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  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 	if (key->conf.link_id >= 0 && sdata->vif.active_links &&
181 	    !(sdata->vif.active_links & BIT(key->conf.link_id)))
182 		return 0;
183 
184 	ret = drv_set_key(key->local, SET_KEY, sdata,
185 			  sta ? &sta->sta : NULL, &key->conf);
186 
187 	if (!ret) {
188 		key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
189 
190 		if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
191 					 IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
192 					 IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
193 			decrease_tailroom_need_count(sdata, 1);
194 
195 		WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
196 			(key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
197 
198 		WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) &&
199 			(key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC));
200 
201 		return 0;
202 	}
203 
204 	if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1)
205 		sdata_err(sdata,
206 			  "failed to set key (%d, %pM) to hardware (%d)\n",
207 			  key->conf.keyidx,
208 			  sta ? sta->sta.addr : bcast_addr, ret);
209 
210  out_unsupported:
211 	switch (key->conf.cipher) {
212 	case WLAN_CIPHER_SUITE_WEP40:
213 	case WLAN_CIPHER_SUITE_WEP104:
214 	case WLAN_CIPHER_SUITE_TKIP:
215 	case WLAN_CIPHER_SUITE_CCMP:
216 	case WLAN_CIPHER_SUITE_CCMP_256:
217 	case WLAN_CIPHER_SUITE_GCMP:
218 	case WLAN_CIPHER_SUITE_GCMP_256:
219 	case WLAN_CIPHER_SUITE_AES_CMAC:
220 	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
221 	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
222 	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
223 		/* all of these we can do in software - if driver can */
224 		if (ret == 1)
225 			return 0;
226 		if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL))
227 			return -EINVAL;
228 		return 0;
229 	default:
230 		return -EINVAL;
231 	}
232 }
233 
ieee80211_key_disable_hw_accel(struct ieee80211_key * key)234 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
235 {
236 	struct ieee80211_sub_if_data *sdata;
237 	struct sta_info *sta;
238 	int ret;
239 
240 	might_sleep();
241 
242 	if (!key || !key->local->ops->set_key)
243 		return;
244 
245 	assert_key_lock(key->local);
246 
247 	if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
248 		return;
249 
250 	sta = key->sta;
251 	sdata = key->sdata;
252 
253 	if (key->conf.link_id >= 0 && sdata->vif.active_links &&
254 	    !(sdata->vif.active_links & BIT(key->conf.link_id)))
255 		return;
256 
257 	if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
258 				 IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
259 				 IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
260 		increment_tailroom_need_count(sdata);
261 
262 	key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
263 	ret = drv_set_key(key->local, DISABLE_KEY, sdata,
264 			  sta ? &sta->sta : NULL, &key->conf);
265 
266 	if (ret)
267 		sdata_err(sdata,
268 			  "failed to remove key (%d, %pM) from hardware (%d)\n",
269 			  key->conf.keyidx,
270 			  sta ? sta->sta.addr : bcast_addr, ret);
271 }
272 
_ieee80211_set_tx_key(struct ieee80211_key * key,bool force)273 static int _ieee80211_set_tx_key(struct ieee80211_key *key, bool force)
274 {
275 	struct sta_info *sta = key->sta;
276 	struct ieee80211_local *local = key->local;
277 
278 	assert_key_lock(local);
279 
280 	set_sta_flag(sta, WLAN_STA_USES_ENCRYPTION);
281 
282 	sta->ptk_idx = key->conf.keyidx;
283 
284 	if (force || !ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT))
285 		clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
286 	ieee80211_check_fast_xmit(sta);
287 
288 	return 0;
289 }
290 
ieee80211_set_tx_key(struct ieee80211_key * key)291 int ieee80211_set_tx_key(struct ieee80211_key *key)
292 {
293 	return _ieee80211_set_tx_key(key, false);
294 }
295 
ieee80211_pairwise_rekey(struct ieee80211_key * old,struct ieee80211_key * new)296 static void ieee80211_pairwise_rekey(struct ieee80211_key *old,
297 				     struct ieee80211_key *new)
298 {
299 	struct ieee80211_local *local = new->local;
300 	struct sta_info *sta = new->sta;
301 	int i;
302 
303 	assert_key_lock(local);
304 
305 	if (new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX) {
306 		/* Extended Key ID key install, initial one or rekey */
307 
308 		if (sta->ptk_idx != INVALID_PTK_KEYIDX &&
309 		    !ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT)) {
310 			/* Aggregation Sessions with Extended Key ID must not
311 			 * mix MPDUs with different keyIDs within one A-MPDU.
312 			 * Tear down running Tx aggregation sessions and block
313 			 * new Rx/Tx aggregation requests during rekey to
314 			 * ensure there are no A-MPDUs when the driver is not
315 			 * supporting A-MPDU key borders. (Blocking Tx only
316 			 * would be sufficient but WLAN_STA_BLOCK_BA gets the
317 			 * job done for the few ms we need it.)
318 			 */
319 			set_sta_flag(sta, WLAN_STA_BLOCK_BA);
320 			mutex_lock(&sta->ampdu_mlme.mtx);
321 			for (i = 0; i <  IEEE80211_NUM_TIDS; i++)
322 				___ieee80211_stop_tx_ba_session(sta, i,
323 								AGG_STOP_LOCAL_REQUEST);
324 			mutex_unlock(&sta->ampdu_mlme.mtx);
325 		}
326 	} else if (old) {
327 		/* Rekey without Extended Key ID.
328 		 * Aggregation sessions are OK when running on SW crypto.
329 		 * A broken remote STA may cause issues not observed with HW
330 		 * crypto, though.
331 		 */
332 		if (!(old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
333 			return;
334 
335 		/* Stop Tx till we are on the new key */
336 		old->flags |= KEY_FLAG_TAINTED;
337 		ieee80211_clear_fast_xmit(sta);
338 		if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
339 			set_sta_flag(sta, WLAN_STA_BLOCK_BA);
340 			ieee80211_sta_tear_down_BA_sessions(sta,
341 							    AGG_STOP_LOCAL_REQUEST);
342 		}
343 		if (!wiphy_ext_feature_isset(local->hw.wiphy,
344 					     NL80211_EXT_FEATURE_CAN_REPLACE_PTK0)) {
345 			pr_warn_ratelimited("Rekeying PTK for STA %pM but driver can't safely do that.",
346 					    sta->sta.addr);
347 			/* Flushing the driver queues *may* help prevent
348 			 * the clear text leaks and freezes.
349 			 */
350 			ieee80211_flush_queues(local, old->sdata, false);
351 		}
352 	}
353 }
354 
__ieee80211_set_default_key(struct ieee80211_link_data * link,int idx,bool uni,bool multi)355 static void __ieee80211_set_default_key(struct ieee80211_link_data *link,
356 					int idx, bool uni, bool multi)
357 {
358 	struct ieee80211_sub_if_data *sdata = link->sdata;
359 	struct ieee80211_key *key = NULL;
360 
361 	assert_key_lock(sdata->local);
362 
363 	if (idx >= 0 && idx < NUM_DEFAULT_KEYS) {
364 		key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
365 		if (!key)
366 			key = key_mtx_dereference(sdata->local, link->gtk[idx]);
367 	}
368 
369 	if (uni) {
370 		rcu_assign_pointer(sdata->default_unicast_key, key);
371 		ieee80211_check_fast_xmit_iface(sdata);
372 		if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
373 			drv_set_default_unicast_key(sdata->local, sdata, idx);
374 	}
375 
376 	if (multi)
377 		rcu_assign_pointer(link->default_multicast_key, key);
378 
379 	ieee80211_debugfs_key_update_default(sdata);
380 }
381 
ieee80211_set_default_key(struct ieee80211_link_data * link,int idx,bool uni,bool multi)382 void ieee80211_set_default_key(struct ieee80211_link_data *link, int idx,
383 			       bool uni, bool multi)
384 {
385 	mutex_lock(&link->sdata->local->key_mtx);
386 	__ieee80211_set_default_key(link, idx, uni, multi);
387 	mutex_unlock(&link->sdata->local->key_mtx);
388 }
389 
390 static void
__ieee80211_set_default_mgmt_key(struct ieee80211_link_data * link,int idx)391 __ieee80211_set_default_mgmt_key(struct ieee80211_link_data *link, int idx)
392 {
393 	struct ieee80211_sub_if_data *sdata = link->sdata;
394 	struct ieee80211_key *key = NULL;
395 
396 	assert_key_lock(sdata->local);
397 
398 	if (idx >= NUM_DEFAULT_KEYS &&
399 	    idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
400 		key = key_mtx_dereference(sdata->local, link->gtk[idx]);
401 
402 	rcu_assign_pointer(link->default_mgmt_key, key);
403 
404 	ieee80211_debugfs_key_update_default(sdata);
405 }
406 
ieee80211_set_default_mgmt_key(struct ieee80211_link_data * link,int idx)407 void ieee80211_set_default_mgmt_key(struct ieee80211_link_data *link,
408 				    int idx)
409 {
410 	mutex_lock(&link->sdata->local->key_mtx);
411 	__ieee80211_set_default_mgmt_key(link, idx);
412 	mutex_unlock(&link->sdata->local->key_mtx);
413 }
414 
415 static void
__ieee80211_set_default_beacon_key(struct ieee80211_link_data * link,int idx)416 __ieee80211_set_default_beacon_key(struct ieee80211_link_data *link, int idx)
417 {
418 	struct ieee80211_sub_if_data *sdata = link->sdata;
419 	struct ieee80211_key *key = NULL;
420 
421 	assert_key_lock(sdata->local);
422 
423 	if (idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS &&
424 	    idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
425 	    NUM_DEFAULT_BEACON_KEYS)
426 		key = key_mtx_dereference(sdata->local, link->gtk[idx]);
427 
428 	rcu_assign_pointer(link->default_beacon_key, key);
429 
430 	ieee80211_debugfs_key_update_default(sdata);
431 }
432 
ieee80211_set_default_beacon_key(struct ieee80211_link_data * link,int idx)433 void ieee80211_set_default_beacon_key(struct ieee80211_link_data *link,
434 				      int idx)
435 {
436 	mutex_lock(&link->sdata->local->key_mtx);
437 	__ieee80211_set_default_beacon_key(link, idx);
438 	mutex_unlock(&link->sdata->local->key_mtx);
439 }
440 
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)441 static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
442 				 struct ieee80211_link_data *link,
443 				 struct sta_info *sta,
444 				 bool pairwise,
445 				 struct ieee80211_key *old,
446 				 struct ieee80211_key *new)
447 {
448 	struct link_sta_info *link_sta = sta ? &sta->deflink : NULL;
449 	int link_id;
450 	int idx;
451 	int ret = 0;
452 	bool defunikey, defmultikey, defmgmtkey, defbeaconkey;
453 	bool is_wep;
454 
455 	/* caller must provide at least one old/new */
456 	if (WARN_ON(!new && !old))
457 		return 0;
458 
459 	if (new) {
460 		idx = new->conf.keyidx;
461 		is_wep = new->conf.cipher == WLAN_CIPHER_SUITE_WEP40 ||
462 			 new->conf.cipher == WLAN_CIPHER_SUITE_WEP104;
463 		link_id = new->conf.link_id;
464 	} else {
465 		idx = old->conf.keyidx;
466 		is_wep = old->conf.cipher == WLAN_CIPHER_SUITE_WEP40 ||
467 			 old->conf.cipher == WLAN_CIPHER_SUITE_WEP104;
468 		link_id = old->conf.link_id;
469 	}
470 
471 	if (WARN(old && old->conf.link_id != link_id,
472 		 "old link ID %d doesn't match new link ID %d\n",
473 		 old->conf.link_id, link_id))
474 		return -EINVAL;
475 
476 	if (link_id >= 0) {
477 		if (!link) {
478 			link = sdata_dereference(sdata->link[link_id], sdata);
479 			if (!link)
480 				return -ENOLINK;
481 		}
482 
483 		if (sta) {
484 			link_sta = rcu_dereference_protected(sta->link[link_id],
485 							     lockdep_is_held(&sta->local->sta_mtx));
486 			if (!link_sta)
487 				return -ENOLINK;
488 		}
489 	} else {
490 		link = &sdata->deflink;
491 	}
492 
493 	if ((is_wep || pairwise) && idx >= NUM_DEFAULT_KEYS)
494 		return -EINVAL;
495 
496 	WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
497 
498 	if (new && sta && pairwise) {
499 		/* Unicast rekey needs special handling. With Extended Key ID
500 		 * old is still NULL for the first rekey.
501 		 */
502 		ieee80211_pairwise_rekey(old, new);
503 	}
504 
505 	if (old) {
506 		if (old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
507 			ieee80211_key_disable_hw_accel(old);
508 
509 			if (new)
510 				ret = ieee80211_key_enable_hw_accel(new);
511 		}
512 	} else {
513 		if (!new->local->wowlan)
514 			ret = ieee80211_key_enable_hw_accel(new);
515 	}
516 
517 	if (ret)
518 		return ret;
519 
520 	if (new)
521 		list_add_tail_rcu(&new->list, &sdata->key_list);
522 
523 	if (sta) {
524 		if (pairwise) {
525 			rcu_assign_pointer(sta->ptk[idx], new);
526 			if (new &&
527 			    !(new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX))
528 				_ieee80211_set_tx_key(new, true);
529 		} else {
530 			rcu_assign_pointer(link_sta->gtk[idx], new);
531 		}
532 		/* Only needed for transition from no key -> key.
533 		 * Still triggers unnecessary when using Extended Key ID
534 		 * and installing the second key ID the first time.
535 		 */
536 		if (new && !old)
537 			ieee80211_check_fast_rx(sta);
538 	} else {
539 		defunikey = old &&
540 			old == key_mtx_dereference(sdata->local,
541 						sdata->default_unicast_key);
542 		defmultikey = old &&
543 			old == key_mtx_dereference(sdata->local,
544 						   link->default_multicast_key);
545 		defmgmtkey = old &&
546 			old == key_mtx_dereference(sdata->local,
547 						   link->default_mgmt_key);
548 		defbeaconkey = old &&
549 			old == key_mtx_dereference(sdata->local,
550 						   link->default_beacon_key);
551 
552 		if (defunikey && !new)
553 			__ieee80211_set_default_key(link, -1, true, false);
554 		if (defmultikey && !new)
555 			__ieee80211_set_default_key(link, -1, false, true);
556 		if (defmgmtkey && !new)
557 			__ieee80211_set_default_mgmt_key(link, -1);
558 		if (defbeaconkey && !new)
559 			__ieee80211_set_default_beacon_key(link, -1);
560 
561 		if (is_wep || pairwise)
562 			rcu_assign_pointer(sdata->keys[idx], new);
563 		else
564 			rcu_assign_pointer(link->gtk[idx], new);
565 
566 		if (defunikey && new)
567 			__ieee80211_set_default_key(link, new->conf.keyidx,
568 						    true, false);
569 		if (defmultikey && new)
570 			__ieee80211_set_default_key(link, new->conf.keyidx,
571 						    false, true);
572 		if (defmgmtkey && new)
573 			__ieee80211_set_default_mgmt_key(link,
574 							 new->conf.keyidx);
575 		if (defbeaconkey && new)
576 			__ieee80211_set_default_beacon_key(link,
577 							   new->conf.keyidx);
578 	}
579 
580 	if (old)
581 		list_del_rcu(&old->list);
582 
583 	return 0;
584 }
585 
586 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)587 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
588 		    const u8 *key_data,
589 		    size_t seq_len, const u8 *seq)
590 {
591 	struct ieee80211_key *key;
592 	int i, j, err;
593 
594 	if (WARN_ON(idx < 0 ||
595 		    idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
596 		    NUM_DEFAULT_BEACON_KEYS))
597 		return ERR_PTR(-EINVAL);
598 
599 	key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
600 	if (!key)
601 		return ERR_PTR(-ENOMEM);
602 
603 	/*
604 	 * Default to software encryption; we'll later upload the
605 	 * key to the hardware if possible.
606 	 */
607 	key->conf.flags = 0;
608 	key->flags = 0;
609 
610 	key->conf.link_id = -1;
611 	key->conf.cipher = cipher;
612 	key->conf.keyidx = idx;
613 	key->conf.keylen = key_len;
614 	switch (cipher) {
615 	case WLAN_CIPHER_SUITE_WEP40:
616 	case WLAN_CIPHER_SUITE_WEP104:
617 		key->conf.iv_len = IEEE80211_WEP_IV_LEN;
618 		key->conf.icv_len = IEEE80211_WEP_ICV_LEN;
619 		break;
620 	case WLAN_CIPHER_SUITE_TKIP:
621 		key->conf.iv_len = IEEE80211_TKIP_IV_LEN;
622 		key->conf.icv_len = IEEE80211_TKIP_ICV_LEN;
623 		if (seq) {
624 			for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
625 				key->u.tkip.rx[i].iv32 =
626 					get_unaligned_le32(&seq[2]);
627 				key->u.tkip.rx[i].iv16 =
628 					get_unaligned_le16(seq);
629 			}
630 		}
631 		spin_lock_init(&key->u.tkip.txlock);
632 		break;
633 	case WLAN_CIPHER_SUITE_CCMP:
634 		key->conf.iv_len = IEEE80211_CCMP_HDR_LEN;
635 		key->conf.icv_len = IEEE80211_CCMP_MIC_LEN;
636 		if (seq) {
637 			for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
638 				for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++)
639 					key->u.ccmp.rx_pn[i][j] =
640 						seq[IEEE80211_CCMP_PN_LEN - j - 1];
641 		}
642 		/*
643 		 * Initialize AES key state here as an optimization so that
644 		 * it does not need to be initialized for every packet.
645 		 */
646 		key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
647 			key_data, key_len, IEEE80211_CCMP_MIC_LEN);
648 		if (IS_ERR(key->u.ccmp.tfm)) {
649 			err = PTR_ERR(key->u.ccmp.tfm);
650 			kfree(key);
651 			return ERR_PTR(err);
652 		}
653 		break;
654 	case WLAN_CIPHER_SUITE_CCMP_256:
655 		key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN;
656 		key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN;
657 		for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
658 			for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++)
659 				key->u.ccmp.rx_pn[i][j] =
660 					seq[IEEE80211_CCMP_256_PN_LEN - j - 1];
661 		/* Initialize AES key state here as an optimization so that
662 		 * it does not need to be initialized for every packet.
663 		 */
664 		key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
665 			key_data, key_len, IEEE80211_CCMP_256_MIC_LEN);
666 		if (IS_ERR(key->u.ccmp.tfm)) {
667 			err = PTR_ERR(key->u.ccmp.tfm);
668 			kfree(key);
669 			return ERR_PTR(err);
670 		}
671 		break;
672 	case WLAN_CIPHER_SUITE_AES_CMAC:
673 	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
674 		key->conf.iv_len = 0;
675 		if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
676 			key->conf.icv_len = sizeof(struct ieee80211_mmie);
677 		else
678 			key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
679 		if (seq)
680 			for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
681 				key->u.aes_cmac.rx_pn[j] =
682 					seq[IEEE80211_CMAC_PN_LEN - j - 1];
683 		/*
684 		 * Initialize AES key state here as an optimization so that
685 		 * it does not need to be initialized for every packet.
686 		 */
687 		key->u.aes_cmac.tfm =
688 			ieee80211_aes_cmac_key_setup(key_data, key_len);
689 		if (IS_ERR(key->u.aes_cmac.tfm)) {
690 			err = PTR_ERR(key->u.aes_cmac.tfm);
691 			kfree(key);
692 			return ERR_PTR(err);
693 		}
694 		break;
695 	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
696 	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
697 		key->conf.iv_len = 0;
698 		key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
699 		if (seq)
700 			for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++)
701 				key->u.aes_gmac.rx_pn[j] =
702 					seq[IEEE80211_GMAC_PN_LEN - j - 1];
703 		/* Initialize AES key state here as an optimization so that
704 		 * it does not need to be initialized for every packet.
705 		 */
706 		key->u.aes_gmac.tfm =
707 			ieee80211_aes_gmac_key_setup(key_data, key_len);
708 		if (IS_ERR(key->u.aes_gmac.tfm)) {
709 			err = PTR_ERR(key->u.aes_gmac.tfm);
710 			kfree(key);
711 			return ERR_PTR(err);
712 		}
713 		break;
714 	case WLAN_CIPHER_SUITE_GCMP:
715 	case WLAN_CIPHER_SUITE_GCMP_256:
716 		key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
717 		key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
718 		for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
719 			for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
720 				key->u.gcmp.rx_pn[i][j] =
721 					seq[IEEE80211_GCMP_PN_LEN - j - 1];
722 		/* Initialize AES key state here as an optimization so that
723 		 * it does not need to be initialized for every packet.
724 		 */
725 		key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
726 								      key_len);
727 		if (IS_ERR(key->u.gcmp.tfm)) {
728 			err = PTR_ERR(key->u.gcmp.tfm);
729 			kfree(key);
730 			return ERR_PTR(err);
731 		}
732 		break;
733 	}
734 	memcpy(key->conf.key, key_data, key_len);
735 	INIT_LIST_HEAD(&key->list);
736 
737 	return key;
738 }
739 
ieee80211_key_free_common(struct ieee80211_key * key)740 static void ieee80211_key_free_common(struct ieee80211_key *key)
741 {
742 	switch (key->conf.cipher) {
743 	case WLAN_CIPHER_SUITE_CCMP:
744 	case WLAN_CIPHER_SUITE_CCMP_256:
745 		ieee80211_aes_key_free(key->u.ccmp.tfm);
746 		break;
747 	case WLAN_CIPHER_SUITE_AES_CMAC:
748 	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
749 		ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
750 		break;
751 	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
752 	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
753 		ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm);
754 		break;
755 	case WLAN_CIPHER_SUITE_GCMP:
756 	case WLAN_CIPHER_SUITE_GCMP_256:
757 		ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
758 		break;
759 	}
760 	kfree_sensitive(key);
761 }
762 
__ieee80211_key_destroy(struct ieee80211_key * key,bool delay_tailroom)763 static void __ieee80211_key_destroy(struct ieee80211_key *key,
764 				    bool delay_tailroom)
765 {
766 	if (key->local) {
767 		struct ieee80211_sub_if_data *sdata = key->sdata;
768 
769 		ieee80211_debugfs_key_remove(key);
770 
771 		if (delay_tailroom) {
772 			/* see ieee80211_delayed_tailroom_dec */
773 			sdata->crypto_tx_tailroom_pending_dec++;
774 			schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
775 					      HZ/2);
776 		} else {
777 			decrease_tailroom_need_count(sdata, 1);
778 		}
779 	}
780 
781 	ieee80211_key_free_common(key);
782 }
783 
ieee80211_key_destroy(struct ieee80211_key * key,bool delay_tailroom)784 static void ieee80211_key_destroy(struct ieee80211_key *key,
785 				  bool delay_tailroom)
786 {
787 	if (!key)
788 		return;
789 
790 	/*
791 	 * Synchronize so the TX path and rcu key iterators
792 	 * can no longer be using this key before we free/remove it.
793 	 */
794 	synchronize_net();
795 
796 	__ieee80211_key_destroy(key, delay_tailroom);
797 }
798 
ieee80211_key_free_unused(struct ieee80211_key * key)799 void ieee80211_key_free_unused(struct ieee80211_key *key)
800 {
801 	WARN_ON(key->sdata || key->local);
802 	ieee80211_key_free_common(key);
803 }
804 
ieee80211_key_identical(struct ieee80211_sub_if_data * sdata,struct ieee80211_key * old,struct ieee80211_key * new)805 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata,
806 				    struct ieee80211_key *old,
807 				    struct ieee80211_key *new)
808 {
809 	u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP];
810 	u8 *tk_old, *tk_new;
811 
812 	if (!old || new->conf.keylen != old->conf.keylen)
813 		return false;
814 
815 	tk_old = old->conf.key;
816 	tk_new = new->conf.key;
817 
818 	/*
819 	 * In station mode, don't compare the TX MIC key, as it's never used
820 	 * and offloaded rekeying may not care to send it to the host. This
821 	 * is the case in iwlwifi, for example.
822 	 */
823 	if (sdata->vif.type == NL80211_IFTYPE_STATION &&
824 	    new->conf.cipher == WLAN_CIPHER_SUITE_TKIP &&
825 	    new->conf.keylen == WLAN_KEY_LEN_TKIP &&
826 	    !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
827 		memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP);
828 		memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP);
829 		memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
830 		memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
831 		tk_old = tkip_old;
832 		tk_new = tkip_new;
833 	}
834 
835 	return !crypto_memneq(tk_old, tk_new, new->conf.keylen);
836 }
837 
ieee80211_key_link(struct ieee80211_key * key,struct ieee80211_link_data * link,struct sta_info * sta)838 int ieee80211_key_link(struct ieee80211_key *key,
839 		       struct ieee80211_link_data *link,
840 		       struct sta_info *sta)
841 {
842 	struct ieee80211_sub_if_data *sdata = link->sdata;
843 	static atomic_t key_color = ATOMIC_INIT(0);
844 	struct ieee80211_key *old_key = NULL;
845 	int idx = key->conf.keyidx;
846 	bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
847 	/*
848 	 * We want to delay tailroom updates only for station - in that
849 	 * case it helps roaming speed, but in other cases it hurts and
850 	 * can cause warnings to appear.
851 	 */
852 	bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION;
853 	int ret = -EOPNOTSUPP;
854 
855 	mutex_lock(&sdata->local->key_mtx);
856 
857 	if (sta && pairwise) {
858 		struct ieee80211_key *alt_key;
859 
860 		old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
861 		alt_key = key_mtx_dereference(sdata->local, sta->ptk[idx ^ 1]);
862 
863 		/* The rekey code assumes that the old and new key are using
864 		 * the same cipher. Enforce the assumption for pairwise keys.
865 		 */
866 		if ((alt_key && alt_key->conf.cipher != key->conf.cipher) ||
867 		    (old_key && old_key->conf.cipher != key->conf.cipher))
868 			goto out;
869 	} else if (sta) {
870 		struct link_sta_info *link_sta = &sta->deflink;
871 		int link_id = key->conf.link_id;
872 
873 		if (link_id >= 0) {
874 			link_sta = rcu_dereference_protected(sta->link[link_id],
875 							     lockdep_is_held(&sta->local->sta_mtx));
876 			if (!link_sta) {
877 				ret = -ENOLINK;
878 				goto out;
879 			}
880 		}
881 
882 		old_key = key_mtx_dereference(sdata->local, link_sta->gtk[idx]);
883 	} else {
884 		if (idx < NUM_DEFAULT_KEYS)
885 			old_key = key_mtx_dereference(sdata->local,
886 						      sdata->keys[idx]);
887 		if (!old_key)
888 			old_key = key_mtx_dereference(sdata->local,
889 						      link->gtk[idx]);
890 	}
891 
892 	/* Non-pairwise keys must also not switch the cipher on rekey */
893 	if (!pairwise) {
894 		if (old_key && old_key->conf.cipher != key->conf.cipher)
895 			goto out;
896 	}
897 
898 	/*
899 	 * Silently accept key re-installation without really installing the
900 	 * new version of the key to avoid nonce reuse or replay issues.
901 	 */
902 	if (ieee80211_key_identical(sdata, old_key, key)) {
903 		ieee80211_key_free_unused(key);
904 		ret = 0;
905 		goto out;
906 	}
907 
908 	key->local = sdata->local;
909 	key->sdata = sdata;
910 	key->sta = sta;
911 
912 	/*
913 	 * Assign a unique ID to every key so we can easily prevent mixed
914 	 * key and fragment cache attacks.
915 	 */
916 	key->color = atomic_inc_return(&key_color);
917 
918 	increment_tailroom_need_count(sdata);
919 
920 	ret = ieee80211_key_replace(sdata, link, sta, pairwise, old_key, key);
921 
922 	if (!ret) {
923 		ieee80211_debugfs_key_add(key);
924 		ieee80211_key_destroy(old_key, delay_tailroom);
925 	} else {
926 		ieee80211_key_free(key, delay_tailroom);
927 	}
928 
929  out:
930 	mutex_unlock(&sdata->local->key_mtx);
931 
932 	return ret;
933 }
934 
ieee80211_key_free(struct ieee80211_key * key,bool delay_tailroom)935 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
936 {
937 	if (!key)
938 		return;
939 
940 	/*
941 	 * Replace key with nothingness if it was ever used.
942 	 */
943 	if (key->sdata)
944 		ieee80211_key_replace(key->sdata, NULL, key->sta,
945 				      key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
946 				      key, NULL);
947 	ieee80211_key_destroy(key, delay_tailroom);
948 }
949 
ieee80211_reenable_keys(struct ieee80211_sub_if_data * sdata)950 void ieee80211_reenable_keys(struct ieee80211_sub_if_data *sdata)
951 {
952 	struct ieee80211_key *key;
953 	struct ieee80211_sub_if_data *vlan;
954 
955 	lockdep_assert_wiphy(sdata->local->hw.wiphy);
956 
957 	mutex_lock(&sdata->local->key_mtx);
958 
959 	sdata->crypto_tx_tailroom_needed_cnt = 0;
960 	sdata->crypto_tx_tailroom_pending_dec = 0;
961 
962 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
963 		list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
964 			vlan->crypto_tx_tailroom_needed_cnt = 0;
965 			vlan->crypto_tx_tailroom_pending_dec = 0;
966 		}
967 	}
968 
969 	if (ieee80211_sdata_running(sdata)) {
970 		list_for_each_entry(key, &sdata->key_list, list) {
971 			increment_tailroom_need_count(sdata);
972 			ieee80211_key_enable_hw_accel(key);
973 		}
974 	}
975 
976 	mutex_unlock(&sdata->local->key_mtx);
977 }
978 
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)979 void ieee80211_iter_keys(struct ieee80211_hw *hw,
980 			 struct ieee80211_vif *vif,
981 			 void (*iter)(struct ieee80211_hw *hw,
982 				      struct ieee80211_vif *vif,
983 				      struct ieee80211_sta *sta,
984 				      struct ieee80211_key_conf *key,
985 				      void *data),
986 			 void *iter_data)
987 {
988 	struct ieee80211_local *local = hw_to_local(hw);
989 	struct ieee80211_key *key, *tmp;
990 	struct ieee80211_sub_if_data *sdata;
991 
992 	lockdep_assert_wiphy(hw->wiphy);
993 
994 	mutex_lock(&local->key_mtx);
995 	if (vif) {
996 		sdata = vif_to_sdata(vif);
997 		list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
998 			iter(hw, &sdata->vif,
999 			     key->sta ? &key->sta->sta : NULL,
1000 			     &key->conf, iter_data);
1001 	} else {
1002 		list_for_each_entry(sdata, &local->interfaces, list)
1003 			list_for_each_entry_safe(key, tmp,
1004 						 &sdata->key_list, list)
1005 				iter(hw, &sdata->vif,
1006 				     key->sta ? &key->sta->sta : NULL,
1007 				     &key->conf, iter_data);
1008 	}
1009 	mutex_unlock(&local->key_mtx);
1010 }
1011 EXPORT_SYMBOL(ieee80211_iter_keys);
1012 
1013 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)1014 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
1015 			 struct ieee80211_sub_if_data *sdata,
1016 			 void (*iter)(struct ieee80211_hw *hw,
1017 				      struct ieee80211_vif *vif,
1018 				      struct ieee80211_sta *sta,
1019 				      struct ieee80211_key_conf *key,
1020 				      void *data),
1021 			 void *iter_data)
1022 {
1023 	struct ieee80211_key *key;
1024 
1025 	list_for_each_entry_rcu(key, &sdata->key_list, list) {
1026 		/* skip keys of station in removal process */
1027 		if (key->sta && key->sta->removed)
1028 			continue;
1029 		if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1030 			continue;
1031 
1032 		iter(hw, &sdata->vif,
1033 		     key->sta ? &key->sta->sta : NULL,
1034 		     &key->conf, iter_data);
1035 	}
1036 }
1037 
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)1038 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
1039 			     struct ieee80211_vif *vif,
1040 			     void (*iter)(struct ieee80211_hw *hw,
1041 					  struct ieee80211_vif *vif,
1042 					  struct ieee80211_sta *sta,
1043 					  struct ieee80211_key_conf *key,
1044 					  void *data),
1045 			     void *iter_data)
1046 {
1047 	struct ieee80211_local *local = hw_to_local(hw);
1048 	struct ieee80211_sub_if_data *sdata;
1049 
1050 	if (vif) {
1051 		sdata = vif_to_sdata(vif);
1052 		_ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
1053 	} else {
1054 		list_for_each_entry_rcu(sdata, &local->interfaces, list)
1055 			_ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
1056 	}
1057 }
1058 EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
1059 
ieee80211_free_keys_iface(struct ieee80211_sub_if_data * sdata,struct list_head * keys)1060 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
1061 				      struct list_head *keys)
1062 {
1063 	struct ieee80211_key *key, *tmp;
1064 
1065 	decrease_tailroom_need_count(sdata,
1066 				     sdata->crypto_tx_tailroom_pending_dec);
1067 	sdata->crypto_tx_tailroom_pending_dec = 0;
1068 
1069 	ieee80211_debugfs_key_remove_mgmt_default(sdata);
1070 	ieee80211_debugfs_key_remove_beacon_default(sdata);
1071 
1072 	list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
1073 		ieee80211_key_replace(key->sdata, NULL, key->sta,
1074 				      key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1075 				      key, NULL);
1076 		list_add_tail(&key->list, keys);
1077 	}
1078 
1079 	ieee80211_debugfs_key_update_default(sdata);
1080 }
1081 
ieee80211_remove_link_keys(struct ieee80211_link_data * link,struct list_head * keys)1082 void ieee80211_remove_link_keys(struct ieee80211_link_data *link,
1083 				struct list_head *keys)
1084 {
1085 	struct ieee80211_sub_if_data *sdata = link->sdata;
1086 	struct ieee80211_local *local = sdata->local;
1087 	struct ieee80211_key *key, *tmp;
1088 
1089 	mutex_lock(&local->key_mtx);
1090 	list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
1091 		if (key->conf.link_id != link->link_id)
1092 			continue;
1093 		ieee80211_key_replace(key->sdata, link, key->sta,
1094 				      key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1095 				      key, NULL);
1096 		list_add_tail(&key->list, keys);
1097 	}
1098 	mutex_unlock(&local->key_mtx);
1099 }
1100 
ieee80211_free_key_list(struct ieee80211_local * local,struct list_head * keys)1101 void ieee80211_free_key_list(struct ieee80211_local *local,
1102 			     struct list_head *keys)
1103 {
1104 	struct ieee80211_key *key, *tmp;
1105 
1106 	mutex_lock(&local->key_mtx);
1107 	list_for_each_entry_safe(key, tmp, keys, list)
1108 		__ieee80211_key_destroy(key, false);
1109 	mutex_unlock(&local->key_mtx);
1110 }
1111 
ieee80211_free_keys(struct ieee80211_sub_if_data * sdata,bool force_synchronize)1112 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
1113 			 bool force_synchronize)
1114 {
1115 	struct ieee80211_local *local = sdata->local;
1116 	struct ieee80211_sub_if_data *vlan;
1117 	struct ieee80211_sub_if_data *master;
1118 	struct ieee80211_key *key, *tmp;
1119 	LIST_HEAD(keys);
1120 
1121 	cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
1122 
1123 	mutex_lock(&local->key_mtx);
1124 
1125 	ieee80211_free_keys_iface(sdata, &keys);
1126 
1127 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
1128 		list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1129 			ieee80211_free_keys_iface(vlan, &keys);
1130 	}
1131 
1132 	if (!list_empty(&keys) || force_synchronize)
1133 		synchronize_net();
1134 	list_for_each_entry_safe(key, tmp, &keys, list)
1135 		__ieee80211_key_destroy(key, false);
1136 
1137 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1138 		if (sdata->bss) {
1139 			master = container_of(sdata->bss,
1140 					      struct ieee80211_sub_if_data,
1141 					      u.ap);
1142 
1143 			WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
1144 				     master->crypto_tx_tailroom_needed_cnt);
1145 		}
1146 	} else {
1147 		WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
1148 			     sdata->crypto_tx_tailroom_pending_dec);
1149 	}
1150 
1151 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
1152 		list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1153 			WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
1154 				     vlan->crypto_tx_tailroom_pending_dec);
1155 	}
1156 
1157 	mutex_unlock(&local->key_mtx);
1158 }
1159 
ieee80211_free_sta_keys(struct ieee80211_local * local,struct sta_info * sta)1160 void ieee80211_free_sta_keys(struct ieee80211_local *local,
1161 			     struct sta_info *sta)
1162 {
1163 	struct ieee80211_key *key;
1164 	int i;
1165 
1166 	mutex_lock(&local->key_mtx);
1167 	for (i = 0; i < ARRAY_SIZE(sta->deflink.gtk); i++) {
1168 		key = key_mtx_dereference(local, sta->deflink.gtk[i]);
1169 		if (!key)
1170 			continue;
1171 		ieee80211_key_replace(key->sdata, NULL, key->sta,
1172 				      key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1173 				      key, NULL);
1174 		__ieee80211_key_destroy(key, key->sdata->vif.type ==
1175 					NL80211_IFTYPE_STATION);
1176 	}
1177 
1178 	for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1179 		key = key_mtx_dereference(local, sta->ptk[i]);
1180 		if (!key)
1181 			continue;
1182 		ieee80211_key_replace(key->sdata, NULL, key->sta,
1183 				      key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1184 				      key, NULL);
1185 		__ieee80211_key_destroy(key, key->sdata->vif.type ==
1186 					NL80211_IFTYPE_STATION);
1187 	}
1188 
1189 	mutex_unlock(&local->key_mtx);
1190 }
1191 
ieee80211_delayed_tailroom_dec(struct work_struct * wk)1192 void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
1193 {
1194 	struct ieee80211_sub_if_data *sdata;
1195 
1196 	sdata = container_of(wk, struct ieee80211_sub_if_data,
1197 			     dec_tailroom_needed_wk.work);
1198 
1199 	/*
1200 	 * The reason for the delayed tailroom needed decrementing is to
1201 	 * make roaming faster: during roaming, all keys are first deleted
1202 	 * and then new keys are installed. The first new key causes the
1203 	 * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
1204 	 * the cost of synchronize_net() (which can be slow). Avoid this
1205 	 * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
1206 	 * key removal for a while, so if we roam the value is larger than
1207 	 * zero and no 0->1 transition happens.
1208 	 *
1209 	 * The cost is that if the AP switching was from an AP with keys
1210 	 * to one without, we still allocate tailroom while it would no
1211 	 * longer be needed. However, in the typical (fast) roaming case
1212 	 * within an ESS this usually won't happen.
1213 	 */
1214 
1215 	mutex_lock(&sdata->local->key_mtx);
1216 	decrease_tailroom_need_count(sdata,
1217 				     sdata->crypto_tx_tailroom_pending_dec);
1218 	sdata->crypto_tx_tailroom_pending_dec = 0;
1219 	mutex_unlock(&sdata->local->key_mtx);
1220 }
1221 
ieee80211_gtk_rekey_notify(struct ieee80211_vif * vif,const u8 * bssid,const u8 * replay_ctr,gfp_t gfp)1222 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
1223 				const u8 *replay_ctr, gfp_t gfp)
1224 {
1225 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1226 
1227 	trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
1228 
1229 	cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
1230 }
1231 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
1232 
ieee80211_get_key_rx_seq(struct ieee80211_key_conf * keyconf,int tid,struct ieee80211_key_seq * seq)1233 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
1234 			      int tid, struct ieee80211_key_seq *seq)
1235 {
1236 	struct ieee80211_key *key;
1237 	const u8 *pn;
1238 
1239 	key = container_of(keyconf, struct ieee80211_key, conf);
1240 
1241 	switch (key->conf.cipher) {
1242 	case WLAN_CIPHER_SUITE_TKIP:
1243 		if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1244 			return;
1245 		seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
1246 		seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
1247 		break;
1248 	case WLAN_CIPHER_SUITE_CCMP:
1249 	case WLAN_CIPHER_SUITE_CCMP_256:
1250 		if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1251 			return;
1252 		if (tid < 0)
1253 			pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1254 		else
1255 			pn = key->u.ccmp.rx_pn[tid];
1256 		memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
1257 		break;
1258 	case WLAN_CIPHER_SUITE_AES_CMAC:
1259 	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1260 		if (WARN_ON(tid != 0))
1261 			return;
1262 		pn = key->u.aes_cmac.rx_pn;
1263 		memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
1264 		break;
1265 	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1266 	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1267 		if (WARN_ON(tid != 0))
1268 			return;
1269 		pn = key->u.aes_gmac.rx_pn;
1270 		memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
1271 		break;
1272 	case WLAN_CIPHER_SUITE_GCMP:
1273 	case WLAN_CIPHER_SUITE_GCMP_256:
1274 		if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1275 			return;
1276 		if (tid < 0)
1277 			pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1278 		else
1279 			pn = key->u.gcmp.rx_pn[tid];
1280 		memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
1281 		break;
1282 	}
1283 }
1284 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
1285 
ieee80211_set_key_rx_seq(struct ieee80211_key_conf * keyconf,int tid,struct ieee80211_key_seq * seq)1286 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1287 			      int tid, struct ieee80211_key_seq *seq)
1288 {
1289 	struct ieee80211_key *key;
1290 	u8 *pn;
1291 
1292 	key = container_of(keyconf, struct ieee80211_key, conf);
1293 
1294 	switch (key->conf.cipher) {
1295 	case WLAN_CIPHER_SUITE_TKIP:
1296 		if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1297 			return;
1298 		key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1299 		key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1300 		break;
1301 	case WLAN_CIPHER_SUITE_CCMP:
1302 	case WLAN_CIPHER_SUITE_CCMP_256:
1303 		if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1304 			return;
1305 		if (tid < 0)
1306 			pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1307 		else
1308 			pn = key->u.ccmp.rx_pn[tid];
1309 		memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1310 		break;
1311 	case WLAN_CIPHER_SUITE_AES_CMAC:
1312 	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1313 		if (WARN_ON(tid != 0))
1314 			return;
1315 		pn = key->u.aes_cmac.rx_pn;
1316 		memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1317 		break;
1318 	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1319 	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1320 		if (WARN_ON(tid != 0))
1321 			return;
1322 		pn = key->u.aes_gmac.rx_pn;
1323 		memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1324 		break;
1325 	case WLAN_CIPHER_SUITE_GCMP:
1326 	case WLAN_CIPHER_SUITE_GCMP_256:
1327 		if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1328 			return;
1329 		if (tid < 0)
1330 			pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1331 		else
1332 			pn = key->u.gcmp.rx_pn[tid];
1333 		memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1334 		break;
1335 	default:
1336 		WARN_ON(1);
1337 		break;
1338 	}
1339 }
1340 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1341 
ieee80211_remove_key(struct ieee80211_key_conf * keyconf)1342 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1343 {
1344 	struct ieee80211_key *key;
1345 
1346 	key = container_of(keyconf, struct ieee80211_key, conf);
1347 
1348 	assert_key_lock(key->local);
1349 
1350 	/*
1351 	 * if key was uploaded, we assume the driver will/has remove(d)
1352 	 * it, so adjust bookkeeping accordingly
1353 	 */
1354 	if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1355 		key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1356 
1357 		if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
1358 					 IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
1359 					 IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1360 			increment_tailroom_need_count(key->sdata);
1361 	}
1362 
1363 	ieee80211_key_free(key, false);
1364 }
1365 EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1366 
1367 struct ieee80211_key_conf *
ieee80211_gtk_rekey_add(struct ieee80211_vif * vif,struct ieee80211_key_conf * keyconf)1368 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1369 			struct ieee80211_key_conf *keyconf)
1370 {
1371 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1372 	struct ieee80211_local *local = sdata->local;
1373 	struct ieee80211_key *key;
1374 	int err;
1375 
1376 	if (WARN_ON(!local->wowlan))
1377 		return ERR_PTR(-EINVAL);
1378 
1379 	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1380 		return ERR_PTR(-EINVAL);
1381 
1382 	key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1383 				  keyconf->keylen, keyconf->key,
1384 				  0, NULL);
1385 	if (IS_ERR(key))
1386 		return ERR_CAST(key);
1387 
1388 	if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1389 		key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1390 
1391 	/* FIXME: this function needs to get a link ID */
1392 	err = ieee80211_key_link(key, &sdata->deflink, NULL);
1393 	if (err)
1394 		return ERR_PTR(err);
1395 
1396 	return &key->conf;
1397 }
1398 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);
1399 
ieee80211_key_mic_failure(struct ieee80211_key_conf * keyconf)1400 void ieee80211_key_mic_failure(struct ieee80211_key_conf *keyconf)
1401 {
1402 	struct ieee80211_key *key;
1403 
1404 	key = container_of(keyconf, struct ieee80211_key, conf);
1405 
1406 	switch (key->conf.cipher) {
1407 	case WLAN_CIPHER_SUITE_AES_CMAC:
1408 	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1409 		key->u.aes_cmac.icverrors++;
1410 		break;
1411 	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1412 	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1413 		key->u.aes_gmac.icverrors++;
1414 		break;
1415 	default:
1416 		/* ignore the others for now, we don't keep counters now */
1417 		break;
1418 	}
1419 }
1420 EXPORT_SYMBOL_GPL(ieee80211_key_mic_failure);
1421 
ieee80211_key_replay(struct ieee80211_key_conf * keyconf)1422 void ieee80211_key_replay(struct ieee80211_key_conf *keyconf)
1423 {
1424 	struct ieee80211_key *key;
1425 
1426 	key = container_of(keyconf, struct ieee80211_key, conf);
1427 
1428 	switch (key->conf.cipher) {
1429 	case WLAN_CIPHER_SUITE_CCMP:
1430 	case WLAN_CIPHER_SUITE_CCMP_256:
1431 		key->u.ccmp.replays++;
1432 		break;
1433 	case WLAN_CIPHER_SUITE_AES_CMAC:
1434 	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1435 		key->u.aes_cmac.replays++;
1436 		break;
1437 	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1438 	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1439 		key->u.aes_gmac.replays++;
1440 		break;
1441 	case WLAN_CIPHER_SUITE_GCMP:
1442 	case WLAN_CIPHER_SUITE_GCMP_256:
1443 		key->u.gcmp.replays++;
1444 		break;
1445 	}
1446 }
1447 EXPORT_SYMBOL_GPL(ieee80211_key_replay);
1448 
ieee80211_key_switch_links(struct ieee80211_sub_if_data * sdata,unsigned long del_links_mask,unsigned long add_links_mask)1449 int ieee80211_key_switch_links(struct ieee80211_sub_if_data *sdata,
1450 			       unsigned long del_links_mask,
1451 			       unsigned long add_links_mask)
1452 {
1453 	struct ieee80211_key *key;
1454 	int ret;
1455 
1456 	list_for_each_entry(key, &sdata->key_list, list) {
1457 		if (key->conf.link_id < 0 ||
1458 		    !(del_links_mask & BIT(key->conf.link_id)))
1459 			continue;
1460 
1461 		/* shouldn't happen for per-link keys */
1462 		WARN_ON(key->sta);
1463 
1464 		ieee80211_key_disable_hw_accel(key);
1465 	}
1466 
1467 	list_for_each_entry(key, &sdata->key_list, list) {
1468 		if (key->conf.link_id < 0 ||
1469 		    !(add_links_mask & BIT(key->conf.link_id)))
1470 			continue;
1471 
1472 		/* shouldn't happen for per-link keys */
1473 		WARN_ON(key->sta);
1474 
1475 		ret = ieee80211_key_enable_hw_accel(key);
1476 		if (ret)
1477 			return ret;
1478 	}
1479 
1480 	return 0;
1481 }
1482