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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Cryptographic API for algorithms (i.e., low-level API).
4 *
5 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
6 */
7
8#include <crypto/algapi.h>
9#include <crypto/internal/simd.h>
10#include <linux/err.h>
11#include <linux/errno.h>
12#include <linux/fips.h>
13#include <linux/init.h>
14#include <linux/kernel.h>
15#include <linux/list.h>
16#include <linux/module.h>
17#include <linux/rtnetlink.h>
18#include <linux/slab.h>
19#include <linux/string.h>
20#include <linux/workqueue.h>
21
22#include "internal.h"
23
24static LIST_HEAD(crypto_template_list);
25
26#ifdef CONFIG_CRYPTO_MANAGER_EXTRA_TESTS
27DEFINE_PER_CPU(bool, crypto_simd_disabled_for_test);
28EXPORT_PER_CPU_SYMBOL_GPL(crypto_simd_disabled_for_test);
29#endif
30
31static inline void crypto_check_module_sig(struct module *mod)
32{
33 if (fips_enabled && mod && !module_sig_ok(mod))
34 panic("Module %s signature verification failed in FIPS mode\n",
35 module_name(mod));
36}
37
38static int crypto_check_alg(struct crypto_alg *alg)
39{
40 crypto_check_module_sig(alg->cra_module);
41
42 if (!alg->cra_name[0] || !alg->cra_driver_name[0])
43 return -EINVAL;
44
45 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
46 return -EINVAL;
47
48 /* General maximums for all algs. */
49 if (alg->cra_alignmask > MAX_ALGAPI_ALIGNMASK)
50 return -EINVAL;
51
52 if (alg->cra_blocksize > MAX_ALGAPI_BLOCKSIZE)
53 return -EINVAL;
54
55 /* Lower maximums for specific alg types. */
56 if (!alg->cra_type && (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
57 CRYPTO_ALG_TYPE_CIPHER) {
58 if (alg->cra_alignmask > MAX_CIPHER_ALIGNMASK)
59 return -EINVAL;
60
61 if (alg->cra_blocksize > MAX_CIPHER_BLOCKSIZE)
62 return -EINVAL;
63 }
64
65 if (alg->cra_priority < 0)
66 return -EINVAL;
67
68 refcount_set(&alg->cra_refcnt, 1);
69
70 return 0;
71}
72
73static void crypto_free_instance(struct crypto_instance *inst)
74{
75 inst->alg.cra_type->free(inst);
76}
77
78static void crypto_destroy_instance_workfn(struct work_struct *w)
79{
80 struct crypto_instance *inst = container_of(w, struct crypto_instance,
81 free_work);
82 struct crypto_template *tmpl = inst->tmpl;
83
84 crypto_free_instance(inst);
85 crypto_tmpl_put(tmpl);
86}
87
88static void crypto_destroy_instance(struct crypto_alg *alg)
89{
90 struct crypto_instance *inst = container_of(alg,
91 struct crypto_instance,
92 alg);
93
94 INIT_WORK(&inst->free_work, crypto_destroy_instance_workfn);
95 schedule_work(&inst->free_work);
96}
97
98/*
99 * This function adds a spawn to the list secondary_spawns which
100 * will be used at the end of crypto_remove_spawns to unregister
101 * instances, unless the spawn happens to be one that is depended
102 * on by the new algorithm (nalg in crypto_remove_spawns).
103 *
104 * This function is also responsible for resurrecting any algorithms
105 * in the dependency chain of nalg by unsetting n->dead.
106 */
107static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
108 struct list_head *stack,
109 struct list_head *top,
110 struct list_head *secondary_spawns)
111{
112 struct crypto_spawn *spawn, *n;
113
114 spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
115 if (!spawn)
116 return NULL;
117
118 n = list_prev_entry(spawn, list);
119 list_move(&spawn->list, secondary_spawns);
120
121 if (list_is_last(&n->list, stack))
122 return top;
123
124 n = list_next_entry(n, list);
125 if (!spawn->dead)
126 n->dead = false;
127
128 return &n->inst->alg.cra_users;
129}
130
131static void crypto_remove_instance(struct crypto_instance *inst,
132 struct list_head *list)
133{
134 struct crypto_template *tmpl = inst->tmpl;
135
136 if (crypto_is_dead(&inst->alg))
137 return;
138
139 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
140
141 if (!tmpl || !crypto_tmpl_get(tmpl))
142 return;
143
144 list_move(&inst->alg.cra_list, list);
145 hlist_del(&inst->list);
146 inst->alg.cra_destroy = crypto_destroy_instance;
147
148 BUG_ON(!list_empty(&inst->alg.cra_users));
149}
150
151/*
152 * Given an algorithm alg, remove all algorithms that depend on it
153 * through spawns. If nalg is not null, then exempt any algorithms
154 * that is depended on by nalg. This is useful when nalg itself
155 * depends on alg.
156 */
157void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
158 struct crypto_alg *nalg)
159{
160 u32 new_type = (nalg ?: alg)->cra_flags;
161 struct crypto_spawn *spawn, *n;
162 LIST_HEAD(secondary_spawns);
163 struct list_head *spawns;
164 LIST_HEAD(stack);
165 LIST_HEAD(top);
166
167 spawns = &alg->cra_users;
168 list_for_each_entry_safe(spawn, n, spawns, list) {
169 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
170 continue;
171
172 list_move(&spawn->list, &top);
173 }
174
175 /*
176 * Perform a depth-first walk starting from alg through
177 * the cra_users tree. The list stack records the path
178 * from alg to the current spawn.
179 */
180 spawns = ⊤
181 do {
182 while (!list_empty(spawns)) {
183 struct crypto_instance *inst;
184
185 spawn = list_first_entry(spawns, struct crypto_spawn,
186 list);
187 inst = spawn->inst;
188
189 list_move(&spawn->list, &stack);
190 spawn->dead = !spawn->registered || &inst->alg != nalg;
191
192 if (!spawn->registered)
193 break;
194
195 BUG_ON(&inst->alg == alg);
196
197 if (&inst->alg == nalg)
198 break;
199
200 spawns = &inst->alg.cra_users;
201
202 /*
203 * Even if spawn->registered is true, the
204 * instance itself may still be unregistered.
205 * This is because it may have failed during
206 * registration. Therefore we still need to
207 * make the following test.
208 *
209 * We may encounter an unregistered instance here, since
210 * an instance's spawns are set up prior to the instance
211 * being registered. An unregistered instance will have
212 * NULL ->cra_users.next, since ->cra_users isn't
213 * properly initialized until registration. But an
214 * unregistered instance cannot have any users, so treat
215 * it the same as ->cra_users being empty.
216 */
217 if (spawns->next == NULL)
218 break;
219 }
220 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
221 &secondary_spawns)));
222
223 /*
224 * Remove all instances that are marked as dead. Also
225 * complete the resurrection of the others by moving them
226 * back to the cra_users list.
227 */
228 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
229 if (!spawn->dead)
230 list_move(&spawn->list, &spawn->alg->cra_users);
231 else if (spawn->registered)
232 crypto_remove_instance(spawn->inst, list);
233 }
234}
235EXPORT_SYMBOL_GPL(crypto_remove_spawns);
236
237static void crypto_alg_finish_registration(struct crypto_alg *alg,
238 bool fulfill_requests,
239 struct list_head *algs_to_put)
240{
241 struct crypto_alg *q;
242
243 list_for_each_entry(q, &crypto_alg_list, cra_list) {
244 if (q == alg)
245 continue;
246
247 if (crypto_is_moribund(q))
248 continue;
249
250 if (crypto_is_larval(q)) {
251 struct crypto_larval *larval = (void *)q;
252
253 /*
254 * Check to see if either our generic name or
255 * specific name can satisfy the name requested
256 * by the larval entry q.
257 */
258 if (strcmp(alg->cra_name, q->cra_name) &&
259 strcmp(alg->cra_driver_name, q->cra_name))
260 continue;
261
262 if (larval->adult)
263 continue;
264 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
265 continue;
266
267 if (fulfill_requests && crypto_mod_get(alg))
268 larval->adult = alg;
269 else
270 larval->adult = ERR_PTR(-EAGAIN);
271
272 continue;
273 }
274
275 if (strcmp(alg->cra_name, q->cra_name))
276 continue;
277
278 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
279 q->cra_priority > alg->cra_priority)
280 continue;
281
282 crypto_remove_spawns(q, algs_to_put, alg);
283 }
284
285 crypto_notify(CRYPTO_MSG_ALG_LOADED, alg);
286}
287
288static struct crypto_larval *crypto_alloc_test_larval(struct crypto_alg *alg)
289{
290 struct crypto_larval *larval;
291
292 if (!IS_ENABLED(CONFIG_CRYPTO_MANAGER) ||
293 IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS) ||
294 (alg->cra_flags & CRYPTO_ALG_INTERNAL))
295 return NULL; /* No self-test needed */
296
297 larval = crypto_larval_alloc(alg->cra_name,
298 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
299 if (IS_ERR(larval))
300 return larval;
301
302 larval->adult = crypto_mod_get(alg);
303 if (!larval->adult) {
304 kfree(larval);
305 return ERR_PTR(-ENOENT);
306 }
307
308 refcount_set(&larval->alg.cra_refcnt, 1);
309 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
310 CRYPTO_MAX_ALG_NAME);
311 larval->alg.cra_priority = alg->cra_priority;
312
313 return larval;
314}
315
316static struct crypto_larval *
317__crypto_register_alg(struct crypto_alg *alg, struct list_head *algs_to_put)
318{
319 struct crypto_alg *q;
320 struct crypto_larval *larval;
321 int ret = -EAGAIN;
322
323 if (crypto_is_dead(alg))
324 goto err;
325
326 INIT_LIST_HEAD(&alg->cra_users);
327
328 ret = -EEXIST;
329
330 list_for_each_entry(q, &crypto_alg_list, cra_list) {
331 if (q == alg)
332 goto err;
333
334 if (crypto_is_moribund(q))
335 continue;
336
337 if (crypto_is_larval(q)) {
338 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
339 goto err;
340 continue;
341 }
342
343 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
344 !strcmp(q->cra_driver_name, alg->cra_driver_name) ||
345 !strcmp(q->cra_name, alg->cra_driver_name))
346 goto err;
347 }
348
349 larval = crypto_alloc_test_larval(alg);
350 if (IS_ERR(larval))
351 goto out;
352
353 list_add(&alg->cra_list, &crypto_alg_list);
354
355 if (larval) {
356 /* No cheating! */
357 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
358
359 list_add(&larval->alg.cra_list, &crypto_alg_list);
360 } else {
361 alg->cra_flags |= CRYPTO_ALG_TESTED;
362 crypto_alg_finish_registration(alg, true, algs_to_put);
363 }
364
365out:
366 return larval;
367
368err:
369 larval = ERR_PTR(ret);
370 goto out;
371}
372
373void crypto_alg_tested(const char *name, int err)
374{
375 struct crypto_larval *test;
376 struct crypto_alg *alg;
377 struct crypto_alg *q;
378 LIST_HEAD(list);
379 bool best;
380
381 down_write(&crypto_alg_sem);
382 list_for_each_entry(q, &crypto_alg_list, cra_list) {
383 if (crypto_is_moribund(q) || !crypto_is_larval(q))
384 continue;
385
386 test = (struct crypto_larval *)q;
387
388 if (!strcmp(q->cra_driver_name, name))
389 goto found;
390 }
391
392 pr_err("alg: Unexpected test result for %s: %d\n", name, err);
393 goto unlock;
394
395found:
396 q->cra_flags |= CRYPTO_ALG_DEAD;
397 alg = test->adult;
398
399 if (list_empty(&alg->cra_list))
400 goto complete;
401
402 if (err == -ECANCELED)
403 alg->cra_flags |= CRYPTO_ALG_FIPS_INTERNAL;
404 else if (err)
405 goto complete;
406 else
407 alg->cra_flags &= ~CRYPTO_ALG_FIPS_INTERNAL;
408
409 alg->cra_flags |= CRYPTO_ALG_TESTED;
410
411 /*
412 * If a higher-priority implementation of the same algorithm is
413 * currently being tested, then don't fulfill request larvals.
414 */
415 best = true;
416 list_for_each_entry(q, &crypto_alg_list, cra_list) {
417 if (crypto_is_moribund(q) || !crypto_is_larval(q))
418 continue;
419
420 if (strcmp(alg->cra_name, q->cra_name))
421 continue;
422
423 if (q->cra_priority > alg->cra_priority) {
424 best = false;
425 break;
426 }
427 }
428
429 crypto_alg_finish_registration(alg, best, &list);
430
431complete:
432 complete_all(&test->completion);
433
434unlock:
435 up_write(&crypto_alg_sem);
436
437 crypto_remove_final(&list);
438}
439EXPORT_SYMBOL_GPL(crypto_alg_tested);
440
441void crypto_remove_final(struct list_head *list)
442{
443 struct crypto_alg *alg;
444 struct crypto_alg *n;
445
446 list_for_each_entry_safe(alg, n, list, cra_list) {
447 list_del_init(&alg->cra_list);
448 crypto_alg_put(alg);
449 }
450}
451EXPORT_SYMBOL_GPL(crypto_remove_final);
452
453int crypto_register_alg(struct crypto_alg *alg)
454{
455 struct crypto_larval *larval;
456 LIST_HEAD(algs_to_put);
457 bool test_started = false;
458 int err;
459
460 alg->cra_flags &= ~CRYPTO_ALG_DEAD;
461 err = crypto_check_alg(alg);
462 if (err)
463 return err;
464
465 down_write(&crypto_alg_sem);
466 larval = __crypto_register_alg(alg, &algs_to_put);
467 if (!IS_ERR_OR_NULL(larval)) {
468 test_started = crypto_boot_test_finished();
469 larval->test_started = test_started;
470 }
471 up_write(&crypto_alg_sem);
472
473 if (IS_ERR(larval))
474 return PTR_ERR(larval);
475 if (test_started)
476 crypto_wait_for_test(larval);
477 crypto_remove_final(&algs_to_put);
478 return 0;
479}
480EXPORT_SYMBOL_GPL(crypto_register_alg);
481
482static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
483{
484 if (unlikely(list_empty(&alg->cra_list)))
485 return -ENOENT;
486
487 alg->cra_flags |= CRYPTO_ALG_DEAD;
488
489 list_del_init(&alg->cra_list);
490 crypto_remove_spawns(alg, list, NULL);
491
492 return 0;
493}
494
495void crypto_unregister_alg(struct crypto_alg *alg)
496{
497 int ret;
498 LIST_HEAD(list);
499
500 down_write(&crypto_alg_sem);
501 ret = crypto_remove_alg(alg, &list);
502 up_write(&crypto_alg_sem);
503
504 if (WARN(ret, "Algorithm %s is not registered", alg->cra_driver_name))
505 return;
506
507 if (WARN_ON(refcount_read(&alg->cra_refcnt) != 1))
508 return;
509
510 if (alg->cra_destroy)
511 alg->cra_destroy(alg);
512
513 crypto_remove_final(&list);
514}
515EXPORT_SYMBOL_GPL(crypto_unregister_alg);
516
517int crypto_register_algs(struct crypto_alg *algs, int count)
518{
519 int i, ret;
520
521 for (i = 0; i < count; i++) {
522 ret = crypto_register_alg(&algs[i]);
523 if (ret)
524 goto err;
525 }
526
527 return 0;
528
529err:
530 for (--i; i >= 0; --i)
531 crypto_unregister_alg(&algs[i]);
532
533 return ret;
534}
535EXPORT_SYMBOL_GPL(crypto_register_algs);
536
537void crypto_unregister_algs(struct crypto_alg *algs, int count)
538{
539 int i;
540
541 for (i = 0; i < count; i++)
542 crypto_unregister_alg(&algs[i]);
543}
544EXPORT_SYMBOL_GPL(crypto_unregister_algs);
545
546int crypto_register_template(struct crypto_template *tmpl)
547{
548 struct crypto_template *q;
549 int err = -EEXIST;
550
551 down_write(&crypto_alg_sem);
552
553 crypto_check_module_sig(tmpl->module);
554
555 list_for_each_entry(q, &crypto_template_list, list) {
556 if (q == tmpl)
557 goto out;
558 }
559
560 list_add(&tmpl->list, &crypto_template_list);
561 err = 0;
562out:
563 up_write(&crypto_alg_sem);
564 return err;
565}
566EXPORT_SYMBOL_GPL(crypto_register_template);
567
568int crypto_register_templates(struct crypto_template *tmpls, int count)
569{
570 int i, err;
571
572 for (i = 0; i < count; i++) {
573 err = crypto_register_template(&tmpls[i]);
574 if (err)
575 goto out;
576 }
577 return 0;
578
579out:
580 for (--i; i >= 0; --i)
581 crypto_unregister_template(&tmpls[i]);
582 return err;
583}
584EXPORT_SYMBOL_GPL(crypto_register_templates);
585
586void crypto_unregister_template(struct crypto_template *tmpl)
587{
588 struct crypto_instance *inst;
589 struct hlist_node *n;
590 struct hlist_head *list;
591 LIST_HEAD(users);
592
593 down_write(&crypto_alg_sem);
594
595 BUG_ON(list_empty(&tmpl->list));
596 list_del_init(&tmpl->list);
597
598 list = &tmpl->instances;
599 hlist_for_each_entry(inst, list, list) {
600 int err = crypto_remove_alg(&inst->alg, &users);
601
602 BUG_ON(err);
603 }
604
605 up_write(&crypto_alg_sem);
606
607 hlist_for_each_entry_safe(inst, n, list, list) {
608 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
609 crypto_free_instance(inst);
610 }
611 crypto_remove_final(&users);
612}
613EXPORT_SYMBOL_GPL(crypto_unregister_template);
614
615void crypto_unregister_templates(struct crypto_template *tmpls, int count)
616{
617 int i;
618
619 for (i = count - 1; i >= 0; --i)
620 crypto_unregister_template(&tmpls[i]);
621}
622EXPORT_SYMBOL_GPL(crypto_unregister_templates);
623
624static struct crypto_template *__crypto_lookup_template(const char *name)
625{
626 struct crypto_template *q, *tmpl = NULL;
627
628 down_read(&crypto_alg_sem);
629 list_for_each_entry(q, &crypto_template_list, list) {
630 if (strcmp(q->name, name))
631 continue;
632 if (unlikely(!crypto_tmpl_get(q)))
633 continue;
634
635 tmpl = q;
636 break;
637 }
638 up_read(&crypto_alg_sem);
639
640 return tmpl;
641}
642
643struct crypto_template *crypto_lookup_template(const char *name)
644{
645 return try_then_request_module(__crypto_lookup_template(name),
646 "crypto-%s", name);
647}
648EXPORT_SYMBOL_GPL(crypto_lookup_template);
649
650int crypto_register_instance(struct crypto_template *tmpl,
651 struct crypto_instance *inst)
652{
653 struct crypto_larval *larval;
654 struct crypto_spawn *spawn;
655 u32 fips_internal = 0;
656 LIST_HEAD(algs_to_put);
657 int err;
658
659 err = crypto_check_alg(&inst->alg);
660 if (err)
661 return err;
662
663 inst->alg.cra_module = tmpl->module;
664 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
665
666 down_write(&crypto_alg_sem);
667
668 larval = ERR_PTR(-EAGAIN);
669 for (spawn = inst->spawns; spawn;) {
670 struct crypto_spawn *next;
671
672 if (spawn->dead)
673 goto unlock;
674
675 next = spawn->next;
676 spawn->inst = inst;
677 spawn->registered = true;
678
679 fips_internal |= spawn->alg->cra_flags;
680
681 crypto_mod_put(spawn->alg);
682
683 spawn = next;
684 }
685
686 inst->alg.cra_flags |= (fips_internal & CRYPTO_ALG_FIPS_INTERNAL);
687
688 larval = __crypto_register_alg(&inst->alg, &algs_to_put);
689 if (IS_ERR(larval))
690 goto unlock;
691 else if (larval)
692 larval->test_started = true;
693
694 hlist_add_head(&inst->list, &tmpl->instances);
695 inst->tmpl = tmpl;
696
697unlock:
698 up_write(&crypto_alg_sem);
699
700 if (IS_ERR(larval))
701 return PTR_ERR(larval);
702 if (larval)
703 crypto_wait_for_test(larval);
704 crypto_remove_final(&algs_to_put);
705 return 0;
706}
707EXPORT_SYMBOL_GPL(crypto_register_instance);
708
709void crypto_unregister_instance(struct crypto_instance *inst)
710{
711 LIST_HEAD(list);
712
713 down_write(&crypto_alg_sem);
714
715 crypto_remove_spawns(&inst->alg, &list, NULL);
716 crypto_remove_instance(inst, &list);
717
718 up_write(&crypto_alg_sem);
719
720 crypto_remove_final(&list);
721}
722EXPORT_SYMBOL_GPL(crypto_unregister_instance);
723
724int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
725 const char *name, u32 type, u32 mask)
726{
727 struct crypto_alg *alg;
728 int err = -EAGAIN;
729
730 if (WARN_ON_ONCE(inst == NULL))
731 return -EINVAL;
732
733 /* Allow the result of crypto_attr_alg_name() to be passed directly */
734 if (IS_ERR(name))
735 return PTR_ERR(name);
736
737 alg = crypto_find_alg(name, spawn->frontend,
738 type | CRYPTO_ALG_FIPS_INTERNAL, mask);
739 if (IS_ERR(alg))
740 return PTR_ERR(alg);
741
742 down_write(&crypto_alg_sem);
743 if (!crypto_is_moribund(alg)) {
744 list_add(&spawn->list, &alg->cra_users);
745 spawn->alg = alg;
746 spawn->mask = mask;
747 spawn->next = inst->spawns;
748 inst->spawns = spawn;
749 inst->alg.cra_flags |=
750 (alg->cra_flags & CRYPTO_ALG_INHERITED_FLAGS);
751 err = 0;
752 }
753 up_write(&crypto_alg_sem);
754 if (err)
755 crypto_mod_put(alg);
756 return err;
757}
758EXPORT_SYMBOL_GPL(crypto_grab_spawn);
759
760void crypto_drop_spawn(struct crypto_spawn *spawn)
761{
762 if (!spawn->alg) /* not yet initialized? */
763 return;
764
765 down_write(&crypto_alg_sem);
766 if (!spawn->dead)
767 list_del(&spawn->list);
768 up_write(&crypto_alg_sem);
769
770 if (!spawn->registered)
771 crypto_mod_put(spawn->alg);
772}
773EXPORT_SYMBOL_GPL(crypto_drop_spawn);
774
775static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
776{
777 struct crypto_alg *alg = ERR_PTR(-EAGAIN);
778 struct crypto_alg *target;
779 bool shoot = false;
780
781 down_read(&crypto_alg_sem);
782 if (!spawn->dead) {
783 alg = spawn->alg;
784 if (!crypto_mod_get(alg)) {
785 target = crypto_alg_get(alg);
786 shoot = true;
787 alg = ERR_PTR(-EAGAIN);
788 }
789 }
790 up_read(&crypto_alg_sem);
791
792 if (shoot) {
793 crypto_shoot_alg(target);
794 crypto_alg_put(target);
795 }
796
797 return alg;
798}
799
800struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
801 u32 mask)
802{
803 struct crypto_alg *alg;
804 struct crypto_tfm *tfm;
805
806 alg = crypto_spawn_alg(spawn);
807 if (IS_ERR(alg))
808 return ERR_CAST(alg);
809
810 tfm = ERR_PTR(-EINVAL);
811 if (unlikely((alg->cra_flags ^ type) & mask))
812 goto out_put_alg;
813
814 tfm = __crypto_alloc_tfm(alg, type, mask);
815 if (IS_ERR(tfm))
816 goto out_put_alg;
817
818 return tfm;
819
820out_put_alg:
821 crypto_mod_put(alg);
822 return tfm;
823}
824EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
825
826void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
827{
828 struct crypto_alg *alg;
829 struct crypto_tfm *tfm;
830
831 alg = crypto_spawn_alg(spawn);
832 if (IS_ERR(alg))
833 return ERR_CAST(alg);
834
835 tfm = crypto_create_tfm(alg, spawn->frontend);
836 if (IS_ERR(tfm))
837 goto out_put_alg;
838
839 return tfm;
840
841out_put_alg:
842 crypto_mod_put(alg);
843 return tfm;
844}
845EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
846
847int crypto_register_notifier(struct notifier_block *nb)
848{
849 return blocking_notifier_chain_register(&crypto_chain, nb);
850}
851EXPORT_SYMBOL_GPL(crypto_register_notifier);
852
853int crypto_unregister_notifier(struct notifier_block *nb)
854{
855 return blocking_notifier_chain_unregister(&crypto_chain, nb);
856}
857EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
858
859struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
860{
861 struct rtattr *rta = tb[0];
862 struct crypto_attr_type *algt;
863
864 if (!rta)
865 return ERR_PTR(-ENOENT);
866 if (RTA_PAYLOAD(rta) < sizeof(*algt))
867 return ERR_PTR(-EINVAL);
868 if (rta->rta_type != CRYPTOA_TYPE)
869 return ERR_PTR(-EINVAL);
870
871 algt = RTA_DATA(rta);
872
873 return algt;
874}
875EXPORT_SYMBOL_GPL(crypto_get_attr_type);
876
877/**
878 * crypto_check_attr_type() - check algorithm type and compute inherited mask
879 * @tb: the template parameters
880 * @type: the algorithm type the template would be instantiated as
881 * @mask_ret: (output) the mask that should be passed to crypto_grab_*()
882 * to restrict the flags of any inner algorithms
883 *
884 * Validate that the algorithm type the user requested is compatible with the
885 * one the template would actually be instantiated as. E.g., if the user is
886 * doing crypto_alloc_shash("cbc(aes)", ...), this would return an error because
887 * the "cbc" template creates an "skcipher" algorithm, not an "shash" algorithm.
888 *
889 * Also compute the mask to use to restrict the flags of any inner algorithms.
890 *
891 * Return: 0 on success; -errno on failure
892 */
893int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret)
894{
895 struct crypto_attr_type *algt;
896
897 algt = crypto_get_attr_type(tb);
898 if (IS_ERR(algt))
899 return PTR_ERR(algt);
900
901 if ((algt->type ^ type) & algt->mask)
902 return -EINVAL;
903
904 *mask_ret = crypto_algt_inherited_mask(algt);
905 return 0;
906}
907EXPORT_SYMBOL_GPL(crypto_check_attr_type);
908
909const char *crypto_attr_alg_name(struct rtattr *rta)
910{
911 struct crypto_attr_alg *alga;
912
913 if (!rta)
914 return ERR_PTR(-ENOENT);
915 if (RTA_PAYLOAD(rta) < sizeof(*alga))
916 return ERR_PTR(-EINVAL);
917 if (rta->rta_type != CRYPTOA_ALG)
918 return ERR_PTR(-EINVAL);
919
920 alga = RTA_DATA(rta);
921 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
922
923 return alga->name;
924}
925EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
926
927int crypto_inst_setname(struct crypto_instance *inst, const char *name,
928 struct crypto_alg *alg)
929{
930 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
931 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
932 return -ENAMETOOLONG;
933
934 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
935 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
936 return -ENAMETOOLONG;
937
938 return 0;
939}
940EXPORT_SYMBOL_GPL(crypto_inst_setname);
941
942void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
943{
944 INIT_LIST_HEAD(&queue->list);
945 queue->backlog = &queue->list;
946 queue->qlen = 0;
947 queue->max_qlen = max_qlen;
948}
949EXPORT_SYMBOL_GPL(crypto_init_queue);
950
951int crypto_enqueue_request(struct crypto_queue *queue,
952 struct crypto_async_request *request)
953{
954 int err = -EINPROGRESS;
955
956 if (unlikely(queue->qlen >= queue->max_qlen)) {
957 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
958 err = -ENOSPC;
959 goto out;
960 }
961 err = -EBUSY;
962 if (queue->backlog == &queue->list)
963 queue->backlog = &request->list;
964 }
965
966 queue->qlen++;
967 list_add_tail(&request->list, &queue->list);
968
969out:
970 return err;
971}
972EXPORT_SYMBOL_GPL(crypto_enqueue_request);
973
974void crypto_enqueue_request_head(struct crypto_queue *queue,
975 struct crypto_async_request *request)
976{
977 if (unlikely(queue->qlen >= queue->max_qlen))
978 queue->backlog = queue->backlog->prev;
979
980 queue->qlen++;
981 list_add(&request->list, &queue->list);
982}
983EXPORT_SYMBOL_GPL(crypto_enqueue_request_head);
984
985struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
986{
987 struct list_head *request;
988
989 if (unlikely(!queue->qlen))
990 return NULL;
991
992 queue->qlen--;
993
994 if (queue->backlog != &queue->list)
995 queue->backlog = queue->backlog->next;
996
997 request = queue->list.next;
998 list_del(request);
999
1000 return list_entry(request, struct crypto_async_request, list);
1001}
1002EXPORT_SYMBOL_GPL(crypto_dequeue_request);
1003
1004static inline void crypto_inc_byte(u8 *a, unsigned int size)
1005{
1006 u8 *b = (a + size);
1007 u8 c;
1008
1009 for (; size; size--) {
1010 c = *--b + 1;
1011 *b = c;
1012 if (c)
1013 break;
1014 }
1015}
1016
1017void crypto_inc(u8 *a, unsigned int size)
1018{
1019 __be32 *b = (__be32 *)(a + size);
1020 u32 c;
1021
1022 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
1023 IS_ALIGNED((unsigned long)b, __alignof__(*b)))
1024 for (; size >= 4; size -= 4) {
1025 c = be32_to_cpu(*--b) + 1;
1026 *b = cpu_to_be32(c);
1027 if (likely(c))
1028 return;
1029 }
1030
1031 crypto_inc_byte(a, size);
1032}
1033EXPORT_SYMBOL_GPL(crypto_inc);
1034
1035unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1036{
1037 return alg->cra_ctxsize +
1038 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1039}
1040EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1041
1042int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1043 u32 type, u32 mask)
1044{
1045 int ret = 0;
1046 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1047
1048 if (!IS_ERR(alg)) {
1049 crypto_mod_put(alg);
1050 ret = 1;
1051 }
1052
1053 return ret;
1054}
1055EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1056
1057static void __init crypto_start_tests(void)
1058{
1059 if (IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS))
1060 return;
1061
1062 for (;;) {
1063 struct crypto_larval *larval = NULL;
1064 struct crypto_alg *q;
1065
1066 down_write(&crypto_alg_sem);
1067
1068 list_for_each_entry(q, &crypto_alg_list, cra_list) {
1069 struct crypto_larval *l;
1070
1071 if (!crypto_is_larval(q))
1072 continue;
1073
1074 l = (void *)q;
1075
1076 if (!crypto_is_test_larval(l))
1077 continue;
1078
1079 if (l->test_started)
1080 continue;
1081
1082 l->test_started = true;
1083 larval = l;
1084 break;
1085 }
1086
1087 up_write(&crypto_alg_sem);
1088
1089 if (!larval)
1090 break;
1091
1092 crypto_wait_for_test(larval);
1093 }
1094
1095 set_crypto_boot_test_finished();
1096}
1097
1098static int __init crypto_algapi_init(void)
1099{
1100 crypto_init_proc();
1101 crypto_start_tests();
1102 return 0;
1103}
1104
1105static void __exit crypto_algapi_exit(void)
1106{
1107 crypto_exit_proc();
1108}
1109
1110/*
1111 * We run this at late_initcall so that all the built-in algorithms
1112 * have had a chance to register themselves first.
1113 */
1114late_initcall(crypto_algapi_init);
1115module_exit(crypto_algapi_exit);
1116
1117MODULE_LICENSE("GPL");
1118MODULE_DESCRIPTION("Cryptographic algorithms API");
1119MODULE_SOFTDEP("pre: cryptomgr");
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 LIST_HEAD(crypto_template_list);
26
27static inline int crypto_set_driver_name(struct crypto_alg *alg)
28{
29 static const char suffix[] = "-generic";
30 char *driver_name = alg->cra_driver_name;
31 int len;
32
33 if (*driver_name)
34 return 0;
35
36 len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
37 if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
38 return -ENAMETOOLONG;
39
40 memcpy(driver_name + len, suffix, sizeof(suffix));
41 return 0;
42}
43
44static int crypto_check_alg(struct crypto_alg *alg)
45{
46 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
47 return -EINVAL;
48
49 if (alg->cra_blocksize > PAGE_SIZE / 8)
50 return -EINVAL;
51
52 if (alg->cra_priority < 0)
53 return -EINVAL;
54
55 return crypto_set_driver_name(alg);
56}
57
58static void crypto_destroy_instance(struct crypto_alg *alg)
59{
60 struct crypto_instance *inst = (void *)alg;
61 struct crypto_template *tmpl = inst->tmpl;
62
63 tmpl->free(inst);
64 crypto_tmpl_put(tmpl);
65}
66
67static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
68 struct list_head *stack,
69 struct list_head *top,
70 struct list_head *secondary_spawns)
71{
72 struct crypto_spawn *spawn, *n;
73
74 if (list_empty(stack))
75 return NULL;
76
77 spawn = list_first_entry(stack, struct crypto_spawn, list);
78 n = list_entry(spawn->list.next, struct crypto_spawn, list);
79
80 if (spawn->alg && &n->list != stack && !n->alg)
81 n->alg = (n->list.next == stack) ? alg :
82 &list_entry(n->list.next, struct crypto_spawn,
83 list)->inst->alg;
84
85 list_move(&spawn->list, secondary_spawns);
86
87 return &n->list == stack ? top : &n->inst->alg.cra_users;
88}
89
90static void crypto_remove_spawn(struct crypto_spawn *spawn,
91 struct list_head *list)
92{
93 struct crypto_instance *inst = spawn->inst;
94 struct crypto_template *tmpl = inst->tmpl;
95
96 if (crypto_is_dead(&inst->alg))
97 return;
98
99 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
100 if (hlist_unhashed(&inst->list))
101 return;
102
103 if (!tmpl || !crypto_tmpl_get(tmpl))
104 return;
105
106 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
107 list_move(&inst->alg.cra_list, list);
108 hlist_del(&inst->list);
109 inst->alg.cra_destroy = crypto_destroy_instance;
110
111 BUG_ON(!list_empty(&inst->alg.cra_users));
112}
113
114void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
115 struct crypto_alg *nalg)
116{
117 u32 new_type = (nalg ?: alg)->cra_flags;
118 struct crypto_spawn *spawn, *n;
119 LIST_HEAD(secondary_spawns);
120 struct list_head *spawns;
121 LIST_HEAD(stack);
122 LIST_HEAD(top);
123
124 spawns = &alg->cra_users;
125 list_for_each_entry_safe(spawn, n, spawns, list) {
126 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
127 continue;
128
129 list_move(&spawn->list, &top);
130 }
131
132 spawns = ⊤
133 do {
134 while (!list_empty(spawns)) {
135 struct crypto_instance *inst;
136
137 spawn = list_first_entry(spawns, struct crypto_spawn,
138 list);
139 inst = spawn->inst;
140
141 BUG_ON(&inst->alg == alg);
142
143 list_move(&spawn->list, &stack);
144
145 if (&inst->alg == nalg)
146 break;
147
148 spawn->alg = NULL;
149 spawns = &inst->alg.cra_users;
150 }
151 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
152 &secondary_spawns)));
153
154 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
155 if (spawn->alg)
156 list_move(&spawn->list, &spawn->alg->cra_users);
157 else
158 crypto_remove_spawn(spawn, list);
159 }
160}
161EXPORT_SYMBOL_GPL(crypto_remove_spawns);
162
163static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
164{
165 struct crypto_alg *q;
166 struct crypto_larval *larval;
167 int ret = -EAGAIN;
168
169 if (crypto_is_dead(alg))
170 goto err;
171
172 INIT_LIST_HEAD(&alg->cra_users);
173
174 /* No cheating! */
175 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
176
177 ret = -EEXIST;
178
179 atomic_set(&alg->cra_refcnt, 1);
180 list_for_each_entry(q, &crypto_alg_list, cra_list) {
181 if (q == alg)
182 goto err;
183
184 if (crypto_is_moribund(q))
185 continue;
186
187 if (crypto_is_larval(q)) {
188 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
189 goto err;
190 continue;
191 }
192
193 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
194 !strcmp(q->cra_name, alg->cra_driver_name))
195 goto err;
196 }
197
198 larval = crypto_larval_alloc(alg->cra_name,
199 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
200 if (IS_ERR(larval))
201 goto out;
202
203 ret = -ENOENT;
204 larval->adult = crypto_mod_get(alg);
205 if (!larval->adult)
206 goto free_larval;
207
208 atomic_set(&larval->alg.cra_refcnt, 1);
209 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
210 CRYPTO_MAX_ALG_NAME);
211 larval->alg.cra_priority = alg->cra_priority;
212
213 list_add(&alg->cra_list, &crypto_alg_list);
214 list_add(&larval->alg.cra_list, &crypto_alg_list);
215
216out:
217 return larval;
218
219free_larval:
220 kfree(larval);
221err:
222 larval = ERR_PTR(ret);
223 goto out;
224}
225
226void crypto_alg_tested(const char *name, int err)
227{
228 struct crypto_larval *test;
229 struct crypto_alg *alg;
230 struct crypto_alg *q;
231 LIST_HEAD(list);
232
233 down_write(&crypto_alg_sem);
234 list_for_each_entry(q, &crypto_alg_list, cra_list) {
235 if (crypto_is_moribund(q) || !crypto_is_larval(q))
236 continue;
237
238 test = (struct crypto_larval *)q;
239
240 if (!strcmp(q->cra_driver_name, name))
241 goto found;
242 }
243
244 printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
245 goto unlock;
246
247found:
248 q->cra_flags |= CRYPTO_ALG_DEAD;
249 alg = test->adult;
250 if (err || list_empty(&alg->cra_list))
251 goto complete;
252
253 alg->cra_flags |= CRYPTO_ALG_TESTED;
254
255 list_for_each_entry(q, &crypto_alg_list, cra_list) {
256 if (q == alg)
257 continue;
258
259 if (crypto_is_moribund(q))
260 continue;
261
262 if (crypto_is_larval(q)) {
263 struct crypto_larval *larval = (void *)q;
264
265 /*
266 * Check to see if either our generic name or
267 * specific name can satisfy the name requested
268 * by the larval entry q.
269 */
270 if (strcmp(alg->cra_name, q->cra_name) &&
271 strcmp(alg->cra_driver_name, q->cra_name))
272 continue;
273
274 if (larval->adult)
275 continue;
276 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
277 continue;
278 if (!crypto_mod_get(alg))
279 continue;
280
281 larval->adult = alg;
282 continue;
283 }
284
285 if (strcmp(alg->cra_name, q->cra_name))
286 continue;
287
288 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
289 q->cra_priority > alg->cra_priority)
290 continue;
291
292 crypto_remove_spawns(q, &list, alg);
293 }
294
295complete:
296 complete_all(&test->completion);
297
298unlock:
299 up_write(&crypto_alg_sem);
300
301 crypto_remove_final(&list);
302}
303EXPORT_SYMBOL_GPL(crypto_alg_tested);
304
305void crypto_remove_final(struct list_head *list)
306{
307 struct crypto_alg *alg;
308 struct crypto_alg *n;
309
310 list_for_each_entry_safe(alg, n, list, cra_list) {
311 list_del_init(&alg->cra_list);
312 crypto_alg_put(alg);
313 }
314}
315EXPORT_SYMBOL_GPL(crypto_remove_final);
316
317static void crypto_wait_for_test(struct crypto_larval *larval)
318{
319 int err;
320
321 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
322 if (err != NOTIFY_STOP) {
323 if (WARN_ON(err != NOTIFY_DONE))
324 goto out;
325 crypto_alg_tested(larval->alg.cra_driver_name, 0);
326 }
327
328 err = wait_for_completion_interruptible(&larval->completion);
329 WARN_ON(err);
330
331out:
332 crypto_larval_kill(&larval->alg);
333}
334
335int crypto_register_alg(struct crypto_alg *alg)
336{
337 struct crypto_larval *larval;
338 int err;
339
340 err = crypto_check_alg(alg);
341 if (err)
342 return err;
343
344 down_write(&crypto_alg_sem);
345 larval = __crypto_register_alg(alg);
346 up_write(&crypto_alg_sem);
347
348 if (IS_ERR(larval))
349 return PTR_ERR(larval);
350
351 crypto_wait_for_test(larval);
352 return 0;
353}
354EXPORT_SYMBOL_GPL(crypto_register_alg);
355
356static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
357{
358 if (unlikely(list_empty(&alg->cra_list)))
359 return -ENOENT;
360
361 alg->cra_flags |= CRYPTO_ALG_DEAD;
362
363 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
364 list_del_init(&alg->cra_list);
365 crypto_remove_spawns(alg, list, NULL);
366
367 return 0;
368}
369
370int crypto_unregister_alg(struct crypto_alg *alg)
371{
372 int ret;
373 LIST_HEAD(list);
374
375 down_write(&crypto_alg_sem);
376 ret = crypto_remove_alg(alg, &list);
377 up_write(&crypto_alg_sem);
378
379 if (ret)
380 return ret;
381
382 BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
383 if (alg->cra_destroy)
384 alg->cra_destroy(alg);
385
386 crypto_remove_final(&list);
387 return 0;
388}
389EXPORT_SYMBOL_GPL(crypto_unregister_alg);
390
391int crypto_register_algs(struct crypto_alg *algs, int count)
392{
393 int i, ret;
394
395 for (i = 0; i < count; i++) {
396 ret = crypto_register_alg(&algs[i]);
397 if (ret)
398 goto err;
399 }
400
401 return 0;
402
403err:
404 for (--i; i >= 0; --i)
405 crypto_unregister_alg(&algs[i]);
406
407 return ret;
408}
409EXPORT_SYMBOL_GPL(crypto_register_algs);
410
411int crypto_unregister_algs(struct crypto_alg *algs, int count)
412{
413 int i, ret;
414
415 for (i = 0; i < count; i++) {
416 ret = crypto_unregister_alg(&algs[i]);
417 if (ret)
418 pr_err("Failed to unregister %s %s: %d\n",
419 algs[i].cra_driver_name, algs[i].cra_name, ret);
420 }
421
422 return 0;
423}
424EXPORT_SYMBOL_GPL(crypto_unregister_algs);
425
426int crypto_register_template(struct crypto_template *tmpl)
427{
428 struct crypto_template *q;
429 int err = -EEXIST;
430
431 down_write(&crypto_alg_sem);
432
433 list_for_each_entry(q, &crypto_template_list, list) {
434 if (q == tmpl)
435 goto out;
436 }
437
438 list_add(&tmpl->list, &crypto_template_list);
439 crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
440 err = 0;
441out:
442 up_write(&crypto_alg_sem);
443 return err;
444}
445EXPORT_SYMBOL_GPL(crypto_register_template);
446
447void crypto_unregister_template(struct crypto_template *tmpl)
448{
449 struct crypto_instance *inst;
450 struct hlist_node *n;
451 struct hlist_head *list;
452 LIST_HEAD(users);
453
454 down_write(&crypto_alg_sem);
455
456 BUG_ON(list_empty(&tmpl->list));
457 list_del_init(&tmpl->list);
458
459 list = &tmpl->instances;
460 hlist_for_each_entry(inst, list, list) {
461 int err = crypto_remove_alg(&inst->alg, &users);
462 BUG_ON(err);
463 }
464
465 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
466
467 up_write(&crypto_alg_sem);
468
469 hlist_for_each_entry_safe(inst, n, list, list) {
470 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
471 tmpl->free(inst);
472 }
473 crypto_remove_final(&users);
474}
475EXPORT_SYMBOL_GPL(crypto_unregister_template);
476
477static struct crypto_template *__crypto_lookup_template(const char *name)
478{
479 struct crypto_template *q, *tmpl = NULL;
480
481 down_read(&crypto_alg_sem);
482 list_for_each_entry(q, &crypto_template_list, list) {
483 if (strcmp(q->name, name))
484 continue;
485 if (unlikely(!crypto_tmpl_get(q)))
486 continue;
487
488 tmpl = q;
489 break;
490 }
491 up_read(&crypto_alg_sem);
492
493 return tmpl;
494}
495
496struct crypto_template *crypto_lookup_template(const char *name)
497{
498 return try_then_request_module(__crypto_lookup_template(name), "%s",
499 name);
500}
501EXPORT_SYMBOL_GPL(crypto_lookup_template);
502
503int crypto_register_instance(struct crypto_template *tmpl,
504 struct crypto_instance *inst)
505{
506 struct crypto_larval *larval;
507 int err;
508
509 err = crypto_check_alg(&inst->alg);
510 if (err)
511 goto err;
512
513 inst->alg.cra_module = tmpl->module;
514 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
515
516 down_write(&crypto_alg_sem);
517
518 larval = __crypto_register_alg(&inst->alg);
519 if (IS_ERR(larval))
520 goto unlock;
521
522 hlist_add_head(&inst->list, &tmpl->instances);
523 inst->tmpl = tmpl;
524
525unlock:
526 up_write(&crypto_alg_sem);
527
528 err = PTR_ERR(larval);
529 if (IS_ERR(larval))
530 goto err;
531
532 crypto_wait_for_test(larval);
533 err = 0;
534
535err:
536 return err;
537}
538EXPORT_SYMBOL_GPL(crypto_register_instance);
539
540int crypto_unregister_instance(struct crypto_alg *alg)
541{
542 int err;
543 struct crypto_instance *inst = (void *)alg;
544 struct crypto_template *tmpl = inst->tmpl;
545 LIST_HEAD(users);
546
547 if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
548 return -EINVAL;
549
550 BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
551
552 down_write(&crypto_alg_sem);
553
554 hlist_del_init(&inst->list);
555 err = crypto_remove_alg(alg, &users);
556
557 up_write(&crypto_alg_sem);
558
559 if (err)
560 return err;
561
562 tmpl->free(inst);
563 crypto_remove_final(&users);
564
565 return 0;
566}
567EXPORT_SYMBOL_GPL(crypto_unregister_instance);
568
569int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
570 struct crypto_instance *inst, u32 mask)
571{
572 int err = -EAGAIN;
573
574 spawn->inst = inst;
575 spawn->mask = mask;
576
577 down_write(&crypto_alg_sem);
578 if (!crypto_is_moribund(alg)) {
579 list_add(&spawn->list, &alg->cra_users);
580 spawn->alg = alg;
581 err = 0;
582 }
583 up_write(&crypto_alg_sem);
584
585 return err;
586}
587EXPORT_SYMBOL_GPL(crypto_init_spawn);
588
589int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
590 struct crypto_instance *inst,
591 const struct crypto_type *frontend)
592{
593 int err = -EINVAL;
594
595 if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
596 goto out;
597
598 spawn->frontend = frontend;
599 err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
600
601out:
602 return err;
603}
604EXPORT_SYMBOL_GPL(crypto_init_spawn2);
605
606void crypto_drop_spawn(struct crypto_spawn *spawn)
607{
608 if (!spawn->alg)
609 return;
610
611 down_write(&crypto_alg_sem);
612 list_del(&spawn->list);
613 up_write(&crypto_alg_sem);
614}
615EXPORT_SYMBOL_GPL(crypto_drop_spawn);
616
617static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
618{
619 struct crypto_alg *alg;
620 struct crypto_alg *alg2;
621
622 down_read(&crypto_alg_sem);
623 alg = spawn->alg;
624 alg2 = alg;
625 if (alg2)
626 alg2 = crypto_mod_get(alg2);
627 up_read(&crypto_alg_sem);
628
629 if (!alg2) {
630 if (alg)
631 crypto_shoot_alg(alg);
632 return ERR_PTR(-EAGAIN);
633 }
634
635 return alg;
636}
637
638struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
639 u32 mask)
640{
641 struct crypto_alg *alg;
642 struct crypto_tfm *tfm;
643
644 alg = crypto_spawn_alg(spawn);
645 if (IS_ERR(alg))
646 return ERR_CAST(alg);
647
648 tfm = ERR_PTR(-EINVAL);
649 if (unlikely((alg->cra_flags ^ type) & mask))
650 goto out_put_alg;
651
652 tfm = __crypto_alloc_tfm(alg, type, mask);
653 if (IS_ERR(tfm))
654 goto out_put_alg;
655
656 return tfm;
657
658out_put_alg:
659 crypto_mod_put(alg);
660 return tfm;
661}
662EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
663
664void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
665{
666 struct crypto_alg *alg;
667 struct crypto_tfm *tfm;
668
669 alg = crypto_spawn_alg(spawn);
670 if (IS_ERR(alg))
671 return ERR_CAST(alg);
672
673 tfm = crypto_create_tfm(alg, spawn->frontend);
674 if (IS_ERR(tfm))
675 goto out_put_alg;
676
677 return tfm;
678
679out_put_alg:
680 crypto_mod_put(alg);
681 return tfm;
682}
683EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
684
685int crypto_register_notifier(struct notifier_block *nb)
686{
687 return blocking_notifier_chain_register(&crypto_chain, nb);
688}
689EXPORT_SYMBOL_GPL(crypto_register_notifier);
690
691int crypto_unregister_notifier(struct notifier_block *nb)
692{
693 return blocking_notifier_chain_unregister(&crypto_chain, nb);
694}
695EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
696
697struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
698{
699 struct rtattr *rta = tb[0];
700 struct crypto_attr_type *algt;
701
702 if (!rta)
703 return ERR_PTR(-ENOENT);
704 if (RTA_PAYLOAD(rta) < sizeof(*algt))
705 return ERR_PTR(-EINVAL);
706 if (rta->rta_type != CRYPTOA_TYPE)
707 return ERR_PTR(-EINVAL);
708
709 algt = RTA_DATA(rta);
710
711 return algt;
712}
713EXPORT_SYMBOL_GPL(crypto_get_attr_type);
714
715int crypto_check_attr_type(struct rtattr **tb, u32 type)
716{
717 struct crypto_attr_type *algt;
718
719 algt = crypto_get_attr_type(tb);
720 if (IS_ERR(algt))
721 return PTR_ERR(algt);
722
723 if ((algt->type ^ type) & algt->mask)
724 return -EINVAL;
725
726 return 0;
727}
728EXPORT_SYMBOL_GPL(crypto_check_attr_type);
729
730const char *crypto_attr_alg_name(struct rtattr *rta)
731{
732 struct crypto_attr_alg *alga;
733
734 if (!rta)
735 return ERR_PTR(-ENOENT);
736 if (RTA_PAYLOAD(rta) < sizeof(*alga))
737 return ERR_PTR(-EINVAL);
738 if (rta->rta_type != CRYPTOA_ALG)
739 return ERR_PTR(-EINVAL);
740
741 alga = RTA_DATA(rta);
742 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
743
744 return alga->name;
745}
746EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
747
748struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
749 const struct crypto_type *frontend,
750 u32 type, u32 mask)
751{
752 const char *name;
753
754 name = crypto_attr_alg_name(rta);
755 if (IS_ERR(name))
756 return ERR_CAST(name);
757
758 return crypto_find_alg(name, frontend, type, mask);
759}
760EXPORT_SYMBOL_GPL(crypto_attr_alg2);
761
762int crypto_attr_u32(struct rtattr *rta, u32 *num)
763{
764 struct crypto_attr_u32 *nu32;
765
766 if (!rta)
767 return -ENOENT;
768 if (RTA_PAYLOAD(rta) < sizeof(*nu32))
769 return -EINVAL;
770 if (rta->rta_type != CRYPTOA_U32)
771 return -EINVAL;
772
773 nu32 = RTA_DATA(rta);
774 *num = nu32->num;
775
776 return 0;
777}
778EXPORT_SYMBOL_GPL(crypto_attr_u32);
779
780void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
781 unsigned int head)
782{
783 struct crypto_instance *inst;
784 char *p;
785 int err;
786
787 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
788 GFP_KERNEL);
789 if (!p)
790 return ERR_PTR(-ENOMEM);
791
792 inst = (void *)(p + head);
793
794 err = -ENAMETOOLONG;
795 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
796 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
797 goto err_free_inst;
798
799 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
800 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
801 goto err_free_inst;
802
803 return p;
804
805err_free_inst:
806 kfree(p);
807 return ERR_PTR(err);
808}
809EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
810
811struct crypto_instance *crypto_alloc_instance(const char *name,
812 struct crypto_alg *alg)
813{
814 struct crypto_instance *inst;
815 struct crypto_spawn *spawn;
816 int err;
817
818 inst = crypto_alloc_instance2(name, alg, 0);
819 if (IS_ERR(inst))
820 goto out;
821
822 spawn = crypto_instance_ctx(inst);
823 err = crypto_init_spawn(spawn, alg, inst,
824 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
825
826 if (err)
827 goto err_free_inst;
828
829 return inst;
830
831err_free_inst:
832 kfree(inst);
833 inst = ERR_PTR(err);
834
835out:
836 return inst;
837}
838EXPORT_SYMBOL_GPL(crypto_alloc_instance);
839
840void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
841{
842 INIT_LIST_HEAD(&queue->list);
843 queue->backlog = &queue->list;
844 queue->qlen = 0;
845 queue->max_qlen = max_qlen;
846}
847EXPORT_SYMBOL_GPL(crypto_init_queue);
848
849int crypto_enqueue_request(struct crypto_queue *queue,
850 struct crypto_async_request *request)
851{
852 int err = -EINPROGRESS;
853
854 if (unlikely(queue->qlen >= queue->max_qlen)) {
855 err = -EBUSY;
856 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
857 goto out;
858 if (queue->backlog == &queue->list)
859 queue->backlog = &request->list;
860 }
861
862 queue->qlen++;
863 list_add_tail(&request->list, &queue->list);
864
865out:
866 return err;
867}
868EXPORT_SYMBOL_GPL(crypto_enqueue_request);
869
870void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
871{
872 struct list_head *request;
873
874 if (unlikely(!queue->qlen))
875 return NULL;
876
877 queue->qlen--;
878
879 if (queue->backlog != &queue->list)
880 queue->backlog = queue->backlog->next;
881
882 request = queue->list.next;
883 list_del(request);
884
885 return (char *)list_entry(request, struct crypto_async_request, list) -
886 offset;
887}
888EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
889
890struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
891{
892 return __crypto_dequeue_request(queue, 0);
893}
894EXPORT_SYMBOL_GPL(crypto_dequeue_request);
895
896int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
897{
898 struct crypto_async_request *req;
899
900 list_for_each_entry(req, &queue->list, list) {
901 if (req->tfm == tfm)
902 return 1;
903 }
904
905 return 0;
906}
907EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
908
909static inline void crypto_inc_byte(u8 *a, unsigned int size)
910{
911 u8 *b = (a + size);
912 u8 c;
913
914 for (; size; size--) {
915 c = *--b + 1;
916 *b = c;
917 if (c)
918 break;
919 }
920}
921
922void crypto_inc(u8 *a, unsigned int size)
923{
924 __be32 *b = (__be32 *)(a + size);
925 u32 c;
926
927 for (; size >= 4; size -= 4) {
928 c = be32_to_cpu(*--b) + 1;
929 *b = cpu_to_be32(c);
930 if (c)
931 return;
932 }
933
934 crypto_inc_byte(a, size);
935}
936EXPORT_SYMBOL_GPL(crypto_inc);
937
938static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
939{
940 for (; size; size--)
941 *a++ ^= *b++;
942}
943
944void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
945{
946 u32 *a = (u32 *)dst;
947 u32 *b = (u32 *)src;
948
949 for (; size >= 4; size -= 4)
950 *a++ ^= *b++;
951
952 crypto_xor_byte((u8 *)a, (u8 *)b, size);
953}
954EXPORT_SYMBOL_GPL(crypto_xor);
955
956static int __init crypto_algapi_init(void)
957{
958 crypto_init_proc();
959 return 0;
960}
961
962static void __exit crypto_algapi_exit(void)
963{
964 crypto_exit_proc();
965}
966
967module_init(crypto_algapi_init);
968module_exit(crypto_algapi_exit);
969
970MODULE_LICENSE("GPL");
971MODULE_DESCRIPTION("Cryptographic algorithms API");