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 struct crypto_instance *cryptd_alloc_blkcipher(
 291         struct rtattr **tb, struct cryptd_queue *queue)
 292 {
 293         struct cryptd_instance_ctx *ctx;
 294         struct crypto_instance *inst;
 295         struct crypto_alg *alg;
 296         int err;
 297
 298         alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER,
 299                                   CRYPTO_ALG_TYPE_MASK);
 300         if (IS_ERR(alg))
 301                 return ERR_CAST(alg);
 302
 303         inst = cryptd_alloc_instance(alg, sizeof(*ctx));
 304         if (IS_ERR(inst))
 305                 goto out_put_alg;
 306
 307         ctx = crypto_instance_ctx(inst);
 308         ctx->queue = queue;
 309
 310         err = crypto_init_spawn(&ctx->spawn, alg, inst,
 311                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 312         if (err)
 313                 goto out_free_inst;
 314
 315         inst->alg.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC;
 316         inst->alg.cra_type = &crypto_ablkcipher_type;
 317
 318         inst->alg.cra_ablkcipher.ivsize = alg->cra_blkcipher.ivsize;
 319         inst->alg.cra_ablkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
 320         inst->alg.cra_ablkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
 321
 322         inst->alg.cra_ablkcipher.geniv = alg->cra_blkcipher.geniv;
 323
 324         inst->alg.cra_ctxsize = sizeof(struct cryptd_blkcipher_ctx);
 325
 326         inst->alg.cra_init = cryptd_blkcipher_init_tfm;
 327         inst->alg.cra_exit = cryptd_blkcipher_exit_tfm;
 328
 329         inst->alg.cra_ablkcipher.setkey = cryptd_blkcipher_setkey;
 330         inst->alg.cra_ablkcipher.encrypt = cryptd_blkcipher_encrypt_enqueue;
 331         inst->alg.cra_ablkcipher.decrypt = cryptd_blkcipher_decrypt_enqueue;
 332
 333 out_put_alg:
 334         crypto_mod_put(alg);
 335         return inst;
 336
 337 out_free_inst:
 338         kfree(inst);
 339         inst = ERR_PTR(err);
 340         goto out_put_alg;
 341 }
 342
 343 static int cryptd_hash_init_tfm(struct crypto_tfm *tfm)
 344 {
 345         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 346         struct hashd_instance_ctx *ictx = crypto_instance_ctx(inst);
 347         struct crypto_shash_spawn *spawn = &ictx->spawn;
 348         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 349         struct crypto_shash *hash;
 350
 351         hash = crypto_spawn_shash(spawn);
 352         if (IS_ERR(hash))
 353                 return PTR_ERR(hash);
 354
 355         ctx->child = hash;
 356         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 357                                  sizeof(struct cryptd_hash_request_ctx) +
 358                                  crypto_shash_descsize(hash));
 359         return 0;
 360 }
 361
 362 static void cryptd_hash_exit_tfm(struct crypto_tfm *tfm)
 363 {
 364         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 365
 366         crypto_free_shash(ctx->child);
 367 }
 368
 369 static int cryptd_hash_setkey(struct crypto_ahash *parent,
 370                                    const u8 *key, unsigned int keylen)
 371 {
 372         struct cryptd_hash_ctx *ctx   = crypto_ahash_ctx(parent);
 373         struct crypto_shash *child = ctx->child;
 374         int err;
 375
 376         crypto_shash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 377         crypto_shash_set_flags(child, crypto_ahash_get_flags(parent) &
 378                                       CRYPTO_TFM_REQ_MASK);
 379         err = crypto_shash_setkey(child, key, keylen);
 380         crypto_ahash_set_flags(parent, crypto_shash_get_flags(child) &
 381                                        CRYPTO_TFM_RES_MASK);
 382         return err;
 383 }
 384
 385 static int cryptd_hash_enqueue(struct ahash_request *req,
 386                                 crypto_completion_t complete)
 387 {
 388         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 389         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 390         struct cryptd_queue *queue =
 391                 cryptd_get_queue(crypto_ahash_tfm(tfm));
 392
 393         rctx->complete = req->base.complete;
 394         req->base.complete = complete;
 395
 396         return cryptd_enqueue_request(queue, &req->base);
 397 }
 398
 399 static void cryptd_hash_init(struct crypto_async_request *req_async, int err)
 400 {
 401         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 402         struct crypto_shash *child = ctx->child;
 403         struct ahash_request *req = ahash_request_cast(req_async);
 404         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 405         struct shash_desc *desc = &rctx->desc;
 406
 407         if (unlikely(err == -EINPROGRESS))
 408                 goto out;
 409
 410         desc->tfm = child;
 411         desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 412
 413         err = crypto_shash_init(desc);
 414
 415         req->base.complete = rctx->complete;
 416
 417 out:
 418         local_bh_disable();
 419         rctx->complete(&req->base, err);
 420         local_bh_enable();
 421 }
 422
 423 static int cryptd_hash_init_enqueue(struct ahash_request *req)
 424 {
 425         return cryptd_hash_enqueue(req, cryptd_hash_init);
 426 }
 427
 428 static void cryptd_hash_update(struct crypto_async_request *req_async, int err)
 429 {
 430         struct ahash_request *req = ahash_request_cast(req_async);
 431         struct cryptd_hash_request_ctx *rctx;
 432
 433         rctx = ahash_request_ctx(req);
 434
 435         if (unlikely(err == -EINPROGRESS))
 436                 goto out;
 437
 438         err = shash_ahash_update(req, &rctx->desc);
 439
 440         req->base.complete = rctx->complete;
 441
 442 out:
 443         local_bh_disable();
 444         rctx->complete(&req->base, err);
 445         local_bh_enable();
 446 }
 447
 448 static int cryptd_hash_update_enqueue(struct ahash_request *req)
 449 {
 450         return cryptd_hash_enqueue(req, cryptd_hash_update);
 451 }
 452
 453 static void cryptd_hash_final(struct crypto_async_request *req_async, int err)
 454 {
 455         struct ahash_request *req = ahash_request_cast(req_async);
 456         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 457
 458         if (unlikely(err == -EINPROGRESS))
 459                 goto out;
 460
 461         err = crypto_shash_final(&rctx->desc, req->result);
 462
 463         req->base.complete = rctx->complete;
 464
 465 out:
 466         local_bh_disable();
 467         rctx->complete(&req->base, err);
 468         local_bh_enable();
 469 }
 470
 471 static int cryptd_hash_final_enqueue(struct ahash_request *req)
 472 {
 473         return cryptd_hash_enqueue(req, cryptd_hash_final);
 474 }
 475
 476 static void cryptd_hash_digest(struct crypto_async_request *req_async, int err)
 477 {
 478         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 479         struct crypto_shash *child = ctx->child;
 480         struct ahash_request *req = ahash_request_cast(req_async);
 481         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 482         struct shash_desc *desc = &rctx->desc;
 483
 484         if (unlikely(err == -EINPROGRESS))
 485                 goto out;
 486
 487         desc->tfm = child;
 488         desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 489
 490         err = shash_ahash_digest(req, desc);
 491
 492         req->base.complete = rctx->complete;
 493
 494 out:
 495         local_bh_disable();
 496         rctx->complete(&req->base, err);
 497         local_bh_enable();
 498 }
 499
 500 static int cryptd_hash_digest_enqueue(struct ahash_request *req)
 501 {
 502         return cryptd_hash_enqueue(req, cryptd_hash_digest);
 503 }
 504
 505 static struct crypto_instance *cryptd_alloc_hash(
 506         struct rtattr **tb, struct cryptd_queue *queue)
 507 {
 508         struct hashd_instance_ctx *ctx;
 509         struct crypto_instance *inst;
 510         struct shash_alg *salg;
 511         struct crypto_alg *alg;
 512         int err;
 513
 514         salg = shash_attr_alg(tb[1], 0, 0);
 515         if (IS_ERR(salg))
 516                 return ERR_CAST(salg);
 517
 518         alg = &salg->base;
 519         inst = cryptd_alloc_instance(alg, sizeof(*ctx));
 520         if (IS_ERR(inst))
 521                 goto out_put_alg;
 522
 523         ctx = crypto_instance_ctx(inst);
 524         ctx->queue = queue;
 525
 526         err = crypto_init_shash_spawn(&ctx->spawn, salg, inst);
 527         if (err)
 528                 goto out_free_inst;
 529
 530         inst->alg.cra_flags = CRYPTO_ALG_TYPE_AHASH | CRYPTO_ALG_ASYNC;
 531         inst->alg.cra_type = &crypto_ahash_type;
 532
 533         inst->alg.cra_ahash.digestsize = salg->digestsize;
 534         inst->alg.cra_ctxsize = sizeof(struct cryptd_hash_ctx);
 535
 536         inst->alg.cra_init = cryptd_hash_init_tfm;
 537         inst->alg.cra_exit = cryptd_hash_exit_tfm;
 538
 539         inst->alg.cra_ahash.init   = cryptd_hash_init_enqueue;
 540         inst->alg.cra_ahash.update = cryptd_hash_update_enqueue;
 541         inst->alg.cra_ahash.final  = cryptd_hash_final_enqueue;
 542         inst->alg.cra_ahash.setkey = cryptd_hash_setkey;
 543         inst->alg.cra_ahash.digest = cryptd_hash_digest_enqueue;
 544
 545 out_put_alg:
 546         crypto_mod_put(alg);
 547         return inst;
 548
 549 out_free_inst:
 550         kfree(inst);
 551         inst = ERR_PTR(err);
 552         goto out_put_alg;
 553 }
 554
 555 static struct cryptd_queue queue;
 556
 557 static struct crypto_instance *cryptd_alloc(struct rtattr **tb)
 558 {
 559         struct crypto_attr_type *algt;
 560
 561         algt = crypto_get_attr_type(tb);
 562         if (IS_ERR(algt))
 563                 return ERR_CAST(algt);
 564
 565         switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
 566         case CRYPTO_ALG_TYPE_BLKCIPHER:
 567                 return cryptd_alloc_blkcipher(tb, &queue);
 568         case CRYPTO_ALG_TYPE_DIGEST:
 569                 return cryptd_alloc_hash(tb, &queue);
 570         }
 571
 572         return ERR_PTR(-EINVAL);
 573 }
 574
 575 static void cryptd_free(struct crypto_instance *inst)
 576 {
 577         struct cryptd_instance_ctx *ctx = crypto_instance_ctx(inst);
 578
 579         crypto_drop_spawn(&ctx->spawn);
 580         kfree(inst);
 581 }
 582
 583 static struct crypto_template cryptd_tmpl = {
 584         .name = "cryptd",
 585         .alloc = cryptd_alloc,
 586         .free = cryptd_free,
 587         .module = THIS_MODULE,
 588 };
 589
 590 struct cryptd_ablkcipher *cryptd_alloc_ablkcipher(const char *alg_name,
 591                                                   u32 type, u32 mask)
 592 {
 593         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 594         struct crypto_tfm *tfm;
 595
 596         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 597                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 598                 return ERR_PTR(-EINVAL);
 599         type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
 600         type |= CRYPTO_ALG_TYPE_BLKCIPHER;
 601         mask &= ~CRYPTO_ALG_TYPE_MASK;
 602         mask |= (CRYPTO_ALG_GENIV | CRYPTO_ALG_TYPE_BLKCIPHER_MASK);
 603         tfm = crypto_alloc_base(cryptd_alg_name, type, mask);
 604         if (IS_ERR(tfm))
 605                 return ERR_CAST(tfm);
 606         if (tfm->__crt_alg->cra_module != THIS_MODULE) {
 607                 crypto_free_tfm(tfm);
 608                 return ERR_PTR(-EINVAL);
 609         }
 610
 611         return __cryptd_ablkcipher_cast(__crypto_ablkcipher_cast(tfm));
 612 }
 613 EXPORT_SYMBOL_GPL(cryptd_alloc_ablkcipher);
 614
 615 struct crypto_blkcipher *cryptd_ablkcipher_child(struct cryptd_ablkcipher *tfm)
 616 {
 617         struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(&tfm->base);
 618         return ctx->child;
 619 }
 620 EXPORT_SYMBOL_GPL(cryptd_ablkcipher_child);
 621
 622 void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm)
 623 {
 624         crypto_free_ablkcipher(&tfm->base);
 625 }
 626 EXPORT_SYMBOL_GPL(cryptd_free_ablkcipher);
 627
 628 static int __init cryptd_init(void)
 629 {
 630         int err;
 631
 632         err = cryptd_init_queue(&queue, CRYPTD_MAX_CPU_QLEN);
 633         if (err)
 634                 return err;
 635
 636         err = crypto_register_template(&cryptd_tmpl);
 637         if (err)
 638                 cryptd_fini_queue(&queue);
 639
 640         return err;
 641 }
 642
 643 static void __exit cryptd_exit(void)
 644 {
 645         cryptd_fini_queue(&queue);
 646         crypto_unregister_template(&cryptd_tmpl);
 647 }
 648
 649 module_init(cryptd_init);
 650 module_exit(cryptd_exit);
 651
 652 MODULE_LICENSE("GPL");
 653 MODULE_DESCRIPTION("Software async crypto daemon");