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