Commit | Line | Data |
---|---|---|
1f5a7e47 JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
3b96766f | 5 | * Copyright 2007-2008 Johannes Berg <johannes@sipsolutions.net> |
d98ad83e | 6 | * Copyright 2013-2014 Intel Mobile Communications GmbH |
1f5a7e47 JB |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
11a843b7 JB |
13 | #include <linux/if_ether.h> |
14 | #include <linux/etherdevice.h> | |
15 | #include <linux/list.h> | |
d4e46a3d | 16 | #include <linux/rcupdate.h> |
db4d1169 | 17 | #include <linux/rtnetlink.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
bc3b2d7f | 19 | #include <linux/export.h> |
1f5a7e47 | 20 | #include <net/mac80211.h> |
d26ad377 | 21 | #include <asm/unaligned.h> |
1f5a7e47 | 22 | #include "ieee80211_i.h" |
24487981 | 23 | #include "driver-ops.h" |
1f5a7e47 JB |
24 | #include "debugfs_key.h" |
25 | #include "aes_ccm.h" | |
3cfcf6ac | 26 | #include "aes_cmac.h" |
8ade538b | 27 | #include "aes_gmac.h" |
00b9cfa3 | 28 | #include "aes_gcm.h" |
1f5a7e47 | 29 | |
11a843b7 | 30 | |
dbbea671 JB |
31 | /** |
32 | * DOC: Key handling basics | |
11a843b7 JB |
33 | * |
34 | * Key handling in mac80211 is done based on per-interface (sub_if_data) | |
35 | * keys and per-station keys. Since each station belongs to an interface, | |
36 | * each station key also belongs to that interface. | |
37 | * | |
b5c34f66 JB |
38 | * Hardware acceleration is done on a best-effort basis for algorithms |
39 | * that are implemented in software, for each key the hardware is asked | |
40 | * to enable that key for offloading but if it cannot do that the key is | |
41 | * simply kept for software encryption (unless it is for an algorithm | |
42 | * that isn't implemented in software). | |
43 | * There is currently no way of knowing whether a key is handled in SW | |
44 | * or HW except by looking into debugfs. | |
11a843b7 | 45 | * |
b5c34f66 JB |
46 | * All key management is internally protected by a mutex. Within all |
47 | * other parts of mac80211, key references are, just as STA structure | |
48 | * references, protected by RCU. Note, however, that some things are | |
49 | * unprotected, namely the key->sta dereferences within the hardware | |
50 | * acceleration functions. This means that sta_info_destroy() must | |
51 | * remove the key which waits for an RCU grace period. | |
11a843b7 JB |
52 | */ |
53 | ||
54 | static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; | |
11a843b7 | 55 | |
ad0e2b5a | 56 | static void assert_key_lock(struct ieee80211_local *local) |
3b96766f | 57 | { |
46a5ebaf | 58 | lockdep_assert_held(&local->key_mtx); |
3b96766f JB |
59 | } |
60 | ||
f9dca80b MK |
61 | static void |
62 | update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta) | |
63 | { | |
64 | struct ieee80211_sub_if_data *vlan; | |
65 | ||
66 | if (sdata->vif.type != NL80211_IFTYPE_AP) | |
67 | return; | |
68 | ||
51f458d9 JB |
69 | /* crypto_tx_tailroom_needed_cnt is protected by this */ |
70 | assert_key_lock(sdata->local); | |
f9dca80b | 71 | |
51f458d9 JB |
72 | rcu_read_lock(); |
73 | ||
74 | list_for_each_entry_rcu(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
f9dca80b MK |
75 | vlan->crypto_tx_tailroom_needed_cnt += delta; |
76 | ||
51f458d9 | 77 | rcu_read_unlock(); |
f9dca80b MK |
78 | } |
79 | ||
3bff1865 YAP |
80 | static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata) |
81 | { | |
82 | /* | |
83 | * When this count is zero, SKB resizing for allocating tailroom | |
84 | * for IV or MMIC is skipped. But, this check has created two race | |
85 | * cases in xmit path while transiting from zero count to one: | |
86 | * | |
87 | * 1. SKB resize was skipped because no key was added but just before | |
88 | * the xmit key is added and SW encryption kicks off. | |
89 | * | |
90 | * 2. SKB resize was skipped because all the keys were hw planted but | |
91 | * just before xmit one of the key is deleted and SW encryption kicks | |
92 | * off. | |
93 | * | |
94 | * In both the above case SW encryption will find not enough space for | |
95 | * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c) | |
96 | * | |
97 | * Solution has been explained at | |
98 | * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net | |
99 | */ | |
100 | ||
51f458d9 JB |
101 | assert_key_lock(sdata->local); |
102 | ||
f9dca80b MK |
103 | update_vlan_tailroom_need_count(sdata, 1); |
104 | ||
3bff1865 YAP |
105 | if (!sdata->crypto_tx_tailroom_needed_cnt++) { |
106 | /* | |
107 | * Flush all XMIT packets currently using HW encryption or no | |
108 | * encryption at all if the count transition is from 0 -> 1. | |
109 | */ | |
110 | synchronize_net(); | |
111 | } | |
112 | } | |
113 | ||
f9dca80b MK |
114 | static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata, |
115 | int delta) | |
116 | { | |
51f458d9 JB |
117 | assert_key_lock(sdata->local); |
118 | ||
f9dca80b MK |
119 | WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta); |
120 | ||
121 | update_vlan_tailroom_need_count(sdata, -delta); | |
122 | sdata->crypto_tx_tailroom_needed_cnt -= delta; | |
123 | } | |
124 | ||
3ffc2a90 | 125 | static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key) |
11a843b7 | 126 | { |
dc822b5d | 127 | struct ieee80211_sub_if_data *sdata; |
89c91cae | 128 | struct sta_info *sta; |
fa7e1fbc | 129 | int ret = -EOPNOTSUPP; |
11a843b7 | 130 | |
3b96766f JB |
131 | might_sleep(); |
132 | ||
4619194a JB |
133 | if (key->flags & KEY_FLAG_TAINTED) { |
134 | /* If we get here, it's during resume and the key is | |
135 | * tainted so shouldn't be used/programmed any more. | |
136 | * However, its flags may still indicate that it was | |
137 | * programmed into the device (since we're in resume) | |
138 | * so clear that flag now to avoid trying to remove | |
139 | * it again later. | |
140 | */ | |
141 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; | |
27b3eb9c | 142 | return -EINVAL; |
4619194a | 143 | } |
27b3eb9c | 144 | |
e31b8213 | 145 | if (!key->local->ops->set_key) |
3ffc2a90 | 146 | goto out_unsupported; |
11a843b7 | 147 | |
ad0e2b5a JB |
148 | assert_key_lock(key->local); |
149 | ||
89c91cae | 150 | sta = key->sta; |
dc822b5d | 151 | |
e31b8213 JB |
152 | /* |
153 | * If this is a per-STA GTK, check if it | |
154 | * is supported; if not, return. | |
155 | */ | |
156 | if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) && | |
30686bf7 | 157 | !ieee80211_hw_check(&key->local->hw, SUPPORTS_PER_STA_GTK)) |
e31b8213 JB |
158 | goto out_unsupported; |
159 | ||
89c91cae JB |
160 | if (sta && !sta->uploaded) |
161 | goto out_unsupported; | |
162 | ||
dc822b5d | 163 | sdata = key->sdata; |
18890d4b HS |
164 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { |
165 | /* | |
166 | * The driver doesn't know anything about VLAN interfaces. | |
167 | * Hence, don't send GTKs for VLAN interfaces to the driver. | |
168 | */ | |
169 | if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) | |
170 | goto out_unsupported; | |
18890d4b | 171 | } |
11a843b7 | 172 | |
89c91cae JB |
173 | ret = drv_set_key(key->local, SET_KEY, sdata, |
174 | sta ? &sta->sta : NULL, &key->conf); | |
11a843b7 | 175 | |
e31b8213 | 176 | if (!ret) { |
11a843b7 | 177 | key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; |
3bff1865 | 178 | |
1e359a5d | 179 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
db12847c | 180 | (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) |
f9dca80b | 181 | decrease_tailroom_need_count(sdata, 1); |
3bff1865 | 182 | |
077a9154 AN |
183 | WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && |
184 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)); | |
185 | ||
e31b8213 JB |
186 | return 0; |
187 | } | |
11a843b7 | 188 | |
fa7e1fbc | 189 | if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1) |
bdcbd8e0 | 190 | sdata_err(sdata, |
0fb9a9ec | 191 | "failed to set key (%d, %pM) to hardware (%d)\n", |
89c91cae JB |
192 | key->conf.keyidx, |
193 | sta ? sta->sta.addr : bcast_addr, ret); | |
3ffc2a90 | 194 | |
e31b8213 JB |
195 | out_unsupported: |
196 | switch (key->conf.cipher) { | |
197 | case WLAN_CIPHER_SUITE_WEP40: | |
198 | case WLAN_CIPHER_SUITE_WEP104: | |
199 | case WLAN_CIPHER_SUITE_TKIP: | |
200 | case WLAN_CIPHER_SUITE_CCMP: | |
2b2ba0db | 201 | case WLAN_CIPHER_SUITE_CCMP_256: |
e31b8213 | 202 | case WLAN_CIPHER_SUITE_AES_CMAC: |
56c52da2 | 203 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
8ade538b JM |
204 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
205 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
00b9cfa3 JM |
206 | case WLAN_CIPHER_SUITE_GCMP: |
207 | case WLAN_CIPHER_SUITE_GCMP_256: | |
fa7e1fbc JB |
208 | /* all of these we can do in software - if driver can */ |
209 | if (ret == 1) | |
210 | return 0; | |
30686bf7 | 211 | if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL)) |
fa7e1fbc | 212 | return -EINVAL; |
e31b8213 JB |
213 | return 0; |
214 | default: | |
215 | return -EINVAL; | |
3ffc2a90 | 216 | } |
11a843b7 JB |
217 | } |
218 | ||
219 | static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key) | |
220 | { | |
dc822b5d | 221 | struct ieee80211_sub_if_data *sdata; |
89c91cae | 222 | struct sta_info *sta; |
11a843b7 JB |
223 | int ret; |
224 | ||
3b96766f JB |
225 | might_sleep(); |
226 | ||
db4d1169 | 227 | if (!key || !key->local->ops->set_key) |
11a843b7 JB |
228 | return; |
229 | ||
ad0e2b5a JB |
230 | assert_key_lock(key->local); |
231 | ||
232 | if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) | |
11a843b7 JB |
233 | return; |
234 | ||
89c91cae | 235 | sta = key->sta; |
dc822b5d JB |
236 | sdata = key->sdata; |
237 | ||
1e359a5d | 238 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
db12847c | 239 | (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) |
3bff1865 YAP |
240 | increment_tailroom_need_count(sdata); |
241 | ||
12375ef9 | 242 | ret = drv_set_key(key->local, DISABLE_KEY, sdata, |
89c91cae | 243 | sta ? &sta->sta : NULL, &key->conf); |
11a843b7 JB |
244 | |
245 | if (ret) | |
bdcbd8e0 | 246 | sdata_err(sdata, |
0fb9a9ec | 247 | "failed to remove key (%d, %pM) from hardware (%d)\n", |
89c91cae JB |
248 | key->conf.keyidx, |
249 | sta ? sta->sta.addr : bcast_addr, ret); | |
11a843b7 | 250 | |
3b96766f | 251 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; |
3b96766f JB |
252 | } |
253 | ||
254 | static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, | |
f7e0104c | 255 | int idx, bool uni, bool multi) |
3b96766f JB |
256 | { |
257 | struct ieee80211_key *key = NULL; | |
258 | ||
ad0e2b5a JB |
259 | assert_key_lock(sdata->local); |
260 | ||
3b96766f | 261 | if (idx >= 0 && idx < NUM_DEFAULT_KEYS) |
40b275b6 | 262 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
3b96766f | 263 | |
de5fad81 | 264 | if (uni) { |
f7e0104c | 265 | rcu_assign_pointer(sdata->default_unicast_key, key); |
17c18bf8 | 266 | ieee80211_check_fast_xmit_iface(sdata); |
de5fad81 YD |
267 | drv_set_default_unicast_key(sdata->local, sdata, idx); |
268 | } | |
269 | ||
f7e0104c JB |
270 | if (multi) |
271 | rcu_assign_pointer(sdata->default_multicast_key, key); | |
3b96766f | 272 | |
f7e0104c | 273 | ieee80211_debugfs_key_update_default(sdata); |
3b96766f JB |
274 | } |
275 | ||
f7e0104c JB |
276 | void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx, |
277 | bool uni, bool multi) | |
3b96766f | 278 | { |
ad0e2b5a | 279 | mutex_lock(&sdata->local->key_mtx); |
f7e0104c | 280 | __ieee80211_set_default_key(sdata, idx, uni, multi); |
ad0e2b5a | 281 | mutex_unlock(&sdata->local->key_mtx); |
3b96766f JB |
282 | } |
283 | ||
3cfcf6ac JM |
284 | static void |
285 | __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx) | |
286 | { | |
287 | struct ieee80211_key *key = NULL; | |
288 | ||
ad0e2b5a JB |
289 | assert_key_lock(sdata->local); |
290 | ||
3cfcf6ac JM |
291 | if (idx >= NUM_DEFAULT_KEYS && |
292 | idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
40b275b6 | 293 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
3cfcf6ac JM |
294 | |
295 | rcu_assign_pointer(sdata->default_mgmt_key, key); | |
296 | ||
f7e0104c | 297 | ieee80211_debugfs_key_update_default(sdata); |
3cfcf6ac JM |
298 | } |
299 | ||
300 | void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, | |
301 | int idx) | |
302 | { | |
ad0e2b5a | 303 | mutex_lock(&sdata->local->key_mtx); |
3cfcf6ac | 304 | __ieee80211_set_default_mgmt_key(sdata, idx); |
ad0e2b5a | 305 | mutex_unlock(&sdata->local->key_mtx); |
3cfcf6ac JM |
306 | } |
307 | ||
3b96766f | 308 | |
3b8d9c29 JB |
309 | static void ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, |
310 | struct sta_info *sta, | |
311 | bool pairwise, | |
312 | struct ieee80211_key *old, | |
313 | struct ieee80211_key *new) | |
3b96766f | 314 | { |
f7e0104c JB |
315 | int idx; |
316 | bool defunikey, defmultikey, defmgmtkey; | |
3b96766f | 317 | |
5282c3ba JB |
318 | /* caller must provide at least one old/new */ |
319 | if (WARN_ON(!new && !old)) | |
320 | return; | |
321 | ||
3b96766f | 322 | if (new) |
f850e00f | 323 | list_add_tail(&new->list, &sdata->key_list); |
3b96766f | 324 | |
2475b1cc | 325 | WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx); |
3b96766f | 326 | |
2475b1cc MS |
327 | if (old) |
328 | idx = old->conf.keyidx; | |
329 | else | |
330 | idx = new->conf.keyidx; | |
3b96766f | 331 | |
2475b1cc MS |
332 | if (sta) { |
333 | if (pairwise) { | |
334 | rcu_assign_pointer(sta->ptk[idx], new); | |
335 | sta->ptk_idx = idx; | |
17c18bf8 | 336 | ieee80211_check_fast_xmit(sta); |
2475b1cc MS |
337 | } else { |
338 | rcu_assign_pointer(sta->gtk[idx], new); | |
2475b1cc MS |
339 | } |
340 | } else { | |
40b275b6 JB |
341 | defunikey = old && |
342 | old == key_mtx_dereference(sdata->local, | |
343 | sdata->default_unicast_key); | |
344 | defmultikey = old && | |
345 | old == key_mtx_dereference(sdata->local, | |
346 | sdata->default_multicast_key); | |
347 | defmgmtkey = old && | |
348 | old == key_mtx_dereference(sdata->local, | |
349 | sdata->default_mgmt_key); | |
3b96766f | 350 | |
f7e0104c JB |
351 | if (defunikey && !new) |
352 | __ieee80211_set_default_key(sdata, -1, true, false); | |
353 | if (defmultikey && !new) | |
354 | __ieee80211_set_default_key(sdata, -1, false, true); | |
3cfcf6ac JM |
355 | if (defmgmtkey && !new) |
356 | __ieee80211_set_default_mgmt_key(sdata, -1); | |
3b96766f JB |
357 | |
358 | rcu_assign_pointer(sdata->keys[idx], new); | |
f7e0104c JB |
359 | if (defunikey && new) |
360 | __ieee80211_set_default_key(sdata, new->conf.keyidx, | |
361 | true, false); | |
362 | if (defmultikey && new) | |
363 | __ieee80211_set_default_key(sdata, new->conf.keyidx, | |
364 | false, true); | |
3cfcf6ac JM |
365 | if (defmgmtkey && new) |
366 | __ieee80211_set_default_mgmt_key(sdata, | |
367 | new->conf.keyidx); | |
3b96766f JB |
368 | } |
369 | ||
b5c34f66 JB |
370 | if (old) |
371 | list_del(&old->list); | |
11a843b7 JB |
372 | } |
373 | ||
2475b1cc MS |
374 | struct ieee80211_key * |
375 | ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, | |
376 | const u8 *key_data, | |
377 | size_t seq_len, const u8 *seq, | |
378 | const struct ieee80211_cipher_scheme *cs) | |
1f5a7e47 JB |
379 | { |
380 | struct ieee80211_key *key; | |
1ac62ba7 | 381 | int i, j, err; |
1f5a7e47 | 382 | |
8c5bb1fa JB |
383 | if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)) |
384 | return ERR_PTR(-EINVAL); | |
11a843b7 JB |
385 | |
386 | key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); | |
1f5a7e47 | 387 | if (!key) |
1ac62ba7 | 388 | return ERR_PTR(-ENOMEM); |
11a843b7 JB |
389 | |
390 | /* | |
391 | * Default to software encryption; we'll later upload the | |
392 | * key to the hardware if possible. | |
393 | */ | |
11a843b7 JB |
394 | key->conf.flags = 0; |
395 | key->flags = 0; | |
396 | ||
97359d12 | 397 | key->conf.cipher = cipher; |
11a843b7 JB |
398 | key->conf.keyidx = idx; |
399 | key->conf.keylen = key_len; | |
97359d12 JB |
400 | switch (cipher) { |
401 | case WLAN_CIPHER_SUITE_WEP40: | |
402 | case WLAN_CIPHER_SUITE_WEP104: | |
4325f6ca JB |
403 | key->conf.iv_len = IEEE80211_WEP_IV_LEN; |
404 | key->conf.icv_len = IEEE80211_WEP_ICV_LEN; | |
76708dee | 405 | break; |
97359d12 | 406 | case WLAN_CIPHER_SUITE_TKIP: |
4325f6ca JB |
407 | key->conf.iv_len = IEEE80211_TKIP_IV_LEN; |
408 | key->conf.icv_len = IEEE80211_TKIP_ICV_LEN; | |
9f26a952 | 409 | if (seq) { |
5a306f58 | 410 | for (i = 0; i < IEEE80211_NUM_TIDS; i++) { |
faa8fdc8 JM |
411 | key->u.tkip.rx[i].iv32 = |
412 | get_unaligned_le32(&seq[2]); | |
413 | key->u.tkip.rx[i].iv16 = | |
414 | get_unaligned_le16(seq); | |
415 | } | |
416 | } | |
523b02ea | 417 | spin_lock_init(&key->u.tkip.txlock); |
76708dee | 418 | break; |
97359d12 | 419 | case WLAN_CIPHER_SUITE_CCMP: |
4325f6ca JB |
420 | key->conf.iv_len = IEEE80211_CCMP_HDR_LEN; |
421 | key->conf.icv_len = IEEE80211_CCMP_MIC_LEN; | |
9f26a952 | 422 | if (seq) { |
5a306f58 | 423 | for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) |
4325f6ca | 424 | for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++) |
faa8fdc8 | 425 | key->u.ccmp.rx_pn[i][j] = |
4325f6ca | 426 | seq[IEEE80211_CCMP_PN_LEN - j - 1]; |
faa8fdc8 | 427 | } |
11a843b7 JB |
428 | /* |
429 | * Initialize AES key state here as an optimization so that | |
430 | * it does not need to be initialized for every packet. | |
431 | */ | |
2b2ba0db JM |
432 | key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt( |
433 | key_data, key_len, IEEE80211_CCMP_MIC_LEN); | |
434 | if (IS_ERR(key->u.ccmp.tfm)) { | |
435 | err = PTR_ERR(key->u.ccmp.tfm); | |
436 | kfree(key); | |
437 | return ERR_PTR(err); | |
438 | } | |
439 | break; | |
440 | case WLAN_CIPHER_SUITE_CCMP_256: | |
441 | key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN; | |
442 | key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN; | |
443 | for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++) | |
444 | for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++) | |
445 | key->u.ccmp.rx_pn[i][j] = | |
446 | seq[IEEE80211_CCMP_256_PN_LEN - j - 1]; | |
447 | /* Initialize AES key state here as an optimization so that | |
448 | * it does not need to be initialized for every packet. | |
449 | */ | |
450 | key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt( | |
451 | key_data, key_len, IEEE80211_CCMP_256_MIC_LEN); | |
1ac62ba7 BH |
452 | if (IS_ERR(key->u.ccmp.tfm)) { |
453 | err = PTR_ERR(key->u.ccmp.tfm); | |
3b96766f | 454 | kfree(key); |
1f951a7f | 455 | return ERR_PTR(err); |
11a843b7 | 456 | } |
60ae0f20 JB |
457 | break; |
458 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
56c52da2 | 459 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
60ae0f20 | 460 | key->conf.iv_len = 0; |
56c52da2 JM |
461 | if (cipher == WLAN_CIPHER_SUITE_AES_CMAC) |
462 | key->conf.icv_len = sizeof(struct ieee80211_mmie); | |
463 | else | |
464 | key->conf.icv_len = sizeof(struct ieee80211_mmie_16); | |
60ae0f20 | 465 | if (seq) |
4325f6ca | 466 | for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++) |
0f927323 | 467 | key->u.aes_cmac.rx_pn[j] = |
4325f6ca | 468 | seq[IEEE80211_CMAC_PN_LEN - j - 1]; |
3cfcf6ac JM |
469 | /* |
470 | * Initialize AES key state here as an optimization so that | |
471 | * it does not need to be initialized for every packet. | |
472 | */ | |
473 | key->u.aes_cmac.tfm = | |
56c52da2 | 474 | ieee80211_aes_cmac_key_setup(key_data, key_len); |
1ac62ba7 BH |
475 | if (IS_ERR(key->u.aes_cmac.tfm)) { |
476 | err = PTR_ERR(key->u.aes_cmac.tfm); | |
3cfcf6ac | 477 | kfree(key); |
1f951a7f | 478 | return ERR_PTR(err); |
3cfcf6ac | 479 | } |
60ae0f20 | 480 | break; |
8ade538b JM |
481 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
482 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
483 | key->conf.iv_len = 0; | |
484 | key->conf.icv_len = sizeof(struct ieee80211_mmie_16); | |
485 | if (seq) | |
486 | for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++) | |
487 | key->u.aes_gmac.rx_pn[j] = | |
488 | seq[IEEE80211_GMAC_PN_LEN - j - 1]; | |
489 | /* Initialize AES key state here as an optimization so that | |
490 | * it does not need to be initialized for every packet. | |
491 | */ | |
492 | key->u.aes_gmac.tfm = | |
493 | ieee80211_aes_gmac_key_setup(key_data, key_len); | |
494 | if (IS_ERR(key->u.aes_gmac.tfm)) { | |
495 | err = PTR_ERR(key->u.aes_gmac.tfm); | |
496 | kfree(key); | |
497 | return ERR_PTR(err); | |
498 | } | |
499 | break; | |
00b9cfa3 JM |
500 | case WLAN_CIPHER_SUITE_GCMP: |
501 | case WLAN_CIPHER_SUITE_GCMP_256: | |
502 | key->conf.iv_len = IEEE80211_GCMP_HDR_LEN; | |
503 | key->conf.icv_len = IEEE80211_GCMP_MIC_LEN; | |
504 | for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++) | |
505 | for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++) | |
506 | key->u.gcmp.rx_pn[i][j] = | |
507 | seq[IEEE80211_GCMP_PN_LEN - j - 1]; | |
508 | /* Initialize AES key state here as an optimization so that | |
509 | * it does not need to be initialized for every packet. | |
510 | */ | |
511 | key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data, | |
512 | key_len); | |
513 | if (IS_ERR(key->u.gcmp.tfm)) { | |
514 | err = PTR_ERR(key->u.gcmp.tfm); | |
515 | kfree(key); | |
516 | return ERR_PTR(err); | |
517 | } | |
518 | break; | |
2475b1cc MS |
519 | default: |
520 | if (cs) { | |
e3a55b53 JB |
521 | if (seq_len && seq_len != cs->pn_len) { |
522 | kfree(key); | |
523 | return ERR_PTR(-EINVAL); | |
524 | } | |
2475b1cc MS |
525 | |
526 | key->conf.iv_len = cs->hdr_len; | |
527 | key->conf.icv_len = cs->mic_len; | |
528 | for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) | |
e3a55b53 | 529 | for (j = 0; j < seq_len; j++) |
2475b1cc | 530 | key->u.gen.rx_pn[i][j] = |
e3a55b53 | 531 | seq[seq_len - j - 1]; |
c7ef38e0 | 532 | key->flags |= KEY_FLAG_CIPHER_SCHEME; |
2475b1cc | 533 | } |
3cfcf6ac | 534 | } |
60ae0f20 JB |
535 | memcpy(key->conf.key, key_data, key_len); |
536 | INIT_LIST_HEAD(&key->list); | |
3cfcf6ac | 537 | |
db4d1169 JB |
538 | return key; |
539 | } | |
11a843b7 | 540 | |
79cf2dfa JB |
541 | static void ieee80211_key_free_common(struct ieee80211_key *key) |
542 | { | |
00b9cfa3 JM |
543 | switch (key->conf.cipher) { |
544 | case WLAN_CIPHER_SUITE_CCMP: | |
2b2ba0db | 545 | case WLAN_CIPHER_SUITE_CCMP_256: |
79cf2dfa | 546 | ieee80211_aes_key_free(key->u.ccmp.tfm); |
00b9cfa3 JM |
547 | break; |
548 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
56c52da2 | 549 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
79cf2dfa | 550 | ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); |
00b9cfa3 | 551 | break; |
8ade538b JM |
552 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
553 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
554 | ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm); | |
555 | break; | |
00b9cfa3 JM |
556 | case WLAN_CIPHER_SUITE_GCMP: |
557 | case WLAN_CIPHER_SUITE_GCMP_256: | |
558 | ieee80211_aes_gcm_key_free(key->u.gcmp.tfm); | |
559 | break; | |
560 | } | |
29c3f9c3 | 561 | kzfree(key); |
79cf2dfa JB |
562 | } |
563 | ||
6d10e46b JB |
564 | static void __ieee80211_key_destroy(struct ieee80211_key *key, |
565 | bool delay_tailroom) | |
ad0e2b5a | 566 | { |
32162a4d JM |
567 | if (key->local) |
568 | ieee80211_key_disable_hw_accel(key); | |
ad0e2b5a | 569 | |
3bff1865 | 570 | if (key->local) { |
8d1f7ecd JB |
571 | struct ieee80211_sub_if_data *sdata = key->sdata; |
572 | ||
32162a4d | 573 | ieee80211_debugfs_key_remove(key); |
8d1f7ecd JB |
574 | |
575 | if (delay_tailroom) { | |
576 | /* see ieee80211_delayed_tailroom_dec */ | |
577 | sdata->crypto_tx_tailroom_pending_dec++; | |
578 | schedule_delayed_work(&sdata->dec_tailroom_needed_wk, | |
579 | HZ/2); | |
580 | } else { | |
f9dca80b | 581 | decrease_tailroom_need_count(sdata, 1); |
8d1f7ecd | 582 | } |
3bff1865 | 583 | } |
ad0e2b5a | 584 | |
79cf2dfa JB |
585 | ieee80211_key_free_common(key); |
586 | } | |
587 | ||
6d10e46b JB |
588 | static void ieee80211_key_destroy(struct ieee80211_key *key, |
589 | bool delay_tailroom) | |
590 | { | |
591 | if (!key) | |
592 | return; | |
593 | ||
594 | /* | |
595 | * Synchronize so the TX path can no longer be using | |
596 | * this key before we free/remove it. | |
597 | */ | |
598 | synchronize_net(); | |
599 | ||
600 | __ieee80211_key_destroy(key, delay_tailroom); | |
601 | } | |
602 | ||
79cf2dfa JB |
603 | void ieee80211_key_free_unused(struct ieee80211_key *key) |
604 | { | |
605 | WARN_ON(key->sdata || key->local); | |
606 | ieee80211_key_free_common(key); | |
ad0e2b5a JB |
607 | } |
608 | ||
3ffc2a90 JB |
609 | int ieee80211_key_link(struct ieee80211_key *key, |
610 | struct ieee80211_sub_if_data *sdata, | |
611 | struct sta_info *sta) | |
db4d1169 | 612 | { |
27b3eb9c | 613 | struct ieee80211_local *local = sdata->local; |
db4d1169 | 614 | struct ieee80211_key *old_key; |
3ffc2a90 | 615 | int idx, ret; |
67aa030c | 616 | bool pairwise; |
db4d1169 | 617 | |
67aa030c | 618 | pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE; |
db4d1169 JB |
619 | idx = key->conf.keyidx; |
620 | key->local = sdata->local; | |
621 | key->sdata = sdata; | |
622 | key->sta = sta; | |
623 | ||
ad0e2b5a | 624 | mutex_lock(&sdata->local->key_mtx); |
3b96766f | 625 | |
e31b8213 | 626 | if (sta && pairwise) |
2475b1cc | 627 | old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]); |
e31b8213 | 628 | else if (sta) |
40b275b6 | 629 | old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]); |
d4e46a3d | 630 | else |
40b275b6 | 631 | old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
db4d1169 | 632 | |
3bff1865 YAP |
633 | increment_tailroom_need_count(sdata); |
634 | ||
3b8d9c29 JB |
635 | ieee80211_key_replace(sdata, sta, pairwise, old_key, key); |
636 | ieee80211_key_destroy(old_key, true); | |
d4e46a3d | 637 | |
ad0e2b5a | 638 | ieee80211_debugfs_key_add(key); |
db4d1169 | 639 | |
27b3eb9c JB |
640 | if (!local->wowlan) { |
641 | ret = ieee80211_key_enable_hw_accel(key); | |
642 | if (ret) | |
643 | ieee80211_key_free(key, true); | |
644 | } else { | |
645 | ret = 0; | |
646 | } | |
79cf2dfa | 647 | |
ad0e2b5a | 648 | mutex_unlock(&sdata->local->key_mtx); |
3ffc2a90 JB |
649 | |
650 | return ret; | |
1f5a7e47 JB |
651 | } |
652 | ||
3b8d9c29 | 653 | void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom) |
1f5a7e47 | 654 | { |
5c0c3641 JB |
655 | if (!key) |
656 | return; | |
657 | ||
3b96766f JB |
658 | /* |
659 | * Replace key with nothingness if it was ever used. | |
660 | */ | |
3a245766 | 661 | if (key->sdata) |
3b8d9c29 | 662 | ieee80211_key_replace(key->sdata, key->sta, |
e31b8213 JB |
663 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, |
664 | key, NULL); | |
3b8d9c29 | 665 | ieee80211_key_destroy(key, delay_tailroom); |
3b96766f | 666 | } |
d4e46a3d | 667 | |
ad0e2b5a | 668 | void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata) |
3a245766 JB |
669 | { |
670 | struct ieee80211_key *key; | |
f9dca80b | 671 | struct ieee80211_sub_if_data *vlan; |
11a843b7 | 672 | |
3a245766 | 673 | ASSERT_RTNL(); |
11a843b7 | 674 | |
9607e6b6 | 675 | if (WARN_ON(!ieee80211_sdata_running(sdata))) |
3a245766 | 676 | return; |
11a843b7 | 677 | |
ad0e2b5a | 678 | mutex_lock(&sdata->local->key_mtx); |
11a843b7 | 679 | |
f9dca80b MK |
680 | WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || |
681 | sdata->crypto_tx_tailroom_pending_dec); | |
682 | ||
683 | if (sdata->vif.type == NL80211_IFTYPE_AP) { | |
684 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
685 | WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt || | |
686 | vlan->crypto_tx_tailroom_pending_dec); | |
687 | } | |
3bff1865 YAP |
688 | |
689 | list_for_each_entry(key, &sdata->key_list, list) { | |
690 | increment_tailroom_need_count(sdata); | |
ad0e2b5a | 691 | ieee80211_key_enable_hw_accel(key); |
3bff1865 | 692 | } |
3b96766f | 693 | |
ad0e2b5a | 694 | mutex_unlock(&sdata->local->key_mtx); |
11a843b7 JB |
695 | } |
696 | ||
f9dca80b MK |
697 | void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata) |
698 | { | |
699 | struct ieee80211_sub_if_data *vlan; | |
700 | ||
701 | mutex_lock(&sdata->local->key_mtx); | |
702 | ||
703 | sdata->crypto_tx_tailroom_needed_cnt = 0; | |
704 | ||
705 | if (sdata->vif.type == NL80211_IFTYPE_AP) { | |
706 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
707 | vlan->crypto_tx_tailroom_needed_cnt = 0; | |
708 | } | |
709 | ||
710 | mutex_unlock(&sdata->local->key_mtx); | |
711 | } | |
712 | ||
830af02f JB |
713 | void ieee80211_iter_keys(struct ieee80211_hw *hw, |
714 | struct ieee80211_vif *vif, | |
715 | void (*iter)(struct ieee80211_hw *hw, | |
716 | struct ieee80211_vif *vif, | |
717 | struct ieee80211_sta *sta, | |
718 | struct ieee80211_key_conf *key, | |
719 | void *data), | |
720 | void *iter_data) | |
721 | { | |
722 | struct ieee80211_local *local = hw_to_local(hw); | |
27b3eb9c | 723 | struct ieee80211_key *key, *tmp; |
830af02f JB |
724 | struct ieee80211_sub_if_data *sdata; |
725 | ||
726 | ASSERT_RTNL(); | |
727 | ||
728 | mutex_lock(&local->key_mtx); | |
729 | if (vif) { | |
730 | sdata = vif_to_sdata(vif); | |
27b3eb9c | 731 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) |
830af02f JB |
732 | iter(hw, &sdata->vif, |
733 | key->sta ? &key->sta->sta : NULL, | |
734 | &key->conf, iter_data); | |
735 | } else { | |
736 | list_for_each_entry(sdata, &local->interfaces, list) | |
27b3eb9c JB |
737 | list_for_each_entry_safe(key, tmp, |
738 | &sdata->key_list, list) | |
830af02f JB |
739 | iter(hw, &sdata->vif, |
740 | key->sta ? &key->sta->sta : NULL, | |
741 | &key->conf, iter_data); | |
742 | } | |
743 | mutex_unlock(&local->key_mtx); | |
744 | } | |
745 | EXPORT_SYMBOL(ieee80211_iter_keys); | |
746 | ||
7907c7d3 JB |
747 | static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata, |
748 | struct list_head *keys) | |
3b96766f JB |
749 | { |
750 | struct ieee80211_key *key, *tmp; | |
3b96766f | 751 | |
f9dca80b MK |
752 | decrease_tailroom_need_count(sdata, |
753 | sdata->crypto_tx_tailroom_pending_dec); | |
8d1f7ecd JB |
754 | sdata->crypto_tx_tailroom_pending_dec = 0; |
755 | ||
3cfcf6ac | 756 | ieee80211_debugfs_key_remove_mgmt_default(sdata); |
3b96766f | 757 | |
6d10e46b JB |
758 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) { |
759 | ieee80211_key_replace(key->sdata, key->sta, | |
760 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
761 | key, NULL); | |
7907c7d3 | 762 | list_add_tail(&key->list, keys); |
6d10e46b | 763 | } |
3b96766f | 764 | |
f7e0104c | 765 | ieee80211_debugfs_key_update_default(sdata); |
7907c7d3 | 766 | } |
f7e0104c | 767 | |
7907c7d3 JB |
768 | void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata, |
769 | bool force_synchronize) | |
770 | { | |
771 | struct ieee80211_local *local = sdata->local; | |
772 | struct ieee80211_sub_if_data *vlan; | |
f9dca80b | 773 | struct ieee80211_sub_if_data *master; |
7907c7d3 JB |
774 | struct ieee80211_key *key, *tmp; |
775 | LIST_HEAD(keys); | |
776 | ||
777 | cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk); | |
778 | ||
779 | mutex_lock(&local->key_mtx); | |
780 | ||
781 | ieee80211_free_keys_iface(sdata, &keys); | |
782 | ||
783 | if (sdata->vif.type == NL80211_IFTYPE_AP) { | |
784 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
785 | ieee80211_free_keys_iface(vlan, &keys); | |
6d10e46b JB |
786 | } |
787 | ||
7907c7d3 JB |
788 | if (!list_empty(&keys) || force_synchronize) |
789 | synchronize_net(); | |
790 | list_for_each_entry_safe(key, tmp, &keys, list) | |
791 | __ieee80211_key_destroy(key, false); | |
792 | ||
f9dca80b MK |
793 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { |
794 | if (sdata->bss) { | |
795 | master = container_of(sdata->bss, | |
796 | struct ieee80211_sub_if_data, | |
797 | u.ap); | |
798 | ||
799 | WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt != | |
800 | master->crypto_tx_tailroom_needed_cnt); | |
801 | } | |
802 | } else { | |
803 | WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || | |
804 | sdata->crypto_tx_tailroom_pending_dec); | |
805 | } | |
806 | ||
7907c7d3 JB |
807 | if (sdata->vif.type == NL80211_IFTYPE_AP) { |
808 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
809 | WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt || | |
810 | vlan->crypto_tx_tailroom_pending_dec); | |
811 | } | |
8d1f7ecd | 812 | |
7907c7d3 | 813 | mutex_unlock(&local->key_mtx); |
11a843b7 | 814 | } |
c68f4b89 | 815 | |
6d10e46b JB |
816 | void ieee80211_free_sta_keys(struct ieee80211_local *local, |
817 | struct sta_info *sta) | |
818 | { | |
c8782078 | 819 | struct ieee80211_key *key; |
6d10e46b JB |
820 | int i; |
821 | ||
822 | mutex_lock(&local->key_mtx); | |
28a9bc68 | 823 | for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) { |
6d10e46b JB |
824 | key = key_mtx_dereference(local, sta->gtk[i]); |
825 | if (!key) | |
826 | continue; | |
827 | ieee80211_key_replace(key->sdata, key->sta, | |
828 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
829 | key, NULL); | |
c8782078 | 830 | __ieee80211_key_destroy(key, true); |
6d10e46b JB |
831 | } |
832 | ||
2475b1cc MS |
833 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { |
834 | key = key_mtx_dereference(local, sta->ptk[i]); | |
835 | if (!key) | |
836 | continue; | |
6d10e46b JB |
837 | ieee80211_key_replace(key->sdata, key->sta, |
838 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
839 | key, NULL); | |
6d10e46b | 840 | __ieee80211_key_destroy(key, true); |
c8782078 | 841 | } |
6d10e46b JB |
842 | |
843 | mutex_unlock(&local->key_mtx); | |
844 | } | |
845 | ||
8d1f7ecd JB |
846 | void ieee80211_delayed_tailroom_dec(struct work_struct *wk) |
847 | { | |
848 | struct ieee80211_sub_if_data *sdata; | |
849 | ||
850 | sdata = container_of(wk, struct ieee80211_sub_if_data, | |
851 | dec_tailroom_needed_wk.work); | |
852 | ||
853 | /* | |
854 | * The reason for the delayed tailroom needed decrementing is to | |
855 | * make roaming faster: during roaming, all keys are first deleted | |
856 | * and then new keys are installed. The first new key causes the | |
857 | * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes | |
858 | * the cost of synchronize_net() (which can be slow). Avoid this | |
859 | * by deferring the crypto_tx_tailroom_needed_cnt decrementing on | |
860 | * key removal for a while, so if we roam the value is larger than | |
861 | * zero and no 0->1 transition happens. | |
862 | * | |
863 | * The cost is that if the AP switching was from an AP with keys | |
864 | * to one without, we still allocate tailroom while it would no | |
865 | * longer be needed. However, in the typical (fast) roaming case | |
866 | * within an ESS this usually won't happen. | |
867 | */ | |
868 | ||
869 | mutex_lock(&sdata->local->key_mtx); | |
f9dca80b MK |
870 | decrease_tailroom_need_count(sdata, |
871 | sdata->crypto_tx_tailroom_pending_dec); | |
8d1f7ecd JB |
872 | sdata->crypto_tx_tailroom_pending_dec = 0; |
873 | mutex_unlock(&sdata->local->key_mtx); | |
874 | } | |
c68f4b89 JB |
875 | |
876 | void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid, | |
877 | const u8 *replay_ctr, gfp_t gfp) | |
878 | { | |
879 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
880 | ||
881 | trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr); | |
882 | ||
883 | cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp); | |
884 | } | |
885 | EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify); | |
3ea542d3 JB |
886 | |
887 | void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf, | |
888 | struct ieee80211_key_seq *seq) | |
889 | { | |
890 | struct ieee80211_key *key; | |
891 | u64 pn64; | |
892 | ||
893 | if (WARN_ON(!(keyconf->flags & IEEE80211_KEY_FLAG_GENERATE_IV))) | |
894 | return; | |
895 | ||
896 | key = container_of(keyconf, struct ieee80211_key, conf); | |
897 | ||
898 | switch (key->conf.cipher) { | |
899 | case WLAN_CIPHER_SUITE_TKIP: | |
900 | seq->tkip.iv32 = key->u.tkip.tx.iv32; | |
901 | seq->tkip.iv16 = key->u.tkip.tx.iv16; | |
902 | break; | |
903 | case WLAN_CIPHER_SUITE_CCMP: | |
2b2ba0db | 904 | case WLAN_CIPHER_SUITE_CCMP_256: |
3ea542d3 | 905 | case WLAN_CIPHER_SUITE_AES_CMAC: |
56c52da2 | 906 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
db388a56 JB |
907 | BUILD_BUG_ON(offsetof(typeof(*seq), ccmp) != |
908 | offsetof(typeof(*seq), aes_cmac)); | |
8ade538b JM |
909 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
910 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
db388a56 JB |
911 | BUILD_BUG_ON(offsetof(typeof(*seq), ccmp) != |
912 | offsetof(typeof(*seq), aes_gmac)); | |
913 | case WLAN_CIPHER_SUITE_GCMP: | |
914 | case WLAN_CIPHER_SUITE_GCMP_256: | |
915 | BUILD_BUG_ON(offsetof(typeof(*seq), ccmp) != | |
916 | offsetof(typeof(*seq), gcmp)); | |
917 | pn64 = atomic64_read(&key->conf.tx_pn); | |
8ade538b JM |
918 | seq->ccmp.pn[5] = pn64; |
919 | seq->ccmp.pn[4] = pn64 >> 8; | |
920 | seq->ccmp.pn[3] = pn64 >> 16; | |
921 | seq->ccmp.pn[2] = pn64 >> 24; | |
922 | seq->ccmp.pn[1] = pn64 >> 32; | |
923 | seq->ccmp.pn[0] = pn64 >> 40; | |
924 | break; | |
3ea542d3 JB |
925 | default: |
926 | WARN_ON(1); | |
927 | } | |
928 | } | |
929 | EXPORT_SYMBOL(ieee80211_get_key_tx_seq); | |
930 | ||
931 | void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf, | |
932 | int tid, struct ieee80211_key_seq *seq) | |
933 | { | |
934 | struct ieee80211_key *key; | |
935 | const u8 *pn; | |
936 | ||
937 | key = container_of(keyconf, struct ieee80211_key, conf); | |
938 | ||
939 | switch (key->conf.cipher) { | |
940 | case WLAN_CIPHER_SUITE_TKIP: | |
5a306f58 | 941 | if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) |
3ea542d3 JB |
942 | return; |
943 | seq->tkip.iv32 = key->u.tkip.rx[tid].iv32; | |
944 | seq->tkip.iv16 = key->u.tkip.rx[tid].iv16; | |
945 | break; | |
946 | case WLAN_CIPHER_SUITE_CCMP: | |
2b2ba0db | 947 | case WLAN_CIPHER_SUITE_CCMP_256: |
5a306f58 | 948 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) |
3ea542d3 JB |
949 | return; |
950 | if (tid < 0) | |
5a306f58 | 951 | pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; |
3ea542d3 JB |
952 | else |
953 | pn = key->u.ccmp.rx_pn[tid]; | |
4325f6ca | 954 | memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN); |
3ea542d3 JB |
955 | break; |
956 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
56c52da2 | 957 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
3ea542d3 JB |
958 | if (WARN_ON(tid != 0)) |
959 | return; | |
960 | pn = key->u.aes_cmac.rx_pn; | |
4325f6ca | 961 | memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN); |
3ea542d3 | 962 | break; |
8ade538b JM |
963 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
964 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
965 | if (WARN_ON(tid != 0)) | |
966 | return; | |
967 | pn = key->u.aes_gmac.rx_pn; | |
968 | memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN); | |
969 | break; | |
00b9cfa3 JM |
970 | case WLAN_CIPHER_SUITE_GCMP: |
971 | case WLAN_CIPHER_SUITE_GCMP_256: | |
972 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) | |
973 | return; | |
974 | if (tid < 0) | |
975 | pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; | |
976 | else | |
977 | pn = key->u.gcmp.rx_pn[tid]; | |
978 | memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN); | |
979 | break; | |
3ea542d3 JB |
980 | } |
981 | } | |
982 | EXPORT_SYMBOL(ieee80211_get_key_rx_seq); | |
27b3eb9c JB |
983 | |
984 | void ieee80211_set_key_tx_seq(struct ieee80211_key_conf *keyconf, | |
985 | struct ieee80211_key_seq *seq) | |
986 | { | |
987 | struct ieee80211_key *key; | |
988 | u64 pn64; | |
989 | ||
990 | key = container_of(keyconf, struct ieee80211_key, conf); | |
991 | ||
992 | switch (key->conf.cipher) { | |
993 | case WLAN_CIPHER_SUITE_TKIP: | |
994 | key->u.tkip.tx.iv32 = seq->tkip.iv32; | |
995 | key->u.tkip.tx.iv16 = seq->tkip.iv16; | |
996 | break; | |
997 | case WLAN_CIPHER_SUITE_CCMP: | |
2b2ba0db | 998 | case WLAN_CIPHER_SUITE_CCMP_256: |
27b3eb9c | 999 | case WLAN_CIPHER_SUITE_AES_CMAC: |
56c52da2 | 1000 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
db388a56 JB |
1001 | BUILD_BUG_ON(offsetof(typeof(*seq), ccmp) != |
1002 | offsetof(typeof(*seq), aes_cmac)); | |
8ade538b JM |
1003 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
1004 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
db388a56 JB |
1005 | BUILD_BUG_ON(offsetof(typeof(*seq), ccmp) != |
1006 | offsetof(typeof(*seq), aes_gmac)); | |
00b9cfa3 JM |
1007 | case WLAN_CIPHER_SUITE_GCMP: |
1008 | case WLAN_CIPHER_SUITE_GCMP_256: | |
db388a56 JB |
1009 | BUILD_BUG_ON(offsetof(typeof(*seq), ccmp) != |
1010 | offsetof(typeof(*seq), gcmp)); | |
1011 | pn64 = (u64)seq->ccmp.pn[5] | | |
1012 | ((u64)seq->ccmp.pn[4] << 8) | | |
1013 | ((u64)seq->ccmp.pn[3] << 16) | | |
1014 | ((u64)seq->ccmp.pn[2] << 24) | | |
1015 | ((u64)seq->ccmp.pn[1] << 32) | | |
1016 | ((u64)seq->ccmp.pn[0] << 40); | |
1017 | atomic64_set(&key->conf.tx_pn, pn64); | |
00b9cfa3 | 1018 | break; |
27b3eb9c JB |
1019 | default: |
1020 | WARN_ON(1); | |
1021 | break; | |
1022 | } | |
1023 | } | |
1024 | EXPORT_SYMBOL_GPL(ieee80211_set_key_tx_seq); | |
1025 | ||
1026 | void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf, | |
1027 | int tid, struct ieee80211_key_seq *seq) | |
1028 | { | |
1029 | struct ieee80211_key *key; | |
1030 | u8 *pn; | |
1031 | ||
1032 | key = container_of(keyconf, struct ieee80211_key, conf); | |
1033 | ||
1034 | switch (key->conf.cipher) { | |
1035 | case WLAN_CIPHER_SUITE_TKIP: | |
1036 | if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) | |
1037 | return; | |
1038 | key->u.tkip.rx[tid].iv32 = seq->tkip.iv32; | |
1039 | key->u.tkip.rx[tid].iv16 = seq->tkip.iv16; | |
1040 | break; | |
1041 | case WLAN_CIPHER_SUITE_CCMP: | |
2b2ba0db | 1042 | case WLAN_CIPHER_SUITE_CCMP_256: |
27b3eb9c JB |
1043 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) |
1044 | return; | |
1045 | if (tid < 0) | |
1046 | pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; | |
1047 | else | |
1048 | pn = key->u.ccmp.rx_pn[tid]; | |
1049 | memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN); | |
1050 | break; | |
1051 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
56c52da2 | 1052 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
27b3eb9c JB |
1053 | if (WARN_ON(tid != 0)) |
1054 | return; | |
1055 | pn = key->u.aes_cmac.rx_pn; | |
1056 | memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN); | |
1057 | break; | |
8ade538b JM |
1058 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
1059 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
1060 | if (WARN_ON(tid != 0)) | |
1061 | return; | |
1062 | pn = key->u.aes_gmac.rx_pn; | |
1063 | memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN); | |
1064 | break; | |
00b9cfa3 JM |
1065 | case WLAN_CIPHER_SUITE_GCMP: |
1066 | case WLAN_CIPHER_SUITE_GCMP_256: | |
1067 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) | |
1068 | return; | |
1069 | if (tid < 0) | |
1070 | pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; | |
1071 | else | |
1072 | pn = key->u.gcmp.rx_pn[tid]; | |
1073 | memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN); | |
1074 | break; | |
27b3eb9c JB |
1075 | default: |
1076 | WARN_ON(1); | |
1077 | break; | |
1078 | } | |
1079 | } | |
1080 | EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq); | |
1081 | ||
1082 | void ieee80211_remove_key(struct ieee80211_key_conf *keyconf) | |
1083 | { | |
1084 | struct ieee80211_key *key; | |
1085 | ||
1086 | key = container_of(keyconf, struct ieee80211_key, conf); | |
1087 | ||
1088 | assert_key_lock(key->local); | |
1089 | ||
1090 | /* | |
1091 | * if key was uploaded, we assume the driver will/has remove(d) | |
1092 | * it, so adjust bookkeeping accordingly | |
1093 | */ | |
1094 | if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { | |
1095 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; | |
1096 | ||
1e359a5d | 1097 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
db12847c | 1098 | (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) |
27b3eb9c JB |
1099 | increment_tailroom_need_count(key->sdata); |
1100 | } | |
1101 | ||
1102 | ieee80211_key_free(key, false); | |
1103 | } | |
1104 | EXPORT_SYMBOL_GPL(ieee80211_remove_key); | |
1105 | ||
1106 | struct ieee80211_key_conf * | |
1107 | ieee80211_gtk_rekey_add(struct ieee80211_vif *vif, | |
1108 | struct ieee80211_key_conf *keyconf) | |
1109 | { | |
1110 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
1111 | struct ieee80211_local *local = sdata->local; | |
1112 | struct ieee80211_key *key; | |
1113 | int err; | |
1114 | ||
1115 | if (WARN_ON(!local->wowlan)) | |
1116 | return ERR_PTR(-EINVAL); | |
1117 | ||
1118 | if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) | |
1119 | return ERR_PTR(-EINVAL); | |
1120 | ||
1121 | key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx, | |
1122 | keyconf->keylen, keyconf->key, | |
2475b1cc | 1123 | 0, NULL, NULL); |
27b3eb9c | 1124 | if (IS_ERR(key)) |
c5dc164d | 1125 | return ERR_CAST(key); |
27b3eb9c JB |
1126 | |
1127 | if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED) | |
1128 | key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT; | |
1129 | ||
1130 | err = ieee80211_key_link(key, sdata, NULL); | |
1131 | if (err) | |
1132 | return ERR_PTR(err); | |
1133 | ||
1134 | return &key->conf; | |
1135 | } | |
1136 | EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add); |