crypto/cryptd.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Software async crypto daemon.
   4  *
   5  * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
   6  *
   7  * Added AEAD support to cryptd.
   8  *    Authors: Tadeusz Struk (tadeusz.struk@intel.com)
   9  *             Adrian Hoban <adrian.hoban@intel.com>
  10  *             Gabriele Paoloni <gabriele.paoloni@intel.com>
  11  *             Aidan O'Mahony (aidan.o.mahony@intel.com)
  12  *    Copyright (c) 2010, Intel Corporation.
  13  */
  14
  15 #include <crypto/internal/hash.h>
  16 #include <crypto/internal/aead.h>
  17 #include <crypto/internal/skcipher.h>
  18 #include <crypto/cryptd.h>
  19 #include <linux/refcount.h>
  20 #include <linux/err.h>
  21 #include <linux/init.h>
  22 #include <linux/kernel.h>
  23 #include <linux/list.h>
  24 #include <linux/module.h>
  25 #include <linux/scatterlist.h>
  26 #include <linux/sched.h>
  27 #include <linux/slab.h>
  28 #include <linux/workqueue.h>
  29
  30 static unsigned int cryptd_max_cpu_qlen = 1000;
  31 module_param(cryptd_max_cpu_qlen, uint, 0);
  32 MODULE_PARM_DESC(cryptd_max_cpu_qlen, "Set cryptd Max queue depth");
  33
  34 static struct workqueue_struct *cryptd_wq;
  35
  36 struct cryptd_cpu_queue {
  37         struct crypto_queue queue;
  38         struct work_struct work;
  39 };
  40
  41 struct cryptd_queue {
  42         /*
  43          * Protected by disabling BH to allow enqueueing from softinterrupt and
  44          * dequeuing from kworker (cryptd_queue_worker()).
  45          */
  46         struct cryptd_cpu_queue __percpu *cpu_queue;
  47 };
  48
  49 struct cryptd_instance_ctx {
  50         struct crypto_spawn spawn;
  51         struct cryptd_queue *queue;
  52 };
  53
  54 struct skcipherd_instance_ctx {
  55         struct crypto_skcipher_spawn spawn;
  56         struct cryptd_queue *queue;
  57 };
  58
  59 struct hashd_instance_ctx {
  60         struct crypto_shash_spawn spawn;
  61         struct cryptd_queue *queue;
  62 };
  63
  64 struct aead_instance_ctx {
  65         struct crypto_aead_spawn aead_spawn;
  66         struct cryptd_queue *queue;
  67 };
  68
  69 struct cryptd_skcipher_ctx {
  70         refcount_t refcnt;
  71         struct crypto_skcipher *child;
  72 };
  73
  74 struct cryptd_skcipher_request_ctx {
  75         struct skcipher_request req;
  76 };
  77
  78 struct cryptd_hash_ctx {
  79         refcount_t refcnt;
  80         struct crypto_shash *child;
  81 };
  82
  83 struct cryptd_hash_request_ctx {
  84         crypto_completion_t complete;
  85         void *data;
  86         struct shash_desc desc;
  87 };
  88
  89 struct cryptd_aead_ctx {
  90         refcount_t refcnt;
  91         struct crypto_aead *child;
  92 };
  93
  94 struct cryptd_aead_request_ctx {
  95         struct aead_request req;
  96 };
  97
  98 static void cryptd_queue_worker(struct work_struct *work);
  99
 100 static int cryptd_init_queue(struct cryptd_queue *queue,
 101                              unsigned int max_cpu_qlen)
 102 {
 103         int cpu;
 104         struct cryptd_cpu_queue *cpu_queue;
 105
 106         queue->cpu_queue = alloc_percpu(struct cryptd_cpu_queue);
 107         if (!queue->cpu_queue)
 108                 return -ENOMEM;
 109         for_each_possible_cpu(cpu) {
 110                 cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
 111                 crypto_init_queue(&cpu_queue->queue, max_cpu_qlen);
 112                 INIT_WORK(&cpu_queue->work, cryptd_queue_worker);
 113         }
 114         pr_info("cryptd: max_cpu_qlen set to %d\n", max_cpu_qlen);
 115         return 0;
 116 }
 117
 118 static void cryptd_fini_queue(struct cryptd_queue *queue)
 119 {
 120         int cpu;
 121         struct cryptd_cpu_queue *cpu_queue;
 122
 123         for_each_possible_cpu(cpu) {
 124                 cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
 125                 BUG_ON(cpu_queue->queue.qlen);
 126         }
 127         free_percpu(queue->cpu_queue);
 128 }
 129
 130 static int cryptd_enqueue_request(struct cryptd_queue *queue,
 131                                   struct crypto_async_request *request)
 132 {
 133         int err;
 134         struct cryptd_cpu_queue *cpu_queue;
 135         refcount_t *refcnt;
 136
 137         local_bh_disable();
 138         cpu_queue = this_cpu_ptr(queue->cpu_queue);
 139         err = crypto_enqueue_request(&cpu_queue->queue, request);
 140
 141         refcnt = crypto_tfm_ctx(request->tfm);
 142
 143         if (err == -ENOSPC)
 144                 goto out;
 145
 146         queue_work_on(smp_processor_id(), cryptd_wq, &cpu_queue->work);
 147
 148         if (!refcount_read(refcnt))
 149                 goto out;
 150
 151         refcount_inc(refcnt);
 152
 153 out:
 154         local_bh_enable();
 155
 156         return err;
 157 }
 158
 159 /* Called in workqueue context, do one real cryption work (via
 160  * req->complete) and reschedule itself if there are more work to
 161  * do. */
 162 static void cryptd_queue_worker(struct work_struct *work)
 163 {
 164         struct cryptd_cpu_queue *cpu_queue;
 165         struct crypto_async_request *req, *backlog;
 166
 167         cpu_queue = container_of(work, struct cryptd_cpu_queue, work);
 168         /*
 169          * Only handle one request at a time to avoid hogging crypto workqueue.
 170          */
 171         local_bh_disable();
 172         backlog = crypto_get_backlog(&cpu_queue->queue);
 173         req = crypto_dequeue_request(&cpu_queue->queue);
 174         local_bh_enable();
 175
 176         if (!req)
 177                 return;
 178
 179         if (backlog)
 180                 crypto_request_complete(backlog, -EINPROGRESS);
 181         crypto_request_complete(req, 0);
 182
 183         if (cpu_queue->queue.qlen)
 184                 queue_work(cryptd_wq, &cpu_queue->work);
 185 }
 186
 187 static inline struct cryptd_queue *cryptd_get_queue(struct crypto_tfm *tfm)
 188 {
 189         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 190         struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
 191         return ictx->queue;
 192 }
 193
 194 static void cryptd_type_and_mask(struct crypto_attr_type *algt,
 195                                  u32 *type, u32 *mask)
 196 {
 197         /*
 198          * cryptd is allowed to wrap internal algorithms, but in that case the
 199          * resulting cryptd instance will be marked as internal as well.
 200          */
 201         *type = algt->type & CRYPTO_ALG_INTERNAL;
 202         *mask = algt->mask & CRYPTO_ALG_INTERNAL;
 203
 204         /* No point in cryptd wrapping an algorithm that's already async. */
 205         *mask |= CRYPTO_ALG_ASYNC;
 206
 207         *mask |= crypto_algt_inherited_mask(algt);
 208 }
 209
 210 static int cryptd_init_instance(struct crypto_instance *inst,
 211                                 struct crypto_alg *alg)
 212 {
 213         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 214                      "cryptd(%s)",
 215                      alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 216                 return -ENAMETOOLONG;
 217
 218         memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
 219
 220         inst->alg.cra_priority = alg->cra_priority + 50;
 221         inst->alg.cra_blocksize = alg->cra_blocksize;
 222         inst->alg.cra_alignmask = alg->cra_alignmask;
 223
 224         return 0;
 225 }
 226
 227 static int cryptd_skcipher_setkey(struct crypto_skcipher *parent,
 228                                   const u8 *key, unsigned int keylen)
 229 {
 230         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(parent);
 231         struct crypto_skcipher *child = ctx->child;
 232
 233         crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 234         crypto_skcipher_set_flags(child,
 235                                   crypto_skcipher_get_flags(parent) &
 236                                   CRYPTO_TFM_REQ_MASK);
 237         return crypto_skcipher_setkey(child, key, keylen);
 238 }
 239
 240 static struct skcipher_request *cryptd_skcipher_prepare(
 241         struct skcipher_request *req, int err)
 242 {
 243         struct cryptd_skcipher_request_ctx *rctx = skcipher_request_ctx(req);
 244         struct skcipher_request *subreq = &rctx->req;
 245         struct cryptd_skcipher_ctx *ctx;
 246         struct crypto_skcipher *child;
 247
 248         req->base.complete = subreq->base.complete;
 249         req->base.data = subreq->base.data;
 250
 251         if (unlikely(err == -EINPROGRESS))
 252                 return NULL;
 253
 254         ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
 255         child = ctx->child;
 256
 257         skcipher_request_set_tfm(subreq, child);
 258         skcipher_request_set_callback(subreq, CRYPTO_TFM_REQ_MAY_SLEEP,
 259                                       NULL, NULL);
 260         skcipher_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
 261                                    req->iv);
 262
 263         return subreq;
 264 }
 265
 266 static void cryptd_skcipher_complete(struct skcipher_request *req, int err,
 267                                      crypto_completion_t complete)
 268 {
 269         struct cryptd_skcipher_request_ctx *rctx = skcipher_request_ctx(req);
 270         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 271         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
 272         struct skcipher_request *subreq = &rctx->req;
 273         int refcnt = refcount_read(&ctx->refcnt);
 274
 275         local_bh_disable();
 276         skcipher_request_complete(req, err);
 277         local_bh_enable();
 278
 279         if (unlikely(err == -EINPROGRESS)) {
 280                 subreq->base.complete = req->base.complete;
 281                 subreq->base.data = req->base.data;
 282                 req->base.complete = complete;
 283                 req->base.data = req;
 284         } else if (refcnt && refcount_dec_and_test(&ctx->refcnt))
 285                 crypto_free_skcipher(tfm);
 286 }
 287
 288 static void cryptd_skcipher_encrypt(void *data, int err)
 289 {
 290         struct skcipher_request *req = data;
 291         struct skcipher_request *subreq;
 292
 293         subreq = cryptd_skcipher_prepare(req, err);
 294         if (likely(subreq))
 295                 err = crypto_skcipher_encrypt(subreq);
 296
 297         cryptd_skcipher_complete(req, err, cryptd_skcipher_encrypt);
 298 }
 299
 300 static void cryptd_skcipher_decrypt(void *data, int err)
 301 {
 302         struct skcipher_request *req = data;
 303         struct skcipher_request *subreq;
 304
 305         subreq = cryptd_skcipher_prepare(req, err);
 306         if (likely(subreq))
 307                 err = crypto_skcipher_decrypt(subreq);
 308
 309         cryptd_skcipher_complete(req, err, cryptd_skcipher_decrypt);
 310 }
 311
 312 static int cryptd_skcipher_enqueue(struct skcipher_request *req,
 313                                    crypto_completion_t compl)
 314 {
 315         struct cryptd_skcipher_request_ctx *rctx = skcipher_request_ctx(req);
 316         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 317         struct skcipher_request *subreq = &rctx->req;
 318         struct cryptd_queue *queue;
 319
 320         queue = cryptd_get_queue(crypto_skcipher_tfm(tfm));
 321         subreq->base.complete = req->base.complete;
 322         subreq->base.data = req->base.data;
 323         req->base.complete = compl;
 324         req->base.data = req;
 325
 326         return cryptd_enqueue_request(queue, &req->base);
 327 }
 328
 329 static int cryptd_skcipher_encrypt_enqueue(struct skcipher_request *req)
 330 {
 331         return cryptd_skcipher_enqueue(req, cryptd_skcipher_encrypt);
 332 }
 333
 334 static int cryptd_skcipher_decrypt_enqueue(struct skcipher_request *req)
 335 {
 336         return cryptd_skcipher_enqueue(req, cryptd_skcipher_decrypt);
 337 }
 338
 339 static int cryptd_skcipher_init_tfm(struct crypto_skcipher *tfm)
 340 {
 341         struct skcipher_instance *inst = skcipher_alg_instance(tfm);
 342         struct skcipherd_instance_ctx *ictx = skcipher_instance_ctx(inst);
 343         struct crypto_skcipher_spawn *spawn = &ictx->spawn;
 344         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
 345         struct crypto_skcipher *cipher;
 346
 347         cipher = crypto_spawn_skcipher(spawn);
 348         if (IS_ERR(cipher))
 349                 return PTR_ERR(cipher);
 350
 351         ctx->child = cipher;
 352         crypto_skcipher_set_reqsize(
 353                 tfm, sizeof(struct cryptd_skcipher_request_ctx) +
 354                      crypto_skcipher_reqsize(cipher));
 355         return 0;
 356 }
 357
 358 static void cryptd_skcipher_exit_tfm(struct crypto_skcipher *tfm)
 359 {
 360         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
 361
 362         crypto_free_skcipher(ctx->child);
 363 }
 364
 365 static void cryptd_skcipher_free(struct skcipher_instance *inst)
 366 {
 367         struct skcipherd_instance_ctx *ctx = skcipher_instance_ctx(inst);
 368
 369         crypto_drop_skcipher(&ctx->spawn);
 370         kfree(inst);
 371 }
 372
 373 static int cryptd_create_skcipher(struct crypto_template *tmpl,
 374                                   struct rtattr **tb,
 375                                   struct crypto_attr_type *algt,
 376                                   struct cryptd_queue *queue)
 377 {
 378         struct skcipherd_instance_ctx *ctx;
 379         struct skcipher_instance *inst;
 380         struct skcipher_alg_common *alg;
 381         u32 type;
 382         u32 mask;
 383         int err;
 384
 385         cryptd_type_and_mask(algt, &type, &mask);
 386
 387         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 388         if (!inst)
 389                 return -ENOMEM;
 390
 391         ctx = skcipher_instance_ctx(inst);
 392         ctx->queue = queue;
 393
 394         err = crypto_grab_skcipher(&ctx->spawn, skcipher_crypto_instance(inst),
 395                                    crypto_attr_alg_name(tb[1]), type, mask);
 396         if (err)
 397                 goto err_free_inst;
 398
 399         alg = crypto_spawn_skcipher_alg_common(&ctx->spawn);
 400         err = cryptd_init_instance(skcipher_crypto_instance(inst), &alg->base);
 401         if (err)
 402                 goto err_free_inst;
 403
 404         inst->alg.base.cra_flags |= CRYPTO_ALG_ASYNC |
 405                 (alg->base.cra_flags & CRYPTO_ALG_INTERNAL);
 406         inst->alg.ivsize = alg->ivsize;
 407         inst->alg.chunksize = alg->chunksize;
 408         inst->alg.min_keysize = alg->min_keysize;
 409         inst->alg.max_keysize = alg->max_keysize;
 410
 411         inst->alg.base.cra_ctxsize = sizeof(struct cryptd_skcipher_ctx);
 412
 413         inst->alg.init = cryptd_skcipher_init_tfm;
 414         inst->alg.exit = cryptd_skcipher_exit_tfm;
 415
 416         inst->alg.setkey = cryptd_skcipher_setkey;
 417         inst->alg.encrypt = cryptd_skcipher_encrypt_enqueue;
 418         inst->alg.decrypt = cryptd_skcipher_decrypt_enqueue;
 419
 420         inst->free = cryptd_skcipher_free;
 421
 422         err = skcipher_register_instance(tmpl, inst);
 423         if (err) {
 424 err_free_inst:
 425                 cryptd_skcipher_free(inst);
 426         }
 427         return err;
 428 }
 429
 430 static int cryptd_hash_init_tfm(struct crypto_ahash *tfm)
 431 {
 432         struct ahash_instance *inst = ahash_alg_instance(tfm);
 433         struct hashd_instance_ctx *ictx = ahash_instance_ctx(inst);
 434         struct crypto_shash_spawn *spawn = &ictx->spawn;
 435         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 436         struct crypto_shash *hash;
 437
 438         hash = crypto_spawn_shash(spawn);
 439         if (IS_ERR(hash))
 440                 return PTR_ERR(hash);
 441
 442         ctx->child = hash;
 443         crypto_ahash_set_reqsize(tfm,
 444                                  sizeof(struct cryptd_hash_request_ctx) +
 445                                  crypto_shash_descsize(hash));
 446         return 0;
 447 }
 448
 449 static int cryptd_hash_clone_tfm(struct crypto_ahash *ntfm,
 450                                  struct crypto_ahash *tfm)
 451 {
 452         struct cryptd_hash_ctx *nctx = crypto_ahash_ctx(ntfm);
 453         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 454         struct crypto_shash *hash;
 455
 456         hash = crypto_clone_shash(ctx->child);
 457         if (IS_ERR(hash))
 458                 return PTR_ERR(hash);
 459
 460         nctx->child = hash;
 461         return 0;
 462 }
 463
 464 static void cryptd_hash_exit_tfm(struct crypto_ahash *tfm)
 465 {
 466         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 467
 468         crypto_free_shash(ctx->child);
 469 }
 470
 471 static int cryptd_hash_setkey(struct crypto_ahash *parent,
 472                                    const u8 *key, unsigned int keylen)
 473 {
 474         struct cryptd_hash_ctx *ctx   = crypto_ahash_ctx(parent);
 475         struct crypto_shash *child = ctx->child;
 476
 477         crypto_shash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 478         crypto_shash_set_flags(child, crypto_ahash_get_flags(parent) &
 479                                       CRYPTO_TFM_REQ_MASK);
 480         return crypto_shash_setkey(child, key, keylen);
 481 }
 482
 483 static int cryptd_hash_enqueue(struct ahash_request *req,
 484                                 crypto_completion_t compl)
 485 {
 486         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 487         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 488         struct cryptd_queue *queue =
 489                 cryptd_get_queue(crypto_ahash_tfm(tfm));
 490
 491         rctx->complete = req->base.complete;
 492         rctx->data = req->base.data;
 493         req->base.complete = compl;
 494         req->base.data = req;
 495
 496         return cryptd_enqueue_request(queue, &req->base);
 497 }
 498
 499 static struct shash_desc *cryptd_hash_prepare(struct ahash_request *req,
 500                                               int err)
 501 {
 502         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 503
 504         req->base.complete = rctx->complete;
 505         req->base.data = rctx->data;
 506
 507         if (unlikely(err == -EINPROGRESS))
 508                 return NULL;
 509
 510         return &rctx->desc;
 511 }
 512
 513 static void cryptd_hash_complete(struct ahash_request *req, int err,
 514                                  crypto_completion_t complete)
 515 {
 516         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 517         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 518         int refcnt = refcount_read(&ctx->refcnt);
 519
 520         local_bh_disable();
 521         ahash_request_complete(req, err);
 522         local_bh_enable();
 523
 524         if (err == -EINPROGRESS) {
 525                 req->base.complete = complete;
 526                 req->base.data = req;
 527         } else if (refcnt && refcount_dec_and_test(&ctx->refcnt))
 528                 crypto_free_ahash(tfm);
 529 }
 530
 531 static void cryptd_hash_init(void *data, int err)
 532 {
 533         struct ahash_request *req = data;
 534         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 535         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 536         struct crypto_shash *child = ctx->child;
 537         struct shash_desc *desc;
 538
 539         desc = cryptd_hash_prepare(req, err);
 540         if (unlikely(!desc))
 541                 goto out;
 542
 543         desc->tfm = child;
 544
 545         err = crypto_shash_init(desc);
 546
 547 out:
 548         cryptd_hash_complete(req, err, cryptd_hash_init);
 549 }
 550
 551 static int cryptd_hash_init_enqueue(struct ahash_request *req)
 552 {
 553         return cryptd_hash_enqueue(req, cryptd_hash_init);
 554 }
 555
 556 static void cryptd_hash_update(void *data, int err)
 557 {
 558         struct ahash_request *req = data;
 559         struct shash_desc *desc;
 560
 561         desc = cryptd_hash_prepare(req, err);
 562         if (likely(desc))
 563                 err = shash_ahash_update(req, desc);
 564
 565         cryptd_hash_complete(req, err, cryptd_hash_update);
 566 }
 567
 568 static int cryptd_hash_update_enqueue(struct ahash_request *req)
 569 {
 570         return cryptd_hash_enqueue(req, cryptd_hash_update);
 571 }
 572
 573 static void cryptd_hash_final(void *data, int err)
 574 {
 575         struct ahash_request *req = data;
 576         struct shash_desc *desc;
 577
 578         desc = cryptd_hash_prepare(req, err);
 579         if (likely(desc))
 580                 err = crypto_shash_final(desc, req->result);
 581
 582         cryptd_hash_complete(req, err, cryptd_hash_final);
 583 }
 584
 585 static int cryptd_hash_final_enqueue(struct ahash_request *req)
 586 {
 587         return cryptd_hash_enqueue(req, cryptd_hash_final);
 588 }
 589
 590 static void cryptd_hash_finup(void *data, int err)
 591 {
 592         struct ahash_request *req = data;
 593         struct shash_desc *desc;
 594
 595         desc = cryptd_hash_prepare(req, err);
 596         if (likely(desc))
 597                 err = shash_ahash_finup(req, desc);
 598
 599         cryptd_hash_complete(req, err, cryptd_hash_finup);
 600 }
 601
 602 static int cryptd_hash_finup_enqueue(struct ahash_request *req)
 603 {
 604         return cryptd_hash_enqueue(req, cryptd_hash_finup);
 605 }
 606
 607 static void cryptd_hash_digest(void *data, int err)
 608 {
 609         struct ahash_request *req = data;
 610         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 611         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 612         struct crypto_shash *child = ctx->child;
 613         struct shash_desc *desc;
 614
 615         desc = cryptd_hash_prepare(req, err);
 616         if (unlikely(!desc))
 617                 goto out;
 618
 619         desc->tfm = child;
 620
 621         err = shash_ahash_digest(req, desc);
 622
 623 out:
 624         cryptd_hash_complete(req, err, cryptd_hash_digest);
 625 }
 626
 627 static int cryptd_hash_digest_enqueue(struct ahash_request *req)
 628 {
 629         return cryptd_hash_enqueue(req, cryptd_hash_digest);
 630 }
 631
 632 static int cryptd_hash_export(struct ahash_request *req, void *out)
 633 {
 634         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 635
 636         return crypto_shash_export(&rctx->desc, out);
 637 }
 638
 639 static int cryptd_hash_import(struct ahash_request *req, const void *in)
 640 {
 641         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 642         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm);
 643         struct shash_desc *desc = cryptd_shash_desc(req);
 644
 645         desc->tfm = ctx->child;
 646
 647         return crypto_shash_import(desc, in);
 648 }
 649
 650 static void cryptd_hash_free(struct ahash_instance *inst)
 651 {
 652         struct hashd_instance_ctx *ctx = ahash_instance_ctx(inst);
 653
 654         crypto_drop_shash(&ctx->spawn);
 655         kfree(inst);
 656 }
 657
 658 static int cryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,
 659                               struct crypto_attr_type *algt,
 660                               struct cryptd_queue *queue)
 661 {
 662         struct hashd_instance_ctx *ctx;
 663         struct ahash_instance *inst;
 664         struct shash_alg *alg;
 665         u32 type;
 666         u32 mask;
 667         int err;
 668
 669         cryptd_type_and_mask(algt, &type, &mask);
 670
 671         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 672         if (!inst)
 673                 return -ENOMEM;
 674
 675         ctx = ahash_instance_ctx(inst);
 676         ctx->queue = queue;
 677
 678         err = crypto_grab_shash(&ctx->spawn, ahash_crypto_instance(inst),
 679                                 crypto_attr_alg_name(tb[1]), type, mask);
 680         if (err)
 681                 goto err_free_inst;
 682         alg = crypto_spawn_shash_alg(&ctx->spawn);
 683
 684         err = cryptd_init_instance(ahash_crypto_instance(inst), &alg->base);
 685         if (err)
 686                 goto err_free_inst;
 687
 688         inst->alg.halg.base.cra_flags |= CRYPTO_ALG_ASYNC |
 689                 (alg->base.cra_flags & (CRYPTO_ALG_INTERNAL|
 690                                         CRYPTO_ALG_OPTIONAL_KEY));
 691         inst->alg.halg.digestsize = alg->digestsize;
 692         inst->alg.halg.statesize = alg->statesize;
 693         inst->alg.halg.base.cra_ctxsize = sizeof(struct cryptd_hash_ctx);
 694
 695         inst->alg.init_tfm = cryptd_hash_init_tfm;
 696         inst->alg.clone_tfm = cryptd_hash_clone_tfm;
 697         inst->alg.exit_tfm = cryptd_hash_exit_tfm;
 698
 699         inst->alg.init   = cryptd_hash_init_enqueue;
 700         inst->alg.update = cryptd_hash_update_enqueue;
 701         inst->alg.final  = cryptd_hash_final_enqueue;
 702         inst->alg.finup  = cryptd_hash_finup_enqueue;
 703         inst->alg.export = cryptd_hash_export;
 704         inst->alg.import = cryptd_hash_import;
 705         if (crypto_shash_alg_has_setkey(alg))
 706                 inst->alg.setkey = cryptd_hash_setkey;
 707         inst->alg.digest = cryptd_hash_digest_enqueue;
 708
 709         inst->free = cryptd_hash_free;
 710
 711         err = ahash_register_instance(tmpl, inst);
 712         if (err) {
 713 err_free_inst:
 714                 cryptd_hash_free(inst);
 715         }
 716         return err;
 717 }
 718
 719 static int cryptd_aead_setkey(struct crypto_aead *parent,
 720                               const u8 *key, unsigned int keylen)
 721 {
 722         struct cryptd_aead_ctx *ctx = crypto_aead_ctx(parent);
 723         struct crypto_aead *child = ctx->child;
 724
 725         return crypto_aead_setkey(child, key, keylen);
 726 }
 727
 728 static int cryptd_aead_setauthsize(struct crypto_aead *parent,
 729                                    unsigned int authsize)
 730 {
 731         struct cryptd_aead_ctx *ctx = crypto_aead_ctx(parent);
 732         struct crypto_aead *child = ctx->child;
 733
 734         return crypto_aead_setauthsize(child, authsize);
 735 }
 736
 737 static void cryptd_aead_crypt(struct aead_request *req,
 738                               struct crypto_aead *child, int err,
 739                               int (*crypt)(struct aead_request *req),
 740                               crypto_completion_t compl)
 741 {
 742         struct cryptd_aead_request_ctx *rctx;
 743         struct aead_request *subreq;
 744         struct cryptd_aead_ctx *ctx;
 745         struct crypto_aead *tfm;
 746         int refcnt;
 747
 748         rctx = aead_request_ctx(req);
 749         subreq = &rctx->req;
 750         req->base.complete = subreq->base.complete;
 751         req->base.data = subreq->base.data;
 752
 753         tfm = crypto_aead_reqtfm(req);
 754
 755         if (unlikely(err == -EINPROGRESS))
 756                 goto out;
 757
 758         aead_request_set_tfm(subreq, child);
 759         aead_request_set_callback(subreq, CRYPTO_TFM_REQ_MAY_SLEEP,
 760                                   NULL, NULL);
 761         aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
 762                                req->iv);
 763         aead_request_set_ad(subreq, req->assoclen);
 764
 765         err = crypt(subreq);
 766
 767 out:
 768         ctx = crypto_aead_ctx(tfm);
 769         refcnt = refcount_read(&ctx->refcnt);
 770
 771         local_bh_disable();
 772         aead_request_complete(req, err);
 773         local_bh_enable();
 774
 775         if (err == -EINPROGRESS) {
 776                 subreq->base.complete = req->base.complete;
 777                 subreq->base.data = req->base.data;
 778                 req->base.complete = compl;
 779                 req->base.data = req;
 780         } else if (refcnt && refcount_dec_and_test(&ctx->refcnt))
 781                 crypto_free_aead(tfm);
 782 }
 783
 784 static void cryptd_aead_encrypt(void *data, int err)
 785 {
 786         struct aead_request *req = data;
 787         struct cryptd_aead_ctx *ctx;
 788         struct crypto_aead *child;
 789
 790         ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
 791         child = ctx->child;
 792         cryptd_aead_crypt(req, child, err, crypto_aead_alg(child)->encrypt,
 793                           cryptd_aead_encrypt);
 794 }
 795
 796 static void cryptd_aead_decrypt(void *data, int err)
 797 {
 798         struct aead_request *req = data;
 799         struct cryptd_aead_ctx *ctx;
 800         struct crypto_aead *child;
 801
 802         ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
 803         child = ctx->child;
 804         cryptd_aead_crypt(req, child, err, crypto_aead_alg(child)->decrypt,
 805                           cryptd_aead_decrypt);
 806 }
 807
 808 static int cryptd_aead_enqueue(struct aead_request *req,
 809                                     crypto_completion_t compl)
 810 {
 811         struct cryptd_aead_request_ctx *rctx = aead_request_ctx(req);
 812         struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 813         struct cryptd_queue *queue = cryptd_get_queue(crypto_aead_tfm(tfm));
 814         struct aead_request *subreq = &rctx->req;
 815
 816         subreq->base.complete = req->base.complete;
 817         subreq->base.data = req->base.data;
 818         req->base.complete = compl;
 819         req->base.data = req;
 820         return cryptd_enqueue_request(queue, &req->base);
 821 }
 822
 823 static int cryptd_aead_encrypt_enqueue(struct aead_request *req)
 824 {
 825         return cryptd_aead_enqueue(req, cryptd_aead_encrypt );
 826 }
 827
 828 static int cryptd_aead_decrypt_enqueue(struct aead_request *req)
 829 {
 830         return cryptd_aead_enqueue(req, cryptd_aead_decrypt );
 831 }
 832
 833 static int cryptd_aead_init_tfm(struct crypto_aead *tfm)
 834 {
 835         struct aead_instance *inst = aead_alg_instance(tfm);
 836         struct aead_instance_ctx *ictx = aead_instance_ctx(inst);
 837         struct crypto_aead_spawn *spawn = &ictx->aead_spawn;
 838         struct cryptd_aead_ctx *ctx = crypto_aead_ctx(tfm);
 839         struct crypto_aead *cipher;
 840
 841         cipher = crypto_spawn_aead(spawn);
 842         if (IS_ERR(cipher))
 843                 return PTR_ERR(cipher);
 844
 845         ctx->child = cipher;
 846         crypto_aead_set_reqsize(
 847                 tfm, sizeof(struct cryptd_aead_request_ctx) +
 848                      crypto_aead_reqsize(cipher));
 849         return 0;
 850 }
 851
 852 static void cryptd_aead_exit_tfm(struct crypto_aead *tfm)
 853 {
 854         struct cryptd_aead_ctx *ctx = crypto_aead_ctx(tfm);
 855         crypto_free_aead(ctx->child);
 856 }
 857
 858 static void cryptd_aead_free(struct aead_instance *inst)
 859 {
 860         struct aead_instance_ctx *ctx = aead_instance_ctx(inst);
 861
 862         crypto_drop_aead(&ctx->aead_spawn);
 863         kfree(inst);
 864 }
 865
 866 static int cryptd_create_aead(struct crypto_template *tmpl,
 867                               struct rtattr **tb,
 868                               struct crypto_attr_type *algt,
 869                               struct cryptd_queue *queue)
 870 {
 871         struct aead_instance_ctx *ctx;
 872         struct aead_instance *inst;
 873         struct aead_alg *alg;
 874         u32 type;
 875         u32 mask;
 876         int err;
 877
 878         cryptd_type_and_mask(algt, &type, &mask);
 879
 880         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 881         if (!inst)
 882                 return -ENOMEM;
 883
 884         ctx = aead_instance_ctx(inst);
 885         ctx->queue = queue;
 886
 887         err = crypto_grab_aead(&ctx->aead_spawn, aead_crypto_instance(inst),
 888                                crypto_attr_alg_name(tb[1]), type, mask);
 889         if (err)
 890                 goto err_free_inst;
 891
 892         alg = crypto_spawn_aead_alg(&ctx->aead_spawn);
 893         err = cryptd_init_instance(aead_crypto_instance(inst), &alg->base);
 894         if (err)
 895                 goto err_free_inst;
 896
 897         inst->alg.base.cra_flags |= CRYPTO_ALG_ASYNC |
 898                 (alg->base.cra_flags & CRYPTO_ALG_INTERNAL);
 899         inst->alg.base.cra_ctxsize = sizeof(struct cryptd_aead_ctx);
 900
 901         inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
 902         inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
 903
 904         inst->alg.init = cryptd_aead_init_tfm;
 905         inst->alg.exit = cryptd_aead_exit_tfm;
 906         inst->alg.setkey = cryptd_aead_setkey;
 907         inst->alg.setauthsize = cryptd_aead_setauthsize;
 908         inst->alg.encrypt = cryptd_aead_encrypt_enqueue;
 909         inst->alg.decrypt = cryptd_aead_decrypt_enqueue;
 910
 911         inst->free = cryptd_aead_free;
 912
 913         err = aead_register_instance(tmpl, inst);
 914         if (err) {
 915 err_free_inst:
 916                 cryptd_aead_free(inst);
 917         }
 918         return err;
 919 }
 920
 921 static struct cryptd_queue queue;
 922
 923 static int cryptd_create(struct crypto_template *tmpl, struct rtattr **tb)
 924 {
 925         struct crypto_attr_type *algt;
 926
 927         algt = crypto_get_attr_type(tb);
 928         if (IS_ERR(algt))
 929                 return PTR_ERR(algt);
 930
 931         switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
 932         case CRYPTO_ALG_TYPE_LSKCIPHER:
 933                 return cryptd_create_skcipher(tmpl, tb, algt, &queue);
 934         case CRYPTO_ALG_TYPE_HASH:
 935                 return cryptd_create_hash(tmpl, tb, algt, &queue);
 936         case CRYPTO_ALG_TYPE_AEAD:
 937                 return cryptd_create_aead(tmpl, tb, algt, &queue);
 938         }
 939
 940         return -EINVAL;
 941 }
 942
 943 static struct crypto_template cryptd_tmpl = {
 944         .name = "cryptd",
 945         .create = cryptd_create,
 946         .module = THIS_MODULE,
 947 };
 948
 949 struct cryptd_skcipher *cryptd_alloc_skcipher(const char *alg_name,
 950                                               u32 type, u32 mask)
 951 {
 952         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 953         struct cryptd_skcipher_ctx *ctx;
 954         struct crypto_skcipher *tfm;
 955
 956         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 957                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 958                 return ERR_PTR(-EINVAL);
 959
 960         tfm = crypto_alloc_skcipher(cryptd_alg_name, type, mask);
 961         if (IS_ERR(tfm))
 962                 return ERR_CAST(tfm);
 963
 964         if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
 965                 crypto_free_skcipher(tfm);
 966                 return ERR_PTR(-EINVAL);
 967         }
 968
 969         ctx = crypto_skcipher_ctx(tfm);
 970         refcount_set(&ctx->refcnt, 1);
 971
 972         return container_of(tfm, struct cryptd_skcipher, base);
 973 }
 974 EXPORT_SYMBOL_GPL(cryptd_alloc_skcipher);
 975
 976 struct crypto_skcipher *cryptd_skcipher_child(struct cryptd_skcipher *tfm)
 977 {
 978         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(&tfm->base);
 979
 980         return ctx->child;
 981 }
 982 EXPORT_SYMBOL_GPL(cryptd_skcipher_child);
 983
 984 bool cryptd_skcipher_queued(struct cryptd_skcipher *tfm)
 985 {
 986         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(&tfm->base);
 987
 988         return refcount_read(&ctx->refcnt) - 1;
 989 }
 990 EXPORT_SYMBOL_GPL(cryptd_skcipher_queued);
 991
 992 void cryptd_free_skcipher(struct cryptd_skcipher *tfm)
 993 {
 994         struct cryptd_skcipher_ctx *ctx = crypto_skcipher_ctx(&tfm->base);
 995
 996         if (refcount_dec_and_test(&ctx->refcnt))
 997                 crypto_free_skcipher(&tfm->base);
 998 }
 999 EXPORT_SYMBOL_GPL(cryptd_free_skcipher);
1000
1001 struct cryptd_ahash *cryptd_alloc_ahash(const char *alg_name,
1002                                         u32 type, u32 mask)
1003 {
1004         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
1005         struct cryptd_hash_ctx *ctx;
1006         struct crypto_ahash *tfm;
1007
1008         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
1009                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
1010                 return ERR_PTR(-EINVAL);
1011         tfm = crypto_alloc_ahash(cryptd_alg_name, type, mask);
1012         if (IS_ERR(tfm))
1013                 return ERR_CAST(tfm);
1014         if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
1015                 crypto_free_ahash(tfm);
1016                 return ERR_PTR(-EINVAL);
1017         }
1018
1019         ctx = crypto_ahash_ctx(tfm);
1020         refcount_set(&ctx->refcnt, 1);
1021
1022         return __cryptd_ahash_cast(tfm);
1023 }
1024 EXPORT_SYMBOL_GPL(cryptd_alloc_ahash);
1025
1026 struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm)
1027 {
1028         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
1029
1030         return ctx->child;
1031 }
1032 EXPORT_SYMBOL_GPL(cryptd_ahash_child);
1033
1034 struct shash_desc *cryptd_shash_desc(struct ahash_request *req)
1035 {
1036         struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
1037         return &rctx->desc;
1038 }
1039 EXPORT_SYMBOL_GPL(cryptd_shash_desc);
1040
1041 bool cryptd_ahash_queued(struct cryptd_ahash *tfm)
1042 {
1043         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
1044
1045         return refcount_read(&ctx->refcnt) - 1;
1046 }
1047 EXPORT_SYMBOL_GPL(cryptd_ahash_queued);
1048
1049 void cryptd_free_ahash(struct cryptd_ahash *tfm)
1050 {
1051         struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
1052
1053         if (refcount_dec_and_test(&ctx->refcnt))
1054                 crypto_free_ahash(&tfm->base);
1055 }
1056 EXPORT_SYMBOL_GPL(cryptd_free_ahash);
1057
1058 struct cryptd_aead *cryptd_alloc_aead(const char *alg_name,
1059                                                   u32 type, u32 mask)
1060 {
1061         char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
1062         struct cryptd_aead_ctx *ctx;
1063         struct crypto_aead *tfm;
1064
1065         if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
1066                      "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
1067                 return ERR_PTR(-EINVAL);
1068         tfm = crypto_alloc_aead(cryptd_alg_name, type, mask);
1069         if (IS_ERR(tfm))
1070                 return ERR_CAST(tfm);
1071         if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
1072                 crypto_free_aead(tfm);
1073                 return ERR_PTR(-EINVAL);
1074         }
1075
1076         ctx = crypto_aead_ctx(tfm);
1077         refcount_set(&ctx->refcnt, 1);
1078
1079         return __cryptd_aead_cast(tfm);
1080 }
1081 EXPORT_SYMBOL_GPL(cryptd_alloc_aead);
1082
1083 struct crypto_aead *cryptd_aead_child(struct cryptd_aead *tfm)
1084 {
1085         struct cryptd_aead_ctx *ctx;
1086         ctx = crypto_aead_ctx(&tfm->base);
1087         return ctx->child;
1088 }
1089 EXPORT_SYMBOL_GPL(cryptd_aead_child);
1090
1091 bool cryptd_aead_queued(struct cryptd_aead *tfm)
1092 {
1093         struct cryptd_aead_ctx *ctx = crypto_aead_ctx(&tfm->base);
1094
1095         return refcount_read(&ctx->refcnt) - 1;
1096 }
1097 EXPORT_SYMBOL_GPL(cryptd_aead_queued);
1098
1099 void cryptd_free_aead(struct cryptd_aead *tfm)
1100 {
1101         struct cryptd_aead_ctx *ctx = crypto_aead_ctx(&tfm->base);
1102
1103         if (refcount_dec_and_test(&ctx->refcnt))
1104                 crypto_free_aead(&tfm->base);
1105 }
1106 EXPORT_SYMBOL_GPL(cryptd_free_aead);
1107
1108 static int __init cryptd_init(void)
1109 {
1110         int err;
1111
1112         cryptd_wq = alloc_workqueue("cryptd", WQ_MEM_RECLAIM | WQ_CPU_INTENSIVE,
1113                                     1);
1114         if (!cryptd_wq)
1115                 return -ENOMEM;
1116
1117         err = cryptd_init_queue(&queue, cryptd_max_cpu_qlen);
1118         if (err)
1119                 goto err_destroy_wq;
1120
1121         err = crypto_register_template(&cryptd_tmpl);
1122         if (err)
1123                 goto err_fini_queue;
1124
1125         return 0;
1126
1127 err_fini_queue:
1128         cryptd_fini_queue(&queue);
1129 err_destroy_wq:
1130         destroy_workqueue(cryptd_wq);
1131         return err;
1132 }
1133
1134 static void __exit cryptd_exit(void)
1135 {
1136         destroy_workqueue(cryptd_wq);
1137         cryptd_fini_queue(&queue);
1138         crypto_unregister_template(&cryptd_tmpl);
1139 }
1140
1141 subsys_initcall(cryptd_init);
1142 module_exit(cryptd_exit);
1143
1144 MODULE_LICENSE("GPL");
1145 MODULE_DESCRIPTION("Software async crypto daemon");
1146 MODULE_ALIAS_CRYPTO("cryptd");