Merge branch 'for-4.3/microsoft' into for-linus

[mirror_ubuntu-artful-kernel.git] / crypto / cryptd.c

/*
 * Software async crypto daemon.
 *
 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * Added AEAD support to cryptd.
 *    Authors: Tadeusz Struk (tadeusz.struk@intel.com)
 *             Adrian Hoban <adrian.hoban@intel.com>
 *             Gabriele Paoloni <gabriele.paoloni@intel.com>
 *             Aidan O'Mahony (aidan.o.mahony@intel.com)
 *    Copyright (c) 2010, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 */

#include <crypto/algapi.h>
#include <crypto/internal/hash.h>
#include <crypto/internal/aead.h>
#include <crypto/cryptd.h>
#include <crypto/crypto_wq.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/scatterlist.h>
#include <linux/sched.h>
#include <linux/slab.h>

#define CRYPTD_MAX_CPU_QLEN 100

struct cryptd_cpu_queue {
        struct crypto_queue queue;
        struct work_struct work;
};

struct cryptd_queue {
        struct cryptd_cpu_queue __percpu *cpu_queue;
};

struct cryptd_instance_ctx {
        struct crypto_spawn spawn;
        struct cryptd_queue *queue;
};

struct hashd_instance_ctx {
        struct crypto_shash_spawn spawn;
        struct cryptd_queue *queue;
};

struct aead_instance_ctx {
        struct crypto_aead_spawn aead_spawn;
        struct cryptd_queue *queue;
};

struct cryptd_blkcipher_ctx {
        struct crypto_blkcipher *child;
};

struct cryptd_blkcipher_request_ctx {
        crypto_completion_t complete;
};

struct cryptd_hash_ctx {
        struct crypto_shash *child;
};

struct cryptd_hash_request_ctx {
        crypto_completion_t complete;
        struct shash_desc desc;
};

struct cryptd_aead_ctx {
        struct crypto_aead *child;
};

struct cryptd_aead_request_ctx {
        crypto_completion_t complete;
};

static void cryptd_queue_worker(struct work_struct *work);

static int cryptd_init_queue(struct cryptd_queue *queue,
                             unsigned int max_cpu_qlen)
{
        int cpu;
        struct cryptd_cpu_queue *cpu_queue;

        queue->cpu_queue = alloc_percpu(struct cryptd_cpu_queue);
        if (!queue->cpu_queue)
                return -ENOMEM;
        for_each_possible_cpu(cpu) {
                cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
                crypto_init_queue(&cpu_queue->queue, max_cpu_qlen);
                INIT_WORK(&cpu_queue->work, cryptd_queue_worker);
        }
        return 0;
}

static void cryptd_fini_queue(struct cryptd_queue *queue)
{
        int cpu;
        struct cryptd_cpu_queue *cpu_queue;

        for_each_possible_cpu(cpu) {
                cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
                BUG_ON(cpu_queue->queue.qlen);
        }
        free_percpu(queue->cpu_queue);
}

static int cryptd_enqueue_request(struct cryptd_queue *queue,
                                  struct crypto_async_request *request)
{
        int cpu, err;
        struct cryptd_cpu_queue *cpu_queue;

        cpu = get_cpu();
        cpu_queue = this_cpu_ptr(queue->cpu_queue);
        err = crypto_enqueue_request(&cpu_queue->queue, request);
        queue_work_on(cpu, kcrypto_wq, &cpu_queue->work);
        put_cpu();

        return err;
}

/* Called in workqueue context, do one real cryption work (via
 * req->complete) and reschedule itself if there are more work to
 * do. */
static void cryptd_queue_worker(struct work_struct *work)
{
        struct cryptd_cpu_queue *cpu_queue;
        struct crypto_async_request *req, *backlog;

        cpu_queue = container_of(work, struct cryptd_cpu_queue, work);
        /*
         * Only handle one request at a time to avoid hogging crypto workqueue.
         * preempt_disable/enable is used to prevent being preempted by
         * cryptd_enqueue_request(). local_bh_disable/enable is used to prevent
         * cryptd_enqueue_request() being accessed from software interrupts.
         */
        local_bh_disable();
        preempt_disable();
        backlog = crypto_get_backlog(&cpu_queue->queue);
        req = crypto_dequeue_request(&cpu_queue->queue);
        preempt_enable();
        local_bh_enable();

        if (!req)
                return;

        if (backlog)
                backlog->complete(backlog, -EINPROGRESS);
        req->complete(req, 0);

        if (cpu_queue->queue.qlen)
                queue_work(kcrypto_wq, &cpu_queue->work);
}

static inline struct cryptd_queue *cryptd_get_queue(struct crypto_tfm *tfm)
{
        struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
        struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
        return ictx->queue;
}

static inline void cryptd_check_internal(struct rtattr **tb, u32 *type,
                                         u32 *mask)
{
        struct crypto_attr_type *algt;

        algt = crypto_get_attr_type(tb);
        if (IS_ERR(algt))
                return;
        if ((algt->type & CRYPTO_ALG_INTERNAL))
                *type |= CRYPTO_ALG_INTERNAL;
        if ((algt->mask & CRYPTO_ALG_INTERNAL))
                *mask |= CRYPTO_ALG_INTERNAL;
}

static int cryptd_blkcipher_setkey(struct crypto_ablkcipher *parent,
                                   const u8 *key, unsigned int keylen)
{
        struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(parent);
        struct crypto_blkcipher *child = ctx->child;
        int err;

        crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
        crypto_blkcipher_set_flags(child, crypto_ablkcipher_get_flags(parent) &
                                          CRYPTO_TFM_REQ_MASK);
        err = crypto_blkcipher_setkey(child, key, keylen);
        crypto_ablkcipher_set_flags(parent, crypto_blkcipher_get_flags(child) &
                                            CRYPTO_TFM_RES_MASK);
        return err;
}

static void cryptd_blkcipher_crypt(struct ablkcipher_request *req,
                                   struct crypto_blkcipher *child,
                                   int err,
                                   int (*crypt)(struct blkcipher_desc *desc,
                                                struct scatterlist *dst,
                                                struct scatterlist *src,
                                                unsigned int len))
{
        struct cryptd_blkcipher_request_ctx *rctx;
        struct blkcipher_desc desc;

        rctx = ablkcipher_request_ctx(req);

        if (unlikely(err == -EINPROGRESS))
                goto out;

        desc.tfm = child;
        desc.info = req->info;
        desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;

        err = crypt(&desc, req->dst, req->src, req->nbytes);

        req->base.complete = rctx->complete;

out:
        local_bh_disable();
        rctx->complete(&req->base, err);
        local_bh_enable();
}

static void cryptd_blkcipher_encrypt(struct crypto_async_request *req, int err)
{
        struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
        struct crypto_blkcipher *child = ctx->child;

        cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
                               crypto_blkcipher_crt(child)->encrypt);
}

static void cryptd_blkcipher_decrypt(struct crypto_async_request *req, int err)
{
        struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
        struct crypto_blkcipher *child = ctx->child;

        cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
                               crypto_blkcipher_crt(child)->decrypt);
}

static int cryptd_blkcipher_enqueue(struct ablkcipher_request *req,
                                    crypto_completion_t compl)
{
        struct cryptd_blkcipher_request_ctx *rctx = ablkcipher_request_ctx(req);
        struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
        struct cryptd_queue *queue;

        queue = cryptd_get_queue(crypto_ablkcipher_tfm(tfm));
        rctx->complete = req->base.complete;
        req->base.complete = compl;

        return cryptd_enqueue_request(queue, &req->base);
}

static int cryptd_blkcipher_encrypt_enqueue(struct ablkcipher_request *req)
{
        return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_encrypt);
}

static int cryptd_blkcipher_decrypt_enqueue(struct ablkcipher_request *req)
{
        return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_decrypt);
}

static int cryptd_blkcipher_init_tfm(struct crypto_tfm *tfm)
{
        struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
        struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
        struct crypto_spawn *spawn = &ictx->spawn;
        struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
        struct crypto_blkcipher *cipher;

        cipher = crypto_spawn_blkcipher(spawn);
        if (IS_ERR(cipher))
                return PTR_ERR(cipher);

        ctx->child = cipher;
        tfm->crt_ablkcipher.reqsize =
                sizeof(struct cryptd_blkcipher_request_ctx);
        return 0;
}

static void cryptd_blkcipher_exit_tfm(struct crypto_tfm *tfm)
{
        struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);

        crypto_free_blkcipher(ctx->child);
}

static int cryptd_init_instance(struct crypto_instance *inst,
                                struct crypto_alg *alg)
{
        if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
                     "cryptd(%s)",
                     alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
                return -ENAMETOOLONG;

        memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);

        inst->alg.cra_priority = alg->cra_priority + 50;
        inst->alg.cra_blocksize = alg->cra_blocksize;
        inst->alg.cra_alignmask = alg->cra_alignmask;

        return 0;
}

static void *cryptd_alloc_instance(struct crypto_alg *alg, unsigned int head,
                                   unsigned int tail)
{
        char *p;
        struct crypto_instance *inst;
        int err;

        p = kzalloc(head + sizeof(*inst) + tail, GFP_KERNEL);
        if (!p)
                return ERR_PTR(-ENOMEM);

        inst = (void *)(p + head);

        err = cryptd_init_instance(inst, alg);
        if (err)
                goto out_free_inst;

out:
        return p;

out_free_inst:
        kfree(p);
        p = ERR_PTR(err);
        goto out;
}

static int cryptd_create_blkcipher(struct crypto_template *tmpl,
                                   struct rtattr **tb,
                                   struct cryptd_queue *queue)
{
        struct cryptd_instance_ctx *ctx;
        struct crypto_instance *inst;
        struct crypto_alg *alg;
        u32 type = CRYPTO_ALG_TYPE_BLKCIPHER;
        u32 mask = CRYPTO_ALG_TYPE_MASK;
        int err;

        cryptd_check_internal(tb, &type, &mask);

        alg = crypto_get_attr_alg(tb, type, mask);
        if (IS_ERR(alg))
                return PTR_ERR(alg);

        inst = cryptd_alloc_instance(alg, 0, sizeof(*ctx));
        err = PTR_ERR(inst);
        if (IS_ERR(inst))
                goto out_put_alg;

        ctx = crypto_instance_ctx(inst);
        ctx->queue = queue;

        err = crypto_init_spawn(&ctx->spawn, alg, inst,
                                CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
        if (err)
                goto out_free_inst;

        type = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC;
        if (alg->cra_flags & CRYPTO_ALG_INTERNAL)
                type |= CRYPTO_ALG_INTERNAL;
        inst->alg.cra_flags = type;
        inst->alg.cra_type = &crypto_ablkcipher_type;

        inst->alg.cra_ablkcipher.ivsize = alg->cra_blkcipher.ivsize;
        inst->alg.cra_ablkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
        inst->alg.cra_ablkcipher.max_keysize = alg->cra_blkcipher.max_keysize;

        inst->alg.cra_ablkcipher.geniv = alg->cra_blkcipher.geniv;

        inst->alg.cra_ctxsize = sizeof(struct cryptd_blkcipher_ctx);

        inst->alg.cra_init = cryptd_blkcipher_init_tfm;
        inst->alg.cra_exit = cryptd_blkcipher_exit_tfm;

        inst->alg.cra_ablkcipher.setkey = cryptd_blkcipher_setkey;
        inst->alg.cra_ablkcipher.encrypt = cryptd_blkcipher_encrypt_enqueue;
        inst->alg.cra_ablkcipher.decrypt = cryptd_blkcipher_decrypt_enqueue;

        err = crypto_register_instance(tmpl, inst);
        if (err) {
                crypto_drop_spawn(&ctx->spawn);
out_free_inst:
                kfree(inst);
        }

out_put_alg:
        crypto_mod_put(alg);
        return err;
}

static int cryptd_hash_init_tfm(struct crypto_tfm *tfm)
{
        struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
        struct hashd_instance_ctx *ictx = crypto_instance_ctx(inst);
        struct crypto_shash_spawn *spawn = &ictx->spawn;
        struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
        struct crypto_shash *hash;

        hash = crypto_spawn_shash(spawn);
        if (IS_ERR(hash))
                return PTR_ERR(hash);

        ctx->child = hash;
        crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
                                 sizeof(struct cryptd_hash_request_ctx) +
                                 crypto_shash_descsize(hash));
        return 0;
}

static void cryptd_hash_exit_tfm(struct crypto_tfm *tfm)
{
        struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);

        crypto_free_shash(ctx->child);
}

static int cryptd_hash_setkey(struct crypto_ahash *parent,
                                   const u8 *key, unsigned int keylen)
{
        struct cryptd_hash_ctx *ctx   = crypto_ahash_ctx(parent);
        struct crypto_shash *child = ctx->child;
        int err;

        crypto_shash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
        crypto_shash_set_flags(child, crypto_ahash_get_flags(parent) &
                                      CRYPTO_TFM_REQ_MASK);
        err = crypto_shash_setkey(child, key, keylen);
        crypto_ahash_set_flags(parent, crypto_shash_get_flags(child) &
                                       CRYPTO_TFM_RES_MASK);
        return err;
}

static int cryptd_hash_enqueue(struct ahash_request *req,
                                crypto_completion_t compl)
{
        struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
        struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
        struct cryptd_queue *queue =
                cryptd_get_queue(crypto_ahash_tfm(tfm));

        rctx->complete = req->base.complete;
        req->base.complete = compl;

        return cryptd_enqueue_request(queue, &req->base);
}

static void cryptd_hash_init(struct crypto_async_request *req_async, int err)
{
        struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
        struct crypto_shash *child = ctx->child;
        struct ahash_request *req = ahash_request_cast(req_async);
        struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
        struct shash_desc *desc = &rctx->desc;

        if (unlikely(err == -EINPROGRESS))
                goto out;

        desc->tfm = child;
        desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;

        err = crypto_shash_init(desc);

        req->base.complete = rctx->complete;

out:
        local_bh_disable();
        rctx->complete(&req->base, err);
        local_bh_enable();
}

static int cryptd_hash_init_enqueue(struct ahash_request *req)
{
        return cryptd_hash_enqueue(req, cryptd_hash_init);
}

static void cryptd_hash_update(struct crypto_async_request *req_async, int err)
{
        struct ahash_request *req = ahash_request_cast(req_async);
        struct cryptd_hash_request_ctx *rctx;

        rctx = ahash_request_ctx(req);

        if (unlikely(err == -EINPROGRESS))
                goto out;

        err = shash_ahash_update(req, &rctx->desc);

        req->base.complete = rctx->complete;

out:
        local_bh_disable();
        rctx->complete(&req->base, err);
        local_bh_enable();
}

static int cryptd_hash_update_enqueue(struct ahash_request *req)
{
        return cryptd_hash_enqueue(req, cryptd_hash_update);
}

static void cryptd_hash_final(struct crypto_async_request *req_async, int err)
{
        struct ahash_request *req = ahash_request_cast(req_async);
        struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);

        if (unlikely(err == -EINPROGRESS))
                goto out;

        err = crypto_shash_final(&rctx->desc, req->result);

        req->base.complete = rctx->complete;

out:
        local_bh_disable();
        rctx->complete(&req->base, err);
        local_bh_enable();
}

static int cryptd_hash_final_enqueue(struct ahash_request *req)
{
        return cryptd_hash_enqueue(req, cryptd_hash_final);
}

static void cryptd_hash_finup(struct crypto_async_request *req_async, int err)
{
        struct ahash_request *req = ahash_request_cast(req_async);
        struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);

        if (unlikely(err == -EINPROGRESS))
                goto out;

        err = shash_ahash_finup(req, &rctx->desc);

        req->base.complete = rctx->complete;

out:
        local_bh_disable();
        rctx->complete(&req->base, err);
        local_bh_enable();
}

static int cryptd_hash_finup_enqueue(struct ahash_request *req)
{
        return cryptd_hash_enqueue(req, cryptd_hash_finup);
}

static void cryptd_hash_digest(struct crypto_async_request *req_async, int err)
{
        struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
        struct crypto_shash *child = ctx->child;
        struct ahash_request *req = ahash_request_cast(req_async);
        struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
        struct shash_desc *desc = &rctx->desc;

        if (unlikely(err == -EINPROGRESS))
                goto out;

        desc->tfm = child;
        desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;

        err = shash_ahash_digest(req, desc);

        req->base.complete = rctx->complete;

out:
        local_bh_disable();
        rctx->complete(&req->base, err);
        local_bh_enable();
}

static int cryptd_hash_digest_enqueue(struct ahash_request *req)
{
        return cryptd_hash_enqueue(req, cryptd_hash_digest);
}

static int cryptd_hash_export(struct ahash_request *req, void *out)
{
        struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);

        return crypto_shash_export(&rctx->desc, out);
}

static int cryptd_hash_import(struct ahash_request *req, const void *in)
{
        struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);

        return crypto_shash_import(&rctx->desc, in);
}

static int cryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,
                              struct cryptd_queue *queue)
{
        struct hashd_instance_ctx *ctx;
        struct ahash_instance *inst;
        struct shash_alg *salg;
        struct crypto_alg *alg;
        u32 type = 0;
        u32 mask = 0;
        int err;

        cryptd_check_internal(tb, &type, &mask);

        salg = shash_attr_alg(tb[1], type, mask);
        if (IS_ERR(salg))
                return PTR_ERR(salg);

        alg = &salg->base;
        inst = cryptd_alloc_instance(alg, ahash_instance_headroom(),
                                     sizeof(*ctx));
        err = PTR_ERR(inst);
        if (IS_ERR(inst))
                goto out_put_alg;

        ctx = ahash_instance_ctx(inst);
        ctx->queue = queue;

        err = crypto_init_shash_spawn(&ctx->spawn, salg,
                                      ahash_crypto_instance(inst));
        if (err)
                goto out_free_inst;

        type = CRYPTO_ALG_ASYNC;
        if (alg->cra_flags & CRYPTO_ALG_INTERNAL)
                type |= CRYPTO_ALG_INTERNAL;
        inst->alg.halg.base.cra_flags = type;

        inst->alg.halg.digestsize = salg->digestsize;
        inst->alg.halg.base.cra_ctxsize = sizeof(struct cryptd_hash_ctx);

        inst->alg.halg.base.cra_init = cryptd_hash_init_tfm;
        inst->alg.halg.base.cra_exit = cryptd_hash_exit_tfm;

        inst->alg.init   = cryptd_hash_init_enqueue;
        inst->alg.update = cryptd_hash_update_enqueue;
        inst->alg.final  = cryptd_hash_final_enqueue;
        inst->alg.finup  = cryptd_hash_finup_enqueue;
        inst->alg.export = cryptd_hash_export;
        inst->alg.import = cryptd_hash_import;
        inst->alg.setkey = cryptd_hash_setkey;
        inst->alg.digest = cryptd_hash_digest_enqueue;

        err = ahash_register_instance(tmpl, inst);
        if (err) {
                crypto_drop_shash(&ctx->spawn);
out_free_inst:
                kfree(inst);
        }

out_put_alg:
        crypto_mod_put(alg);
        return err;
}

static int cryptd_aead_setkey(struct crypto_aead *parent,
                              const u8 *key, unsigned int keylen)
{
        struct cryptd_aead_ctx *ctx = crypto_aead_ctx(parent);
        struct crypto_aead *child = ctx->child;

        return crypto_aead_setkey(child, key, keylen);
}

static int cryptd_aead_setauthsize(struct crypto_aead *parent,
                                   unsigned int authsize)
{
        struct cryptd_aead_ctx *ctx = crypto_aead_ctx(parent);
        struct crypto_aead *child = ctx->child;

        return crypto_aead_setauthsize(child, authsize);
}

static void cryptd_aead_crypt(struct aead_request *req,
                        struct crypto_aead *child,
                        int err,
                        int (*crypt)(struct aead_request *req))
{
        struct cryptd_aead_request_ctx *rctx;
        rctx = aead_request_ctx(req);

        if (unlikely(err == -EINPROGRESS))
                goto out;
        aead_request_set_tfm(req, child);
        err = crypt( req );
        req->base.complete = rctx->complete;
out:
        local_bh_disable();
        rctx->complete(&req->base, err);
        local_bh_enable();
}

static void cryptd_aead_encrypt(struct crypto_async_request *areq, int err)
{
        struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm);
        struct crypto_aead *child = ctx->child;
        struct aead_request *req;

        req = container_of(areq, struct aead_request, base);
        cryptd_aead_crypt(req, child, err, crypto_aead_crt(child)->encrypt);
}

static void cryptd_aead_decrypt(struct crypto_async_request *areq, int err)
{
        struct cryptd_aead_ctx *ctx = crypto_tfm_ctx(areq->tfm);
        struct crypto_aead *child = ctx->child;
        struct aead_request *req;

        req = container_of(areq, struct aead_request, base);
        cryptd_aead_crypt(req, child, err, crypto_aead_crt(child)->decrypt);
}

static int cryptd_aead_enqueue(struct aead_request *req,
                                    crypto_completion_t compl)
{
        struct cryptd_aead_request_ctx *rctx = aead_request_ctx(req);
        struct crypto_aead *tfm = crypto_aead_reqtfm(req);
        struct cryptd_queue *queue = cryptd_get_queue(crypto_aead_tfm(tfm));

        rctx->complete = req->base.complete;
        req->base.complete = compl;
        return cryptd_enqueue_request(queue, &req->base);
}

static int cryptd_aead_encrypt_enqueue(struct aead_request *req)
{
        return cryptd_aead_enqueue(req, cryptd_aead_encrypt );
}

static int cryptd_aead_decrypt_enqueue(struct aead_request *req)
{
        return cryptd_aead_enqueue(req, cryptd_aead_decrypt );
}

static int cryptd_aead_init_tfm(struct crypto_aead *tfm)
{
        struct aead_instance *inst = aead_alg_instance(tfm);
        struct aead_instance_ctx *ictx = aead_instance_ctx(inst);
        struct crypto_aead_spawn *spawn = &ictx->aead_spawn;
        struct cryptd_aead_ctx *ctx = crypto_aead_ctx(tfm);
        struct crypto_aead *cipher;

        cipher = crypto_spawn_aead(spawn);
        if (IS_ERR(cipher))
                return PTR_ERR(cipher);

        ctx->child = cipher;
        crypto_aead_set_reqsize(tfm, sizeof(struct cryptd_aead_request_ctx));
        return 0;
}

static void cryptd_aead_exit_tfm(struct crypto_aead *tfm)
{
        struct cryptd_aead_ctx *ctx = crypto_aead_ctx(tfm);
        crypto_free_aead(ctx->child);
}

static int cryptd_create_aead(struct crypto_template *tmpl,
                              struct rtattr **tb,
                              struct cryptd_queue *queue)
{
        struct aead_instance_ctx *ctx;
        struct aead_instance *inst;
        struct aead_alg *alg;
        const char *name;
        u32 type = 0;
        u32 mask = 0;
        int err;

        cryptd_check_internal(tb, &type, &mask);

        name = crypto_attr_alg_name(tb[1]);
        if (IS_ERR(name))
                return PTR_ERR(name);

        inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
        if (!inst)
                return -ENOMEM;

        ctx = aead_instance_ctx(inst);
        ctx->queue = queue;

        crypto_set_aead_spawn(&ctx->aead_spawn, aead_crypto_instance(inst));
        err = crypto_grab_aead(&ctx->aead_spawn, name, type, mask);
        if (err)
                goto out_free_inst;

        alg = crypto_spawn_aead_alg(&ctx->aead_spawn);
        err = cryptd_init_instance(aead_crypto_instance(inst), &alg->base);
        if (err)
                goto out_drop_aead;

        inst->alg.base.cra_flags = CRYPTO_ALG_ASYNC |
                                   (alg->base.cra_flags & CRYPTO_ALG_INTERNAL);
        inst->alg.base.cra_ctxsize = sizeof(struct cryptd_aead_ctx);

        inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
        inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);

        inst->alg.init = cryptd_aead_init_tfm;
        inst->alg.exit = cryptd_aead_exit_tfm;
        inst->alg.setkey = cryptd_aead_setkey;
        inst->alg.setauthsize = cryptd_aead_setauthsize;
        inst->alg.encrypt = cryptd_aead_encrypt_enqueue;
        inst->alg.decrypt = cryptd_aead_decrypt_enqueue;

        err = aead_register_instance(tmpl, inst);
        if (err) {
out_drop_aead:
                crypto_drop_aead(&ctx->aead_spawn);
out_free_inst:
                kfree(inst);
        }
        return err;
}

static struct cryptd_queue queue;

static int cryptd_create(struct crypto_template *tmpl, struct rtattr **tb)
{
        struct crypto_attr_type *algt;

        algt = crypto_get_attr_type(tb);
        if (IS_ERR(algt))
                return PTR_ERR(algt);

        switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
        case CRYPTO_ALG_TYPE_BLKCIPHER:
                return cryptd_create_blkcipher(tmpl, tb, &queue);
        case CRYPTO_ALG_TYPE_DIGEST:
                return cryptd_create_hash(tmpl, tb, &queue);
        case CRYPTO_ALG_TYPE_AEAD:
                return cryptd_create_aead(tmpl, tb, &queue);
        }

        return -EINVAL;
}

static void cryptd_free(struct crypto_instance *inst)
{
        struct cryptd_instance_ctx *ctx = crypto_instance_ctx(inst);
        struct hashd_instance_ctx *hctx = crypto_instance_ctx(inst);
        struct aead_instance_ctx *aead_ctx = crypto_instance_ctx(inst);

        switch (inst->alg.cra_flags & CRYPTO_ALG_TYPE_MASK) {
        case CRYPTO_ALG_TYPE_AHASH:
                crypto_drop_shash(&hctx->spawn);
                kfree(ahash_instance(inst));
                return;
        case CRYPTO_ALG_TYPE_AEAD:
                crypto_drop_aead(&aead_ctx->aead_spawn);
                kfree(aead_instance(inst));
                return;
        default:
                crypto_drop_spawn(&ctx->spawn);
                kfree(inst);
        }
}

static struct crypto_template cryptd_tmpl = {
        .name = "cryptd",
        .create = cryptd_create,
        .free = cryptd_free,
        .module = THIS_MODULE,
};

struct cryptd_ablkcipher *cryptd_alloc_ablkcipher(const char *alg_name,
                                                  u32 type, u32 mask)
{
        char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
        struct crypto_tfm *tfm;

        if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
                     "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
                return ERR_PTR(-EINVAL);
        type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
        type |= CRYPTO_ALG_TYPE_BLKCIPHER;
        mask &= ~CRYPTO_ALG_TYPE_MASK;
        mask |= (CRYPTO_ALG_GENIV | CRYPTO_ALG_TYPE_BLKCIPHER_MASK);
        tfm = crypto_alloc_base(cryptd_alg_name, type, mask);
        if (IS_ERR(tfm))
                return ERR_CAST(tfm);
        if (tfm->__crt_alg->cra_module != THIS_MODULE) {
                crypto_free_tfm(tfm);
                return ERR_PTR(-EINVAL);
        }

        return __cryptd_ablkcipher_cast(__crypto_ablkcipher_cast(tfm));
}
EXPORT_SYMBOL_GPL(cryptd_alloc_ablkcipher);

struct crypto_blkcipher *cryptd_ablkcipher_child(struct cryptd_ablkcipher *tfm)
{
        struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(&tfm->base);
        return ctx->child;
}
EXPORT_SYMBOL_GPL(cryptd_ablkcipher_child);

void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm)
{
        crypto_free_ablkcipher(&tfm->base);
}
EXPORT_SYMBOL_GPL(cryptd_free_ablkcipher);

struct cryptd_ahash *cryptd_alloc_ahash(const char *alg_name,
                                        u32 type, u32 mask)
{
        char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
        struct crypto_ahash *tfm;

        if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
                     "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
                return ERR_PTR(-EINVAL);
        tfm = crypto_alloc_ahash(cryptd_alg_name, type, mask);
        if (IS_ERR(tfm))
                return ERR_CAST(tfm);
        if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
                crypto_free_ahash(tfm);
                return ERR_PTR(-EINVAL);
        }

        return __cryptd_ahash_cast(tfm);
}
EXPORT_SYMBOL_GPL(cryptd_alloc_ahash);

struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm)
{
        struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);

        return ctx->child;
}
EXPORT_SYMBOL_GPL(cryptd_ahash_child);

struct shash_desc *cryptd_shash_desc(struct ahash_request *req)
{
        struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
        return &rctx->desc;
}
EXPORT_SYMBOL_GPL(cryptd_shash_desc);

void cryptd_free_ahash(struct cryptd_ahash *tfm)
{
        crypto_free_ahash(&tfm->base);
}
EXPORT_SYMBOL_GPL(cryptd_free_ahash);

struct cryptd_aead *cryptd_alloc_aead(const char *alg_name,
                                                  u32 type, u32 mask)
{
        char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
        struct crypto_aead *tfm;

        if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
                     "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
                return ERR_PTR(-EINVAL);
        tfm = crypto_alloc_aead(cryptd_alg_name, type, mask);
        if (IS_ERR(tfm))
                return ERR_CAST(tfm);
        if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
                crypto_free_aead(tfm);
                return ERR_PTR(-EINVAL);
        }
        return __cryptd_aead_cast(tfm);
}
EXPORT_SYMBOL_GPL(cryptd_alloc_aead);

struct crypto_aead *cryptd_aead_child(struct cryptd_aead *tfm)
{
        struct cryptd_aead_ctx *ctx;
        ctx = crypto_aead_ctx(&tfm->base);
        return ctx->child;
}
EXPORT_SYMBOL_GPL(cryptd_aead_child);

void cryptd_free_aead(struct cryptd_aead *tfm)
{
        crypto_free_aead(&tfm->base);
}
EXPORT_SYMBOL_GPL(cryptd_free_aead);

static int __init cryptd_init(void)
{
        int err;

        err = cryptd_init_queue(&queue, CRYPTD_MAX_CPU_QLEN);
        if (err)
                return err;

        err = crypto_register_template(&cryptd_tmpl);
        if (err)
                cryptd_fini_queue(&queue);

        return err;
}

static void __exit cryptd_exit(void)
{
        cryptd_fini_queue(&queue);
        crypto_unregister_template(&cryptd_tmpl);
}

subsys_initcall(cryptd_init);
module_exit(cryptd_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Software async crypto daemon");
MODULE_ALIAS_CRYPTO("cryptd");