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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 | ||
002c77a4 JW |
44 | static inline void crypto_check_module_sig(struct module *mod) |
45 | { | |
59afdc7b | 46 | if (fips_enabled && mod && !module_sig_ok(mod)) |
002c77a4 JW |
47 | panic("Module %s signature verification failed in FIPS mode\n", |
48 | mod->name); | |
002c77a4 JW |
49 | } |
50 | ||
4cc7720c | 51 | static int crypto_check_alg(struct crypto_alg *alg) |
cce9e06d | 52 | { |
002c77a4 JW |
53 | crypto_check_module_sig(alg->cra_module); |
54 | ||
cce9e06d HX |
55 | if (alg->cra_alignmask & (alg->cra_alignmask + 1)) |
56 | return -EINVAL; | |
57 | ||
cce9e06d HX |
58 | if (alg->cra_blocksize > PAGE_SIZE / 8) |
59 | return -EINVAL; | |
60 | ||
61 | if (alg->cra_priority < 0) | |
62 | return -EINVAL; | |
cce9e06d | 63 | |
e9b8e5be HX |
64 | atomic_set(&alg->cra_refcnt, 1); |
65 | ||
4cc7720c HX |
66 | return crypto_set_driver_name(alg); |
67 | } | |
68 | ||
6bfd4809 HX |
69 | static void crypto_destroy_instance(struct crypto_alg *alg) |
70 | { | |
71 | struct crypto_instance *inst = (void *)alg; | |
72 | struct crypto_template *tmpl = inst->tmpl; | |
73 | ||
74 | tmpl->free(inst); | |
75 | crypto_tmpl_put(tmpl); | |
76 | } | |
77 | ||
2bf29016 HX |
78 | static struct list_head *crypto_more_spawns(struct crypto_alg *alg, |
79 | struct list_head *stack, | |
80 | struct list_head *top, | |
81 | struct list_head *secondary_spawns) | |
82 | { | |
83 | struct crypto_spawn *spawn, *n; | |
84 | ||
85 | if (list_empty(stack)) | |
86 | return NULL; | |
87 | ||
88 | spawn = list_first_entry(stack, struct crypto_spawn, list); | |
89 | n = list_entry(spawn->list.next, struct crypto_spawn, list); | |
90 | ||
91 | if (spawn->alg && &n->list != stack && !n->alg) | |
92 | n->alg = (n->list.next == stack) ? alg : | |
93 | &list_entry(n->list.next, struct crypto_spawn, | |
94 | list)->inst->alg; | |
95 | ||
96 | list_move(&spawn->list, secondary_spawns); | |
97 | ||
98 | return &n->list == stack ? top : &n->inst->alg.cra_users; | |
99 | } | |
100 | ||
1f723710 HX |
101 | static void crypto_remove_instance(struct crypto_instance *inst, |
102 | struct list_head *list) | |
6bfd4809 | 103 | { |
a73e6996 | 104 | struct crypto_template *tmpl = inst->tmpl; |
6bfd4809 | 105 | |
a73e6996 HX |
106 | if (crypto_is_dead(&inst->alg)) |
107 | return; | |
6bfd4809 | 108 | |
a73e6996 | 109 | inst->alg.cra_flags |= CRYPTO_ALG_DEAD; |
38cb2419 HX |
110 | if (hlist_unhashed(&inst->list)) |
111 | return; | |
112 | ||
a73e6996 HX |
113 | if (!tmpl || !crypto_tmpl_get(tmpl)) |
114 | return; | |
115 | ||
116 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg); | |
117 | list_move(&inst->alg.cra_list, list); | |
118 | hlist_del(&inst->list); | |
119 | inst->alg.cra_destroy = crypto_destroy_instance; | |
120 | ||
2bf29016 | 121 | BUG_ON(!list_empty(&inst->alg.cra_users)); |
a73e6996 HX |
122 | } |
123 | ||
89b596ba SK |
124 | void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list, |
125 | struct crypto_alg *nalg) | |
a73e6996 | 126 | { |
2bf29016 | 127 | u32 new_type = (nalg ?: alg)->cra_flags; |
a73e6996 HX |
128 | struct crypto_spawn *spawn, *n; |
129 | LIST_HEAD(secondary_spawns); | |
2bf29016 HX |
130 | struct list_head *spawns; |
131 | LIST_HEAD(stack); | |
132 | LIST_HEAD(top); | |
6bfd4809 | 133 | |
2bf29016 | 134 | spawns = &alg->cra_users; |
a73e6996 HX |
135 | list_for_each_entry_safe(spawn, n, spawns, list) { |
136 | if ((spawn->alg->cra_flags ^ new_type) & spawn->mask) | |
6bfd4809 HX |
137 | continue; |
138 | ||
2bf29016 | 139 | list_move(&spawn->list, &top); |
a73e6996 | 140 | } |
6bfd4809 | 141 | |
2bf29016 HX |
142 | spawns = ⊤ |
143 | do { | |
144 | while (!list_empty(spawns)) { | |
145 | struct crypto_instance *inst; | |
146 | ||
147 | spawn = list_first_entry(spawns, struct crypto_spawn, | |
148 | list); | |
149 | inst = spawn->inst; | |
150 | ||
151 | BUG_ON(&inst->alg == alg); | |
152 | ||
153 | list_move(&spawn->list, &stack); | |
154 | ||
155 | if (&inst->alg == nalg) | |
156 | break; | |
157 | ||
158 | spawn->alg = NULL; | |
159 | spawns = &inst->alg.cra_users; | |
160 | } | |
161 | } while ((spawns = crypto_more_spawns(alg, &stack, &top, | |
162 | &secondary_spawns))); | |
163 | ||
164 | list_for_each_entry_safe(spawn, n, &secondary_spawns, list) { | |
165 | if (spawn->alg) | |
166 | list_move(&spawn->list, &spawn->alg->cra_users); | |
167 | else | |
1f723710 | 168 | crypto_remove_instance(spawn->inst, list); |
6bfd4809 HX |
169 | } |
170 | } | |
89b596ba | 171 | EXPORT_SYMBOL_GPL(crypto_remove_spawns); |
6bfd4809 | 172 | |
73d3864a | 173 | static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg) |
4cc7720c HX |
174 | { |
175 | struct crypto_alg *q; | |
73d3864a | 176 | struct crypto_larval *larval; |
6bfd4809 HX |
177 | int ret = -EAGAIN; |
178 | ||
179 | if (crypto_is_dead(alg)) | |
73d3864a | 180 | goto err; |
6bfd4809 HX |
181 | |
182 | INIT_LIST_HEAD(&alg->cra_users); | |
183 | ||
73d3864a HX |
184 | /* No cheating! */ |
185 | alg->cra_flags &= ~CRYPTO_ALG_TESTED; | |
186 | ||
6bfd4809 | 187 | ret = -EEXIST; |
4cc7720c | 188 | |
cce9e06d | 189 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
4cc7720c | 190 | if (q == alg) |
73d3864a HX |
191 | goto err; |
192 | ||
b8e15992 HX |
193 | if (crypto_is_moribund(q)) |
194 | continue; | |
195 | ||
73d3864a HX |
196 | if (crypto_is_larval(q)) { |
197 | if (!strcmp(alg->cra_driver_name, q->cra_driver_name)) | |
198 | goto err; | |
199 | continue; | |
200 | } | |
201 | ||
202 | if (!strcmp(q->cra_driver_name, alg->cra_name) || | |
203 | !strcmp(q->cra_name, alg->cra_driver_name)) | |
204 | goto err; | |
205 | } | |
206 | ||
207 | larval = crypto_larval_alloc(alg->cra_name, | |
208 | alg->cra_flags | CRYPTO_ALG_TESTED, 0); | |
209 | if (IS_ERR(larval)) | |
210 | goto out; | |
211 | ||
212 | ret = -ENOENT; | |
213 | larval->adult = crypto_mod_get(alg); | |
214 | if (!larval->adult) | |
215 | goto free_larval; | |
216 | ||
217 | atomic_set(&larval->alg.cra_refcnt, 1); | |
218 | memcpy(larval->alg.cra_driver_name, alg->cra_driver_name, | |
219 | CRYPTO_MAX_ALG_NAME); | |
220 | larval->alg.cra_priority = alg->cra_priority; | |
221 | ||
222 | list_add(&alg->cra_list, &crypto_alg_list); | |
223 | list_add(&larval->alg.cra_list, &crypto_alg_list); | |
224 | ||
5357c6c4 | 225 | out: |
73d3864a HX |
226 | return larval; |
227 | ||
228 | free_larval: | |
229 | kfree(larval); | |
230 | err: | |
231 | larval = ERR_PTR(ret); | |
232 | goto out; | |
233 | } | |
234 | ||
235 | void crypto_alg_tested(const char *name, int err) | |
236 | { | |
237 | struct crypto_larval *test; | |
238 | struct crypto_alg *alg; | |
239 | struct crypto_alg *q; | |
240 | LIST_HEAD(list); | |
241 | ||
242 | down_write(&crypto_alg_sem); | |
243 | list_for_each_entry(q, &crypto_alg_list, cra_list) { | |
b8e15992 | 244 | if (crypto_is_moribund(q) || !crypto_is_larval(q)) |
73d3864a HX |
245 | continue; |
246 | ||
247 | test = (struct crypto_larval *)q; | |
248 | ||
249 | if (!strcmp(q->cra_driver_name, name)) | |
250 | goto found; | |
251 | } | |
252 | ||
253 | printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err); | |
254 | goto unlock; | |
255 | ||
256 | found: | |
b8e15992 | 257 | q->cra_flags |= CRYPTO_ALG_DEAD; |
73d3864a HX |
258 | alg = test->adult; |
259 | if (err || list_empty(&alg->cra_list)) | |
260 | goto complete; | |
261 | ||
262 | alg->cra_flags |= CRYPTO_ALG_TESTED; | |
263 | ||
264 | list_for_each_entry(q, &crypto_alg_list, cra_list) { | |
265 | if (q == alg) | |
266 | continue; | |
6bfd4809 HX |
267 | |
268 | if (crypto_is_moribund(q)) | |
269 | continue; | |
270 | ||
271 | if (crypto_is_larval(q)) { | |
2825982d HX |
272 | struct crypto_larval *larval = (void *)q; |
273 | ||
d8058480 HX |
274 | /* |
275 | * Check to see if either our generic name or | |
276 | * specific name can satisfy the name requested | |
277 | * by the larval entry q. | |
278 | */ | |
6bfd4809 HX |
279 | if (strcmp(alg->cra_name, q->cra_name) && |
280 | strcmp(alg->cra_driver_name, q->cra_name)) | |
281 | continue; | |
282 | ||
283 | if (larval->adult) | |
284 | continue; | |
492e2b63 HX |
285 | if ((q->cra_flags ^ alg->cra_flags) & larval->mask) |
286 | continue; | |
2825982d HX |
287 | if (!crypto_mod_get(alg)) |
288 | continue; | |
6bfd4809 | 289 | |
2825982d | 290 | larval->adult = alg; |
6bfd4809 | 291 | continue; |
2825982d | 292 | } |
6bfd4809 HX |
293 | |
294 | if (strcmp(alg->cra_name, q->cra_name)) | |
295 | continue; | |
296 | ||
297 | if (strcmp(alg->cra_driver_name, q->cra_driver_name) && | |
298 | q->cra_priority > alg->cra_priority) | |
299 | continue; | |
300 | ||
2bf29016 | 301 | crypto_remove_spawns(q, &list, alg); |
cce9e06d | 302 | } |
2825982d | 303 | |
73d3864a HX |
304 | complete: |
305 | complete_all(&test->completion); | |
2825982d | 306 | |
73d3864a HX |
307 | unlock: |
308 | up_write(&crypto_alg_sem); | |
309 | ||
310 | crypto_remove_final(&list); | |
cce9e06d | 311 | } |
73d3864a | 312 | EXPORT_SYMBOL_GPL(crypto_alg_tested); |
4cc7720c | 313 | |
22e5b20b | 314 | void crypto_remove_final(struct list_head *list) |
6bfd4809 HX |
315 | { |
316 | struct crypto_alg *alg; | |
317 | struct crypto_alg *n; | |
318 | ||
319 | list_for_each_entry_safe(alg, n, list, cra_list) { | |
320 | list_del_init(&alg->cra_list); | |
321 | crypto_alg_put(alg); | |
322 | } | |
323 | } | |
22e5b20b | 324 | EXPORT_SYMBOL_GPL(crypto_remove_final); |
6bfd4809 | 325 | |
73d3864a HX |
326 | static void crypto_wait_for_test(struct crypto_larval *larval) |
327 | { | |
328 | int err; | |
329 | ||
330 | err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult); | |
331 | if (err != NOTIFY_STOP) { | |
332 | if (WARN_ON(err != NOTIFY_DONE)) | |
333 | goto out; | |
334 | crypto_alg_tested(larval->alg.cra_driver_name, 0); | |
335 | } | |
336 | ||
337 | err = wait_for_completion_interruptible(&larval->completion); | |
338 | WARN_ON(err); | |
339 | ||
340 | out: | |
341 | crypto_larval_kill(&larval->alg); | |
342 | } | |
343 | ||
4cc7720c HX |
344 | int crypto_register_alg(struct crypto_alg *alg) |
345 | { | |
73d3864a | 346 | struct crypto_larval *larval; |
4cc7720c HX |
347 | int err; |
348 | ||
349 | err = crypto_check_alg(alg); | |
350 | if (err) | |
351 | return err; | |
352 | ||
353 | down_write(&crypto_alg_sem); | |
73d3864a | 354 | larval = __crypto_register_alg(alg); |
4cc7720c HX |
355 | up_write(&crypto_alg_sem); |
356 | ||
73d3864a HX |
357 | if (IS_ERR(larval)) |
358 | return PTR_ERR(larval); | |
359 | ||
360 | crypto_wait_for_test(larval); | |
361 | return 0; | |
4cc7720c | 362 | } |
cce9e06d HX |
363 | EXPORT_SYMBOL_GPL(crypto_register_alg); |
364 | ||
6bfd4809 HX |
365 | static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list) |
366 | { | |
367 | if (unlikely(list_empty(&alg->cra_list))) | |
368 | return -ENOENT; | |
369 | ||
370 | alg->cra_flags |= CRYPTO_ALG_DEAD; | |
371 | ||
372 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg); | |
373 | list_del_init(&alg->cra_list); | |
2bf29016 | 374 | crypto_remove_spawns(alg, list, NULL); |
6bfd4809 HX |
375 | |
376 | return 0; | |
377 | } | |
378 | ||
cce9e06d HX |
379 | int crypto_unregister_alg(struct crypto_alg *alg) |
380 | { | |
6bfd4809 HX |
381 | int ret; |
382 | LIST_HEAD(list); | |
5357c6c4 | 383 | |
cce9e06d | 384 | down_write(&crypto_alg_sem); |
6bfd4809 | 385 | ret = crypto_remove_alg(alg, &list); |
cce9e06d HX |
386 | up_write(&crypto_alg_sem); |
387 | ||
388 | if (ret) | |
389 | return ret; | |
390 | ||
391 | BUG_ON(atomic_read(&alg->cra_refcnt) != 1); | |
392 | if (alg->cra_destroy) | |
393 | alg->cra_destroy(alg); | |
394 | ||
6bfd4809 | 395 | crypto_remove_final(&list); |
cce9e06d HX |
396 | return 0; |
397 | } | |
398 | EXPORT_SYMBOL_GPL(crypto_unregister_alg); | |
399 | ||
4b004346 MB |
400 | int crypto_register_algs(struct crypto_alg *algs, int count) |
401 | { | |
402 | int i, ret; | |
403 | ||
404 | for (i = 0; i < count; i++) { | |
405 | ret = crypto_register_alg(&algs[i]); | |
406 | if (ret) | |
407 | goto err; | |
408 | } | |
409 | ||
410 | return 0; | |
411 | ||
412 | err: | |
413 | for (--i; i >= 0; --i) | |
414 | crypto_unregister_alg(&algs[i]); | |
415 | ||
416 | return ret; | |
417 | } | |
418 | EXPORT_SYMBOL_GPL(crypto_register_algs); | |
419 | ||
420 | int crypto_unregister_algs(struct crypto_alg *algs, int count) | |
421 | { | |
422 | int i, ret; | |
423 | ||
424 | for (i = 0; i < count; i++) { | |
425 | ret = crypto_unregister_alg(&algs[i]); | |
426 | if (ret) | |
427 | pr_err("Failed to unregister %s %s: %d\n", | |
428 | algs[i].cra_driver_name, algs[i].cra_name, ret); | |
429 | } | |
430 | ||
431 | return 0; | |
432 | } | |
433 | EXPORT_SYMBOL_GPL(crypto_unregister_algs); | |
434 | ||
4cc7720c HX |
435 | int crypto_register_template(struct crypto_template *tmpl) |
436 | { | |
437 | struct crypto_template *q; | |
438 | int err = -EEXIST; | |
439 | ||
440 | down_write(&crypto_alg_sem); | |
441 | ||
002c77a4 JW |
442 | crypto_check_module_sig(tmpl->module); |
443 | ||
4cc7720c HX |
444 | list_for_each_entry(q, &crypto_template_list, list) { |
445 | if (q == tmpl) | |
446 | goto out; | |
447 | } | |
448 | ||
449 | list_add(&tmpl->list, &crypto_template_list); | |
2825982d | 450 | crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl); |
4cc7720c HX |
451 | err = 0; |
452 | out: | |
453 | up_write(&crypto_alg_sem); | |
454 | return err; | |
455 | } | |
456 | EXPORT_SYMBOL_GPL(crypto_register_template); | |
457 | ||
458 | void crypto_unregister_template(struct crypto_template *tmpl) | |
459 | { | |
460 | struct crypto_instance *inst; | |
b67bfe0d | 461 | struct hlist_node *n; |
4cc7720c | 462 | struct hlist_head *list; |
6bfd4809 | 463 | LIST_HEAD(users); |
4cc7720c HX |
464 | |
465 | down_write(&crypto_alg_sem); | |
466 | ||
467 | BUG_ON(list_empty(&tmpl->list)); | |
468 | list_del_init(&tmpl->list); | |
469 | ||
470 | list = &tmpl->instances; | |
b67bfe0d | 471 | hlist_for_each_entry(inst, list, list) { |
6bfd4809 | 472 | int err = crypto_remove_alg(&inst->alg, &users); |
0efcb8d5 | 473 | |
6bfd4809 | 474 | BUG_ON(err); |
4cc7720c HX |
475 | } |
476 | ||
2825982d HX |
477 | crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl); |
478 | ||
4cc7720c HX |
479 | up_write(&crypto_alg_sem); |
480 | ||
b67bfe0d | 481 | hlist_for_each_entry_safe(inst, n, list, list) { |
4cc7720c HX |
482 | BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1); |
483 | tmpl->free(inst); | |
484 | } | |
6bfd4809 | 485 | crypto_remove_final(&users); |
4cc7720c HX |
486 | } |
487 | EXPORT_SYMBOL_GPL(crypto_unregister_template); | |
488 | ||
489 | static struct crypto_template *__crypto_lookup_template(const char *name) | |
490 | { | |
491 | struct crypto_template *q, *tmpl = NULL; | |
492 | ||
493 | down_read(&crypto_alg_sem); | |
494 | list_for_each_entry(q, &crypto_template_list, list) { | |
495 | if (strcmp(q->name, name)) | |
496 | continue; | |
497 | if (unlikely(!crypto_tmpl_get(q))) | |
498 | continue; | |
499 | ||
500 | tmpl = q; | |
501 | break; | |
502 | } | |
503 | up_read(&crypto_alg_sem); | |
504 | ||
505 | return tmpl; | |
506 | } | |
507 | ||
508 | struct crypto_template *crypto_lookup_template(const char *name) | |
509 | { | |
4943ba16 KC |
510 | return try_then_request_module(__crypto_lookup_template(name), |
511 | "crypto-%s", name); | |
4cc7720c HX |
512 | } |
513 | EXPORT_SYMBOL_GPL(crypto_lookup_template); | |
514 | ||
515 | int crypto_register_instance(struct crypto_template *tmpl, | |
516 | struct crypto_instance *inst) | |
517 | { | |
73d3864a HX |
518 | struct crypto_larval *larval; |
519 | int err; | |
4cc7720c | 520 | |
4cc7720c HX |
521 | err = crypto_check_alg(&inst->alg); |
522 | if (err) | |
9c521a20 SM |
523 | return err; |
524 | ||
4cc7720c | 525 | inst->alg.cra_module = tmpl->module; |
64a947b1 | 526 | inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE; |
4cc7720c | 527 | |
34c9a0ff HX |
528 | if (unlikely(!crypto_mod_get(&inst->alg))) |
529 | return -EAGAIN; | |
530 | ||
4cc7720c HX |
531 | down_write(&crypto_alg_sem); |
532 | ||
73d3864a HX |
533 | larval = __crypto_register_alg(&inst->alg); |
534 | if (IS_ERR(larval)) | |
4cc7720c HX |
535 | goto unlock; |
536 | ||
537 | hlist_add_head(&inst->list, &tmpl->instances); | |
538 | inst->tmpl = tmpl; | |
539 | ||
540 | unlock: | |
541 | up_write(&crypto_alg_sem); | |
542 | ||
73d3864a HX |
543 | err = PTR_ERR(larval); |
544 | if (IS_ERR(larval)) | |
545 | goto err; | |
546 | ||
547 | crypto_wait_for_test(larval); | |
9c521a20 SM |
548 | |
549 | /* Remove instance if test failed */ | |
550 | if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED)) | |
551 | crypto_unregister_instance(inst); | |
73d3864a | 552 | err = 0; |
6bfd4809 | 553 | |
4cc7720c | 554 | err: |
9c521a20 | 555 | crypto_mod_put(&inst->alg); |
4cc7720c HX |
556 | return err; |
557 | } | |
558 | EXPORT_SYMBOL_GPL(crypto_register_instance); | |
ce3fd840 | 559 | |
87b16756 | 560 | int crypto_unregister_instance(struct crypto_instance *inst) |
ce3fd840 | 561 | { |
1f723710 | 562 | LIST_HEAD(list); |
ce3fd840 | 563 | |
ce3fd840 SK |
564 | down_write(&crypto_alg_sem); |
565 | ||
87b16756 | 566 | crypto_remove_spawns(&inst->alg, &list, NULL); |
1f723710 | 567 | crypto_remove_instance(inst, &list); |
ce3fd840 SK |
568 | |
569 | up_write(&crypto_alg_sem); | |
570 | ||
1f723710 | 571 | crypto_remove_final(&list); |
ce3fd840 SK |
572 | |
573 | return 0; | |
574 | } | |
575 | EXPORT_SYMBOL_GPL(crypto_unregister_instance); | |
4cc7720c | 576 | |
6bfd4809 | 577 | int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, |
a73e6996 | 578 | struct crypto_instance *inst, u32 mask) |
6bfd4809 HX |
579 | { |
580 | int err = -EAGAIN; | |
581 | ||
582 | spawn->inst = inst; | |
a73e6996 | 583 | spawn->mask = mask; |
6bfd4809 HX |
584 | |
585 | down_write(&crypto_alg_sem); | |
586 | if (!crypto_is_moribund(alg)) { | |
587 | list_add(&spawn->list, &alg->cra_users); | |
588 | spawn->alg = alg; | |
589 | err = 0; | |
590 | } | |
591 | up_write(&crypto_alg_sem); | |
592 | ||
593 | return err; | |
594 | } | |
595 | EXPORT_SYMBOL_GPL(crypto_init_spawn); | |
596 | ||
97eedce1 HX |
597 | int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg, |
598 | struct crypto_instance *inst, | |
599 | const struct crypto_type *frontend) | |
600 | { | |
601 | int err = -EINVAL; | |
602 | ||
c614e109 | 603 | if ((alg->cra_flags ^ frontend->type) & frontend->maskset) |
97eedce1 HX |
604 | goto out; |
605 | ||
606 | spawn->frontend = frontend; | |
607 | err = crypto_init_spawn(spawn, alg, inst, frontend->maskset); | |
608 | ||
609 | out: | |
610 | return err; | |
611 | } | |
612 | EXPORT_SYMBOL_GPL(crypto_init_spawn2); | |
613 | ||
6bfd4809 HX |
614 | void crypto_drop_spawn(struct crypto_spawn *spawn) |
615 | { | |
7ede5a5b HX |
616 | if (!spawn->alg) |
617 | return; | |
618 | ||
6bfd4809 HX |
619 | down_write(&crypto_alg_sem); |
620 | list_del(&spawn->list); | |
621 | up_write(&crypto_alg_sem); | |
622 | } | |
623 | EXPORT_SYMBOL_GPL(crypto_drop_spawn); | |
624 | ||
97eedce1 | 625 | static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn) |
6bfd4809 HX |
626 | { |
627 | struct crypto_alg *alg; | |
628 | struct crypto_alg *alg2; | |
6bfd4809 HX |
629 | |
630 | down_read(&crypto_alg_sem); | |
631 | alg = spawn->alg; | |
632 | alg2 = alg; | |
633 | if (alg2) | |
634 | alg2 = crypto_mod_get(alg2); | |
635 | up_read(&crypto_alg_sem); | |
636 | ||
637 | if (!alg2) { | |
638 | if (alg) | |
639 | crypto_shoot_alg(alg); | |
640 | return ERR_PTR(-EAGAIN); | |
641 | } | |
642 | ||
97eedce1 HX |
643 | return alg; |
644 | } | |
645 | ||
646 | struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, | |
647 | u32 mask) | |
648 | { | |
649 | struct crypto_alg *alg; | |
650 | struct crypto_tfm *tfm; | |
651 | ||
652 | alg = crypto_spawn_alg(spawn); | |
653 | if (IS_ERR(alg)) | |
654 | return ERR_CAST(alg); | |
655 | ||
2e306ee0 HX |
656 | tfm = ERR_PTR(-EINVAL); |
657 | if (unlikely((alg->cra_flags ^ type) & mask)) | |
658 | goto out_put_alg; | |
659 | ||
27d2a330 | 660 | tfm = __crypto_alloc_tfm(alg, type, mask); |
6bfd4809 | 661 | if (IS_ERR(tfm)) |
2e306ee0 HX |
662 | goto out_put_alg; |
663 | ||
664 | return tfm; | |
6bfd4809 | 665 | |
2e306ee0 HX |
666 | out_put_alg: |
667 | crypto_mod_put(alg); | |
6bfd4809 HX |
668 | return tfm; |
669 | } | |
670 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm); | |
671 | ||
97eedce1 HX |
672 | void *crypto_spawn_tfm2(struct crypto_spawn *spawn) |
673 | { | |
674 | struct crypto_alg *alg; | |
675 | struct crypto_tfm *tfm; | |
676 | ||
677 | alg = crypto_spawn_alg(spawn); | |
678 | if (IS_ERR(alg)) | |
679 | return ERR_CAST(alg); | |
680 | ||
681 | tfm = crypto_create_tfm(alg, spawn->frontend); | |
682 | if (IS_ERR(tfm)) | |
683 | goto out_put_alg; | |
684 | ||
685 | return tfm; | |
686 | ||
687 | out_put_alg: | |
688 | crypto_mod_put(alg); | |
689 | return tfm; | |
690 | } | |
691 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm2); | |
692 | ||
2825982d HX |
693 | int crypto_register_notifier(struct notifier_block *nb) |
694 | { | |
695 | return blocking_notifier_chain_register(&crypto_chain, nb); | |
696 | } | |
697 | EXPORT_SYMBOL_GPL(crypto_register_notifier); | |
698 | ||
699 | int crypto_unregister_notifier(struct notifier_block *nb) | |
700 | { | |
701 | return blocking_notifier_chain_unregister(&crypto_chain, nb); | |
702 | } | |
703 | EXPORT_SYMBOL_GPL(crypto_unregister_notifier); | |
704 | ||
ebc610e5 | 705 | struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb) |
7fed0bf2 | 706 | { |
39e1ee01 | 707 | struct rtattr *rta = tb[0]; |
ebc610e5 HX |
708 | struct crypto_attr_type *algt; |
709 | ||
710 | if (!rta) | |
711 | return ERR_PTR(-ENOENT); | |
712 | if (RTA_PAYLOAD(rta) < sizeof(*algt)) | |
713 | return ERR_PTR(-EINVAL); | |
39e1ee01 HX |
714 | if (rta->rta_type != CRYPTOA_TYPE) |
715 | return ERR_PTR(-EINVAL); | |
ebc610e5 HX |
716 | |
717 | algt = RTA_DATA(rta); | |
718 | ||
719 | return algt; | |
720 | } | |
721 | EXPORT_SYMBOL_GPL(crypto_get_attr_type); | |
722 | ||
723 | int crypto_check_attr_type(struct rtattr **tb, u32 type) | |
724 | { | |
725 | struct crypto_attr_type *algt; | |
726 | ||
727 | algt = crypto_get_attr_type(tb); | |
728 | if (IS_ERR(algt)) | |
729 | return PTR_ERR(algt); | |
730 | ||
731 | if ((algt->type ^ type) & algt->mask) | |
732 | return -EINVAL; | |
733 | ||
734 | return 0; | |
735 | } | |
736 | EXPORT_SYMBOL_GPL(crypto_check_attr_type); | |
737 | ||
68b6c7d6 | 738 | const char *crypto_attr_alg_name(struct rtattr *rta) |
ebc610e5 | 739 | { |
7fed0bf2 HX |
740 | struct crypto_attr_alg *alga; |
741 | ||
ebc610e5 HX |
742 | if (!rta) |
743 | return ERR_PTR(-ENOENT); | |
744 | if (RTA_PAYLOAD(rta) < sizeof(*alga)) | |
7fed0bf2 | 745 | return ERR_PTR(-EINVAL); |
39e1ee01 HX |
746 | if (rta->rta_type != CRYPTOA_ALG) |
747 | return ERR_PTR(-EINVAL); | |
7fed0bf2 HX |
748 | |
749 | alga = RTA_DATA(rta); | |
750 | alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0; | |
751 | ||
68b6c7d6 HX |
752 | return alga->name; |
753 | } | |
754 | EXPORT_SYMBOL_GPL(crypto_attr_alg_name); | |
755 | ||
d06854f0 HX |
756 | struct crypto_alg *crypto_attr_alg2(struct rtattr *rta, |
757 | const struct crypto_type *frontend, | |
758 | u32 type, u32 mask) | |
68b6c7d6 HX |
759 | { |
760 | const char *name; | |
68b6c7d6 HX |
761 | |
762 | name = crypto_attr_alg_name(rta); | |
68b6c7d6 | 763 | if (IS_ERR(name)) |
3e8afe35 | 764 | return ERR_CAST(name); |
68b6c7d6 | 765 | |
d06854f0 | 766 | return crypto_find_alg(name, frontend, type, mask); |
7fed0bf2 | 767 | } |
d06854f0 | 768 | EXPORT_SYMBOL_GPL(crypto_attr_alg2); |
3c09f17c HX |
769 | |
770 | int crypto_attr_u32(struct rtattr *rta, u32 *num) | |
771 | { | |
772 | struct crypto_attr_u32 *nu32; | |
773 | ||
774 | if (!rta) | |
775 | return -ENOENT; | |
776 | if (RTA_PAYLOAD(rta) < sizeof(*nu32)) | |
777 | return -EINVAL; | |
778 | if (rta->rta_type != CRYPTOA_U32) | |
779 | return -EINVAL; | |
780 | ||
781 | nu32 = RTA_DATA(rta); | |
782 | *num = nu32->num; | |
783 | ||
784 | return 0; | |
785 | } | |
786 | EXPORT_SYMBOL_GPL(crypto_attr_u32); | |
7fed0bf2 | 787 | |
70ec7bb9 HX |
788 | void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg, |
789 | unsigned int head) | |
7fed0bf2 HX |
790 | { |
791 | struct crypto_instance *inst; | |
70ec7bb9 | 792 | char *p; |
7fed0bf2 HX |
793 | int err; |
794 | ||
70ec7bb9 HX |
795 | p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn), |
796 | GFP_KERNEL); | |
797 | if (!p) | |
7fed0bf2 HX |
798 | return ERR_PTR(-ENOMEM); |
799 | ||
70ec7bb9 HX |
800 | inst = (void *)(p + head); |
801 | ||
7fed0bf2 HX |
802 | err = -ENAMETOOLONG; |
803 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name, | |
804 | alg->cra_name) >= CRYPTO_MAX_ALG_NAME) | |
805 | goto err_free_inst; | |
806 | ||
807 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", | |
808 | name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) | |
809 | goto err_free_inst; | |
810 | ||
70ec7bb9 HX |
811 | return p; |
812 | ||
813 | err_free_inst: | |
814 | kfree(p); | |
815 | return ERR_PTR(err); | |
816 | } | |
817 | EXPORT_SYMBOL_GPL(crypto_alloc_instance2); | |
818 | ||
819 | struct crypto_instance *crypto_alloc_instance(const char *name, | |
820 | struct crypto_alg *alg) | |
821 | { | |
822 | struct crypto_instance *inst; | |
823 | struct crypto_spawn *spawn; | |
824 | int err; | |
825 | ||
826 | inst = crypto_alloc_instance2(name, alg, 0); | |
827 | if (IS_ERR(inst)) | |
828 | goto out; | |
829 | ||
7fed0bf2 | 830 | spawn = crypto_instance_ctx(inst); |
a73e6996 HX |
831 | err = crypto_init_spawn(spawn, alg, inst, |
832 | CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); | |
7fed0bf2 HX |
833 | |
834 | if (err) | |
835 | goto err_free_inst; | |
836 | ||
837 | return inst; | |
838 | ||
839 | err_free_inst: | |
840 | kfree(inst); | |
70ec7bb9 HX |
841 | inst = ERR_PTR(err); |
842 | ||
843 | out: | |
844 | return inst; | |
7fed0bf2 HX |
845 | } |
846 | EXPORT_SYMBOL_GPL(crypto_alloc_instance); | |
847 | ||
b5b7f088 HX |
848 | void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen) |
849 | { | |
850 | INIT_LIST_HEAD(&queue->list); | |
851 | queue->backlog = &queue->list; | |
852 | queue->qlen = 0; | |
853 | queue->max_qlen = max_qlen; | |
854 | } | |
855 | EXPORT_SYMBOL_GPL(crypto_init_queue); | |
856 | ||
857 | int crypto_enqueue_request(struct crypto_queue *queue, | |
858 | struct crypto_async_request *request) | |
859 | { | |
860 | int err = -EINPROGRESS; | |
861 | ||
862 | if (unlikely(queue->qlen >= queue->max_qlen)) { | |
863 | err = -EBUSY; | |
864 | if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) | |
865 | goto out; | |
866 | if (queue->backlog == &queue->list) | |
867 | queue->backlog = &request->list; | |
868 | } | |
869 | ||
870 | queue->qlen++; | |
871 | list_add_tail(&request->list, &queue->list); | |
872 | ||
873 | out: | |
874 | return err; | |
875 | } | |
876 | EXPORT_SYMBOL_GPL(crypto_enqueue_request); | |
877 | ||
0c7d400f | 878 | void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset) |
b5b7f088 HX |
879 | { |
880 | struct list_head *request; | |
881 | ||
882 | if (unlikely(!queue->qlen)) | |
883 | return NULL; | |
884 | ||
885 | queue->qlen--; | |
886 | ||
887 | if (queue->backlog != &queue->list) | |
888 | queue->backlog = queue->backlog->next; | |
889 | ||
890 | request = queue->list.next; | |
891 | list_del(request); | |
892 | ||
0c7d400f HX |
893 | return (char *)list_entry(request, struct crypto_async_request, list) - |
894 | offset; | |
895 | } | |
896 | EXPORT_SYMBOL_GPL(__crypto_dequeue_request); | |
897 | ||
898 | struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) | |
899 | { | |
900 | return __crypto_dequeue_request(queue, 0); | |
b5b7f088 HX |
901 | } |
902 | EXPORT_SYMBOL_GPL(crypto_dequeue_request); | |
903 | ||
904 | int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm) | |
905 | { | |
906 | struct crypto_async_request *req; | |
907 | ||
908 | list_for_each_entry(req, &queue->list, list) { | |
909 | if (req->tfm == tfm) | |
910 | return 1; | |
911 | } | |
912 | ||
913 | return 0; | |
914 | } | |
915 | EXPORT_SYMBOL_GPL(crypto_tfm_in_queue); | |
916 | ||
7613636d HX |
917 | static inline void crypto_inc_byte(u8 *a, unsigned int size) |
918 | { | |
919 | u8 *b = (a + size); | |
920 | u8 c; | |
921 | ||
922 | for (; size; size--) { | |
923 | c = *--b + 1; | |
924 | *b = c; | |
925 | if (c) | |
926 | break; | |
927 | } | |
928 | } | |
929 | ||
930 | void crypto_inc(u8 *a, unsigned int size) | |
931 | { | |
932 | __be32 *b = (__be32 *)(a + size); | |
933 | u32 c; | |
934 | ||
935 | for (; size >= 4; size -= 4) { | |
936 | c = be32_to_cpu(*--b) + 1; | |
937 | *b = cpu_to_be32(c); | |
938 | if (c) | |
939 | return; | |
940 | } | |
941 | ||
942 | crypto_inc_byte(a, size); | |
943 | } | |
944 | EXPORT_SYMBOL_GPL(crypto_inc); | |
945 | ||
946 | static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size) | |
947 | { | |
948 | for (; size; size--) | |
949 | *a++ ^= *b++; | |
950 | } | |
951 | ||
952 | void crypto_xor(u8 *dst, const u8 *src, unsigned int size) | |
953 | { | |
954 | u32 *a = (u32 *)dst; | |
955 | u32 *b = (u32 *)src; | |
956 | ||
957 | for (; size >= 4; size -= 4) | |
958 | *a++ ^= *b++; | |
959 | ||
960 | crypto_xor_byte((u8 *)a, (u8 *)b, size); | |
961 | } | |
962 | EXPORT_SYMBOL_GPL(crypto_xor); | |
963 | ||
38d21433 HX |
964 | unsigned int crypto_alg_extsize(struct crypto_alg *alg) |
965 | { | |
966 | return alg->cra_ctxsize; | |
967 | } | |
968 | EXPORT_SYMBOL_GPL(crypto_alg_extsize); | |
969 | ||
cce9e06d HX |
970 | static int __init crypto_algapi_init(void) |
971 | { | |
972 | crypto_init_proc(); | |
973 | return 0; | |
974 | } | |
975 | ||
976 | static void __exit crypto_algapi_exit(void) | |
977 | { | |
978 | crypto_exit_proc(); | |
979 | } | |
980 | ||
981 | module_init(crypto_algapi_init); | |
982 | module_exit(crypto_algapi_exit); | |
983 | ||
984 | MODULE_LICENSE("GPL"); | |
985 | MODULE_DESCRIPTION("Cryptographic algorithms API"); |