crypto/cryptd.c

   1 /*
   2  * Software async crypto daemon.
   3  *
   4  * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
   5  *
   6  * Added AEAD support to cryptd.
   7  *    Authors: Tadeusz Struk (tadeusz.struk@intel.com)
   8  *             Adrian Hoban <adrian.hoban@intel.com>
   9  *             Gabriele Paoloni <gabriele.paoloni@intel.com>
  10  *             Aidan O'Mahony (aidan.o.mahony@intel.com)
  11  *    Copyright (c) 2010, Intel Corporation.
  12  *
  13  * This program is free software; you can redistribute it and/or modify it
  14  * under the terms of the GNU General Public License as published by the Free
  15  * Software Foundation; either version 2 of the License, or (at your option)
  16  * any later version.
  17  *
  18  */
  19
  20 #include <crypto/algapi.h>
  21 #include <crypto/internal/hash.h>
  22 #include <crypto/internal/aead.h>
  23 #include <crypto/cryptd.h>
  24 #include <crypto/crypto_wq.h>
  25 #include <linux/err.h>
  26 #include <linux/init.h>
  27 #include <linux/kernel.h>
  28 #include <linux/list.h>
  29 #include <linux/module.h>
  30 #include <linux/scatterlist.h>
  31 #include <linux/sched.h>
  32 #include <linux/slab.h>
  33
  34 #define CRYPTD_MAX_CPU_QLEN 100
  35
  36 struct cryptd_cpu_queue {
  37         struct crypto_queue queue;
  38         struct work_struct work;
  39 };
  40
  41 struct cryptd_queue {
  42         struct cryptd_cpu_queue __percpu *cpu_queue;
  43 };
  44
  45 struct cryptd_instance_ctx {
  46         struct crypto_spawn spawn;
  47         struct cryptd_queue *queue;
  48 };
  49
  50 struct hashd_instance_ctx {
  51         struct crypto_shash_spawn spawn;
  52         struct cryptd_queue *queue;
  53 };
  54
  55 struct aead_instance_ctx {
  56         struct crypto_aead_spawn aead_spawn;
  57         struct cryptd_queue *queue;
  58 };
  59
  60 struct cryptd_blkcipher_ctx {
  61         struct crypto_blkcipher *child;
  62 };
  63
  64 struct cryptd_blkcipher_request_ctx {
  65         crypto_completion_t complete;
  66 };
  67
  68 struct cryptd_hash_ctx {
  69         struct crypto_shash *child;
  70 };
  71
  72 struct cryptd_hash_request_ctx {
  73         crypto_completion_t complete;
  74         struct shash_desc desc;
  75 };
  76
  77 struct cryptd_aead_ctx {
  78         struct crypto_aead *child;
  79 };
  80
  81 struct cryptd_aead_request_ctx {
  82         crypto_completion_t complete;
  83 };
  84
  85 static void cryptd_queue_worker(struct work_struct *work);
  86
  87 static int cryptd_init_queue(struct cryptd_queue *queue,
  88                              unsigned int max_cpu_qlen)
  89 {
  90         int cpu;
  91         struct cryptd_cpu_queue *cpu_queue;
  92
  93         queue->cpu_queue = alloc_percpu(struct cryptd_cpu_queue);
  94         if (!queue->cpu_queue)
  95                 return -ENOMEM;
  96         for_each_possible_cpu(cpu) {
  97                 cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
  98                 crypto_init_queue(&cpu_queue->queue, max_cpu_qlen);
  99                 INIT_WORK(&cpu_queue->work, cryptd_queue_worker);
 100         }
 101         return 0;
 102 }
 103
 104 static void cryptd_fini_queue(struct cryptd_queue *queue)
 105 {
 106         int cpu;
 107         struct cryptd_cpu_queue *cpu_queue;
 108
 109         for_each_possible_cpu(cpu) {
 110                 cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
 111                 BUG_ON(cpu_queue->queue.qlen);
 112         }
 113         free_percpu(queue->cpu_queue);
 114 }
 115
 116 static int cryptd_enqueue_request(struct cryptd_queue *queue,
 117                                   struct crypto_async_request *request)
 118 {
 119         int cpu, err;
 120         struct cryptd_cpu_queue *cpu_queue;
 121
 122         cpu = get_cpu();
 123         cpu_queue = this_cpu_ptr(queue->cpu_queue);
 124         err = crypto_enqueue_request(&cpu_queue->queue, request);
 125         queue_work_on(cpu, kcrypto_wq, &cpu_queue->work);
 126         put_cpu();
 127
 128         return err;
 129 }
 130
 131 /* Called in workqueue context, do one real cryption work (via
 132  * req->complete) and reschedule itself if there are more work to
 133  * do. */
 134 static void cryptd_queue_worker(struct work_struct *work)
 135 {
 136         struct cryptd_cpu_queue *cpu_queue;
 137         struct crypto_async_request *req, *backlog;
 138
 139         cpu_queue = container_of(work, struct cryptd_cpu_queue, work);
 140         /*
 141          * Only handle one request at a time to avoid hogging crypto workqueue.
 142          * preempt_disable/enable is used to prevent being preempted by
 143          * cryptd_enqueue_request(). local_bh_disable/enable is used to prevent
 144          * cryptd_enqueue_request() being accessed from software interrupts.
 145          */
 146         local_bh_disable();
 147         preempt_disable();
 148         backlog = crypto_get_backlog(&cpu_queue->queue);
 149         req = crypto_dequeue_request(&cpu_queue->queue);
 150         preempt_enable();
 151         local_bh_enable();
 152
 153         if (!req)
 154                 return;
 155
 156         if (backlog)
 157                 backlog->complete(backlog, -EINPROGRESS);
 158         req->complete(req, 0);
 159
 160         if (cpu_queue->queue.qlen)
 161                 queue_work(kcrypto_wq, &cpu_queue->work);
 162 }
 163
 164 static inline struct cryptd_queue *cryptd_get_queue(struct crypto_tfm *tfm)
 165 {
 166         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 167         struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
 168         return ictx->queue;
 169 }
 170
 171 static inline void cryptd_check_internal(struct rtattr **tb, u32 *type,
 172                                          u32 *mask)
 173 {
 174         struct crypto_attr_type *algt;
 175
 176         algt = crypto_get_attr_type(tb);
 177         if (IS_ERR(algt))
 178                 return;
 179         if ((algt->type & CRYPTO_ALG_INTERNAL))
 180                 *type |= CRYPTO_ALG_INTERNAL;
 181         if ((algt->mask & CRYPTO_ALG_INTERNAL))
 182                 *mask |= CRYPTO_ALG_INTERNAL;
 183 }
 184
 185 static int cryptd_blkcipher_setkey(struct crypto_ablkcipher *parent,
 186                                    const u8 *key, unsigned int keylen)
 187 {
 188         struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(parent);
 189         struct crypto_blkcipher *child = ctx->child;
 190         int err;
 191
 192         crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 193         crypto_blkcipher_set_flags(child, crypto_ablkcipher_get_flags(parent) &
 194                                           CRYPTO_TFM_REQ_MASK);
 195         err = crypto_blkcipher_setkey(child, key, keylen);
 196         crypto_ablkcipher_set_flags(parent, crypto_blkcipher_get_flags(child) &
 197                                             CRYPTO_TFM_RES_MASK);
 198         return err;
 199 }
 200
 201 static void cryptd_blkcipher_crypt(struct ablkcipher_request *req,
 202                                    struct crypto_blkcipher *child,
 203                                    int err,
 204                                    int (*crypt)(struct blkcipher_desc *desc,
 205                                                 struct scatterlist *dst,
 206                                                 struct scatterlist *src,
 207                                                 unsigned int len))
 208 {
 209         struct cryptd_blkcipher_request_ctx *rctx;
 210         struct blkcipher_desc desc;
 211
 212         rctx = ablkcipher_request_ctx(req);
 213
 214         if (unlikely(err == -EINPROGRESS))
 215                 goto out;
 216
 217         desc.tfm = child;
 218         desc.info = req->info;
 219         desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 220
 221         err = crypt(&desc, req->dst, req->src, req->nbytes);
 222
 223         req->base.complete = rctx->complete;
 224
 225 out:
 226         local_bh_disable();
 227         rctx->complete(&req->base, err);
 228         local_bh_enable();
 229 }
 230
 231 static void cryptd_blkcipher_encrypt(struct crypto_async_request *req, int err)
 232 {
 233         struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
 234         struct crypto_blkcipher *child = ctx->child;
 235
 236         cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
 237                                crypto_blkcipher_crt(child)->encrypt);
 238 }
 239
 240 static void cryptd_blkcipher_decrypt(struct crypto_async_request *req, int err)
 241 {
 242         struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
 243         struct crypto_blkcipher *child = ctx->child;
 244
 245         cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
 246                                crypto_blkcipher_crt(child)->decrypt);
 247 }
 248
 249 static int cryptd_blkcipher_enqueue(struct ablkcipher_request *req,
 250                                     crypto_completion_t compl)
 251 {
 252         struct cryptd_blkcipher_request_ctx *rctx = ablkcipher_request_ctx(req);
 253         struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
 254         struct cryptd_queue *queue;
 255
 256         queue = cryptd_get_queue(crypto_ablkcipher_tfm(tfm));
 257         rctx->complete = req->base.complete;
 258         req->base.complete = compl;
 259
 260         return cryptd_enqueue_request(queue, &req->base);
 261 }
 262
 263 static int cryptd_blkcipher_encrypt_enqueue(struct ablkcipher_request *req)
 264 {
 265         return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_encrypt);
 266 }
 267
 268 static int cryptd_blkcipher_decrypt_enqueue(struct ablkcipher_request *req)
 269 {
 270         return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_decrypt);
 271 }
 272
 273 static int cryptd_blkcipher_init_tfm(struct crypto_tfm *tfm)
 274 {
 275         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 276         struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
 277         struct crypto_spawn *spawn = &ictx->spawn;
 278         struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
 279         struct crypto_blkcipher *cipher;
 280
 281         cipher = crypto_spawn_blkcipher(spawn);
 282         if (IS_ERR(cipher))
 283                 return PTR_ERR(cipher);
 284
 285         ctx->child = cipher;
 286         tfm->crt_ablkcipher.reqsize =
 287                 sizeof(struct cryptd_blkcipher_request_ctx);
 288         return 0;
 289 }
 290
 291 static void cryptd_blkcipher_exit_tfm(struct crypto_tfm *tfm)
 292 {
 293         struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
 294
 295         crypto_free_blkcipher(ctx->child);
 296 }
 297
 298 static void *cryptd_alloc_instance(struct crypto_alg *alg, unsigned int head,
 299                                    unsigned int tail)
 300 {
 301         char *p;
 302         struct crypto_instance *inst;
 303         int err;
 304
 305         p = kzalloc(head + sizeof(*inst) + tail, GFP_KERNEL);
 306         if (!p)
 307                 return ERR_PTR(-ENOMEM);
 308
 309         inst = (void *)(p + head);
 310
 311         err = -ENAMETOOLONG;
 312         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 313                      "cryptd(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 314                 goto out_free_inst;
 315
 316         memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
 317
 318         inst->alg.cra_priority = alg->cra_priority + 50;
 319         inst->alg.cra_blocksize = alg->cra_blocksize;
 320         inst->alg.cra_alignmask = alg->cra_alignmask;
 321
 322 out:
 323         return p;
 324
 325 out_free_inst:
 326         kfree(p);
 327         p = ERR_PTR(err);
 328         goto out;
 329 }
 330
 331 static int cryptd_create_blkcipher(struct crypto_template *tmpl,
 332                                    struct rtattr **tb,
 333                                    struct cryptd_queue *queue)
 334 {
 335         struct cryptd_instance_ctx *ctx;
 336         struct crypto_instance *inst;
 337         struct crypto_alg *alg;
 338         u32 type = CRYPTO_ALG_TYPE_BLKCIPHER;
 339         u32 mask = CRYPTO_ALG_TYPE_MASK;
 340         int err;
 341
 342         cryptd_check_internal(tb, &type, &mask);
 343
 344         alg = crypto_get_attr_alg(tb, type, mask);
 345         if (IS_ERR(alg))
 346                 return PTR_ERR(alg);
 347
 348         inst = cryptd_alloc_instance(alg, 0, sizeof(*ctx));
 349         err = PTR_ERR(inst);
 350         if (IS_ERR(inst))
 351                 goto out_put_alg;
 352
 353         ctx = crypto_instance_ctx(inst);
 354         ctx->queue = queue;
 355
 356         err = crypto_init_spawn(&ctx->spawn, alg, inst,
 357                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 358         if (err)
 359                 goto out_free_inst;
 360
 361         type = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC;
 362         if (alg->cra_flags & CRYPTO_ALG_INTERNAL)
 363                 type |= CRYPTO_ALG_INTERNAL;
 364         inst->alg.cra_flags = type;
 365         inst->alg.cra_type = &crypto_ablkcipher_type;
 366
 367         inst->alg.cra_ablkcipher.ivsize = alg->cra_blkcipher.ivsize;
 368         inst->alg.cra_ablkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
 369         inst->alg.cra_ablkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
 370
 371         inst->alg.cra_ablkcipher.geniv = alg->cra_blkcipher.geniv;
 372
 373         inst->alg.cra_ctxsize = sizeof(struct cryptd_blkcipher_ctx);
 374
 375         inst->alg.cra_init = cryptd_blkcipher_init_tfm;
 376         inst->alg.cra_exit = cryptd_blkcipher_exit_tfm;
 377
 378         inst->alg.cra_ablkcipher.setkey = cryptd_blkcipher_setkey;
 379         inst->alg.cra_ablkcipher.encrypt = cryptd_blkcipher_encrypt_enqueue;
 380         inst->alg.cra_ablkcipher.decrypt = cryptd_blkcipher_decrypt_enqueue;
 381
 382         err = crypto_register_instance(tmpl, inst);
 383         if (err) {
 384                 crypto_drop_spawn(&ctx->spawn);
 385 out_free_inst:
 386                 kfree(inst);
 387         }
 388
 389 out_put_alg:
 390         crypto_mod_put(alg);
 391         return err;
 392 }
 393
 394 static int cryptd_hash_init_tfm(struct crypto_tfm *tfm)
 395 {
 396         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 397         struct hashd_instance_ctx *ictx = crypto_instance_ctx(inst);
 398         struct crypto_shash_spawn *spawn = &ictx->spawn;
 399         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 400         struct crypto_shash *hash;
 401
 402         hash = crypto_spawn_shash(spawn);
 403         if (IS_ERR(hash))
 404                 return PTR_ERR(hash);
 405
 406         ctx->child = hash;
 407         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 408                                  sizeof(struct cryptd_hash_request_ctx) +
 409                                  crypto_shash_descsize(hash));
 410         return 0;
 411 }
 412
 413 static void cryptd_hash_exit_tfm(struct crypto_tfm *tfm)
 414 {
 415         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 416
 417         crypto_free_shash(ctx->child);
 418 }
 419
 420 static int cryptd_hash_setkey(struct crypto_ahash *parent,
 421                                    const u8 *key, unsigned int keylen)
 422 {
 423         struct cryptd_hash_ctx *ctx   = crypto_ahash_ctx(parent);
 424         struct crypto_shash *child = ctx->child;
 425         int err;
 426
 427         crypto_shash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 428         crypto_shash_set_flags(child, crypto_ahash_get_flags(parent) &
 429                                       CRYPTO_TFM_REQ_MASK);
 430         err = crypto_shash_setkey(child, key, keylen);
 431         crypto_ahash_set_flags(parent, crypto_shash_get_flags(child) &
 432                                        CRYPTO_TFM_RES_MASK);
 433         return err;
 434 }
 435
 436 static int cryptd_hash_enqueue(struct ahash_request *req,
 437                                 crypto_completion_t compl)
 438 {
 439         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 440         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 441         struct cryptd_queue *queue =
 442                 cryptd_get_queue(crypto_ahash_tfm(tfm));
 443
 444         rctx->complete = req->base.complete;
 445         req->base.complete = compl;
 446
 447         return cryptd_enqueue_request(queue, &req->base);
 448 }
 449
 450 static void cryptd_hash_init(struct crypto_async_request *req_async, int err)
 451 {
 452         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 453         struct crypto_shash *child = ctx->child;
 454         struct ahash_request *req = ahash_request_cast(req_async);
 455         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 456         struct shash_desc *desc = &rctx->desc;
 457
 458         if (unlikely(err == -EINPROGRESS))
 459                 goto out;
 460
 461         desc->tfm = child;
 462         desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 463
 464         err = crypto_shash_init(desc);
 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_init_enqueue(struct ahash_request *req)
 475 {
 476         return cryptd_hash_enqueue(req, cryptd_hash_init);
 477 }
 478
 479 static void cryptd_hash_update(struct crypto_async_request *req_async, int err)
 480 {
 481         struct ahash_request *req = ahash_request_cast(req_async);
 482         struct cryptd_hash_request_ctx *rctx;
 483
 484         rctx = ahash_request_ctx(req);
 485
 486         if (unlikely(err == -EINPROGRESS))
 487                 goto out;
 488
 489         err = shash_ahash_update(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_update_enqueue(struct ahash_request *req)
 500 {
 501         return cryptd_hash_enqueue(req, cryptd_hash_update);
 502 }
 503
 504 static void cryptd_hash_final(struct crypto_async_request *req_async, int err)
 505 {
 506         struct ahash_request *req = ahash_request_cast(req_async);
 507         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 508
 509         if (unlikely(err == -EINPROGRESS))
 510                 goto out;
 511
 512         err = crypto_shash_final(&rctx->desc, req->result);
 513
 514         req->base.complete = rctx->complete;
 515
 516 out:
 517         local_bh_disable();
 518         rctx->complete(&req->base, err);
 519         local_bh_enable();
 520 }
 521
 522 static int cryptd_hash_final_enqueue(struct ahash_request *req)
 523 {
 524         return cryptd_hash_enqueue(req, cryptd_hash_final);
 525 }
 526
 527 static void cryptd_hash_finup(struct crypto_async_request *req_async, int err)
 528 {
 529         struct ahash_request *req = ahash_request_cast(req_async);
 530         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 531
 532         if (unlikely(err == -EINPROGRESS))
 533                 goto out;
 534
 535         err = shash_ahash_finup(req, &rctx->desc);
 536
 537         req->base.complete = rctx->complete;
 538
 539 out:
 540         local_bh_disable();
 541         rctx->complete(&req->base, err);
 542         local_bh_enable();
 543 }
 544
 545 static int cryptd_hash_finup_enqueue(struct ahash_request *req)
 546 {
 547         return cryptd_hash_enqueue(req, cryptd_hash_finup);
 548 }
 549
 550 static void cryptd_hash_digest(struct crypto_async_request *req_async, int err)
 551 {
 552         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 553         struct crypto_shash *child = ctx->child;
 554         struct ahash_request *req = ahash_request_cast(req_async);
 555         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 556         struct shash_desc *desc = &rctx->desc;
 557
 558         if (unlikely(err == -EINPROGRESS))
 559                 goto out;
 560
 561         desc->tfm = child;
 562         desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 563
 564         err = shash_ahash_digest(req, desc);
 565
 566         req->base.complete = rctx->complete;
 567
 568 out:
 569         local_bh_disable();
 570         rctx->complete(&req->base, err);
 571         local_bh_enable();
 572 }
 573
 574 static int cryptd_hash_digest_enqueue(struct ahash_request *req)
 575 {
 576         return cryptd_hash_enqueue(req, cryptd_hash_digest);
 577 }
 578
 579 static int cryptd_hash_export(struct ahash_request *req, void *out)
 580 {
 581         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 582
 583         return crypto_shash_export(&rctx->desc, out);
 584 }
 585
 586 static int cryptd_hash_import(struct ahash_request *req, const void *in)
 587 {
 588         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 589
 590         return crypto_shash_import(&rctx->desc, in);
 591 }
 592
 593 static int cryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,
 594                               struct cryptd_queue *queue)
 595 {
 596         struct hashd_instance_ctx *ctx;
 597         struct ahash_instance *inst;
 598         struct shash_alg *salg;
 599         struct crypto_alg *alg;
 600         u32 type = 0;
 601         u32 mask = 0;
 602         int err;
 603
 604         cryptd_check_internal(tb, &type, &mask);
 605
 606         salg = shash_attr_alg(tb[1], type, mask);
 607         if (IS_ERR(salg))
 608                 return PTR_ERR(salg);
 609
 610         alg = &salg->base;
 611         inst = cryptd_alloc_instance(alg, ahash_instance_headroom(),
 612                                      sizeof(*ctx));
 613         err = PTR_ERR(inst);
 614         if (IS_ERR(inst))
 615                 goto out_put_alg;
 616
 617         ctx = ahash_instance_ctx(inst);
 618         ctx->queue = queue;
 619
 620         err = crypto_init_shash_spawn(&ctx->spawn, salg,
 621                                       ahash_crypto_instance(inst));
 622         if (err)
 623                 goto out_free_inst;
 624
 625         type = CRYPTO_ALG_ASYNC;
 626         if (alg->cra_flags & CRYPTO_ALG_INTERNAL)
 627                 type |= CRYPTO_ALG_INTERNAL;
 628         inst->alg.halg.base.cra_flags = type;
 629
 630         inst->alg.halg.digestsize = salg->digestsize;
 631         inst->alg.halg.base.cra_ctxsize = sizeof(struct cryptd_hash_ctx);
 632
 633         inst->alg.halg.base.cra_init = cryptd_hash_init_tfm;
 634         inst->alg.halg.base.cra_exit = cryptd_hash_exit_tfm;
 635
 636         inst->alg.init   = cryptd_hash_init_enqueue;
 637         inst->alg.update = cryptd_hash_update_enqueue;
 638         inst->alg.final  = cryptd_hash_final_enqueue;
 639         inst->alg.finup  = cryptd_hash_finup_enqueue;
 640         inst->alg.export = cryptd_hash_export;
 641         inst->alg.import = cryptd_hash_import;
 642         inst->alg.setkey = cryptd_hash_setkey;
 643         inst->alg.digest = cryptd_hash_digest_enqueue;
 644
 645         err = ahash_register_instance(tmpl, inst);
 646         if (err) {
 647                 crypto_drop_shash(&ctx->spawn);
 648 out_free_inst:
 649                 kfree(inst);
 650         }
 651
 652 out_put_alg:
 653         crypto_mod_put(alg);
 654         return err;
 655 }
 656
 657 static void cryptd_aead_crypt(struct aead_request *req,
 658                         struct crypto_aead *child,
 659                         int err,
 660                         int (*crypt)(struct aead_request *req))
 661 {
 662         struct cryptd_aead_request_ctx *rctx;
 663         rctx = aead_request_ctx(req);
 664
 665         if (unlikely(err == -EINPROGRESS))
 666                 goto out;
 667         aead_request_set_tfm(req, child);
 668         err = crypt( req );
 669         req->base.complete = rctx->complete;
 670 out:
 671         local_bh_disable();
 672         rctx->complete(&req->base, err);
 673         local_bh_enable();
 674 }
 675
 676 static void cryptd_aead_encrypt(struct crypto_async_request *areq, int err)
 677 {
 678         struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm);
 679         struct crypto_aead *child = ctx->child;
 680         struct aead_request *req;
 681
 682         req = container_of(areq, struct aead_request, base);
 683         cryptd_aead_crypt(req, child, err, crypto_aead_crt(child)->encrypt);
 684 }
 685
 686 static void cryptd_aead_decrypt(struct crypto_async_request *areq, int err)
 687 {
 688         struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm);
 689         struct crypto_aead *child = ctx->child;
 690         struct aead_request *req;
 691
 692         req = container_of(areq, struct aead_request, base);
 693         cryptd_aead_crypt(req, child, err, crypto_aead_crt(child)->decrypt);
 694 }
 695
 696 static int cryptd_aead_enqueue(struct aead_request *req,
 697                                     crypto_completion_t compl)
 698 {
 699         struct cryptd_aead_request_ctx *rctx = aead_request_ctx(req);
 700         struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 701         struct cryptd_queue *queue = cryptd_get_queue(crypto_aead_tfm(tfm));
 702
 703         rctx->complete = req->base.complete;
 704         req->base.complete = compl;
 705         return cryptd_enqueue_request(queue, &req->base);
 706 }
 707
 708 static int cryptd_aead_encrypt_enqueue(struct aead_request *req)
 709 {
 710         return cryptd_aead_enqueue(req, cryptd_aead_encrypt );
 711 }
 712
 713 static int cryptd_aead_decrypt_enqueue(struct aead_request *req)
 714 {
 715         return cryptd_aead_enqueue(req, cryptd_aead_decrypt );
 716 }
 717
 718 static int cryptd_aead_init_tfm(struct crypto_tfm *tfm)
 719 {
 720         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 721         struct aead_instance_ctx *ictx = crypto_instance_ctx(inst);
 722         struct crypto_aead_spawn *spawn = &ictx->aead_spawn;
 723         struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(tfm);
 724         struct crypto_aead *cipher;
 725
 726         cipher = crypto_spawn_aead(spawn);
 727         if (IS_ERR(cipher))
 728                 return PTR_ERR(cipher);
 729
 730         crypto_aead_set_flags(cipher, CRYPTO_TFM_REQ_MAY_SLEEP);
 731         ctx->child = cipher;
 732         tfm->crt_aead.reqsize = sizeof(struct cryptd_aead_request_ctx);
 733         return 0;
 734 }
 735
 736 static void cryptd_aead_exit_tfm(struct crypto_tfm *tfm)
 737 {
 738         struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(tfm);
 739         crypto_free_aead(ctx->child);
 740 }
 741
 742 static int cryptd_create_aead(struct crypto_template *tmpl,
 743                               struct rtattr **tb,
 744                               struct cryptd_queue *queue)
 745 {
 746         struct aead_instance_ctx *ctx;
 747         struct crypto_instance *inst;
 748         struct crypto_alg *alg;
 749         u32 type = CRYPTO_ALG_TYPE_AEAD;
 750         u32 mask = CRYPTO_ALG_TYPE_MASK;
 751         int err;
 752
 753         cryptd_check_internal(tb, &type, &mask);
 754
 755         alg = crypto_get_attr_alg(tb, type, mask);
 756         if (IS_ERR(alg))
 757                 return PTR_ERR(alg);
 758
 759         inst = cryptd_alloc_instance(alg, 0, sizeof(*ctx));
 760         err = PTR_ERR(inst);
 761         if (IS_ERR(inst))
 762                 goto out_put_alg;
 763
 764         ctx = crypto_instance_ctx(inst);
 765         ctx->queue = queue;
 766
 767         err = crypto_init_spawn(&ctx->aead_spawn.base, alg, inst,
 768                         CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 769         if (err)
 770                 goto out_free_inst;
 771
 772         type = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC;
 773         if (alg->cra_flags & CRYPTO_ALG_INTERNAL)
 774                 type |= CRYPTO_ALG_INTERNAL;
 775         inst->alg.cra_flags = type;
 776         inst->alg.cra_type = alg->cra_type;
 777         inst->alg.cra_ctxsize = sizeof(struct cryptd_aead_ctx);
 778         inst->alg.cra_init = cryptd_aead_init_tfm;
 779         inst->alg.cra_exit = cryptd_aead_exit_tfm;
 780         inst->alg.cra_aead.setkey      = alg->cra_aead.setkey;
 781         inst->alg.cra_aead.setauthsize = alg->cra_aead.setauthsize;
 782         inst->alg.cra_aead.geniv       = alg->cra_aead.geniv;
 783         inst->alg.cra_aead.ivsize      = alg->cra_aead.ivsize;
 784         inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize;
 785         inst->alg.cra_aead.encrypt     = cryptd_aead_encrypt_enqueue;
 786         inst->alg.cra_aead.decrypt     = cryptd_aead_decrypt_enqueue;
 787         inst->alg.cra_aead.givencrypt  = alg->cra_aead.givencrypt;
 788         inst->alg.cra_aead.givdecrypt  = alg->cra_aead.givdecrypt;
 789
 790         err = crypto_register_instance(tmpl, inst);
 791         if (err) {
 792                 crypto_drop_spawn(&ctx->aead_spawn.base);
 793 out_free_inst:
 794                 kfree(inst);
 795         }
 796 out_put_alg:
 797         crypto_mod_put(alg);
 798         return err;
 799 }
 800
 801 static struct cryptd_queue queue;
 802
 803 static int cryptd_create(struct crypto_template *tmpl, struct rtattr **tb)
 804 {
 805         struct crypto_attr_type *algt;
 806
 807         algt = crypto_get_attr_type(tb);
 808         if (IS_ERR(algt))
 809                 return PTR_ERR(algt);
 810
 811         switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
 812         case CRYPTO_ALG_TYPE_BLKCIPHER:
 813                 return cryptd_create_blkcipher(tmpl, tb, &queue);
 814         case CRYPTO_ALG_TYPE_DIGEST:
 815                 return cryptd_create_hash(tmpl, tb, &queue);
 816         case CRYPTO_ALG_TYPE_AEAD:
 817                 return cryptd_create_aead(tmpl, tb, &queue);
 818         }
 819
 820         return -EINVAL;
 821 }
 822
 823 static void cryptd_free(struct crypto_instance *inst)
 824 {
 825         struct cryptd_instance_ctx *ctx = crypto_instance_ctx(inst);
 826         struct hashd_instance_ctx *hctx = crypto_instance_ctx(inst);
 827         struct aead_instance_ctx *aead_ctx = crypto_instance_ctx(inst);
 828
 829         switch (inst->alg.cra_flags & CRYPTO_ALG_TYPE_MASK) {
 830         case CRYPTO_ALG_TYPE_AHASH:
 831                 crypto_drop_shash(&hctx->spawn);
 832                 kfree(ahash_instance(inst));
 833                 return;
 834         case CRYPTO_ALG_TYPE_AEAD:
 835                 crypto_drop_spawn(&aead_ctx->aead_spawn.base);
 836                 kfree(inst);
 837                 return;
 838         default:
 839                 crypto_drop_spawn(&ctx->spawn);
 840                 kfree(inst);
 841         }
 842 }
 843
 844 static struct crypto_template cryptd_tmpl = {
 845         .name = "cryptd",
 846         .create = cryptd_create,
 847         .free = cryptd_free,
 848         .module = THIS_MODULE,
 849 };
 850
 851 struct cryptd_ablkcipher *cryptd_alloc_ablkcipher(const char *alg_name,
 852                                                   u32 type, u32 mask)
 853 {
 854         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 855         struct crypto_tfm *tfm;
 856
 857         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 858                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 859                 return ERR_PTR(-EINVAL);
 860         type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
 861         type |= CRYPTO_ALG_TYPE_BLKCIPHER;
 862         mask &= ~CRYPTO_ALG_TYPE_MASK;
 863         mask |= (CRYPTO_ALG_GENIV | CRYPTO_ALG_TYPE_BLKCIPHER_MASK);
 864         tfm = crypto_alloc_base(cryptd_alg_name, type, mask);
 865         if (IS_ERR(tfm))
 866                 return ERR_CAST(tfm);
 867         if (tfm->__crt_alg->cra_module != THIS_MODULE) {
 868                 crypto_free_tfm(tfm);
 869                 return ERR_PTR(-EINVAL);
 870         }
 871
 872         return __cryptd_ablkcipher_cast(__crypto_ablkcipher_cast(tfm));
 873 }
 874 EXPORT_SYMBOL_GPL(cryptd_alloc_ablkcipher);
 875
 876 struct crypto_blkcipher *cryptd_ablkcipher_child(struct cryptd_ablkcipher *tfm)
 877 {
 878         struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(&tfm->base);
 879         return ctx->child;
 880 }
 881 EXPORT_SYMBOL_GPL(cryptd_ablkcipher_child);
 882
 883 void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm)
 884 {
 885         crypto_free_ablkcipher(&tfm->base);
 886 }
 887 EXPORT_SYMBOL_GPL(cryptd_free_ablkcipher);
 888
 889 struct cryptd_ahash *cryptd_alloc_ahash(const char *alg_name,
 890                                         u32 type, u32 mask)
 891 {
 892         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 893         struct crypto_ahash *tfm;
 894
 895         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 896                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 897                 return ERR_PTR(-EINVAL);
 898         tfm = crypto_alloc_ahash(cryptd_alg_name, type, mask);
 899         if (IS_ERR(tfm))
 900                 return ERR_CAST(tfm);
 901         if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
 902                 crypto_free_ahash(tfm);
 903                 return ERR_PTR(-EINVAL);
 904         }
 905
 906         return __cryptd_ahash_cast(tfm);
 907 }
 908 EXPORT_SYMBOL_GPL(cryptd_alloc_ahash);
 909
 910 struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm)
 911 {
 912         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
 913
 914         return ctx->child;
 915 }
 916 EXPORT_SYMBOL_GPL(cryptd_ahash_child);
 917
 918 struct shash_desc *cryptd_shash_desc(struct ahash_request *req)
 919 {
 920         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 921         return &rctx->desc;
 922 }
 923 EXPORT_SYMBOL_GPL(cryptd_shash_desc);
 924
 925 void cryptd_free_ahash(struct cryptd_ahash *tfm)
 926 {
 927         crypto_free_ahash(&tfm->base);
 928 }
 929 EXPORT_SYMBOL_GPL(cryptd_free_ahash);
 930
 931 struct cryptd_aead *cryptd_alloc_aead(const char *alg_name,
 932                                                   u32 type, u32 mask)
 933 {
 934         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 935         struct crypto_aead *tfm;
 936
 937         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 938                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 939                 return ERR_PTR(-EINVAL);
 940         tfm = crypto_alloc_aead(cryptd_alg_name, type, mask);
 941         if (IS_ERR(tfm))
 942                 return ERR_CAST(tfm);
 943         if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
 944                 crypto_free_aead(tfm);
 945                 return ERR_PTR(-EINVAL);
 946         }
 947         return __cryptd_aead_cast(tfm);
 948 }
 949 EXPORT_SYMBOL_GPL(cryptd_alloc_aead);
 950
 951 struct crypto_aead *cryptd_aead_child(struct cryptd_aead *tfm)
 952 {
 953         struct cryptd_aead_ctx *ctx;
 954         ctx = crypto_aead_ctx(&tfm->base);
 955         return ctx->child;
 956 }
 957 EXPORT_SYMBOL_GPL(cryptd_aead_child);
 958
 959 void cryptd_free_aead(struct cryptd_aead *tfm)
 960 {
 961         crypto_free_aead(&tfm->base);
 962 }
 963 EXPORT_SYMBOL_GPL(cryptd_free_aead);
 964
 965 static int __init cryptd_init(void)
 966 {
 967         int err;
 968
 969         err = cryptd_init_queue(&queue, CRYPTD_MAX_CPU_QLEN);
 970         if (err)
 971                 return err;
 972
 973         err = crypto_register_template(&cryptd_tmpl);
 974         if (err)
 975                 cryptd_fini_queue(&queue);
 976
 977         return err;
 978 }
 979
 980 static void __exit cryptd_exit(void)
 981 {
 982         cryptd_fini_queue(&queue);
 983         crypto_unregister_template(&cryptd_tmpl);
 984 }
 985
 986 subsys_initcall(cryptd_init);
 987 module_exit(cryptd_exit);
 988
 989 MODULE_LICENSE("GPL");
 990 MODULE_DESCRIPTION("Software async crypto daemon");
 991 MODULE_ALIAS_CRYPTO("cryptd");