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5d637d5a PB |
1 | /* |
2 | * Copyright (C) 2014 Fraunhofer ITWM | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 | |
6 | * as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * Written by: | |
14 | * Phoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de> | |
15 | */ | |
16 | ||
17 | #include <linux/err.h> | |
18 | #include <linux/bug.h> | |
19 | #include <linux/completion.h> | |
4ca24aca | 20 | #include <linux/ieee802154.h> |
8a1a2b71 | 21 | #include <crypto/aead.h> |
96953718 | 22 | #include <crypto/skcipher.h> |
5d637d5a | 23 | |
0f1556bc | 24 | #include "ieee802154_i.h" |
5d637d5a PB |
25 | #include "llsec.h" |
26 | ||
27 | static void llsec_key_put(struct mac802154_llsec_key *key); | |
28 | static bool llsec_key_id_equal(const struct ieee802154_llsec_key_id *a, | |
29 | const struct ieee802154_llsec_key_id *b); | |
30 | ||
31 | static void llsec_dev_free(struct mac802154_llsec_device *dev); | |
32 | ||
33 | void mac802154_llsec_init(struct mac802154_llsec *sec) | |
34 | { | |
35 | memset(sec, 0, sizeof(*sec)); | |
36 | ||
37 | memset(&sec->params.default_key_source, 0xFF, IEEE802154_ADDR_LEN); | |
38 | ||
39 | INIT_LIST_HEAD(&sec->table.security_levels); | |
40 | INIT_LIST_HEAD(&sec->table.devices); | |
41 | INIT_LIST_HEAD(&sec->table.keys); | |
42 | hash_init(sec->devices_short); | |
43 | hash_init(sec->devices_hw); | |
44 | rwlock_init(&sec->lock); | |
45 | } | |
46 | ||
47 | void mac802154_llsec_destroy(struct mac802154_llsec *sec) | |
48 | { | |
49 | struct ieee802154_llsec_seclevel *sl, *sn; | |
50 | struct ieee802154_llsec_device *dev, *dn; | |
51 | struct ieee802154_llsec_key_entry *key, *kn; | |
52 | ||
53 | list_for_each_entry_safe(sl, sn, &sec->table.security_levels, list) { | |
54 | struct mac802154_llsec_seclevel *msl; | |
55 | ||
56 | msl = container_of(sl, struct mac802154_llsec_seclevel, level); | |
57 | list_del(&sl->list); | |
71cd2aa5 | 58 | kzfree(msl); |
5d637d5a PB |
59 | } |
60 | ||
61 | list_for_each_entry_safe(dev, dn, &sec->table.devices, list) { | |
62 | struct mac802154_llsec_device *mdev; | |
63 | ||
64 | mdev = container_of(dev, struct mac802154_llsec_device, dev); | |
65 | list_del(&dev->list); | |
66 | llsec_dev_free(mdev); | |
67 | } | |
68 | ||
69 | list_for_each_entry_safe(key, kn, &sec->table.keys, list) { | |
70 | struct mac802154_llsec_key *mkey; | |
71 | ||
72 | mkey = container_of(key->key, struct mac802154_llsec_key, key); | |
73 | list_del(&key->list); | |
74 | llsec_key_put(mkey); | |
71cd2aa5 | 75 | kzfree(key); |
5d637d5a PB |
76 | } |
77 | } | |
78 | ||
5d637d5a PB |
79 | int mac802154_llsec_get_params(struct mac802154_llsec *sec, |
80 | struct ieee802154_llsec_params *params) | |
81 | { | |
82 | read_lock_bh(&sec->lock); | |
83 | *params = sec->params; | |
84 | read_unlock_bh(&sec->lock); | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
89 | int mac802154_llsec_set_params(struct mac802154_llsec *sec, | |
90 | const struct ieee802154_llsec_params *params, | |
91 | int changed) | |
92 | { | |
93 | write_lock_bh(&sec->lock); | |
94 | ||
95 | if (changed & IEEE802154_LLSEC_PARAM_ENABLED) | |
96 | sec->params.enabled = params->enabled; | |
97 | if (changed & IEEE802154_LLSEC_PARAM_FRAME_COUNTER) | |
98 | sec->params.frame_counter = params->frame_counter; | |
99 | if (changed & IEEE802154_LLSEC_PARAM_OUT_LEVEL) | |
100 | sec->params.out_level = params->out_level; | |
101 | if (changed & IEEE802154_LLSEC_PARAM_OUT_KEY) | |
102 | sec->params.out_key = params->out_key; | |
103 | if (changed & IEEE802154_LLSEC_PARAM_KEY_SOURCE) | |
104 | sec->params.default_key_source = params->default_key_source; | |
105 | if (changed & IEEE802154_LLSEC_PARAM_PAN_ID) | |
106 | sec->params.pan_id = params->pan_id; | |
107 | if (changed & IEEE802154_LLSEC_PARAM_HWADDR) | |
108 | sec->params.hwaddr = params->hwaddr; | |
109 | if (changed & IEEE802154_LLSEC_PARAM_COORD_HWADDR) | |
110 | sec->params.coord_hwaddr = params->coord_hwaddr; | |
111 | if (changed & IEEE802154_LLSEC_PARAM_COORD_SHORTADDR) | |
112 | sec->params.coord_shortaddr = params->coord_shortaddr; | |
113 | ||
114 | write_unlock_bh(&sec->lock); | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
5d637d5a PB |
119 | static struct mac802154_llsec_key* |
120 | llsec_key_alloc(const struct ieee802154_llsec_key *template) | |
121 | { | |
122 | const int authsizes[3] = { 4, 8, 16 }; | |
123 | struct mac802154_llsec_key *key; | |
124 | int i; | |
125 | ||
126 | key = kzalloc(sizeof(*key), GFP_KERNEL); | |
127 | if (!key) | |
128 | return NULL; | |
129 | ||
130 | kref_init(&key->ref); | |
131 | key->key = *template; | |
132 | ||
133 | BUILD_BUG_ON(ARRAY_SIZE(authsizes) != ARRAY_SIZE(key->tfm)); | |
134 | ||
135 | for (i = 0; i < ARRAY_SIZE(key->tfm); i++) { | |
136 | key->tfm[i] = crypto_alloc_aead("ccm(aes)", 0, | |
137 | CRYPTO_ALG_ASYNC); | |
89eb6d06 | 138 | if (IS_ERR(key->tfm[i])) |
5d637d5a PB |
139 | goto err_tfm; |
140 | if (crypto_aead_setkey(key->tfm[i], template->key, | |
141 | IEEE802154_LLSEC_KEY_SIZE)) | |
142 | goto err_tfm; | |
143 | if (crypto_aead_setauthsize(key->tfm[i], authsizes[i])) | |
144 | goto err_tfm; | |
145 | } | |
146 | ||
96953718 | 147 | key->tfm0 = crypto_alloc_skcipher("ctr(aes)", 0, CRYPTO_ALG_ASYNC); |
89eb6d06 | 148 | if (IS_ERR(key->tfm0)) |
5d637d5a PB |
149 | goto err_tfm; |
150 | ||
96953718 HX |
151 | if (crypto_skcipher_setkey(key->tfm0, template->key, |
152 | IEEE802154_LLSEC_KEY_SIZE)) | |
5d637d5a PB |
153 | goto err_tfm0; |
154 | ||
155 | return key; | |
156 | ||
157 | err_tfm0: | |
96953718 | 158 | crypto_free_skcipher(key->tfm0); |
5d637d5a PB |
159 | err_tfm: |
160 | for (i = 0; i < ARRAY_SIZE(key->tfm); i++) | |
161 | if (key->tfm[i]) | |
162 | crypto_free_aead(key->tfm[i]); | |
163 | ||
71cd2aa5 | 164 | kzfree(key); |
5d637d5a PB |
165 | return NULL; |
166 | } | |
167 | ||
168 | static void llsec_key_release(struct kref *ref) | |
169 | { | |
170 | struct mac802154_llsec_key *key; | |
171 | int i; | |
172 | ||
173 | key = container_of(ref, struct mac802154_llsec_key, ref); | |
174 | ||
175 | for (i = 0; i < ARRAY_SIZE(key->tfm); i++) | |
176 | crypto_free_aead(key->tfm[i]); | |
177 | ||
96953718 | 178 | crypto_free_skcipher(key->tfm0); |
71cd2aa5 | 179 | kzfree(key); |
5d637d5a PB |
180 | } |
181 | ||
182 | static struct mac802154_llsec_key* | |
183 | llsec_key_get(struct mac802154_llsec_key *key) | |
184 | { | |
185 | kref_get(&key->ref); | |
186 | return key; | |
187 | } | |
188 | ||
189 | static void llsec_key_put(struct mac802154_llsec_key *key) | |
190 | { | |
191 | kref_put(&key->ref, llsec_key_release); | |
192 | } | |
193 | ||
194 | static bool llsec_key_id_equal(const struct ieee802154_llsec_key_id *a, | |
195 | const struct ieee802154_llsec_key_id *b) | |
196 | { | |
197 | if (a->mode != b->mode) | |
198 | return false; | |
199 | ||
200 | if (a->mode == IEEE802154_SCF_KEY_IMPLICIT) | |
201 | return ieee802154_addr_equal(&a->device_addr, &b->device_addr); | |
202 | ||
203 | if (a->id != b->id) | |
204 | return false; | |
205 | ||
206 | switch (a->mode) { | |
53819a6c PB |
207 | case IEEE802154_SCF_KEY_INDEX: |
208 | return true; | |
5d637d5a PB |
209 | case IEEE802154_SCF_KEY_SHORT_INDEX: |
210 | return a->short_source == b->short_source; | |
211 | case IEEE802154_SCF_KEY_HW_INDEX: | |
212 | return a->extended_source == b->extended_source; | |
213 | } | |
214 | ||
215 | return false; | |
216 | } | |
217 | ||
218 | int mac802154_llsec_key_add(struct mac802154_llsec *sec, | |
219 | const struct ieee802154_llsec_key_id *id, | |
220 | const struct ieee802154_llsec_key *key) | |
221 | { | |
222 | struct mac802154_llsec_key *mkey = NULL; | |
223 | struct ieee802154_llsec_key_entry *pos, *new; | |
224 | ||
225 | if (!(key->frame_types & (1 << IEEE802154_FC_TYPE_MAC_CMD)) && | |
226 | key->cmd_frame_ids) | |
227 | return -EINVAL; | |
228 | ||
229 | list_for_each_entry(pos, &sec->table.keys, list) { | |
230 | if (llsec_key_id_equal(&pos->id, id)) | |
231 | return -EEXIST; | |
232 | ||
233 | if (memcmp(pos->key->key, key->key, | |
234 | IEEE802154_LLSEC_KEY_SIZE)) | |
235 | continue; | |
236 | ||
237 | mkey = container_of(pos->key, struct mac802154_llsec_key, key); | |
238 | ||
239 | /* Don't allow multiple instances of the same AES key to have | |
240 | * different allowed frame types/command frame ids, as this is | |
241 | * not possible in the 802.15.4 PIB. | |
242 | */ | |
243 | if (pos->key->frame_types != key->frame_types || | |
244 | pos->key->cmd_frame_ids != key->cmd_frame_ids) | |
245 | return -EEXIST; | |
246 | ||
247 | break; | |
248 | } | |
249 | ||
250 | new = kzalloc(sizeof(*new), GFP_KERNEL); | |
251 | if (!new) | |
252 | return -ENOMEM; | |
253 | ||
254 | if (!mkey) | |
255 | mkey = llsec_key_alloc(key); | |
256 | else | |
257 | mkey = llsec_key_get(mkey); | |
258 | ||
259 | if (!mkey) | |
260 | goto fail; | |
261 | ||
262 | new->id = *id; | |
263 | new->key = &mkey->key; | |
264 | ||
265 | list_add_rcu(&new->list, &sec->table.keys); | |
266 | ||
267 | return 0; | |
268 | ||
269 | fail: | |
71cd2aa5 | 270 | kzfree(new); |
5d637d5a PB |
271 | return -ENOMEM; |
272 | } | |
273 | ||
274 | int mac802154_llsec_key_del(struct mac802154_llsec *sec, | |
275 | const struct ieee802154_llsec_key_id *key) | |
276 | { | |
277 | struct ieee802154_llsec_key_entry *pos; | |
278 | ||
279 | list_for_each_entry(pos, &sec->table.keys, list) { | |
280 | struct mac802154_llsec_key *mkey; | |
281 | ||
282 | mkey = container_of(pos->key, struct mac802154_llsec_key, key); | |
283 | ||
284 | if (llsec_key_id_equal(&pos->id, key)) { | |
fff1f59b | 285 | list_del_rcu(&pos->list); |
5d637d5a PB |
286 | llsec_key_put(mkey); |
287 | return 0; | |
288 | } | |
289 | } | |
290 | ||
291 | return -ENOENT; | |
292 | } | |
293 | ||
5d637d5a PB |
294 | static bool llsec_dev_use_shortaddr(__le16 short_addr) |
295 | { | |
296 | return short_addr != cpu_to_le16(IEEE802154_ADDR_UNDEF) && | |
297 | short_addr != cpu_to_le16(0xffff); | |
298 | } | |
299 | ||
300 | static u32 llsec_dev_hash_short(__le16 short_addr, __le16 pan_id) | |
301 | { | |
1db99604 | 302 | return ((__force u16)short_addr) << 16 | (__force u16)pan_id; |
5d637d5a PB |
303 | } |
304 | ||
305 | static u64 llsec_dev_hash_long(__le64 hwaddr) | |
306 | { | |
1db99604 | 307 | return (__force u64)hwaddr; |
5d637d5a PB |
308 | } |
309 | ||
310 | static struct mac802154_llsec_device* | |
311 | llsec_dev_find_short(struct mac802154_llsec *sec, __le16 short_addr, | |
312 | __le16 pan_id) | |
313 | { | |
314 | struct mac802154_llsec_device *dev; | |
315 | u32 key = llsec_dev_hash_short(short_addr, pan_id); | |
316 | ||
317 | hash_for_each_possible_rcu(sec->devices_short, dev, bucket_s, key) { | |
318 | if (dev->dev.short_addr == short_addr && | |
319 | dev->dev.pan_id == pan_id) | |
320 | return dev; | |
321 | } | |
322 | ||
323 | return NULL; | |
324 | } | |
325 | ||
326 | static struct mac802154_llsec_device* | |
327 | llsec_dev_find_long(struct mac802154_llsec *sec, __le64 hwaddr) | |
328 | { | |
329 | struct mac802154_llsec_device *dev; | |
330 | u64 key = llsec_dev_hash_long(hwaddr); | |
331 | ||
332 | hash_for_each_possible_rcu(sec->devices_hw, dev, bucket_hw, key) { | |
333 | if (dev->dev.hwaddr == hwaddr) | |
334 | return dev; | |
335 | } | |
336 | ||
337 | return NULL; | |
338 | } | |
339 | ||
340 | static void llsec_dev_free(struct mac802154_llsec_device *dev) | |
341 | { | |
342 | struct ieee802154_llsec_device_key *pos, *pn; | |
343 | struct mac802154_llsec_device_key *devkey; | |
344 | ||
345 | list_for_each_entry_safe(pos, pn, &dev->dev.keys, list) { | |
346 | devkey = container_of(pos, struct mac802154_llsec_device_key, | |
347 | devkey); | |
348 | ||
349 | list_del(&pos->list); | |
71cd2aa5 | 350 | kzfree(devkey); |
5d637d5a PB |
351 | } |
352 | ||
71cd2aa5 | 353 | kzfree(dev); |
5d637d5a PB |
354 | } |
355 | ||
356 | int mac802154_llsec_dev_add(struct mac802154_llsec *sec, | |
357 | const struct ieee802154_llsec_device *dev) | |
358 | { | |
359 | struct mac802154_llsec_device *entry; | |
360 | u32 skey = llsec_dev_hash_short(dev->short_addr, dev->pan_id); | |
361 | u64 hwkey = llsec_dev_hash_long(dev->hwaddr); | |
362 | ||
363 | BUILD_BUG_ON(sizeof(hwkey) != IEEE802154_ADDR_LEN); | |
364 | ||
365 | if ((llsec_dev_use_shortaddr(dev->short_addr) && | |
366 | llsec_dev_find_short(sec, dev->short_addr, dev->pan_id)) || | |
367 | llsec_dev_find_long(sec, dev->hwaddr)) | |
368 | return -EEXIST; | |
369 | ||
370 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); | |
371 | if (!entry) | |
372 | return -ENOMEM; | |
373 | ||
374 | entry->dev = *dev; | |
375 | spin_lock_init(&entry->lock); | |
376 | INIT_LIST_HEAD(&entry->dev.keys); | |
377 | ||
378 | if (llsec_dev_use_shortaddr(dev->short_addr)) | |
379 | hash_add_rcu(sec->devices_short, &entry->bucket_s, skey); | |
380 | else | |
381 | INIT_HLIST_NODE(&entry->bucket_s); | |
382 | ||
383 | hash_add_rcu(sec->devices_hw, &entry->bucket_hw, hwkey); | |
384 | list_add_tail_rcu(&entry->dev.list, &sec->table.devices); | |
385 | ||
386 | return 0; | |
387 | } | |
388 | ||
389 | static void llsec_dev_free_rcu(struct rcu_head *rcu) | |
390 | { | |
391 | llsec_dev_free(container_of(rcu, struct mac802154_llsec_device, rcu)); | |
392 | } | |
393 | ||
394 | int mac802154_llsec_dev_del(struct mac802154_llsec *sec, __le64 device_addr) | |
395 | { | |
396 | struct mac802154_llsec_device *pos; | |
397 | ||
398 | pos = llsec_dev_find_long(sec, device_addr); | |
399 | if (!pos) | |
400 | return -ENOENT; | |
401 | ||
402 | hash_del_rcu(&pos->bucket_s); | |
403 | hash_del_rcu(&pos->bucket_hw); | |
cdd38b21 | 404 | list_del_rcu(&pos->dev.list); |
5d637d5a PB |
405 | call_rcu(&pos->rcu, llsec_dev_free_rcu); |
406 | ||
407 | return 0; | |
408 | } | |
409 | ||
5d637d5a PB |
410 | static struct mac802154_llsec_device_key* |
411 | llsec_devkey_find(struct mac802154_llsec_device *dev, | |
412 | const struct ieee802154_llsec_key_id *key) | |
413 | { | |
414 | struct ieee802154_llsec_device_key *devkey; | |
415 | ||
416 | list_for_each_entry_rcu(devkey, &dev->dev.keys, list) { | |
417 | if (!llsec_key_id_equal(key, &devkey->key_id)) | |
418 | continue; | |
419 | ||
420 | return container_of(devkey, struct mac802154_llsec_device_key, | |
421 | devkey); | |
422 | } | |
423 | ||
424 | return NULL; | |
425 | } | |
426 | ||
427 | int mac802154_llsec_devkey_add(struct mac802154_llsec *sec, | |
428 | __le64 dev_addr, | |
429 | const struct ieee802154_llsec_device_key *key) | |
430 | { | |
431 | struct mac802154_llsec_device *dev; | |
432 | struct mac802154_llsec_device_key *devkey; | |
433 | ||
434 | dev = llsec_dev_find_long(sec, dev_addr); | |
435 | ||
436 | if (!dev) | |
437 | return -ENOENT; | |
438 | ||
439 | if (llsec_devkey_find(dev, &key->key_id)) | |
440 | return -EEXIST; | |
441 | ||
442 | devkey = kmalloc(sizeof(*devkey), GFP_KERNEL); | |
443 | if (!devkey) | |
444 | return -ENOMEM; | |
445 | ||
446 | devkey->devkey = *key; | |
447 | list_add_tail_rcu(&devkey->devkey.list, &dev->dev.keys); | |
448 | return 0; | |
449 | } | |
450 | ||
451 | int mac802154_llsec_devkey_del(struct mac802154_llsec *sec, | |
452 | __le64 dev_addr, | |
453 | const struct ieee802154_llsec_device_key *key) | |
454 | { | |
455 | struct mac802154_llsec_device *dev; | |
456 | struct mac802154_llsec_device_key *devkey; | |
457 | ||
458 | dev = llsec_dev_find_long(sec, dev_addr); | |
459 | ||
460 | if (!dev) | |
461 | return -ENOENT; | |
462 | ||
463 | devkey = llsec_devkey_find(dev, &key->key_id); | |
464 | if (!devkey) | |
465 | return -ENOENT; | |
466 | ||
467 | list_del_rcu(&devkey->devkey.list); | |
468 | kfree_rcu(devkey, rcu); | |
469 | return 0; | |
470 | } | |
471 | ||
5d637d5a PB |
472 | static struct mac802154_llsec_seclevel* |
473 | llsec_find_seclevel(const struct mac802154_llsec *sec, | |
474 | const struct ieee802154_llsec_seclevel *sl) | |
475 | { | |
476 | struct ieee802154_llsec_seclevel *pos; | |
477 | ||
478 | list_for_each_entry(pos, &sec->table.security_levels, list) { | |
479 | if (pos->frame_type != sl->frame_type || | |
480 | (pos->frame_type == IEEE802154_FC_TYPE_MAC_CMD && | |
481 | pos->cmd_frame_id != sl->cmd_frame_id) || | |
482 | pos->device_override != sl->device_override || | |
483 | pos->sec_levels != sl->sec_levels) | |
484 | continue; | |
485 | ||
486 | return container_of(pos, struct mac802154_llsec_seclevel, | |
487 | level); | |
488 | } | |
489 | ||
490 | return NULL; | |
491 | } | |
492 | ||
493 | int mac802154_llsec_seclevel_add(struct mac802154_llsec *sec, | |
494 | const struct ieee802154_llsec_seclevel *sl) | |
495 | { | |
496 | struct mac802154_llsec_seclevel *entry; | |
497 | ||
498 | if (llsec_find_seclevel(sec, sl)) | |
499 | return -EEXIST; | |
500 | ||
501 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); | |
502 | if (!entry) | |
503 | return -ENOMEM; | |
504 | ||
505 | entry->level = *sl; | |
506 | ||
507 | list_add_tail_rcu(&entry->level.list, &sec->table.security_levels); | |
508 | ||
509 | return 0; | |
510 | } | |
511 | ||
512 | int mac802154_llsec_seclevel_del(struct mac802154_llsec *sec, | |
513 | const struct ieee802154_llsec_seclevel *sl) | |
514 | { | |
515 | struct mac802154_llsec_seclevel *pos; | |
516 | ||
517 | pos = llsec_find_seclevel(sec, sl); | |
518 | if (!pos) | |
519 | return -ENOENT; | |
520 | ||
521 | list_del_rcu(&pos->level.list); | |
522 | kfree_rcu(pos, rcu); | |
523 | ||
524 | return 0; | |
525 | } | |
03556e4d | 526 | |
03556e4d PB |
527 | static int llsec_recover_addr(struct mac802154_llsec *sec, |
528 | struct ieee802154_addr *addr) | |
529 | { | |
530 | __le16 caddr = sec->params.coord_shortaddr; | |
4710d806 | 531 | |
03556e4d PB |
532 | addr->pan_id = sec->params.pan_id; |
533 | ||
534 | if (caddr == cpu_to_le16(IEEE802154_ADDR_BROADCAST)) { | |
535 | return -EINVAL; | |
536 | } else if (caddr == cpu_to_le16(IEEE802154_ADDR_UNDEF)) { | |
537 | addr->extended_addr = sec->params.coord_hwaddr; | |
538 | addr->mode = IEEE802154_ADDR_LONG; | |
539 | } else { | |
540 | addr->short_addr = sec->params.coord_shortaddr; | |
541 | addr->mode = IEEE802154_ADDR_SHORT; | |
542 | } | |
543 | ||
544 | return 0; | |
545 | } | |
546 | ||
547 | static struct mac802154_llsec_key* | |
548 | llsec_lookup_key(struct mac802154_llsec *sec, | |
549 | const struct ieee802154_hdr *hdr, | |
550 | const struct ieee802154_addr *addr, | |
551 | struct ieee802154_llsec_key_id *key_id) | |
552 | { | |
553 | struct ieee802154_addr devaddr = *addr; | |
554 | u8 key_id_mode = hdr->sec.key_id_mode; | |
555 | struct ieee802154_llsec_key_entry *key_entry; | |
556 | struct mac802154_llsec_key *key; | |
557 | ||
558 | if (key_id_mode == IEEE802154_SCF_KEY_IMPLICIT && | |
559 | devaddr.mode == IEEE802154_ADDR_NONE) { | |
560 | if (hdr->fc.type == IEEE802154_FC_TYPE_BEACON) { | |
561 | devaddr.extended_addr = sec->params.coord_hwaddr; | |
562 | devaddr.mode = IEEE802154_ADDR_LONG; | |
563 | } else if (llsec_recover_addr(sec, &devaddr) < 0) { | |
564 | return NULL; | |
565 | } | |
566 | } | |
567 | ||
568 | list_for_each_entry_rcu(key_entry, &sec->table.keys, list) { | |
569 | const struct ieee802154_llsec_key_id *id = &key_entry->id; | |
570 | ||
571 | if (!(key_entry->key->frame_types & BIT(hdr->fc.type))) | |
572 | continue; | |
573 | ||
574 | if (id->mode != key_id_mode) | |
575 | continue; | |
576 | ||
577 | if (key_id_mode == IEEE802154_SCF_KEY_IMPLICIT) { | |
578 | if (ieee802154_addr_equal(&devaddr, &id->device_addr)) | |
579 | goto found; | |
580 | } else { | |
581 | if (id->id != hdr->sec.key_id) | |
582 | continue; | |
583 | ||
584 | if ((key_id_mode == IEEE802154_SCF_KEY_INDEX) || | |
585 | (key_id_mode == IEEE802154_SCF_KEY_SHORT_INDEX && | |
586 | id->short_source == hdr->sec.short_src) || | |
587 | (key_id_mode == IEEE802154_SCF_KEY_HW_INDEX && | |
588 | id->extended_source == hdr->sec.extended_src)) | |
589 | goto found; | |
590 | } | |
591 | } | |
592 | ||
593 | return NULL; | |
594 | ||
595 | found: | |
596 | key = container_of(key_entry->key, struct mac802154_llsec_key, key); | |
597 | if (key_id) | |
598 | *key_id = key_entry->id; | |
599 | return llsec_key_get(key); | |
600 | } | |
601 | ||
03556e4d PB |
602 | static void llsec_geniv(u8 iv[16], __le64 addr, |
603 | const struct ieee802154_sechdr *sec) | |
604 | { | |
605 | __be64 addr_bytes = (__force __be64) swab64((__force u64) addr); | |
606 | __be32 frame_counter = (__force __be32) swab32((__force u32) sec->frame_counter); | |
607 | ||
608 | iv[0] = 1; /* L' = L - 1 = 1 */ | |
609 | memcpy(iv + 1, &addr_bytes, sizeof(addr_bytes)); | |
610 | memcpy(iv + 9, &frame_counter, sizeof(frame_counter)); | |
611 | iv[13] = sec->level; | |
612 | iv[14] = 0; | |
613 | iv[15] = 1; | |
614 | } | |
615 | ||
616 | static int | |
617 | llsec_do_encrypt_unauth(struct sk_buff *skb, const struct mac802154_llsec *sec, | |
618 | const struct ieee802154_hdr *hdr, | |
619 | struct mac802154_llsec_key *key) | |
620 | { | |
621 | u8 iv[16]; | |
622 | struct scatterlist src; | |
96953718 HX |
623 | SKCIPHER_REQUEST_ON_STACK(req, key->tfm0); |
624 | int err; | |
03556e4d PB |
625 | |
626 | llsec_geniv(iv, sec->params.hwaddr, &hdr->sec); | |
627 | sg_init_one(&src, skb->data, skb->len); | |
96953718 HX |
628 | skcipher_request_set_tfm(req, key->tfm0); |
629 | skcipher_request_set_callback(req, 0, NULL, NULL); | |
630 | skcipher_request_set_crypt(req, &src, &src, skb->len, iv); | |
631 | err = crypto_skcipher_encrypt(req); | |
632 | skcipher_request_zero(req); | |
633 | return err; | |
03556e4d PB |
634 | } |
635 | ||
636 | static struct crypto_aead* | |
637 | llsec_tfm_by_len(struct mac802154_llsec_key *key, int authlen) | |
638 | { | |
639 | int i; | |
640 | ||
641 | for (i = 0; i < ARRAY_SIZE(key->tfm); i++) | |
642 | if (crypto_aead_authsize(key->tfm[i]) == authlen) | |
643 | return key->tfm[i]; | |
644 | ||
645 | BUG(); | |
646 | } | |
647 | ||
648 | static int | |
649 | llsec_do_encrypt_auth(struct sk_buff *skb, const struct mac802154_llsec *sec, | |
650 | const struct ieee802154_hdr *hdr, | |
651 | struct mac802154_llsec_key *key) | |
652 | { | |
653 | u8 iv[16]; | |
654 | unsigned char *data; | |
655 | int authlen, assoclen, datalen, rc; | |
25528fda | 656 | struct scatterlist sg; |
03556e4d PB |
657 | struct aead_request *req; |
658 | ||
659 | authlen = ieee802154_sechdr_authtag_len(&hdr->sec); | |
660 | llsec_geniv(iv, sec->params.hwaddr, &hdr->sec); | |
661 | ||
662 | req = aead_request_alloc(llsec_tfm_by_len(key, authlen), GFP_ATOMIC); | |
663 | if (!req) | |
664 | return -ENOMEM; | |
665 | ||
03556e4d PB |
666 | assoclen = skb->mac_len; |
667 | ||
668 | data = skb_mac_header(skb) + skb->mac_len; | |
669 | datalen = skb_tail_pointer(skb) - data; | |
670 | ||
25528fda HX |
671 | skb_put(skb, authlen); |
672 | ||
673 | sg_init_one(&sg, skb_mac_header(skb), assoclen + datalen + authlen); | |
674 | ||
675 | if (!(hdr->sec.level & IEEE802154_SCF_SECLEVEL_ENC)) { | |
03556e4d PB |
676 | assoclen += datalen; |
677 | datalen = 0; | |
678 | } | |
679 | ||
03556e4d | 680 | aead_request_set_callback(req, 0, NULL, NULL); |
25528fda HX |
681 | aead_request_set_crypt(req, &sg, &sg, datalen, iv); |
682 | aead_request_set_ad(req, assoclen); | |
03556e4d PB |
683 | |
684 | rc = crypto_aead_encrypt(req); | |
685 | ||
71cd2aa5 | 686 | kzfree(req); |
03556e4d PB |
687 | |
688 | return rc; | |
689 | } | |
690 | ||
691 | static int llsec_do_encrypt(struct sk_buff *skb, | |
692 | const struct mac802154_llsec *sec, | |
693 | const struct ieee802154_hdr *hdr, | |
694 | struct mac802154_llsec_key *key) | |
695 | { | |
696 | if (hdr->sec.level == IEEE802154_SCF_SECLEVEL_ENC) | |
697 | return llsec_do_encrypt_unauth(skb, sec, hdr, key); | |
698 | else | |
699 | return llsec_do_encrypt_auth(skb, sec, hdr, key); | |
700 | } | |
701 | ||
702 | int mac802154_llsec_encrypt(struct mac802154_llsec *sec, struct sk_buff *skb) | |
703 | { | |
704 | struct ieee802154_hdr hdr; | |
705 | int rc, authlen, hlen; | |
706 | struct mac802154_llsec_key *key; | |
707 | u32 frame_ctr; | |
708 | ||
709 | hlen = ieee802154_hdr_pull(skb, &hdr); | |
710 | ||
711 | if (hlen < 0 || hdr.fc.type != IEEE802154_FC_TYPE_DATA) | |
712 | return -EINVAL; | |
713 | ||
714 | if (!hdr.fc.security_enabled || hdr.sec.level == 0) { | |
715 | skb_push(skb, hlen); | |
716 | return 0; | |
717 | } | |
718 | ||
719 | authlen = ieee802154_sechdr_authtag_len(&hdr.sec); | |
720 | ||
721 | if (skb->len + hlen + authlen + IEEE802154_MFR_SIZE > IEEE802154_MTU) | |
722 | return -EMSGSIZE; | |
723 | ||
724 | rcu_read_lock(); | |
725 | ||
726 | read_lock_bh(&sec->lock); | |
727 | ||
728 | if (!sec->params.enabled) { | |
729 | rc = -EINVAL; | |
730 | goto fail_read; | |
731 | } | |
732 | ||
733 | key = llsec_lookup_key(sec, &hdr, &hdr.dest, NULL); | |
734 | if (!key) { | |
735 | rc = -ENOKEY; | |
736 | goto fail_read; | |
737 | } | |
738 | ||
739 | read_unlock_bh(&sec->lock); | |
740 | ||
741 | write_lock_bh(&sec->lock); | |
742 | ||
743 | frame_ctr = be32_to_cpu(sec->params.frame_counter); | |
744 | hdr.sec.frame_counter = cpu_to_le32(frame_ctr); | |
745 | if (frame_ctr == 0xFFFFFFFF) { | |
746 | write_unlock_bh(&sec->lock); | |
747 | llsec_key_put(key); | |
748 | rc = -EOVERFLOW; | |
749 | goto fail; | |
750 | } | |
751 | ||
752 | sec->params.frame_counter = cpu_to_be32(frame_ctr + 1); | |
753 | ||
754 | write_unlock_bh(&sec->lock); | |
755 | ||
756 | rcu_read_unlock(); | |
757 | ||
758 | skb->mac_len = ieee802154_hdr_push(skb, &hdr); | |
759 | skb_reset_mac_header(skb); | |
760 | ||
761 | rc = llsec_do_encrypt(skb, sec, &hdr, key); | |
762 | llsec_key_put(key); | |
763 | ||
62e9c117 | 764 | return rc; |
03556e4d PB |
765 | |
766 | fail_read: | |
6f3eabcd | 767 | read_unlock_bh(&sec->lock); |
03556e4d PB |
768 | fail: |
769 | rcu_read_unlock(); | |
770 | return rc; | |
771 | } | |
4c14a2fb | 772 | |
4c14a2fb PB |
773 | static struct mac802154_llsec_device* |
774 | llsec_lookup_dev(struct mac802154_llsec *sec, | |
775 | const struct ieee802154_addr *addr) | |
776 | { | |
777 | struct ieee802154_addr devaddr = *addr; | |
778 | struct mac802154_llsec_device *dev = NULL; | |
779 | ||
780 | if (devaddr.mode == IEEE802154_ADDR_NONE && | |
781 | llsec_recover_addr(sec, &devaddr) < 0) | |
782 | return NULL; | |
783 | ||
784 | if (devaddr.mode == IEEE802154_ADDR_SHORT) { | |
785 | u32 key = llsec_dev_hash_short(devaddr.short_addr, | |
786 | devaddr.pan_id); | |
787 | ||
788 | hash_for_each_possible_rcu(sec->devices_short, dev, | |
789 | bucket_s, key) { | |
790 | if (dev->dev.pan_id == devaddr.pan_id && | |
791 | dev->dev.short_addr == devaddr.short_addr) | |
792 | return dev; | |
793 | } | |
794 | } else { | |
795 | u64 key = llsec_dev_hash_long(devaddr.extended_addr); | |
796 | ||
797 | hash_for_each_possible_rcu(sec->devices_hw, dev, | |
798 | bucket_hw, key) { | |
799 | if (dev->dev.hwaddr == devaddr.extended_addr) | |
800 | return dev; | |
801 | } | |
802 | } | |
803 | ||
804 | return NULL; | |
805 | } | |
806 | ||
807 | static int | |
808 | llsec_lookup_seclevel(const struct mac802154_llsec *sec, | |
809 | u8 frame_type, u8 cmd_frame_id, | |
810 | struct ieee802154_llsec_seclevel *rlevel) | |
811 | { | |
812 | struct ieee802154_llsec_seclevel *level; | |
813 | ||
814 | list_for_each_entry_rcu(level, &sec->table.security_levels, list) { | |
815 | if (level->frame_type == frame_type && | |
816 | (frame_type != IEEE802154_FC_TYPE_MAC_CMD || | |
817 | level->cmd_frame_id == cmd_frame_id)) { | |
818 | *rlevel = *level; | |
819 | return 0; | |
820 | } | |
821 | } | |
822 | ||
823 | return -EINVAL; | |
824 | } | |
825 | ||
826 | static int | |
827 | llsec_do_decrypt_unauth(struct sk_buff *skb, const struct mac802154_llsec *sec, | |
828 | const struct ieee802154_hdr *hdr, | |
829 | struct mac802154_llsec_key *key, __le64 dev_addr) | |
830 | { | |
831 | u8 iv[16]; | |
832 | unsigned char *data; | |
833 | int datalen; | |
834 | struct scatterlist src; | |
96953718 HX |
835 | SKCIPHER_REQUEST_ON_STACK(req, key->tfm0); |
836 | int err; | |
4c14a2fb PB |
837 | |
838 | llsec_geniv(iv, dev_addr, &hdr->sec); | |
839 | data = skb_mac_header(skb) + skb->mac_len; | |
840 | datalen = skb_tail_pointer(skb) - data; | |
841 | ||
842 | sg_init_one(&src, data, datalen); | |
843 | ||
96953718 HX |
844 | skcipher_request_set_tfm(req, key->tfm0); |
845 | skcipher_request_set_callback(req, 0, NULL, NULL); | |
846 | skcipher_request_set_crypt(req, &src, &src, datalen, iv); | |
847 | ||
848 | err = crypto_skcipher_decrypt(req); | |
849 | skcipher_request_zero(req); | |
850 | return err; | |
4c14a2fb PB |
851 | } |
852 | ||
853 | static int | |
854 | llsec_do_decrypt_auth(struct sk_buff *skb, const struct mac802154_llsec *sec, | |
855 | const struct ieee802154_hdr *hdr, | |
856 | struct mac802154_llsec_key *key, __le64 dev_addr) | |
857 | { | |
858 | u8 iv[16]; | |
859 | unsigned char *data; | |
860 | int authlen, datalen, assoclen, rc; | |
25528fda | 861 | struct scatterlist sg; |
4c14a2fb PB |
862 | struct aead_request *req; |
863 | ||
864 | authlen = ieee802154_sechdr_authtag_len(&hdr->sec); | |
865 | llsec_geniv(iv, dev_addr, &hdr->sec); | |
866 | ||
867 | req = aead_request_alloc(llsec_tfm_by_len(key, authlen), GFP_ATOMIC); | |
868 | if (!req) | |
869 | return -ENOMEM; | |
870 | ||
4c14a2fb PB |
871 | assoclen = skb->mac_len; |
872 | ||
873 | data = skb_mac_header(skb) + skb->mac_len; | |
874 | datalen = skb_tail_pointer(skb) - data; | |
875 | ||
25528fda HX |
876 | sg_init_one(&sg, skb_mac_header(skb), assoclen + datalen); |
877 | ||
878 | if (!(hdr->sec.level & IEEE802154_SCF_SECLEVEL_ENC)) { | |
4c14a2fb | 879 | assoclen += datalen - authlen; |
4c14a2fb PB |
880 | datalen = authlen; |
881 | } | |
882 | ||
4c14a2fb | 883 | aead_request_set_callback(req, 0, NULL, NULL); |
25528fda HX |
884 | aead_request_set_crypt(req, &sg, &sg, datalen, iv); |
885 | aead_request_set_ad(req, assoclen); | |
4c14a2fb PB |
886 | |
887 | rc = crypto_aead_decrypt(req); | |
888 | ||
71cd2aa5 | 889 | kzfree(req); |
4c14a2fb PB |
890 | skb_trim(skb, skb->len - authlen); |
891 | ||
892 | return rc; | |
893 | } | |
894 | ||
895 | static int | |
896 | llsec_do_decrypt(struct sk_buff *skb, const struct mac802154_llsec *sec, | |
897 | const struct ieee802154_hdr *hdr, | |
898 | struct mac802154_llsec_key *key, __le64 dev_addr) | |
899 | { | |
900 | if (hdr->sec.level == IEEE802154_SCF_SECLEVEL_ENC) | |
901 | return llsec_do_decrypt_unauth(skb, sec, hdr, key, dev_addr); | |
902 | else | |
903 | return llsec_do_decrypt_auth(skb, sec, hdr, key, dev_addr); | |
904 | } | |
905 | ||
f0f77dc6 PB |
906 | static int |
907 | llsec_update_devkey_record(struct mac802154_llsec_device *dev, | |
908 | const struct ieee802154_llsec_key_id *in_key) | |
909 | { | |
910 | struct mac802154_llsec_device_key *devkey; | |
911 | ||
912 | devkey = llsec_devkey_find(dev, in_key); | |
913 | ||
914 | if (!devkey) { | |
915 | struct mac802154_llsec_device_key *next; | |
916 | ||
917 | next = kzalloc(sizeof(*devkey), GFP_ATOMIC); | |
918 | if (!next) | |
919 | return -ENOMEM; | |
920 | ||
921 | next->devkey.key_id = *in_key; | |
922 | ||
923 | spin_lock_bh(&dev->lock); | |
924 | ||
925 | devkey = llsec_devkey_find(dev, in_key); | |
926 | if (!devkey) | |
927 | list_add_rcu(&next->devkey.list, &dev->dev.keys); | |
928 | else | |
71cd2aa5 | 929 | kzfree(next); |
f0f77dc6 PB |
930 | |
931 | spin_unlock_bh(&dev->lock); | |
932 | } | |
933 | ||
934 | return 0; | |
935 | } | |
936 | ||
4c14a2fb PB |
937 | static int |
938 | llsec_update_devkey_info(struct mac802154_llsec_device *dev, | |
939 | const struct ieee802154_llsec_key_id *in_key, | |
940 | u32 frame_counter) | |
941 | { | |
942 | struct mac802154_llsec_device_key *devkey = NULL; | |
943 | ||
944 | if (dev->dev.key_mode == IEEE802154_LLSEC_DEVKEY_RESTRICT) { | |
945 | devkey = llsec_devkey_find(dev, in_key); | |
946 | if (!devkey) | |
947 | return -ENOENT; | |
948 | } | |
949 | ||
f0f77dc6 PB |
950 | if (dev->dev.key_mode == IEEE802154_LLSEC_DEVKEY_RECORD) { |
951 | int rc = llsec_update_devkey_record(dev, in_key); | |
952 | ||
953 | if (rc < 0) | |
954 | return rc; | |
955 | } | |
956 | ||
4c14a2fb PB |
957 | spin_lock_bh(&dev->lock); |
958 | ||
959 | if ((!devkey && frame_counter < dev->dev.frame_counter) || | |
960 | (devkey && frame_counter < devkey->devkey.frame_counter)) { | |
961 | spin_unlock_bh(&dev->lock); | |
962 | return -EINVAL; | |
963 | } | |
964 | ||
965 | if (devkey) | |
966 | devkey->devkey.frame_counter = frame_counter + 1; | |
967 | else | |
968 | dev->dev.frame_counter = frame_counter + 1; | |
969 | ||
970 | spin_unlock_bh(&dev->lock); | |
971 | ||
972 | return 0; | |
973 | } | |
974 | ||
975 | int mac802154_llsec_decrypt(struct mac802154_llsec *sec, struct sk_buff *skb) | |
976 | { | |
977 | struct ieee802154_hdr hdr; | |
978 | struct mac802154_llsec_key *key; | |
979 | struct ieee802154_llsec_key_id key_id; | |
980 | struct mac802154_llsec_device *dev; | |
981 | struct ieee802154_llsec_seclevel seclevel; | |
982 | int err; | |
983 | __le64 dev_addr; | |
984 | u32 frame_ctr; | |
985 | ||
986 | if (ieee802154_hdr_peek(skb, &hdr) < 0) | |
987 | return -EINVAL; | |
988 | if (!hdr.fc.security_enabled) | |
989 | return 0; | |
990 | if (hdr.fc.version == 0) | |
991 | return -EINVAL; | |
992 | ||
993 | read_lock_bh(&sec->lock); | |
994 | if (!sec->params.enabled) { | |
995 | read_unlock_bh(&sec->lock); | |
996 | return -EINVAL; | |
997 | } | |
998 | read_unlock_bh(&sec->lock); | |
999 | ||
1000 | rcu_read_lock(); | |
1001 | ||
1002 | key = llsec_lookup_key(sec, &hdr, &hdr.source, &key_id); | |
1003 | if (!key) { | |
1004 | err = -ENOKEY; | |
1005 | goto fail; | |
1006 | } | |
1007 | ||
1008 | dev = llsec_lookup_dev(sec, &hdr.source); | |
1009 | if (!dev) { | |
1010 | err = -EINVAL; | |
1011 | goto fail_dev; | |
1012 | } | |
1013 | ||
1014 | if (llsec_lookup_seclevel(sec, hdr.fc.type, 0, &seclevel) < 0) { | |
1015 | err = -EINVAL; | |
1016 | goto fail_dev; | |
1017 | } | |
1018 | ||
1019 | if (!(seclevel.sec_levels & BIT(hdr.sec.level)) && | |
1020 | (hdr.sec.level == 0 && seclevel.device_override && | |
1021 | !dev->dev.seclevel_exempt)) { | |
1022 | err = -EINVAL; | |
1023 | goto fail_dev; | |
1024 | } | |
1025 | ||
1026 | frame_ctr = le32_to_cpu(hdr.sec.frame_counter); | |
1027 | ||
1028 | if (frame_ctr == 0xffffffff) { | |
1029 | err = -EOVERFLOW; | |
1030 | goto fail_dev; | |
1031 | } | |
1032 | ||
1033 | err = llsec_update_devkey_info(dev, &key_id, frame_ctr); | |
1034 | if (err) | |
1035 | goto fail_dev; | |
1036 | ||
1037 | dev_addr = dev->dev.hwaddr; | |
1038 | ||
1039 | rcu_read_unlock(); | |
1040 | ||
1041 | err = llsec_do_decrypt(skb, sec, &hdr, key, dev_addr); | |
1042 | llsec_key_put(key); | |
1043 | return err; | |
1044 | ||
1045 | fail_dev: | |
1046 | llsec_key_put(key); | |
1047 | fail: | |
1048 | rcu_read_unlock(); | |
1049 | return err; | |
1050 | } |