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
 180         *type |= algt->type & CRYPTO_ALG_INTERNAL;
 181         *mask |= algt->mask & CRYPTO_ALG_INTERNAL;
 182 }
 183
 184 static int cryptd_blkcipher_setkey(struct crypto_ablkcipher *parent,
 185                                    const u8 *key, unsigned int keylen)
 186 {
 187         struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(parent);
 188         struct crypto_blkcipher *child = ctx->child;
 189         int err;
 190
 191         crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 192         crypto_blkcipher_set_flags(child, crypto_ablkcipher_get_flags(parent) &
 193                                           CRYPTO_TFM_REQ_MASK);
 194         err = crypto_blkcipher_setkey(child, key, keylen);
 195         crypto_ablkcipher_set_flags(parent, crypto_blkcipher_get_flags(child) &
 196                                             CRYPTO_TFM_RES_MASK);
 197         return err;
 198 }
 199
 200 static void cryptd_blkcipher_crypt(struct ablkcipher_request *req,
 201                                    struct crypto_blkcipher *child,
 202                                    int err,
 203                                    int (*crypt)(struct blkcipher_desc *desc,
 204                                                 struct scatterlist *dst,
 205                                                 struct scatterlist *src,
 206                                                 unsigned int len))
 207 {
 208         struct cryptd_blkcipher_request_ctx *rctx;
 209         struct blkcipher_desc desc;
 210
 211         rctx = ablkcipher_request_ctx(req);
 212
 213         if (unlikely(err == -EINPROGRESS))
 214                 goto out;
 215
 216         desc.tfm = child;
 217         desc.info = req->info;
 218         desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 219
 220         err = crypt(&desc, req->dst, req->src, req->nbytes);
 221
 222         req->base.complete = rctx->complete;
 223
 224 out:
 225         local_bh_disable();
 226         rctx->complete(&req->base, err);
 227         local_bh_enable();
 228 }
 229
 230 static void cryptd_blkcipher_encrypt(struct crypto_async_request *req, int err)
 231 {
 232         struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
 233         struct crypto_blkcipher *child = ctx->child;
 234
 235         cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
 236                                crypto_blkcipher_crt(child)->encrypt);
 237 }
 238
 239 static void cryptd_blkcipher_decrypt(struct crypto_async_request *req, int err)
 240 {
 241         struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
 242         struct crypto_blkcipher *child = ctx->child;
 243
 244         cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
 245                                crypto_blkcipher_crt(child)->decrypt);
 246 }
 247
 248 static int cryptd_blkcipher_enqueue(struct ablkcipher_request *req,
 249                                     crypto_completion_t compl)
 250 {
 251         struct cryptd_blkcipher_request_ctx *rctx = ablkcipher_request_ctx(req);
 252         struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
 253         struct cryptd_queue *queue;
 254
 255         queue = cryptd_get_queue(crypto_ablkcipher_tfm(tfm));
 256         rctx->complete = req->base.complete;
 257         req->base.complete = compl;
 258
 259         return cryptd_enqueue_request(queue, &req->base);
 260 }
 261
 262 static int cryptd_blkcipher_encrypt_enqueue(struct ablkcipher_request *req)
 263 {
 264         return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_encrypt);
 265 }
 266
 267 static int cryptd_blkcipher_decrypt_enqueue(struct ablkcipher_request *req)
 268 {
 269         return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_decrypt);
 270 }
 271
 272 static int cryptd_blkcipher_init_tfm(struct crypto_tfm *tfm)
 273 {
 274         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 275         struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
 276         struct crypto_spawn *spawn = &ictx->spawn;
 277         struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
 278         struct crypto_blkcipher *cipher;
 279
 280         cipher = crypto_spawn_blkcipher(spawn);
 281         if (IS_ERR(cipher))
 282                 return PTR_ERR(cipher);
 283
 284         ctx->child = cipher;
 285         tfm->crt_ablkcipher.reqsize =
 286                 sizeof(struct cryptd_blkcipher_request_ctx);
 287         return 0;
 288 }
 289
 290 static void cryptd_blkcipher_exit_tfm(struct crypto_tfm *tfm)
 291 {
 292         struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
 293
 294         crypto_free_blkcipher(ctx->child);
 295 }
 296
 297 static int cryptd_init_instance(struct crypto_instance *inst,
 298                                 struct crypto_alg *alg)
 299 {
 300         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 301                      "cryptd(%s)",
 302                      alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 303                 return -ENAMETOOLONG;
 304
 305         memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
 306
 307         inst->alg.cra_priority = alg->cra_priority + 50;
 308         inst->alg.cra_blocksize = alg->cra_blocksize;
 309         inst->alg.cra_alignmask = alg->cra_alignmask;
 310
 311         return 0;
 312 }
 313
 314 static void *cryptd_alloc_instance(struct crypto_alg *alg, unsigned int head,
 315                                    unsigned int tail)
 316 {
 317         char *p;
 318         struct crypto_instance *inst;
 319         int err;
 320
 321         p = kzalloc(head + sizeof(*inst) + tail, GFP_KERNEL);
 322         if (!p)
 323                 return ERR_PTR(-ENOMEM);
 324
 325         inst = (void *)(p + head);
 326
 327         err = cryptd_init_instance(inst, alg);
 328         if (err)
 329                 goto out_free_inst;
 330
 331 out:
 332         return p;
 333
 334 out_free_inst:
 335         kfree(p);
 336         p = ERR_PTR(err);
 337         goto out;
 338 }
 339
 340 static int cryptd_create_blkcipher(struct crypto_template *tmpl,
 341                                    struct rtattr **tb,
 342                                    struct cryptd_queue *queue)
 343 {
 344         struct cryptd_instance_ctx *ctx;
 345         struct crypto_instance *inst;
 346         struct crypto_alg *alg;
 347         u32 type = CRYPTO_ALG_TYPE_BLKCIPHER;
 348         u32 mask = CRYPTO_ALG_TYPE_MASK;
 349         int err;
 350
 351         cryptd_check_internal(tb, &type, &mask);
 352
 353         alg = crypto_get_attr_alg(tb, type, mask);
 354         if (IS_ERR(alg))
 355                 return PTR_ERR(alg);
 356
 357         inst = cryptd_alloc_instance(alg, 0, sizeof(*ctx));
 358         err = PTR_ERR(inst);
 359         if (IS_ERR(inst))
 360                 goto out_put_alg;
 361
 362         ctx = crypto_instance_ctx(inst);
 363         ctx->queue = queue;
 364
 365         err = crypto_init_spawn(&ctx->spawn, alg, inst,
 366                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 367         if (err)
 368                 goto out_free_inst;
 369
 370         type = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC;
 371         if (alg->cra_flags & CRYPTO_ALG_INTERNAL)
 372                 type |= CRYPTO_ALG_INTERNAL;
 373         inst->alg.cra_flags = type;
 374         inst->alg.cra_type = &crypto_ablkcipher_type;
 375
 376         inst->alg.cra_ablkcipher.ivsize = alg->cra_blkcipher.ivsize;
 377         inst->alg.cra_ablkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
 378         inst->alg.cra_ablkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
 379
 380         inst->alg.cra_ablkcipher.geniv = alg->cra_blkcipher.geniv;
 381
 382         inst->alg.cra_ctxsize = sizeof(struct cryptd_blkcipher_ctx);
 383
 384         inst->alg.cra_init = cryptd_blkcipher_init_tfm;
 385         inst->alg.cra_exit = cryptd_blkcipher_exit_tfm;
 386
 387         inst->alg.cra_ablkcipher.setkey = cryptd_blkcipher_setkey;
 388         inst->alg.cra_ablkcipher.encrypt = cryptd_blkcipher_encrypt_enqueue;
 389         inst->alg.cra_ablkcipher.decrypt = cryptd_blkcipher_decrypt_enqueue;
 390
 391         err = crypto_register_instance(tmpl, inst);
 392         if (err) {
 393                 crypto_drop_spawn(&ctx->spawn);
 394 out_free_inst:
 395                 kfree(inst);
 396         }
 397
 398 out_put_alg:
 399         crypto_mod_put(alg);
 400         return err;
 401 }
 402
 403 static int cryptd_hash_init_tfm(struct crypto_tfm *tfm)
 404 {
 405         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 406         struct hashd_instance_ctx *ictx = crypto_instance_ctx(inst);
 407         struct crypto_shash_spawn *spawn = &ictx->spawn;
 408         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 409         struct crypto_shash *hash;
 410
 411         hash = crypto_spawn_shash(spawn);
 412         if (IS_ERR(hash))
 413                 return PTR_ERR(hash);
 414
 415         ctx->child = hash;
 416         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 417                                  sizeof(struct cryptd_hash_request_ctx) +
 418                                  crypto_shash_descsize(hash));
 419         return 0;
 420 }
 421
 422 static void cryptd_hash_exit_tfm(struct crypto_tfm *tfm)
 423 {
 424         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 425
 426         crypto_free_shash(ctx->child);
 427 }
 428
 429 static int cryptd_hash_setkey(struct crypto_ahash *parent,
 430                                    const u8 *key, unsigned int keylen)
 431 {
 432         struct cryptd_hash_ctx *ctx   = crypto_ahash_ctx(parent);
 433         struct crypto_shash *child = ctx->child;
 434         int err;
 435
 436         crypto_shash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 437         crypto_shash_set_flags(child, crypto_ahash_get_flags(parent) &
 438                                       CRYPTO_TFM_REQ_MASK);
 439         err = crypto_shash_setkey(child, key, keylen);
 440         crypto_ahash_set_flags(parent, crypto_shash_get_flags(child) &
 441                                        CRYPTO_TFM_RES_MASK);
 442         return err;
 443 }
 444
 445 static int cryptd_hash_enqueue(struct ahash_request *req,
 446                                 crypto_completion_t compl)
 447 {
 448         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 449         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 450         struct cryptd_queue *queue =
 451                 cryptd_get_queue(crypto_ahash_tfm(tfm));
 452
 453         rctx->complete = req->base.complete;
 454         req->base.complete = compl;
 455
 456         return cryptd_enqueue_request(queue, &req->base);
 457 }
 458
 459 static void cryptd_hash_init(struct crypto_async_request *req_async, int err)
 460 {
 461         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 462         struct crypto_shash *child = ctx->child;
 463         struct ahash_request *req = ahash_request_cast(req_async);
 464         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 465         struct shash_desc *desc = &rctx->desc;
 466
 467         if (unlikely(err == -EINPROGRESS))
 468                 goto out;
 469
 470         desc->tfm = child;
 471         desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 472
 473         err = crypto_shash_init(desc);
 474
 475         req->base.complete = rctx->complete;
 476
 477 out:
 478         local_bh_disable();
 479         rctx->complete(&req->base, err);
 480         local_bh_enable();
 481 }
 482
 483 static int cryptd_hash_init_enqueue(struct ahash_request *req)
 484 {
 485         return cryptd_hash_enqueue(req, cryptd_hash_init);
 486 }
 487
 488 static void cryptd_hash_update(struct crypto_async_request *req_async, int err)
 489 {
 490         struct ahash_request *req = ahash_request_cast(req_async);
 491         struct cryptd_hash_request_ctx *rctx;
 492
 493         rctx = ahash_request_ctx(req);
 494
 495         if (unlikely(err == -EINPROGRESS))
 496                 goto out;
 497
 498         err = shash_ahash_update(req, &rctx->desc);
 499
 500         req->base.complete = rctx->complete;
 501
 502 out:
 503         local_bh_disable();
 504         rctx->complete(&req->base, err);
 505         local_bh_enable();
 506 }
 507
 508 static int cryptd_hash_update_enqueue(struct ahash_request *req)
 509 {
 510         return cryptd_hash_enqueue(req, cryptd_hash_update);
 511 }
 512
 513 static void cryptd_hash_final(struct crypto_async_request *req_async, int err)
 514 {
 515         struct ahash_request *req = ahash_request_cast(req_async);
 516         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 517
 518         if (unlikely(err == -EINPROGRESS))
 519                 goto out;
 520
 521         err = crypto_shash_final(&rctx->desc, req->result);
 522
 523         req->base.complete = rctx->complete;
 524
 525 out:
 526         local_bh_disable();
 527         rctx->complete(&req->base, err);
 528         local_bh_enable();
 529 }
 530
 531 static int cryptd_hash_final_enqueue(struct ahash_request *req)
 532 {
 533         return cryptd_hash_enqueue(req, cryptd_hash_final);
 534 }
 535
 536 static void cryptd_hash_finup(struct crypto_async_request *req_async, int err)
 537 {
 538         struct ahash_request *req = ahash_request_cast(req_async);
 539         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 540
 541         if (unlikely(err == -EINPROGRESS))
 542                 goto out;
 543
 544         err = shash_ahash_finup(req, &rctx->desc);
 545
 546         req->base.complete = rctx->complete;
 547
 548 out:
 549         local_bh_disable();
 550         rctx->complete(&req->base, err);
 551         local_bh_enable();
 552 }
 553
 554 static int cryptd_hash_finup_enqueue(struct ahash_request *req)
 555 {
 556         return cryptd_hash_enqueue(req, cryptd_hash_finup);
 557 }
 558
 559 static void cryptd_hash_digest(struct crypto_async_request *req_async, int err)
 560 {
 561         struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 562         struct crypto_shash *child = ctx->child;
 563         struct ahash_request *req = ahash_request_cast(req_async);
 564         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 565         struct shash_desc *desc = &rctx->desc;
 566
 567         if (unlikely(err == -EINPROGRESS))
 568                 goto out;
 569
 570         desc->tfm = child;
 571         desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 572
 573         err = shash_ahash_digest(req, desc);
 574
 575         req->base.complete = rctx->complete;
 576
 577 out:
 578         local_bh_disable();
 579         rctx->complete(&req->base, err);
 580         local_bh_enable();
 581 }
 582
 583 static int cryptd_hash_digest_enqueue(struct ahash_request *req)
 584 {
 585         return cryptd_hash_enqueue(req, cryptd_hash_digest);
 586 }
 587
 588 static int cryptd_hash_export(struct ahash_request *req, void *out)
 589 {
 590         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 591
 592         return crypto_shash_export(&rctx->desc, out);
 593 }
 594
 595 static int cryptd_hash_import(struct ahash_request *req, const void *in)
 596 {
 597         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 598
 599         return crypto_shash_import(&rctx->desc, in);
 600 }
 601
 602 static int cryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,
 603                               struct cryptd_queue *queue)
 604 {
 605         struct hashd_instance_ctx *ctx;
 606         struct ahash_instance *inst;
 607         struct shash_alg *salg;
 608         struct crypto_alg *alg;
 609         u32 type = 0;
 610         u32 mask = 0;
 611         int err;
 612
 613         cryptd_check_internal(tb, &type, &mask);
 614
 615         salg = shash_attr_alg(tb[1], type, mask);
 616         if (IS_ERR(salg))
 617                 return PTR_ERR(salg);
 618
 619         alg = &salg->base;
 620         inst = cryptd_alloc_instance(alg, ahash_instance_headroom(),
 621                                      sizeof(*ctx));
 622         err = PTR_ERR(inst);
 623         if (IS_ERR(inst))
 624                 goto out_put_alg;
 625
 626         ctx = ahash_instance_ctx(inst);
 627         ctx->queue = queue;
 628
 629         err = crypto_init_shash_spawn(&ctx->spawn, salg,
 630                                       ahash_crypto_instance(inst));
 631         if (err)
 632                 goto out_free_inst;
 633
 634         type = CRYPTO_ALG_ASYNC;
 635         if (alg->cra_flags & CRYPTO_ALG_INTERNAL)
 636                 type |= CRYPTO_ALG_INTERNAL;
 637         inst->alg.halg.base.cra_flags = type;
 638
 639         inst->alg.halg.digestsize = salg->digestsize;
 640         inst->alg.halg.base.cra_ctxsize = sizeof(struct cryptd_hash_ctx);
 641
 642         inst->alg.halg.base.cra_init = cryptd_hash_init_tfm;
 643         inst->alg.halg.base.cra_exit = cryptd_hash_exit_tfm;
 644
 645         inst->alg.init   = cryptd_hash_init_enqueue;
 646         inst->alg.update = cryptd_hash_update_enqueue;
 647         inst->alg.final  = cryptd_hash_final_enqueue;
 648         inst->alg.finup  = cryptd_hash_finup_enqueue;
 649         inst->alg.export = cryptd_hash_export;
 650         inst->alg.import = cryptd_hash_import;
 651         inst->alg.setkey = cryptd_hash_setkey;
 652         inst->alg.digest = cryptd_hash_digest_enqueue;
 653
 654         err = ahash_register_instance(tmpl, inst);
 655         if (err) {
 656                 crypto_drop_shash(&ctx->spawn);
 657 out_free_inst:
 658                 kfree(inst);
 659         }
 660
 661 out_put_alg:
 662         crypto_mod_put(alg);
 663         return err;
 664 }
 665
 666 static int cryptd_aead_setkey(struct crypto_aead *parent,
 667                               const u8 *key, unsigned int keylen)
 668 {
 669         struct cryptd_aead_ctx *ctx = crypto_aead_ctx(parent);
 670         struct crypto_aead *child = ctx->child;
 671
 672         return crypto_aead_setkey(child, key, keylen);
 673 }
 674
 675 static int cryptd_aead_setauthsize(struct crypto_aead *parent,
 676                                    unsigned int authsize)
 677 {
 678         struct cryptd_aead_ctx *ctx = crypto_aead_ctx(parent);
 679         struct crypto_aead *child = ctx->child;
 680
 681         return crypto_aead_setauthsize(child, authsize);
 682 }
 683
 684 static void cryptd_aead_crypt(struct aead_request *req,
 685                         struct crypto_aead *child,
 686                         int err,
 687                         int (*crypt)(struct aead_request *req))
 688 {
 689         struct cryptd_aead_request_ctx *rctx;
 690         crypto_completion_t compl;
 691
 692         rctx = aead_request_ctx(req);
 693         compl = rctx->complete;
 694
 695         if (unlikely(err == -EINPROGRESS))
 696                 goto out;
 697         aead_request_set_tfm(req, child);
 698         err = crypt( req );
 699 out:
 700         local_bh_disable();
 701         compl(&req->base, err);
 702         local_bh_enable();
 703 }
 704
 705 static void cryptd_aead_encrypt(struct crypto_async_request *areq, int err)
 706 {
 707         struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm);
 708         struct crypto_aead *child = ctx->child;
 709         struct aead_request *req;
 710
 711         req = container_of(areq, struct aead_request, base);
 712         cryptd_aead_crypt(req, child, err, crypto_aead_alg(child)->encrypt);
 713 }
 714
 715 static void cryptd_aead_decrypt(struct crypto_async_request *areq, int err)
 716 {
 717         struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm);
 718         struct crypto_aead *child = ctx->child;
 719         struct aead_request *req;
 720
 721         req = container_of(areq, struct aead_request, base);
 722         cryptd_aead_crypt(req, child, err, crypto_aead_alg(child)->decrypt);
 723 }
 724
 725 static int cryptd_aead_enqueue(struct aead_request *req,
 726                                     crypto_completion_t compl)
 727 {
 728         struct cryptd_aead_request_ctx *rctx = aead_request_ctx(req);
 729         struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 730         struct cryptd_queue *queue = cryptd_get_queue(crypto_aead_tfm(tfm));
 731
 732         rctx->complete = req->base.complete;
 733         req->base.complete = compl;
 734         return cryptd_enqueue_request(queue, &req->base);
 735 }
 736
 737 static int cryptd_aead_encrypt_enqueue(struct aead_request *req)
 738 {
 739         return cryptd_aead_enqueue(req, cryptd_aead_encrypt );
 740 }
 741
 742 static int cryptd_aead_decrypt_enqueue(struct aead_request *req)
 743 {
 744         return cryptd_aead_enqueue(req, cryptd_aead_decrypt );
 745 }
 746
 747 static int cryptd_aead_init_tfm(struct crypto_aead *tfm)
 748 {
 749         struct aead_instance *inst = aead_alg_instance(tfm);
 750         struct aead_instance_ctx *ictx = aead_instance_ctx(inst);
 751         struct crypto_aead_spawn *spawn = &ictx->aead_spawn;
 752         struct cryptd_aead_ctx *ctx = crypto_aead_ctx(tfm);
 753         struct crypto_aead *cipher;
 754
 755         cipher = crypto_spawn_aead(spawn);
 756         if (IS_ERR(cipher))
 757                 return PTR_ERR(cipher);
 758
 759         ctx->child = cipher;
 760         crypto_aead_set_reqsize(
 761                 tfm, max((unsigned)sizeof(struct cryptd_aead_request_ctx),
 762                          crypto_aead_reqsize(cipher)));
 763         return 0;
 764 }
 765
 766 static void cryptd_aead_exit_tfm(struct crypto_aead *tfm)
 767 {
 768         struct cryptd_aead_ctx *ctx = crypto_aead_ctx(tfm);
 769         crypto_free_aead(ctx->child);
 770 }
 771
 772 static int cryptd_create_aead(struct crypto_template *tmpl,
 773                               struct rtattr **tb,
 774                               struct cryptd_queue *queue)
 775 {
 776         struct aead_instance_ctx *ctx;
 777         struct aead_instance *inst;
 778         struct aead_alg *alg;
 779         const char *name;
 780         u32 type = 0;
 781         u32 mask = CRYPTO_ALG_ASYNC;
 782         int err;
 783
 784         cryptd_check_internal(tb, &type, &mask);
 785
 786         name = crypto_attr_alg_name(tb[1]);
 787         if (IS_ERR(name))
 788                 return PTR_ERR(name);
 789
 790         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 791         if (!inst)
 792                 return -ENOMEM;
 793
 794         ctx = aead_instance_ctx(inst);
 795         ctx->queue = queue;
 796
 797         crypto_set_aead_spawn(&ctx->aead_spawn, aead_crypto_instance(inst));
 798         err = crypto_grab_aead(&ctx->aead_spawn, name, type, mask);
 799         if (err)
 800                 goto out_free_inst;
 801
 802         alg = crypto_spawn_aead_alg(&ctx->aead_spawn);
 803         err = cryptd_init_instance(aead_crypto_instance(inst), &alg->base);
 804         if (err)
 805                 goto out_drop_aead;
 806
 807         inst->alg.base.cra_flags = CRYPTO_ALG_ASYNC |
 808                                    (alg->base.cra_flags & CRYPTO_ALG_INTERNAL);
 809         inst->alg.base.cra_ctxsize = sizeof(struct cryptd_aead_ctx);
 810
 811         inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
 812         inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
 813
 814         inst->alg.init = cryptd_aead_init_tfm;
 815         inst->alg.exit = cryptd_aead_exit_tfm;
 816         inst->alg.setkey = cryptd_aead_setkey;
 817         inst->alg.setauthsize = cryptd_aead_setauthsize;
 818         inst->alg.encrypt = cryptd_aead_encrypt_enqueue;
 819         inst->alg.decrypt = cryptd_aead_decrypt_enqueue;
 820
 821         err = aead_register_instance(tmpl, inst);
 822         if (err) {
 823 out_drop_aead:
 824                 crypto_drop_aead(&ctx->aead_spawn);
 825 out_free_inst:
 826                 kfree(inst);
 827         }
 828         return err;
 829 }
 830
 831 static struct cryptd_queue queue;
 832
 833 static int cryptd_create(struct crypto_template *tmpl, struct rtattr **tb)
 834 {
 835         struct crypto_attr_type *algt;
 836
 837         algt = crypto_get_attr_type(tb);
 838         if (IS_ERR(algt))
 839                 return PTR_ERR(algt);
 840
 841         switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
 842         case CRYPTO_ALG_TYPE_BLKCIPHER:
 843                 return cryptd_create_blkcipher(tmpl, tb, &queue);
 844         case CRYPTO_ALG_TYPE_DIGEST:
 845                 return cryptd_create_hash(tmpl, tb, &queue);
 846         case CRYPTO_ALG_TYPE_AEAD:
 847                 return cryptd_create_aead(tmpl, tb, &queue);
 848         }
 849
 850         return -EINVAL;
 851 }
 852
 853 static void cryptd_free(struct crypto_instance *inst)
 854 {
 855         struct cryptd_instance_ctx *ctx = crypto_instance_ctx(inst);
 856         struct hashd_instance_ctx *hctx = crypto_instance_ctx(inst);
 857         struct aead_instance_ctx *aead_ctx = crypto_instance_ctx(inst);
 858
 859         switch (inst->alg.cra_flags & CRYPTO_ALG_TYPE_MASK) {
 860         case CRYPTO_ALG_TYPE_AHASH:
 861                 crypto_drop_shash(&hctx->spawn);
 862                 kfree(ahash_instance(inst));
 863                 return;
 864         case CRYPTO_ALG_TYPE_AEAD:
 865                 crypto_drop_aead(&aead_ctx->aead_spawn);
 866                 kfree(aead_instance(inst));
 867                 return;
 868         default:
 869                 crypto_drop_spawn(&ctx->spawn);
 870                 kfree(inst);
 871         }
 872 }
 873
 874 static struct crypto_template cryptd_tmpl = {
 875         .name = "cryptd",
 876         .create = cryptd_create,
 877         .free = cryptd_free,
 878         .module = THIS_MODULE,
 879 };
 880
 881 struct cryptd_ablkcipher *cryptd_alloc_ablkcipher(const char *alg_name,
 882                                                   u32 type, u32 mask)
 883 {
 884         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 885         struct crypto_tfm *tfm;
 886
 887         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 888                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 889                 return ERR_PTR(-EINVAL);
 890         type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
 891         type |= CRYPTO_ALG_TYPE_BLKCIPHER;
 892         mask &= ~CRYPTO_ALG_TYPE_MASK;
 893         mask |= (CRYPTO_ALG_GENIV | CRYPTO_ALG_TYPE_BLKCIPHER_MASK);
 894         tfm = crypto_alloc_base(cryptd_alg_name, type, mask);
 895         if (IS_ERR(tfm))
 896                 return ERR_CAST(tfm);
 897         if (tfm->__crt_alg->cra_module != THIS_MODULE) {
 898                 crypto_free_tfm(tfm);
 899                 return ERR_PTR(-EINVAL);
 900         }
 901
 902         return __cryptd_ablkcipher_cast(__crypto_ablkcipher_cast(tfm));
 903 }
 904 EXPORT_SYMBOL_GPL(cryptd_alloc_ablkcipher);
 905
 906 struct crypto_blkcipher *cryptd_ablkcipher_child(struct cryptd_ablkcipher *tfm)
 907 {
 908         struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(&tfm->base);
 909         return ctx->child;
 910 }
 911 EXPORT_SYMBOL_GPL(cryptd_ablkcipher_child);
 912
 913 void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm)
 914 {
 915         crypto_free_ablkcipher(&tfm->base);
 916 }
 917 EXPORT_SYMBOL_GPL(cryptd_free_ablkcipher);
 918
 919 struct cryptd_ahash *cryptd_alloc_ahash(const char *alg_name,
 920                                         u32 type, u32 mask)
 921 {
 922         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 923         struct crypto_ahash *tfm;
 924
 925         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 926                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 927                 return ERR_PTR(-EINVAL);
 928         tfm = crypto_alloc_ahash(cryptd_alg_name, type, mask);
 929         if (IS_ERR(tfm))
 930                 return ERR_CAST(tfm);
 931         if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
 932                 crypto_free_ahash(tfm);
 933                 return ERR_PTR(-EINVAL);
 934         }
 935
 936         return __cryptd_ahash_cast(tfm);
 937 }
 938 EXPORT_SYMBOL_GPL(cryptd_alloc_ahash);
 939
 940 struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm)
 941 {
 942         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
 943
 944         return ctx->child;
 945 }
 946 EXPORT_SYMBOL_GPL(cryptd_ahash_child);
 947
 948 struct shash_desc *cryptd_shash_desc(struct ahash_request *req)
 949 {
 950         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 951         return &rctx->desc;
 952 }
 953 EXPORT_SYMBOL_GPL(cryptd_shash_desc);
 954
 955 void cryptd_free_ahash(struct cryptd_ahash *tfm)
 956 {
 957         crypto_free_ahash(&tfm->base);
 958 }
 959 EXPORT_SYMBOL_GPL(cryptd_free_ahash);
 960
 961 struct cryptd_aead *cryptd_alloc_aead(const char *alg_name,
 962                                                   u32 type, u32 mask)
 963 {
 964         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 965         struct crypto_aead *tfm;
 966
 967         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 968                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 969                 return ERR_PTR(-EINVAL);
 970         tfm = crypto_alloc_aead(cryptd_alg_name, type, mask);
 971         if (IS_ERR(tfm))
 972                 return ERR_CAST(tfm);
 973         if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
 974                 crypto_free_aead(tfm);
 975                 return ERR_PTR(-EINVAL);
 976         }
 977         return __cryptd_aead_cast(tfm);
 978 }
 979 EXPORT_SYMBOL_GPL(cryptd_alloc_aead);
 980
 981 struct crypto_aead *cryptd_aead_child(struct cryptd_aead *tfm)
 982 {
 983         struct cryptd_aead_ctx *ctx;
 984         ctx = crypto_aead_ctx(&tfm->base);
 985         return ctx->child;
 986 }
 987 EXPORT_SYMBOL_GPL(cryptd_aead_child);
 988
 989 void cryptd_free_aead(struct cryptd_aead *tfm)
 990 {
 991         crypto_free_aead(&tfm->base);
 992 }
 993 EXPORT_SYMBOL_GPL(cryptd_free_aead);
 994
 995 static int __init cryptd_init(void)
 996 {
 997         int err;
 998
 999         err = cryptd_init_queue(&queue, CRYPTD_MAX_CPU_QLEN);
1000         if (err)
1001                 return err;
1002
1003         err = crypto_register_template(&cryptd_tmpl);
1004         if (err)
1005                 cryptd_fini_queue(&queue);
1006
1007         return err;
1008 }
1009
1010 static void __exit cryptd_exit(void)
1011 {
1012         cryptd_fini_queue(&queue);
1013         crypto_unregister_template(&cryptd_tmpl);
1014 }
1015
1016 subsys_initcall(cryptd_init);
1017 module_exit(cryptd_exit);
1018
1019 MODULE_LICENSE("GPL");
1020 MODULE_DESCRIPTION("Software async crypto daemon");
1021 MODULE_ALIAS_CRYPTO("cryptd");