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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1f5a7e47 JB |
2 | /* |
3 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
4 | * Copyright 2005-2006, Devicescape Software, Inc. | |
5 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
3b96766f | 6 | * Copyright 2007-2008 Johannes Berg <johannes@sipsolutions.net> |
d98ad83e | 7 | * Copyright 2013-2014 Intel Mobile Communications GmbH |
fdf7cb41 | 8 | * Copyright 2015-2017 Intel Deutschland GmbH |
23a5f0af | 9 | * Copyright 2018-2020, 2022 Intel Corporation |
1f5a7e47 JB |
10 | */ |
11 | ||
11a843b7 JB |
12 | #include <linux/if_ether.h> |
13 | #include <linux/etherdevice.h> | |
14 | #include <linux/list.h> | |
d4e46a3d | 15 | #include <linux/rcupdate.h> |
db4d1169 | 16 | #include <linux/rtnetlink.h> |
5a0e3ad6 | 17 | #include <linux/slab.h> |
bc3b2d7f | 18 | #include <linux/export.h> |
1f5a7e47 | 19 | #include <net/mac80211.h> |
2bdd713b | 20 | #include <crypto/algapi.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 | { |
db3bdcb9 | 127 | struct ieee80211_sub_if_data *sdata = key->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 | */ | |
092c4098 AW |
141 | if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE && |
142 | !(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | | |
143 | IEEE80211_KEY_FLAG_PUT_MIC_SPACE | | |
144 | IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) | |
145 | increment_tailroom_need_count(sdata); | |
146 | ||
4619194a | 147 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; |
27b3eb9c | 148 | return -EINVAL; |
4619194a | 149 | } |
27b3eb9c | 150 | |
e31b8213 | 151 | if (!key->local->ops->set_key) |
3ffc2a90 | 152 | goto out_unsupported; |
11a843b7 | 153 | |
ad0e2b5a JB |
154 | assert_key_lock(key->local); |
155 | ||
89c91cae | 156 | sta = key->sta; |
dc822b5d | 157 | |
e31b8213 JB |
158 | /* |
159 | * If this is a per-STA GTK, check if it | |
160 | * is supported; if not, return. | |
161 | */ | |
162 | if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) && | |
30686bf7 | 163 | !ieee80211_hw_check(&key->local->hw, SUPPORTS_PER_STA_GTK)) |
e31b8213 JB |
164 | goto out_unsupported; |
165 | ||
89c91cae JB |
166 | if (sta && !sta->uploaded) |
167 | goto out_unsupported; | |
168 | ||
18890d4b HS |
169 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { |
170 | /* | |
171 | * The driver doesn't know anything about VLAN interfaces. | |
172 | * Hence, don't send GTKs for VLAN interfaces to the driver. | |
173 | */ | |
78ad2341 AW |
174 | if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) { |
175 | ret = 1; | |
18890d4b | 176 | goto out_unsupported; |
78ad2341 | 177 | } |
18890d4b | 178 | } |
11a843b7 | 179 | |
efe9c2bf JB |
180 | if (key->conf.link_id >= 0 && sdata->vif.active_links && |
181 | !(sdata->vif.active_links & BIT(key->conf.link_id))) | |
182 | return 0; | |
183 | ||
89c91cae JB |
184 | ret = drv_set_key(key->local, SET_KEY, sdata, |
185 | sta ? &sta->sta : NULL, &key->conf); | |
11a843b7 | 186 | |
e31b8213 | 187 | if (!ret) { |
11a843b7 | 188 | key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; |
3bff1865 | 189 | |
092c4098 AW |
190 | if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | |
191 | IEEE80211_KEY_FLAG_PUT_MIC_SPACE | | |
192 | IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) | |
f9dca80b | 193 | decrease_tailroom_need_count(sdata, 1); |
3bff1865 | 194 | |
077a9154 AN |
195 | WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && |
196 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)); | |
197 | ||
9de18d81 DS |
198 | WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) && |
199 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)); | |
200 | ||
e31b8213 JB |
201 | return 0; |
202 | } | |
11a843b7 | 203 | |
fa7e1fbc | 204 | if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1) |
bdcbd8e0 | 205 | sdata_err(sdata, |
0fb9a9ec | 206 | "failed to set key (%d, %pM) to hardware (%d)\n", |
89c91cae JB |
207 | key->conf.keyidx, |
208 | sta ? sta->sta.addr : bcast_addr, ret); | |
3ffc2a90 | 209 | |
e31b8213 JB |
210 | out_unsupported: |
211 | switch (key->conf.cipher) { | |
212 | case WLAN_CIPHER_SUITE_WEP40: | |
213 | case WLAN_CIPHER_SUITE_WEP104: | |
214 | case WLAN_CIPHER_SUITE_TKIP: | |
215 | case WLAN_CIPHER_SUITE_CCMP: | |
2b2ba0db | 216 | case WLAN_CIPHER_SUITE_CCMP_256: |
3c706b97 JC |
217 | case WLAN_CIPHER_SUITE_GCMP: |
218 | case WLAN_CIPHER_SUITE_GCMP_256: | |
e31b8213 | 219 | case WLAN_CIPHER_SUITE_AES_CMAC: |
56c52da2 | 220 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
8ade538b JM |
221 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
222 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
fa7e1fbc JB |
223 | /* all of these we can do in software - if driver can */ |
224 | if (ret == 1) | |
225 | return 0; | |
78ad2341 | 226 | if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL)) |
fa7e1fbc | 227 | return -EINVAL; |
e31b8213 JB |
228 | return 0; |
229 | default: | |
230 | return -EINVAL; | |
3ffc2a90 | 231 | } |
11a843b7 JB |
232 | } |
233 | ||
234 | static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key) | |
235 | { | |
dc822b5d | 236 | struct ieee80211_sub_if_data *sdata; |
89c91cae | 237 | struct sta_info *sta; |
11a843b7 JB |
238 | int ret; |
239 | ||
3b96766f JB |
240 | might_sleep(); |
241 | ||
db4d1169 | 242 | if (!key || !key->local->ops->set_key) |
11a843b7 JB |
243 | return; |
244 | ||
ad0e2b5a JB |
245 | assert_key_lock(key->local); |
246 | ||
247 | if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) | |
11a843b7 JB |
248 | return; |
249 | ||
89c91cae | 250 | sta = key->sta; |
dc822b5d JB |
251 | sdata = key->sdata; |
252 | ||
efe9c2bf JB |
253 | if (key->conf.link_id >= 0 && sdata->vif.active_links && |
254 | !(sdata->vif.active_links & BIT(key->conf.link_id))) | |
255 | return; | |
256 | ||
092c4098 AW |
257 | if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | |
258 | IEEE80211_KEY_FLAG_PUT_MIC_SPACE | | |
259 | IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) | |
3bff1865 YAP |
260 | increment_tailroom_need_count(sdata); |
261 | ||
62872a9b | 262 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; |
12375ef9 | 263 | ret = drv_set_key(key->local, DISABLE_KEY, sdata, |
89c91cae | 264 | sta ? &sta->sta : NULL, &key->conf); |
11a843b7 JB |
265 | |
266 | if (ret) | |
bdcbd8e0 | 267 | sdata_err(sdata, |
0fb9a9ec | 268 | "failed to remove key (%d, %pM) from hardware (%d)\n", |
89c91cae JB |
269 | key->conf.keyidx, |
270 | sta ? sta->sta.addr : bcast_addr, ret); | |
62872a9b | 271 | } |
11a843b7 | 272 | |
a0761a30 | 273 | static int _ieee80211_set_tx_key(struct ieee80211_key *key, bool force) |
96fc6efb AW |
274 | { |
275 | struct sta_info *sta = key->sta; | |
276 | struct ieee80211_local *local = key->local; | |
96fc6efb AW |
277 | |
278 | assert_key_lock(local); | |
279 | ||
a0761a30 JB |
280 | set_sta_flag(sta, WLAN_STA_USES_ENCRYPTION); |
281 | ||
96fc6efb | 282 | sta->ptk_idx = key->conf.keyidx; |
90cc4bd6 | 283 | |
a0761a30 | 284 | if (force || !ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT)) |
dc3998ec | 285 | clear_sta_flag(sta, WLAN_STA_BLOCK_BA); |
96fc6efb AW |
286 | ieee80211_check_fast_xmit(sta); |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
a0761a30 JB |
291 | int ieee80211_set_tx_key(struct ieee80211_key *key) |
292 | { | |
293 | return _ieee80211_set_tx_key(key, false); | |
294 | } | |
295 | ||
90cc4bd6 AW |
296 | static void ieee80211_pairwise_rekey(struct ieee80211_key *old, |
297 | struct ieee80211_key *new) | |
62872a9b | 298 | { |
90cc4bd6 AW |
299 | struct ieee80211_local *local = new->local; |
300 | struct sta_info *sta = new->sta; | |
301 | int i; | |
62872a9b | 302 | |
90cc4bd6 | 303 | assert_key_lock(local); |
62872a9b | 304 | |
90cc4bd6 AW |
305 | if (new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX) { |
306 | /* Extended Key ID key install, initial one or rekey */ | |
307 | ||
dc3998ec AW |
308 | if (sta->ptk_idx != INVALID_PTK_KEYIDX && |
309 | !ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT)) { | |
90cc4bd6 AW |
310 | /* Aggregation Sessions with Extended Key ID must not |
311 | * mix MPDUs with different keyIDs within one A-MPDU. | |
3e47bf1c AW |
312 | * Tear down running Tx aggregation sessions and block |
313 | * new Rx/Tx aggregation requests during rekey to | |
dc3998ec AW |
314 | * ensure there are no A-MPDUs when the driver is not |
315 | * supporting A-MPDU key borders. (Blocking Tx only | |
316 | * would be sufficient but WLAN_STA_BLOCK_BA gets the | |
317 | * job done for the few ms we need it.) | |
90cc4bd6 AW |
318 | */ |
319 | set_sta_flag(sta, WLAN_STA_BLOCK_BA); | |
320 | mutex_lock(&sta->ampdu_mlme.mtx); | |
321 | for (i = 0; i < IEEE80211_NUM_TIDS; i++) | |
322 | ___ieee80211_stop_tx_ba_session(sta, i, | |
323 | AGG_STOP_LOCAL_REQUEST); | |
324 | mutex_unlock(&sta->ampdu_mlme.mtx); | |
325 | } | |
326 | } else if (old) { | |
327 | /* Rekey without Extended Key ID. | |
328 | * Aggregation sessions are OK when running on SW crypto. | |
329 | * A broken remote STA may cause issues not observed with HW | |
330 | * crypto, though. | |
331 | */ | |
332 | if (!(old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) | |
333 | return; | |
62872a9b | 334 | |
90cc4bd6 AW |
335 | /* Stop Tx till we are on the new key */ |
336 | old->flags |= KEY_FLAG_TAINTED; | |
62872a9b | 337 | ieee80211_clear_fast_xmit(sta); |
62872a9b AW |
338 | if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { |
339 | set_sta_flag(sta, WLAN_STA_BLOCK_BA); | |
340 | ieee80211_sta_tear_down_BA_sessions(sta, | |
341 | AGG_STOP_LOCAL_REQUEST); | |
342 | } | |
62872a9b AW |
343 | if (!wiphy_ext_feature_isset(local->hw.wiphy, |
344 | NL80211_EXT_FEATURE_CAN_REPLACE_PTK0)) { | |
345 | pr_warn_ratelimited("Rekeying PTK for STA %pM but driver can't safely do that.", | |
346 | sta->sta.addr); | |
347 | /* Flushing the driver queues *may* help prevent | |
348 | * the clear text leaks and freezes. | |
349 | */ | |
90cc4bd6 | 350 | ieee80211_flush_queues(local, old->sdata, false); |
62872a9b AW |
351 | } |
352 | } | |
3b96766f JB |
353 | } |
354 | ||
ccdde7c7 | 355 | static void __ieee80211_set_default_key(struct ieee80211_link_data *link, |
f7e0104c | 356 | int idx, bool uni, bool multi) |
3b96766f | 357 | { |
ccdde7c7 | 358 | struct ieee80211_sub_if_data *sdata = link->sdata; |
3b96766f JB |
359 | struct ieee80211_key *key = NULL; |
360 | ||
ad0e2b5a JB |
361 | assert_key_lock(sdata->local); |
362 | ||
bfd8403a | 363 | if (idx >= 0 && idx < NUM_DEFAULT_KEYS) { |
40b275b6 | 364 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
bfd8403a | 365 | if (!key) |
ccdde7c7 | 366 | key = key_mtx_dereference(sdata->local, link->gtk[idx]); |
bfd8403a | 367 | } |
3b96766f | 368 | |
de5fad81 | 369 | if (uni) { |
f7e0104c | 370 | rcu_assign_pointer(sdata->default_unicast_key, key); |
17c18bf8 | 371 | ieee80211_check_fast_xmit_iface(sdata); |
ec4efc4a JB |
372 | if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) |
373 | drv_set_default_unicast_key(sdata->local, sdata, idx); | |
de5fad81 YD |
374 | } |
375 | ||
f7e0104c | 376 | if (multi) |
ccdde7c7 | 377 | rcu_assign_pointer(link->default_multicast_key, key); |
3b96766f | 378 | |
f7e0104c | 379 | ieee80211_debugfs_key_update_default(sdata); |
3b96766f JB |
380 | } |
381 | ||
ccdde7c7 | 382 | void ieee80211_set_default_key(struct ieee80211_link_data *link, int idx, |
f7e0104c | 383 | bool uni, bool multi) |
3b96766f | 384 | { |
ccdde7c7 JB |
385 | mutex_lock(&link->sdata->local->key_mtx); |
386 | __ieee80211_set_default_key(link, idx, uni, multi); | |
387 | mutex_unlock(&link->sdata->local->key_mtx); | |
3b96766f JB |
388 | } |
389 | ||
3cfcf6ac | 390 | static void |
ccdde7c7 | 391 | __ieee80211_set_default_mgmt_key(struct ieee80211_link_data *link, int idx) |
3cfcf6ac | 392 | { |
ccdde7c7 | 393 | struct ieee80211_sub_if_data *sdata = link->sdata; |
3cfcf6ac JM |
394 | struct ieee80211_key *key = NULL; |
395 | ||
ad0e2b5a JB |
396 | assert_key_lock(sdata->local); |
397 | ||
3cfcf6ac JM |
398 | if (idx >= NUM_DEFAULT_KEYS && |
399 | idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
ccdde7c7 | 400 | key = key_mtx_dereference(sdata->local, link->gtk[idx]); |
3cfcf6ac | 401 | |
ccdde7c7 | 402 | rcu_assign_pointer(link->default_mgmt_key, key); |
3cfcf6ac | 403 | |
f7e0104c | 404 | ieee80211_debugfs_key_update_default(sdata); |
3cfcf6ac JM |
405 | } |
406 | ||
ccdde7c7 | 407 | void ieee80211_set_default_mgmt_key(struct ieee80211_link_data *link, |
3cfcf6ac JM |
408 | int idx) |
409 | { | |
ccdde7c7 JB |
410 | mutex_lock(&link->sdata->local->key_mtx); |
411 | __ieee80211_set_default_mgmt_key(link, idx); | |
412 | mutex_unlock(&link->sdata->local->key_mtx); | |
3cfcf6ac JM |
413 | } |
414 | ||
e5473e80 | 415 | static void |
ccdde7c7 | 416 | __ieee80211_set_default_beacon_key(struct ieee80211_link_data *link, int idx) |
e5473e80 | 417 | { |
ccdde7c7 | 418 | struct ieee80211_sub_if_data *sdata = link->sdata; |
e5473e80 JM |
419 | struct ieee80211_key *key = NULL; |
420 | ||
421 | assert_key_lock(sdata->local); | |
422 | ||
423 | if (idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS && | |
424 | idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS + | |
425 | NUM_DEFAULT_BEACON_KEYS) | |
ccdde7c7 | 426 | key = key_mtx_dereference(sdata->local, link->gtk[idx]); |
e5473e80 | 427 | |
ccdde7c7 | 428 | rcu_assign_pointer(link->default_beacon_key, key); |
e5473e80 JM |
429 | |
430 | ieee80211_debugfs_key_update_default(sdata); | |
431 | } | |
432 | ||
ccdde7c7 | 433 | void ieee80211_set_default_beacon_key(struct ieee80211_link_data *link, |
e5473e80 JM |
434 | int idx) |
435 | { | |
ccdde7c7 JB |
436 | mutex_lock(&link->sdata->local->key_mtx); |
437 | __ieee80211_set_default_beacon_key(link, idx); | |
438 | mutex_unlock(&link->sdata->local->key_mtx); | |
e5473e80 JM |
439 | } |
440 | ||
62872a9b | 441 | static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, |
ccdde7c7 JB |
442 | struct ieee80211_link_data *link, |
443 | struct sta_info *sta, | |
444 | bool pairwise, | |
445 | struct ieee80211_key *old, | |
446 | struct ieee80211_key *new) | |
3b96766f | 447 | { |
ccdde7c7 JB |
448 | struct link_sta_info *link_sta = sta ? &sta->deflink : NULL; |
449 | int link_id; | |
f7e0104c | 450 | int idx; |
90cc4bd6 | 451 | int ret = 0; |
e5473e80 | 452 | bool defunikey, defmultikey, defmgmtkey, defbeaconkey; |
92ea8df1 | 453 | bool is_wep; |
3b96766f | 454 | |
5282c3ba JB |
455 | /* caller must provide at least one old/new */ |
456 | if (WARN_ON(!new && !old)) | |
62872a9b | 457 | return 0; |
5282c3ba | 458 | |
92ea8df1 JB |
459 | if (new) { |
460 | idx = new->conf.keyidx; | |
92ea8df1 JB |
461 | is_wep = new->conf.cipher == WLAN_CIPHER_SUITE_WEP40 || |
462 | new->conf.cipher == WLAN_CIPHER_SUITE_WEP104; | |
ccdde7c7 | 463 | link_id = new->conf.link_id; |
92ea8df1 JB |
464 | } else { |
465 | idx = old->conf.keyidx; | |
466 | is_wep = old->conf.cipher == WLAN_CIPHER_SUITE_WEP40 || | |
467 | old->conf.cipher == WLAN_CIPHER_SUITE_WEP104; | |
ccdde7c7 JB |
468 | link_id = old->conf.link_id; |
469 | } | |
470 | ||
471 | if (WARN(old && old->conf.link_id != link_id, | |
472 | "old link ID %d doesn't match new link ID %d\n", | |
473 | old->conf.link_id, link_id)) | |
474 | return -EINVAL; | |
475 | ||
476 | if (link_id >= 0) { | |
477 | if (!link) { | |
478 | link = sdata_dereference(sdata->link[link_id], sdata); | |
479 | if (!link) | |
480 | return -ENOLINK; | |
481 | } | |
482 | ||
483 | if (sta) { | |
484 | link_sta = rcu_dereference_protected(sta->link[link_id], | |
485 | lockdep_is_held(&sta->local->sta_mtx)); | |
486 | if (!link_sta) | |
487 | return -ENOLINK; | |
488 | } | |
489 | } else { | |
490 | link = &sdata->deflink; | |
92ea8df1 JB |
491 | } |
492 | ||
493 | if ((is_wep || pairwise) && idx >= NUM_DEFAULT_KEYS) | |
494 | return -EINVAL; | |
3b96766f | 495 | |
2475b1cc | 496 | WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx); |
3b96766f | 497 | |
90cc4bd6 AW |
498 | if (new && sta && pairwise) { |
499 | /* Unicast rekey needs special handling. With Extended Key ID | |
500 | * old is still NULL for the first rekey. | |
501 | */ | |
502 | ieee80211_pairwise_rekey(old, new); | |
503 | } | |
504 | ||
62872a9b | 505 | if (old) { |
90cc4bd6 AW |
506 | if (old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { |
507 | ieee80211_key_disable_hw_accel(old); | |
508 | ||
509 | if (new) | |
510 | ret = ieee80211_key_enable_hw_accel(new); | |
511 | } | |
62872a9b | 512 | } else { |
40b5a0f8 | 513 | if (!new->local->wowlan) |
62872a9b | 514 | ret = ieee80211_key_enable_hw_accel(new); |
62872a9b AW |
515 | } |
516 | ||
517 | if (ret) | |
518 | return ret; | |
3b96766f | 519 | |
ccdde7c7 JB |
520 | if (new) |
521 | list_add_tail_rcu(&new->list, &sdata->key_list); | |
522 | ||
2475b1cc MS |
523 | if (sta) { |
524 | if (pairwise) { | |
525 | rcu_assign_pointer(sta->ptk[idx], new); | |
96fc6efb | 526 | if (new && |
a0761a30 JB |
527 | !(new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX)) |
528 | _ieee80211_set_tx_key(new, true); | |
2475b1cc | 529 | } else { |
ccdde7c7 | 530 | rcu_assign_pointer(link_sta->gtk[idx], new); |
2475b1cc | 531 | } |
96fc6efb AW |
532 | /* Only needed for transition from no key -> key. |
533 | * Still triggers unnecessary when using Extended Key ID | |
534 | * and installing the second key ID the first time. | |
535 | */ | |
536 | if (new && !old) | |
62872a9b | 537 | ieee80211_check_fast_rx(sta); |
2475b1cc | 538 | } else { |
40b275b6 JB |
539 | defunikey = old && |
540 | old == key_mtx_dereference(sdata->local, | |
541 | sdata->default_unicast_key); | |
542 | defmultikey = old && | |
543 | old == key_mtx_dereference(sdata->local, | |
ccdde7c7 | 544 | link->default_multicast_key); |
40b275b6 JB |
545 | defmgmtkey = old && |
546 | old == key_mtx_dereference(sdata->local, | |
ccdde7c7 | 547 | link->default_mgmt_key); |
e5473e80 JM |
548 | defbeaconkey = old && |
549 | old == key_mtx_dereference(sdata->local, | |
ccdde7c7 | 550 | link->default_beacon_key); |
3b96766f | 551 | |
f7e0104c | 552 | if (defunikey && !new) |
ccdde7c7 | 553 | __ieee80211_set_default_key(link, -1, true, false); |
f7e0104c | 554 | if (defmultikey && !new) |
ccdde7c7 | 555 | __ieee80211_set_default_key(link, -1, false, true); |
3cfcf6ac | 556 | if (defmgmtkey && !new) |
ccdde7c7 | 557 | __ieee80211_set_default_mgmt_key(link, -1); |
e5473e80 | 558 | if (defbeaconkey && !new) |
ccdde7c7 | 559 | __ieee80211_set_default_beacon_key(link, -1); |
3b96766f | 560 | |
bfd8403a JB |
561 | if (is_wep || pairwise) |
562 | rcu_assign_pointer(sdata->keys[idx], new); | |
563 | else | |
ccdde7c7 | 564 | rcu_assign_pointer(link->gtk[idx], new); |
bfd8403a | 565 | |
f7e0104c | 566 | if (defunikey && new) |
ccdde7c7 | 567 | __ieee80211_set_default_key(link, new->conf.keyidx, |
f7e0104c JB |
568 | true, false); |
569 | if (defmultikey && new) | |
ccdde7c7 | 570 | __ieee80211_set_default_key(link, new->conf.keyidx, |
f7e0104c | 571 | false, true); |
3cfcf6ac | 572 | if (defmgmtkey && new) |
ccdde7c7 | 573 | __ieee80211_set_default_mgmt_key(link, |
3cfcf6ac | 574 | new->conf.keyidx); |
e5473e80 | 575 | if (defbeaconkey && new) |
ccdde7c7 | 576 | __ieee80211_set_default_beacon_key(link, |
e5473e80 | 577 | new->conf.keyidx); |
3b96766f JB |
578 | } |
579 | ||
b5c34f66 | 580 | if (old) |
ef044763 | 581 | list_del_rcu(&old->list); |
62872a9b AW |
582 | |
583 | return 0; | |
11a843b7 JB |
584 | } |
585 | ||
2475b1cc MS |
586 | struct ieee80211_key * |
587 | ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, | |
588 | const u8 *key_data, | |
23a5f0af | 589 | size_t seq_len, const u8 *seq) |
1f5a7e47 JB |
590 | { |
591 | struct ieee80211_key *key; | |
1ac62ba7 | 592 | int i, j, err; |
1f5a7e47 | 593 | |
e5473e80 JM |
594 | if (WARN_ON(idx < 0 || |
595 | idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS + | |
596 | NUM_DEFAULT_BEACON_KEYS)) | |
8c5bb1fa | 597 | return ERR_PTR(-EINVAL); |
11a843b7 JB |
598 | |
599 | key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); | |
1f5a7e47 | 600 | if (!key) |
1ac62ba7 | 601 | return ERR_PTR(-ENOMEM); |
11a843b7 JB |
602 | |
603 | /* | |
604 | * Default to software encryption; we'll later upload the | |
605 | * key to the hardware if possible. | |
606 | */ | |
11a843b7 JB |
607 | key->conf.flags = 0; |
608 | key->flags = 0; | |
609 | ||
ccdde7c7 | 610 | key->conf.link_id = -1; |
97359d12 | 611 | key->conf.cipher = cipher; |
11a843b7 JB |
612 | key->conf.keyidx = idx; |
613 | key->conf.keylen = key_len; | |
97359d12 JB |
614 | switch (cipher) { |
615 | case WLAN_CIPHER_SUITE_WEP40: | |
616 | case WLAN_CIPHER_SUITE_WEP104: | |
4325f6ca JB |
617 | key->conf.iv_len = IEEE80211_WEP_IV_LEN; |
618 | key->conf.icv_len = IEEE80211_WEP_ICV_LEN; | |
76708dee | 619 | break; |
97359d12 | 620 | case WLAN_CIPHER_SUITE_TKIP: |
4325f6ca JB |
621 | key->conf.iv_len = IEEE80211_TKIP_IV_LEN; |
622 | key->conf.icv_len = IEEE80211_TKIP_ICV_LEN; | |
9f26a952 | 623 | if (seq) { |
5a306f58 | 624 | for (i = 0; i < IEEE80211_NUM_TIDS; i++) { |
faa8fdc8 JM |
625 | key->u.tkip.rx[i].iv32 = |
626 | get_unaligned_le32(&seq[2]); | |
627 | key->u.tkip.rx[i].iv16 = | |
628 | get_unaligned_le16(seq); | |
629 | } | |
630 | } | |
523b02ea | 631 | spin_lock_init(&key->u.tkip.txlock); |
76708dee | 632 | break; |
97359d12 | 633 | case WLAN_CIPHER_SUITE_CCMP: |
4325f6ca JB |
634 | key->conf.iv_len = IEEE80211_CCMP_HDR_LEN; |
635 | key->conf.icv_len = IEEE80211_CCMP_MIC_LEN; | |
9f26a952 | 636 | if (seq) { |
5a306f58 | 637 | for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) |
4325f6ca | 638 | for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++) |
faa8fdc8 | 639 | key->u.ccmp.rx_pn[i][j] = |
4325f6ca | 640 | seq[IEEE80211_CCMP_PN_LEN - j - 1]; |
faa8fdc8 | 641 | } |
11a843b7 JB |
642 | /* |
643 | * Initialize AES key state here as an optimization so that | |
644 | * it does not need to be initialized for every packet. | |
645 | */ | |
2b2ba0db JM |
646 | key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt( |
647 | key_data, key_len, IEEE80211_CCMP_MIC_LEN); | |
648 | if (IS_ERR(key->u.ccmp.tfm)) { | |
649 | err = PTR_ERR(key->u.ccmp.tfm); | |
650 | kfree(key); | |
651 | return ERR_PTR(err); | |
652 | } | |
653 | break; | |
654 | case WLAN_CIPHER_SUITE_CCMP_256: | |
655 | key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN; | |
656 | key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN; | |
657 | for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++) | |
658 | for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++) | |
659 | key->u.ccmp.rx_pn[i][j] = | |
660 | seq[IEEE80211_CCMP_256_PN_LEN - j - 1]; | |
661 | /* Initialize AES key state here as an optimization so that | |
662 | * it does not need to be initialized for every packet. | |
663 | */ | |
664 | key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt( | |
665 | key_data, key_len, IEEE80211_CCMP_256_MIC_LEN); | |
1ac62ba7 BH |
666 | if (IS_ERR(key->u.ccmp.tfm)) { |
667 | err = PTR_ERR(key->u.ccmp.tfm); | |
3b96766f | 668 | kfree(key); |
1f951a7f | 669 | return ERR_PTR(err); |
11a843b7 | 670 | } |
60ae0f20 JB |
671 | break; |
672 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
56c52da2 | 673 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
60ae0f20 | 674 | key->conf.iv_len = 0; |
56c52da2 JM |
675 | if (cipher == WLAN_CIPHER_SUITE_AES_CMAC) |
676 | key->conf.icv_len = sizeof(struct ieee80211_mmie); | |
677 | else | |
678 | key->conf.icv_len = sizeof(struct ieee80211_mmie_16); | |
60ae0f20 | 679 | if (seq) |
4325f6ca | 680 | for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++) |
0f927323 | 681 | key->u.aes_cmac.rx_pn[j] = |
4325f6ca | 682 | seq[IEEE80211_CMAC_PN_LEN - j - 1]; |
3cfcf6ac JM |
683 | /* |
684 | * Initialize AES key state here as an optimization so that | |
685 | * it does not need to be initialized for every packet. | |
686 | */ | |
687 | key->u.aes_cmac.tfm = | |
56c52da2 | 688 | ieee80211_aes_cmac_key_setup(key_data, key_len); |
1ac62ba7 BH |
689 | if (IS_ERR(key->u.aes_cmac.tfm)) { |
690 | err = PTR_ERR(key->u.aes_cmac.tfm); | |
3cfcf6ac | 691 | kfree(key); |
1f951a7f | 692 | return ERR_PTR(err); |
3cfcf6ac | 693 | } |
60ae0f20 | 694 | break; |
8ade538b JM |
695 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
696 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
697 | key->conf.iv_len = 0; | |
698 | key->conf.icv_len = sizeof(struct ieee80211_mmie_16); | |
699 | if (seq) | |
700 | for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++) | |
701 | key->u.aes_gmac.rx_pn[j] = | |
702 | seq[IEEE80211_GMAC_PN_LEN - j - 1]; | |
703 | /* Initialize AES key state here as an optimization so that | |
704 | * it does not need to be initialized for every packet. | |
705 | */ | |
706 | key->u.aes_gmac.tfm = | |
707 | ieee80211_aes_gmac_key_setup(key_data, key_len); | |
708 | if (IS_ERR(key->u.aes_gmac.tfm)) { | |
709 | err = PTR_ERR(key->u.aes_gmac.tfm); | |
710 | kfree(key); | |
711 | return ERR_PTR(err); | |
712 | } | |
713 | break; | |
00b9cfa3 JM |
714 | case WLAN_CIPHER_SUITE_GCMP: |
715 | case WLAN_CIPHER_SUITE_GCMP_256: | |
716 | key->conf.iv_len = IEEE80211_GCMP_HDR_LEN; | |
717 | key->conf.icv_len = IEEE80211_GCMP_MIC_LEN; | |
718 | for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++) | |
719 | for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++) | |
720 | key->u.gcmp.rx_pn[i][j] = | |
721 | seq[IEEE80211_GCMP_PN_LEN - j - 1]; | |
722 | /* Initialize AES key state here as an optimization so that | |
723 | * it does not need to be initialized for every packet. | |
724 | */ | |
725 | key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data, | |
726 | key_len); | |
727 | if (IS_ERR(key->u.gcmp.tfm)) { | |
728 | err = PTR_ERR(key->u.gcmp.tfm); | |
729 | kfree(key); | |
730 | return ERR_PTR(err); | |
731 | } | |
732 | break; | |
3cfcf6ac | 733 | } |
60ae0f20 JB |
734 | memcpy(key->conf.key, key_data, key_len); |
735 | INIT_LIST_HEAD(&key->list); | |
3cfcf6ac | 736 | |
db4d1169 JB |
737 | return key; |
738 | } | |
11a843b7 | 739 | |
79cf2dfa JB |
740 | static void ieee80211_key_free_common(struct ieee80211_key *key) |
741 | { | |
00b9cfa3 JM |
742 | switch (key->conf.cipher) { |
743 | case WLAN_CIPHER_SUITE_CCMP: | |
2b2ba0db | 744 | case WLAN_CIPHER_SUITE_CCMP_256: |
79cf2dfa | 745 | ieee80211_aes_key_free(key->u.ccmp.tfm); |
00b9cfa3 JM |
746 | break; |
747 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
56c52da2 | 748 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
79cf2dfa | 749 | ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); |
00b9cfa3 | 750 | break; |
8ade538b JM |
751 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
752 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
753 | ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm); | |
754 | break; | |
00b9cfa3 JM |
755 | case WLAN_CIPHER_SUITE_GCMP: |
756 | case WLAN_CIPHER_SUITE_GCMP_256: | |
757 | ieee80211_aes_gcm_key_free(key->u.gcmp.tfm); | |
758 | break; | |
759 | } | |
453431a5 | 760 | kfree_sensitive(key); |
79cf2dfa JB |
761 | } |
762 | ||
6d10e46b JB |
763 | static void __ieee80211_key_destroy(struct ieee80211_key *key, |
764 | bool delay_tailroom) | |
ad0e2b5a | 765 | { |
3bff1865 | 766 | if (key->local) { |
8d1f7ecd JB |
767 | struct ieee80211_sub_if_data *sdata = key->sdata; |
768 | ||
32162a4d | 769 | ieee80211_debugfs_key_remove(key); |
8d1f7ecd JB |
770 | |
771 | if (delay_tailroom) { | |
772 | /* see ieee80211_delayed_tailroom_dec */ | |
773 | sdata->crypto_tx_tailroom_pending_dec++; | |
774 | schedule_delayed_work(&sdata->dec_tailroom_needed_wk, | |
775 | HZ/2); | |
776 | } else { | |
f9dca80b | 777 | decrease_tailroom_need_count(sdata, 1); |
8d1f7ecd | 778 | } |
3bff1865 | 779 | } |
ad0e2b5a | 780 | |
79cf2dfa JB |
781 | ieee80211_key_free_common(key); |
782 | } | |
783 | ||
6d10e46b JB |
784 | static void ieee80211_key_destroy(struct ieee80211_key *key, |
785 | bool delay_tailroom) | |
786 | { | |
787 | if (!key) | |
788 | return; | |
789 | ||
790 | /* | |
ef044763 EP |
791 | * Synchronize so the TX path and rcu key iterators |
792 | * can no longer be using this key before we free/remove it. | |
6d10e46b JB |
793 | */ |
794 | synchronize_net(); | |
795 | ||
796 | __ieee80211_key_destroy(key, delay_tailroom); | |
797 | } | |
798 | ||
79cf2dfa JB |
799 | void ieee80211_key_free_unused(struct ieee80211_key *key) |
800 | { | |
801 | WARN_ON(key->sdata || key->local); | |
802 | ieee80211_key_free_common(key); | |
ad0e2b5a JB |
803 | } |
804 | ||
cfbb0d90 JB |
805 | static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata, |
806 | struct ieee80211_key *old, | |
807 | struct ieee80211_key *new) | |
808 | { | |
809 | u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP]; | |
810 | u8 *tk_old, *tk_new; | |
811 | ||
812 | if (!old || new->conf.keylen != old->conf.keylen) | |
813 | return false; | |
814 | ||
815 | tk_old = old->conf.key; | |
816 | tk_new = new->conf.key; | |
817 | ||
818 | /* | |
819 | * In station mode, don't compare the TX MIC key, as it's never used | |
820 | * and offloaded rekeying may not care to send it to the host. This | |
821 | * is the case in iwlwifi, for example. | |
822 | */ | |
823 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
824 | new->conf.cipher == WLAN_CIPHER_SUITE_TKIP && | |
825 | new->conf.keylen == WLAN_KEY_LEN_TKIP && | |
826 | !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) { | |
827 | memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP); | |
828 | memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP); | |
829 | memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8); | |
830 | memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8); | |
831 | tk_old = tkip_old; | |
832 | tk_new = tkip_new; | |
833 | } | |
834 | ||
835 | return !crypto_memneq(tk_old, tk_new, new->conf.keylen); | |
836 | } | |
837 | ||
3ffc2a90 | 838 | int ieee80211_key_link(struct ieee80211_key *key, |
ccdde7c7 | 839 | struct ieee80211_link_data *link, |
3ffc2a90 | 840 | struct sta_info *sta) |
db4d1169 | 841 | { |
ccdde7c7 | 842 | struct ieee80211_sub_if_data *sdata = link->sdata; |
94034c40 | 843 | static atomic_t key_color = ATOMIC_INIT(0); |
bfd8403a | 844 | struct ieee80211_key *old_key = NULL; |
133bf90d MP |
845 | int idx = key->conf.keyidx; |
846 | bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE; | |
847 | /* | |
848 | * We want to delay tailroom updates only for station - in that | |
849 | * case it helps roaming speed, but in other cases it hurts and | |
850 | * can cause warnings to appear. | |
851 | */ | |
852 | bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION; | |
96fc6efb | 853 | int ret = -EOPNOTSUPP; |
db4d1169 | 854 | |
ad0e2b5a | 855 | mutex_lock(&sdata->local->key_mtx); |
3b96766f | 856 | |
96fc6efb AW |
857 | if (sta && pairwise) { |
858 | struct ieee80211_key *alt_key; | |
859 | ||
2475b1cc | 860 | old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]); |
96fc6efb AW |
861 | alt_key = key_mtx_dereference(sdata->local, sta->ptk[idx ^ 1]); |
862 | ||
863 | /* The rekey code assumes that the old and new key are using | |
864 | * the same cipher. Enforce the assumption for pairwise keys. | |
865 | */ | |
1c955973 JB |
866 | if ((alt_key && alt_key->conf.cipher != key->conf.cipher) || |
867 | (old_key && old_key->conf.cipher != key->conf.cipher)) | |
96fc6efb AW |
868 | goto out; |
869 | } else if (sta) { | |
ccdde7c7 JB |
870 | struct link_sta_info *link_sta = &sta->deflink; |
871 | int link_id = key->conf.link_id; | |
872 | ||
873 | if (link_id >= 0) { | |
874 | link_sta = rcu_dereference_protected(sta->link[link_id], | |
875 | lockdep_is_held(&sta->local->sta_mtx)); | |
7c13844c SK |
876 | if (!link_sta) { |
877 | ret = -ENOLINK; | |
878 | goto out; | |
879 | } | |
ccdde7c7 JB |
880 | } |
881 | ||
882 | old_key = key_mtx_dereference(sdata->local, link_sta->gtk[idx]); | |
96fc6efb | 883 | } else { |
bfd8403a JB |
884 | if (idx < NUM_DEFAULT_KEYS) |
885 | old_key = key_mtx_dereference(sdata->local, | |
886 | sdata->keys[idx]); | |
887 | if (!old_key) | |
888 | old_key = key_mtx_dereference(sdata->local, | |
ccdde7c7 | 889 | link->gtk[idx]); |
96fc6efb AW |
890 | } |
891 | ||
892 | /* Non-pairwise keys must also not switch the cipher on rekey */ | |
893 | if (!pairwise) { | |
753a9a72 | 894 | if (old_key && old_key->conf.cipher != key->conf.cipher) |
96fc6efb AW |
895 | goto out; |
896 | } | |
db4d1169 | 897 | |
fdf7cb41 JB |
898 | /* |
899 | * Silently accept key re-installation without really installing the | |
900 | * new version of the key to avoid nonce reuse or replay issues. | |
901 | */ | |
cfbb0d90 | 902 | if (ieee80211_key_identical(sdata, old_key, key)) { |
fdf7cb41 JB |
903 | ieee80211_key_free_unused(key); |
904 | ret = 0; | |
905 | goto out; | |
906 | } | |
907 | ||
908 | key->local = sdata->local; | |
909 | key->sdata = sdata; | |
910 | key->sta = sta; | |
911 | ||
94034c40 MV |
912 | /* |
913 | * Assign a unique ID to every key so we can easily prevent mixed | |
914 | * key and fragment cache attacks. | |
915 | */ | |
916 | key->color = atomic_inc_return(&key_color); | |
917 | ||
3bff1865 YAP |
918 | increment_tailroom_need_count(sdata); |
919 | ||
ccdde7c7 | 920 | ret = ieee80211_key_replace(sdata, link, sta, pairwise, old_key, key); |
db4d1169 | 921 | |
62872a9b AW |
922 | if (!ret) { |
923 | ieee80211_debugfs_key_add(key); | |
924 | ieee80211_key_destroy(old_key, delay_tailroom); | |
27b3eb9c | 925 | } else { |
62872a9b | 926 | ieee80211_key_free(key, delay_tailroom); |
27b3eb9c | 927 | } |
79cf2dfa | 928 | |
fdf7cb41 | 929 | out: |
ad0e2b5a | 930 | mutex_unlock(&sdata->local->key_mtx); |
3ffc2a90 JB |
931 | |
932 | return ret; | |
1f5a7e47 JB |
933 | } |
934 | ||
3b8d9c29 | 935 | void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom) |
1f5a7e47 | 936 | { |
5c0c3641 JB |
937 | if (!key) |
938 | return; | |
939 | ||
3b96766f JB |
940 | /* |
941 | * Replace key with nothingness if it was ever used. | |
942 | */ | |
3a245766 | 943 | if (key->sdata) |
ccdde7c7 JB |
944 | ieee80211_key_replace(key->sdata, NULL, key->sta, |
945 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
946 | key, NULL); | |
3b8d9c29 | 947 | ieee80211_key_destroy(key, delay_tailroom); |
3b96766f | 948 | } |
d4e46a3d | 949 | |
624ff4b2 | 950 | void ieee80211_reenable_keys(struct ieee80211_sub_if_data *sdata) |
3a245766 JB |
951 | { |
952 | struct ieee80211_key *key; | |
f9dca80b | 953 | struct ieee80211_sub_if_data *vlan; |
11a843b7 | 954 | |
a05829a7 | 955 | lockdep_assert_wiphy(sdata->local->hw.wiphy); |
11a843b7 | 956 | |
f9dca80b MK |
957 | mutex_lock(&sdata->local->key_mtx); |
958 | ||
959 | sdata->crypto_tx_tailroom_needed_cnt = 0; | |
624ff4b2 | 960 | sdata->crypto_tx_tailroom_pending_dec = 0; |
f9dca80b MK |
961 | |
962 | if (sdata->vif.type == NL80211_IFTYPE_AP) { | |
624ff4b2 | 963 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) { |
f9dca80b | 964 | vlan->crypto_tx_tailroom_needed_cnt = 0; |
624ff4b2 LC |
965 | vlan->crypto_tx_tailroom_pending_dec = 0; |
966 | } | |
967 | } | |
968 | ||
969 | if (ieee80211_sdata_running(sdata)) { | |
970 | list_for_each_entry(key, &sdata->key_list, list) { | |
971 | increment_tailroom_need_count(sdata); | |
972 | ieee80211_key_enable_hw_accel(key); | |
973 | } | |
f9dca80b MK |
974 | } |
975 | ||
976 | mutex_unlock(&sdata->local->key_mtx); | |
977 | } | |
978 | ||
830af02f JB |
979 | void ieee80211_iter_keys(struct ieee80211_hw *hw, |
980 | struct ieee80211_vif *vif, | |
981 | void (*iter)(struct ieee80211_hw *hw, | |
982 | struct ieee80211_vif *vif, | |
983 | struct ieee80211_sta *sta, | |
984 | struct ieee80211_key_conf *key, | |
985 | void *data), | |
986 | void *iter_data) | |
987 | { | |
988 | struct ieee80211_local *local = hw_to_local(hw); | |
27b3eb9c | 989 | struct ieee80211_key *key, *tmp; |
830af02f JB |
990 | struct ieee80211_sub_if_data *sdata; |
991 | ||
a05829a7 | 992 | lockdep_assert_wiphy(hw->wiphy); |
830af02f JB |
993 | |
994 | mutex_lock(&local->key_mtx); | |
995 | if (vif) { | |
996 | sdata = vif_to_sdata(vif); | |
27b3eb9c | 997 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) |
830af02f JB |
998 | iter(hw, &sdata->vif, |
999 | key->sta ? &key->sta->sta : NULL, | |
1000 | &key->conf, iter_data); | |
1001 | } else { | |
1002 | list_for_each_entry(sdata, &local->interfaces, list) | |
27b3eb9c JB |
1003 | list_for_each_entry_safe(key, tmp, |
1004 | &sdata->key_list, list) | |
830af02f JB |
1005 | iter(hw, &sdata->vif, |
1006 | key->sta ? &key->sta->sta : NULL, | |
1007 | &key->conf, iter_data); | |
1008 | } | |
1009 | mutex_unlock(&local->key_mtx); | |
1010 | } | |
1011 | EXPORT_SYMBOL(ieee80211_iter_keys); | |
1012 | ||
ef044763 EP |
1013 | static void |
1014 | _ieee80211_iter_keys_rcu(struct ieee80211_hw *hw, | |
1015 | struct ieee80211_sub_if_data *sdata, | |
1016 | void (*iter)(struct ieee80211_hw *hw, | |
1017 | struct ieee80211_vif *vif, | |
1018 | struct ieee80211_sta *sta, | |
1019 | struct ieee80211_key_conf *key, | |
1020 | void *data), | |
1021 | void *iter_data) | |
1022 | { | |
1023 | struct ieee80211_key *key; | |
1024 | ||
1025 | list_for_each_entry_rcu(key, &sdata->key_list, list) { | |
1026 | /* skip keys of station in removal process */ | |
1027 | if (key->sta && key->sta->removed) | |
1028 | continue; | |
1029 | if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) | |
1030 | continue; | |
1031 | ||
1032 | iter(hw, &sdata->vif, | |
1033 | key->sta ? &key->sta->sta : NULL, | |
1034 | &key->conf, iter_data); | |
1035 | } | |
1036 | } | |
1037 | ||
1038 | void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw, | |
1039 | struct ieee80211_vif *vif, | |
1040 | void (*iter)(struct ieee80211_hw *hw, | |
1041 | struct ieee80211_vif *vif, | |
1042 | struct ieee80211_sta *sta, | |
1043 | struct ieee80211_key_conf *key, | |
1044 | void *data), | |
1045 | void *iter_data) | |
1046 | { | |
1047 | struct ieee80211_local *local = hw_to_local(hw); | |
1048 | struct ieee80211_sub_if_data *sdata; | |
1049 | ||
1050 | if (vif) { | |
1051 | sdata = vif_to_sdata(vif); | |
1052 | _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data); | |
1053 | } else { | |
1054 | list_for_each_entry_rcu(sdata, &local->interfaces, list) | |
1055 | _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data); | |
1056 | } | |
1057 | } | |
1058 | EXPORT_SYMBOL(ieee80211_iter_keys_rcu); | |
1059 | ||
7907c7d3 JB |
1060 | static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata, |
1061 | struct list_head *keys) | |
3b96766f JB |
1062 | { |
1063 | struct ieee80211_key *key, *tmp; | |
3b96766f | 1064 | |
f9dca80b MK |
1065 | decrease_tailroom_need_count(sdata, |
1066 | sdata->crypto_tx_tailroom_pending_dec); | |
8d1f7ecd JB |
1067 | sdata->crypto_tx_tailroom_pending_dec = 0; |
1068 | ||
3cfcf6ac | 1069 | ieee80211_debugfs_key_remove_mgmt_default(sdata); |
e5473e80 | 1070 | ieee80211_debugfs_key_remove_beacon_default(sdata); |
3b96766f | 1071 | |
6d10e46b | 1072 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) { |
ccdde7c7 JB |
1073 | ieee80211_key_replace(key->sdata, NULL, key->sta, |
1074 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
1075 | key, NULL); | |
7907c7d3 | 1076 | list_add_tail(&key->list, keys); |
6d10e46b | 1077 | } |
3b96766f | 1078 | |
f7e0104c | 1079 | ieee80211_debugfs_key_update_default(sdata); |
7907c7d3 | 1080 | } |
f7e0104c | 1081 | |
ccdde7c7 JB |
1082 | void ieee80211_remove_link_keys(struct ieee80211_link_data *link, |
1083 | struct list_head *keys) | |
1084 | { | |
1085 | struct ieee80211_sub_if_data *sdata = link->sdata; | |
1086 | struct ieee80211_local *local = sdata->local; | |
1087 | struct ieee80211_key *key, *tmp; | |
1088 | ||
1089 | mutex_lock(&local->key_mtx); | |
1090 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) { | |
1091 | if (key->conf.link_id != link->link_id) | |
1092 | continue; | |
1093 | ieee80211_key_replace(key->sdata, link, key->sta, | |
1094 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
1095 | key, NULL); | |
1096 | list_add_tail(&key->list, keys); | |
1097 | } | |
1098 | mutex_unlock(&local->key_mtx); | |
1099 | } | |
1100 | ||
1101 | void ieee80211_free_key_list(struct ieee80211_local *local, | |
1102 | struct list_head *keys) | |
1103 | { | |
1104 | struct ieee80211_key *key, *tmp; | |
1105 | ||
1106 | mutex_lock(&local->key_mtx); | |
1107 | list_for_each_entry_safe(key, tmp, keys, list) | |
1108 | __ieee80211_key_destroy(key, false); | |
1109 | mutex_unlock(&local->key_mtx); | |
1110 | } | |
1111 | ||
7907c7d3 JB |
1112 | void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata, |
1113 | bool force_synchronize) | |
1114 | { | |
1115 | struct ieee80211_local *local = sdata->local; | |
1116 | struct ieee80211_sub_if_data *vlan; | |
f9dca80b | 1117 | struct ieee80211_sub_if_data *master; |
7907c7d3 JB |
1118 | struct ieee80211_key *key, *tmp; |
1119 | LIST_HEAD(keys); | |
1120 | ||
1121 | cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk); | |
1122 | ||
1123 | mutex_lock(&local->key_mtx); | |
1124 | ||
1125 | ieee80211_free_keys_iface(sdata, &keys); | |
1126 | ||
1127 | if (sdata->vif.type == NL80211_IFTYPE_AP) { | |
1128 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
1129 | ieee80211_free_keys_iface(vlan, &keys); | |
6d10e46b JB |
1130 | } |
1131 | ||
7907c7d3 JB |
1132 | if (!list_empty(&keys) || force_synchronize) |
1133 | synchronize_net(); | |
1134 | list_for_each_entry_safe(key, tmp, &keys, list) | |
1135 | __ieee80211_key_destroy(key, false); | |
1136 | ||
f9dca80b MK |
1137 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { |
1138 | if (sdata->bss) { | |
1139 | master = container_of(sdata->bss, | |
1140 | struct ieee80211_sub_if_data, | |
1141 | u.ap); | |
1142 | ||
1143 | WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt != | |
1144 | master->crypto_tx_tailroom_needed_cnt); | |
1145 | } | |
1146 | } else { | |
1147 | WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || | |
1148 | sdata->crypto_tx_tailroom_pending_dec); | |
1149 | } | |
1150 | ||
7907c7d3 JB |
1151 | if (sdata->vif.type == NL80211_IFTYPE_AP) { |
1152 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
1153 | WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt || | |
1154 | vlan->crypto_tx_tailroom_pending_dec); | |
1155 | } | |
8d1f7ecd | 1156 | |
7907c7d3 | 1157 | mutex_unlock(&local->key_mtx); |
11a843b7 | 1158 | } |
c68f4b89 | 1159 | |
6d10e46b JB |
1160 | void ieee80211_free_sta_keys(struct ieee80211_local *local, |
1161 | struct sta_info *sta) | |
1162 | { | |
c8782078 | 1163 | struct ieee80211_key *key; |
6d10e46b JB |
1164 | int i; |
1165 | ||
1166 | mutex_lock(&local->key_mtx); | |
046d2e7c S |
1167 | for (i = 0; i < ARRAY_SIZE(sta->deflink.gtk); i++) { |
1168 | key = key_mtx_dereference(local, sta->deflink.gtk[i]); | |
6d10e46b JB |
1169 | if (!key) |
1170 | continue; | |
ccdde7c7 JB |
1171 | ieee80211_key_replace(key->sdata, NULL, key->sta, |
1172 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
1173 | key, NULL); | |
133bf90d MP |
1174 | __ieee80211_key_destroy(key, key->sdata->vif.type == |
1175 | NL80211_IFTYPE_STATION); | |
6d10e46b JB |
1176 | } |
1177 | ||
2475b1cc MS |
1178 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { |
1179 | key = key_mtx_dereference(local, sta->ptk[i]); | |
1180 | if (!key) | |
1181 | continue; | |
ccdde7c7 JB |
1182 | ieee80211_key_replace(key->sdata, NULL, key->sta, |
1183 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
1184 | key, NULL); | |
133bf90d MP |
1185 | __ieee80211_key_destroy(key, key->sdata->vif.type == |
1186 | NL80211_IFTYPE_STATION); | |
c8782078 | 1187 | } |
6d10e46b JB |
1188 | |
1189 | mutex_unlock(&local->key_mtx); | |
1190 | } | |
1191 | ||
8d1f7ecd JB |
1192 | void ieee80211_delayed_tailroom_dec(struct work_struct *wk) |
1193 | { | |
1194 | struct ieee80211_sub_if_data *sdata; | |
1195 | ||
1196 | sdata = container_of(wk, struct ieee80211_sub_if_data, | |
1197 | dec_tailroom_needed_wk.work); | |
1198 | ||
1199 | /* | |
1200 | * The reason for the delayed tailroom needed decrementing is to | |
1201 | * make roaming faster: during roaming, all keys are first deleted | |
1202 | * and then new keys are installed. The first new key causes the | |
1203 | * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes | |
1204 | * the cost of synchronize_net() (which can be slow). Avoid this | |
1205 | * by deferring the crypto_tx_tailroom_needed_cnt decrementing on | |
1206 | * key removal for a while, so if we roam the value is larger than | |
1207 | * zero and no 0->1 transition happens. | |
1208 | * | |
1209 | * The cost is that if the AP switching was from an AP with keys | |
1210 | * to one without, we still allocate tailroom while it would no | |
1211 | * longer be needed. However, in the typical (fast) roaming case | |
1212 | * within an ESS this usually won't happen. | |
1213 | */ | |
1214 | ||
1215 | mutex_lock(&sdata->local->key_mtx); | |
f9dca80b MK |
1216 | decrease_tailroom_need_count(sdata, |
1217 | sdata->crypto_tx_tailroom_pending_dec); | |
8d1f7ecd JB |
1218 | sdata->crypto_tx_tailroom_pending_dec = 0; |
1219 | mutex_unlock(&sdata->local->key_mtx); | |
1220 | } | |
c68f4b89 JB |
1221 | |
1222 | void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid, | |
1223 | const u8 *replay_ctr, gfp_t gfp) | |
1224 | { | |
1225 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
1226 | ||
1227 | trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr); | |
1228 | ||
1229 | cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp); | |
1230 | } | |
1231 | EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify); | |
3ea542d3 | 1232 | |
3ea542d3 JB |
1233 | void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf, |
1234 | int tid, struct ieee80211_key_seq *seq) | |
1235 | { | |
1236 | struct ieee80211_key *key; | |
1237 | const u8 *pn; | |
1238 | ||
1239 | key = container_of(keyconf, struct ieee80211_key, conf); | |
1240 | ||
1241 | switch (key->conf.cipher) { | |
1242 | case WLAN_CIPHER_SUITE_TKIP: | |
5a306f58 | 1243 | if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) |
3ea542d3 JB |
1244 | return; |
1245 | seq->tkip.iv32 = key->u.tkip.rx[tid].iv32; | |
1246 | seq->tkip.iv16 = key->u.tkip.rx[tid].iv16; | |
1247 | break; | |
1248 | case WLAN_CIPHER_SUITE_CCMP: | |
2b2ba0db | 1249 | case WLAN_CIPHER_SUITE_CCMP_256: |
5a306f58 | 1250 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) |
3ea542d3 JB |
1251 | return; |
1252 | if (tid < 0) | |
5a306f58 | 1253 | pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; |
3ea542d3 JB |
1254 | else |
1255 | pn = key->u.ccmp.rx_pn[tid]; | |
4325f6ca | 1256 | memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN); |
3ea542d3 JB |
1257 | break; |
1258 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
56c52da2 | 1259 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
3ea542d3 JB |
1260 | if (WARN_ON(tid != 0)) |
1261 | return; | |
1262 | pn = key->u.aes_cmac.rx_pn; | |
4325f6ca | 1263 | memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN); |
3ea542d3 | 1264 | break; |
8ade538b JM |
1265 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
1266 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
1267 | if (WARN_ON(tid != 0)) | |
1268 | return; | |
1269 | pn = key->u.aes_gmac.rx_pn; | |
1270 | memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN); | |
1271 | break; | |
00b9cfa3 JM |
1272 | case WLAN_CIPHER_SUITE_GCMP: |
1273 | case WLAN_CIPHER_SUITE_GCMP_256: | |
1274 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) | |
1275 | return; | |
1276 | if (tid < 0) | |
1277 | pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; | |
1278 | else | |
1279 | pn = key->u.gcmp.rx_pn[tid]; | |
1280 | memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN); | |
1281 | break; | |
3ea542d3 JB |
1282 | } |
1283 | } | |
1284 | EXPORT_SYMBOL(ieee80211_get_key_rx_seq); | |
27b3eb9c | 1285 | |
27b3eb9c JB |
1286 | void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf, |
1287 | int tid, struct ieee80211_key_seq *seq) | |
1288 | { | |
1289 | struct ieee80211_key *key; | |
1290 | u8 *pn; | |
1291 | ||
1292 | key = container_of(keyconf, struct ieee80211_key, conf); | |
1293 | ||
1294 | switch (key->conf.cipher) { | |
1295 | case WLAN_CIPHER_SUITE_TKIP: | |
1296 | if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) | |
1297 | return; | |
1298 | key->u.tkip.rx[tid].iv32 = seq->tkip.iv32; | |
1299 | key->u.tkip.rx[tid].iv16 = seq->tkip.iv16; | |
1300 | break; | |
1301 | case WLAN_CIPHER_SUITE_CCMP: | |
2b2ba0db | 1302 | case WLAN_CIPHER_SUITE_CCMP_256: |
27b3eb9c JB |
1303 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) |
1304 | return; | |
1305 | if (tid < 0) | |
1306 | pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; | |
1307 | else | |
1308 | pn = key->u.ccmp.rx_pn[tid]; | |
1309 | memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN); | |
1310 | break; | |
1311 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
56c52da2 | 1312 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
27b3eb9c JB |
1313 | if (WARN_ON(tid != 0)) |
1314 | return; | |
1315 | pn = key->u.aes_cmac.rx_pn; | |
1316 | memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN); | |
1317 | break; | |
8ade538b JM |
1318 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
1319 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
1320 | if (WARN_ON(tid != 0)) | |
1321 | return; | |
1322 | pn = key->u.aes_gmac.rx_pn; | |
1323 | memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN); | |
1324 | break; | |
00b9cfa3 JM |
1325 | case WLAN_CIPHER_SUITE_GCMP: |
1326 | case WLAN_CIPHER_SUITE_GCMP_256: | |
1327 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) | |
1328 | return; | |
1329 | if (tid < 0) | |
1330 | pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS]; | |
1331 | else | |
1332 | pn = key->u.gcmp.rx_pn[tid]; | |
1333 | memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN); | |
1334 | break; | |
27b3eb9c JB |
1335 | default: |
1336 | WARN_ON(1); | |
1337 | break; | |
1338 | } | |
1339 | } | |
1340 | EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq); | |
1341 | ||
1342 | void ieee80211_remove_key(struct ieee80211_key_conf *keyconf) | |
1343 | { | |
1344 | struct ieee80211_key *key; | |
1345 | ||
1346 | key = container_of(keyconf, struct ieee80211_key, conf); | |
1347 | ||
1348 | assert_key_lock(key->local); | |
1349 | ||
1350 | /* | |
1351 | * if key was uploaded, we assume the driver will/has remove(d) | |
1352 | * it, so adjust bookkeeping accordingly | |
1353 | */ | |
1354 | if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { | |
1355 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; | |
1356 | ||
092c4098 AW |
1357 | if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | |
1358 | IEEE80211_KEY_FLAG_PUT_MIC_SPACE | | |
1359 | IEEE80211_KEY_FLAG_RESERVE_TAILROOM))) | |
27b3eb9c JB |
1360 | increment_tailroom_need_count(key->sdata); |
1361 | } | |
1362 | ||
1363 | ieee80211_key_free(key, false); | |
1364 | } | |
1365 | EXPORT_SYMBOL_GPL(ieee80211_remove_key); | |
1366 | ||
1367 | struct ieee80211_key_conf * | |
1368 | ieee80211_gtk_rekey_add(struct ieee80211_vif *vif, | |
1369 | struct ieee80211_key_conf *keyconf) | |
1370 | { | |
1371 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
1372 | struct ieee80211_local *local = sdata->local; | |
1373 | struct ieee80211_key *key; | |
1374 | int err; | |
1375 | ||
1376 | if (WARN_ON(!local->wowlan)) | |
1377 | return ERR_PTR(-EINVAL); | |
1378 | ||
1379 | if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) | |
1380 | return ERR_PTR(-EINVAL); | |
1381 | ||
1382 | key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx, | |
1383 | keyconf->keylen, keyconf->key, | |
23a5f0af | 1384 | 0, NULL); |
27b3eb9c | 1385 | if (IS_ERR(key)) |
c5dc164d | 1386 | return ERR_CAST(key); |
27b3eb9c JB |
1387 | |
1388 | if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED) | |
1389 | key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT; | |
1390 | ||
ccdde7c7 JB |
1391 | /* FIXME: this function needs to get a link ID */ |
1392 | err = ieee80211_key_link(key, &sdata->deflink, NULL); | |
27b3eb9c JB |
1393 | if (err) |
1394 | return ERR_PTR(err); | |
1395 | ||
1396 | return &key->conf; | |
1397 | } | |
1398 | EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add); | |
4271d4bd JB |
1399 | |
1400 | void ieee80211_key_mic_failure(struct ieee80211_key_conf *keyconf) | |
1401 | { | |
1402 | struct ieee80211_key *key; | |
1403 | ||
1404 | key = container_of(keyconf, struct ieee80211_key, conf); | |
1405 | ||
1406 | switch (key->conf.cipher) { | |
1407 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
1408 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: | |
1409 | key->u.aes_cmac.icverrors++; | |
1410 | break; | |
1411 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: | |
1412 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
1413 | key->u.aes_gmac.icverrors++; | |
1414 | break; | |
1415 | default: | |
1416 | /* ignore the others for now, we don't keep counters now */ | |
1417 | break; | |
1418 | } | |
1419 | } | |
1420 | EXPORT_SYMBOL_GPL(ieee80211_key_mic_failure); | |
1421 | ||
1422 | void ieee80211_key_replay(struct ieee80211_key_conf *keyconf) | |
1423 | { | |
1424 | struct ieee80211_key *key; | |
1425 | ||
1426 | key = container_of(keyconf, struct ieee80211_key, conf); | |
1427 | ||
1428 | switch (key->conf.cipher) { | |
1429 | case WLAN_CIPHER_SUITE_CCMP: | |
1430 | case WLAN_CIPHER_SUITE_CCMP_256: | |
1431 | key->u.ccmp.replays++; | |
1432 | break; | |
1433 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
1434 | case WLAN_CIPHER_SUITE_BIP_CMAC_256: | |
1435 | key->u.aes_cmac.replays++; | |
1436 | break; | |
1437 | case WLAN_CIPHER_SUITE_BIP_GMAC_128: | |
1438 | case WLAN_CIPHER_SUITE_BIP_GMAC_256: | |
1439 | key->u.aes_gmac.replays++; | |
1440 | break; | |
1441 | case WLAN_CIPHER_SUITE_GCMP: | |
1442 | case WLAN_CIPHER_SUITE_GCMP_256: | |
1443 | key->u.gcmp.replays++; | |
1444 | break; | |
1445 | } | |
1446 | } | |
1447 | EXPORT_SYMBOL_GPL(ieee80211_key_replay); | |
3d901102 JB |
1448 | |
1449 | int ieee80211_key_switch_links(struct ieee80211_sub_if_data *sdata, | |
1450 | unsigned long del_links_mask, | |
1451 | unsigned long add_links_mask) | |
1452 | { | |
1453 | struct ieee80211_key *key; | |
1454 | int ret; | |
1455 | ||
1456 | list_for_each_entry(key, &sdata->key_list, list) { | |
1457 | if (key->conf.link_id < 0 || | |
1458 | !(del_links_mask & BIT(key->conf.link_id))) | |
1459 | continue; | |
1460 | ||
1461 | /* shouldn't happen for per-link keys */ | |
1462 | WARN_ON(key->sta); | |
1463 | ||
1464 | ieee80211_key_disable_hw_accel(key); | |
1465 | } | |
1466 | ||
1467 | list_for_each_entry(key, &sdata->key_list, list) { | |
1468 | if (key->conf.link_id < 0 || | |
1469 | !(add_links_mask & BIT(key->conf.link_id))) | |
1470 | continue; | |
1471 | ||
1472 | /* shouldn't happen for per-link keys */ | |
1473 | WARN_ON(key->sta); | |
1474 | ||
1475 | ret = ieee80211_key_enable_hw_accel(key); | |
1476 | if (ret) | |
1477 | return ret; | |
1478 | } | |
1479 | ||
1480 | return 0; | |
1481 | } |