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                 spin_lock_init(&cpu_queue->q_lock);
  84         }
  85         return 0;
  86 }
  87
  88 static void mcryptd_fini_queue(struct mcryptd_queue *queue)
  89 {
  90         int cpu;
  91         struct mcryptd_cpu_queue *cpu_queue;
  92
  93         for_each_possible_cpu(cpu) {
  94                 cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
  95                 BUG_ON(cpu_queue->queue.qlen);
  96         }
  97         free_percpu(queue->cpu_queue);
  98 }
  99
 100 static int mcryptd_enqueue_request(struct mcryptd_queue *queue,
 101                                   struct crypto_async_request *request,
 102                                   struct mcryptd_hash_request_ctx *rctx)
 103 {
 104         int cpu, err;
 105         struct mcryptd_cpu_queue *cpu_queue;
 106
 107         cpu_queue = raw_cpu_ptr(queue->cpu_queue);
 108         spin_lock(&cpu_queue->q_lock);
 109         cpu = smp_processor_id();
 110         rctx->tag.cpu = smp_processor_id();
 111
 112         err = crypto_enqueue_request(&cpu_queue->queue, request);
 113         pr_debug("enqueue request: cpu %d cpu_queue %p request %p\n",
 114                  cpu, cpu_queue, request);
 115         spin_unlock(&cpu_queue->q_lock);
 116         queue_work_on(cpu, kcrypto_wq, &cpu_queue->work);
 117
 118         return err;
 119 }
 120
 121 /*
 122  * Try to opportunisticlly flush the partially completed jobs if
 123  * crypto daemon is the only task running.
 124  */
 125 static void mcryptd_opportunistic_flush(void)
 126 {
 127         struct mcryptd_flush_list *flist;
 128         struct mcryptd_alg_cstate *cstate;
 129
 130         flist = per_cpu_ptr(mcryptd_flist, smp_processor_id());
 131         while (single_task_running()) {
 132                 mutex_lock(&flist->lock);
 133                 if (list_empty(&flist->list)) {
 134                         mutex_unlock(&flist->lock);
 135                         return;
 136                 }
 137                 cstate = list_entry(flist->list.next,
 138                                 struct mcryptd_alg_cstate, flush_list);
 139                 if (!cstate->flusher_engaged) {
 140                         mutex_unlock(&flist->lock);
 141                         return;
 142                 }
 143                 list_del(&cstate->flush_list);
 144                 cstate->flusher_engaged = false;
 145                 mutex_unlock(&flist->lock);
 146                 cstate->alg_state->flusher(cstate);
 147         }
 148 }
 149
 150 /*
 151  * Called in workqueue context, do one real cryption work (via
 152  * req->complete) and reschedule itself if there are more work to
 153  * do.
 154  */
 155 static void mcryptd_queue_worker(struct work_struct *work)
 156 {
 157         struct mcryptd_cpu_queue *cpu_queue;
 158         struct crypto_async_request *req, *backlog;
 159         int i;
 160
 161         /*
 162          * Need to loop through more than once for multi-buffer to
 163          * be effective.
 164          */
 165
 166         cpu_queue = container_of(work, struct mcryptd_cpu_queue, work);
 167         i = 0;
 168         while (i < MCRYPTD_BATCH || single_task_running()) {
 169
 170                 spin_lock_bh(&cpu_queue->q_lock);
 171                 backlog = crypto_get_backlog(&cpu_queue->queue);
 172                 req = crypto_dequeue_request(&cpu_queue->queue);
 173                 spin_unlock_bh(&cpu_queue->q_lock);
 174
 175                 if (!req) {
 176                         mcryptd_opportunistic_flush();
 177                         return;
 178                 }
 179
 180                 if (backlog)
 181                         backlog->complete(backlog, -EINPROGRESS);
 182                 req->complete(req, 0);
 183                 if (!cpu_queue->queue.qlen)
 184                         return;
 185                 ++i;
 186         }
 187         if (cpu_queue->queue.qlen)
 188                 queue_work_on(smp_processor_id(), kcrypto_wq, &cpu_queue->work);
 189 }
 190
 191 void mcryptd_flusher(struct work_struct *__work)
 192 {
 193         struct  mcryptd_alg_cstate      *alg_cpu_state;
 194         struct  mcryptd_alg_state       *alg_state;
 195         struct  mcryptd_flush_list      *flist;
 196         int     cpu;
 197
 198         cpu = smp_processor_id();
 199         alg_cpu_state = container_of(to_delayed_work(__work),
 200                                      struct mcryptd_alg_cstate, flush);
 201         alg_state = alg_cpu_state->alg_state;
 202         if (alg_cpu_state->cpu != cpu)
 203                 pr_debug("mcryptd error: work on cpu %d, should be cpu %d\n",
 204                                 cpu, alg_cpu_state->cpu);
 205
 206         if (alg_cpu_state->flusher_engaged) {
 207                 flist = per_cpu_ptr(mcryptd_flist, cpu);
 208                 mutex_lock(&flist->lock);
 209                 list_del(&alg_cpu_state->flush_list);
 210                 alg_cpu_state->flusher_engaged = false;
 211                 mutex_unlock(&flist->lock);
 212                 alg_state->flusher(alg_cpu_state);
 213         }
 214 }
 215 EXPORT_SYMBOL_GPL(mcryptd_flusher);
 216
 217 static inline struct mcryptd_queue *mcryptd_get_queue(struct crypto_tfm *tfm)
 218 {
 219         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 220         struct mcryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
 221
 222         return ictx->queue;
 223 }
 224
 225 static void *mcryptd_alloc_instance(struct crypto_alg *alg, unsigned int head,
 226                                    unsigned int tail)
 227 {
 228         char *p;
 229         struct crypto_instance *inst;
 230         int err;
 231
 232         p = kzalloc(head + sizeof(*inst) + tail, GFP_KERNEL);
 233         if (!p)
 234                 return ERR_PTR(-ENOMEM);
 235
 236         inst = (void *)(p + head);
 237
 238         err = -ENAMETOOLONG;
 239         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 240                     "mcryptd(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 241                 goto out_free_inst;
 242
 243         memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
 244
 245         inst->alg.cra_priority = alg->cra_priority + 50;
 246         inst->alg.cra_blocksize = alg->cra_blocksize;
 247         inst->alg.cra_alignmask = alg->cra_alignmask;
 248
 249 out:
 250         return p;
 251
 252 out_free_inst:
 253         kfree(p);
 254         p = ERR_PTR(err);
 255         goto out;
 256 }
 257
 258 static inline bool mcryptd_check_internal(struct rtattr **tb, u32 *type,
 259                                           u32 *mask)
 260 {
 261         struct crypto_attr_type *algt;
 262
 263         algt = crypto_get_attr_type(tb);
 264         if (IS_ERR(algt))
 265                 return false;
 266
 267         *type |= algt->type & CRYPTO_ALG_INTERNAL;
 268         *mask |= algt->mask & CRYPTO_ALG_INTERNAL;
 269
 270         if (*type & *mask & CRYPTO_ALG_INTERNAL)
 271                 return true;
 272         else
 273                 return false;
 274 }
 275
 276 static int mcryptd_hash_init_tfm(struct crypto_tfm *tfm)
 277 {
 278         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 279         struct hashd_instance_ctx *ictx = crypto_instance_ctx(inst);
 280         struct crypto_shash_spawn *spawn = &ictx->spawn;
 281         struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 282         struct crypto_shash *hash;
 283
 284         hash = crypto_spawn_shash(spawn);
 285         if (IS_ERR(hash))
 286                 return PTR_ERR(hash);
 287
 288         ctx->child = hash;
 289         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 290                                  sizeof(struct mcryptd_hash_request_ctx) +
 291                                  crypto_shash_descsize(hash));
 292         return 0;
 293 }
 294
 295 static void mcryptd_hash_exit_tfm(struct crypto_tfm *tfm)
 296 {
 297         struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 298
 299         crypto_free_shash(ctx->child);
 300 }
 301
 302 static int mcryptd_hash_setkey(struct crypto_ahash *parent,
 303                                    const u8 *key, unsigned int keylen)
 304 {
 305         struct mcryptd_hash_ctx *ctx   = crypto_ahash_ctx(parent);
 306         struct crypto_shash *child = ctx->child;
 307         int err;
 308
 309         crypto_shash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 310         crypto_shash_set_flags(child, crypto_ahash_get_flags(parent) &
 311                                       CRYPTO_TFM_REQ_MASK);
 312         err = crypto_shash_setkey(child, key, keylen);
 313         crypto_ahash_set_flags(parent, crypto_shash_get_flags(child) &
 314                                        CRYPTO_TFM_RES_MASK);
 315         return err;
 316 }
 317
 318 static int mcryptd_hash_enqueue(struct ahash_request *req,
 319                                 crypto_completion_t complete)
 320 {
 321         int ret;
 322
 323         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 324         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 325         struct mcryptd_queue *queue =
 326                 mcryptd_get_queue(crypto_ahash_tfm(tfm));
 327
 328         rctx->complete = req->base.complete;
 329         req->base.complete = complete;
 330
 331         ret = mcryptd_enqueue_request(queue, &req->base, rctx);
 332
 333         return ret;
 334 }
 335
 336 static void mcryptd_hash_init(struct crypto_async_request *req_async, int err)
 337 {
 338         struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 339         struct crypto_shash *child = ctx->child;
 340         struct ahash_request *req = ahash_request_cast(req_async);
 341         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 342         struct shash_desc *desc = &rctx->desc;
 343
 344         if (unlikely(err == -EINPROGRESS))
 345                 goto out;
 346
 347         desc->tfm = child;
 348         desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 349
 350         err = crypto_shash_init(desc);
 351
 352         req->base.complete = rctx->complete;
 353
 354 out:
 355         local_bh_disable();
 356         rctx->complete(&req->base, err);
 357         local_bh_enable();
 358 }
 359
 360 static int mcryptd_hash_init_enqueue(struct ahash_request *req)
 361 {
 362         return mcryptd_hash_enqueue(req, mcryptd_hash_init);
 363 }
 364
 365 static void mcryptd_hash_update(struct crypto_async_request *req_async, int err)
 366 {
 367         struct ahash_request *req = ahash_request_cast(req_async);
 368         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 369
 370         if (unlikely(err == -EINPROGRESS))
 371                 goto out;
 372
 373         err = shash_ahash_mcryptd_update(req, &rctx->desc);
 374         if (err) {
 375                 req->base.complete = rctx->complete;
 376                 goto out;
 377         }
 378
 379         return;
 380 out:
 381         local_bh_disable();
 382         rctx->complete(&req->base, err);
 383         local_bh_enable();
 384 }
 385
 386 static int mcryptd_hash_update_enqueue(struct ahash_request *req)
 387 {
 388         return mcryptd_hash_enqueue(req, mcryptd_hash_update);
 389 }
 390
 391 static void mcryptd_hash_final(struct crypto_async_request *req_async, int err)
 392 {
 393         struct ahash_request *req = ahash_request_cast(req_async);
 394         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 395
 396         if (unlikely(err == -EINPROGRESS))
 397                 goto out;
 398
 399         err = shash_ahash_mcryptd_final(req, &rctx->desc);
 400         if (err) {
 401                 req->base.complete = rctx->complete;
 402                 goto out;
 403         }
 404
 405         return;
 406 out:
 407         local_bh_disable();
 408         rctx->complete(&req->base, err);
 409         local_bh_enable();
 410 }
 411
 412 static int mcryptd_hash_final_enqueue(struct ahash_request *req)
 413 {
 414         return mcryptd_hash_enqueue(req, mcryptd_hash_final);
 415 }
 416
 417 static void mcryptd_hash_finup(struct crypto_async_request *req_async, int err)
 418 {
 419         struct ahash_request *req = ahash_request_cast(req_async);
 420         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 421
 422         if (unlikely(err == -EINPROGRESS))
 423                 goto out;
 424
 425         err = shash_ahash_mcryptd_finup(req, &rctx->desc);
 426
 427         if (err) {
 428                 req->base.complete = rctx->complete;
 429                 goto out;
 430         }
 431
 432         return;
 433 out:
 434         local_bh_disable();
 435         rctx->complete(&req->base, err);
 436         local_bh_enable();
 437 }
 438
 439 static int mcryptd_hash_finup_enqueue(struct ahash_request *req)
 440 {
 441         return mcryptd_hash_enqueue(req, mcryptd_hash_finup);
 442 }
 443
 444 static void mcryptd_hash_digest(struct crypto_async_request *req_async, int err)
 445 {
 446         struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 447         struct crypto_shash *child = ctx->child;
 448         struct ahash_request *req = ahash_request_cast(req_async);
 449         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 450         struct shash_desc *desc = &rctx->desc;
 451
 452         if (unlikely(err == -EINPROGRESS))
 453                 goto out;
 454
 455         desc->tfm = child;
 456         desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;  /* check this again */
 457
 458         err = shash_ahash_mcryptd_digest(req, desc);
 459
 460         if (err) {
 461                 req->base.complete = rctx->complete;
 462                 goto out;
 463         }
 464
 465         return;
 466 out:
 467         local_bh_disable();
 468         rctx->complete(&req->base, err);
 469         local_bh_enable();
 470 }
 471
 472 static int mcryptd_hash_digest_enqueue(struct ahash_request *req)
 473 {
 474         return mcryptd_hash_enqueue(req, mcryptd_hash_digest);
 475 }
 476
 477 static int mcryptd_hash_export(struct ahash_request *req, void *out)
 478 {
 479         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 480
 481         return crypto_shash_export(&rctx->desc, out);
 482 }
 483
 484 static int mcryptd_hash_import(struct ahash_request *req, const void *in)
 485 {
 486         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 487
 488         return crypto_shash_import(&rctx->desc, in);
 489 }
 490
 491 static int mcryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,
 492                               struct mcryptd_queue *queue)
 493 {
 494         struct hashd_instance_ctx *ctx;
 495         struct ahash_instance *inst;
 496         struct shash_alg *salg;
 497         struct crypto_alg *alg;
 498         u32 type = 0;
 499         u32 mask = 0;
 500         int err;
 501
 502         if (!mcryptd_check_internal(tb, &type, &mask))
 503                 return -EINVAL;
 504
 505         salg = shash_attr_alg(tb[1], type, mask);
 506         if (IS_ERR(salg))
 507                 return PTR_ERR(salg);
 508
 509         alg = &salg->base;
 510         pr_debug("crypto: mcryptd hash alg: %s\n", alg->cra_name);
 511         inst = mcryptd_alloc_instance(alg, ahash_instance_headroom(),
 512                                         sizeof(*ctx));
 513         err = PTR_ERR(inst);
 514         if (IS_ERR(inst))
 515                 goto out_put_alg;
 516
 517         ctx = ahash_instance_ctx(inst);
 518         ctx->queue = queue;
 519
 520         err = crypto_init_shash_spawn(&ctx->spawn, salg,
 521                                       ahash_crypto_instance(inst));
 522         if (err)
 523                 goto out_free_inst;
 524
 525         type = CRYPTO_ALG_ASYNC;
 526         if (alg->cra_flags & CRYPTO_ALG_INTERNAL)
 527                 type |= CRYPTO_ALG_INTERNAL;
 528         inst->alg.halg.base.cra_flags = type;
 529
 530         inst->alg.halg.digestsize = salg->digestsize;
 531         inst->alg.halg.statesize = salg->statesize;
 532         inst->alg.halg.base.cra_ctxsize = sizeof(struct mcryptd_hash_ctx);
 533
 534         inst->alg.halg.base.cra_init = mcryptd_hash_init_tfm;
 535         inst->alg.halg.base.cra_exit = mcryptd_hash_exit_tfm;
 536
 537         inst->alg.init   = mcryptd_hash_init_enqueue;
 538         inst->alg.update = mcryptd_hash_update_enqueue;
 539         inst->alg.final  = mcryptd_hash_final_enqueue;
 540         inst->alg.finup  = mcryptd_hash_finup_enqueue;
 541         inst->alg.export = mcryptd_hash_export;
 542         inst->alg.import = mcryptd_hash_import;
 543         inst->alg.setkey = mcryptd_hash_setkey;
 544         inst->alg.digest = mcryptd_hash_digest_enqueue;
 545
 546         err = ahash_register_instance(tmpl, inst);
 547         if (err) {
 548                 crypto_drop_shash(&ctx->spawn);
 549 out_free_inst:
 550                 kfree(inst);
 551         }
 552
 553 out_put_alg:
 554         crypto_mod_put(alg);
 555         return err;
 556 }
 557
 558 static struct mcryptd_queue mqueue;
 559
 560 static int mcryptd_create(struct crypto_template *tmpl, struct rtattr **tb)
 561 {
 562         struct crypto_attr_type *algt;
 563
 564         algt = crypto_get_attr_type(tb);
 565         if (IS_ERR(algt))
 566                 return PTR_ERR(algt);
 567
 568         switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
 569         case CRYPTO_ALG_TYPE_DIGEST:
 570                 return mcryptd_create_hash(tmpl, tb, &mqueue);
 571         break;
 572         }
 573
 574         return -EINVAL;
 575 }
 576
 577 static void mcryptd_free(struct crypto_instance *inst)
 578 {
 579         struct mcryptd_instance_ctx *ctx = crypto_instance_ctx(inst);
 580         struct hashd_instance_ctx *hctx = crypto_instance_ctx(inst);
 581
 582         switch (inst->alg.cra_flags & CRYPTO_ALG_TYPE_MASK) {
 583         case CRYPTO_ALG_TYPE_AHASH:
 584                 crypto_drop_shash(&hctx->spawn);
 585                 kfree(ahash_instance(inst));
 586                 return;
 587         default:
 588                 crypto_drop_spawn(&ctx->spawn);
 589                 kfree(inst);
 590         }
 591 }
 592
 593 static struct crypto_template mcryptd_tmpl = {
 594         .name = "mcryptd",
 595         .create = mcryptd_create,
 596         .free = mcryptd_free,
 597         .module = THIS_MODULE,
 598 };
 599
 600 struct mcryptd_ahash *mcryptd_alloc_ahash(const char *alg_name,
 601                                         u32 type, u32 mask)
 602 {
 603         char mcryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 604         struct crypto_ahash *tfm;
 605
 606         if (snprintf(mcryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 607                      "mcryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 608                 return ERR_PTR(-EINVAL);
 609         tfm = crypto_alloc_ahash(mcryptd_alg_name, type, mask);
 610         if (IS_ERR(tfm))
 611                 return ERR_CAST(tfm);
 612         if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
 613                 crypto_free_ahash(tfm);
 614                 return ERR_PTR(-EINVAL);
 615         }
 616
 617         return __mcryptd_ahash_cast(tfm);
 618 }
 619 EXPORT_SYMBOL_GPL(mcryptd_alloc_ahash);
 620
 621 int shash_ahash_mcryptd_digest(struct ahash_request *req,
 622                                struct shash_desc *desc)
 623 {
 624         int err;
 625
 626         err = crypto_shash_init(desc) ?:
 627               shash_ahash_mcryptd_finup(req, desc);
 628
 629         return err;
 630 }
 631 EXPORT_SYMBOL_GPL(shash_ahash_mcryptd_digest);
 632
 633 int shash_ahash_mcryptd_update(struct ahash_request *req,
 634                                struct shash_desc *desc)
 635 {
 636         struct crypto_shash *tfm = desc->tfm;
 637         struct shash_alg *shash = crypto_shash_alg(tfm);
 638
 639         /* alignment is to be done by multi-buffer crypto algorithm if needed */
 640
 641         return shash->update(desc, NULL, 0);
 642 }
 643 EXPORT_SYMBOL_GPL(shash_ahash_mcryptd_update);
 644
 645 int shash_ahash_mcryptd_finup(struct ahash_request *req,
 646                               struct shash_desc *desc)
 647 {
 648         struct crypto_shash *tfm = desc->tfm;
 649         struct shash_alg *shash = crypto_shash_alg(tfm);
 650
 651         /* alignment is to be done by multi-buffer crypto algorithm if needed */
 652
 653         return shash->finup(desc, NULL, 0, req->result);
 654 }
 655 EXPORT_SYMBOL_GPL(shash_ahash_mcryptd_finup);
 656
 657 int shash_ahash_mcryptd_final(struct ahash_request *req,
 658                               struct shash_desc *desc)
 659 {
 660         struct crypto_shash *tfm = desc->tfm;
 661         struct shash_alg *shash = crypto_shash_alg(tfm);
 662
 663         /* alignment is to be done by multi-buffer crypto algorithm if needed */
 664
 665         return shash->final(desc, req->result);
 666 }
 667 EXPORT_SYMBOL_GPL(shash_ahash_mcryptd_final);
 668
 669 struct crypto_shash *mcryptd_ahash_child(struct mcryptd_ahash *tfm)
 670 {
 671         struct mcryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
 672
 673         return ctx->child;
 674 }
 675 EXPORT_SYMBOL_GPL(mcryptd_ahash_child);
 676
 677 struct shash_desc *mcryptd_shash_desc(struct ahash_request *req)
 678 {
 679         struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 680         return &rctx->desc;
 681 }
 682 EXPORT_SYMBOL_GPL(mcryptd_shash_desc);
 683
 684 void mcryptd_free_ahash(struct mcryptd_ahash *tfm)
 685 {
 686         crypto_free_ahash(&tfm->base);
 687 }
 688 EXPORT_SYMBOL_GPL(mcryptd_free_ahash);
 689
 690
 691 static int __init mcryptd_init(void)
 692 {
 693         int err, cpu;
 694         struct mcryptd_flush_list *flist;
 695
 696         mcryptd_flist = alloc_percpu(struct mcryptd_flush_list);
 697         for_each_possible_cpu(cpu) {
 698                 flist = per_cpu_ptr(mcryptd_flist, cpu);
 699                 INIT_LIST_HEAD(&flist->list);
 700                 mutex_init(&flist->lock);
 701         }
 702
 703         err = mcryptd_init_queue(&mqueue, MCRYPTD_MAX_CPU_QLEN);
 704         if (err) {
 705                 free_percpu(mcryptd_flist);
 706                 return err;
 707         }
 708
 709         err = crypto_register_template(&mcryptd_tmpl);
 710         if (err) {
 711                 mcryptd_fini_queue(&mqueue);
 712                 free_percpu(mcryptd_flist);
 713         }
 714
 715         return err;
 716 }
 717
 718 static void __exit mcryptd_exit(void)
 719 {
 720         mcryptd_fini_queue(&mqueue);
 721         crypto_unregister_template(&mcryptd_tmpl);
 722         free_percpu(mcryptd_flist);
 723 }
 724
 725 subsys_initcall(mcryptd_init);
 726 module_exit(mcryptd_exit);
 727
 728 MODULE_LICENSE("GPL");
 729 MODULE_DESCRIPTION("Software async multibuffer crypto daemon");
 730 MODULE_ALIAS_CRYPTO("mcryptd");