crypto/algapi.c

   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 <linux/err.h>
  10 #include <linux/errno.h>
  11 #include <linux/fips.h>
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/list.h>
  15 #include <linux/module.h>
  16 #include <linux/rtnetlink.h>
  17 #include <linux/slab.h>
  18 #include <linux/string.h>
  19
  20 #include "internal.h"
  21
  22 static LIST_HEAD(crypto_template_list);
  23
  24 static inline void crypto_check_module_sig(struct module *mod)
  25 {
  26         if (fips_enabled && mod && !module_sig_ok(mod))
  27                 panic("Module %s signature verification failed in FIPS mode\n",
  28                       module_name(mod));
  29 }
  30
  31 static int crypto_check_alg(struct crypto_alg *alg)
  32 {
  33         crypto_check_module_sig(alg->cra_module);
  34
  35         if (!alg->cra_name[0] || !alg->cra_driver_name[0])
  36                 return -EINVAL;
  37
  38         if (alg->cra_alignmask & (alg->cra_alignmask + 1))
  39                 return -EINVAL;
  40
  41         /* General maximums for all algs. */
  42         if (alg->cra_alignmask > MAX_ALGAPI_ALIGNMASK)
  43                 return -EINVAL;
  44
  45         if (alg->cra_blocksize > MAX_ALGAPI_BLOCKSIZE)
  46                 return -EINVAL;
  47
  48         /* Lower maximums for specific alg types. */
  49         if (!alg->cra_type && (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
  50                                CRYPTO_ALG_TYPE_CIPHER) {
  51                 if (alg->cra_alignmask > MAX_CIPHER_ALIGNMASK)
  52                         return -EINVAL;
  53
  54                 if (alg->cra_blocksize > MAX_CIPHER_BLOCKSIZE)
  55                         return -EINVAL;
  56         }
  57
  58         if (alg->cra_priority < 0)
  59                 return -EINVAL;
  60
  61         refcount_set(&alg->cra_refcnt, 1);
  62
  63         return 0;
  64 }
  65
  66 static void crypto_free_instance(struct crypto_instance *inst)
  67 {
  68         if (!inst->alg.cra_type->free) {
  69                 inst->tmpl->free(inst);
  70                 return;
  71         }
  72
  73         inst->alg.cra_type->free(inst);
  74 }
  75
  76 static 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         crypto_free_instance(inst);
  82         crypto_tmpl_put(tmpl);
  83 }
  84
  85 /*
  86  * This function adds a spawn to the list secondary_spawns which
  87  * will be used at the end of crypto_remove_spawns to unregister
  88  * instances, unless the spawn happens to be one that is depended
  89  * on by the new algorithm (nalg in crypto_remove_spawns).
  90  *
  91  * This function is also responsible for resurrecting any algorithms
  92  * in the dependency chain of nalg by unsetting n->dead.
  93  */
  94 static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
  95                                             struct list_head *stack,
  96                                             struct list_head *top,
  97                                             struct list_head *secondary_spawns)
  98 {
  99         struct crypto_spawn *spawn, *n;
 100
 101         spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
 102         if (!spawn)
 103                 return NULL;
 104
 105         n = list_prev_entry(spawn, list);
 106         list_move(&spawn->list, secondary_spawns);
 107
 108         if (list_is_last(&n->list, stack))
 109                 return top;
 110
 111         n = list_next_entry(n, list);
 112         if (!spawn->dead)
 113                 n->dead = false;
 114
 115         return &n->inst->alg.cra_users;
 116 }
 117
 118 static void crypto_remove_instance(struct crypto_instance *inst,
 119                                    struct list_head *list)
 120 {
 121         struct crypto_template *tmpl = inst->tmpl;
 122
 123         if (crypto_is_dead(&inst->alg))
 124                 return;
 125
 126         inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
 127
 128         if (!tmpl || !crypto_tmpl_get(tmpl))
 129                 return;
 130
 131         list_move(&inst->alg.cra_list, list);
 132         hlist_del(&inst->list);
 133         inst->alg.cra_destroy = crypto_destroy_instance;
 134
 135         BUG_ON(!list_empty(&inst->alg.cra_users));
 136 }
 137
 138 /*
 139  * Given an algorithm alg, remove all algorithms that depend on it
 140  * through spawns.  If nalg is not null, then exempt any algorithms
 141  * that is depended on by nalg.  This is useful when nalg itself
 142  * depends on alg.
 143  */
 144 void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
 145                           struct crypto_alg *nalg)
 146 {
 147         u32 new_type = (nalg ?: alg)->cra_flags;
 148         struct crypto_spawn *spawn, *n;
 149         LIST_HEAD(secondary_spawns);
 150         struct list_head *spawns;
 151         LIST_HEAD(stack);
 152         LIST_HEAD(top);
 153
 154         spawns = &alg->cra_users;
 155         list_for_each_entry_safe(spawn, n, spawns, list) {
 156                 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
 157                         continue;
 158
 159                 list_move(&spawn->list, &top);
 160         }
 161
 162         /*
 163          * Perform a depth-first walk starting from alg through
 164          * the cra_users tree.  The list stack records the path
 165          * from alg to the current spawn.
 166          */
 167         spawns = &top;
 168         do {
 169                 while (!list_empty(spawns)) {
 170                         struct crypto_instance *inst;
 171
 172                         spawn = list_first_entry(spawns, struct crypto_spawn,
 173                                                  list);
 174                         inst = spawn->inst;
 175
 176                         list_move(&spawn->list, &stack);
 177                         spawn->dead = !spawn->registered || &inst->alg != nalg;
 178
 179                         if (!spawn->registered)
 180                                 break;
 181
 182                         BUG_ON(&inst->alg == alg);
 183
 184                         if (&inst->alg == nalg)
 185                                 break;
 186
 187                         spawns = &inst->alg.cra_users;
 188
 189                         /*
 190                          * Even if spawn->registered is true, the
 191                          * instance itself may still be unregistered.
 192                          * This is because it may have failed during
 193                          * registration.  Therefore we still need to
 194                          * make the following test.
 195                          *
 196                          * We may encounter an unregistered instance here, since
 197                          * an instance's spawns are set up prior to the instance
 198                          * being registered.  An unregistered instance will have
 199                          * NULL ->cra_users.next, since ->cra_users isn't
 200                          * properly initialized until registration.  But an
 201                          * unregistered instance cannot have any users, so treat
 202                          * it the same as ->cra_users being empty.
 203                          */
 204                         if (spawns->next == NULL)
 205                                 break;
 206                 }
 207         } while ((spawns = crypto_more_spawns(alg, &stack, &top,
 208                                               &secondary_spawns)));
 209
 210         /*
 211          * Remove all instances that are marked as dead.  Also
 212          * complete the resurrection of the others by moving them
 213          * back to the cra_users list.
 214          */
 215         list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
 216                 if (!spawn->dead)
 217                         list_move(&spawn->list, &spawn->alg->cra_users);
 218                 else if (spawn->registered)
 219                         crypto_remove_instance(spawn->inst, list);
 220         }
 221 }
 222 EXPORT_SYMBOL_GPL(crypto_remove_spawns);
 223
 224 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
 225 {
 226         struct crypto_alg *q;
 227         struct crypto_larval *larval;
 228         int ret = -EAGAIN;
 229
 230         if (crypto_is_dead(alg))
 231                 goto err;
 232
 233         INIT_LIST_HEAD(&alg->cra_users);
 234
 235         /* No cheating! */
 236         alg->cra_flags &= ~CRYPTO_ALG_TESTED;
 237
 238         ret = -EEXIST;
 239
 240         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 241                 if (q == alg)
 242                         goto err;
 243
 244                 if (crypto_is_moribund(q))
 245                         continue;
 246
 247                 if (crypto_is_larval(q)) {
 248                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
 249                                 goto err;
 250                         continue;
 251                 }
 252
 253                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
 254                     !strcmp(q->cra_name, alg->cra_driver_name))
 255                         goto err;
 256         }
 257
 258         larval = crypto_larval_alloc(alg->cra_name,
 259                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
 260         if (IS_ERR(larval))
 261                 goto out;
 262
 263         ret = -ENOENT;
 264         larval->adult = crypto_mod_get(alg);
 265         if (!larval->adult)
 266                 goto free_larval;
 267
 268         refcount_set(&larval->alg.cra_refcnt, 1);
 269         memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
 270                CRYPTO_MAX_ALG_NAME);
 271         larval->alg.cra_priority = alg->cra_priority;
 272
 273         list_add(&alg->cra_list, &crypto_alg_list);
 274         list_add(&larval->alg.cra_list, &crypto_alg_list);
 275
 276         crypto_stats_init(alg);
 277
 278 out:
 279         return larval;
 280
 281 free_larval:
 282         kfree(larval);
 283 err:
 284         larval = ERR_PTR(ret);
 285         goto out;
 286 }
 287
 288 void crypto_alg_tested(const char *name, int err)
 289 {
 290         struct crypto_larval *test;
 291         struct crypto_alg *alg;
 292         struct crypto_alg *q;
 293         LIST_HEAD(list);
 294         bool best;
 295
 296         down_write(&crypto_alg_sem);
 297         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 298                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
 299                         continue;
 300
 301                 test = (struct crypto_larval *)q;
 302
 303                 if (!strcmp(q->cra_driver_name, name))
 304                         goto found;
 305         }
 306
 307         pr_err("alg: Unexpected test result for %s: %d\n", name, err);
 308         goto unlock;
 309
 310 found:
 311         q->cra_flags |= CRYPTO_ALG_DEAD;
 312         alg = test->adult;
 313         if (err || list_empty(&alg->cra_list))
 314                 goto complete;
 315
 316         alg->cra_flags |= CRYPTO_ALG_TESTED;
 317
 318         /* Only satisfy larval waiters if we are the best. */
 319         best = true;
 320         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 321                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
 322                         continue;
 323
 324                 if (strcmp(alg->cra_name, q->cra_name))
 325                         continue;
 326
 327                 if (q->cra_priority > alg->cra_priority) {
 328                         best = false;
 329                         break;
 330                 }
 331         }
 332
 333         list_for_each_entry(q, &crypto_alg_list, cra_list) {
 334                 if (q == alg)
 335                         continue;
 336
 337                 if (crypto_is_moribund(q))
 338                         continue;
 339
 340                 if (crypto_is_larval(q)) {
 341                         struct crypto_larval *larval = (void *)q;
 342
 343                         /*
 344                          * Check to see if either our generic name or
 345                          * specific name can satisfy the name requested
 346                          * by the larval entry q.
 347                          */
 348                         if (strcmp(alg->cra_name, q->cra_name) &&
 349                             strcmp(alg->cra_driver_name, q->cra_name))
 350                                 continue;
 351
 352                         if (larval->adult)
 353                                 continue;
 354                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
 355                                 continue;
 356
 357                         if (best && crypto_mod_get(alg))
 358                                 larval->adult = alg;
 359                         else
 360                                 larval->adult = ERR_PTR(-EAGAIN);
 361
 362                         continue;
 363                 }
 364
 365                 if (strcmp(alg->cra_name, q->cra_name))
 366                         continue;
 367
 368                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
 369                     q->cra_priority > alg->cra_priority)
 370                         continue;
 371
 372                 crypto_remove_spawns(q, &list, alg);
 373         }
 374
 375 complete:
 376         complete_all(&test->completion);
 377
 378 unlock:
 379         up_write(&crypto_alg_sem);
 380
 381         crypto_remove_final(&list);
 382 }
 383 EXPORT_SYMBOL_GPL(crypto_alg_tested);
 384
 385 void crypto_remove_final(struct list_head *list)
 386 {
 387         struct crypto_alg *alg;
 388         struct crypto_alg *n;
 389
 390         list_for_each_entry_safe(alg, n, list, cra_list) {
 391                 list_del_init(&alg->cra_list);
 392                 crypto_alg_put(alg);
 393         }
 394 }
 395 EXPORT_SYMBOL_GPL(crypto_remove_final);
 396
 397 static void crypto_wait_for_test(struct crypto_larval *larval)
 398 {
 399         int err;
 400
 401         err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
 402         if (err != NOTIFY_STOP) {
 403                 if (WARN_ON(err != NOTIFY_DONE))
 404                         goto out;
 405                 crypto_alg_tested(larval->alg.cra_driver_name, 0);
 406         }
 407
 408         err = wait_for_completion_killable(&larval->completion);
 409         WARN_ON(err);
 410         if (!err)
 411                 crypto_probing_notify(CRYPTO_MSG_ALG_LOADED, larval);
 412
 413 out:
 414         crypto_larval_kill(&larval->alg);
 415 }
 416
 417 int crypto_register_alg(struct crypto_alg *alg)
 418 {
 419         struct crypto_larval *larval;
 420         int err;
 421
 422         alg->cra_flags &= ~CRYPTO_ALG_DEAD;
 423         err = crypto_check_alg(alg);
 424         if (err)
 425                 return err;
 426
 427         down_write(&crypto_alg_sem);
 428         larval = __crypto_register_alg(alg);
 429         up_write(&crypto_alg_sem);
 430
 431         if (IS_ERR(larval))
 432                 return PTR_ERR(larval);
 433
 434         crypto_wait_for_test(larval);
 435         return 0;
 436 }
 437 EXPORT_SYMBOL_GPL(crypto_register_alg);
 438
 439 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
 440 {
 441         if (unlikely(list_empty(&alg->cra_list)))
 442                 return -ENOENT;
 443
 444         alg->cra_flags |= CRYPTO_ALG_DEAD;
 445
 446         list_del_init(&alg->cra_list);
 447         crypto_remove_spawns(alg, list, NULL);
 448
 449         return 0;
 450 }
 451
 452 void crypto_unregister_alg(struct crypto_alg *alg)
 453 {
 454         int ret;
 455         LIST_HEAD(list);
 456
 457         down_write(&crypto_alg_sem);
 458         ret = crypto_remove_alg(alg, &list);
 459         up_write(&crypto_alg_sem);
 460
 461         if (WARN(ret, "Algorithm %s is not registered", alg->cra_driver_name))
 462                 return;
 463
 464         BUG_ON(refcount_read(&alg->cra_refcnt) != 1);
 465         if (alg->cra_destroy)
 466                 alg->cra_destroy(alg);
 467
 468         crypto_remove_final(&list);
 469 }
 470 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
 471
 472 int crypto_register_algs(struct crypto_alg *algs, int count)
 473 {
 474         int i, ret;
 475
 476         for (i = 0; i < count; i++) {
 477                 ret = crypto_register_alg(&algs[i]);
 478                 if (ret)
 479                         goto err;
 480         }
 481
 482         return 0;
 483
 484 err:
 485         for (--i; i >= 0; --i)
 486                 crypto_unregister_alg(&algs[i]);
 487
 488         return ret;
 489 }
 490 EXPORT_SYMBOL_GPL(crypto_register_algs);
 491
 492 void crypto_unregister_algs(struct crypto_alg *algs, int count)
 493 {
 494         int i;
 495
 496         for (i = 0; i < count; i++)
 497                 crypto_unregister_alg(&algs[i]);
 498 }
 499 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
 500
 501 int crypto_register_template(struct crypto_template *tmpl)
 502 {
 503         struct crypto_template *q;
 504         int err = -EEXIST;
 505
 506         down_write(&crypto_alg_sem);
 507
 508         crypto_check_module_sig(tmpl->module);
 509
 510         list_for_each_entry(q, &crypto_template_list, list) {
 511                 if (q == tmpl)
 512                         goto out;
 513         }
 514
 515         list_add(&tmpl->list, &crypto_template_list);
 516         err = 0;
 517 out:
 518         up_write(&crypto_alg_sem);
 519         return err;
 520 }
 521 EXPORT_SYMBOL_GPL(crypto_register_template);
 522
 523 int crypto_register_templates(struct crypto_template *tmpls, int count)
 524 {
 525         int i, err;
 526
 527         for (i = 0; i < count; i++) {
 528                 err = crypto_register_template(&tmpls[i]);
 529                 if (err)
 530                         goto out;
 531         }
 532         return 0;
 533
 534 out:
 535         for (--i; i >= 0; --i)
 536                 crypto_unregister_template(&tmpls[i]);
 537         return err;
 538 }
 539 EXPORT_SYMBOL_GPL(crypto_register_templates);
 540
 541 void crypto_unregister_template(struct crypto_template *tmpl)
 542 {
 543         struct crypto_instance *inst;
 544         struct hlist_node *n;
 545         struct hlist_head *list;
 546         LIST_HEAD(users);
 547
 548         down_write(&crypto_alg_sem);
 549
 550         BUG_ON(list_empty(&tmpl->list));
 551         list_del_init(&tmpl->list);
 552
 553         list = &tmpl->instances;
 554         hlist_for_each_entry(inst, list, list) {
 555                 int err = crypto_remove_alg(&inst->alg, &users);
 556
 557                 BUG_ON(err);
 558         }
 559
 560         up_write(&crypto_alg_sem);
 561
 562         hlist_for_each_entry_safe(inst, n, list, list) {
 563                 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
 564                 crypto_free_instance(inst);
 565         }
 566         crypto_remove_final(&users);
 567 }
 568 EXPORT_SYMBOL_GPL(crypto_unregister_template);
 569
 570 void crypto_unregister_templates(struct crypto_template *tmpls, int count)
 571 {
 572         int i;
 573
 574         for (i = count - 1; i >= 0; --i)
 575                 crypto_unregister_template(&tmpls[i]);
 576 }
 577 EXPORT_SYMBOL_GPL(crypto_unregister_templates);
 578
 579 static struct crypto_template *__crypto_lookup_template(const char *name)
 580 {
 581         struct crypto_template *q, *tmpl = NULL;
 582
 583         down_read(&crypto_alg_sem);
 584         list_for_each_entry(q, &crypto_template_list, list) {
 585                 if (strcmp(q->name, name))
 586                         continue;
 587                 if (unlikely(!crypto_tmpl_get(q)))
 588                         continue;
 589
 590                 tmpl = q;
 591                 break;
 592         }
 593         up_read(&crypto_alg_sem);
 594
 595         return tmpl;
 596 }
 597
 598 struct crypto_template *crypto_lookup_template(const char *name)
 599 {
 600         return try_then_request_module(__crypto_lookup_template(name),
 601                                        "crypto-%s", name);
 602 }
 603 EXPORT_SYMBOL_GPL(crypto_lookup_template);
 604
 605 int crypto_register_instance(struct crypto_template *tmpl,
 606                              struct crypto_instance *inst)
 607 {
 608         struct crypto_larval *larval;
 609         struct crypto_spawn *spawn;
 610         int err;
 611
 612         err = crypto_check_alg(&inst->alg);
 613         if (err)
 614                 return err;
 615
 616         inst->alg.cra_module = tmpl->module;
 617         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 618
 619         down_write(&crypto_alg_sem);
 620
 621         larval = ERR_PTR(-EAGAIN);
 622         for (spawn = inst->spawns; spawn;) {
 623                 struct crypto_spawn *next;
 624
 625                 if (spawn->dead)
 626                         goto unlock;
 627
 628                 next = spawn->next;
 629                 spawn->inst = inst;
 630                 spawn->registered = true;
 631
 632                 if (spawn->dropref)
 633                         crypto_mod_put(spawn->alg);
 634
 635                 spawn = next;
 636         }
 637
 638         larval = __crypto_register_alg(&inst->alg);
 639         if (IS_ERR(larval))
 640                 goto unlock;
 641
 642         hlist_add_head(&inst->list, &tmpl->instances);
 643         inst->tmpl = tmpl;
 644
 645 unlock:
 646         up_write(&crypto_alg_sem);
 647
 648         err = PTR_ERR(larval);
 649         if (IS_ERR(larval))
 650                 goto err;
 651
 652         crypto_wait_for_test(larval);
 653         err = 0;
 654
 655 err:
 656         return err;
 657 }
 658 EXPORT_SYMBOL_GPL(crypto_register_instance);
 659
 660 void crypto_unregister_instance(struct crypto_instance *inst)
 661 {
 662         LIST_HEAD(list);
 663
 664         down_write(&crypto_alg_sem);
 665
 666         crypto_remove_spawns(&inst->alg, &list, NULL);
 667         crypto_remove_instance(inst, &list);
 668
 669         up_write(&crypto_alg_sem);
 670
 671         crypto_remove_final(&list);
 672 }
 673 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
 674
 675 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 676                       struct crypto_instance *inst, u32 mask)
 677 {
 678         int err = -EAGAIN;
 679
 680         if (WARN_ON_ONCE(inst == NULL))
 681                 return -EINVAL;
 682
 683         spawn->next = inst->spawns;
 684         inst->spawns = spawn;
 685
 686         spawn->mask = mask;
 687
 688         down_write(&crypto_alg_sem);
 689         if (!crypto_is_moribund(alg)) {
 690                 list_add(&spawn->list, &alg->cra_users);
 691                 spawn->alg = alg;
 692                 err = 0;
 693         }
 694         up_write(&crypto_alg_sem);
 695
 696         return err;
 697 }
 698 EXPORT_SYMBOL_GPL(crypto_init_spawn);
 699
 700 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 701                        struct crypto_instance *inst,
 702                        const struct crypto_type *frontend)
 703 {
 704         int err = -EINVAL;
 705
 706         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
 707                 goto out;
 708
 709         spawn->frontend = frontend;
 710         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
 711
 712 out:
 713         return err;
 714 }
 715 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 716
 717 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
 718                       u32 type, u32 mask)
 719 {
 720         struct crypto_alg *alg;
 721         int err;
 722
 723         alg = crypto_find_alg(name, spawn->frontend, type, mask);
 724         if (IS_ERR(alg))
 725                 return PTR_ERR(alg);
 726
 727         spawn->dropref = true;
 728         err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
 729         if (err)
 730                 crypto_mod_put(alg);
 731         return err;
 732 }
 733 EXPORT_SYMBOL_GPL(crypto_grab_spawn);
 734
 735 void crypto_drop_spawn(struct crypto_spawn *spawn)
 736 {
 737         if (!spawn->alg) /* not yet initialized? */
 738                 return;
 739
 740         down_write(&crypto_alg_sem);
 741         if (!spawn->dead)
 742                 list_del(&spawn->list);
 743         up_write(&crypto_alg_sem);
 744
 745         if (spawn->dropref && !spawn->registered)
 746                 crypto_mod_put(spawn->alg);
 747 }
 748 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
 749
 750 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
 751 {
 752         struct crypto_alg *alg;
 753
 754         down_read(&crypto_alg_sem);
 755         alg = spawn->alg;
 756         if (!spawn->dead && !crypto_mod_get(alg)) {
 757                 alg->cra_flags |= CRYPTO_ALG_DYING;
 758                 alg = NULL;
 759         }
 760         up_read(&crypto_alg_sem);
 761
 762         return alg ?: ERR_PTR(-EAGAIN);
 763 }
 764
 765 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 766                                     u32 mask)
 767 {
 768         struct crypto_alg *alg;
 769         struct crypto_tfm *tfm;
 770
 771         alg = crypto_spawn_alg(spawn);
 772         if (IS_ERR(alg))
 773                 return ERR_CAST(alg);
 774
 775         tfm = ERR_PTR(-EINVAL);
 776         if (unlikely((alg->cra_flags ^ type) & mask))
 777                 goto out_put_alg;
 778
 779         tfm = __crypto_alloc_tfm(alg, type, mask);
 780         if (IS_ERR(tfm))
 781                 goto out_put_alg;
 782
 783         return tfm;
 784
 785 out_put_alg:
 786         crypto_mod_put(alg);
 787         return tfm;
 788 }
 789 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
 790
 791 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
 792 {
 793         struct crypto_alg *alg;
 794         struct crypto_tfm *tfm;
 795
 796         alg = crypto_spawn_alg(spawn);
 797         if (IS_ERR(alg))
 798                 return ERR_CAST(alg);
 799
 800         tfm = crypto_create_tfm(alg, spawn->frontend);
 801         if (IS_ERR(tfm))
 802                 goto out_put_alg;
 803
 804         return tfm;
 805
 806 out_put_alg:
 807         crypto_mod_put(alg);
 808         return tfm;
 809 }
 810 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 811
 812 int crypto_register_notifier(struct notifier_block *nb)
 813 {
 814         return blocking_notifier_chain_register(&crypto_chain, nb);
 815 }
 816 EXPORT_SYMBOL_GPL(crypto_register_notifier);
 817
 818 int crypto_unregister_notifier(struct notifier_block *nb)
 819 {
 820         return blocking_notifier_chain_unregister(&crypto_chain, nb);
 821 }
 822 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 823
 824 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 825 {
 826         struct rtattr *rta = tb[0];
 827         struct crypto_attr_type *algt;
 828
 829         if (!rta)
 830                 return ERR_PTR(-ENOENT);
 831         if (RTA_PAYLOAD(rta) < sizeof(*algt))
 832                 return ERR_PTR(-EINVAL);
 833         if (rta->rta_type != CRYPTOA_TYPE)
 834                 return ERR_PTR(-EINVAL);
 835
 836         algt = RTA_DATA(rta);
 837
 838         return algt;
 839 }
 840 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
 841
 842 int crypto_check_attr_type(struct rtattr **tb, u32 type)
 843 {
 844         struct crypto_attr_type *algt;
 845
 846         algt = crypto_get_attr_type(tb);
 847         if (IS_ERR(algt))
 848                 return PTR_ERR(algt);
 849
 850         if ((algt->type ^ type) & algt->mask)
 851                 return -EINVAL;
 852
 853         return 0;
 854 }
 855 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
 856
 857 const char *crypto_attr_alg_name(struct rtattr *rta)
 858 {
 859         struct crypto_attr_alg *alga;
 860
 861         if (!rta)
 862                 return ERR_PTR(-ENOENT);
 863         if (RTA_PAYLOAD(rta) < sizeof(*alga))
 864                 return ERR_PTR(-EINVAL);
 865         if (rta->rta_type != CRYPTOA_ALG)
 866                 return ERR_PTR(-EINVAL);
 867
 868         alga = RTA_DATA(rta);
 869         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
 870
 871         return alga->name;
 872 }
 873 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
 874
 875 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 876                                     const struct crypto_type *frontend,
 877                                     u32 type, u32 mask)
 878 {
 879         const char *name;
 880
 881         name = crypto_attr_alg_name(rta);
 882         if (IS_ERR(name))
 883                 return ERR_CAST(name);
 884
 885         return crypto_find_alg(name, frontend, type, mask);
 886 }
 887 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
 888
 889 int crypto_attr_u32(struct rtattr *rta, u32 *num)
 890 {
 891         struct crypto_attr_u32 *nu32;
 892
 893         if (!rta)
 894                 return -ENOENT;
 895         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
 896                 return -EINVAL;
 897         if (rta->rta_type != CRYPTOA_U32)
 898                 return -EINVAL;
 899
 900         nu32 = RTA_DATA(rta);
 901         *num = nu32->num;
 902
 903         return 0;
 904 }
 905 EXPORT_SYMBOL_GPL(crypto_attr_u32);
 906
 907 int crypto_inst_setname(struct crypto_instance *inst, const char *name,
 908                         struct crypto_alg *alg)
 909 {
 910         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
 911                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
 912                 return -ENAMETOOLONG;
 913
 914         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
 915                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 916                 return -ENAMETOOLONG;
 917
 918         return 0;
 919 }
 920 EXPORT_SYMBOL_GPL(crypto_inst_setname);
 921
 922 void *crypto_alloc_instance(const char *name, struct crypto_alg *alg,
 923                             unsigned int head)
 924 {
 925         struct crypto_instance *inst;
 926         char *p;
 927         int err;
 928
 929         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
 930                     GFP_KERNEL);
 931         if (!p)
 932                 return ERR_PTR(-ENOMEM);
 933
 934         inst = (void *)(p + head);
 935
 936         err = crypto_inst_setname(inst, name, alg);
 937         if (err)
 938                 goto err_free_inst;
 939
 940         return p;
 941
 942 err_free_inst:
 943         kfree(p);
 944         return ERR_PTR(err);
 945 }
 946 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
 947
 948 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
 949 {
 950         INIT_LIST_HEAD(&queue->list);
 951         queue->backlog = &queue->list;
 952         queue->qlen = 0;
 953         queue->max_qlen = max_qlen;
 954 }
 955 EXPORT_SYMBOL_GPL(crypto_init_queue);
 956
 957 int crypto_enqueue_request(struct crypto_queue *queue,
 958                            struct crypto_async_request *request)
 959 {
 960         int err = -EINPROGRESS;
 961
 962         if (unlikely(queue->qlen >= queue->max_qlen)) {
 963                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
 964                         err = -ENOSPC;
 965                         goto out;
 966                 }
 967                 err = -EBUSY;
 968                 if (queue->backlog == &queue->list)
 969                         queue->backlog = &request->list;
 970         }
 971
 972         queue->qlen++;
 973         list_add_tail(&request->list, &queue->list);
 974
 975 out:
 976         return err;
 977 }
 978 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
 979
 980 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
 981 {
 982         struct list_head *request;
 983
 984         if (unlikely(!queue->qlen))
 985                 return NULL;
 986
 987         queue->qlen--;
 988
 989         if (queue->backlog != &queue->list)
 990                 queue->backlog = queue->backlog->next;
 991
 992         request = queue->list.next;
 993         list_del(request);
 994
 995         return list_entry(request, struct crypto_async_request, list);
 996 }
 997 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
 998
 999 static inline void crypto_inc_byte(u8 *a, unsigned int size)
1000 {
1001         u8 *b = (a + size);
1002         u8 c;
1003
1004         for (; size; size--) {
1005                 c = *--b + 1;
1006                 *b = c;
1007                 if (c)
1008                         break;
1009         }
1010 }
1011
1012 void crypto_inc(u8 *a, unsigned int size)
1013 {
1014         __be32 *b = (__be32 *)(a + size);
1015         u32 c;
1016
1017         if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
1018             IS_ALIGNED((unsigned long)b, __alignof__(*b)))
1019                 for (; size >= 4; size -= 4) {
1020                         c = be32_to_cpu(*--b) + 1;
1021                         *b = cpu_to_be32(c);
1022                         if (likely(c))
1023                                 return;
1024                 }
1025
1026         crypto_inc_byte(a, size);
1027 }
1028 EXPORT_SYMBOL_GPL(crypto_inc);
1029
1030 void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len)
1031 {
1032         int relalign = 0;
1033
1034         if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
1035                 int size = sizeof(unsigned long);
1036                 int d = (((unsigned long)dst ^ (unsigned long)src1) |
1037                          ((unsigned long)dst ^ (unsigned long)src2)) &
1038                         (size - 1);
1039
1040                 relalign = d ? 1 << __ffs(d) : size;
1041
1042                 /*
1043                  * If we care about alignment, process as many bytes as
1044                  * needed to advance dst and src to values whose alignments
1045                  * equal their relative alignment. This will allow us to
1046                  * process the remainder of the input using optimal strides.
1047                  */
1048                 while (((unsigned long)dst & (relalign - 1)) && len > 0) {
1049                         *dst++ = *src1++ ^ *src2++;
1050                         len--;
1051                 }
1052         }
1053
1054         while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) {
1055                 *(u64 *)dst = *(u64 *)src1 ^  *(u64 *)src2;
1056                 dst += 8;
1057                 src1 += 8;
1058                 src2 += 8;
1059                 len -= 8;
1060         }
1061
1062         while (len >= 4 && !(relalign & 3)) {
1063                 *(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2;
1064                 dst += 4;
1065                 src1 += 4;
1066                 src2 += 4;
1067                 len -= 4;
1068         }
1069
1070         while (len >= 2 && !(relalign & 1)) {
1071                 *(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2;
1072                 dst += 2;
1073                 src1 += 2;
1074                 src2 += 2;
1075                 len -= 2;
1076         }
1077
1078         while (len--)
1079                 *dst++ = *src1++ ^ *src2++;
1080 }
1081 EXPORT_SYMBOL_GPL(__crypto_xor);
1082
1083 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1084 {
1085         return alg->cra_ctxsize +
1086                (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1087 }
1088 EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1089
1090 int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1091                         u32 type, u32 mask)
1092 {
1093         int ret = 0;
1094         struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1095
1096         if (!IS_ERR(alg)) {
1097                 crypto_mod_put(alg);
1098                 ret = 1;
1099         }
1100
1101         return ret;
1102 }
1103 EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1104
1105 #ifdef CONFIG_CRYPTO_STATS
1106 void crypto_stats_init(struct crypto_alg *alg)
1107 {
1108         memset(&alg->stats, 0, sizeof(alg->stats));
1109 }
1110 EXPORT_SYMBOL_GPL(crypto_stats_init);
1111
1112 void crypto_stats_get(struct crypto_alg *alg)
1113 {
1114         crypto_alg_get(alg);
1115 }
1116 EXPORT_SYMBOL_GPL(crypto_stats_get);
1117
1118 void crypto_stats_aead_encrypt(unsigned int cryptlen, struct crypto_alg *alg,
1119                                int ret)
1120 {
1121         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1122                 atomic64_inc(&alg->stats.aead.err_cnt);
1123         } else {
1124                 atomic64_inc(&alg->stats.aead.encrypt_cnt);
1125                 atomic64_add(cryptlen, &alg->stats.aead.encrypt_tlen);
1126         }
1127         crypto_alg_put(alg);
1128 }
1129 EXPORT_SYMBOL_GPL(crypto_stats_aead_encrypt);
1130
1131 void crypto_stats_aead_decrypt(unsigned int cryptlen, struct crypto_alg *alg,
1132                                int ret)
1133 {
1134         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1135                 atomic64_inc(&alg->stats.aead.err_cnt);
1136         } else {
1137                 atomic64_inc(&alg->stats.aead.decrypt_cnt);
1138                 atomic64_add(cryptlen, &alg->stats.aead.decrypt_tlen);
1139         }
1140         crypto_alg_put(alg);
1141 }
1142 EXPORT_SYMBOL_GPL(crypto_stats_aead_decrypt);
1143
1144 void crypto_stats_akcipher_encrypt(unsigned int src_len, int ret,
1145                                    struct crypto_alg *alg)
1146 {
1147         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1148                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1149         } else {
1150                 atomic64_inc(&alg->stats.akcipher.encrypt_cnt);
1151                 atomic64_add(src_len, &alg->stats.akcipher.encrypt_tlen);
1152         }
1153         crypto_alg_put(alg);
1154 }
1155 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_encrypt);
1156
1157 void crypto_stats_akcipher_decrypt(unsigned int src_len, int ret,
1158                                    struct crypto_alg *alg)
1159 {
1160         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1161                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1162         } else {
1163                 atomic64_inc(&alg->stats.akcipher.decrypt_cnt);
1164                 atomic64_add(src_len, &alg->stats.akcipher.decrypt_tlen);
1165         }
1166         crypto_alg_put(alg);
1167 }
1168 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_decrypt);
1169
1170 void crypto_stats_akcipher_sign(int ret, struct crypto_alg *alg)
1171 {
1172         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1173                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1174         else
1175                 atomic64_inc(&alg->stats.akcipher.sign_cnt);
1176         crypto_alg_put(alg);
1177 }
1178 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_sign);
1179
1180 void crypto_stats_akcipher_verify(int ret, struct crypto_alg *alg)
1181 {
1182         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1183                 atomic64_inc(&alg->stats.akcipher.err_cnt);
1184         else
1185                 atomic64_inc(&alg->stats.akcipher.verify_cnt);
1186         crypto_alg_put(alg);
1187 }
1188 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_verify);
1189
1190 void crypto_stats_compress(unsigned int slen, int ret, struct crypto_alg *alg)
1191 {
1192         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1193                 atomic64_inc(&alg->stats.compress.err_cnt);
1194         } else {
1195                 atomic64_inc(&alg->stats.compress.compress_cnt);
1196                 atomic64_add(slen, &alg->stats.compress.compress_tlen);
1197         }
1198         crypto_alg_put(alg);
1199 }
1200 EXPORT_SYMBOL_GPL(crypto_stats_compress);
1201
1202 void crypto_stats_decompress(unsigned int slen, int ret, struct crypto_alg *alg)
1203 {
1204         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1205                 atomic64_inc(&alg->stats.compress.err_cnt);
1206         } else {
1207                 atomic64_inc(&alg->stats.compress.decompress_cnt);
1208                 atomic64_add(slen, &alg->stats.compress.decompress_tlen);
1209         }
1210         crypto_alg_put(alg);
1211 }
1212 EXPORT_SYMBOL_GPL(crypto_stats_decompress);
1213
1214 void crypto_stats_ahash_update(unsigned int nbytes, int ret,
1215                                struct crypto_alg *alg)
1216 {
1217         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1218                 atomic64_inc(&alg->stats.hash.err_cnt);
1219         else
1220                 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1221         crypto_alg_put(alg);
1222 }
1223 EXPORT_SYMBOL_GPL(crypto_stats_ahash_update);
1224
1225 void crypto_stats_ahash_final(unsigned int nbytes, int ret,
1226                               struct crypto_alg *alg)
1227 {
1228         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1229                 atomic64_inc(&alg->stats.hash.err_cnt);
1230         } else {
1231                 atomic64_inc(&alg->stats.hash.hash_cnt);
1232                 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1233         }
1234         crypto_alg_put(alg);
1235 }
1236 EXPORT_SYMBOL_GPL(crypto_stats_ahash_final);
1237
1238 void crypto_stats_kpp_set_secret(struct crypto_alg *alg, int ret)
1239 {
1240         if (ret)
1241                 atomic64_inc(&alg->stats.kpp.err_cnt);
1242         else
1243                 atomic64_inc(&alg->stats.kpp.setsecret_cnt);
1244         crypto_alg_put(alg);
1245 }
1246 EXPORT_SYMBOL_GPL(crypto_stats_kpp_set_secret);
1247
1248 void crypto_stats_kpp_generate_public_key(struct crypto_alg *alg, int ret)
1249 {
1250         if (ret)
1251                 atomic64_inc(&alg->stats.kpp.err_cnt);
1252         else
1253                 atomic64_inc(&alg->stats.kpp.generate_public_key_cnt);
1254         crypto_alg_put(alg);
1255 }
1256 EXPORT_SYMBOL_GPL(crypto_stats_kpp_generate_public_key);
1257
1258 void crypto_stats_kpp_compute_shared_secret(struct crypto_alg *alg, int ret)
1259 {
1260         if (ret)
1261                 atomic64_inc(&alg->stats.kpp.err_cnt);
1262         else
1263                 atomic64_inc(&alg->stats.kpp.compute_shared_secret_cnt);
1264         crypto_alg_put(alg);
1265 }
1266 EXPORT_SYMBOL_GPL(crypto_stats_kpp_compute_shared_secret);
1267
1268 void crypto_stats_rng_seed(struct crypto_alg *alg, int ret)
1269 {
1270         if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1271                 atomic64_inc(&alg->stats.rng.err_cnt);
1272         else
1273                 atomic64_inc(&alg->stats.rng.seed_cnt);
1274         crypto_alg_put(alg);
1275 }
1276 EXPORT_SYMBOL_GPL(crypto_stats_rng_seed);
1277
1278 void crypto_stats_rng_generate(struct crypto_alg *alg, unsigned int dlen,
1279                                int ret)
1280 {
1281         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1282                 atomic64_inc(&alg->stats.rng.err_cnt);
1283         } else {
1284                 atomic64_inc(&alg->stats.rng.generate_cnt);
1285                 atomic64_add(dlen, &alg->stats.rng.generate_tlen);
1286         }
1287         crypto_alg_put(alg);
1288 }
1289 EXPORT_SYMBOL_GPL(crypto_stats_rng_generate);
1290
1291 void crypto_stats_skcipher_encrypt(unsigned int cryptlen, int ret,
1292                                    struct crypto_alg *alg)
1293 {
1294         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1295                 atomic64_inc(&alg->stats.cipher.err_cnt);
1296         } else {
1297                 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1298                 atomic64_add(cryptlen, &alg->stats.cipher.encrypt_tlen);
1299         }
1300         crypto_alg_put(alg);
1301 }
1302 EXPORT_SYMBOL_GPL(crypto_stats_skcipher_encrypt);
1303
1304 void crypto_stats_skcipher_decrypt(unsigned int cryptlen, int ret,
1305                                    struct crypto_alg *alg)
1306 {
1307         if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1308                 atomic64_inc(&alg->stats.cipher.err_cnt);
1309         } else {
1310                 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1311                 atomic64_add(cryptlen, &alg->stats.cipher.decrypt_tlen);
1312         }
1313         crypto_alg_put(alg);
1314 }
1315 EXPORT_SYMBOL_GPL(crypto_stats_skcipher_decrypt);
1316 #endif
1317
1318 static int __init crypto_algapi_init(void)
1319 {
1320         crypto_init_proc();
1321         return 0;
1322 }
1323
1324 static void __exit crypto_algapi_exit(void)
1325 {
1326         crypto_exit_proc();
1327 }
1328
1329 module_init(crypto_algapi_init);
1330 module_exit(crypto_algapi_exit);
1331
1332 MODULE_LICENSE("GPL");
1333 MODULE_DESCRIPTION("Cryptographic algorithms API");