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1f5a7e47 JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
3b96766f | 5 | * Copyright 2007-2008 Johannes Berg <johannes@sipsolutions.net> |
1f5a7e47 JB |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
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> |
d26ad377 | 20 | #include <asm/unaligned.h> |
1f5a7e47 | 21 | #include "ieee80211_i.h" |
24487981 | 22 | #include "driver-ops.h" |
1f5a7e47 JB |
23 | #include "debugfs_key.h" |
24 | #include "aes_ccm.h" | |
3cfcf6ac | 25 | #include "aes_cmac.h" |
1f5a7e47 | 26 | |
11a843b7 | 27 | |
dbbea671 JB |
28 | /** |
29 | * DOC: Key handling basics | |
11a843b7 JB |
30 | * |
31 | * Key handling in mac80211 is done based on per-interface (sub_if_data) | |
32 | * keys and per-station keys. Since each station belongs to an interface, | |
33 | * each station key also belongs to that interface. | |
34 | * | |
b5c34f66 JB |
35 | * Hardware acceleration is done on a best-effort basis for algorithms |
36 | * that are implemented in software, for each key the hardware is asked | |
37 | * to enable that key for offloading but if it cannot do that the key is | |
38 | * simply kept for software encryption (unless it is for an algorithm | |
39 | * that isn't implemented in software). | |
40 | * There is currently no way of knowing whether a key is handled in SW | |
41 | * or HW except by looking into debugfs. | |
11a843b7 | 42 | * |
b5c34f66 JB |
43 | * All key management is internally protected by a mutex. Within all |
44 | * other parts of mac80211, key references are, just as STA structure | |
45 | * references, protected by RCU. Note, however, that some things are | |
46 | * unprotected, namely the key->sta dereferences within the hardware | |
47 | * acceleration functions. This means that sta_info_destroy() must | |
48 | * remove the key which waits for an RCU grace period. | |
11a843b7 JB |
49 | */ |
50 | ||
51 | static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; | |
11a843b7 | 52 | |
ad0e2b5a | 53 | static void assert_key_lock(struct ieee80211_local *local) |
3b96766f | 54 | { |
46a5ebaf | 55 | lockdep_assert_held(&local->key_mtx); |
3b96766f JB |
56 | } |
57 | ||
3bff1865 YAP |
58 | static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata) |
59 | { | |
60 | /* | |
61 | * When this count is zero, SKB resizing for allocating tailroom | |
62 | * for IV or MMIC is skipped. But, this check has created two race | |
63 | * cases in xmit path while transiting from zero count to one: | |
64 | * | |
65 | * 1. SKB resize was skipped because no key was added but just before | |
66 | * the xmit key is added and SW encryption kicks off. | |
67 | * | |
68 | * 2. SKB resize was skipped because all the keys were hw planted but | |
69 | * just before xmit one of the key is deleted and SW encryption kicks | |
70 | * off. | |
71 | * | |
72 | * In both the above case SW encryption will find not enough space for | |
73 | * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c) | |
74 | * | |
75 | * Solution has been explained at | |
76 | * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net | |
77 | */ | |
78 | ||
79 | if (!sdata->crypto_tx_tailroom_needed_cnt++) { | |
80 | /* | |
81 | * Flush all XMIT packets currently using HW encryption or no | |
82 | * encryption at all if the count transition is from 0 -> 1. | |
83 | */ | |
84 | synchronize_net(); | |
85 | } | |
86 | } | |
87 | ||
3ffc2a90 | 88 | static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key) |
11a843b7 | 89 | { |
dc822b5d | 90 | struct ieee80211_sub_if_data *sdata; |
89c91cae | 91 | struct sta_info *sta; |
11a843b7 JB |
92 | int ret; |
93 | ||
3b96766f JB |
94 | might_sleep(); |
95 | ||
27b3eb9c JB |
96 | if (key->flags & KEY_FLAG_TAINTED) |
97 | return -EINVAL; | |
98 | ||
e31b8213 | 99 | if (!key->local->ops->set_key) |
3ffc2a90 | 100 | goto out_unsupported; |
11a843b7 | 101 | |
ad0e2b5a JB |
102 | assert_key_lock(key->local); |
103 | ||
89c91cae | 104 | sta = key->sta; |
dc822b5d | 105 | |
e31b8213 JB |
106 | /* |
107 | * If this is a per-STA GTK, check if it | |
108 | * is supported; if not, return. | |
109 | */ | |
110 | if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) && | |
111 | !(key->local->hw.flags & IEEE80211_HW_SUPPORTS_PER_STA_GTK)) | |
112 | goto out_unsupported; | |
113 | ||
89c91cae JB |
114 | if (sta && !sta->uploaded) |
115 | goto out_unsupported; | |
116 | ||
dc822b5d | 117 | sdata = key->sdata; |
18890d4b HS |
118 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { |
119 | /* | |
120 | * The driver doesn't know anything about VLAN interfaces. | |
121 | * Hence, don't send GTKs for VLAN interfaces to the driver. | |
122 | */ | |
123 | if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) | |
124 | goto out_unsupported; | |
18890d4b | 125 | } |
11a843b7 | 126 | |
89c91cae JB |
127 | ret = drv_set_key(key->local, SET_KEY, sdata, |
128 | sta ? &sta->sta : NULL, &key->conf); | |
11a843b7 | 129 | |
e31b8213 | 130 | if (!ret) { |
11a843b7 | 131 | key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; |
3bff1865 YAP |
132 | |
133 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || | |
077a9154 AN |
134 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) || |
135 | (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))) | |
3bff1865 YAP |
136 | sdata->crypto_tx_tailroom_needed_cnt--; |
137 | ||
077a9154 AN |
138 | WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && |
139 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)); | |
140 | ||
e31b8213 JB |
141 | return 0; |
142 | } | |
11a843b7 | 143 | |
e31b8213 | 144 | if (ret != -ENOSPC && ret != -EOPNOTSUPP) |
bdcbd8e0 | 145 | sdata_err(sdata, |
0fb9a9ec | 146 | "failed to set key (%d, %pM) to hardware (%d)\n", |
89c91cae JB |
147 | key->conf.keyidx, |
148 | sta ? sta->sta.addr : bcast_addr, ret); | |
3ffc2a90 | 149 | |
e31b8213 JB |
150 | out_unsupported: |
151 | switch (key->conf.cipher) { | |
152 | case WLAN_CIPHER_SUITE_WEP40: | |
153 | case WLAN_CIPHER_SUITE_WEP104: | |
154 | case WLAN_CIPHER_SUITE_TKIP: | |
155 | case WLAN_CIPHER_SUITE_CCMP: | |
156 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
157 | /* all of these we can do in software */ | |
158 | return 0; | |
159 | default: | |
160 | return -EINVAL; | |
3ffc2a90 | 161 | } |
11a843b7 JB |
162 | } |
163 | ||
164 | static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key) | |
165 | { | |
dc822b5d | 166 | struct ieee80211_sub_if_data *sdata; |
89c91cae | 167 | struct sta_info *sta; |
11a843b7 JB |
168 | int ret; |
169 | ||
3b96766f JB |
170 | might_sleep(); |
171 | ||
db4d1169 | 172 | if (!key || !key->local->ops->set_key) |
11a843b7 JB |
173 | return; |
174 | ||
ad0e2b5a JB |
175 | assert_key_lock(key->local); |
176 | ||
177 | if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) | |
11a843b7 JB |
178 | return; |
179 | ||
89c91cae | 180 | sta = key->sta; |
dc822b5d JB |
181 | sdata = key->sdata; |
182 | ||
3bff1865 | 183 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
077a9154 AN |
184 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) || |
185 | (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))) | |
3bff1865 YAP |
186 | increment_tailroom_need_count(sdata); |
187 | ||
12375ef9 | 188 | ret = drv_set_key(key->local, DISABLE_KEY, sdata, |
89c91cae | 189 | sta ? &sta->sta : NULL, &key->conf); |
11a843b7 JB |
190 | |
191 | if (ret) | |
bdcbd8e0 | 192 | sdata_err(sdata, |
0fb9a9ec | 193 | "failed to remove key (%d, %pM) from hardware (%d)\n", |
89c91cae JB |
194 | key->conf.keyidx, |
195 | sta ? sta->sta.addr : bcast_addr, ret); | |
11a843b7 | 196 | |
3b96766f | 197 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; |
3b96766f JB |
198 | } |
199 | ||
200 | static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, | |
f7e0104c | 201 | int idx, bool uni, bool multi) |
3b96766f JB |
202 | { |
203 | struct ieee80211_key *key = NULL; | |
204 | ||
ad0e2b5a JB |
205 | assert_key_lock(sdata->local); |
206 | ||
3b96766f | 207 | if (idx >= 0 && idx < NUM_DEFAULT_KEYS) |
40b275b6 | 208 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
3b96766f | 209 | |
de5fad81 | 210 | if (uni) { |
f7e0104c | 211 | rcu_assign_pointer(sdata->default_unicast_key, key); |
de5fad81 YD |
212 | drv_set_default_unicast_key(sdata->local, sdata, idx); |
213 | } | |
214 | ||
f7e0104c JB |
215 | if (multi) |
216 | rcu_assign_pointer(sdata->default_multicast_key, key); | |
3b96766f | 217 | |
f7e0104c | 218 | ieee80211_debugfs_key_update_default(sdata); |
3b96766f JB |
219 | } |
220 | ||
f7e0104c JB |
221 | void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx, |
222 | bool uni, bool multi) | |
3b96766f | 223 | { |
ad0e2b5a | 224 | mutex_lock(&sdata->local->key_mtx); |
f7e0104c | 225 | __ieee80211_set_default_key(sdata, idx, uni, multi); |
ad0e2b5a | 226 | mutex_unlock(&sdata->local->key_mtx); |
3b96766f JB |
227 | } |
228 | ||
3cfcf6ac JM |
229 | static void |
230 | __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx) | |
231 | { | |
232 | struct ieee80211_key *key = NULL; | |
233 | ||
ad0e2b5a JB |
234 | assert_key_lock(sdata->local); |
235 | ||
3cfcf6ac JM |
236 | if (idx >= NUM_DEFAULT_KEYS && |
237 | idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
40b275b6 | 238 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
3cfcf6ac JM |
239 | |
240 | rcu_assign_pointer(sdata->default_mgmt_key, key); | |
241 | ||
f7e0104c | 242 | ieee80211_debugfs_key_update_default(sdata); |
3cfcf6ac JM |
243 | } |
244 | ||
245 | void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, | |
246 | int idx) | |
247 | { | |
ad0e2b5a | 248 | mutex_lock(&sdata->local->key_mtx); |
3cfcf6ac | 249 | __ieee80211_set_default_mgmt_key(sdata, idx); |
ad0e2b5a | 250 | mutex_unlock(&sdata->local->key_mtx); |
3cfcf6ac JM |
251 | } |
252 | ||
3b96766f | 253 | |
3b8d9c29 JB |
254 | static void ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, |
255 | struct sta_info *sta, | |
256 | bool pairwise, | |
257 | struct ieee80211_key *old, | |
258 | struct ieee80211_key *new) | |
3b96766f | 259 | { |
f7e0104c JB |
260 | int idx; |
261 | bool defunikey, defmultikey, defmgmtkey; | |
3b96766f JB |
262 | |
263 | if (new) | |
f850e00f | 264 | list_add_tail(&new->list, &sdata->key_list); |
3b96766f | 265 | |
e31b8213 JB |
266 | if (sta && pairwise) { |
267 | rcu_assign_pointer(sta->ptk, new); | |
268 | } else if (sta) { | |
269 | if (old) | |
270 | idx = old->conf.keyidx; | |
271 | else | |
272 | idx = new->conf.keyidx; | |
273 | rcu_assign_pointer(sta->gtk[idx], new); | |
3b96766f JB |
274 | } else { |
275 | WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx); | |
276 | ||
277 | if (old) | |
278 | idx = old->conf.keyidx; | |
279 | else | |
280 | idx = new->conf.keyidx; | |
281 | ||
40b275b6 JB |
282 | defunikey = old && |
283 | old == key_mtx_dereference(sdata->local, | |
284 | sdata->default_unicast_key); | |
285 | defmultikey = old && | |
286 | old == key_mtx_dereference(sdata->local, | |
287 | sdata->default_multicast_key); | |
288 | defmgmtkey = old && | |
289 | old == key_mtx_dereference(sdata->local, | |
290 | sdata->default_mgmt_key); | |
3b96766f | 291 | |
f7e0104c JB |
292 | if (defunikey && !new) |
293 | __ieee80211_set_default_key(sdata, -1, true, false); | |
294 | if (defmultikey && !new) | |
295 | __ieee80211_set_default_key(sdata, -1, false, true); | |
3cfcf6ac JM |
296 | if (defmgmtkey && !new) |
297 | __ieee80211_set_default_mgmt_key(sdata, -1); | |
3b96766f JB |
298 | |
299 | rcu_assign_pointer(sdata->keys[idx], new); | |
f7e0104c JB |
300 | if (defunikey && new) |
301 | __ieee80211_set_default_key(sdata, new->conf.keyidx, | |
302 | true, false); | |
303 | if (defmultikey && new) | |
304 | __ieee80211_set_default_key(sdata, new->conf.keyidx, | |
305 | false, true); | |
3cfcf6ac JM |
306 | if (defmgmtkey && new) |
307 | __ieee80211_set_default_mgmt_key(sdata, | |
308 | new->conf.keyidx); | |
3b96766f JB |
309 | } |
310 | ||
b5c34f66 JB |
311 | if (old) |
312 | list_del(&old->list); | |
11a843b7 JB |
313 | } |
314 | ||
97359d12 | 315 | struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, |
faa8fdc8 JM |
316 | const u8 *key_data, |
317 | size_t seq_len, const u8 *seq) | |
1f5a7e47 JB |
318 | { |
319 | struct ieee80211_key *key; | |
1ac62ba7 | 320 | int i, j, err; |
1f5a7e47 | 321 | |
3cfcf6ac | 322 | BUG_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS); |
11a843b7 JB |
323 | |
324 | key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); | |
1f5a7e47 | 325 | if (!key) |
1ac62ba7 | 326 | return ERR_PTR(-ENOMEM); |
11a843b7 JB |
327 | |
328 | /* | |
329 | * Default to software encryption; we'll later upload the | |
330 | * key to the hardware if possible. | |
331 | */ | |
11a843b7 JB |
332 | key->conf.flags = 0; |
333 | key->flags = 0; | |
334 | ||
97359d12 | 335 | key->conf.cipher = cipher; |
11a843b7 JB |
336 | key->conf.keyidx = idx; |
337 | key->conf.keylen = key_len; | |
97359d12 JB |
338 | switch (cipher) { |
339 | case WLAN_CIPHER_SUITE_WEP40: | |
340 | case WLAN_CIPHER_SUITE_WEP104: | |
4325f6ca JB |
341 | key->conf.iv_len = IEEE80211_WEP_IV_LEN; |
342 | key->conf.icv_len = IEEE80211_WEP_ICV_LEN; | |
76708dee | 343 | break; |
97359d12 | 344 | case WLAN_CIPHER_SUITE_TKIP: |
4325f6ca JB |
345 | key->conf.iv_len = IEEE80211_TKIP_IV_LEN; |
346 | key->conf.icv_len = IEEE80211_TKIP_ICV_LEN; | |
9f26a952 | 347 | if (seq) { |
5a306f58 | 348 | for (i = 0; i < IEEE80211_NUM_TIDS; i++) { |
faa8fdc8 JM |
349 | key->u.tkip.rx[i].iv32 = |
350 | get_unaligned_le32(&seq[2]); | |
351 | key->u.tkip.rx[i].iv16 = | |
352 | get_unaligned_le16(seq); | |
353 | } | |
354 | } | |
523b02ea | 355 | spin_lock_init(&key->u.tkip.txlock); |
76708dee | 356 | break; |
97359d12 | 357 | case WLAN_CIPHER_SUITE_CCMP: |
4325f6ca JB |
358 | key->conf.iv_len = IEEE80211_CCMP_HDR_LEN; |
359 | key->conf.icv_len = IEEE80211_CCMP_MIC_LEN; | |
9f26a952 | 360 | if (seq) { |
5a306f58 | 361 | for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) |
4325f6ca | 362 | for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++) |
faa8fdc8 | 363 | key->u.ccmp.rx_pn[i][j] = |
4325f6ca | 364 | seq[IEEE80211_CCMP_PN_LEN - j - 1]; |
faa8fdc8 | 365 | } |
11a843b7 JB |
366 | /* |
367 | * Initialize AES key state here as an optimization so that | |
368 | * it does not need to be initialized for every packet. | |
369 | */ | |
370 | key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(key_data); | |
1ac62ba7 BH |
371 | if (IS_ERR(key->u.ccmp.tfm)) { |
372 | err = PTR_ERR(key->u.ccmp.tfm); | |
3b96766f | 373 | kfree(key); |
1f951a7f | 374 | return ERR_PTR(err); |
11a843b7 | 375 | } |
60ae0f20 JB |
376 | break; |
377 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
378 | key->conf.iv_len = 0; | |
379 | key->conf.icv_len = sizeof(struct ieee80211_mmie); | |
380 | if (seq) | |
4325f6ca | 381 | for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++) |
0f927323 | 382 | key->u.aes_cmac.rx_pn[j] = |
4325f6ca | 383 | seq[IEEE80211_CMAC_PN_LEN - j - 1]; |
3cfcf6ac JM |
384 | /* |
385 | * Initialize AES key state here as an optimization so that | |
386 | * it does not need to be initialized for every packet. | |
387 | */ | |
388 | key->u.aes_cmac.tfm = | |
389 | ieee80211_aes_cmac_key_setup(key_data); | |
1ac62ba7 BH |
390 | if (IS_ERR(key->u.aes_cmac.tfm)) { |
391 | err = PTR_ERR(key->u.aes_cmac.tfm); | |
3cfcf6ac | 392 | kfree(key); |
1f951a7f | 393 | return ERR_PTR(err); |
3cfcf6ac | 394 | } |
60ae0f20 | 395 | break; |
3cfcf6ac | 396 | } |
60ae0f20 JB |
397 | memcpy(key->conf.key, key_data, key_len); |
398 | INIT_LIST_HEAD(&key->list); | |
3cfcf6ac | 399 | |
db4d1169 JB |
400 | return key; |
401 | } | |
11a843b7 | 402 | |
79cf2dfa JB |
403 | static void ieee80211_key_free_common(struct ieee80211_key *key) |
404 | { | |
405 | if (key->conf.cipher == WLAN_CIPHER_SUITE_CCMP) | |
406 | ieee80211_aes_key_free(key->u.ccmp.tfm); | |
407 | if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC) | |
408 | ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); | |
409 | kfree(key); | |
410 | } | |
411 | ||
6d10e46b JB |
412 | static void __ieee80211_key_destroy(struct ieee80211_key *key, |
413 | bool delay_tailroom) | |
ad0e2b5a | 414 | { |
32162a4d JM |
415 | if (key->local) |
416 | ieee80211_key_disable_hw_accel(key); | |
ad0e2b5a | 417 | |
3bff1865 | 418 | if (key->local) { |
8d1f7ecd JB |
419 | struct ieee80211_sub_if_data *sdata = key->sdata; |
420 | ||
32162a4d | 421 | ieee80211_debugfs_key_remove(key); |
8d1f7ecd JB |
422 | |
423 | if (delay_tailroom) { | |
424 | /* see ieee80211_delayed_tailroom_dec */ | |
425 | sdata->crypto_tx_tailroom_pending_dec++; | |
426 | schedule_delayed_work(&sdata->dec_tailroom_needed_wk, | |
427 | HZ/2); | |
428 | } else { | |
429 | sdata->crypto_tx_tailroom_needed_cnt--; | |
430 | } | |
3bff1865 | 431 | } |
ad0e2b5a | 432 | |
79cf2dfa JB |
433 | ieee80211_key_free_common(key); |
434 | } | |
435 | ||
6d10e46b JB |
436 | static void ieee80211_key_destroy(struct ieee80211_key *key, |
437 | bool delay_tailroom) | |
438 | { | |
439 | if (!key) | |
440 | return; | |
441 | ||
442 | /* | |
443 | * Synchronize so the TX path can no longer be using | |
444 | * this key before we free/remove it. | |
445 | */ | |
446 | synchronize_net(); | |
447 | ||
448 | __ieee80211_key_destroy(key, delay_tailroom); | |
449 | } | |
450 | ||
79cf2dfa JB |
451 | void ieee80211_key_free_unused(struct ieee80211_key *key) |
452 | { | |
453 | WARN_ON(key->sdata || key->local); | |
454 | ieee80211_key_free_common(key); | |
ad0e2b5a JB |
455 | } |
456 | ||
3ffc2a90 JB |
457 | int ieee80211_key_link(struct ieee80211_key *key, |
458 | struct ieee80211_sub_if_data *sdata, | |
459 | struct sta_info *sta) | |
db4d1169 | 460 | { |
27b3eb9c | 461 | struct ieee80211_local *local = sdata->local; |
db4d1169 | 462 | struct ieee80211_key *old_key; |
3ffc2a90 | 463 | int idx, ret; |
67aa030c | 464 | bool pairwise; |
db4d1169 | 465 | |
db4d1169 JB |
466 | BUG_ON(!sdata); |
467 | BUG_ON(!key); | |
468 | ||
67aa030c | 469 | pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE; |
db4d1169 JB |
470 | idx = key->conf.keyidx; |
471 | key->local = sdata->local; | |
472 | key->sdata = sdata; | |
473 | key->sta = sta; | |
474 | ||
ad0e2b5a | 475 | mutex_lock(&sdata->local->key_mtx); |
3b96766f | 476 | |
e31b8213 | 477 | if (sta && pairwise) |
40b275b6 | 478 | old_key = key_mtx_dereference(sdata->local, sta->ptk); |
e31b8213 | 479 | else if (sta) |
40b275b6 | 480 | old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]); |
d4e46a3d | 481 | else |
40b275b6 | 482 | old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
db4d1169 | 483 | |
3bff1865 YAP |
484 | increment_tailroom_need_count(sdata); |
485 | ||
3b8d9c29 JB |
486 | ieee80211_key_replace(sdata, sta, pairwise, old_key, key); |
487 | ieee80211_key_destroy(old_key, true); | |
d4e46a3d | 488 | |
ad0e2b5a | 489 | ieee80211_debugfs_key_add(key); |
db4d1169 | 490 | |
27b3eb9c JB |
491 | if (!local->wowlan) { |
492 | ret = ieee80211_key_enable_hw_accel(key); | |
493 | if (ret) | |
494 | ieee80211_key_free(key, true); | |
495 | } else { | |
496 | ret = 0; | |
497 | } | |
79cf2dfa | 498 | |
ad0e2b5a | 499 | mutex_unlock(&sdata->local->key_mtx); |
3ffc2a90 JB |
500 | |
501 | return ret; | |
1f5a7e47 JB |
502 | } |
503 | ||
3b8d9c29 | 504 | void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom) |
1f5a7e47 | 505 | { |
5c0c3641 JB |
506 | if (!key) |
507 | return; | |
508 | ||
3b96766f JB |
509 | /* |
510 | * Replace key with nothingness if it was ever used. | |
511 | */ | |
3a245766 | 512 | if (key->sdata) |
3b8d9c29 | 513 | ieee80211_key_replace(key->sdata, key->sta, |
e31b8213 JB |
514 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, |
515 | key, NULL); | |
3b8d9c29 | 516 | ieee80211_key_destroy(key, delay_tailroom); |
3b96766f | 517 | } |
d4e46a3d | 518 | |
ad0e2b5a | 519 | void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata) |
3a245766 JB |
520 | { |
521 | struct ieee80211_key *key; | |
11a843b7 | 522 | |
3a245766 | 523 | ASSERT_RTNL(); |
11a843b7 | 524 | |
9607e6b6 | 525 | if (WARN_ON(!ieee80211_sdata_running(sdata))) |
3a245766 | 526 | return; |
11a843b7 | 527 | |
ad0e2b5a | 528 | mutex_lock(&sdata->local->key_mtx); |
11a843b7 | 529 | |
3bff1865 YAP |
530 | sdata->crypto_tx_tailroom_needed_cnt = 0; |
531 | ||
532 | list_for_each_entry(key, &sdata->key_list, list) { | |
533 | increment_tailroom_need_count(sdata); | |
ad0e2b5a | 534 | ieee80211_key_enable_hw_accel(key); |
3bff1865 | 535 | } |
3b96766f | 536 | |
ad0e2b5a | 537 | mutex_unlock(&sdata->local->key_mtx); |
11a843b7 JB |
538 | } |
539 | ||
830af02f JB |
540 | void ieee80211_iter_keys(struct ieee80211_hw *hw, |
541 | struct ieee80211_vif *vif, | |
542 | void (*iter)(struct ieee80211_hw *hw, | |
543 | struct ieee80211_vif *vif, | |
544 | struct ieee80211_sta *sta, | |
545 | struct ieee80211_key_conf *key, | |
546 | void *data), | |
547 | void *iter_data) | |
548 | { | |
549 | struct ieee80211_local *local = hw_to_local(hw); | |
27b3eb9c | 550 | struct ieee80211_key *key, *tmp; |
830af02f JB |
551 | struct ieee80211_sub_if_data *sdata; |
552 | ||
553 | ASSERT_RTNL(); | |
554 | ||
555 | mutex_lock(&local->key_mtx); | |
556 | if (vif) { | |
557 | sdata = vif_to_sdata(vif); | |
27b3eb9c | 558 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) |
830af02f JB |
559 | iter(hw, &sdata->vif, |
560 | key->sta ? &key->sta->sta : NULL, | |
561 | &key->conf, iter_data); | |
562 | } else { | |
563 | list_for_each_entry(sdata, &local->interfaces, list) | |
27b3eb9c JB |
564 | list_for_each_entry_safe(key, tmp, |
565 | &sdata->key_list, list) | |
830af02f JB |
566 | iter(hw, &sdata->vif, |
567 | key->sta ? &key->sta->sta : NULL, | |
568 | &key->conf, iter_data); | |
569 | } | |
570 | mutex_unlock(&local->key_mtx); | |
571 | } | |
572 | EXPORT_SYMBOL(ieee80211_iter_keys); | |
573 | ||
3b96766f JB |
574 | void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata) |
575 | { | |
576 | struct ieee80211_key *key, *tmp; | |
6d10e46b | 577 | LIST_HEAD(keys); |
db4d1169 | 578 | |
8d1f7ecd JB |
579 | cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk); |
580 | ||
ad0e2b5a | 581 | mutex_lock(&sdata->local->key_mtx); |
3b96766f | 582 | |
8d1f7ecd JB |
583 | sdata->crypto_tx_tailroom_needed_cnt -= |
584 | sdata->crypto_tx_tailroom_pending_dec; | |
585 | sdata->crypto_tx_tailroom_pending_dec = 0; | |
586 | ||
3cfcf6ac | 587 | ieee80211_debugfs_key_remove_mgmt_default(sdata); |
3b96766f | 588 | |
6d10e46b JB |
589 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) { |
590 | ieee80211_key_replace(key->sdata, key->sta, | |
591 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
592 | key, NULL); | |
593 | list_add_tail(&key->list, &keys); | |
594 | } | |
3b96766f | 595 | |
f7e0104c JB |
596 | ieee80211_debugfs_key_update_default(sdata); |
597 | ||
6d10e46b JB |
598 | if (!list_empty(&keys)) { |
599 | synchronize_net(); | |
600 | list_for_each_entry_safe(key, tmp, &keys, list) | |
601 | __ieee80211_key_destroy(key, false); | |
602 | } | |
603 | ||
8d1f7ecd JB |
604 | WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || |
605 | sdata->crypto_tx_tailroom_pending_dec); | |
606 | ||
ad0e2b5a | 607 | mutex_unlock(&sdata->local->key_mtx); |
11a843b7 | 608 | } |
c68f4b89 | 609 | |
6d10e46b JB |
610 | void ieee80211_free_sta_keys(struct ieee80211_local *local, |
611 | struct sta_info *sta) | |
612 | { | |
613 | struct ieee80211_key *key, *tmp; | |
614 | LIST_HEAD(keys); | |
615 | int i; | |
616 | ||
617 | mutex_lock(&local->key_mtx); | |
618 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { | |
619 | key = key_mtx_dereference(local, sta->gtk[i]); | |
620 | if (!key) | |
621 | continue; | |
622 | ieee80211_key_replace(key->sdata, key->sta, | |
623 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
624 | key, NULL); | |
625 | list_add(&key->list, &keys); | |
626 | } | |
627 | ||
628 | key = key_mtx_dereference(local, sta->ptk); | |
629 | if (key) { | |
630 | ieee80211_key_replace(key->sdata, key->sta, | |
631 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
632 | key, NULL); | |
633 | list_add(&key->list, &keys); | |
634 | } | |
635 | ||
636 | /* | |
637 | * NB: the station code relies on this being | |
638 | * done even if there aren't any keys | |
639 | */ | |
640 | synchronize_net(); | |
641 | ||
642 | list_for_each_entry_safe(key, tmp, &keys, list) | |
643 | __ieee80211_key_destroy(key, true); | |
644 | ||
645 | mutex_unlock(&local->key_mtx); | |
646 | } | |
647 | ||
8d1f7ecd JB |
648 | void ieee80211_delayed_tailroom_dec(struct work_struct *wk) |
649 | { | |
650 | struct ieee80211_sub_if_data *sdata; | |
651 | ||
652 | sdata = container_of(wk, struct ieee80211_sub_if_data, | |
653 | dec_tailroom_needed_wk.work); | |
654 | ||
655 | /* | |
656 | * The reason for the delayed tailroom needed decrementing is to | |
657 | * make roaming faster: during roaming, all keys are first deleted | |
658 | * and then new keys are installed. The first new key causes the | |
659 | * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes | |
660 | * the cost of synchronize_net() (which can be slow). Avoid this | |
661 | * by deferring the crypto_tx_tailroom_needed_cnt decrementing on | |
662 | * key removal for a while, so if we roam the value is larger than | |
663 | * zero and no 0->1 transition happens. | |
664 | * | |
665 | * The cost is that if the AP switching was from an AP with keys | |
666 | * to one without, we still allocate tailroom while it would no | |
667 | * longer be needed. However, in the typical (fast) roaming case | |
668 | * within an ESS this usually won't happen. | |
669 | */ | |
670 | ||
671 | mutex_lock(&sdata->local->key_mtx); | |
672 | sdata->crypto_tx_tailroom_needed_cnt -= | |
673 | sdata->crypto_tx_tailroom_pending_dec; | |
674 | sdata->crypto_tx_tailroom_pending_dec = 0; | |
675 | mutex_unlock(&sdata->local->key_mtx); | |
676 | } | |
c68f4b89 JB |
677 | |
678 | void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid, | |
679 | const u8 *replay_ctr, gfp_t gfp) | |
680 | { | |
681 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
682 | ||
683 | trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr); | |
684 | ||
685 | cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp); | |
686 | } | |
687 | EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify); | |
3ea542d3 JB |
688 | |
689 | void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf, | |
690 | struct ieee80211_key_seq *seq) | |
691 | { | |
692 | struct ieee80211_key *key; | |
693 | u64 pn64; | |
694 | ||
695 | if (WARN_ON(!(keyconf->flags & IEEE80211_KEY_FLAG_GENERATE_IV))) | |
696 | return; | |
697 | ||
698 | key = container_of(keyconf, struct ieee80211_key, conf); | |
699 | ||
700 | switch (key->conf.cipher) { | |
701 | case WLAN_CIPHER_SUITE_TKIP: | |
702 | seq->tkip.iv32 = key->u.tkip.tx.iv32; | |
703 | seq->tkip.iv16 = key->u.tkip.tx.iv16; | |
704 | break; | |
705 | case WLAN_CIPHER_SUITE_CCMP: | |
706 | pn64 = atomic64_read(&key->u.ccmp.tx_pn); | |
707 | seq->ccmp.pn[5] = pn64; | |
708 | seq->ccmp.pn[4] = pn64 >> 8; | |
709 | seq->ccmp.pn[3] = pn64 >> 16; | |
710 | seq->ccmp.pn[2] = pn64 >> 24; | |
711 | seq->ccmp.pn[1] = pn64 >> 32; | |
712 | seq->ccmp.pn[0] = pn64 >> 40; | |
713 | break; | |
714 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
715 | pn64 = atomic64_read(&key->u.aes_cmac.tx_pn); | |
716 | seq->ccmp.pn[5] = pn64; | |
717 | seq->ccmp.pn[4] = pn64 >> 8; | |
718 | seq->ccmp.pn[3] = pn64 >> 16; | |
719 | seq->ccmp.pn[2] = pn64 >> 24; | |
720 | seq->ccmp.pn[1] = pn64 >> 32; | |
721 | seq->ccmp.pn[0] = pn64 >> 40; | |
722 | break; | |
723 | default: | |
724 | WARN_ON(1); | |
725 | } | |
726 | } | |
727 | EXPORT_SYMBOL(ieee80211_get_key_tx_seq); | |
728 | ||
729 | void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf, | |
730 | int tid, struct ieee80211_key_seq *seq) | |
731 | { | |
732 | struct ieee80211_key *key; | |
733 | const u8 *pn; | |
734 | ||
735 | key = container_of(keyconf, struct ieee80211_key, conf); | |
736 | ||
737 | switch (key->conf.cipher) { | |
738 | case WLAN_CIPHER_SUITE_TKIP: | |
5a306f58 | 739 | if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) |
3ea542d3 JB |
740 | return; |
741 | seq->tkip.iv32 = key->u.tkip.rx[tid].iv32; | |
742 | seq->tkip.iv16 = key->u.tkip.rx[tid].iv16; | |
743 | break; | |
744 | case WLAN_CIPHER_SUITE_CCMP: | |
5a306f58 | 745 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) |
3ea542d3 JB |
746 | return; |
747 | if (tid < 0) | |
5a306f58 | 748 | pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; |
3ea542d3 JB |
749 | else |
750 | pn = key->u.ccmp.rx_pn[tid]; | |
4325f6ca | 751 | memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN); |
3ea542d3 JB |
752 | break; |
753 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
754 | if (WARN_ON(tid != 0)) | |
755 | return; | |
756 | pn = key->u.aes_cmac.rx_pn; | |
4325f6ca | 757 | memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN); |
3ea542d3 JB |
758 | break; |
759 | } | |
760 | } | |
761 | EXPORT_SYMBOL(ieee80211_get_key_rx_seq); | |
27b3eb9c JB |
762 | |
763 | void ieee80211_set_key_tx_seq(struct ieee80211_key_conf *keyconf, | |
764 | struct ieee80211_key_seq *seq) | |
765 | { | |
766 | struct ieee80211_key *key; | |
767 | u64 pn64; | |
768 | ||
769 | key = container_of(keyconf, struct ieee80211_key, conf); | |
770 | ||
771 | switch (key->conf.cipher) { | |
772 | case WLAN_CIPHER_SUITE_TKIP: | |
773 | key->u.tkip.tx.iv32 = seq->tkip.iv32; | |
774 | key->u.tkip.tx.iv16 = seq->tkip.iv16; | |
775 | break; | |
776 | case WLAN_CIPHER_SUITE_CCMP: | |
777 | pn64 = (u64)seq->ccmp.pn[5] | | |
778 | ((u64)seq->ccmp.pn[4] << 8) | | |
779 | ((u64)seq->ccmp.pn[3] << 16) | | |
780 | ((u64)seq->ccmp.pn[2] << 24) | | |
781 | ((u64)seq->ccmp.pn[1] << 32) | | |
782 | ((u64)seq->ccmp.pn[0] << 40); | |
783 | atomic64_set(&key->u.ccmp.tx_pn, pn64); | |
784 | break; | |
785 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
786 | pn64 = (u64)seq->aes_cmac.pn[5] | | |
787 | ((u64)seq->aes_cmac.pn[4] << 8) | | |
788 | ((u64)seq->aes_cmac.pn[3] << 16) | | |
789 | ((u64)seq->aes_cmac.pn[2] << 24) | | |
790 | ((u64)seq->aes_cmac.pn[1] << 32) | | |
791 | ((u64)seq->aes_cmac.pn[0] << 40); | |
792 | atomic64_set(&key->u.aes_cmac.tx_pn, pn64); | |
793 | break; | |
794 | default: | |
795 | WARN_ON(1); | |
796 | break; | |
797 | } | |
798 | } | |
799 | EXPORT_SYMBOL_GPL(ieee80211_set_key_tx_seq); | |
800 | ||
801 | void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf, | |
802 | int tid, struct ieee80211_key_seq *seq) | |
803 | { | |
804 | struct ieee80211_key *key; | |
805 | u8 *pn; | |
806 | ||
807 | key = container_of(keyconf, struct ieee80211_key, conf); | |
808 | ||
809 | switch (key->conf.cipher) { | |
810 | case WLAN_CIPHER_SUITE_TKIP: | |
811 | if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) | |
812 | return; | |
813 | key->u.tkip.rx[tid].iv32 = seq->tkip.iv32; | |
814 | key->u.tkip.rx[tid].iv16 = seq->tkip.iv16; | |
815 | break; | |
816 | case WLAN_CIPHER_SUITE_CCMP: | |
817 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) | |
818 | return; | |
819 | if (tid < 0) | |
820 | pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; | |
821 | else | |
822 | pn = key->u.ccmp.rx_pn[tid]; | |
823 | memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN); | |
824 | break; | |
825 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
826 | if (WARN_ON(tid != 0)) | |
827 | return; | |
828 | pn = key->u.aes_cmac.rx_pn; | |
829 | memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN); | |
830 | break; | |
831 | default: | |
832 | WARN_ON(1); | |
833 | break; | |
834 | } | |
835 | } | |
836 | EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq); | |
837 | ||
838 | void ieee80211_remove_key(struct ieee80211_key_conf *keyconf) | |
839 | { | |
840 | struct ieee80211_key *key; | |
841 | ||
842 | key = container_of(keyconf, struct ieee80211_key, conf); | |
843 | ||
844 | assert_key_lock(key->local); | |
845 | ||
846 | /* | |
847 | * if key was uploaded, we assume the driver will/has remove(d) | |
848 | * it, so adjust bookkeeping accordingly | |
849 | */ | |
850 | if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { | |
851 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; | |
852 | ||
853 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || | |
854 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) || | |
855 | (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))) | |
856 | increment_tailroom_need_count(key->sdata); | |
857 | } | |
858 | ||
859 | ieee80211_key_free(key, false); | |
860 | } | |
861 | EXPORT_SYMBOL_GPL(ieee80211_remove_key); | |
862 | ||
863 | struct ieee80211_key_conf * | |
864 | ieee80211_gtk_rekey_add(struct ieee80211_vif *vif, | |
865 | struct ieee80211_key_conf *keyconf) | |
866 | { | |
867 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
868 | struct ieee80211_local *local = sdata->local; | |
869 | struct ieee80211_key *key; | |
870 | int err; | |
871 | ||
872 | if (WARN_ON(!local->wowlan)) | |
873 | return ERR_PTR(-EINVAL); | |
874 | ||
875 | if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) | |
876 | return ERR_PTR(-EINVAL); | |
877 | ||
878 | key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx, | |
879 | keyconf->keylen, keyconf->key, | |
880 | 0, NULL); | |
881 | if (IS_ERR(key)) | |
c5dc164d | 882 | return ERR_CAST(key); |
27b3eb9c JB |
883 | |
884 | if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED) | |
885 | key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT; | |
886 | ||
887 | err = ieee80211_key_link(key, sdata, NULL); | |
888 | if (err) | |
889 | return ERR_PTR(err); | |
890 | ||
891 | return &key->conf; | |
892 | } | |
893 | EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add); |