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" |
00b9cfa3 | 27 | #include "aes_gcm.h" |
1f5a7e47 | 28 | |
11a843b7 | 29 | |
dbbea671 JB |
30 | /** |
31 | * DOC: Key handling basics | |
11a843b7 JB |
32 | * |
33 | * Key handling in mac80211 is done based on per-interface (sub_if_data) | |
34 | * keys and per-station keys. Since each station belongs to an interface, | |
35 | * each station key also belongs to that interface. | |
36 | * | |
b5c34f66 JB |
37 | * Hardware acceleration is done on a best-effort basis for algorithms |
38 | * that are implemented in software, for each key the hardware is asked | |
39 | * to enable that key for offloading but if it cannot do that the key is | |
40 | * simply kept for software encryption (unless it is for an algorithm | |
41 | * that isn't implemented in software). | |
42 | * There is currently no way of knowing whether a key is handled in SW | |
43 | * or HW except by looking into debugfs. | |
11a843b7 | 44 | * |
b5c34f66 JB |
45 | * All key management is internally protected by a mutex. Within all |
46 | * other parts of mac80211, key references are, just as STA structure | |
47 | * references, protected by RCU. Note, however, that some things are | |
48 | * unprotected, namely the key->sta dereferences within the hardware | |
49 | * acceleration functions. This means that sta_info_destroy() must | |
50 | * remove the key which waits for an RCU grace period. | |
11a843b7 JB |
51 | */ |
52 | ||
53 | static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; | |
11a843b7 | 54 | |
ad0e2b5a | 55 | static void assert_key_lock(struct ieee80211_local *local) |
3b96766f | 56 | { |
46a5ebaf | 57 | lockdep_assert_held(&local->key_mtx); |
3b96766f JB |
58 | } |
59 | ||
3bff1865 YAP |
60 | static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata) |
61 | { | |
62 | /* | |
63 | * When this count is zero, SKB resizing for allocating tailroom | |
64 | * for IV or MMIC is skipped. But, this check has created two race | |
65 | * cases in xmit path while transiting from zero count to one: | |
66 | * | |
67 | * 1. SKB resize was skipped because no key was added but just before | |
68 | * the xmit key is added and SW encryption kicks off. | |
69 | * | |
70 | * 2. SKB resize was skipped because all the keys were hw planted but | |
71 | * just before xmit one of the key is deleted and SW encryption kicks | |
72 | * off. | |
73 | * | |
74 | * In both the above case SW encryption will find not enough space for | |
75 | * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c) | |
76 | * | |
77 | * Solution has been explained at | |
78 | * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net | |
79 | */ | |
80 | ||
81 | if (!sdata->crypto_tx_tailroom_needed_cnt++) { | |
82 | /* | |
83 | * Flush all XMIT packets currently using HW encryption or no | |
84 | * encryption at all if the count transition is from 0 -> 1. | |
85 | */ | |
86 | synchronize_net(); | |
87 | } | |
88 | } | |
89 | ||
3ffc2a90 | 90 | static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key) |
11a843b7 | 91 | { |
dc822b5d | 92 | struct ieee80211_sub_if_data *sdata; |
89c91cae | 93 | struct sta_info *sta; |
fa7e1fbc | 94 | int ret = -EOPNOTSUPP; |
11a843b7 | 95 | |
3b96766f JB |
96 | might_sleep(); |
97 | ||
4619194a JB |
98 | if (key->flags & KEY_FLAG_TAINTED) { |
99 | /* If we get here, it's during resume and the key is | |
100 | * tainted so shouldn't be used/programmed any more. | |
101 | * However, its flags may still indicate that it was | |
102 | * programmed into the device (since we're in resume) | |
103 | * so clear that flag now to avoid trying to remove | |
104 | * it again later. | |
105 | */ | |
106 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; | |
27b3eb9c | 107 | return -EINVAL; |
4619194a | 108 | } |
27b3eb9c | 109 | |
e31b8213 | 110 | if (!key->local->ops->set_key) |
3ffc2a90 | 111 | goto out_unsupported; |
11a843b7 | 112 | |
ad0e2b5a JB |
113 | assert_key_lock(key->local); |
114 | ||
89c91cae | 115 | sta = key->sta; |
dc822b5d | 116 | |
e31b8213 JB |
117 | /* |
118 | * If this is a per-STA GTK, check if it | |
119 | * is supported; if not, return. | |
120 | */ | |
121 | if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) && | |
122 | !(key->local->hw.flags & IEEE80211_HW_SUPPORTS_PER_STA_GTK)) | |
123 | goto out_unsupported; | |
124 | ||
89c91cae JB |
125 | if (sta && !sta->uploaded) |
126 | goto out_unsupported; | |
127 | ||
dc822b5d | 128 | sdata = key->sdata; |
18890d4b HS |
129 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { |
130 | /* | |
131 | * The driver doesn't know anything about VLAN interfaces. | |
132 | * Hence, don't send GTKs for VLAN interfaces to the driver. | |
133 | */ | |
134 | if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) | |
135 | goto out_unsupported; | |
18890d4b | 136 | } |
11a843b7 | 137 | |
89c91cae JB |
138 | ret = drv_set_key(key->local, SET_KEY, sdata, |
139 | sta ? &sta->sta : NULL, &key->conf); | |
11a843b7 | 140 | |
e31b8213 | 141 | if (!ret) { |
11a843b7 | 142 | key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; |
3bff1865 | 143 | |
1e359a5d | 144 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
db12847c | 145 | (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) |
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 | |
fa7e1fbc | 154 | if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1) |
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: | |
00b9cfa3 JM |
167 | case WLAN_CIPHER_SUITE_GCMP: |
168 | case WLAN_CIPHER_SUITE_GCMP_256: | |
fa7e1fbc JB |
169 | /* all of these we can do in software - if driver can */ |
170 | if (ret == 1) | |
171 | return 0; | |
172 | if (key->local->hw.flags & IEEE80211_HW_SW_CRYPTO_CONTROL) | |
173 | return -EINVAL; | |
e31b8213 JB |
174 | return 0; |
175 | default: | |
176 | return -EINVAL; | |
3ffc2a90 | 177 | } |
11a843b7 JB |
178 | } |
179 | ||
180 | static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key) | |
181 | { | |
dc822b5d | 182 | struct ieee80211_sub_if_data *sdata; |
89c91cae | 183 | struct sta_info *sta; |
11a843b7 JB |
184 | int ret; |
185 | ||
3b96766f JB |
186 | might_sleep(); |
187 | ||
db4d1169 | 188 | if (!key || !key->local->ops->set_key) |
11a843b7 JB |
189 | return; |
190 | ||
ad0e2b5a JB |
191 | assert_key_lock(key->local); |
192 | ||
193 | if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) | |
11a843b7 JB |
194 | return; |
195 | ||
89c91cae | 196 | sta = key->sta; |
dc822b5d JB |
197 | sdata = key->sdata; |
198 | ||
1e359a5d | 199 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
db12847c | 200 | (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) |
3bff1865 YAP |
201 | increment_tailroom_need_count(sdata); |
202 | ||
12375ef9 | 203 | ret = drv_set_key(key->local, DISABLE_KEY, sdata, |
89c91cae | 204 | sta ? &sta->sta : NULL, &key->conf); |
11a843b7 JB |
205 | |
206 | if (ret) | |
bdcbd8e0 | 207 | sdata_err(sdata, |
0fb9a9ec | 208 | "failed to remove key (%d, %pM) from hardware (%d)\n", |
89c91cae JB |
209 | key->conf.keyidx, |
210 | sta ? sta->sta.addr : bcast_addr, ret); | |
11a843b7 | 211 | |
3b96766f | 212 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; |
3b96766f JB |
213 | } |
214 | ||
215 | static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, | |
f7e0104c | 216 | int idx, bool uni, bool multi) |
3b96766f JB |
217 | { |
218 | struct ieee80211_key *key = NULL; | |
219 | ||
ad0e2b5a JB |
220 | assert_key_lock(sdata->local); |
221 | ||
3b96766f | 222 | if (idx >= 0 && idx < NUM_DEFAULT_KEYS) |
40b275b6 | 223 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
3b96766f | 224 | |
de5fad81 | 225 | if (uni) { |
f7e0104c | 226 | rcu_assign_pointer(sdata->default_unicast_key, key); |
de5fad81 YD |
227 | drv_set_default_unicast_key(sdata->local, sdata, idx); |
228 | } | |
229 | ||
f7e0104c JB |
230 | if (multi) |
231 | rcu_assign_pointer(sdata->default_multicast_key, key); | |
3b96766f | 232 | |
f7e0104c | 233 | ieee80211_debugfs_key_update_default(sdata); |
3b96766f JB |
234 | } |
235 | ||
f7e0104c JB |
236 | void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx, |
237 | bool uni, bool multi) | |
3b96766f | 238 | { |
ad0e2b5a | 239 | mutex_lock(&sdata->local->key_mtx); |
f7e0104c | 240 | __ieee80211_set_default_key(sdata, idx, uni, multi); |
ad0e2b5a | 241 | mutex_unlock(&sdata->local->key_mtx); |
3b96766f JB |
242 | } |
243 | ||
3cfcf6ac JM |
244 | static void |
245 | __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx) | |
246 | { | |
247 | struct ieee80211_key *key = NULL; | |
248 | ||
ad0e2b5a JB |
249 | assert_key_lock(sdata->local); |
250 | ||
3cfcf6ac JM |
251 | if (idx >= NUM_DEFAULT_KEYS && |
252 | idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
40b275b6 | 253 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
3cfcf6ac JM |
254 | |
255 | rcu_assign_pointer(sdata->default_mgmt_key, key); | |
256 | ||
f7e0104c | 257 | ieee80211_debugfs_key_update_default(sdata); |
3cfcf6ac JM |
258 | } |
259 | ||
260 | void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, | |
261 | int idx) | |
262 | { | |
ad0e2b5a | 263 | mutex_lock(&sdata->local->key_mtx); |
3cfcf6ac | 264 | __ieee80211_set_default_mgmt_key(sdata, idx); |
ad0e2b5a | 265 | mutex_unlock(&sdata->local->key_mtx); |
3cfcf6ac JM |
266 | } |
267 | ||
3b96766f | 268 | |
3b8d9c29 JB |
269 | static void ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, |
270 | struct sta_info *sta, | |
271 | bool pairwise, | |
272 | struct ieee80211_key *old, | |
273 | struct ieee80211_key *new) | |
3b96766f | 274 | { |
f7e0104c JB |
275 | int idx; |
276 | bool defunikey, defmultikey, defmgmtkey; | |
3b96766f | 277 | |
5282c3ba JB |
278 | /* caller must provide at least one old/new */ |
279 | if (WARN_ON(!new && !old)) | |
280 | return; | |
281 | ||
3b96766f | 282 | if (new) |
f850e00f | 283 | list_add_tail(&new->list, &sdata->key_list); |
3b96766f | 284 | |
2475b1cc | 285 | WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx); |
3b96766f | 286 | |
2475b1cc MS |
287 | if (old) |
288 | idx = old->conf.keyidx; | |
289 | else | |
290 | idx = new->conf.keyidx; | |
3b96766f | 291 | |
2475b1cc MS |
292 | if (sta) { |
293 | if (pairwise) { | |
294 | rcu_assign_pointer(sta->ptk[idx], new); | |
295 | sta->ptk_idx = idx; | |
296 | } else { | |
297 | rcu_assign_pointer(sta->gtk[idx], new); | |
298 | sta->gtk_idx = idx; | |
299 | } | |
300 | } else { | |
40b275b6 JB |
301 | defunikey = old && |
302 | old == key_mtx_dereference(sdata->local, | |
303 | sdata->default_unicast_key); | |
304 | defmultikey = old && | |
305 | old == key_mtx_dereference(sdata->local, | |
306 | sdata->default_multicast_key); | |
307 | defmgmtkey = old && | |
308 | old == key_mtx_dereference(sdata->local, | |
309 | sdata->default_mgmt_key); | |
3b96766f | 310 | |
f7e0104c JB |
311 | if (defunikey && !new) |
312 | __ieee80211_set_default_key(sdata, -1, true, false); | |
313 | if (defmultikey && !new) | |
314 | __ieee80211_set_default_key(sdata, -1, false, true); | |
3cfcf6ac JM |
315 | if (defmgmtkey && !new) |
316 | __ieee80211_set_default_mgmt_key(sdata, -1); | |
3b96766f JB |
317 | |
318 | rcu_assign_pointer(sdata->keys[idx], new); | |
f7e0104c JB |
319 | if (defunikey && new) |
320 | __ieee80211_set_default_key(sdata, new->conf.keyidx, | |
321 | true, false); | |
322 | if (defmultikey && new) | |
323 | __ieee80211_set_default_key(sdata, new->conf.keyidx, | |
324 | false, true); | |
3cfcf6ac JM |
325 | if (defmgmtkey && new) |
326 | __ieee80211_set_default_mgmt_key(sdata, | |
327 | new->conf.keyidx); | |
3b96766f JB |
328 | } |
329 | ||
b5c34f66 JB |
330 | if (old) |
331 | list_del(&old->list); | |
11a843b7 JB |
332 | } |
333 | ||
2475b1cc MS |
334 | struct ieee80211_key * |
335 | ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, | |
336 | const u8 *key_data, | |
337 | size_t seq_len, const u8 *seq, | |
338 | const struct ieee80211_cipher_scheme *cs) | |
1f5a7e47 JB |
339 | { |
340 | struct ieee80211_key *key; | |
1ac62ba7 | 341 | int i, j, err; |
1f5a7e47 | 342 | |
8c5bb1fa JB |
343 | if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)) |
344 | return ERR_PTR(-EINVAL); | |
11a843b7 JB |
345 | |
346 | key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); | |
1f5a7e47 | 347 | if (!key) |
1ac62ba7 | 348 | return ERR_PTR(-ENOMEM); |
11a843b7 JB |
349 | |
350 | /* | |
351 | * Default to software encryption; we'll later upload the | |
352 | * key to the hardware if possible. | |
353 | */ | |
11a843b7 JB |
354 | key->conf.flags = 0; |
355 | key->flags = 0; | |
356 | ||
97359d12 | 357 | key->conf.cipher = cipher; |
11a843b7 JB |
358 | key->conf.keyidx = idx; |
359 | key->conf.keylen = key_len; | |
97359d12 JB |
360 | switch (cipher) { |
361 | case WLAN_CIPHER_SUITE_WEP40: | |
362 | case WLAN_CIPHER_SUITE_WEP104: | |
4325f6ca JB |
363 | key->conf.iv_len = IEEE80211_WEP_IV_LEN; |
364 | key->conf.icv_len = IEEE80211_WEP_ICV_LEN; | |
76708dee | 365 | break; |
97359d12 | 366 | case WLAN_CIPHER_SUITE_TKIP: |
4325f6ca JB |
367 | key->conf.iv_len = IEEE80211_TKIP_IV_LEN; |
368 | key->conf.icv_len = IEEE80211_TKIP_ICV_LEN; | |
9f26a952 | 369 | if (seq) { |
5a306f58 | 370 | for (i = 0; i < IEEE80211_NUM_TIDS; i++) { |
faa8fdc8 JM |
371 | key->u.tkip.rx[i].iv32 = |
372 | get_unaligned_le32(&seq[2]); | |
373 | key->u.tkip.rx[i].iv16 = | |
374 | get_unaligned_le16(seq); | |
375 | } | |
376 | } | |
523b02ea | 377 | spin_lock_init(&key->u.tkip.txlock); |
76708dee | 378 | break; |
97359d12 | 379 | case WLAN_CIPHER_SUITE_CCMP: |
4325f6ca JB |
380 | key->conf.iv_len = IEEE80211_CCMP_HDR_LEN; |
381 | key->conf.icv_len = IEEE80211_CCMP_MIC_LEN; | |
9f26a952 | 382 | if (seq) { |
5a306f58 | 383 | for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) |
4325f6ca | 384 | for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++) |
faa8fdc8 | 385 | key->u.ccmp.rx_pn[i][j] = |
4325f6ca | 386 | seq[IEEE80211_CCMP_PN_LEN - j - 1]; |
faa8fdc8 | 387 | } |
11a843b7 JB |
388 | /* |
389 | * Initialize AES key state here as an optimization so that | |
390 | * it does not need to be initialized for every packet. | |
391 | */ | |
392 | key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(key_data); | |
1ac62ba7 BH |
393 | if (IS_ERR(key->u.ccmp.tfm)) { |
394 | err = PTR_ERR(key->u.ccmp.tfm); | |
3b96766f | 395 | kfree(key); |
1f951a7f | 396 | return ERR_PTR(err); |
11a843b7 | 397 | } |
60ae0f20 JB |
398 | break; |
399 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
400 | key->conf.iv_len = 0; | |
401 | key->conf.icv_len = sizeof(struct ieee80211_mmie); | |
402 | if (seq) | |
4325f6ca | 403 | for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++) |
0f927323 | 404 | key->u.aes_cmac.rx_pn[j] = |
4325f6ca | 405 | seq[IEEE80211_CMAC_PN_LEN - j - 1]; |
3cfcf6ac JM |
406 | /* |
407 | * Initialize AES key state here as an optimization so that | |
408 | * it does not need to be initialized for every packet. | |
409 | */ | |
410 | key->u.aes_cmac.tfm = | |
411 | ieee80211_aes_cmac_key_setup(key_data); | |
1ac62ba7 BH |
412 | if (IS_ERR(key->u.aes_cmac.tfm)) { |
413 | err = PTR_ERR(key->u.aes_cmac.tfm); | |
3cfcf6ac | 414 | kfree(key); |
1f951a7f | 415 | return ERR_PTR(err); |
3cfcf6ac | 416 | } |
60ae0f20 | 417 | break; |
00b9cfa3 JM |
418 | case WLAN_CIPHER_SUITE_GCMP: |
419 | case WLAN_CIPHER_SUITE_GCMP_256: | |
420 | key->conf.iv_len = IEEE80211_GCMP_HDR_LEN; | |
421 | key->conf.icv_len = IEEE80211_GCMP_MIC_LEN; | |
422 | for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++) | |
423 | for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++) | |
424 | key->u.gcmp.rx_pn[i][j] = | |
425 | seq[IEEE80211_GCMP_PN_LEN - j - 1]; | |
426 | /* Initialize AES key state here as an optimization so that | |
427 | * it does not need to be initialized for every packet. | |
428 | */ | |
429 | key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data, | |
430 | key_len); | |
431 | if (IS_ERR(key->u.gcmp.tfm)) { | |
432 | err = PTR_ERR(key->u.gcmp.tfm); | |
433 | kfree(key); | |
434 | return ERR_PTR(err); | |
435 | } | |
436 | break; | |
2475b1cc MS |
437 | default: |
438 | if (cs) { | |
439 | size_t len = (seq_len > MAX_PN_LEN) ? | |
440 | MAX_PN_LEN : seq_len; | |
441 | ||
442 | key->conf.iv_len = cs->hdr_len; | |
443 | key->conf.icv_len = cs->mic_len; | |
444 | for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) | |
445 | for (j = 0; j < len; j++) | |
446 | key->u.gen.rx_pn[i][j] = | |
447 | seq[len - j - 1]; | |
448 | } | |
3cfcf6ac | 449 | } |
60ae0f20 JB |
450 | memcpy(key->conf.key, key_data, key_len); |
451 | INIT_LIST_HEAD(&key->list); | |
3cfcf6ac | 452 | |
db4d1169 JB |
453 | return key; |
454 | } | |
11a843b7 | 455 | |
79cf2dfa JB |
456 | static void ieee80211_key_free_common(struct ieee80211_key *key) |
457 | { | |
00b9cfa3 JM |
458 | switch (key->conf.cipher) { |
459 | case WLAN_CIPHER_SUITE_CCMP: | |
79cf2dfa | 460 | ieee80211_aes_key_free(key->u.ccmp.tfm); |
00b9cfa3 JM |
461 | break; |
462 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
79cf2dfa | 463 | ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); |
00b9cfa3 JM |
464 | break; |
465 | case WLAN_CIPHER_SUITE_GCMP: | |
466 | case WLAN_CIPHER_SUITE_GCMP_256: | |
467 | ieee80211_aes_gcm_key_free(key->u.gcmp.tfm); | |
468 | break; | |
469 | } | |
29c3f9c3 | 470 | kzfree(key); |
79cf2dfa JB |
471 | } |
472 | ||
6d10e46b JB |
473 | static void __ieee80211_key_destroy(struct ieee80211_key *key, |
474 | bool delay_tailroom) | |
ad0e2b5a | 475 | { |
32162a4d JM |
476 | if (key->local) |
477 | ieee80211_key_disable_hw_accel(key); | |
ad0e2b5a | 478 | |
3bff1865 | 479 | if (key->local) { |
8d1f7ecd JB |
480 | struct ieee80211_sub_if_data *sdata = key->sdata; |
481 | ||
32162a4d | 482 | ieee80211_debugfs_key_remove(key); |
8d1f7ecd JB |
483 | |
484 | if (delay_tailroom) { | |
485 | /* see ieee80211_delayed_tailroom_dec */ | |
486 | sdata->crypto_tx_tailroom_pending_dec++; | |
487 | schedule_delayed_work(&sdata->dec_tailroom_needed_wk, | |
488 | HZ/2); | |
489 | } else { | |
490 | sdata->crypto_tx_tailroom_needed_cnt--; | |
491 | } | |
3bff1865 | 492 | } |
ad0e2b5a | 493 | |
79cf2dfa JB |
494 | ieee80211_key_free_common(key); |
495 | } | |
496 | ||
6d10e46b JB |
497 | static void ieee80211_key_destroy(struct ieee80211_key *key, |
498 | bool delay_tailroom) | |
499 | { | |
500 | if (!key) | |
501 | return; | |
502 | ||
503 | /* | |
504 | * Synchronize so the TX path can no longer be using | |
505 | * this key before we free/remove it. | |
506 | */ | |
507 | synchronize_net(); | |
508 | ||
509 | __ieee80211_key_destroy(key, delay_tailroom); | |
510 | } | |
511 | ||
79cf2dfa JB |
512 | void ieee80211_key_free_unused(struct ieee80211_key *key) |
513 | { | |
514 | WARN_ON(key->sdata || key->local); | |
515 | ieee80211_key_free_common(key); | |
ad0e2b5a JB |
516 | } |
517 | ||
3ffc2a90 JB |
518 | int ieee80211_key_link(struct ieee80211_key *key, |
519 | struct ieee80211_sub_if_data *sdata, | |
520 | struct sta_info *sta) | |
db4d1169 | 521 | { |
27b3eb9c | 522 | struct ieee80211_local *local = sdata->local; |
db4d1169 | 523 | struct ieee80211_key *old_key; |
3ffc2a90 | 524 | int idx, ret; |
67aa030c | 525 | bool pairwise; |
db4d1169 | 526 | |
67aa030c | 527 | pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE; |
db4d1169 JB |
528 | idx = key->conf.keyidx; |
529 | key->local = sdata->local; | |
530 | key->sdata = sdata; | |
531 | key->sta = sta; | |
532 | ||
ad0e2b5a | 533 | mutex_lock(&sdata->local->key_mtx); |
3b96766f | 534 | |
e31b8213 | 535 | if (sta && pairwise) |
2475b1cc | 536 | old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]); |
e31b8213 | 537 | else if (sta) |
40b275b6 | 538 | old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]); |
d4e46a3d | 539 | else |
40b275b6 | 540 | old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
db4d1169 | 541 | |
3bff1865 YAP |
542 | increment_tailroom_need_count(sdata); |
543 | ||
3b8d9c29 JB |
544 | ieee80211_key_replace(sdata, sta, pairwise, old_key, key); |
545 | ieee80211_key_destroy(old_key, true); | |
d4e46a3d | 546 | |
ad0e2b5a | 547 | ieee80211_debugfs_key_add(key); |
db4d1169 | 548 | |
27b3eb9c JB |
549 | if (!local->wowlan) { |
550 | ret = ieee80211_key_enable_hw_accel(key); | |
551 | if (ret) | |
552 | ieee80211_key_free(key, true); | |
553 | } else { | |
554 | ret = 0; | |
555 | } | |
79cf2dfa | 556 | |
ad0e2b5a | 557 | mutex_unlock(&sdata->local->key_mtx); |
3ffc2a90 JB |
558 | |
559 | return ret; | |
1f5a7e47 JB |
560 | } |
561 | ||
3b8d9c29 | 562 | void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom) |
1f5a7e47 | 563 | { |
5c0c3641 JB |
564 | if (!key) |
565 | return; | |
566 | ||
3b96766f JB |
567 | /* |
568 | * Replace key with nothingness if it was ever used. | |
569 | */ | |
3a245766 | 570 | if (key->sdata) |
3b8d9c29 | 571 | ieee80211_key_replace(key->sdata, key->sta, |
e31b8213 JB |
572 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, |
573 | key, NULL); | |
3b8d9c29 | 574 | ieee80211_key_destroy(key, delay_tailroom); |
3b96766f | 575 | } |
d4e46a3d | 576 | |
ad0e2b5a | 577 | void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata) |
3a245766 JB |
578 | { |
579 | struct ieee80211_key *key; | |
11a843b7 | 580 | |
3a245766 | 581 | ASSERT_RTNL(); |
11a843b7 | 582 | |
9607e6b6 | 583 | if (WARN_ON(!ieee80211_sdata_running(sdata))) |
3a245766 | 584 | return; |
11a843b7 | 585 | |
ad0e2b5a | 586 | mutex_lock(&sdata->local->key_mtx); |
11a843b7 | 587 | |
3bff1865 YAP |
588 | sdata->crypto_tx_tailroom_needed_cnt = 0; |
589 | ||
590 | list_for_each_entry(key, &sdata->key_list, list) { | |
591 | increment_tailroom_need_count(sdata); | |
ad0e2b5a | 592 | ieee80211_key_enable_hw_accel(key); |
3bff1865 | 593 | } |
3b96766f | 594 | |
ad0e2b5a | 595 | mutex_unlock(&sdata->local->key_mtx); |
11a843b7 JB |
596 | } |
597 | ||
830af02f JB |
598 | void ieee80211_iter_keys(struct ieee80211_hw *hw, |
599 | struct ieee80211_vif *vif, | |
600 | void (*iter)(struct ieee80211_hw *hw, | |
601 | struct ieee80211_vif *vif, | |
602 | struct ieee80211_sta *sta, | |
603 | struct ieee80211_key_conf *key, | |
604 | void *data), | |
605 | void *iter_data) | |
606 | { | |
607 | struct ieee80211_local *local = hw_to_local(hw); | |
27b3eb9c | 608 | struct ieee80211_key *key, *tmp; |
830af02f JB |
609 | struct ieee80211_sub_if_data *sdata; |
610 | ||
611 | ASSERT_RTNL(); | |
612 | ||
613 | mutex_lock(&local->key_mtx); | |
614 | if (vif) { | |
615 | sdata = vif_to_sdata(vif); | |
27b3eb9c | 616 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) |
830af02f JB |
617 | iter(hw, &sdata->vif, |
618 | key->sta ? &key->sta->sta : NULL, | |
619 | &key->conf, iter_data); | |
620 | } else { | |
621 | list_for_each_entry(sdata, &local->interfaces, list) | |
27b3eb9c JB |
622 | list_for_each_entry_safe(key, tmp, |
623 | &sdata->key_list, list) | |
830af02f JB |
624 | iter(hw, &sdata->vif, |
625 | key->sta ? &key->sta->sta : NULL, | |
626 | &key->conf, iter_data); | |
627 | } | |
628 | mutex_unlock(&local->key_mtx); | |
629 | } | |
630 | EXPORT_SYMBOL(ieee80211_iter_keys); | |
631 | ||
7907c7d3 JB |
632 | static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata, |
633 | struct list_head *keys) | |
3b96766f JB |
634 | { |
635 | struct ieee80211_key *key, *tmp; | |
3b96766f | 636 | |
8d1f7ecd JB |
637 | sdata->crypto_tx_tailroom_needed_cnt -= |
638 | sdata->crypto_tx_tailroom_pending_dec; | |
639 | sdata->crypto_tx_tailroom_pending_dec = 0; | |
640 | ||
3cfcf6ac | 641 | ieee80211_debugfs_key_remove_mgmt_default(sdata); |
3b96766f | 642 | |
6d10e46b JB |
643 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) { |
644 | ieee80211_key_replace(key->sdata, key->sta, | |
645 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
646 | key, NULL); | |
7907c7d3 | 647 | list_add_tail(&key->list, keys); |
6d10e46b | 648 | } |
3b96766f | 649 | |
f7e0104c | 650 | ieee80211_debugfs_key_update_default(sdata); |
7907c7d3 | 651 | } |
f7e0104c | 652 | |
7907c7d3 JB |
653 | void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata, |
654 | bool force_synchronize) | |
655 | { | |
656 | struct ieee80211_local *local = sdata->local; | |
657 | struct ieee80211_sub_if_data *vlan; | |
658 | struct ieee80211_key *key, *tmp; | |
659 | LIST_HEAD(keys); | |
660 | ||
661 | cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk); | |
662 | ||
663 | mutex_lock(&local->key_mtx); | |
664 | ||
665 | ieee80211_free_keys_iface(sdata, &keys); | |
666 | ||
667 | if (sdata->vif.type == NL80211_IFTYPE_AP) { | |
668 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
669 | ieee80211_free_keys_iface(vlan, &keys); | |
6d10e46b JB |
670 | } |
671 | ||
7907c7d3 JB |
672 | if (!list_empty(&keys) || force_synchronize) |
673 | synchronize_net(); | |
674 | list_for_each_entry_safe(key, tmp, &keys, list) | |
675 | __ieee80211_key_destroy(key, false); | |
676 | ||
8d1f7ecd JB |
677 | WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || |
678 | sdata->crypto_tx_tailroom_pending_dec); | |
7907c7d3 JB |
679 | if (sdata->vif.type == NL80211_IFTYPE_AP) { |
680 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
681 | WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt || | |
682 | vlan->crypto_tx_tailroom_pending_dec); | |
683 | } | |
8d1f7ecd | 684 | |
7907c7d3 | 685 | mutex_unlock(&local->key_mtx); |
11a843b7 | 686 | } |
c68f4b89 | 687 | |
6d10e46b JB |
688 | void ieee80211_free_sta_keys(struct ieee80211_local *local, |
689 | struct sta_info *sta) | |
690 | { | |
c8782078 | 691 | struct ieee80211_key *key; |
6d10e46b JB |
692 | int i; |
693 | ||
694 | mutex_lock(&local->key_mtx); | |
28a9bc68 | 695 | for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) { |
6d10e46b JB |
696 | key = key_mtx_dereference(local, sta->gtk[i]); |
697 | if (!key) | |
698 | continue; | |
699 | ieee80211_key_replace(key->sdata, key->sta, | |
700 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
701 | key, NULL); | |
c8782078 | 702 | __ieee80211_key_destroy(key, true); |
6d10e46b JB |
703 | } |
704 | ||
2475b1cc MS |
705 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { |
706 | key = key_mtx_dereference(local, sta->ptk[i]); | |
707 | if (!key) | |
708 | continue; | |
6d10e46b JB |
709 | ieee80211_key_replace(key->sdata, key->sta, |
710 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
711 | key, NULL); | |
6d10e46b | 712 | __ieee80211_key_destroy(key, true); |
c8782078 | 713 | } |
6d10e46b JB |
714 | |
715 | mutex_unlock(&local->key_mtx); | |
716 | } | |
717 | ||
8d1f7ecd JB |
718 | void ieee80211_delayed_tailroom_dec(struct work_struct *wk) |
719 | { | |
720 | struct ieee80211_sub_if_data *sdata; | |
721 | ||
722 | sdata = container_of(wk, struct ieee80211_sub_if_data, | |
723 | dec_tailroom_needed_wk.work); | |
724 | ||
725 | /* | |
726 | * The reason for the delayed tailroom needed decrementing is to | |
727 | * make roaming faster: during roaming, all keys are first deleted | |
728 | * and then new keys are installed. The first new key causes the | |
729 | * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes | |
730 | * the cost of synchronize_net() (which can be slow). Avoid this | |
731 | * by deferring the crypto_tx_tailroom_needed_cnt decrementing on | |
732 | * key removal for a while, so if we roam the value is larger than | |
733 | * zero and no 0->1 transition happens. | |
734 | * | |
735 | * The cost is that if the AP switching was from an AP with keys | |
736 | * to one without, we still allocate tailroom while it would no | |
737 | * longer be needed. However, in the typical (fast) roaming case | |
738 | * within an ESS this usually won't happen. | |
739 | */ | |
740 | ||
741 | mutex_lock(&sdata->local->key_mtx); | |
742 | sdata->crypto_tx_tailroom_needed_cnt -= | |
743 | sdata->crypto_tx_tailroom_pending_dec; | |
744 | sdata->crypto_tx_tailroom_pending_dec = 0; | |
745 | mutex_unlock(&sdata->local->key_mtx); | |
746 | } | |
c68f4b89 JB |
747 | |
748 | void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid, | |
749 | const u8 *replay_ctr, gfp_t gfp) | |
750 | { | |
751 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
752 | ||
753 | trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr); | |
754 | ||
755 | cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp); | |
756 | } | |
757 | EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify); | |
3ea542d3 JB |
758 | |
759 | void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf, | |
760 | struct ieee80211_key_seq *seq) | |
761 | { | |
762 | struct ieee80211_key *key; | |
763 | u64 pn64; | |
764 | ||
765 | if (WARN_ON(!(keyconf->flags & IEEE80211_KEY_FLAG_GENERATE_IV))) | |
766 | return; | |
767 | ||
768 | key = container_of(keyconf, struct ieee80211_key, conf); | |
769 | ||
770 | switch (key->conf.cipher) { | |
771 | case WLAN_CIPHER_SUITE_TKIP: | |
772 | seq->tkip.iv32 = key->u.tkip.tx.iv32; | |
773 | seq->tkip.iv16 = key->u.tkip.tx.iv16; | |
774 | break; | |
775 | case WLAN_CIPHER_SUITE_CCMP: | |
776 | pn64 = atomic64_read(&key->u.ccmp.tx_pn); | |
777 | seq->ccmp.pn[5] = pn64; | |
778 | seq->ccmp.pn[4] = pn64 >> 8; | |
779 | seq->ccmp.pn[3] = pn64 >> 16; | |
780 | seq->ccmp.pn[2] = pn64 >> 24; | |
781 | seq->ccmp.pn[1] = pn64 >> 32; | |
782 | seq->ccmp.pn[0] = pn64 >> 40; | |
783 | break; | |
784 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
785 | pn64 = atomic64_read(&key->u.aes_cmac.tx_pn); | |
786 | seq->ccmp.pn[5] = pn64; | |
787 | seq->ccmp.pn[4] = pn64 >> 8; | |
788 | seq->ccmp.pn[3] = pn64 >> 16; | |
789 | seq->ccmp.pn[2] = pn64 >> 24; | |
790 | seq->ccmp.pn[1] = pn64 >> 32; | |
791 | seq->ccmp.pn[0] = pn64 >> 40; | |
792 | break; | |
00b9cfa3 JM |
793 | case WLAN_CIPHER_SUITE_GCMP: |
794 | case WLAN_CIPHER_SUITE_GCMP_256: | |
795 | pn64 = atomic64_read(&key->u.gcmp.tx_pn); | |
796 | seq->gcmp.pn[5] = pn64; | |
797 | seq->gcmp.pn[4] = pn64 >> 8; | |
798 | seq->gcmp.pn[3] = pn64 >> 16; | |
799 | seq->gcmp.pn[2] = pn64 >> 24; | |
800 | seq->gcmp.pn[1] = pn64 >> 32; | |
801 | seq->gcmp.pn[0] = pn64 >> 40; | |
802 | break; | |
3ea542d3 JB |
803 | default: |
804 | WARN_ON(1); | |
805 | } | |
806 | } | |
807 | EXPORT_SYMBOL(ieee80211_get_key_tx_seq); | |
808 | ||
809 | void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf, | |
810 | int tid, struct ieee80211_key_seq *seq) | |
811 | { | |
812 | struct ieee80211_key *key; | |
813 | const u8 *pn; | |
814 | ||
815 | key = container_of(keyconf, struct ieee80211_key, conf); | |
816 | ||
817 | switch (key->conf.cipher) { | |
818 | case WLAN_CIPHER_SUITE_TKIP: | |
5a306f58 | 819 | if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) |
3ea542d3 JB |
820 | return; |
821 | seq->tkip.iv32 = key->u.tkip.rx[tid].iv32; | |
822 | seq->tkip.iv16 = key->u.tkip.rx[tid].iv16; | |
823 | break; | |
824 | case WLAN_CIPHER_SUITE_CCMP: | |
5a306f58 | 825 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) |
3ea542d3 JB |
826 | return; |
827 | if (tid < 0) | |
5a306f58 | 828 | pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; |
3ea542d3 JB |
829 | else |
830 | pn = key->u.ccmp.rx_pn[tid]; | |
4325f6ca | 831 | memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN); |
3ea542d3 JB |
832 | break; |
833 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
834 | if (WARN_ON(tid != 0)) | |
835 | return; | |
836 | pn = key->u.aes_cmac.rx_pn; | |
4325f6ca | 837 | memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN); |
3ea542d3 | 838 | break; |
00b9cfa3 JM |
839 | case WLAN_CIPHER_SUITE_GCMP: |
840 | case WLAN_CIPHER_SUITE_GCMP_256: | |
841 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) | |
842 | return; | |
843 | if (tid < 0) | |
844 | pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; | |
845 | else | |
846 | pn = key->u.gcmp.rx_pn[tid]; | |
847 | memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN); | |
848 | break; | |
3ea542d3 JB |
849 | } |
850 | } | |
851 | EXPORT_SYMBOL(ieee80211_get_key_rx_seq); | |
27b3eb9c JB |
852 | |
853 | void ieee80211_set_key_tx_seq(struct ieee80211_key_conf *keyconf, | |
854 | struct ieee80211_key_seq *seq) | |
855 | { | |
856 | struct ieee80211_key *key; | |
857 | u64 pn64; | |
858 | ||
859 | key = container_of(keyconf, struct ieee80211_key, conf); | |
860 | ||
861 | switch (key->conf.cipher) { | |
862 | case WLAN_CIPHER_SUITE_TKIP: | |
863 | key->u.tkip.tx.iv32 = seq->tkip.iv32; | |
864 | key->u.tkip.tx.iv16 = seq->tkip.iv16; | |
865 | break; | |
866 | case WLAN_CIPHER_SUITE_CCMP: | |
867 | pn64 = (u64)seq->ccmp.pn[5] | | |
868 | ((u64)seq->ccmp.pn[4] << 8) | | |
869 | ((u64)seq->ccmp.pn[3] << 16) | | |
870 | ((u64)seq->ccmp.pn[2] << 24) | | |
871 | ((u64)seq->ccmp.pn[1] << 32) | | |
872 | ((u64)seq->ccmp.pn[0] << 40); | |
873 | atomic64_set(&key->u.ccmp.tx_pn, pn64); | |
874 | break; | |
875 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
876 | pn64 = (u64)seq->aes_cmac.pn[5] | | |
877 | ((u64)seq->aes_cmac.pn[4] << 8) | | |
878 | ((u64)seq->aes_cmac.pn[3] << 16) | | |
879 | ((u64)seq->aes_cmac.pn[2] << 24) | | |
880 | ((u64)seq->aes_cmac.pn[1] << 32) | | |
881 | ((u64)seq->aes_cmac.pn[0] << 40); | |
882 | atomic64_set(&key->u.aes_cmac.tx_pn, pn64); | |
883 | break; | |
00b9cfa3 JM |
884 | case WLAN_CIPHER_SUITE_GCMP: |
885 | case WLAN_CIPHER_SUITE_GCMP_256: | |
886 | pn64 = (u64)seq->gcmp.pn[5] | | |
887 | ((u64)seq->gcmp.pn[4] << 8) | | |
888 | ((u64)seq->gcmp.pn[3] << 16) | | |
889 | ((u64)seq->gcmp.pn[2] << 24) | | |
890 | ((u64)seq->gcmp.pn[1] << 32) | | |
891 | ((u64)seq->gcmp.pn[0] << 40); | |
892 | atomic64_set(&key->u.gcmp.tx_pn, pn64); | |
893 | break; | |
27b3eb9c JB |
894 | default: |
895 | WARN_ON(1); | |
896 | break; | |
897 | } | |
898 | } | |
899 | EXPORT_SYMBOL_GPL(ieee80211_set_key_tx_seq); | |
900 | ||
901 | void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf, | |
902 | int tid, struct ieee80211_key_seq *seq) | |
903 | { | |
904 | struct ieee80211_key *key; | |
905 | u8 *pn; | |
906 | ||
907 | key = container_of(keyconf, struct ieee80211_key, conf); | |
908 | ||
909 | switch (key->conf.cipher) { | |
910 | case WLAN_CIPHER_SUITE_TKIP: | |
911 | if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) | |
912 | return; | |
913 | key->u.tkip.rx[tid].iv32 = seq->tkip.iv32; | |
914 | key->u.tkip.rx[tid].iv16 = seq->tkip.iv16; | |
915 | break; | |
916 | case WLAN_CIPHER_SUITE_CCMP: | |
917 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) | |
918 | return; | |
919 | if (tid < 0) | |
920 | pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; | |
921 | else | |
922 | pn = key->u.ccmp.rx_pn[tid]; | |
923 | memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN); | |
924 | break; | |
925 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
926 | if (WARN_ON(tid != 0)) | |
927 | return; | |
928 | pn = key->u.aes_cmac.rx_pn; | |
929 | memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN); | |
930 | break; | |
00b9cfa3 JM |
931 | case WLAN_CIPHER_SUITE_GCMP: |
932 | case WLAN_CIPHER_SUITE_GCMP_256: | |
933 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) | |
934 | return; | |
935 | if (tid < 0) | |
936 | pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; | |
937 | else | |
938 | pn = key->u.gcmp.rx_pn[tid]; | |
939 | memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN); | |
940 | break; | |
27b3eb9c JB |
941 | default: |
942 | WARN_ON(1); | |
943 | break; | |
944 | } | |
945 | } | |
946 | EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq); | |
947 | ||
948 | void ieee80211_remove_key(struct ieee80211_key_conf *keyconf) | |
949 | { | |
950 | struct ieee80211_key *key; | |
951 | ||
952 | key = container_of(keyconf, struct ieee80211_key, conf); | |
953 | ||
954 | assert_key_lock(key->local); | |
955 | ||
956 | /* | |
957 | * if key was uploaded, we assume the driver will/has remove(d) | |
958 | * it, so adjust bookkeeping accordingly | |
959 | */ | |
960 | if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { | |
961 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; | |
962 | ||
1e359a5d | 963 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
db12847c | 964 | (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) |
27b3eb9c JB |
965 | increment_tailroom_need_count(key->sdata); |
966 | } | |
967 | ||
968 | ieee80211_key_free(key, false); | |
969 | } | |
970 | EXPORT_SYMBOL_GPL(ieee80211_remove_key); | |
971 | ||
972 | struct ieee80211_key_conf * | |
973 | ieee80211_gtk_rekey_add(struct ieee80211_vif *vif, | |
974 | struct ieee80211_key_conf *keyconf) | |
975 | { | |
976 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
977 | struct ieee80211_local *local = sdata->local; | |
978 | struct ieee80211_key *key; | |
979 | int err; | |
980 | ||
981 | if (WARN_ON(!local->wowlan)) | |
982 | return ERR_PTR(-EINVAL); | |
983 | ||
984 | if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) | |
985 | return ERR_PTR(-EINVAL); | |
986 | ||
987 | key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx, | |
988 | keyconf->keylen, keyconf->key, | |
2475b1cc | 989 | 0, NULL, NULL); |
27b3eb9c | 990 | if (IS_ERR(key)) |
c5dc164d | 991 | return ERR_CAST(key); |
27b3eb9c JB |
992 | |
993 | if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED) | |
994 | key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT; | |
995 | ||
996 | err = ieee80211_key_link(key, sdata, NULL); | |
997 | if (err) | |
998 | return ERR_PTR(err); | |
999 | ||
1000 | return &key->conf; | |
1001 | } | |
1002 | EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add); |