(keyconf, struct ieee80211_key, conf);
1228 
1229         assert_key_lock(key->local);
1230 
1231         /*
1232          * if key was uploaded, we assume the driver will/has remove(d)
1233          * it, so adjust bookkeeping accordingly
1234          */
1235         if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1236                 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1237 
1238                 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
1239                                          IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
1240                                          IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1241                         increment_tailroom_need_count(key->sdata);
1242         }
1243 
1244         ieee80211_key_free(key, false);
1245 }
1246 EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1247 
1248 struct ieee80211_key_conf *
1249 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1250                         struct ieee80211_key_conf *keyconf)
1251 {
1252         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1253         struct ieee80211_local *local = sdata->local;
1254         struct ieee80211_key *key;
1255         int err;
1256 
1257         if (WARN_ON(!local->wowlan))
1258                 return ERR_PTR(-EINVAL);
1259 
1260         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1261                 return ERR_PTR(-EINVAL);
1262 
1263         key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1264                                   keyconf->keylen, keyconf->key,
1265                                   0, NULL, NULL);
1266         if (IS_ERR(key))
1267                 return ERR_CAST(key);
1268 
1269         if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1270                 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1271 
1272         err = ieee80211_key_link(key, sdata, NULL);
1273         if (err)
1274                 return ERR_PTR(err);
1275 
1276         return &key->conf;
1277 }
1278 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);
1279 

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