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 | ||
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 | 97 | inst->alg.cra_flags |= CRYPTO_ALG_DEAD; |
38cb2419 HX |
98 | if (hlist_unhashed(&inst->list)) |
99 | return; | |
100 | ||
a73e6996 HX |
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 | ||
d8058480 HX |
155 | /* |
156 | * Check to see if either our generic name or | |
157 | * specific name can satisfy the name requested | |
158 | * by the larval entry q. | |
159 | */ | |
6bfd4809 HX |
160 | if (strcmp(alg->cra_name, q->cra_name) && |
161 | strcmp(alg->cra_driver_name, q->cra_name)) | |
162 | continue; | |
163 | ||
164 | if (larval->adult) | |
165 | continue; | |
492e2b63 HX |
166 | if ((q->cra_flags ^ alg->cra_flags) & larval->mask) |
167 | continue; | |
2825982d HX |
168 | if (!crypto_mod_get(alg)) |
169 | continue; | |
6bfd4809 | 170 | |
2825982d | 171 | larval->adult = alg; |
fe3c5206 | 172 | complete_all(&larval->completion); |
6bfd4809 | 173 | continue; |
2825982d | 174 | } |
6bfd4809 HX |
175 | |
176 | if (strcmp(alg->cra_name, q->cra_name)) | |
177 | continue; | |
178 | ||
179 | if (strcmp(alg->cra_driver_name, q->cra_driver_name) && | |
180 | q->cra_priority > alg->cra_priority) | |
181 | continue; | |
182 | ||
a73e6996 | 183 | crypto_remove_spawns(&q->cra_users, list, alg->cra_flags); |
cce9e06d HX |
184 | } |
185 | ||
186 | list_add(&alg->cra_list, &crypto_alg_list); | |
2825982d HX |
187 | |
188 | crypto_notify(CRYPTO_MSG_ALG_REGISTER, alg); | |
4cc7720c | 189 | ret = 0; |
2825982d | 190 | |
cce9e06d | 191 | out: |
cce9e06d HX |
192 | return ret; |
193 | } | |
4cc7720c | 194 | |
6bfd4809 HX |
195 | static void crypto_remove_final(struct list_head *list) |
196 | { | |
197 | struct crypto_alg *alg; | |
198 | struct crypto_alg *n; | |
199 | ||
200 | list_for_each_entry_safe(alg, n, list, cra_list) { | |
201 | list_del_init(&alg->cra_list); | |
202 | crypto_alg_put(alg); | |
203 | } | |
204 | } | |
205 | ||
4cc7720c HX |
206 | int crypto_register_alg(struct crypto_alg *alg) |
207 | { | |
6bfd4809 | 208 | LIST_HEAD(list); |
4cc7720c HX |
209 | int err; |
210 | ||
211 | err = crypto_check_alg(alg); | |
212 | if (err) | |
213 | return err; | |
214 | ||
215 | down_write(&crypto_alg_sem); | |
6bfd4809 | 216 | err = __crypto_register_alg(alg, &list); |
4cc7720c HX |
217 | up_write(&crypto_alg_sem); |
218 | ||
6bfd4809 | 219 | crypto_remove_final(&list); |
4cc7720c HX |
220 | return err; |
221 | } | |
cce9e06d HX |
222 | EXPORT_SYMBOL_GPL(crypto_register_alg); |
223 | ||
6bfd4809 HX |
224 | static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list) |
225 | { | |
226 | if (unlikely(list_empty(&alg->cra_list))) | |
227 | return -ENOENT; | |
228 | ||
229 | alg->cra_flags |= CRYPTO_ALG_DEAD; | |
230 | ||
231 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg); | |
232 | list_del_init(&alg->cra_list); | |
a73e6996 | 233 | crypto_remove_spawns(&alg->cra_users, list, alg->cra_flags); |
6bfd4809 HX |
234 | |
235 | return 0; | |
236 | } | |
237 | ||
cce9e06d HX |
238 | int crypto_unregister_alg(struct crypto_alg *alg) |
239 | { | |
6bfd4809 HX |
240 | int ret; |
241 | LIST_HEAD(list); | |
cce9e06d HX |
242 | |
243 | down_write(&crypto_alg_sem); | |
6bfd4809 | 244 | ret = crypto_remove_alg(alg, &list); |
cce9e06d HX |
245 | up_write(&crypto_alg_sem); |
246 | ||
247 | if (ret) | |
248 | return ret; | |
249 | ||
250 | BUG_ON(atomic_read(&alg->cra_refcnt) != 1); | |
251 | if (alg->cra_destroy) | |
252 | alg->cra_destroy(alg); | |
253 | ||
6bfd4809 | 254 | crypto_remove_final(&list); |
cce9e06d HX |
255 | return 0; |
256 | } | |
257 | EXPORT_SYMBOL_GPL(crypto_unregister_alg); | |
258 | ||
4cc7720c HX |
259 | int crypto_register_template(struct crypto_template *tmpl) |
260 | { | |
261 | struct crypto_template *q; | |
262 | int err = -EEXIST; | |
263 | ||
264 | down_write(&crypto_alg_sem); | |
265 | ||
266 | list_for_each_entry(q, &crypto_template_list, list) { | |
267 | if (q == tmpl) | |
268 | goto out; | |
269 | } | |
270 | ||
271 | list_add(&tmpl->list, &crypto_template_list); | |
2825982d | 272 | crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl); |
4cc7720c HX |
273 | err = 0; |
274 | out: | |
275 | up_write(&crypto_alg_sem); | |
276 | return err; | |
277 | } | |
278 | EXPORT_SYMBOL_GPL(crypto_register_template); | |
279 | ||
280 | void crypto_unregister_template(struct crypto_template *tmpl) | |
281 | { | |
282 | struct crypto_instance *inst; | |
283 | struct hlist_node *p, *n; | |
284 | struct hlist_head *list; | |
6bfd4809 | 285 | LIST_HEAD(users); |
4cc7720c HX |
286 | |
287 | down_write(&crypto_alg_sem); | |
288 | ||
289 | BUG_ON(list_empty(&tmpl->list)); | |
290 | list_del_init(&tmpl->list); | |
291 | ||
292 | list = &tmpl->instances; | |
293 | hlist_for_each_entry(inst, p, list, list) { | |
6bfd4809 HX |
294 | int err = crypto_remove_alg(&inst->alg, &users); |
295 | BUG_ON(err); | |
4cc7720c HX |
296 | } |
297 | ||
2825982d HX |
298 | crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl); |
299 | ||
4cc7720c HX |
300 | up_write(&crypto_alg_sem); |
301 | ||
302 | hlist_for_each_entry_safe(inst, p, n, list, list) { | |
303 | BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1); | |
304 | tmpl->free(inst); | |
305 | } | |
6bfd4809 | 306 | crypto_remove_final(&users); |
4cc7720c HX |
307 | } |
308 | EXPORT_SYMBOL_GPL(crypto_unregister_template); | |
309 | ||
310 | static struct crypto_template *__crypto_lookup_template(const char *name) | |
311 | { | |
312 | struct crypto_template *q, *tmpl = NULL; | |
313 | ||
314 | down_read(&crypto_alg_sem); | |
315 | list_for_each_entry(q, &crypto_template_list, list) { | |
316 | if (strcmp(q->name, name)) | |
317 | continue; | |
318 | if (unlikely(!crypto_tmpl_get(q))) | |
319 | continue; | |
320 | ||
321 | tmpl = q; | |
322 | break; | |
323 | } | |
324 | up_read(&crypto_alg_sem); | |
325 | ||
326 | return tmpl; | |
327 | } | |
328 | ||
329 | struct crypto_template *crypto_lookup_template(const char *name) | |
330 | { | |
331 | return try_then_request_module(__crypto_lookup_template(name), name); | |
332 | } | |
333 | EXPORT_SYMBOL_GPL(crypto_lookup_template); | |
334 | ||
335 | int crypto_register_instance(struct crypto_template *tmpl, | |
336 | struct crypto_instance *inst) | |
337 | { | |
6bfd4809 | 338 | LIST_HEAD(list); |
4cc7720c HX |
339 | int err = -EINVAL; |
340 | ||
4cc7720c HX |
341 | err = crypto_check_alg(&inst->alg); |
342 | if (err) | |
343 | goto err; | |
344 | ||
345 | inst->alg.cra_module = tmpl->module; | |
346 | ||
347 | down_write(&crypto_alg_sem); | |
348 | ||
6bfd4809 | 349 | err = __crypto_register_alg(&inst->alg, &list); |
4cc7720c HX |
350 | if (err) |
351 | goto unlock; | |
352 | ||
353 | hlist_add_head(&inst->list, &tmpl->instances); | |
354 | inst->tmpl = tmpl; | |
355 | ||
356 | unlock: | |
357 | up_write(&crypto_alg_sem); | |
358 | ||
6bfd4809 HX |
359 | crypto_remove_final(&list); |
360 | ||
4cc7720c HX |
361 | err: |
362 | return err; | |
363 | } | |
364 | EXPORT_SYMBOL_GPL(crypto_register_instance); | |
365 | ||
6bfd4809 | 366 | int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, |
a73e6996 | 367 | struct crypto_instance *inst, u32 mask) |
6bfd4809 HX |
368 | { |
369 | int err = -EAGAIN; | |
370 | ||
371 | spawn->inst = inst; | |
a73e6996 | 372 | spawn->mask = mask; |
6bfd4809 HX |
373 | |
374 | down_write(&crypto_alg_sem); | |
375 | if (!crypto_is_moribund(alg)) { | |
376 | list_add(&spawn->list, &alg->cra_users); | |
377 | spawn->alg = alg; | |
378 | err = 0; | |
379 | } | |
380 | up_write(&crypto_alg_sem); | |
381 | ||
382 | return err; | |
383 | } | |
384 | EXPORT_SYMBOL_GPL(crypto_init_spawn); | |
385 | ||
386 | void crypto_drop_spawn(struct crypto_spawn *spawn) | |
387 | { | |
388 | down_write(&crypto_alg_sem); | |
389 | list_del(&spawn->list); | |
390 | up_write(&crypto_alg_sem); | |
391 | } | |
392 | EXPORT_SYMBOL_GPL(crypto_drop_spawn); | |
393 | ||
2e306ee0 HX |
394 | struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, |
395 | u32 mask) | |
6bfd4809 HX |
396 | { |
397 | struct crypto_alg *alg; | |
398 | struct crypto_alg *alg2; | |
399 | struct crypto_tfm *tfm; | |
400 | ||
401 | down_read(&crypto_alg_sem); | |
402 | alg = spawn->alg; | |
403 | alg2 = alg; | |
404 | if (alg2) | |
405 | alg2 = crypto_mod_get(alg2); | |
406 | up_read(&crypto_alg_sem); | |
407 | ||
408 | if (!alg2) { | |
409 | if (alg) | |
410 | crypto_shoot_alg(alg); | |
411 | return ERR_PTR(-EAGAIN); | |
412 | } | |
413 | ||
2e306ee0 HX |
414 | tfm = ERR_PTR(-EINVAL); |
415 | if (unlikely((alg->cra_flags ^ type) & mask)) | |
416 | goto out_put_alg; | |
417 | ||
27d2a330 | 418 | tfm = __crypto_alloc_tfm(alg, type, mask); |
6bfd4809 | 419 | if (IS_ERR(tfm)) |
2e306ee0 HX |
420 | goto out_put_alg; |
421 | ||
422 | return tfm; | |
6bfd4809 | 423 | |
2e306ee0 HX |
424 | out_put_alg: |
425 | crypto_mod_put(alg); | |
6bfd4809 HX |
426 | return tfm; |
427 | } | |
428 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm); | |
429 | ||
2825982d HX |
430 | int crypto_register_notifier(struct notifier_block *nb) |
431 | { | |
432 | return blocking_notifier_chain_register(&crypto_chain, nb); | |
433 | } | |
434 | EXPORT_SYMBOL_GPL(crypto_register_notifier); | |
435 | ||
436 | int crypto_unregister_notifier(struct notifier_block *nb) | |
437 | { | |
438 | return blocking_notifier_chain_unregister(&crypto_chain, nb); | |
439 | } | |
440 | EXPORT_SYMBOL_GPL(crypto_unregister_notifier); | |
441 | ||
ebc610e5 | 442 | struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb) |
7fed0bf2 | 443 | { |
39e1ee01 | 444 | struct rtattr *rta = tb[0]; |
ebc610e5 HX |
445 | struct crypto_attr_type *algt; |
446 | ||
447 | if (!rta) | |
448 | return ERR_PTR(-ENOENT); | |
449 | if (RTA_PAYLOAD(rta) < sizeof(*algt)) | |
450 | return ERR_PTR(-EINVAL); | |
39e1ee01 HX |
451 | if (rta->rta_type != CRYPTOA_TYPE) |
452 | return ERR_PTR(-EINVAL); | |
ebc610e5 HX |
453 | |
454 | algt = RTA_DATA(rta); | |
455 | ||
456 | return algt; | |
457 | } | |
458 | EXPORT_SYMBOL_GPL(crypto_get_attr_type); | |
459 | ||
460 | int crypto_check_attr_type(struct rtattr **tb, u32 type) | |
461 | { | |
462 | struct crypto_attr_type *algt; | |
463 | ||
464 | algt = crypto_get_attr_type(tb); | |
465 | if (IS_ERR(algt)) | |
466 | return PTR_ERR(algt); | |
467 | ||
468 | if ((algt->type ^ type) & algt->mask) | |
469 | return -EINVAL; | |
470 | ||
471 | return 0; | |
472 | } | |
473 | EXPORT_SYMBOL_GPL(crypto_check_attr_type); | |
474 | ||
3c09f17c | 475 | struct crypto_alg *crypto_attr_alg(struct rtattr *rta, u32 type, u32 mask) |
ebc610e5 | 476 | { |
7fed0bf2 HX |
477 | struct crypto_attr_alg *alga; |
478 | ||
ebc610e5 HX |
479 | if (!rta) |
480 | return ERR_PTR(-ENOENT); | |
481 | if (RTA_PAYLOAD(rta) < sizeof(*alga)) | |
7fed0bf2 | 482 | return ERR_PTR(-EINVAL); |
39e1ee01 HX |
483 | if (rta->rta_type != CRYPTOA_ALG) |
484 | return ERR_PTR(-EINVAL); | |
7fed0bf2 HX |
485 | |
486 | alga = RTA_DATA(rta); | |
487 | alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0; | |
488 | ||
489 | return crypto_alg_mod_lookup(alga->name, type, mask); | |
490 | } | |
3c09f17c HX |
491 | EXPORT_SYMBOL_GPL(crypto_attr_alg); |
492 | ||
493 | int crypto_attr_u32(struct rtattr *rta, u32 *num) | |
494 | { | |
495 | struct crypto_attr_u32 *nu32; | |
496 | ||
497 | if (!rta) | |
498 | return -ENOENT; | |
499 | if (RTA_PAYLOAD(rta) < sizeof(*nu32)) | |
500 | return -EINVAL; | |
501 | if (rta->rta_type != CRYPTOA_U32) | |
502 | return -EINVAL; | |
503 | ||
504 | nu32 = RTA_DATA(rta); | |
505 | *num = nu32->num; | |
506 | ||
507 | return 0; | |
508 | } | |
509 | EXPORT_SYMBOL_GPL(crypto_attr_u32); | |
7fed0bf2 HX |
510 | |
511 | struct crypto_instance *crypto_alloc_instance(const char *name, | |
512 | struct crypto_alg *alg) | |
513 | { | |
514 | struct crypto_instance *inst; | |
515 | struct crypto_spawn *spawn; | |
516 | int err; | |
517 | ||
518 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); | |
519 | if (!inst) | |
520 | return ERR_PTR(-ENOMEM); | |
521 | ||
522 | err = -ENAMETOOLONG; | |
523 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name, | |
524 | alg->cra_name) >= CRYPTO_MAX_ALG_NAME) | |
525 | goto err_free_inst; | |
526 | ||
527 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", | |
528 | name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) | |
529 | goto err_free_inst; | |
530 | ||
531 | spawn = crypto_instance_ctx(inst); | |
a73e6996 HX |
532 | err = crypto_init_spawn(spawn, alg, inst, |
533 | CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); | |
7fed0bf2 HX |
534 | |
535 | if (err) | |
536 | goto err_free_inst; | |
537 | ||
538 | return inst; | |
539 | ||
540 | err_free_inst: | |
541 | kfree(inst); | |
542 | return ERR_PTR(err); | |
543 | } | |
544 | EXPORT_SYMBOL_GPL(crypto_alloc_instance); | |
545 | ||
b5b7f088 HX |
546 | void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen) |
547 | { | |
548 | INIT_LIST_HEAD(&queue->list); | |
549 | queue->backlog = &queue->list; | |
550 | queue->qlen = 0; | |
551 | queue->max_qlen = max_qlen; | |
552 | } | |
553 | EXPORT_SYMBOL_GPL(crypto_init_queue); | |
554 | ||
555 | int crypto_enqueue_request(struct crypto_queue *queue, | |
556 | struct crypto_async_request *request) | |
557 | { | |
558 | int err = -EINPROGRESS; | |
559 | ||
560 | if (unlikely(queue->qlen >= queue->max_qlen)) { | |
561 | err = -EBUSY; | |
562 | if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) | |
563 | goto out; | |
564 | if (queue->backlog == &queue->list) | |
565 | queue->backlog = &request->list; | |
566 | } | |
567 | ||
568 | queue->qlen++; | |
569 | list_add_tail(&request->list, &queue->list); | |
570 | ||
571 | out: | |
572 | return err; | |
573 | } | |
574 | EXPORT_SYMBOL_GPL(crypto_enqueue_request); | |
575 | ||
576 | struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) | |
577 | { | |
578 | struct list_head *request; | |
579 | ||
580 | if (unlikely(!queue->qlen)) | |
581 | return NULL; | |
582 | ||
583 | queue->qlen--; | |
584 | ||
585 | if (queue->backlog != &queue->list) | |
586 | queue->backlog = queue->backlog->next; | |
587 | ||
588 | request = queue->list.next; | |
589 | list_del(request); | |
590 | ||
591 | return list_entry(request, struct crypto_async_request, list); | |
592 | } | |
593 | EXPORT_SYMBOL_GPL(crypto_dequeue_request); | |
594 | ||
595 | int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm) | |
596 | { | |
597 | struct crypto_async_request *req; | |
598 | ||
599 | list_for_each_entry(req, &queue->list, list) { | |
600 | if (req->tfm == tfm) | |
601 | return 1; | |
602 | } | |
603 | ||
604 | return 0; | |
605 | } | |
606 | EXPORT_SYMBOL_GPL(crypto_tfm_in_queue); | |
607 | ||
cce9e06d HX |
608 | static int __init crypto_algapi_init(void) |
609 | { | |
610 | crypto_init_proc(); | |
611 | return 0; | |
612 | } | |
613 | ||
614 | static void __exit crypto_algapi_exit(void) | |
615 | { | |
616 | crypto_exit_proc(); | |
617 | } | |
618 | ||
619 | module_init(crypto_algapi_init); | |
620 | module_exit(crypto_algapi_exit); | |
621 | ||
622 | MODULE_LICENSE("GPL"); | |
623 | MODULE_DESCRIPTION("Cryptographic algorithms API"); |