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> |
d98ad83e | 6 | * Copyright 2013-2014 Intel Mobile Communications GmbH |
1f5a7e47 JB |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
11a843b7 JB |
13 | #include <linux/if_ether.h> |
14 | #include <linux/etherdevice.h> | |
15 | #include <linux/list.h> | |
d4e46a3d | 16 | #include <linux/rcupdate.h> |
db4d1169 | 17 | #include <linux/rtnetlink.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
bc3b2d7f | 19 | #include <linux/export.h> |
1f5a7e47 | 20 | #include <net/mac80211.h> |
d26ad377 | 21 | #include <asm/unaligned.h> |
1f5a7e47 | 22 | #include "ieee80211_i.h" |
24487981 | 23 | #include "driver-ops.h" |
1f5a7e47 JB |
24 | #include "debugfs_key.h" |
25 | #include "aes_ccm.h" | |
3cfcf6ac | 26 | #include "aes_cmac.h" |
1f5a7e47 | 27 | |
11a843b7 | 28 | |
dbbea671 JB |
29 | /** |
30 | * DOC: Key handling basics | |
11a843b7 JB |
31 | * |
32 | * Key handling in mac80211 is done based on per-interface (sub_if_data) | |
33 | * keys and per-station keys. Since each station belongs to an interface, | |
34 | * each station key also belongs to that interface. | |
35 | * | |
b5c34f66 JB |
36 | * Hardware acceleration is done on a best-effort basis for algorithms |
37 | * that are implemented in software, for each key the hardware is asked | |
38 | * to enable that key for offloading but if it cannot do that the key is | |
39 | * simply kept for software encryption (unless it is for an algorithm | |
40 | * that isn't implemented in software). | |
41 | * There is currently no way of knowing whether a key is handled in SW | |
42 | * or HW except by looking into debugfs. | |
11a843b7 | 43 | * |
b5c34f66 JB |
44 | * All key management is internally protected by a mutex. Within all |
45 | * other parts of mac80211, key references are, just as STA structure | |
46 | * references, protected by RCU. Note, however, that some things are | |
47 | * unprotected, namely the key->sta dereferences within the hardware | |
48 | * acceleration functions. This means that sta_info_destroy() must | |
49 | * remove the key which waits for an RCU grace period. | |
11a843b7 JB |
50 | */ |
51 | ||
52 | static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; | |
11a843b7 | 53 | |
ad0e2b5a | 54 | static void assert_key_lock(struct ieee80211_local *local) |
3b96766f | 55 | { |
46a5ebaf | 56 | lockdep_assert_held(&local->key_mtx); |
3b96766f JB |
57 | } |
58 | ||
3bff1865 YAP |
59 | static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata) |
60 | { | |
61 | /* | |
62 | * When this count is zero, SKB resizing for allocating tailroom | |
63 | * for IV or MMIC is skipped. But, this check has created two race | |
64 | * cases in xmit path while transiting from zero count to one: | |
65 | * | |
66 | * 1. SKB resize was skipped because no key was added but just before | |
67 | * the xmit key is added and SW encryption kicks off. | |
68 | * | |
69 | * 2. SKB resize was skipped because all the keys were hw planted but | |
70 | * just before xmit one of the key is deleted and SW encryption kicks | |
71 | * off. | |
72 | * | |
73 | * In both the above case SW encryption will find not enough space for | |
74 | * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c) | |
75 | * | |
76 | * Solution has been explained at | |
77 | * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net | |
78 | */ | |
79 | ||
80 | if (!sdata->crypto_tx_tailroom_needed_cnt++) { | |
81 | /* | |
82 | * Flush all XMIT packets currently using HW encryption or no | |
83 | * encryption at all if the count transition is from 0 -> 1. | |
84 | */ | |
85 | synchronize_net(); | |
86 | } | |
87 | } | |
88 | ||
3ffc2a90 | 89 | static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key) |
11a843b7 | 90 | { |
dc822b5d | 91 | struct ieee80211_sub_if_data *sdata; |
89c91cae | 92 | struct sta_info *sta; |
11a843b7 JB |
93 | int ret; |
94 | ||
3b96766f JB |
95 | might_sleep(); |
96 | ||
4619194a JB |
97 | if (key->flags & KEY_FLAG_TAINTED) { |
98 | /* If we get here, it's during resume and the key is | |
99 | * tainted so shouldn't be used/programmed any more. | |
100 | * However, its flags may still indicate that it was | |
101 | * programmed into the device (since we're in resume) | |
102 | * so clear that flag now to avoid trying to remove | |
103 | * it again later. | |
104 | */ | |
105 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; | |
27b3eb9c | 106 | return -EINVAL; |
4619194a | 107 | } |
27b3eb9c | 108 | |
e31b8213 | 109 | if (!key->local->ops->set_key) |
3ffc2a90 | 110 | goto out_unsupported; |
11a843b7 | 111 | |
ad0e2b5a JB |
112 | assert_key_lock(key->local); |
113 | ||
89c91cae | 114 | sta = key->sta; |
dc822b5d | 115 | |
e31b8213 JB |
116 | /* |
117 | * If this is a per-STA GTK, check if it | |
118 | * is supported; if not, return. | |
119 | */ | |
120 | if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) && | |
121 | !(key->local->hw.flags & IEEE80211_HW_SUPPORTS_PER_STA_GTK)) | |
122 | goto out_unsupported; | |
123 | ||
89c91cae JB |
124 | if (sta && !sta->uploaded) |
125 | goto out_unsupported; | |
126 | ||
dc822b5d | 127 | sdata = key->sdata; |
18890d4b HS |
128 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { |
129 | /* | |
130 | * The driver doesn't know anything about VLAN interfaces. | |
131 | * Hence, don't send GTKs for VLAN interfaces to the driver. | |
132 | */ | |
133 | if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) | |
134 | goto out_unsupported; | |
18890d4b | 135 | } |
11a843b7 | 136 | |
89c91cae JB |
137 | ret = drv_set_key(key->local, SET_KEY, sdata, |
138 | sta ? &sta->sta : NULL, &key->conf); | |
11a843b7 | 139 | |
e31b8213 | 140 | if (!ret) { |
11a843b7 | 141 | key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; |
3bff1865 | 142 | |
1e359a5d | 143 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
db12847c | 144 | (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) |
3bff1865 YAP |
145 | sdata->crypto_tx_tailroom_needed_cnt--; |
146 | ||
077a9154 AN |
147 | WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && |
148 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)); | |
149 | ||
e31b8213 JB |
150 | return 0; |
151 | } | |
11a843b7 | 152 | |
e31b8213 | 153 | if (ret != -ENOSPC && ret != -EOPNOTSUPP) |
bdcbd8e0 | 154 | sdata_err(sdata, |
0fb9a9ec | 155 | "failed to set key (%d, %pM) to hardware (%d)\n", |
89c91cae JB |
156 | key->conf.keyidx, |
157 | sta ? sta->sta.addr : bcast_addr, ret); | |
3ffc2a90 | 158 | |
e31b8213 JB |
159 | out_unsupported: |
160 | switch (key->conf.cipher) { | |
161 | case WLAN_CIPHER_SUITE_WEP40: | |
162 | case WLAN_CIPHER_SUITE_WEP104: | |
163 | case WLAN_CIPHER_SUITE_TKIP: | |
164 | case WLAN_CIPHER_SUITE_CCMP: | |
165 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
166 | /* all of these we can do in software */ | |
167 | return 0; | |
168 | default: | |
169 | return -EINVAL; | |
3ffc2a90 | 170 | } |
11a843b7 JB |
171 | } |
172 | ||
173 | static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key) | |
174 | { | |
dc822b5d | 175 | struct ieee80211_sub_if_data *sdata; |
89c91cae | 176 | struct sta_info *sta; |
11a843b7 JB |
177 | int ret; |
178 | ||
3b96766f JB |
179 | might_sleep(); |
180 | ||
db4d1169 | 181 | if (!key || !key->local->ops->set_key) |
11a843b7 JB |
182 | return; |
183 | ||
ad0e2b5a JB |
184 | assert_key_lock(key->local); |
185 | ||
186 | if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) | |
11a843b7 JB |
187 | return; |
188 | ||
89c91cae | 189 | sta = key->sta; |
dc822b5d JB |
190 | sdata = key->sdata; |
191 | ||
1e359a5d | 192 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
db12847c | 193 | (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) |
3bff1865 YAP |
194 | increment_tailroom_need_count(sdata); |
195 | ||
12375ef9 | 196 | ret = drv_set_key(key->local, DISABLE_KEY, sdata, |
89c91cae | 197 | sta ? &sta->sta : NULL, &key->conf); |
11a843b7 JB |
198 | |
199 | if (ret) | |
bdcbd8e0 | 200 | sdata_err(sdata, |
0fb9a9ec | 201 | "failed to remove key (%d, %pM) from hardware (%d)\n", |
89c91cae JB |
202 | key->conf.keyidx, |
203 | sta ? sta->sta.addr : bcast_addr, ret); | |
11a843b7 | 204 | |
3b96766f | 205 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; |
3b96766f JB |
206 | } |
207 | ||
208 | static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, | |
f7e0104c | 209 | int idx, bool uni, bool multi) |
3b96766f JB |
210 | { |
211 | struct ieee80211_key *key = NULL; | |
212 | ||
ad0e2b5a JB |
213 | assert_key_lock(sdata->local); |
214 | ||
3b96766f | 215 | if (idx >= 0 && idx < NUM_DEFAULT_KEYS) |
40b275b6 | 216 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
3b96766f | 217 | |
de5fad81 | 218 | if (uni) { |
f7e0104c | 219 | rcu_assign_pointer(sdata->default_unicast_key, key); |
de5fad81 YD |
220 | drv_set_default_unicast_key(sdata->local, sdata, idx); |
221 | } | |
222 | ||
f7e0104c JB |
223 | if (multi) |
224 | rcu_assign_pointer(sdata->default_multicast_key, key); | |
3b96766f | 225 | |
f7e0104c | 226 | ieee80211_debugfs_key_update_default(sdata); |
3b96766f JB |
227 | } |
228 | ||
f7e0104c JB |
229 | void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx, |
230 | bool uni, bool multi) | |
3b96766f | 231 | { |
ad0e2b5a | 232 | mutex_lock(&sdata->local->key_mtx); |
f7e0104c | 233 | __ieee80211_set_default_key(sdata, idx, uni, multi); |
ad0e2b5a | 234 | mutex_unlock(&sdata->local->key_mtx); |
3b96766f JB |
235 | } |
236 | ||
3cfcf6ac JM |
237 | static void |
238 | __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx) | |
239 | { | |
240 | struct ieee80211_key *key = NULL; | |
241 | ||
ad0e2b5a JB |
242 | assert_key_lock(sdata->local); |
243 | ||
3cfcf6ac JM |
244 | if (idx >= NUM_DEFAULT_KEYS && |
245 | idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
40b275b6 | 246 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
3cfcf6ac JM |
247 | |
248 | rcu_assign_pointer(sdata->default_mgmt_key, key); | |
249 | ||
f7e0104c | 250 | ieee80211_debugfs_key_update_default(sdata); |
3cfcf6ac JM |
251 | } |
252 | ||
253 | void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, | |
254 | int idx) | |
255 | { | |
ad0e2b5a | 256 | mutex_lock(&sdata->local->key_mtx); |
3cfcf6ac | 257 | __ieee80211_set_default_mgmt_key(sdata, idx); |
ad0e2b5a | 258 | mutex_unlock(&sdata->local->key_mtx); |
3cfcf6ac JM |
259 | } |
260 | ||
3b96766f | 261 | |
3b8d9c29 JB |
262 | static void ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, |
263 | struct sta_info *sta, | |
264 | bool pairwise, | |
265 | struct ieee80211_key *old, | |
266 | struct ieee80211_key *new) | |
3b96766f | 267 | { |
f7e0104c JB |
268 | int idx; |
269 | bool defunikey, defmultikey, defmgmtkey; | |
3b96766f | 270 | |
5282c3ba JB |
271 | /* caller must provide at least one old/new */ |
272 | if (WARN_ON(!new && !old)) | |
273 | return; | |
274 | ||
3b96766f | 275 | if (new) |
f850e00f | 276 | list_add_tail(&new->list, &sdata->key_list); |
3b96766f | 277 | |
2475b1cc | 278 | WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx); |
3b96766f | 279 | |
2475b1cc MS |
280 | if (old) |
281 | idx = old->conf.keyidx; | |
282 | else | |
283 | idx = new->conf.keyidx; | |
3b96766f | 284 | |
2475b1cc MS |
285 | if (sta) { |
286 | if (pairwise) { | |
287 | rcu_assign_pointer(sta->ptk[idx], new); | |
288 | sta->ptk_idx = idx; | |
289 | } else { | |
290 | rcu_assign_pointer(sta->gtk[idx], new); | |
291 | sta->gtk_idx = idx; | |
292 | } | |
293 | } else { | |
40b275b6 JB |
294 | defunikey = old && |
295 | old == key_mtx_dereference(sdata->local, | |
296 | sdata->default_unicast_key); | |
297 | defmultikey = old && | |
298 | old == key_mtx_dereference(sdata->local, | |
299 | sdata->default_multicast_key); | |
300 | defmgmtkey = old && | |
301 | old == key_mtx_dereference(sdata->local, | |
302 | sdata->default_mgmt_key); | |
3b96766f | 303 | |
f7e0104c JB |
304 | if (defunikey && !new) |
305 | __ieee80211_set_default_key(sdata, -1, true, false); | |
306 | if (defmultikey && !new) | |
307 | __ieee80211_set_default_key(sdata, -1, false, true); | |
3cfcf6ac JM |
308 | if (defmgmtkey && !new) |
309 | __ieee80211_set_default_mgmt_key(sdata, -1); | |
3b96766f JB |
310 | |
311 | rcu_assign_pointer(sdata->keys[idx], new); | |
f7e0104c JB |
312 | if (defunikey && new) |
313 | __ieee80211_set_default_key(sdata, new->conf.keyidx, | |
314 | true, false); | |
315 | if (defmultikey && new) | |
316 | __ieee80211_set_default_key(sdata, new->conf.keyidx, | |
317 | false, true); | |
3cfcf6ac JM |
318 | if (defmgmtkey && new) |
319 | __ieee80211_set_default_mgmt_key(sdata, | |
320 | new->conf.keyidx); | |
3b96766f JB |
321 | } |
322 | ||
b5c34f66 JB |
323 | if (old) |
324 | list_del(&old->list); | |
11a843b7 JB |
325 | } |
326 | ||
2475b1cc MS |
327 | struct ieee80211_key * |
328 | ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, | |
329 | const u8 *key_data, | |
330 | size_t seq_len, const u8 *seq, | |
331 | const struct ieee80211_cipher_scheme *cs) | |
1f5a7e47 JB |
332 | { |
333 | struct ieee80211_key *key; | |
1ac62ba7 | 334 | int i, j, err; |
1f5a7e47 | 335 | |
8c5bb1fa JB |
336 | if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)) |
337 | return ERR_PTR(-EINVAL); | |
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: | |
4325f6ca JB |
356 | key->conf.iv_len = IEEE80211_WEP_IV_LEN; |
357 | key->conf.icv_len = IEEE80211_WEP_ICV_LEN; | |
76708dee | 358 | break; |
97359d12 | 359 | case WLAN_CIPHER_SUITE_TKIP: |
4325f6ca JB |
360 | key->conf.iv_len = IEEE80211_TKIP_IV_LEN; |
361 | key->conf.icv_len = IEEE80211_TKIP_ICV_LEN; | |
9f26a952 | 362 | if (seq) { |
5a306f58 | 363 | for (i = 0; i < IEEE80211_NUM_TIDS; i++) { |
faa8fdc8 JM |
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: |
4325f6ca JB |
373 | key->conf.iv_len = IEEE80211_CCMP_HDR_LEN; |
374 | key->conf.icv_len = IEEE80211_CCMP_MIC_LEN; | |
9f26a952 | 375 | if (seq) { |
5a306f58 | 376 | for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) |
4325f6ca | 377 | for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++) |
faa8fdc8 | 378 | key->u.ccmp.rx_pn[i][j] = |
4325f6ca | 379 | seq[IEEE80211_CCMP_PN_LEN - j - 1]; |
faa8fdc8 | 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) | |
4325f6ca | 396 | for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++) |
0f927323 | 397 | key->u.aes_cmac.rx_pn[j] = |
4325f6ca | 398 | seq[IEEE80211_CMAC_PN_LEN - j - 1]; |
3cfcf6ac JM |
399 | /* |
400 | * Initialize AES key state here as an optimization so that | |
401 | * it does not need to be initialized for every packet. | |
402 | */ | |
403 | key->u.aes_cmac.tfm = | |
404 | ieee80211_aes_cmac_key_setup(key_data); | |
1ac62ba7 BH |
405 | if (IS_ERR(key->u.aes_cmac.tfm)) { |
406 | err = PTR_ERR(key->u.aes_cmac.tfm); | |
3cfcf6ac | 407 | kfree(key); |
1f951a7f | 408 | return ERR_PTR(err); |
3cfcf6ac | 409 | } |
60ae0f20 | 410 | break; |
2475b1cc MS |
411 | default: |
412 | if (cs) { | |
413 | size_t len = (seq_len > MAX_PN_LEN) ? | |
414 | MAX_PN_LEN : seq_len; | |
415 | ||
416 | key->conf.iv_len = cs->hdr_len; | |
417 | key->conf.icv_len = cs->mic_len; | |
418 | for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) | |
419 | for (j = 0; j < len; j++) | |
420 | key->u.gen.rx_pn[i][j] = | |
421 | seq[len - j - 1]; | |
422 | } | |
3cfcf6ac | 423 | } |
60ae0f20 JB |
424 | memcpy(key->conf.key, key_data, key_len); |
425 | INIT_LIST_HEAD(&key->list); | |
3cfcf6ac | 426 | |
db4d1169 JB |
427 | return key; |
428 | } | |
11a843b7 | 429 | |
79cf2dfa JB |
430 | static void ieee80211_key_free_common(struct ieee80211_key *key) |
431 | { | |
432 | if (key->conf.cipher == WLAN_CIPHER_SUITE_CCMP) | |
433 | ieee80211_aes_key_free(key->u.ccmp.tfm); | |
434 | if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC) | |
435 | ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); | |
29c3f9c3 | 436 | kzfree(key); |
79cf2dfa JB |
437 | } |
438 | ||
6d10e46b JB |
439 | static void __ieee80211_key_destroy(struct ieee80211_key *key, |
440 | bool delay_tailroom) | |
ad0e2b5a | 441 | { |
32162a4d JM |
442 | if (key->local) |
443 | ieee80211_key_disable_hw_accel(key); | |
ad0e2b5a | 444 | |
3bff1865 | 445 | if (key->local) { |
8d1f7ecd JB |
446 | struct ieee80211_sub_if_data *sdata = key->sdata; |
447 | ||
32162a4d | 448 | ieee80211_debugfs_key_remove(key); |
8d1f7ecd JB |
449 | |
450 | if (delay_tailroom) { | |
451 | /* see ieee80211_delayed_tailroom_dec */ | |
452 | sdata->crypto_tx_tailroom_pending_dec++; | |
453 | schedule_delayed_work(&sdata->dec_tailroom_needed_wk, | |
454 | HZ/2); | |
455 | } else { | |
456 | sdata->crypto_tx_tailroom_needed_cnt--; | |
457 | } | |
3bff1865 | 458 | } |
ad0e2b5a | 459 | |
79cf2dfa JB |
460 | ieee80211_key_free_common(key); |
461 | } | |
462 | ||
6d10e46b JB |
463 | static void ieee80211_key_destroy(struct ieee80211_key *key, |
464 | bool delay_tailroom) | |
465 | { | |
466 | if (!key) | |
467 | return; | |
468 | ||
469 | /* | |
470 | * Synchronize so the TX path can no longer be using | |
471 | * this key before we free/remove it. | |
472 | */ | |
473 | synchronize_net(); | |
474 | ||
475 | __ieee80211_key_destroy(key, delay_tailroom); | |
476 | } | |
477 | ||
79cf2dfa JB |
478 | void ieee80211_key_free_unused(struct ieee80211_key *key) |
479 | { | |
480 | WARN_ON(key->sdata || key->local); | |
481 | ieee80211_key_free_common(key); | |
ad0e2b5a JB |
482 | } |
483 | ||
3ffc2a90 JB |
484 | int ieee80211_key_link(struct ieee80211_key *key, |
485 | struct ieee80211_sub_if_data *sdata, | |
486 | struct sta_info *sta) | |
db4d1169 | 487 | { |
27b3eb9c | 488 | struct ieee80211_local *local = sdata->local; |
db4d1169 | 489 | struct ieee80211_key *old_key; |
3ffc2a90 | 490 | int idx, ret; |
67aa030c | 491 | bool pairwise; |
db4d1169 | 492 | |
67aa030c | 493 | pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE; |
db4d1169 JB |
494 | idx = key->conf.keyidx; |
495 | key->local = sdata->local; | |
496 | key->sdata = sdata; | |
497 | key->sta = sta; | |
498 | ||
ad0e2b5a | 499 | mutex_lock(&sdata->local->key_mtx); |
3b96766f | 500 | |
e31b8213 | 501 | if (sta && pairwise) |
2475b1cc | 502 | old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]); |
e31b8213 | 503 | else if (sta) |
40b275b6 | 504 | old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]); |
d4e46a3d | 505 | else |
40b275b6 | 506 | old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
db4d1169 | 507 | |
3bff1865 YAP |
508 | increment_tailroom_need_count(sdata); |
509 | ||
3b8d9c29 JB |
510 | ieee80211_key_replace(sdata, sta, pairwise, old_key, key); |
511 | ieee80211_key_destroy(old_key, true); | |
d4e46a3d | 512 | |
ad0e2b5a | 513 | ieee80211_debugfs_key_add(key); |
db4d1169 | 514 | |
27b3eb9c JB |
515 | if (!local->wowlan) { |
516 | ret = ieee80211_key_enable_hw_accel(key); | |
517 | if (ret) | |
518 | ieee80211_key_free(key, true); | |
519 | } else { | |
520 | ret = 0; | |
521 | } | |
79cf2dfa | 522 | |
ad0e2b5a | 523 | mutex_unlock(&sdata->local->key_mtx); |
3ffc2a90 JB |
524 | |
525 | return ret; | |
1f5a7e47 JB |
526 | } |
527 | ||
3b8d9c29 | 528 | void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom) |
1f5a7e47 | 529 | { |
5c0c3641 JB |
530 | if (!key) |
531 | return; | |
532 | ||
3b96766f JB |
533 | /* |
534 | * Replace key with nothingness if it was ever used. | |
535 | */ | |
3a245766 | 536 | if (key->sdata) |
3b8d9c29 | 537 | ieee80211_key_replace(key->sdata, key->sta, |
e31b8213 JB |
538 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, |
539 | key, NULL); | |
3b8d9c29 | 540 | ieee80211_key_destroy(key, delay_tailroom); |
3b96766f | 541 | } |
d4e46a3d | 542 | |
ad0e2b5a | 543 | void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata) |
3a245766 JB |
544 | { |
545 | struct ieee80211_key *key; | |
11a843b7 | 546 | |
3a245766 | 547 | ASSERT_RTNL(); |
11a843b7 | 548 | |
9607e6b6 | 549 | if (WARN_ON(!ieee80211_sdata_running(sdata))) |
3a245766 | 550 | return; |
11a843b7 | 551 | |
ad0e2b5a | 552 | mutex_lock(&sdata->local->key_mtx); |
11a843b7 | 553 | |
3bff1865 YAP |
554 | sdata->crypto_tx_tailroom_needed_cnt = 0; |
555 | ||
556 | list_for_each_entry(key, &sdata->key_list, list) { | |
557 | increment_tailroom_need_count(sdata); | |
ad0e2b5a | 558 | ieee80211_key_enable_hw_accel(key); |
3bff1865 | 559 | } |
3b96766f | 560 | |
ad0e2b5a | 561 | mutex_unlock(&sdata->local->key_mtx); |
11a843b7 JB |
562 | } |
563 | ||
830af02f JB |
564 | void ieee80211_iter_keys(struct ieee80211_hw *hw, |
565 | struct ieee80211_vif *vif, | |
566 | void (*iter)(struct ieee80211_hw *hw, | |
567 | struct ieee80211_vif *vif, | |
568 | struct ieee80211_sta *sta, | |
569 | struct ieee80211_key_conf *key, | |
570 | void *data), | |
571 | void *iter_data) | |
572 | { | |
573 | struct ieee80211_local *local = hw_to_local(hw); | |
27b3eb9c | 574 | struct ieee80211_key *key, *tmp; |
830af02f JB |
575 | struct ieee80211_sub_if_data *sdata; |
576 | ||
577 | ASSERT_RTNL(); | |
578 | ||
579 | mutex_lock(&local->key_mtx); | |
580 | if (vif) { | |
581 | sdata = vif_to_sdata(vif); | |
27b3eb9c | 582 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) |
830af02f JB |
583 | iter(hw, &sdata->vif, |
584 | key->sta ? &key->sta->sta : NULL, | |
585 | &key->conf, iter_data); | |
586 | } else { | |
587 | list_for_each_entry(sdata, &local->interfaces, list) | |
27b3eb9c JB |
588 | list_for_each_entry_safe(key, tmp, |
589 | &sdata->key_list, list) | |
830af02f JB |
590 | iter(hw, &sdata->vif, |
591 | key->sta ? &key->sta->sta : NULL, | |
592 | &key->conf, iter_data); | |
593 | } | |
594 | mutex_unlock(&local->key_mtx); | |
595 | } | |
596 | EXPORT_SYMBOL(ieee80211_iter_keys); | |
597 | ||
7907c7d3 JB |
598 | static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata, |
599 | struct list_head *keys) | |
3b96766f JB |
600 | { |
601 | struct ieee80211_key *key, *tmp; | |
3b96766f | 602 | |
8d1f7ecd JB |
603 | sdata->crypto_tx_tailroom_needed_cnt -= |
604 | sdata->crypto_tx_tailroom_pending_dec; | |
605 | sdata->crypto_tx_tailroom_pending_dec = 0; | |
606 | ||
3cfcf6ac | 607 | ieee80211_debugfs_key_remove_mgmt_default(sdata); |
3b96766f | 608 | |
6d10e46b JB |
609 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) { |
610 | ieee80211_key_replace(key->sdata, key->sta, | |
611 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
612 | key, NULL); | |
7907c7d3 | 613 | list_add_tail(&key->list, keys); |
6d10e46b | 614 | } |
3b96766f | 615 | |
f7e0104c | 616 | ieee80211_debugfs_key_update_default(sdata); |
7907c7d3 | 617 | } |
f7e0104c | 618 | |
7907c7d3 JB |
619 | void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata, |
620 | bool force_synchronize) | |
621 | { | |
622 | struct ieee80211_local *local = sdata->local; | |
623 | struct ieee80211_sub_if_data *vlan; | |
624 | struct ieee80211_key *key, *tmp; | |
625 | LIST_HEAD(keys); | |
626 | ||
627 | cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk); | |
628 | ||
629 | mutex_lock(&local->key_mtx); | |
630 | ||
631 | ieee80211_free_keys_iface(sdata, &keys); | |
632 | ||
633 | if (sdata->vif.type == NL80211_IFTYPE_AP) { | |
634 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
635 | ieee80211_free_keys_iface(vlan, &keys); | |
6d10e46b JB |
636 | } |
637 | ||
7907c7d3 JB |
638 | if (!list_empty(&keys) || force_synchronize) |
639 | synchronize_net(); | |
640 | list_for_each_entry_safe(key, tmp, &keys, list) | |
641 | __ieee80211_key_destroy(key, false); | |
642 | ||
8d1f7ecd JB |
643 | WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || |
644 | sdata->crypto_tx_tailroom_pending_dec); | |
7907c7d3 JB |
645 | if (sdata->vif.type == NL80211_IFTYPE_AP) { |
646 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
647 | WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt || | |
648 | vlan->crypto_tx_tailroom_pending_dec); | |
649 | } | |
8d1f7ecd | 650 | |
7907c7d3 | 651 | mutex_unlock(&local->key_mtx); |
11a843b7 | 652 | } |
c68f4b89 | 653 | |
6d10e46b JB |
654 | void ieee80211_free_sta_keys(struct ieee80211_local *local, |
655 | struct sta_info *sta) | |
656 | { | |
c8782078 | 657 | struct ieee80211_key *key; |
6d10e46b JB |
658 | int i; |
659 | ||
660 | mutex_lock(&local->key_mtx); | |
28a9bc68 | 661 | for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) { |
6d10e46b JB |
662 | key = key_mtx_dereference(local, sta->gtk[i]); |
663 | if (!key) | |
664 | continue; | |
665 | ieee80211_key_replace(key->sdata, key->sta, | |
666 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
667 | key, NULL); | |
c8782078 | 668 | __ieee80211_key_destroy(key, true); |
6d10e46b JB |
669 | } |
670 | ||
2475b1cc MS |
671 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { |
672 | key = key_mtx_dereference(local, sta->ptk[i]); | |
673 | if (!key) | |
674 | continue; | |
6d10e46b JB |
675 | ieee80211_key_replace(key->sdata, key->sta, |
676 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
677 | key, NULL); | |
6d10e46b | 678 | __ieee80211_key_destroy(key, true); |
c8782078 | 679 | } |
6d10e46b JB |
680 | |
681 | mutex_unlock(&local->key_mtx); | |
682 | } | |
683 | ||
8d1f7ecd JB |
684 | void ieee80211_delayed_tailroom_dec(struct work_struct *wk) |
685 | { | |
686 | struct ieee80211_sub_if_data *sdata; | |
687 | ||
688 | sdata = container_of(wk, struct ieee80211_sub_if_data, | |
689 | dec_tailroom_needed_wk.work); | |
690 | ||
691 | /* | |
692 | * The reason for the delayed tailroom needed decrementing is to | |
693 | * make roaming faster: during roaming, all keys are first deleted | |
694 | * and then new keys are installed. The first new key causes the | |
695 | * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes | |
696 | * the cost of synchronize_net() (which can be slow). Avoid this | |
697 | * by deferring the crypto_tx_tailroom_needed_cnt decrementing on | |
698 | * key removal for a while, so if we roam the value is larger than | |
699 | * zero and no 0->1 transition happens. | |
700 | * | |
701 | * The cost is that if the AP switching was from an AP with keys | |
702 | * to one without, we still allocate tailroom while it would no | |
703 | * longer be needed. However, in the typical (fast) roaming case | |
704 | * within an ESS this usually won't happen. | |
705 | */ | |
706 | ||
707 | mutex_lock(&sdata->local->key_mtx); | |
708 | sdata->crypto_tx_tailroom_needed_cnt -= | |
709 | sdata->crypto_tx_tailroom_pending_dec; | |
710 | sdata->crypto_tx_tailroom_pending_dec = 0; | |
711 | mutex_unlock(&sdata->local->key_mtx); | |
712 | } | |
c68f4b89 JB |
713 | |
714 | void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid, | |
715 | const u8 *replay_ctr, gfp_t gfp) | |
716 | { | |
717 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
718 | ||
719 | trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr); | |
720 | ||
721 | cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp); | |
722 | } | |
723 | EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify); | |
3ea542d3 JB |
724 | |
725 | void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf, | |
726 | struct ieee80211_key_seq *seq) | |
727 | { | |
728 | struct ieee80211_key *key; | |
729 | u64 pn64; | |
730 | ||
731 | if (WARN_ON(!(keyconf->flags & IEEE80211_KEY_FLAG_GENERATE_IV))) | |
732 | return; | |
733 | ||
734 | key = container_of(keyconf, struct ieee80211_key, conf); | |
735 | ||
736 | switch (key->conf.cipher) { | |
737 | case WLAN_CIPHER_SUITE_TKIP: | |
738 | seq->tkip.iv32 = key->u.tkip.tx.iv32; | |
739 | seq->tkip.iv16 = key->u.tkip.tx.iv16; | |
740 | break; | |
741 | case WLAN_CIPHER_SUITE_CCMP: | |
742 | pn64 = atomic64_read(&key->u.ccmp.tx_pn); | |
743 | seq->ccmp.pn[5] = pn64; | |
744 | seq->ccmp.pn[4] = pn64 >> 8; | |
745 | seq->ccmp.pn[3] = pn64 >> 16; | |
746 | seq->ccmp.pn[2] = pn64 >> 24; | |
747 | seq->ccmp.pn[1] = pn64 >> 32; | |
748 | seq->ccmp.pn[0] = pn64 >> 40; | |
749 | break; | |
750 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
751 | pn64 = atomic64_read(&key->u.aes_cmac.tx_pn); | |
752 | seq->ccmp.pn[5] = pn64; | |
753 | seq->ccmp.pn[4] = pn64 >> 8; | |
754 | seq->ccmp.pn[3] = pn64 >> 16; | |
755 | seq->ccmp.pn[2] = pn64 >> 24; | |
756 | seq->ccmp.pn[1] = pn64 >> 32; | |
757 | seq->ccmp.pn[0] = pn64 >> 40; | |
758 | break; | |
759 | default: | |
760 | WARN_ON(1); | |
761 | } | |
762 | } | |
763 | EXPORT_SYMBOL(ieee80211_get_key_tx_seq); | |
764 | ||
765 | void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf, | |
766 | int tid, struct ieee80211_key_seq *seq) | |
767 | { | |
768 | struct ieee80211_key *key; | |
769 | const u8 *pn; | |
770 | ||
771 | key = container_of(keyconf, struct ieee80211_key, conf); | |
772 | ||
773 | switch (key->conf.cipher) { | |
774 | case WLAN_CIPHER_SUITE_TKIP: | |
5a306f58 | 775 | if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) |
3ea542d3 JB |
776 | return; |
777 | seq->tkip.iv32 = key->u.tkip.rx[tid].iv32; | |
778 | seq->tkip.iv16 = key->u.tkip.rx[tid].iv16; | |
779 | break; | |
780 | case WLAN_CIPHER_SUITE_CCMP: | |
5a306f58 | 781 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) |
3ea542d3 JB |
782 | return; |
783 | if (tid < 0) | |
5a306f58 | 784 | pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; |
3ea542d3 JB |
785 | else |
786 | pn = key->u.ccmp.rx_pn[tid]; | |
4325f6ca | 787 | memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN); |
3ea542d3 JB |
788 | break; |
789 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
790 | if (WARN_ON(tid != 0)) | |
791 | return; | |
792 | pn = key->u.aes_cmac.rx_pn; | |
4325f6ca | 793 | memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN); |
3ea542d3 JB |
794 | break; |
795 | } | |
796 | } | |
797 | EXPORT_SYMBOL(ieee80211_get_key_rx_seq); | |
27b3eb9c JB |
798 | |
799 | void ieee80211_set_key_tx_seq(struct ieee80211_key_conf *keyconf, | |
800 | struct ieee80211_key_seq *seq) | |
801 | { | |
802 | struct ieee80211_key *key; | |
803 | u64 pn64; | |
804 | ||
805 | key = container_of(keyconf, struct ieee80211_key, conf); | |
806 | ||
807 | switch (key->conf.cipher) { | |
808 | case WLAN_CIPHER_SUITE_TKIP: | |
809 | key->u.tkip.tx.iv32 = seq->tkip.iv32; | |
810 | key->u.tkip.tx.iv16 = seq->tkip.iv16; | |
811 | break; | |
812 | case WLAN_CIPHER_SUITE_CCMP: | |
813 | pn64 = (u64)seq->ccmp.pn[5] | | |
814 | ((u64)seq->ccmp.pn[4] << 8) | | |
815 | ((u64)seq->ccmp.pn[3] << 16) | | |
816 | ((u64)seq->ccmp.pn[2] << 24) | | |
817 | ((u64)seq->ccmp.pn[1] << 32) | | |
818 | ((u64)seq->ccmp.pn[0] << 40); | |
819 | atomic64_set(&key->u.ccmp.tx_pn, pn64); | |
820 | break; | |
821 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
822 | pn64 = (u64)seq->aes_cmac.pn[5] | | |
823 | ((u64)seq->aes_cmac.pn[4] << 8) | | |
824 | ((u64)seq->aes_cmac.pn[3] << 16) | | |
825 | ((u64)seq->aes_cmac.pn[2] << 24) | | |
826 | ((u64)seq->aes_cmac.pn[1] << 32) | | |
827 | ((u64)seq->aes_cmac.pn[0] << 40); | |
828 | atomic64_set(&key->u.aes_cmac.tx_pn, pn64); | |
829 | break; | |
830 | default: | |
831 | WARN_ON(1); | |
832 | break; | |
833 | } | |
834 | } | |
835 | EXPORT_SYMBOL_GPL(ieee80211_set_key_tx_seq); | |
836 | ||
837 | void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf, | |
838 | int tid, struct ieee80211_key_seq *seq) | |
839 | { | |
840 | struct ieee80211_key *key; | |
841 | u8 *pn; | |
842 | ||
843 | key = container_of(keyconf, struct ieee80211_key, conf); | |
844 | ||
845 | switch (key->conf.cipher) { | |
846 | case WLAN_CIPHER_SUITE_TKIP: | |
847 | if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) | |
848 | return; | |
849 | key->u.tkip.rx[tid].iv32 = seq->tkip.iv32; | |
850 | key->u.tkip.rx[tid].iv16 = seq->tkip.iv16; | |
851 | break; | |
852 | case WLAN_CIPHER_SUITE_CCMP: | |
853 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) | |
854 | return; | |
855 | if (tid < 0) | |
856 | pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; | |
857 | else | |
858 | pn = key->u.ccmp.rx_pn[tid]; | |
859 | memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN); | |
860 | break; | |
861 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
862 | if (WARN_ON(tid != 0)) | |
863 | return; | |
864 | pn = key->u.aes_cmac.rx_pn; | |
865 | memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN); | |
866 | break; | |
867 | default: | |
868 | WARN_ON(1); | |
869 | break; | |
870 | } | |
871 | } | |
872 | EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq); | |
873 | ||
874 | void ieee80211_remove_key(struct ieee80211_key_conf *keyconf) | |
875 | { | |
876 | struct ieee80211_key *key; | |
877 | ||
878 | key = container_of(keyconf, struct ieee80211_key, conf); | |
879 | ||
880 | assert_key_lock(key->local); | |
881 | ||
882 | /* | |
883 | * if key was uploaded, we assume the driver will/has remove(d) | |
884 | * it, so adjust bookkeeping accordingly | |
885 | */ | |
886 | if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { | |
887 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; | |
888 | ||
1e359a5d | 889 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
db12847c | 890 | (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) |
27b3eb9c JB |
891 | increment_tailroom_need_count(key->sdata); |
892 | } | |
893 | ||
894 | ieee80211_key_free(key, false); | |
895 | } | |
896 | EXPORT_SYMBOL_GPL(ieee80211_remove_key); | |
897 | ||
898 | struct ieee80211_key_conf * | |
899 | ieee80211_gtk_rekey_add(struct ieee80211_vif *vif, | |
900 | struct ieee80211_key_conf *keyconf) | |
901 | { | |
902 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
903 | struct ieee80211_local *local = sdata->local; | |
904 | struct ieee80211_key *key; | |
905 | int err; | |
906 | ||
907 | if (WARN_ON(!local->wowlan)) | |
908 | return ERR_PTR(-EINVAL); | |
909 | ||
910 | if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) | |
911 | return ERR_PTR(-EINVAL); | |
912 | ||
913 | key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx, | |
914 | keyconf->keylen, keyconf->key, | |
2475b1cc | 915 | 0, NULL, NULL); |
27b3eb9c | 916 | if (IS_ERR(key)) |
c5dc164d | 917 | return ERR_CAST(key); |
27b3eb9c JB |
918 | |
919 | if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED) | |
920 | key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT; | |
921 | ||
922 | err = ieee80211_key_link(key, sdata, NULL); | |
923 | if (err) | |
924 | return ERR_PTR(err); | |
925 | ||
926 | return &key->conf; | |
927 | } | |
928 | EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add); |