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