1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007-2008 Johannes Berg <johannes@sipsolutions.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
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 <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
27
28 /**
29 * DOC: Key handling basics
30 *
31 * Key handling in mac80211 is done based on per-interface (sub_if_data)
32 * keys and per-station keys. Since each station belongs to an interface,
33 * each station key also belongs to that interface.
34 *
35 * Hardware acceleration is done on a best-effort basis for algorithms
36 * that are implemented in software, for each key the hardware is asked
37 * to enable that key for offloading but if it cannot do that the key is
38 * simply kept for software encryption (unless it is for an algorithm
39 * that isn't implemented in software).
40 * There is currently no way of knowing whether a key is handled in SW
41 * or HW except by looking into debugfs.
42 *
43 * All key management is internally protected by a mutex. Within all
44 * other parts of mac80211, key references are, just as STA structure
45 * references, protected by RCU. Note, however, that some things are
46 * unprotected, namely the key->sta dereferences within the hardware
47 * acceleration functions. This means that sta_info_destroy() must
48 * remove the key which waits for an RCU grace period.
49 */
50
51 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
52
assert_key_lock(struct ieee80211_local * local)53 static void assert_key_lock(struct ieee80211_local *local)
54 {
55 lockdep_assert_held(&local->key_mtx);
56 }
57
increment_tailroom_need_count(struct ieee80211_sub_if_data * sdata)58 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
59 {
60 /*
61 * When this count is zero, SKB resizing for allocating tailroom
62 * for IV or MMIC is skipped. But, this check has created two race
63 * cases in xmit path while transiting from zero count to one:
64 *
65 * 1. SKB resize was skipped because no key was added but just before
66 * the xmit key is added and SW encryption kicks off.
67 *
68 * 2. SKB resize was skipped because all the keys were hw planted but
69 * just before xmit one of the key is deleted and SW encryption kicks
70 * off.
71 *
72 * In both the above case SW encryption will find not enough space for
73 * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
74 *
75 * Solution has been explained at
76 * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
77 */
78
79 if (!sdata->crypto_tx_tailroom_needed_cnt++) {
80 /*
81 * Flush all XMIT packets currently using HW encryption or no
82 * encryption at all if the count transition is from 0 -> 1.
83 */
84 synchronize_net();
85 }
86 }
87
ieee80211_key_enable_hw_accel(struct ieee80211_key * key)88 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
89 {
90 struct ieee80211_sub_if_data *sdata;
91 struct sta_info *sta;
92 int ret;
93
94 might_sleep();
95
96 if (!key->local->ops->set_key)
97 goto out_unsupported;
98
99 assert_key_lock(key->local);
100
101 sta = key->sta;
102
103 /*
104 * If this is a per-STA GTK, check if it
105 * is supported; if not, return.
106 */
107 if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) &&
108 !(key->local->hw.flags & IEEE80211_HW_SUPPORTS_PER_STA_GTK))
109 goto out_unsupported;
110
111 if (sta && !sta->uploaded)
112 goto out_unsupported;
113
114 sdata = key->sdata;
115 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
116 /*
117 * The driver doesn't know anything about VLAN interfaces.
118 * Hence, don't send GTKs for VLAN interfaces to the driver.
119 */
120 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE))
121 goto out_unsupported;
122 }
123
124 ret = drv_set_key(key->local, SET_KEY, sdata,
125 sta ? &sta->sta : NULL, &key->conf);
126
127 if (!ret) {
128 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
129
130 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
131 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) ||
132 (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)))
133 sdata->crypto_tx_tailroom_needed_cnt--;
134
135 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
136 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
137
138 return 0;
139 }
140
141 if (ret != -ENOSPC && ret != -EOPNOTSUPP)
142 wiphy_err(key->local->hw.wiphy,
143 "failed to set key (%d, %pM) to hardware (%d)\n",
144 key->conf.keyidx,
145 sta ? sta->sta.addr : bcast_addr, ret);
146
147 out_unsupported:
148 switch (key->conf.cipher) {
149 case WLAN_CIPHER_SUITE_WEP40:
150 case WLAN_CIPHER_SUITE_WEP104:
151 case WLAN_CIPHER_SUITE_TKIP:
152 case WLAN_CIPHER_SUITE_CCMP:
153 case WLAN_CIPHER_SUITE_AES_CMAC:
154 /* all of these we can do in software */
155 return 0;
156 default:
157 return -EINVAL;
158 }
159 }
160
ieee80211_key_disable_hw_accel(struct ieee80211_key * key)161 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
162 {
163 struct ieee80211_sub_if_data *sdata;
164 struct sta_info *sta;
165 int ret;
166
167 might_sleep();
168
169 if (!key || !key->local->ops->set_key)
170 return;
171
172 assert_key_lock(key->local);
173
174 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
175 return;
176
177 sta = key->sta;
178 sdata = key->sdata;
179
180 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
181 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) ||
182 (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)))
183 increment_tailroom_need_count(sdata);
184
185 ret = drv_set_key(key->local, DISABLE_KEY, sdata,
186 sta ? &sta->sta : NULL, &key->conf);
187
188 if (ret)
189 wiphy_err(key->local->hw.wiphy,
190 "failed to remove key (%d, %pM) from hardware (%d)\n",
191 key->conf.keyidx,
192 sta ? sta->sta.addr : bcast_addr, ret);
193
194 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
195 }
196
ieee80211_key_removed(struct ieee80211_key_conf * key_conf)197 void ieee80211_key_removed(struct ieee80211_key_conf *key_conf)
198 {
199 struct ieee80211_key *key;
200
201 key = container_of(key_conf, struct ieee80211_key, conf);
202
203 might_sleep();
204 assert_key_lock(key->local);
205
206 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
207
208 /*
209 * Flush TX path to avoid attempts to use this key
210 * after this function returns. Until then, drivers
211 * must be prepared to handle the key.
212 */
213 synchronize_rcu();
214 }
215 EXPORT_SYMBOL_GPL(ieee80211_key_removed);
216
__ieee80211_set_default_key(struct ieee80211_sub_if_data * sdata,int idx,bool uni,bool multi)217 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
218 int idx, bool uni, bool multi)
219 {
220 struct ieee80211_key *key = NULL;
221
222 assert_key_lock(sdata->local);
223
224 if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
225 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
226
227 if (uni)
228 rcu_assign_pointer(sdata->default_unicast_key, key);
229 if (multi)
230 rcu_assign_pointer(sdata->default_multicast_key, key);
231
232 ieee80211_debugfs_key_update_default(sdata);
233 }
234
ieee80211_set_default_key(struct ieee80211_sub_if_data * sdata,int idx,bool uni,bool multi)235 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
236 bool uni, bool multi)
237 {
238 mutex_lock(&sdata->local->key_mtx);
239 __ieee80211_set_default_key(sdata, idx, uni, multi);
240 mutex_unlock(&sdata->local->key_mtx);
241 }
242
243 static void
__ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data * sdata,int idx)244 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
245 {
246 struct ieee80211_key *key = NULL;
247
248 assert_key_lock(sdata->local);
249
250 if (idx >= NUM_DEFAULT_KEYS &&
251 idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
252 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
253
254 rcu_assign_pointer(sdata->default_mgmt_key, key);
255
256 ieee80211_debugfs_key_update_default(sdata);
257 }
258
ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data * sdata,int idx)259 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
260 int idx)
261 {
262 mutex_lock(&sdata->local->key_mtx);
263 __ieee80211_set_default_mgmt_key(sdata, idx);
264 mutex_unlock(&sdata->local->key_mtx);
265 }
266
267
__ieee80211_key_replace(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,bool pairwise,struct ieee80211_key * old,struct ieee80211_key * new)268 static void __ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
269 struct sta_info *sta,
270 bool pairwise,
271 struct ieee80211_key *old,
272 struct ieee80211_key *new)
273 {
274 int idx;
275 bool defunikey, defmultikey, defmgmtkey;
276
277 if (new)
278 list_add_tail(&new->list, &sdata->key_list);
279
280 if (sta && pairwise) {
281 rcu_assign_pointer(sta->ptk, new);
282 } else if (sta) {
283 if (old)
284 idx = old->conf.keyidx;
285 else
286 idx = new->conf.keyidx;
287 rcu_assign_pointer(sta->gtk[idx], new);
288 } else {
289 WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
290
291 if (old)
292 idx = old->conf.keyidx;
293 else
294 idx = new->conf.keyidx;
295
296 defunikey = old &&
297 old == key_mtx_dereference(sdata->local,
298 sdata->default_unicast_key);
299 defmultikey = old &&
300 old == key_mtx_dereference(sdata->local,
301 sdata->default_multicast_key);
302 defmgmtkey = old &&
303 old == key_mtx_dereference(sdata->local,
304 sdata->default_mgmt_key);
305
306 if (defunikey && !new)
307 __ieee80211_set_default_key(sdata, -1, true, false);
308 if (defmultikey && !new)
309 __ieee80211_set_default_key(sdata, -1, false, true);
310 if (defmgmtkey && !new)
311 __ieee80211_set_default_mgmt_key(sdata, -1);
312
313 rcu_assign_pointer(sdata->keys[idx], new);
314 if (defunikey && new)
315 __ieee80211_set_default_key(sdata, new->conf.keyidx,
316 true, false);
317 if (defmultikey && new)
318 __ieee80211_set_default_key(sdata, new->conf.keyidx,
319 false, true);
320 if (defmgmtkey && new)
321 __ieee80211_set_default_mgmt_key(sdata,
322 new->conf.keyidx);
323 }
324
325 if (old)
326 list_del(&old->list);
327 }
328
ieee80211_key_alloc(u32 cipher,int idx,size_t key_len,const u8 * key_data,size_t seq_len,const u8 * seq)329 struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
330 const u8 *key_data,
331 size_t seq_len, const u8 *seq)
332 {
333 struct ieee80211_key *key;
334 int i, j, err;
335
336 BUG_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS);
337
338 key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
339 if (!key)
340 return ERR_PTR(-ENOMEM);
341
342 /*
343 * Default to software encryption; we'll later upload the
344 * key to the hardware if possible.
345 */
346 key->conf.flags = 0;
347 key->flags = 0;
348
349 key->conf.cipher = cipher;
350 key->conf.keyidx = idx;
351 key->conf.keylen = key_len;
352 switch (cipher) {
353 case WLAN_CIPHER_SUITE_WEP40:
354 case WLAN_CIPHER_SUITE_WEP104:
355 key->conf.iv_len = WEP_IV_LEN;
356 key->conf.icv_len = WEP_ICV_LEN;
357 break;
358 case WLAN_CIPHER_SUITE_TKIP:
359 key->conf.iv_len = TKIP_IV_LEN;
360 key->conf.icv_len = TKIP_ICV_LEN;
361 if (seq) {
362 for (i = 0; i < NUM_RX_DATA_QUEUES; i++) {
363 key->u.tkip.rx[i].iv32 =
364 get_unaligned_le32(&seq[2]);
365 key->u.tkip.rx[i].iv16 =
366 get_unaligned_le16(seq);
367 }
368 }
369 spin_lock_init(&key->u.tkip.txlock);
370 break;
371 case WLAN_CIPHER_SUITE_CCMP:
372 key->conf.iv_len = CCMP_HDR_LEN;
373 key->conf.icv_len = CCMP_MIC_LEN;
374 if (seq) {
375 for (i = 0; i < NUM_RX_DATA_QUEUES + 1; i++)
376 for (j = 0; j < CCMP_PN_LEN; j++)
377 key->u.ccmp.rx_pn[i][j] =
378 seq[CCMP_PN_LEN - j - 1];
379 }
380 /*
381 * Initialize AES key state here as an optimization so that
382 * it does not need to be initialized for every packet.
383 */
384 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(key_data);
385 if (IS_ERR(key->u.ccmp.tfm)) {
386 err = PTR_ERR(key->u.ccmp.tfm);
387 kfree(key);
388 return ERR_PTR(err);
389 }
390 break;
391 case WLAN_CIPHER_SUITE_AES_CMAC:
392 key->conf.iv_len = 0;
393 key->conf.icv_len = sizeof(struct ieee80211_mmie);
394 if (seq)
395 for (j = 0; j < 6; j++)
396 key->u.aes_cmac.rx_pn[j] = seq[6 - j - 1];
397 /*
398 * Initialize AES key state here as an optimization so that
399 * it does not need to be initialized for every packet.
400 */
401 key->u.aes_cmac.tfm =
402 ieee80211_aes_cmac_key_setup(key_data);
403 if (IS_ERR(key->u.aes_cmac.tfm)) {
404 err = PTR_ERR(key->u.aes_cmac.tfm);
405 kfree(key);
406 return ERR_PTR(err);
407 }
408 break;
409 }
410 memcpy(key->conf.key, key_data, key_len);
411 INIT_LIST_HEAD(&key->list);
412
413 return key;
414 }
415
__ieee80211_key_destroy(struct ieee80211_key * key)416 static void __ieee80211_key_destroy(struct ieee80211_key *key)
417 {
418 if (!key)
419 return;
420
421 /*
422 * Synchronize so the TX path can no longer be using
423 * this key before we free/remove it.
424 */
425 synchronize_rcu();
426
427 if (key->local)
428 ieee80211_key_disable_hw_accel(key);
429
430 if (key->conf.cipher == WLAN_CIPHER_SUITE_CCMP)
431 ieee80211_aes_key_free(key->u.ccmp.tfm);
432 if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC)
433 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
434 if (key->local) {
435 ieee80211_debugfs_key_remove(key);
436 key->sdata->crypto_tx_tailroom_needed_cnt--;
437 }
438
439 kfree(key);
440 }
441
ieee80211_key_link(struct ieee80211_key * key,struct ieee80211_sub_if_data * sdata,struct sta_info * sta)442 int ieee80211_key_link(struct ieee80211_key *key,
443 struct ieee80211_sub_if_data *sdata,
444 struct sta_info *sta)
445 {
446 struct ieee80211_key *old_key;
447 int idx, ret;
448 bool pairwise;
449
450 BUG_ON(!sdata);
451 BUG_ON(!key);
452
453 pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
454 idx = key->conf.keyidx;
455 key->local = sdata->local;
456 key->sdata = sdata;
457 key->sta = sta;
458
459 if (sta) {
460 /*
461 * some hardware cannot handle TKIP with QoS, so
462 * we indicate whether QoS could be in use.
463 */
464 if (test_sta_flag(sta, WLAN_STA_WME))
465 key->conf.flags |= IEEE80211_KEY_FLAG_WMM_STA;
466 } else {
467 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
468 struct sta_info *ap;
469
470 /*
471 * We're getting a sta pointer in, so must be under
472 * appropriate locking for sta_info_get().
473 */
474
475 /* same here, the AP could be using QoS */
476 ap = sta_info_get(key->sdata, key->sdata->u.mgd.bssid);
477 if (ap) {
478 if (test_sta_flag(ap, WLAN_STA_WME))
479 key->conf.flags |=
480 IEEE80211_KEY_FLAG_WMM_STA;
481 }
482 }
483 }
484
485 mutex_lock(&sdata->local->key_mtx);
486
487 if (sta && pairwise)
488 old_key = key_mtx_dereference(sdata->local, sta->ptk);
489 else if (sta)
490 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
491 else
492 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
493
494 increment_tailroom_need_count(sdata);
495
496 __ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
497 __ieee80211_key_destroy(old_key);
498
499 ieee80211_debugfs_key_add(key);
500
501 ret = ieee80211_key_enable_hw_accel(key);
502
503 mutex_unlock(&sdata->local->key_mtx);
504
505 return ret;
506 }
507
__ieee80211_key_free(struct ieee80211_key * key)508 void __ieee80211_key_free(struct ieee80211_key *key)
509 {
510 if (!key)
511 return;
512
513 /*
514 * Replace key with nothingness if it was ever used.
515 */
516 if (key->sdata)
517 __ieee80211_key_replace(key->sdata, key->sta,
518 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
519 key, NULL);
520 __ieee80211_key_destroy(key);
521 }
522
ieee80211_key_free(struct ieee80211_local * local,struct ieee80211_key * key)523 void ieee80211_key_free(struct ieee80211_local *local,
524 struct ieee80211_key *key)
525 {
526 mutex_lock(&local->key_mtx);
527 __ieee80211_key_free(key);
528 mutex_unlock(&local->key_mtx);
529 }
530
ieee80211_enable_keys(struct ieee80211_sub_if_data * sdata)531 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
532 {
533 struct ieee80211_key *key;
534
535 ASSERT_RTNL();
536
537 if (WARN_ON(!ieee80211_sdata_running(sdata)))
538 return;
539
540 mutex_lock(&sdata->local->key_mtx);
541
542 sdata->crypto_tx_tailroom_needed_cnt = 0;
543
544 list_for_each_entry(key, &sdata->key_list, list) {
545 increment_tailroom_need_count(sdata);
546 ieee80211_key_enable_hw_accel(key);
547 }
548
549 mutex_unlock(&sdata->local->key_mtx);
550 }
551
ieee80211_iter_keys(struct ieee80211_hw * hw,struct ieee80211_vif * vif,void (* iter)(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_sta * sta,struct ieee80211_key_conf * key,void * data),void * iter_data)552 void ieee80211_iter_keys(struct ieee80211_hw *hw,
553 struct ieee80211_vif *vif,
554 void (*iter)(struct ieee80211_hw *hw,
555 struct ieee80211_vif *vif,
556 struct ieee80211_sta *sta,
557 struct ieee80211_key_conf *key,
558 void *data),
559 void *iter_data)
560 {
561 struct ieee80211_local *local = hw_to_local(hw);
562 struct ieee80211_key *key;
563 struct ieee80211_sub_if_data *sdata;
564
565 ASSERT_RTNL();
566
567 mutex_lock(&local->key_mtx);
568 if (vif) {
569 sdata = vif_to_sdata(vif);
570 list_for_each_entry(key, &sdata->key_list, list)
571 iter(hw, &sdata->vif,
572 key->sta ? &key->sta->sta : NULL,
573 &key->conf, iter_data);
574 } else {
575 list_for_each_entry(sdata, &local->interfaces, list)
576 list_for_each_entry(key, &sdata->key_list, list)
577 iter(hw, &sdata->vif,
578 key->sta ? &key->sta->sta : NULL,
579 &key->conf, iter_data);
580 }
581 mutex_unlock(&local->key_mtx);
582 }
583 EXPORT_SYMBOL(ieee80211_iter_keys);
584
ieee80211_disable_keys(struct ieee80211_sub_if_data * sdata)585 void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata)
586 {
587 struct ieee80211_key *key;
588
589 ASSERT_RTNL();
590
591 mutex_lock(&sdata->local->key_mtx);
592
593 list_for_each_entry(key, &sdata->key_list, list)
594 ieee80211_key_disable_hw_accel(key);
595
596 mutex_unlock(&sdata->local->key_mtx);
597 }
598
ieee80211_free_keys(struct ieee80211_sub_if_data * sdata)599 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata)
600 {
601 struct ieee80211_key *key, *tmp;
602
603 mutex_lock(&sdata->local->key_mtx);
604
605 ieee80211_debugfs_key_remove_mgmt_default(sdata);
606
607 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
608 __ieee80211_key_free(key);
609
610 ieee80211_debugfs_key_update_default(sdata);
611
612 mutex_unlock(&sdata->local->key_mtx);
613 }
614
615
ieee80211_gtk_rekey_notify(struct ieee80211_vif * vif,const u8 * bssid,const u8 * replay_ctr,gfp_t gfp)616 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
617 const u8 *replay_ctr, gfp_t gfp)
618 {
619 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
620
621 trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
622
623 cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
624 }
625 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
626
ieee80211_get_key_tx_seq(struct ieee80211_key_conf * keyconf,struct ieee80211_key_seq * seq)627 void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf,
628 struct ieee80211_key_seq *seq)
629 {
630 struct ieee80211_key *key;
631 u64 pn64;
632
633 if (WARN_ON(!(keyconf->flags & IEEE80211_KEY_FLAG_GENERATE_IV)))
634 return;
635
636 key = container_of(keyconf, struct ieee80211_key, conf);
637
638 switch (key->conf.cipher) {
639 case WLAN_CIPHER_SUITE_TKIP:
640 seq->tkip.iv32 = key->u.tkip.tx.iv32;
641 seq->tkip.iv16 = key->u.tkip.tx.iv16;
642 break;
643 case WLAN_CIPHER_SUITE_CCMP:
644 pn64 = atomic64_read(&key->u.ccmp.tx_pn);
645 seq->ccmp.pn[5] = pn64;
646 seq->ccmp.pn[4] = pn64 >> 8;
647 seq->ccmp.pn[3] = pn64 >> 16;
648 seq->ccmp.pn[2] = pn64 >> 24;
649 seq->ccmp.pn[1] = pn64 >> 32;
650 seq->ccmp.pn[0] = pn64 >> 40;
651 break;
652 case WLAN_CIPHER_SUITE_AES_CMAC:
653 pn64 = atomic64_read(&key->u.aes_cmac.tx_pn);
654 seq->ccmp.pn[5] = pn64;
655 seq->ccmp.pn[4] = pn64 >> 8;
656 seq->ccmp.pn[3] = pn64 >> 16;
657 seq->ccmp.pn[2] = pn64 >> 24;
658 seq->ccmp.pn[1] = pn64 >> 32;
659 seq->ccmp.pn[0] = pn64 >> 40;
660 break;
661 default:
662 WARN_ON(1);
663 }
664 }
665 EXPORT_SYMBOL(ieee80211_get_key_tx_seq);
666
ieee80211_get_key_rx_seq(struct ieee80211_key_conf * keyconf,int tid,struct ieee80211_key_seq * seq)667 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
668 int tid, struct ieee80211_key_seq *seq)
669 {
670 struct ieee80211_key *key;
671 const u8 *pn;
672
673 key = container_of(keyconf, struct ieee80211_key, conf);
674
675 switch (key->conf.cipher) {
676 case WLAN_CIPHER_SUITE_TKIP:
677 if (WARN_ON(tid < 0 || tid >= NUM_RX_DATA_QUEUES))
678 return;
679 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
680 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
681 break;
682 case WLAN_CIPHER_SUITE_CCMP:
683 if (WARN_ON(tid < -1 || tid >= NUM_RX_DATA_QUEUES))
684 return;
685 if (tid < 0)
686 pn = key->u.ccmp.rx_pn[NUM_RX_DATA_QUEUES];
687 else
688 pn = key->u.ccmp.rx_pn[tid];
689 memcpy(seq->ccmp.pn, pn, CCMP_PN_LEN);
690 break;
691 case WLAN_CIPHER_SUITE_AES_CMAC:
692 if (WARN_ON(tid != 0))
693 return;
694 pn = key->u.aes_cmac.rx_pn;
695 memcpy(seq->aes_cmac.pn, pn, CMAC_PN_LEN);
696 break;
697 }
698 }
699 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
700