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Commit | Line | Data |
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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 | ||
cce9e06d HX |
66 | if (alg->cra_blocksize > PAGE_SIZE / 8) |
67 | return -EINVAL; | |
68 | ||
69 | if (alg->cra_priority < 0) | |
70 | return -EINVAL; | |
cce9e06d | 71 | |
4cc7720c HX |
72 | return crypto_set_driver_name(alg); |
73 | } | |
74 | ||
6bfd4809 HX |
75 | static void crypto_destroy_instance(struct crypto_alg *alg) |
76 | { | |
77 | struct crypto_instance *inst = (void *)alg; | |
78 | struct crypto_template *tmpl = inst->tmpl; | |
79 | ||
80 | tmpl->free(inst); | |
81 | crypto_tmpl_put(tmpl); | |
82 | } | |
83 | ||
a73e6996 HX |
84 | static void crypto_remove_spawn(struct crypto_spawn *spawn, |
85 | struct list_head *list, | |
86 | struct list_head *secondary_spawns) | |
6bfd4809 | 87 | { |
a73e6996 HX |
88 | struct crypto_instance *inst = spawn->inst; |
89 | struct crypto_template *tmpl = inst->tmpl; | |
6bfd4809 | 90 | |
a73e6996 HX |
91 | list_del_init(&spawn->list); |
92 | spawn->alg = NULL; | |
6bfd4809 | 93 | |
a73e6996 HX |
94 | if (crypto_is_dead(&inst->alg)) |
95 | return; | |
6bfd4809 | 96 | |
a73e6996 HX |
97 | inst->alg.cra_flags |= CRYPTO_ALG_DEAD; |
98 | if (!tmpl || !crypto_tmpl_get(tmpl)) | |
99 | return; | |
100 | ||
101 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg); | |
102 | list_move(&inst->alg.cra_list, list); | |
103 | hlist_del(&inst->list); | |
104 | inst->alg.cra_destroy = crypto_destroy_instance; | |
105 | ||
106 | list_splice(&inst->alg.cra_users, secondary_spawns); | |
107 | } | |
108 | ||
109 | static void crypto_remove_spawns(struct list_head *spawns, | |
110 | struct list_head *list, u32 new_type) | |
111 | { | |
112 | struct crypto_spawn *spawn, *n; | |
113 | LIST_HEAD(secondary_spawns); | |
6bfd4809 | 114 | |
a73e6996 HX |
115 | list_for_each_entry_safe(spawn, n, spawns, list) { |
116 | if ((spawn->alg->cra_flags ^ new_type) & spawn->mask) | |
6bfd4809 HX |
117 | continue; |
118 | ||
a73e6996 HX |
119 | crypto_remove_spawn(spawn, list, &secondary_spawns); |
120 | } | |
6bfd4809 | 121 | |
a73e6996 HX |
122 | while (!list_empty(&secondary_spawns)) { |
123 | list_for_each_entry_safe(spawn, n, &secondary_spawns, list) | |
124 | crypto_remove_spawn(spawn, list, &secondary_spawns); | |
6bfd4809 HX |
125 | } |
126 | } | |
127 | ||
128 | static int __crypto_register_alg(struct crypto_alg *alg, | |
129 | struct list_head *list) | |
4cc7720c HX |
130 | { |
131 | struct crypto_alg *q; | |
6bfd4809 HX |
132 | int ret = -EAGAIN; |
133 | ||
134 | if (crypto_is_dead(alg)) | |
135 | goto out; | |
136 | ||
137 | INIT_LIST_HEAD(&alg->cra_users); | |
138 | ||
139 | ret = -EEXIST; | |
4cc7720c | 140 | |
2825982d | 141 | atomic_set(&alg->cra_refcnt, 1); |
cce9e06d | 142 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
4cc7720c | 143 | if (q == alg) |
cce9e06d | 144 | goto out; |
6bfd4809 HX |
145 | |
146 | if (crypto_is_moribund(q)) | |
147 | continue; | |
148 | ||
149 | if (crypto_is_larval(q)) { | |
2825982d HX |
150 | struct crypto_larval *larval = (void *)q; |
151 | ||
6bfd4809 HX |
152 | if (strcmp(alg->cra_name, q->cra_name) && |
153 | strcmp(alg->cra_driver_name, q->cra_name)) | |
154 | continue; | |
155 | ||
156 | if (larval->adult) | |
157 | continue; | |
492e2b63 HX |
158 | if ((q->cra_flags ^ alg->cra_flags) & larval->mask) |
159 | continue; | |
2825982d HX |
160 | if (!crypto_mod_get(alg)) |
161 | continue; | |
6bfd4809 | 162 | |
2825982d | 163 | larval->adult = alg; |
fe3c5206 | 164 | complete_all(&larval->completion); |
6bfd4809 | 165 | continue; |
2825982d | 166 | } |
6bfd4809 HX |
167 | |
168 | if (strcmp(alg->cra_name, q->cra_name)) | |
169 | continue; | |
170 | ||
171 | if (strcmp(alg->cra_driver_name, q->cra_driver_name) && | |
172 | q->cra_priority > alg->cra_priority) | |
173 | continue; | |
174 | ||
a73e6996 | 175 | crypto_remove_spawns(&q->cra_users, list, alg->cra_flags); |
cce9e06d HX |
176 | } |
177 | ||
178 | list_add(&alg->cra_list, &crypto_alg_list); | |
2825982d HX |
179 | |
180 | crypto_notify(CRYPTO_MSG_ALG_REGISTER, alg); | |
4cc7720c | 181 | ret = 0; |
2825982d | 182 | |
cce9e06d | 183 | out: |
cce9e06d HX |
184 | return ret; |
185 | } | |
4cc7720c | 186 | |
6bfd4809 HX |
187 | static void crypto_remove_final(struct list_head *list) |
188 | { | |
189 | struct crypto_alg *alg; | |
190 | struct crypto_alg *n; | |
191 | ||
192 | list_for_each_entry_safe(alg, n, list, cra_list) { | |
193 | list_del_init(&alg->cra_list); | |
194 | crypto_alg_put(alg); | |
195 | } | |
196 | } | |
197 | ||
4cc7720c HX |
198 | int crypto_register_alg(struct crypto_alg *alg) |
199 | { | |
6bfd4809 | 200 | LIST_HEAD(list); |
4cc7720c HX |
201 | int err; |
202 | ||
203 | err = crypto_check_alg(alg); | |
204 | if (err) | |
205 | return err; | |
206 | ||
207 | down_write(&crypto_alg_sem); | |
6bfd4809 | 208 | err = __crypto_register_alg(alg, &list); |
4cc7720c HX |
209 | up_write(&crypto_alg_sem); |
210 | ||
6bfd4809 | 211 | crypto_remove_final(&list); |
4cc7720c HX |
212 | return err; |
213 | } | |
cce9e06d HX |
214 | EXPORT_SYMBOL_GPL(crypto_register_alg); |
215 | ||
6bfd4809 HX |
216 | static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list) |
217 | { | |
218 | if (unlikely(list_empty(&alg->cra_list))) | |
219 | return -ENOENT; | |
220 | ||
221 | alg->cra_flags |= CRYPTO_ALG_DEAD; | |
222 | ||
223 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg); | |
224 | list_del_init(&alg->cra_list); | |
a73e6996 | 225 | crypto_remove_spawns(&alg->cra_users, list, alg->cra_flags); |
6bfd4809 HX |
226 | |
227 | return 0; | |
228 | } | |
229 | ||
cce9e06d HX |
230 | int crypto_unregister_alg(struct crypto_alg *alg) |
231 | { | |
6bfd4809 HX |
232 | int ret; |
233 | LIST_HEAD(list); | |
cce9e06d HX |
234 | |
235 | down_write(&crypto_alg_sem); | |
6bfd4809 | 236 | ret = crypto_remove_alg(alg, &list); |
cce9e06d HX |
237 | up_write(&crypto_alg_sem); |
238 | ||
239 | if (ret) | |
240 | return ret; | |
241 | ||
242 | BUG_ON(atomic_read(&alg->cra_refcnt) != 1); | |
243 | if (alg->cra_destroy) | |
244 | alg->cra_destroy(alg); | |
245 | ||
6bfd4809 | 246 | crypto_remove_final(&list); |
cce9e06d HX |
247 | return 0; |
248 | } | |
249 | EXPORT_SYMBOL_GPL(crypto_unregister_alg); | |
250 | ||
4cc7720c HX |
251 | int crypto_register_template(struct crypto_template *tmpl) |
252 | { | |
253 | struct crypto_template *q; | |
254 | int err = -EEXIST; | |
255 | ||
256 | down_write(&crypto_alg_sem); | |
257 | ||
258 | list_for_each_entry(q, &crypto_template_list, list) { | |
259 | if (q == tmpl) | |
260 | goto out; | |
261 | } | |
262 | ||
263 | list_add(&tmpl->list, &crypto_template_list); | |
2825982d | 264 | crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl); |
4cc7720c HX |
265 | err = 0; |
266 | out: | |
267 | up_write(&crypto_alg_sem); | |
268 | return err; | |
269 | } | |
270 | EXPORT_SYMBOL_GPL(crypto_register_template); | |
271 | ||
272 | void crypto_unregister_template(struct crypto_template *tmpl) | |
273 | { | |
274 | struct crypto_instance *inst; | |
275 | struct hlist_node *p, *n; | |
276 | struct hlist_head *list; | |
6bfd4809 | 277 | LIST_HEAD(users); |
4cc7720c HX |
278 | |
279 | down_write(&crypto_alg_sem); | |
280 | ||
281 | BUG_ON(list_empty(&tmpl->list)); | |
282 | list_del_init(&tmpl->list); | |
283 | ||
284 | list = &tmpl->instances; | |
285 | hlist_for_each_entry(inst, p, list, list) { | |
6bfd4809 HX |
286 | int err = crypto_remove_alg(&inst->alg, &users); |
287 | BUG_ON(err); | |
4cc7720c HX |
288 | } |
289 | ||
2825982d HX |
290 | crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl); |
291 | ||
4cc7720c HX |
292 | up_write(&crypto_alg_sem); |
293 | ||
294 | hlist_for_each_entry_safe(inst, p, n, list, list) { | |
295 | BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1); | |
296 | tmpl->free(inst); | |
297 | } | |
6bfd4809 | 298 | crypto_remove_final(&users); |
4cc7720c HX |
299 | } |
300 | EXPORT_SYMBOL_GPL(crypto_unregister_template); | |
301 | ||
302 | static struct crypto_template *__crypto_lookup_template(const char *name) | |
303 | { | |
304 | struct crypto_template *q, *tmpl = NULL; | |
305 | ||
306 | down_read(&crypto_alg_sem); | |
307 | list_for_each_entry(q, &crypto_template_list, list) { | |
308 | if (strcmp(q->name, name)) | |
309 | continue; | |
310 | if (unlikely(!crypto_tmpl_get(q))) | |
311 | continue; | |
312 | ||
313 | tmpl = q; | |
314 | break; | |
315 | } | |
316 | up_read(&crypto_alg_sem); | |
317 | ||
318 | return tmpl; | |
319 | } | |
320 | ||
321 | struct crypto_template *crypto_lookup_template(const char *name) | |
322 | { | |
323 | return try_then_request_module(__crypto_lookup_template(name), name); | |
324 | } | |
325 | EXPORT_SYMBOL_GPL(crypto_lookup_template); | |
326 | ||
327 | int crypto_register_instance(struct crypto_template *tmpl, | |
328 | struct crypto_instance *inst) | |
329 | { | |
6bfd4809 | 330 | LIST_HEAD(list); |
4cc7720c HX |
331 | int err = -EINVAL; |
332 | ||
333 | if (inst->alg.cra_destroy) | |
334 | goto err; | |
335 | ||
336 | err = crypto_check_alg(&inst->alg); | |
337 | if (err) | |
338 | goto err; | |
339 | ||
340 | inst->alg.cra_module = tmpl->module; | |
341 | ||
342 | down_write(&crypto_alg_sem); | |
343 | ||
6bfd4809 | 344 | err = __crypto_register_alg(&inst->alg, &list); |
4cc7720c HX |
345 | if (err) |
346 | goto unlock; | |
347 | ||
348 | hlist_add_head(&inst->list, &tmpl->instances); | |
349 | inst->tmpl = tmpl; | |
350 | ||
351 | unlock: | |
352 | up_write(&crypto_alg_sem); | |
353 | ||
6bfd4809 HX |
354 | crypto_remove_final(&list); |
355 | ||
4cc7720c HX |
356 | err: |
357 | return err; | |
358 | } | |
359 | EXPORT_SYMBOL_GPL(crypto_register_instance); | |
360 | ||
6bfd4809 | 361 | int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, |
a73e6996 | 362 | struct crypto_instance *inst, u32 mask) |
6bfd4809 HX |
363 | { |
364 | int err = -EAGAIN; | |
365 | ||
366 | spawn->inst = inst; | |
a73e6996 | 367 | spawn->mask = mask; |
6bfd4809 HX |
368 | |
369 | down_write(&crypto_alg_sem); | |
370 | if (!crypto_is_moribund(alg)) { | |
371 | list_add(&spawn->list, &alg->cra_users); | |
372 | spawn->alg = alg; | |
373 | err = 0; | |
374 | } | |
375 | up_write(&crypto_alg_sem); | |
376 | ||
377 | return err; | |
378 | } | |
379 | EXPORT_SYMBOL_GPL(crypto_init_spawn); | |
380 | ||
381 | void crypto_drop_spawn(struct crypto_spawn *spawn) | |
382 | { | |
383 | down_write(&crypto_alg_sem); | |
384 | list_del(&spawn->list); | |
385 | up_write(&crypto_alg_sem); | |
386 | } | |
387 | EXPORT_SYMBOL_GPL(crypto_drop_spawn); | |
388 | ||
2e306ee0 HX |
389 | struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, |
390 | u32 mask) | |
6bfd4809 HX |
391 | { |
392 | struct crypto_alg *alg; | |
393 | struct crypto_alg *alg2; | |
394 | struct crypto_tfm *tfm; | |
395 | ||
396 | down_read(&crypto_alg_sem); | |
397 | alg = spawn->alg; | |
398 | alg2 = alg; | |
399 | if (alg2) | |
400 | alg2 = crypto_mod_get(alg2); | |
401 | up_read(&crypto_alg_sem); | |
402 | ||
403 | if (!alg2) { | |
404 | if (alg) | |
405 | crypto_shoot_alg(alg); | |
406 | return ERR_PTR(-EAGAIN); | |
407 | } | |
408 | ||
2e306ee0 HX |
409 | tfm = ERR_PTR(-EINVAL); |
410 | if (unlikely((alg->cra_flags ^ type) & mask)) | |
411 | goto out_put_alg; | |
412 | ||
27d2a330 | 413 | tfm = __crypto_alloc_tfm(alg, type, mask); |
6bfd4809 | 414 | if (IS_ERR(tfm)) |
2e306ee0 HX |
415 | goto out_put_alg; |
416 | ||
417 | return tfm; | |
6bfd4809 | 418 | |
2e306ee0 HX |
419 | out_put_alg: |
420 | crypto_mod_put(alg); | |
6bfd4809 HX |
421 | return tfm; |
422 | } | |
423 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm); | |
424 | ||
2825982d HX |
425 | int crypto_register_notifier(struct notifier_block *nb) |
426 | { | |
427 | return blocking_notifier_chain_register(&crypto_chain, nb); | |
428 | } | |
429 | EXPORT_SYMBOL_GPL(crypto_register_notifier); | |
430 | ||
431 | int crypto_unregister_notifier(struct notifier_block *nb) | |
432 | { | |
433 | return blocking_notifier_chain_unregister(&crypto_chain, nb); | |
434 | } | |
435 | EXPORT_SYMBOL_GPL(crypto_unregister_notifier); | |
436 | ||
ebc610e5 | 437 | struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb) |
7fed0bf2 | 438 | { |
39e1ee01 | 439 | struct rtattr *rta = tb[0]; |
ebc610e5 HX |
440 | struct crypto_attr_type *algt; |
441 | ||
442 | if (!rta) | |
443 | return ERR_PTR(-ENOENT); | |
444 | if (RTA_PAYLOAD(rta) < sizeof(*algt)) | |
445 | return ERR_PTR(-EINVAL); | |
39e1ee01 HX |
446 | if (rta->rta_type != CRYPTOA_TYPE) |
447 | return ERR_PTR(-EINVAL); | |
ebc610e5 HX |
448 | |
449 | algt = RTA_DATA(rta); | |
450 | ||
451 | return algt; | |
452 | } | |
453 | EXPORT_SYMBOL_GPL(crypto_get_attr_type); | |
454 | ||
455 | int crypto_check_attr_type(struct rtattr **tb, u32 type) | |
456 | { | |
457 | struct crypto_attr_type *algt; | |
458 | ||
459 | algt = crypto_get_attr_type(tb); | |
460 | if (IS_ERR(algt)) | |
461 | return PTR_ERR(algt); | |
462 | ||
463 | if ((algt->type ^ type) & algt->mask) | |
464 | return -EINVAL; | |
465 | ||
466 | return 0; | |
467 | } | |
468 | EXPORT_SYMBOL_GPL(crypto_check_attr_type); | |
469 | ||
3c09f17c | 470 | struct crypto_alg *crypto_attr_alg(struct rtattr *rta, u32 type, u32 mask) |
ebc610e5 | 471 | { |
7fed0bf2 HX |
472 | struct crypto_attr_alg *alga; |
473 | ||
ebc610e5 HX |
474 | if (!rta) |
475 | return ERR_PTR(-ENOENT); | |
476 | if (RTA_PAYLOAD(rta) < sizeof(*alga)) | |
7fed0bf2 | 477 | return ERR_PTR(-EINVAL); |
39e1ee01 HX |
478 | if (rta->rta_type != CRYPTOA_ALG) |
479 | return ERR_PTR(-EINVAL); | |
7fed0bf2 HX |
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 | } | |
3c09f17c HX |
486 | EXPORT_SYMBOL_GPL(crypto_attr_alg); |
487 | ||
488 | int crypto_attr_u32(struct rtattr *rta, u32 *num) | |
489 | { | |
490 | struct crypto_attr_u32 *nu32; | |
491 | ||
492 | if (!rta) | |
493 | return -ENOENT; | |
494 | if (RTA_PAYLOAD(rta) < sizeof(*nu32)) | |
495 | return -EINVAL; | |
496 | if (rta->rta_type != CRYPTOA_U32) | |
497 | return -EINVAL; | |
498 | ||
499 | nu32 = RTA_DATA(rta); | |
500 | *num = nu32->num; | |
501 | ||
502 | return 0; | |
503 | } | |
504 | EXPORT_SYMBOL_GPL(crypto_attr_u32); | |
7fed0bf2 HX |
505 | |
506 | struct crypto_instance *crypto_alloc_instance(const char *name, | |
507 | struct crypto_alg *alg) | |
508 | { | |
509 | struct crypto_instance *inst; | |
510 | struct crypto_spawn *spawn; | |
511 | int err; | |
512 | ||
513 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); | |
514 | if (!inst) | |
515 | return ERR_PTR(-ENOMEM); | |
516 | ||
517 | err = -ENAMETOOLONG; | |
518 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name, | |
519 | alg->cra_name) >= CRYPTO_MAX_ALG_NAME) | |
520 | goto err_free_inst; | |
521 | ||
522 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", | |
523 | name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) | |
524 | goto err_free_inst; | |
525 | ||
526 | spawn = crypto_instance_ctx(inst); | |
a73e6996 HX |
527 | err = crypto_init_spawn(spawn, alg, inst, |
528 | CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); | |
7fed0bf2 HX |
529 | |
530 | if (err) | |
531 | goto err_free_inst; | |
532 | ||
533 | return inst; | |
534 | ||
535 | err_free_inst: | |
536 | kfree(inst); | |
537 | return ERR_PTR(err); | |
538 | } | |
539 | EXPORT_SYMBOL_GPL(crypto_alloc_instance); | |
540 | ||
b5b7f088 HX |
541 | void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen) |
542 | { | |
543 | INIT_LIST_HEAD(&queue->list); | |
544 | queue->backlog = &queue->list; | |
545 | queue->qlen = 0; | |
546 | queue->max_qlen = max_qlen; | |
547 | } | |
548 | EXPORT_SYMBOL_GPL(crypto_init_queue); | |
549 | ||
550 | int crypto_enqueue_request(struct crypto_queue *queue, | |
551 | struct crypto_async_request *request) | |
552 | { | |
553 | int err = -EINPROGRESS; | |
554 | ||
555 | if (unlikely(queue->qlen >= queue->max_qlen)) { | |
556 | err = -EBUSY; | |
557 | if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) | |
558 | goto out; | |
559 | if (queue->backlog == &queue->list) | |
560 | queue->backlog = &request->list; | |
561 | } | |
562 | ||
563 | queue->qlen++; | |
564 | list_add_tail(&request->list, &queue->list); | |
565 | ||
566 | out: | |
567 | return err; | |
568 | } | |
569 | EXPORT_SYMBOL_GPL(crypto_enqueue_request); | |
570 | ||
571 | struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) | |
572 | { | |
573 | struct list_head *request; | |
574 | ||
575 | if (unlikely(!queue->qlen)) | |
576 | return NULL; | |
577 | ||
578 | queue->qlen--; | |
579 | ||
580 | if (queue->backlog != &queue->list) | |
581 | queue->backlog = queue->backlog->next; | |
582 | ||
583 | request = queue->list.next; | |
584 | list_del(request); | |
585 | ||
586 | return list_entry(request, struct crypto_async_request, list); | |
587 | } | |
588 | EXPORT_SYMBOL_GPL(crypto_dequeue_request); | |
589 | ||
590 | int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm) | |
591 | { | |
592 | struct crypto_async_request *req; | |
593 | ||
594 | list_for_each_entry(req, &queue->list, list) { | |
595 | if (req->tfm == tfm) | |
596 | return 1; | |
597 | } | |
598 | ||
599 | return 0; | |
600 | } | |
601 | EXPORT_SYMBOL_GPL(crypto_tfm_in_queue); | |
602 | ||
cce9e06d HX |
603 | static int __init crypto_algapi_init(void) |
604 | { | |
605 | crypto_init_proc(); | |
606 | return 0; | |
607 | } | |
608 | ||
609 | static void __exit crypto_algapi_exit(void) | |
610 | { | |
611 | crypto_exit_proc(); | |
612 | } | |
613 | ||
614 | module_init(crypto_algapi_init); | |
615 | module_exit(crypto_algapi_exit); | |
616 | ||
617 | MODULE_LICENSE("GPL"); | |
618 | MODULE_DESCRIPTION("Cryptographic algorithms API"); |