crypto/cryptd.c

   1 /*
   2  * Software async crypto daemon.
   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 <crypto/algapi.h>
  14 #include <crypto/internal/hash.h>
  15 #include <crypto/cryptd.h>
  16 #include <crypto/crypto_wq.h>
  17 #include <linux/err.h>
  18 #include <linux/init.h>
  19 #include <linux/kernel.h>
  20 #include <linux/list.h>
  21 #include <linux/module.h>
  22 #include <linux/scatterlist.h>
  23 #include <linux/sched.h>
  24 #include <linux/slab.h>
  25
  26 #define CRYPTD_MAX_CPU_QLEN 100
  27
  28 struct cryptd_cpu_queue {
  29         struct crypto_queue queue;
  30         struct work_struct work;
  31 };
  32
  33 struct cryptd_queue {
  34         struct cryptd_cpu_queue *cpu_queue;
  35 };
  36
  37 struct cryptd_instance_ctx {
  38         struct crypto_spawn spawn;
  39         struct cryptd_queue *queue;
  40 };
  41
  42 struct hashd_instance_ctx {
  43         struct crypto_shash_spawn spawn;
  44         struct cryptd_queue *queue;
  45 };
  46
  47 struct cryptd_blkcipher_ctx {
  48         struct crypto_blkcipher *child;
  49 };
  50
  51 struct cryptd_blkcipher_request_ctx {
  52         crypto_completion_t complete;
  53 };
  54
  55 struct cryptd_hash_ctx {
  56         struct crypto_shash *child;
  57 };
  58
  59 struct cryptd_hash_request_ctx {
  60         crypto_completion_t complete;
  61         struct shash_desc desc;
  62 };
  63
  64 static void cryptd_queue_worker(struct work_struct *work);
  65
  66 static int cryptd_init_queue(struct cryptd_queue *queue,
  67                              unsigned int max_cpu_qlen)
  68 {
  69         int cpu;
  70         struct cryptd_cpu_queue *cpu_queue;
  71
  72         queue->cpu_queue = alloc_percpu(struct cryptd_cpu_queue);
  73         if (!queue->cpu_queue)
  74                 return -ENOMEM;
  75         for_each_possible_cpu(cpu) {
  76                 cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
  77                 crypto_init_queue(&cpu_queue->queue, max_cpu_qlen);
  78                 INIT_WORK(&cpu_queue->work, cryptd_queue_worker);
  79         }
  80         return 0;
  81 }
  82
  83 static void cryptd_fini_queue(struct cryptd_queue *queue)
  84 {
  85         int cpu;
  86         struct cryptd_cpu_queue *cpu_queue;
  87
  88         for_each_possible_cpu(cpu) {
  89                 cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
  90                 BUG_ON(cpu_queue->queue.qlen);
  91         }
  92         free_percpu(queue->cpu_queue);
  93 }
  94
  95 static int cryptd_enqueue_request(struct cryptd_queue *queue,
  96                                   struct crypto_async_request *request)
  97 {
  98         int cpu, err;
  99         struct cryptd_cpu_queue *cpu_queue;
 100
 101         cpu = get_cpu();
 102         cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
 103         err = crypto_enqueue_request(&cpu_queue->queue, request);
 104         queue_work_on(cpu, kcrypto_wq, &cpu_queue->work);
 105         put_cpu();
 106
 107         return err;
 108 }
 109
 110 /* Called in workqueue context, do one real cryption work (via
 111  * req->complete) and reschedule itself if there are more work to
 112  * do. */
 113 static void cryptd_queue_worker(struct work_struct *work)
 114 {
 115         struct cryptd_cpu_queue *cpu_queue;
 116         struct crypto_async_request *req, *backlog;
 117
 118         cpu_queue = container_of(work, struct cryptd_cpu_queue, work);
 119         /* Only handle one request at a time to avoid hogging crypto
 120          * workqueue. preempt_disable/enable is used to prevent
 121          * being preempted by cryptd_enqueue_request() */
 122         preempt_disable();
 123         backlog = crypto_get_backlog(&cpu_queue->queue);
 124         req = crypto_dequeue_request(&cpu_queue->queue);
 125         preempt_enable();
 126
 127         if (!req)
 128                 return;
 129
 130         if (backlog)
 131                 backlog->complete(backlog, -EINPROGRESS);
 132         req->complete(req, 0);
 133
 134         if (cpu_queue->queue.qlen)
 135                 queue_work(kcrypto_wq, &cpu_queue->work);
 136 }
 137
 138 static inline struct cryptd_queue *cryptd_get_queue(struct crypto_tfm *tfm)
 139 {
 140         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 141         struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
 142         return ictx->queue;
 143 }
 144
 145 static int cryptd_blkcipher_setkey(struct crypto_ablkcipher *parent,
 146                                    const u8 *key, unsigned int keylen)
 147 {
 148         struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(parent);
 149         struct crypto_blkcipher *child = ctx->child;
 150         int err;
 151
 152         crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 153         crypto_blkcipher_set_flags(child, crypto_ablkcipher_get_flags(parent) &
 154                                           CRYPTO_TFM_REQ_MASK);
 155         err = crypto_blkcipher_setkey(child, key, keylen);
 156         crypto_ablkcipher_set_flags(parent, crypto_blkcipher_get_flags(child) &
 157                                             CRYPTO_TFM_RES_MASK);
 158         return err;
 159 }
 160
 161 static void cryptd_blkcipher_crypt(struct ablkcipher_request *req,
 162                                    struct crypto_blkcipher *child,
 163                                    int err,
 164                                    int (*crypt)(struct blkcipher_desc *desc,
 165                                                 struct scatterlist *dst,
 166                                                 struct scatterlist *src,
 167                                                 unsigned int len))
 168 {
 169         struct cryptd_blkcipher_request_ctx *rctx;
 170         struct blkcipher_desc desc;
 171
 172         rctx = ablkcipher_request_ctx(req);
 173
 174         if (unlikely(err == -EINPROGRESS))
 175                 goto out;
 176
 177         desc.tfm = child;
 178         desc.info = req->info;
 179         desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 180
 181         err = crypt(&desc, req->dst, req->src, req->nbytes);
 182
 183         req->base.complete = rctx->complete;
 184
 185 out:
 186         local_bh_disable();
 187         rctx->complete(&req->base, err);
 188         local_bh_enable();
 189 }
 190
 191 static void cryptd_blkcipher_encrypt(struct crypto_async_request *req, int err)
 192 {
 193         struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
 194         struct crypto_blkcipher *child = ctx->child;
 195
 196         cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
 197                                crypto_blkcipher_crt(child)->encrypt);
 198 }
 199
 200 static void cryptd_blkcipher_decrypt(struct crypto_async_request *req, int err)
 201 {
 202         struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
 203         struct crypto_blkcipher *child = ctx->child;
 204
 205         cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
 206                                crypto_blkcipher_crt(child)->decrypt);
 207 }
 208
 209 static int cryptd_blkcipher_enqueue(struct ablkcipher_request *req,
 210                                     crypto_completion_t complete)
 211 {
 212         struct cryptd_blkcipher_request_ctx *rctx = ablkcipher_request_ctx(req);
 213         struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
 214         struct cryptd_queue *queue;
 215
 216         queue = cryptd_get_queue(crypto_ablkcipher_tfm(tfm));
 217         rctx->complete = req->base.complete;
 218         req->base.complete = complete;
 219
 220         return cryptd_enqueue_request(queue, &req->base);
 221 }
 222
 223 static int cryptd_blkcipher_encrypt_enqueue(struct ablkcipher_request *req)
 224 {
 225         return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_encrypt);
 226 }
 227
 228 static int cryptd_blkcipher_decrypt_enqueue(struct ablkcipher_request *req)
 229 {
 230         return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_decrypt);
 231 }
 232
 233 static int cryptd_blkcipher_init_tfm(struct crypto_tfm *tfm)
 234 {
 235         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 236         struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
 237         struct crypto_spawn *spawn = &ictx->spawn;
 238         struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
 239         struct crypto_blkcipher *cipher;
 240
 241         cipher = crypto_spawn_blkcipher(spawn);
 242         if (IS_ERR(cipher))
 243                 return PTR_ERR(cipher);
 244
 245         ctx->child = cipher;
 246         tfm->crt_ablkcipher.reqsize =
 247                 sizeof(struct cryptd_blkcipher_request_ctx);
 248         return 0;
 249 }
 250
 251 static void cryptd_blkcipher_exit_tfm(struct crypto_tfm *tfm)
 252 {
 253         struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
 254
 255         crypto_free_blkcipher(ctx->child);
 256 }
 257
 258 static struct crypto_instance *cryptd_alloc_instance(struct crypto_alg *alg,
 259                                                      unsigned int tail)
 260 {
 261         struct crypto_instance *inst;
 262         int err;
 263
 264         inst = kzalloc(sizeof(*inst) + tail, GFP_KERNEL);
 265         if (!inst) {
 266                 inst = ERR_PTR(-ENOMEM);
 267                 goto out;
 268         }
 269
 270         err = -ENAMETOOLONG;
 271         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 272                      "cryptd(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 273                 goto out_free_inst;
 274
 275         memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
 276
 277         inst->alg.cra_priority = alg->cra_priority + 50;
 278         inst->alg.cra_blocksize = alg->cra_blocksize;
 279         inst->alg.cra_alignmask = alg->cra_alignmask;
 280
 281 out:
 282         return inst;
 283
 284 out_free_inst:
 285         kfree(inst);
 286         inst = ERR_PTR(err);
 287         goto out;
 288 }
 289
 290 static int cryptd_create_blkcipher(struct crypto_template *tmpl,
 291                                    struct rtattr **tb,
 292                                    struct cryptd_queue *queue)
 293 {
 294         struct cryptd_instance_ctx *ctx;
 295         struct crypto_instance *inst;
 296         struct crypto_alg *alg;
 297         int err;
 298
 299         alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER,
 300                                   CRYPTO_ALG_TYPE_MASK);
 301         if (IS_ERR(alg))
 302                 return PTR_ERR(alg);
 303
 304         inst = cryptd_alloc_instance(alg, sizeof(*ctx));
 305         if (IS_ERR(inst))
 306                 goto out_put_alg;
 307
 308         ctx = crypto_instance_ctx(inst);
 309         ctx->queue = queue;
 310
 311         err = crypto_init_spawn(&ctx->spawn, alg, inst,
 312                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 313         if (err)
 314                 goto out_free_inst;
 315
 316         inst->alg.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC;
 317         inst->alg.cra_type = &crypto_ablkcipher_type;
 318
 319         inst->alg.cra_ablkcipher.ivsize = alg->cra_blkcipher.ivsize;
 320         inst->alg.cra_ablkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
 321         inst->alg.cra_ablkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
 322
 323         inst->alg.cra_ablkcipher.geniv = alg->cra_blkcipher.geniv;
 324
 325         inst->alg.cra_ctxsize = sizeof(struct cryptd_blkcipher_ctx);
 326
 327         inst->alg.cra_init = cryptd_blkcipher_init_tfm;
 328         inst->alg.cra_exit = cryptd_blkcipher_exit_tfm;
 329
 330         inst->alg.cra_ablkcipher.setkey = cryptd_blkcipher_setkey;
 331         inst->alg.cra_ablkcipher.encrypt = cryptd_blkcipher_encrypt_enqueue;
 332         inst->alg.cra_ablkcipher.decrypt = cryptd_blkcipher_decrypt_enqueue;
 333
 334         err = crypto_register_instance(tmpl, inst);
 335         if (err) {
 336                 crypto_drop_spawn(&ctx->spawn);
 337 out_free_inst:
 338                 kfree(inst);
 339         }
 340
 341 out_put_alg:
 342         crypto_mod_put(alg);
 343         return err;
 344 }
 345
 346 static int cryptd_hash_init_tfm(struct crypto_tfm *tfm)
 347 {
 348         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 349         struct hashd_instance_ctx *ictx = crypto_instance_ctx(inst);
 350         struct crypto_shash_spawn *spawn = &ictx->spawn;
 351         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 352         struct crypto_shash *hash;
 353
 354         hash = crypto_spawn_shash(spawn);
 355         if (IS_ERR(hash))
 356                 return PTR_ERR(hash);
 357
 358         ctx->child = hash;
 359         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 360                                  sizeof(struct cryptd_hash_request_ctx) +
 361                                  crypto_shash_descsize(hash));
 362         return 0;
 363 }
 364
 365 static void cryptd_hash_exit_tfm(struct crypto_tfm *tfm)
 366 {
 367         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 368
 369         crypto_free_shash(ctx->child);
 370 }
 371
 372 static int cryptd_hash_setkey(struct crypto_ahash *parent,
 373                                    const u8 *key, unsigned int keylen)
 374 {
 375         struct cryptd_hash_ctx *ctx   = crypto_ahash_ctx(parent);
 376         struct crypto_shash *child = ctx->child;
 377         int err;
 378
 379         crypto_shash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 380         crypto_shash_set_flags(child, crypto_ahash_get_flags(parent) &
 381                                       CRYPTO_TFM_REQ_MASK);
 382         err = crypto_shash_setkey(child, key, keylen);
 383         crypto_ahash_set_flags(parent, crypto_shash_get_flags(child) &
 384                                        CRYPTO_TFM_RES_MASK);
 385         return err;
 386 }
 387
 388 static int cryptd_hash_enqueue(struct ahash_request *req,
 389                                 crypto_completion_t complete)
 390 {
 391         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 392         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 393         struct cryptd_queue *queue =
 394                 cryptd_get_queue(crypto_ahash_tfm(tfm));
 395
 396         rctx->complete = req->base.complete;
 397         req->base.complete = complete;
 398
 399         return cryptd_enqueue_request(queue, &req->base);
 400 }
 401
 402 static void cryptd_hash_init(struct crypto_async_request *req_async, int err)
 403 {
 404         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 405         struct crypto_shash *child = ctx->child;
 406         struct ahash_request *req = ahash_request_cast(req_async);
 407         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 408         struct shash_desc *desc = &rctx->desc;
 409
 410         if (unlikely(err == -EINPROGRESS))
 411                 goto out;
 412
 413         desc->tfm = child;
 414         desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 415
 416         err = crypto_shash_init(desc);
 417
 418         req->base.complete = rctx->complete;
 419
 420 out:
 421         local_bh_disable();
 422         rctx->complete(&req->base, err);
 423         local_bh_enable();
 424 }
 425
 426 static int cryptd_hash_init_enqueue(struct ahash_request *req)
 427 {
 428         return cryptd_hash_enqueue(req, cryptd_hash_init);
 429 }
 430
 431 static void cryptd_hash_update(struct crypto_async_request *req_async, int err)
 432 {
 433         struct ahash_request *req = ahash_request_cast(req_async);
 434         struct cryptd_hash_request_ctx *rctx;
 435
 436         rctx = ahash_request_ctx(req);
 437
 438         if (unlikely(err == -EINPROGRESS))
 439                 goto out;
 440
 441         err = shash_ahash_update(req, &rctx->desc);
 442
 443         req->base.complete = rctx->complete;
 444
 445 out:
 446         local_bh_disable();
 447         rctx->complete(&req->base, err);
 448         local_bh_enable();
 449 }
 450
 451 static int cryptd_hash_update_enqueue(struct ahash_request *req)
 452 {
 453         return cryptd_hash_enqueue(req, cryptd_hash_update);
 454 }
 455
 456 static void cryptd_hash_final(struct crypto_async_request *req_async, int err)
 457 {
 458         struct ahash_request *req = ahash_request_cast(req_async);
 459         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 460
 461         if (unlikely(err == -EINPROGRESS))
 462                 goto out;
 463
 464         err = crypto_shash_final(&rctx->desc, req->result);
 465
 466         req->base.complete = rctx->complete;
 467
 468 out:
 469         local_bh_disable();
 470         rctx->complete(&req->base, err);
 471         local_bh_enable();
 472 }
 473
 474 static int cryptd_hash_final_enqueue(struct ahash_request *req)
 475 {
 476         return cryptd_hash_enqueue(req, cryptd_hash_final);
 477 }
 478
 479 static void cryptd_hash_digest(struct crypto_async_request *req_async, int err)
 480 {
 481         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 482         struct crypto_shash *child = ctx->child;
 483         struct ahash_request *req = ahash_request_cast(req_async);
 484         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 485         struct shash_desc *desc = &rctx->desc;
 486
 487         if (unlikely(err == -EINPROGRESS))
 488                 goto out;
 489
 490         desc->tfm = child;
 491         desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 492
 493         err = shash_ahash_digest(req, desc);
 494
 495         req->base.complete = rctx->complete;
 496
 497 out:
 498         local_bh_disable();
 499         rctx->complete(&req->base, err);
 500         local_bh_enable();
 501 }
 502
 503 static int cryptd_hash_digest_enqueue(struct ahash_request *req)
 504 {
 505         return cryptd_hash_enqueue(req, cryptd_hash_digest);
 506 }
 507
 508 static int cryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,
 509                               struct cryptd_queue *queue)
 510 {
 511         struct hashd_instance_ctx *ctx;
 512         struct crypto_instance *inst;
 513         struct shash_alg *salg;
 514         struct crypto_alg *alg;
 515         int err;
 516
 517         salg = shash_attr_alg(tb[1], 0, 0);
 518         if (IS_ERR(salg))
 519                 return PTR_ERR(salg);
 520
 521         alg = &salg->base;
 522         inst = cryptd_alloc_instance(alg, sizeof(*ctx));
 523         if (IS_ERR(inst))
 524                 goto out_put_alg;
 525
 526         ctx = crypto_instance_ctx(inst);
 527         ctx->queue = queue;
 528
 529         err = crypto_init_shash_spawn(&ctx->spawn, salg, inst);
 530         if (err)
 531                 goto out_free_inst;
 532
 533         inst->alg.cra_flags = CRYPTO_ALG_TYPE_AHASH | CRYPTO_ALG_ASYNC;
 534         inst->alg.cra_type = &crypto_ahash_type;
 535
 536         inst->alg.cra_ahash.digestsize = salg->digestsize;
 537         inst->alg.cra_ctxsize = sizeof(struct cryptd_hash_ctx);
 538
 539         inst->alg.cra_init = cryptd_hash_init_tfm;
 540         inst->alg.cra_exit = cryptd_hash_exit_tfm;
 541
 542         inst->alg.cra_ahash.init   = cryptd_hash_init_enqueue;
 543         inst->alg.cra_ahash.update = cryptd_hash_update_enqueue;
 544         inst->alg.cra_ahash.final  = cryptd_hash_final_enqueue;
 545         inst->alg.cra_ahash.setkey = cryptd_hash_setkey;
 546         inst->alg.cra_ahash.digest = cryptd_hash_digest_enqueue;
 547
 548         err = crypto_register_instance(tmpl, inst);
 549         if (err) {
 550                 crypto_drop_shash(&ctx->spawn);
 551 out_free_inst:
 552                 kfree(inst);
 553         }
 554
 555 out_put_alg:
 556         crypto_mod_put(alg);
 557         return err;
 558 }
 559
 560 static struct cryptd_queue queue;
 561
 562 static int cryptd_create(struct crypto_template *tmpl, struct rtattr **tb)
 563 {
 564         struct crypto_attr_type *algt;
 565
 566         algt = crypto_get_attr_type(tb);
 567         if (IS_ERR(algt))
 568                 return PTR_ERR(algt);
 569
 570         switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
 571         case CRYPTO_ALG_TYPE_BLKCIPHER:
 572                 return cryptd_create_blkcipher(tmpl, tb, &queue);
 573         case CRYPTO_ALG_TYPE_DIGEST:
 574                 return cryptd_create_hash(tmpl, tb, &queue);
 575         }
 576
 577         return -EINVAL;
 578 }
 579
 580 static void cryptd_free(struct crypto_instance *inst)
 581 {
 582         struct cryptd_instance_ctx *ctx = crypto_instance_ctx(inst);
 583
 584         crypto_drop_spawn(&ctx->spawn);
 585         kfree(inst);
 586 }
 587
 588 static struct crypto_template cryptd_tmpl = {
 589         .name = "cryptd",
 590         .create = cryptd_create,
 591         .free = cryptd_free,
 592         .module = THIS_MODULE,
 593 };
 594
 595 struct cryptd_ablkcipher *cryptd_alloc_ablkcipher(const char *alg_name,
 596                                                   u32 type, u32 mask)
 597 {
 598         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 599         struct crypto_tfm *tfm;
 600
 601         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 602                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 603                 return ERR_PTR(-EINVAL);
 604         type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
 605         type |= CRYPTO_ALG_TYPE_BLKCIPHER;
 606         mask &= ~CRYPTO_ALG_TYPE_MASK;
 607         mask |= (CRYPTO_ALG_GENIV | CRYPTO_ALG_TYPE_BLKCIPHER_MASK);
 608         tfm = crypto_alloc_base(cryptd_alg_name, type, mask);
 609         if (IS_ERR(tfm))
 610                 return ERR_CAST(tfm);
 611         if (tfm->__crt_alg->cra_module != THIS_MODULE) {
 612                 crypto_free_tfm(tfm);
 613                 return ERR_PTR(-EINVAL);
 614         }
 615
 616         return __cryptd_ablkcipher_cast(__crypto_ablkcipher_cast(tfm));
 617 }
 618 EXPORT_SYMBOL_GPL(cryptd_alloc_ablkcipher);
 619
 620 struct crypto_blkcipher *cryptd_ablkcipher_child(struct cryptd_ablkcipher *tfm)
 621 {
 622         struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(&tfm->base);
 623         return ctx->child;
 624 }
 625 EXPORT_SYMBOL_GPL(cryptd_ablkcipher_child);
 626
 627 void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm)
 628 {
 629         crypto_free_ablkcipher(&tfm->base);
 630 }
 631 EXPORT_SYMBOL_GPL(cryptd_free_ablkcipher);
 632
 633 static int __init cryptd_init(void)
 634 {
 635         int err;
 636
 637         err = cryptd_init_queue(&queue, CRYPTD_MAX_CPU_QLEN);
 638         if (err)
 639                 return err;
 640
 641         err = crypto_register_template(&cryptd_tmpl);
 642         if (err)
 643                 cryptd_fini_queue(&queue);
 644
 645         return err;
 646 }
 647
 648 static void __exit cryptd_exit(void)
 649 {
 650         cryptd_fini_queue(&queue);
 651         crypto_unregister_template(&cryptd_tmpl);
 652 }
 653
 654 module_init(cryptd_init);
 655 module_exit(cryptd_exit);
 656
 657 MODULE_LICENSE("GPL");
 658 MODULE_DESCRIPTION("Software async crypto daemon");