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 JB |
143 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
144 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) || | |
145 | (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))) | |
3bff1865 YAP |
146 | sdata->crypto_tx_tailroom_needed_cnt--; |
147 | ||
077a9154 AN |
148 | WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && |
149 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)); | |
150 | ||
e31b8213 JB |
151 | return 0; |
152 | } | |
11a843b7 | 153 | |
e31b8213 | 154 | if (ret != -ENOSPC && ret != -EOPNOTSUPP) |
bdcbd8e0 | 155 | sdata_err(sdata, |
0fb9a9ec | 156 | "failed to set key (%d, %pM) to hardware (%d)\n", |
89c91cae JB |
157 | key->conf.keyidx, |
158 | sta ? sta->sta.addr : bcast_addr, ret); | |
3ffc2a90 | 159 | |
e31b8213 JB |
160 | out_unsupported: |
161 | switch (key->conf.cipher) { | |
162 | case WLAN_CIPHER_SUITE_WEP40: | |
163 | case WLAN_CIPHER_SUITE_WEP104: | |
164 | case WLAN_CIPHER_SUITE_TKIP: | |
165 | case WLAN_CIPHER_SUITE_CCMP: | |
166 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
167 | /* all of these we can do in software */ | |
168 | return 0; | |
169 | default: | |
170 | return -EINVAL; | |
3ffc2a90 | 171 | } |
11a843b7 JB |
172 | } |
173 | ||
174 | static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key) | |
175 | { | |
dc822b5d | 176 | struct ieee80211_sub_if_data *sdata; |
89c91cae | 177 | struct sta_info *sta; |
11a843b7 JB |
178 | int ret; |
179 | ||
3b96766f JB |
180 | might_sleep(); |
181 | ||
db4d1169 | 182 | if (!key || !key->local->ops->set_key) |
11a843b7 JB |
183 | return; |
184 | ||
ad0e2b5a JB |
185 | assert_key_lock(key->local); |
186 | ||
187 | if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) | |
11a843b7 JB |
188 | return; |
189 | ||
89c91cae | 190 | sta = key->sta; |
dc822b5d JB |
191 | sdata = key->sdata; |
192 | ||
1e359a5d JB |
193 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
194 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) || | |
195 | (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))) | |
3bff1865 YAP |
196 | increment_tailroom_need_count(sdata); |
197 | ||
12375ef9 | 198 | ret = drv_set_key(key->local, DISABLE_KEY, sdata, |
89c91cae | 199 | sta ? &sta->sta : NULL, &key->conf); |
11a843b7 JB |
200 | |
201 | if (ret) | |
bdcbd8e0 | 202 | sdata_err(sdata, |
0fb9a9ec | 203 | "failed to remove key (%d, %pM) from hardware (%d)\n", |
89c91cae JB |
204 | key->conf.keyidx, |
205 | sta ? sta->sta.addr : bcast_addr, ret); | |
11a843b7 | 206 | |
3b96766f | 207 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; |
3b96766f JB |
208 | } |
209 | ||
210 | static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, | |
f7e0104c | 211 | int idx, bool uni, bool multi) |
3b96766f JB |
212 | { |
213 | struct ieee80211_key *key = NULL; | |
214 | ||
ad0e2b5a JB |
215 | assert_key_lock(sdata->local); |
216 | ||
3b96766f | 217 | if (idx >= 0 && idx < NUM_DEFAULT_KEYS) |
40b275b6 | 218 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
3b96766f | 219 | |
de5fad81 | 220 | if (uni) { |
f7e0104c | 221 | rcu_assign_pointer(sdata->default_unicast_key, key); |
de5fad81 YD |
222 | drv_set_default_unicast_key(sdata->local, sdata, idx); |
223 | } | |
224 | ||
f7e0104c JB |
225 | if (multi) |
226 | rcu_assign_pointer(sdata->default_multicast_key, key); | |
3b96766f | 227 | |
f7e0104c | 228 | ieee80211_debugfs_key_update_default(sdata); |
3b96766f JB |
229 | } |
230 | ||
f7e0104c JB |
231 | void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx, |
232 | bool uni, bool multi) | |
3b96766f | 233 | { |
ad0e2b5a | 234 | mutex_lock(&sdata->local->key_mtx); |
f7e0104c | 235 | __ieee80211_set_default_key(sdata, idx, uni, multi); |
ad0e2b5a | 236 | mutex_unlock(&sdata->local->key_mtx); |
3b96766f JB |
237 | } |
238 | ||
3cfcf6ac JM |
239 | static void |
240 | __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx) | |
241 | { | |
242 | struct ieee80211_key *key = NULL; | |
243 | ||
ad0e2b5a JB |
244 | assert_key_lock(sdata->local); |
245 | ||
3cfcf6ac JM |
246 | if (idx >= NUM_DEFAULT_KEYS && |
247 | idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
40b275b6 | 248 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
3cfcf6ac JM |
249 | |
250 | rcu_assign_pointer(sdata->default_mgmt_key, key); | |
251 | ||
f7e0104c | 252 | ieee80211_debugfs_key_update_default(sdata); |
3cfcf6ac JM |
253 | } |
254 | ||
255 | void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, | |
256 | int idx) | |
257 | { | |
ad0e2b5a | 258 | mutex_lock(&sdata->local->key_mtx); |
3cfcf6ac | 259 | __ieee80211_set_default_mgmt_key(sdata, idx); |
ad0e2b5a | 260 | mutex_unlock(&sdata->local->key_mtx); |
3cfcf6ac JM |
261 | } |
262 | ||
3b96766f | 263 | |
3b8d9c29 JB |
264 | static void ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, |
265 | struct sta_info *sta, | |
266 | bool pairwise, | |
267 | struct ieee80211_key *old, | |
268 | struct ieee80211_key *new) | |
3b96766f | 269 | { |
f7e0104c JB |
270 | int idx; |
271 | bool defunikey, defmultikey, defmgmtkey; | |
3b96766f | 272 | |
5282c3ba JB |
273 | /* caller must provide at least one old/new */ |
274 | if (WARN_ON(!new && !old)) | |
275 | return; | |
276 | ||
3b96766f | 277 | if (new) |
f850e00f | 278 | list_add_tail(&new->list, &sdata->key_list); |
3b96766f | 279 | |
2475b1cc | 280 | WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx); |
3b96766f | 281 | |
2475b1cc MS |
282 | if (old) |
283 | idx = old->conf.keyidx; | |
284 | else | |
285 | idx = new->conf.keyidx; | |
3b96766f | 286 | |
2475b1cc MS |
287 | if (sta) { |
288 | if (pairwise) { | |
289 | rcu_assign_pointer(sta->ptk[idx], new); | |
290 | sta->ptk_idx = idx; | |
291 | } else { | |
292 | rcu_assign_pointer(sta->gtk[idx], new); | |
293 | sta->gtk_idx = idx; | |
294 | } | |
295 | } else { | |
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 | ||
2475b1cc MS |
329 | struct ieee80211_key * |
330 | ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, | |
331 | const u8 *key_data, | |
332 | size_t seq_len, const u8 *seq, | |
333 | const struct ieee80211_cipher_scheme *cs) | |
1f5a7e47 JB |
334 | { |
335 | struct ieee80211_key *key; | |
1ac62ba7 | 336 | int i, j, err; |
1f5a7e47 | 337 | |
8c5bb1fa JB |
338 | if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)) |
339 | return ERR_PTR(-EINVAL); | |
11a843b7 JB |
340 | |
341 | key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); | |
1f5a7e47 | 342 | if (!key) |
1ac62ba7 | 343 | return ERR_PTR(-ENOMEM); |
11a843b7 JB |
344 | |
345 | /* | |
346 | * Default to software encryption; we'll later upload the | |
347 | * key to the hardware if possible. | |
348 | */ | |
11a843b7 JB |
349 | key->conf.flags = 0; |
350 | key->flags = 0; | |
351 | ||
97359d12 | 352 | key->conf.cipher = cipher; |
11a843b7 JB |
353 | key->conf.keyidx = idx; |
354 | key->conf.keylen = key_len; | |
97359d12 JB |
355 | switch (cipher) { |
356 | case WLAN_CIPHER_SUITE_WEP40: | |
357 | case WLAN_CIPHER_SUITE_WEP104: | |
4325f6ca JB |
358 | key->conf.iv_len = IEEE80211_WEP_IV_LEN; |
359 | key->conf.icv_len = IEEE80211_WEP_ICV_LEN; | |
76708dee | 360 | break; |
97359d12 | 361 | case WLAN_CIPHER_SUITE_TKIP: |
4325f6ca JB |
362 | key->conf.iv_len = IEEE80211_TKIP_IV_LEN; |
363 | key->conf.icv_len = IEEE80211_TKIP_ICV_LEN; | |
9f26a952 | 364 | if (seq) { |
5a306f58 | 365 | for (i = 0; i < IEEE80211_NUM_TIDS; i++) { |
faa8fdc8 JM |
366 | key->u.tkip.rx[i].iv32 = |
367 | get_unaligned_le32(&seq[2]); | |
368 | key->u.tkip.rx[i].iv16 = | |
369 | get_unaligned_le16(seq); | |
370 | } | |
371 | } | |
523b02ea | 372 | spin_lock_init(&key->u.tkip.txlock); |
76708dee | 373 | break; |
97359d12 | 374 | case WLAN_CIPHER_SUITE_CCMP: |
4325f6ca JB |
375 | key->conf.iv_len = IEEE80211_CCMP_HDR_LEN; |
376 | key->conf.icv_len = IEEE80211_CCMP_MIC_LEN; | |
9f26a952 | 377 | if (seq) { |
5a306f58 | 378 | for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) |
4325f6ca | 379 | for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++) |
faa8fdc8 | 380 | key->u.ccmp.rx_pn[i][j] = |
4325f6ca | 381 | seq[IEEE80211_CCMP_PN_LEN - j - 1]; |
faa8fdc8 | 382 | } |
11a843b7 JB |
383 | /* |
384 | * Initialize AES key state here as an optimization so that | |
385 | * it does not need to be initialized for every packet. | |
386 | */ | |
387 | key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(key_data); | |
1ac62ba7 BH |
388 | if (IS_ERR(key->u.ccmp.tfm)) { |
389 | err = PTR_ERR(key->u.ccmp.tfm); | |
3b96766f | 390 | kfree(key); |
1f951a7f | 391 | return ERR_PTR(err); |
11a843b7 | 392 | } |
60ae0f20 JB |
393 | break; |
394 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
395 | key->conf.iv_len = 0; | |
396 | key->conf.icv_len = sizeof(struct ieee80211_mmie); | |
397 | if (seq) | |
4325f6ca | 398 | for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++) |
0f927323 | 399 | key->u.aes_cmac.rx_pn[j] = |
4325f6ca | 400 | seq[IEEE80211_CMAC_PN_LEN - 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; |
2475b1cc MS |
413 | default: |
414 | if (cs) { | |
415 | size_t len = (seq_len > MAX_PN_LEN) ? | |
416 | MAX_PN_LEN : seq_len; | |
417 | ||
418 | key->conf.iv_len = cs->hdr_len; | |
419 | key->conf.icv_len = cs->mic_len; | |
420 | for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) | |
421 | for (j = 0; j < len; j++) | |
422 | key->u.gen.rx_pn[i][j] = | |
423 | seq[len - j - 1]; | |
424 | } | |
3cfcf6ac | 425 | } |
60ae0f20 JB |
426 | memcpy(key->conf.key, key_data, key_len); |
427 | INIT_LIST_HEAD(&key->list); | |
3cfcf6ac | 428 | |
db4d1169 JB |
429 | return key; |
430 | } | |
11a843b7 | 431 | |
79cf2dfa JB |
432 | static void ieee80211_key_free_common(struct ieee80211_key *key) |
433 | { | |
434 | if (key->conf.cipher == WLAN_CIPHER_SUITE_CCMP) | |
435 | ieee80211_aes_key_free(key->u.ccmp.tfm); | |
436 | if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC) | |
437 | ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); | |
29c3f9c3 | 438 | kzfree(key); |
79cf2dfa JB |
439 | } |
440 | ||
6d10e46b JB |
441 | static void __ieee80211_key_destroy(struct ieee80211_key *key, |
442 | bool delay_tailroom) | |
ad0e2b5a | 443 | { |
32162a4d JM |
444 | if (key->local) |
445 | ieee80211_key_disable_hw_accel(key); | |
ad0e2b5a | 446 | |
3bff1865 | 447 | if (key->local) { |
8d1f7ecd JB |
448 | struct ieee80211_sub_if_data *sdata = key->sdata; |
449 | ||
32162a4d | 450 | ieee80211_debugfs_key_remove(key); |
8d1f7ecd JB |
451 | |
452 | if (delay_tailroom) { | |
453 | /* see ieee80211_delayed_tailroom_dec */ | |
454 | sdata->crypto_tx_tailroom_pending_dec++; | |
455 | schedule_delayed_work(&sdata->dec_tailroom_needed_wk, | |
456 | HZ/2); | |
457 | } else { | |
458 | sdata->crypto_tx_tailroom_needed_cnt--; | |
459 | } | |
3bff1865 | 460 | } |
ad0e2b5a | 461 | |
79cf2dfa JB |
462 | ieee80211_key_free_common(key); |
463 | } | |
464 | ||
6d10e46b JB |
465 | static void ieee80211_key_destroy(struct ieee80211_key *key, |
466 | bool delay_tailroom) | |
467 | { | |
468 | if (!key) | |
469 | return; | |
470 | ||
471 | /* | |
472 | * Synchronize so the TX path can no longer be using | |
473 | * this key before we free/remove it. | |
474 | */ | |
475 | synchronize_net(); | |
476 | ||
477 | __ieee80211_key_destroy(key, delay_tailroom); | |
478 | } | |
479 | ||
79cf2dfa JB |
480 | void ieee80211_key_free_unused(struct ieee80211_key *key) |
481 | { | |
482 | WARN_ON(key->sdata || key->local); | |
483 | ieee80211_key_free_common(key); | |
ad0e2b5a JB |
484 | } |
485 | ||
3ffc2a90 JB |
486 | int ieee80211_key_link(struct ieee80211_key *key, |
487 | struct ieee80211_sub_if_data *sdata, | |
488 | struct sta_info *sta) | |
db4d1169 | 489 | { |
27b3eb9c | 490 | struct ieee80211_local *local = sdata->local; |
db4d1169 | 491 | struct ieee80211_key *old_key; |
3ffc2a90 | 492 | int idx, ret; |
67aa030c | 493 | bool pairwise; |
db4d1169 | 494 | |
67aa030c | 495 | pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE; |
db4d1169 JB |
496 | idx = key->conf.keyidx; |
497 | key->local = sdata->local; | |
498 | key->sdata = sdata; | |
499 | key->sta = sta; | |
500 | ||
ad0e2b5a | 501 | mutex_lock(&sdata->local->key_mtx); |
3b96766f | 502 | |
e31b8213 | 503 | if (sta && pairwise) |
2475b1cc | 504 | old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]); |
e31b8213 | 505 | else if (sta) |
40b275b6 | 506 | old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]); |
d4e46a3d | 507 | else |
40b275b6 | 508 | old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
db4d1169 | 509 | |
3bff1865 YAP |
510 | increment_tailroom_need_count(sdata); |
511 | ||
3b8d9c29 JB |
512 | ieee80211_key_replace(sdata, sta, pairwise, old_key, key); |
513 | ieee80211_key_destroy(old_key, true); | |
d4e46a3d | 514 | |
ad0e2b5a | 515 | ieee80211_debugfs_key_add(key); |
db4d1169 | 516 | |
27b3eb9c JB |
517 | if (!local->wowlan) { |
518 | ret = ieee80211_key_enable_hw_accel(key); | |
519 | if (ret) | |
520 | ieee80211_key_free(key, true); | |
521 | } else { | |
522 | ret = 0; | |
523 | } | |
79cf2dfa | 524 | |
ad0e2b5a | 525 | mutex_unlock(&sdata->local->key_mtx); |
3ffc2a90 JB |
526 | |
527 | return ret; | |
1f5a7e47 JB |
528 | } |
529 | ||
3b8d9c29 | 530 | void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom) |
1f5a7e47 | 531 | { |
5c0c3641 JB |
532 | if (!key) |
533 | return; | |
534 | ||
3b96766f JB |
535 | /* |
536 | * Replace key with nothingness if it was ever used. | |
537 | */ | |
3a245766 | 538 | if (key->sdata) |
3b8d9c29 | 539 | ieee80211_key_replace(key->sdata, key->sta, |
e31b8213 JB |
540 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, |
541 | key, NULL); | |
3b8d9c29 | 542 | ieee80211_key_destroy(key, delay_tailroom); |
3b96766f | 543 | } |
d4e46a3d | 544 | |
ad0e2b5a | 545 | void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata) |
3a245766 JB |
546 | { |
547 | struct ieee80211_key *key; | |
11a843b7 | 548 | |
3a245766 | 549 | ASSERT_RTNL(); |
11a843b7 | 550 | |
9607e6b6 | 551 | if (WARN_ON(!ieee80211_sdata_running(sdata))) |
3a245766 | 552 | return; |
11a843b7 | 553 | |
ad0e2b5a | 554 | mutex_lock(&sdata->local->key_mtx); |
11a843b7 | 555 | |
3bff1865 YAP |
556 | sdata->crypto_tx_tailroom_needed_cnt = 0; |
557 | ||
558 | list_for_each_entry(key, &sdata->key_list, list) { | |
559 | increment_tailroom_need_count(sdata); | |
ad0e2b5a | 560 | ieee80211_key_enable_hw_accel(key); |
3bff1865 | 561 | } |
3b96766f | 562 | |
ad0e2b5a | 563 | mutex_unlock(&sdata->local->key_mtx); |
11a843b7 JB |
564 | } |
565 | ||
830af02f JB |
566 | void ieee80211_iter_keys(struct ieee80211_hw *hw, |
567 | struct ieee80211_vif *vif, | |
568 | void (*iter)(struct ieee80211_hw *hw, | |
569 | struct ieee80211_vif *vif, | |
570 | struct ieee80211_sta *sta, | |
571 | struct ieee80211_key_conf *key, | |
572 | void *data), | |
573 | void *iter_data) | |
574 | { | |
575 | struct ieee80211_local *local = hw_to_local(hw); | |
27b3eb9c | 576 | struct ieee80211_key *key, *tmp; |
830af02f JB |
577 | struct ieee80211_sub_if_data *sdata; |
578 | ||
579 | ASSERT_RTNL(); | |
580 | ||
581 | mutex_lock(&local->key_mtx); | |
582 | if (vif) { | |
583 | sdata = vif_to_sdata(vif); | |
27b3eb9c | 584 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) |
830af02f JB |
585 | iter(hw, &sdata->vif, |
586 | key->sta ? &key->sta->sta : NULL, | |
587 | &key->conf, iter_data); | |
588 | } else { | |
589 | list_for_each_entry(sdata, &local->interfaces, list) | |
27b3eb9c JB |
590 | list_for_each_entry_safe(key, tmp, |
591 | &sdata->key_list, list) | |
830af02f JB |
592 | iter(hw, &sdata->vif, |
593 | key->sta ? &key->sta->sta : NULL, | |
594 | &key->conf, iter_data); | |
595 | } | |
596 | mutex_unlock(&local->key_mtx); | |
597 | } | |
598 | EXPORT_SYMBOL(ieee80211_iter_keys); | |
599 | ||
7907c7d3 JB |
600 | static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata, |
601 | struct list_head *keys) | |
3b96766f JB |
602 | { |
603 | struct ieee80211_key *key, *tmp; | |
3b96766f | 604 | |
8d1f7ecd JB |
605 | sdata->crypto_tx_tailroom_needed_cnt -= |
606 | sdata->crypto_tx_tailroom_pending_dec; | |
607 | sdata->crypto_tx_tailroom_pending_dec = 0; | |
608 | ||
3cfcf6ac | 609 | ieee80211_debugfs_key_remove_mgmt_default(sdata); |
3b96766f | 610 | |
6d10e46b JB |
611 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) { |
612 | ieee80211_key_replace(key->sdata, key->sta, | |
613 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
614 | key, NULL); | |
7907c7d3 | 615 | list_add_tail(&key->list, keys); |
6d10e46b | 616 | } |
3b96766f | 617 | |
f7e0104c | 618 | ieee80211_debugfs_key_update_default(sdata); |
7907c7d3 | 619 | } |
f7e0104c | 620 | |
7907c7d3 JB |
621 | void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata, |
622 | bool force_synchronize) | |
623 | { | |
624 | struct ieee80211_local *local = sdata->local; | |
625 | struct ieee80211_sub_if_data *vlan; | |
626 | struct ieee80211_key *key, *tmp; | |
627 | LIST_HEAD(keys); | |
628 | ||
629 | cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk); | |
630 | ||
631 | mutex_lock(&local->key_mtx); | |
632 | ||
633 | ieee80211_free_keys_iface(sdata, &keys); | |
634 | ||
635 | if (sdata->vif.type == NL80211_IFTYPE_AP) { | |
636 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
637 | ieee80211_free_keys_iface(vlan, &keys); | |
6d10e46b JB |
638 | } |
639 | ||
7907c7d3 JB |
640 | if (!list_empty(&keys) || force_synchronize) |
641 | synchronize_net(); | |
642 | list_for_each_entry_safe(key, tmp, &keys, list) | |
643 | __ieee80211_key_destroy(key, false); | |
644 | ||
8d1f7ecd JB |
645 | WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || |
646 | sdata->crypto_tx_tailroom_pending_dec); | |
7907c7d3 JB |
647 | if (sdata->vif.type == NL80211_IFTYPE_AP) { |
648 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
649 | WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt || | |
650 | vlan->crypto_tx_tailroom_pending_dec); | |
651 | } | |
8d1f7ecd | 652 | |
7907c7d3 | 653 | mutex_unlock(&local->key_mtx); |
11a843b7 | 654 | } |
c68f4b89 | 655 | |
6d10e46b JB |
656 | void ieee80211_free_sta_keys(struct ieee80211_local *local, |
657 | struct sta_info *sta) | |
658 | { | |
c8782078 | 659 | struct ieee80211_key *key; |
6d10e46b JB |
660 | int i; |
661 | ||
662 | mutex_lock(&local->key_mtx); | |
28a9bc68 | 663 | for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) { |
6d10e46b JB |
664 | key = key_mtx_dereference(local, sta->gtk[i]); |
665 | if (!key) | |
666 | continue; | |
667 | ieee80211_key_replace(key->sdata, key->sta, | |
668 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
669 | key, NULL); | |
c8782078 | 670 | __ieee80211_key_destroy(key, true); |
6d10e46b JB |
671 | } |
672 | ||
2475b1cc MS |
673 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { |
674 | key = key_mtx_dereference(local, sta->ptk[i]); | |
675 | if (!key) | |
676 | continue; | |
6d10e46b JB |
677 | ieee80211_key_replace(key->sdata, key->sta, |
678 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
679 | key, NULL); | |
6d10e46b | 680 | __ieee80211_key_destroy(key, true); |
c8782078 | 681 | } |
6d10e46b JB |
682 | |
683 | mutex_unlock(&local->key_mtx); | |
684 | } | |
685 | ||
8d1f7ecd JB |
686 | void ieee80211_delayed_tailroom_dec(struct work_struct *wk) |
687 | { | |
688 | struct ieee80211_sub_if_data *sdata; | |
689 | ||
690 | sdata = container_of(wk, struct ieee80211_sub_if_data, | |
691 | dec_tailroom_needed_wk.work); | |
692 | ||
693 | /* | |
694 | * The reason for the delayed tailroom needed decrementing is to | |
695 | * make roaming faster: during roaming, all keys are first deleted | |
696 | * and then new keys are installed. The first new key causes the | |
697 | * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes | |
698 | * the cost of synchronize_net() (which can be slow). Avoid this | |
699 | * by deferring the crypto_tx_tailroom_needed_cnt decrementing on | |
700 | * key removal for a while, so if we roam the value is larger than | |
701 | * zero and no 0->1 transition happens. | |
702 | * | |
703 | * The cost is that if the AP switching was from an AP with keys | |
704 | * to one without, we still allocate tailroom while it would no | |
705 | * longer be needed. However, in the typical (fast) roaming case | |
706 | * within an ESS this usually won't happen. | |
707 | */ | |
708 | ||
709 | mutex_lock(&sdata->local->key_mtx); | |
710 | sdata->crypto_tx_tailroom_needed_cnt -= | |
711 | sdata->crypto_tx_tailroom_pending_dec; | |
712 | sdata->crypto_tx_tailroom_pending_dec = 0; | |
713 | mutex_unlock(&sdata->local->key_mtx); | |
714 | } | |
c68f4b89 JB |
715 | |
716 | void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid, | |
717 | const u8 *replay_ctr, gfp_t gfp) | |
718 | { | |
719 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
720 | ||
721 | trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr); | |
722 | ||
723 | cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp); | |
724 | } | |
725 | EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify); | |
3ea542d3 JB |
726 | |
727 | void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf, | |
728 | struct ieee80211_key_seq *seq) | |
729 | { | |
730 | struct ieee80211_key *key; | |
731 | u64 pn64; | |
732 | ||
733 | if (WARN_ON(!(keyconf->flags & IEEE80211_KEY_FLAG_GENERATE_IV))) | |
734 | return; | |
735 | ||
736 | key = container_of(keyconf, struct ieee80211_key, conf); | |
737 | ||
738 | switch (key->conf.cipher) { | |
739 | case WLAN_CIPHER_SUITE_TKIP: | |
740 | seq->tkip.iv32 = key->u.tkip.tx.iv32; | |
741 | seq->tkip.iv16 = key->u.tkip.tx.iv16; | |
742 | break; | |
743 | case WLAN_CIPHER_SUITE_CCMP: | |
744 | pn64 = atomic64_read(&key->u.ccmp.tx_pn); | |
745 | seq->ccmp.pn[5] = pn64; | |
746 | seq->ccmp.pn[4] = pn64 >> 8; | |
747 | seq->ccmp.pn[3] = pn64 >> 16; | |
748 | seq->ccmp.pn[2] = pn64 >> 24; | |
749 | seq->ccmp.pn[1] = pn64 >> 32; | |
750 | seq->ccmp.pn[0] = pn64 >> 40; | |
751 | break; | |
752 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
753 | pn64 = atomic64_read(&key->u.aes_cmac.tx_pn); | |
754 | seq->ccmp.pn[5] = pn64; | |
755 | seq->ccmp.pn[4] = pn64 >> 8; | |
756 | seq->ccmp.pn[3] = pn64 >> 16; | |
757 | seq->ccmp.pn[2] = pn64 >> 24; | |
758 | seq->ccmp.pn[1] = pn64 >> 32; | |
759 | seq->ccmp.pn[0] = pn64 >> 40; | |
760 | break; | |
761 | default: | |
762 | WARN_ON(1); | |
763 | } | |
764 | } | |
765 | EXPORT_SYMBOL(ieee80211_get_key_tx_seq); | |
766 | ||
767 | void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf, | |
768 | int tid, struct ieee80211_key_seq *seq) | |
769 | { | |
770 | struct ieee80211_key *key; | |
771 | const u8 *pn; | |
772 | ||
773 | key = container_of(keyconf, struct ieee80211_key, conf); | |
774 | ||
775 | switch (key->conf.cipher) { | |
776 | case WLAN_CIPHER_SUITE_TKIP: | |
5a306f58 | 777 | if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) |
3ea542d3 JB |
778 | return; |
779 | seq->tkip.iv32 = key->u.tkip.rx[tid].iv32; | |
780 | seq->tkip.iv16 = key->u.tkip.rx[tid].iv16; | |
781 | break; | |
782 | case WLAN_CIPHER_SUITE_CCMP: | |
5a306f58 | 783 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) |
3ea542d3 JB |
784 | return; |
785 | if (tid < 0) | |
5a306f58 | 786 | pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; |
3ea542d3 JB |
787 | else |
788 | pn = key->u.ccmp.rx_pn[tid]; | |
4325f6ca | 789 | memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN); |
3ea542d3 JB |
790 | break; |
791 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
792 | if (WARN_ON(tid != 0)) | |
793 | return; | |
794 | pn = key->u.aes_cmac.rx_pn; | |
4325f6ca | 795 | memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN); |
3ea542d3 JB |
796 | break; |
797 | } | |
798 | } | |
799 | EXPORT_SYMBOL(ieee80211_get_key_rx_seq); | |
27b3eb9c JB |
800 | |
801 | void ieee80211_set_key_tx_seq(struct ieee80211_key_conf *keyconf, | |
802 | struct ieee80211_key_seq *seq) | |
803 | { | |
804 | struct ieee80211_key *key; | |
805 | u64 pn64; | |
806 | ||
807 | key = container_of(keyconf, struct ieee80211_key, conf); | |
808 | ||
809 | switch (key->conf.cipher) { | |
810 | case WLAN_CIPHER_SUITE_TKIP: | |
811 | key->u.tkip.tx.iv32 = seq->tkip.iv32; | |
812 | key->u.tkip.tx.iv16 = seq->tkip.iv16; | |
813 | break; | |
814 | case WLAN_CIPHER_SUITE_CCMP: | |
815 | pn64 = (u64)seq->ccmp.pn[5] | | |
816 | ((u64)seq->ccmp.pn[4] << 8) | | |
817 | ((u64)seq->ccmp.pn[3] << 16) | | |
818 | ((u64)seq->ccmp.pn[2] << 24) | | |
819 | ((u64)seq->ccmp.pn[1] << 32) | | |
820 | ((u64)seq->ccmp.pn[0] << 40); | |
821 | atomic64_set(&key->u.ccmp.tx_pn, pn64); | |
822 | break; | |
823 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
824 | pn64 = (u64)seq->aes_cmac.pn[5] | | |
825 | ((u64)seq->aes_cmac.pn[4] << 8) | | |
826 | ((u64)seq->aes_cmac.pn[3] << 16) | | |
827 | ((u64)seq->aes_cmac.pn[2] << 24) | | |
828 | ((u64)seq->aes_cmac.pn[1] << 32) | | |
829 | ((u64)seq->aes_cmac.pn[0] << 40); | |
830 | atomic64_set(&key->u.aes_cmac.tx_pn, pn64); | |
831 | break; | |
832 | default: | |
833 | WARN_ON(1); | |
834 | break; | |
835 | } | |
836 | } | |
837 | EXPORT_SYMBOL_GPL(ieee80211_set_key_tx_seq); | |
838 | ||
839 | void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf, | |
840 | int tid, struct ieee80211_key_seq *seq) | |
841 | { | |
842 | struct ieee80211_key *key; | |
843 | u8 *pn; | |
844 | ||
845 | key = container_of(keyconf, struct ieee80211_key, conf); | |
846 | ||
847 | switch (key->conf.cipher) { | |
848 | case WLAN_CIPHER_SUITE_TKIP: | |
849 | if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) | |
850 | return; | |
851 | key->u.tkip.rx[tid].iv32 = seq->tkip.iv32; | |
852 | key->u.tkip.rx[tid].iv16 = seq->tkip.iv16; | |
853 | break; | |
854 | case WLAN_CIPHER_SUITE_CCMP: | |
855 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) | |
856 | return; | |
857 | if (tid < 0) | |
858 | pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; | |
859 | else | |
860 | pn = key->u.ccmp.rx_pn[tid]; | |
861 | memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN); | |
862 | break; | |
863 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
864 | if (WARN_ON(tid != 0)) | |
865 | return; | |
866 | pn = key->u.aes_cmac.rx_pn; | |
867 | memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN); | |
868 | break; | |
869 | default: | |
870 | WARN_ON(1); | |
871 | break; | |
872 | } | |
873 | } | |
874 | EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq); | |
875 | ||
876 | void ieee80211_remove_key(struct ieee80211_key_conf *keyconf) | |
877 | { | |
878 | struct ieee80211_key *key; | |
879 | ||
880 | key = container_of(keyconf, struct ieee80211_key, conf); | |
881 | ||
882 | assert_key_lock(key->local); | |
883 | ||
884 | /* | |
885 | * if key was uploaded, we assume the driver will/has remove(d) | |
886 | * it, so adjust bookkeeping accordingly | |
887 | */ | |
888 | if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { | |
889 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; | |
890 | ||
1e359a5d JB |
891 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
892 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) || | |
893 | (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))) | |
27b3eb9c JB |
894 | increment_tailroom_need_count(key->sdata); |
895 | } | |
896 | ||
897 | ieee80211_key_free(key, false); | |
898 | } | |
899 | EXPORT_SYMBOL_GPL(ieee80211_remove_key); | |
900 | ||
901 | struct ieee80211_key_conf * | |
902 | ieee80211_gtk_rekey_add(struct ieee80211_vif *vif, | |
903 | struct ieee80211_key_conf *keyconf) | |
904 | { | |
905 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
906 | struct ieee80211_local *local = sdata->local; | |
907 | struct ieee80211_key *key; | |
908 | int err; | |
909 | ||
910 | if (WARN_ON(!local->wowlan)) | |
911 | return ERR_PTR(-EINVAL); | |
912 | ||
913 | if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) | |
914 | return ERR_PTR(-EINVAL); | |
915 | ||
916 | key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx, | |
917 | keyconf->keylen, keyconf->key, | |
2475b1cc | 918 | 0, NULL, NULL); |
27b3eb9c | 919 | if (IS_ERR(key)) |
c5dc164d | 920 | return ERR_CAST(key); |
27b3eb9c JB |
921 | |
922 | if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED) | |
923 | key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT; | |
924 | ||
925 | err = ieee80211_key_link(key, sdata, NULL); | |
926 | if (err) | |
927 | return ERR_PTR(err); | |
928 | ||
929 | return &key->conf; | |
930 | } | |
931 | EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add); |