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
assert_key_lock(struct ieee80211_local * local)56 static void assert_key_lock(struct ieee80211_local *local)
57 {
58 lockdep_assert_held(&local->key_mtx);
59 }
60
61 static void
update_vlan_tailroom_need_count(struct ieee80211_sub_if_data * sdata,int delta)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
increment_tailroom_need_count(struct ieee80211_sub_if_data * sdata)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
decrease_tailroom_need_count(struct ieee80211_sub_if_data * sdata,int delta)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
ieee80211_key_enable_hw_accel(struct ieee80211_key * key)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
ieee80211_key_disable_hw_accel(struct ieee80211_key * key)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
_ieee80211_set_tx_key(struct ieee80211_key * key,bool force)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
ieee80211_set_tx_key(struct ieee80211_key * key)283 int ieee80211_set_tx_key(struct ieee80211_key *key)
284 {
285 return _ieee80211_set_tx_key(key, false);
286 }
287
ieee80211_pairwise_rekey(struct ieee80211_key * old,struct ieee80211_key * new)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
__ieee80211_set_default_key(struct ieee80211_sub_if_data * sdata,int idx,bool uni,bool multi)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
ieee80211_set_default_key(struct ieee80211_sub_if_data * sdata,int idx,bool uni,bool multi)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
__ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data * sdata,int idx)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
ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data * sdata,int idx)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
__ieee80211_set_default_beacon_key(struct ieee80211_sub_if_data * sdata,int idx)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
ieee80211_set_default_beacon_key(struct ieee80211_sub_if_data * sdata,int idx)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
ieee80211_key_replace(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,bool pairwise,struct ieee80211_key * old,struct ieee80211_key * new)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 *
ieee80211_key_alloc(u32 cipher,int idx,size_t key_len,const u8 * key_data,size_t seq_len,const u8 * seq,const struct ieee80211_cipher_scheme * cs)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
ieee80211_key_free_common(struct ieee80211_key * key)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
__ieee80211_key_destroy(struct ieee80211_key * key,bool delay_tailroom)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
ieee80211_key_destroy(struct ieee80211_key * key,bool delay_tailroom)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
ieee80211_key_free_unused(struct ieee80211_key * key)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
ieee80211_key_identical(struct ieee80211_sub_if_data * sdata,struct ieee80211_key * old,struct ieee80211_key * new)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
ieee80211_key_link(struct ieee80211_key * key,struct ieee80211_sub_if_data * sdata,struct sta_info * sta)798 int ieee80211_key_link(struct ieee80211_key *key,
799 struct ieee80211_sub_if_data *sdata,
800 struct sta_info *sta)
801 {
802 static atomic_t key_color = ATOMIC_INIT(0);
803 struct ieee80211_key *old_key;
804 int idx = key->conf.keyidx;
805 bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
806 /*
807 * We want to delay tailroom updates only for station - in that
808 * case it helps roaming speed, but in other cases it hurts and
809 * can cause warnings to appear.
810 */
811 bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION;
812 int ret = -EOPNOTSUPP;
813
814 mutex_lock(&sdata->local->key_mtx);
815
816 if (sta && pairwise) {
817 struct ieee80211_key *alt_key;
818
819 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
820 alt_key = key_mtx_dereference(sdata->local, sta->ptk[idx ^ 1]);
821
822 /* The rekey code assumes that the old and new key are using
823 * the same cipher. Enforce the assumption for pairwise keys.
824 */
825 if ((alt_key && alt_key->conf.cipher != key->conf.cipher) ||
826 (old_key && old_key->conf.cipher != key->conf.cipher))
827 goto out;
828 } else if (sta) {
829 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
830 } else {
831 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
832 }
833
834 /* Non-pairwise keys must also not switch the cipher on rekey */
835 if (!pairwise) {
836 if (old_key && old_key->conf.cipher != key->conf.cipher)
837 goto out;
838 }
839
840 /*
841 * Silently accept key re-installation without really installing the
842 * new version of the key to avoid nonce reuse or replay issues.
843 */
844 if (ieee80211_key_identical(sdata, old_key, key)) {
845 ieee80211_key_free_unused(key);
846 ret = 0;
847 goto out;
848 }
849
850 key->local = sdata->local;
851 key->sdata = sdata;
852 key->sta = sta;
853
854 /*
855 * Assign a unique ID to every key so we can easily prevent mixed
856 * key and fragment cache attacks.
857 */
858 key->color = atomic_inc_return(&key_color);
859
860 increment_tailroom_need_count(sdata);
861
862 ret = ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
863
864 if (!ret) {
865 ieee80211_debugfs_key_add(key);
866 ieee80211_key_destroy(old_key, delay_tailroom);
867 } else {
868 ieee80211_key_free(key, delay_tailroom);
869 }
870
871 out:
872 mutex_unlock(&sdata->local->key_mtx);
873
874 return ret;
875 }
876
ieee80211_key_free(struct ieee80211_key * key,bool delay_tailroom)877 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
878 {
879 if (!key)
880 return;
881
882 /*
883 * Replace key with nothingness if it was ever used.
884 */
885 if (key->sdata)
886 ieee80211_key_replace(key->sdata, key->sta,
887 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
888 key, NULL);
889 ieee80211_key_destroy(key, delay_tailroom);
890 }
891
ieee80211_reenable_keys(struct ieee80211_sub_if_data * sdata)892 void ieee80211_reenable_keys(struct ieee80211_sub_if_data *sdata)
893 {
894 struct ieee80211_key *key;
895 struct ieee80211_sub_if_data *vlan;
896
897 lockdep_assert_wiphy(sdata->local->hw.wiphy);
898
899 mutex_lock(&sdata->local->key_mtx);
900
901 sdata->crypto_tx_tailroom_needed_cnt = 0;
902 sdata->crypto_tx_tailroom_pending_dec = 0;
903
904 if (sdata->vif.type == NL80211_IFTYPE_AP) {
905 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
906 vlan->crypto_tx_tailroom_needed_cnt = 0;
907 vlan->crypto_tx_tailroom_pending_dec = 0;
908 }
909 }
910
911 if (ieee80211_sdata_running(sdata)) {
912 list_for_each_entry(key, &sdata->key_list, list) {
913 increment_tailroom_need_count(sdata);
914 ieee80211_key_enable_hw_accel(key);
915 }
916 }
917
918 mutex_unlock(&sdata->local->key_mtx);
919 }
920
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)921 void ieee80211_iter_keys(struct ieee80211_hw *hw,
922 struct ieee80211_vif *vif,
923 void (*iter)(struct ieee80211_hw *hw,
924 struct ieee80211_vif *vif,
925 struct ieee80211_sta *sta,
926 struct ieee80211_key_conf *key,
927 void *data),
928 void *iter_data)
929 {
930 struct ieee80211_local *local = hw_to_local(hw);
931 struct ieee80211_key *key, *tmp;
932 struct ieee80211_sub_if_data *sdata;
933
934 lockdep_assert_wiphy(hw->wiphy);
935
936 mutex_lock(&local->key_mtx);
937 if (vif) {
938 sdata = vif_to_sdata(vif);
939 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
940 iter(hw, &sdata->vif,
941 key->sta ? &key->sta->sta : NULL,
942 &key->conf, iter_data);
943 } else {
944 list_for_each_entry(sdata, &local->interfaces, list)
945 list_for_each_entry_safe(key, tmp,
946 &sdata->key_list, list)
947 iter(hw, &sdata->vif,
948 key->sta ? &key->sta->sta : NULL,
949 &key->conf, iter_data);
950 }
951 mutex_unlock(&local->key_mtx);
952 }
953 EXPORT_SYMBOL(ieee80211_iter_keys);
954
955 static void
_ieee80211_iter_keys_rcu(struct ieee80211_hw * hw,struct ieee80211_sub_if_data * sdata,void (* iter)(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_sta * sta,struct ieee80211_key_conf * key,void * data),void * iter_data)956 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
957 struct ieee80211_sub_if_data *sdata,
958 void (*iter)(struct ieee80211_hw *hw,
959 struct ieee80211_vif *vif,
960 struct ieee80211_sta *sta,
961 struct ieee80211_key_conf *key,
962 void *data),
963 void *iter_data)
964 {
965 struct ieee80211_key *key;
966
967 list_for_each_entry_rcu(key, &sdata->key_list, list) {
968 /* skip keys of station in removal process */
969 if (key->sta && key->sta->removed)
970 continue;
971 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
972 continue;
973
974 iter(hw, &sdata->vif,
975 key->sta ? &key->sta->sta : NULL,
976 &key->conf, iter_data);
977 }
978 }
979
ieee80211_iter_keys_rcu(struct ieee80211_hw * hw,struct ieee80211_vif * vif,void (* iter)(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_sta * sta,struct ieee80211_key_conf * key,void * data),void * iter_data)980 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
981 struct ieee80211_vif *vif,
982 void (*iter)(struct ieee80211_hw *hw,
983 struct ieee80211_vif *vif,
984 struct ieee80211_sta *sta,
985 struct ieee80211_key_conf *key,
986 void *data),
987 void *iter_data)
988 {
989 struct ieee80211_local *local = hw_to_local(hw);
990 struct ieee80211_sub_if_data *sdata;
991
992 if (vif) {
993 sdata = vif_to_sdata(vif);
994 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
995 } else {
996 list_for_each_entry_rcu(sdata, &local->interfaces, list)
997 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
998 }
999 }
1000 EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
1001
ieee80211_free_keys_iface(struct ieee80211_sub_if_data * sdata,struct list_head * keys)1002 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
1003 struct list_head *keys)
1004 {
1005 struct ieee80211_key *key, *tmp;
1006
1007 decrease_tailroom_need_count(sdata,
1008 sdata->crypto_tx_tailroom_pending_dec);
1009 sdata->crypto_tx_tailroom_pending_dec = 0;
1010
1011 ieee80211_debugfs_key_remove_mgmt_default(sdata);
1012 ieee80211_debugfs_key_remove_beacon_default(sdata);
1013
1014 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
1015 ieee80211_key_replace(key->sdata, key->sta,
1016 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1017 key, NULL);
1018 list_add_tail(&key->list, keys);
1019 }
1020
1021 ieee80211_debugfs_key_update_default(sdata);
1022 }
1023
ieee80211_free_keys(struct ieee80211_sub_if_data * sdata,bool force_synchronize)1024 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
1025 bool force_synchronize)
1026 {
1027 struct ieee80211_local *local = sdata->local;
1028 struct ieee80211_sub_if_data *vlan;
1029 struct ieee80211_sub_if_data *master;
1030 struct ieee80211_key *key, *tmp;
1031 LIST_HEAD(keys);
1032
1033 cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
1034
1035 mutex_lock(&local->key_mtx);
1036
1037 ieee80211_free_keys_iface(sdata, &keys);
1038
1039 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1040 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1041 ieee80211_free_keys_iface(vlan, &keys);
1042 }
1043
1044 if (!list_empty(&keys) || force_synchronize)
1045 synchronize_net();
1046 list_for_each_entry_safe(key, tmp, &keys, list)
1047 __ieee80211_key_destroy(key, false);
1048
1049 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1050 if (sdata->bss) {
1051 master = container_of(sdata->bss,
1052 struct ieee80211_sub_if_data,
1053 u.ap);
1054
1055 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
1056 master->crypto_tx_tailroom_needed_cnt);
1057 }
1058 } else {
1059 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
1060 sdata->crypto_tx_tailroom_pending_dec);
1061 }
1062
1063 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1064 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1065 WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
1066 vlan->crypto_tx_tailroom_pending_dec);
1067 }
1068
1069 mutex_unlock(&local->key_mtx);
1070 }
1071
ieee80211_free_sta_keys(struct ieee80211_local * local,struct sta_info * sta)1072 void ieee80211_free_sta_keys(struct ieee80211_local *local,
1073 struct sta_info *sta)
1074 {
1075 struct ieee80211_key *key;
1076 int i;
1077
1078 mutex_lock(&local->key_mtx);
1079 for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) {
1080 key = key_mtx_dereference(local, sta->gtk[i]);
1081 if (!key)
1082 continue;
1083 ieee80211_key_replace(key->sdata, key->sta,
1084 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1085 key, NULL);
1086 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1087 NL80211_IFTYPE_STATION);
1088 }
1089
1090 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1091 key = key_mtx_dereference(local, sta->ptk[i]);
1092 if (!key)
1093 continue;
1094 ieee80211_key_replace(key->sdata, key->sta,
1095 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1096 key, NULL);
1097 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1098 NL80211_IFTYPE_STATION);
1099 }
1100
1101 mutex_unlock(&local->key_mtx);
1102 }
1103
ieee80211_delayed_tailroom_dec(struct work_struct * wk)1104 void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
1105 {
1106 struct ieee80211_sub_if_data *sdata;
1107
1108 sdata = container_of(wk, struct ieee80211_sub_if_data,
1109 dec_tailroom_needed_wk.work);
1110
1111 /*
1112 * The reason for the delayed tailroom needed decrementing is to
1113 * make roaming faster: during roaming, all keys are first deleted
1114 * and then new keys are installed. The first new key causes the
1115 * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
1116 * the cost of synchronize_net() (which can be slow). Avoid this
1117 * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
1118 * key removal for a while, so if we roam the value is larger than
1119 * zero and no 0->1 transition happens.
1120 *
1121 * The cost is that if the AP switching was from an AP with keys
1122 * to one without, we still allocate tailroom while it would no
1123 * longer be needed. However, in the typical (fast) roaming case
1124 * within an ESS this usually won't happen.
1125 */
1126
1127 mutex_lock(&sdata->local->key_mtx);
1128 decrease_tailroom_need_count(sdata,
1129 sdata->crypto_tx_tailroom_pending_dec);
1130 sdata->crypto_tx_tailroom_pending_dec = 0;
1131 mutex_unlock(&sdata->local->key_mtx);
1132 }
1133
ieee80211_gtk_rekey_notify(struct ieee80211_vif * vif,const u8 * bssid,const u8 * replay_ctr,gfp_t gfp)1134 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
1135 const u8 *replay_ctr, gfp_t gfp)
1136 {
1137 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1138
1139 trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
1140
1141 cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
1142 }
1143 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
1144
ieee80211_get_key_rx_seq(struct ieee80211_key_conf * keyconf,int tid,struct ieee80211_key_seq * seq)1145 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
1146 int tid, struct ieee80211_key_seq *seq)
1147 {
1148 struct ieee80211_key *key;
1149 const u8 *pn;
1150
1151 key = container_of(keyconf, struct ieee80211_key, conf);
1152
1153 switch (key->conf.cipher) {
1154 case WLAN_CIPHER_SUITE_TKIP:
1155 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1156 return;
1157 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
1158 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
1159 break;
1160 case WLAN_CIPHER_SUITE_CCMP:
1161 case WLAN_CIPHER_SUITE_CCMP_256:
1162 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1163 return;
1164 if (tid < 0)
1165 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1166 else
1167 pn = key->u.ccmp.rx_pn[tid];
1168 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
1169 break;
1170 case WLAN_CIPHER_SUITE_AES_CMAC:
1171 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1172 if (WARN_ON(tid != 0))
1173 return;
1174 pn = key->u.aes_cmac.rx_pn;
1175 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
1176 break;
1177 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1178 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1179 if (WARN_ON(tid != 0))
1180 return;
1181 pn = key->u.aes_gmac.rx_pn;
1182 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
1183 break;
1184 case WLAN_CIPHER_SUITE_GCMP:
1185 case WLAN_CIPHER_SUITE_GCMP_256:
1186 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1187 return;
1188 if (tid < 0)
1189 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1190 else
1191 pn = key->u.gcmp.rx_pn[tid];
1192 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
1193 break;
1194 }
1195 }
1196 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
1197
ieee80211_set_key_rx_seq(struct ieee80211_key_conf * keyconf,int tid,struct ieee80211_key_seq * seq)1198 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1199 int tid, struct ieee80211_key_seq *seq)
1200 {
1201 struct ieee80211_key *key;
1202 u8 *pn;
1203
1204 key = container_of(keyconf, struct ieee80211_key, conf);
1205
1206 switch (key->conf.cipher) {
1207 case WLAN_CIPHER_SUITE_TKIP:
1208 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1209 return;
1210 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1211 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1212 break;
1213 case WLAN_CIPHER_SUITE_CCMP:
1214 case WLAN_CIPHER_SUITE_CCMP_256:
1215 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1216 return;
1217 if (tid < 0)
1218 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1219 else
1220 pn = key->u.ccmp.rx_pn[tid];
1221 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1222 break;
1223 case WLAN_CIPHER_SUITE_AES_CMAC:
1224 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1225 if (WARN_ON(tid != 0))
1226 return;
1227 pn = key->u.aes_cmac.rx_pn;
1228 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1229 break;
1230 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1231 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1232 if (WARN_ON(tid != 0))
1233 return;
1234 pn = key->u.aes_gmac.rx_pn;
1235 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1236 break;
1237 case WLAN_CIPHER_SUITE_GCMP:
1238 case WLAN_CIPHER_SUITE_GCMP_256:
1239 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1240 return;
1241 if (tid < 0)
1242 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1243 else
1244 pn = key->u.gcmp.rx_pn[tid];
1245 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1246 break;
1247 default:
1248 WARN_ON(1);
1249 break;
1250 }
1251 }
1252 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1253
ieee80211_remove_key(struct ieee80211_key_conf * keyconf)1254 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1255 {
1256 struct ieee80211_key *key;
1257
1258 key = container_of(keyconf, struct ieee80211_key, conf);
1259
1260 assert_key_lock(key->local);
1261
1262 /*
1263 * if key was uploaded, we assume the driver will/has remove(d)
1264 * it, so adjust bookkeeping accordingly
1265 */
1266 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1267 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1268
1269 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
1270 IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
1271 IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1272 increment_tailroom_need_count(key->sdata);
1273 }
1274
1275 ieee80211_key_free(key, false);
1276 }
1277 EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1278
1279 struct ieee80211_key_conf *
ieee80211_gtk_rekey_add(struct ieee80211_vif * vif,struct ieee80211_key_conf * keyconf)1280 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1281 struct ieee80211_key_conf *keyconf)
1282 {
1283 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1284 struct ieee80211_local *local = sdata->local;
1285 struct ieee80211_key *key;
1286 int err;
1287
1288 if (WARN_ON(!local->wowlan))
1289 return ERR_PTR(-EINVAL);
1290
1291 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1292 return ERR_PTR(-EINVAL);
1293
1294 key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1295 keyconf->keylen, keyconf->key,
1296 0, NULL, NULL);
1297 if (IS_ERR(key))
1298 return ERR_CAST(key);
1299
1300 if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1301 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1302
1303 err = ieee80211_key_link(key, sdata, NULL);
1304 if (err)
1305 return ERR_PTR(err);
1306
1307 return &key->conf;
1308 }
1309 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);
1310
ieee80211_key_mic_failure(struct ieee80211_key_conf * keyconf)1311 void ieee80211_key_mic_failure(struct ieee80211_key_conf *keyconf)
1312 {
1313 struct ieee80211_key *key;
1314
1315 key = container_of(keyconf, struct ieee80211_key, conf);
1316
1317 switch (key->conf.cipher) {
1318 case WLAN_CIPHER_SUITE_AES_CMAC:
1319 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1320 key->u.aes_cmac.icverrors++;
1321 break;
1322 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1323 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1324 key->u.aes_gmac.icverrors++;
1325 break;
1326 default:
1327 /* ignore the others for now, we don't keep counters now */
1328 break;
1329 }
1330 }
1331 EXPORT_SYMBOL_GPL(ieee80211_key_mic_failure);
1332
ieee80211_key_replay(struct ieee80211_key_conf * keyconf)1333 void ieee80211_key_replay(struct ieee80211_key_conf *keyconf)
1334 {
1335 struct ieee80211_key *key;
1336
1337 key = container_of(keyconf, struct ieee80211_key, conf);
1338
1339 switch (key->conf.cipher) {
1340 case WLAN_CIPHER_SUITE_CCMP:
1341 case WLAN_CIPHER_SUITE_CCMP_256:
1342 key->u.ccmp.replays++;
1343 break;
1344 case WLAN_CIPHER_SUITE_AES_CMAC:
1345 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1346 key->u.aes_cmac.replays++;
1347 break;
1348 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1349 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1350 key->u.aes_gmac.replays++;
1351 break;
1352 case WLAN_CIPHER_SUITE_GCMP:
1353 case WLAN_CIPHER_SUITE_GCMP_256:
1354 key->u.gcmp.replays++;
1355 break;
1356 }
1357 }
1358 EXPORT_SYMBOL_GPL(ieee80211_key_replay);
1359
