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