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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 | |
1e359a5d | 181 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
db12847c | 182 | (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) |
f9dca80b | 183 | decrease_tailroom_need_count(sdata, 1); |
3bff1865 | 184 | |
077a9154 AN |
185 | WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && |
186 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)); | |
187 | ||
e31b8213 JB |
188 | return 0; |
189 | } | |
11a843b7 | 190 | |
fa7e1fbc | 191 | if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1) |
bdcbd8e0 | 192 | sdata_err(sdata, |
0fb9a9ec | 193 | "failed to set key (%d, %pM) to hardware (%d)\n", |
89c91cae JB |
194 | key->conf.keyidx, |
195 | sta ? sta->sta.addr : bcast_addr, ret); | |
3ffc2a90 | 196 | |
e31b8213 JB |
197 | out_unsupported: |
198 | switch (key->conf.cipher) { | |
199 | case WLAN_CIPHER_SUITE_WEP40: | |
200 | case WLAN_CIPHER_SUITE_WEP104: | |
201 | case WLAN_CIPHER_SUITE_TKIP: | |
202 | case WLAN_CIPHER_SUITE_CCMP: | |
2b2ba0db | 203 | case WLAN_CIPHER_SUITE_CCMP_256: |
e31b8213 | 204 | case WLAN_CIPHER_SUITE_AES_CMAC: |
56c52da2 | 205 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
8ade538b JM |
206 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
207 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
00b9cfa3 JM |
208 | case WLAN_CIPHER_SUITE_GCMP: |
209 | case WLAN_CIPHER_SUITE_GCMP_256: | |
fa7e1fbc JB |
210 | /* all of these we can do in software - if driver can */ |
211 | if (ret == 1) | |
212 | return 0; | |
30686bf7 | 213 | if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL)) |
fa7e1fbc | 214 | return -EINVAL; |
e31b8213 JB |
215 | return 0; |
216 | default: | |
217 | return -EINVAL; | |
3ffc2a90 | 218 | } |
11a843b7 JB |
219 | } |
220 | ||
221 | static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key) | |
222 | { | |
dc822b5d | 223 | struct ieee80211_sub_if_data *sdata; |
89c91cae | 224 | struct sta_info *sta; |
11a843b7 JB |
225 | int ret; |
226 | ||
3b96766f JB |
227 | might_sleep(); |
228 | ||
db4d1169 | 229 | if (!key || !key->local->ops->set_key) |
11a843b7 JB |
230 | return; |
231 | ||
ad0e2b5a JB |
232 | assert_key_lock(key->local); |
233 | ||
234 | if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) | |
11a843b7 JB |
235 | return; |
236 | ||
89c91cae | 237 | sta = key->sta; |
dc822b5d JB |
238 | sdata = key->sdata; |
239 | ||
1e359a5d | 240 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
db12847c | 241 | (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) |
3bff1865 YAP |
242 | increment_tailroom_need_count(sdata); |
243 | ||
12375ef9 | 244 | ret = drv_set_key(key->local, DISABLE_KEY, sdata, |
89c91cae | 245 | sta ? &sta->sta : NULL, &key->conf); |
11a843b7 JB |
246 | |
247 | if (ret) | |
bdcbd8e0 | 248 | sdata_err(sdata, |
0fb9a9ec | 249 | "failed to remove key (%d, %pM) from hardware (%d)\n", |
89c91cae JB |
250 | key->conf.keyidx, |
251 | sta ? sta->sta.addr : bcast_addr, ret); | |
11a843b7 | 252 | |
3b96766f | 253 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; |
3b96766f JB |
254 | } |
255 | ||
256 | static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, | |
f7e0104c | 257 | int idx, bool uni, bool multi) |
3b96766f JB |
258 | { |
259 | struct ieee80211_key *key = NULL; | |
260 | ||
ad0e2b5a JB |
261 | assert_key_lock(sdata->local); |
262 | ||
3b96766f | 263 | if (idx >= 0 && idx < NUM_DEFAULT_KEYS) |
40b275b6 | 264 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
3b96766f | 265 | |
de5fad81 | 266 | if (uni) { |
f7e0104c | 267 | rcu_assign_pointer(sdata->default_unicast_key, key); |
17c18bf8 | 268 | ieee80211_check_fast_xmit_iface(sdata); |
ec4efc4a JB |
269 | if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) |
270 | drv_set_default_unicast_key(sdata->local, sdata, idx); | |
de5fad81 YD |
271 | } |
272 | ||
f7e0104c JB |
273 | if (multi) |
274 | rcu_assign_pointer(sdata->default_multicast_key, key); | |
3b96766f | 275 | |
f7e0104c | 276 | ieee80211_debugfs_key_update_default(sdata); |
3b96766f JB |
277 | } |
278 | ||
f7e0104c JB |
279 | void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx, |
280 | bool uni, bool multi) | |
3b96766f | 281 | { |
ad0e2b5a | 282 | mutex_lock(&sdata->local->key_mtx); |
f7e0104c | 283 | __ieee80211_set_default_key(sdata, idx, uni, multi); |
ad0e2b5a | 284 | mutex_unlock(&sdata->local->key_mtx); |
3b96766f JB |
285 | } |
286 | ||
3cfcf6ac JM |
287 | static void |
288 | __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx) | |
289 | { | |
290 | struct ieee80211_key *key = NULL; | |
291 | ||
ad0e2b5a JB |
292 | assert_key_lock(sdata->local); |
293 | ||
3cfcf6ac JM |
294 | if (idx >= NUM_DEFAULT_KEYS && |
295 | idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
40b275b6 | 296 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
3cfcf6ac JM |
297 | |
298 | rcu_assign_pointer(sdata->default_mgmt_key, key); | |
299 | ||
f7e0104c | 300 | ieee80211_debugfs_key_update_default(sdata); |
3cfcf6ac JM |
301 | } |
302 | ||
303 | void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, | |
304 | int idx) | |
305 | { | |
ad0e2b5a | 306 | mutex_lock(&sdata->local->key_mtx); |
3cfcf6ac | 307 | __ieee80211_set_default_mgmt_key(sdata, idx); |
ad0e2b5a | 308 | mutex_unlock(&sdata->local->key_mtx); |
3cfcf6ac JM |
309 | } |
310 | ||
3b96766f | 311 | |
3b8d9c29 JB |
312 | static void ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, |
313 | struct sta_info *sta, | |
314 | bool pairwise, | |
315 | struct ieee80211_key *old, | |
316 | struct ieee80211_key *new) | |
3b96766f | 317 | { |
f7e0104c JB |
318 | int idx; |
319 | bool defunikey, defmultikey, defmgmtkey; | |
3b96766f | 320 | |
5282c3ba JB |
321 | /* caller must provide at least one old/new */ |
322 | if (WARN_ON(!new && !old)) | |
323 | return; | |
324 | ||
3b96766f | 325 | if (new) |
ef044763 | 326 | list_add_tail_rcu(&new->list, &sdata->key_list); |
3b96766f | 327 | |
2475b1cc | 328 | WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx); |
3b96766f | 329 | |
2475b1cc MS |
330 | if (old) |
331 | idx = old->conf.keyidx; | |
332 | else | |
333 | idx = new->conf.keyidx; | |
3b96766f | 334 | |
2475b1cc MS |
335 | if (sta) { |
336 | if (pairwise) { | |
337 | rcu_assign_pointer(sta->ptk[idx], new); | |
338 | sta->ptk_idx = idx; | |
17c18bf8 | 339 | ieee80211_check_fast_xmit(sta); |
2475b1cc MS |
340 | } else { |
341 | rcu_assign_pointer(sta->gtk[idx], new); | |
2475b1cc | 342 | } |
49ddf8e6 | 343 | ieee80211_check_fast_rx(sta); |
2475b1cc | 344 | } else { |
40b275b6 JB |
345 | defunikey = old && |
346 | old == key_mtx_dereference(sdata->local, | |
347 | sdata->default_unicast_key); | |
348 | defmultikey = old && | |
349 | old == key_mtx_dereference(sdata->local, | |
350 | sdata->default_multicast_key); | |
351 | defmgmtkey = old && | |
352 | old == key_mtx_dereference(sdata->local, | |
353 | sdata->default_mgmt_key); | |
3b96766f | 354 | |
f7e0104c JB |
355 | if (defunikey && !new) |
356 | __ieee80211_set_default_key(sdata, -1, true, false); | |
357 | if (defmultikey && !new) | |
358 | __ieee80211_set_default_key(sdata, -1, false, true); | |
3cfcf6ac JM |
359 | if (defmgmtkey && !new) |
360 | __ieee80211_set_default_mgmt_key(sdata, -1); | |
3b96766f JB |
361 | |
362 | rcu_assign_pointer(sdata->keys[idx], new); | |
f7e0104c JB |
363 | if (defunikey && new) |
364 | __ieee80211_set_default_key(sdata, new->conf.keyidx, | |
365 | true, false); | |
366 | if (defmultikey && new) | |
367 | __ieee80211_set_default_key(sdata, new->conf.keyidx, | |
368 | false, true); | |
3cfcf6ac JM |
369 | if (defmgmtkey && new) |
370 | __ieee80211_set_default_mgmt_key(sdata, | |
371 | new->conf.keyidx); | |
3b96766f JB |
372 | } |
373 | ||
b5c34f66 | 374 | if (old) |
ef044763 | 375 | list_del_rcu(&old->list); |
11a843b7 JB |
376 | } |
377 | ||
2475b1cc MS |
378 | struct ieee80211_key * |
379 | ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, | |
380 | const u8 *key_data, | |
381 | size_t seq_len, const u8 *seq, | |
382 | const struct ieee80211_cipher_scheme *cs) | |
1f5a7e47 JB |
383 | { |
384 | struct ieee80211_key *key; | |
1ac62ba7 | 385 | int i, j, err; |
1f5a7e47 | 386 | |
8c5bb1fa JB |
387 | if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)) |
388 | return ERR_PTR(-EINVAL); | |
11a843b7 JB |
389 | |
390 | key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); | |
1f5a7e47 | 391 | if (!key) |
1ac62ba7 | 392 | return ERR_PTR(-ENOMEM); |
11a843b7 JB |
393 | |
394 | /* | |
395 | * Default to software encryption; we'll later upload the | |
396 | * key to the hardware if possible. | |
397 | */ | |
11a843b7 JB |
398 | key->conf.flags = 0; |
399 | key->flags = 0; | |
400 | ||
97359d12 | 401 | key->conf.cipher = cipher; |
11a843b7 JB |
402 | key->conf.keyidx = idx; |
403 | key->conf.keylen = key_len; | |
97359d12 JB |
404 | switch (cipher) { |
405 | case WLAN_CIPHER_SUITE_WEP40: | |
406 | case WLAN_CIPHER_SUITE_WEP104: | |
4325f6ca JB |
407 | key->conf.iv_len = IEEE80211_WEP_IV_LEN; |
408 | key->conf.icv_len = IEEE80211_WEP_ICV_LEN; | |
76708dee | 409 | break; |
97359d12 | 410 | case WLAN_CIPHER_SUITE_TKIP: |
4325f6ca JB |
411 | key->conf.iv_len = IEEE80211_TKIP_IV_LEN; |
412 | key->conf.icv_len = IEEE80211_TKIP_ICV_LEN; | |
9f26a952 | 413 | if (seq) { |
5a306f58 | 414 | for (i = 0; i < IEEE80211_NUM_TIDS; i++) { |
faa8fdc8 JM |
415 | key->u.tkip.rx[i].iv32 = |
416 | get_unaligned_le32(&seq[2]); | |
417 | key->u.tkip.rx[i].iv16 = | |
418 | get_unaligned_le16(seq); | |
419 | } | |
420 | } | |
523b02ea | 421 | spin_lock_init(&key->u.tkip.txlock); |
76708dee | 422 | break; |
97359d12 | 423 | case WLAN_CIPHER_SUITE_CCMP: |
4325f6ca JB |
424 | key->conf.iv_len = IEEE80211_CCMP_HDR_LEN; |
425 | key->conf.icv_len = IEEE80211_CCMP_MIC_LEN; | |
9f26a952 | 426 | if (seq) { |
5a306f58 | 427 | for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) |
4325f6ca | 428 | for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++) |
faa8fdc8 | 429 | key->u.ccmp.rx_pn[i][j] = |
4325f6ca | 430 | seq[IEEE80211_CCMP_PN_LEN - j - 1]; |
faa8fdc8 | 431 | } |
11a843b7 JB |
432 | /* |
433 | * Initialize AES key state here as an optimization so that | |
434 | * it does not need to be initialized for every packet. | |
435 | */ | |
2b2ba0db JM |
436 | key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt( |
437 | key_data, key_len, IEEE80211_CCMP_MIC_LEN); | |
438 | if (IS_ERR(key->u.ccmp.tfm)) { | |
439 | err = PTR_ERR(key->u.ccmp.tfm); | |
440 | kfree(key); | |
441 | return ERR_PTR(err); | |
442 | } | |
443 | break; | |
444 | case WLAN_CIPHER_SUITE_CCMP_256: | |
445 | key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN; | |
446 | key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN; | |
447 | for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++) | |
448 | for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++) | |
449 | key->u.ccmp.rx_pn[i][j] = | |
450 | seq[IEEE80211_CCMP_256_PN_LEN - j - 1]; | |
451 | /* Initialize AES key state here as an optimization so that | |
452 | * it does not need to be initialized for every packet. | |
453 | */ | |
454 | key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt( | |
455 | key_data, key_len, IEEE80211_CCMP_256_MIC_LEN); | |
1ac62ba7 BH |
456 | if (IS_ERR(key->u.ccmp.tfm)) { |
457 | err = PTR_ERR(key->u.ccmp.tfm); | |
3b96766f | 458 | kfree(key); |
1f951a7f | 459 | return ERR_PTR(err); |
11a843b7 | 460 | } |
60ae0f20 JB |
461 | break; |
462 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
56c52da2 | 463 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
60ae0f20 | 464 | key->conf.iv_len = 0; |
56c52da2 JM |
465 | if (cipher == WLAN_CIPHER_SUITE_AES_CMAC) |
466 | key->conf.icv_len = sizeof(struct ieee80211_mmie); | |
467 | else | |
468 | key->conf.icv_len = sizeof(struct ieee80211_mmie_16); | |
60ae0f20 | 469 | if (seq) |
4325f6ca | 470 | for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++) |
0f927323 | 471 | key->u.aes_cmac.rx_pn[j] = |
4325f6ca | 472 | seq[IEEE80211_CMAC_PN_LEN - j - 1]; |
3cfcf6ac JM |
473 | /* |
474 | * Initialize AES key state here as an optimization so that | |
475 | * it does not need to be initialized for every packet. | |
476 | */ | |
477 | key->u.aes_cmac.tfm = | |
56c52da2 | 478 | ieee80211_aes_cmac_key_setup(key_data, key_len); |
1ac62ba7 BH |
479 | if (IS_ERR(key->u.aes_cmac.tfm)) { |
480 | err = PTR_ERR(key->u.aes_cmac.tfm); | |
3cfcf6ac | 481 | kfree(key); |
1f951a7f | 482 | return ERR_PTR(err); |
3cfcf6ac | 483 | } |
60ae0f20 | 484 | break; |
8ade538b JM |
485 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
486 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
487 | key->conf.iv_len = 0; | |
488 | key->conf.icv_len = sizeof(struct ieee80211_mmie_16); | |
489 | if (seq) | |
490 | for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++) | |
491 | key->u.aes_gmac.rx_pn[j] = | |
492 | seq[IEEE80211_GMAC_PN_LEN - j - 1]; | |
493 | /* Initialize AES key state here as an optimization so that | |
494 | * it does not need to be initialized for every packet. | |
495 | */ | |
496 | key->u.aes_gmac.tfm = | |
497 | ieee80211_aes_gmac_key_setup(key_data, key_len); | |
498 | if (IS_ERR(key->u.aes_gmac.tfm)) { | |
499 | err = PTR_ERR(key->u.aes_gmac.tfm); | |
500 | kfree(key); | |
501 | return ERR_PTR(err); | |
502 | } | |
503 | break; | |
00b9cfa3 JM |
504 | case WLAN_CIPHER_SUITE_GCMP: |
505 | case WLAN_CIPHER_SUITE_GCMP_256: | |
506 | key->conf.iv_len = IEEE80211_GCMP_HDR_LEN; | |
507 | key->conf.icv_len = IEEE80211_GCMP_MIC_LEN; | |
508 | for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++) | |
509 | for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++) | |
510 | key->u.gcmp.rx_pn[i][j] = | |
511 | seq[IEEE80211_GCMP_PN_LEN - j - 1]; | |
512 | /* Initialize AES key state here as an optimization so that | |
513 | * it does not need to be initialized for every packet. | |
514 | */ | |
515 | key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data, | |
516 | key_len); | |
517 | if (IS_ERR(key->u.gcmp.tfm)) { | |
518 | err = PTR_ERR(key->u.gcmp.tfm); | |
519 | kfree(key); | |
520 | return ERR_PTR(err); | |
521 | } | |
522 | break; | |
2475b1cc MS |
523 | default: |
524 | if (cs) { | |
e3a55b53 JB |
525 | if (seq_len && seq_len != cs->pn_len) { |
526 | kfree(key); | |
527 | return ERR_PTR(-EINVAL); | |
528 | } | |
2475b1cc MS |
529 | |
530 | key->conf.iv_len = cs->hdr_len; | |
531 | key->conf.icv_len = cs->mic_len; | |
532 | for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) | |
e3a55b53 | 533 | for (j = 0; j < seq_len; j++) |
2475b1cc | 534 | key->u.gen.rx_pn[i][j] = |
e3a55b53 | 535 | seq[seq_len - j - 1]; |
c7ef38e0 | 536 | key->flags |= KEY_FLAG_CIPHER_SCHEME; |
2475b1cc | 537 | } |
3cfcf6ac | 538 | } |
60ae0f20 JB |
539 | memcpy(key->conf.key, key_data, key_len); |
540 | INIT_LIST_HEAD(&key->list); | |
3cfcf6ac | 541 | |
db4d1169 JB |
542 | return key; |
543 | } | |
11a843b7 | 544 | |
79cf2dfa JB |
545 | static void ieee80211_key_free_common(struct ieee80211_key *key) |
546 | { | |
00b9cfa3 JM |
547 | switch (key->conf.cipher) { |
548 | case WLAN_CIPHER_SUITE_CCMP: | |
2b2ba0db | 549 | case WLAN_CIPHER_SUITE_CCMP_256: |
79cf2dfa | 550 | ieee80211_aes_key_free(key->u.ccmp.tfm); |
00b9cfa3 JM |
551 | break; |
552 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
56c52da2 | 553 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
79cf2dfa | 554 | ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); |
00b9cfa3 | 555 | break; |
8ade538b JM |
556 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
557 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
558 | ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm); | |
559 | break; | |
00b9cfa3 JM |
560 | case WLAN_CIPHER_SUITE_GCMP: |
561 | case WLAN_CIPHER_SUITE_GCMP_256: | |
562 | ieee80211_aes_gcm_key_free(key->u.gcmp.tfm); | |
563 | break; | |
564 | } | |
29c3f9c3 | 565 | kzfree(key); |
79cf2dfa JB |
566 | } |
567 | ||
6d10e46b JB |
568 | static void __ieee80211_key_destroy(struct ieee80211_key *key, |
569 | bool delay_tailroom) | |
ad0e2b5a | 570 | { |
32162a4d JM |
571 | if (key->local) |
572 | ieee80211_key_disable_hw_accel(key); | |
ad0e2b5a | 573 | |
3bff1865 | 574 | if (key->local) { |
8d1f7ecd JB |
575 | struct ieee80211_sub_if_data *sdata = key->sdata; |
576 | ||
32162a4d | 577 | ieee80211_debugfs_key_remove(key); |
8d1f7ecd JB |
578 | |
579 | if (delay_tailroom) { | |
580 | /* see ieee80211_delayed_tailroom_dec */ | |
581 | sdata->crypto_tx_tailroom_pending_dec++; | |
582 | schedule_delayed_work(&sdata->dec_tailroom_needed_wk, | |
583 | HZ/2); | |
584 | } else { | |
f9dca80b | 585 | decrease_tailroom_need_count(sdata, 1); |
8d1f7ecd | 586 | } |
3bff1865 | 587 | } |
ad0e2b5a | 588 | |
79cf2dfa JB |
589 | ieee80211_key_free_common(key); |
590 | } | |
591 | ||
6d10e46b JB |
592 | static void ieee80211_key_destroy(struct ieee80211_key *key, |
593 | bool delay_tailroom) | |
594 | { | |
595 | if (!key) | |
596 | return; | |
597 | ||
598 | /* | |
ef044763 EP |
599 | * Synchronize so the TX path and rcu key iterators |
600 | * can no longer be using this key before we free/remove it. | |
6d10e46b JB |
601 | */ |
602 | synchronize_net(); | |
603 | ||
604 | __ieee80211_key_destroy(key, delay_tailroom); | |
605 | } | |
606 | ||
79cf2dfa JB |
607 | void ieee80211_key_free_unused(struct ieee80211_key *key) |
608 | { | |
609 | WARN_ON(key->sdata || key->local); | |
610 | ieee80211_key_free_common(key); | |
ad0e2b5a JB |
611 | } |
612 | ||
cfbb0d90 JB |
613 | static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata, |
614 | struct ieee80211_key *old, | |
615 | struct ieee80211_key *new) | |
616 | { | |
617 | u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP]; | |
618 | u8 *tk_old, *tk_new; | |
619 | ||
620 | if (!old || new->conf.keylen != old->conf.keylen) | |
621 | return false; | |
622 | ||
623 | tk_old = old->conf.key; | |
624 | tk_new = new->conf.key; | |
625 | ||
626 | /* | |
627 | * In station mode, don't compare the TX MIC key, as it's never used | |
628 | * and offloaded rekeying may not care to send it to the host. This | |
629 | * is the case in iwlwifi, for example. | |
630 | */ | |
631 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
632 | new->conf.cipher == WLAN_CIPHER_SUITE_TKIP && | |
633 | new->conf.keylen == WLAN_KEY_LEN_TKIP && | |
634 | !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) { | |
635 | memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP); | |
636 | memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP); | |
637 | memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8); | |
638 | memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8); | |
639 | tk_old = tkip_old; | |
640 | tk_new = tkip_new; | |
641 | } | |
642 | ||
643 | return !crypto_memneq(tk_old, tk_new, new->conf.keylen); | |
644 | } | |
645 | ||
3ffc2a90 JB |
646 | int ieee80211_key_link(struct ieee80211_key *key, |
647 | struct ieee80211_sub_if_data *sdata, | |
648 | struct sta_info *sta) | |
db4d1169 | 649 | { |
27b3eb9c | 650 | struct ieee80211_local *local = sdata->local; |
db4d1169 | 651 | struct ieee80211_key *old_key; |
3ffc2a90 | 652 | int idx, ret; |
67aa030c | 653 | bool pairwise; |
db4d1169 | 654 | |
67aa030c | 655 | pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE; |
db4d1169 | 656 | idx = key->conf.keyidx; |
db4d1169 | 657 | |
ad0e2b5a | 658 | mutex_lock(&sdata->local->key_mtx); |
3b96766f | 659 | |
e31b8213 | 660 | if (sta && pairwise) |
2475b1cc | 661 | old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]); |
e31b8213 | 662 | else if (sta) |
40b275b6 | 663 | old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]); |
d4e46a3d | 664 | else |
40b275b6 | 665 | old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
db4d1169 | 666 | |
fdf7cb41 JB |
667 | /* |
668 | * Silently accept key re-installation without really installing the | |
669 | * new version of the key to avoid nonce reuse or replay issues. | |
670 | */ | |
cfbb0d90 | 671 | if (ieee80211_key_identical(sdata, old_key, key)) { |
fdf7cb41 JB |
672 | ieee80211_key_free_unused(key); |
673 | ret = 0; | |
674 | goto out; | |
675 | } | |
676 | ||
677 | key->local = sdata->local; | |
678 | key->sdata = sdata; | |
679 | key->sta = sta; | |
680 | ||
3bff1865 YAP |
681 | increment_tailroom_need_count(sdata); |
682 | ||
3b8d9c29 JB |
683 | ieee80211_key_replace(sdata, sta, pairwise, old_key, key); |
684 | ieee80211_key_destroy(old_key, true); | |
d4e46a3d | 685 | |
ad0e2b5a | 686 | ieee80211_debugfs_key_add(key); |
db4d1169 | 687 | |
27b3eb9c JB |
688 | if (!local->wowlan) { |
689 | ret = ieee80211_key_enable_hw_accel(key); | |
690 | if (ret) | |
691 | ieee80211_key_free(key, true); | |
692 | } else { | |
693 | ret = 0; | |
694 | } | |
79cf2dfa | 695 | |
fdf7cb41 | 696 | out: |
ad0e2b5a | 697 | mutex_unlock(&sdata->local->key_mtx); |
3ffc2a90 JB |
698 | |
699 | return ret; | |
1f5a7e47 JB |
700 | } |
701 | ||
3b8d9c29 | 702 | void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom) |
1f5a7e47 | 703 | { |
5c0c3641 JB |
704 | if (!key) |
705 | return; | |
706 | ||
3b96766f JB |
707 | /* |
708 | * Replace key with nothingness if it was ever used. | |
709 | */ | |
3a245766 | 710 | if (key->sdata) |
3b8d9c29 | 711 | ieee80211_key_replace(key->sdata, key->sta, |
e31b8213 JB |
712 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, |
713 | key, NULL); | |
3b8d9c29 | 714 | ieee80211_key_destroy(key, delay_tailroom); |
3b96766f | 715 | } |
d4e46a3d | 716 | |
ad0e2b5a | 717 | void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata) |
3a245766 JB |
718 | { |
719 | struct ieee80211_key *key; | |
f9dca80b | 720 | struct ieee80211_sub_if_data *vlan; |
11a843b7 | 721 | |
3a245766 | 722 | ASSERT_RTNL(); |
11a843b7 | 723 | |
9607e6b6 | 724 | if (WARN_ON(!ieee80211_sdata_running(sdata))) |
3a245766 | 725 | return; |
11a843b7 | 726 | |
ad0e2b5a | 727 | mutex_lock(&sdata->local->key_mtx); |
11a843b7 | 728 | |
f9dca80b MK |
729 | WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || |
730 | sdata->crypto_tx_tailroom_pending_dec); | |
731 | ||
732 | if (sdata->vif.type == NL80211_IFTYPE_AP) { | |
733 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
734 | WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt || | |
735 | vlan->crypto_tx_tailroom_pending_dec); | |
736 | } | |
3bff1865 YAP |
737 | |
738 | list_for_each_entry(key, &sdata->key_list, list) { | |
739 | increment_tailroom_need_count(sdata); | |
ad0e2b5a | 740 | ieee80211_key_enable_hw_accel(key); |
3bff1865 | 741 | } |
3b96766f | 742 | |
ad0e2b5a | 743 | mutex_unlock(&sdata->local->key_mtx); |
11a843b7 JB |
744 | } |
745 | ||
f9dca80b MK |
746 | void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata) |
747 | { | |
748 | struct ieee80211_sub_if_data *vlan; | |
749 | ||
750 | mutex_lock(&sdata->local->key_mtx); | |
751 | ||
752 | sdata->crypto_tx_tailroom_needed_cnt = 0; | |
753 | ||
754 | if (sdata->vif.type == NL80211_IFTYPE_AP) { | |
755 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
756 | vlan->crypto_tx_tailroom_needed_cnt = 0; | |
757 | } | |
758 | ||
759 | mutex_unlock(&sdata->local->key_mtx); | |
760 | } | |
761 | ||
830af02f JB |
762 | void ieee80211_iter_keys(struct ieee80211_hw *hw, |
763 | struct ieee80211_vif *vif, | |
764 | void (*iter)(struct ieee80211_hw *hw, | |
765 | struct ieee80211_vif *vif, | |
766 | struct ieee80211_sta *sta, | |
767 | struct ieee80211_key_conf *key, | |
768 | void *data), | |
769 | void *iter_data) | |
770 | { | |
771 | struct ieee80211_local *local = hw_to_local(hw); | |
27b3eb9c | 772 | struct ieee80211_key *key, *tmp; |
830af02f JB |
773 | struct ieee80211_sub_if_data *sdata; |
774 | ||
775 | ASSERT_RTNL(); | |
776 | ||
777 | mutex_lock(&local->key_mtx); | |
778 | if (vif) { | |
779 | sdata = vif_to_sdata(vif); | |
27b3eb9c | 780 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) |
830af02f JB |
781 | iter(hw, &sdata->vif, |
782 | key->sta ? &key->sta->sta : NULL, | |
783 | &key->conf, iter_data); | |
784 | } else { | |
785 | list_for_each_entry(sdata, &local->interfaces, list) | |
27b3eb9c JB |
786 | list_for_each_entry_safe(key, tmp, |
787 | &sdata->key_list, list) | |
830af02f JB |
788 | iter(hw, &sdata->vif, |
789 | key->sta ? &key->sta->sta : NULL, | |
790 | &key->conf, iter_data); | |
791 | } | |
792 | mutex_unlock(&local->key_mtx); | |
793 | } | |
794 | EXPORT_SYMBOL(ieee80211_iter_keys); | |
795 | ||
ef044763 EP |
796 | static void |
797 | _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw, | |
798 | struct ieee80211_sub_if_data *sdata, | |
799 | void (*iter)(struct ieee80211_hw *hw, | |
800 | struct ieee80211_vif *vif, | |
801 | struct ieee80211_sta *sta, | |
802 | struct ieee80211_key_conf *key, | |
803 | void *data), | |
804 | void *iter_data) | |
805 | { | |
806 | struct ieee80211_key *key; | |
807 | ||
808 | list_for_each_entry_rcu(key, &sdata->key_list, list) { | |
809 | /* skip keys of station in removal process */ | |
810 | if (key->sta && key->sta->removed) | |
811 | continue; | |
812 | if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) | |
813 | continue; | |
814 | ||
815 | iter(hw, &sdata->vif, | |
816 | key->sta ? &key->sta->sta : NULL, | |
817 | &key->conf, iter_data); | |
818 | } | |
819 | } | |
820 | ||
821 | void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw, | |
822 | struct ieee80211_vif *vif, | |
823 | void (*iter)(struct ieee80211_hw *hw, | |
824 | struct ieee80211_vif *vif, | |
825 | struct ieee80211_sta *sta, | |
826 | struct ieee80211_key_conf *key, | |
827 | void *data), | |
828 | void *iter_data) | |
829 | { | |
830 | struct ieee80211_local *local = hw_to_local(hw); | |
831 | struct ieee80211_sub_if_data *sdata; | |
832 | ||
833 | if (vif) { | |
834 | sdata = vif_to_sdata(vif); | |
835 | _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data); | |
836 | } else { | |
837 | list_for_each_entry_rcu(sdata, &local->interfaces, list) | |
838 | _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data); | |
839 | } | |
840 | } | |
841 | EXPORT_SYMBOL(ieee80211_iter_keys_rcu); | |
842 | ||
7907c7d3 JB |
843 | static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata, |
844 | struct list_head *keys) | |
3b96766f JB |
845 | { |
846 | struct ieee80211_key *key, *tmp; | |
3b96766f | 847 | |
f9dca80b MK |
848 | decrease_tailroom_need_count(sdata, |
849 | sdata->crypto_tx_tailroom_pending_dec); | |
8d1f7ecd JB |
850 | sdata->crypto_tx_tailroom_pending_dec = 0; |
851 | ||
3cfcf6ac | 852 | ieee80211_debugfs_key_remove_mgmt_default(sdata); |
3b96766f | 853 | |
6d10e46b JB |
854 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) { |
855 | ieee80211_key_replace(key->sdata, key->sta, | |
856 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
857 | key, NULL); | |
7907c7d3 | 858 | list_add_tail(&key->list, keys); |
6d10e46b | 859 | } |
3b96766f | 860 | |
f7e0104c | 861 | ieee80211_debugfs_key_update_default(sdata); |
7907c7d3 | 862 | } |
f7e0104c | 863 | |
7907c7d3 JB |
864 | void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata, |
865 | bool force_synchronize) | |
866 | { | |
867 | struct ieee80211_local *local = sdata->local; | |
868 | struct ieee80211_sub_if_data *vlan; | |
f9dca80b | 869 | struct ieee80211_sub_if_data *master; |
7907c7d3 JB |
870 | struct ieee80211_key *key, *tmp; |
871 | LIST_HEAD(keys); | |
872 | ||
873 | cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk); | |
874 | ||
875 | mutex_lock(&local->key_mtx); | |
876 | ||
877 | ieee80211_free_keys_iface(sdata, &keys); | |
878 | ||
879 | if (sdata->vif.type == NL80211_IFTYPE_AP) { | |
880 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
881 | ieee80211_free_keys_iface(vlan, &keys); | |
6d10e46b JB |
882 | } |
883 | ||
7907c7d3 JB |
884 | if (!list_empty(&keys) || force_synchronize) |
885 | synchronize_net(); | |
886 | list_for_each_entry_safe(key, tmp, &keys, list) | |
887 | __ieee80211_key_destroy(key, false); | |
888 | ||
f9dca80b MK |
889 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { |
890 | if (sdata->bss) { | |
891 | master = container_of(sdata->bss, | |
892 | struct ieee80211_sub_if_data, | |
893 | u.ap); | |
894 | ||
895 | WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt != | |
896 | master->crypto_tx_tailroom_needed_cnt); | |
897 | } | |
898 | } else { | |
899 | WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || | |
900 | sdata->crypto_tx_tailroom_pending_dec); | |
901 | } | |
902 | ||
7907c7d3 JB |
903 | if (sdata->vif.type == NL80211_IFTYPE_AP) { |
904 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
905 | WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt || | |
906 | vlan->crypto_tx_tailroom_pending_dec); | |
907 | } | |
8d1f7ecd | 908 | |
7907c7d3 | 909 | mutex_unlock(&local->key_mtx); |
11a843b7 | 910 | } |
c68f4b89 | 911 | |
6d10e46b JB |
912 | void ieee80211_free_sta_keys(struct ieee80211_local *local, |
913 | struct sta_info *sta) | |
914 | { | |
c8782078 | 915 | struct ieee80211_key *key; |
6d10e46b JB |
916 | int i; |
917 | ||
918 | mutex_lock(&local->key_mtx); | |
28a9bc68 | 919 | for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) { |
6d10e46b JB |
920 | key = key_mtx_dereference(local, sta->gtk[i]); |
921 | if (!key) | |
922 | continue; | |
923 | ieee80211_key_replace(key->sdata, key->sta, | |
924 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
925 | key, NULL); | |
c8782078 | 926 | __ieee80211_key_destroy(key, true); |
6d10e46b JB |
927 | } |
928 | ||
2475b1cc MS |
929 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { |
930 | key = key_mtx_dereference(local, sta->ptk[i]); | |
931 | if (!key) | |
932 | continue; | |
6d10e46b JB |
933 | ieee80211_key_replace(key->sdata, key->sta, |
934 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
935 | key, NULL); | |
6d10e46b | 936 | __ieee80211_key_destroy(key, true); |
c8782078 | 937 | } |
6d10e46b JB |
938 | |
939 | mutex_unlock(&local->key_mtx); | |
940 | } | |
941 | ||
8d1f7ecd JB |
942 | void ieee80211_delayed_tailroom_dec(struct work_struct *wk) |
943 | { | |
944 | struct ieee80211_sub_if_data *sdata; | |
945 | ||
946 | sdata = container_of(wk, struct ieee80211_sub_if_data, | |
947 | dec_tailroom_needed_wk.work); | |
948 | ||
949 | /* | |
950 | * The reason for the delayed tailroom needed decrementing is to | |
951 | * make roaming faster: during roaming, all keys are first deleted | |
952 | * and then new keys are installed. The first new key causes the | |
953 | * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes | |
954 | * the cost of synchronize_net() (which can be slow). Avoid this | |
955 | * by deferring the crypto_tx_tailroom_needed_cnt decrementing on | |
956 | * key removal for a while, so if we roam the value is larger than | |
957 | * zero and no 0->1 transition happens. | |
958 | * | |
959 | * The cost is that if the AP switching was from an AP with keys | |
960 | * to one without, we still allocate tailroom while it would no | |
961 | * longer be needed. However, in the typical (fast) roaming case | |
962 | * within an ESS this usually won't happen. | |
963 | */ | |
964 | ||
965 | mutex_lock(&sdata->local->key_mtx); | |
f9dca80b MK |
966 | decrease_tailroom_need_count(sdata, |
967 | sdata->crypto_tx_tailroom_pending_dec); | |
8d1f7ecd JB |
968 | sdata->crypto_tx_tailroom_pending_dec = 0; |
969 | mutex_unlock(&sdata->local->key_mtx); | |
970 | } | |
c68f4b89 JB |
971 | |
972 | void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid, | |
973 | const u8 *replay_ctr, gfp_t gfp) | |
974 | { | |
975 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
976 | ||
977 | trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr); | |
978 | ||
979 | cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp); | |
980 | } | |
981 | EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify); | |
3ea542d3 | 982 | |
3ea542d3 JB |
983 | void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf, |
984 | int tid, struct ieee80211_key_seq *seq) | |
985 | { | |
986 | struct ieee80211_key *key; | |
987 | const u8 *pn; | |
988 | ||
989 | key = container_of(keyconf, struct ieee80211_key, conf); | |
990 | ||
991 | switch (key->conf.cipher) { | |
992 | case WLAN_CIPHER_SUITE_TKIP: | |
5a306f58 | 993 | if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) |
3ea542d3 JB |
994 | return; |
995 | seq->tkip.iv32 = key->u.tkip.rx[tid].iv32; | |
996 | seq->tkip.iv16 = key->u.tkip.rx[tid].iv16; | |
997 | break; | |
998 | case WLAN_CIPHER_SUITE_CCMP: | |
2b2ba0db | 999 | case WLAN_CIPHER_SUITE_CCMP_256: |
5a306f58 | 1000 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) |
3ea542d3 JB |
1001 | return; |
1002 | if (tid < 0) | |
5a306f58 | 1003 | pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; |
3ea542d3 JB |
1004 | else |
1005 | pn = key->u.ccmp.rx_pn[tid]; | |
4325f6ca | 1006 | memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN); |
3ea542d3 JB |
1007 | break; |
1008 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
56c52da2 | 1009 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
3ea542d3 JB |
1010 | if (WARN_ON(tid != 0)) |
1011 | return; | |
1012 | pn = key->u.aes_cmac.rx_pn; | |
4325f6ca | 1013 | memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN); |
3ea542d3 | 1014 | break; |
8ade538b JM |
1015 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
1016 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
1017 | if (WARN_ON(tid != 0)) | |
1018 | return; | |
1019 | pn = key->u.aes_gmac.rx_pn; | |
1020 | memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN); | |
1021 | break; | |
00b9cfa3 JM |
1022 | case WLAN_CIPHER_SUITE_GCMP: |
1023 | case WLAN_CIPHER_SUITE_GCMP_256: | |
1024 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) | |
1025 | return; | |
1026 | if (tid < 0) | |
1027 | pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; | |
1028 | else | |
1029 | pn = key->u.gcmp.rx_pn[tid]; | |
1030 | memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN); | |
1031 | break; | |
3ea542d3 JB |
1032 | } |
1033 | } | |
1034 | EXPORT_SYMBOL(ieee80211_get_key_rx_seq); | |
27b3eb9c | 1035 | |
27b3eb9c JB |
1036 | void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf, |
1037 | int tid, struct ieee80211_key_seq *seq) | |
1038 | { | |
1039 | struct ieee80211_key *key; | |
1040 | u8 *pn; | |
1041 | ||
1042 | key = container_of(keyconf, struct ieee80211_key, conf); | |
1043 | ||
1044 | switch (key->conf.cipher) { | |
1045 | case WLAN_CIPHER_SUITE_TKIP: | |
1046 | if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) | |
1047 | return; | |
1048 | key->u.tkip.rx[tid].iv32 = seq->tkip.iv32; | |
1049 | key->u.tkip.rx[tid].iv16 = seq->tkip.iv16; | |
1050 | break; | |
1051 | case WLAN_CIPHER_SUITE_CCMP: | |
2b2ba0db | 1052 | case WLAN_CIPHER_SUITE_CCMP_256: |
27b3eb9c JB |
1053 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) |
1054 | return; | |
1055 | if (tid < 0) | |
1056 | pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; | |
1057 | else | |
1058 | pn = key->u.ccmp.rx_pn[tid]; | |
1059 | memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN); | |
1060 | break; | |
1061 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
56c52da2 | 1062 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
27b3eb9c JB |
1063 | if (WARN_ON(tid != 0)) |
1064 | return; | |
1065 | pn = key->u.aes_cmac.rx_pn; | |
1066 | memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN); | |
1067 | break; | |
8ade538b JM |
1068 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
1069 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
1070 | if (WARN_ON(tid != 0)) | |
1071 | return; | |
1072 | pn = key->u.aes_gmac.rx_pn; | |
1073 | memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN); | |
1074 | break; | |
00b9cfa3 JM |
1075 | case WLAN_CIPHER_SUITE_GCMP: |
1076 | case WLAN_CIPHER_SUITE_GCMP_256: | |
1077 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) | |
1078 | return; | |
1079 | if (tid < 0) | |
1080 | pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; | |
1081 | else | |
1082 | pn = key->u.gcmp.rx_pn[tid]; | |
1083 | memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN); | |
1084 | break; | |
27b3eb9c JB |
1085 | default: |
1086 | WARN_ON(1); | |
1087 | break; | |
1088 | } | |
1089 | } | |
1090 | EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq); | |
1091 | ||
1092 | void ieee80211_remove_key(struct ieee80211_key_conf *keyconf) | |
1093 | { | |
1094 | struct ieee80211_key *key; | |
1095 | ||
1096 | key = container_of(keyconf, struct ieee80211_key, conf); | |
1097 | ||
1098 | assert_key_lock(key->local); | |
1099 | ||
1100 | /* | |
1101 | * if key was uploaded, we assume the driver will/has remove(d) | |
1102 | * it, so adjust bookkeeping accordingly | |
1103 | */ | |
1104 | if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { | |
1105 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; | |
1106 | ||
1e359a5d | 1107 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
db12847c | 1108 | (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) |
27b3eb9c JB |
1109 | increment_tailroom_need_count(key->sdata); |
1110 | } | |
1111 | ||
1112 | ieee80211_key_free(key, false); | |
1113 | } | |
1114 | EXPORT_SYMBOL_GPL(ieee80211_remove_key); | |
1115 | ||
1116 | struct ieee80211_key_conf * | |
1117 | ieee80211_gtk_rekey_add(struct ieee80211_vif *vif, | |
1118 | struct ieee80211_key_conf *keyconf) | |
1119 | { | |
1120 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
1121 | struct ieee80211_local *local = sdata->local; | |
1122 | struct ieee80211_key *key; | |
1123 | int err; | |
1124 | ||
1125 | if (WARN_ON(!local->wowlan)) | |
1126 | return ERR_PTR(-EINVAL); | |
1127 | ||
1128 | if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) | |
1129 | return ERR_PTR(-EINVAL); | |
1130 | ||
1131 | key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx, | |
1132 | keyconf->keylen, keyconf->key, | |
2475b1cc | 1133 | 0, NULL, NULL); |
27b3eb9c | 1134 | if (IS_ERR(key)) |
c5dc164d | 1135 | return ERR_CAST(key); |
27b3eb9c JB |
1136 | |
1137 | if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED) | |
1138 | key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT; | |
1139 | ||
1140 | err = ieee80211_key_link(key, sdata, NULL); | |
1141 | if (err) | |
1142 | return ERR_PTR(err); | |
1143 | ||
1144 | return &key->conf; | |
1145 | } | |
1146 | EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add); |