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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> | |
8a1a2b71 | 20 | #include <linux/crypto.h> |
4ca24aca | 21 | #include <linux/ieee802154.h> |
8a1a2b71 | 22 | #include <crypto/aead.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); | |
58 | kfree(msl); | |
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); | |
75 | kfree(key); | |
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 | ||
147 | key->tfm0 = crypto_alloc_blkcipher("ctr(aes)", 0, CRYPTO_ALG_ASYNC); | |
89eb6d06 | 148 | if (IS_ERR(key->tfm0)) |
5d637d5a PB |
149 | goto err_tfm; |
150 | ||
151 | if (crypto_blkcipher_setkey(key->tfm0, template->key, | |
152 | IEEE802154_LLSEC_KEY_SIZE)) | |
153 | goto err_tfm0; | |
154 | ||
155 | return key; | |
156 | ||
157 | err_tfm0: | |
158 | crypto_free_blkcipher(key->tfm0); | |
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 | ||
164 | kfree(key); | |
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 | ||
178 | crypto_free_blkcipher(key->tfm0); | |
179 | kfree(key); | |
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: | |
270 | kfree(new); | |
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); | |
350 | kfree(devkey); | |
351 | } | |
352 | ||
353 | kfree(dev); | |
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); | |
404 | call_rcu(&pos->rcu, llsec_dev_free_rcu); | |
405 | ||
406 | return 0; | |
407 | } | |
408 | ||
5d637d5a PB |
409 | static struct mac802154_llsec_device_key* |
410 | llsec_devkey_find(struct mac802154_llsec_device *dev, | |
411 | const struct ieee802154_llsec_key_id *key) | |
412 | { | |
413 | struct ieee802154_llsec_device_key *devkey; | |
414 | ||
415 | list_for_each_entry_rcu(devkey, &dev->dev.keys, list) { | |
416 | if (!llsec_key_id_equal(key, &devkey->key_id)) | |
417 | continue; | |
418 | ||
419 | return container_of(devkey, struct mac802154_llsec_device_key, | |
420 | devkey); | |
421 | } | |
422 | ||
423 | return NULL; | |
424 | } | |
425 | ||
426 | int mac802154_llsec_devkey_add(struct mac802154_llsec *sec, | |
427 | __le64 dev_addr, | |
428 | const struct ieee802154_llsec_device_key *key) | |
429 | { | |
430 | struct mac802154_llsec_device *dev; | |
431 | struct mac802154_llsec_device_key *devkey; | |
432 | ||
433 | dev = llsec_dev_find_long(sec, dev_addr); | |
434 | ||
435 | if (!dev) | |
436 | return -ENOENT; | |
437 | ||
438 | if (llsec_devkey_find(dev, &key->key_id)) | |
439 | return -EEXIST; | |
440 | ||
441 | devkey = kmalloc(sizeof(*devkey), GFP_KERNEL); | |
442 | if (!devkey) | |
443 | return -ENOMEM; | |
444 | ||
445 | devkey->devkey = *key; | |
446 | list_add_tail_rcu(&devkey->devkey.list, &dev->dev.keys); | |
447 | return 0; | |
448 | } | |
449 | ||
450 | int mac802154_llsec_devkey_del(struct mac802154_llsec *sec, | |
451 | __le64 dev_addr, | |
452 | const struct ieee802154_llsec_device_key *key) | |
453 | { | |
454 | struct mac802154_llsec_device *dev; | |
455 | struct mac802154_llsec_device_key *devkey; | |
456 | ||
457 | dev = llsec_dev_find_long(sec, dev_addr); | |
458 | ||
459 | if (!dev) | |
460 | return -ENOENT; | |
461 | ||
462 | devkey = llsec_devkey_find(dev, &key->key_id); | |
463 | if (!devkey) | |
464 | return -ENOENT; | |
465 | ||
466 | list_del_rcu(&devkey->devkey.list); | |
467 | kfree_rcu(devkey, rcu); | |
468 | return 0; | |
469 | } | |
470 | ||
5d637d5a PB |
471 | static struct mac802154_llsec_seclevel* |
472 | llsec_find_seclevel(const struct mac802154_llsec *sec, | |
473 | const struct ieee802154_llsec_seclevel *sl) | |
474 | { | |
475 | struct ieee802154_llsec_seclevel *pos; | |
476 | ||
477 | list_for_each_entry(pos, &sec->table.security_levels, list) { | |
478 | if (pos->frame_type != sl->frame_type || | |
479 | (pos->frame_type == IEEE802154_FC_TYPE_MAC_CMD && | |
480 | pos->cmd_frame_id != sl->cmd_frame_id) || | |
481 | pos->device_override != sl->device_override || | |
482 | pos->sec_levels != sl->sec_levels) | |
483 | continue; | |
484 | ||
485 | return container_of(pos, struct mac802154_llsec_seclevel, | |
486 | level); | |
487 | } | |
488 | ||
489 | return NULL; | |
490 | } | |
491 | ||
492 | int mac802154_llsec_seclevel_add(struct mac802154_llsec *sec, | |
493 | const struct ieee802154_llsec_seclevel *sl) | |
494 | { | |
495 | struct mac802154_llsec_seclevel *entry; | |
496 | ||
497 | if (llsec_find_seclevel(sec, sl)) | |
498 | return -EEXIST; | |
499 | ||
500 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); | |
501 | if (!entry) | |
502 | return -ENOMEM; | |
503 | ||
504 | entry->level = *sl; | |
505 | ||
506 | list_add_tail_rcu(&entry->level.list, &sec->table.security_levels); | |
507 | ||
508 | return 0; | |
509 | } | |
510 | ||
511 | int mac802154_llsec_seclevel_del(struct mac802154_llsec *sec, | |
512 | const struct ieee802154_llsec_seclevel *sl) | |
513 | { | |
514 | struct mac802154_llsec_seclevel *pos; | |
515 | ||
516 | pos = llsec_find_seclevel(sec, sl); | |
517 | if (!pos) | |
518 | return -ENOENT; | |
519 | ||
520 | list_del_rcu(&pos->level.list); | |
521 | kfree_rcu(pos, rcu); | |
522 | ||
523 | return 0; | |
524 | } | |
03556e4d | 525 | |
03556e4d PB |
526 | static int llsec_recover_addr(struct mac802154_llsec *sec, |
527 | struct ieee802154_addr *addr) | |
528 | { | |
529 | __le16 caddr = sec->params.coord_shortaddr; | |
4710d806 | 530 | |
03556e4d PB |
531 | addr->pan_id = sec->params.pan_id; |
532 | ||
533 | if (caddr == cpu_to_le16(IEEE802154_ADDR_BROADCAST)) { | |
534 | return -EINVAL; | |
535 | } else if (caddr == cpu_to_le16(IEEE802154_ADDR_UNDEF)) { | |
536 | addr->extended_addr = sec->params.coord_hwaddr; | |
537 | addr->mode = IEEE802154_ADDR_LONG; | |
538 | } else { | |
539 | addr->short_addr = sec->params.coord_shortaddr; | |
540 | addr->mode = IEEE802154_ADDR_SHORT; | |
541 | } | |
542 | ||
543 | return 0; | |
544 | } | |
545 | ||
546 | static struct mac802154_llsec_key* | |
547 | llsec_lookup_key(struct mac802154_llsec *sec, | |
548 | const struct ieee802154_hdr *hdr, | |
549 | const struct ieee802154_addr *addr, | |
550 | struct ieee802154_llsec_key_id *key_id) | |
551 | { | |
552 | struct ieee802154_addr devaddr = *addr; | |
553 | u8 key_id_mode = hdr->sec.key_id_mode; | |
554 | struct ieee802154_llsec_key_entry *key_entry; | |
555 | struct mac802154_llsec_key *key; | |
556 | ||
557 | if (key_id_mode == IEEE802154_SCF_KEY_IMPLICIT && | |
558 | devaddr.mode == IEEE802154_ADDR_NONE) { | |
559 | if (hdr->fc.type == IEEE802154_FC_TYPE_BEACON) { | |
560 | devaddr.extended_addr = sec->params.coord_hwaddr; | |
561 | devaddr.mode = IEEE802154_ADDR_LONG; | |
562 | } else if (llsec_recover_addr(sec, &devaddr) < 0) { | |
563 | return NULL; | |
564 | } | |
565 | } | |
566 | ||
567 | list_for_each_entry_rcu(key_entry, &sec->table.keys, list) { | |
568 | const struct ieee802154_llsec_key_id *id = &key_entry->id; | |
569 | ||
570 | if (!(key_entry->key->frame_types & BIT(hdr->fc.type))) | |
571 | continue; | |
572 | ||
573 | if (id->mode != key_id_mode) | |
574 | continue; | |
575 | ||
576 | if (key_id_mode == IEEE802154_SCF_KEY_IMPLICIT) { | |
577 | if (ieee802154_addr_equal(&devaddr, &id->device_addr)) | |
578 | goto found; | |
579 | } else { | |
580 | if (id->id != hdr->sec.key_id) | |
581 | continue; | |
582 | ||
583 | if ((key_id_mode == IEEE802154_SCF_KEY_INDEX) || | |
584 | (key_id_mode == IEEE802154_SCF_KEY_SHORT_INDEX && | |
585 | id->short_source == hdr->sec.short_src) || | |
586 | (key_id_mode == IEEE802154_SCF_KEY_HW_INDEX && | |
587 | id->extended_source == hdr->sec.extended_src)) | |
588 | goto found; | |
589 | } | |
590 | } | |
591 | ||
592 | return NULL; | |
593 | ||
594 | found: | |
595 | key = container_of(key_entry->key, struct mac802154_llsec_key, key); | |
596 | if (key_id) | |
597 | *key_id = key_entry->id; | |
598 | return llsec_key_get(key); | |
599 | } | |
600 | ||
03556e4d PB |
601 | static void llsec_geniv(u8 iv[16], __le64 addr, |
602 | const struct ieee802154_sechdr *sec) | |
603 | { | |
604 | __be64 addr_bytes = (__force __be64) swab64((__force u64) addr); | |
605 | __be32 frame_counter = (__force __be32) swab32((__force u32) sec->frame_counter); | |
606 | ||
607 | iv[0] = 1; /* L' = L - 1 = 1 */ | |
608 | memcpy(iv + 1, &addr_bytes, sizeof(addr_bytes)); | |
609 | memcpy(iv + 9, &frame_counter, sizeof(frame_counter)); | |
610 | iv[13] = sec->level; | |
611 | iv[14] = 0; | |
612 | iv[15] = 1; | |
613 | } | |
614 | ||
615 | static int | |
616 | llsec_do_encrypt_unauth(struct sk_buff *skb, const struct mac802154_llsec *sec, | |
617 | const struct ieee802154_hdr *hdr, | |
618 | struct mac802154_llsec_key *key) | |
619 | { | |
620 | u8 iv[16]; | |
621 | struct scatterlist src; | |
622 | struct blkcipher_desc req = { | |
623 | .tfm = key->tfm0, | |
624 | .info = iv, | |
625 | .flags = 0, | |
626 | }; | |
627 | ||
628 | llsec_geniv(iv, sec->params.hwaddr, &hdr->sec); | |
629 | sg_init_one(&src, skb->data, skb->len); | |
630 | return crypto_blkcipher_encrypt_iv(&req, &src, &src, skb->len); | |
631 | } | |
632 | ||
633 | static struct crypto_aead* | |
634 | llsec_tfm_by_len(struct mac802154_llsec_key *key, int authlen) | |
635 | { | |
636 | int i; | |
637 | ||
638 | for (i = 0; i < ARRAY_SIZE(key->tfm); i++) | |
639 | if (crypto_aead_authsize(key->tfm[i]) == authlen) | |
640 | return key->tfm[i]; | |
641 | ||
642 | BUG(); | |
643 | } | |
644 | ||
645 | static int | |
646 | llsec_do_encrypt_auth(struct sk_buff *skb, const struct mac802154_llsec *sec, | |
647 | const struct ieee802154_hdr *hdr, | |
648 | struct mac802154_llsec_key *key) | |
649 | { | |
650 | u8 iv[16]; | |
651 | unsigned char *data; | |
652 | int authlen, assoclen, datalen, rc; | |
25528fda | 653 | struct scatterlist sg; |
03556e4d PB |
654 | struct aead_request *req; |
655 | ||
656 | authlen = ieee802154_sechdr_authtag_len(&hdr->sec); | |
657 | llsec_geniv(iv, sec->params.hwaddr, &hdr->sec); | |
658 | ||
659 | req = aead_request_alloc(llsec_tfm_by_len(key, authlen), GFP_ATOMIC); | |
660 | if (!req) | |
661 | return -ENOMEM; | |
662 | ||
03556e4d PB |
663 | assoclen = skb->mac_len; |
664 | ||
665 | data = skb_mac_header(skb) + skb->mac_len; | |
666 | datalen = skb_tail_pointer(skb) - data; | |
667 | ||
25528fda HX |
668 | skb_put(skb, authlen); |
669 | ||
670 | sg_init_one(&sg, skb_mac_header(skb), assoclen + datalen + authlen); | |
671 | ||
672 | if (!(hdr->sec.level & IEEE802154_SCF_SECLEVEL_ENC)) { | |
03556e4d PB |
673 | assoclen += datalen; |
674 | datalen = 0; | |
675 | } | |
676 | ||
03556e4d | 677 | aead_request_set_callback(req, 0, NULL, NULL); |
25528fda HX |
678 | aead_request_set_crypt(req, &sg, &sg, datalen, iv); |
679 | aead_request_set_ad(req, assoclen); | |
03556e4d PB |
680 | |
681 | rc = crypto_aead_encrypt(req); | |
682 | ||
683 | kfree(req); | |
684 | ||
685 | return rc; | |
686 | } | |
687 | ||
688 | static int llsec_do_encrypt(struct sk_buff *skb, | |
689 | const struct mac802154_llsec *sec, | |
690 | const struct ieee802154_hdr *hdr, | |
691 | struct mac802154_llsec_key *key) | |
692 | { | |
693 | if (hdr->sec.level == IEEE802154_SCF_SECLEVEL_ENC) | |
694 | return llsec_do_encrypt_unauth(skb, sec, hdr, key); | |
695 | else | |
696 | return llsec_do_encrypt_auth(skb, sec, hdr, key); | |
697 | } | |
698 | ||
699 | int mac802154_llsec_encrypt(struct mac802154_llsec *sec, struct sk_buff *skb) | |
700 | { | |
701 | struct ieee802154_hdr hdr; | |
702 | int rc, authlen, hlen; | |
703 | struct mac802154_llsec_key *key; | |
704 | u32 frame_ctr; | |
705 | ||
706 | hlen = ieee802154_hdr_pull(skb, &hdr); | |
707 | ||
708 | if (hlen < 0 || hdr.fc.type != IEEE802154_FC_TYPE_DATA) | |
709 | return -EINVAL; | |
710 | ||
711 | if (!hdr.fc.security_enabled || hdr.sec.level == 0) { | |
712 | skb_push(skb, hlen); | |
713 | return 0; | |
714 | } | |
715 | ||
716 | authlen = ieee802154_sechdr_authtag_len(&hdr.sec); | |
717 | ||
718 | if (skb->len + hlen + authlen + IEEE802154_MFR_SIZE > IEEE802154_MTU) | |
719 | return -EMSGSIZE; | |
720 | ||
721 | rcu_read_lock(); | |
722 | ||
723 | read_lock_bh(&sec->lock); | |
724 | ||
725 | if (!sec->params.enabled) { | |
726 | rc = -EINVAL; | |
727 | goto fail_read; | |
728 | } | |
729 | ||
730 | key = llsec_lookup_key(sec, &hdr, &hdr.dest, NULL); | |
731 | if (!key) { | |
732 | rc = -ENOKEY; | |
733 | goto fail_read; | |
734 | } | |
735 | ||
736 | read_unlock_bh(&sec->lock); | |
737 | ||
738 | write_lock_bh(&sec->lock); | |
739 | ||
740 | frame_ctr = be32_to_cpu(sec->params.frame_counter); | |
741 | hdr.sec.frame_counter = cpu_to_le32(frame_ctr); | |
742 | if (frame_ctr == 0xFFFFFFFF) { | |
743 | write_unlock_bh(&sec->lock); | |
744 | llsec_key_put(key); | |
745 | rc = -EOVERFLOW; | |
746 | goto fail; | |
747 | } | |
748 | ||
749 | sec->params.frame_counter = cpu_to_be32(frame_ctr + 1); | |
750 | ||
751 | write_unlock_bh(&sec->lock); | |
752 | ||
753 | rcu_read_unlock(); | |
754 | ||
755 | skb->mac_len = ieee802154_hdr_push(skb, &hdr); | |
756 | skb_reset_mac_header(skb); | |
757 | ||
758 | rc = llsec_do_encrypt(skb, sec, &hdr, key); | |
759 | llsec_key_put(key); | |
760 | ||
62e9c117 | 761 | return rc; |
03556e4d PB |
762 | |
763 | fail_read: | |
6f3eabcd | 764 | read_unlock_bh(&sec->lock); |
03556e4d PB |
765 | fail: |
766 | rcu_read_unlock(); | |
767 | return rc; | |
768 | } | |
4c14a2fb | 769 | |
4c14a2fb PB |
770 | static struct mac802154_llsec_device* |
771 | llsec_lookup_dev(struct mac802154_llsec *sec, | |
772 | const struct ieee802154_addr *addr) | |
773 | { | |
774 | struct ieee802154_addr devaddr = *addr; | |
775 | struct mac802154_llsec_device *dev = NULL; | |
776 | ||
777 | if (devaddr.mode == IEEE802154_ADDR_NONE && | |
778 | llsec_recover_addr(sec, &devaddr) < 0) | |
779 | return NULL; | |
780 | ||
781 | if (devaddr.mode == IEEE802154_ADDR_SHORT) { | |
782 | u32 key = llsec_dev_hash_short(devaddr.short_addr, | |
783 | devaddr.pan_id); | |
784 | ||
785 | hash_for_each_possible_rcu(sec->devices_short, dev, | |
786 | bucket_s, key) { | |
787 | if (dev->dev.pan_id == devaddr.pan_id && | |
788 | dev->dev.short_addr == devaddr.short_addr) | |
789 | return dev; | |
790 | } | |
791 | } else { | |
792 | u64 key = llsec_dev_hash_long(devaddr.extended_addr); | |
793 | ||
794 | hash_for_each_possible_rcu(sec->devices_hw, dev, | |
795 | bucket_hw, key) { | |
796 | if (dev->dev.hwaddr == devaddr.extended_addr) | |
797 | return dev; | |
798 | } | |
799 | } | |
800 | ||
801 | return NULL; | |
802 | } | |
803 | ||
804 | static int | |
805 | llsec_lookup_seclevel(const struct mac802154_llsec *sec, | |
806 | u8 frame_type, u8 cmd_frame_id, | |
807 | struct ieee802154_llsec_seclevel *rlevel) | |
808 | { | |
809 | struct ieee802154_llsec_seclevel *level; | |
810 | ||
811 | list_for_each_entry_rcu(level, &sec->table.security_levels, list) { | |
812 | if (level->frame_type == frame_type && | |
813 | (frame_type != IEEE802154_FC_TYPE_MAC_CMD || | |
814 | level->cmd_frame_id == cmd_frame_id)) { | |
815 | *rlevel = *level; | |
816 | return 0; | |
817 | } | |
818 | } | |
819 | ||
820 | return -EINVAL; | |
821 | } | |
822 | ||
823 | static int | |
824 | llsec_do_decrypt_unauth(struct sk_buff *skb, const struct mac802154_llsec *sec, | |
825 | const struct ieee802154_hdr *hdr, | |
826 | struct mac802154_llsec_key *key, __le64 dev_addr) | |
827 | { | |
828 | u8 iv[16]; | |
829 | unsigned char *data; | |
830 | int datalen; | |
831 | struct scatterlist src; | |
832 | struct blkcipher_desc req = { | |
833 | .tfm = key->tfm0, | |
834 | .info = iv, | |
835 | .flags = 0, | |
836 | }; | |
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 | ||
844 | return crypto_blkcipher_decrypt_iv(&req, &src, &src, datalen); | |
845 | } | |
846 | ||
847 | static int | |
848 | llsec_do_decrypt_auth(struct sk_buff *skb, const struct mac802154_llsec *sec, | |
849 | const struct ieee802154_hdr *hdr, | |
850 | struct mac802154_llsec_key *key, __le64 dev_addr) | |
851 | { | |
852 | u8 iv[16]; | |
853 | unsigned char *data; | |
854 | int authlen, datalen, assoclen, rc; | |
25528fda | 855 | struct scatterlist sg; |
4c14a2fb PB |
856 | struct aead_request *req; |
857 | ||
858 | authlen = ieee802154_sechdr_authtag_len(&hdr->sec); | |
859 | llsec_geniv(iv, dev_addr, &hdr->sec); | |
860 | ||
861 | req = aead_request_alloc(llsec_tfm_by_len(key, authlen), GFP_ATOMIC); | |
862 | if (!req) | |
863 | return -ENOMEM; | |
864 | ||
4c14a2fb PB |
865 | assoclen = skb->mac_len; |
866 | ||
867 | data = skb_mac_header(skb) + skb->mac_len; | |
868 | datalen = skb_tail_pointer(skb) - data; | |
869 | ||
25528fda HX |
870 | sg_init_one(&sg, skb_mac_header(skb), assoclen + datalen); |
871 | ||
872 | if (!(hdr->sec.level & IEEE802154_SCF_SECLEVEL_ENC)) { | |
4c14a2fb | 873 | assoclen += datalen - authlen; |
4c14a2fb PB |
874 | datalen = authlen; |
875 | } | |
876 | ||
4c14a2fb | 877 | aead_request_set_callback(req, 0, NULL, NULL); |
25528fda HX |
878 | aead_request_set_crypt(req, &sg, &sg, datalen, iv); |
879 | aead_request_set_ad(req, assoclen); | |
4c14a2fb PB |
880 | |
881 | rc = crypto_aead_decrypt(req); | |
882 | ||
883 | kfree(req); | |
884 | skb_trim(skb, skb->len - authlen); | |
885 | ||
886 | return rc; | |
887 | } | |
888 | ||
889 | static int | |
890 | llsec_do_decrypt(struct sk_buff *skb, const struct mac802154_llsec *sec, | |
891 | const struct ieee802154_hdr *hdr, | |
892 | struct mac802154_llsec_key *key, __le64 dev_addr) | |
893 | { | |
894 | if (hdr->sec.level == IEEE802154_SCF_SECLEVEL_ENC) | |
895 | return llsec_do_decrypt_unauth(skb, sec, hdr, key, dev_addr); | |
896 | else | |
897 | return llsec_do_decrypt_auth(skb, sec, hdr, key, dev_addr); | |
898 | } | |
899 | ||
f0f77dc6 PB |
900 | static int |
901 | llsec_update_devkey_record(struct mac802154_llsec_device *dev, | |
902 | const struct ieee802154_llsec_key_id *in_key) | |
903 | { | |
904 | struct mac802154_llsec_device_key *devkey; | |
905 | ||
906 | devkey = llsec_devkey_find(dev, in_key); | |
907 | ||
908 | if (!devkey) { | |
909 | struct mac802154_llsec_device_key *next; | |
910 | ||
911 | next = kzalloc(sizeof(*devkey), GFP_ATOMIC); | |
912 | if (!next) | |
913 | return -ENOMEM; | |
914 | ||
915 | next->devkey.key_id = *in_key; | |
916 | ||
917 | spin_lock_bh(&dev->lock); | |
918 | ||
919 | devkey = llsec_devkey_find(dev, in_key); | |
920 | if (!devkey) | |
921 | list_add_rcu(&next->devkey.list, &dev->dev.keys); | |
922 | else | |
923 | kfree(next); | |
924 | ||
925 | spin_unlock_bh(&dev->lock); | |
926 | } | |
927 | ||
928 | return 0; | |
929 | } | |
930 | ||
4c14a2fb PB |
931 | static int |
932 | llsec_update_devkey_info(struct mac802154_llsec_device *dev, | |
933 | const struct ieee802154_llsec_key_id *in_key, | |
934 | u32 frame_counter) | |
935 | { | |
936 | struct mac802154_llsec_device_key *devkey = NULL; | |
937 | ||
938 | if (dev->dev.key_mode == IEEE802154_LLSEC_DEVKEY_RESTRICT) { | |
939 | devkey = llsec_devkey_find(dev, in_key); | |
940 | if (!devkey) | |
941 | return -ENOENT; | |
942 | } | |
943 | ||
f0f77dc6 PB |
944 | if (dev->dev.key_mode == IEEE802154_LLSEC_DEVKEY_RECORD) { |
945 | int rc = llsec_update_devkey_record(dev, in_key); | |
946 | ||
947 | if (rc < 0) | |
948 | return rc; | |
949 | } | |
950 | ||
4c14a2fb PB |
951 | spin_lock_bh(&dev->lock); |
952 | ||
953 | if ((!devkey && frame_counter < dev->dev.frame_counter) || | |
954 | (devkey && frame_counter < devkey->devkey.frame_counter)) { | |
955 | spin_unlock_bh(&dev->lock); | |
956 | return -EINVAL; | |
957 | } | |
958 | ||
959 | if (devkey) | |
960 | devkey->devkey.frame_counter = frame_counter + 1; | |
961 | else | |
962 | dev->dev.frame_counter = frame_counter + 1; | |
963 | ||
964 | spin_unlock_bh(&dev->lock); | |
965 | ||
966 | return 0; | |
967 | } | |
968 | ||
969 | int mac802154_llsec_decrypt(struct mac802154_llsec *sec, struct sk_buff *skb) | |
970 | { | |
971 | struct ieee802154_hdr hdr; | |
972 | struct mac802154_llsec_key *key; | |
973 | struct ieee802154_llsec_key_id key_id; | |
974 | struct mac802154_llsec_device *dev; | |
975 | struct ieee802154_llsec_seclevel seclevel; | |
976 | int err; | |
977 | __le64 dev_addr; | |
978 | u32 frame_ctr; | |
979 | ||
980 | if (ieee802154_hdr_peek(skb, &hdr) < 0) | |
981 | return -EINVAL; | |
982 | if (!hdr.fc.security_enabled) | |
983 | return 0; | |
984 | if (hdr.fc.version == 0) | |
985 | return -EINVAL; | |
986 | ||
987 | read_lock_bh(&sec->lock); | |
988 | if (!sec->params.enabled) { | |
989 | read_unlock_bh(&sec->lock); | |
990 | return -EINVAL; | |
991 | } | |
992 | read_unlock_bh(&sec->lock); | |
993 | ||
994 | rcu_read_lock(); | |
995 | ||
996 | key = llsec_lookup_key(sec, &hdr, &hdr.source, &key_id); | |
997 | if (!key) { | |
998 | err = -ENOKEY; | |
999 | goto fail; | |
1000 | } | |
1001 | ||
1002 | dev = llsec_lookup_dev(sec, &hdr.source); | |
1003 | if (!dev) { | |
1004 | err = -EINVAL; | |
1005 | goto fail_dev; | |
1006 | } | |
1007 | ||
1008 | if (llsec_lookup_seclevel(sec, hdr.fc.type, 0, &seclevel) < 0) { | |
1009 | err = -EINVAL; | |
1010 | goto fail_dev; | |
1011 | } | |
1012 | ||
1013 | if (!(seclevel.sec_levels & BIT(hdr.sec.level)) && | |
1014 | (hdr.sec.level == 0 && seclevel.device_override && | |
1015 | !dev->dev.seclevel_exempt)) { | |
1016 | err = -EINVAL; | |
1017 | goto fail_dev; | |
1018 | } | |
1019 | ||
1020 | frame_ctr = le32_to_cpu(hdr.sec.frame_counter); | |
1021 | ||
1022 | if (frame_ctr == 0xffffffff) { | |
1023 | err = -EOVERFLOW; | |
1024 | goto fail_dev; | |
1025 | } | |
1026 | ||
1027 | err = llsec_update_devkey_info(dev, &key_id, frame_ctr); | |
1028 | if (err) | |
1029 | goto fail_dev; | |
1030 | ||
1031 | dev_addr = dev->dev.hwaddr; | |
1032 | ||
1033 | rcu_read_unlock(); | |
1034 | ||
1035 | err = llsec_do_decrypt(skb, sec, &hdr, key, dev_addr); | |
1036 | llsec_key_put(key); | |
1037 | return err; | |
1038 | ||
1039 | fail_dev: | |
1040 | llsec_key_put(key); | |
1041 | fail: | |
1042 | rcu_read_unlock(); | |
1043 | return err; | |
1044 | } |