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Commit | Line | Data |
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1f5a7e47 JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
3b96766f | 5 | * Copyright 2007-2008 Johannes Berg <johannes@sipsolutions.net> |
1f5a7e47 JB |
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 | ||
11a843b7 JB |
12 | #include <linux/if_ether.h> |
13 | #include <linux/etherdevice.h> | |
14 | #include <linux/list.h> | |
d4e46a3d | 15 | #include <linux/rcupdate.h> |
db4d1169 | 16 | #include <linux/rtnetlink.h> |
5a0e3ad6 | 17 | #include <linux/slab.h> |
bc3b2d7f | 18 | #include <linux/export.h> |
1f5a7e47 JB |
19 | #include <net/mac80211.h> |
20 | #include "ieee80211_i.h" | |
24487981 | 21 | #include "driver-ops.h" |
1f5a7e47 JB |
22 | #include "debugfs_key.h" |
23 | #include "aes_ccm.h" | |
3cfcf6ac | 24 | #include "aes_cmac.h" |
1f5a7e47 | 25 | |
11a843b7 | 26 | |
dbbea671 JB |
27 | /** |
28 | * DOC: Key handling basics | |
11a843b7 JB |
29 | * |
30 | * Key handling in mac80211 is done based on per-interface (sub_if_data) | |
31 | * keys and per-station keys. Since each station belongs to an interface, | |
32 | * each station key also belongs to that interface. | |
33 | * | |
b5c34f66 JB |
34 | * Hardware acceleration is done on a best-effort basis for algorithms |
35 | * that are implemented in software, for each key the hardware is asked | |
36 | * to enable that key for offloading but if it cannot do that the key is | |
37 | * simply kept for software encryption (unless it is for an algorithm | |
38 | * that isn't implemented in software). | |
39 | * There is currently no way of knowing whether a key is handled in SW | |
40 | * or HW except by looking into debugfs. | |
11a843b7 | 41 | * |
b5c34f66 JB |
42 | * All key management is internally protected by a mutex. Within all |
43 | * other parts of mac80211, key references are, just as STA structure | |
44 | * references, protected by RCU. Note, however, that some things are | |
45 | * unprotected, namely the key->sta dereferences within the hardware | |
46 | * acceleration functions. This means that sta_info_destroy() must | |
47 | * remove the key which waits for an RCU grace period. | |
11a843b7 JB |
48 | */ |
49 | ||
50 | static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; | |
11a843b7 | 51 | |
ad0e2b5a | 52 | static void assert_key_lock(struct ieee80211_local *local) |
3b96766f | 53 | { |
46a5ebaf | 54 | lockdep_assert_held(&local->key_mtx); |
3b96766f JB |
55 | } |
56 | ||
dc822b5d | 57 | static struct ieee80211_sta *get_sta_for_key(struct ieee80211_key *key) |
11a843b7 | 58 | { |
11a843b7 | 59 | if (key->sta) |
dc822b5d | 60 | return &key->sta->sta; |
11a843b7 | 61 | |
dc822b5d | 62 | return NULL; |
11a843b7 JB |
63 | } |
64 | ||
3bff1865 YAP |
65 | static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata) |
66 | { | |
67 | /* | |
68 | * When this count is zero, SKB resizing for allocating tailroom | |
69 | * for IV or MMIC is skipped. But, this check has created two race | |
70 | * cases in xmit path while transiting from zero count to one: | |
71 | * | |
72 | * 1. SKB resize was skipped because no key was added but just before | |
73 | * the xmit key is added and SW encryption kicks off. | |
74 | * | |
75 | * 2. SKB resize was skipped because all the keys were hw planted but | |
76 | * just before xmit one of the key is deleted and SW encryption kicks | |
77 | * off. | |
78 | * | |
79 | * In both the above case SW encryption will find not enough space for | |
80 | * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c) | |
81 | * | |
82 | * Solution has been explained at | |
83 | * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net | |
84 | */ | |
85 | ||
86 | if (!sdata->crypto_tx_tailroom_needed_cnt++) { | |
87 | /* | |
88 | * Flush all XMIT packets currently using HW encryption or no | |
89 | * encryption at all if the count transition is from 0 -> 1. | |
90 | */ | |
91 | synchronize_net(); | |
92 | } | |
93 | } | |
94 | ||
3ffc2a90 | 95 | static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key) |
11a843b7 | 96 | { |
dc822b5d JB |
97 | struct ieee80211_sub_if_data *sdata; |
98 | struct ieee80211_sta *sta; | |
11a843b7 JB |
99 | int ret; |
100 | ||
3b96766f JB |
101 | might_sleep(); |
102 | ||
e31b8213 | 103 | if (!key->local->ops->set_key) |
3ffc2a90 | 104 | goto out_unsupported; |
11a843b7 | 105 | |
ad0e2b5a JB |
106 | assert_key_lock(key->local); |
107 | ||
dc822b5d JB |
108 | sta = get_sta_for_key(key); |
109 | ||
e31b8213 JB |
110 | /* |
111 | * If this is a per-STA GTK, check if it | |
112 | * is supported; if not, return. | |
113 | */ | |
114 | if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) && | |
115 | !(key->local->hw.flags & IEEE80211_HW_SUPPORTS_PER_STA_GTK)) | |
116 | goto out_unsupported; | |
117 | ||
dc822b5d | 118 | sdata = key->sdata; |
18890d4b HS |
119 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { |
120 | /* | |
121 | * The driver doesn't know anything about VLAN interfaces. | |
122 | * Hence, don't send GTKs for VLAN interfaces to the driver. | |
123 | */ | |
124 | if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) | |
125 | goto out_unsupported; | |
18890d4b | 126 | } |
11a843b7 | 127 | |
12375ef9 | 128 | ret = drv_set_key(key->local, SET_KEY, sdata, sta, &key->conf); |
11a843b7 | 129 | |
e31b8213 | 130 | if (!ret) { |
11a843b7 | 131 | key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; |
3bff1865 YAP |
132 | |
133 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || | |
077a9154 AN |
134 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) || |
135 | (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))) | |
3bff1865 YAP |
136 | sdata->crypto_tx_tailroom_needed_cnt--; |
137 | ||
077a9154 AN |
138 | WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && |
139 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)); | |
140 | ||
e31b8213 JB |
141 | return 0; |
142 | } | |
11a843b7 | 143 | |
e31b8213 | 144 | if (ret != -ENOSPC && ret != -EOPNOTSUPP) |
0fb9a9ec JP |
145 | wiphy_err(key->local->hw.wiphy, |
146 | "failed to set key (%d, %pM) to hardware (%d)\n", | |
147 | key->conf.keyidx, sta ? sta->addr : bcast_addr, ret); | |
3ffc2a90 | 148 | |
e31b8213 JB |
149 | out_unsupported: |
150 | switch (key->conf.cipher) { | |
151 | case WLAN_CIPHER_SUITE_WEP40: | |
152 | case WLAN_CIPHER_SUITE_WEP104: | |
153 | case WLAN_CIPHER_SUITE_TKIP: | |
154 | case WLAN_CIPHER_SUITE_CCMP: | |
155 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
156 | /* all of these we can do in software */ | |
157 | return 0; | |
158 | default: | |
159 | return -EINVAL; | |
3ffc2a90 | 160 | } |
11a843b7 JB |
161 | } |
162 | ||
163 | static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key) | |
164 | { | |
dc822b5d JB |
165 | struct ieee80211_sub_if_data *sdata; |
166 | struct ieee80211_sta *sta; | |
11a843b7 JB |
167 | int ret; |
168 | ||
3b96766f JB |
169 | might_sleep(); |
170 | ||
db4d1169 | 171 | if (!key || !key->local->ops->set_key) |
11a843b7 JB |
172 | return; |
173 | ||
ad0e2b5a JB |
174 | assert_key_lock(key->local); |
175 | ||
176 | if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) | |
11a843b7 JB |
177 | return; |
178 | ||
dc822b5d JB |
179 | sta = get_sta_for_key(key); |
180 | sdata = key->sdata; | |
181 | ||
3bff1865 | 182 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
077a9154 AN |
183 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) || |
184 | (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))) | |
3bff1865 YAP |
185 | increment_tailroom_need_count(sdata); |
186 | ||
12375ef9 | 187 | ret = drv_set_key(key->local, DISABLE_KEY, sdata, |
24487981 | 188 | sta, &key->conf); |
11a843b7 JB |
189 | |
190 | if (ret) | |
0fb9a9ec JP |
191 | wiphy_err(key->local->hw.wiphy, |
192 | "failed to remove key (%d, %pM) from hardware (%d)\n", | |
193 | key->conf.keyidx, sta ? sta->addr : bcast_addr, ret); | |
11a843b7 | 194 | |
3b96766f | 195 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; |
3b96766f JB |
196 | } |
197 | ||
e31b8213 JB |
198 | void ieee80211_key_removed(struct ieee80211_key_conf *key_conf) |
199 | { | |
200 | struct ieee80211_key *key; | |
201 | ||
202 | key = container_of(key_conf, struct ieee80211_key, conf); | |
203 | ||
204 | might_sleep(); | |
205 | assert_key_lock(key->local); | |
206 | ||
207 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; | |
208 | ||
209 | /* | |
210 | * Flush TX path to avoid attempts to use this key | |
211 | * after this function returns. Until then, drivers | |
212 | * must be prepared to handle the key. | |
213 | */ | |
214 | synchronize_rcu(); | |
215 | } | |
216 | EXPORT_SYMBOL_GPL(ieee80211_key_removed); | |
217 | ||
3b96766f | 218 | static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, |
f7e0104c | 219 | int idx, bool uni, bool multi) |
3b96766f JB |
220 | { |
221 | struct ieee80211_key *key = NULL; | |
222 | ||
ad0e2b5a JB |
223 | assert_key_lock(sdata->local); |
224 | ||
3b96766f | 225 | if (idx >= 0 && idx < NUM_DEFAULT_KEYS) |
40b275b6 | 226 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
3b96766f | 227 | |
f7e0104c JB |
228 | if (uni) |
229 | rcu_assign_pointer(sdata->default_unicast_key, key); | |
230 | if (multi) | |
231 | rcu_assign_pointer(sdata->default_multicast_key, key); | |
3b96766f | 232 | |
f7e0104c | 233 | ieee80211_debugfs_key_update_default(sdata); |
3b96766f JB |
234 | } |
235 | ||
f7e0104c JB |
236 | void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx, |
237 | bool uni, bool multi) | |
3b96766f | 238 | { |
ad0e2b5a | 239 | mutex_lock(&sdata->local->key_mtx); |
f7e0104c | 240 | __ieee80211_set_default_key(sdata, idx, uni, multi); |
ad0e2b5a | 241 | mutex_unlock(&sdata->local->key_mtx); |
3b96766f JB |
242 | } |
243 | ||
3cfcf6ac JM |
244 | static void |
245 | __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx) | |
246 | { | |
247 | struct ieee80211_key *key = NULL; | |
248 | ||
ad0e2b5a JB |
249 | assert_key_lock(sdata->local); |
250 | ||
3cfcf6ac JM |
251 | if (idx >= NUM_DEFAULT_KEYS && |
252 | idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
40b275b6 | 253 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
3cfcf6ac JM |
254 | |
255 | rcu_assign_pointer(sdata->default_mgmt_key, key); | |
256 | ||
f7e0104c | 257 | ieee80211_debugfs_key_update_default(sdata); |
3cfcf6ac JM |
258 | } |
259 | ||
260 | void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, | |
261 | int idx) | |
262 | { | |
ad0e2b5a | 263 | mutex_lock(&sdata->local->key_mtx); |
3cfcf6ac | 264 | __ieee80211_set_default_mgmt_key(sdata, idx); |
ad0e2b5a | 265 | mutex_unlock(&sdata->local->key_mtx); |
3cfcf6ac JM |
266 | } |
267 | ||
3b96766f JB |
268 | |
269 | static void __ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, | |
270 | struct sta_info *sta, | |
e31b8213 | 271 | bool pairwise, |
3b96766f JB |
272 | struct ieee80211_key *old, |
273 | struct ieee80211_key *new) | |
274 | { | |
f7e0104c JB |
275 | int idx; |
276 | bool defunikey, defmultikey, defmgmtkey; | |
3b96766f JB |
277 | |
278 | if (new) | |
f850e00f | 279 | list_add_tail(&new->list, &sdata->key_list); |
3b96766f | 280 | |
e31b8213 JB |
281 | if (sta && pairwise) { |
282 | rcu_assign_pointer(sta->ptk, new); | |
283 | } else if (sta) { | |
284 | if (old) | |
285 | idx = old->conf.keyidx; | |
286 | else | |
287 | idx = new->conf.keyidx; | |
288 | rcu_assign_pointer(sta->gtk[idx], new); | |
3b96766f JB |
289 | } else { |
290 | WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx); | |
291 | ||
292 | if (old) | |
293 | idx = old->conf.keyidx; | |
294 | else | |
295 | idx = new->conf.keyidx; | |
296 | ||
40b275b6 JB |
297 | defunikey = old && |
298 | old == key_mtx_dereference(sdata->local, | |
299 | sdata->default_unicast_key); | |
300 | defmultikey = old && | |
301 | old == key_mtx_dereference(sdata->local, | |
302 | sdata->default_multicast_key); | |
303 | defmgmtkey = old && | |
304 | old == key_mtx_dereference(sdata->local, | |
305 | sdata->default_mgmt_key); | |
3b96766f | 306 | |
f7e0104c JB |
307 | if (defunikey && !new) |
308 | __ieee80211_set_default_key(sdata, -1, true, false); | |
309 | if (defmultikey && !new) | |
310 | __ieee80211_set_default_key(sdata, -1, false, true); | |
3cfcf6ac JM |
311 | if (defmgmtkey && !new) |
312 | __ieee80211_set_default_mgmt_key(sdata, -1); | |
3b96766f JB |
313 | |
314 | rcu_assign_pointer(sdata->keys[idx], new); | |
f7e0104c JB |
315 | if (defunikey && new) |
316 | __ieee80211_set_default_key(sdata, new->conf.keyidx, | |
317 | true, false); | |
318 | if (defmultikey && new) | |
319 | __ieee80211_set_default_key(sdata, new->conf.keyidx, | |
320 | false, true); | |
3cfcf6ac JM |
321 | if (defmgmtkey && new) |
322 | __ieee80211_set_default_mgmt_key(sdata, | |
323 | new->conf.keyidx); | |
3b96766f JB |
324 | } |
325 | ||
b5c34f66 JB |
326 | if (old) |
327 | list_del(&old->list); | |
11a843b7 JB |
328 | } |
329 | ||
97359d12 | 330 | struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, |
faa8fdc8 JM |
331 | const u8 *key_data, |
332 | size_t seq_len, const u8 *seq) | |
1f5a7e47 JB |
333 | { |
334 | struct ieee80211_key *key; | |
1ac62ba7 | 335 | int i, j, err; |
1f5a7e47 | 336 | |
3cfcf6ac | 337 | BUG_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS); |
11a843b7 JB |
338 | |
339 | key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); | |
1f5a7e47 | 340 | if (!key) |
1ac62ba7 | 341 | return ERR_PTR(-ENOMEM); |
11a843b7 JB |
342 | |
343 | /* | |
344 | * Default to software encryption; we'll later upload the | |
345 | * key to the hardware if possible. | |
346 | */ | |
11a843b7 JB |
347 | key->conf.flags = 0; |
348 | key->flags = 0; | |
349 | ||
97359d12 | 350 | key->conf.cipher = cipher; |
11a843b7 JB |
351 | key->conf.keyidx = idx; |
352 | key->conf.keylen = key_len; | |
97359d12 JB |
353 | switch (cipher) { |
354 | case WLAN_CIPHER_SUITE_WEP40: | |
355 | case WLAN_CIPHER_SUITE_WEP104: | |
76708dee FF |
356 | key->conf.iv_len = WEP_IV_LEN; |
357 | key->conf.icv_len = WEP_ICV_LEN; | |
358 | break; | |
97359d12 | 359 | case WLAN_CIPHER_SUITE_TKIP: |
76708dee FF |
360 | key->conf.iv_len = TKIP_IV_LEN; |
361 | key->conf.icv_len = TKIP_ICV_LEN; | |
9f26a952 | 362 | if (seq) { |
faa8fdc8 JM |
363 | for (i = 0; i < NUM_RX_DATA_QUEUES; i++) { |
364 | key->u.tkip.rx[i].iv32 = | |
365 | get_unaligned_le32(&seq[2]); | |
366 | key->u.tkip.rx[i].iv16 = | |
367 | get_unaligned_le16(seq); | |
368 | } | |
369 | } | |
523b02ea | 370 | spin_lock_init(&key->u.tkip.txlock); |
76708dee | 371 | break; |
97359d12 | 372 | case WLAN_CIPHER_SUITE_CCMP: |
76708dee FF |
373 | key->conf.iv_len = CCMP_HDR_LEN; |
374 | key->conf.icv_len = CCMP_MIC_LEN; | |
9f26a952 | 375 | if (seq) { |
9190252c | 376 | for (i = 0; i < NUM_RX_DATA_QUEUES + 1; i++) |
faa8fdc8 JM |
377 | for (j = 0; j < CCMP_PN_LEN; j++) |
378 | key->u.ccmp.rx_pn[i][j] = | |
379 | seq[CCMP_PN_LEN - j - 1]; | |
380 | } | |
11a843b7 JB |
381 | /* |
382 | * Initialize AES key state here as an optimization so that | |
383 | * it does not need to be initialized for every packet. | |
384 | */ | |
385 | key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(key_data); | |
1ac62ba7 BH |
386 | if (IS_ERR(key->u.ccmp.tfm)) { |
387 | err = PTR_ERR(key->u.ccmp.tfm); | |
3b96766f | 388 | kfree(key); |
1f951a7f | 389 | return ERR_PTR(err); |
11a843b7 | 390 | } |
60ae0f20 JB |
391 | break; |
392 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
393 | key->conf.iv_len = 0; | |
394 | key->conf.icv_len = sizeof(struct ieee80211_mmie); | |
395 | if (seq) | |
396 | for (j = 0; j < 6; j++) | |
397 | key->u.aes_cmac.rx_pn[j] = seq[6 - j - 1]; | |
3cfcf6ac JM |
398 | /* |
399 | * Initialize AES key state here as an optimization so that | |
400 | * it does not need to be initialized for every packet. | |
401 | */ | |
402 | key->u.aes_cmac.tfm = | |
403 | ieee80211_aes_cmac_key_setup(key_data); | |
1ac62ba7 BH |
404 | if (IS_ERR(key->u.aes_cmac.tfm)) { |
405 | err = PTR_ERR(key->u.aes_cmac.tfm); | |
3cfcf6ac | 406 | kfree(key); |
1f951a7f | 407 | return ERR_PTR(err); |
3cfcf6ac | 408 | } |
60ae0f20 | 409 | break; |
3cfcf6ac | 410 | } |
60ae0f20 JB |
411 | memcpy(key->conf.key, key_data, key_len); |
412 | INIT_LIST_HEAD(&key->list); | |
3cfcf6ac | 413 | |
db4d1169 JB |
414 | return key; |
415 | } | |
11a843b7 | 416 | |
ad0e2b5a JB |
417 | static void __ieee80211_key_destroy(struct ieee80211_key *key) |
418 | { | |
419 | if (!key) | |
420 | return; | |
421 | ||
d2460f4b JB |
422 | /* |
423 | * Synchronize so the TX path can no longer be using | |
424 | * this key before we free/remove it. | |
425 | */ | |
426 | synchronize_rcu(); | |
427 | ||
32162a4d JM |
428 | if (key->local) |
429 | ieee80211_key_disable_hw_accel(key); | |
ad0e2b5a | 430 | |
97359d12 | 431 | if (key->conf.cipher == WLAN_CIPHER_SUITE_CCMP) |
ad0e2b5a | 432 | ieee80211_aes_key_free(key->u.ccmp.tfm); |
97359d12 | 433 | if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC) |
ad0e2b5a | 434 | ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); |
3bff1865 | 435 | if (key->local) { |
32162a4d | 436 | ieee80211_debugfs_key_remove(key); |
3bff1865 YAP |
437 | key->sdata->crypto_tx_tailroom_needed_cnt--; |
438 | } | |
ad0e2b5a JB |
439 | |
440 | kfree(key); | |
441 | } | |
442 | ||
3ffc2a90 JB |
443 | int ieee80211_key_link(struct ieee80211_key *key, |
444 | struct ieee80211_sub_if_data *sdata, | |
445 | struct sta_info *sta) | |
db4d1169 JB |
446 | { |
447 | struct ieee80211_key *old_key; | |
3ffc2a90 | 448 | int idx, ret; |
67aa030c | 449 | bool pairwise; |
db4d1169 | 450 | |
db4d1169 JB |
451 | BUG_ON(!sdata); |
452 | BUG_ON(!key); | |
453 | ||
67aa030c | 454 | pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE; |
db4d1169 JB |
455 | idx = key->conf.keyidx; |
456 | key->local = sdata->local; | |
457 | key->sdata = sdata; | |
458 | key->sta = sta; | |
459 | ||
11a843b7 | 460 | if (sta) { |
11a843b7 JB |
461 | /* |
462 | * some hardware cannot handle TKIP with QoS, so | |
463 | * we indicate whether QoS could be in use. | |
464 | */ | |
c2c98fde | 465 | if (test_sta_flag(sta, WLAN_STA_WME)) |
11a843b7 JB |
466 | key->conf.flags |= IEEE80211_KEY_FLAG_WMM_STA; |
467 | } else { | |
05c914fe | 468 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { |
11a843b7 JB |
469 | struct sta_info *ap; |
470 | ||
3b96766f | 471 | /* |
b5c34f66 JB |
472 | * We're getting a sta pointer in, so must be under |
473 | * appropriate locking for sta_info_get(). | |
3b96766f | 474 | */ |
d0709a65 | 475 | |
11a843b7 | 476 | /* same here, the AP could be using QoS */ |
abe60632 | 477 | ap = sta_info_get(key->sdata, key->sdata->u.mgd.bssid); |
11a843b7 | 478 | if (ap) { |
c2c98fde | 479 | if (test_sta_flag(ap, WLAN_STA_WME)) |
11a843b7 JB |
480 | key->conf.flags |= |
481 | IEEE80211_KEY_FLAG_WMM_STA; | |
11a843b7 JB |
482 | } |
483 | } | |
11a843b7 JB |
484 | } |
485 | ||
ad0e2b5a | 486 | mutex_lock(&sdata->local->key_mtx); |
3b96766f | 487 | |
e31b8213 | 488 | if (sta && pairwise) |
40b275b6 | 489 | old_key = key_mtx_dereference(sdata->local, sta->ptk); |
e31b8213 | 490 | else if (sta) |
40b275b6 | 491 | old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]); |
d4e46a3d | 492 | else |
40b275b6 | 493 | old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
db4d1169 | 494 | |
3bff1865 YAP |
495 | increment_tailroom_need_count(sdata); |
496 | ||
e31b8213 | 497 | __ieee80211_key_replace(sdata, sta, pairwise, old_key, key); |
ad0e2b5a | 498 | __ieee80211_key_destroy(old_key); |
d4e46a3d | 499 | |
ad0e2b5a | 500 | ieee80211_debugfs_key_add(key); |
db4d1169 | 501 | |
3ffc2a90 | 502 | ret = ieee80211_key_enable_hw_accel(key); |
523d2f69 | 503 | |
ad0e2b5a | 504 | mutex_unlock(&sdata->local->key_mtx); |
3ffc2a90 JB |
505 | |
506 | return ret; | |
1f5a7e47 JB |
507 | } |
508 | ||
5c0c3641 | 509 | void __ieee80211_key_free(struct ieee80211_key *key) |
1f5a7e47 | 510 | { |
5c0c3641 JB |
511 | if (!key) |
512 | return; | |
513 | ||
3b96766f JB |
514 | /* |
515 | * Replace key with nothingness if it was ever used. | |
516 | */ | |
3a245766 | 517 | if (key->sdata) |
3b96766f | 518 | __ieee80211_key_replace(key->sdata, key->sta, |
e31b8213 JB |
519 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, |
520 | key, NULL); | |
ad0e2b5a | 521 | __ieee80211_key_destroy(key); |
3b96766f | 522 | } |
d4e46a3d | 523 | |
32162a4d JM |
524 | void ieee80211_key_free(struct ieee80211_local *local, |
525 | struct ieee80211_key *key) | |
3b96766f | 526 | { |
ad0e2b5a | 527 | mutex_lock(&local->key_mtx); |
3a245766 | 528 | __ieee80211_key_free(key); |
ad0e2b5a | 529 | mutex_unlock(&local->key_mtx); |
3a245766 JB |
530 | } |
531 | ||
ad0e2b5a | 532 | void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata) |
3a245766 JB |
533 | { |
534 | struct ieee80211_key *key; | |
11a843b7 | 535 | |
3a245766 | 536 | ASSERT_RTNL(); |
11a843b7 | 537 | |
9607e6b6 | 538 | if (WARN_ON(!ieee80211_sdata_running(sdata))) |
3a245766 | 539 | return; |
11a843b7 | 540 | |
ad0e2b5a | 541 | mutex_lock(&sdata->local->key_mtx); |
11a843b7 | 542 | |
3bff1865 YAP |
543 | sdata->crypto_tx_tailroom_needed_cnt = 0; |
544 | ||
545 | list_for_each_entry(key, &sdata->key_list, list) { | |
546 | increment_tailroom_need_count(sdata); | |
ad0e2b5a | 547 | ieee80211_key_enable_hw_accel(key); |
3bff1865 | 548 | } |
3b96766f | 549 | |
ad0e2b5a | 550 | mutex_unlock(&sdata->local->key_mtx); |
11a843b7 JB |
551 | } |
552 | ||
830af02f JB |
553 | void ieee80211_iter_keys(struct ieee80211_hw *hw, |
554 | struct ieee80211_vif *vif, | |
555 | void (*iter)(struct ieee80211_hw *hw, | |
556 | struct ieee80211_vif *vif, | |
557 | struct ieee80211_sta *sta, | |
558 | struct ieee80211_key_conf *key, | |
559 | void *data), | |
560 | void *iter_data) | |
561 | { | |
562 | struct ieee80211_local *local = hw_to_local(hw); | |
563 | struct ieee80211_key *key; | |
564 | struct ieee80211_sub_if_data *sdata; | |
565 | ||
566 | ASSERT_RTNL(); | |
567 | ||
568 | mutex_lock(&local->key_mtx); | |
569 | if (vif) { | |
570 | sdata = vif_to_sdata(vif); | |
571 | list_for_each_entry(key, &sdata->key_list, list) | |
572 | iter(hw, &sdata->vif, | |
573 | key->sta ? &key->sta->sta : NULL, | |
574 | &key->conf, iter_data); | |
575 | } else { | |
576 | list_for_each_entry(sdata, &local->interfaces, list) | |
577 | list_for_each_entry(key, &sdata->key_list, list) | |
578 | iter(hw, &sdata->vif, | |
579 | key->sta ? &key->sta->sta : NULL, | |
580 | &key->conf, iter_data); | |
581 | } | |
582 | mutex_unlock(&local->key_mtx); | |
583 | } | |
584 | EXPORT_SYMBOL(ieee80211_iter_keys); | |
585 | ||
ad0e2b5a | 586 | void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata) |
11a843b7 JB |
587 | { |
588 | struct ieee80211_key *key; | |
589 | ||
ad0e2b5a | 590 | ASSERT_RTNL(); |
db4d1169 | 591 | |
ad0e2b5a | 592 | mutex_lock(&sdata->local->key_mtx); |
11a843b7 | 593 | |
ad0e2b5a JB |
594 | list_for_each_entry(key, &sdata->key_list, list) |
595 | ieee80211_key_disable_hw_accel(key); | |
11a843b7 | 596 | |
ad0e2b5a | 597 | mutex_unlock(&sdata->local->key_mtx); |
3b96766f | 598 | } |
11a843b7 | 599 | |
3b96766f JB |
600 | void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata) |
601 | { | |
602 | struct ieee80211_key *key, *tmp; | |
db4d1169 | 603 | |
ad0e2b5a | 604 | mutex_lock(&sdata->local->key_mtx); |
3b96766f | 605 | |
3cfcf6ac | 606 | ieee80211_debugfs_key_remove_mgmt_default(sdata); |
3b96766f JB |
607 | |
608 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) | |
3a245766 | 609 | __ieee80211_key_free(key); |
3b96766f | 610 | |
f7e0104c JB |
611 | ieee80211_debugfs_key_update_default(sdata); |
612 | ||
ad0e2b5a | 613 | mutex_unlock(&sdata->local->key_mtx); |
11a843b7 | 614 | } |
c68f4b89 JB |
615 | |
616 | ||
617 | void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid, | |
618 | const u8 *replay_ctr, gfp_t gfp) | |
619 | { | |
620 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
621 | ||
622 | trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr); | |
623 | ||
624 | cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp); | |
625 | } | |
626 | EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify); | |
3ea542d3 JB |
627 | |
628 | void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf, | |
629 | struct ieee80211_key_seq *seq) | |
630 | { | |
631 | struct ieee80211_key *key; | |
632 | u64 pn64; | |
633 | ||
634 | if (WARN_ON(!(keyconf->flags & IEEE80211_KEY_FLAG_GENERATE_IV))) | |
635 | return; | |
636 | ||
637 | key = container_of(keyconf, struct ieee80211_key, conf); | |
638 | ||
639 | switch (key->conf.cipher) { | |
640 | case WLAN_CIPHER_SUITE_TKIP: | |
641 | seq->tkip.iv32 = key->u.tkip.tx.iv32; | |
642 | seq->tkip.iv16 = key->u.tkip.tx.iv16; | |
643 | break; | |
644 | case WLAN_CIPHER_SUITE_CCMP: | |
645 | pn64 = atomic64_read(&key->u.ccmp.tx_pn); | |
646 | seq->ccmp.pn[5] = pn64; | |
647 | seq->ccmp.pn[4] = pn64 >> 8; | |
648 | seq->ccmp.pn[3] = pn64 >> 16; | |
649 | seq->ccmp.pn[2] = pn64 >> 24; | |
650 | seq->ccmp.pn[1] = pn64 >> 32; | |
651 | seq->ccmp.pn[0] = pn64 >> 40; | |
652 | break; | |
653 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
654 | pn64 = atomic64_read(&key->u.aes_cmac.tx_pn); | |
655 | seq->ccmp.pn[5] = pn64; | |
656 | seq->ccmp.pn[4] = pn64 >> 8; | |
657 | seq->ccmp.pn[3] = pn64 >> 16; | |
658 | seq->ccmp.pn[2] = pn64 >> 24; | |
659 | seq->ccmp.pn[1] = pn64 >> 32; | |
660 | seq->ccmp.pn[0] = pn64 >> 40; | |
661 | break; | |
662 | default: | |
663 | WARN_ON(1); | |
664 | } | |
665 | } | |
666 | EXPORT_SYMBOL(ieee80211_get_key_tx_seq); | |
667 | ||
668 | void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf, | |
669 | int tid, struct ieee80211_key_seq *seq) | |
670 | { | |
671 | struct ieee80211_key *key; | |
672 | const u8 *pn; | |
673 | ||
674 | key = container_of(keyconf, struct ieee80211_key, conf); | |
675 | ||
676 | switch (key->conf.cipher) { | |
677 | case WLAN_CIPHER_SUITE_TKIP: | |
678 | if (WARN_ON(tid < 0 || tid >= NUM_RX_DATA_QUEUES)) | |
679 | return; | |
680 | seq->tkip.iv32 = key->u.tkip.rx[tid].iv32; | |
681 | seq->tkip.iv16 = key->u.tkip.rx[tid].iv16; | |
682 | break; | |
683 | case WLAN_CIPHER_SUITE_CCMP: | |
684 | if (WARN_ON(tid < -1 || tid >= NUM_RX_DATA_QUEUES)) | |
685 | return; | |
686 | if (tid < 0) | |
687 | pn = key->u.ccmp.rx_pn[NUM_RX_DATA_QUEUES]; | |
688 | else | |
689 | pn = key->u.ccmp.rx_pn[tid]; | |
690 | memcpy(seq->ccmp.pn, pn, CCMP_PN_LEN); | |
691 | break; | |
692 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
693 | if (WARN_ON(tid != 0)) | |
694 | return; | |
695 | pn = key->u.aes_cmac.rx_pn; | |
696 | memcpy(seq->aes_cmac.pn, pn, CMAC_PN_LEN); | |
697 | break; | |
698 | } | |
699 | } | |
700 | EXPORT_SYMBOL(ieee80211_get_key_rx_seq); |