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1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. |
3 | * Copyright 2005-2006, Devicescape Software, Inc. |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> |
5 | * Copyright 2007-2008 Johannes Berg <johannes@sipsolutions.net> |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License version 2 as |
9 | * published by the Free Software Foundation. |
10 | */ |
11 | |
12 | #include <linux/if_ether.h> |
13 | #include <linux/etherdevice.h> |
14 | #include <linux/list.h> |
15 | #include <linux/rcupdate.h> |
16 | #include <linux/rtnetlink.h> |
17 | #include <linux/slab.h> |
18 | #include <linux/export.h> |
19 | #include <net/mac80211.h> |
20 | #include <asm/unaligned.h> |
21 | #include "ieee80211_i.h" |
22 | #include "driver-ops.h" |
23 | #include "debugfs_key.h" |
24 | #include "aes_ccm.h" |
25 | #include "aes_cmac.h" |
26 | |
27 | |
28 | /** |
29 | * DOC: Key handling basics |
30 | * |
31 | * Key handling in mac80211 is done based on per-interface (sub_if_data) |
32 | * keys and per-station keys. Since each station belongs to an interface, |
33 | * each station key also belongs to that interface. |
34 | * |
35 | * Hardware acceleration is done on a best-effort basis for algorithms |
36 | * that are implemented in software, for each key the hardware is asked |
37 | * to enable that key for offloading but if it cannot do that the key is |
38 | * simply kept for software encryption (unless it is for an algorithm |
39 | * that isn't implemented in software). |
40 | * There is currently no way of knowing whether a key is handled in SW |
41 | * or HW except by looking into debugfs. |
42 | * |
43 | * All key management is internally protected by a mutex. Within all |
44 | * other parts of mac80211, key references are, just as STA structure |
45 | * references, protected by RCU. Note, however, that some things are |
46 | * unprotected, namely the key->sta dereferences within the hardware |
47 | * acceleration functions. This means that sta_info_destroy() must |
48 | * remove the key which waits for an RCU grace period. |
49 | */ |
50 | |
51 | static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; |
52 | |
53 | static void assert_key_lock(struct ieee80211_local *local) |
54 | { |
55 | lockdep_assert_held(&local->key_mtx); |
56 | } |
57 | |
58 | static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata) |
59 | { |
60 | /* |
61 | * When this count is zero, SKB resizing for allocating tailroom |
62 | * for IV or MMIC is skipped. But, this check has created two race |
63 | * cases in xmit path while transiting from zero count to one: |
64 | * |
65 | * 1. SKB resize was skipped because no key was added but just before |
66 | * the xmit key is added and SW encryption kicks off. |
67 | * |
68 | * 2. SKB resize was skipped because all the keys were hw planted but |
69 | * just before xmit one of the key is deleted and SW encryption kicks |
70 | * off. |
71 | * |
72 | * In both the above case SW encryption will find not enough space for |
73 | * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c) |
74 | * |
75 | * Solution has been explained at |
76 | * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net |
77 | */ |
78 | |
79 | if (!sdata->crypto_tx_tailroom_needed_cnt++) { |
80 | /* |
81 | * Flush all XMIT packets currently using HW encryption or no |
82 | * encryption at all if the count transition is from 0 -> 1. |
83 | */ |
84 | synchronize_net(); |
85 | } |
86 | } |
87 | |
88 | static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key) |
89 | { |
90 | struct ieee80211_sub_if_data *sdata; |
91 | struct sta_info *sta; |
92 | int ret; |
93 | |
94 | might_sleep(); |
95 | |
96 | if (key->flags & KEY_FLAG_TAINTED) |
97 | return -EINVAL; |
98 | |
99 | if (!key->local->ops->set_key) |
100 | goto out_unsupported; |
101 | |
102 | assert_key_lock(key->local); |
103 | |
104 | sta = key->sta; |
105 | |
106 | /* |
107 | * If this is a per-STA GTK, check if it |
108 | * is supported; if not, return. |
109 | */ |
110 | if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) && |
111 | !(key->local->hw.flags & IEEE80211_HW_SUPPORTS_PER_STA_GTK)) |
112 | goto out_unsupported; |
113 | |
114 | if (sta && !sta->uploaded) |
115 | goto out_unsupported; |
116 | |
117 | sdata = key->sdata; |
118 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { |
119 | /* |
120 | * The driver doesn't know anything about VLAN interfaces. |
121 | * Hence, don't send GTKs for VLAN interfaces to the driver. |
122 | */ |
123 | if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) |
124 | goto out_unsupported; |
125 | } |
126 | |
127 | ret = drv_set_key(key->local, SET_KEY, sdata, |
128 | sta ? &sta->sta : NULL, &key->conf); |
129 | |
130 | if (!ret) { |
131 | key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; |
132 | |
133 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
134 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) || |
135 | (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))) |
136 | sdata->crypto_tx_tailroom_needed_cnt--; |
137 | |
138 | WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && |
139 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)); |
140 | |
141 | return 0; |
142 | } |
143 | |
144 | if (ret != -ENOSPC && ret != -EOPNOTSUPP) |
145 | sdata_err(sdata, |
146 | "failed to set key (%d, %pM) to hardware (%d)\n", |
147 | key->conf.keyidx, |
148 | sta ? sta->sta.addr : bcast_addr, ret); |
149 | |
150 | out_unsupported: |
151 | switch (key->conf.cipher) { |
152 | case WLAN_CIPHER_SUITE_WEP40: |
153 | case WLAN_CIPHER_SUITE_WEP104: |
154 | case WLAN_CIPHER_SUITE_TKIP: |
155 | case WLAN_CIPHER_SUITE_CCMP: |
156 | case WLAN_CIPHER_SUITE_AES_CMAC: |
157 | /* all of these we can do in software */ |
158 | return 0; |
159 | default: |
160 | return -EINVAL; |
161 | } |
162 | } |
163 | |
164 | static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key) |
165 | { |
166 | struct ieee80211_sub_if_data *sdata; |
167 | struct sta_info *sta; |
168 | int ret; |
169 | |
170 | might_sleep(); |
171 | |
172 | if (!key || !key->local->ops->set_key) |
173 | return; |
174 | |
175 | assert_key_lock(key->local); |
176 | |
177 | if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) |
178 | return; |
179 | |
180 | sta = key->sta; |
181 | sdata = key->sdata; |
182 | |
183 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
184 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) || |
185 | (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))) |
186 | increment_tailroom_need_count(sdata); |
187 | |
188 | ret = drv_set_key(key->local, DISABLE_KEY, sdata, |
189 | sta ? &sta->sta : NULL, &key->conf); |
190 | |
191 | if (ret) |
192 | sdata_err(sdata, |
193 | "failed to remove key (%d, %pM) from hardware (%d)\n", |
194 | key->conf.keyidx, |
195 | sta ? sta->sta.addr : bcast_addr, ret); |
196 | |
197 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; |
198 | } |
199 | |
200 | static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, |
201 | int idx, bool uni, bool multi) |
202 | { |
203 | struct ieee80211_key *key = NULL; |
204 | |
205 | assert_key_lock(sdata->local); |
206 | |
207 | if (idx >= 0 && idx < NUM_DEFAULT_KEYS) |
208 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
209 | |
210 | if (uni) { |
211 | rcu_assign_pointer(sdata->default_unicast_key, key); |
212 | drv_set_default_unicast_key(sdata->local, sdata, idx); |
213 | } |
214 | |
215 | if (multi) |
216 | rcu_assign_pointer(sdata->default_multicast_key, key); |
217 | |
218 | ieee80211_debugfs_key_update_default(sdata); |
219 | } |
220 | |
221 | void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx, |
222 | bool uni, bool multi) |
223 | { |
224 | mutex_lock(&sdata->local->key_mtx); |
225 | __ieee80211_set_default_key(sdata, idx, uni, multi); |
226 | mutex_unlock(&sdata->local->key_mtx); |
227 | } |
228 | |
229 | static void |
230 | __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx) |
231 | { |
232 | struct ieee80211_key *key = NULL; |
233 | |
234 | assert_key_lock(sdata->local); |
235 | |
236 | if (idx >= NUM_DEFAULT_KEYS && |
237 | idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) |
238 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
239 | |
240 | rcu_assign_pointer(sdata->default_mgmt_key, key); |
241 | |
242 | ieee80211_debugfs_key_update_default(sdata); |
243 | } |
244 | |
245 | void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, |
246 | int idx) |
247 | { |
248 | mutex_lock(&sdata->local->key_mtx); |
249 | __ieee80211_set_default_mgmt_key(sdata, idx); |
250 | mutex_unlock(&sdata->local->key_mtx); |
251 | } |
252 | |
253 | |
254 | static void ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, |
255 | struct sta_info *sta, |
256 | bool pairwise, |
257 | struct ieee80211_key *old, |
258 | struct ieee80211_key *new) |
259 | { |
260 | int idx; |
261 | bool defunikey, defmultikey, defmgmtkey; |
262 | |
263 | /* caller must provide at least one old/new */ |
264 | if (WARN_ON(!new && !old)) |
265 | return; |
266 | |
267 | if (new) |
268 | list_add_tail(&new->list, &sdata->key_list); |
269 | |
270 | WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx); |
271 | |
272 | if (old) |
273 | idx = old->conf.keyidx; |
274 | else |
275 | idx = new->conf.keyidx; |
276 | |
277 | if (sta) { |
278 | if (pairwise) { |
279 | rcu_assign_pointer(sta->ptk[idx], new); |
280 | sta->ptk_idx = idx; |
281 | } else { |
282 | rcu_assign_pointer(sta->gtk[idx], new); |
283 | sta->gtk_idx = idx; |
284 | } |
285 | } else { |
286 | defunikey = old && |
287 | old == key_mtx_dereference(sdata->local, |
288 | sdata->default_unicast_key); |
289 | defmultikey = old && |
290 | old == key_mtx_dereference(sdata->local, |
291 | sdata->default_multicast_key); |
292 | defmgmtkey = old && |
293 | old == key_mtx_dereference(sdata->local, |
294 | sdata->default_mgmt_key); |
295 | |
296 | if (defunikey && !new) |
297 | __ieee80211_set_default_key(sdata, -1, true, false); |
298 | if (defmultikey && !new) |
299 | __ieee80211_set_default_key(sdata, -1, false, true); |
300 | if (defmgmtkey && !new) |
301 | __ieee80211_set_default_mgmt_key(sdata, -1); |
302 | |
303 | rcu_assign_pointer(sdata->keys[idx], new); |
304 | if (defunikey && new) |
305 | __ieee80211_set_default_key(sdata, new->conf.keyidx, |
306 | true, false); |
307 | if (defmultikey && new) |
308 | __ieee80211_set_default_key(sdata, new->conf.keyidx, |
309 | false, true); |
310 | if (defmgmtkey && new) |
311 | __ieee80211_set_default_mgmt_key(sdata, |
312 | new->conf.keyidx); |
313 | } |
314 | |
315 | if (old) |
316 | list_del(&old->list); |
317 | } |
318 | |
319 | struct ieee80211_key * |
320 | ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, |
321 | const u8 *key_data, |
322 | size_t seq_len, const u8 *seq, |
323 | const struct ieee80211_cipher_scheme *cs) |
324 | { |
325 | struct ieee80211_key *key; |
326 | int i, j, err; |
327 | |
328 | BUG_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS); |
329 | |
330 | key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); |
331 | if (!key) |
332 | return ERR_PTR(-ENOMEM); |
333 | |
334 | /* |
335 | * Default to software encryption; we'll later upload the |
336 | * key to the hardware if possible. |
337 | */ |
338 | key->conf.flags = 0; |
339 | key->flags = 0; |
340 | |
341 | key->conf.cipher = cipher; |
342 | key->conf.keyidx = idx; |
343 | key->conf.keylen = key_len; |
344 | switch (cipher) { |
345 | case WLAN_CIPHER_SUITE_WEP40: |
346 | case WLAN_CIPHER_SUITE_WEP104: |
347 | key->conf.iv_len = IEEE80211_WEP_IV_LEN; |
348 | key->conf.icv_len = IEEE80211_WEP_ICV_LEN; |
349 | break; |
350 | case WLAN_CIPHER_SUITE_TKIP: |
351 | key->conf.iv_len = IEEE80211_TKIP_IV_LEN; |
352 | key->conf.icv_len = IEEE80211_TKIP_ICV_LEN; |
353 | if (seq) { |
354 | for (i = 0; i < IEEE80211_NUM_TIDS; i++) { |
355 | key->u.tkip.rx[i].iv32 = |
356 | get_unaligned_le32(&seq[2]); |
357 | key->u.tkip.rx[i].iv16 = |
358 | get_unaligned_le16(seq); |
359 | } |
360 | } |
361 | spin_lock_init(&key->u.tkip.txlock); |
362 | break; |
363 | case WLAN_CIPHER_SUITE_CCMP: |
364 | key->conf.iv_len = IEEE80211_CCMP_HDR_LEN; |
365 | key->conf.icv_len = IEEE80211_CCMP_MIC_LEN; |
366 | if (seq) { |
367 | for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) |
368 | for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++) |
369 | key->u.ccmp.rx_pn[i][j] = |
370 | seq[IEEE80211_CCMP_PN_LEN - j - 1]; |
371 | } |
372 | /* |
373 | * Initialize AES key state here as an optimization so that |
374 | * it does not need to be initialized for every packet. |
375 | */ |
376 | key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(key_data); |
377 | if (IS_ERR(key->u.ccmp.tfm)) { |
378 | err = PTR_ERR(key->u.ccmp.tfm); |
379 | kfree(key); |
380 | return ERR_PTR(err); |
381 | } |
382 | break; |
383 | case WLAN_CIPHER_SUITE_AES_CMAC: |
384 | key->conf.iv_len = 0; |
385 | key->conf.icv_len = sizeof(struct ieee80211_mmie); |
386 | if (seq) |
387 | for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++) |
388 | key->u.aes_cmac.rx_pn[j] = |
389 | seq[IEEE80211_CMAC_PN_LEN - j - 1]; |
390 | /* |
391 | * Initialize AES key state here as an optimization so that |
392 | * it does not need to be initialized for every packet. |
393 | */ |
394 | key->u.aes_cmac.tfm = |
395 | ieee80211_aes_cmac_key_setup(key_data); |
396 | if (IS_ERR(key->u.aes_cmac.tfm)) { |
397 | err = PTR_ERR(key->u.aes_cmac.tfm); |
398 | kfree(key); |
399 | return ERR_PTR(err); |
400 | } |
401 | break; |
402 | default: |
403 | if (cs) { |
404 | size_t len = (seq_len > MAX_PN_LEN) ? |
405 | MAX_PN_LEN : seq_len; |
406 | |
407 | key->conf.iv_len = cs->hdr_len; |
408 | key->conf.icv_len = cs->mic_len; |
409 | for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) |
410 | for (j = 0; j < len; j++) |
411 | key->u.gen.rx_pn[i][j] = |
412 | seq[len - j - 1]; |
413 | } |
414 | } |
415 | memcpy(key->conf.key, key_data, key_len); |
416 | INIT_LIST_HEAD(&key->list); |
417 | |
418 | return key; |
419 | } |
420 | |
421 | static void ieee80211_key_free_common(struct ieee80211_key *key) |
422 | { |
423 | if (key->conf.cipher == WLAN_CIPHER_SUITE_CCMP) |
424 | ieee80211_aes_key_free(key->u.ccmp.tfm); |
425 | if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC) |
426 | ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); |
427 | kfree(key); |
428 | } |
429 | |
430 | static void __ieee80211_key_destroy(struct ieee80211_key *key, |
431 | bool delay_tailroom) |
432 | { |
433 | if (key->local) |
434 | ieee80211_key_disable_hw_accel(key); |
435 | |
436 | if (key->local) { |
437 | struct ieee80211_sub_if_data *sdata = key->sdata; |
438 | |
439 | ieee80211_debugfs_key_remove(key); |
440 | |
441 | if (delay_tailroom) { |
442 | /* see ieee80211_delayed_tailroom_dec */ |
443 | sdata->crypto_tx_tailroom_pending_dec++; |
444 | schedule_delayed_work(&sdata->dec_tailroom_needed_wk, |
445 | HZ/2); |
446 | } else { |
447 | sdata->crypto_tx_tailroom_needed_cnt--; |
448 | } |
449 | } |
450 | |
451 | ieee80211_key_free_common(key); |
452 | } |
453 | |
454 | static void ieee80211_key_destroy(struct ieee80211_key *key, |
455 | bool delay_tailroom) |
456 | { |
457 | if (!key) |
458 | return; |
459 | |
460 | /* |
461 | * Synchronize so the TX path can no longer be using |
462 | * this key before we free/remove it. |
463 | */ |
464 | synchronize_net(); |
465 | |
466 | __ieee80211_key_destroy(key, delay_tailroom); |
467 | } |
468 | |
469 | void ieee80211_key_free_unused(struct ieee80211_key *key) |
470 | { |
471 | WARN_ON(key->sdata || key->local); |
472 | ieee80211_key_free_common(key); |
473 | } |
474 | |
475 | int ieee80211_key_link(struct ieee80211_key *key, |
476 | struct ieee80211_sub_if_data *sdata, |
477 | struct sta_info *sta) |
478 | { |
479 | struct ieee80211_local *local = sdata->local; |
480 | struct ieee80211_key *old_key; |
481 | int idx, ret; |
482 | bool pairwise; |
483 | |
484 | BUG_ON(!sdata); |
485 | BUG_ON(!key); |
486 | |
487 | pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE; |
488 | idx = key->conf.keyidx; |
489 | key->local = sdata->local; |
490 | key->sdata = sdata; |
491 | key->sta = sta; |
492 | |
493 | mutex_lock(&sdata->local->key_mtx); |
494 | |
495 | if (sta && pairwise) |
496 | old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]); |
497 | else if (sta) |
498 | old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]); |
499 | else |
500 | old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
501 | |
502 | increment_tailroom_need_count(sdata); |
503 | |
504 | ieee80211_key_replace(sdata, sta, pairwise, old_key, key); |
505 | ieee80211_key_destroy(old_key, true); |
506 | |
507 | ieee80211_debugfs_key_add(key); |
508 | |
509 | if (!local->wowlan) { |
510 | ret = ieee80211_key_enable_hw_accel(key); |
511 | if (ret) |
512 | ieee80211_key_free(key, true); |
513 | } else { |
514 | ret = 0; |
515 | } |
516 | |
517 | mutex_unlock(&sdata->local->key_mtx); |
518 | |
519 | return ret; |
520 | } |
521 | |
522 | void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom) |
523 | { |
524 | if (!key) |
525 | return; |
526 | |
527 | /* |
528 | * Replace key with nothingness if it was ever used. |
529 | */ |
530 | if (key->sdata) |
531 | ieee80211_key_replace(key->sdata, key->sta, |
532 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, |
533 | key, NULL); |
534 | ieee80211_key_destroy(key, delay_tailroom); |
535 | } |
536 | |
537 | void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata) |
538 | { |
539 | struct ieee80211_key *key; |
540 | |
541 | ASSERT_RTNL(); |
542 | |
543 | if (WARN_ON(!ieee80211_sdata_running(sdata))) |
544 | return; |
545 | |
546 | mutex_lock(&sdata->local->key_mtx); |
547 | |
548 | sdata->crypto_tx_tailroom_needed_cnt = 0; |
549 | |
550 | list_for_each_entry(key, &sdata->key_list, list) { |
551 | increment_tailroom_need_count(sdata); |
552 | ieee80211_key_enable_hw_accel(key); |
553 | } |
554 | |
555 | mutex_unlock(&sdata->local->key_mtx); |
556 | } |
557 | |
558 | void ieee80211_iter_keys(struct ieee80211_hw *hw, |
559 | struct ieee80211_vif *vif, |
560 | void (*iter)(struct ieee80211_hw *hw, |
561 | struct ieee80211_vif *vif, |
562 | struct ieee80211_sta *sta, |
563 | struct ieee80211_key_conf *key, |
564 | void *data), |
565 | void *iter_data) |
566 | { |
567 | struct ieee80211_local *local = hw_to_local(hw); |
568 | struct ieee80211_key *key, *tmp; |
569 | struct ieee80211_sub_if_data *sdata; |
570 | |
571 | ASSERT_RTNL(); |
572 | |
573 | mutex_lock(&local->key_mtx); |
574 | if (vif) { |
575 | sdata = vif_to_sdata(vif); |
576 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) |
577 | iter(hw, &sdata->vif, |
578 | key->sta ? &key->sta->sta : NULL, |
579 | &key->conf, iter_data); |
580 | } else { |
581 | list_for_each_entry(sdata, &local->interfaces, list) |
582 | list_for_each_entry_safe(key, tmp, |
583 | &sdata->key_list, list) |
584 | iter(hw, &sdata->vif, |
585 | key->sta ? &key->sta->sta : NULL, |
586 | &key->conf, iter_data); |
587 | } |
588 | mutex_unlock(&local->key_mtx); |
589 | } |
590 | EXPORT_SYMBOL(ieee80211_iter_keys); |
591 | |
592 | static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata, |
593 | struct list_head *keys) |
594 | { |
595 | struct ieee80211_key *key, *tmp; |
596 | |
597 | sdata->crypto_tx_tailroom_needed_cnt -= |
598 | sdata->crypto_tx_tailroom_pending_dec; |
599 | sdata->crypto_tx_tailroom_pending_dec = 0; |
600 | |
601 | ieee80211_debugfs_key_remove_mgmt_default(sdata); |
602 | |
603 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) { |
604 | ieee80211_key_replace(key->sdata, key->sta, |
605 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, |
606 | key, NULL); |
607 | list_add_tail(&key->list, keys); |
608 | } |
609 | |
610 | ieee80211_debugfs_key_update_default(sdata); |
611 | } |
612 | |
613 | void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata, |
614 | bool force_synchronize) |
615 | { |
616 | struct ieee80211_local *local = sdata->local; |
617 | struct ieee80211_sub_if_data *vlan; |
618 | struct ieee80211_key *key, *tmp; |
619 | LIST_HEAD(keys); |
620 | |
621 | cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk); |
622 | |
623 | mutex_lock(&local->key_mtx); |
624 | |
625 | ieee80211_free_keys_iface(sdata, &keys); |
626 | |
627 | if (sdata->vif.type == NL80211_IFTYPE_AP) { |
628 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) |
629 | ieee80211_free_keys_iface(vlan, &keys); |
630 | } |
631 | |
632 | if (!list_empty(&keys) || force_synchronize) |
633 | synchronize_net(); |
634 | list_for_each_entry_safe(key, tmp, &keys, list) |
635 | __ieee80211_key_destroy(key, false); |
636 | |
637 | WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || |
638 | sdata->crypto_tx_tailroom_pending_dec); |
639 | if (sdata->vif.type == NL80211_IFTYPE_AP) { |
640 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) |
641 | WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt || |
642 | vlan->crypto_tx_tailroom_pending_dec); |
643 | } |
644 | |
645 | mutex_unlock(&local->key_mtx); |
646 | } |
647 | |
648 | void ieee80211_free_sta_keys(struct ieee80211_local *local, |
649 | struct sta_info *sta) |
650 | { |
651 | struct ieee80211_key *key; |
652 | int i; |
653 | |
654 | mutex_lock(&local->key_mtx); |
655 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { |
656 | key = key_mtx_dereference(local, sta->gtk[i]); |
657 | if (!key) |
658 | continue; |
659 | ieee80211_key_replace(key->sdata, key->sta, |
660 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, |
661 | key, NULL); |
662 | __ieee80211_key_destroy(key, true); |
663 | } |
664 | |
665 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { |
666 | key = key_mtx_dereference(local, sta->ptk[i]); |
667 | if (!key) |
668 | continue; |
669 | ieee80211_key_replace(key->sdata, key->sta, |
670 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, |
671 | key, NULL); |
672 | __ieee80211_key_destroy(key, true); |
673 | } |
674 | |
675 | mutex_unlock(&local->key_mtx); |
676 | } |
677 | |
678 | void ieee80211_delayed_tailroom_dec(struct work_struct *wk) |
679 | { |
680 | struct ieee80211_sub_if_data *sdata; |
681 | |
682 | sdata = container_of(wk, struct ieee80211_sub_if_data, |
683 | dec_tailroom_needed_wk.work); |
684 | |
685 | /* |
686 | * The reason for the delayed tailroom needed decrementing is to |
687 | * make roaming faster: during roaming, all keys are first deleted |
688 | * and then new keys are installed. The first new key causes the |
689 | * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes |
690 | * the cost of synchronize_net() (which can be slow). Avoid this |
691 | * by deferring the crypto_tx_tailroom_needed_cnt decrementing on |
692 | * key removal for a while, so if we roam the value is larger than |
693 | * zero and no 0->1 transition happens. |
694 | * |
695 | * The cost is that if the AP switching was from an AP with keys |
696 | * to one without, we still allocate tailroom while it would no |
697 | * longer be needed. However, in the typical (fast) roaming case |
698 | * within an ESS this usually won't happen. |
699 | */ |
700 | |
701 | mutex_lock(&sdata->local->key_mtx); |
702 | sdata->crypto_tx_tailroom_needed_cnt -= |
703 | sdata->crypto_tx_tailroom_pending_dec; |
704 | sdata->crypto_tx_tailroom_pending_dec = 0; |
705 | mutex_unlock(&sdata->local->key_mtx); |
706 | } |
707 | |
708 | void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid, |
709 | const u8 *replay_ctr, gfp_t gfp) |
710 | { |
711 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
712 | |
713 | trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr); |
714 | |
715 | cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp); |
716 | } |
717 | EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify); |
718 | |
719 | void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf, |
720 | struct ieee80211_key_seq *seq) |
721 | { |
722 | struct ieee80211_key *key; |
723 | u64 pn64; |
724 | |
725 | if (WARN_ON(!(keyconf->flags & IEEE80211_KEY_FLAG_GENERATE_IV))) |
726 | return; |
727 | |
728 | key = container_of(keyconf, struct ieee80211_key, conf); |
729 | |
730 | switch (key->conf.cipher) { |
731 | case WLAN_CIPHER_SUITE_TKIP: |
732 | seq->tkip.iv32 = key->u.tkip.tx.iv32; |
733 | seq->tkip.iv16 = key->u.tkip.tx.iv16; |
734 | break; |
735 | case WLAN_CIPHER_SUITE_CCMP: |
736 | pn64 = atomic64_read(&key->u.ccmp.tx_pn); |
737 | seq->ccmp.pn[5] = pn64; |
738 | seq->ccmp.pn[4] = pn64 >> 8; |
739 | seq->ccmp.pn[3] = pn64 >> 16; |
740 | seq->ccmp.pn[2] = pn64 >> 24; |
741 | seq->ccmp.pn[1] = pn64 >> 32; |
742 | seq->ccmp.pn[0] = pn64 >> 40; |
743 | break; |
744 | case WLAN_CIPHER_SUITE_AES_CMAC: |
745 | pn64 = atomic64_read(&key->u.aes_cmac.tx_pn); |
746 | seq->ccmp.pn[5] = pn64; |
747 | seq->ccmp.pn[4] = pn64 >> 8; |
748 | seq->ccmp.pn[3] = pn64 >> 16; |
749 | seq->ccmp.pn[2] = pn64 >> 24; |
750 | seq->ccmp.pn[1] = pn64 >> 32; |
751 | seq->ccmp.pn[0] = pn64 >> 40; |
752 | break; |
753 | default: |
754 | WARN_ON(1); |
755 | } |
756 | } |
757 | EXPORT_SYMBOL(ieee80211_get_key_tx_seq); |
758 | |
759 | void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf, |
760 | int tid, struct ieee80211_key_seq *seq) |
761 | { |
762 | struct ieee80211_key *key; |
763 | const u8 *pn; |
764 | |
765 | key = container_of(keyconf, struct ieee80211_key, conf); |
766 | |
767 | switch (key->conf.cipher) { |
768 | case WLAN_CIPHER_SUITE_TKIP: |
769 | if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) |
770 | return; |
771 | seq->tkip.iv32 = key->u.tkip.rx[tid].iv32; |
772 | seq->tkip.iv16 = key->u.tkip.rx[tid].iv16; |
773 | break; |
774 | case WLAN_CIPHER_SUITE_CCMP: |
775 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) |
776 | return; |
777 | if (tid < 0) |
778 | pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; |
779 | else |
780 | pn = key->u.ccmp.rx_pn[tid]; |
781 | memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN); |
782 | break; |
783 | case WLAN_CIPHER_SUITE_AES_CMAC: |
784 | if (WARN_ON(tid != 0)) |
785 | return; |
786 | pn = key->u.aes_cmac.rx_pn; |
787 | memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN); |
788 | break; |
789 | } |
790 | } |
791 | EXPORT_SYMBOL(ieee80211_get_key_rx_seq); |
792 | |
793 | void ieee80211_set_key_tx_seq(struct ieee80211_key_conf *keyconf, |
794 | struct ieee80211_key_seq *seq) |
795 | { |
796 | struct ieee80211_key *key; |
797 | u64 pn64; |
798 | |
799 | key = container_of(keyconf, struct ieee80211_key, conf); |
800 | |
801 | switch (key->conf.cipher) { |
802 | case WLAN_CIPHER_SUITE_TKIP: |
803 | key->u.tkip.tx.iv32 = seq->tkip.iv32; |
804 | key->u.tkip.tx.iv16 = seq->tkip.iv16; |
805 | break; |
806 | case WLAN_CIPHER_SUITE_CCMP: |
807 | pn64 = (u64)seq->ccmp.pn[5] | |
808 | ((u64)seq->ccmp.pn[4] << 8) | |
809 | ((u64)seq->ccmp.pn[3] << 16) | |
810 | ((u64)seq->ccmp.pn[2] << 24) | |
811 | ((u64)seq->ccmp.pn[1] << 32) | |
812 | ((u64)seq->ccmp.pn[0] << 40); |
813 | atomic64_set(&key->u.ccmp.tx_pn, pn64); |
814 | break; |
815 | case WLAN_CIPHER_SUITE_AES_CMAC: |
816 | pn64 = (u64)seq->aes_cmac.pn[5] | |
817 | ((u64)seq->aes_cmac.pn[4] << 8) | |
818 | ((u64)seq->aes_cmac.pn[3] << 16) | |
819 | ((u64)seq->aes_cmac.pn[2] << 24) | |
820 | ((u64)seq->aes_cmac.pn[1] << 32) | |
821 | ((u64)seq->aes_cmac.pn[0] << 40); |
822 | atomic64_set(&key->u.aes_cmac.tx_pn, pn64); |
823 | break; |
824 | default: |
825 | WARN_ON(1); |
826 | break; |
827 | } |
828 | } |
829 | EXPORT_SYMBOL_GPL(ieee80211_set_key_tx_seq); |
830 | |
831 | void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf, |
832 | int tid, struct ieee80211_key_seq *seq) |
833 | { |
834 | struct ieee80211_key *key; |
835 | u8 *pn; |
836 | |
837 | key = container_of(keyconf, struct ieee80211_key, conf); |
838 | |
839 | switch (key->conf.cipher) { |
840 | case WLAN_CIPHER_SUITE_TKIP: |
841 | if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) |
842 | return; |
843 | key->u.tkip.rx[tid].iv32 = seq->tkip.iv32; |
844 | key->u.tkip.rx[tid].iv16 = seq->tkip.iv16; |
845 | break; |
846 | case WLAN_CIPHER_SUITE_CCMP: |
847 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) |
848 | return; |
849 | if (tid < 0) |
850 | pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; |
851 | else |
852 | pn = key->u.ccmp.rx_pn[tid]; |
853 | memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN); |
854 | break; |
855 | case WLAN_CIPHER_SUITE_AES_CMAC: |
856 | if (WARN_ON(tid != 0)) |
857 | return; |
858 | pn = key->u.aes_cmac.rx_pn; |
859 | memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN); |
860 | break; |
861 | default: |
862 | WARN_ON(1); |
863 | break; |
864 | } |
865 | } |
866 | EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq); |
867 | |
868 | void ieee80211_remove_key(struct ieee80211_key_conf *keyconf) |
869 | { |
870 | struct ieee80211_key *key; |
871 | |
872 | key = container_of(keyconf, struct ieee80211_key, conf); |
873 | |
874 | assert_key_lock(key->local); |
875 | |
876 | /* |
877 | * if key was uploaded, we assume the driver will/has remove(d) |
878 | * it, so adjust bookkeeping accordingly |
879 | */ |
880 | if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { |
881 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; |
882 | |
883 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
884 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) || |
885 | (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))) |
886 | increment_tailroom_need_count(key->sdata); |
887 | } |
888 | |
889 | ieee80211_key_free(key, false); |
890 | } |
891 | EXPORT_SYMBOL_GPL(ieee80211_remove_key); |
892 | |
893 | struct ieee80211_key_conf * |
894 | ieee80211_gtk_rekey_add(struct ieee80211_vif *vif, |
895 | struct ieee80211_key_conf *keyconf) |
896 | { |
897 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
898 | struct ieee80211_local *local = sdata->local; |
899 | struct ieee80211_key *key; |
900 | int err; |
901 | |
902 | if (WARN_ON(!local->wowlan)) |
903 | return ERR_PTR(-EINVAL); |
904 | |
905 | if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) |
906 | return ERR_PTR(-EINVAL); |
907 | |
908 | key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx, |
909 | keyconf->keylen, keyconf->key, |
910 | 0, NULL, NULL); |
911 | if (IS_ERR(key)) |
912 | return ERR_CAST(key); |
913 | |
914 | if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED) |
915 | key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT; |
916 | |
917 | err = ieee80211_key_link(key, sdata, NULL); |
918 | if (err) |
919 | return ERR_PTR(err); |
920 | |
921 | return &key->conf; |
922 | } |
923 | EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add); |
924 |
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