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, 2022-2025 Intel Corporation
10 */
11
12 #include <crypto/utils.h>
13 #include <linux/if_ether.h>
14 #include <linux/etherdevice.h>
15 #include <linux/list.h>
16 #include <linux/rcupdate.h>
17 #include <linux/rtnetlink.h>
18 #include <linux/slab.h>
19 #include <linux/export.h>
20 #include <net/mac80211.h>
21 #include <linux/unaligned.h>
22 #include "ieee80211_i.h"
23 #include "driver-ops.h"
24 #include "debugfs_key.h"
25 #include "aes_ccm.h"
26 #include "aes_cmac.h"
27 #include "aes_gmac.h"
28 #include "aes_gcm.h"
29
30
31 /**
32 * DOC: Key handling basics
33 *
34 * Key handling in mac80211 is done based on per-interface (sub_if_data)
35 * keys and per-station keys. Since each station belongs to an interface,
36 * each station key also belongs to that interface.
37 *
38 * Hardware acceleration is done on a best-effort basis for algorithms
39 * that are implemented in software, for each key the hardware is asked
40 * to enable that key for offloading but if it cannot do that the key is
41 * simply kept for software encryption (unless it is for an algorithm
42 * that isn't implemented in software).
43 * There is currently no way of knowing whether a key is handled in SW
44 * or HW except by looking into debugfs.
45 *
46 * All key management is internally protected by a mutex. Within all
47 * other parts of mac80211, key references are, just as STA structure
48 * references, protected by RCU. Note, however, that some things are
49 * unprotected, namely the key->sta dereferences within the hardware
50 * acceleration functions. This means that sta_info_destroy() must
51 * remove the key which waits for an RCU grace period.
52 */
53
54 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
55
56 static void
update_vlan_tailroom_need_count(struct ieee80211_sub_if_data * sdata,int delta)57 update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta)
58 {
59 struct ieee80211_sub_if_data *vlan;
60
61 if (sdata->vif.type != NL80211_IFTYPE_AP)
62 return;
63
64 /* crypto_tx_tailroom_needed_cnt is protected by this */
65 lockdep_assert_wiphy(sdata->local->hw.wiphy);
66
67 rcu_read_lock();
68
69 list_for_each_entry_rcu(vlan, &sdata->u.ap.vlans, u.vlan.list)
70 vlan->crypto_tx_tailroom_needed_cnt += delta;
71
72 rcu_read_unlock();
73 }
74
increment_tailroom_need_count(struct ieee80211_sub_if_data * sdata)75 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
76 {
77 /*
78 * When this count is zero, SKB resizing for allocating tailroom
79 * for IV or MMIC is skipped. But, this check has created two race
80 * cases in xmit path while transiting from zero count to one:
81 *
82 * 1. SKB resize was skipped because no key was added but just before
83 * the xmit key is added and SW encryption kicks off.
84 *
85 * 2. SKB resize was skipped because all the keys were hw planted but
86 * just before xmit one of the key is deleted and SW encryption kicks
87 * off.
88 *
89 * In both the above case SW encryption will find not enough space for
90 * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
91 *
92 * Solution has been explained at
93 * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
94 */
95
96 lockdep_assert_wiphy(sdata->local->hw.wiphy);
97
98 update_vlan_tailroom_need_count(sdata, 1);
99
100 if (!sdata->crypto_tx_tailroom_needed_cnt++) {
101 /*
102 * Flush all XMIT packets currently using HW encryption or no
103 * encryption at all if the count transition is from 0 -> 1.
104 */
105 synchronize_net();
106 }
107 }
108
decrease_tailroom_need_count(struct ieee80211_sub_if_data * sdata,int delta)109 static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata,
110 int delta)
111 {
112 lockdep_assert_wiphy(sdata->local->hw.wiphy);
113
114 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta);
115
116 update_vlan_tailroom_need_count(sdata, -delta);
117 sdata->crypto_tx_tailroom_needed_cnt -= delta;
118 }
119
ieee80211_key_enable_hw_accel(struct ieee80211_key * key)120 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
121 {
122 struct ieee80211_sub_if_data *sdata = key->sdata;
123 struct sta_info *sta;
124 int ret = -EOPNOTSUPP;
125
126 might_sleep();
127 lockdep_assert_wiphy(key->local->hw.wiphy);
128
129 if (key->flags & KEY_FLAG_TAINTED) {
130 /* If we get here, it's during resume and the key is
131 * tainted so shouldn't be used/programmed any more.
132 * However, its flags may still indicate that it was
133 * programmed into the device (since we're in resume)
134 * so clear that flag now to avoid trying to remove
135 * it again later.
136 */
137 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE &&
138 !(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
139 IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
140 IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
141 increment_tailroom_need_count(sdata);
142
143 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
144 return -EINVAL;
145 }
146
147 if (!key->local->ops->set_key)
148 goto out_unsupported;
149
150 sta = key->sta;
151
152 /*
153 * If this is a per-STA GTK, check if it
154 * is supported; if not, return.
155 */
156 if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) &&
157 !ieee80211_hw_check(&key->local->hw, SUPPORTS_PER_STA_GTK))
158 goto out_unsupported;
159
160 if (sta && !sta->uploaded)
161 goto out_unsupported;
162
163 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
164 /*
165 * The driver doesn't know anything about VLAN interfaces.
166 * Hence, don't send GTKs for VLAN interfaces to the driver.
167 */
168 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
169 ret = 1;
170 goto out_unsupported;
171 }
172 }
173
174 if (key->conf.link_id >= 0 && sdata->vif.active_links &&
175 !(sdata->vif.active_links & BIT(key->conf.link_id)))
176 return 0;
177
178 ret = drv_set_key(key->local, SET_KEY, sdata,
179 sta ? &sta->sta : NULL, &key->conf);
180
181 if (!ret) {
182 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
183
184 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
185 IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
186 IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
187 decrease_tailroom_need_count(sdata, 1);
188
189 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
190 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
191
192 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) &&
193 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC));
194
195 return 0;
196 }
197
198 if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1)
199 sdata_err(sdata,
200 "failed to set key (%d, %pM) to hardware (%d)\n",
201 key->conf.keyidx,
202 sta ? sta->sta.addr : bcast_addr, ret);
203
204 out_unsupported:
205 switch (key->conf.cipher) {
206 case WLAN_CIPHER_SUITE_WEP40:
207 case WLAN_CIPHER_SUITE_WEP104:
208 case WLAN_CIPHER_SUITE_TKIP:
209 case WLAN_CIPHER_SUITE_CCMP:
210 case WLAN_CIPHER_SUITE_CCMP_256:
211 case WLAN_CIPHER_SUITE_GCMP:
212 case WLAN_CIPHER_SUITE_GCMP_256:
213 case WLAN_CIPHER_SUITE_AES_CMAC:
214 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
215 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
216 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
217 /* all of these we can do in software - if driver can */
218 if (ret == 1)
219 return 0;
220 if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL))
221 return -EINVAL;
222 return 0;
223 default:
224 return -EINVAL;
225 }
226 }
227
ieee80211_key_disable_hw_accel(struct ieee80211_key * key)228 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
229 {
230 struct ieee80211_sub_if_data *sdata;
231 struct sta_info *sta;
232 int ret;
233
234 might_sleep();
235
236 if (!key || !key->local->ops->set_key)
237 return;
238
239 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
240 return;
241
242 sta = key->sta;
243 sdata = key->sdata;
244
245 lockdep_assert_wiphy(key->local->hw.wiphy);
246
247 if (key->conf.link_id >= 0 && sdata->vif.active_links &&
248 !(sdata->vif.active_links & BIT(key->conf.link_id)))
249 return;
250
251 if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
252 IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
253 IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
254 increment_tailroom_need_count(sdata);
255
256 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
257 ret = drv_set_key(key->local, DISABLE_KEY, sdata,
258 sta ? &sta->sta : NULL, &key->conf);
259
260 if (ret)
261 sdata_err(sdata,
262 "failed to remove key (%d, %pM) from hardware (%d)\n",
263 key->conf.keyidx,
264 sta ? sta->sta.addr : bcast_addr, ret);
265 }
266
_ieee80211_set_tx_key(struct ieee80211_key * key,bool force)267 static int _ieee80211_set_tx_key(struct ieee80211_key *key, bool force)
268 {
269 struct sta_info *sta = key->sta;
270 struct ieee80211_local *local = key->local;
271
272 lockdep_assert_wiphy(local->hw.wiphy);
273
274 set_sta_flag(sta, WLAN_STA_USES_ENCRYPTION);
275
276 sta->ptk_idx = key->conf.keyidx;
277
278 if (force || !ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT))
279 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
280 ieee80211_check_fast_xmit(sta);
281
282 return 0;
283 }
284
ieee80211_set_tx_key(struct ieee80211_key * key)285 int ieee80211_set_tx_key(struct ieee80211_key *key)
286 {
287 return _ieee80211_set_tx_key(key, false);
288 }
289
ieee80211_pairwise_rekey(struct ieee80211_key * old,struct ieee80211_key * new)290 static void ieee80211_pairwise_rekey(struct ieee80211_key *old,
291 struct ieee80211_key *new)
292 {
293 struct ieee80211_local *local = new->local;
294 struct sta_info *sta = new->sta;
295 int i;
296
297 lockdep_assert_wiphy(local->hw.wiphy);
298
299 if (new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX) {
300 /* Extended Key ID key install, initial one or rekey */
301
302 if (sta->ptk_idx != INVALID_PTK_KEYIDX &&
303 !ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT)) {
304 /* Aggregation Sessions with Extended Key ID must not
305 * mix MPDUs with different keyIDs within one A-MPDU.
306 * Tear down running Tx aggregation sessions and block
307 * new Rx/Tx aggregation requests during rekey to
308 * ensure there are no A-MPDUs when the driver is not
309 * supporting A-MPDU key borders. (Blocking Tx only
310 * would be sufficient but WLAN_STA_BLOCK_BA gets the
311 * job done for the few ms we need it.)
312 */
313 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
314 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
315 __ieee80211_stop_tx_ba_session(sta, i,
316 AGG_STOP_LOCAL_REQUEST);
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_link_data * link,int idx,bool uni,bool multi)347 static void __ieee80211_set_default_key(struct ieee80211_link_data *link,
348 int idx, bool uni, bool multi)
349 {
350 struct ieee80211_sub_if_data *sdata = link->sdata;
351 struct ieee80211_key *key = NULL;
352
353 lockdep_assert_wiphy(sdata->local->hw.wiphy);
354
355 if (idx >= 0 && idx < NUM_DEFAULT_KEYS) {
356 key = wiphy_dereference(sdata->local->hw.wiphy,
357 sdata->keys[idx]);
358 if (!key)
359 key = wiphy_dereference(sdata->local->hw.wiphy,
360 link->gtk[idx]);
361 }
362
363 if (uni) {
364 rcu_assign_pointer(sdata->default_unicast_key, key);
365 ieee80211_check_fast_xmit_iface(sdata);
366 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
367 drv_set_default_unicast_key(sdata->local, sdata, idx);
368 }
369
370 if (multi)
371 rcu_assign_pointer(link->default_multicast_key, key);
372
373 ieee80211_debugfs_key_update_default(sdata);
374 }
375
ieee80211_set_default_key(struct ieee80211_link_data * link,int idx,bool uni,bool multi)376 void ieee80211_set_default_key(struct ieee80211_link_data *link, int idx,
377 bool uni, bool multi)
378 {
379 lockdep_assert_wiphy(link->sdata->local->hw.wiphy);
380
381 __ieee80211_set_default_key(link, idx, uni, multi);
382 }
383
384 static void
__ieee80211_set_default_mgmt_key(struct ieee80211_link_data * link,int idx)385 __ieee80211_set_default_mgmt_key(struct ieee80211_link_data *link, int idx)
386 {
387 struct ieee80211_sub_if_data *sdata = link->sdata;
388 struct ieee80211_key *key = NULL;
389
390 lockdep_assert_wiphy(sdata->local->hw.wiphy);
391
392 if (idx >= NUM_DEFAULT_KEYS &&
393 idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
394 key = wiphy_dereference(sdata->local->hw.wiphy,
395 link->gtk[idx]);
396
397 rcu_assign_pointer(link->default_mgmt_key, key);
398
399 ieee80211_debugfs_key_update_default(sdata);
400 }
401
ieee80211_set_default_mgmt_key(struct ieee80211_link_data * link,int idx)402 void ieee80211_set_default_mgmt_key(struct ieee80211_link_data *link,
403 int idx)
404 {
405 lockdep_assert_wiphy(link->sdata->local->hw.wiphy);
406
407 __ieee80211_set_default_mgmt_key(link, idx);
408 }
409
410 static void
__ieee80211_set_default_beacon_key(struct ieee80211_link_data * link,int idx)411 __ieee80211_set_default_beacon_key(struct ieee80211_link_data *link, int idx)
412 {
413 struct ieee80211_sub_if_data *sdata = link->sdata;
414 struct ieee80211_key *key = NULL;
415
416 lockdep_assert_wiphy(sdata->local->hw.wiphy);
417
418 if (idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS &&
419 idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
420 NUM_DEFAULT_BEACON_KEYS)
421 key = wiphy_dereference(sdata->local->hw.wiphy,
422 link->gtk[idx]);
423
424 rcu_assign_pointer(link->default_beacon_key, key);
425
426 ieee80211_debugfs_key_update_default(sdata);
427 }
428
ieee80211_set_default_beacon_key(struct ieee80211_link_data * link,int idx)429 void ieee80211_set_default_beacon_key(struct ieee80211_link_data *link,
430 int idx)
431 {
432 lockdep_assert_wiphy(link->sdata->local->hw.wiphy);
433
434 __ieee80211_set_default_beacon_key(link, idx);
435 }
436
ieee80211_key_replace(struct ieee80211_sub_if_data * sdata,struct ieee80211_link_data * link,struct sta_info * sta,bool pairwise,struct ieee80211_key * old,struct ieee80211_key * new)437 static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
438 struct ieee80211_link_data *link,
439 struct sta_info *sta,
440 bool pairwise,
441 struct ieee80211_key *old,
442 struct ieee80211_key *new)
443 {
444 struct link_sta_info *link_sta = sta ? &sta->deflink : NULL;
445 int link_id;
446 int idx;
447 int ret = 0;
448 bool defunikey, defmultikey, defmgmtkey, defbeaconkey;
449 bool is_wep;
450
451 lockdep_assert_wiphy(sdata->local->hw.wiphy);
452
453 /* caller must provide at least one old/new */
454 if (WARN_ON(!new && !old))
455 return 0;
456
457 if (new) {
458 idx = new->conf.keyidx;
459 is_wep = new->conf.cipher == WLAN_CIPHER_SUITE_WEP40 ||
460 new->conf.cipher == WLAN_CIPHER_SUITE_WEP104;
461 link_id = new->conf.link_id;
462 } else {
463 idx = old->conf.keyidx;
464 is_wep = old->conf.cipher == WLAN_CIPHER_SUITE_WEP40 ||
465 old->conf.cipher == WLAN_CIPHER_SUITE_WEP104;
466 link_id = old->conf.link_id;
467 }
468
469 if (WARN(old && old->conf.link_id != link_id,
470 "old link ID %d doesn't match new link ID %d\n",
471 old->conf.link_id, link_id))
472 return -EINVAL;
473
474 if (link_id >= 0) {
475 if (!link) {
476 link = sdata_dereference(sdata->link[link_id], sdata);
477 if (!link)
478 return -ENOLINK;
479 }
480
481 if (sta) {
482 link_sta = rcu_dereference_protected(sta->link[link_id],
483 lockdep_is_held(&sta->local->hw.wiphy->mtx));
484 if (!link_sta)
485 return -ENOLINK;
486 }
487 } else {
488 link = &sdata->deflink;
489 }
490
491 if ((is_wep || pairwise) && idx >= NUM_DEFAULT_KEYS)
492 return -EINVAL;
493
494 WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
495
496 if (new && sta && pairwise) {
497 /* Unicast rekey needs special handling. With Extended Key ID
498 * old is still NULL for the first rekey.
499 */
500 ieee80211_pairwise_rekey(old, new);
501 }
502
503 if (old) {
504 if (old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
505 ieee80211_key_disable_hw_accel(old);
506
507 if (new)
508 ret = ieee80211_key_enable_hw_accel(new);
509 }
510 } else {
511 if (!new->local->wowlan) {
512 ret = ieee80211_key_enable_hw_accel(new);
513 } else if (link_id < 0 || !sdata->vif.active_links ||
514 BIT(link_id) & sdata->vif.active_links) {
515 new->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
516 if (!(new->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
517 IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
518 IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
519 decrease_tailroom_need_count(sdata, 1);
520 }
521 }
522
523 if (ret)
524 return ret;
525
526 if (new)
527 list_add_tail_rcu(&new->list, &sdata->key_list);
528
529 if (sta) {
530 if (pairwise) {
531 rcu_assign_pointer(sta->ptk[idx], new);
532 if (new &&
533 !(new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX))
534 _ieee80211_set_tx_key(new, true);
535 } else {
536 rcu_assign_pointer(link_sta->gtk[idx], new);
537 }
538 /* Only needed for transition from no key -> key.
539 * Still triggers unnecessary when using Extended Key ID
540 * and installing the second key ID the first time.
541 */
542 if (new && !old)
543 ieee80211_check_fast_rx(sta);
544 } else {
545 defunikey = old &&
546 old == wiphy_dereference(sdata->local->hw.wiphy,
547 sdata->default_unicast_key);
548 defmultikey = old &&
549 old == wiphy_dereference(sdata->local->hw.wiphy,
550 link->default_multicast_key);
551 defmgmtkey = old &&
552 old == wiphy_dereference(sdata->local->hw.wiphy,
553 link->default_mgmt_key);
554 defbeaconkey = old &&
555 old == wiphy_dereference(sdata->local->hw.wiphy,
556 link->default_beacon_key);
557
558 if (defunikey && !new)
559 __ieee80211_set_default_key(link, -1, true, false);
560 if (defmultikey && !new)
561 __ieee80211_set_default_key(link, -1, false, true);
562 if (defmgmtkey && !new)
563 __ieee80211_set_default_mgmt_key(link, -1);
564 if (defbeaconkey && !new)
565 __ieee80211_set_default_beacon_key(link, -1);
566
567 if (is_wep || pairwise)
568 rcu_assign_pointer(sdata->keys[idx], new);
569 else
570 rcu_assign_pointer(link->gtk[idx], new);
571
572 if (defunikey && new)
573 __ieee80211_set_default_key(link, new->conf.keyidx,
574 true, false);
575 if (defmultikey && new)
576 __ieee80211_set_default_key(link, new->conf.keyidx,
577 false, true);
578 if (defmgmtkey && new)
579 __ieee80211_set_default_mgmt_key(link,
580 new->conf.keyidx);
581 if (defbeaconkey && new)
582 __ieee80211_set_default_beacon_key(link,
583 new->conf.keyidx);
584 }
585
586 if (old)
587 list_del_rcu(&old->list);
588
589 return 0;
590 }
591
592 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)593 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
594 const u8 *key_data,
595 size_t seq_len, const u8 *seq)
596 {
597 struct ieee80211_key *key;
598 int i, j, err;
599
600 if (WARN_ON(idx < 0 ||
601 idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
602 NUM_DEFAULT_BEACON_KEYS))
603 return ERR_PTR(-EINVAL);
604
605 key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
606 if (!key)
607 return ERR_PTR(-ENOMEM);
608
609 /*
610 * Default to software encryption; we'll later upload the
611 * key to the hardware if possible.
612 */
613 key->conf.flags = 0;
614 key->flags = 0;
615
616 key->conf.link_id = -1;
617 key->conf.cipher = cipher;
618 key->conf.keyidx = idx;
619 key->conf.keylen = key_len;
620 switch (cipher) {
621 case WLAN_CIPHER_SUITE_WEP40:
622 case WLAN_CIPHER_SUITE_WEP104:
623 key->conf.iv_len = IEEE80211_WEP_IV_LEN;
624 key->conf.icv_len = IEEE80211_WEP_ICV_LEN;
625 break;
626 case WLAN_CIPHER_SUITE_TKIP:
627 key->conf.iv_len = IEEE80211_TKIP_IV_LEN;
628 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN;
629 if (seq) {
630 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
631 key->u.tkip.rx[i].iv32 =
632 get_unaligned_le32(&seq[2]);
633 key->u.tkip.rx[i].iv16 =
634 get_unaligned_le16(seq);
635 }
636 }
637 spin_lock_init(&key->u.tkip.txlock);
638 break;
639 case WLAN_CIPHER_SUITE_CCMP:
640 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN;
641 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN;
642 if (seq) {
643 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
644 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++)
645 key->u.ccmp.rx_pn[i][j] =
646 seq[IEEE80211_CCMP_PN_LEN - j - 1];
647 }
648 /*
649 * Initialize AES key state here as an optimization so that
650 * it does not need to be initialized for every packet.
651 */
652 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
653 key_data, key_len, IEEE80211_CCMP_MIC_LEN);
654 if (IS_ERR(key->u.ccmp.tfm)) {
655 err = PTR_ERR(key->u.ccmp.tfm);
656 kfree(key);
657 return ERR_PTR(err);
658 }
659 break;
660 case WLAN_CIPHER_SUITE_CCMP_256:
661 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN;
662 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN;
663 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
664 for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++)
665 key->u.ccmp.rx_pn[i][j] =
666 seq[IEEE80211_CCMP_256_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.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
671 key_data, key_len, IEEE80211_CCMP_256_MIC_LEN);
672 if (IS_ERR(key->u.ccmp.tfm)) {
673 err = PTR_ERR(key->u.ccmp.tfm);
674 kfree(key);
675 return ERR_PTR(err);
676 }
677 break;
678 case WLAN_CIPHER_SUITE_AES_CMAC:
679 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
680 key->conf.iv_len = 0;
681 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
682 key->conf.icv_len = sizeof(struct ieee80211_mmie);
683 else
684 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
685 if (seq)
686 for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
687 key->u.aes_cmac.rx_pn[j] =
688 seq[IEEE80211_CMAC_PN_LEN - j - 1];
689 /*
690 * Initialize AES key state here as an optimization so that
691 * it does not need to be initialized for every packet.
692 */
693 key->u.aes_cmac.tfm =
694 ieee80211_aes_cmac_key_setup(key_data, key_len);
695 if (IS_ERR(key->u.aes_cmac.tfm)) {
696 err = PTR_ERR(key->u.aes_cmac.tfm);
697 kfree(key);
698 return ERR_PTR(err);
699 }
700 break;
701 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
702 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
703 key->conf.iv_len = 0;
704 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
705 if (seq)
706 for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++)
707 key->u.aes_gmac.rx_pn[j] =
708 seq[IEEE80211_GMAC_PN_LEN - j - 1];
709 /* Initialize AES key state here as an optimization so that
710 * it does not need to be initialized for every packet.
711 */
712 key->u.aes_gmac.tfm =
713 ieee80211_aes_gmac_key_setup(key_data, key_len);
714 if (IS_ERR(key->u.aes_gmac.tfm)) {
715 err = PTR_ERR(key->u.aes_gmac.tfm);
716 kfree(key);
717 return ERR_PTR(err);
718 }
719 break;
720 case WLAN_CIPHER_SUITE_GCMP:
721 case WLAN_CIPHER_SUITE_GCMP_256:
722 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
723 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
724 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
725 for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
726 key->u.gcmp.rx_pn[i][j] =
727 seq[IEEE80211_GCMP_PN_LEN - j - 1];
728 /* Initialize AES key state here as an optimization so that
729 * it does not need to be initialized for every packet.
730 */
731 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
732 key_len);
733 if (IS_ERR(key->u.gcmp.tfm)) {
734 err = PTR_ERR(key->u.gcmp.tfm);
735 kfree(key);
736 return ERR_PTR(err);
737 }
738 break;
739 }
740 memcpy(key->conf.key, key_data, key_len);
741 INIT_LIST_HEAD(&key->list);
742
743 return key;
744 }
745
ieee80211_key_free_common(struct ieee80211_key * key)746 static void ieee80211_key_free_common(struct ieee80211_key *key)
747 {
748 switch (key->conf.cipher) {
749 case WLAN_CIPHER_SUITE_CCMP:
750 case WLAN_CIPHER_SUITE_CCMP_256:
751 ieee80211_aes_key_free(key->u.ccmp.tfm);
752 break;
753 case WLAN_CIPHER_SUITE_AES_CMAC:
754 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
755 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
756 break;
757 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
758 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
759 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm);
760 break;
761 case WLAN_CIPHER_SUITE_GCMP:
762 case WLAN_CIPHER_SUITE_GCMP_256:
763 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
764 break;
765 }
766 kfree_sensitive(key);
767 }
768
__ieee80211_key_destroy(struct ieee80211_key * key,bool delay_tailroom)769 static void __ieee80211_key_destroy(struct ieee80211_key *key,
770 bool delay_tailroom)
771 {
772 if (key->local) {
773 struct ieee80211_sub_if_data *sdata = key->sdata;
774
775 ieee80211_debugfs_key_remove(key);
776
777 if (delay_tailroom) {
778 /* see ieee80211_delayed_tailroom_dec */
779 sdata->crypto_tx_tailroom_pending_dec++;
780 wiphy_delayed_work_queue(sdata->local->hw.wiphy,
781 &sdata->dec_tailroom_needed_wk,
782 HZ / 2);
783 } else {
784 decrease_tailroom_need_count(sdata, 1);
785 }
786 }
787
788 ieee80211_key_free_common(key);
789 }
790
ieee80211_key_destroy(struct ieee80211_key * key,bool delay_tailroom)791 static void ieee80211_key_destroy(struct ieee80211_key *key,
792 bool delay_tailroom)
793 {
794 if (!key)
795 return;
796
797 /*
798 * Synchronize so the TX path and rcu key iterators
799 * can no longer be using this key before we free/remove it.
800 */
801 synchronize_net();
802
803 __ieee80211_key_destroy(key, delay_tailroom);
804 }
805
ieee80211_key_free_unused(struct ieee80211_key * key)806 void ieee80211_key_free_unused(struct ieee80211_key *key)
807 {
808 if (!key)
809 return;
810
811 WARN_ON(key->sdata || key->local);
812 ieee80211_key_free_common(key);
813 }
814
ieee80211_key_identical(struct ieee80211_sub_if_data * sdata,struct ieee80211_key * old,struct ieee80211_key * new)815 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata,
816 struct ieee80211_key *old,
817 struct ieee80211_key *new)
818 {
819 u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP];
820 u8 *tk_old, *tk_new;
821
822 if (!old || new->conf.keylen != old->conf.keylen)
823 return false;
824
825 tk_old = old->conf.key;
826 tk_new = new->conf.key;
827
828 /*
829 * In station mode, don't compare the TX MIC key, as it's never used
830 * and offloaded rekeying may not care to send it to the host. This
831 * is the case in iwlwifi, for example.
832 */
833 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
834 new->conf.cipher == WLAN_CIPHER_SUITE_TKIP &&
835 new->conf.keylen == WLAN_KEY_LEN_TKIP &&
836 !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
837 memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP);
838 memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP);
839 memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
840 memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
841 tk_old = tkip_old;
842 tk_new = tkip_new;
843 }
844
845 return !crypto_memneq(tk_old, tk_new, new->conf.keylen);
846 }
847
ieee80211_key_link(struct ieee80211_key * key,struct ieee80211_link_data * link,struct sta_info * sta)848 int ieee80211_key_link(struct ieee80211_key *key,
849 struct ieee80211_link_data *link,
850 struct sta_info *sta)
851 {
852 struct ieee80211_sub_if_data *sdata = link->sdata;
853 static atomic_t key_color = ATOMIC_INIT(0);
854 struct ieee80211_key *old_key = NULL;
855 int idx = key->conf.keyidx;
856 bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
857 /*
858 * We want to delay tailroom updates only for station - in that
859 * case it helps roaming speed, but in other cases it hurts and
860 * can cause warnings to appear.
861 */
862 bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION;
863 int ret;
864
865 lockdep_assert_wiphy(sdata->local->hw.wiphy);
866
867 if (sta && pairwise) {
868 struct ieee80211_key *alt_key;
869
870 old_key = wiphy_dereference(sdata->local->hw.wiphy,
871 sta->ptk[idx]);
872 alt_key = wiphy_dereference(sdata->local->hw.wiphy,
873 sta->ptk[idx ^ 1]);
874
875 /* The rekey code assumes that the old and new key are using
876 * the same cipher. Enforce the assumption for pairwise keys.
877 */
878 if ((alt_key && alt_key->conf.cipher != key->conf.cipher) ||
879 (old_key && old_key->conf.cipher != key->conf.cipher)) {
880 ret = -EOPNOTSUPP;
881 goto out;
882 }
883 } else if (sta) {
884 struct link_sta_info *link_sta = &sta->deflink;
885 int link_id = key->conf.link_id;
886
887 if (link_id >= 0) {
888 link_sta = rcu_dereference_protected(sta->link[link_id],
889 lockdep_is_held(&sta->local->hw.wiphy->mtx));
890 if (!link_sta) {
891 ret = -ENOLINK;
892 goto out;
893 }
894 }
895
896 old_key = wiphy_dereference(sdata->local->hw.wiphy,
897 link_sta->gtk[idx]);
898 } else {
899 if (idx < NUM_DEFAULT_KEYS)
900 old_key = wiphy_dereference(sdata->local->hw.wiphy,
901 sdata->keys[idx]);
902 if (!old_key)
903 old_key = wiphy_dereference(sdata->local->hw.wiphy,
904 link->gtk[idx]);
905 }
906
907 /* Non-pairwise keys must also not switch the cipher on rekey */
908 if (!pairwise) {
909 if (old_key && old_key->conf.cipher != key->conf.cipher) {
910 ret = -EOPNOTSUPP;
911 goto out;
912 }
913 }
914
915 /*
916 * Silently accept key re-installation without really installing the
917 * new version of the key to avoid nonce reuse or replay issues.
918 */
919 if (ieee80211_key_identical(sdata, old_key, key)) {
920 ret = -EALREADY;
921 goto out;
922 }
923
924 key->local = sdata->local;
925 key->sdata = sdata;
926 key->sta = sta;
927
928 /*
929 * Assign a unique ID to every key so we can easily prevent mixed
930 * key and fragment cache attacks.
931 */
932 key->color = atomic_inc_return(&key_color);
933
934 /* keep this flag for easier access later */
935 if (sta && sta->sta.spp_amsdu)
936 key->conf.flags |= IEEE80211_KEY_FLAG_SPP_AMSDU;
937
938 increment_tailroom_need_count(sdata);
939
940 ret = ieee80211_key_replace(sdata, link, sta, pairwise, old_key, key);
941
942 if (!ret) {
943 ieee80211_debugfs_key_add(key);
944 ieee80211_key_destroy(old_key, delay_tailroom);
945 } else {
946 ieee80211_key_free(key, delay_tailroom);
947 }
948
949 key = NULL;
950
951 out:
952 ieee80211_key_free_unused(key);
953 return ret;
954 }
955
ieee80211_key_free(struct ieee80211_key * key,bool delay_tailroom)956 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
957 {
958 if (!key)
959 return;
960
961 /*
962 * Replace key with nothingness if it was ever used.
963 */
964 if (key->sdata)
965 ieee80211_key_replace(key->sdata, NULL, key->sta,
966 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
967 key, NULL);
968 ieee80211_key_destroy(key, delay_tailroom);
969 }
970
ieee80211_reenable_keys(struct ieee80211_sub_if_data * sdata)971 void ieee80211_reenable_keys(struct ieee80211_sub_if_data *sdata)
972 {
973 struct ieee80211_key *key;
974 struct ieee80211_sub_if_data *vlan;
975
976 lockdep_assert_wiphy(sdata->local->hw.wiphy);
977
978 sdata->crypto_tx_tailroom_needed_cnt = 0;
979 sdata->crypto_tx_tailroom_pending_dec = 0;
980
981 if (sdata->vif.type == NL80211_IFTYPE_AP) {
982 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
983 vlan->crypto_tx_tailroom_needed_cnt = 0;
984 vlan->crypto_tx_tailroom_pending_dec = 0;
985 }
986 }
987
988 if (ieee80211_sdata_running(sdata)) {
989 list_for_each_entry(key, &sdata->key_list, list) {
990 if (!(key->flags & KEY_FLAG_TAINTED))
991 increment_tailroom_need_count(sdata);
992 ieee80211_key_enable_hw_accel(key);
993 }
994 }
995 }
996
997 static void
ieee80211_key_iter(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_key * key,void (* iter)(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_sta * sta,struct ieee80211_key_conf * key,void * data),void * iter_data)998 ieee80211_key_iter(struct ieee80211_hw *hw,
999 struct ieee80211_vif *vif,
1000 struct ieee80211_key *key,
1001 void (*iter)(struct ieee80211_hw *hw,
1002 struct ieee80211_vif *vif,
1003 struct ieee80211_sta *sta,
1004 struct ieee80211_key_conf *key,
1005 void *data),
1006 void *iter_data)
1007 {
1008 /* skip keys of station in removal process */
1009 if (key->sta && key->sta->removed)
1010 return;
1011 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1012 return;
1013 iter(hw, vif, key->sta ? &key->sta->sta : NULL,
1014 &key->conf, iter_data);
1015 }
1016
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)1017 void ieee80211_iter_keys(struct ieee80211_hw *hw,
1018 struct ieee80211_vif *vif,
1019 void (*iter)(struct ieee80211_hw *hw,
1020 struct ieee80211_vif *vif,
1021 struct ieee80211_sta *sta,
1022 struct ieee80211_key_conf *key,
1023 void *data),
1024 void *iter_data)
1025 {
1026 struct ieee80211_local *local = hw_to_local(hw);
1027 struct ieee80211_key *key, *tmp;
1028 struct ieee80211_sub_if_data *sdata;
1029
1030 lockdep_assert_wiphy(hw->wiphy);
1031
1032 if (vif) {
1033 sdata = vif_to_sdata(vif);
1034 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
1035 ieee80211_key_iter(hw, vif, key, iter, iter_data);
1036 } else {
1037 list_for_each_entry(sdata, &local->interfaces, list)
1038 list_for_each_entry_safe(key, tmp,
1039 &sdata->key_list, list)
1040 ieee80211_key_iter(hw, &sdata->vif, key,
1041 iter, iter_data);
1042 }
1043 }
1044 EXPORT_SYMBOL(ieee80211_iter_keys);
1045
1046 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)1047 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
1048 struct ieee80211_sub_if_data *sdata,
1049 void (*iter)(struct ieee80211_hw *hw,
1050 struct ieee80211_vif *vif,
1051 struct ieee80211_sta *sta,
1052 struct ieee80211_key_conf *key,
1053 void *data),
1054 void *iter_data)
1055 {
1056 struct ieee80211_key *key;
1057
1058 list_for_each_entry_rcu(key, &sdata->key_list, list)
1059 ieee80211_key_iter(hw, &sdata->vif, key, iter, iter_data);
1060 }
1061
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)1062 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
1063 struct ieee80211_vif *vif,
1064 void (*iter)(struct ieee80211_hw *hw,
1065 struct ieee80211_vif *vif,
1066 struct ieee80211_sta *sta,
1067 struct ieee80211_key_conf *key,
1068 void *data),
1069 void *iter_data)
1070 {
1071 struct ieee80211_local *local = hw_to_local(hw);
1072 struct ieee80211_sub_if_data *sdata;
1073
1074 if (vif) {
1075 sdata = vif_to_sdata(vif);
1076 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
1077 } else {
1078 list_for_each_entry_rcu(sdata, &local->interfaces, list)
1079 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
1080 }
1081 }
1082 EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
1083
ieee80211_free_keys_iface(struct ieee80211_sub_if_data * sdata,struct list_head * keys)1084 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
1085 struct list_head *keys)
1086 {
1087 struct ieee80211_key *key, *tmp;
1088
1089 decrease_tailroom_need_count(sdata,
1090 sdata->crypto_tx_tailroom_pending_dec);
1091 sdata->crypto_tx_tailroom_pending_dec = 0;
1092
1093 ieee80211_debugfs_key_remove_mgmt_default(sdata);
1094 ieee80211_debugfs_key_remove_beacon_default(sdata);
1095
1096 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
1097 ieee80211_key_replace(key->sdata, NULL, key->sta,
1098 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1099 key, NULL);
1100 list_add_tail(&key->list, keys);
1101 }
1102
1103 ieee80211_debugfs_key_update_default(sdata);
1104 }
1105
ieee80211_remove_link_keys(struct ieee80211_link_data * link,struct list_head * keys)1106 void ieee80211_remove_link_keys(struct ieee80211_link_data *link,
1107 struct list_head *keys)
1108 {
1109 struct ieee80211_sub_if_data *sdata = link->sdata;
1110 struct ieee80211_local *local = sdata->local;
1111 struct ieee80211_key *key, *tmp;
1112
1113 lockdep_assert_wiphy(local->hw.wiphy);
1114
1115 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
1116 if (key->conf.link_id != link->link_id)
1117 continue;
1118 ieee80211_key_replace(key->sdata, link, key->sta,
1119 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1120 key, NULL);
1121 list_add_tail(&key->list, keys);
1122 }
1123 }
1124
ieee80211_free_key_list(struct ieee80211_local * local,struct list_head * keys)1125 void ieee80211_free_key_list(struct ieee80211_local *local,
1126 struct list_head *keys)
1127 {
1128 struct ieee80211_key *key, *tmp;
1129
1130 lockdep_assert_wiphy(local->hw.wiphy);
1131
1132 list_for_each_entry_safe(key, tmp, keys, list)
1133 __ieee80211_key_destroy(key, false);
1134 }
1135
ieee80211_free_keys(struct ieee80211_sub_if_data * sdata,bool force_synchronize)1136 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
1137 bool force_synchronize)
1138 {
1139 struct ieee80211_local *local = sdata->local;
1140 struct ieee80211_sub_if_data *vlan;
1141 struct ieee80211_sub_if_data *master;
1142 struct ieee80211_key *key, *tmp;
1143 LIST_HEAD(keys);
1144
1145 wiphy_delayed_work_cancel(local->hw.wiphy,
1146 &sdata->dec_tailroom_needed_wk);
1147
1148 lockdep_assert_wiphy(local->hw.wiphy);
1149
1150 ieee80211_free_keys_iface(sdata, &keys);
1151
1152 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1153 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1154 ieee80211_free_keys_iface(vlan, &keys);
1155 }
1156
1157 if (!list_empty(&keys) || force_synchronize)
1158 synchronize_net();
1159 list_for_each_entry_safe(key, tmp, &keys, list)
1160 __ieee80211_key_destroy(key, false);
1161
1162 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1163 if (sdata->bss) {
1164 master = container_of(sdata->bss,
1165 struct ieee80211_sub_if_data,
1166 u.ap);
1167
1168 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
1169 master->crypto_tx_tailroom_needed_cnt);
1170 }
1171 } else {
1172 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
1173 sdata->crypto_tx_tailroom_pending_dec);
1174 }
1175
1176 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1177 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1178 WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
1179 vlan->crypto_tx_tailroom_pending_dec);
1180 }
1181 }
1182
ieee80211_free_sta_keys(struct ieee80211_local * local,struct sta_info * sta)1183 void ieee80211_free_sta_keys(struct ieee80211_local *local,
1184 struct sta_info *sta)
1185 {
1186 struct ieee80211_key *key;
1187 int i;
1188
1189 lockdep_assert_wiphy(local->hw.wiphy);
1190
1191 for (i = 0; i < ARRAY_SIZE(sta->deflink.gtk); i++) {
1192 key = wiphy_dereference(local->hw.wiphy, sta->deflink.gtk[i]);
1193 if (!key)
1194 continue;
1195 ieee80211_key_replace(key->sdata, NULL, key->sta,
1196 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1197 key, NULL);
1198 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1199 NL80211_IFTYPE_STATION);
1200 }
1201
1202 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1203 key = wiphy_dereference(local->hw.wiphy, sta->ptk[i]);
1204 if (!key)
1205 continue;
1206 ieee80211_key_replace(key->sdata, NULL, key->sta,
1207 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1208 key, NULL);
1209 __ieee80211_key_destroy(key, key->sdata->vif.type ==
1210 NL80211_IFTYPE_STATION);
1211 }
1212 }
1213
ieee80211_delayed_tailroom_dec(struct wiphy * wiphy,struct wiphy_work * wk)1214 void ieee80211_delayed_tailroom_dec(struct wiphy *wiphy,
1215 struct wiphy_work *wk)
1216 {
1217 struct ieee80211_sub_if_data *sdata;
1218
1219 sdata = container_of(wk, struct ieee80211_sub_if_data,
1220 dec_tailroom_needed_wk.work);
1221
1222 /*
1223 * The reason for the delayed tailroom needed decrementing is to
1224 * make roaming faster: during roaming, all keys are first deleted
1225 * and then new keys are installed. The first new key causes the
1226 * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
1227 * the cost of synchronize_net() (which can be slow). Avoid this
1228 * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
1229 * key removal for a while, so if we roam the value is larger than
1230 * zero and no 0->1 transition happens.
1231 *
1232 * The cost is that if the AP switching was from an AP with keys
1233 * to one without, we still allocate tailroom while it would no
1234 * longer be needed. However, in the typical (fast) roaming case
1235 * within an ESS this usually won't happen.
1236 */
1237
1238 decrease_tailroom_need_count(sdata,
1239 sdata->crypto_tx_tailroom_pending_dec);
1240 sdata->crypto_tx_tailroom_pending_dec = 0;
1241 }
1242
ieee80211_gtk_rekey_notify(struct ieee80211_vif * vif,const u8 * bssid,const u8 * replay_ctr,gfp_t gfp)1243 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
1244 const u8 *replay_ctr, gfp_t gfp)
1245 {
1246 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1247
1248 trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
1249
1250 cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
1251 }
1252 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
1253
ieee80211_get_key_rx_seq(struct ieee80211_key_conf * keyconf,int tid,struct ieee80211_key_seq * seq)1254 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
1255 int tid, struct ieee80211_key_seq *seq)
1256 {
1257 struct ieee80211_key *key;
1258 const u8 *pn;
1259
1260 key = container_of(keyconf, struct ieee80211_key, conf);
1261
1262 switch (key->conf.cipher) {
1263 case WLAN_CIPHER_SUITE_TKIP:
1264 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1265 return;
1266 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
1267 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
1268 break;
1269 case WLAN_CIPHER_SUITE_CCMP:
1270 case WLAN_CIPHER_SUITE_CCMP_256:
1271 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1272 return;
1273 if (tid < 0)
1274 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1275 else
1276 pn = key->u.ccmp.rx_pn[tid];
1277 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
1278 break;
1279 case WLAN_CIPHER_SUITE_AES_CMAC:
1280 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1281 if (WARN_ON(tid != 0))
1282 return;
1283 pn = key->u.aes_cmac.rx_pn;
1284 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
1285 break;
1286 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1287 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1288 if (WARN_ON(tid != 0))
1289 return;
1290 pn = key->u.aes_gmac.rx_pn;
1291 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
1292 break;
1293 case WLAN_CIPHER_SUITE_GCMP:
1294 case WLAN_CIPHER_SUITE_GCMP_256:
1295 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1296 return;
1297 if (tid < 0)
1298 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1299 else
1300 pn = key->u.gcmp.rx_pn[tid];
1301 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
1302 break;
1303 }
1304 }
1305 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
1306
ieee80211_set_key_rx_seq(struct ieee80211_key_conf * keyconf,int tid,struct ieee80211_key_seq * seq)1307 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1308 int tid, struct ieee80211_key_seq *seq)
1309 {
1310 struct ieee80211_key *key;
1311 u8 *pn;
1312
1313 key = container_of(keyconf, struct ieee80211_key, conf);
1314
1315 switch (key->conf.cipher) {
1316 case WLAN_CIPHER_SUITE_TKIP:
1317 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1318 return;
1319 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1320 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1321 break;
1322 case WLAN_CIPHER_SUITE_CCMP:
1323 case WLAN_CIPHER_SUITE_CCMP_256:
1324 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1325 return;
1326 if (tid < 0)
1327 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1328 else
1329 pn = key->u.ccmp.rx_pn[tid];
1330 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1331 break;
1332 case WLAN_CIPHER_SUITE_AES_CMAC:
1333 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1334 if (WARN_ON(tid != 0))
1335 return;
1336 pn = key->u.aes_cmac.rx_pn;
1337 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1338 break;
1339 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1340 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1341 if (WARN_ON(tid != 0))
1342 return;
1343 pn = key->u.aes_gmac.rx_pn;
1344 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1345 break;
1346 case WLAN_CIPHER_SUITE_GCMP:
1347 case WLAN_CIPHER_SUITE_GCMP_256:
1348 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1349 return;
1350 if (tid < 0)
1351 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1352 else
1353 pn = key->u.gcmp.rx_pn[tid];
1354 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1355 break;
1356 default:
1357 WARN_ON(1);
1358 break;
1359 }
1360 }
1361 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1362
1363 struct ieee80211_key_conf *
ieee80211_gtk_rekey_add(struct ieee80211_vif * vif,u8 idx,u8 * key_data,u8 key_len,int link_id)1364 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1365 u8 idx, u8 *key_data, u8 key_len,
1366 int link_id)
1367 {
1368 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1369 struct ieee80211_local *local = sdata->local;
1370 struct ieee80211_key *prev_key;
1371 struct ieee80211_key *key;
1372 int err;
1373 struct ieee80211_link_data *link_data =
1374 link_id < 0 ? &sdata->deflink :
1375 sdata_dereference(sdata->link[link_id], sdata);
1376
1377 if (WARN_ON(!link_data))
1378 return ERR_PTR(-EINVAL);
1379
1380 if (WARN_ON(!local->wowlan))
1381 return ERR_PTR(-EINVAL);
1382
1383 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1384 return ERR_PTR(-EINVAL);
1385
1386 if (WARN_ON(idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
1387 NUM_DEFAULT_BEACON_KEYS))
1388 return ERR_PTR(-EINVAL);
1389
1390 prev_key = wiphy_dereference(local->hw.wiphy,
1391 link_data->gtk[idx]);
1392 if (!prev_key) {
1393 if (idx < NUM_DEFAULT_KEYS) {
1394 for (int i = 0; i < NUM_DEFAULT_KEYS; i++) {
1395 if (i == idx)
1396 continue;
1397 prev_key = wiphy_dereference(local->hw.wiphy,
1398 link_data->gtk[i]);
1399 if (prev_key)
1400 break;
1401 }
1402 } else {
1403 /* For IGTK we have 4 and 5 and for BIGTK - 6 and 7 */
1404 prev_key = wiphy_dereference(local->hw.wiphy,
1405 link_data->gtk[idx ^ 1]);
1406 }
1407 }
1408
1409 if (WARN_ON(!prev_key))
1410 return ERR_PTR(-EINVAL);
1411
1412 if (WARN_ON(key_len < prev_key->conf.keylen))
1413 return ERR_PTR(-EINVAL);
1414
1415 key = ieee80211_key_alloc(prev_key->conf.cipher, idx,
1416 prev_key->conf.keylen, key_data,
1417 0, NULL);
1418 if (IS_ERR(key))
1419 return ERR_CAST(key);
1420
1421 if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1422 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1423
1424 key->conf.link_id = link_data->link_id;
1425
1426 err = ieee80211_key_link(key, link_data, NULL);
1427 if (err)
1428 return ERR_PTR(err);
1429
1430 return &key->conf;
1431 }
1432 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);
1433
ieee80211_key_mic_failure(struct ieee80211_key_conf * keyconf)1434 void ieee80211_key_mic_failure(struct ieee80211_key_conf *keyconf)
1435 {
1436 struct ieee80211_key *key;
1437
1438 key = container_of(keyconf, struct ieee80211_key, conf);
1439
1440 switch (key->conf.cipher) {
1441 case WLAN_CIPHER_SUITE_AES_CMAC:
1442 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1443 key->u.aes_cmac.icverrors++;
1444 break;
1445 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1446 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1447 key->u.aes_gmac.icverrors++;
1448 break;
1449 default:
1450 /* ignore the others for now, we don't keep counters now */
1451 break;
1452 }
1453 }
1454 EXPORT_SYMBOL_GPL(ieee80211_key_mic_failure);
1455
ieee80211_key_replay(struct ieee80211_key_conf * keyconf)1456 void ieee80211_key_replay(struct ieee80211_key_conf *keyconf)
1457 {
1458 struct ieee80211_key *key;
1459
1460 key = container_of(keyconf, struct ieee80211_key, conf);
1461
1462 switch (key->conf.cipher) {
1463 case WLAN_CIPHER_SUITE_CCMP:
1464 case WLAN_CIPHER_SUITE_CCMP_256:
1465 key->u.ccmp.replays++;
1466 break;
1467 case WLAN_CIPHER_SUITE_AES_CMAC:
1468 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1469 key->u.aes_cmac.replays++;
1470 break;
1471 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1472 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1473 key->u.aes_gmac.replays++;
1474 break;
1475 case WLAN_CIPHER_SUITE_GCMP:
1476 case WLAN_CIPHER_SUITE_GCMP_256:
1477 key->u.gcmp.replays++;
1478 break;
1479 }
1480 }
1481 EXPORT_SYMBOL_GPL(ieee80211_key_replay);
1482
ieee80211_key_switch_links(struct ieee80211_sub_if_data * sdata,unsigned long del_links_mask,unsigned long add_links_mask)1483 int ieee80211_key_switch_links(struct ieee80211_sub_if_data *sdata,
1484 unsigned long del_links_mask,
1485 unsigned long add_links_mask)
1486 {
1487 struct ieee80211_key *key;
1488 int ret;
1489
1490 list_for_each_entry(key, &sdata->key_list, list) {
1491 if (key->conf.link_id < 0 ||
1492 !(del_links_mask & BIT(key->conf.link_id)))
1493 continue;
1494
1495 /* shouldn't happen for per-link keys */
1496 WARN_ON(key->sta);
1497
1498 ieee80211_key_disable_hw_accel(key);
1499 }
1500
1501 list_for_each_entry(key, &sdata->key_list, list) {
1502 if (key->conf.link_id < 0 ||
1503 !(add_links_mask & BIT(key->conf.link_id)))
1504 continue;
1505
1506 /* shouldn't happen for per-link keys */
1507 WARN_ON(key->sta);
1508
1509 ret = ieee80211_key_enable_hw_accel(key);
1510 if (ret)
1511 return ret;
1512 }
1513
1514 return 0;
1515 }
1516