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1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright 2002-2005, Instant802 Networks, Inc.
4  * Copyright 2005-2006, Devicescape Software, Inc.
5  * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
6  * Copyright 2007-2008	Johannes Berg <johannes@sipsolutions.net>
7  * Copyright 2013-2014  Intel Mobile Communications GmbH
8  * Copyright 2015-2017	Intel Deutschland GmbH
9  * Copyright 2018-2019  Intel Corporation
10  */
11 
12 #include <linux/if_ether.h>
13 #include <linux/etherdevice.h>
14 #include <linux/list.h>
15 #include <linux/rcupdate.h>
16 #include <linux/rtnetlink.h>
17 #include <linux/slab.h>
18 #include <linux/export.h>
19 #include <net/mac80211.h>
20 #include <crypto/algapi.h>
21 #include <asm/unaligned.h>
22 #include "ieee80211_i.h"
23 #include "driver-ops.h"
24 #include "debugfs_key.h"
25 #include "aes_ccm.h"
26 #include "aes_cmac.h"
27 #include "aes_gmac.h"
28 #include "aes_gcm.h"
29 
30 
31 /**
32  * DOC: Key handling basics
33  *
34  * Key handling in mac80211 is done based on per-interface (sub_if_data)
35  * keys and per-station keys. Since each station belongs to an interface,
36  * each station key also belongs to that interface.
37  *
38  * Hardware acceleration is done on a best-effort basis for algorithms
39  * that are implemented in software,  for each key the hardware is asked
40  * to enable that key for offloading but if it cannot do that the key is
41  * simply kept for software encryption (unless it is for an algorithm
42  * that isn't implemented in software).
43  * There is currently no way of knowing whether a key is handled in SW
44  * or HW except by looking into debugfs.
45  *
46  * All key management is internally protected by a mutex. Within all
47  * other parts of mac80211, key references are, just as STA structure
48  * references, protected by RCU. Note, however, that some things are
49  * unprotected, namely the key->sta dereferences within the hardware
50  * acceleration functions. This means that sta_info_destroy() must
51  * remove the key which waits for an RCU grace period.
52  */
53 
54 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
55 
assert_key_lock(struct ieee80211_local * local)56 static void assert_key_lock(struct ieee80211_local *local)
57 {
58 	lockdep_assert_held(&local->key_mtx);
59 }
60 
61 static void
update_vlan_tailroom_need_count(struct ieee80211_sub_if_data * sdata,int delta)62 update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta)
63 {
64 	struct ieee80211_sub_if_data *vlan;
65 
66 	if (sdata->vif.type != NL80211_IFTYPE_AP)
67 		return;
68 
69 	/* crypto_tx_tailroom_needed_cnt is protected by this */
70 	assert_key_lock(sdata->local);
71 
72 	rcu_read_lock();
73 
74 	list_for_each_entry_rcu(vlan, &sdata->u.ap.vlans, u.vlan.list)
75 		vlan->crypto_tx_tailroom_needed_cnt += delta;
76 
77 	rcu_read_unlock();
78 }
79 
increment_tailroom_need_count(struct ieee80211_sub_if_data * sdata)80 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
81 {
82 	/*
83 	 * When this count is zero, SKB resizing for allocating tailroom
84 	 * for IV or MMIC is skipped. But, this check has created two race
85 	 * cases in xmit path while transiting from zero count to one:
86 	 *
87 	 * 1. SKB resize was skipped because no key was added but just before
88 	 * the xmit key is added and SW encryption kicks off.
89 	 *
90 	 * 2. SKB resize was skipped because all the keys were hw planted but
91 	 * just before xmit one of the key is deleted and SW encryption kicks
92 	 * off.
93 	 *
94 	 * In both the above case SW encryption will find not enough space for
95 	 * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
96 	 *
97 	 * Solution has been explained at
98 	 * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
99 	 */
100 
101 	assert_key_lock(sdata->local);
102 
103 	update_vlan_tailroom_need_count(sdata, 1);
104 
105 	if (!sdata->crypto_tx_tailroom_needed_cnt++) {
106 		/*
107 		 * Flush all XMIT packets currently using HW encryption or no
108 		 * encryption at all if the count transition is from 0 -> 1.
109 		 */
110 		synchronize_net();
111 	}
112 }
113 
decrease_tailroom_need_count(struct ieee80211_sub_if_data * sdata,int delta)114 static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata,
115 					 int delta)
116 {
117 	assert_key_lock(sdata->local);
118 
119 	WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta);
120 
121 	update_vlan_tailroom_need_count(sdata, -delta);
122 	sdata->crypto_tx_tailroom_needed_cnt -= delta;
123 }
124 
ieee80211_key_enable_hw_accel(struct ieee80211_key * key)125 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
126 {
127 	struct ieee80211_sub_if_data *sdata = key->sdata;
128 	struct sta_info *sta;
129 	int ret = -EOPNOTSUPP;
130 
131 	might_sleep();
132 
133 	if (key->flags & KEY_FLAG_TAINTED) {
134 		/* If we get here, it's during resume and the key is
135 		 * tainted so shouldn't be used/programmed any more.
136 		 * However, its flags may still indicate that it was
137 		 * programmed into the device (since we're in resume)
138 		 * so clear that flag now to avoid trying to remove
139 		 * it again later.
140 		 */
141 		if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE &&
142 		    !(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
143 					 IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
144 					 IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
145 			increment_tailroom_need_count(sdata);
146 
147 		key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
148 		return -EINVAL;
149 	}
150 
151 	if (!key->local->ops->set_key)
152 		goto out_unsupported;
153 
154 	assert_key_lock(key->local);
155 
156 	sta = key->sta;
157 
158 	/*
159 	 * If this is a per-STA GTK, check if it
160 	 * is supported; if not, return.
161 	 */
162 	if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) &&
163 	    !ieee80211_hw_check(&key->local->hw, SUPPORTS_PER_STA_GTK))
164 		goto out_unsupported;
165 
166 	if (sta && !sta->uploaded)
167 		goto out_unsupported;
168 
169 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
170 		/*
171 		 * The driver doesn't know anything about VLAN interfaces.
172 		 * Hence, don't send GTKs for VLAN interfaces to the driver.
173 		 */
174 		if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
175 			ret = 1;
176 			goto out_unsupported;
177 		}
178 	}
179 
180 	ret = drv_set_key(key->local, SET_KEY, sdata,
181 			  sta ? &sta->sta : NULL, &key->conf);
182 
183 	if (!ret) {
184 		key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
185 
186 		if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
187 					 IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
188 					 IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
189 			decrease_tailroom_need_count(sdata, 1);
190 
191 		WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
192 			(key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
193 
194 		WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) &&
195 			(key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC));
196 
197 		return 0;
198 	}
199 
200 	if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1)
201 		sdata_err(sdata,
202 			  "failed to set key (%d, %pM) to hardware (%d)\n",
203 			  key->conf.keyidx,
204 			  sta ? sta->sta.addr : bcast_addr, ret);
205 
206  out_unsupported:
207 	switch (key->conf.cipher) {
208 	case WLAN_CIPHER_SUITE_WEP40:
209 	case WLAN_CIPHER_SUITE_WEP104:
210 	case WLAN_CIPHER_SUITE_TKIP:
211 	case WLAN_CIPHER_SUITE_CCMP:
212 	case WLAN_CIPHER_SUITE_CCMP_256:
213 	case WLAN_CIPHER_SUITE_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 	case WLAN_CIPHER_SUITE_GCMP:
218 	case WLAN_CIPHER_SUITE_GCMP_256:
219 		/* all of these we can do in software - if driver can */
220 		if (ret == 1)
221 			return 0;
222 		if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL))
223 			return -EINVAL;
224 		return 0;
225 	default:
226 		return -EINVAL;
227 	}
228 }
229 
ieee80211_key_disable_hw_accel(struct ieee80211_key * key)230 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
231 {
232 	struct ieee80211_sub_if_data *sdata;
233 	struct sta_info *sta;
234 	int ret;
235 
236 	might_sleep();
237 
238 	if (!key || !key->local->ops->set_key)
239 		return;
240 
241 	assert_key_lock(key->local);
242 
243 	if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
244 		return;
245 
246 	sta = key->sta;
247 	sdata = key->sdata;
248 
249 	if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
250 				 IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
251 				 IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
252 		increment_tailroom_need_count(sdata);
253 
254 	key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
255 	ret = drv_set_key(key->local, DISABLE_KEY, sdata,
256 			  sta ? &sta->sta : NULL, &key->conf);
257 
258 	if (ret)
259 		sdata_err(sdata,
260 			  "failed to remove key (%d, %pM) from hardware (%d)\n",
261 			  key->conf.keyidx,
262 			  sta ? sta->sta.addr : bcast_addr, ret);
263 }
264 
ieee80211_set_tx_key(struct ieee80211_key * key)265 int ieee80211_set_tx_key(struct ieee80211_key *key)
266 {
267 	struct sta_info *sta = key->sta;
268 	struct ieee80211_local *local = key->local;
269 
270 	assert_key_lock(local);
271 
272 	sta->ptk_idx = key->conf.keyidx;
273 
274 	if (!ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT))
275 		clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
276 	ieee80211_check_fast_xmit(sta);
277 
278 	return 0;
279 }
280 
ieee80211_pairwise_rekey(struct ieee80211_key * old,struct ieee80211_key * new)281 static void ieee80211_pairwise_rekey(struct ieee80211_key *old,
282 				     struct ieee80211_key *new)
283 {
284 	struct ieee80211_local *local = new->local;
285 	struct sta_info *sta = new->sta;
286 	int i;
287 
288 	assert_key_lock(local);
289 
290 	if (new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX) {
291 		/* Extended Key ID key install, initial one or rekey */
292 
293 		if (sta->ptk_idx != INVALID_PTK_KEYIDX &&
294 		    !ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT)) {
295 			/* Aggregation Sessions with Extended Key ID must not
296 			 * mix MPDUs with different keyIDs within one A-MPDU.
297 			 * Tear down running Tx aggregation sessions and block
298 			 * new Rx/Tx aggregation requests during rekey to
299 			 * ensure there are no A-MPDUs when the driver is not
300 			 * supporting A-MPDU key borders. (Blocking Tx only
301 			 * would be sufficient but WLAN_STA_BLOCK_BA gets the
302 			 * job done for the few ms we need it.)
303 			 */
304 			set_sta_flag(sta, WLAN_STA_BLOCK_BA);
305 			mutex_lock(&sta->ampdu_mlme.mtx);
306 			for (i = 0; i <  IEEE80211_NUM_TIDS; i++)
307 				___ieee80211_stop_tx_ba_session(sta, i,
308 								AGG_STOP_LOCAL_REQUEST);
309 			mutex_unlock(&sta->ampdu_mlme.mtx);
310 		}
311 	} else if (old) {
312 		/* Rekey without Extended Key ID.
313 		 * Aggregation sessions are OK when running on SW crypto.
314 		 * A broken remote STA may cause issues not observed with HW
315 		 * crypto, though.
316 		 */
317 		if (!(old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
318 			return;
319 
320 		/* Stop Tx till we are on the new key */
321 		old->flags |= KEY_FLAG_TAINTED;
322 		ieee80211_clear_fast_xmit(sta);
323 		if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
324 			set_sta_flag(sta, WLAN_STA_BLOCK_BA);
325 			ieee80211_sta_tear_down_BA_sessions(sta,
326 							    AGG_STOP_LOCAL_REQUEST);
327 		}
328 		if (!wiphy_ext_feature_isset(local->hw.wiphy,
329 					     NL80211_EXT_FEATURE_CAN_REPLACE_PTK0)) {
330 			pr_warn_ratelimited("Rekeying PTK for STA %pM but driver can't safely do that.",
331 					    sta->sta.addr);
332 			/* Flushing the driver queues *may* help prevent
333 			 * the clear text leaks and freezes.
334 			 */
335 			ieee80211_flush_queues(local, old->sdata, false);
336 		}
337 	}
338 }
339 
__ieee80211_set_default_key(struct ieee80211_sub_if_data * sdata,int idx,bool uni,bool multi)340 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
341 					int idx, bool uni, bool multi)
342 {
343 	struct ieee80211_key *key = NULL;
344 
345 	assert_key_lock(sdata->local);
346 
347 	if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
348 		key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
349 
350 	if (uni) {
351 		rcu_assign_pointer(sdata->default_unicast_key, key);
352 		ieee80211_check_fast_xmit_iface(sdata);
353 		if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
354 			drv_set_default_unicast_key(sdata->local, sdata, idx);
355 	}
356 
357 	if (multi)
358 		rcu_assign_pointer(sdata->default_multicast_key, key);
359 
360 	ieee80211_debugfs_key_update_default(sdata);
361 }
362 
ieee80211_set_default_key(struct ieee80211_sub_if_data * sdata,int idx,bool uni,bool multi)363 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
364 			       bool uni, bool multi)
365 {
366 	mutex_lock(&sdata->local->key_mtx);
367 	__ieee80211_set_default_key(sdata, idx, uni, multi);
368 	mutex_unlock(&sdata->local->key_mtx);
369 }
370 
371 static void
__ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data * sdata,int idx)372 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
373 {
374 	struct ieee80211_key *key = NULL;
375 
376 	assert_key_lock(sdata->local);
377 
378 	if (idx >= NUM_DEFAULT_KEYS &&
379 	    idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
380 		key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
381 
382 	rcu_assign_pointer(sdata->default_mgmt_key, key);
383 
384 	ieee80211_debugfs_key_update_default(sdata);
385 }
386 
ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data * sdata,int idx)387 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
388 				    int idx)
389 {
390 	mutex_lock(&sdata->local->key_mtx);
391 	__ieee80211_set_default_mgmt_key(sdata, idx);
392 	mutex_unlock(&sdata->local->key_mtx);
393 }
394 
ieee80211_key_replace(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,bool pairwise,struct ieee80211_key * old,struct ieee80211_key * new)395 static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
396 				  struct sta_info *sta,
397 				  bool pairwise,
398 				  struct ieee80211_key *old,
399 				  struct ieee80211_key *new)
400 {
401 	int idx;
402 	int ret = 0;
403 	bool defunikey, defmultikey, defmgmtkey;
404 
405 	/* caller must provide at least one old/new */
406 	if (WARN_ON(!new && !old))
407 		return 0;
408 
409 	if (new)
410 		list_add_tail_rcu(&new->list, &sdata->key_list);
411 
412 	WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
413 
414 	if (new && sta && pairwise) {
415 		/* Unicast rekey needs special handling. With Extended Key ID
416 		 * old is still NULL for the first rekey.
417 		 */
418 		ieee80211_pairwise_rekey(old, new);
419 	}
420 
421 	if (old) {
422 		idx = old->conf.keyidx;
423 
424 		if (old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
425 			ieee80211_key_disable_hw_accel(old);
426 
427 			if (new)
428 				ret = ieee80211_key_enable_hw_accel(new);
429 		}
430 	} else {
431 		/* new must be provided in case old is not */
432 		idx = new->conf.keyidx;
433 		if (!new->local->wowlan)
434 			ret = ieee80211_key_enable_hw_accel(new);
435 	}
436 
437 	if (ret)
438 		return ret;
439 
440 	if (sta) {
441 		if (pairwise) {
442 			rcu_assign_pointer(sta->ptk[idx], new);
443 			if (new &&
444 			    !(new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX)) {
445 				sta->ptk_idx = idx;
446 				clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
447 				ieee80211_check_fast_xmit(sta);
448 			}
449 		} else {
450 			rcu_assign_pointer(sta->gtk[idx], new);
451 		}
452 		/* Only needed for transition from no key -> key.
453 		 * Still triggers unnecessary when using Extended Key ID
454 		 * and installing the second key ID the first time.
455 		 */
456 		if (new && !old)
457 			ieee80211_check_fast_rx(sta);
458 	} else {
459 		defunikey = old &&
460 			old == key_mtx_dereference(sdata->local,
461 						sdata->default_unicast_key);
462 		defmultikey = old &&
463 			old == key_mtx_dereference(sdata->local,
464 						sdata->default_multicast_key);
465 		defmgmtkey = old &&
466 			old == key_mtx_dereference(sdata->local,
467 						sdata->default_mgmt_key);
468 
469 		if (defunikey && !new)
470 			__ieee80211_set_default_key(sdata, -1, true, false);
471 		if (defmultikey && !new)
472 			__ieee80211_set_default_key(sdata, -1, false, true);
473 		if (defmgmtkey && !new)
474 			__ieee80211_set_default_mgmt_key(sdata, -1);
475 
476 		rcu_assign_pointer(sdata->keys[idx], new);
477 		if (defunikey && new)
478 			__ieee80211_set_default_key(sdata, new->conf.keyidx,
479 						    true, false);
480 		if (defmultikey && new)
481 			__ieee80211_set_default_key(sdata, new->conf.keyidx,
482 						    false, true);
483 		if (defmgmtkey && new)
484 			__ieee80211_set_default_mgmt_key(sdata,
485 							 new->conf.keyidx);
486 	}
487 
488 	if (old)
489 		list_del_rcu(&old->list);
490 
491 	return 0;
492 }
493 
494 struct ieee80211_key *
ieee80211_key_alloc(u32 cipher,int idx,size_t key_len,const u8 * key_data,size_t seq_len,const u8 * seq,const struct ieee80211_cipher_scheme * cs)495 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
496 		    const u8 *key_data,
497 		    size_t seq_len, const u8 *seq,
498 		    const struct ieee80211_cipher_scheme *cs)
499 {
500 	struct ieee80211_key *key;
501 	int i, j, err;
502 
503 	if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS))
504 		return ERR_PTR(-EINVAL);
505 
506 	key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
507 	if (!key)
508 		return ERR_PTR(-ENOMEM);
509 
510 	/*
511 	 * Default to software encryption; we'll later upload the
512 	 * key to the hardware if possible.
513 	 */
514 	key->conf.flags = 0;
515 	key->flags = 0;
516 
517 	key->conf.cipher = cipher;
518 	key->conf.keyidx = idx;
519 	key->conf.keylen = key_len;
520 	switch (cipher) {
521 	case WLAN_CIPHER_SUITE_WEP40:
522 	case WLAN_CIPHER_SUITE_WEP104:
523 		key->conf.iv_len = IEEE80211_WEP_IV_LEN;
524 		key->conf.icv_len = IEEE80211_WEP_ICV_LEN;
525 		break;
526 	case WLAN_CIPHER_SUITE_TKIP:
527 		key->conf.iv_len = IEEE80211_TKIP_IV_LEN;
528 		key->conf.icv_len = IEEE80211_TKIP_ICV_LEN;
529 		if (seq) {
530 			for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
531 				key->u.tkip.rx[i].iv32 =
532 					get_unaligned_le32(&seq[2]);
533 				key->u.tkip.rx[i].iv16 =
534 					get_unaligned_le16(seq);
535 			}
536 		}
537 		spin_lock_init(&key->u.tkip.txlock);
538 		break;
539 	case WLAN_CIPHER_SUITE_CCMP:
540 		key->conf.iv_len = IEEE80211_CCMP_HDR_LEN;
541 		key->conf.icv_len = IEEE80211_CCMP_MIC_LEN;
542 		if (seq) {
543 			for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
544 				for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++)
545 					key->u.ccmp.rx_pn[i][j] =
546 						seq[IEEE80211_CCMP_PN_LEN - j - 1];
547 		}
548 		/*
549 		 * Initialize AES key state here as an optimization so that
550 		 * it does not need to be initialized for every packet.
551 		 */
552 		key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
553 			key_data, key_len, IEEE80211_CCMP_MIC_LEN);
554 		if (IS_ERR(key->u.ccmp.tfm)) {
555 			err = PTR_ERR(key->u.ccmp.tfm);
556 			kfree(key);
557 			return ERR_PTR(err);
558 		}
559 		break;
560 	case WLAN_CIPHER_SUITE_CCMP_256:
561 		key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN;
562 		key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN;
563 		for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
564 			for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++)
565 				key->u.ccmp.rx_pn[i][j] =
566 					seq[IEEE80211_CCMP_256_PN_LEN - j - 1];
567 		/* Initialize AES key state here as an optimization so that
568 		 * it does not need to be initialized for every packet.
569 		 */
570 		key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
571 			key_data, key_len, IEEE80211_CCMP_256_MIC_LEN);
572 		if (IS_ERR(key->u.ccmp.tfm)) {
573 			err = PTR_ERR(key->u.ccmp.tfm);
574 			kfree(key);
575 			return ERR_PTR(err);
576 		}
577 		break;
578 	case WLAN_CIPHER_SUITE_AES_CMAC:
579 	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
580 		key->conf.iv_len = 0;
581 		if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
582 			key->conf.icv_len = sizeof(struct ieee80211_mmie);
583 		else
584 			key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
585 		if (seq)
586 			for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
587 				key->u.aes_cmac.rx_pn[j] =
588 					seq[IEEE80211_CMAC_PN_LEN - j - 1];
589 		/*
590 		 * Initialize AES key state here as an optimization so that
591 		 * it does not need to be initialized for every packet.
592 		 */
593 		key->u.aes_cmac.tfm =
594 			ieee80211_aes_cmac_key_setup(key_data, key_len);
595 		if (IS_ERR(key->u.aes_cmac.tfm)) {
596 			err = PTR_ERR(key->u.aes_cmac.tfm);
597 			kfree(key);
598 			return ERR_PTR(err);
599 		}
600 		break;
601 	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
602 	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
603 		key->conf.iv_len = 0;
604 		key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
605 		if (seq)
606 			for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++)
607 				key->u.aes_gmac.rx_pn[j] =
608 					seq[IEEE80211_GMAC_PN_LEN - j - 1];
609 		/* Initialize AES key state here as an optimization so that
610 		 * it does not need to be initialized for every packet.
611 		 */
612 		key->u.aes_gmac.tfm =
613 			ieee80211_aes_gmac_key_setup(key_data, key_len);
614 		if (IS_ERR(key->u.aes_gmac.tfm)) {
615 			err = PTR_ERR(key->u.aes_gmac.tfm);
616 			kfree(key);
617 			return ERR_PTR(err);
618 		}
619 		break;
620 	case WLAN_CIPHER_SUITE_GCMP:
621 	case WLAN_CIPHER_SUITE_GCMP_256:
622 		key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
623 		key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
624 		for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
625 			for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
626 				key->u.gcmp.rx_pn[i][j] =
627 					seq[IEEE80211_GCMP_PN_LEN - j - 1];
628 		/* Initialize AES key state here as an optimization so that
629 		 * it does not need to be initialized for every packet.
630 		 */
631 		key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
632 								      key_len);
633 		if (IS_ERR(key->u.gcmp.tfm)) {
634 			err = PTR_ERR(key->u.gcmp.tfm);
635 			kfree(key);
636 			return ERR_PTR(err);
637 		}
638 		break;
639 	default:
640 		if (cs) {
641 			if (seq_len && seq_len != cs->pn_len) {
642 				kfree(key);
643 				return ERR_PTR(-EINVAL);
644 			}
645 
646 			key->conf.iv_len = cs->hdr_len;
647 			key->conf.icv_len = cs->mic_len;
648 			for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
649 				for (j = 0; j < seq_len; j++)
650 					key->u.gen.rx_pn[i][j] =
651 							seq[seq_len - j - 1];
652 			key->flags |= KEY_FLAG_CIPHER_SCHEME;
653 		}
654 	}
655 	memcpy(key->conf.key, key_data, key_len);
656 	INIT_LIST_HEAD(&key->list);
657 
658 	return key;
659 }
660 
ieee80211_key_free_common(struct ieee80211_key * key)661 static void ieee80211_key_free_common(struct ieee80211_key *key)
662 {
663 	switch (key->conf.cipher) {
664 	case WLAN_CIPHER_SUITE_CCMP:
665 	case WLAN_CIPHER_SUITE_CCMP_256:
666 		ieee80211_aes_key_free(key->u.ccmp.tfm);
667 		break;
668 	case WLAN_CIPHER_SUITE_AES_CMAC:
669 	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
670 		ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
671 		break;
672 	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
673 	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
674 		ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm);
675 		break;
676 	case WLAN_CIPHER_SUITE_GCMP:
677 	case WLAN_CIPHER_SUITE_GCMP_256:
678 		ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
679 		break;
680 	}
681 	kzfree(key);
682 }
683 
__ieee80211_key_destroy(struct ieee80211_key * key,bool delay_tailroom)684 static void __ieee80211_key_destroy(struct ieee80211_key *key,
685 				    bool delay_tailroom)
686 {
687 	if (key->local) {
688 		struct ieee80211_sub_if_data *sdata = key->sdata;
689 
690 		ieee80211_debugfs_key_remove(key);
691 
692 		if (delay_tailroom) {
693 			/* see ieee80211_delayed_tailroom_dec */
694 			sdata->crypto_tx_tailroom_pending_dec++;
695 			schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
696 					      HZ/2);
697 		} else {
698 			decrease_tailroom_need_count(sdata, 1);
699 		}
700 	}
701 
702 	ieee80211_key_free_common(key);
703 }
704 
ieee80211_key_destroy(struct ieee80211_key * key,bool delay_tailroom)705 static void ieee80211_key_destroy(struct ieee80211_key *key,
706 				  bool delay_tailroom)
707 {
708 	if (!key)
709 		return;
710 
711 	/*
712 	 * Synchronize so the TX path and rcu key iterators
713 	 * can no longer be using this key before we free/remove it.
714 	 */
715 	synchronize_net();
716 
717 	__ieee80211_key_destroy(key, delay_tailroom);
718 }
719 
ieee80211_key_free_unused(struct ieee80211_key * key)720 void ieee80211_key_free_unused(struct ieee80211_key *key)
721 {
722 	WARN_ON(key->sdata || key->local);
723 	ieee80211_key_free_common(key);
724 }
725 
ieee80211_key_identical(struct ieee80211_sub_if_data * sdata,struct ieee80211_key * old,struct ieee80211_key * new)726 static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata,
727 				    struct ieee80211_key *old,
728 				    struct ieee80211_key *new)
729 {
730 	u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP];
731 	u8 *tk_old, *tk_new;
732 
733 	if (!old || new->conf.keylen != old->conf.keylen)
734 		return false;
735 
736 	tk_old = old->conf.key;
737 	tk_new = new->conf.key;
738 
739 	/*
740 	 * In station mode, don't compare the TX MIC key, as it's never used
741 	 * and offloaded rekeying may not care to send it to the host. This
742 	 * is the case in iwlwifi, for example.
743 	 */
744 	if (sdata->vif.type == NL80211_IFTYPE_STATION &&
745 	    new->conf.cipher == WLAN_CIPHER_SUITE_TKIP &&
746 	    new->conf.keylen == WLAN_KEY_LEN_TKIP &&
747 	    !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
748 		memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP);
749 		memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP);
750 		memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
751 		memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
752 		tk_old = tkip_old;
753 		tk_new = tkip_new;
754 	}
755 
756 	return !crypto_memneq(tk_old, tk_new, new->conf.keylen);
757 }
758 
ieee80211_key_link(struct ieee80211_key * key,struct ieee80211_sub_if_data * sdata,struct sta_info * sta)759 int ieee80211_key_link(struct ieee80211_key *key,
760 		       struct ieee80211_sub_if_data *sdata,
761 		       struct sta_info *sta)
762 {
763 	struct ieee80211_key *old_key;
764 	int idx = key->conf.keyidx;
765 	bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
766 	/*
767 	 * We want to delay tailroom updates only for station - in that
768 	 * case it helps roaming speed, but in other cases it hurts and
769 	 * can cause warnings to appear.
770 	 */
771 	bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION;
772 	int ret = -EOPNOTSUPP;
773 
774 	mutex_lock(&sdata->local->key_mtx);
775 
776 	if (sta && pairwise) {
777 		struct ieee80211_key *alt_key;
778 
779 		old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
780 		alt_key = key_mtx_dereference(sdata->local, sta->ptk[idx ^ 1]);
781 
782 		/* The rekey code assumes that the old and new key are using
783 		 * the same cipher. Enforce the assumption for pairwise keys.
784 		 */
785 		if ((alt_key && alt_key->conf.cipher != key->conf.cipher) ||
786 		    (old_key && old_key->conf.cipher != key->conf.cipher))
787 			goto out;
788 	} else if (sta) {
789 		old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
790 	} else {
791 		old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
792 	}
793 
794 	/* Non-pairwise keys must also not switch the cipher on rekey */
795 	if (!pairwise) {
796 		if (old_key && old_key->conf.cipher != key->conf.cipher)
797 			goto out;
798 	}
799 
800 	/*
801 	 * Silently accept key re-installation without really installing the
802 	 * new version of the key to avoid nonce reuse or replay issues.
803 	 */
804 	if (ieee80211_key_identical(sdata, old_key, key)) {
805 		ieee80211_key_free_unused(key);
806 		ret = 0;
807 		goto out;
808 	}
809 
810 	key->local = sdata->local;
811 	key->sdata = sdata;
812 	key->sta = sta;
813 
814 	increment_tailroom_need_count(sdata);
815 
816 	ret = ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
817 
818 	if (!ret) {
819 		ieee80211_debugfs_key_add(key);
820 		ieee80211_key_destroy(old_key, delay_tailroom);
821 	} else {
822 		ieee80211_key_free(key, delay_tailroom);
823 	}
824 
825  out:
826 	mutex_unlock(&sdata->local->key_mtx);
827 
828 	return ret;
829 }
830 
ieee80211_key_free(struct ieee80211_key * key,bool delay_tailroom)831 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
832 {
833 	if (!key)
834 		return;
835 
836 	/*
837 	 * Replace key with nothingness if it was ever used.
838 	 */
839 	if (key->sdata)
840 		ieee80211_key_replace(key->sdata, key->sta,
841 				key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
842 				key, NULL);
843 	ieee80211_key_destroy(key, delay_tailroom);
844 }
845 
ieee80211_reenable_keys(struct ieee80211_sub_if_data * sdata)846 void ieee80211_reenable_keys(struct ieee80211_sub_if_data *sdata)
847 {
848 	struct ieee80211_key *key;
849 	struct ieee80211_sub_if_data *vlan;
850 
851 	ASSERT_RTNL();
852 
853 	mutex_lock(&sdata->local->key_mtx);
854 
855 	sdata->crypto_tx_tailroom_needed_cnt = 0;
856 	sdata->crypto_tx_tailroom_pending_dec = 0;
857 
858 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
859 		list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
860 			vlan->crypto_tx_tailroom_needed_cnt = 0;
861 			vlan->crypto_tx_tailroom_pending_dec = 0;
862 		}
863 	}
864 
865 	if (ieee80211_sdata_running(sdata)) {
866 		list_for_each_entry(key, &sdata->key_list, list) {
867 			increment_tailroom_need_count(sdata);
868 			ieee80211_key_enable_hw_accel(key);
869 		}
870 	}
871 
872 	mutex_unlock(&sdata->local->key_mtx);
873 }
874 
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)875 void ieee80211_iter_keys(struct ieee80211_hw *hw,
876 			 struct ieee80211_vif *vif,
877 			 void (*iter)(struct ieee80211_hw *hw,
878 				      struct ieee80211_vif *vif,
879 				      struct ieee80211_sta *sta,
880 				      struct ieee80211_key_conf *key,
881 				      void *data),
882 			 void *iter_data)
883 {
884 	struct ieee80211_local *local = hw_to_local(hw);
885 	struct ieee80211_key *key, *tmp;
886 	struct ieee80211_sub_if_data *sdata;
887 
888 	ASSERT_RTNL();
889 
890 	mutex_lock(&local->key_mtx);
891 	if (vif) {
892 		sdata = vif_to_sdata(vif);
893 		list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
894 			iter(hw, &sdata->vif,
895 			     key->sta ? &key->sta->sta : NULL,
896 			     &key->conf, iter_data);
897 	} else {
898 		list_for_each_entry(sdata, &local->interfaces, list)
899 			list_for_each_entry_safe(key, tmp,
900 						 &sdata->key_list, list)
901 				iter(hw, &sdata->vif,
902 				     key->sta ? &key->sta->sta : NULL,
903 				     &key->conf, iter_data);
904 	}
905 	mutex_unlock(&local->key_mtx);
906 }
907 EXPORT_SYMBOL(ieee80211_iter_keys);
908 
909 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)910 _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
911 			 struct ieee80211_sub_if_data *sdata,
912 			 void (*iter)(struct ieee80211_hw *hw,
913 				      struct ieee80211_vif *vif,
914 				      struct ieee80211_sta *sta,
915 				      struct ieee80211_key_conf *key,
916 				      void *data),
917 			 void *iter_data)
918 {
919 	struct ieee80211_key *key;
920 
921 	list_for_each_entry_rcu(key, &sdata->key_list, list) {
922 		/* skip keys of station in removal process */
923 		if (key->sta && key->sta->removed)
924 			continue;
925 		if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
926 			continue;
927 
928 		iter(hw, &sdata->vif,
929 		     key->sta ? &key->sta->sta : NULL,
930 		     &key->conf, iter_data);
931 	}
932 }
933 
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)934 void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
935 			     struct ieee80211_vif *vif,
936 			     void (*iter)(struct ieee80211_hw *hw,
937 					  struct ieee80211_vif *vif,
938 					  struct ieee80211_sta *sta,
939 					  struct ieee80211_key_conf *key,
940 					  void *data),
941 			     void *iter_data)
942 {
943 	struct ieee80211_local *local = hw_to_local(hw);
944 	struct ieee80211_sub_if_data *sdata;
945 
946 	if (vif) {
947 		sdata = vif_to_sdata(vif);
948 		_ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
949 	} else {
950 		list_for_each_entry_rcu(sdata, &local->interfaces, list)
951 			_ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
952 	}
953 }
954 EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
955 
ieee80211_free_keys_iface(struct ieee80211_sub_if_data * sdata,struct list_head * keys)956 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
957 				      struct list_head *keys)
958 {
959 	struct ieee80211_key *key, *tmp;
960 
961 	decrease_tailroom_need_count(sdata,
962 				     sdata->crypto_tx_tailroom_pending_dec);
963 	sdata->crypto_tx_tailroom_pending_dec = 0;
964 
965 	ieee80211_debugfs_key_remove_mgmt_default(sdata);
966 
967 	list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
968 		ieee80211_key_replace(key->sdata, key->sta,
969 				key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
970 				key, NULL);
971 		list_add_tail(&key->list, keys);
972 	}
973 
974 	ieee80211_debugfs_key_update_default(sdata);
975 }
976 
ieee80211_free_keys(struct ieee80211_sub_if_data * sdata,bool force_synchronize)977 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
978 			 bool force_synchronize)
979 {
980 	struct ieee80211_local *local = sdata->local;
981 	struct ieee80211_sub_if_data *vlan;
982 	struct ieee80211_sub_if_data *master;
983 	struct ieee80211_key *key, *tmp;
984 	LIST_HEAD(keys);
985 
986 	cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
987 
988 	mutex_lock(&local->key_mtx);
989 
990 	ieee80211_free_keys_iface(sdata, &keys);
991 
992 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
993 		list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
994 			ieee80211_free_keys_iface(vlan, &keys);
995 	}
996 
997 	if (!list_empty(&keys) || force_synchronize)
998 		synchronize_net();
999 	list_for_each_entry_safe(key, tmp, &keys, list)
1000 		__ieee80211_key_destroy(key, false);
1001 
1002 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1003 		if (sdata->bss) {
1004 			master = container_of(sdata->bss,
1005 					      struct ieee80211_sub_if_data,
1006 					      u.ap);
1007 
1008 			WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
1009 				     master->crypto_tx_tailroom_needed_cnt);
1010 		}
1011 	} else {
1012 		WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
1013 			     sdata->crypto_tx_tailroom_pending_dec);
1014 	}
1015 
1016 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
1017 		list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1018 			WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
1019 				     vlan->crypto_tx_tailroom_pending_dec);
1020 	}
1021 
1022 	mutex_unlock(&local->key_mtx);
1023 }
1024 
ieee80211_free_sta_keys(struct ieee80211_local * local,struct sta_info * sta)1025 void ieee80211_free_sta_keys(struct ieee80211_local *local,
1026 			     struct sta_info *sta)
1027 {
1028 	struct ieee80211_key *key;
1029 	int i;
1030 
1031 	mutex_lock(&local->key_mtx);
1032 	for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) {
1033 		key = key_mtx_dereference(local, sta->gtk[i]);
1034 		if (!key)
1035 			continue;
1036 		ieee80211_key_replace(key->sdata, key->sta,
1037 				key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1038 				key, NULL);
1039 		__ieee80211_key_destroy(key, key->sdata->vif.type ==
1040 					NL80211_IFTYPE_STATION);
1041 	}
1042 
1043 	for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1044 		key = key_mtx_dereference(local, sta->ptk[i]);
1045 		if (!key)
1046 			continue;
1047 		ieee80211_key_replace(key->sdata, key->sta,
1048 				key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
1049 				key, NULL);
1050 		__ieee80211_key_destroy(key, key->sdata->vif.type ==
1051 					NL80211_IFTYPE_STATION);
1052 	}
1053 
1054 	mutex_unlock(&local->key_mtx);
1055 }
1056 
ieee80211_delayed_tailroom_dec(struct work_struct * wk)1057 void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
1058 {
1059 	struct ieee80211_sub_if_data *sdata;
1060 
1061 	sdata = container_of(wk, struct ieee80211_sub_if_data,
1062 			     dec_tailroom_needed_wk.work);
1063 
1064 	/*
1065 	 * The reason for the delayed tailroom needed decrementing is to
1066 	 * make roaming faster: during roaming, all keys are first deleted
1067 	 * and then new keys are installed. The first new key causes the
1068 	 * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
1069 	 * the cost of synchronize_net() (which can be slow). Avoid this
1070 	 * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
1071 	 * key removal for a while, so if we roam the value is larger than
1072 	 * zero and no 0->1 transition happens.
1073 	 *
1074 	 * The cost is that if the AP switching was from an AP with keys
1075 	 * to one without, we still allocate tailroom while it would no
1076 	 * longer be needed. However, in the typical (fast) roaming case
1077 	 * within an ESS this usually won't happen.
1078 	 */
1079 
1080 	mutex_lock(&sdata->local->key_mtx);
1081 	decrease_tailroom_need_count(sdata,
1082 				     sdata->crypto_tx_tailroom_pending_dec);
1083 	sdata->crypto_tx_tailroom_pending_dec = 0;
1084 	mutex_unlock(&sdata->local->key_mtx);
1085 }
1086 
ieee80211_gtk_rekey_notify(struct ieee80211_vif * vif,const u8 * bssid,const u8 * replay_ctr,gfp_t gfp)1087 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
1088 				const u8 *replay_ctr, gfp_t gfp)
1089 {
1090 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1091 
1092 	trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
1093 
1094 	cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
1095 }
1096 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
1097 
ieee80211_get_key_rx_seq(struct ieee80211_key_conf * keyconf,int tid,struct ieee80211_key_seq * seq)1098 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
1099 			      int tid, struct ieee80211_key_seq *seq)
1100 {
1101 	struct ieee80211_key *key;
1102 	const u8 *pn;
1103 
1104 	key = container_of(keyconf, struct ieee80211_key, conf);
1105 
1106 	switch (key->conf.cipher) {
1107 	case WLAN_CIPHER_SUITE_TKIP:
1108 		if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1109 			return;
1110 		seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
1111 		seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
1112 		break;
1113 	case WLAN_CIPHER_SUITE_CCMP:
1114 	case WLAN_CIPHER_SUITE_CCMP_256:
1115 		if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1116 			return;
1117 		if (tid < 0)
1118 			pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1119 		else
1120 			pn = key->u.ccmp.rx_pn[tid];
1121 		memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
1122 		break;
1123 	case WLAN_CIPHER_SUITE_AES_CMAC:
1124 	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1125 		if (WARN_ON(tid != 0))
1126 			return;
1127 		pn = key->u.aes_cmac.rx_pn;
1128 		memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
1129 		break;
1130 	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1131 	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1132 		if (WARN_ON(tid != 0))
1133 			return;
1134 		pn = key->u.aes_gmac.rx_pn;
1135 		memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
1136 		break;
1137 	case WLAN_CIPHER_SUITE_GCMP:
1138 	case WLAN_CIPHER_SUITE_GCMP_256:
1139 		if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1140 			return;
1141 		if (tid < 0)
1142 			pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1143 		else
1144 			pn = key->u.gcmp.rx_pn[tid];
1145 		memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
1146 		break;
1147 	}
1148 }
1149 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
1150 
ieee80211_set_key_rx_seq(struct ieee80211_key_conf * keyconf,int tid,struct ieee80211_key_seq * seq)1151 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1152 			      int tid, struct ieee80211_key_seq *seq)
1153 {
1154 	struct ieee80211_key *key;
1155 	u8 *pn;
1156 
1157 	key = container_of(keyconf, struct ieee80211_key, conf);
1158 
1159 	switch (key->conf.cipher) {
1160 	case WLAN_CIPHER_SUITE_TKIP:
1161 		if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1162 			return;
1163 		key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1164 		key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1165 		break;
1166 	case WLAN_CIPHER_SUITE_CCMP:
1167 	case WLAN_CIPHER_SUITE_CCMP_256:
1168 		if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1169 			return;
1170 		if (tid < 0)
1171 			pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1172 		else
1173 			pn = key->u.ccmp.rx_pn[tid];
1174 		memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1175 		break;
1176 	case WLAN_CIPHER_SUITE_AES_CMAC:
1177 	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1178 		if (WARN_ON(tid != 0))
1179 			return;
1180 		pn = key->u.aes_cmac.rx_pn;
1181 		memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1182 		break;
1183 	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1184 	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1185 		if (WARN_ON(tid != 0))
1186 			return;
1187 		pn = key->u.aes_gmac.rx_pn;
1188 		memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1189 		break;
1190 	case WLAN_CIPHER_SUITE_GCMP:
1191 	case WLAN_CIPHER_SUITE_GCMP_256:
1192 		if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1193 			return;
1194 		if (tid < 0)
1195 			pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1196 		else
1197 			pn = key->u.gcmp.rx_pn[tid];
1198 		memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1199 		break;
1200 	default:
1201 		WARN_ON(1);
1202 		break;
1203 	}
1204 }
1205 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1206 
ieee80211_remove_key(struct ieee80211_key_conf * keyconf)1207 void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1208 {
1209 	struct ieee80211_key *key;
1210 
1211 	key = container_of(keyconf, struct ieee80211_key, conf);
1212 
1213 	assert_key_lock(key->local);
1214 
1215 	/*
1216 	 * if key was uploaded, we assume the driver will/has remove(d)
1217 	 * it, so adjust bookkeeping accordingly
1218 	 */
1219 	if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1220 		key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1221 
1222 		if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
1223 					 IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
1224 					 IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
1225 			increment_tailroom_need_count(key->sdata);
1226 	}
1227 
1228 	ieee80211_key_free(key, false);
1229 }
1230 EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1231 
1232 struct ieee80211_key_conf *
ieee80211_gtk_rekey_add(struct ieee80211_vif * vif,struct ieee80211_key_conf * keyconf)1233 ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1234 			struct ieee80211_key_conf *keyconf)
1235 {
1236 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1237 	struct ieee80211_local *local = sdata->local;
1238 	struct ieee80211_key *key;
1239 	int err;
1240 
1241 	if (WARN_ON(!local->wowlan))
1242 		return ERR_PTR(-EINVAL);
1243 
1244 	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1245 		return ERR_PTR(-EINVAL);
1246 
1247 	key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1248 				  keyconf->keylen, keyconf->key,
1249 				  0, NULL, NULL);
1250 	if (IS_ERR(key))
1251 		return ERR_CAST(key);
1252 
1253 	if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1254 		key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1255 
1256 	err = ieee80211_key_link(key, sdata, NULL);
1257 	if (err)
1258 		return ERR_PTR(err);
1259 
1260 	return &key->conf;
1261 }
1262 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);
1263