crypto/mcryptd.c

   1 /*
   2  * Software multibuffer async crypto daemon.
   3  *
   4  * Copyright (c) 2014 Tim Chen <tim.c.chen@linux.intel.com>
   5  *
   6  * Adapted from crypto daemon.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the Free
  10  * Software Foundation; either version 2 of the License, or (at your option)
  11  * any later version.
  12  *
  13  */
  14
  15 #include <crypto/algapi.h>
  16 #include <crypto/internal/hash.h>
  17 #include <crypto/internal/aead.h>
  18 #include <crypto/mcryptd.h>
  19 #include <crypto/crypto_wq.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/hardirq.h>
  29
  30 #define MCRYPTD_MAX_CPU_QLEN 100
  31 #define MCRYPTD_BATCH 9
  32
  33 static void *mcryptd_alloc_instance(struct crypto_alg *alg, unsigned int head,
  34                                    unsigned int tail);
  35
  36 struct mcryptd_flush_list {
  37         struct list_head list;
  38         struct mutex lock;
  39 };
  40
  41 static struct mcryptd_flush_list __percpu *mcryptd_flist;
  42
  43 struct hashd_instance_ctx {
  44         struct crypto_shash_spawn spawn;
  45         struct mcryptd_queue *queue;
  46 };
  47
  48 static void mcryptd_queue_worker(struct work_struct *work);
  49
  50 void mcryptd_arm_flusher(struct mcryptd_alg_cstate *cstate, unsigned long delay)
  51 {
  52         struct mcryptd_flush_list *flist;
  53
  54         if (!cstate->flusher_engaged) {
  55                 /* put the flusher on the flush list */
  56                 flist = per_cpu_ptr(mcryptd_flist, smp_processor_id());
  57                 mutex_lock(&flist->lock);
  58                 list_add_tail(&cstate->flush_list, &flist->list);
  59                 cstate->flusher_engaged = true;
  60                 cstate->next_flush = jiffies + delay;
  61                 queue_delayed_work_on(smp_processor_id(), kcrypto_wq,
  62                         &cstate->flush, delay);
  63                 mutex_unlock(&flist->lock);
  64         }
  65 }
  66 EXPORT_SYMBOL(mcryptd_arm_flusher);
  67
  68 static int mcryptd_init_queue(struct mcryptd_queue *queue,
  69                              unsigned int max_cpu_qlen)
  70 {
  71         int cpu;
  72         struct mcryptd_cpu_queue *cpu_queue;
  73
  74         queue->cpu_queue = alloc_percpu(struct mcryptd_cpu_queue);
  75         pr_debug("mqueue:%p mcryptd_cpu_queue %p\n", queue, queue->cpu_queue);
  76         if (!queue->cpu_queue)
  77                 return -ENOMEM;
  78         for_each_possible_cpu(cpu) {
  79                 cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
  80                 pr_debug("cpu_queue #%d %p\n", cpu, queue->cpu_queue);
  81                 crypto_init_queue(&cpu_queue->queue, max_cpu_qlen);
  82                 INIT_WORK(&cpu_queue->work, mcryptd_queue_worker);
  83         }
  84         return 0;
  85 }
  86
  87 static void mcryptd_fini_queue(struct mcryptd_queue *queue)
  88 {
  89         int cpu;
  90         struct mcryptd_cpu_queue *cpu_queue;
  91
  92         for_each_possible_cpu(cpu) {
  93                 cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
  94                 BUG_ON(cpu_queue->queue.qlen);
  95         }
  96         free_percpu(queue->cpu_queue);
  97 }
  98
  99 static int mcryptd_enqueue_request(struct mcryptd_queue *queue,
 100                                   struct crypto_async_request *request,
 101                                   struct mcryptd_hash_request_ctx *rctx)
 102 {
 103         int cpu, err;
 104         struct mcryptd_cpu_queue *cpu_queue;
 105
 106         cpu = get_cpu();
 107         cpu_queue = this_cpu_ptr(queue->cpu_queue);
 108         rctx->tag.cpu = cpu;
 109
 110         err = crypto_enqueue_request(&cpu_queue->queue, request);
 111         pr_debug("enqueue request: cpu %d cpu_queue %p request %p\n",
 112                  cpu, cpu_queue, request);
 113         queue_work_on(cpu, kcrypto_wq, &cpu_queue->work);
 114         put_cpu();
 115
 116         return err;
 117 }
 118
 119 /*
 120  * Try to opportunisticlly flush the partially completed jobs if
 121  * crypto daemon is the only task running.
 122  */
 123 static void mcryptd_opportunistic_flush(void)
 124 {
 125         struct mcryptd_flush_list *flist;
 126         struct mcryptd_alg_cstate *cstate;
 127
 128         flist = per_cpu_ptr(mcryptd_flist, smp_processor_id());
 129         while (single_task_running()) {
 130                 mutex_lock(&flist->lock);
 131                 cstate = list_first_entry_or_null(&flist->list,
 132                                 struct mcryptd_alg_cstate, flush_list);
 133                 if (!cstate || !cstate->flusher_engaged) {
 134                         mutex_unlock(&flist->lock);
 135                         return;
 136                 }
 137                 list_del(&cstate->flush_list);
 138                 cstate->flusher_engaged = false;
 139                 mutex_unlock(&flist->lock);
 140                 cstate->alg_state->flusher(cstate);
 141         }
 142 }
 143
 144 /*
 145  * Called in workqueue context, do one real cryption work (via
 146  * req->complete) and reschedule itself if there are more work to
 147  * do.
 148  */
 149 static void mcryptd_queue_worker(struct work_struct *work)
 150 {
 151         struct mcryptd_cpu_queue *cpu_queue;
 152         struct crypto_async_request *req, *backlog;
 153         int i;
 154
 155         /*
 156          * Need to loop through more than once for multi-buffer to
 157          * be effective.
 158          */
 159
 160         cpu_queue = container_of(work, struct mcryptd_cpu_queue, work);
 161         i = 0;
 162         while (i < MCRYPTD_BATCH || single_task_running()) {
 163                 /*
 164                  * preempt_disable/enable is used to prevent
 165                  * being preempted by mcryptd_enqueue_request()
 166                  */
 167                 local_bh_disable();
 168                 preempt_disable();
 169                 backlog = crypto_get_backlog(&cpu_queue->queue);
 170                 req = crypto_dequeue_request(&cpu_queue->queue);
 171                 preempt_enable();
 172                 local_bh_enable();
 173
 174                 if (!req) {
 175                         mcryptd_opportunistic_flush();
 176                         return;
 177                 }
 178
 179                 if (backlog)
 180                         backlog->complete(backlog, -EINPROGRESS);
 181                 req->complete(req, 0);
 182                 if (!cpu_queue->queue.qlen)
 183                         return;
 184                 ++i;
 185         }
 186         if (cpu_queue->queue.qlen)
 187                 queue_work(kcrypto_wq, &cpu_queue->work);
 188 }
 189
 190 void mcryptd_flusher(struct work_struct *__work)
 191 {
 192         struct  mcryptd_alg_cstate      *alg_cpu_state;
 193         struct  mcryptd_alg_state       *alg_state;
 194         struct  mcryptd_flush_list      *flist;
 195         int     cpu;
 196
 197         cpu = smp_processor_id();
 198         alg_cpu_state = container_of(to_delayed_work(__work),
 199                                      struct mcryptd_alg_cstate, flush);
 200         alg_state = alg_cpu_state->alg_state;
 201         if (alg_cpu_state->cpu != cpu)
 202                 pr_debug("mcryptd error: work on cpu %d, should be cpu %d\n",
 203                                 cpu, alg_cpu_state->cpu);
 204
 205         if (alg_cpu_state->flusher_engaged) {
 206                 flist = per_cpu_ptr(mcryptd_flist, cpu);
 207                 mutex_lock(&flist->lock);
 208                 list_del(&alg_cpu_state->flush_list);
 209                 alg_cpu_state->flusher_engaged = false;
 210                 mutex_unlock(&flist->lock);
 211                 alg_state->flusher(alg_cpu_state);
 212         }
 213 }
 214 EXPORT_SYMBOL_GPL(mcryptd_flusher);
 215
 216 static inline struct mcryptd_queue *mcryptd_get_queue(struct crypto_tfm *tfm)
 217 {
 218         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 219         struct mcryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
 220
 221         return ictx->queue;
 222 }
 223
 224 static void *mcryptd_alloc_instance(struct crypto_alg *alg, unsigned int head,
 225                                    unsigned int tail)
 226 {
 227         char *p;
 228         struct crypto_instance *inst;
 229         int err;
 230
 231         p = kzalloc(head + sizeof(*inst) + tail, GFP_KERNEL);
 232         if (!p)
 233                 return ERR_PTR(-ENOMEM);
 234
 235         inst = (void *)(p + head);
 236
 237         err = -ENAMETOOLONG;
 238         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 239                     "mcryptd(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 240                 goto out_free_inst;
 241
 242         memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
 243
 244         inst->alg.cra_priority = alg->cra_priority + 50;
 245         inst->alg.cra_blocksize = alg->cra_blocksize;
 246         inst->alg.cra_alignmask = alg->cra_alignmask;
 247
 248 out:
 249         return p;
 250
 251 out_free_inst:
 252         kfree(p);
 253         p = ERR_PTR(err);
 254         goto out;
 255 }
 256
 257 static inline void mcryptd_check_internal(struct rtattr **tb, u32 *type,
 258                                           u32 *mask)
 259 {
 260         struct crypto_attr_type *algt;
 261
 262         algt = crypto_get_attr_type(tb);
 263         if (IS_ERR(algt))
 264                 return;
 265         if ((algt->type & CRYPTO_ALG_INTERNAL))
 266                 *type |= CRYPTO_ALG_INTERNAL;
 267         if ((algt->mask & CRYPTO_ALG_INTERNAL))
 268                 *mask |= CRYPTO_ALG_INTERNAL;
 269 }
 270
 271 static int mcryptd_hash_init_tfm(struct crypto_tfm *tfm)
 272 {
 273         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 274         struct hashd_instance_ctx *ictx = crypto_instance_ctx(inst);
 275         struct crypto_shash_spawn *spawn = &ictx->spawn;
 276         struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 277         struct crypto_shash *hash;
 278
 279         hash = crypto_spawn_shash(spawn);
 280         if (IS_ERR(hash))
 281                 return PTR_ERR(hash);
 282
 283         ctx->child = hash;
 284         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 285                                  sizeof(struct mcryptd_hash_request_ctx) +
 286                                  crypto_shash_descsize(hash));
 287         return 0;
 288 }
 289
 290 static void mcryptd_hash_exit_tfm(struct crypto_tfm *tfm)
 291 {
 292         struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 293
 294         crypto_free_shash(ctx->child);
 295 }
 296
 297 static int mcryptd_hash_setkey(struct crypto_ahash *parent,
 298                                    const u8 *key, unsigned int keylen)
 299 {
 300         struct mcryptd_hash_ctx *ctx   = crypto_ahash_ctx(parent);
 301         struct crypto_shash *child = ctx->child;
 302         int err;
 303
 304         crypto_shash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 305         crypto_shash_set_flags(child, crypto_ahash_get_flags(parent) &
 306                                       CRYPTO_TFM_REQ_MASK);
 307         err = crypto_shash_setkey(child, key, keylen);
 308         crypto_ahash_set_flags(parent, crypto_shash_get_flags(child) &
 309                                        CRYPTO_TFM_RES_MASK);
 310         return err;
 311 }
 312
 313 static int mcryptd_hash_enqueue(struct ahash_request *req,
 314                                 crypto_completion_t complete)
 315 {
 316         int ret;
 317
 318         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 319         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 320         struct mcryptd_queue *queue =
 321                 mcryptd_get_queue(crypto_ahash_tfm(tfm));
 322
 323         rctx->complete = req->base.complete;
 324         req->base.complete = complete;
 325
 326         ret = mcryptd_enqueue_request(queue, &req->base, rctx);
 327
 328         return ret;
 329 }
 330
 331 static void mcryptd_hash_init(struct crypto_async_request *req_async, int err)
 332 {
 333         struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 334         struct crypto_shash *child = ctx->child;
 335         struct ahash_request *req = ahash_request_cast(req_async);
 336         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 337         struct shash_desc *desc = &rctx->desc;
 338
 339         if (unlikely(err == -EINPROGRESS))
 340                 goto out;
 341
 342         desc->tfm = child;
 343         desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 344
 345         err = crypto_shash_init(desc);
 346
 347         req->base.complete = rctx->complete;
 348
 349 out:
 350         local_bh_disable();
 351         rctx->complete(&req->base, err);
 352         local_bh_enable();
 353 }
 354
 355 static int mcryptd_hash_init_enqueue(struct ahash_request *req)
 356 {
 357         return mcryptd_hash_enqueue(req, mcryptd_hash_init);
 358 }
 359
 360 static void mcryptd_hash_update(struct crypto_async_request *req_async, int err)
 361 {
 362         struct ahash_request *req = ahash_request_cast(req_async);
 363         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 364
 365         if (unlikely(err == -EINPROGRESS))
 366                 goto out;
 367
 368         err = shash_ahash_mcryptd_update(req, &rctx->desc);
 369         if (err) {
 370                 req->base.complete = rctx->complete;
 371                 goto out;
 372         }
 373
 374         return;
 375 out:
 376         local_bh_disable();
 377         rctx->complete(&req->base, err);
 378         local_bh_enable();
 379 }
 380
 381 static int mcryptd_hash_update_enqueue(struct ahash_request *req)
 382 {
 383         return mcryptd_hash_enqueue(req, mcryptd_hash_update);
 384 }
 385
 386 static void mcryptd_hash_final(struct crypto_async_request *req_async, int err)
 387 {
 388         struct ahash_request *req = ahash_request_cast(req_async);
 389         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 390
 391         if (unlikely(err == -EINPROGRESS))
 392                 goto out;
 393
 394         err = shash_ahash_mcryptd_final(req, &rctx->desc);
 395         if (err) {
 396                 req->base.complete = rctx->complete;
 397                 goto out;
 398         }
 399
 400         return;
 401 out:
 402         local_bh_disable();
 403         rctx->complete(&req->base, err);
 404         local_bh_enable();
 405 }
 406
 407 static int mcryptd_hash_final_enqueue(struct ahash_request *req)
 408 {
 409         return mcryptd_hash_enqueue(req, mcryptd_hash_final);
 410 }
 411
 412 static void mcryptd_hash_finup(struct crypto_async_request *req_async, int err)
 413 {
 414         struct ahash_request *req = ahash_request_cast(req_async);
 415         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 416
 417         if (unlikely(err == -EINPROGRESS))
 418                 goto out;
 419
 420         err = shash_ahash_mcryptd_finup(req, &rctx->desc);
 421
 422         if (err) {
 423                 req->base.complete = rctx->complete;
 424                 goto out;
 425         }
 426
 427         return;
 428 out:
 429         local_bh_disable();
 430         rctx->complete(&req->base, err);
 431         local_bh_enable();
 432 }
 433
 434 static int mcryptd_hash_finup_enqueue(struct ahash_request *req)
 435 {
 436         return mcryptd_hash_enqueue(req, mcryptd_hash_finup);
 437 }
 438
 439 static void mcryptd_hash_digest(struct crypto_async_request *req_async, int err)
 440 {
 441         struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 442         struct crypto_shash *child = ctx->child;
 443         struct ahash_request *req = ahash_request_cast(req_async);
 444         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 445         struct shash_desc *desc = &rctx->desc;
 446
 447         if (unlikely(err == -EINPROGRESS))
 448                 goto out;
 449
 450         desc->tfm = child;
 451         desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;  /* check this again */
 452
 453         err = shash_ahash_mcryptd_digest(req, desc);
 454
 455         if (err) {
 456                 req->base.complete = rctx->complete;
 457                 goto out;
 458         }
 459
 460         return;
 461 out:
 462         local_bh_disable();
 463         rctx->complete(&req->base, err);
 464         local_bh_enable();
 465 }
 466
 467 static int mcryptd_hash_digest_enqueue(struct ahash_request *req)
 468 {
 469         return mcryptd_hash_enqueue(req, mcryptd_hash_digest);
 470 }
 471
 472 static int mcryptd_hash_export(struct ahash_request *req, void *out)
 473 {
 474         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 475
 476         return crypto_shash_export(&rctx->desc, out);
 477 }
 478
 479 static int mcryptd_hash_import(struct ahash_request *req, const void *in)
 480 {
 481         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 482
 483         return crypto_shash_import(&rctx->desc, in);
 484 }
 485
 486 static int mcryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,
 487                               struct mcryptd_queue *queue)
 488 {
 489         struct hashd_instance_ctx *ctx;
 490         struct ahash_instance *inst;
 491         struct shash_alg *salg;
 492         struct crypto_alg *alg;
 493         u32 type = 0;
 494         u32 mask = 0;
 495         int err;
 496
 497         mcryptd_check_internal(tb, &type, &mask);
 498
 499         salg = shash_attr_alg(tb[1], type, mask);
 500         if (IS_ERR(salg))
 501                 return PTR_ERR(salg);
 502
 503         alg = &salg->base;
 504         pr_debug("crypto: mcryptd hash alg: %s\n", alg->cra_name);
 505         inst = mcryptd_alloc_instance(alg, ahash_instance_headroom(),
 506                                         sizeof(*ctx));
 507         err = PTR_ERR(inst);
 508         if (IS_ERR(inst))
 509                 goto out_put_alg;
 510
 511         ctx = ahash_instance_ctx(inst);
 512         ctx->queue = queue;
 513
 514         err = crypto_init_shash_spawn(&ctx->spawn, salg,
 515                                       ahash_crypto_instance(inst));
 516         if (err)
 517                 goto out_free_inst;
 518
 519         type = CRYPTO_ALG_ASYNC;
 520         if (alg->cra_flags & CRYPTO_ALG_INTERNAL)
 521                 type |= CRYPTO_ALG_INTERNAL;
 522         inst->alg.halg.base.cra_flags = type;
 523
 524         inst->alg.halg.digestsize = salg->digestsize;
 525         inst->alg.halg.statesize = salg->statesize;
 526         inst->alg.halg.base.cra_ctxsize = sizeof(struct mcryptd_hash_ctx);
 527
 528         inst->alg.halg.base.cra_init = mcryptd_hash_init_tfm;
 529         inst->alg.halg.base.cra_exit = mcryptd_hash_exit_tfm;
 530
 531         inst->alg.init   = mcryptd_hash_init_enqueue;
 532         inst->alg.update = mcryptd_hash_update_enqueue;
 533         inst->alg.final  = mcryptd_hash_final_enqueue;
 534         inst->alg.finup  = mcryptd_hash_finup_enqueue;
 535         inst->alg.export = mcryptd_hash_export;
 536         inst->alg.import = mcryptd_hash_import;
 537         inst->alg.setkey = mcryptd_hash_setkey;
 538         inst->alg.digest = mcryptd_hash_digest_enqueue;
 539
 540         err = ahash_register_instance(tmpl, inst);
 541         if (err) {
 542                 crypto_drop_shash(&ctx->spawn);
 543 out_free_inst:
 544                 kfree(inst);
 545         }
 546
 547 out_put_alg:
 548         crypto_mod_put(alg);
 549         return err;
 550 }
 551
 552 static struct mcryptd_queue mqueue;
 553
 554 static int mcryptd_create(struct crypto_template *tmpl, struct rtattr **tb)
 555 {
 556         struct crypto_attr_type *algt;
 557
 558         algt = crypto_get_attr_type(tb);
 559         if (IS_ERR(algt))
 560                 return PTR_ERR(algt);
 561
 562         switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
 563         case CRYPTO_ALG_TYPE_DIGEST:
 564                 return mcryptd_create_hash(tmpl, tb, &mqueue);
 565         break;
 566         }
 567
 568         return -EINVAL;
 569 }
 570
 571 static void mcryptd_free(struct crypto_instance *inst)
 572 {
 573         struct mcryptd_instance_ctx *ctx = crypto_instance_ctx(inst);
 574         struct hashd_instance_ctx *hctx = crypto_instance_ctx(inst);
 575
 576         switch (inst->alg.cra_flags & CRYPTO_ALG_TYPE_MASK) {
 577         case CRYPTO_ALG_TYPE_AHASH:
 578                 crypto_drop_shash(&hctx->spawn);
 579                 kfree(ahash_instance(inst));
 580                 return;
 581         default:
 582                 crypto_drop_spawn(&ctx->spawn);
 583                 kfree(inst);
 584         }
 585 }
 586
 587 static struct crypto_template mcryptd_tmpl = {
 588         .name = "mcryptd",
 589         .create = mcryptd_create,
 590         .free = mcryptd_free,
 591         .module = THIS_MODULE,
 592 };
 593
 594 struct mcryptd_ahash *mcryptd_alloc_ahash(const char *alg_name,
 595                                         u32 type, u32 mask)
 596 {
 597         char mcryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 598         struct crypto_ahash *tfm;
 599
 600         if (snprintf(mcryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 601                      "mcryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 602                 return ERR_PTR(-EINVAL);
 603         tfm = crypto_alloc_ahash(mcryptd_alg_name, type, mask);
 604         if (IS_ERR(tfm))
 605                 return ERR_CAST(tfm);
 606         if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
 607                 crypto_free_ahash(tfm);
 608                 return ERR_PTR(-EINVAL);
 609         }
 610
 611         return __mcryptd_ahash_cast(tfm);
 612 }
 613 EXPORT_SYMBOL_GPL(mcryptd_alloc_ahash);
 614
 615 int shash_ahash_mcryptd_digest(struct ahash_request *req,
 616                                struct shash_desc *desc)
 617 {
 618         int err;
 619
 620         err = crypto_shash_init(desc) ?:
 621               shash_ahash_mcryptd_finup(req, desc);
 622
 623         return err;
 624 }
 625 EXPORT_SYMBOL_GPL(shash_ahash_mcryptd_digest);
 626
 627 int shash_ahash_mcryptd_update(struct ahash_request *req,
 628                                struct shash_desc *desc)
 629 {
 630         struct crypto_shash *tfm = desc->tfm;
 631         struct shash_alg *shash = crypto_shash_alg(tfm);
 632
 633         /* alignment is to be done by multi-buffer crypto algorithm if needed */
 634
 635         return shash->update(desc, NULL, 0);
 636 }
 637 EXPORT_SYMBOL_GPL(shash_ahash_mcryptd_update);
 638
 639 int shash_ahash_mcryptd_finup(struct ahash_request *req,
 640                               struct shash_desc *desc)
 641 {
 642         struct crypto_shash *tfm = desc->tfm;
 643         struct shash_alg *shash = crypto_shash_alg(tfm);
 644
 645         /* alignment is to be done by multi-buffer crypto algorithm if needed */
 646
 647         return shash->finup(desc, NULL, 0, req->result);
 648 }
 649 EXPORT_SYMBOL_GPL(shash_ahash_mcryptd_finup);
 650
 651 int shash_ahash_mcryptd_final(struct ahash_request *req,
 652                               struct shash_desc *desc)
 653 {
 654         struct crypto_shash *tfm = desc->tfm;
 655         struct shash_alg *shash = crypto_shash_alg(tfm);
 656
 657         /* alignment is to be done by multi-buffer crypto algorithm if needed */
 658
 659         return shash->final(desc, req->result);
 660 }
 661 EXPORT_SYMBOL_GPL(shash_ahash_mcryptd_final);
 662
 663 struct crypto_shash *mcryptd_ahash_child(struct mcryptd_ahash *tfm)
 664 {
 665         struct mcryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
 666
 667         return ctx->child;
 668 }
 669 EXPORT_SYMBOL_GPL(mcryptd_ahash_child);
 670
 671 struct shash_desc *mcryptd_shash_desc(struct ahash_request *req)
 672 {
 673         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 674         return &rctx->desc;
 675 }
 676 EXPORT_SYMBOL_GPL(mcryptd_shash_desc);
 677
 678 void mcryptd_free_ahash(struct mcryptd_ahash *tfm)
 679 {
 680         crypto_free_ahash(&tfm->base);
 681 }
 682 EXPORT_SYMBOL_GPL(mcryptd_free_ahash);
 683
 684
 685 static int __init mcryptd_init(void)
 686 {
 687         int err, cpu;
 688         struct mcryptd_flush_list *flist;
 689
 690         mcryptd_flist = alloc_percpu(struct mcryptd_flush_list);
 691         for_each_possible_cpu(cpu) {
 692                 flist = per_cpu_ptr(mcryptd_flist, cpu);
 693                 INIT_LIST_HEAD(&flist->list);
 694                 mutex_init(&flist->lock);
 695         }
 696
 697         err = mcryptd_init_queue(&mqueue, MCRYPTD_MAX_CPU_QLEN);
 698         if (err) {
 699                 free_percpu(mcryptd_flist);
 700                 return err;
 701         }
 702
 703         err = crypto_register_template(&mcryptd_tmpl);
 704         if (err) {
 705                 mcryptd_fini_queue(&mqueue);
 706                 free_percpu(mcryptd_flist);
 707         }
 708
 709         return err;
 710 }
 711
 712 static void __exit mcryptd_exit(void)
 713 {
 714         mcryptd_fini_queue(&mqueue);
 715         crypto_unregister_template(&mcryptd_tmpl);
 716         free_percpu(mcryptd_flist);
 717 }
 718
 719 subsys_initcall(mcryptd_init);
 720 module_exit(mcryptd_exit);
 721
 722 MODULE_LICENSE("GPL");
 723 MODULE_DESCRIPTION("Software async multibuffer crypto daemon");
 724 MODULE_ALIAS_CRYPTO("mcryptd");