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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 |
ef044763 | 7 | * Copyright 2015 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> |
d26ad377 | 22 | #include <asm/unaligned.h> |
1f5a7e47 | 23 | #include "ieee80211_i.h" |
24487981 | 24 | #include "driver-ops.h" |
1f5a7e47 JB |
25 | #include "debugfs_key.h" |
26 | #include "aes_ccm.h" | |
3cfcf6ac | 27 | #include "aes_cmac.h" |
8ade538b | 28 | #include "aes_gmac.h" |
00b9cfa3 | 29 | #include "aes_gcm.h" |
1f5a7e47 | 30 | |
11a843b7 | 31 | |
dbbea671 JB |
32 | /** |
33 | * DOC: Key handling basics | |
11a843b7 JB |
34 | * |
35 | * Key handling in mac80211 is done based on per-interface (sub_if_data) | |
36 | * keys and per-station keys. Since each station belongs to an interface, | |
37 | * each station key also belongs to that interface. | |
38 | * | |
b5c34f66 JB |
39 | * Hardware acceleration is done on a best-effort basis for algorithms |
40 | * that are implemented in software, for each key the hardware is asked | |
41 | * to enable that key for offloading but if it cannot do that the key is | |
42 | * simply kept for software encryption (unless it is for an algorithm | |
43 | * that isn't implemented in software). | |
44 | * There is currently no way of knowing whether a key is handled in SW | |
45 | * or HW except by looking into debugfs. | |
11a843b7 | 46 | * |
b5c34f66 JB |
47 | * All key management is internally protected by a mutex. Within all |
48 | * other parts of mac80211, key references are, just as STA structure | |
49 | * references, protected by RCU. Note, however, that some things are | |
50 | * unprotected, namely the key->sta dereferences within the hardware | |
51 | * acceleration functions. This means that sta_info_destroy() must | |
52 | * remove the key which waits for an RCU grace period. | |
11a843b7 JB |
53 | */ |
54 | ||
55 | static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; | |
11a843b7 | 56 | |
ad0e2b5a | 57 | static void assert_key_lock(struct ieee80211_local *local) |
3b96766f | 58 | { |
46a5ebaf | 59 | lockdep_assert_held(&local->key_mtx); |
3b96766f JB |
60 | } |
61 | ||
f9dca80b MK |
62 | static void |
63 | update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta) | |
64 | { | |
65 | struct ieee80211_sub_if_data *vlan; | |
66 | ||
67 | if (sdata->vif.type != NL80211_IFTYPE_AP) | |
68 | return; | |
69 | ||
51f458d9 JB |
70 | /* crypto_tx_tailroom_needed_cnt is protected by this */ |
71 | assert_key_lock(sdata->local); | |
f9dca80b | 72 | |
51f458d9 JB |
73 | rcu_read_lock(); |
74 | ||
75 | list_for_each_entry_rcu(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
f9dca80b MK |
76 | vlan->crypto_tx_tailroom_needed_cnt += delta; |
77 | ||
51f458d9 | 78 | rcu_read_unlock(); |
f9dca80b MK |
79 | } |
80 | ||
3bff1865 YAP |
81 | static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata) |
82 | { | |
83 | /* | |
84 | * When this count is zero, SKB resizing for allocating tailroom | |
85 | * for IV or MMIC is skipped. But, this check has created two race | |
86 | * cases in xmit path while transiting from zero count to one: | |
87 | * | |
88 | * 1. SKB resize was skipped because no key was added but just before | |
89 | * the xmit key is added and SW encryption kicks off. | |
90 | * | |
91 | * 2. SKB resize was skipped because all the keys were hw planted but | |
92 | * just before xmit one of the key is deleted and SW encryption kicks | |
93 | * off. | |
94 | * | |
95 | * In both the above case SW encryption will find not enough space for | |
96 | * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c) | |
97 | * | |
98 | * Solution has been explained at | |
99 | * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net | |
100 | */ | |
101 | ||
51f458d9 JB |
102 | assert_key_lock(sdata->local); |
103 | ||
f9dca80b MK |
104 | update_vlan_tailroom_need_count(sdata, 1); |
105 | ||
3bff1865 YAP |
106 | if (!sdata->crypto_tx_tailroom_needed_cnt++) { |
107 | /* | |
108 | * Flush all XMIT packets currently using HW encryption or no | |
109 | * encryption at all if the count transition is from 0 -> 1. | |
110 | */ | |
111 | synchronize_net(); | |
112 | } | |
113 | } | |
114 | ||
f9dca80b MK |
115 | static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata, |
116 | int delta) | |
117 | { | |
51f458d9 JB |
118 | assert_key_lock(sdata->local); |
119 | ||
f9dca80b MK |
120 | WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta); |
121 | ||
122 | update_vlan_tailroom_need_count(sdata, -delta); | |
123 | sdata->crypto_tx_tailroom_needed_cnt -= delta; | |
124 | } | |
125 | ||
3ffc2a90 | 126 | static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key) |
11a843b7 | 127 | { |
dc822b5d | 128 | struct ieee80211_sub_if_data *sdata; |
89c91cae | 129 | struct sta_info *sta; |
fa7e1fbc | 130 | int ret = -EOPNOTSUPP; |
11a843b7 | 131 | |
3b96766f JB |
132 | might_sleep(); |
133 | ||
4619194a JB |
134 | if (key->flags & KEY_FLAG_TAINTED) { |
135 | /* If we get here, it's during resume and the key is | |
136 | * tainted so shouldn't be used/programmed any more. | |
137 | * However, its flags may still indicate that it was | |
138 | * programmed into the device (since we're in resume) | |
139 | * so clear that flag now to avoid trying to remove | |
140 | * it again later. | |
141 | */ | |
142 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; | |
27b3eb9c | 143 | return -EINVAL; |
4619194a | 144 | } |
27b3eb9c | 145 | |
e31b8213 | 146 | if (!key->local->ops->set_key) |
3ffc2a90 | 147 | goto out_unsupported; |
11a843b7 | 148 | |
ad0e2b5a JB |
149 | assert_key_lock(key->local); |
150 | ||
89c91cae | 151 | sta = key->sta; |
dc822b5d | 152 | |
e31b8213 JB |
153 | /* |
154 | * If this is a per-STA GTK, check if it | |
155 | * is supported; if not, return. | |
156 | */ | |
157 | if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) && | |
30686bf7 | 158 | !ieee80211_hw_check(&key->local->hw, SUPPORTS_PER_STA_GTK)) |
e31b8213 JB |
159 | goto out_unsupported; |
160 | ||
89c91cae JB |
161 | if (sta && !sta->uploaded) |
162 | goto out_unsupported; | |
163 | ||
dc822b5d | 164 | sdata = key->sdata; |
18890d4b HS |
165 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { |
166 | /* | |
167 | * The driver doesn't know anything about VLAN interfaces. | |
168 | * Hence, don't send GTKs for VLAN interfaces to the driver. | |
169 | */ | |
170 | if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) | |
171 | goto out_unsupported; | |
18890d4b | 172 | } |
11a843b7 | 173 | |
89c91cae JB |
174 | ret = drv_set_key(key->local, SET_KEY, sdata, |
175 | sta ? &sta->sta : NULL, &key->conf); | |
11a843b7 | 176 | |
e31b8213 | 177 | if (!ret) { |
11a843b7 | 178 | key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; |
3bff1865 | 179 | |
1e359a5d | 180 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
db12847c | 181 | (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) |
f9dca80b | 182 | decrease_tailroom_need_count(sdata, 1); |
3bff1865 | 183 | |
077a9154 AN |
184 | WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && |
185 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)); | |
186 | ||
e31b8213 JB |
187 | return 0; |
188 | } | |
11a843b7 | 189 | |
fa7e1fbc | 190 | if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1) |
bdcbd8e0 | 191 | sdata_err(sdata, |
0fb9a9ec | 192 | "failed to set key (%d, %pM) to hardware (%d)\n", |
89c91cae JB |
193 | key->conf.keyidx, |
194 | sta ? sta->sta.addr : bcast_addr, ret); | |
3ffc2a90 | 195 | |
e31b8213 JB |
196 | out_unsupported: |
197 | switch (key->conf.cipher) { | |
198 | case WLAN_CIPHER_SUITE_WEP40: | |
199 | case WLAN_CIPHER_SUITE_WEP104: | |
200 | case WLAN_CIPHER_SUITE_TKIP: | |
201 | case WLAN_CIPHER_SUITE_CCMP: | |
2b2ba0db | 202 | case WLAN_CIPHER_SUITE_CCMP_256: |
e31b8213 | 203 | case WLAN_CIPHER_SUITE_AES_CMAC: |
56c52da2 | 204 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
8ade538b JM |
205 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
206 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
00b9cfa3 JM |
207 | case WLAN_CIPHER_SUITE_GCMP: |
208 | case WLAN_CIPHER_SUITE_GCMP_256: | |
fa7e1fbc JB |
209 | /* all of these we can do in software - if driver can */ |
210 | if (ret == 1) | |
211 | return 0; | |
30686bf7 | 212 | if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL)) |
fa7e1fbc | 213 | return -EINVAL; |
e31b8213 JB |
214 | return 0; |
215 | default: | |
216 | return -EINVAL; | |
3ffc2a90 | 217 | } |
11a843b7 JB |
218 | } |
219 | ||
220 | static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key) | |
221 | { | |
dc822b5d | 222 | struct ieee80211_sub_if_data *sdata; |
89c91cae | 223 | struct sta_info *sta; |
11a843b7 JB |
224 | int ret; |
225 | ||
3b96766f JB |
226 | might_sleep(); |
227 | ||
db4d1169 | 228 | if (!key || !key->local->ops->set_key) |
11a843b7 JB |
229 | return; |
230 | ||
ad0e2b5a JB |
231 | assert_key_lock(key->local); |
232 | ||
233 | if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) | |
11a843b7 JB |
234 | return; |
235 | ||
89c91cae | 236 | sta = key->sta; |
dc822b5d JB |
237 | sdata = key->sdata; |
238 | ||
1e359a5d | 239 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
db12847c | 240 | (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) |
3bff1865 YAP |
241 | increment_tailroom_need_count(sdata); |
242 | ||
12375ef9 | 243 | ret = drv_set_key(key->local, DISABLE_KEY, sdata, |
89c91cae | 244 | sta ? &sta->sta : NULL, &key->conf); |
11a843b7 JB |
245 | |
246 | if (ret) | |
bdcbd8e0 | 247 | sdata_err(sdata, |
0fb9a9ec | 248 | "failed to remove key (%d, %pM) from hardware (%d)\n", |
89c91cae JB |
249 | key->conf.keyidx, |
250 | sta ? sta->sta.addr : bcast_addr, ret); | |
11a843b7 | 251 | |
3b96766f | 252 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; |
3b96766f JB |
253 | } |
254 | ||
255 | static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, | |
f7e0104c | 256 | int idx, bool uni, bool multi) |
3b96766f JB |
257 | { |
258 | struct ieee80211_key *key = NULL; | |
259 | ||
ad0e2b5a JB |
260 | assert_key_lock(sdata->local); |
261 | ||
3b96766f | 262 | if (idx >= 0 && idx < NUM_DEFAULT_KEYS) |
40b275b6 | 263 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
3b96766f | 264 | |
de5fad81 | 265 | if (uni) { |
f7e0104c | 266 | rcu_assign_pointer(sdata->default_unicast_key, key); |
17c18bf8 | 267 | ieee80211_check_fast_xmit_iface(sdata); |
de5fad81 YD |
268 | drv_set_default_unicast_key(sdata->local, sdata, idx); |
269 | } | |
270 | ||
f7e0104c JB |
271 | if (multi) |
272 | rcu_assign_pointer(sdata->default_multicast_key, key); | |
3b96766f | 273 | |
f7e0104c | 274 | ieee80211_debugfs_key_update_default(sdata); |
3b96766f JB |
275 | } |
276 | ||
f7e0104c JB |
277 | void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx, |
278 | bool uni, bool multi) | |
3b96766f | 279 | { |
ad0e2b5a | 280 | mutex_lock(&sdata->local->key_mtx); |
f7e0104c | 281 | __ieee80211_set_default_key(sdata, idx, uni, multi); |
ad0e2b5a | 282 | mutex_unlock(&sdata->local->key_mtx); |
3b96766f JB |
283 | } |
284 | ||
3cfcf6ac JM |
285 | static void |
286 | __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx) | |
287 | { | |
288 | struct ieee80211_key *key = NULL; | |
289 | ||
ad0e2b5a JB |
290 | assert_key_lock(sdata->local); |
291 | ||
3cfcf6ac JM |
292 | if (idx >= NUM_DEFAULT_KEYS && |
293 | idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
40b275b6 | 294 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
3cfcf6ac JM |
295 | |
296 | rcu_assign_pointer(sdata->default_mgmt_key, key); | |
297 | ||
f7e0104c | 298 | ieee80211_debugfs_key_update_default(sdata); |
3cfcf6ac JM |
299 | } |
300 | ||
301 | void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, | |
302 | int idx) | |
303 | { | |
ad0e2b5a | 304 | mutex_lock(&sdata->local->key_mtx); |
3cfcf6ac | 305 | __ieee80211_set_default_mgmt_key(sdata, idx); |
ad0e2b5a | 306 | mutex_unlock(&sdata->local->key_mtx); |
3cfcf6ac JM |
307 | } |
308 | ||
3b96766f | 309 | |
3b8d9c29 JB |
310 | static void ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, |
311 | struct sta_info *sta, | |
312 | bool pairwise, | |
313 | struct ieee80211_key *old, | |
314 | struct ieee80211_key *new) | |
3b96766f | 315 | { |
f7e0104c JB |
316 | int idx; |
317 | bool defunikey, defmultikey, defmgmtkey; | |
3b96766f | 318 | |
5282c3ba JB |
319 | /* caller must provide at least one old/new */ |
320 | if (WARN_ON(!new && !old)) | |
321 | return; | |
322 | ||
3b96766f | 323 | if (new) |
ef044763 | 324 | list_add_tail_rcu(&new->list, &sdata->key_list); |
3b96766f | 325 | |
2475b1cc | 326 | WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx); |
3b96766f | 327 | |
2475b1cc MS |
328 | if (old) |
329 | idx = old->conf.keyidx; | |
330 | else | |
331 | idx = new->conf.keyidx; | |
3b96766f | 332 | |
2475b1cc MS |
333 | if (sta) { |
334 | if (pairwise) { | |
335 | rcu_assign_pointer(sta->ptk[idx], new); | |
336 | sta->ptk_idx = idx; | |
17c18bf8 | 337 | ieee80211_check_fast_xmit(sta); |
2475b1cc MS |
338 | } else { |
339 | rcu_assign_pointer(sta->gtk[idx], new); | |
2475b1cc | 340 | } |
49ddf8e6 | 341 | ieee80211_check_fast_rx(sta); |
2475b1cc | 342 | } else { |
40b275b6 JB |
343 | defunikey = old && |
344 | old == key_mtx_dereference(sdata->local, | |
345 | sdata->default_unicast_key); | |
346 | defmultikey = old && | |
347 | old == key_mtx_dereference(sdata->local, | |
348 | sdata->default_multicast_key); | |
349 | defmgmtkey = old && | |
350 | old == key_mtx_dereference(sdata->local, | |
351 | sdata->default_mgmt_key); | |
3b96766f | 352 | |
f7e0104c JB |
353 | if (defunikey && !new) |
354 | __ieee80211_set_default_key(sdata, -1, true, false); | |
355 | if (defmultikey && !new) | |
356 | __ieee80211_set_default_key(sdata, -1, false, true); | |
3cfcf6ac JM |
357 | if (defmgmtkey && !new) |
358 | __ieee80211_set_default_mgmt_key(sdata, -1); | |
3b96766f JB |
359 | |
360 | rcu_assign_pointer(sdata->keys[idx], new); | |
f7e0104c JB |
361 | if (defunikey && new) |
362 | __ieee80211_set_default_key(sdata, new->conf.keyidx, | |
363 | true, false); | |
364 | if (defmultikey && new) | |
365 | __ieee80211_set_default_key(sdata, new->conf.keyidx, | |
366 | false, true); | |
3cfcf6ac JM |
367 | if (defmgmtkey && new) |
368 | __ieee80211_set_default_mgmt_key(sdata, | |
369 | new->conf.keyidx); | |
3b96766f JB |
370 | } |
371 | ||
b5c34f66 | 372 | if (old) |
ef044763 | 373 | list_del_rcu(&old->list); |
11a843b7 JB |
374 | } |
375 | ||
2475b1cc MS |
376 | struct ieee80211_key * |
377 | ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, | |
378 | const u8 *key_data, | |
379 | size_t seq_len, const u8 *seq, | |
380 | const struct ieee80211_cipher_scheme *cs) | |
1f5a7e47 JB |
381 | { |
382 | struct ieee80211_key *key; | |
1ac62ba7 | 383 | int i, j, err; |
1f5a7e47 | 384 | |
8c5bb1fa JB |
385 | if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)) |
386 | return ERR_PTR(-EINVAL); | |
11a843b7 JB |
387 | |
388 | key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); | |
1f5a7e47 | 389 | if (!key) |
1ac62ba7 | 390 | return ERR_PTR(-ENOMEM); |
11a843b7 JB |
391 | |
392 | /* | |
393 | * Default to software encryption; we'll later upload the | |
394 | * key to the hardware if possible. | |
395 | */ | |
11a843b7 JB |
396 | key->conf.flags = 0; |
397 | key->flags = 0; | |
398 | ||
97359d12 | 399 | key->conf.cipher = cipher; |
11a843b7 JB |
400 | key->conf.keyidx = idx; |
401 | key->conf.keylen = key_len; | |
97359d12 JB |
402 | switch (cipher) { |
403 | case WLAN_CIPHER_SUITE_WEP40: | |
404 | case WLAN_CIPHER_SUITE_WEP104: | |
4325f6ca JB |
405 | key->conf.iv_len = IEEE80211_WEP_IV_LEN; |
406 | key->conf.icv_len = IEEE80211_WEP_ICV_LEN; | |
76708dee | 407 | break; |
97359d12 | 408 | case WLAN_CIPHER_SUITE_TKIP: |
4325f6ca JB |
409 | key->conf.iv_len = IEEE80211_TKIP_IV_LEN; |
410 | key->conf.icv_len = IEEE80211_TKIP_ICV_LEN; | |
9f26a952 | 411 | if (seq) { |
5a306f58 | 412 | for (i = 0; i < IEEE80211_NUM_TIDS; i++) { |
faa8fdc8 JM |
413 | key->u.tkip.rx[i].iv32 = |
414 | get_unaligned_le32(&seq[2]); | |
415 | key->u.tkip.rx[i].iv16 = | |
416 | get_unaligned_le16(seq); | |
417 | } | |
418 | } | |
523b02ea | 419 | spin_lock_init(&key->u.tkip.txlock); |
76708dee | 420 | break; |
97359d12 | 421 | case WLAN_CIPHER_SUITE_CCMP: |
4325f6ca JB |
422 | key->conf.iv_len = IEEE80211_CCMP_HDR_LEN; |
423 | key->conf.icv_len = IEEE80211_CCMP_MIC_LEN; | |
9f26a952 | 424 | if (seq) { |
5a306f58 | 425 | for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) |
4325f6ca | 426 | for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++) |
faa8fdc8 | 427 | key->u.ccmp.rx_pn[i][j] = |
4325f6ca | 428 | seq[IEEE80211_CCMP_PN_LEN - j - 1]; |
faa8fdc8 | 429 | } |
11a843b7 JB |
430 | /* |
431 | * Initialize AES key state here as an optimization so that | |
432 | * it does not need to be initialized for every packet. | |
433 | */ | |
2b2ba0db JM |
434 | key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt( |
435 | key_data, key_len, IEEE80211_CCMP_MIC_LEN); | |
436 | if (IS_ERR(key->u.ccmp.tfm)) { | |
437 | err = PTR_ERR(key->u.ccmp.tfm); | |
438 | kfree(key); | |
439 | return ERR_PTR(err); | |
440 | } | |
441 | break; | |
442 | case WLAN_CIPHER_SUITE_CCMP_256: | |
443 | key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN; | |
444 | key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN; | |
445 | for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++) | |
446 | for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++) | |
447 | key->u.ccmp.rx_pn[i][j] = | |
448 | seq[IEEE80211_CCMP_256_PN_LEN - j - 1]; | |
449 | /* Initialize AES key state here as an optimization so that | |
450 | * it does not need to be initialized for every packet. | |
451 | */ | |
452 | key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt( | |
453 | key_data, key_len, IEEE80211_CCMP_256_MIC_LEN); | |
1ac62ba7 BH |
454 | if (IS_ERR(key->u.ccmp.tfm)) { |
455 | err = PTR_ERR(key->u.ccmp.tfm); | |
3b96766f | 456 | kfree(key); |
1f951a7f | 457 | return ERR_PTR(err); |
11a843b7 | 458 | } |
60ae0f20 JB |
459 | break; |
460 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
56c52da2 | 461 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
60ae0f20 | 462 | key->conf.iv_len = 0; |
56c52da2 JM |
463 | if (cipher == WLAN_CIPHER_SUITE_AES_CMAC) |
464 | key->conf.icv_len = sizeof(struct ieee80211_mmie); | |
465 | else | |
466 | key->conf.icv_len = sizeof(struct ieee80211_mmie_16); | |
60ae0f20 | 467 | if (seq) |
4325f6ca | 468 | for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++) |
0f927323 | 469 | key->u.aes_cmac.rx_pn[j] = |
4325f6ca | 470 | seq[IEEE80211_CMAC_PN_LEN - j - 1]; |
3cfcf6ac JM |
471 | /* |
472 | * Initialize AES key state here as an optimization so that | |
473 | * it does not need to be initialized for every packet. | |
474 | */ | |
475 | key->u.aes_cmac.tfm = | |
56c52da2 | 476 | ieee80211_aes_cmac_key_setup(key_data, key_len); |
1ac62ba7 BH |
477 | if (IS_ERR(key->u.aes_cmac.tfm)) { |
478 | err = PTR_ERR(key->u.aes_cmac.tfm); | |
3cfcf6ac | 479 | kfree(key); |
1f951a7f | 480 | return ERR_PTR(err); |
3cfcf6ac | 481 | } |
60ae0f20 | 482 | break; |
8ade538b JM |
483 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
484 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
485 | key->conf.iv_len = 0; | |
486 | key->conf.icv_len = sizeof(struct ieee80211_mmie_16); | |
487 | if (seq) | |
488 | for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++) | |
489 | key->u.aes_gmac.rx_pn[j] = | |
490 | seq[IEEE80211_GMAC_PN_LEN - j - 1]; | |
491 | /* Initialize AES key state here as an optimization so that | |
492 | * it does not need to be initialized for every packet. | |
493 | */ | |
494 | key->u.aes_gmac.tfm = | |
495 | ieee80211_aes_gmac_key_setup(key_data, key_len); | |
496 | if (IS_ERR(key->u.aes_gmac.tfm)) { | |
497 | err = PTR_ERR(key->u.aes_gmac.tfm); | |
498 | kfree(key); | |
499 | return ERR_PTR(err); | |
500 | } | |
501 | break; | |
00b9cfa3 JM |
502 | case WLAN_CIPHER_SUITE_GCMP: |
503 | case WLAN_CIPHER_SUITE_GCMP_256: | |
504 | key->conf.iv_len = IEEE80211_GCMP_HDR_LEN; | |
505 | key->conf.icv_len = IEEE80211_GCMP_MIC_LEN; | |
506 | for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++) | |
507 | for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++) | |
508 | key->u.gcmp.rx_pn[i][j] = | |
509 | seq[IEEE80211_GCMP_PN_LEN - j - 1]; | |
510 | /* Initialize AES key state here as an optimization so that | |
511 | * it does not need to be initialized for every packet. | |
512 | */ | |
513 | key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data, | |
514 | key_len); | |
515 | if (IS_ERR(key->u.gcmp.tfm)) { | |
516 | err = PTR_ERR(key->u.gcmp.tfm); | |
517 | kfree(key); | |
518 | return ERR_PTR(err); | |
519 | } | |
520 | break; | |
2475b1cc MS |
521 | default: |
522 | if (cs) { | |
e3a55b53 JB |
523 | if (seq_len && seq_len != cs->pn_len) { |
524 | kfree(key); | |
525 | return ERR_PTR(-EINVAL); | |
526 | } | |
2475b1cc MS |
527 | |
528 | key->conf.iv_len = cs->hdr_len; | |
529 | key->conf.icv_len = cs->mic_len; | |
530 | for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) | |
e3a55b53 | 531 | for (j = 0; j < seq_len; j++) |
2475b1cc | 532 | key->u.gen.rx_pn[i][j] = |
e3a55b53 | 533 | seq[seq_len - j - 1]; |
c7ef38e0 | 534 | key->flags |= KEY_FLAG_CIPHER_SCHEME; |
2475b1cc | 535 | } |
3cfcf6ac | 536 | } |
60ae0f20 JB |
537 | memcpy(key->conf.key, key_data, key_len); |
538 | INIT_LIST_HEAD(&key->list); | |
3cfcf6ac | 539 | |
db4d1169 JB |
540 | return key; |
541 | } | |
11a843b7 | 542 | |
79cf2dfa JB |
543 | static void ieee80211_key_free_common(struct ieee80211_key *key) |
544 | { | |
00b9cfa3 JM |
545 | switch (key->conf.cipher) { |
546 | case WLAN_CIPHER_SUITE_CCMP: | |
2b2ba0db | 547 | case WLAN_CIPHER_SUITE_CCMP_256: |
79cf2dfa | 548 | ieee80211_aes_key_free(key->u.ccmp.tfm); |
00b9cfa3 JM |
549 | break; |
550 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
56c52da2 | 551 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
79cf2dfa | 552 | ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); |
00b9cfa3 | 553 | break; |
8ade538b JM |
554 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
555 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
556 | ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm); | |
557 | break; | |
00b9cfa3 JM |
558 | case WLAN_CIPHER_SUITE_GCMP: |
559 | case WLAN_CIPHER_SUITE_GCMP_256: | |
560 | ieee80211_aes_gcm_key_free(key->u.gcmp.tfm); | |
561 | break; | |
562 | } | |
29c3f9c3 | 563 | kzfree(key); |
79cf2dfa JB |
564 | } |
565 | ||
6d10e46b JB |
566 | static void __ieee80211_key_destroy(struct ieee80211_key *key, |
567 | bool delay_tailroom) | |
ad0e2b5a | 568 | { |
32162a4d JM |
569 | if (key->local) |
570 | ieee80211_key_disable_hw_accel(key); | |
ad0e2b5a | 571 | |
3bff1865 | 572 | if (key->local) { |
8d1f7ecd JB |
573 | struct ieee80211_sub_if_data *sdata = key->sdata; |
574 | ||
32162a4d | 575 | ieee80211_debugfs_key_remove(key); |
8d1f7ecd JB |
576 | |
577 | if (delay_tailroom) { | |
578 | /* see ieee80211_delayed_tailroom_dec */ | |
579 | sdata->crypto_tx_tailroom_pending_dec++; | |
580 | schedule_delayed_work(&sdata->dec_tailroom_needed_wk, | |
581 | HZ/2); | |
582 | } else { | |
f9dca80b | 583 | decrease_tailroom_need_count(sdata, 1); |
8d1f7ecd | 584 | } |
3bff1865 | 585 | } |
ad0e2b5a | 586 | |
79cf2dfa JB |
587 | ieee80211_key_free_common(key); |
588 | } | |
589 | ||
6d10e46b JB |
590 | static void ieee80211_key_destroy(struct ieee80211_key *key, |
591 | bool delay_tailroom) | |
592 | { | |
593 | if (!key) | |
594 | return; | |
595 | ||
596 | /* | |
ef044763 EP |
597 | * Synchronize so the TX path and rcu key iterators |
598 | * can no longer be using this key before we free/remove it. | |
6d10e46b JB |
599 | */ |
600 | synchronize_net(); | |
601 | ||
602 | __ieee80211_key_destroy(key, delay_tailroom); | |
603 | } | |
604 | ||
79cf2dfa JB |
605 | void ieee80211_key_free_unused(struct ieee80211_key *key) |
606 | { | |
607 | WARN_ON(key->sdata || key->local); | |
608 | ieee80211_key_free_common(key); | |
ad0e2b5a JB |
609 | } |
610 | ||
3ffc2a90 JB |
611 | int ieee80211_key_link(struct ieee80211_key *key, |
612 | struct ieee80211_sub_if_data *sdata, | |
613 | struct sta_info *sta) | |
db4d1169 | 614 | { |
27b3eb9c | 615 | struct ieee80211_local *local = sdata->local; |
db4d1169 | 616 | struct ieee80211_key *old_key; |
3ffc2a90 | 617 | int idx, ret; |
67aa030c | 618 | bool pairwise; |
db4d1169 | 619 | |
67aa030c | 620 | pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE; |
db4d1169 JB |
621 | idx = key->conf.keyidx; |
622 | key->local = sdata->local; | |
623 | key->sdata = sdata; | |
624 | key->sta = sta; | |
625 | ||
ad0e2b5a | 626 | mutex_lock(&sdata->local->key_mtx); |
3b96766f | 627 | |
e31b8213 | 628 | if (sta && pairwise) |
2475b1cc | 629 | old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]); |
e31b8213 | 630 | else if (sta) |
40b275b6 | 631 | old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]); |
d4e46a3d | 632 | else |
40b275b6 | 633 | old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
db4d1169 | 634 | |
3bff1865 YAP |
635 | increment_tailroom_need_count(sdata); |
636 | ||
3b8d9c29 JB |
637 | ieee80211_key_replace(sdata, sta, pairwise, old_key, key); |
638 | ieee80211_key_destroy(old_key, true); | |
d4e46a3d | 639 | |
ad0e2b5a | 640 | ieee80211_debugfs_key_add(key); |
db4d1169 | 641 | |
27b3eb9c JB |
642 | if (!local->wowlan) { |
643 | ret = ieee80211_key_enable_hw_accel(key); | |
644 | if (ret) | |
645 | ieee80211_key_free(key, true); | |
646 | } else { | |
647 | ret = 0; | |
648 | } | |
79cf2dfa | 649 | |
ad0e2b5a | 650 | mutex_unlock(&sdata->local->key_mtx); |
3ffc2a90 JB |
651 | |
652 | return ret; | |
1f5a7e47 JB |
653 | } |
654 | ||
3b8d9c29 | 655 | void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom) |
1f5a7e47 | 656 | { |
5c0c3641 JB |
657 | if (!key) |
658 | return; | |
659 | ||
3b96766f JB |
660 | /* |
661 | * Replace key with nothingness if it was ever used. | |
662 | */ | |
3a245766 | 663 | if (key->sdata) |
3b8d9c29 | 664 | ieee80211_key_replace(key->sdata, key->sta, |
e31b8213 JB |
665 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, |
666 | key, NULL); | |
3b8d9c29 | 667 | ieee80211_key_destroy(key, delay_tailroom); |
3b96766f | 668 | } |
d4e46a3d | 669 | |
ad0e2b5a | 670 | void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata) |
3a245766 JB |
671 | { |
672 | struct ieee80211_key *key; | |
f9dca80b | 673 | struct ieee80211_sub_if_data *vlan; |
11a843b7 | 674 | |
3a245766 | 675 | ASSERT_RTNL(); |
11a843b7 | 676 | |
9607e6b6 | 677 | if (WARN_ON(!ieee80211_sdata_running(sdata))) |
3a245766 | 678 | return; |
11a843b7 | 679 | |
ad0e2b5a | 680 | mutex_lock(&sdata->local->key_mtx); |
11a843b7 | 681 | |
f9dca80b MK |
682 | WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || |
683 | sdata->crypto_tx_tailroom_pending_dec); | |
684 | ||
685 | if (sdata->vif.type == NL80211_IFTYPE_AP) { | |
686 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
687 | WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt || | |
688 | vlan->crypto_tx_tailroom_pending_dec); | |
689 | } | |
3bff1865 YAP |
690 | |
691 | list_for_each_entry(key, &sdata->key_list, list) { | |
692 | increment_tailroom_need_count(sdata); | |
ad0e2b5a | 693 | ieee80211_key_enable_hw_accel(key); |
3bff1865 | 694 | } |
3b96766f | 695 | |
ad0e2b5a | 696 | mutex_unlock(&sdata->local->key_mtx); |
11a843b7 JB |
697 | } |
698 | ||
f9dca80b MK |
699 | void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata) |
700 | { | |
701 | struct ieee80211_sub_if_data *vlan; | |
702 | ||
703 | mutex_lock(&sdata->local->key_mtx); | |
704 | ||
705 | sdata->crypto_tx_tailroom_needed_cnt = 0; | |
706 | ||
707 | if (sdata->vif.type == NL80211_IFTYPE_AP) { | |
708 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
709 | vlan->crypto_tx_tailroom_needed_cnt = 0; | |
710 | } | |
711 | ||
712 | mutex_unlock(&sdata->local->key_mtx); | |
713 | } | |
714 | ||
830af02f JB |
715 | void ieee80211_iter_keys(struct ieee80211_hw *hw, |
716 | struct ieee80211_vif *vif, | |
717 | void (*iter)(struct ieee80211_hw *hw, | |
718 | struct ieee80211_vif *vif, | |
719 | struct ieee80211_sta *sta, | |
720 | struct ieee80211_key_conf *key, | |
721 | void *data), | |
722 | void *iter_data) | |
723 | { | |
724 | struct ieee80211_local *local = hw_to_local(hw); | |
27b3eb9c | 725 | struct ieee80211_key *key, *tmp; |
830af02f JB |
726 | struct ieee80211_sub_if_data *sdata; |
727 | ||
728 | ASSERT_RTNL(); | |
729 | ||
730 | mutex_lock(&local->key_mtx); | |
731 | if (vif) { | |
732 | sdata = vif_to_sdata(vif); | |
27b3eb9c | 733 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) |
830af02f JB |
734 | iter(hw, &sdata->vif, |
735 | key->sta ? &key->sta->sta : NULL, | |
736 | &key->conf, iter_data); | |
737 | } else { | |
738 | list_for_each_entry(sdata, &local->interfaces, list) | |
27b3eb9c JB |
739 | list_for_each_entry_safe(key, tmp, |
740 | &sdata->key_list, list) | |
830af02f JB |
741 | iter(hw, &sdata->vif, |
742 | key->sta ? &key->sta->sta : NULL, | |
743 | &key->conf, iter_data); | |
744 | } | |
745 | mutex_unlock(&local->key_mtx); | |
746 | } | |
747 | EXPORT_SYMBOL(ieee80211_iter_keys); | |
748 | ||
ef044763 EP |
749 | static void |
750 | _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw, | |
751 | struct ieee80211_sub_if_data *sdata, | |
752 | void (*iter)(struct ieee80211_hw *hw, | |
753 | struct ieee80211_vif *vif, | |
754 | struct ieee80211_sta *sta, | |
755 | struct ieee80211_key_conf *key, | |
756 | void *data), | |
757 | void *iter_data) | |
758 | { | |
759 | struct ieee80211_key *key; | |
760 | ||
761 | list_for_each_entry_rcu(key, &sdata->key_list, list) { | |
762 | /* skip keys of station in removal process */ | |
763 | if (key->sta && key->sta->removed) | |
764 | continue; | |
765 | if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) | |
766 | continue; | |
767 | ||
768 | iter(hw, &sdata->vif, | |
769 | key->sta ? &key->sta->sta : NULL, | |
770 | &key->conf, iter_data); | |
771 | } | |
772 | } | |
773 | ||
774 | void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw, | |
775 | struct ieee80211_vif *vif, | |
776 | void (*iter)(struct ieee80211_hw *hw, | |
777 | struct ieee80211_vif *vif, | |
778 | struct ieee80211_sta *sta, | |
779 | struct ieee80211_key_conf *key, | |
780 | void *data), | |
781 | void *iter_data) | |
782 | { | |
783 | struct ieee80211_local *local = hw_to_local(hw); | |
784 | struct ieee80211_sub_if_data *sdata; | |
785 | ||
786 | if (vif) { | |
787 | sdata = vif_to_sdata(vif); | |
788 | _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data); | |
789 | } else { | |
790 | list_for_each_entry_rcu(sdata, &local->interfaces, list) | |
791 | _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data); | |
792 | } | |
793 | } | |
794 | EXPORT_SYMBOL(ieee80211_iter_keys_rcu); | |
795 | ||
7907c7d3 JB |
796 | static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata, |
797 | struct list_head *keys) | |
3b96766f JB |
798 | { |
799 | struct ieee80211_key *key, *tmp; | |
3b96766f | 800 | |
f9dca80b MK |
801 | decrease_tailroom_need_count(sdata, |
802 | sdata->crypto_tx_tailroom_pending_dec); | |
8d1f7ecd JB |
803 | sdata->crypto_tx_tailroom_pending_dec = 0; |
804 | ||
3cfcf6ac | 805 | ieee80211_debugfs_key_remove_mgmt_default(sdata); |
3b96766f | 806 | |
6d10e46b JB |
807 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) { |
808 | ieee80211_key_replace(key->sdata, key->sta, | |
809 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
810 | key, NULL); | |
7907c7d3 | 811 | list_add_tail(&key->list, keys); |
6d10e46b | 812 | } |
3b96766f | 813 | |
f7e0104c | 814 | ieee80211_debugfs_key_update_default(sdata); |
7907c7d3 | 815 | } |
f7e0104c | 816 | |
7907c7d3 JB |
817 | void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata, |
818 | bool force_synchronize) | |
819 | { | |
820 | struct ieee80211_local *local = sdata->local; | |
821 | struct ieee80211_sub_if_data *vlan; | |
f9dca80b | 822 | struct ieee80211_sub_if_data *master; |
7907c7d3 JB |
823 | struct ieee80211_key *key, *tmp; |
824 | LIST_HEAD(keys); | |
825 | ||
826 | cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk); | |
827 | ||
828 | mutex_lock(&local->key_mtx); | |
829 | ||
830 | ieee80211_free_keys_iface(sdata, &keys); | |
831 | ||
832 | if (sdata->vif.type == NL80211_IFTYPE_AP) { | |
833 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
834 | ieee80211_free_keys_iface(vlan, &keys); | |
6d10e46b JB |
835 | } |
836 | ||
7907c7d3 JB |
837 | if (!list_empty(&keys) || force_synchronize) |
838 | synchronize_net(); | |
839 | list_for_each_entry_safe(key, tmp, &keys, list) | |
840 | __ieee80211_key_destroy(key, false); | |
841 | ||
f9dca80b MK |
842 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { |
843 | if (sdata->bss) { | |
844 | master = container_of(sdata->bss, | |
845 | struct ieee80211_sub_if_data, | |
846 | u.ap); | |
847 | ||
848 | WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt != | |
849 | master->crypto_tx_tailroom_needed_cnt); | |
850 | } | |
851 | } else { | |
852 | WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || | |
853 | sdata->crypto_tx_tailroom_pending_dec); | |
854 | } | |
855 | ||
7907c7d3 JB |
856 | if (sdata->vif.type == NL80211_IFTYPE_AP) { |
857 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
858 | WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt || | |
859 | vlan->crypto_tx_tailroom_pending_dec); | |
860 | } | |
8d1f7ecd | 861 | |
7907c7d3 | 862 | mutex_unlock(&local->key_mtx); |
11a843b7 | 863 | } |
c68f4b89 | 864 | |
6d10e46b JB |
865 | void ieee80211_free_sta_keys(struct ieee80211_local *local, |
866 | struct sta_info *sta) | |
867 | { | |
c8782078 | 868 | struct ieee80211_key *key; |
6d10e46b JB |
869 | int i; |
870 | ||
871 | mutex_lock(&local->key_mtx); | |
28a9bc68 | 872 | for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) { |
6d10e46b JB |
873 | key = key_mtx_dereference(local, sta->gtk[i]); |
874 | if (!key) | |
875 | continue; | |
876 | ieee80211_key_replace(key->sdata, key->sta, | |
877 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
878 | key, NULL); | |
c8782078 | 879 | __ieee80211_key_destroy(key, true); |
6d10e46b JB |
880 | } |
881 | ||
2475b1cc MS |
882 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { |
883 | key = key_mtx_dereference(local, sta->ptk[i]); | |
884 | if (!key) | |
885 | continue; | |
6d10e46b JB |
886 | ieee80211_key_replace(key->sdata, key->sta, |
887 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
888 | key, NULL); | |
6d10e46b | 889 | __ieee80211_key_destroy(key, true); |
c8782078 | 890 | } |
6d10e46b JB |
891 | |
892 | mutex_unlock(&local->key_mtx); | |
893 | } | |
894 | ||
8d1f7ecd JB |
895 | void ieee80211_delayed_tailroom_dec(struct work_struct *wk) |
896 | { | |
897 | struct ieee80211_sub_if_data *sdata; | |
898 | ||
899 | sdata = container_of(wk, struct ieee80211_sub_if_data, | |
900 | dec_tailroom_needed_wk.work); | |
901 | ||
902 | /* | |
903 | * The reason for the delayed tailroom needed decrementing is to | |
904 | * make roaming faster: during roaming, all keys are first deleted | |
905 | * and then new keys are installed. The first new key causes the | |
906 | * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes | |
907 | * the cost of synchronize_net() (which can be slow). Avoid this | |
908 | * by deferring the crypto_tx_tailroom_needed_cnt decrementing on | |
909 | * key removal for a while, so if we roam the value is larger than | |
910 | * zero and no 0->1 transition happens. | |
911 | * | |
912 | * The cost is that if the AP switching was from an AP with keys | |
913 | * to one without, we still allocate tailroom while it would no | |
914 | * longer be needed. However, in the typical (fast) roaming case | |
915 | * within an ESS this usually won't happen. | |
916 | */ | |
917 | ||
918 | mutex_lock(&sdata->local->key_mtx); | |
f9dca80b MK |
919 | decrease_tailroom_need_count(sdata, |
920 | sdata->crypto_tx_tailroom_pending_dec); | |
8d1f7ecd JB |
921 | sdata->crypto_tx_tailroom_pending_dec = 0; |
922 | mutex_unlock(&sdata->local->key_mtx); | |
923 | } | |
c68f4b89 JB |
924 | |
925 | void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid, | |
926 | const u8 *replay_ctr, gfp_t gfp) | |
927 | { | |
928 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
929 | ||
930 | trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr); | |
931 | ||
932 | cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp); | |
933 | } | |
934 | EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify); | |
3ea542d3 | 935 | |
3ea542d3 JB |
936 | void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf, |
937 | int tid, struct ieee80211_key_seq *seq) | |
938 | { | |
939 | struct ieee80211_key *key; | |
940 | const u8 *pn; | |
941 | ||
942 | key = container_of(keyconf, struct ieee80211_key, conf); | |
943 | ||
944 | switch (key->conf.cipher) { | |
945 | case WLAN_CIPHER_SUITE_TKIP: | |
5a306f58 | 946 | if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) |
3ea542d3 JB |
947 | return; |
948 | seq->tkip.iv32 = key->u.tkip.rx[tid].iv32; | |
949 | seq->tkip.iv16 = key->u.tkip.rx[tid].iv16; | |
950 | break; | |
951 | case WLAN_CIPHER_SUITE_CCMP: | |
2b2ba0db | 952 | case WLAN_CIPHER_SUITE_CCMP_256: |
5a306f58 | 953 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) |
3ea542d3 JB |
954 | return; |
955 | if (tid < 0) | |
5a306f58 | 956 | pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; |
3ea542d3 JB |
957 | else |
958 | pn = key->u.ccmp.rx_pn[tid]; | |
4325f6ca | 959 | memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN); |
3ea542d3 JB |
960 | break; |
961 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
56c52da2 | 962 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
3ea542d3 JB |
963 | if (WARN_ON(tid != 0)) |
964 | return; | |
965 | pn = key->u.aes_cmac.rx_pn; | |
4325f6ca | 966 | memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN); |
3ea542d3 | 967 | break; |
8ade538b JM |
968 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
969 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
970 | if (WARN_ON(tid != 0)) | |
971 | return; | |
972 | pn = key->u.aes_gmac.rx_pn; | |
973 | memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN); | |
974 | break; | |
00b9cfa3 JM |
975 | case WLAN_CIPHER_SUITE_GCMP: |
976 | case WLAN_CIPHER_SUITE_GCMP_256: | |
977 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) | |
978 | return; | |
979 | if (tid < 0) | |
980 | pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; | |
981 | else | |
982 | pn = key->u.gcmp.rx_pn[tid]; | |
983 | memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN); | |
984 | break; | |
3ea542d3 JB |
985 | } |
986 | } | |
987 | EXPORT_SYMBOL(ieee80211_get_key_rx_seq); | |
27b3eb9c | 988 | |
27b3eb9c JB |
989 | void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf, |
990 | int tid, struct ieee80211_key_seq *seq) | |
991 | { | |
992 | struct ieee80211_key *key; | |
993 | u8 *pn; | |
994 | ||
995 | key = container_of(keyconf, struct ieee80211_key, conf); | |
996 | ||
997 | switch (key->conf.cipher) { | |
998 | case WLAN_CIPHER_SUITE_TKIP: | |
999 | if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) | |
1000 | return; | |
1001 | key->u.tkip.rx[tid].iv32 = seq->tkip.iv32; | |
1002 | key->u.tkip.rx[tid].iv16 = seq->tkip.iv16; | |
1003 | break; | |
1004 | case WLAN_CIPHER_SUITE_CCMP: | |
2b2ba0db | 1005 | case WLAN_CIPHER_SUITE_CCMP_256: |
27b3eb9c JB |
1006 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) |
1007 | return; | |
1008 | if (tid < 0) | |
1009 | pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; | |
1010 | else | |
1011 | pn = key->u.ccmp.rx_pn[tid]; | |
1012 | memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN); | |
1013 | break; | |
1014 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
56c52da2 | 1015 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
27b3eb9c JB |
1016 | if (WARN_ON(tid != 0)) |
1017 | return; | |
1018 | pn = key->u.aes_cmac.rx_pn; | |
1019 | memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN); | |
1020 | break; | |
8ade538b JM |
1021 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
1022 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
1023 | if (WARN_ON(tid != 0)) | |
1024 | return; | |
1025 | pn = key->u.aes_gmac.rx_pn; | |
1026 | memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN); | |
1027 | break; | |
00b9cfa3 JM |
1028 | case WLAN_CIPHER_SUITE_GCMP: |
1029 | case WLAN_CIPHER_SUITE_GCMP_256: | |
1030 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) | |
1031 | return; | |
1032 | if (tid < 0) | |
1033 | pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; | |
1034 | else | |
1035 | pn = key->u.gcmp.rx_pn[tid]; | |
1036 | memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN); | |
1037 | break; | |
27b3eb9c JB |
1038 | default: |
1039 | WARN_ON(1); | |
1040 | break; | |
1041 | } | |
1042 | } | |
1043 | EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq); | |
1044 | ||
1045 | void ieee80211_remove_key(struct ieee80211_key_conf *keyconf) | |
1046 | { | |
1047 | struct ieee80211_key *key; | |
1048 | ||
1049 | key = container_of(keyconf, struct ieee80211_key, conf); | |
1050 | ||
1051 | assert_key_lock(key->local); | |
1052 | ||
1053 | /* | |
1054 | * if key was uploaded, we assume the driver will/has remove(d) | |
1055 | * it, so adjust bookkeeping accordingly | |
1056 | */ | |
1057 | if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { | |
1058 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; | |
1059 | ||
1e359a5d | 1060 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
db12847c | 1061 | (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) |
27b3eb9c JB |
1062 | increment_tailroom_need_count(key->sdata); |
1063 | } | |
1064 | ||
1065 | ieee80211_key_free(key, false); | |
1066 | } | |
1067 | EXPORT_SYMBOL_GPL(ieee80211_remove_key); | |
1068 | ||
1069 | struct ieee80211_key_conf * | |
1070 | ieee80211_gtk_rekey_add(struct ieee80211_vif *vif, | |
1071 | struct ieee80211_key_conf *keyconf) | |
1072 | { | |
1073 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
1074 | struct ieee80211_local *local = sdata->local; | |
1075 | struct ieee80211_key *key; | |
1076 | int err; | |
1077 | ||
1078 | if (WARN_ON(!local->wowlan)) | |
1079 | return ERR_PTR(-EINVAL); | |
1080 | ||
1081 | if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) | |
1082 | return ERR_PTR(-EINVAL); | |
1083 | ||
1084 | key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx, | |
1085 | keyconf->keylen, keyconf->key, | |
2475b1cc | 1086 | 0, NULL, NULL); |
27b3eb9c | 1087 | if (IS_ERR(key)) |
c5dc164d | 1088 | return ERR_CAST(key); |
27b3eb9c JB |
1089 | |
1090 | if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED) | |
1091 | key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT; | |
1092 | ||
1093 | err = ieee80211_key_link(key, sdata, NULL); | |
1094 | if (err) | |
1095 | return ERR_PTR(err); | |
1096 | ||
1097 | return &key->conf; | |
1098 | } | |
1099 | EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add); |