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
13#include <linux/err.h>
14#include <linux/errno.h>
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <linux/list.h>
18#include <linux/module.h>
19#include <linux/rtnetlink.h>
20#include <linux/slab.h>
21#include <linux/string.h>
22
23#include "internal.h"
24
25static void crypto_remove_final(struct list_head *list);
26
27static LIST_HEAD(crypto_template_list);
28
29void crypto_larval_error(const char *name, u32 type, u32 mask)
30{
31	struct crypto_alg *alg;
32
33	alg = crypto_alg_lookup(name, type, mask);
34
35	if (alg) {
36		if (crypto_is_larval(alg)) {
37			struct crypto_larval *larval = (void *)alg;
38			complete_all(&larval->completion);
39		}
40		crypto_mod_put(alg);
41	}
42}
43EXPORT_SYMBOL_GPL(crypto_larval_error);
44
45static inline int crypto_set_driver_name(struct crypto_alg *alg)
46{
47	static const char suffix[] = "-generic";
48	char *driver_name = alg->cra_driver_name;
49	int len;
50
51	if (*driver_name)
52		return 0;
53
54	len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
55	if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
56		return -ENAMETOOLONG;
57
58	memcpy(driver_name + len, suffix, sizeof(suffix));
59	return 0;
60}
61
62static int crypto_check_alg(struct crypto_alg *alg)
63{
64	if (alg->cra_alignmask & (alg->cra_alignmask + 1))
65		return -EINVAL;
66
67	if (alg->cra_blocksize > PAGE_SIZE / 8)
68		return -EINVAL;
69
70	if (alg->cra_priority < 0)
71		return -EINVAL;
72
73	return crypto_set_driver_name(alg);
74}
75
76static void crypto_destroy_instance(struct crypto_alg *alg)
77{
78	struct crypto_instance *inst = (void *)alg;
79	struct crypto_template *tmpl = inst->tmpl;
80
81	tmpl->free(inst);
82	crypto_tmpl_put(tmpl);
83}
84
85static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
86					    struct list_head *stack,
87					    struct list_head *top,
88					    struct list_head *secondary_spawns)
89{
90	struct crypto_spawn *spawn, *n;
91
92	if (list_empty(stack))
93		return NULL;
94
95	spawn = list_first_entry(stack, struct crypto_spawn, list);
96	n = list_entry(spawn->list.next, struct crypto_spawn, list);
97
98	if (spawn->alg && &n->list != stack && !n->alg)
99		n->alg = (n->list.next == stack) ? alg :
100			 &list_entry(n->list.next, struct crypto_spawn,
101				     list)->inst->alg;
102
103	list_move(&spawn->list, secondary_spawns);
104
105	return &n->list == stack ? top : &n->inst->alg.cra_users;
106}
107
108static void crypto_remove_spawn(struct crypto_spawn *spawn,
109				struct list_head *list)
110{
111	struct crypto_instance *inst = spawn->inst;
112	struct crypto_template *tmpl = inst->tmpl;
113
114	if (crypto_is_dead(&inst->alg))
115		return;
116
117	inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
118	if (hlist_unhashed(&inst->list))
119		return;
120
121	if (!tmpl || !crypto_tmpl_get(tmpl))
122		return;
123
124	crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
125	list_move(&inst->alg.cra_list, list);
126	hlist_del(&inst->list);
127	inst->alg.cra_destroy = crypto_destroy_instance;
128
129	BUG_ON(!list_empty(&inst->alg.cra_users));
130}
131
132static void crypto_remove_spawns(struct crypto_alg *alg,
133				 struct list_head *list,
134				 struct crypto_alg *nalg)
135{
136	u32 new_type = (nalg ?: alg)->cra_flags;
137	struct crypto_spawn *spawn, *n;
138	LIST_HEAD(secondary_spawns);
139	struct list_head *spawns;
140	LIST_HEAD(stack);
141	LIST_HEAD(top);
142
143	spawns = &alg->cra_users;
144	list_for_each_entry_safe(spawn, n, spawns, list) {
145		if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
146			continue;
147
148		list_move(&spawn->list, &top);
149	}
150
151	spawns = &top;
152	do {
153		while (!list_empty(spawns)) {
154			struct crypto_instance *inst;
155
156			spawn = list_first_entry(spawns, struct crypto_spawn,
157						 list);
158			inst = spawn->inst;
159
160			BUG_ON(&inst->alg == alg);
161
162			list_move(&spawn->list, &stack);
163
164			if (&inst->alg == nalg)
165				break;
166
167			spawn->alg = NULL;
168			spawns = &inst->alg.cra_users;
169		}
170	} while ((spawns = crypto_more_spawns(alg, &stack, &top,
171					      &secondary_spawns)));
172
173	list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
174		if (spawn->alg)
175			list_move(&spawn->list, &spawn->alg->cra_users);
176		else
177			crypto_remove_spawn(spawn, list);
178	}
179}
180
181static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
182{
183	struct crypto_alg *q;
184	struct crypto_larval *larval;
185	int ret = -EAGAIN;
186
187	if (crypto_is_dead(alg))
188		goto err;
189
190	INIT_LIST_HEAD(&alg->cra_users);
191
192	/* No cheating! */
193	alg->cra_flags &= ~CRYPTO_ALG_TESTED;
194
195	ret = -EEXIST;
196
197	atomic_set(&alg->cra_refcnt, 1);
198	list_for_each_entry(q, &crypto_alg_list, cra_list) {
199		if (q == alg)
200			goto err;
201
202		if (crypto_is_moribund(q))
203			continue;
204
205		if (crypto_is_larval(q)) {
206			if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
207				goto err;
208			continue;
209		}
210
211		if (!strcmp(q->cra_driver_name, alg->cra_name) ||
212		    !strcmp(q->cra_name, alg->cra_driver_name))
213			goto err;
214	}
215
216	larval = crypto_larval_alloc(alg->cra_name,
217				     alg->cra_flags | CRYPTO_ALG_TESTED, 0);
218	if (IS_ERR(larval))
219		goto out;
220
221	ret = -ENOENT;
222	larval->adult = crypto_mod_get(alg);
223	if (!larval->adult)
224		goto free_larval;
225
226	atomic_set(&larval->alg.cra_refcnt, 1);
227	memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
228	       CRYPTO_MAX_ALG_NAME);
229	larval->alg.cra_priority = alg->cra_priority;
230
231	list_add(&alg->cra_list, &crypto_alg_list);
232	list_add(&larval->alg.cra_list, &crypto_alg_list);
233
234out:
235	return larval;
236
237free_larval:
238	kfree(larval);
239err:
240	larval = ERR_PTR(ret);
241	goto out;
242}
243
244void crypto_alg_tested(const char *name, int err)
245{
246	struct crypto_larval *test;
247	struct crypto_alg *alg;
248	struct crypto_alg *q;
249	LIST_HEAD(list);
250
251	down_write(&crypto_alg_sem);
252	list_for_each_entry(q, &crypto_alg_list, cra_list) {
253		if (crypto_is_moribund(q) || !crypto_is_larval(q))
254			continue;
255
256		test = (struct crypto_larval *)q;
257
258		if (!strcmp(q->cra_driver_name, name))
259			goto found;
260	}
261
262	printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
263	goto unlock;
264
265found:
266	q->cra_flags |= CRYPTO_ALG_DEAD;
267	alg = test->adult;
268	if (err || list_empty(&alg->cra_list))
269		goto complete;
270
271	alg->cra_flags |= CRYPTO_ALG_TESTED;
272
273	list_for_each_entry(q, &crypto_alg_list, cra_list) {
274		if (q == alg)
275			continue;
276
277		if (crypto_is_moribund(q))
278			continue;
279
280		if (crypto_is_larval(q)) {
281			struct crypto_larval *larval = (void *)q;
282
283			/*
284			 * Check to see if either our generic name or
285			 * specific name can satisfy the name requested
286			 * by the larval entry q.
287			 */
288			if (strcmp(alg->cra_name, q->cra_name) &&
289			    strcmp(alg->cra_driver_name, q->cra_name))
290				continue;
291
292			if (larval->adult)
293				continue;
294			if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
295				continue;
296			if (!crypto_mod_get(alg))
297				continue;
298
299			larval->adult = alg;
300			complete_all(&larval->completion);
301			continue;
302		}
303
304		if (strcmp(alg->cra_name, q->cra_name))
305			continue;
306
307		if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
308		    q->cra_priority > alg->cra_priority)
309			continue;
310
311		crypto_remove_spawns(q, &list, alg);
312	}
313
314complete:
315	complete_all(&test->completion);
316
317unlock:
318	up_write(&crypto_alg_sem);
319
320	crypto_remove_final(&list);
321}
322EXPORT_SYMBOL_GPL(crypto_alg_tested);
323
324static void crypto_remove_final(struct list_head *list)
325{
326	struct crypto_alg *alg;
327	struct crypto_alg *n;
328
329	list_for_each_entry_safe(alg, n, list, cra_list) {
330		list_del_init(&alg->cra_list);
331		crypto_alg_put(alg);
332	}
333}
334
335static void crypto_wait_for_test(struct crypto_larval *larval)
336{
337	int err;
338
339	err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
340	if (err != NOTIFY_STOP) {
341		if (WARN_ON(err != NOTIFY_DONE))
342			goto out;
343		crypto_alg_tested(larval->alg.cra_driver_name, 0);
344	}
345
346	err = wait_for_completion_interruptible(&larval->completion);
347	WARN_ON(err);
348
349out:
350	crypto_larval_kill(&larval->alg);
351}
352
353int crypto_register_alg(struct crypto_alg *alg)
354{
355	struct crypto_larval *larval;
356	int err;
357
358	err = crypto_check_alg(alg);
359	if (err)
360		return err;
361
362	down_write(&crypto_alg_sem);
363	larval = __crypto_register_alg(alg);
364	up_write(&crypto_alg_sem);
365
366	if (IS_ERR(larval))
367		return PTR_ERR(larval);
368
369	crypto_wait_for_test(larval);
370	return 0;
371}
372EXPORT_SYMBOL_GPL(crypto_register_alg);
373
374static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
375{
376	if (unlikely(list_empty(&alg->cra_list)))
377		return -ENOENT;
378
379	alg->cra_flags |= CRYPTO_ALG_DEAD;
380
381	crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
382	list_del_init(&alg->cra_list);
383	crypto_remove_spawns(alg, list, NULL);
384
385	return 0;
386}
387
388int crypto_unregister_alg(struct crypto_alg *alg)
389{
390	int ret;
391	LIST_HEAD(list);
392
393	down_write(&crypto_alg_sem);
394	ret = crypto_remove_alg(alg, &list);
395	up_write(&crypto_alg_sem);
396
397	if (ret)
398		return ret;
399
400	BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
401	if (alg->cra_destroy)
402		alg->cra_destroy(alg);
403
404	crypto_remove_final(&list);
405	return 0;
406}
407EXPORT_SYMBOL_GPL(crypto_unregister_alg);
408
409int crypto_register_template(struct crypto_template *tmpl)
410{
411	struct crypto_template *q;
412	int err = -EEXIST;
413
414	down_write(&crypto_alg_sem);
415
416	list_for_each_entry(q, &crypto_template_list, list) {
417		if (q == tmpl)
418			goto out;
419	}
420
421	list_add(&tmpl->list, &crypto_template_list);
422	crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
423	err = 0;
424out:
425	up_write(&crypto_alg_sem);
426	return err;
427}
428EXPORT_SYMBOL_GPL(crypto_register_template);
429
430void crypto_unregister_template(struct crypto_template *tmpl)
431{
432	struct crypto_instance *inst;
433	struct hlist_node *p, *n;
434	struct hlist_head *list;
435	LIST_HEAD(users);
436
437	down_write(&crypto_alg_sem);
438
439	BUG_ON(list_empty(&tmpl->list));
440	list_del_init(&tmpl->list);
441
442	list = &tmpl->instances;
443	hlist_for_each_entry(inst, p, list, list) {
444		int err = crypto_remove_alg(&inst->alg, &users);
445		BUG_ON(err);
446	}
447
448	crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
449
450	up_write(&crypto_alg_sem);
451
452	hlist_for_each_entry_safe(inst, p, n, list, list) {
453		BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
454		tmpl->free(inst);
455	}
456	crypto_remove_final(&users);
457}
458EXPORT_SYMBOL_GPL(crypto_unregister_template);
459
460static struct crypto_template *__crypto_lookup_template(const char *name)
461{
462	struct crypto_template *q, *tmpl = NULL;
463
464	down_read(&crypto_alg_sem);
465	list_for_each_entry(q, &crypto_template_list, list) {
466		if (strcmp(q->name, name))
467			continue;
468		if (unlikely(!crypto_tmpl_get(q)))
469			continue;
470
471		tmpl = q;
472		break;
473	}
474	up_read(&crypto_alg_sem);
475
476	return tmpl;
477}
478
479struct crypto_template *crypto_lookup_template(const char *name)
480{
481	return try_then_request_module(__crypto_lookup_template(name), name);
482}
483EXPORT_SYMBOL_GPL(crypto_lookup_template);
484
485int crypto_register_instance(struct crypto_template *tmpl,
486			     struct crypto_instance *inst)
487{
488	struct crypto_larval *larval;
489	int err;
490
491	err = crypto_check_alg(&inst->alg);
492	if (err)
493		goto err;
494
495	inst->alg.cra_module = tmpl->module;
496
497	down_write(&crypto_alg_sem);
498
499	larval = __crypto_register_alg(&inst->alg);
500	if (IS_ERR(larval))
501		goto unlock;
502
503	hlist_add_head(&inst->list, &tmpl->instances);
504	inst->tmpl = tmpl;
505
506unlock:
507	up_write(&crypto_alg_sem);
508
509	err = PTR_ERR(larval);
510	if (IS_ERR(larval))
511		goto err;
512
513	crypto_wait_for_test(larval);
514	err = 0;
515
516err:
517	return err;
518}
519EXPORT_SYMBOL_GPL(crypto_register_instance);
520
521int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
522		      struct crypto_instance *inst, u32 mask)
523{
524	int err = -EAGAIN;
525
526	spawn->inst = inst;
527	spawn->mask = mask;
528
529	down_write(&crypto_alg_sem);
530	if (!crypto_is_moribund(alg)) {
531		list_add(&spawn->list, &alg->cra_users);
532		spawn->alg = alg;
533		err = 0;
534	}
535	up_write(&crypto_alg_sem);
536
537	return err;
538}
539EXPORT_SYMBOL_GPL(crypto_init_spawn);
540
541int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
542		       struct crypto_instance *inst,
543		       const struct crypto_type *frontend)
544{
545	int err = -EINVAL;
546
547	if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
548		goto out;
549
550	spawn->frontend = frontend;
551	err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
552
553out:
554	return err;
555}
556EXPORT_SYMBOL_GPL(crypto_init_spawn2);
557
558void crypto_drop_spawn(struct crypto_spawn *spawn)
559{
560	if (!spawn->alg)
561		return;
562
563	down_write(&crypto_alg_sem);
564	list_del(&spawn->list);
565	up_write(&crypto_alg_sem);
566}
567EXPORT_SYMBOL_GPL(crypto_drop_spawn);
568
569static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
570{
571	struct crypto_alg *alg;
572	struct crypto_alg *alg2;
573
574	down_read(&crypto_alg_sem);
575	alg = spawn->alg;
576	alg2 = alg;
577	if (alg2)
578		alg2 = crypto_mod_get(alg2);
579	up_read(&crypto_alg_sem);
580
581	if (!alg2) {
582		if (alg)
583			crypto_shoot_alg(alg);
584		return ERR_PTR(-EAGAIN);
585	}
586
587	return alg;
588}
589
590struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
591				    u32 mask)
592{
593	struct crypto_alg *alg;
594	struct crypto_tfm *tfm;
595
596	alg = crypto_spawn_alg(spawn);
597	if (IS_ERR(alg))
598		return ERR_CAST(alg);
599
600	tfm = ERR_PTR(-EINVAL);
601	if (unlikely((alg->cra_flags ^ type) & mask))
602		goto out_put_alg;
603
604	tfm = __crypto_alloc_tfm(alg, type, mask);
605	if (IS_ERR(tfm))
606		goto out_put_alg;
607
608	return tfm;
609
610out_put_alg:
611	crypto_mod_put(alg);
612	return tfm;
613}
614EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
615
616void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
617{
618	struct crypto_alg *alg;
619	struct crypto_tfm *tfm;
620
621	alg = crypto_spawn_alg(spawn);
622	if (IS_ERR(alg))
623		return ERR_CAST(alg);
624
625	tfm = crypto_create_tfm(alg, spawn->frontend);
626	if (IS_ERR(tfm))
627		goto out_put_alg;
628
629	return tfm;
630
631out_put_alg:
632	crypto_mod_put(alg);
633	return tfm;
634}
635EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
636
637int crypto_register_notifier(struct notifier_block *nb)
638{
639	return blocking_notifier_chain_register(&crypto_chain, nb);
640}
641EXPORT_SYMBOL_GPL(crypto_register_notifier);
642
643int crypto_unregister_notifier(struct notifier_block *nb)
644{
645	return blocking_notifier_chain_unregister(&crypto_chain, nb);
646}
647EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
648
649struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
650{
651	struct rtattr *rta = tb[0];
652	struct crypto_attr_type *algt;
653
654	if (!rta)
655		return ERR_PTR(-ENOENT);
656	if (RTA_PAYLOAD(rta) < sizeof(*algt))
657		return ERR_PTR(-EINVAL);
658	if (rta->rta_type != CRYPTOA_TYPE)
659		return ERR_PTR(-EINVAL);
660
661	algt = RTA_DATA(rta);
662
663	return algt;
664}
665EXPORT_SYMBOL_GPL(crypto_get_attr_type);
666
667int crypto_check_attr_type(struct rtattr **tb, u32 type)
668{
669	struct crypto_attr_type *algt;
670
671	algt = crypto_get_attr_type(tb);
672	if (IS_ERR(algt))
673		return PTR_ERR(algt);
674
675	if ((algt->type ^ type) & algt->mask)
676		return -EINVAL;
677
678	return 0;
679}
680EXPORT_SYMBOL_GPL(crypto_check_attr_type);
681
682const char *crypto_attr_alg_name(struct rtattr *rta)
683{
684	struct crypto_attr_alg *alga;
685
686	if (!rta)
687		return ERR_PTR(-ENOENT);
688	if (RTA_PAYLOAD(rta) < sizeof(*alga))
689		return ERR_PTR(-EINVAL);
690	if (rta->rta_type != CRYPTOA_ALG)
691		return ERR_PTR(-EINVAL);
692
693	alga = RTA_DATA(rta);
694	alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
695
696	return alga->name;
697}
698EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
699
700struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
701				    const struct crypto_type *frontend,
702				    u32 type, u32 mask)
703{
704	const char *name;
705	int err;
706
707	name = crypto_attr_alg_name(rta);
708	err = PTR_ERR(name);
709	if (IS_ERR(name))
710		return ERR_PTR(err);
711
712	return crypto_find_alg(name, frontend, type, mask);
713}
714EXPORT_SYMBOL_GPL(crypto_attr_alg2);
715
716int crypto_attr_u32(struct rtattr *rta, u32 *num)
717{
718	struct crypto_attr_u32 *nu32;
719
720	if (!rta)
721		return -ENOENT;
722	if (RTA_PAYLOAD(rta) < sizeof(*nu32))
723		return -EINVAL;
724	if (rta->rta_type != CRYPTOA_U32)
725		return -EINVAL;
726
727	nu32 = RTA_DATA(rta);
728	*num = nu32->num;
729
730	return 0;
731}
732EXPORT_SYMBOL_GPL(crypto_attr_u32);
733
734void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
735			     unsigned int head)
736{
737	struct crypto_instance *inst;
738	char *p;
739	int err;
740
741	p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
742		    GFP_KERNEL);
743	if (!p)
744		return ERR_PTR(-ENOMEM);
745
746	inst = (void *)(p + head);
747
748	err = -ENAMETOOLONG;
749	if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
750		     alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
751		goto err_free_inst;
752
753	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
754		     name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
755		goto err_free_inst;
756
757	return p;
758
759err_free_inst:
760	kfree(p);
761	return ERR_PTR(err);
762}
763EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
764
765struct crypto_instance *crypto_alloc_instance(const char *name,
766					      struct crypto_alg *alg)
767{
768	struct crypto_instance *inst;
769	struct crypto_spawn *spawn;
770	int err;
771
772	inst = crypto_alloc_instance2(name, alg, 0);
773	if (IS_ERR(inst))
774		goto out;
775
776	spawn = crypto_instance_ctx(inst);
777	err = crypto_init_spawn(spawn, alg, inst,
778				CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
779
780	if (err)
781		goto err_free_inst;
782
783	return inst;
784
785err_free_inst:
786	kfree(inst);
787	inst = ERR_PTR(err);
788
789out:
790	return inst;
791}
792EXPORT_SYMBOL_GPL(crypto_alloc_instance);
793
794void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
795{
796	INIT_LIST_HEAD(&queue->list);
797	queue->backlog = &queue->list;
798	queue->qlen = 0;
799	queue->max_qlen = max_qlen;
800}
801EXPORT_SYMBOL_GPL(crypto_init_queue);
802
803int crypto_enqueue_request(struct crypto_queue *queue,
804			   struct crypto_async_request *request)
805{
806	int err = -EINPROGRESS;
807
808	if (unlikely(queue->qlen >= queue->max_qlen)) {
809		err = -EBUSY;
810		if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
811			goto out;
812		if (queue->backlog == &queue->list)
813			queue->backlog = &request->list;
814	}
815
816	queue->qlen++;
817	list_add_tail(&request->list, &queue->list);
818
819out:
820	return err;
821}
822EXPORT_SYMBOL_GPL(crypto_enqueue_request);
823
824void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
825{
826	struct list_head *request;
827
828	if (unlikely(!queue->qlen))
829		return NULL;
830
831	queue->qlen--;
832
833	if (queue->backlog != &queue->list)
834		queue->backlog = queue->backlog->next;
835
836	request = queue->list.next;
837	list_del(request);
838
839	return (char *)list_entry(request, struct crypto_async_request, list) -
840	       offset;
841}
842EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
843
844struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
845{
846	return __crypto_dequeue_request(queue, 0);
847}
848EXPORT_SYMBOL_GPL(crypto_dequeue_request);
849
850int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
851{
852	struct crypto_async_request *req;
853
854	list_for_each_entry(req, &queue->list, list) {
855		if (req->tfm == tfm)
856			return 1;
857	}
858
859	return 0;
860}
861EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
862
863static inline void crypto_inc_byte(u8 *a, unsigned int size)
864{
865	u8 *b = (a + size);
866	u8 c;
867
868	for (; size; size--) {
869		c = *--b + 1;
870		*b = c;
871		if (c)
872			break;
873	}
874}
875
876void crypto_inc(u8 *a, unsigned int size)
877{
878	__be32 *b = (__be32 *)(a + size);
879	u32 c;
880
881	for (; size >= 4; size -= 4) {
882		c = be32_to_cpu(*--b) + 1;
883		*b = cpu_to_be32(c);
884		if (c)
885			return;
886	}
887
888	crypto_inc_byte(a, size);
889}
890EXPORT_SYMBOL_GPL(crypto_inc);
891
892static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
893{
894	for (; size; size--)
895		*a++ ^= *b++;
896}
897
898void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
899{
900	u32 *a = (u32 *)dst;
901	u32 *b = (u32 *)src;
902
903	for (; size >= 4; size -= 4)
904		*a++ ^= *b++;
905
906	crypto_xor_byte((u8 *)a, (u8 *)b, size);
907}
908EXPORT_SYMBOL_GPL(crypto_xor);
909
910static int __init crypto_algapi_init(void)
911{
912	crypto_init_proc();
913	return 0;
914}
915
916static void __exit crypto_algapi_exit(void)
917{
918	crypto_exit_proc();
919}
920
921module_init(crypto_algapi_init);
922module_exit(crypto_algapi_exit);
923
924MODULE_LICENSE("GPL");
925MODULE_DESCRIPTION("Cryptographic algorithms API");
926