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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; | |
dc822b5d JB |
126 | sdata = container_of(sdata->bss, |
127 | struct ieee80211_sub_if_data, | |
128 | u.ap); | |
18890d4b | 129 | } |
11a843b7 | 130 | |
12375ef9 | 131 | ret = drv_set_key(key->local, SET_KEY, sdata, sta, &key->conf); |
11a843b7 | 132 | |
e31b8213 | 133 | if (!ret) { |
11a843b7 | 134 | key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; |
3bff1865 YAP |
135 | |
136 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || | |
137 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))) | |
138 | sdata->crypto_tx_tailroom_needed_cnt--; | |
139 | ||
e31b8213 JB |
140 | return 0; |
141 | } | |
11a843b7 | 142 | |
e31b8213 | 143 | if (ret != -ENOSPC && ret != -EOPNOTSUPP) |
0fb9a9ec JP |
144 | wiphy_err(key->local->hw.wiphy, |
145 | "failed to set key (%d, %pM) to hardware (%d)\n", | |
146 | key->conf.keyidx, sta ? sta->addr : bcast_addr, ret); | |
3ffc2a90 | 147 | |
e31b8213 JB |
148 | out_unsupported: |
149 | switch (key->conf.cipher) { | |
150 | case WLAN_CIPHER_SUITE_WEP40: | |
151 | case WLAN_CIPHER_SUITE_WEP104: | |
152 | case WLAN_CIPHER_SUITE_TKIP: | |
153 | case WLAN_CIPHER_SUITE_CCMP: | |
154 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
155 | /* all of these we can do in software */ | |
156 | return 0; | |
157 | default: | |
158 | return -EINVAL; | |
3ffc2a90 | 159 | } |
11a843b7 JB |
160 | } |
161 | ||
162 | static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key) | |
163 | { | |
dc822b5d JB |
164 | struct ieee80211_sub_if_data *sdata; |
165 | struct ieee80211_sta *sta; | |
11a843b7 JB |
166 | int ret; |
167 | ||
3b96766f JB |
168 | might_sleep(); |
169 | ||
db4d1169 | 170 | if (!key || !key->local->ops->set_key) |
11a843b7 JB |
171 | return; |
172 | ||
ad0e2b5a JB |
173 | assert_key_lock(key->local); |
174 | ||
175 | if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) | |
11a843b7 JB |
176 | return; |
177 | ||
dc822b5d JB |
178 | sta = get_sta_for_key(key); |
179 | sdata = key->sdata; | |
180 | ||
3bff1865 YAP |
181 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
182 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))) | |
183 | increment_tailroom_need_count(sdata); | |
184 | ||
dc822b5d JB |
185 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) |
186 | sdata = container_of(sdata->bss, | |
187 | struct ieee80211_sub_if_data, | |
188 | u.ap); | |
11a843b7 | 189 | |
12375ef9 | 190 | ret = drv_set_key(key->local, DISABLE_KEY, sdata, |
24487981 | 191 | sta, &key->conf); |
11a843b7 JB |
192 | |
193 | if (ret) | |
0fb9a9ec JP |
194 | wiphy_err(key->local->hw.wiphy, |
195 | "failed to remove key (%d, %pM) from hardware (%d)\n", | |
196 | key->conf.keyidx, sta ? sta->addr : bcast_addr, ret); | |
11a843b7 | 197 | |
3b96766f | 198 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; |
3b96766f JB |
199 | } |
200 | ||
e31b8213 JB |
201 | void ieee80211_key_removed(struct ieee80211_key_conf *key_conf) |
202 | { | |
203 | struct ieee80211_key *key; | |
204 | ||
205 | key = container_of(key_conf, struct ieee80211_key, conf); | |
206 | ||
207 | might_sleep(); | |
208 | assert_key_lock(key->local); | |
209 | ||
210 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; | |
211 | ||
212 | /* | |
213 | * Flush TX path to avoid attempts to use this key | |
214 | * after this function returns. Until then, drivers | |
215 | * must be prepared to handle the key. | |
216 | */ | |
217 | synchronize_rcu(); | |
218 | } | |
219 | EXPORT_SYMBOL_GPL(ieee80211_key_removed); | |
220 | ||
3b96766f | 221 | static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, |
f7e0104c | 222 | int idx, bool uni, bool multi) |
3b96766f JB |
223 | { |
224 | struct ieee80211_key *key = NULL; | |
225 | ||
ad0e2b5a JB |
226 | assert_key_lock(sdata->local); |
227 | ||
3b96766f | 228 | if (idx >= 0 && idx < NUM_DEFAULT_KEYS) |
40b275b6 | 229 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
3b96766f | 230 | |
f7e0104c JB |
231 | if (uni) |
232 | rcu_assign_pointer(sdata->default_unicast_key, key); | |
233 | if (multi) | |
234 | rcu_assign_pointer(sdata->default_multicast_key, key); | |
3b96766f | 235 | |
f7e0104c | 236 | ieee80211_debugfs_key_update_default(sdata); |
3b96766f JB |
237 | } |
238 | ||
f7e0104c JB |
239 | void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx, |
240 | bool uni, bool multi) | |
3b96766f | 241 | { |
ad0e2b5a | 242 | mutex_lock(&sdata->local->key_mtx); |
f7e0104c | 243 | __ieee80211_set_default_key(sdata, idx, uni, multi); |
ad0e2b5a | 244 | mutex_unlock(&sdata->local->key_mtx); |
3b96766f JB |
245 | } |
246 | ||
3cfcf6ac JM |
247 | static void |
248 | __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx) | |
249 | { | |
250 | struct ieee80211_key *key = NULL; | |
251 | ||
ad0e2b5a JB |
252 | assert_key_lock(sdata->local); |
253 | ||
3cfcf6ac JM |
254 | if (idx >= NUM_DEFAULT_KEYS && |
255 | idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
40b275b6 | 256 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
3cfcf6ac JM |
257 | |
258 | rcu_assign_pointer(sdata->default_mgmt_key, key); | |
259 | ||
f7e0104c | 260 | ieee80211_debugfs_key_update_default(sdata); |
3cfcf6ac JM |
261 | } |
262 | ||
263 | void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, | |
264 | int idx) | |
265 | { | |
ad0e2b5a | 266 | mutex_lock(&sdata->local->key_mtx); |
3cfcf6ac | 267 | __ieee80211_set_default_mgmt_key(sdata, idx); |
ad0e2b5a | 268 | mutex_unlock(&sdata->local->key_mtx); |
3cfcf6ac JM |
269 | } |
270 | ||
3b96766f JB |
271 | |
272 | static void __ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, | |
273 | struct sta_info *sta, | |
e31b8213 | 274 | bool pairwise, |
3b96766f JB |
275 | struct ieee80211_key *old, |
276 | struct ieee80211_key *new) | |
277 | { | |
f7e0104c JB |
278 | int idx; |
279 | bool defunikey, defmultikey, defmgmtkey; | |
3b96766f JB |
280 | |
281 | if (new) | |
f850e00f | 282 | list_add_tail(&new->list, &sdata->key_list); |
3b96766f | 283 | |
e31b8213 JB |
284 | if (sta && pairwise) { |
285 | rcu_assign_pointer(sta->ptk, new); | |
286 | } else if (sta) { | |
287 | if (old) | |
288 | idx = old->conf.keyidx; | |
289 | else | |
290 | idx = new->conf.keyidx; | |
291 | rcu_assign_pointer(sta->gtk[idx], new); | |
3b96766f JB |
292 | } else { |
293 | WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx); | |
294 | ||
295 | if (old) | |
296 | idx = old->conf.keyidx; | |
297 | else | |
298 | idx = new->conf.keyidx; | |
299 | ||
40b275b6 JB |
300 | defunikey = old && |
301 | old == key_mtx_dereference(sdata->local, | |
302 | sdata->default_unicast_key); | |
303 | defmultikey = old && | |
304 | old == key_mtx_dereference(sdata->local, | |
305 | sdata->default_multicast_key); | |
306 | defmgmtkey = old && | |
307 | old == key_mtx_dereference(sdata->local, | |
308 | sdata->default_mgmt_key); | |
3b96766f | 309 | |
f7e0104c JB |
310 | if (defunikey && !new) |
311 | __ieee80211_set_default_key(sdata, -1, true, false); | |
312 | if (defmultikey && !new) | |
313 | __ieee80211_set_default_key(sdata, -1, false, true); | |
3cfcf6ac JM |
314 | if (defmgmtkey && !new) |
315 | __ieee80211_set_default_mgmt_key(sdata, -1); | |
3b96766f JB |
316 | |
317 | rcu_assign_pointer(sdata->keys[idx], new); | |
f7e0104c JB |
318 | if (defunikey && new) |
319 | __ieee80211_set_default_key(sdata, new->conf.keyidx, | |
320 | true, false); | |
321 | if (defmultikey && new) | |
322 | __ieee80211_set_default_key(sdata, new->conf.keyidx, | |
323 | false, true); | |
3cfcf6ac JM |
324 | if (defmgmtkey && new) |
325 | __ieee80211_set_default_mgmt_key(sdata, | |
326 | new->conf.keyidx); | |
3b96766f JB |
327 | } |
328 | ||
b5c34f66 JB |
329 | if (old) |
330 | list_del(&old->list); | |
11a843b7 JB |
331 | } |
332 | ||
97359d12 | 333 | struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, |
faa8fdc8 JM |
334 | const u8 *key_data, |
335 | size_t seq_len, const u8 *seq) | |
1f5a7e47 JB |
336 | { |
337 | struct ieee80211_key *key; | |
1ac62ba7 | 338 | int i, j, err; |
1f5a7e47 | 339 | |
3cfcf6ac | 340 | BUG_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS); |
11a843b7 JB |
341 | |
342 | key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); | |
1f5a7e47 | 343 | if (!key) |
1ac62ba7 | 344 | return ERR_PTR(-ENOMEM); |
11a843b7 JB |
345 | |
346 | /* | |
347 | * Default to software encryption; we'll later upload the | |
348 | * key to the hardware if possible. | |
349 | */ | |
11a843b7 JB |
350 | key->conf.flags = 0; |
351 | key->flags = 0; | |
352 | ||
97359d12 | 353 | key->conf.cipher = cipher; |
11a843b7 JB |
354 | key->conf.keyidx = idx; |
355 | key->conf.keylen = key_len; | |
97359d12 JB |
356 | switch (cipher) { |
357 | case WLAN_CIPHER_SUITE_WEP40: | |
358 | case WLAN_CIPHER_SUITE_WEP104: | |
76708dee FF |
359 | key->conf.iv_len = WEP_IV_LEN; |
360 | key->conf.icv_len = WEP_ICV_LEN; | |
361 | break; | |
97359d12 | 362 | case WLAN_CIPHER_SUITE_TKIP: |
76708dee FF |
363 | key->conf.iv_len = TKIP_IV_LEN; |
364 | key->conf.icv_len = TKIP_ICV_LEN; | |
9f26a952 | 365 | if (seq) { |
faa8fdc8 JM |
366 | for (i = 0; i < NUM_RX_DATA_QUEUES; i++) { |
367 | key->u.tkip.rx[i].iv32 = | |
368 | get_unaligned_le32(&seq[2]); | |
369 | key->u.tkip.rx[i].iv16 = | |
370 | get_unaligned_le16(seq); | |
371 | } | |
372 | } | |
523b02ea | 373 | spin_lock_init(&key->u.tkip.txlock); |
76708dee | 374 | break; |
97359d12 | 375 | case WLAN_CIPHER_SUITE_CCMP: |
76708dee FF |
376 | key->conf.iv_len = CCMP_HDR_LEN; |
377 | key->conf.icv_len = CCMP_MIC_LEN; | |
9f26a952 | 378 | if (seq) { |
9190252c | 379 | for (i = 0; i < NUM_RX_DATA_QUEUES + 1; i++) |
faa8fdc8 JM |
380 | for (j = 0; j < CCMP_PN_LEN; j++) |
381 | key->u.ccmp.rx_pn[i][j] = | |
382 | seq[CCMP_PN_LEN - j - 1]; | |
383 | } | |
11a843b7 JB |
384 | /* |
385 | * Initialize AES key state here as an optimization so that | |
386 | * it does not need to be initialized for every packet. | |
387 | */ | |
388 | key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(key_data); | |
1ac62ba7 BH |
389 | if (IS_ERR(key->u.ccmp.tfm)) { |
390 | err = PTR_ERR(key->u.ccmp.tfm); | |
3b96766f | 391 | kfree(key); |
1f951a7f | 392 | return ERR_PTR(err); |
11a843b7 | 393 | } |
60ae0f20 JB |
394 | break; |
395 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
396 | key->conf.iv_len = 0; | |
397 | key->conf.icv_len = sizeof(struct ieee80211_mmie); | |
398 | if (seq) | |
399 | for (j = 0; j < 6; j++) | |
400 | key->u.aes_cmac.rx_pn[j] = seq[6 - j - 1]; | |
3cfcf6ac JM |
401 | /* |
402 | * Initialize AES key state here as an optimization so that | |
403 | * it does not need to be initialized for every packet. | |
404 | */ | |
405 | key->u.aes_cmac.tfm = | |
406 | ieee80211_aes_cmac_key_setup(key_data); | |
1ac62ba7 BH |
407 | if (IS_ERR(key->u.aes_cmac.tfm)) { |
408 | err = PTR_ERR(key->u.aes_cmac.tfm); | |
3cfcf6ac | 409 | kfree(key); |
1f951a7f | 410 | return ERR_PTR(err); |
3cfcf6ac | 411 | } |
60ae0f20 | 412 | break; |
3cfcf6ac | 413 | } |
60ae0f20 JB |
414 | memcpy(key->conf.key, key_data, key_len); |
415 | INIT_LIST_HEAD(&key->list); | |
3cfcf6ac | 416 | |
db4d1169 JB |
417 | return key; |
418 | } | |
11a843b7 | 419 | |
ad0e2b5a JB |
420 | static void __ieee80211_key_destroy(struct ieee80211_key *key) |
421 | { | |
422 | if (!key) | |
423 | return; | |
424 | ||
d2460f4b JB |
425 | /* |
426 | * Synchronize so the TX path can no longer be using | |
427 | * this key before we free/remove it. | |
428 | */ | |
429 | synchronize_rcu(); | |
430 | ||
32162a4d JM |
431 | if (key->local) |
432 | ieee80211_key_disable_hw_accel(key); | |
ad0e2b5a | 433 | |
97359d12 | 434 | if (key->conf.cipher == WLAN_CIPHER_SUITE_CCMP) |
ad0e2b5a | 435 | ieee80211_aes_key_free(key->u.ccmp.tfm); |
97359d12 | 436 | if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC) |
ad0e2b5a | 437 | ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); |
3bff1865 | 438 | if (key->local) { |
32162a4d | 439 | ieee80211_debugfs_key_remove(key); |
3bff1865 YAP |
440 | key->sdata->crypto_tx_tailroom_needed_cnt--; |
441 | } | |
ad0e2b5a JB |
442 | |
443 | kfree(key); | |
444 | } | |
445 | ||
3ffc2a90 JB |
446 | int ieee80211_key_link(struct ieee80211_key *key, |
447 | struct ieee80211_sub_if_data *sdata, | |
448 | struct sta_info *sta) | |
db4d1169 JB |
449 | { |
450 | struct ieee80211_key *old_key; | |
3ffc2a90 | 451 | int idx, ret; |
67aa030c | 452 | bool pairwise; |
db4d1169 | 453 | |
db4d1169 JB |
454 | BUG_ON(!sdata); |
455 | BUG_ON(!key); | |
456 | ||
67aa030c | 457 | pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE; |
db4d1169 JB |
458 | idx = key->conf.keyidx; |
459 | key->local = sdata->local; | |
460 | key->sdata = sdata; | |
461 | key->sta = sta; | |
462 | ||
11a843b7 | 463 | if (sta) { |
11a843b7 JB |
464 | /* |
465 | * some hardware cannot handle TKIP with QoS, so | |
466 | * we indicate whether QoS could be in use. | |
467 | */ | |
c2c98fde | 468 | if (test_sta_flag(sta, WLAN_STA_WME)) |
11a843b7 JB |
469 | key->conf.flags |= IEEE80211_KEY_FLAG_WMM_STA; |
470 | } else { | |
05c914fe | 471 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { |
11a843b7 JB |
472 | struct sta_info *ap; |
473 | ||
3b96766f | 474 | /* |
b5c34f66 JB |
475 | * We're getting a sta pointer in, so must be under |
476 | * appropriate locking for sta_info_get(). | |
3b96766f | 477 | */ |
d0709a65 | 478 | |
11a843b7 | 479 | /* same here, the AP could be using QoS */ |
abe60632 | 480 | ap = sta_info_get(key->sdata, key->sdata->u.mgd.bssid); |
11a843b7 | 481 | if (ap) { |
c2c98fde | 482 | if (test_sta_flag(ap, WLAN_STA_WME)) |
11a843b7 JB |
483 | key->conf.flags |= |
484 | IEEE80211_KEY_FLAG_WMM_STA; | |
11a843b7 JB |
485 | } |
486 | } | |
11a843b7 JB |
487 | } |
488 | ||
ad0e2b5a | 489 | mutex_lock(&sdata->local->key_mtx); |
3b96766f | 490 | |
e31b8213 | 491 | if (sta && pairwise) |
40b275b6 | 492 | old_key = key_mtx_dereference(sdata->local, sta->ptk); |
e31b8213 | 493 | else if (sta) |
40b275b6 | 494 | old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]); |
d4e46a3d | 495 | else |
40b275b6 | 496 | old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
db4d1169 | 497 | |
3bff1865 YAP |
498 | increment_tailroom_need_count(sdata); |
499 | ||
e31b8213 | 500 | __ieee80211_key_replace(sdata, sta, pairwise, old_key, key); |
ad0e2b5a | 501 | __ieee80211_key_destroy(old_key); |
d4e46a3d | 502 | |
ad0e2b5a | 503 | ieee80211_debugfs_key_add(key); |
db4d1169 | 504 | |
3ffc2a90 | 505 | ret = ieee80211_key_enable_hw_accel(key); |
523d2f69 | 506 | |
ad0e2b5a | 507 | mutex_unlock(&sdata->local->key_mtx); |
3ffc2a90 JB |
508 | |
509 | return ret; | |
1f5a7e47 JB |
510 | } |
511 | ||
5c0c3641 | 512 | void __ieee80211_key_free(struct ieee80211_key *key) |
1f5a7e47 | 513 | { |
5c0c3641 JB |
514 | if (!key) |
515 | return; | |
516 | ||
3b96766f JB |
517 | /* |
518 | * Replace key with nothingness if it was ever used. | |
519 | */ | |
3a245766 | 520 | if (key->sdata) |
3b96766f | 521 | __ieee80211_key_replace(key->sdata, key->sta, |
e31b8213 JB |
522 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, |
523 | key, NULL); | |
ad0e2b5a | 524 | __ieee80211_key_destroy(key); |
3b96766f | 525 | } |
d4e46a3d | 526 | |
32162a4d JM |
527 | void ieee80211_key_free(struct ieee80211_local *local, |
528 | struct ieee80211_key *key) | |
3b96766f | 529 | { |
ad0e2b5a | 530 | mutex_lock(&local->key_mtx); |
3a245766 | 531 | __ieee80211_key_free(key); |
ad0e2b5a | 532 | mutex_unlock(&local->key_mtx); |
3a245766 JB |
533 | } |
534 | ||
ad0e2b5a | 535 | void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata) |
3a245766 JB |
536 | { |
537 | struct ieee80211_key *key; | |
11a843b7 | 538 | |
3a245766 | 539 | ASSERT_RTNL(); |
11a843b7 | 540 | |
9607e6b6 | 541 | if (WARN_ON(!ieee80211_sdata_running(sdata))) |
3a245766 | 542 | return; |
11a843b7 | 543 | |
ad0e2b5a | 544 | mutex_lock(&sdata->local->key_mtx); |
11a843b7 | 545 | |
3bff1865 YAP |
546 | sdata->crypto_tx_tailroom_needed_cnt = 0; |
547 | ||
548 | list_for_each_entry(key, &sdata->key_list, list) { | |
549 | increment_tailroom_need_count(sdata); | |
ad0e2b5a | 550 | ieee80211_key_enable_hw_accel(key); |
3bff1865 | 551 | } |
3b96766f | 552 | |
ad0e2b5a | 553 | mutex_unlock(&sdata->local->key_mtx); |
11a843b7 JB |
554 | } |
555 | ||
830af02f JB |
556 | void ieee80211_iter_keys(struct ieee80211_hw *hw, |
557 | struct ieee80211_vif *vif, | |
558 | void (*iter)(struct ieee80211_hw *hw, | |
559 | struct ieee80211_vif *vif, | |
560 | struct ieee80211_sta *sta, | |
561 | struct ieee80211_key_conf *key, | |
562 | void *data), | |
563 | void *iter_data) | |
564 | { | |
565 | struct ieee80211_local *local = hw_to_local(hw); | |
566 | struct ieee80211_key *key; | |
567 | struct ieee80211_sub_if_data *sdata; | |
568 | ||
569 | ASSERT_RTNL(); | |
570 | ||
571 | mutex_lock(&local->key_mtx); | |
572 | if (vif) { | |
573 | sdata = vif_to_sdata(vif); | |
574 | list_for_each_entry(key, &sdata->key_list, list) | |
575 | iter(hw, &sdata->vif, | |
576 | key->sta ? &key->sta->sta : NULL, | |
577 | &key->conf, iter_data); | |
578 | } else { | |
579 | list_for_each_entry(sdata, &local->interfaces, list) | |
580 | list_for_each_entry(key, &sdata->key_list, list) | |
581 | iter(hw, &sdata->vif, | |
582 | key->sta ? &key->sta->sta : NULL, | |
583 | &key->conf, iter_data); | |
584 | } | |
585 | mutex_unlock(&local->key_mtx); | |
586 | } | |
587 | EXPORT_SYMBOL(ieee80211_iter_keys); | |
588 | ||
ad0e2b5a | 589 | void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata) |
11a843b7 JB |
590 | { |
591 | struct ieee80211_key *key; | |
592 | ||
ad0e2b5a | 593 | ASSERT_RTNL(); |
db4d1169 | 594 | |
ad0e2b5a | 595 | mutex_lock(&sdata->local->key_mtx); |
11a843b7 | 596 | |
ad0e2b5a JB |
597 | list_for_each_entry(key, &sdata->key_list, list) |
598 | ieee80211_key_disable_hw_accel(key); | |
11a843b7 | 599 | |
ad0e2b5a | 600 | mutex_unlock(&sdata->local->key_mtx); |
3b96766f | 601 | } |
11a843b7 | 602 | |
3b96766f JB |
603 | void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata) |
604 | { | |
605 | struct ieee80211_key *key, *tmp; | |
db4d1169 | 606 | |
ad0e2b5a | 607 | mutex_lock(&sdata->local->key_mtx); |
3b96766f | 608 | |
3cfcf6ac | 609 | ieee80211_debugfs_key_remove_mgmt_default(sdata); |
3b96766f JB |
610 | |
611 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) | |
3a245766 | 612 | __ieee80211_key_free(key); |
3b96766f | 613 | |
f7e0104c JB |
614 | ieee80211_debugfs_key_update_default(sdata); |
615 | ||
ad0e2b5a | 616 | mutex_unlock(&sdata->local->key_mtx); |
11a843b7 | 617 | } |
c68f4b89 JB |
618 | |
619 | ||
620 | void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid, | |
621 | const u8 *replay_ctr, gfp_t gfp) | |
622 | { | |
623 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
624 | ||
625 | trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr); | |
626 | ||
627 | cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp); | |
628 | } | |
629 | EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify); | |
3ea542d3 JB |
630 | |
631 | void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf, | |
632 | struct ieee80211_key_seq *seq) | |
633 | { | |
634 | struct ieee80211_key *key; | |
635 | u64 pn64; | |
636 | ||
637 | if (WARN_ON(!(keyconf->flags & IEEE80211_KEY_FLAG_GENERATE_IV))) | |
638 | return; | |
639 | ||
640 | key = container_of(keyconf, struct ieee80211_key, conf); | |
641 | ||
642 | switch (key->conf.cipher) { | |
643 | case WLAN_CIPHER_SUITE_TKIP: | |
644 | seq->tkip.iv32 = key->u.tkip.tx.iv32; | |
645 | seq->tkip.iv16 = key->u.tkip.tx.iv16; | |
646 | break; | |
647 | case WLAN_CIPHER_SUITE_CCMP: | |
648 | pn64 = atomic64_read(&key->u.ccmp.tx_pn); | |
649 | seq->ccmp.pn[5] = pn64; | |
650 | seq->ccmp.pn[4] = pn64 >> 8; | |
651 | seq->ccmp.pn[3] = pn64 >> 16; | |
652 | seq->ccmp.pn[2] = pn64 >> 24; | |
653 | seq->ccmp.pn[1] = pn64 >> 32; | |
654 | seq->ccmp.pn[0] = pn64 >> 40; | |
655 | break; | |
656 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
657 | pn64 = atomic64_read(&key->u.aes_cmac.tx_pn); | |
658 | seq->ccmp.pn[5] = pn64; | |
659 | seq->ccmp.pn[4] = pn64 >> 8; | |
660 | seq->ccmp.pn[3] = pn64 >> 16; | |
661 | seq->ccmp.pn[2] = pn64 >> 24; | |
662 | seq->ccmp.pn[1] = pn64 >> 32; | |
663 | seq->ccmp.pn[0] = pn64 >> 40; | |
664 | break; | |
665 | default: | |
666 | WARN_ON(1); | |
667 | } | |
668 | } | |
669 | EXPORT_SYMBOL(ieee80211_get_key_tx_seq); | |
670 | ||
671 | void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf, | |
672 | int tid, struct ieee80211_key_seq *seq) | |
673 | { | |
674 | struct ieee80211_key *key; | |
675 | const u8 *pn; | |
676 | ||
677 | key = container_of(keyconf, struct ieee80211_key, conf); | |
678 | ||
679 | switch (key->conf.cipher) { | |
680 | case WLAN_CIPHER_SUITE_TKIP: | |
681 | if (WARN_ON(tid < 0 || tid >= NUM_RX_DATA_QUEUES)) | |
682 | return; | |
683 | seq->tkip.iv32 = key->u.tkip.rx[tid].iv32; | |
684 | seq->tkip.iv16 = key->u.tkip.rx[tid].iv16; | |
685 | break; | |
686 | case WLAN_CIPHER_SUITE_CCMP: | |
687 | if (WARN_ON(tid < -1 || tid >= NUM_RX_DATA_QUEUES)) | |
688 | return; | |
689 | if (tid < 0) | |
690 | pn = key->u.ccmp.rx_pn[NUM_RX_DATA_QUEUES]; | |
691 | else | |
692 | pn = key->u.ccmp.rx_pn[tid]; | |
693 | memcpy(seq->ccmp.pn, pn, CCMP_PN_LEN); | |
694 | break; | |
695 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
696 | if (WARN_ON(tid != 0)) | |
697 | return; | |
698 | pn = key->u.aes_cmac.rx_pn; | |
699 | memcpy(seq->aes_cmac.pn, pn, CMAC_PN_LEN); | |
700 | break; | |
701 | } | |
702 | } | |
703 | EXPORT_SYMBOL(ieee80211_get_key_rx_seq); |