Root/crypto/algapi.c

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

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