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Commit | Line | Data |
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1f5a7e47 JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
3b96766f | 5 | * Copyright 2007-2008 Johannes Berg <johannes@sipsolutions.net> |
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 | ||
e31b8213 | 96 | if (!key->local->ops->set_key) |
3ffc2a90 | 97 | goto out_unsupported; |
11a843b7 | 98 | |
ad0e2b5a JB |
99 | assert_key_lock(key->local); |
100 | ||
89c91cae | 101 | sta = key->sta; |
dc822b5d | 102 | |
e31b8213 JB |
103 | /* |
104 | * If this is a per-STA GTK, check if it | |
105 | * is supported; if not, return. | |
106 | */ | |
107 | if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) && | |
108 | !(key->local->hw.flags & IEEE80211_HW_SUPPORTS_PER_STA_GTK)) | |
109 | goto out_unsupported; | |
110 | ||
89c91cae JB |
111 | if (sta && !sta->uploaded) |
112 | goto out_unsupported; | |
113 | ||
dc822b5d | 114 | sdata = key->sdata; |
18890d4b HS |
115 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { |
116 | /* | |
117 | * The driver doesn't know anything about VLAN interfaces. | |
118 | * Hence, don't send GTKs for VLAN interfaces to the driver. | |
119 | */ | |
120 | if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) | |
121 | goto out_unsupported; | |
18890d4b | 122 | } |
11a843b7 | 123 | |
89c91cae JB |
124 | ret = drv_set_key(key->local, SET_KEY, sdata, |
125 | sta ? &sta->sta : NULL, &key->conf); | |
11a843b7 | 126 | |
e31b8213 | 127 | if (!ret) { |
11a843b7 | 128 | key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; |
3bff1865 YAP |
129 | |
130 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || | |
077a9154 AN |
131 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) || |
132 | (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))) | |
3bff1865 YAP |
133 | sdata->crypto_tx_tailroom_needed_cnt--; |
134 | ||
077a9154 AN |
135 | WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && |
136 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)); | |
137 | ||
e31b8213 JB |
138 | return 0; |
139 | } | |
11a843b7 | 140 | |
e31b8213 | 141 | if (ret != -ENOSPC && ret != -EOPNOTSUPP) |
bdcbd8e0 | 142 | sdata_err(sdata, |
0fb9a9ec | 143 | "failed to set key (%d, %pM) to hardware (%d)\n", |
89c91cae JB |
144 | key->conf.keyidx, |
145 | sta ? sta->sta.addr : bcast_addr, ret); | |
3ffc2a90 | 146 | |
e31b8213 JB |
147 | out_unsupported: |
148 | switch (key->conf.cipher) { | |
149 | case WLAN_CIPHER_SUITE_WEP40: | |
150 | case WLAN_CIPHER_SUITE_WEP104: | |
151 | case WLAN_CIPHER_SUITE_TKIP: | |
152 | case WLAN_CIPHER_SUITE_CCMP: | |
153 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
154 | /* all of these we can do in software */ | |
155 | return 0; | |
156 | default: | |
157 | return -EINVAL; | |
3ffc2a90 | 158 | } |
11a843b7 JB |
159 | } |
160 | ||
161 | static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key) | |
162 | { | |
dc822b5d | 163 | struct ieee80211_sub_if_data *sdata; |
89c91cae | 164 | struct sta_info *sta; |
11a843b7 JB |
165 | int ret; |
166 | ||
3b96766f JB |
167 | might_sleep(); |
168 | ||
db4d1169 | 169 | if (!key || !key->local->ops->set_key) |
11a843b7 JB |
170 | return; |
171 | ||
ad0e2b5a JB |
172 | assert_key_lock(key->local); |
173 | ||
174 | if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) | |
11a843b7 JB |
175 | return; |
176 | ||
89c91cae | 177 | sta = key->sta; |
dc822b5d JB |
178 | sdata = key->sdata; |
179 | ||
3bff1865 | 180 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
077a9154 AN |
181 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) || |
182 | (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))) | |
3bff1865 YAP |
183 | increment_tailroom_need_count(sdata); |
184 | ||
12375ef9 | 185 | ret = drv_set_key(key->local, DISABLE_KEY, sdata, |
89c91cae | 186 | sta ? &sta->sta : NULL, &key->conf); |
11a843b7 JB |
187 | |
188 | if (ret) | |
bdcbd8e0 | 189 | sdata_err(sdata, |
0fb9a9ec | 190 | "failed to remove key (%d, %pM) from hardware (%d)\n", |
89c91cae JB |
191 | key->conf.keyidx, |
192 | sta ? sta->sta.addr : bcast_addr, ret); | |
11a843b7 | 193 | |
3b96766f | 194 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; |
3b96766f JB |
195 | } |
196 | ||
197 | static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, | |
f7e0104c | 198 | int idx, bool uni, bool multi) |
3b96766f JB |
199 | { |
200 | struct ieee80211_key *key = NULL; | |
201 | ||
ad0e2b5a JB |
202 | assert_key_lock(sdata->local); |
203 | ||
3b96766f | 204 | if (idx >= 0 && idx < NUM_DEFAULT_KEYS) |
40b275b6 | 205 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
3b96766f | 206 | |
de5fad81 | 207 | if (uni) { |
f7e0104c | 208 | rcu_assign_pointer(sdata->default_unicast_key, key); |
de5fad81 YD |
209 | drv_set_default_unicast_key(sdata->local, sdata, idx); |
210 | } | |
211 | ||
f7e0104c JB |
212 | if (multi) |
213 | rcu_assign_pointer(sdata->default_multicast_key, key); | |
3b96766f | 214 | |
f7e0104c | 215 | ieee80211_debugfs_key_update_default(sdata); |
3b96766f JB |
216 | } |
217 | ||
f7e0104c JB |
218 | void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx, |
219 | bool uni, bool multi) | |
3b96766f | 220 | { |
ad0e2b5a | 221 | mutex_lock(&sdata->local->key_mtx); |
f7e0104c | 222 | __ieee80211_set_default_key(sdata, idx, uni, multi); |
ad0e2b5a | 223 | mutex_unlock(&sdata->local->key_mtx); |
3b96766f JB |
224 | } |
225 | ||
3cfcf6ac JM |
226 | static void |
227 | __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx) | |
228 | { | |
229 | struct ieee80211_key *key = NULL; | |
230 | ||
ad0e2b5a JB |
231 | assert_key_lock(sdata->local); |
232 | ||
3cfcf6ac JM |
233 | if (idx >= NUM_DEFAULT_KEYS && |
234 | idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
40b275b6 | 235 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
3cfcf6ac JM |
236 | |
237 | rcu_assign_pointer(sdata->default_mgmt_key, key); | |
238 | ||
f7e0104c | 239 | ieee80211_debugfs_key_update_default(sdata); |
3cfcf6ac JM |
240 | } |
241 | ||
242 | void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, | |
243 | int idx) | |
244 | { | |
ad0e2b5a | 245 | mutex_lock(&sdata->local->key_mtx); |
3cfcf6ac | 246 | __ieee80211_set_default_mgmt_key(sdata, idx); |
ad0e2b5a | 247 | mutex_unlock(&sdata->local->key_mtx); |
3cfcf6ac JM |
248 | } |
249 | ||
3b96766f | 250 | |
3b8d9c29 JB |
251 | static void ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, |
252 | struct sta_info *sta, | |
253 | bool pairwise, | |
254 | struct ieee80211_key *old, | |
255 | struct ieee80211_key *new) | |
3b96766f | 256 | { |
f7e0104c JB |
257 | int idx; |
258 | bool defunikey, defmultikey, defmgmtkey; | |
3b96766f JB |
259 | |
260 | if (new) | |
f850e00f | 261 | list_add_tail(&new->list, &sdata->key_list); |
3b96766f | 262 | |
e31b8213 JB |
263 | if (sta && pairwise) { |
264 | rcu_assign_pointer(sta->ptk, new); | |
265 | } else if (sta) { | |
266 | if (old) | |
267 | idx = old->conf.keyidx; | |
268 | else | |
269 | idx = new->conf.keyidx; | |
270 | rcu_assign_pointer(sta->gtk[idx], new); | |
3b96766f JB |
271 | } else { |
272 | WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx); | |
273 | ||
274 | if (old) | |
275 | idx = old->conf.keyidx; | |
276 | else | |
277 | idx = new->conf.keyidx; | |
278 | ||
40b275b6 JB |
279 | defunikey = old && |
280 | old == key_mtx_dereference(sdata->local, | |
281 | sdata->default_unicast_key); | |
282 | defmultikey = old && | |
283 | old == key_mtx_dereference(sdata->local, | |
284 | sdata->default_multicast_key); | |
285 | defmgmtkey = old && | |
286 | old == key_mtx_dereference(sdata->local, | |
287 | sdata->default_mgmt_key); | |
3b96766f | 288 | |
f7e0104c JB |
289 | if (defunikey && !new) |
290 | __ieee80211_set_default_key(sdata, -1, true, false); | |
291 | if (defmultikey && !new) | |
292 | __ieee80211_set_default_key(sdata, -1, false, true); | |
3cfcf6ac JM |
293 | if (defmgmtkey && !new) |
294 | __ieee80211_set_default_mgmt_key(sdata, -1); | |
3b96766f JB |
295 | |
296 | rcu_assign_pointer(sdata->keys[idx], new); | |
f7e0104c JB |
297 | if (defunikey && new) |
298 | __ieee80211_set_default_key(sdata, new->conf.keyidx, | |
299 | true, false); | |
300 | if (defmultikey && new) | |
301 | __ieee80211_set_default_key(sdata, new->conf.keyidx, | |
302 | false, true); | |
3cfcf6ac JM |
303 | if (defmgmtkey && new) |
304 | __ieee80211_set_default_mgmt_key(sdata, | |
305 | new->conf.keyidx); | |
3b96766f JB |
306 | } |
307 | ||
b5c34f66 JB |
308 | if (old) |
309 | list_del(&old->list); | |
11a843b7 JB |
310 | } |
311 | ||
97359d12 | 312 | struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, |
faa8fdc8 JM |
313 | const u8 *key_data, |
314 | size_t seq_len, const u8 *seq) | |
1f5a7e47 JB |
315 | { |
316 | struct ieee80211_key *key; | |
1ac62ba7 | 317 | int i, j, err; |
1f5a7e47 | 318 | |
3cfcf6ac | 319 | BUG_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS); |
11a843b7 JB |
320 | |
321 | key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); | |
1f5a7e47 | 322 | if (!key) |
1ac62ba7 | 323 | return ERR_PTR(-ENOMEM); |
11a843b7 JB |
324 | |
325 | /* | |
326 | * Default to software encryption; we'll later upload the | |
327 | * key to the hardware if possible. | |
328 | */ | |
11a843b7 JB |
329 | key->conf.flags = 0; |
330 | key->flags = 0; | |
331 | ||
97359d12 | 332 | key->conf.cipher = cipher; |
11a843b7 JB |
333 | key->conf.keyidx = idx; |
334 | key->conf.keylen = key_len; | |
97359d12 JB |
335 | switch (cipher) { |
336 | case WLAN_CIPHER_SUITE_WEP40: | |
337 | case WLAN_CIPHER_SUITE_WEP104: | |
4325f6ca JB |
338 | key->conf.iv_len = IEEE80211_WEP_IV_LEN; |
339 | key->conf.icv_len = IEEE80211_WEP_ICV_LEN; | |
76708dee | 340 | break; |
97359d12 | 341 | case WLAN_CIPHER_SUITE_TKIP: |
4325f6ca JB |
342 | key->conf.iv_len = IEEE80211_TKIP_IV_LEN; |
343 | key->conf.icv_len = IEEE80211_TKIP_ICV_LEN; | |
9f26a952 | 344 | if (seq) { |
5a306f58 | 345 | for (i = 0; i < IEEE80211_NUM_TIDS; i++) { |
faa8fdc8 JM |
346 | key->u.tkip.rx[i].iv32 = |
347 | get_unaligned_le32(&seq[2]); | |
348 | key->u.tkip.rx[i].iv16 = | |
349 | get_unaligned_le16(seq); | |
350 | } | |
351 | } | |
523b02ea | 352 | spin_lock_init(&key->u.tkip.txlock); |
76708dee | 353 | break; |
97359d12 | 354 | case WLAN_CIPHER_SUITE_CCMP: |
4325f6ca JB |
355 | key->conf.iv_len = IEEE80211_CCMP_HDR_LEN; |
356 | key->conf.icv_len = IEEE80211_CCMP_MIC_LEN; | |
9f26a952 | 357 | if (seq) { |
5a306f58 | 358 | for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) |
4325f6ca | 359 | for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++) |
faa8fdc8 | 360 | key->u.ccmp.rx_pn[i][j] = |
4325f6ca | 361 | seq[IEEE80211_CCMP_PN_LEN - j - 1]; |
faa8fdc8 | 362 | } |
11a843b7 JB |
363 | /* |
364 | * Initialize AES key state here as an optimization so that | |
365 | * it does not need to be initialized for every packet. | |
366 | */ | |
367 | key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(key_data); | |
1ac62ba7 BH |
368 | if (IS_ERR(key->u.ccmp.tfm)) { |
369 | err = PTR_ERR(key->u.ccmp.tfm); | |
3b96766f | 370 | kfree(key); |
1f951a7f | 371 | return ERR_PTR(err); |
11a843b7 | 372 | } |
60ae0f20 JB |
373 | break; |
374 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
375 | key->conf.iv_len = 0; | |
376 | key->conf.icv_len = sizeof(struct ieee80211_mmie); | |
377 | if (seq) | |
4325f6ca | 378 | for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++) |
0f927323 | 379 | key->u.aes_cmac.rx_pn[j] = |
4325f6ca | 380 | seq[IEEE80211_CMAC_PN_LEN - j - 1]; |
3cfcf6ac JM |
381 | /* |
382 | * Initialize AES key state here as an optimization so that | |
383 | * it does not need to be initialized for every packet. | |
384 | */ | |
385 | key->u.aes_cmac.tfm = | |
386 | ieee80211_aes_cmac_key_setup(key_data); | |
1ac62ba7 BH |
387 | if (IS_ERR(key->u.aes_cmac.tfm)) { |
388 | err = PTR_ERR(key->u.aes_cmac.tfm); | |
3cfcf6ac | 389 | kfree(key); |
1f951a7f | 390 | return ERR_PTR(err); |
3cfcf6ac | 391 | } |
60ae0f20 | 392 | break; |
3cfcf6ac | 393 | } |
60ae0f20 JB |
394 | memcpy(key->conf.key, key_data, key_len); |
395 | INIT_LIST_HEAD(&key->list); | |
3cfcf6ac | 396 | |
db4d1169 JB |
397 | return key; |
398 | } | |
11a843b7 | 399 | |
79cf2dfa JB |
400 | static void ieee80211_key_free_common(struct ieee80211_key *key) |
401 | { | |
402 | if (key->conf.cipher == WLAN_CIPHER_SUITE_CCMP) | |
403 | ieee80211_aes_key_free(key->u.ccmp.tfm); | |
404 | if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC) | |
405 | ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); | |
406 | kfree(key); | |
407 | } | |
408 | ||
6d10e46b JB |
409 | static void __ieee80211_key_destroy(struct ieee80211_key *key, |
410 | bool delay_tailroom) | |
ad0e2b5a | 411 | { |
32162a4d JM |
412 | if (key->local) |
413 | ieee80211_key_disable_hw_accel(key); | |
ad0e2b5a | 414 | |
3bff1865 | 415 | if (key->local) { |
8d1f7ecd JB |
416 | struct ieee80211_sub_if_data *sdata = key->sdata; |
417 | ||
32162a4d | 418 | ieee80211_debugfs_key_remove(key); |
8d1f7ecd JB |
419 | |
420 | if (delay_tailroom) { | |
421 | /* see ieee80211_delayed_tailroom_dec */ | |
422 | sdata->crypto_tx_tailroom_pending_dec++; | |
423 | schedule_delayed_work(&sdata->dec_tailroom_needed_wk, | |
424 | HZ/2); | |
425 | } else { | |
426 | sdata->crypto_tx_tailroom_needed_cnt--; | |
427 | } | |
3bff1865 | 428 | } |
ad0e2b5a | 429 | |
79cf2dfa JB |
430 | ieee80211_key_free_common(key); |
431 | } | |
432 | ||
6d10e46b JB |
433 | static void ieee80211_key_destroy(struct ieee80211_key *key, |
434 | bool delay_tailroom) | |
435 | { | |
436 | if (!key) | |
437 | return; | |
438 | ||
439 | /* | |
440 | * Synchronize so the TX path can no longer be using | |
441 | * this key before we free/remove it. | |
442 | */ | |
443 | synchronize_net(); | |
444 | ||
445 | __ieee80211_key_destroy(key, delay_tailroom); | |
446 | } | |
447 | ||
79cf2dfa JB |
448 | void ieee80211_key_free_unused(struct ieee80211_key *key) |
449 | { | |
450 | WARN_ON(key->sdata || key->local); | |
451 | ieee80211_key_free_common(key); | |
ad0e2b5a JB |
452 | } |
453 | ||
3ffc2a90 JB |
454 | int ieee80211_key_link(struct ieee80211_key *key, |
455 | struct ieee80211_sub_if_data *sdata, | |
456 | struct sta_info *sta) | |
db4d1169 JB |
457 | { |
458 | struct ieee80211_key *old_key; | |
3ffc2a90 | 459 | int idx, ret; |
67aa030c | 460 | bool pairwise; |
db4d1169 | 461 | |
db4d1169 JB |
462 | BUG_ON(!sdata); |
463 | BUG_ON(!key); | |
464 | ||
67aa030c | 465 | pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE; |
db4d1169 JB |
466 | idx = key->conf.keyidx; |
467 | key->local = sdata->local; | |
468 | key->sdata = sdata; | |
469 | key->sta = sta; | |
470 | ||
ad0e2b5a | 471 | mutex_lock(&sdata->local->key_mtx); |
3b96766f | 472 | |
e31b8213 | 473 | if (sta && pairwise) |
40b275b6 | 474 | old_key = key_mtx_dereference(sdata->local, sta->ptk); |
e31b8213 | 475 | else if (sta) |
40b275b6 | 476 | old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]); |
d4e46a3d | 477 | else |
40b275b6 | 478 | old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
db4d1169 | 479 | |
3bff1865 YAP |
480 | increment_tailroom_need_count(sdata); |
481 | ||
3b8d9c29 JB |
482 | ieee80211_key_replace(sdata, sta, pairwise, old_key, key); |
483 | ieee80211_key_destroy(old_key, true); | |
d4e46a3d | 484 | |
ad0e2b5a | 485 | ieee80211_debugfs_key_add(key); |
db4d1169 | 486 | |
3ffc2a90 | 487 | ret = ieee80211_key_enable_hw_accel(key); |
523d2f69 | 488 | |
79cf2dfa | 489 | if (ret) |
3b8d9c29 | 490 | ieee80211_key_free(key, true); |
79cf2dfa | 491 | |
ad0e2b5a | 492 | mutex_unlock(&sdata->local->key_mtx); |
3ffc2a90 JB |
493 | |
494 | return ret; | |
1f5a7e47 JB |
495 | } |
496 | ||
3b8d9c29 | 497 | void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom) |
1f5a7e47 | 498 | { |
5c0c3641 JB |
499 | if (!key) |
500 | return; | |
501 | ||
3b96766f JB |
502 | /* |
503 | * Replace key with nothingness if it was ever used. | |
504 | */ | |
3a245766 | 505 | if (key->sdata) |
3b8d9c29 | 506 | ieee80211_key_replace(key->sdata, key->sta, |
e31b8213 JB |
507 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, |
508 | key, NULL); | |
3b8d9c29 | 509 | ieee80211_key_destroy(key, delay_tailroom); |
3b96766f | 510 | } |
d4e46a3d | 511 | |
ad0e2b5a | 512 | void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata) |
3a245766 JB |
513 | { |
514 | struct ieee80211_key *key; | |
11a843b7 | 515 | |
3a245766 | 516 | ASSERT_RTNL(); |
11a843b7 | 517 | |
9607e6b6 | 518 | if (WARN_ON(!ieee80211_sdata_running(sdata))) |
3a245766 | 519 | return; |
11a843b7 | 520 | |
ad0e2b5a | 521 | mutex_lock(&sdata->local->key_mtx); |
11a843b7 | 522 | |
3bff1865 YAP |
523 | sdata->crypto_tx_tailroom_needed_cnt = 0; |
524 | ||
525 | list_for_each_entry(key, &sdata->key_list, list) { | |
526 | increment_tailroom_need_count(sdata); | |
ad0e2b5a | 527 | ieee80211_key_enable_hw_accel(key); |
3bff1865 | 528 | } |
3b96766f | 529 | |
ad0e2b5a | 530 | mutex_unlock(&sdata->local->key_mtx); |
11a843b7 JB |
531 | } |
532 | ||
830af02f JB |
533 | void ieee80211_iter_keys(struct ieee80211_hw *hw, |
534 | struct ieee80211_vif *vif, | |
535 | void (*iter)(struct ieee80211_hw *hw, | |
536 | struct ieee80211_vif *vif, | |
537 | struct ieee80211_sta *sta, | |
538 | struct ieee80211_key_conf *key, | |
539 | void *data), | |
540 | void *iter_data) | |
541 | { | |
542 | struct ieee80211_local *local = hw_to_local(hw); | |
543 | struct ieee80211_key *key; | |
544 | struct ieee80211_sub_if_data *sdata; | |
545 | ||
546 | ASSERT_RTNL(); | |
547 | ||
548 | mutex_lock(&local->key_mtx); | |
549 | if (vif) { | |
550 | sdata = vif_to_sdata(vif); | |
551 | list_for_each_entry(key, &sdata->key_list, list) | |
552 | iter(hw, &sdata->vif, | |
553 | key->sta ? &key->sta->sta : NULL, | |
554 | &key->conf, iter_data); | |
555 | } else { | |
556 | list_for_each_entry(sdata, &local->interfaces, list) | |
557 | list_for_each_entry(key, &sdata->key_list, list) | |
558 | iter(hw, &sdata->vif, | |
559 | key->sta ? &key->sta->sta : NULL, | |
560 | &key->conf, iter_data); | |
561 | } | |
562 | mutex_unlock(&local->key_mtx); | |
563 | } | |
564 | EXPORT_SYMBOL(ieee80211_iter_keys); | |
565 | ||
3b96766f JB |
566 | void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata) |
567 | { | |
568 | struct ieee80211_key *key, *tmp; | |
6d10e46b | 569 | LIST_HEAD(keys); |
db4d1169 | 570 | |
8d1f7ecd JB |
571 | cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk); |
572 | ||
ad0e2b5a | 573 | mutex_lock(&sdata->local->key_mtx); |
3b96766f | 574 | |
8d1f7ecd JB |
575 | sdata->crypto_tx_tailroom_needed_cnt -= |
576 | sdata->crypto_tx_tailroom_pending_dec; | |
577 | sdata->crypto_tx_tailroom_pending_dec = 0; | |
578 | ||
3cfcf6ac | 579 | ieee80211_debugfs_key_remove_mgmt_default(sdata); |
3b96766f | 580 | |
6d10e46b JB |
581 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) { |
582 | ieee80211_key_replace(key->sdata, key->sta, | |
583 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
584 | key, NULL); | |
585 | list_add_tail(&key->list, &keys); | |
586 | } | |
3b96766f | 587 | |
f7e0104c JB |
588 | ieee80211_debugfs_key_update_default(sdata); |
589 | ||
6d10e46b JB |
590 | if (!list_empty(&keys)) { |
591 | synchronize_net(); | |
592 | list_for_each_entry_safe(key, tmp, &keys, list) | |
593 | __ieee80211_key_destroy(key, false); | |
594 | } | |
595 | ||
8d1f7ecd JB |
596 | WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt || |
597 | sdata->crypto_tx_tailroom_pending_dec); | |
598 | ||
ad0e2b5a | 599 | mutex_unlock(&sdata->local->key_mtx); |
11a843b7 | 600 | } |
c68f4b89 | 601 | |
6d10e46b JB |
602 | void ieee80211_free_sta_keys(struct ieee80211_local *local, |
603 | struct sta_info *sta) | |
604 | { | |
605 | struct ieee80211_key *key, *tmp; | |
606 | LIST_HEAD(keys); | |
607 | int i; | |
608 | ||
609 | mutex_lock(&local->key_mtx); | |
610 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) { | |
611 | key = key_mtx_dereference(local, sta->gtk[i]); | |
612 | if (!key) | |
613 | continue; | |
614 | ieee80211_key_replace(key->sdata, key->sta, | |
615 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, | |
616 | key, NULL); | |
617 | list_add(&key->list, &keys); | |
618 | } | |
619 | ||
620 | key = key_mtx_dereference(local, sta->ptk); | |
621 | if (key) { | |
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 | /* | |
629 | * NB: the station code relies on this being | |
630 | * done even if there aren't any keys | |
631 | */ | |
632 | synchronize_net(); | |
633 | ||
634 | list_for_each_entry_safe(key, tmp, &keys, list) | |
635 | __ieee80211_key_destroy(key, true); | |
636 | ||
637 | mutex_unlock(&local->key_mtx); | |
638 | } | |
639 | ||
8d1f7ecd JB |
640 | void ieee80211_delayed_tailroom_dec(struct work_struct *wk) |
641 | { | |
642 | struct ieee80211_sub_if_data *sdata; | |
643 | ||
644 | sdata = container_of(wk, struct ieee80211_sub_if_data, | |
645 | dec_tailroom_needed_wk.work); | |
646 | ||
647 | /* | |
648 | * The reason for the delayed tailroom needed decrementing is to | |
649 | * make roaming faster: during roaming, all keys are first deleted | |
650 | * and then new keys are installed. The first new key causes the | |
651 | * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes | |
652 | * the cost of synchronize_net() (which can be slow). Avoid this | |
653 | * by deferring the crypto_tx_tailroom_needed_cnt decrementing on | |
654 | * key removal for a while, so if we roam the value is larger than | |
655 | * zero and no 0->1 transition happens. | |
656 | * | |
657 | * The cost is that if the AP switching was from an AP with keys | |
658 | * to one without, we still allocate tailroom while it would no | |
659 | * longer be needed. However, in the typical (fast) roaming case | |
660 | * within an ESS this usually won't happen. | |
661 | */ | |
662 | ||
663 | mutex_lock(&sdata->local->key_mtx); | |
664 | sdata->crypto_tx_tailroom_needed_cnt -= | |
665 | sdata->crypto_tx_tailroom_pending_dec; | |
666 | sdata->crypto_tx_tailroom_pending_dec = 0; | |
667 | mutex_unlock(&sdata->local->key_mtx); | |
668 | } | |
c68f4b89 JB |
669 | |
670 | void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid, | |
671 | const u8 *replay_ctr, gfp_t gfp) | |
672 | { | |
673 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
674 | ||
675 | trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr); | |
676 | ||
677 | cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp); | |
678 | } | |
679 | EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify); | |
3ea542d3 JB |
680 | |
681 | void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf, | |
682 | struct ieee80211_key_seq *seq) | |
683 | { | |
684 | struct ieee80211_key *key; | |
685 | u64 pn64; | |
686 | ||
687 | if (WARN_ON(!(keyconf->flags & IEEE80211_KEY_FLAG_GENERATE_IV))) | |
688 | return; | |
689 | ||
690 | key = container_of(keyconf, struct ieee80211_key, conf); | |
691 | ||
692 | switch (key->conf.cipher) { | |
693 | case WLAN_CIPHER_SUITE_TKIP: | |
694 | seq->tkip.iv32 = key->u.tkip.tx.iv32; | |
695 | seq->tkip.iv16 = key->u.tkip.tx.iv16; | |
696 | break; | |
697 | case WLAN_CIPHER_SUITE_CCMP: | |
698 | pn64 = atomic64_read(&key->u.ccmp.tx_pn); | |
699 | seq->ccmp.pn[5] = pn64; | |
700 | seq->ccmp.pn[4] = pn64 >> 8; | |
701 | seq->ccmp.pn[3] = pn64 >> 16; | |
702 | seq->ccmp.pn[2] = pn64 >> 24; | |
703 | seq->ccmp.pn[1] = pn64 >> 32; | |
704 | seq->ccmp.pn[0] = pn64 >> 40; | |
705 | break; | |
706 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
707 | pn64 = atomic64_read(&key->u.aes_cmac.tx_pn); | |
708 | seq->ccmp.pn[5] = pn64; | |
709 | seq->ccmp.pn[4] = pn64 >> 8; | |
710 | seq->ccmp.pn[3] = pn64 >> 16; | |
711 | seq->ccmp.pn[2] = pn64 >> 24; | |
712 | seq->ccmp.pn[1] = pn64 >> 32; | |
713 | seq->ccmp.pn[0] = pn64 >> 40; | |
714 | break; | |
715 | default: | |
716 | WARN_ON(1); | |
717 | } | |
718 | } | |
719 | EXPORT_SYMBOL(ieee80211_get_key_tx_seq); | |
720 | ||
721 | void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf, | |
722 | int tid, struct ieee80211_key_seq *seq) | |
723 | { | |
724 | struct ieee80211_key *key; | |
725 | const u8 *pn; | |
726 | ||
727 | key = container_of(keyconf, struct ieee80211_key, conf); | |
728 | ||
729 | switch (key->conf.cipher) { | |
730 | case WLAN_CIPHER_SUITE_TKIP: | |
5a306f58 | 731 | if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS)) |
3ea542d3 JB |
732 | return; |
733 | seq->tkip.iv32 = key->u.tkip.rx[tid].iv32; | |
734 | seq->tkip.iv16 = key->u.tkip.rx[tid].iv16; | |
735 | break; | |
736 | case WLAN_CIPHER_SUITE_CCMP: | |
5a306f58 | 737 | if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS)) |
3ea542d3 JB |
738 | return; |
739 | if (tid < 0) | |
5a306f58 | 740 | pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS]; |
3ea542d3 JB |
741 | else |
742 | pn = key->u.ccmp.rx_pn[tid]; | |
4325f6ca | 743 | memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN); |
3ea542d3 JB |
744 | break; |
745 | case WLAN_CIPHER_SUITE_AES_CMAC: | |
746 | if (WARN_ON(tid != 0)) | |
747 | return; | |
748 | pn = key->u.aes_cmac.rx_pn; | |
4325f6ca | 749 | memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN); |
3ea542d3 JB |
750 | break; |
751 | } | |
752 | } | |
753 | EXPORT_SYMBOL(ieee80211_get_key_rx_seq); |