Commit | Line | Data |
---|---|---|
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 | 19 | #include <net/mac80211.h> |
d26ad377 | 20 | #include <asm/unaligned.h> |
1f5a7e47 | 21 | #include "ieee80211_i.h" |
24487981 | 22 | #include "driver-ops.h" |
1f5a7e47 JB |
23 | #include "debugfs_key.h" |
24 | #include "aes_ccm.h" | |
3cfcf6ac | 25 | #include "aes_cmac.h" |
1f5a7e47 | 26 | |
11a843b7 | 27 | |
dbbea671 JB |
28 | /** |
29 | * DOC: Key handling basics | |
11a843b7 JB |
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 | * | |
b5c34f66 JB |
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. | |
11a843b7 | 42 | * |
b5c34f66 JB |
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. | |
11a843b7 JB |
49 | */ |
50 | ||
51 | static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; | |
11a843b7 | 52 | |
ad0e2b5a | 53 | static void assert_key_lock(struct ieee80211_local *local) |
3b96766f | 54 | { |
46a5ebaf | 55 | lockdep_assert_held(&local->key_mtx); |
3b96766f JB |
56 | } |
57 | ||
3bff1865 YAP |
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 | ||
3ffc2a90 | 88 | static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key) |
11a843b7 | 89 | { |
dc822b5d | 90 | struct ieee80211_sub_if_data *sdata; |
89c91cae | 91 | struct sta_info *sta; |
11a843b7 JB |
92 | int ret; |
93 | ||
3b96766f JB |
94 | might_sleep(); |
95 | ||
e31b8213 | 96 | if (!key->local->ops->set_key) |
3ffc2a90 | 97 | goto out_unsupported; |
11a843b7 | 98 | |
ad0e2b5a JB |
99 | assert_key_lock(key->local); |
100 | ||
89c91cae | 101 | sta = key->sta; |
dc822b5d | 102 | |
e31b8213 JB |
103 | /* |
104 | * If this is a per-STA GTK, check if it | |
105 | * is supported; if not, return. | |
106 | */ | |
107 | if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) && | |
108 | !(key->local->hw.flags & IEEE80211_HW_SUPPORTS_PER_STA_GTK)) | |
109 | goto out_unsupported; | |
110 | ||
89c91cae JB |
111 | if (sta && !sta->uploaded) |
112 | goto out_unsupported; | |
113 | ||
dc822b5d | 114 | sdata = key->sdata; |
18890d4b HS |
115 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { |
116 | /* | |
117 | * The driver doesn't know anything about VLAN interfaces. | |
118 | * Hence, don't send GTKs for VLAN interfaces to the driver. | |
119 | */ | |
120 | if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) | |
121 | goto out_unsupported; | |
18890d4b | 122 | } |
11a843b7 | 123 | |
89c91cae JB |
124 | ret = drv_set_key(key->local, SET_KEY, sdata, |
125 | sta ? &sta->sta : NULL, &key->conf); | |
11a843b7 | 126 | |
e31b8213 | 127 | if (!ret) { |
11a843b7 | 128 | key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; |
3bff1865 YAP |
129 | |
130 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || | |
077a9154 AN |
131 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) || |
132 | (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))) | |
3bff1865 YAP |
133 | sdata->crypto_tx_tailroom_needed_cnt--; |
134 | ||
077a9154 AN |
135 | WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && |
136 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)); | |
137 | ||
e31b8213 JB |
138 | return 0; |
139 | } | |
11a843b7 | 140 | |
e31b8213 | 141 | if (ret != -ENOSPC && ret != -EOPNOTSUPP) |
bdcbd8e0 | 142 | sdata_err(sdata, |
0fb9a9ec | 143 | "failed to set key (%d, %pM) to hardware (%d)\n", |
89c91cae JB |
144 | key->conf.keyidx, |
145 | sta ? sta->sta.addr : bcast_addr, ret); | |
3ffc2a90 | 146 | |
e31b8213 JB |
147 | out_unsupported: |
148 | switch (key->conf.cipher) { | |
149 | case WLAN_CIPHER_SUITE_WEP40: | |
150 | case WLAN_CIPHER_SUITE_WEP104: | |
151 | case WLAN_CIPHER_SUITE_TKIP: | |
152 | case WLAN_CIPHER_SUITE_CCMP: | |
153 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
154 | /* all of these we can do in software */ | |
155 | return 0; | |
156 | default: | |
157 | return -EINVAL; | |
3ffc2a90 | 158 | } |
11a843b7 JB |
159 | } |
160 | ||
161 | static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key) | |
162 | { | |
dc822b5d | 163 | struct ieee80211_sub_if_data *sdata; |
89c91cae | 164 | struct sta_info *sta; |
11a843b7 JB |
165 | int ret; |
166 | ||
3b96766f JB |
167 | might_sleep(); |
168 | ||
db4d1169 | 169 | if (!key || !key->local->ops->set_key) |
11a843b7 JB |
170 | return; |
171 | ||
ad0e2b5a JB |
172 | assert_key_lock(key->local); |
173 | ||
174 | if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) | |
11a843b7 JB |
175 | return; |
176 | ||
89c91cae | 177 | sta = key->sta; |
dc822b5d JB |
178 | sdata = key->sdata; |
179 | ||
3bff1865 | 180 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
077a9154 AN |
181 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) || |
182 | (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))) | |
3bff1865 YAP |
183 | increment_tailroom_need_count(sdata); |
184 | ||
12375ef9 | 185 | ret = drv_set_key(key->local, DISABLE_KEY, sdata, |
89c91cae | 186 | sta ? &sta->sta : NULL, &key->conf); |
11a843b7 JB |
187 | |
188 | if (ret) | |
bdcbd8e0 | 189 | sdata_err(sdata, |
0fb9a9ec | 190 | "failed to remove key (%d, %pM) from hardware (%d)\n", |
89c91cae JB |
191 | key->conf.keyidx, |
192 | sta ? sta->sta.addr : bcast_addr, ret); | |
11a843b7 | 193 | |
3b96766f | 194 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; |
3b96766f JB |
195 | } |
196 | ||
e31b8213 JB |
197 | void ieee80211_key_removed(struct ieee80211_key_conf *key_conf) |
198 | { | |
199 | struct ieee80211_key *key; | |
200 | ||
201 | key = container_of(key_conf, struct ieee80211_key, conf); | |
202 | ||
203 | might_sleep(); | |
204 | assert_key_lock(key->local); | |
205 | ||
206 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; | |
207 | ||
208 | /* | |
209 | * Flush TX path to avoid attempts to use this key | |
210 | * after this function returns. Until then, drivers | |
211 | * must be prepared to handle the key. | |
212 | */ | |
213 | synchronize_rcu(); | |
214 | } | |
215 | EXPORT_SYMBOL_GPL(ieee80211_key_removed); | |
216 | ||
3b96766f | 217 | static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, |
f7e0104c | 218 | int idx, bool uni, bool multi) |
3b96766f JB |
219 | { |
220 | struct ieee80211_key *key = NULL; | |
221 | ||
ad0e2b5a JB |
222 | assert_key_lock(sdata->local); |
223 | ||
3b96766f | 224 | if (idx >= 0 && idx < NUM_DEFAULT_KEYS) |
40b275b6 | 225 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
3b96766f | 226 | |
f7e0104c JB |
227 | if (uni) |
228 | rcu_assign_pointer(sdata->default_unicast_key, key); | |
229 | if (multi) | |
230 | rcu_assign_pointer(sdata->default_multicast_key, key); | |
3b96766f | 231 | |
f7e0104c | 232 | ieee80211_debugfs_key_update_default(sdata); |
3b96766f JB |
233 | } |
234 | ||
f7e0104c JB |
235 | void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx, |
236 | bool uni, bool multi) | |
3b96766f | 237 | { |
ad0e2b5a | 238 | mutex_lock(&sdata->local->key_mtx); |
f7e0104c | 239 | __ieee80211_set_default_key(sdata, idx, uni, multi); |
ad0e2b5a | 240 | mutex_unlock(&sdata->local->key_mtx); |
3b96766f JB |
241 | } |
242 | ||
3cfcf6ac JM |
243 | static void |
244 | __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx) | |
245 | { | |
246 | struct ieee80211_key *key = NULL; | |
247 | ||
ad0e2b5a JB |
248 | assert_key_lock(sdata->local); |
249 | ||
3cfcf6ac JM |
250 | if (idx >= NUM_DEFAULT_KEYS && |
251 | idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
40b275b6 | 252 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
3cfcf6ac JM |
253 | |
254 | rcu_assign_pointer(sdata->default_mgmt_key, key); | |
255 | ||
f7e0104c | 256 | ieee80211_debugfs_key_update_default(sdata); |
3cfcf6ac JM |
257 | } |
258 | ||
259 | void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, | |
260 | int idx) | |
261 | { | |
ad0e2b5a | 262 | mutex_lock(&sdata->local->key_mtx); |
3cfcf6ac | 263 | __ieee80211_set_default_mgmt_key(sdata, idx); |
ad0e2b5a | 264 | mutex_unlock(&sdata->local->key_mtx); |
3cfcf6ac JM |
265 | } |
266 | ||
3b96766f JB |
267 | |
268 | static void __ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, | |
269 | struct sta_info *sta, | |
e31b8213 | 270 | bool pairwise, |
3b96766f JB |
271 | struct ieee80211_key *old, |
272 | struct ieee80211_key *new) | |
273 | { | |
f7e0104c JB |
274 | int idx; |
275 | bool defunikey, defmultikey, defmgmtkey; | |
3b96766f JB |
276 | |
277 | if (new) | |
f850e00f | 278 | list_add_tail(&new->list, &sdata->key_list); |
3b96766f | 279 | |
e31b8213 JB |
280 | if (sta && pairwise) { |
281 | rcu_assign_pointer(sta->ptk, new); | |
282 | } else if (sta) { | |
283 | if (old) | |
284 | idx = old->conf.keyidx; | |
285 | else | |
286 | idx = new->conf.keyidx; | |
287 | rcu_assign_pointer(sta->gtk[idx], new); | |
3b96766f JB |
288 | } else { |
289 | WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx); | |
290 | ||
291 | if (old) | |
292 | idx = old->conf.keyidx; | |
293 | else | |
294 | idx = new->conf.keyidx; | |
295 | ||
40b275b6 JB |
296 | defunikey = old && |
297 | old == key_mtx_dereference(sdata->local, | |
298 | sdata->default_unicast_key); | |
299 | defmultikey = old && | |
300 | old == key_mtx_dereference(sdata->local, | |
301 | sdata->default_multicast_key); | |
302 | defmgmtkey = old && | |
303 | old == key_mtx_dereference(sdata->local, | |
304 | sdata->default_mgmt_key); | |
3b96766f | 305 | |
f7e0104c JB |
306 | if (defunikey && !new) |
307 | __ieee80211_set_default_key(sdata, -1, true, false); | |
308 | if (defmultikey && !new) | |
309 | __ieee80211_set_default_key(sdata, -1, false, true); | |
3cfcf6ac JM |
310 | if (defmgmtkey && !new) |
311 | __ieee80211_set_default_mgmt_key(sdata, -1); | |
3b96766f JB |
312 | |
313 | rcu_assign_pointer(sdata->keys[idx], new); | |
f7e0104c JB |
314 | if (defunikey && new) |
315 | __ieee80211_set_default_key(sdata, new->conf.keyidx, | |
316 | true, false); | |
317 | if (defmultikey && new) | |
318 | __ieee80211_set_default_key(sdata, new->conf.keyidx, | |
319 | false, true); | |
3cfcf6ac JM |
320 | if (defmgmtkey && new) |
321 | __ieee80211_set_default_mgmt_key(sdata, | |
322 | new->conf.keyidx); | |
3b96766f JB |
323 | } |
324 | ||
b5c34f66 JB |
325 | if (old) |
326 | list_del(&old->list); | |
11a843b7 JB |
327 | } |
328 | ||
97359d12 | 329 | struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, |
faa8fdc8 JM |
330 | const u8 *key_data, |
331 | size_t seq_len, const u8 *seq) | |
1f5a7e47 JB |
332 | { |
333 | struct ieee80211_key *key; | |
1ac62ba7 | 334 | int i, j, err; |
1f5a7e47 | 335 | |
3cfcf6ac | 336 | BUG_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS); |
11a843b7 JB |
337 | |
338 | key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); | |
1f5a7e47 | 339 | if (!key) |
1ac62ba7 | 340 | return ERR_PTR(-ENOMEM); |
11a843b7 JB |
341 | |
342 | /* | |
343 | * Default to software encryption; we'll later upload the | |
344 | * key to the hardware if possible. | |
345 | */ | |
11a843b7 JB |
346 | key->conf.flags = 0; |
347 | key->flags = 0; | |
348 | ||
97359d12 | 349 | key->conf.cipher = cipher; |
11a843b7 JB |
350 | key->conf.keyidx = idx; |
351 | key->conf.keylen = key_len; | |
97359d12 JB |
352 | switch (cipher) { |
353 | case WLAN_CIPHER_SUITE_WEP40: | |
354 | case WLAN_CIPHER_SUITE_WEP104: | |
76708dee FF |
355 | key->conf.iv_len = WEP_IV_LEN; |
356 | key->conf.icv_len = WEP_ICV_LEN; | |
357 | break; | |
97359d12 | 358 | case WLAN_CIPHER_SUITE_TKIP: |
76708dee FF |
359 | key->conf.iv_len = TKIP_IV_LEN; |
360 | key->conf.icv_len = TKIP_ICV_LEN; | |
9f26a952 | 361 | if (seq) { |
faa8fdc8 JM |
362 | for (i = 0; i < NUM_RX_DATA_QUEUES; i++) { |
363 | key->u.tkip.rx[i].iv32 = | |
364 | get_unaligned_le32(&seq[2]); | |
365 | key->u.tkip.rx[i].iv16 = | |
366 | get_unaligned_le16(seq); | |
367 | } | |
368 | } | |
523b02ea | 369 | spin_lock_init(&key->u.tkip.txlock); |
76708dee | 370 | break; |
97359d12 | 371 | case WLAN_CIPHER_SUITE_CCMP: |
76708dee FF |
372 | key->conf.iv_len = CCMP_HDR_LEN; |
373 | key->conf.icv_len = CCMP_MIC_LEN; | |
9f26a952 | 374 | if (seq) { |
9190252c | 375 | for (i = 0; i < NUM_RX_DATA_QUEUES + 1; i++) |
faa8fdc8 JM |
376 | for (j = 0; j < CCMP_PN_LEN; j++) |
377 | key->u.ccmp.rx_pn[i][j] = | |
378 | seq[CCMP_PN_LEN - j - 1]; | |
379 | } | |
11a843b7 JB |
380 | /* |
381 | * Initialize AES key state here as an optimization so that | |
382 | * it does not need to be initialized for every packet. | |
383 | */ | |
384 | key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(key_data); | |
1ac62ba7 BH |
385 | if (IS_ERR(key->u.ccmp.tfm)) { |
386 | err = PTR_ERR(key->u.ccmp.tfm); | |
3b96766f | 387 | kfree(key); |
1f951a7f | 388 | return ERR_PTR(err); |
11a843b7 | 389 | } |
60ae0f20 JB |
390 | break; |
391 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
392 | key->conf.iv_len = 0; | |
393 | key->conf.icv_len = sizeof(struct ieee80211_mmie); | |
394 | if (seq) | |
395 | for (j = 0; j < 6; j++) | |
396 | key->u.aes_cmac.rx_pn[j] = seq[6 - j - 1]; | |
3cfcf6ac JM |
397 | /* |
398 | * Initialize AES key state here as an optimization so that | |
399 | * it does not need to be initialized for every packet. | |
400 | */ | |
401 | key->u.aes_cmac.tfm = | |
402 | ieee80211_aes_cmac_key_setup(key_data); | |
1ac62ba7 BH |
403 | if (IS_ERR(key->u.aes_cmac.tfm)) { |
404 | err = PTR_ERR(key->u.aes_cmac.tfm); | |
3cfcf6ac | 405 | kfree(key); |
1f951a7f | 406 | return ERR_PTR(err); |
3cfcf6ac | 407 | } |
60ae0f20 | 408 | break; |
3cfcf6ac | 409 | } |
60ae0f20 JB |
410 | memcpy(key->conf.key, key_data, key_len); |
411 | INIT_LIST_HEAD(&key->list); | |
3cfcf6ac | 412 | |
db4d1169 JB |
413 | return key; |
414 | } | |
11a843b7 | 415 | |
ad0e2b5a JB |
416 | static void __ieee80211_key_destroy(struct ieee80211_key *key) |
417 | { | |
418 | if (!key) | |
419 | return; | |
420 | ||
d2460f4b JB |
421 | /* |
422 | * Synchronize so the TX path can no longer be using | |
423 | * this key before we free/remove it. | |
424 | */ | |
425 | synchronize_rcu(); | |
426 | ||
32162a4d JM |
427 | if (key->local) |
428 | ieee80211_key_disable_hw_accel(key); | |
ad0e2b5a | 429 | |
97359d12 | 430 | if (key->conf.cipher == WLAN_CIPHER_SUITE_CCMP) |
ad0e2b5a | 431 | ieee80211_aes_key_free(key->u.ccmp.tfm); |
97359d12 | 432 | if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC) |
ad0e2b5a | 433 | ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); |
3bff1865 | 434 | if (key->local) { |
32162a4d | 435 | ieee80211_debugfs_key_remove(key); |
3bff1865 YAP |
436 | key->sdata->crypto_tx_tailroom_needed_cnt--; |
437 | } | |
ad0e2b5a JB |
438 | |
439 | kfree(key); | |
440 | } | |
441 | ||
3ffc2a90 JB |
442 | int ieee80211_key_link(struct ieee80211_key *key, |
443 | struct ieee80211_sub_if_data *sdata, | |
444 | struct sta_info *sta) | |
db4d1169 JB |
445 | { |
446 | struct ieee80211_key *old_key; | |
3ffc2a90 | 447 | int idx, ret; |
67aa030c | 448 | bool pairwise; |
db4d1169 | 449 | |
db4d1169 JB |
450 | BUG_ON(!sdata); |
451 | BUG_ON(!key); | |
452 | ||
67aa030c | 453 | pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE; |
db4d1169 JB |
454 | idx = key->conf.keyidx; |
455 | key->local = sdata->local; | |
456 | key->sdata = sdata; | |
457 | key->sta = sta; | |
458 | ||
11a843b7 | 459 | if (sta) { |
11a843b7 JB |
460 | /* |
461 | * some hardware cannot handle TKIP with QoS, so | |
462 | * we indicate whether QoS could be in use. | |
463 | */ | |
c2c98fde | 464 | if (test_sta_flag(sta, WLAN_STA_WME)) |
11a843b7 JB |
465 | key->conf.flags |= IEEE80211_KEY_FLAG_WMM_STA; |
466 | } else { | |
05c914fe | 467 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { |
11a843b7 JB |
468 | struct sta_info *ap; |
469 | ||
3b96766f | 470 | /* |
b5c34f66 JB |
471 | * We're getting a sta pointer in, so must be under |
472 | * appropriate locking for sta_info_get(). | |
3b96766f | 473 | */ |
d0709a65 | 474 | |
11a843b7 | 475 | /* same here, the AP could be using QoS */ |
abe60632 | 476 | ap = sta_info_get(key->sdata, key->sdata->u.mgd.bssid); |
11a843b7 | 477 | if (ap) { |
c2c98fde | 478 | if (test_sta_flag(ap, WLAN_STA_WME)) |
11a843b7 JB |
479 | key->conf.flags |= |
480 | IEEE80211_KEY_FLAG_WMM_STA; | |
11a843b7 JB |
481 | } |
482 | } | |
11a843b7 JB |
483 | } |
484 | ||
ad0e2b5a | 485 | mutex_lock(&sdata->local->key_mtx); |
3b96766f | 486 | |
e31b8213 | 487 | if (sta && pairwise) |
40b275b6 | 488 | old_key = key_mtx_dereference(sdata->local, sta->ptk); |
e31b8213 | 489 | else if (sta) |
40b275b6 | 490 | old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]); |
d4e46a3d | 491 | else |
40b275b6 | 492 | old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
db4d1169 | 493 | |
3bff1865 YAP |
494 | increment_tailroom_need_count(sdata); |
495 | ||
e31b8213 | 496 | __ieee80211_key_replace(sdata, sta, pairwise, old_key, key); |
ad0e2b5a | 497 | __ieee80211_key_destroy(old_key); |
d4e46a3d | 498 | |
ad0e2b5a | 499 | ieee80211_debugfs_key_add(key); |
db4d1169 | 500 | |
3ffc2a90 | 501 | ret = ieee80211_key_enable_hw_accel(key); |
523d2f69 | 502 | |
ad0e2b5a | 503 | mutex_unlock(&sdata->local->key_mtx); |
3ffc2a90 JB |
504 | |
505 | return ret; | |
1f5a7e47 JB |
506 | } |
507 | ||
5c0c3641 | 508 | void __ieee80211_key_free(struct ieee80211_key *key) |
1f5a7e47 | 509 | { |
5c0c3641 JB |
510 | if (!key) |
511 | return; | |
512 | ||
3b96766f JB |
513 | /* |
514 | * Replace key with nothingness if it was ever used. | |
515 | */ | |
3a245766 | 516 | if (key->sdata) |
3b96766f | 517 | __ieee80211_key_replace(key->sdata, key->sta, |
e31b8213 JB |
518 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, |
519 | key, NULL); | |
ad0e2b5a | 520 | __ieee80211_key_destroy(key); |
3b96766f | 521 | } |
d4e46a3d | 522 | |
32162a4d JM |
523 | void ieee80211_key_free(struct ieee80211_local *local, |
524 | struct ieee80211_key *key) | |
3b96766f | 525 | { |
ad0e2b5a | 526 | mutex_lock(&local->key_mtx); |
3a245766 | 527 | __ieee80211_key_free(key); |
ad0e2b5a | 528 | mutex_unlock(&local->key_mtx); |
3a245766 JB |
529 | } |
530 | ||
ad0e2b5a | 531 | void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata) |
3a245766 JB |
532 | { |
533 | struct ieee80211_key *key; | |
11a843b7 | 534 | |
3a245766 | 535 | ASSERT_RTNL(); |
11a843b7 | 536 | |
9607e6b6 | 537 | if (WARN_ON(!ieee80211_sdata_running(sdata))) |
3a245766 | 538 | return; |
11a843b7 | 539 | |
ad0e2b5a | 540 | mutex_lock(&sdata->local->key_mtx); |
11a843b7 | 541 | |
3bff1865 YAP |
542 | sdata->crypto_tx_tailroom_needed_cnt = 0; |
543 | ||
544 | list_for_each_entry(key, &sdata->key_list, list) { | |
545 | increment_tailroom_need_count(sdata); | |
ad0e2b5a | 546 | ieee80211_key_enable_hw_accel(key); |
3bff1865 | 547 | } |
3b96766f | 548 | |
ad0e2b5a | 549 | mutex_unlock(&sdata->local->key_mtx); |
11a843b7 JB |
550 | } |
551 | ||
830af02f JB |
552 | void ieee80211_iter_keys(struct ieee80211_hw *hw, |
553 | struct ieee80211_vif *vif, | |
554 | void (*iter)(struct ieee80211_hw *hw, | |
555 | struct ieee80211_vif *vif, | |
556 | struct ieee80211_sta *sta, | |
557 | struct ieee80211_key_conf *key, | |
558 | void *data), | |
559 | void *iter_data) | |
560 | { | |
561 | struct ieee80211_local *local = hw_to_local(hw); | |
562 | struct ieee80211_key *key; | |
563 | struct ieee80211_sub_if_data *sdata; | |
564 | ||
565 | ASSERT_RTNL(); | |
566 | ||
567 | mutex_lock(&local->key_mtx); | |
568 | if (vif) { | |
569 | sdata = vif_to_sdata(vif); | |
570 | list_for_each_entry(key, &sdata->key_list, list) | |
571 | iter(hw, &sdata->vif, | |
572 | key->sta ? &key->sta->sta : NULL, | |
573 | &key->conf, iter_data); | |
574 | } else { | |
575 | list_for_each_entry(sdata, &local->interfaces, list) | |
576 | list_for_each_entry(key, &sdata->key_list, list) | |
577 | iter(hw, &sdata->vif, | |
578 | key->sta ? &key->sta->sta : NULL, | |
579 | &key->conf, iter_data); | |
580 | } | |
581 | mutex_unlock(&local->key_mtx); | |
582 | } | |
583 | EXPORT_SYMBOL(ieee80211_iter_keys); | |
584 | ||
ad0e2b5a | 585 | void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata) |
11a843b7 JB |
586 | { |
587 | struct ieee80211_key *key; | |
588 | ||
ad0e2b5a | 589 | ASSERT_RTNL(); |
db4d1169 | 590 | |
ad0e2b5a | 591 | mutex_lock(&sdata->local->key_mtx); |
11a843b7 | 592 | |
ad0e2b5a JB |
593 | list_for_each_entry(key, &sdata->key_list, list) |
594 | ieee80211_key_disable_hw_accel(key); | |
11a843b7 | 595 | |
ad0e2b5a | 596 | mutex_unlock(&sdata->local->key_mtx); |
3b96766f | 597 | } |
11a843b7 | 598 | |
3b96766f JB |
599 | void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata) |
600 | { | |
601 | struct ieee80211_key *key, *tmp; | |
db4d1169 | 602 | |
ad0e2b5a | 603 | mutex_lock(&sdata->local->key_mtx); |
3b96766f | 604 | |
3cfcf6ac | 605 | ieee80211_debugfs_key_remove_mgmt_default(sdata); |
3b96766f JB |
606 | |
607 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) | |
3a245766 | 608 | __ieee80211_key_free(key); |
3b96766f | 609 | |
f7e0104c JB |
610 | ieee80211_debugfs_key_update_default(sdata); |
611 | ||
ad0e2b5a | 612 | mutex_unlock(&sdata->local->key_mtx); |
11a843b7 | 613 | } |
c68f4b89 JB |
614 | |
615 | ||
616 | void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid, | |
617 | const u8 *replay_ctr, gfp_t gfp) | |
618 | { | |
619 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
620 | ||
621 | trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr); | |
622 | ||
623 | cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp); | |
624 | } | |
625 | EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify); | |
3ea542d3 JB |
626 | |
627 | void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf, | |
628 | struct ieee80211_key_seq *seq) | |
629 | { | |
630 | struct ieee80211_key *key; | |
631 | u64 pn64; | |
632 | ||
633 | if (WARN_ON(!(keyconf->flags & IEEE80211_KEY_FLAG_GENERATE_IV))) | |
634 | return; | |
635 | ||
636 | key = container_of(keyconf, struct ieee80211_key, conf); | |
637 | ||
638 | switch (key->conf.cipher) { | |
639 | case WLAN_CIPHER_SUITE_TKIP: | |
640 | seq->tkip.iv32 = key->u.tkip.tx.iv32; | |
641 | seq->tkip.iv16 = key->u.tkip.tx.iv16; | |
642 | break; | |
643 | case WLAN_CIPHER_SUITE_CCMP: | |
644 | pn64 = atomic64_read(&key->u.ccmp.tx_pn); | |
645 | seq->ccmp.pn[5] = pn64; | |
646 | seq->ccmp.pn[4] = pn64 >> 8; | |
647 | seq->ccmp.pn[3] = pn64 >> 16; | |
648 | seq->ccmp.pn[2] = pn64 >> 24; | |
649 | seq->ccmp.pn[1] = pn64 >> 32; | |
650 | seq->ccmp.pn[0] = pn64 >> 40; | |
651 | break; | |
652 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
653 | pn64 = atomic64_read(&key->u.aes_cmac.tx_pn); | |
654 | seq->ccmp.pn[5] = pn64; | |
655 | seq->ccmp.pn[4] = pn64 >> 8; | |
656 | seq->ccmp.pn[3] = pn64 >> 16; | |
657 | seq->ccmp.pn[2] = pn64 >> 24; | |
658 | seq->ccmp.pn[1] = pn64 >> 32; | |
659 | seq->ccmp.pn[0] = pn64 >> 40; | |
660 | break; | |
661 | default: | |
662 | WARN_ON(1); | |
663 | } | |
664 | } | |
665 | EXPORT_SYMBOL(ieee80211_get_key_tx_seq); | |
666 | ||
667 | void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf, | |
668 | int tid, struct ieee80211_key_seq *seq) | |
669 | { | |
670 | struct ieee80211_key *key; | |
671 | const u8 *pn; | |
672 | ||
673 | key = container_of(keyconf, struct ieee80211_key, conf); | |
674 | ||
675 | switch (key->conf.cipher) { | |
676 | case WLAN_CIPHER_SUITE_TKIP: | |
677 | if (WARN_ON(tid < 0 || tid >= NUM_RX_DATA_QUEUES)) | |
678 | return; | |
679 | seq->tkip.iv32 = key->u.tkip.rx[tid].iv32; | |
680 | seq->tkip.iv16 = key->u.tkip.rx[tid].iv16; | |
681 | break; | |
682 | case WLAN_CIPHER_SUITE_CCMP: | |
683 | if (WARN_ON(tid < -1 || tid >= NUM_RX_DATA_QUEUES)) | |
684 | return; | |
685 | if (tid < 0) | |
686 | pn = key->u.ccmp.rx_pn[NUM_RX_DATA_QUEUES]; | |
687 | else | |
688 | pn = key->u.ccmp.rx_pn[tid]; | |
689 | memcpy(seq->ccmp.pn, pn, CCMP_PN_LEN); | |
690 | break; | |
691 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
692 | if (WARN_ON(tid != 0)) | |
693 | return; | |
694 | pn = key->u.aes_cmac.rx_pn; | |
695 | memcpy(seq->aes_cmac.pn, pn, CMAC_PN_LEN); | |
696 | break; | |
697 | } | |
698 | } | |
699 | EXPORT_SYMBOL(ieee80211_get_key_rx_seq); |