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> |
cce9e06d HX |
20 | #include <linux/string.h> |
21 | ||
22 | #include "internal.h" | |
23 | ||
4cc7720c HX |
24 | static LIST_HEAD(crypto_template_list); |
25 | ||
492e2b63 | 26 | void crypto_larval_error(const char *name, u32 type, u32 mask) |
2825982d HX |
27 | { |
28 | struct crypto_alg *alg; | |
29 | ||
30 | down_read(&crypto_alg_sem); | |
492e2b63 | 31 | alg = __crypto_alg_lookup(name, type, mask); |
2825982d HX |
32 | up_read(&crypto_alg_sem); |
33 | ||
34 | if (alg) { | |
35 | if (crypto_is_larval(alg)) { | |
36 | struct crypto_larval *larval = (void *)alg; | |
fe3c5206 | 37 | complete_all(&larval->completion); |
2825982d HX |
38 | } |
39 | crypto_mod_put(alg); | |
40 | } | |
41 | } | |
42 | EXPORT_SYMBOL_GPL(crypto_larval_error); | |
43 | ||
cce9e06d HX |
44 | static inline int crypto_set_driver_name(struct crypto_alg *alg) |
45 | { | |
46 | static const char suffix[] = "-generic"; | |
47 | char *driver_name = alg->cra_driver_name; | |
48 | int len; | |
49 | ||
50 | if (*driver_name) | |
51 | return 0; | |
52 | ||
53 | len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); | |
54 | if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME) | |
55 | return -ENAMETOOLONG; | |
56 | ||
57 | memcpy(driver_name + len, suffix, sizeof(suffix)); | |
58 | return 0; | |
59 | } | |
60 | ||
4cc7720c | 61 | static int crypto_check_alg(struct crypto_alg *alg) |
cce9e06d | 62 | { |
cce9e06d HX |
63 | if (alg->cra_alignmask & (alg->cra_alignmask + 1)) |
64 | return -EINVAL; | |
65 | ||
66 | if (alg->cra_alignmask & alg->cra_blocksize) | |
67 | return -EINVAL; | |
68 | ||
69 | if (alg->cra_blocksize > PAGE_SIZE / 8) | |
70 | return -EINVAL; | |
71 | ||
72 | if (alg->cra_priority < 0) | |
73 | return -EINVAL; | |
cce9e06d | 74 | |
4cc7720c HX |
75 | return crypto_set_driver_name(alg); |
76 | } | |
77 | ||
6bfd4809 HX |
78 | static void crypto_destroy_instance(struct crypto_alg *alg) |
79 | { | |
80 | struct crypto_instance *inst = (void *)alg; | |
81 | struct crypto_template *tmpl = inst->tmpl; | |
82 | ||
83 | tmpl->free(inst); | |
84 | crypto_tmpl_put(tmpl); | |
85 | } | |
86 | ||
a73e6996 HX |
87 | static void crypto_remove_spawn(struct crypto_spawn *spawn, |
88 | struct list_head *list, | |
89 | struct list_head *secondary_spawns) | |
6bfd4809 | 90 | { |
a73e6996 HX |
91 | struct crypto_instance *inst = spawn->inst; |
92 | struct crypto_template *tmpl = inst->tmpl; | |
6bfd4809 | 93 | |
a73e6996 HX |
94 | list_del_init(&spawn->list); |
95 | spawn->alg = NULL; | |
6bfd4809 | 96 | |
a73e6996 HX |
97 | if (crypto_is_dead(&inst->alg)) |
98 | return; | |
6bfd4809 | 99 | |
a73e6996 HX |
100 | inst->alg.cra_flags |= CRYPTO_ALG_DEAD; |
101 | if (!tmpl || !crypto_tmpl_get(tmpl)) | |
102 | return; | |
103 | ||
104 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg); | |
105 | list_move(&inst->alg.cra_list, list); | |
106 | hlist_del(&inst->list); | |
107 | inst->alg.cra_destroy = crypto_destroy_instance; | |
108 | ||
109 | list_splice(&inst->alg.cra_users, secondary_spawns); | |
110 | } | |
111 | ||
112 | static void crypto_remove_spawns(struct list_head *spawns, | |
113 | struct list_head *list, u32 new_type) | |
114 | { | |
115 | struct crypto_spawn *spawn, *n; | |
116 | LIST_HEAD(secondary_spawns); | |
6bfd4809 | 117 | |
a73e6996 HX |
118 | list_for_each_entry_safe(spawn, n, spawns, list) { |
119 | if ((spawn->alg->cra_flags ^ new_type) & spawn->mask) | |
6bfd4809 HX |
120 | continue; |
121 | ||
a73e6996 HX |
122 | crypto_remove_spawn(spawn, list, &secondary_spawns); |
123 | } | |
6bfd4809 | 124 | |
a73e6996 HX |
125 | while (!list_empty(&secondary_spawns)) { |
126 | list_for_each_entry_safe(spawn, n, &secondary_spawns, list) | |
127 | crypto_remove_spawn(spawn, list, &secondary_spawns); | |
6bfd4809 HX |
128 | } |
129 | } | |
130 | ||
131 | static int __crypto_register_alg(struct crypto_alg *alg, | |
132 | struct list_head *list) | |
4cc7720c HX |
133 | { |
134 | struct crypto_alg *q; | |
6bfd4809 HX |
135 | int ret = -EAGAIN; |
136 | ||
137 | if (crypto_is_dead(alg)) | |
138 | goto out; | |
139 | ||
140 | INIT_LIST_HEAD(&alg->cra_users); | |
141 | ||
142 | ret = -EEXIST; | |
4cc7720c | 143 | |
2825982d | 144 | atomic_set(&alg->cra_refcnt, 1); |
cce9e06d | 145 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
4cc7720c | 146 | if (q == alg) |
cce9e06d | 147 | goto out; |
6bfd4809 HX |
148 | |
149 | if (crypto_is_moribund(q)) | |
150 | continue; | |
151 | ||
152 | if (crypto_is_larval(q)) { | |
2825982d HX |
153 | struct crypto_larval *larval = (void *)q; |
154 | ||
6bfd4809 HX |
155 | if (strcmp(alg->cra_name, q->cra_name) && |
156 | strcmp(alg->cra_driver_name, q->cra_name)) | |
157 | continue; | |
158 | ||
159 | if (larval->adult) | |
160 | continue; | |
492e2b63 HX |
161 | if ((q->cra_flags ^ alg->cra_flags) & larval->mask) |
162 | continue; | |
2825982d HX |
163 | if (!crypto_mod_get(alg)) |
164 | continue; | |
6bfd4809 | 165 | |
2825982d | 166 | larval->adult = alg; |
fe3c5206 | 167 | complete_all(&larval->completion); |
6bfd4809 | 168 | continue; |
2825982d | 169 | } |
6bfd4809 HX |
170 | |
171 | if (strcmp(alg->cra_name, q->cra_name)) | |
172 | continue; | |
173 | ||
174 | if (strcmp(alg->cra_driver_name, q->cra_driver_name) && | |
175 | q->cra_priority > alg->cra_priority) | |
176 | continue; | |
177 | ||
a73e6996 | 178 | crypto_remove_spawns(&q->cra_users, list, alg->cra_flags); |
cce9e06d HX |
179 | } |
180 | ||
181 | list_add(&alg->cra_list, &crypto_alg_list); | |
2825982d HX |
182 | |
183 | crypto_notify(CRYPTO_MSG_ALG_REGISTER, alg); | |
4cc7720c | 184 | ret = 0; |
2825982d | 185 | |
cce9e06d | 186 | out: |
cce9e06d HX |
187 | return ret; |
188 | } | |
4cc7720c | 189 | |
6bfd4809 HX |
190 | static void crypto_remove_final(struct list_head *list) |
191 | { | |
192 | struct crypto_alg *alg; | |
193 | struct crypto_alg *n; | |
194 | ||
195 | list_for_each_entry_safe(alg, n, list, cra_list) { | |
196 | list_del_init(&alg->cra_list); | |
197 | crypto_alg_put(alg); | |
198 | } | |
199 | } | |
200 | ||
4cc7720c HX |
201 | int crypto_register_alg(struct crypto_alg *alg) |
202 | { | |
6bfd4809 | 203 | LIST_HEAD(list); |
4cc7720c HX |
204 | int err; |
205 | ||
206 | err = crypto_check_alg(alg); | |
207 | if (err) | |
208 | return err; | |
209 | ||
210 | down_write(&crypto_alg_sem); | |
6bfd4809 | 211 | err = __crypto_register_alg(alg, &list); |
4cc7720c HX |
212 | up_write(&crypto_alg_sem); |
213 | ||
6bfd4809 | 214 | crypto_remove_final(&list); |
4cc7720c HX |
215 | return err; |
216 | } | |
cce9e06d HX |
217 | EXPORT_SYMBOL_GPL(crypto_register_alg); |
218 | ||
6bfd4809 HX |
219 | static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list) |
220 | { | |
221 | if (unlikely(list_empty(&alg->cra_list))) | |
222 | return -ENOENT; | |
223 | ||
224 | alg->cra_flags |= CRYPTO_ALG_DEAD; | |
225 | ||
226 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg); | |
227 | list_del_init(&alg->cra_list); | |
a73e6996 | 228 | crypto_remove_spawns(&alg->cra_users, list, alg->cra_flags); |
6bfd4809 HX |
229 | |
230 | return 0; | |
231 | } | |
232 | ||
cce9e06d HX |
233 | int crypto_unregister_alg(struct crypto_alg *alg) |
234 | { | |
6bfd4809 HX |
235 | int ret; |
236 | LIST_HEAD(list); | |
cce9e06d HX |
237 | |
238 | down_write(&crypto_alg_sem); | |
6bfd4809 | 239 | ret = crypto_remove_alg(alg, &list); |
cce9e06d HX |
240 | up_write(&crypto_alg_sem); |
241 | ||
242 | if (ret) | |
243 | return ret; | |
244 | ||
245 | BUG_ON(atomic_read(&alg->cra_refcnt) != 1); | |
246 | if (alg->cra_destroy) | |
247 | alg->cra_destroy(alg); | |
248 | ||
6bfd4809 | 249 | crypto_remove_final(&list); |
cce9e06d HX |
250 | return 0; |
251 | } | |
252 | EXPORT_SYMBOL_GPL(crypto_unregister_alg); | |
253 | ||
4cc7720c HX |
254 | int crypto_register_template(struct crypto_template *tmpl) |
255 | { | |
256 | struct crypto_template *q; | |
257 | int err = -EEXIST; | |
258 | ||
259 | down_write(&crypto_alg_sem); | |
260 | ||
261 | list_for_each_entry(q, &crypto_template_list, list) { | |
262 | if (q == tmpl) | |
263 | goto out; | |
264 | } | |
265 | ||
266 | list_add(&tmpl->list, &crypto_template_list); | |
2825982d | 267 | crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl); |
4cc7720c HX |
268 | err = 0; |
269 | out: | |
270 | up_write(&crypto_alg_sem); | |
271 | return err; | |
272 | } | |
273 | EXPORT_SYMBOL_GPL(crypto_register_template); | |
274 | ||
275 | void crypto_unregister_template(struct crypto_template *tmpl) | |
276 | { | |
277 | struct crypto_instance *inst; | |
278 | struct hlist_node *p, *n; | |
279 | struct hlist_head *list; | |
6bfd4809 | 280 | LIST_HEAD(users); |
4cc7720c HX |
281 | |
282 | down_write(&crypto_alg_sem); | |
283 | ||
284 | BUG_ON(list_empty(&tmpl->list)); | |
285 | list_del_init(&tmpl->list); | |
286 | ||
287 | list = &tmpl->instances; | |
288 | hlist_for_each_entry(inst, p, list, list) { | |
6bfd4809 HX |
289 | int err = crypto_remove_alg(&inst->alg, &users); |
290 | BUG_ON(err); | |
4cc7720c HX |
291 | } |
292 | ||
2825982d HX |
293 | crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl); |
294 | ||
4cc7720c HX |
295 | up_write(&crypto_alg_sem); |
296 | ||
297 | hlist_for_each_entry_safe(inst, p, n, list, list) { | |
298 | BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1); | |
299 | tmpl->free(inst); | |
300 | } | |
6bfd4809 | 301 | crypto_remove_final(&users); |
4cc7720c HX |
302 | } |
303 | EXPORT_SYMBOL_GPL(crypto_unregister_template); | |
304 | ||
305 | static struct crypto_template *__crypto_lookup_template(const char *name) | |
306 | { | |
307 | struct crypto_template *q, *tmpl = NULL; | |
308 | ||
309 | down_read(&crypto_alg_sem); | |
310 | list_for_each_entry(q, &crypto_template_list, list) { | |
311 | if (strcmp(q->name, name)) | |
312 | continue; | |
313 | if (unlikely(!crypto_tmpl_get(q))) | |
314 | continue; | |
315 | ||
316 | tmpl = q; | |
317 | break; | |
318 | } | |
319 | up_read(&crypto_alg_sem); | |
320 | ||
321 | return tmpl; | |
322 | } | |
323 | ||
324 | struct crypto_template *crypto_lookup_template(const char *name) | |
325 | { | |
326 | return try_then_request_module(__crypto_lookup_template(name), name); | |
327 | } | |
328 | EXPORT_SYMBOL_GPL(crypto_lookup_template); | |
329 | ||
330 | int crypto_register_instance(struct crypto_template *tmpl, | |
331 | struct crypto_instance *inst) | |
332 | { | |
6bfd4809 | 333 | LIST_HEAD(list); |
4cc7720c HX |
334 | int err = -EINVAL; |
335 | ||
336 | if (inst->alg.cra_destroy) | |
337 | goto err; | |
338 | ||
339 | err = crypto_check_alg(&inst->alg); | |
340 | if (err) | |
341 | goto err; | |
342 | ||
343 | inst->alg.cra_module = tmpl->module; | |
344 | ||
345 | down_write(&crypto_alg_sem); | |
346 | ||
6bfd4809 | 347 | err = __crypto_register_alg(&inst->alg, &list); |
4cc7720c HX |
348 | if (err) |
349 | goto unlock; | |
350 | ||
351 | hlist_add_head(&inst->list, &tmpl->instances); | |
352 | inst->tmpl = tmpl; | |
353 | ||
354 | unlock: | |
355 | up_write(&crypto_alg_sem); | |
356 | ||
6bfd4809 HX |
357 | crypto_remove_final(&list); |
358 | ||
4cc7720c HX |
359 | err: |
360 | return err; | |
361 | } | |
362 | EXPORT_SYMBOL_GPL(crypto_register_instance); | |
363 | ||
6bfd4809 | 364 | int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, |
a73e6996 | 365 | struct crypto_instance *inst, u32 mask) |
6bfd4809 HX |
366 | { |
367 | int err = -EAGAIN; | |
368 | ||
369 | spawn->inst = inst; | |
a73e6996 | 370 | spawn->mask = mask; |
6bfd4809 HX |
371 | |
372 | down_write(&crypto_alg_sem); | |
373 | if (!crypto_is_moribund(alg)) { | |
374 | list_add(&spawn->list, &alg->cra_users); | |
375 | spawn->alg = alg; | |
376 | err = 0; | |
377 | } | |
378 | up_write(&crypto_alg_sem); | |
379 | ||
380 | return err; | |
381 | } | |
382 | EXPORT_SYMBOL_GPL(crypto_init_spawn); | |
383 | ||
384 | void crypto_drop_spawn(struct crypto_spawn *spawn) | |
385 | { | |
386 | down_write(&crypto_alg_sem); | |
387 | list_del(&spawn->list); | |
388 | up_write(&crypto_alg_sem); | |
389 | } | |
390 | EXPORT_SYMBOL_GPL(crypto_drop_spawn); | |
391 | ||
2e306ee0 HX |
392 | struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, |
393 | u32 mask) | |
6bfd4809 HX |
394 | { |
395 | struct crypto_alg *alg; | |
396 | struct crypto_alg *alg2; | |
397 | struct crypto_tfm *tfm; | |
398 | ||
399 | down_read(&crypto_alg_sem); | |
400 | alg = spawn->alg; | |
401 | alg2 = alg; | |
402 | if (alg2) | |
403 | alg2 = crypto_mod_get(alg2); | |
404 | up_read(&crypto_alg_sem); | |
405 | ||
406 | if (!alg2) { | |
407 | if (alg) | |
408 | crypto_shoot_alg(alg); | |
409 | return ERR_PTR(-EAGAIN); | |
410 | } | |
411 | ||
2e306ee0 HX |
412 | tfm = ERR_PTR(-EINVAL); |
413 | if (unlikely((alg->cra_flags ^ type) & mask)) | |
414 | goto out_put_alg; | |
415 | ||
27d2a330 | 416 | tfm = __crypto_alloc_tfm(alg, type, mask); |
6bfd4809 | 417 | if (IS_ERR(tfm)) |
2e306ee0 HX |
418 | goto out_put_alg; |
419 | ||
420 | return tfm; | |
6bfd4809 | 421 | |
2e306ee0 HX |
422 | out_put_alg: |
423 | crypto_mod_put(alg); | |
6bfd4809 HX |
424 | return tfm; |
425 | } | |
426 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm); | |
427 | ||
2825982d HX |
428 | int crypto_register_notifier(struct notifier_block *nb) |
429 | { | |
430 | return blocking_notifier_chain_register(&crypto_chain, nb); | |
431 | } | |
432 | EXPORT_SYMBOL_GPL(crypto_register_notifier); | |
433 | ||
434 | int crypto_unregister_notifier(struct notifier_block *nb) | |
435 | { | |
436 | return blocking_notifier_chain_unregister(&crypto_chain, nb); | |
437 | } | |
438 | EXPORT_SYMBOL_GPL(crypto_unregister_notifier); | |
439 | ||
ebc610e5 | 440 | struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb) |
7fed0bf2 | 441 | { |
ebc610e5 HX |
442 | struct rtattr *rta = tb[CRYPTOA_TYPE - 1]; |
443 | struct crypto_attr_type *algt; | |
444 | ||
445 | if (!rta) | |
446 | return ERR_PTR(-ENOENT); | |
447 | if (RTA_PAYLOAD(rta) < sizeof(*algt)) | |
448 | return ERR_PTR(-EINVAL); | |
449 | ||
450 | algt = RTA_DATA(rta); | |
451 | ||
452 | return algt; | |
453 | } | |
454 | EXPORT_SYMBOL_GPL(crypto_get_attr_type); | |
455 | ||
456 | int crypto_check_attr_type(struct rtattr **tb, u32 type) | |
457 | { | |
458 | struct crypto_attr_type *algt; | |
459 | ||
460 | algt = crypto_get_attr_type(tb); | |
461 | if (IS_ERR(algt)) | |
462 | return PTR_ERR(algt); | |
463 | ||
464 | if ((algt->type ^ type) & algt->mask) | |
465 | return -EINVAL; | |
466 | ||
467 | return 0; | |
468 | } | |
469 | EXPORT_SYMBOL_GPL(crypto_check_attr_type); | |
470 | ||
471 | struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb, u32 type, u32 mask) | |
472 | { | |
473 | struct rtattr *rta = tb[CRYPTOA_ALG - 1]; | |
7fed0bf2 HX |
474 | struct crypto_attr_alg *alga; |
475 | ||
ebc610e5 HX |
476 | if (!rta) |
477 | return ERR_PTR(-ENOENT); | |
478 | if (RTA_PAYLOAD(rta) < sizeof(*alga)) | |
7fed0bf2 HX |
479 | return ERR_PTR(-EINVAL); |
480 | ||
481 | alga = RTA_DATA(rta); | |
482 | alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0; | |
483 | ||
484 | return crypto_alg_mod_lookup(alga->name, type, mask); | |
485 | } | |
486 | EXPORT_SYMBOL_GPL(crypto_get_attr_alg); | |
487 | ||
488 | struct crypto_instance *crypto_alloc_instance(const char *name, | |
489 | struct crypto_alg *alg) | |
490 | { | |
491 | struct crypto_instance *inst; | |
492 | struct crypto_spawn *spawn; | |
493 | int err; | |
494 | ||
495 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); | |
496 | if (!inst) | |
497 | return ERR_PTR(-ENOMEM); | |
498 | ||
499 | err = -ENAMETOOLONG; | |
500 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name, | |
501 | alg->cra_name) >= CRYPTO_MAX_ALG_NAME) | |
502 | goto err_free_inst; | |
503 | ||
504 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", | |
505 | name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) | |
506 | goto err_free_inst; | |
507 | ||
508 | spawn = crypto_instance_ctx(inst); | |
a73e6996 HX |
509 | err = crypto_init_spawn(spawn, alg, inst, |
510 | CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); | |
7fed0bf2 HX |
511 | |
512 | if (err) | |
513 | goto err_free_inst; | |
514 | ||
515 | return inst; | |
516 | ||
517 | err_free_inst: | |
518 | kfree(inst); | |
519 | return ERR_PTR(err); | |
520 | } | |
521 | EXPORT_SYMBOL_GPL(crypto_alloc_instance); | |
522 | ||
b5b7f088 HX |
523 | void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen) |
524 | { | |
525 | INIT_LIST_HEAD(&queue->list); | |
526 | queue->backlog = &queue->list; | |
527 | queue->qlen = 0; | |
528 | queue->max_qlen = max_qlen; | |
529 | } | |
530 | EXPORT_SYMBOL_GPL(crypto_init_queue); | |
531 | ||
532 | int crypto_enqueue_request(struct crypto_queue *queue, | |
533 | struct crypto_async_request *request) | |
534 | { | |
535 | int err = -EINPROGRESS; | |
536 | ||
537 | if (unlikely(queue->qlen >= queue->max_qlen)) { | |
538 | err = -EBUSY; | |
539 | if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) | |
540 | goto out; | |
541 | if (queue->backlog == &queue->list) | |
542 | queue->backlog = &request->list; | |
543 | } | |
544 | ||
545 | queue->qlen++; | |
546 | list_add_tail(&request->list, &queue->list); | |
547 | ||
548 | out: | |
549 | return err; | |
550 | } | |
551 | EXPORT_SYMBOL_GPL(crypto_enqueue_request); | |
552 | ||
553 | struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) | |
554 | { | |
555 | struct list_head *request; | |
556 | ||
557 | if (unlikely(!queue->qlen)) | |
558 | return NULL; | |
559 | ||
560 | queue->qlen--; | |
561 | ||
562 | if (queue->backlog != &queue->list) | |
563 | queue->backlog = queue->backlog->next; | |
564 | ||
565 | request = queue->list.next; | |
566 | list_del(request); | |
567 | ||
568 | return list_entry(request, struct crypto_async_request, list); | |
569 | } | |
570 | EXPORT_SYMBOL_GPL(crypto_dequeue_request); | |
571 | ||
572 | int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm) | |
573 | { | |
574 | struct crypto_async_request *req; | |
575 | ||
576 | list_for_each_entry(req, &queue->list, list) { | |
577 | if (req->tfm == tfm) | |
578 | return 1; | |
579 | } | |
580 | ||
581 | return 0; | |
582 | } | |
583 | EXPORT_SYMBOL_GPL(crypto_tfm_in_queue); | |
584 | ||
cce9e06d HX |
585 | static int __init crypto_algapi_init(void) |
586 | { | |
587 | crypto_init_proc(); | |
588 | return 0; | |
589 | } | |
590 | ||
591 | static void __exit crypto_algapi_exit(void) | |
592 | { | |
593 | crypto_exit_proc(); | |
594 | } | |
595 | ||
596 | module_init(crypto_algapi_init); | |
597 | module_exit(crypto_algapi_exit); | |
598 | ||
599 | MODULE_LICENSE("GPL"); | |
600 | MODULE_DESCRIPTION("Cryptographic algorithms API"); |