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        /*
 141         * Only handle one request at a time to avoid hogging crypto workqueue.
 142         * preempt_disable/enable is used to prevent being preempted by
 143         * cryptd_enqueue_request(). local_bh_disable/enable is used to prevent
 144         * cryptd_enqueue_request() being accessed from software interrupts.
 145         */
 146        local_bh_disable();
 147        preempt_disable();
 148        backlog = crypto_get_backlog(&cpu_queue->queue);
 149        req = crypto_dequeue_request(&cpu_queue->queue);
 150        preempt_enable();
 151        local_bh_enable();
 152
 153        if (!req)
 154                return;
 155
 156        if (backlog)
 157                backlog->complete(backlog, -EINPROGRESS);
 158        req->complete(req, 0);
 159
 160        if (cpu_queue->queue.qlen)
 161                queue_work(kcrypto_wq, &cpu_queue->work);
 162}
 163
 164static inline struct cryptd_queue *cryptd_get_queue(struct crypto_tfm *tfm)
 165{
 166        struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 167        struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
 168        return ictx->queue;
 169}
 170
 171static int cryptd_blkcipher_setkey(struct crypto_ablkcipher *parent,
 172                                   const u8 *key, unsigned int keylen)
 173{
 174        struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(parent);
 175        struct crypto_blkcipher *child = ctx->child;
 176        int err;
 177
 178        crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 179        crypto_blkcipher_set_flags(child, crypto_ablkcipher_get_flags(parent) &
 180                                          CRYPTO_TFM_REQ_MASK);
 181        err = crypto_blkcipher_setkey(child, key, keylen);
 182        crypto_ablkcipher_set_flags(parent, crypto_blkcipher_get_flags(child) &
 183                                            CRYPTO_TFM_RES_MASK);
 184        return err;
 185}
 186
 187static void cryptd_blkcipher_crypt(struct ablkcipher_request *req,
 188                                   struct crypto_blkcipher *child,
 189                                   int err,
 190                                   int (*crypt)(struct blkcipher_desc *desc,
 191                                                struct scatterlist *dst,
 192                                                struct scatterlist *src,
 193                                                unsigned int len))
 194{
 195        struct cryptd_blkcipher_request_ctx *rctx;
 196        struct blkcipher_desc desc;
 197
 198        rctx = ablkcipher_request_ctx(req);
 199
 200        if (unlikely(err == -EINPROGRESS))
 201                goto out;
 202
 203        desc.tfm = child;
 204        desc.info = req->info;
 205        desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 206
 207        err = crypt(&desc, req->dst, req->src, req->nbytes);
 208
 209        req->base.complete = rctx->complete;
 210
 211out:
 212        local_bh_disable();
 213        rctx->complete(&req->base, err);
 214        local_bh_enable();
 215}
 216
 217static void cryptd_blkcipher_encrypt(struct crypto_async_request *req, int err)
 218{
 219        struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
 220        struct crypto_blkcipher *child = ctx->child;
 221
 222        cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
 223                               crypto_blkcipher_crt(child)->encrypt);
 224}
 225
 226static void cryptd_blkcipher_decrypt(struct crypto_async_request *req, int err)
 227{
 228        struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
 229        struct crypto_blkcipher *child = ctx->child;
 230
 231        cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
 232                               crypto_blkcipher_crt(child)->decrypt);
 233}
 234
 235static int cryptd_blkcipher_enqueue(struct ablkcipher_request *req,
 236                                    crypto_completion_t complete)
 237{
 238        struct cryptd_blkcipher_request_ctx *rctx = ablkcipher_request_ctx(req);
 239        struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
 240        struct cryptd_queue *queue;
 241
 242        queue = cryptd_get_queue(crypto_ablkcipher_tfm(tfm));
 243        rctx->complete = req->base.complete;
 244        req->base.complete = complete;
 245
 246        return cryptd_enqueue_request(queue, &req->base);
 247}
 248
 249static int cryptd_blkcipher_encrypt_enqueue(struct ablkcipher_request *req)
 250{
 251        return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_encrypt);
 252}
 253
 254static int cryptd_blkcipher_decrypt_enqueue(struct ablkcipher_request *req)
 255{
 256        return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_decrypt);
 257}
 258
 259static int cryptd_blkcipher_init_tfm(struct crypto_tfm *tfm)
 260{
 261        struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 262        struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
 263        struct crypto_spawn *spawn = &ictx->spawn;
 264        struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
 265        struct crypto_blkcipher *cipher;
 266
 267        cipher = crypto_spawn_blkcipher(spawn);
 268        if (IS_ERR(cipher))
 269                return PTR_ERR(cipher);
 270
 271        ctx->child = cipher;
 272        tfm->crt_ablkcipher.reqsize =
 273                sizeof(struct cryptd_blkcipher_request_ctx);
 274        return 0;
 275}
 276
 277static void cryptd_blkcipher_exit_tfm(struct crypto_tfm *tfm)
 278{
 279        struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
 280
 281        crypto_free_blkcipher(ctx->child);
 282}
 283
 284static void *cryptd_alloc_instance(struct crypto_alg *alg, unsigned int head,
 285                                   unsigned int tail)
 286{
 287        char *p;
 288        struct crypto_instance *inst;
 289        int err;
 290
 291        p = kzalloc(head + sizeof(*inst) + tail, GFP_KERNEL);
 292        if (!p)
 293                return ERR_PTR(-ENOMEM);
 294
 295        inst = (void *)(p + head);
 296
 297        err = -ENAMETOOLONG;
 298        if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 299                     "cryptd(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
 300                goto out_free_inst;
 301
 302        memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
 303
 304        inst->alg.cra_priority = alg->cra_priority + 50;
 305        inst->alg.cra_blocksize = alg->cra_blocksize;
 306        inst->alg.cra_alignmask = alg->cra_alignmask;
 307
 308out:
 309        return p;
 310
 311out_free_inst:
 312        kfree(p);
 313        p = ERR_PTR(err);
 314        goto out;
 315}
 316
 317static int cryptd_create_blkcipher(struct crypto_template *tmpl,
 318                                   struct rtattr **tb,
 319                                   struct cryptd_queue *queue)
 320{
 321        struct cryptd_instance_ctx *ctx;
 322        struct crypto_instance *inst;
 323        struct crypto_alg *alg;
 324        int err;
 325
 326        alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER,
 327                                  CRYPTO_ALG_TYPE_MASK);
 328        if (IS_ERR(alg))
 329                return PTR_ERR(alg);
 330
 331        inst = cryptd_alloc_instance(alg, 0, sizeof(*ctx));
 332        err = PTR_ERR(inst);
 333        if (IS_ERR(inst))
 334                goto out_put_alg;
 335
 336        ctx = crypto_instance_ctx(inst);
 337        ctx->queue = queue;
 338
 339        err = crypto_init_spawn(&ctx->spawn, alg, inst,
 340                                CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 341        if (err)
 342                goto out_free_inst;
 343
 344        inst->alg.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC;
 345        inst->alg.cra_type = &crypto_ablkcipher_type;
 346
 347        inst->alg.cra_ablkcipher.ivsize = alg->cra_blkcipher.ivsize;
 348        inst->alg.cra_ablkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
 349        inst->alg.cra_ablkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
 350
 351        inst->alg.cra_ablkcipher.geniv = alg->cra_blkcipher.geniv;
 352
 353        inst->alg.cra_ctxsize = sizeof(struct cryptd_blkcipher_ctx);
 354
 355        inst->alg.cra_init = cryptd_blkcipher_init_tfm;
 356        inst->alg.cra_exit = cryptd_blkcipher_exit_tfm;
 357
 358        inst->alg.cra_ablkcipher.setkey = cryptd_blkcipher_setkey;
 359        inst->alg.cra_ablkcipher.encrypt = cryptd_blkcipher_encrypt_enqueue;
 360        inst->alg.cra_ablkcipher.decrypt = cryptd_blkcipher_decrypt_enqueue;
 361
 362        err = crypto_register_instance(tmpl, inst);
 363        if (err) {
 364                crypto_drop_spawn(&ctx->spawn);
 365out_free_inst:
 366                kfree(inst);
 367        }
 368
 369out_put_alg:
 370        crypto_mod_put(alg);
 371        return err;
 372}
 373
 374static int cryptd_hash_init_tfm(struct crypto_tfm *tfm)
 375{
 376        struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 377        struct hashd_instance_ctx *ictx = crypto_instance_ctx(inst);
 378        struct crypto_shash_spawn *spawn = &ictx->spawn;
 379        struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 380        struct crypto_shash *hash;
 381
 382        hash = crypto_spawn_shash(spawn);
 383        if (IS_ERR(hash))
 384                return PTR_ERR(hash);
 385
 386        ctx->child = hash;
 387        crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
 388                                 sizeof(struct cryptd_hash_request_ctx) +
 389                                 crypto_shash_descsize(hash));
 390        return 0;
 391}
 392
 393static void cryptd_hash_exit_tfm(struct crypto_tfm *tfm)
 394{
 395        struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
 396
 397        crypto_free_shash(ctx->child);
 398}
 399
 400static int cryptd_hash_setkey(struct crypto_ahash *parent,
 401                                   const u8 *key, unsigned int keylen)
 402{
 403        struct cryptd_hash_ctx *ctx   = crypto_ahash_ctx(parent);
 404        struct crypto_shash *child = ctx->child;
 405        int err;
 406
 407        crypto_shash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 408        crypto_shash_set_flags(child, crypto_ahash_get_flags(parent) &
 409                                      CRYPTO_TFM_REQ_MASK);
 410        err = crypto_shash_setkey(child, key, keylen);
 411        crypto_ahash_set_flags(parent, crypto_shash_get_flags(child) &
 412                                       CRYPTO_TFM_RES_MASK);
 413        return err;
 414}
 415
 416static int cryptd_hash_enqueue(struct ahash_request *req,
 417                                crypto_completion_t complete)
 418{
 419        struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 420        struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 421        struct cryptd_queue *queue =
 422                cryptd_get_queue(crypto_ahash_tfm(tfm));
 423
 424        rctx->complete = req->base.complete;
 425        req->base.complete = complete;
 426
 427        return cryptd_enqueue_request(queue, &req->base);
 428}
 429
 430static void cryptd_hash_init(struct crypto_async_request *req_async, int err)
 431{
 432        struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 433        struct crypto_shash *child = ctx->child;
 434        struct ahash_request *req = ahash_request_cast(req_async);
 435        struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 436        struct shash_desc *desc = &rctx->desc;
 437
 438        if (unlikely(err == -EINPROGRESS))
 439                goto out;
 440
 441        desc->tfm = child;
 442        desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 443
 444        err = crypto_shash_init(desc);
 445
 446        req->base.complete = rctx->complete;
 447
 448out:
 449        local_bh_disable();
 450        rctx->complete(&req->base, err);
 451        local_bh_enable();
 452}
 453
 454static int cryptd_hash_init_enqueue(struct ahash_request *req)
 455{
 456        return cryptd_hash_enqueue(req, cryptd_hash_init);
 457}
 458
 459static void cryptd_hash_update(struct crypto_async_request *req_async, int err)
 460{
 461        struct ahash_request *req = ahash_request_cast(req_async);
 462        struct cryptd_hash_request_ctx *rctx;
 463
 464        rctx = ahash_request_ctx(req);
 465
 466        if (unlikely(err == -EINPROGRESS))
 467                goto out;
 468
 469        err = shash_ahash_update(req, &rctx->desc);
 470
 471        req->base.complete = rctx->complete;
 472
 473out:
 474        local_bh_disable();
 475        rctx->complete(&req->base, err);
 476        local_bh_enable();
 477}
 478
 479static int cryptd_hash_update_enqueue(struct ahash_request *req)
 480{
 481        return cryptd_hash_enqueue(req, cryptd_hash_update);
 482}
 483
 484static void cryptd_hash_final(struct crypto_async_request *req_async, int err)
 485{
 486        struct ahash_request *req = ahash_request_cast(req_async);
 487        struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 488
 489        if (unlikely(err == -EINPROGRESS))
 490                goto out;
 491
 492        err = crypto_shash_final(&rctx->desc, req->result);
 493
 494        req->base.complete = rctx->complete;
 495
 496out:
 497        local_bh_disable();
 498        rctx->complete(&req->base, err);
 499        local_bh_enable();
 500}
 501
 502static int cryptd_hash_final_enqueue(struct ahash_request *req)
 503{
 504        return cryptd_hash_enqueue(req, cryptd_hash_final);
 505}
 506
 507static void cryptd_hash_finup(struct crypto_async_request *req_async, int err)
 508{
 509        struct ahash_request *req = ahash_request_cast(req_async);
 510        struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 511
 512        if (unlikely(err == -EINPROGRESS))
 513                goto out;
 514
 515        err = shash_ahash_finup(req, &rctx->desc);
 516
 517        req->base.complete = rctx->complete;
 518
 519out:
 520        local_bh_disable();
 521        rctx->complete(&req->base, err);
 522        local_bh_enable();
 523}
 524
 525static int cryptd_hash_finup_enqueue(struct ahash_request *req)
 526{
 527        return cryptd_hash_enqueue(req, cryptd_hash_finup);
 528}
 529
 530static void cryptd_hash_digest(struct crypto_async_request *req_async, int err)
 531{
 532        struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
 533        struct crypto_shash *child = ctx->child;
 534        struct ahash_request *req = ahash_request_cast(req_async);
 535        struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 536        struct shash_desc *desc = &rctx->desc;
 537
 538        if (unlikely(err == -EINPROGRESS))
 539                goto out;
 540
 541        desc->tfm = child;
 542        desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 543
 544        err = shash_ahash_digest(req, desc);
 545
 546        req->base.complete = rctx->complete;
 547
 548out:
 549        local_bh_disable();
 550        rctx->complete(&req->base, err);
 551        local_bh_enable();
 552}
 553
 554static int cryptd_hash_digest_enqueue(struct ahash_request *req)
 555{
 556        return cryptd_hash_enqueue(req, cryptd_hash_digest);
 557}
 558
 559static int cryptd_hash_export(struct ahash_request *req, void *out)
 560{
 561        struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 562
 563        return crypto_shash_export(&rctx->desc, out);
 564}
 565
 566static int cryptd_hash_import(struct ahash_request *req, const void *in)
 567{
 568        struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 569
 570        return crypto_shash_import(&rctx->desc, in);
 571}
 572
 573static int cryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,
 574                              struct cryptd_queue *queue)
 575{
 576        struct hashd_instance_ctx *ctx;
 577        struct ahash_instance *inst;
 578        struct shash_alg *salg;
 579        struct crypto_alg *alg;
 580        int err;
 581
 582        salg = shash_attr_alg(tb[1], 0, 0);
 583        if (IS_ERR(salg))
 584                return PTR_ERR(salg);
 585
 586        alg = &salg->base;
 587        inst = cryptd_alloc_instance(alg, ahash_instance_headroom(),
 588                                     sizeof(*ctx));
 589        err = PTR_ERR(inst);
 590        if (IS_ERR(inst))
 591                goto out_put_alg;
 592
 593        ctx = ahash_instance_ctx(inst);
 594        ctx->queue = queue;
 595
 596        err = crypto_init_shash_spawn(&ctx->spawn, salg,
 597                                      ahash_crypto_instance(inst));
 598        if (err)
 599                goto out_free_inst;
 600
 601        inst->alg.halg.base.cra_flags = CRYPTO_ALG_ASYNC;
 602
 603        inst->alg.halg.digestsize = salg->digestsize;
 604        inst->alg.halg.base.cra_ctxsize = sizeof(struct cryptd_hash_ctx);
 605
 606        inst->alg.halg.base.cra_init = cryptd_hash_init_tfm;
 607        inst->alg.halg.base.cra_exit = cryptd_hash_exit_tfm;
 608
 609        inst->alg.init   = cryptd_hash_init_enqueue;
 610        inst->alg.update = cryptd_hash_update_enqueue;
 611        inst->alg.final  = cryptd_hash_final_enqueue;
 612        inst->alg.finup  = cryptd_hash_finup_enqueue;
 613        inst->alg.export = cryptd_hash_export;
 614        inst->alg.import = cryptd_hash_import;
 615        inst->alg.setkey = cryptd_hash_setkey;
 616        inst->alg.digest = cryptd_hash_digest_enqueue;
 617
 618        err = ahash_register_instance(tmpl, inst);
 619        if (err) {
 620                crypto_drop_shash(&ctx->spawn);
 621out_free_inst:
 622                kfree(inst);
 623        }
 624
 625out_put_alg:
 626        crypto_mod_put(alg);
 627        return err;
 628}
 629
 630static void cryptd_aead_crypt(struct aead_request *req,
 631                        struct crypto_aead *child,
 632                        int err,
 633                        int (*crypt)(struct aead_request *req))
 634{
 635        struct cryptd_aead_request_ctx *rctx;
 636        rctx = aead_request_ctx(req);
 637
 638        if (unlikely(err == -EINPROGRESS))
 639                goto out;
 640        aead_request_set_tfm(req, child);
 641        err = crypt( req );
 642        req->base.complete = rctx->complete;
 643out:
 644        local_bh_disable();
 645        rctx->complete(&req->base, err);
 646        local_bh_enable();
 647}
 648
 649static void cryptd_aead_encrypt(struct crypto_async_request *areq, int err)
 650{
 651        struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm);
 652        struct crypto_aead *child = ctx->child;
 653        struct aead_request *req;
 654
 655        req = container_of(areq, struct aead_request, base);
 656        cryptd_aead_crypt(req, child, err, crypto_aead_crt(child)->encrypt);
 657}
 658
 659static void cryptd_aead_decrypt(struct crypto_async_request *areq, int err)
 660{
 661        struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm);
 662        struct crypto_aead *child = ctx->child;
 663        struct aead_request *req;
 664
 665        req = container_of(areq, struct aead_request, base);
 666        cryptd_aead_crypt(req, child, err, crypto_aead_crt(child)->decrypt);
 667}
 668
 669static int cryptd_aead_enqueue(struct aead_request *req,
 670                                    crypto_completion_t complete)
 671{
 672        struct cryptd_aead_request_ctx *rctx = aead_request_ctx(req);
 673        struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 674        struct cryptd_queue *queue = cryptd_get_queue(crypto_aead_tfm(tfm));
 675
 676        rctx->complete = req->base.complete;
 677        req->base.complete = complete;
 678        return cryptd_enqueue_request(queue, &req->base);
 679}
 680
 681static int cryptd_aead_encrypt_enqueue(struct aead_request *req)
 682{
 683        return cryptd_aead_enqueue(req, cryptd_aead_encrypt );
 684}
 685
 686static int cryptd_aead_decrypt_enqueue(struct aead_request *req)
 687{
 688        return cryptd_aead_enqueue(req, cryptd_aead_decrypt );
 689}
 690
 691static int cryptd_aead_init_tfm(struct crypto_tfm *tfm)
 692{
 693        struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
 694        struct aead_instance_ctx *ictx = crypto_instance_ctx(inst);
 695        struct crypto_aead_spawn *spawn = &ictx->aead_spawn;
 696        struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(tfm);
 697        struct crypto_aead *cipher;
 698
 699        cipher = crypto_spawn_aead(spawn);
 700        if (IS_ERR(cipher))
 701                return PTR_ERR(cipher);
 702
 703        crypto_aead_set_flags(cipher, CRYPTO_TFM_REQ_MAY_SLEEP);
 704        ctx->child = cipher;
 705        tfm->crt_aead.reqsize = sizeof(struct cryptd_aead_request_ctx);
 706        return 0;
 707}
 708
 709static void cryptd_aead_exit_tfm(struct crypto_tfm *tfm)
 710{
 711        struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(tfm);
 712        crypto_free_aead(ctx->child);
 713}
 714
 715static int cryptd_create_aead(struct crypto_template *tmpl,
 716                              struct rtattr **tb,
 717                              struct cryptd_queue *queue)
 718{
 719        struct aead_instance_ctx *ctx;
 720        struct crypto_instance *inst;
 721        struct crypto_alg *alg;
 722        int err;
 723
 724        alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_AEAD,
 725                                CRYPTO_ALG_TYPE_MASK);
 726        if (IS_ERR(alg))
 727                return PTR_ERR(alg);
 728
 729        inst = cryptd_alloc_instance(alg, 0, sizeof(*ctx));
 730        err = PTR_ERR(inst);
 731        if (IS_ERR(inst))
 732                goto out_put_alg;
 733
 734        ctx = crypto_instance_ctx(inst);
 735        ctx->queue = queue;
 736
 737        err = crypto_init_spawn(&ctx->aead_spawn.base, alg, inst,
 738                        CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
 739        if (err)
 740                goto out_free_inst;
 741
 742        inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC;
 743        inst->alg.cra_type = alg->cra_type;
 744        inst->alg.cra_ctxsize = sizeof(struct cryptd_aead_ctx);
 745        inst->alg.cra_init = cryptd_aead_init_tfm;
 746        inst->alg.cra_exit = cryptd_aead_exit_tfm;
 747        inst->alg.cra_aead.setkey      = alg->cra_aead.setkey;
 748        inst->alg.cra_aead.setauthsize = alg->cra_aead.setauthsize;
 749        inst->alg.cra_aead.geniv       = alg->cra_aead.geniv;
 750        inst->alg.cra_aead.ivsize      = alg->cra_aead.ivsize;
 751        inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize;
 752        inst->alg.cra_aead.encrypt     = cryptd_aead_encrypt_enqueue;
 753        inst->alg.cra_aead.decrypt     = cryptd_aead_decrypt_enqueue;
 754        inst->alg.cra_aead.givencrypt  = alg->cra_aead.givencrypt;
 755        inst->alg.cra_aead.givdecrypt  = alg->cra_aead.givdecrypt;
 756
 757        err = crypto_register_instance(tmpl, inst);
 758        if (err) {
 759                crypto_drop_spawn(&ctx->aead_spawn.base);
 760out_free_inst:
 761                kfree(inst);
 762        }
 763out_put_alg:
 764        crypto_mod_put(alg);
 765        return err;
 766}
 767
 768static struct cryptd_queue queue;
 769
 770static int cryptd_create(struct crypto_template *tmpl, struct rtattr **tb)
 771{
 772        struct crypto_attr_type *algt;
 773
 774        algt = crypto_get_attr_type(tb);
 775        if (IS_ERR(algt))
 776                return PTR_ERR(algt);
 777
 778        switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
 779        case CRYPTO_ALG_TYPE_BLKCIPHER:
 780                return cryptd_create_blkcipher(tmpl, tb, &queue);
 781        case CRYPTO_ALG_TYPE_DIGEST:
 782                return cryptd_create_hash(tmpl, tb, &queue);
 783        case CRYPTO_ALG_TYPE_AEAD:
 784                return cryptd_create_aead(tmpl, tb, &queue);
 785        }
 786
 787        return -EINVAL;
 788}
 789
 790static void cryptd_free(struct crypto_instance *inst)
 791{
 792        struct cryptd_instance_ctx *ctx = crypto_instance_ctx(inst);
 793        struct hashd_instance_ctx *hctx = crypto_instance_ctx(inst);
 794        struct aead_instance_ctx *aead_ctx = crypto_instance_ctx(inst);
 795
 796        switch (inst->alg.cra_flags & CRYPTO_ALG_TYPE_MASK) {
 797        case CRYPTO_ALG_TYPE_AHASH:
 798                crypto_drop_shash(&hctx->spawn);
 799                kfree(ahash_instance(inst));
 800                return;
 801        case CRYPTO_ALG_TYPE_AEAD:
 802                crypto_drop_spawn(&aead_ctx->aead_spawn.base);
 803                kfree(inst);
 804                return;
 805        default:
 806                crypto_drop_spawn(&ctx->spawn);
 807                kfree(inst);
 808        }
 809}
 810
 811static struct crypto_template cryptd_tmpl = {
 812        .name = "cryptd",
 813        .create = cryptd_create,
 814        .free = cryptd_free,
 815        .module = THIS_MODULE,
 816};
 817
 818struct cryptd_ablkcipher *cryptd_alloc_ablkcipher(const char *alg_name,
 819                                                  u32 type, u32 mask)
 820{
 821        char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 822        struct crypto_tfm *tfm;
 823
 824        if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 825                     "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 826                return ERR_PTR(-EINVAL);
 827        type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
 828        type |= CRYPTO_ALG_TYPE_BLKCIPHER;
 829        mask &= ~CRYPTO_ALG_TYPE_MASK;
 830        mask |= (CRYPTO_ALG_GENIV | CRYPTO_ALG_TYPE_BLKCIPHER_MASK);
 831        tfm = crypto_alloc_base(cryptd_alg_name, type, mask);
 832        if (IS_ERR(tfm))
 833                return ERR_CAST(tfm);
 834        if (tfm->__crt_alg->cra_module != THIS_MODULE) {
 835                crypto_free_tfm(tfm);
 836                return ERR_PTR(-EINVAL);
 837        }
 838
 839        return __cryptd_ablkcipher_cast(__crypto_ablkcipher_cast(tfm));
 840}
 841EXPORT_SYMBOL_GPL(cryptd_alloc_ablkcipher);
 842
 843struct crypto_blkcipher *cryptd_ablkcipher_child(struct cryptd_ablkcipher *tfm)
 844{
 845        struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(&tfm->base);
 846        return ctx->child;
 847}
 848EXPORT_SYMBOL_GPL(cryptd_ablkcipher_child);
 849
 850void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm)
 851{
 852        crypto_free_ablkcipher(&tfm->base);
 853}
 854EXPORT_SYMBOL_GPL(cryptd_free_ablkcipher);
 855
 856struct cryptd_ahash *cryptd_alloc_ahash(const char *alg_name,
 857                                        u32 type, u32 mask)
 858{
 859        char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 860        struct crypto_ahash *tfm;
 861
 862        if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 863                     "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 864                return ERR_PTR(-EINVAL);
 865        tfm = crypto_alloc_ahash(cryptd_alg_name, type, mask);
 866        if (IS_ERR(tfm))
 867                return ERR_CAST(tfm);
 868        if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
 869                crypto_free_ahash(tfm);
 870                return ERR_PTR(-EINVAL);
 871        }
 872
 873        return __cryptd_ahash_cast(tfm);
 874}
 875EXPORT_SYMBOL_GPL(cryptd_alloc_ahash);
 876
 877struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm)
 878{
 879        struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
 880
 881        return ctx->child;
 882}
 883EXPORT_SYMBOL_GPL(cryptd_ahash_child);
 884
 885struct shash_desc *cryptd_shash_desc(struct ahash_request *req)
 886{
 887        struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
 888        return &rctx->desc;
 889}
 890EXPORT_SYMBOL_GPL(cryptd_shash_desc);
 891
 892void cryptd_free_ahash(struct cryptd_ahash *tfm)
 893{
 894        crypto_free_ahash(&tfm->base);
 895}
 896EXPORT_SYMBOL_GPL(cryptd_free_ahash);
 897
 898struct cryptd_aead *cryptd_alloc_aead(const char *alg_name,
 899                                                  u32 type, u32 mask)
 900{
 901        char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
 902        struct crypto_aead *tfm;
 903
 904        if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
 905                     "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
 906                return ERR_PTR(-EINVAL);
 907        tfm = crypto_alloc_aead(cryptd_alg_name, type, mask);
 908        if (IS_ERR(tfm))
 909                return ERR_CAST(tfm);
 910        if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
 911                crypto_free_aead(tfm);
 912                return ERR_PTR(-EINVAL);
 913        }
 914        return __cryptd_aead_cast(tfm);
 915}
 916EXPORT_SYMBOL_GPL(cryptd_alloc_aead);
 917
 918struct crypto_aead *cryptd_aead_child(struct cryptd_aead *tfm)
 919{
 920        struct cryptd_aead_ctx *ctx;
 921        ctx = crypto_aead_ctx(&tfm->base);
 922        return ctx->child;
 923}
 924EXPORT_SYMBOL_GPL(cryptd_aead_child);
 925
 926void cryptd_free_aead(struct cryptd_aead *tfm)
 927{
 928        crypto_free_aead(&tfm->base);
 929}
 930EXPORT_SYMBOL_GPL(cryptd_free_aead);
 931
 932static int __init cryptd_init(void)
 933{
 934        int err;
 935
 936        err = cryptd_init_queue(&queue, CRYPTD_MAX_CPU_QLEN);
 937        if (err)
 938                return err;
 939
 940        err = crypto_register_template(&cryptd_tmpl);
 941        if (err)
 942                cryptd_fini_queue(&queue);
 943
 944        return err;
 945}
 946
 947static void __exit cryptd_exit(void)
 948{
 949        cryptd_fini_queue(&queue);
 950        crypto_unregister_template(&cryptd_tmpl);
 951}
 952
 953subsys_initcall(cryptd_init);
 954module_exit(cryptd_exit);
 955
 956MODULE_LICENSE("GPL");
 957MODULE_DESCRIPTION("Software async crypto daemon");
 958
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