blob: f137a432061f4224ccbff0bef41c58d95c859921 [file] [log] [blame]
Herbert Xucce9e062006-08-21 21:08:13 +10001/*
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
Herbert Xu6bfd4802006-09-21 11:39:29 +100013#include <linux/err.h>
Herbert Xucce9e062006-08-21 21:08:13 +100014#include <linux/errno.h>
15#include <linux/init.h>
16#include <linux/kernel.h>
Herbert Xu4cc77202006-08-06 21:16:34 +100017#include <linux/list.h>
Herbert Xucce9e062006-08-21 21:08:13 +100018#include <linux/module.h>
Herbert Xu7fed0bf2006-08-06 23:10:45 +100019#include <linux/rtnetlink.h>
Herbert Xucce9e062006-08-21 21:08:13 +100020#include <linux/string.h>
21
22#include "internal.h"
23
Herbert Xu4cc77202006-08-06 21:16:34 +100024static LIST_HEAD(crypto_template_list);
25
Herbert Xu492e2b62006-09-21 11:35:17 +100026void crypto_larval_error(const char *name, u32 type, u32 mask)
Herbert Xu28259822006-08-06 21:23:26 +100027{
28 struct crypto_alg *alg;
29
30 down_read(&crypto_alg_sem);
Herbert Xu492e2b62006-09-21 11:35:17 +100031 alg = __crypto_alg_lookup(name, type, mask);
Herbert Xu28259822006-08-06 21:23:26 +100032 up_read(&crypto_alg_sem);
33
34 if (alg) {
35 if (crypto_is_larval(alg)) {
36 struct crypto_larval *larval = (void *)alg;
37 complete(&larval->completion);
38 }
39 crypto_mod_put(alg);
40 }
41}
42EXPORT_SYMBOL_GPL(crypto_larval_error);
43
Herbert Xucce9e062006-08-21 21:08:13 +100044static 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
Herbert Xu4cc77202006-08-06 21:16:34 +100061static int crypto_check_alg(struct crypto_alg *alg)
Herbert Xucce9e062006-08-21 21:08:13 +100062{
Herbert Xucce9e062006-08-21 21:08:13 +100063 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;
Herbert Xucce9e062006-08-21 21:08:13 +100074
Herbert Xu4cc77202006-08-06 21:16:34 +100075 return crypto_set_driver_name(alg);
76}
77
Herbert Xu6bfd4802006-09-21 11:39:29 +100078static 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
Herbert Xua73e6992007-04-08 21:31:36 +100087static void crypto_remove_spawn(struct crypto_spawn *spawn,
88 struct list_head *list,
89 struct list_head *secondary_spawns)
90{
91 struct crypto_instance *inst = spawn->inst;
92 struct crypto_template *tmpl = inst->tmpl;
93
94 list_del_init(&spawn->list);
95 spawn->alg = NULL;
96
97 if (crypto_is_dead(&inst->alg))
98 return;
99
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
Herbert Xu6bfd4802006-09-21 11:39:29 +1000112static void crypto_remove_spawns(struct list_head *spawns,
Herbert Xua73e6992007-04-08 21:31:36 +1000113 struct list_head *list, u32 new_type)
Herbert Xu6bfd4802006-09-21 11:39:29 +1000114{
115 struct crypto_spawn *spawn, *n;
Herbert Xua73e6992007-04-08 21:31:36 +1000116 LIST_HEAD(secondary_spawns);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000117
118 list_for_each_entry_safe(spawn, n, spawns, list) {
Herbert Xua73e6992007-04-08 21:31:36 +1000119 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
Herbert Xu6bfd4802006-09-21 11:39:29 +1000120 continue;
121
Herbert Xua73e6992007-04-08 21:31:36 +1000122 crypto_remove_spawn(spawn, list, &secondary_spawns);
123 }
Herbert Xu6bfd4802006-09-21 11:39:29 +1000124
Herbert Xua73e6992007-04-08 21:31:36 +1000125 while (!list_empty(&secondary_spawns)) {
126 list_for_each_entry_safe(spawn, n, &secondary_spawns, list)
127 crypto_remove_spawn(spawn, list, &secondary_spawns);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000128 }
129}
130
131static int __crypto_register_alg(struct crypto_alg *alg,
132 struct list_head *list)
Herbert Xu4cc77202006-08-06 21:16:34 +1000133{
134 struct crypto_alg *q;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000135 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;
Herbert Xu4cc77202006-08-06 21:16:34 +1000143
Herbert Xu28259822006-08-06 21:23:26 +1000144 atomic_set(&alg->cra_refcnt, 1);
Herbert Xucce9e062006-08-21 21:08:13 +1000145 list_for_each_entry(q, &crypto_alg_list, cra_list) {
Herbert Xu4cc77202006-08-06 21:16:34 +1000146 if (q == alg)
Herbert Xucce9e062006-08-21 21:08:13 +1000147 goto out;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000148
149 if (crypto_is_moribund(q))
150 continue;
151
152 if (crypto_is_larval(q)) {
Herbert Xu28259822006-08-06 21:23:26 +1000153 struct crypto_larval *larval = (void *)q;
154
Herbert Xu6bfd4802006-09-21 11:39:29 +1000155 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;
Herbert Xu492e2b62006-09-21 11:35:17 +1000161 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
162 continue;
Herbert Xu28259822006-08-06 21:23:26 +1000163 if (!crypto_mod_get(alg))
164 continue;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000165
Herbert Xu28259822006-08-06 21:23:26 +1000166 larval->adult = alg;
167 complete(&larval->completion);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000168 continue;
Herbert Xu28259822006-08-06 21:23:26 +1000169 }
Herbert Xu6bfd4802006-09-21 11:39:29 +1000170
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
Herbert Xua73e6992007-04-08 21:31:36 +1000178 crypto_remove_spawns(&q->cra_users, list, alg->cra_flags);
Herbert Xucce9e062006-08-21 21:08:13 +1000179 }
180
181 list_add(&alg->cra_list, &crypto_alg_list);
Herbert Xu28259822006-08-06 21:23:26 +1000182
183 crypto_notify(CRYPTO_MSG_ALG_REGISTER, alg);
Herbert Xu4cc77202006-08-06 21:16:34 +1000184 ret = 0;
Herbert Xu28259822006-08-06 21:23:26 +1000185
Herbert Xucce9e062006-08-21 21:08:13 +1000186out:
Herbert Xucce9e062006-08-21 21:08:13 +1000187 return ret;
188}
Herbert Xu4cc77202006-08-06 21:16:34 +1000189
Herbert Xu6bfd4802006-09-21 11:39:29 +1000190static 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
Herbert Xu4cc77202006-08-06 21:16:34 +1000201int crypto_register_alg(struct crypto_alg *alg)
202{
Herbert Xu6bfd4802006-09-21 11:39:29 +1000203 LIST_HEAD(list);
Herbert Xu4cc77202006-08-06 21:16:34 +1000204 int err;
205
206 err = crypto_check_alg(alg);
207 if (err)
208 return err;
209
210 down_write(&crypto_alg_sem);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000211 err = __crypto_register_alg(alg, &list);
Herbert Xu4cc77202006-08-06 21:16:34 +1000212 up_write(&crypto_alg_sem);
213
Herbert Xu6bfd4802006-09-21 11:39:29 +1000214 crypto_remove_final(&list);
Herbert Xu4cc77202006-08-06 21:16:34 +1000215 return err;
216}
Herbert Xucce9e062006-08-21 21:08:13 +1000217EXPORT_SYMBOL_GPL(crypto_register_alg);
218
Herbert Xu6bfd4802006-09-21 11:39:29 +1000219static 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);
Herbert Xua73e6992007-04-08 21:31:36 +1000228 crypto_remove_spawns(&alg->cra_users, list, alg->cra_flags);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000229
230 return 0;
231}
232
Herbert Xucce9e062006-08-21 21:08:13 +1000233int crypto_unregister_alg(struct crypto_alg *alg)
234{
Herbert Xu6bfd4802006-09-21 11:39:29 +1000235 int ret;
236 LIST_HEAD(list);
Herbert Xucce9e062006-08-21 21:08:13 +1000237
238 down_write(&crypto_alg_sem);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000239 ret = crypto_remove_alg(alg, &list);
Herbert Xucce9e062006-08-21 21:08:13 +1000240 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
Herbert Xu6bfd4802006-09-21 11:39:29 +1000249 crypto_remove_final(&list);
Herbert Xucce9e062006-08-21 21:08:13 +1000250 return 0;
251}
252EXPORT_SYMBOL_GPL(crypto_unregister_alg);
253
Herbert Xu4cc77202006-08-06 21:16:34 +1000254int 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);
Herbert Xu28259822006-08-06 21:23:26 +1000267 crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
Herbert Xu4cc77202006-08-06 21:16:34 +1000268 err = 0;
269out:
270 up_write(&crypto_alg_sem);
271 return err;
272}
273EXPORT_SYMBOL_GPL(crypto_register_template);
274
275void crypto_unregister_template(struct crypto_template *tmpl)
276{
277 struct crypto_instance *inst;
278 struct hlist_node *p, *n;
279 struct hlist_head *list;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000280 LIST_HEAD(users);
Herbert Xu4cc77202006-08-06 21:16:34 +1000281
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) {
Herbert Xu6bfd4802006-09-21 11:39:29 +1000289 int err = crypto_remove_alg(&inst->alg, &users);
290 BUG_ON(err);
Herbert Xu4cc77202006-08-06 21:16:34 +1000291 }
292
Herbert Xu28259822006-08-06 21:23:26 +1000293 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
294
Herbert Xu4cc77202006-08-06 21:16:34 +1000295 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 }
Herbert Xu6bfd4802006-09-21 11:39:29 +1000301 crypto_remove_final(&users);
Herbert Xu4cc77202006-08-06 21:16:34 +1000302}
303EXPORT_SYMBOL_GPL(crypto_unregister_template);
304
305static 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
324struct crypto_template *crypto_lookup_template(const char *name)
325{
326 return try_then_request_module(__crypto_lookup_template(name), name);
327}
328EXPORT_SYMBOL_GPL(crypto_lookup_template);
329
330int crypto_register_instance(struct crypto_template *tmpl,
331 struct crypto_instance *inst)
332{
Herbert Xu6bfd4802006-09-21 11:39:29 +1000333 LIST_HEAD(list);
Herbert Xu4cc77202006-08-06 21:16:34 +1000334 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
Herbert Xu6bfd4802006-09-21 11:39:29 +1000347 err = __crypto_register_alg(&inst->alg, &list);
Herbert Xu4cc77202006-08-06 21:16:34 +1000348 if (err)
349 goto unlock;
350
351 hlist_add_head(&inst->list, &tmpl->instances);
352 inst->tmpl = tmpl;
353
354unlock:
355 up_write(&crypto_alg_sem);
356
Herbert Xu6bfd4802006-09-21 11:39:29 +1000357 crypto_remove_final(&list);
358
Herbert Xu4cc77202006-08-06 21:16:34 +1000359err:
360 return err;
361}
362EXPORT_SYMBOL_GPL(crypto_register_instance);
363
Herbert Xu6bfd4802006-09-21 11:39:29 +1000364int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
Herbert Xua73e6992007-04-08 21:31:36 +1000365 struct crypto_instance *inst, u32 mask)
Herbert Xu6bfd4802006-09-21 11:39:29 +1000366{
367 int err = -EAGAIN;
368
369 spawn->inst = inst;
Herbert Xua73e6992007-04-08 21:31:36 +1000370 spawn->mask = mask;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000371
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}
382EXPORT_SYMBOL_GPL(crypto_init_spawn);
383
384void 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}
390EXPORT_SYMBOL_GPL(crypto_drop_spawn);
391
Herbert Xu2e306ee2006-12-17 10:05:58 +1100392struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
393 u32 mask)
Herbert Xu6bfd4802006-09-21 11:39:29 +1000394{
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
Herbert Xu2e306ee2006-12-17 10:05:58 +1100412 tfm = ERR_PTR(-EINVAL);
413 if (unlikely((alg->cra_flags ^ type) & mask))
414 goto out_put_alg;
415
Herbert Xu27d2a332007-01-24 20:50:26 +1100416 tfm = __crypto_alloc_tfm(alg, type, mask);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000417 if (IS_ERR(tfm))
Herbert Xu2e306ee2006-12-17 10:05:58 +1100418 goto out_put_alg;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000419
420 return tfm;
Herbert Xu2e306ee2006-12-17 10:05:58 +1100421
422out_put_alg:
423 crypto_mod_put(alg);
424 return tfm;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000425}
426EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
427
Herbert Xu28259822006-08-06 21:23:26 +1000428int crypto_register_notifier(struct notifier_block *nb)
429{
430 return blocking_notifier_chain_register(&crypto_chain, nb);
431}
432EXPORT_SYMBOL_GPL(crypto_register_notifier);
433
434int crypto_unregister_notifier(struct notifier_block *nb)
435{
436 return blocking_notifier_chain_unregister(&crypto_chain, nb);
437}
438EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
439
Herbert Xuebc610e2007-01-01 18:37:02 +1100440struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000441{
Herbert Xuebc610e2007-01-01 18:37:02 +1100442 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}
454EXPORT_SYMBOL_GPL(crypto_get_attr_type);
455
456int 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}
469EXPORT_SYMBOL_GPL(crypto_check_attr_type);
470
471struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb, u32 type, u32 mask)
472{
473 struct rtattr *rta = tb[CRYPTOA_ALG - 1];
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000474 struct crypto_attr_alg *alga;
475
Herbert Xuebc610e2007-01-01 18:37:02 +1100476 if (!rta)
477 return ERR_PTR(-ENOENT);
478 if (RTA_PAYLOAD(rta) < sizeof(*alga))
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000479 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}
486EXPORT_SYMBOL_GPL(crypto_get_attr_alg);
487
488struct 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);
Herbert Xua73e6992007-04-08 21:31:36 +1000509 err = crypto_init_spawn(spawn, alg, inst,
510 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000511
512 if (err)
513 goto err_free_inst;
514
515 return inst;
516
517err_free_inst:
518 kfree(inst);
519 return ERR_PTR(err);
520}
521EXPORT_SYMBOL_GPL(crypto_alloc_instance);
522
Herbert Xub5b7f082007-04-16 20:48:54 +1000523void 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}
530EXPORT_SYMBOL_GPL(crypto_init_queue);
531
532int 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
548out:
549 return err;
550}
551EXPORT_SYMBOL_GPL(crypto_enqueue_request);
552
553struct 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}
570EXPORT_SYMBOL_GPL(crypto_dequeue_request);
571
572int 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}
583EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
584
Herbert Xucce9e062006-08-21 21:08:13 +1000585static int __init crypto_algapi_init(void)
586{
587 crypto_init_proc();
588 return 0;
589}
590
591static void __exit crypto_algapi_exit(void)
592{
593 crypto_exit_proc();
594}
595
596module_init(crypto_algapi_init);
597module_exit(crypto_algapi_exit);
598
599MODULE_LICENSE("GPL");
600MODULE_DESCRIPTION("Cryptographic algorithms API");