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 __percpu *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 = this_cpu_ptr(queue->cpu_queue);
 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 void *cryptd_alloc_instance(struct crypto_alg *alg, unsigned int head,
 259                                    unsigned int tail)
 260 {
 261         char *p;
 262         struct crypto_instance *inst;
 263         int err;
 264
 265         p = kzalloc(head + sizeof(*inst) + tail, GFP_KERNEL);
 266         if (!p)
 267                 return ERR_PTR(-ENOMEM);
 268
 269         inst = (void *)(p + head);
 270
 271         err = -ENAMETOOLONG;
 272         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 273                      "cryptd(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 274                 goto out_free_inst;
 275
 276         memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
 277
 278         inst->alg.cra_priority = alg->cra_priority + 50;
 279         inst->alg.cra_blocksize = alg->cra_blocksize;
 280         inst->alg.cra_alignmask = alg->cra_alignmask;
 281
 282 out:
 283         return p;
 284
 285 out_free_inst:
 286         kfree(p);
 287         p = ERR_PTR(err);
 288         goto out;
 289 }
 290
 291 static int cryptd_create_blkcipher(struct crypto_template *tmpl,
 292                                    struct rtattr **tb,
 293                                    struct cryptd_queue *queue)
 294 {
 295         struct cryptd_instance_ctx *ctx;
 296         struct crypto_instance *inst;
 297         struct crypto_alg *alg;
 298         int err;
 299
 300         alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER,
 301                                   CRYPTO_ALG_TYPE_MASK);
 302         if (IS_ERR(alg))
 303                 return PTR_ERR(alg);
 304
 305         inst = cryptd_alloc_instance(alg, 0, sizeof(*ctx));
 306         err = PTR_ERR(inst);
 307         if (IS_ERR(inst))
 308                 goto out_put_alg;
 309
 310         ctx = crypto_instance_ctx(inst);
 311         ctx->queue = queue;
 312
 313         err = crypto_init_spawn(&ctx->spawn, alg, inst,
 314                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 315         if (err)
 316                 goto out_free_inst;
 317
 318         inst->alg.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC;
 319         inst->alg.cra_type = &crypto_ablkcipher_type;
 320
 321         inst->alg.cra_ablkcipher.ivsize = alg->cra_blkcipher.ivsize;
 322         inst->alg.cra_ablkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
 323         inst->alg.cra_ablkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
 324
 325         inst->alg.cra_ablkcipher.geniv = alg->cra_blkcipher.geniv;
 326
 327         inst->alg.cra_ctxsize = sizeof(struct cryptd_blkcipher_ctx);
 328
 329         inst->alg.cra_init = cryptd_blkcipher_init_tfm;
 330         inst->alg.cra_exit = cryptd_blkcipher_exit_tfm;
 331
 332         inst->alg.cra_ablkcipher.setkey = cryptd_blkcipher_setkey;
 333         inst->alg.cra_ablkcipher.encrypt = cryptd_blkcipher_encrypt_enqueue;
 334         inst->alg.cra_ablkcipher.decrypt = cryptd_blkcipher_decrypt_enqueue;
 335
 336         err = crypto_register_instance(tmpl, inst);
 337         if (err) {
 338                 crypto_drop_spawn(&ctx->spawn);
 339 out_free_inst:
 340                 kfree(inst);
 341         }
 342
 343 out_put_alg:
 344         crypto_mod_put(alg);
 345         return err;
 346 }
 347
 348 static int cryptd_hash_init_tfm(struct crypto_tfm *tfm)
 349 {
 350         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 351         struct hashd_instance_ctx *ictx = crypto_instance_ctx(inst);
 352         struct crypto_shash_spawn *spawn = &ictx->spawn;
 353         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 354         struct crypto_shash *hash;
 355
 356         hash = crypto_spawn_shash(spawn);
 357         if (IS_ERR(hash))
 358                 return PTR_ERR(hash);
 359
 360         ctx->child = hash;
 361         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 362                                  sizeof(struct cryptd_hash_request_ctx) +
 363                                  crypto_shash_descsize(hash));
 364         return 0;
 365 }
 366
 367 static void cryptd_hash_exit_tfm(struct crypto_tfm *tfm)
 368 {
 369         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 370
 371         crypto_free_shash(ctx->child);
 372 }
 373
 374 static int cryptd_hash_setkey(struct crypto_ahash *parent,
 375                                    const u8 *key, unsigned int keylen)
 376 {
 377         struct cryptd_hash_ctx *ctx   = crypto_ahash_ctx(parent);
 378         struct crypto_shash *child = ctx->child;
 379         int err;
 380
 381         crypto_shash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 382         crypto_shash_set_flags(child, crypto_ahash_get_flags(parent) &
 383                                       CRYPTO_TFM_REQ_MASK);
 384         err = crypto_shash_setkey(child, key, keylen);
 385         crypto_ahash_set_flags(parent, crypto_shash_get_flags(child) &
 386                                        CRYPTO_TFM_RES_MASK);
 387         return err;
 388 }
 389
 390 static int cryptd_hash_enqueue(struct ahash_request *req,
 391                                 crypto_completion_t complete)
 392 {
 393         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 394         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 395         struct cryptd_queue *queue =
 396                 cryptd_get_queue(crypto_ahash_tfm(tfm));
 397
 398         rctx->complete = req->base.complete;
 399         req->base.complete = complete;
 400
 401         return cryptd_enqueue_request(queue, &req->base);
 402 }
 403
 404 static void cryptd_hash_init(struct crypto_async_request *req_async, int err)
 405 {
 406         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 407         struct crypto_shash *child = ctx->child;
 408         struct ahash_request *req = ahash_request_cast(req_async);
 409         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 410         struct shash_desc *desc = &rctx->desc;
 411
 412         if (unlikely(err == -EINPROGRESS))
 413                 goto out;
 414
 415         desc->tfm = child;
 416         desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 417
 418         err = crypto_shash_init(desc);
 419
 420         req->base.complete = rctx->complete;
 421
 422 out:
 423         local_bh_disable();
 424         rctx->complete(&req->base, err);
 425         local_bh_enable();
 426 }
 427
 428 static int cryptd_hash_init_enqueue(struct ahash_request *req)
 429 {
 430         return cryptd_hash_enqueue(req, cryptd_hash_init);
 431 }
 432
 433 static void cryptd_hash_update(struct crypto_async_request *req_async, int err)
 434 {
 435         struct ahash_request *req = ahash_request_cast(req_async);
 436         struct cryptd_hash_request_ctx *rctx;
 437
 438         rctx = ahash_request_ctx(req);
 439
 440         if (unlikely(err == -EINPROGRESS))
 441                 goto out;
 442
 443         err = shash_ahash_update(req, &rctx->desc);
 444
 445         req->base.complete = rctx->complete;
 446
 447 out:
 448         local_bh_disable();
 449         rctx->complete(&req->base, err);
 450         local_bh_enable();
 451 }
 452
 453 static int cryptd_hash_update_enqueue(struct ahash_request *req)
 454 {
 455         return cryptd_hash_enqueue(req, cryptd_hash_update);
 456 }
 457
 458 static void cryptd_hash_final(struct crypto_async_request *req_async, int err)
 459 {
 460         struct ahash_request *req = ahash_request_cast(req_async);
 461         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 462
 463         if (unlikely(err == -EINPROGRESS))
 464                 goto out;
 465
 466         err = crypto_shash_final(&rctx->desc, req->result);
 467
 468         req->base.complete = rctx->complete;
 469
 470 out:
 471         local_bh_disable();
 472         rctx->complete(&req->base, err);
 473         local_bh_enable();
 474 }
 475
 476 static int cryptd_hash_final_enqueue(struct ahash_request *req)
 477 {
 478         return cryptd_hash_enqueue(req, cryptd_hash_final);
 479 }
 480
 481 static void cryptd_hash_finup(struct crypto_async_request *req_async, int err)
 482 {
 483         struct ahash_request *req = ahash_request_cast(req_async);
 484         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 485
 486         if (unlikely(err == -EINPROGRESS))
 487                 goto out;
 488
 489         err = shash_ahash_finup(req, &rctx->desc);
 490
 491         req->base.complete = rctx->complete;
 492
 493 out:
 494         local_bh_disable();
 495         rctx->complete(&req->base, err);
 496         local_bh_enable();
 497 }
 498
 499 static int cryptd_hash_finup_enqueue(struct ahash_request *req)
 500 {
 501         return cryptd_hash_enqueue(req, cryptd_hash_finup);
 502 }
 503
 504 static void cryptd_hash_digest(struct crypto_async_request *req_async, int err)
 505 {
 506         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 507         struct crypto_shash *child = ctx->child;
 508         struct ahash_request *req = ahash_request_cast(req_async);
 509         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 510         struct shash_desc *desc = &rctx->desc;
 511
 512         if (unlikely(err == -EINPROGRESS))
 513                 goto out;
 514
 515         desc->tfm = child;
 516         desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 517
 518         err = shash_ahash_digest(req, desc);
 519
 520         req->base.complete = rctx->complete;
 521
 522 out:
 523         local_bh_disable();
 524         rctx->complete(&req->base, err);
 525         local_bh_enable();
 526 }
 527
 528 static int cryptd_hash_digest_enqueue(struct ahash_request *req)
 529 {
 530         return cryptd_hash_enqueue(req, cryptd_hash_digest);
 531 }
 532
 533 static int cryptd_hash_export(struct ahash_request *req, void *out)
 534 {
 535         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 536
 537         return crypto_shash_export(&rctx->desc, out);
 538 }
 539
 540 static int cryptd_hash_import(struct ahash_request *req, const void *in)
 541 {
 542         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 543
 544         return crypto_shash_import(&rctx->desc, in);
 545 }
 546
 547 static int cryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,
 548                               struct cryptd_queue *queue)
 549 {
 550         struct hashd_instance_ctx *ctx;
 551         struct ahash_instance *inst;
 552         struct shash_alg *salg;
 553         struct crypto_alg *alg;
 554         int err;
 555
 556         salg = shash_attr_alg(tb[1], 0, 0);
 557         if (IS_ERR(salg))
 558                 return PTR_ERR(salg);
 559
 560         alg = &salg->base;
 561         inst = cryptd_alloc_instance(alg, ahash_instance_headroom(),
 562                                      sizeof(*ctx));
 563         err = PTR_ERR(inst);
 564         if (IS_ERR(inst))
 565                 goto out_put_alg;
 566
 567         ctx = ahash_instance_ctx(inst);
 568         ctx->queue = queue;
 569
 570         err = crypto_init_shash_spawn(&ctx->spawn, salg,
 571                                       ahash_crypto_instance(inst));
 572         if (err)
 573                 goto out_free_inst;
 574
 575         inst->alg.halg.base.cra_flags = CRYPTO_ALG_ASYNC;
 576
 577         inst->alg.halg.digestsize = salg->digestsize;
 578         inst->alg.halg.base.cra_ctxsize = sizeof(struct cryptd_hash_ctx);
 579
 580         inst->alg.halg.base.cra_init = cryptd_hash_init_tfm;
 581         inst->alg.halg.base.cra_exit = cryptd_hash_exit_tfm;
 582
 583         inst->alg.init   = cryptd_hash_init_enqueue;
 584         inst->alg.update = cryptd_hash_update_enqueue;
 585         inst->alg.final  = cryptd_hash_final_enqueue;
 586         inst->alg.finup  = cryptd_hash_finup_enqueue;
 587         inst->alg.export = cryptd_hash_export;
 588         inst->alg.import = cryptd_hash_import;
 589         inst->alg.setkey = cryptd_hash_setkey;
 590         inst->alg.digest = cryptd_hash_digest_enqueue;
 591
 592         err = ahash_register_instance(tmpl, inst);
 593         if (err) {
 594                 crypto_drop_shash(&ctx->spawn);
 595 out_free_inst:
 596                 kfree(inst);
 597         }
 598
 599 out_put_alg:
 600         crypto_mod_put(alg);
 601         return err;
 602 }
 603
 604 static struct cryptd_queue queue;
 605
 606 static int cryptd_create(struct crypto_template *tmpl, struct rtattr **tb)
 607 {
 608         struct crypto_attr_type *algt;
 609
 610         algt = crypto_get_attr_type(tb);
 611         if (IS_ERR(algt))
 612                 return PTR_ERR(algt);
 613
 614         switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
 615         case CRYPTO_ALG_TYPE_BLKCIPHER:
 616                 return cryptd_create_blkcipher(tmpl, tb, &queue);
 617         case CRYPTO_ALG_TYPE_DIGEST:
 618                 return cryptd_create_hash(tmpl, tb, &queue);
 619         }
 620
 621         return -EINVAL;
 622 }
 623
 624 static void cryptd_free(struct crypto_instance *inst)
 625 {
 626         struct cryptd_instance_ctx *ctx = crypto_instance_ctx(inst);
 627         struct hashd_instance_ctx *hctx = crypto_instance_ctx(inst);
 628
 629         switch (inst->alg.cra_flags & CRYPTO_ALG_TYPE_MASK) {
 630         case CRYPTO_ALG_TYPE_AHASH:
 631                 crypto_drop_shash(&hctx->spawn);
 632                 kfree(ahash_instance(inst));
 633                 return;
 634         }
 635
 636         crypto_drop_spawn(&ctx->spawn);
 637         kfree(inst);
 638 }
 639
 640 static struct crypto_template cryptd_tmpl = {
 641         .name = "cryptd",
 642         .create = cryptd_create,
 643         .free = cryptd_free,
 644         .module = THIS_MODULE,
 645 };
 646
 647 struct cryptd_ablkcipher *cryptd_alloc_ablkcipher(const char *alg_name,
 648                                                   u32 type, u32 mask)
 649 {
 650         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 651         struct crypto_tfm *tfm;
 652
 653         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 654                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 655                 return ERR_PTR(-EINVAL);
 656         type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
 657         type |= CRYPTO_ALG_TYPE_BLKCIPHER;
 658         mask &= ~CRYPTO_ALG_TYPE_MASK;
 659         mask |= (CRYPTO_ALG_GENIV | CRYPTO_ALG_TYPE_BLKCIPHER_MASK);
 660         tfm = crypto_alloc_base(cryptd_alg_name, type, mask);
 661         if (IS_ERR(tfm))
 662                 return ERR_CAST(tfm);
 663         if (tfm->__crt_alg->cra_module != THIS_MODULE) {
 664                 crypto_free_tfm(tfm);
 665                 return ERR_PTR(-EINVAL);
 666         }
 667
 668         return __cryptd_ablkcipher_cast(__crypto_ablkcipher_cast(tfm));
 669 }
 670 EXPORT_SYMBOL_GPL(cryptd_alloc_ablkcipher);
 671
 672 struct crypto_blkcipher *cryptd_ablkcipher_child(struct cryptd_ablkcipher *tfm)
 673 {
 674         struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(&tfm->base);
 675         return ctx->child;
 676 }
 677 EXPORT_SYMBOL_GPL(cryptd_ablkcipher_child);
 678
 679 void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm)
 680 {
 681         crypto_free_ablkcipher(&tfm->base);
 682 }
 683 EXPORT_SYMBOL_GPL(cryptd_free_ablkcipher);
 684
 685 struct cryptd_ahash *cryptd_alloc_ahash(const char *alg_name,
 686                                         u32 type, u32 mask)
 687 {
 688         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 689         struct crypto_ahash *tfm;
 690
 691         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 692                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 693                 return ERR_PTR(-EINVAL);
 694         tfm = crypto_alloc_ahash(cryptd_alg_name, type, mask);
 695         if (IS_ERR(tfm))
 696                 return ERR_CAST(tfm);
 697         if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
 698                 crypto_free_ahash(tfm);
 699                 return ERR_PTR(-EINVAL);
 700         }
 701
 702         return __cryptd_ahash_cast(tfm);
 703 }
 704 EXPORT_SYMBOL_GPL(cryptd_alloc_ahash);
 705
 706 struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm)
 707 {
 708         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
 709
 710         return ctx->child;
 711 }
 712 EXPORT_SYMBOL_GPL(cryptd_ahash_child);
 713
 714 struct shash_desc *cryptd_shash_desc(struct ahash_request *req)
 715 {
 716         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 717         return &rctx->desc;
 718 }
 719 EXPORT_SYMBOL_GPL(cryptd_shash_desc);
 720
 721 void cryptd_free_ahash(struct cryptd_ahash *tfm)
 722 {
 723         crypto_free_ahash(&tfm->base);
 724 }
 725 EXPORT_SYMBOL_GPL(cryptd_free_ahash);
 726
 727 static int __init cryptd_init(void)
 728 {
 729         int err;
 730
 731         err = cryptd_init_queue(&queue, CRYPTD_MAX_CPU_QLEN);
 732         if (err)
 733                 return err;
 734
 735         err = crypto_register_template(&cryptd_tmpl);
 736         if (err)
 737                 cryptd_fini_queue(&queue);
 738
 739         return err;
 740 }
 741
 742 static void __exit cryptd_exit(void)
 743 {
 744         cryptd_fini_queue(&queue);
 745         crypto_unregister_template(&cryptd_tmpl);
 746 }
 747
 748 module_init(cryptd_init);
 749 module_exit(cryptd_exit);
 750
 751 MODULE_LICENSE("GPL");
 752 MODULE_DESCRIPTION("Software async crypto daemon");