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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 LIST_HEAD(crypto_template_list);
26
27void crypto_larval_error(const char *name, u32 type, u32 mask)
28{
29 struct crypto_alg *alg;
30
31 alg = crypto_alg_lookup(name, type, mask);
32
33 if (alg) {
34 if (crypto_is_larval(alg)) {
35 struct crypto_larval *larval = (void *)alg;
36 complete_all(&larval->completion);
37 }
38 crypto_mod_put(alg);
39 }
40}
41EXPORT_SYMBOL_GPL(crypto_larval_error);
42
43static inline int crypto_set_driver_name(struct crypto_alg *alg)
44{
45 static const char suffix[] = "-generic";
46 char *driver_name = alg->cra_driver_name;
47 int len;
48
49 if (*driver_name)
50 return 0;
51
52 len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
53 if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
54 return -ENAMETOOLONG;
55
56 memcpy(driver_name + len, suffix, sizeof(suffix));
57 return 0;
58}
59
60static int crypto_check_alg(struct crypto_alg *alg)
61{
62 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
63 return -EINVAL;
64
65 if (alg->cra_blocksize > PAGE_SIZE / 8)
66 return -EINVAL;
67
68 if (alg->cra_priority < 0)
69 return -EINVAL;
70
71 return crypto_set_driver_name(alg);
72}
73
74static void crypto_destroy_instance(struct crypto_alg *alg)
75{
76 struct crypto_instance *inst = (void *)alg;
77 struct crypto_template *tmpl = inst->tmpl;
78
79 tmpl->free(inst);
80 crypto_tmpl_put(tmpl);
81}
82
83static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
84 struct list_head *stack,
85 struct list_head *top,
86 struct list_head *secondary_spawns)
87{
88 struct crypto_spawn *spawn, *n;
89
90 if (list_empty(stack))
91 return NULL;
92
93 spawn = list_first_entry(stack, struct crypto_spawn, list);
94 n = list_entry(spawn->list.next, struct crypto_spawn, list);
95
96 if (spawn->alg && &n->list != stack && !n->alg)
97 n->alg = (n->list.next == stack) ? alg :
98 &list_entry(n->list.next, struct crypto_spawn,
99 list)->inst->alg;
100
101 list_move(&spawn->list, secondary_spawns);
102
103 return &n->list == stack ? top : &n->inst->alg.cra_users;
104}
105
106static void crypto_remove_spawn(struct crypto_spawn *spawn,
107 struct list_head *list)
108{
109 struct crypto_instance *inst = spawn->inst;
110 struct crypto_template *tmpl = inst->tmpl;
111
112 if (crypto_is_dead(&inst->alg))
113 return;
114
115 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
116 if (hlist_unhashed(&inst->list))
117 return;
118
119 if (!tmpl || !crypto_tmpl_get(tmpl))
120 return;
121
122 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
123 list_move(&inst->alg.cra_list, list);
124 hlist_del(&inst->list);
125 inst->alg.cra_destroy = crypto_destroy_instance;
126
127 BUG_ON(!list_empty(&inst->alg.cra_users));
128}
129
130void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
131 struct crypto_alg *nalg)
132{
133 u32 new_type = (nalg ?: alg)->cra_flags;
134 struct crypto_spawn *spawn, *n;
135 LIST_HEAD(secondary_spawns);
136 struct list_head *spawns;
137 LIST_HEAD(stack);
138 LIST_HEAD(top);
139
140 spawns = &alg->cra_users;
141 list_for_each_entry_safe(spawn, n, spawns, list) {
142 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
143 continue;
144
145 list_move(&spawn->list, &top);
146 }
147
148 spawns = ⊤
149 do {
150 while (!list_empty(spawns)) {
151 struct crypto_instance *inst;
152
153 spawn = list_first_entry(spawns, struct crypto_spawn,
154 list);
155 inst = spawn->inst;
156
157 BUG_ON(&inst->alg == alg);
158
159 list_move(&spawn->list, &stack);
160
161 if (&inst->alg == nalg)
162 break;
163
164 spawn->alg = NULL;
165 spawns = &inst->alg.cra_users;
166 }
167 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
168 &secondary_spawns)));
169
170 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
171 if (spawn->alg)
172 list_move(&spawn->list, &spawn->alg->cra_users);
173 else
174 crypto_remove_spawn(spawn, list);
175 }
176}
177EXPORT_SYMBOL_GPL(crypto_remove_spawns);
178
179static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
180{
181 struct crypto_alg *q;
182 struct crypto_larval *larval;
183 int ret = -EAGAIN;
184
185 if (crypto_is_dead(alg))
186 goto err;
187
188 INIT_LIST_HEAD(&alg->cra_users);
189
190
191 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
192
193 ret = -EEXIST;
194
195 atomic_set(&alg->cra_refcnt, 1);
196 list_for_each_entry(q, &crypto_alg_list, cra_list) {
197 if (q == alg)
198 goto err;
199
200 if (crypto_is_moribund(q))
201 continue;
202
203 if (crypto_is_larval(q)) {
204 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
205 goto err;
206 continue;
207 }
208
209 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
210 !strcmp(q->cra_name, alg->cra_driver_name))
211 goto err;
212 }
213
214 larval = crypto_larval_alloc(alg->cra_name,
215 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
216 if (IS_ERR(larval))
217 goto out;
218
219 ret = -ENOENT;
220 larval->adult = crypto_mod_get(alg);
221 if (!larval->adult)
222 goto free_larval;
223
224 atomic_set(&larval->alg.cra_refcnt, 1);
225 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
226 CRYPTO_MAX_ALG_NAME);
227 larval->alg.cra_priority = alg->cra_priority;
228
229 list_add(&alg->cra_list, &crypto_alg_list);
230 list_add(&larval->alg.cra_list, &crypto_alg_list);
231
232out:
233 return larval;
234
235free_larval:
236 kfree(larval);
237err:
238 larval = ERR_PTR(ret);
239 goto out;
240}
241
242void crypto_alg_tested(const char *name, int err)
243{
244 struct crypto_larval *test;
245 struct crypto_alg *alg;
246 struct crypto_alg *q;
247 LIST_HEAD(list);
248
249 down_write(&crypto_alg_sem);
250 list_for_each_entry(q, &crypto_alg_list, cra_list) {
251 if (crypto_is_moribund(q) || !crypto_is_larval(q))
252 continue;
253
254 test = (struct crypto_larval *)q;
255
256 if (!strcmp(q->cra_driver_name, name))
257 goto found;
258 }
259
260 printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
261 goto unlock;
262
263found:
264 q->cra_flags |= CRYPTO_ALG_DEAD;
265 alg = test->adult;
266 if (err || list_empty(&alg->cra_list))
267 goto complete;
268
269 alg->cra_flags |= CRYPTO_ALG_TESTED;
270
271 list_for_each_entry(q, &crypto_alg_list, cra_list) {
272 if (q == alg)
273 continue;
274
275 if (crypto_is_moribund(q))
276 continue;
277
278 if (crypto_is_larval(q)) {
279 struct crypto_larval *larval = (void *)q;
280
281
282
283
284
285
286 if (strcmp(alg->cra_name, q->cra_name) &&
287 strcmp(alg->cra_driver_name, q->cra_name))
288 continue;
289
290 if (larval->adult)
291 continue;
292 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
293 continue;
294 if (!crypto_mod_get(alg))
295 continue;
296
297 larval->adult = alg;
298 complete_all(&larval->completion);
299 continue;
300 }
301
302 if (strcmp(alg->cra_name, q->cra_name))
303 continue;
304
305 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
306 q->cra_priority > alg->cra_priority)
307 continue;
308
309 crypto_remove_spawns(q, &list, alg);
310 }
311
312complete:
313 complete_all(&test->completion);
314
315unlock:
316 up_write(&crypto_alg_sem);
317
318 crypto_remove_final(&list);
319}
320EXPORT_SYMBOL_GPL(crypto_alg_tested);
321
322void crypto_remove_final(struct list_head *list)
323{
324 struct crypto_alg *alg;
325 struct crypto_alg *n;
326
327 list_for_each_entry_safe(alg, n, list, cra_list) {
328 list_del_init(&alg->cra_list);
329 crypto_alg_put(alg);
330 }
331}
332EXPORT_SYMBOL_GPL(crypto_remove_final);
333
334static void crypto_wait_for_test(struct crypto_larval *larval)
335{
336 int err;
337
338 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
339 if (err != NOTIFY_STOP) {
340 if (WARN_ON(err != NOTIFY_DONE))
341 goto out;
342 crypto_alg_tested(larval->alg.cra_driver_name, 0);
343 }
344
345 err = wait_for_completion_interruptible(&larval->completion);
346 WARN_ON(err);
347
348out:
349 crypto_larval_kill(&larval->alg);
350}
351
352int crypto_register_alg(struct crypto_alg *alg)
353{
354 struct crypto_larval *larval;
355 int err;
356
357 err = crypto_check_alg(alg);
358 if (err)
359 return err;
360
361 down_write(&crypto_alg_sem);
362 larval = __crypto_register_alg(alg);
363 up_write(&crypto_alg_sem);
364
365 if (IS_ERR(larval))
366 return PTR_ERR(larval);
367
368 crypto_wait_for_test(larval);
369 return 0;
370}
371EXPORT_SYMBOL_GPL(crypto_register_alg);
372
373static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
374{
375 if (unlikely(list_empty(&alg->cra_list)))
376 return -ENOENT;
377
378 alg->cra_flags |= CRYPTO_ALG_DEAD;
379
380 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
381 list_del_init(&alg->cra_list);
382 crypto_remove_spawns(alg, list, NULL);
383
384 return 0;
385}
386
387int crypto_unregister_alg(struct crypto_alg *alg)
388{
389 int ret;
390 LIST_HEAD(list);
391
392 down_write(&crypto_alg_sem);
393 ret = crypto_remove_alg(alg, &list);
394 up_write(&crypto_alg_sem);
395
396 if (ret)
397 return ret;
398
399 BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
400 if (alg->cra_destroy)
401 alg->cra_destroy(alg);
402
403 crypto_remove_final(&list);
404 return 0;
405}
406EXPORT_SYMBOL_GPL(crypto_unregister_alg);
407
408int crypto_register_template(struct crypto_template *tmpl)
409{
410 struct crypto_template *q;
411 int err = -EEXIST;
412
413 down_write(&crypto_alg_sem);
414
415 list_for_each_entry(q, &crypto_template_list, list) {
416 if (q == tmpl)
417 goto out;
418 }
419
420 list_add(&tmpl->list, &crypto_template_list);
421 crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
422 err = 0;
423out:
424 up_write(&crypto_alg_sem);
425 return err;
426}
427EXPORT_SYMBOL_GPL(crypto_register_template);
428
429void crypto_unregister_template(struct crypto_template *tmpl)
430{
431 struct crypto_instance *inst;
432 struct hlist_node *p, *n;
433 struct hlist_head *list;
434 LIST_HEAD(users);
435
436 down_write(&crypto_alg_sem);
437
438 BUG_ON(list_empty(&tmpl->list));
439 list_del_init(&tmpl->list);
440
441 list = &tmpl->instances;
442 hlist_for_each_entry(inst, p, list, list) {
443 int err = crypto_remove_alg(&inst->alg, &users);
444 BUG_ON(err);
445 }
446
447 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
448
449 up_write(&crypto_alg_sem);
450
451 hlist_for_each_entry_safe(inst, p, n, list, list) {
452 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
453 tmpl->free(inst);
454 }
455 crypto_remove_final(&users);
456}
457EXPORT_SYMBOL_GPL(crypto_unregister_template);
458
459static struct crypto_template *__crypto_lookup_template(const char *name)
460{
461 struct crypto_template *q, *tmpl = NULL;
462
463 down_read(&crypto_alg_sem);
464 list_for_each_entry(q, &crypto_template_list, list) {
465 if (strcmp(q->name, name))
466 continue;
467 if (unlikely(!crypto_tmpl_get(q)))
468 continue;
469
470 tmpl = q;
471 break;
472 }
473 up_read(&crypto_alg_sem);
474
475 return tmpl;
476}
477
478struct crypto_template *crypto_lookup_template(const char *name)
479{
480 return try_then_request_module(__crypto_lookup_template(name), name);
481}
482EXPORT_SYMBOL_GPL(crypto_lookup_template);
483
484int crypto_register_instance(struct crypto_template *tmpl,
485 struct crypto_instance *inst)
486{
487 struct crypto_larval *larval;
488 int err;
489
490 err = crypto_check_alg(&inst->alg);
491 if (err)
492 goto err;
493
494 inst->alg.cra_module = tmpl->module;
495 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
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
