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Commit | Line | Data |
---|---|---|
cce9e06d HX |
1 | /* |
2 | * Cryptographic API for algorithms (i.e., low-level API). | |
3 | * | |
4 | * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the Free | |
8 | * Software Foundation; either version 2 of the License, or (at your option) | |
9 | * any later version. | |
10 | * | |
11 | */ | |
12 | ||
6bfd4809 | 13 | #include <linux/err.h> |
cce9e06d HX |
14 | #include <linux/errno.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/kernel.h> | |
4cc7720c | 17 | #include <linux/list.h> |
cce9e06d | 18 | #include <linux/module.h> |
7fed0bf2 | 19 | #include <linux/rtnetlink.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
cce9e06d HX |
21 | #include <linux/string.h> |
22 | ||
23 | #include "internal.h" | |
24 | ||
4cc7720c HX |
25 | static LIST_HEAD(crypto_template_list); |
26 | ||
cce9e06d HX |
27 | static inline int crypto_set_driver_name(struct crypto_alg *alg) |
28 | { | |
29 | static const char suffix[] = "-generic"; | |
30 | char *driver_name = alg->cra_driver_name; | |
31 | int len; | |
32 | ||
33 | if (*driver_name) | |
34 | return 0; | |
35 | ||
36 | len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); | |
37 | if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME) | |
38 | return -ENAMETOOLONG; | |
39 | ||
40 | memcpy(driver_name + len, suffix, sizeof(suffix)); | |
41 | return 0; | |
42 | } | |
43 | ||
4cc7720c | 44 | static int crypto_check_alg(struct crypto_alg *alg) |
cce9e06d | 45 | { |
cce9e06d HX |
46 | if (alg->cra_alignmask & (alg->cra_alignmask + 1)) |
47 | return -EINVAL; | |
48 | ||
cce9e06d HX |
49 | if (alg->cra_blocksize > PAGE_SIZE / 8) |
50 | return -EINVAL; | |
51 | ||
52 | if (alg->cra_priority < 0) | |
53 | return -EINVAL; | |
cce9e06d | 54 | |
4cc7720c HX |
55 | return crypto_set_driver_name(alg); |
56 | } | |
57 | ||
6bfd4809 HX |
58 | static void crypto_destroy_instance(struct crypto_alg *alg) |
59 | { | |
60 | struct crypto_instance *inst = (void *)alg; | |
61 | struct crypto_template *tmpl = inst->tmpl; | |
62 | ||
63 | tmpl->free(inst); | |
64 | crypto_tmpl_put(tmpl); | |
65 | } | |
66 | ||
2bf29016 HX |
67 | static struct list_head *crypto_more_spawns(struct crypto_alg *alg, |
68 | struct list_head *stack, | |
69 | struct list_head *top, | |
70 | struct list_head *secondary_spawns) | |
71 | { | |
72 | struct crypto_spawn *spawn, *n; | |
73 | ||
74 | if (list_empty(stack)) | |
75 | return NULL; | |
76 | ||
77 | spawn = list_first_entry(stack, struct crypto_spawn, list); | |
78 | n = list_entry(spawn->list.next, struct crypto_spawn, list); | |
79 | ||
80 | if (spawn->alg && &n->list != stack && !n->alg) | |
81 | n->alg = (n->list.next == stack) ? alg : | |
82 | &list_entry(n->list.next, struct crypto_spawn, | |
83 | list)->inst->alg; | |
84 | ||
85 | list_move(&spawn->list, secondary_spawns); | |
86 | ||
87 | return &n->list == stack ? top : &n->inst->alg.cra_users; | |
88 | } | |
89 | ||
a73e6996 | 90 | static void crypto_remove_spawn(struct crypto_spawn *spawn, |
2bf29016 | 91 | struct list_head *list) |
6bfd4809 | 92 | { |
a73e6996 HX |
93 | struct crypto_instance *inst = spawn->inst; |
94 | struct crypto_template *tmpl = inst->tmpl; | |
6bfd4809 | 95 | |
a73e6996 HX |
96 | if (crypto_is_dead(&inst->alg)) |
97 | return; | |
6bfd4809 | 98 | |
a73e6996 | 99 | inst->alg.cra_flags |= CRYPTO_ALG_DEAD; |
38cb2419 HX |
100 | if (hlist_unhashed(&inst->list)) |
101 | return; | |
102 | ||
a73e6996 HX |
103 | if (!tmpl || !crypto_tmpl_get(tmpl)) |
104 | return; | |
105 | ||
106 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg); | |
107 | list_move(&inst->alg.cra_list, list); | |
108 | hlist_del(&inst->list); | |
109 | inst->alg.cra_destroy = crypto_destroy_instance; | |
110 | ||
2bf29016 | 111 | BUG_ON(!list_empty(&inst->alg.cra_users)); |
a73e6996 HX |
112 | } |
113 | ||
89b596ba SK |
114 | void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list, |
115 | struct crypto_alg *nalg) | |
a73e6996 | 116 | { |
2bf29016 | 117 | u32 new_type = (nalg ?: alg)->cra_flags; |
a73e6996 HX |
118 | struct crypto_spawn *spawn, *n; |
119 | LIST_HEAD(secondary_spawns); | |
2bf29016 HX |
120 | struct list_head *spawns; |
121 | LIST_HEAD(stack); | |
122 | LIST_HEAD(top); | |
6bfd4809 | 123 | |
2bf29016 | 124 | spawns = &alg->cra_users; |
a73e6996 HX |
125 | list_for_each_entry_safe(spawn, n, spawns, list) { |
126 | if ((spawn->alg->cra_flags ^ new_type) & spawn->mask) | |
6bfd4809 HX |
127 | continue; |
128 | ||
2bf29016 | 129 | list_move(&spawn->list, &top); |
a73e6996 | 130 | } |
6bfd4809 | 131 | |
2bf29016 HX |
132 | spawns = ⊤ |
133 | do { | |
134 | while (!list_empty(spawns)) { | |
135 | struct crypto_instance *inst; | |
136 | ||
137 | spawn = list_first_entry(spawns, struct crypto_spawn, | |
138 | list); | |
139 | inst = spawn->inst; | |
140 | ||
141 | BUG_ON(&inst->alg == alg); | |
142 | ||
143 | list_move(&spawn->list, &stack); | |
144 | ||
145 | if (&inst->alg == nalg) | |
146 | break; | |
147 | ||
148 | spawn->alg = NULL; | |
149 | spawns = &inst->alg.cra_users; | |
1caf418c EB |
150 | |
151 | /* | |
152 | * We may encounter an unregistered instance here, since | |
153 | * an instance's spawns are set up prior to the instance | |
154 | * being registered. An unregistered instance will have | |
155 | * NULL ->cra_users.next, since ->cra_users isn't | |
156 | * properly initialized until registration. But an | |
157 | * unregistered instance cannot have any users, so treat | |
158 | * it the same as ->cra_users being empty. | |
159 | */ | |
160 | if (spawns->next == NULL) | |
161 | break; | |
2bf29016 HX |
162 | } |
163 | } while ((spawns = crypto_more_spawns(alg, &stack, &top, | |
164 | &secondary_spawns))); | |
165 | ||
166 | list_for_each_entry_safe(spawn, n, &secondary_spawns, list) { | |
167 | if (spawn->alg) | |
168 | list_move(&spawn->list, &spawn->alg->cra_users); | |
169 | else | |
170 | crypto_remove_spawn(spawn, list); | |
6bfd4809 HX |
171 | } |
172 | } | |
89b596ba | 173 | EXPORT_SYMBOL_GPL(crypto_remove_spawns); |
6bfd4809 | 174 | |
73d3864a | 175 | static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg) |
4cc7720c HX |
176 | { |
177 | struct crypto_alg *q; | |
73d3864a | 178 | struct crypto_larval *larval; |
6bfd4809 HX |
179 | int ret = -EAGAIN; |
180 | ||
181 | if (crypto_is_dead(alg)) | |
73d3864a | 182 | goto err; |
6bfd4809 HX |
183 | |
184 | INIT_LIST_HEAD(&alg->cra_users); | |
185 | ||
73d3864a HX |
186 | /* No cheating! */ |
187 | alg->cra_flags &= ~CRYPTO_ALG_TESTED; | |
188 | ||
6bfd4809 | 189 | ret = -EEXIST; |
4cc7720c | 190 | |
2825982d | 191 | atomic_set(&alg->cra_refcnt, 1); |
cce9e06d | 192 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
4cc7720c | 193 | if (q == alg) |
73d3864a HX |
194 | goto err; |
195 | ||
b8e15992 HX |
196 | if (crypto_is_moribund(q)) |
197 | continue; | |
198 | ||
73d3864a HX |
199 | if (crypto_is_larval(q)) { |
200 | if (!strcmp(alg->cra_driver_name, q->cra_driver_name)) | |
201 | goto err; | |
202 | continue; | |
203 | } | |
204 | ||
205 | if (!strcmp(q->cra_driver_name, alg->cra_name) || | |
206 | !strcmp(q->cra_name, alg->cra_driver_name)) | |
207 | goto err; | |
208 | } | |
209 | ||
210 | larval = crypto_larval_alloc(alg->cra_name, | |
211 | alg->cra_flags | CRYPTO_ALG_TESTED, 0); | |
212 | if (IS_ERR(larval)) | |
213 | goto out; | |
214 | ||
215 | ret = -ENOENT; | |
216 | larval->adult = crypto_mod_get(alg); | |
217 | if (!larval->adult) | |
218 | goto free_larval; | |
219 | ||
220 | atomic_set(&larval->alg.cra_refcnt, 1); | |
221 | memcpy(larval->alg.cra_driver_name, alg->cra_driver_name, | |
222 | CRYPTO_MAX_ALG_NAME); | |
223 | larval->alg.cra_priority = alg->cra_priority; | |
224 | ||
225 | list_add(&alg->cra_list, &crypto_alg_list); | |
226 | list_add(&larval->alg.cra_list, &crypto_alg_list); | |
227 | ||
5357c6c4 | 228 | out: |
73d3864a HX |
229 | return larval; |
230 | ||
231 | free_larval: | |
232 | kfree(larval); | |
233 | err: | |
234 | larval = ERR_PTR(ret); | |
235 | goto out; | |
236 | } | |
237 | ||
238 | void crypto_alg_tested(const char *name, int err) | |
239 | { | |
240 | struct crypto_larval *test; | |
241 | struct crypto_alg *alg; | |
242 | struct crypto_alg *q; | |
243 | LIST_HEAD(list); | |
244 | ||
245 | down_write(&crypto_alg_sem); | |
246 | list_for_each_entry(q, &crypto_alg_list, cra_list) { | |
b8e15992 | 247 | if (crypto_is_moribund(q) || !crypto_is_larval(q)) |
73d3864a HX |
248 | continue; |
249 | ||
250 | test = (struct crypto_larval *)q; | |
251 | ||
252 | if (!strcmp(q->cra_driver_name, name)) | |
253 | goto found; | |
254 | } | |
255 | ||
256 | printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err); | |
257 | goto unlock; | |
258 | ||
259 | found: | |
b8e15992 | 260 | q->cra_flags |= CRYPTO_ALG_DEAD; |
73d3864a HX |
261 | alg = test->adult; |
262 | if (err || list_empty(&alg->cra_list)) | |
263 | goto complete; | |
264 | ||
265 | alg->cra_flags |= CRYPTO_ALG_TESTED; | |
266 | ||
267 | list_for_each_entry(q, &crypto_alg_list, cra_list) { | |
268 | if (q == alg) | |
269 | continue; | |
6bfd4809 HX |
270 | |
271 | if (crypto_is_moribund(q)) | |
272 | continue; | |
273 | ||
274 | if (crypto_is_larval(q)) { | |
2825982d HX |
275 | struct crypto_larval *larval = (void *)q; |
276 | ||
d8058480 HX |
277 | /* |
278 | * Check to see if either our generic name or | |
279 | * specific name can satisfy the name requested | |
280 | * by the larval entry q. | |
281 | */ | |
6bfd4809 HX |
282 | if (strcmp(alg->cra_name, q->cra_name) && |
283 | strcmp(alg->cra_driver_name, q->cra_name)) | |
284 | continue; | |
285 | ||
286 | if (larval->adult) | |
287 | continue; | |
492e2b63 HX |
288 | if ((q->cra_flags ^ alg->cra_flags) & larval->mask) |
289 | continue; | |
2825982d HX |
290 | if (!crypto_mod_get(alg)) |
291 | continue; | |
6bfd4809 | 292 | |
2825982d | 293 | larval->adult = alg; |
6bfd4809 | 294 | continue; |
2825982d | 295 | } |
6bfd4809 HX |
296 | |
297 | if (strcmp(alg->cra_name, q->cra_name)) | |
298 | continue; | |
299 | ||
300 | if (strcmp(alg->cra_driver_name, q->cra_driver_name) && | |
301 | q->cra_priority > alg->cra_priority) | |
302 | continue; | |
303 | ||
2bf29016 | 304 | crypto_remove_spawns(q, &list, alg); |
cce9e06d | 305 | } |
2825982d | 306 | |
73d3864a HX |
307 | complete: |
308 | complete_all(&test->completion); | |
2825982d | 309 | |
73d3864a HX |
310 | unlock: |
311 | up_write(&crypto_alg_sem); | |
312 | ||
313 | crypto_remove_final(&list); | |
cce9e06d | 314 | } |
73d3864a | 315 | EXPORT_SYMBOL_GPL(crypto_alg_tested); |
4cc7720c | 316 | |
22e5b20b | 317 | void crypto_remove_final(struct list_head *list) |
6bfd4809 HX |
318 | { |
319 | struct crypto_alg *alg; | |
320 | struct crypto_alg *n; | |
321 | ||
322 | list_for_each_entry_safe(alg, n, list, cra_list) { | |
323 | list_del_init(&alg->cra_list); | |
324 | crypto_alg_put(alg); | |
325 | } | |
326 | } | |
22e5b20b | 327 | EXPORT_SYMBOL_GPL(crypto_remove_final); |
6bfd4809 | 328 | |
73d3864a HX |
329 | static void crypto_wait_for_test(struct crypto_larval *larval) |
330 | { | |
331 | int err; | |
332 | ||
333 | err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult); | |
334 | if (err != NOTIFY_STOP) { | |
335 | if (WARN_ON(err != NOTIFY_DONE)) | |
336 | goto out; | |
337 | crypto_alg_tested(larval->alg.cra_driver_name, 0); | |
338 | } | |
339 | ||
b5d9cdc9 | 340 | err = wait_for_completion_killable(&larval->completion); |
73d3864a HX |
341 | WARN_ON(err); |
342 | ||
343 | out: | |
344 | crypto_larval_kill(&larval->alg); | |
345 | } | |
346 | ||
4cc7720c HX |
347 | int crypto_register_alg(struct crypto_alg *alg) |
348 | { | |
73d3864a | 349 | struct crypto_larval *larval; |
4cc7720c HX |
350 | int err; |
351 | ||
3ae51b03 | 352 | alg->cra_flags &= ~CRYPTO_ALG_DEAD; |
4cc7720c HX |
353 | err = crypto_check_alg(alg); |
354 | if (err) | |
355 | return err; | |
356 | ||
357 | down_write(&crypto_alg_sem); | |
73d3864a | 358 | larval = __crypto_register_alg(alg); |
4cc7720c HX |
359 | up_write(&crypto_alg_sem); |
360 | ||
73d3864a HX |
361 | if (IS_ERR(larval)) |
362 | return PTR_ERR(larval); | |
363 | ||
364 | crypto_wait_for_test(larval); | |
365 | return 0; | |
4cc7720c | 366 | } |
cce9e06d HX |
367 | EXPORT_SYMBOL_GPL(crypto_register_alg); |
368 | ||
6bfd4809 HX |
369 | static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list) |
370 | { | |
371 | if (unlikely(list_empty(&alg->cra_list))) | |
372 | return -ENOENT; | |
373 | ||
374 | alg->cra_flags |= CRYPTO_ALG_DEAD; | |
375 | ||
376 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg); | |
377 | list_del_init(&alg->cra_list); | |
2bf29016 | 378 | crypto_remove_spawns(alg, list, NULL); |
6bfd4809 HX |
379 | |
380 | return 0; | |
381 | } | |
382 | ||
cce9e06d HX |
383 | int crypto_unregister_alg(struct crypto_alg *alg) |
384 | { | |
6bfd4809 HX |
385 | int ret; |
386 | LIST_HEAD(list); | |
5357c6c4 | 387 | |
cce9e06d | 388 | down_write(&crypto_alg_sem); |
6bfd4809 | 389 | ret = crypto_remove_alg(alg, &list); |
cce9e06d HX |
390 | up_write(&crypto_alg_sem); |
391 | ||
392 | if (ret) | |
393 | return ret; | |
394 | ||
395 | BUG_ON(atomic_read(&alg->cra_refcnt) != 1); | |
396 | if (alg->cra_destroy) | |
397 | alg->cra_destroy(alg); | |
398 | ||
6bfd4809 | 399 | crypto_remove_final(&list); |
cce9e06d HX |
400 | return 0; |
401 | } | |
402 | EXPORT_SYMBOL_GPL(crypto_unregister_alg); | |
403 | ||
4b004346 MB |
404 | int crypto_register_algs(struct crypto_alg *algs, int count) |
405 | { | |
406 | int i, ret; | |
407 | ||
408 | for (i = 0; i < count; i++) { | |
409 | ret = crypto_register_alg(&algs[i]); | |
410 | if (ret) | |
411 | goto err; | |
412 | } | |
413 | ||
414 | return 0; | |
415 | ||
416 | err: | |
417 | for (--i; i >= 0; --i) | |
418 | crypto_unregister_alg(&algs[i]); | |
419 | ||
420 | return ret; | |
421 | } | |
422 | EXPORT_SYMBOL_GPL(crypto_register_algs); | |
423 | ||
424 | int crypto_unregister_algs(struct crypto_alg *algs, int count) | |
425 | { | |
426 | int i, ret; | |
427 | ||
428 | for (i = 0; i < count; i++) { | |
429 | ret = crypto_unregister_alg(&algs[i]); | |
430 | if (ret) | |
431 | pr_err("Failed to unregister %s %s: %d\n", | |
432 | algs[i].cra_driver_name, algs[i].cra_name, ret); | |
433 | } | |
434 | ||
435 | return 0; | |
436 | } | |
437 | EXPORT_SYMBOL_GPL(crypto_unregister_algs); | |
438 | ||
4cc7720c HX |
439 | int crypto_register_template(struct crypto_template *tmpl) |
440 | { | |
441 | struct crypto_template *q; | |
442 | int err = -EEXIST; | |
443 | ||
444 | down_write(&crypto_alg_sem); | |
445 | ||
446 | list_for_each_entry(q, &crypto_template_list, list) { | |
447 | if (q == tmpl) | |
448 | goto out; | |
449 | } | |
450 | ||
451 | list_add(&tmpl->list, &crypto_template_list); | |
2825982d | 452 | crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl); |
4cc7720c HX |
453 | err = 0; |
454 | out: | |
455 | up_write(&crypto_alg_sem); | |
456 | return err; | |
457 | } | |
458 | EXPORT_SYMBOL_GPL(crypto_register_template); | |
459 | ||
460 | void crypto_unregister_template(struct crypto_template *tmpl) | |
461 | { | |
462 | struct crypto_instance *inst; | |
b67bfe0d | 463 | struct hlist_node *n; |
4cc7720c | 464 | struct hlist_head *list; |
6bfd4809 | 465 | LIST_HEAD(users); |
4cc7720c HX |
466 | |
467 | down_write(&crypto_alg_sem); | |
468 | ||
469 | BUG_ON(list_empty(&tmpl->list)); | |
470 | list_del_init(&tmpl->list); | |
471 | ||
472 | list = &tmpl->instances; | |
b67bfe0d | 473 | hlist_for_each_entry(inst, list, list) { |
6bfd4809 HX |
474 | int err = crypto_remove_alg(&inst->alg, &users); |
475 | BUG_ON(err); | |
4cc7720c HX |
476 | } |
477 | ||
2825982d HX |
478 | crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl); |
479 | ||
4cc7720c HX |
480 | up_write(&crypto_alg_sem); |
481 | ||
b67bfe0d | 482 | hlist_for_each_entry_safe(inst, n, list, list) { |
4cc7720c HX |
483 | BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1); |
484 | tmpl->free(inst); | |
485 | } | |
6bfd4809 | 486 | crypto_remove_final(&users); |
4cc7720c HX |
487 | } |
488 | EXPORT_SYMBOL_GPL(crypto_unregister_template); | |
489 | ||
490 | static struct crypto_template *__crypto_lookup_template(const char *name) | |
491 | { | |
492 | struct crypto_template *q, *tmpl = NULL; | |
493 | ||
494 | down_read(&crypto_alg_sem); | |
495 | list_for_each_entry(q, &crypto_template_list, list) { | |
496 | if (strcmp(q->name, name)) | |
497 | continue; | |
498 | if (unlikely(!crypto_tmpl_get(q))) | |
499 | continue; | |
500 | ||
501 | tmpl = q; | |
502 | break; | |
503 | } | |
504 | up_read(&crypto_alg_sem); | |
505 | ||
506 | return tmpl; | |
507 | } | |
508 | ||
509 | struct crypto_template *crypto_lookup_template(const char *name) | |
510 | { | |
9f213efc KC |
511 | return try_then_request_module(__crypto_lookup_template(name), |
512 | "crypto-%s", name); | |
4cc7720c HX |
513 | } |
514 | EXPORT_SYMBOL_GPL(crypto_lookup_template); | |
515 | ||
516 | int crypto_register_instance(struct crypto_template *tmpl, | |
517 | struct crypto_instance *inst) | |
518 | { | |
73d3864a HX |
519 | struct crypto_larval *larval; |
520 | int err; | |
4cc7720c | 521 | |
4cc7720c HX |
522 | err = crypto_check_alg(&inst->alg); |
523 | if (err) | |
524 | goto err; | |
525 | ||
526 | inst->alg.cra_module = tmpl->module; | |
64a947b1 | 527 | inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE; |
4cc7720c HX |
528 | |
529 | down_write(&crypto_alg_sem); | |
530 | ||
73d3864a HX |
531 | larval = __crypto_register_alg(&inst->alg); |
532 | if (IS_ERR(larval)) | |
4cc7720c HX |
533 | goto unlock; |
534 | ||
535 | hlist_add_head(&inst->list, &tmpl->instances); | |
536 | inst->tmpl = tmpl; | |
537 | ||
538 | unlock: | |
539 | up_write(&crypto_alg_sem); | |
540 | ||
73d3864a HX |
541 | err = PTR_ERR(larval); |
542 | if (IS_ERR(larval)) | |
543 | goto err; | |
544 | ||
545 | crypto_wait_for_test(larval); | |
546 | err = 0; | |
6bfd4809 | 547 | |
4cc7720c HX |
548 | err: |
549 | return err; | |
550 | } | |
551 | EXPORT_SYMBOL_GPL(crypto_register_instance); | |
ce3fd840 SK |
552 | |
553 | int crypto_unregister_instance(struct crypto_alg *alg) | |
554 | { | |
555 | int err; | |
556 | struct crypto_instance *inst = (void *)alg; | |
557 | struct crypto_template *tmpl = inst->tmpl; | |
558 | LIST_HEAD(users); | |
559 | ||
560 | if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE)) | |
561 | return -EINVAL; | |
562 | ||
563 | BUG_ON(atomic_read(&alg->cra_refcnt) != 1); | |
564 | ||
565 | down_write(&crypto_alg_sem); | |
566 | ||
567 | hlist_del_init(&inst->list); | |
568 | err = crypto_remove_alg(alg, &users); | |
569 | ||
570 | up_write(&crypto_alg_sem); | |
571 | ||
572 | if (err) | |
573 | return err; | |
574 | ||
575 | tmpl->free(inst); | |
576 | crypto_remove_final(&users); | |
577 | ||
578 | return 0; | |
579 | } | |
580 | EXPORT_SYMBOL_GPL(crypto_unregister_instance); | |
4cc7720c | 581 | |
6bfd4809 | 582 | int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, |
a73e6996 | 583 | struct crypto_instance *inst, u32 mask) |
6bfd4809 HX |
584 | { |
585 | int err = -EAGAIN; | |
586 | ||
587 | spawn->inst = inst; | |
a73e6996 | 588 | spawn->mask = mask; |
6bfd4809 HX |
589 | |
590 | down_write(&crypto_alg_sem); | |
591 | if (!crypto_is_moribund(alg)) { | |
592 | list_add(&spawn->list, &alg->cra_users); | |
593 | spawn->alg = alg; | |
594 | err = 0; | |
595 | } | |
596 | up_write(&crypto_alg_sem); | |
597 | ||
598 | return err; | |
599 | } | |
600 | EXPORT_SYMBOL_GPL(crypto_init_spawn); | |
601 | ||
97eedce1 HX |
602 | int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg, |
603 | struct crypto_instance *inst, | |
604 | const struct crypto_type *frontend) | |
605 | { | |
606 | int err = -EINVAL; | |
607 | ||
c614e109 | 608 | if ((alg->cra_flags ^ frontend->type) & frontend->maskset) |
97eedce1 HX |
609 | goto out; |
610 | ||
611 | spawn->frontend = frontend; | |
612 | err = crypto_init_spawn(spawn, alg, inst, frontend->maskset); | |
613 | ||
614 | out: | |
615 | return err; | |
616 | } | |
617 | EXPORT_SYMBOL_GPL(crypto_init_spawn2); | |
618 | ||
6bfd4809 HX |
619 | void crypto_drop_spawn(struct crypto_spawn *spawn) |
620 | { | |
7ede5a5b HX |
621 | if (!spawn->alg) |
622 | return; | |
623 | ||
6bfd4809 HX |
624 | down_write(&crypto_alg_sem); |
625 | list_del(&spawn->list); | |
626 | up_write(&crypto_alg_sem); | |
627 | } | |
628 | EXPORT_SYMBOL_GPL(crypto_drop_spawn); | |
629 | ||
97eedce1 | 630 | static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn) |
6bfd4809 HX |
631 | { |
632 | struct crypto_alg *alg; | |
633 | struct crypto_alg *alg2; | |
6bfd4809 HX |
634 | |
635 | down_read(&crypto_alg_sem); | |
636 | alg = spawn->alg; | |
637 | alg2 = alg; | |
638 | if (alg2) | |
639 | alg2 = crypto_mod_get(alg2); | |
640 | up_read(&crypto_alg_sem); | |
641 | ||
642 | if (!alg2) { | |
643 | if (alg) | |
644 | crypto_shoot_alg(alg); | |
645 | return ERR_PTR(-EAGAIN); | |
646 | } | |
647 | ||
97eedce1 HX |
648 | return alg; |
649 | } | |
650 | ||
651 | struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, | |
652 | u32 mask) | |
653 | { | |
654 | struct crypto_alg *alg; | |
655 | struct crypto_tfm *tfm; | |
656 | ||
657 | alg = crypto_spawn_alg(spawn); | |
658 | if (IS_ERR(alg)) | |
659 | return ERR_CAST(alg); | |
660 | ||
2e306ee0 HX |
661 | tfm = ERR_PTR(-EINVAL); |
662 | if (unlikely((alg->cra_flags ^ type) & mask)) | |
663 | goto out_put_alg; | |
664 | ||
27d2a330 | 665 | tfm = __crypto_alloc_tfm(alg, type, mask); |
6bfd4809 | 666 | if (IS_ERR(tfm)) |
2e306ee0 HX |
667 | goto out_put_alg; |
668 | ||
669 | return tfm; | |
6bfd4809 | 670 | |
2e306ee0 HX |
671 | out_put_alg: |
672 | crypto_mod_put(alg); | |
6bfd4809 HX |
673 | return tfm; |
674 | } | |
675 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm); | |
676 | ||
97eedce1 HX |
677 | void *crypto_spawn_tfm2(struct crypto_spawn *spawn) |
678 | { | |
679 | struct crypto_alg *alg; | |
680 | struct crypto_tfm *tfm; | |
681 | ||
682 | alg = crypto_spawn_alg(spawn); | |
683 | if (IS_ERR(alg)) | |
684 | return ERR_CAST(alg); | |
685 | ||
686 | tfm = crypto_create_tfm(alg, spawn->frontend); | |
687 | if (IS_ERR(tfm)) | |
688 | goto out_put_alg; | |
689 | ||
690 | return tfm; | |
691 | ||
692 | out_put_alg: | |
693 | crypto_mod_put(alg); | |
694 | return tfm; | |
695 | } | |
696 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm2); | |
697 | ||
2825982d HX |
698 | int crypto_register_notifier(struct notifier_block *nb) |
699 | { | |
700 | return blocking_notifier_chain_register(&crypto_chain, nb); | |
701 | } | |
702 | EXPORT_SYMBOL_GPL(crypto_register_notifier); | |
703 | ||
704 | int crypto_unregister_notifier(struct notifier_block *nb) | |
705 | { | |
706 | return blocking_notifier_chain_unregister(&crypto_chain, nb); | |
707 | } | |
708 | EXPORT_SYMBOL_GPL(crypto_unregister_notifier); | |
709 | ||
ebc610e5 | 710 | struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb) |
7fed0bf2 | 711 | { |
39e1ee01 | 712 | struct rtattr *rta = tb[0]; |
ebc610e5 HX |
713 | struct crypto_attr_type *algt; |
714 | ||
715 | if (!rta) | |
716 | return ERR_PTR(-ENOENT); | |
717 | if (RTA_PAYLOAD(rta) < sizeof(*algt)) | |
718 | return ERR_PTR(-EINVAL); | |
39e1ee01 HX |
719 | if (rta->rta_type != CRYPTOA_TYPE) |
720 | return ERR_PTR(-EINVAL); | |
ebc610e5 HX |
721 | |
722 | algt = RTA_DATA(rta); | |
723 | ||
724 | return algt; | |
725 | } | |
726 | EXPORT_SYMBOL_GPL(crypto_get_attr_type); | |
727 | ||
728 | int crypto_check_attr_type(struct rtattr **tb, u32 type) | |
729 | { | |
730 | struct crypto_attr_type *algt; | |
731 | ||
732 | algt = crypto_get_attr_type(tb); | |
733 | if (IS_ERR(algt)) | |
734 | return PTR_ERR(algt); | |
735 | ||
736 | if ((algt->type ^ type) & algt->mask) | |
737 | return -EINVAL; | |
738 | ||
739 | return 0; | |
740 | } | |
741 | EXPORT_SYMBOL_GPL(crypto_check_attr_type); | |
742 | ||
68b6c7d6 | 743 | const char *crypto_attr_alg_name(struct rtattr *rta) |
ebc610e5 | 744 | { |
7fed0bf2 HX |
745 | struct crypto_attr_alg *alga; |
746 | ||
ebc610e5 HX |
747 | if (!rta) |
748 | return ERR_PTR(-ENOENT); | |
749 | if (RTA_PAYLOAD(rta) < sizeof(*alga)) | |
7fed0bf2 | 750 | return ERR_PTR(-EINVAL); |
39e1ee01 HX |
751 | if (rta->rta_type != CRYPTOA_ALG) |
752 | return ERR_PTR(-EINVAL); | |
7fed0bf2 HX |
753 | |
754 | alga = RTA_DATA(rta); | |
755 | alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0; | |
756 | ||
68b6c7d6 HX |
757 | return alga->name; |
758 | } | |
759 | EXPORT_SYMBOL_GPL(crypto_attr_alg_name); | |
760 | ||
d06854f0 HX |
761 | struct crypto_alg *crypto_attr_alg2(struct rtattr *rta, |
762 | const struct crypto_type *frontend, | |
763 | u32 type, u32 mask) | |
68b6c7d6 HX |
764 | { |
765 | const char *name; | |
68b6c7d6 HX |
766 | |
767 | name = crypto_attr_alg_name(rta); | |
68b6c7d6 | 768 | if (IS_ERR(name)) |
3e8afe35 | 769 | return ERR_CAST(name); |
68b6c7d6 | 770 | |
d06854f0 | 771 | return crypto_find_alg(name, frontend, type, mask); |
7fed0bf2 | 772 | } |
d06854f0 | 773 | EXPORT_SYMBOL_GPL(crypto_attr_alg2); |
3c09f17c HX |
774 | |
775 | int crypto_attr_u32(struct rtattr *rta, u32 *num) | |
776 | { | |
777 | struct crypto_attr_u32 *nu32; | |
778 | ||
779 | if (!rta) | |
780 | return -ENOENT; | |
781 | if (RTA_PAYLOAD(rta) < sizeof(*nu32)) | |
782 | return -EINVAL; | |
783 | if (rta->rta_type != CRYPTOA_U32) | |
784 | return -EINVAL; | |
785 | ||
786 | nu32 = RTA_DATA(rta); | |
787 | *num = nu32->num; | |
788 | ||
789 | return 0; | |
790 | } | |
791 | EXPORT_SYMBOL_GPL(crypto_attr_u32); | |
7fed0bf2 | 792 | |
70ec7bb9 HX |
793 | void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg, |
794 | unsigned int head) | |
7fed0bf2 HX |
795 | { |
796 | struct crypto_instance *inst; | |
70ec7bb9 | 797 | char *p; |
7fed0bf2 HX |
798 | int err; |
799 | ||
70ec7bb9 HX |
800 | p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn), |
801 | GFP_KERNEL); | |
802 | if (!p) | |
7fed0bf2 HX |
803 | return ERR_PTR(-ENOMEM); |
804 | ||
70ec7bb9 HX |
805 | inst = (void *)(p + head); |
806 | ||
7fed0bf2 HX |
807 | err = -ENAMETOOLONG; |
808 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name, | |
809 | alg->cra_name) >= CRYPTO_MAX_ALG_NAME) | |
810 | goto err_free_inst; | |
811 | ||
812 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", | |
813 | name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) | |
814 | goto err_free_inst; | |
815 | ||
70ec7bb9 HX |
816 | return p; |
817 | ||
818 | err_free_inst: | |
819 | kfree(p); | |
820 | return ERR_PTR(err); | |
821 | } | |
822 | EXPORT_SYMBOL_GPL(crypto_alloc_instance2); | |
823 | ||
824 | struct crypto_instance *crypto_alloc_instance(const char *name, | |
825 | struct crypto_alg *alg) | |
826 | { | |
827 | struct crypto_instance *inst; | |
828 | struct crypto_spawn *spawn; | |
829 | int err; | |
830 | ||
831 | inst = crypto_alloc_instance2(name, alg, 0); | |
832 | if (IS_ERR(inst)) | |
833 | goto out; | |
834 | ||
7fed0bf2 | 835 | spawn = crypto_instance_ctx(inst); |
a73e6996 HX |
836 | err = crypto_init_spawn(spawn, alg, inst, |
837 | CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); | |
7fed0bf2 HX |
838 | |
839 | if (err) | |
840 | goto err_free_inst; | |
841 | ||
842 | return inst; | |
843 | ||
844 | err_free_inst: | |
845 | kfree(inst); | |
70ec7bb9 HX |
846 | inst = ERR_PTR(err); |
847 | ||
848 | out: | |
849 | return inst; | |
7fed0bf2 HX |
850 | } |
851 | EXPORT_SYMBOL_GPL(crypto_alloc_instance); | |
852 | ||
b5b7f088 HX |
853 | void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen) |
854 | { | |
855 | INIT_LIST_HEAD(&queue->list); | |
856 | queue->backlog = &queue->list; | |
857 | queue->qlen = 0; | |
858 | queue->max_qlen = max_qlen; | |
859 | } | |
860 | EXPORT_SYMBOL_GPL(crypto_init_queue); | |
861 | ||
862 | int crypto_enqueue_request(struct crypto_queue *queue, | |
863 | struct crypto_async_request *request) | |
864 | { | |
865 | int err = -EINPROGRESS; | |
866 | ||
867 | if (unlikely(queue->qlen >= queue->max_qlen)) { | |
868 | err = -EBUSY; | |
869 | if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) | |
870 | goto out; | |
871 | if (queue->backlog == &queue->list) | |
872 | queue->backlog = &request->list; | |
873 | } | |
874 | ||
875 | queue->qlen++; | |
876 | list_add_tail(&request->list, &queue->list); | |
877 | ||
878 | out: | |
879 | return err; | |
880 | } | |
881 | EXPORT_SYMBOL_GPL(crypto_enqueue_request); | |
882 | ||
0c7d400f | 883 | void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset) |
b5b7f088 HX |
884 | { |
885 | struct list_head *request; | |
886 | ||
887 | if (unlikely(!queue->qlen)) | |
888 | return NULL; | |
889 | ||
890 | queue->qlen--; | |
891 | ||
892 | if (queue->backlog != &queue->list) | |
893 | queue->backlog = queue->backlog->next; | |
894 | ||
895 | request = queue->list.next; | |
896 | list_del(request); | |
897 | ||
0c7d400f HX |
898 | return (char *)list_entry(request, struct crypto_async_request, list) - |
899 | offset; | |
900 | } | |
901 | EXPORT_SYMBOL_GPL(__crypto_dequeue_request); | |
902 | ||
903 | struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) | |
904 | { | |
905 | return __crypto_dequeue_request(queue, 0); | |
b5b7f088 HX |
906 | } |
907 | EXPORT_SYMBOL_GPL(crypto_dequeue_request); | |
908 | ||
909 | int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm) | |
910 | { | |
911 | struct crypto_async_request *req; | |
912 | ||
913 | list_for_each_entry(req, &queue->list, list) { | |
914 | if (req->tfm == tfm) | |
915 | return 1; | |
916 | } | |
917 | ||
918 | return 0; | |
919 | } | |
920 | EXPORT_SYMBOL_GPL(crypto_tfm_in_queue); | |
921 | ||
7613636d HX |
922 | static inline void crypto_inc_byte(u8 *a, unsigned int size) |
923 | { | |
924 | u8 *b = (a + size); | |
925 | u8 c; | |
926 | ||
927 | for (; size; size--) { | |
928 | c = *--b + 1; | |
929 | *b = c; | |
930 | if (c) | |
931 | break; | |
932 | } | |
933 | } | |
934 | ||
935 | void crypto_inc(u8 *a, unsigned int size) | |
936 | { | |
937 | __be32 *b = (__be32 *)(a + size); | |
938 | u32 c; | |
939 | ||
940 | for (; size >= 4; size -= 4) { | |
941 | c = be32_to_cpu(*--b) + 1; | |
942 | *b = cpu_to_be32(c); | |
943 | if (c) | |
944 | return; | |
945 | } | |
946 | ||
947 | crypto_inc_byte(a, size); | |
948 | } | |
949 | EXPORT_SYMBOL_GPL(crypto_inc); | |
950 | ||
951 | static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size) | |
952 | { | |
953 | for (; size; size--) | |
954 | *a++ ^= *b++; | |
955 | } | |
956 | ||
957 | void crypto_xor(u8 *dst, const u8 *src, unsigned int size) | |
958 | { | |
959 | u32 *a = (u32 *)dst; | |
960 | u32 *b = (u32 *)src; | |
961 | ||
962 | for (; size >= 4; size -= 4) | |
963 | *a++ ^= *b++; | |
964 | ||
965 | crypto_xor_byte((u8 *)a, (u8 *)b, size); | |
966 | } | |
967 | EXPORT_SYMBOL_GPL(crypto_xor); | |
968 | ||
cce9e06d HX |
969 | static int __init crypto_algapi_init(void) |
970 | { | |
971 | crypto_init_proc(); | |
972 | return 0; | |
973 | } | |
974 | ||
975 | static void __exit crypto_algapi_exit(void) | |
976 | { | |
977 | crypto_exit_proc(); | |
978 | } | |
979 | ||
980 | module_init(crypto_algapi_init); | |
981 | module_exit(crypto_algapi_exit); | |
982 | ||
983 | MODULE_LICENSE("GPL"); | |
984 | MODULE_DESCRIPTION("Cryptographic algorithms API"); |