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Commit | Line | Data |
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1f5a7e47 JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
3b96766f | 5 | * Copyright 2007-2008 Johannes Berg <johannes@sipsolutions.net> |
d98ad83e | 6 | * Copyright 2013-2014 Intel Mobile Communications GmbH |
fdf7cb41 | 7 | * Copyright 2015-2017 Intel Deutschland GmbH |
1f5a7e47 JB |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
11a843b7 JB |
14 | #include <linux/if_ether.h> |
15 | #include <linux/etherdevice.h> | |
16 | #include <linux/list.h> | |
d4e46a3d | 17 | #include <linux/rcupdate.h> |
db4d1169 | 18 | #include <linux/rtnetlink.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
bc3b2d7f | 20 | #include <linux/export.h> |
1f5a7e47 | 21 | #include <net/mac80211.h> |
2bdd713b | 22 | #include <crypto/algapi.h> |
d26ad377 | 23 | #include <asm/unaligned.h> |
1f5a7e47 | 24 | #include "ieee80211_i.h" |
24487981 | 25 | #include "driver-ops.h" |
1f5a7e47 JB |
26 | #include "debugfs_key.h" |
27 | #include "aes_ccm.h" | |
3cfcf6ac | 28 | #include "aes_cmac.h" |
8ade538b | 29 | #include "aes_gmac.h" |
00b9cfa3 | 30 | #include "aes_gcm.h" |
1f5a7e47 | 31 | |
11a843b7 | 32 | |
dbbea671 JB |
33 | /** |
34 | * DOC: Key handling basics | |
11a843b7 JB |
35 | * |
36 | * Key handling in mac80211 is done based on per-interface (sub_if_data) | |
37 | * keys and per-station keys. Since each station belongs to an interface, | |
38 | * each station key also belongs to that interface. | |
39 | * | |
b5c34f66 JB |
40 | * Hardware acceleration is done on a best-effort basis for algorithms |
41 | * that are implemented in software, for each key the hardware is asked | |
42 | * to enable that key for offloading but if it cannot do that the key is | |
43 | * simply kept for software encryption (unless it is for an algorithm | |
44 | * that isn't implemented in software). | |
45 | * There is currently no way of knowing whether a key is handled in SW | |
46 | * or HW except by looking into debugfs. | |
11a843b7 | 47 | * |
b5c34f66 JB |
48 | * All key management is internally protected by a mutex. Within all |
49 | * other parts of mac80211, key references are, just as STA structure | |
50 | * references, protected by RCU. Note, however, that some things are | |
51 | * unprotected, namely the key->sta dereferences within the hardware | |
52 | * acceleration functions. This means that sta_info_destroy() must | |
53 | * remove the key which waits for an RCU grace period. | |
11a843b7 JB |
54 | */ |
55 | ||
56 | static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; | |
11a843b7 | 57 | |
ad0e2b5a | 58 | static void assert_key_lock(struct ieee80211_local *local) |
3b96766f | 59 | { |
46a5ebaf | 60 | lockdep_assert_held(&local->key_mtx); |
3b96766f JB |
61 | } |
62 | ||
f9dca80b MK |
63 | static void |
64 | update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta) | |
65 | { | |
66 | struct ieee80211_sub_if_data *vlan; | |
67 | ||
68 | if (sdata->vif.type != NL80211_IFTYPE_AP) | |
69 | return; | |
70 | ||
51f458d9 JB |
71 | /* crypto_tx_tailroom_needed_cnt is protected by this */ |
72 | assert_key_lock(sdata->local); | |
f9dca80b | 73 | |
51f458d9 JB |
74 | rcu_read_lock(); |
75 | ||
76 | list_for_each_entry_rcu(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
f9dca80b MK |
77 | vlan->crypto_tx_tailroom_needed_cnt += delta; |
78 | ||
51f458d9 | 79 | rcu_read_unlock(); |
f9dca80b MK |
80 | } |
81 | ||
3bff1865 YAP |
82 | static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata) |
83 | { | |
84 | /* | |
85 | * When this count is zero, SKB resizing for allocating tailroom | |
86 | * for IV or MMIC is skipped. But, this check has created two race | |
87 | * cases in xmit path while transiting from zero count to one: | |
88 | * | |
89 | * 1. SKB resize was skipped because no key was added but just before | |
90 | * the xmit key is added and SW encryption kicks off. | |
91 | * | |
92 | * 2. SKB resize was skipped because all the keys were hw planted but | |
93 | * just before xmit one of the key is deleted and SW encryption kicks | |
94 | * off. | |
95 | * | |
96 | * In both the above case SW encryption will find not enough space for | |
97 | * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c) | |
98 | * | |
99 | * Solution has been explained at | |
100 | * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net | |
101 | */ | |
102 | ||
51f458d9 JB |
103 | assert_key_lock(sdata->local); |
104 | ||
f9dca80b MK |
105 | update_vlan_tailroom_need_count(sdata, 1); |
106 | ||
3bff1865 YAP |
107 | if (!sdata->crypto_tx_tailroom_needed_cnt++) { |
108 | /* | |
109 | * Flush all XMIT packets currently using HW encryption or no | |
110 | * encryption at all if the count transition is from 0 -> 1. | |
111 | */ | |
112 | synchronize_net(); | |
113 | } | |
114 | } | |
115 | ||
f9dca80b MK |
116 | static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata, |
117 | int delta) | |
118 | { | |
51f458d9 JB |
119 | assert_key_lock(sdata->local); |
120 | ||
f9dca80b MK |
121 | WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta); |
122 | ||
123 | update_vlan_tailroom_need_count(sdata, -delta); | |
124 | sdata->crypto_tx_tailroom_needed_cnt -= delta; | |
125 | } | |
126 | ||
3ffc2a90 | 127 | static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key) |
11a843b7 | 128 | { |
dc822b5d | 129 | struct ieee80211_sub_if_data *sdata; |
89c91cae | 130 | struct sta_info *sta; |
fa7e1fbc | 131 | int ret = -EOPNOTSUPP; |
11a843b7 | 132 | |
3b96766f JB |
133 | might_sleep(); |
134 | ||
4619194a JB |
135 | if (key->flags & KEY_FLAG_TAINTED) { |
136 | /* If we get here, it's during resume and the key is | |
137 | * tainted so shouldn't be used/programmed any more. | |
138 | * However, its flags may still indicate that it was | |
139 | * programmed into the device (since we're in resume) | |
140 | * so clear that flag now to avoid trying to remove | |
141 | * it again later. | |
142 | */ | |
143 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; | |
27b3eb9c | 144 | return -EINVAL; |
4619194a | 145 | } |
27b3eb9c | 146 | |
e31b8213 | 147 | if (!key->local->ops->set_key) |
3ffc2a90 | 148 | goto out_unsupported; |
11a843b7 | 149 | |
ad0e2b5a JB |
150 | assert_key_lock(key->local); |
151 | ||
89c91cae | 152 | sta = key->sta; |
dc822b5d | 153 | |
e31b8213 JB |
154 | /* |
155 | * If this is a per-STA GTK, check if it | |
156 | * is supported; if not, return. | |
157 | */ | |
158 | if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) && | |
30686bf7 | 159 | !ieee80211_hw_check(&key->local->hw, SUPPORTS_PER_STA_GTK)) |
e31b8213 JB |
160 | goto out_unsupported; |
161 | ||
89c91cae JB |
162 | if (sta && !sta->uploaded) |
163 | goto out_unsupported; | |
164 | ||
dc822b5d | 165 | sdata = key->sdata; |
18890d4b HS |
166 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { |
167 | /* | |
168 | * The driver doesn't know anything about VLAN interfaces. | |
169 | * Hence, don't send GTKs for VLAN interfaces to the driver. | |
170 | */ | |
171 | if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) | |
172 | goto out_unsupported; | |
18890d4b | 173 | } |
11a843b7 | 174 | |
89c91cae JB |
175 | ret = drv_set_key(key->local, SET_KEY, sdata, |
176 | sta ? &sta->sta : NULL, &key->conf); | |
11a843b7 | 177 | |
e31b8213 | 178 | if (!ret) { |
11a843b7 | 179 | key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; |
3bff1865 | 180 | |
9de18d81 DS |
181 | if (!((key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | |
182 | IEEE80211_KEY_FLAG_PUT_MIC_SPACE)) || | |
db12847c | 183 | (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) |
f9dca80b | 184 | decrease_tailroom_need_count(sdata, 1); |
3bff1865 | 185 | |
077a9154 AN |
186 | WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && |
187 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)); | |
188 | ||
9de18d81 DS |
189 | WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) && |
190 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)); | |
191 | ||
e31b8213 JB |
192 | return 0; |
193 | } | |
11a843b7 | 194 | |
fa7e1fbc | 195 | if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1) |
bdcbd8e0 | 196 | sdata_err(sdata, |
0fb9a9ec | 197 | "failed to set key (%d, %pM) to hardware (%d)\n", |
89c91cae JB |
198 | key->conf.keyidx, |
199 | sta ? sta->sta.addr : bcast_addr, ret); | |
3ffc2a90 | 200 | |
e31b8213 JB |
201 | out_unsupported: |
202 | switch (key->conf.cipher) { | |
203 | case WLAN_CIPHER_SUITE_WEP40: | |
204 | case WLAN_CIPHER_SUITE_WEP104: | |
205 | case WLAN_CIPHER_SUITE_TKIP: | |
206 | case WLAN_CIPHER_SUITE_CCMP: | |
2b2ba0db | 207 | case WLAN_CIPHER_SUITE_CCMP_256: |
e31b8213 | 208 | case WLAN_CIPHER_SUITE_AES_CMAC: |
56c52da2 | 209 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
8ade538b JM |
210 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
211 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
00b9cfa3 JM |
212 | case WLAN_CIPHER_SUITE_GCMP: |
213 | case WLAN_CIPHER_SUITE_GCMP_256: | |
fa7e1fbc JB |
214 | /* all of these we can do in software - if driver can */ |
215 | if (ret == 1) | |
216 | return 0; | |
30686bf7 | 217 | if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL)) |
fa7e1fbc | 218 | return -EINVAL; |
e31b8213 JB |
219 | return 0; |
220 | default: | |
221 | return -EINVAL; | |
3ffc2a90 | 222 | } |
11a843b7 JB |
223 | } |
224 | ||
225 | static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key) | |
226 | { | |
dc822b5d | 227 | struct ieee80211_sub_if_data *sdata; |
89c91cae | 228 | struct sta_info *sta; |
11a843b7 JB |
229 | int ret; |
230 | ||
3b96766f JB |
231 | might_sleep(); |
232 | ||
db4d1169 | 233 | if (!key || !key->local->ops->set_key) |
11a843b7 JB |
234 | return; |
235 | ||
ad0e2b5a JB |
236 | assert_key_lock(key->local); |
237 | ||
238 | if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) | |
11a843b7 JB |
239 | return; |
240 | ||
89c91cae | 241 | sta = key->sta; |
dc822b5d JB |
242 | sdata = key->sdata; |
243 | ||
9de18d81 DS |
244 | if (!((key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | |
245 | IEEE80211_KEY_FLAG_PUT_MIC_SPACE)) || | |
db12847c | 246 | (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) |
3bff1865 YAP |
247 | increment_tailroom_need_count(sdata); |
248 | ||
12375ef9 | 249 | ret = drv_set_key(key->local, DISABLE_KEY, sdata, |
89c91cae | 250 | sta ? &sta->sta : NULL, &key->conf); |
11a843b7 JB |
251 | |
252 | if (ret) | |
bdcbd8e0 | 253 | sdata_err(sdata, |
0fb9a9ec | 254 | "failed to remove key (%d, %pM) from hardware (%d)\n", |
89c91cae JB |
255 | key->conf.keyidx, |
256 | sta ? sta->sta.addr : bcast_addr, ret); | |
11a843b7 | 257 | |
3b96766f | 258 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; |
3b96766f JB |
259 | } |
260 | ||
261 | static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, | |
f7e0104c | 262 | int idx, bool uni, bool multi) |
3b96766f JB |
263 | { |
264 | struct ieee80211_key *key = NULL; | |
265 | ||
ad0e2b5a JB |
266 | assert_key_lock(sdata->local); |
267 | ||
3b96766f | 268 | if (idx >= 0 && idx < NUM_DEFAULT_KEYS) |
40b275b6 | 269 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
3b96766f | 270 | |
de5fad81 | 271 | if (uni) { |
f7e0104c | 272 | rcu_assign_pointer(sdata->default_unicast_key, key); |
17c18bf8 | 273 | ieee80211_check_fast_xmit_iface(sdata); |
ec4efc4a JB |
274 | if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) |
275 | drv_set_default_unicast_key(sdata->local, sdata, idx); | |
de5fad81 YD |
276 | } |
277 | ||
f7e0104c JB |
278 | if (multi) |
279 | rcu_assign_pointer(sdata->default_multicast_key, key); | |
3b96766f | 280 | |
f7e0104c | 281 | ieee80211_debugfs_key_update_default(sdata); |
3b96766f JB |
282 | } |
283 | ||
f7e0104c JB |
284 | void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx, |
285 | bool uni, bool multi) | |
3b96766f | 286 | { |
ad0e2b5a | 287 | mutex_lock(&sdata->local->key_mtx); |
f7e0104c | 288 | __ieee80211_set_default_key(sdata, idx, uni, multi); |
ad0e2b5a | 289 | mutex_unlock(&sdata->local->key_mtx); |
3b96766f JB |
290 | } |
291 | ||
3cfcf6ac JM |
292 | static void |
293 | __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx) | |
294 | { | |
295 | struct ieee80211_key *key = NULL; | |
296 | ||
ad0e2b5a JB |
297 | assert_key_lock(sdata->local); |
298 | ||
3cfcf6ac JM |
299 | if (idx >= NUM_DEFAULT_KEYS && |
300 | idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
40b275b6 | 301 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
3cfcf6ac JM |
302 | |
303 | rcu_assign_pointer(sdata->default_mgmt_key, key); | |
304 | ||
f7e0104c | 305 | ieee80211_debugfs_key_update_default(sdata); |
3cfcf6ac JM |
306 | } |
307 | ||
308 | void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, | |
309 | int idx) | |
310 | { | |
ad0e2b5a | 311 | mutex_lock(&sdata->local->key_mtx); |
3cfcf6ac | 312 | __ieee80211_set_default_mgmt_key(sdata, idx); |
ad0e2b5a | 313 | mutex_unlock(&sdata->local->key_mtx); |
3cfcf6ac JM |
314 | } |
315 | ||
3b96766f | 316 | |
3b8d9c29 JB |
317 | static void ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, |
318 | struct sta_info *sta, | |
319 | bool pairwise, | |
320 | struct ieee80211_key *old, | |
321 | struct ieee80211_key *new) | |
3b96766f | 322 | { |
f7e0104c JB |
323 | int idx; |
324 | bool defunikey, defmultikey, defmgmtkey; | |
3b96766f | 325 | |
5282c3ba JB |
326 | /* caller must provide at least one old/new */ |
327 | if (WARN_ON(!new && !old)) | |
328 | return; | |
329 | ||
3b96766f | 330 | if (new) |
ef044763 | 331 | list_add_tail_rcu(&new->list, &sdata->key_list); |
3b96766f | 332 | |
2475b1cc | 333 | WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx); |
3b96766f | 334 | |
2475b1cc MS |
335 | if (old) |
336 | idx = old->conf.keyidx; | |
337 | else | |
338 | idx = new->conf.keyidx; | |
3b96766f | 339 | |
2475b1cc MS |
340 | if (sta) { |
341 | if (pairwise) { | |
342 | rcu_assign_pointer(sta->ptk[idx], new); | |
343 | sta->ptk_idx = idx; | |
17c18bf8 | 344 | ieee80211_check_fast_xmit(sta); |
2475b1cc MS |
345 | } else { |
346 | rcu_assign_pointer(sta->gtk[idx], new); | |
2475b1cc | 347 | } |
49ddf8e6 | 348 | ieee80211_check_fast_rx(sta); |
2475b1cc | 349 | } else { |
40b275b6 JB |
350 | defunikey = old && |
351 | old == key_mtx_dereference(sdata->local, | |
352 | sdata->default_unicast_key); | |
353 | defmultikey = old && | |
354 | old == key_mtx_dereference(sdata->local, | |
355 | sdata->default_multicast_key); | |
356 | defmgmtkey = old && | |
357 | old == key_mtx_dereference(sdata->local, | |
358 | sdata->default_mgmt_key); | |
3b96766f | 359 | |
f7e0104c JB |
360 | if (defunikey && !new) |
361 | __ieee80211_set_default_key(sdata, -1, true, false); | |
362 | if (defmultikey && !new) | |
363 | __ieee80211_set_default_key(sdata, -1, false, true); | |
3cfcf6ac JM |
364 | if (defmgmtkey && !new) |
365 | __ieee80211_set_default_mgmt_key(sdata, -1); | |
3b96766f JB |
366 | |
367 | rcu_assign_pointer(sdata->keys[idx], new); | |
f7e0104c JB |
368 | if (defunikey && new) |
369 | __ieee80211_set_default_key(sdata, new->conf.keyidx, | |
370 | true, false); | |
371 | if (defmultikey && new) | |
372 | __ieee80211_set_default_key(sdata, new->conf.keyidx, | |
373 | false, true); | |
3cfcf6ac JM |
374 | if (defmgmtkey && new) |
375 | __ieee80211_set_default_mgmt_key(sdata, | |
376 | new->conf.keyidx); | |
3b96766f JB |
377 | } |
378 | ||
b5c34f66 | 379 | if (old) |
ef044763 | 380 | list_del_rcu(&old->list); |
11a843b7 JB |
381 | } |
382 | ||
2475b1cc MS |
383 | struct ieee80211_key * |
384 | ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, | |
385 | const u8 *key_data, | |
386 | size_t seq_len, const u8 *seq, | |
387 | const struct ieee80211_cipher_scheme *cs) | |
1f5a7e47 JB |
388 | { |
389 | struct ieee80211_key *key; | |
1ac62ba7 | 390 | int i, j, err; |
1f5a7e47 | 391 | |
8c5bb1fa JB |
392 | if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)) |
393 | return ERR_PTR(-EINVAL); | |
11a843b7 JB |
394 | |
395 | key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); | |
1f5a7e47 | 396 | if (!key) |
1ac62ba7 | 397 | return ERR_PTR(-ENOMEM); |
11a843b7 JB |
398 | |
399 | /* | |
400 | * Default to software encryption; we'll later upload the | |
401 | * key to the hardware if possible. | |
402 | */ | |
11a843b7 JB |
403 | key->conf.flags = 0; |
404 | key->flags = 0; | |
405 | ||
97359d12 | 406 | key->conf.cipher = cipher; |
11a843b7 JB |
407 | key->conf.keyidx = idx; |
408 | key->conf.keylen = key_len; | |
97359d12 JB |
409 | switch (cipher) { |
410 | case WLAN_CIPHER_SUITE_WEP40: | |
411 | case WLAN_CIPHER_SUITE_WEP104: | |
4325f6ca JB |
412 | key->conf.iv_len = IEEE80211_WEP_IV_LEN; |
413 | key->conf.icv_len = IEEE80211_WEP_ICV_LEN; | |
76708dee | 414 | break; |
97359d12 | 415 | case WLAN_CIPHER_SUITE_TKIP: |
4325f6ca JB |
416 | key->conf.iv_len = IEEE80211_TKIP_IV_LEN; |
417 | key->conf.icv_len = IEEE80211_TKIP_ICV_LEN; | |
9f26a952 | 418 | if (seq) { |
5a306f58 | 419 | for (i = 0; i < IEEE80211_NUM_TIDS; i++) { |
faa8fdc8 JM |
420 | key->u.tkip.rx[i].iv32 = |
421 | get_unaligned_le32(&seq[2]); | |
422 | key->u.tkip.rx[i].iv16 = | |
423 | get_unaligned_le16(seq); | |
424 | } | |
425 | } | |
523b02ea | 426 | spin_lock_init(&key->u.tkip.txlock); |
76708dee | 427 | break; |
97359d12 | 428 | case WLAN_CIPHER_SUITE_CCMP: |
4325f6ca JB |
429 | key->conf.iv_len = IEEE80211_CCMP_HDR_LEN; |
430 | key->conf.icv_len = IEEE80211_CCMP_MIC_LEN; | |
9f26a952 | 431 | if (seq) { |
5a306f58 | 432 | for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) |
4325f6ca | 433 | for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++) |
faa8fdc8 | 434 | key->u.ccmp.rx_pn[i][j] = |
4325f6ca | 435 | seq[IEEE80211_CCMP_PN_LEN - j - 1]; |
faa8fdc8 | 436 | } |
11a843b7 JB |
437 | /* |
438 | * Initialize AES key state here as an optimization so that | |
439 | * it does not need to be initialized for every packet. | |
440 | */ | |
2b2ba0db JM |
441 | key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt( |
442 | key_data, key_len, IEEE80211_CCMP_MIC_LEN); | |
443 | if (IS_ERR(key->u.ccmp.tfm)) { | |
444 | err = PTR_ERR(key->u.ccmp.tfm); | |
445 | kfree(key); | |
446 | return ERR_PTR(err); | |
447 | } | |
448 | break; | |
449 | case WLAN_CIPHER_SUITE_CCMP_256: | |
450 | key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN; | |
451 | key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN; | |
452 | for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++) | |
453 | for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++) | |
454 | key->u.ccmp.rx_pn[i][j] = | |
455 | seq[IEEE80211_CCMP_256_PN_LEN - j - 1]; | |
456 | /* Initialize AES key state here as an optimization so that | |
457 | * it does not need to be initialized for every packet. | |
458 | */ | |
459 | key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt( | |
460 | key_data, key_len, IEEE80211_CCMP_256_MIC_LEN); | |
1ac62ba7 BH |
461 | if (IS_ERR(key->u.ccmp.tfm)) { |
462 | err = PTR_ERR(key->u.ccmp.tfm); | |
3b96766f | 463 | kfree(key); |
1f951a7f | 464 | return ERR_PTR(err); |
11a843b7 | 465 | } |
60ae0f20 JB |
466 | break; |
467 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
56c52da2 | 468 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
60ae0f20 | 469 | key->conf.iv_len = 0; |
56c52da2 JM |
470 | if (cipher == WLAN_CIPHER_SUITE_AES_CMAC) |
471 | key->conf.icv_len = sizeof(struct ieee80211_mmie); | |
472 | else | |
473 | key->conf.icv_len = sizeof(struct ieee80211_mmie_16); | |
60ae0f20 | 474 | if (seq) |
4325f6ca | 475 | for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++) |
0f927323 | 476 | key->u.aes_cmac.rx_pn[j] = |
4325f6ca | 477 | seq[IEEE80211_CMAC_PN_LEN - j - 1]; |
3cfcf6ac JM |
478 | /* |
479 | * Initialize AES key state here as an optimization so that | |
480 | * it does not need to be initialized for every packet. | |
481 | */ | |
482 | key->u.aes_cmac.tfm = | |
56c52da2 | 483 | ieee80211_aes_cmac_key_setup(key_data, key_len); |
1ac62ba7 BH |
484 | if (IS_ERR(key->u.aes_cmac.tfm)) { |
485 | err = PTR_ERR(key->u.aes_cmac.tfm); | |
3cfcf6ac | 486 | kfree(key); |
1f951a7f | 487 | return ERR_PTR(err); |
3cfcf6ac | 488 | } |
60ae0f20 | 489 | break; |
8ade538b JM |
490 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
491 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
492 | key->conf.iv_len = 0; | |
493 | key->conf.icv_len = sizeof(struct ieee80211_mmie_16); | |
494 | if (seq) | |
495 | for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++) | |
496 | key->u.aes_gmac.rx_pn[j] = | |
497 | seq[IEEE80211_GMAC_PN_LEN - j - 1]; | |
498 | /* Initialize AES key state here as an optimization so that | |
499 | * it does not need to be initialized for every packet. | |
500 | */ | |
501 | key->u.aes_gmac.tfm = | |
502 | ieee80211_aes_gmac_key_setup(key_data, key_len); | |
503 | if (IS_ERR(key->u.aes_gmac.tfm)) { | |
504 | err = PTR_ERR(key->u.aes_gmac.tfm); | |
505 | kfree(key); | |
506 | return ERR_PTR(err); | |
507 | } | |
508 | break; | |
00b9cfa3 JM |
509 | case WLAN_CIPHER_SUITE_GCMP: |
510 | case WLAN_CIPHER_SUITE_GCMP_256: | |
511 | key->conf.iv_len = IEEE80211_GCMP_HDR_LEN; | |
512 | key->conf.icv_len = IEEE80211_GCMP_MIC_LEN; | |
513 | for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++) | |
514 | for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++) | |
515 | key->u.gcmp.rx_pn[i][j] = | |
516 | seq[IEEE80211_GCMP_PN_LEN - j - 1]; | |
517 | /* Initialize AES key state here as an optimization so that | |
518 | * it does not need to be initialized for every packet. | |
519 | */ | |
520 | key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data, | |
521 | key_len); | |
522 | if (IS_ERR(key->u.gcmp.tfm)) { | |
523 | err = PTR_ERR(key->u.gcmp.tfm); | |
524 | kfree(key); | |
525 | return ERR_PTR(err); | |
526 | } | |
527 | break; | |
2475b1cc MS |
528 | default: |
529 | if (cs) { | |
e3a55b53 JB |
530 | if (seq_len && seq_len != cs->pn_len) { |
531 | kfree(key); | |
532 | return ERR_PTR(-EINVAL); | |
533 | } | |
2475b1cc MS |
534 | |
535 | key->conf.iv_len = cs->hdr_len; | |
536 | key->conf.icv_len = cs->mic_len; | |
537 | for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) | |
e3a55b53 | 538 | for (j = 0; j < seq_len; j++) |
2475b1cc | 539 | key->u.gen.rx_pn[i][j] = |
e3a55b53 | 540 | seq[seq_len - j - 1]; |
c7ef38e0 | 541 | key->flags |= KEY_FLAG_CIPHER_SCHEME; |
2475b1cc | 542 | } |
3cfcf6ac | 543 | } |
60ae0f20 JB |
544 | memcpy(key->conf.key, key_data, key_len); |
545 | INIT_LIST_HEAD(&key->list); | |
3cfcf6ac | 546 | |
db4d1169 JB |
547 | return key; |
548 | } | |
11a843b7 | 549 | |
79cf2dfa JB |
550 | static void ieee80211_key_free_common(struct ieee80211_key *key) |
551 | { | |
00b9cfa3 JM |
552 | switch (key->conf.cipher) { |
553 | case WLAN_CIPHER_SUITE_CCMP: | |
2b2ba0db | 554 | case WLAN_CIPHER_SUITE_CCMP_256: |
79cf2dfa | 555 | ieee80211_aes_key_free(key->u.ccmp.tfm); |
00b9cfa3 JM |
556 | break; |
557 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
56c52da2 | 558 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
79cf2dfa | 559 | ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); |
00b9cfa3 | 560 | break; |
8ade538b JM |
561 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
562 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
563 | ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm); | |
564 | break; | |
00b9cfa3 JM |
565 | case WLAN_CIPHER_SUITE_GCMP: |
566 | case WLAN_CIPHER_SUITE_GCMP_256: | |
567 | ieee80211_aes_gcm_key_free(key->u.gcmp.tfm); | |
568 | break; | |
569 | } | |
29c3f9c3 | 570 | kzfree(key); |
79cf2dfa JB |
571 | } |
572 | ||
6d10e46b JB |
573 | static void __ieee80211_key_destroy(struct ieee80211_key *key, |
574 | bool delay_tailroom) | |
ad0e2b5a | 575 | { |
32162a4d JM |
576 | if (key->local) |
577 | ieee80211_key_disable_hw_accel(key); | |
ad0e2b5a | 578 | |
3bff1865 | 579 | if (key->local) { |
8d1f7ecd JB |
580 | struct ieee80211_sub_if_data *sdata = key->sdata; |
581 | ||
32162a4d | 582 | ieee80211_debugfs_key_remove(key); |
8d1f7ecd JB |
583 | |
584 | if (delay_tailroom) { | |
585 | /* see ieee80211_delayed_tailroom_dec */ | |
586 | sdata->crypto_tx_tailroom_pending_dec++; | |
587 | schedule_delayed_work(&sdata->dec_tailroom_needed_wk, | |
588 | HZ/2); | |
589 | } else { | |
f9dca80b | 590 | decrease_tailroom_need_count(sdata, 1); |
8d1f7ecd | 591 | } |
3bff1865 | 592 | } |
ad0e2b5a | 593 | |
79cf2dfa JB |
594 | ieee80211_key_free_common(key); |
595 | } | |
596 | ||
6d10e46b JB |
597 | static void ieee80211_key_destroy(struct ieee80211_key *key, |
598 | bool delay_tailroom) | |
599 | { | |
600 | if (!key) | |
601 | return; | |
602 | ||
603 | /* | |
ef044763 EP |
604 | * Synchronize so the TX path and rcu key iterators |
605 | * can no longer be using this key before we free/remove it. | |
6d10e46b JB |
606 | */ |
607 | synchronize_net(); | |
608 | ||
609 | __ieee80211_key_destroy(key, delay_tailroom); | |
610 | } | |
611 | ||
79cf2dfa JB |
612 | void ieee80211_key_free_unused(struct ieee80211_key *key) |
613 | { | |
614 | WARN_ON(key->sdata || key->local); | |
615 | ieee80211_key_free_common(key); | |
ad0e2b5a JB |
616 | } |
617 | ||
cfbb0d90 JB |
618 | static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata, |
619 | struct ieee80211_key *old, | |
620 | struct ieee80211_key *new) | |
621 | { | |
622 | u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP]; | |
623 | u8 *tk_old, *tk_new; | |
624 | ||
625 | if (!old || new->conf.keylen != old->conf.keylen) | |
626 | return false; | |
627 | ||
628 | tk_old = old->conf.key; | |
629 | tk_new = new->conf.key; | |
630 | ||
631 | /* | |
632 | * In station mode, don't compare the TX MIC key, as it's never used | |
633 | * and offloaded rekeying may not care to send it to the host. This | |
634 | * is the case in iwlwifi, for example. | |
635 | */ | |
636 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
637 | new->conf.cipher == WLAN_CIPHER_SUITE_TKIP && | |
638 | new->conf.keylen == WLAN_KEY_LEN_TKIP && | |
639 | !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) { | |
640 | memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP); | |
641 | memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP); | |
642 | memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8); | |
643 | memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8); | |
644 | tk_old = tkip_old; | |
645 | tk_new = tkip_new; | |
646 | } | |
647 | ||
648 | return !crypto_memneq(tk_old, tk_new, new->conf.keylen); | |
649 | } | |
650 | ||
3ffc2a90 JB |
651 | int ieee80211_key_link(struct ieee80211_key *key, |
652 | struct ieee80211_sub_if_data *sdata, | |
653 | struct sta_info *sta) | |
db4d1169 | 654 | { |
27b3eb9c | 655 | struct ieee80211_local *local = sdata->local; |
db4d1169 | 656 | struct ieee80211_key *old_key; |
3ffc2a90 | 657 | int idx, ret; |
67aa030c | 658 | bool pairwise; |
db4d1169 | 659 | |
67aa030c | 660 | pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE; |
db4d1169 | 661 | idx = key->conf.keyidx; |
db4d1169 | 662 | |
ad0e2b5a | 663 | mutex_lock(&sdata->local->key_mtx); |
3b96766f | 664 | |
e31b8213 | 665 | if (sta && pairwise) |
2475b1cc | 666 | old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]); |
e31b8213 | 667 | else if (sta) |
40b275b6 | 668 | old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]); |
d4e46a3d | 669 | else |
40b275b6 | 670 | old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
db4d1169 | 671 | |
fdf7cb41 JB |
672 | /* |
673 | * Silently accept key re-installation without really installing the | |
674 | * new version of the key to avoid nonce reuse or replay issues. | |
675 | */ | |
cfbb0d90 | 676 | if (ieee80211_key_identical(sdata, old_key, key)) { |
fdf7cb41 JB |
677 | ieee80211_key_free_unused(key); |
678 | ret = 0; | |
679 | goto out; | |
680 | } | |
681 | ||
682 | key->local = sdata->local; | |
683 | key->sdata = sdata; | |
684 | key->sta = sta; | |
685 | ||
3bff1865 YAP |
686 | increment_tailroom_need_count(sdata); |
687 | ||
3b8d9c29 JB |
688 | ieee80211_key_replace(sdata, sta, pairwise, old_key, key); |
689 | ieee80211_key_destroy(old_key, true); | |
d4e46a3d | 690 | |
ad0e2b5a | 691 | ieee80211_debugfs_key_add(key); |
db4d1169 | 692 | |
27b3eb9c JB |
693 | if (!local->wowlan) { |
694 | ret = ieee80211_key_enable_hw_accel(key); | |
695 | if (ret) | |
696 | ieee80211_key_free(key, true); | |
697 | } else { | |
698 | ret = 0; | |
699 | } | |
79cf2dfa | 700 | |
fdf7cb41 | 701 | out: |
ad0e2b5a | 702 | mutex_unlock(&sdata->local->key_mtx); |
3ffc2a90 JB |
703 | |
704 | return ret; | |
1f5a7e47 JB |
705 | } |
706 | ||
3b8d9c29 | 707 | void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom) |
1f5a7e47 | 708 | { |
5c0c3641 JB |
709 | if (!key) |
710 | return; | |
711 | ||
3b96766f JB |
712 | /* |
713 | * Replace key with nothingness if it was ever used. | |
714 | */ | |
3a245766 | 715 | if (key->sdata) |
3b8d9c29 | 716 | ieee80211_key_replace(key->sdata, key->sta, |
e31b8213 JB |
717 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, |
718 | key, NULL); | |
3b8d9c29 | 719 | ieee80211_key_destroy(key, delay_tailroom); |
3b96766f | 720 | } |
d4e46a3d | 721 | |
ad0e2b5a | 722 | void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata) |
3a245766 JB |
723 | { |
724 | struct ieee80211_key *key; | |
f9dca80b | 725 | struct ieee80211_sub_if_data *vlan; |
11a843b7 | 726 | |
3a245766 | 727 | ASSERT_RTNL(); |
11a843b7 | 728 | |
9607e6b6 | 729 | if (WARN_ON(!ieee80211_sdata_running(sdata))) |
3a245766 | 730 | return; |
11a843b7 | 731 | |
ad0e2b5a | 732 | mutex_lock(&sdata->local->key_mtx); |
11a843b7 | 733 | |
f9dca80b MK |
734 | WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || |
735 | sdata->crypto_tx_tailroom_pending_dec); | |
736 | ||
737 | if (sdata->vif.type == NL80211_IFTYPE_AP) { | |
738 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
739 | WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt || | |
740 | vlan->crypto_tx_tailroom_pending_dec); | |
741 | } | |
3bff1865 YAP |
742 | |
743 | list_for_each_entry(key, &sdata->key_list, list) { | |
744 | increment_tailroom_need_count(sdata); | |
ad0e2b5a | 745 | ieee80211_key_enable_hw_accel(key); |
3bff1865 | 746 | } |
3b96766f | 747 | |
ad0e2b5a | 748 | mutex_unlock(&sdata->local->key_mtx); |
11a843b7 JB |
749 | } |
750 | ||
f9dca80b MK |
751 | void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata) |
752 | { | |
753 | struct ieee80211_sub_if_data *vlan; | |
754 | ||
755 | mutex_lock(&sdata->local->key_mtx); | |
756 | ||
757 | sdata->crypto_tx_tailroom_needed_cnt = 0; | |
758 | ||
759 | if (sdata->vif.type == NL80211_IFTYPE_AP) { | |
760 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
761 | vlan->crypto_tx_tailroom_needed_cnt = 0; | |
762 | } | |
763 | ||
764 | mutex_unlock(&sdata->local->key_mtx); | |
765 | } | |
766 | ||
830af02f JB |
767 | void ieee80211_iter_keys(struct ieee80211_hw *hw, |
768 | struct ieee80211_vif *vif, | |
769 | void (*iter)(struct ieee80211_hw *hw, | |
770 | struct ieee80211_vif *vif, | |
771 | struct ieee80211_sta *sta, | |
772 | struct ieee80211_key_conf *key, | |
773 | void *data), | |
774 | void *iter_data) | |
775 | { | |
776 | struct ieee80211_local *local = hw_to_local(hw); | |
27b3eb9c | 777 | struct ieee80211_key *key, *tmp; |
830af02f JB |
778 | struct ieee80211_sub_if_data *sdata; |
779 | ||
780 | ASSERT_RTNL(); | |
781 | ||
782 | mutex_lock(&local->key_mtx); | |
783 | if (vif) { | |
784 | sdata = vif_to_sdata(vif); | |
27b3eb9c | 785 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) |
830af02f JB |
786 | iter(hw, &sdata->vif, |
787 | key->sta ? &key->sta->sta : NULL, | |
788 | &key->conf, iter_data); | |
789 | } else { | |
790 | list_for_each_entry(sdata, &local->interfaces, list) | |
27b3eb9c JB |
791 | list_for_each_entry_safe(key, tmp, |
792 | &sdata->key_list, list) | |
830af02f JB |
793 | iter(hw, &sdata->vif, |
794 | key->sta ? &key->sta->sta : NULL, | |
795 | &key->conf, iter_data); | |
796 | } | |
797 | mutex_unlock(&local->key_mtx); | |
798 | } | |
799 | EXPORT_SYMBOL(ieee80211_iter_keys); | |
800 | ||
ef044763 EP |
801 | static void |
802 | _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw, | |
803 | struct ieee80211_sub_if_data *sdata, | |
804 | void (*iter)(struct ieee80211_hw *hw, | |
805 | struct ieee80211_vif *vif, | |
806 | struct ieee80211_sta *sta, | |
807 | struct ieee80211_key_conf *key, | |
808 | void *data), | |
809 | void *iter_data) | |
810 | { | |
811 | struct ieee80211_key *key; | |
812 | ||
813 | list_for_each_entry_rcu(key, &sdata->key_list, list) { | |
814 | /* skip keys of station in removal process */ | |
815 | if (key->sta && key->sta->removed) | |
816 | continue; | |
817 | if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) | |
818 | continue; | |
819 | ||
820 | iter(hw, &sdata->vif, | |
821 | key->sta ? &key->sta->sta : NULL, | |
822 | &key->conf, iter_data); | |
823 | } | |
824 | } | |
825 | ||
826 | void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw, | |
827 | struct ieee80211_vif *vif, | |
828 | void (*iter)(struct ieee80211_hw *hw, | |
829 | struct ieee80211_vif *vif, | |
830 | struct ieee80211_sta *sta, | |
831 | struct ieee80211_key_conf *key, | |
832 | void *data), | |
833 | void *iter_data) | |
834 | { | |
835 | struct ieee80211_local *local = hw_to_local(hw); | |
836 | struct ieee80211_sub_if_data *sdata; | |
837 | ||
838 | if (vif) { | |
839 | sdata = vif_to_sdata(vif); | |
840 | _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data); | |
841 | } else { | |
842 | list_for_each_entry_rcu(sdata, &local->interfaces, list) | |
843 | _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data); | |
844 | } | |
845 | } | |
846 | EXPORT_SYMBOL(ieee80211_iter_keys_rcu); | |
847 | ||
7907c7d3 JB |
848 | static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata, |
849 | struct list_head *keys) | |
3b96766f JB |
850 | { |
851 | struct ieee80211_key *key, *tmp; | |
3b96766f | 852 | |
f9dca80b MK |
853 | decrease_tailroom_need_count(sdata, |
854 | sdata->crypto_tx_tailroom_pending_dec); | |
8d1f7ecd JB |
855 | sdata->crypto_tx_tailroom_pending_dec = 0; |
856 | ||
3cfcf6ac | 857 | ieee80211_debugfs_key_remove_mgmt_default(sdata); |
3b96766f | 858 | |
6d10e46b JB |
859 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) { |
860 | ieee80211_key_replace(key->sdata, key->sta, | |
861 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
862 | key, NULL); | |
7907c7d3 | 863 | list_add_tail(&key->list, keys); |
6d10e46b | 864 | } |
3b96766f | 865 | |
f7e0104c | 866 | ieee80211_debugfs_key_update_default(sdata); |
7907c7d3 | 867 | } |
f7e0104c | 868 | |
7907c7d3 JB |
869 | void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata, |
870 | bool force_synchronize) | |
871 | { | |
872 | struct ieee80211_local *local = sdata->local; | |
873 | struct ieee80211_sub_if_data *vlan; | |
f9dca80b | 874 | struct ieee80211_sub_if_data *master; |
7907c7d3 JB |
875 | struct ieee80211_key *key, *tmp; |
876 | LIST_HEAD(keys); | |
877 | ||
878 | cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk); | |
879 | ||
880 | mutex_lock(&local->key_mtx); | |
881 | ||
882 | ieee80211_free_keys_iface(sdata, &keys); | |
883 | ||
884 | if (sdata->vif.type == NL80211_IFTYPE_AP) { | |
885 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
886 | ieee80211_free_keys_iface(vlan, &keys); | |
6d10e46b JB |
887 | } |
888 | ||
7907c7d3 JB |
889 | if (!list_empty(&keys) || force_synchronize) |
890 | synchronize_net(); | |
891 | list_for_each_entry_safe(key, tmp, &keys, list) | |
892 | __ieee80211_key_destroy(key, false); | |
893 | ||
f9dca80b MK |
894 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { |
895 | if (sdata->bss) { | |
896 | master = container_of(sdata->bss, | |
897 | struct ieee80211_sub_if_data, | |
898 | u.ap); | |
899 | ||
900 | WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt != | |
901 | master->crypto_tx_tailroom_needed_cnt); | |
902 | } | |
903 | } else { | |
904 | WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || | |
905 | sdata->crypto_tx_tailroom_pending_dec); | |
906 | } | |
907 | ||
7907c7d3 JB |
908 | if (sdata->vif.type == NL80211_IFTYPE_AP) { |
909 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
910 | WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt || | |
911 | vlan->crypto_tx_tailroom_pending_dec); | |
912 | } | |
8d1f7ecd | 913 | |
7907c7d3 | 914 | mutex_unlock(&local->key_mtx); |
11a843b7 | 915 | } |
c68f4b89 | 916 | |
6d10e46b JB |
917 | void ieee80211_free_sta_keys(struct ieee80211_local *local, |
918 | struct sta_info *sta) | |
919 | { | |
c8782078 | 920 | struct ieee80211_key *key; |
6d10e46b JB |
921 | int i; |
922 | ||
923 | mutex_lock(&local->key_mtx); | |
28a9bc68 | 924 | for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) { |
6d10e46b JB |
925 | key = key_mtx_dereference(local, sta->gtk[i]); |
926 | if (!key) | |
927 | continue; | |
928 | ieee80211_key_replace(key->sdata, key->sta, | |
929 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
930 | key, NULL); | |
c8782078 | 931 | __ieee80211_key_destroy(key, true); |
6d10e46b JB |
932 | } |
933 | ||
2475b1cc MS |
934 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { |
935 | key = key_mtx_dereference(local, sta->ptk[i]); | |
936 | if (!key) | |
937 | continue; | |
6d10e46b JB |
938 | ieee80211_key_replace(key->sdata, key->sta, |
939 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
940 | key, NULL); | |
6d10e46b | 941 | __ieee80211_key_destroy(key, true); |
c8782078 | 942 | } |
6d10e46b JB |
943 | |
944 | mutex_unlock(&local->key_mtx); | |
945 | } | |
946 | ||
8d1f7ecd JB |
947 | void ieee80211_delayed_tailroom_dec(struct work_struct *wk) |
948 | { | |
949 | struct ieee80211_sub_if_data *sdata; | |
950 | ||
951 | sdata = container_of(wk, struct ieee80211_sub_if_data, | |
952 | dec_tailroom_needed_wk.work); | |
953 | ||
954 | /* | |
955 | * The reason for the delayed tailroom needed decrementing is to | |
956 | * make roaming faster: during roaming, all keys are first deleted | |
957 | * and then new keys are installed. The first new key causes the | |
958 | * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes | |
959 | * the cost of synchronize_net() (which can be slow). Avoid this | |
960 | * by deferring the crypto_tx_tailroom_needed_cnt decrementing on | |
961 | * key removal for a while, so if we roam the value is larger than | |
962 | * zero and no 0->1 transition happens. | |
963 | * | |
964 | * The cost is that if the AP switching was from an AP with keys | |
965 | * to one without, we still allocate tailroom while it would no | |
966 | * longer be needed. However, in the typical (fast) roaming case | |
967 | * within an ESS this usually won't happen. | |
968 | */ | |
969 | ||
970 | mutex_lock(&sdata->local->key_mtx); | |
f9dca80b MK |
971 | decrease_tailroom_need_count(sdata, |
972 | sdata->crypto_tx_tailroom_pending_dec); | |
8d1f7ecd JB |
973 | sdata->crypto_tx_tailroom_pending_dec = 0; |
974 | mutex_unlock(&sdata->local->key_mtx); | |
975 | } | |
c68f4b89 JB |
976 | |
977 | void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid, | |
978 | const u8 *replay_ctr, gfp_t gfp) | |
979 | { | |
980 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
981 | ||
982 | trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr); | |
983 | ||
984 | cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp); | |
985 | } | |
986 | EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify); | |
3ea542d3 | 987 | |
3ea542d3 JB |
988 | void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf, |
989 | int tid, struct ieee80211_key_seq *seq) | |
990 | { | |
991 | struct ieee80211_key *key; | |
992 | const u8 *pn; | |
993 | ||
994 | key = container_of(keyconf, struct ieee80211_key, conf); | |
995 | ||
996 | switch (key->conf.cipher) { | |
997 | case WLAN_CIPHER_SUITE_TKIP: | |
5a306f58 | 998 | if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) |
3ea542d3 JB |
999 | return; |
1000 | seq->tkip.iv32 = key->u.tkip.rx[tid].iv32; | |
1001 | seq->tkip.iv16 = key->u.tkip.rx[tid].iv16; | |
1002 | break; | |
1003 | case WLAN_CIPHER_SUITE_CCMP: | |
2b2ba0db | 1004 | case WLAN_CIPHER_SUITE_CCMP_256: |
5a306f58 | 1005 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) |
3ea542d3 JB |
1006 | return; |
1007 | if (tid < 0) | |
5a306f58 | 1008 | pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; |
3ea542d3 JB |
1009 | else |
1010 | pn = key->u.ccmp.rx_pn[tid]; | |
4325f6ca | 1011 | memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN); |
3ea542d3 JB |
1012 | break; |
1013 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
56c52da2 | 1014 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
3ea542d3 JB |
1015 | if (WARN_ON(tid != 0)) |
1016 | return; | |
1017 | pn = key->u.aes_cmac.rx_pn; | |
4325f6ca | 1018 | memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN); |
3ea542d3 | 1019 | break; |
8ade538b JM |
1020 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
1021 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
1022 | if (WARN_ON(tid != 0)) | |
1023 | return; | |
1024 | pn = key->u.aes_gmac.rx_pn; | |
1025 | memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN); | |
1026 | break; | |
00b9cfa3 JM |
1027 | case WLAN_CIPHER_SUITE_GCMP: |
1028 | case WLAN_CIPHER_SUITE_GCMP_256: | |
1029 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) | |
1030 | return; | |
1031 | if (tid < 0) | |
1032 | pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; | |
1033 | else | |
1034 | pn = key->u.gcmp.rx_pn[tid]; | |
1035 | memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN); | |
1036 | break; | |
3ea542d3 JB |
1037 | } |
1038 | } | |
1039 | EXPORT_SYMBOL(ieee80211_get_key_rx_seq); | |
27b3eb9c | 1040 | |
27b3eb9c JB |
1041 | void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf, |
1042 | int tid, struct ieee80211_key_seq *seq) | |
1043 | { | |
1044 | struct ieee80211_key *key; | |
1045 | u8 *pn; | |
1046 | ||
1047 | key = container_of(keyconf, struct ieee80211_key, conf); | |
1048 | ||
1049 | switch (key->conf.cipher) { | |
1050 | case WLAN_CIPHER_SUITE_TKIP: | |
1051 | if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) | |
1052 | return; | |
1053 | key->u.tkip.rx[tid].iv32 = seq->tkip.iv32; | |
1054 | key->u.tkip.rx[tid].iv16 = seq->tkip.iv16; | |
1055 | break; | |
1056 | case WLAN_CIPHER_SUITE_CCMP: | |
2b2ba0db | 1057 | case WLAN_CIPHER_SUITE_CCMP_256: |
27b3eb9c JB |
1058 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) |
1059 | return; | |
1060 | if (tid < 0) | |
1061 | pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; | |
1062 | else | |
1063 | pn = key->u.ccmp.rx_pn[tid]; | |
1064 | memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN); | |
1065 | break; | |
1066 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
56c52da2 | 1067 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
27b3eb9c JB |
1068 | if (WARN_ON(tid != 0)) |
1069 | return; | |
1070 | pn = key->u.aes_cmac.rx_pn; | |
1071 | memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN); | |
1072 | break; | |
8ade538b JM |
1073 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
1074 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
1075 | if (WARN_ON(tid != 0)) | |
1076 | return; | |
1077 | pn = key->u.aes_gmac.rx_pn; | |
1078 | memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN); | |
1079 | break; | |
00b9cfa3 JM |
1080 | case WLAN_CIPHER_SUITE_GCMP: |
1081 | case WLAN_CIPHER_SUITE_GCMP_256: | |
1082 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) | |
1083 | return; | |
1084 | if (tid < 0) | |
1085 | pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; | |
1086 | else | |
1087 | pn = key->u.gcmp.rx_pn[tid]; | |
1088 | memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN); | |
1089 | break; | |
27b3eb9c JB |
1090 | default: |
1091 | WARN_ON(1); | |
1092 | break; | |
1093 | } | |
1094 | } | |
1095 | EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq); | |
1096 | ||
1097 | void ieee80211_remove_key(struct ieee80211_key_conf *keyconf) | |
1098 | { | |
1099 | struct ieee80211_key *key; | |
1100 | ||
1101 | key = container_of(keyconf, struct ieee80211_key, conf); | |
1102 | ||
1103 | assert_key_lock(key->local); | |
1104 | ||
1105 | /* | |
1106 | * if key was uploaded, we assume the driver will/has remove(d) | |
1107 | * it, so adjust bookkeeping accordingly | |
1108 | */ | |
1109 | if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { | |
1110 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; | |
1111 | ||
9de18d81 DS |
1112 | if (!((key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | |
1113 | IEEE80211_KEY_FLAG_PUT_MIC_SPACE)) || | |
db12847c | 1114 | (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) |
27b3eb9c JB |
1115 | increment_tailroom_need_count(key->sdata); |
1116 | } | |
1117 | ||
1118 | ieee80211_key_free(key, false); | |
1119 | } | |
1120 | EXPORT_SYMBOL_GPL(ieee80211_remove_key); | |
1121 | ||
1122 | struct ieee80211_key_conf * | |
1123 | ieee80211_gtk_rekey_add(struct ieee80211_vif *vif, | |
1124 | struct ieee80211_key_conf *keyconf) | |
1125 | { | |
1126 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
1127 | struct ieee80211_local *local = sdata->local; | |
1128 | struct ieee80211_key *key; | |
1129 | int err; | |
1130 | ||
1131 | if (WARN_ON(!local->wowlan)) | |
1132 | return ERR_PTR(-EINVAL); | |
1133 | ||
1134 | if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) | |
1135 | return ERR_PTR(-EINVAL); | |
1136 | ||
1137 | key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx, | |
1138 | keyconf->keylen, keyconf->key, | |
2475b1cc | 1139 | 0, NULL, NULL); |
27b3eb9c | 1140 | if (IS_ERR(key)) |
c5dc164d | 1141 | return ERR_CAST(key); |
27b3eb9c JB |
1142 | |
1143 | if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED) | |
1144 | key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT; | |
1145 | ||
1146 | err = ieee80211_key_link(key, sdata, NULL); | |
1147 | if (err) | |
1148 | return ERR_PTR(err); | |
1149 | ||
1150 | return &key->conf; | |
1151 | } | |
1152 | EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add); |