[linux.git] / crypto / cryptd.c

/*
 * Software async crypto daemon.
 *
 * Copyright (c) 2006 Herbert Xu <[email protected]>
 *
 * 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/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 *cpu_queue;
};

struct cryptd_instance_ctx {
	struct crypto_spawn 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_hash *child;
};

struct cryptd_hash_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 = per_cpu_ptr(queue->cpu_queue, cpu);
	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() */
	preempt_disable();
	backlog = crypto_get_backlog(&cpu_queue->queue);
	req = crypto_dequeue_request(&cpu_queue->queue);
	preempt_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 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 complete)
{
	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 = complete;

	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 struct crypto_instance *cryptd_alloc_instance(struct crypto_alg *alg,
						     struct cryptd_queue *queue)
{
	struct crypto_instance *inst;
	struct cryptd_instance_ctx *ctx;
	int err;

	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
	if (!inst) {
		inst = ERR_PTR(-ENOMEM);
		goto out;
	}

	err = -ENAMETOOLONG;
	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
		     "cryptd(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
		goto out_free_inst;

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

	ctx->queue = queue;

	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;

out:
	return inst;

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

static struct crypto_instance *cryptd_alloc_blkcipher(
	struct rtattr **tb, struct cryptd_queue *queue)
{
	struct crypto_instance *inst;
	struct crypto_alg *alg;

	alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER,
				  CRYPTO_ALG_TYPE_MASK);
	if (IS_ERR(alg))
		return ERR_CAST(alg);

	inst = cryptd_alloc_instance(alg, queue);
	if (IS_ERR(inst))
		goto out_put_alg;

	inst->alg.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC;
	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;

out_put_alg:
	crypto_mod_put(alg);
	return inst;
}

static int cryptd_hash_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_hash_ctx *ctx = crypto_tfm_ctx(tfm);
	struct crypto_hash *cipher;

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

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

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

	crypto_free_hash(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_hash     *child = ctx->child;
	int err;

	crypto_hash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
	crypto_hash_set_flags(child, crypto_ahash_get_flags(parent) &
					  CRYPTO_TFM_REQ_MASK);
	err = crypto_hash_setkey(child, key, keylen);
	crypto_ahash_set_flags(parent, crypto_hash_get_flags(child) &
					    CRYPTO_TFM_RES_MASK);
	return err;
}

static int cryptd_hash_enqueue(struct ahash_request *req,
				crypto_completion_t complete)
{
	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 = complete;

	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_hash     *child = ctx->child;
	struct ahash_request    *req = ahash_request_cast(req_async);
	struct cryptd_hash_request_ctx *rctx;
	struct hash_desc desc;

	rctx = ahash_request_ctx(req);

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

	desc.tfm = child;
	desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;

	err = crypto_hash_crt(child)->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 cryptd_hash_ctx *ctx   = crypto_tfm_ctx(req_async->tfm);
	struct crypto_hash     *child = ctx->child;
	struct ahash_request    *req = ahash_request_cast(req_async);
	struct cryptd_hash_request_ctx *rctx;
	struct hash_desc desc;

	rctx = ahash_request_ctx(req);

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

	desc.tfm = child;
	desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;

	err = crypto_hash_crt(child)->update(&desc,
						req->src,
						req->nbytes);

	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 cryptd_hash_ctx *ctx   = crypto_tfm_ctx(req_async->tfm);
	struct crypto_hash     *child = ctx->child;
	struct ahash_request    *req = ahash_request_cast(req_async);
	struct cryptd_hash_request_ctx *rctx;
	struct hash_desc desc;

	rctx = ahash_request_ctx(req);

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

	desc.tfm = child;
	desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;

	err = crypto_hash_crt(child)->final(&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_digest(struct crypto_async_request *req_async, int err)
{
	struct cryptd_hash_ctx *ctx   = crypto_tfm_ctx(req_async->tfm);
	struct crypto_hash     *child = ctx->child;
	struct ahash_request    *req = ahash_request_cast(req_async);
	struct cryptd_hash_request_ctx *rctx;
	struct hash_desc desc;

	rctx = ahash_request_ctx(req);

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

	desc.tfm = child;
	desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;

	err = crypto_hash_crt(child)->digest(&desc,
						req->src,
						req->nbytes,
						req->result);

	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 struct crypto_instance *cryptd_alloc_hash(
	struct rtattr **tb, struct cryptd_queue *queue)
{
	struct crypto_instance *inst;
	struct crypto_alg *alg;

	alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_HASH,
				  CRYPTO_ALG_TYPE_HASH_MASK);
	if (IS_ERR(alg))
		return ERR_PTR(PTR_ERR(alg));

	inst = cryptd_alloc_instance(alg, queue);
	if (IS_ERR(inst))
		goto out_put_alg;

	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AHASH | CRYPTO_ALG_ASYNC;
	inst->alg.cra_type = &crypto_ahash_type;

	inst->alg.cra_ahash.digestsize = alg->cra_hash.digestsize;
	inst->alg.cra_ctxsize = sizeof(struct cryptd_hash_ctx);

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

	inst->alg.cra_ahash.init   = cryptd_hash_init_enqueue;
	inst->alg.cra_ahash.update = cryptd_hash_update_enqueue;
	inst->alg.cra_ahash.final  = cryptd_hash_final_enqueue;
	inst->alg.cra_ahash.setkey = cryptd_hash_setkey;
	inst->alg.cra_ahash.digest = cryptd_hash_digest_enqueue;

out_put_alg:
	crypto_mod_put(alg);
	return inst;
}

static struct cryptd_queue queue;

static struct crypto_instance *cryptd_alloc(struct rtattr **tb)
{
	struct crypto_attr_type *algt;

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

	switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
	case CRYPTO_ALG_TYPE_BLKCIPHER:
		return cryptd_alloc_blkcipher(tb, &queue);
	case CRYPTO_ALG_TYPE_DIGEST:
		return cryptd_alloc_hash(tb, &queue);
	}

	return ERR_PTR(-EINVAL);
}

static void cryptd_free(struct crypto_instance *inst)
{
	struct cryptd_instance_ctx *ctx = crypto_instance_ctx(inst);

	crypto_drop_spawn(&ctx->spawn);
	kfree(inst);
}

static struct crypto_template cryptd_tmpl = {
	.name = "cryptd",
	.alloc = cryptd_alloc,
	.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_ablkcipher *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_ablkcipher(cryptd_alg_name, type, mask);
	if (IS_ERR(tfm))
		return ERR_CAST(tfm);
	if (crypto_ablkcipher_tfm(tfm)->__crt_alg->cra_module != THIS_MODULE) {
		crypto_free_ablkcipher(tfm);
		return ERR_PTR(-EINVAL);
	}

	return __cryptd_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);

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);
}

module_init(cryptd_init);
module_exit(cryptd_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Software async crypto daemon");
Commit	Line	Data
124b53d0 HX	1	/*
	2	* Software async crypto daemon.
	3	*
	4	* Copyright (c) 2006 Herbert Xu <[email protected]>
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License as published by the Free
	8	* Software Foundation; either version 2 of the License, or (at your option)
	9	* any later version.
	10	*
	11	*/
	12
	13	#include <crypto/algapi.h>
18e33e6d	14	#include <crypto/internal/hash.h>
1cac2cbc	15	#include <crypto/cryptd.h>
254eff77	16	#include <crypto/crypto_wq.h>
124b53d0 HX	17	#include <linux/err.h>
	18	#include <linux/init.h>
	19	#include <linux/kernel.h>
124b53d0 HX	20	#include <linux/list.h>
124b53d0 HX	21	#include <linux/module.h>
124b53d0 HX	22	#include <linux/scatterlist.h>
	23	#include <linux/sched.h>
	24	#include <linux/slab.h>
124b53d0	25
254eff77	26	#define CRYPTD_MAX_CPU_QLEN 100
124b53d0	27
254eff77	28	struct cryptd_cpu_queue {
124b53d0	29	struct crypto_queue queue;
254eff77 YH	30	struct work_struct work;
	31	};
	32
	33	struct cryptd_queue {
	34	struct cryptd_cpu_queue *cpu_queue;
124b53d0 HX	35	};
	36
	37	struct cryptd_instance_ctx {
	38	struct crypto_spawn spawn;
254eff77	39	struct cryptd_queue *queue;
124b53d0 HX	40	};
	41
	42	struct cryptd_blkcipher_ctx {
	43	struct crypto_blkcipher *child;
	44	};
	45
	46	struct cryptd_blkcipher_request_ctx {
	47	crypto_completion_t complete;
	48	};
	49
b8a28251 LH	50	struct cryptd_hash_ctx {
	51	struct crypto_hash *child;
	52	};
	53
	54	struct cryptd_hash_request_ctx {
	55	crypto_completion_t complete;
	56	};
124b53d0	57
254eff77 YH	58	static void cryptd_queue_worker(struct work_struct *work);
	59
	60	static int cryptd_init_queue(struct cryptd_queue *queue,
	61	unsigned int max_cpu_qlen)
	62	{
	63	int cpu;
	64	struct cryptd_cpu_queue *cpu_queue;
	65
	66	queue->cpu_queue = alloc_percpu(struct cryptd_cpu_queue);
	67	if (!queue->cpu_queue)
	68	return -ENOMEM;
	69	for_each_possible_cpu(cpu) {
	70	cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
	71	crypto_init_queue(&cpu_queue->queue, max_cpu_qlen);
	72	INIT_WORK(&cpu_queue->work, cryptd_queue_worker);
	73	}
	74	return 0;
	75	}
	76
	77	static void cryptd_fini_queue(struct cryptd_queue *queue)
	78	{
	79	int cpu;
	80	struct cryptd_cpu_queue *cpu_queue;
	81
	82	for_each_possible_cpu(cpu) {
	83	cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
	84	BUG_ON(cpu_queue->queue.qlen);
	85	}
	86	free_percpu(queue->cpu_queue);
	87	}
	88
	89	static int cryptd_enqueue_request(struct cryptd_queue *queue,
	90	struct crypto_async_request *request)
	91	{
	92	int cpu, err;
	93	struct cryptd_cpu_queue *cpu_queue;
	94
	95	cpu = get_cpu();
	96	cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
	97	err = crypto_enqueue_request(&cpu_queue->queue, request);
	98	queue_work_on(cpu, kcrypto_wq, &cpu_queue->work);
	99	put_cpu();
	100
	101	return err;
	102	}
	103
	104	/* Called in workqueue context, do one real cryption work (via
	105	* req->complete) and reschedule itself if there are more work to
	106	* do. */
	107	static void cryptd_queue_worker(struct work_struct *work)
	108	{
	109	struct cryptd_cpu_queue *cpu_queue;
	110	struct crypto_async_request req, backlog;
	111
	112	cpu_queue = container_of(work, struct cryptd_cpu_queue, work);
	113	/* Only handle one request at a time to avoid hogging crypto
	114	* workqueue. preempt_disable/enable is used to prevent
	115	* being preempted by cryptd_enqueue_request() */
	116	preempt_disable();
	117	backlog = crypto_get_backlog(&cpu_queue->queue);
	118	req = crypto_dequeue_request(&cpu_queue->queue);
	119	preempt_enable();
	120
	121	if (!req)
122	return;
123
124	if (backlog)
125	backlog->complete(backlog, -EINPROGRESS);
126	req->complete(req, 0);
127
128	if (cpu_queue->queue.qlen)
129	queue_work(kcrypto_wq, &cpu_queue->work);
130	}
131
132	static inline struct cryptd_queue cryptd_get_queue(struct crypto_tfm tfm)
124b53d0 HX	133	{
	134	struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
	135	struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
254eff77	136	return ictx->queue;
124b53d0 HX	137	}
	138
	139	static int cryptd_blkcipher_setkey(struct crypto_ablkcipher *parent,
	140	const u8 *key, unsigned int keylen)
	141	{
	142	struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(parent);
	143	struct crypto_blkcipher *child = ctx->child;
	144	int err;
	145
	146	crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
	147	crypto_blkcipher_set_flags(child, crypto_ablkcipher_get_flags(parent) &
	148	CRYPTO_TFM_REQ_MASK);
	149	err = crypto_blkcipher_setkey(child, key, keylen);
	150	crypto_ablkcipher_set_flags(parent, crypto_blkcipher_get_flags(child) &
	151	CRYPTO_TFM_RES_MASK);
	152	return err;
	153	}
	154
	155	static void cryptd_blkcipher_crypt(struct ablkcipher_request *req,
	156	struct crypto_blkcipher *child,
	157	int err,
	158	int (crypt)(struct blkcipher_desc desc,
	159	struct scatterlist *dst,
	160	struct scatterlist *src,
	161	unsigned int len))
	162	{
	163	struct cryptd_blkcipher_request_ctx *rctx;
	164	struct blkcipher_desc desc;
	165
	166	rctx = ablkcipher_request_ctx(req);
	167
93aa7f8a HX	168	if (unlikely(err == -EINPROGRESS))
93aa7f8a HX	169	goto out;
124b53d0 HX	170
	171	desc.tfm = child;
	172	desc.info = req->info;
	173	desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
	174
	175	err = crypt(&desc, req->dst, req->src, req->nbytes);
	176
	177	req->base.complete = rctx->complete;
	178
93aa7f8a	179	out:
124b53d0	180	local_bh_disable();
93aa7f8a	181	rctx->complete(&req->base, err);
124b53d0 HX	182	local_bh_enable();
	183	}
	184
	185	static void cryptd_blkcipher_encrypt(struct crypto_async_request *req, int err)
	186	{
	187	struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
	188	struct crypto_blkcipher *child = ctx->child;
	189
	190	cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
	191	crypto_blkcipher_crt(child)->encrypt);
	192	}
	193
	194	static void cryptd_blkcipher_decrypt(struct crypto_async_request *req, int err)
	195	{
	196	struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm);
	197	struct crypto_blkcipher *child = ctx->child;
	198
	199	cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err,
	200	crypto_blkcipher_crt(child)->decrypt);
	201	}
	202
	203	static int cryptd_blkcipher_enqueue(struct ablkcipher_request *req,
	204	crypto_completion_t complete)
	205	{
	206	struct cryptd_blkcipher_request_ctx *rctx = ablkcipher_request_ctx(req);
	207	struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
254eff77	208	struct cryptd_queue *queue;
124b53d0	209
254eff77	210	queue = cryptd_get_queue(crypto_ablkcipher_tfm(tfm));
124b53d0 HX	211	rctx->complete = req->base.complete;
	212	req->base.complete = complete;
	213
254eff77	214	return cryptd_enqueue_request(queue, &req->base);
124b53d0 HX	215	}
	216
	217	static int cryptd_blkcipher_encrypt_enqueue(struct ablkcipher_request *req)
	218	{
	219	return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_encrypt);
	220	}
	221
	222	static int cryptd_blkcipher_decrypt_enqueue(struct ablkcipher_request *req)
	223	{
	224	return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_decrypt);
	225	}
	226
	227	static int cryptd_blkcipher_init_tfm(struct crypto_tfm *tfm)
	228	{
	229	struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
	230	struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
	231	struct crypto_spawn *spawn = &ictx->spawn;
	232	struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
	233	struct crypto_blkcipher *cipher;
	234
	235	cipher = crypto_spawn_blkcipher(spawn);
	236	if (IS_ERR(cipher))
	237	return PTR_ERR(cipher);
	238
	239	ctx->child = cipher;
	240	tfm->crt_ablkcipher.reqsize =
	241	sizeof(struct cryptd_blkcipher_request_ctx);
	242	return 0;
	243	}
	244
	245	static void cryptd_blkcipher_exit_tfm(struct crypto_tfm *tfm)
	246	{
	247	struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
124b53d0 HX	248
	249	crypto_free_blkcipher(ctx->child);
	250	}
	251
	252	static struct crypto_instance cryptd_alloc_instance(struct crypto_alg alg,
254eff77	253	struct cryptd_queue *queue)
124b53d0 HX	254	{
	255	struct crypto_instance *inst;
	256	struct cryptd_instance_ctx *ctx;
	257	int err;
	258
	259	inst = kzalloc(sizeof(inst) + sizeof(ctx), GFP_KERNEL);
b1145ce3 JL	260	if (!inst) {
b1145ce3 JL	261	inst = ERR_PTR(-ENOMEM);
124b53d0	262	goto out;
b1145ce3	263	}
124b53d0 HX	264
	265	err = -ENAMETOOLONG;
	266	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
	267	"cryptd(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
	268	goto out_free_inst;
	269
	270	ctx = crypto_instance_ctx(inst);
	271	err = crypto_init_spawn(&ctx->spawn, alg, inst,
	272	CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_ASYNC);
	273	if (err)
	274	goto out_free_inst;
	275
254eff77	276	ctx->queue = queue;
124b53d0 HX	277
	278	memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
	279
	280	inst->alg.cra_priority = alg->cra_priority + 50;
	281	inst->alg.cra_blocksize = alg->cra_blocksize;
	282	inst->alg.cra_alignmask = alg->cra_alignmask;
	283
	284	out:
	285	return inst;
	286
	287	out_free_inst:
	288	kfree(inst);
	289	inst = ERR_PTR(err);
	290	goto out;
	291	}
	292
	293	static struct crypto_instance *cryptd_alloc_blkcipher(
254eff77	294	struct rtattr *tb, struct cryptd_queue queue)
124b53d0 HX	295	{
	296	struct crypto_instance *inst;
	297	struct crypto_alg *alg;
	298
	299	alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER,
332f8840	300	CRYPTO_ALG_TYPE_MASK);
124b53d0	301	if (IS_ERR(alg))
e231c2ee	302	return ERR_CAST(alg);
124b53d0	303
254eff77	304	inst = cryptd_alloc_instance(alg, queue);
124b53d0 HX	305	if (IS_ERR(inst))
	306	goto out_put_alg;
	307
332f8840	308	inst->alg.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER \| CRYPTO_ALG_ASYNC;
124b53d0 HX	309	inst->alg.cra_type = &crypto_ablkcipher_type;
	310
	311	inst->alg.cra_ablkcipher.ivsize = alg->cra_blkcipher.ivsize;
	312	inst->alg.cra_ablkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
	313	inst->alg.cra_ablkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
	314
927eead5 HX	315	inst->alg.cra_ablkcipher.geniv = alg->cra_blkcipher.geniv;
927eead5 HX	316
124b53d0 HX	317	inst->alg.cra_ctxsize = sizeof(struct cryptd_blkcipher_ctx);
	318
	319	inst->alg.cra_init = cryptd_blkcipher_init_tfm;
	320	inst->alg.cra_exit = cryptd_blkcipher_exit_tfm;
	321
	322	inst->alg.cra_ablkcipher.setkey = cryptd_blkcipher_setkey;
	323	inst->alg.cra_ablkcipher.encrypt = cryptd_blkcipher_encrypt_enqueue;
	324	inst->alg.cra_ablkcipher.decrypt = cryptd_blkcipher_decrypt_enqueue;
	325
124b53d0 HX	326	out_put_alg:
	327	crypto_mod_put(alg);
	328	return inst;
	329	}
	330
b8a28251 LH	331	static int cryptd_hash_init_tfm(struct crypto_tfm *tfm)
	332	{
	333	struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
	334	struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
	335	struct crypto_spawn *spawn = &ictx->spawn;
	336	struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
	337	struct crypto_hash *cipher;
	338
	339	cipher = crypto_spawn_hash(spawn);
	340	if (IS_ERR(cipher))
	341	return PTR_ERR(cipher);
	342
	343	ctx->child = cipher;
	344	tfm->crt_ahash.reqsize =
	345	sizeof(struct cryptd_hash_request_ctx);
	346	return 0;
	347	}
	348
	349	static void cryptd_hash_exit_tfm(struct crypto_tfm *tfm)
	350	{
	351	struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
b8a28251 LH	352
	353	crypto_free_hash(ctx->child);
	354	}
	355
	356	static int cryptd_hash_setkey(struct crypto_ahash *parent,
	357	const u8 *key, unsigned int keylen)
	358	{
	359	struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(parent);
	360	struct crypto_hash *child = ctx->child;
	361	int err;
	362
	363	crypto_hash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
	364	crypto_hash_set_flags(child, crypto_ahash_get_flags(parent) &
	365	CRYPTO_TFM_REQ_MASK);
	366	err = crypto_hash_setkey(child, key, keylen);
	367	crypto_ahash_set_flags(parent, crypto_hash_get_flags(child) &
	368	CRYPTO_TFM_RES_MASK);
	369	return err;
	370	}
	371
	372	static int cryptd_hash_enqueue(struct ahash_request *req,
	373	crypto_completion_t complete)
	374	{
	375	struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
	376	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
254eff77 YH	377	struct cryptd_queue *queue =
254eff77 YH	378	cryptd_get_queue(crypto_ahash_tfm(tfm));
b8a28251 LH	379
	380	rctx->complete = req->base.complete;
	381	req->base.complete = complete;
	382
254eff77	383	return cryptd_enqueue_request(queue, &req->base);
b8a28251 LH	384	}
	385
	386	static void cryptd_hash_init(struct crypto_async_request *req_async, int err)
	387	{
	388	struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
	389	struct crypto_hash *child = ctx->child;
	390	struct ahash_request *req = ahash_request_cast(req_async);
	391	struct cryptd_hash_request_ctx *rctx;
	392	struct hash_desc desc;
	393
	394	rctx = ahash_request_ctx(req);
	395
	396	if (unlikely(err == -EINPROGRESS))
	397	goto out;
	398
	399	desc.tfm = child;
	400	desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
	401
	402	err = crypto_hash_crt(child)->init(&desc);
	403
	404	req->base.complete = rctx->complete;
	405
	406	out:
	407	local_bh_disable();
	408	rctx->complete(&req->base, err);
	409	local_bh_enable();
	410	}
	411
	412	static int cryptd_hash_init_enqueue(struct ahash_request *req)
	413	{
	414	return cryptd_hash_enqueue(req, cryptd_hash_init);
	415	}
	416
	417	static void cryptd_hash_update(struct crypto_async_request *req_async, int err)
	418	{
	419	struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
	420	struct crypto_hash *child = ctx->child;
	421	struct ahash_request *req = ahash_request_cast(req_async);
	422	struct cryptd_hash_request_ctx *rctx;
	423	struct hash_desc desc;
	424
	425	rctx = ahash_request_ctx(req);
	426
	427	if (unlikely(err == -EINPROGRESS))
	428	goto out;
	429
	430	desc.tfm = child;
	431	desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
	432
	433	err = crypto_hash_crt(child)->update(&desc,
	434	req->src,
	435	req->nbytes);
	436
	437	req->base.complete = rctx->complete;
	438
	439	out:
	440	local_bh_disable();
	441	rctx->complete(&req->base, err);
	442	local_bh_enable();
	443	}
	444
	445	static int cryptd_hash_update_enqueue(struct ahash_request *req)
	446	{
	447	return cryptd_hash_enqueue(req, cryptd_hash_update);
448	}
449
450	static void cryptd_hash_final(struct crypto_async_request *req_async, int err)
451	{
452	struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
453	struct crypto_hash *child = ctx->child;
454	struct ahash_request *req = ahash_request_cast(req_async);
455	struct cryptd_hash_request_ctx *rctx;
456	struct hash_desc desc;
457
458	rctx = ahash_request_ctx(req);
459
460	if (unlikely(err == -EINPROGRESS))
461	goto out;
462
463	desc.tfm = child;
464	desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
465
466	err = crypto_hash_crt(child)->final(&desc, req->result);
467
468	req->base.complete = rctx->complete;
469
470	out:
471	local_bh_disable();
472	rctx->complete(&req->base, err);
473	local_bh_enable();
474	}
475
476	static int cryptd_hash_final_enqueue(struct ahash_request *req)
477	{
478	return cryptd_hash_enqueue(req, cryptd_hash_final);
479	}
480
481	static void cryptd_hash_digest(struct crypto_async_request *req_async, int err)
482	{
483	struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
484	struct crypto_hash *child = ctx->child;
485	struct ahash_request *req = ahash_request_cast(req_async);
486	struct cryptd_hash_request_ctx *rctx;
487	struct hash_desc desc;
488
489	rctx = ahash_request_ctx(req);
490
491	if (unlikely(err == -EINPROGRESS))
492	goto out;
493
494	desc.tfm = child;
495	desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
496
497	err = crypto_hash_crt(child)->digest(&desc,
498	req->src,
499	req->nbytes,
500	req->result);
501
502	req->base.complete = rctx->complete;
503
504	out:
505	local_bh_disable();
506	rctx->complete(&req->base, err);
507	local_bh_enable();
508	}
509
510	static int cryptd_hash_digest_enqueue(struct ahash_request *req)
511	{
512	return cryptd_hash_enqueue(req, cryptd_hash_digest);
513	}
514
515	static struct crypto_instance *cryptd_alloc_hash(
254eff77	516	struct rtattr *tb, struct cryptd_queue queue)
b8a28251 LH	517	{
	518	struct crypto_instance *inst;
	519	struct crypto_alg *alg;
	520
	521	alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_HASH,
	522	CRYPTO_ALG_TYPE_HASH_MASK);
	523	if (IS_ERR(alg))
	524	return ERR_PTR(PTR_ERR(alg));
	525
254eff77	526	inst = cryptd_alloc_instance(alg, queue);
b8a28251 LH	527	if (IS_ERR(inst))
	528	goto out_put_alg;
	529
	530	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AHASH \| CRYPTO_ALG_ASYNC;
	531	inst->alg.cra_type = &crypto_ahash_type;
	532
	533	inst->alg.cra_ahash.digestsize = alg->cra_hash.digestsize;
	534	inst->alg.cra_ctxsize = sizeof(struct cryptd_hash_ctx);
	535
	536	inst->alg.cra_init = cryptd_hash_init_tfm;
	537	inst->alg.cra_exit = cryptd_hash_exit_tfm;
	538
	539	inst->alg.cra_ahash.init = cryptd_hash_init_enqueue;
	540	inst->alg.cra_ahash.update = cryptd_hash_update_enqueue;
	541	inst->alg.cra_ahash.final = cryptd_hash_final_enqueue;
	542	inst->alg.cra_ahash.setkey = cryptd_hash_setkey;
	543	inst->alg.cra_ahash.digest = cryptd_hash_digest_enqueue;
	544
	545	out_put_alg:
	546	crypto_mod_put(alg);
	547	return inst;
	548	}
	549
254eff77	550	static struct cryptd_queue queue;
124b53d0 HX	551
	552	static struct crypto_instance cryptd_alloc(struct rtattr *tb)
	553	{
	554	struct crypto_attr_type *algt;
	555
	556	algt = crypto_get_attr_type(tb);
	557	if (IS_ERR(algt))
e231c2ee	558	return ERR_CAST(algt);
124b53d0 HX	559
	560	switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
	561	case CRYPTO_ALG_TYPE_BLKCIPHER:
254eff77	562	return cryptd_alloc_blkcipher(tb, &queue);
b8a28251	563	case CRYPTO_ALG_TYPE_DIGEST:
254eff77	564	return cryptd_alloc_hash(tb, &queue);
124b53d0 HX	565	}
	566
	567	return ERR_PTR(-EINVAL);
	568	}
	569
	570	static void cryptd_free(struct crypto_instance *inst)
	571	{
	572	struct cryptd_instance_ctx *ctx = crypto_instance_ctx(inst);
	573
	574	crypto_drop_spawn(&ctx->spawn);
	575	kfree(inst);
	576	}
	577
	578	static struct crypto_template cryptd_tmpl = {
	579	.name = "cryptd",
	580	.alloc = cryptd_alloc,
	581	.free = cryptd_free,
	582	.module = THIS_MODULE,
	583	};
	584
1cac2cbc YH	585	struct cryptd_ablkcipher cryptd_alloc_ablkcipher(const char alg_name,
	586	u32 type, u32 mask)
	587	{
	588	char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
	589	struct crypto_ablkcipher *tfm;
	590
	591	if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
	592	"cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
	593	return ERR_PTR(-EINVAL);
	594	tfm = crypto_alloc_ablkcipher(cryptd_alg_name, type, mask);
	595	if (IS_ERR(tfm))
	596	return ERR_CAST(tfm);
	597	if (crypto_ablkcipher_tfm(tfm)->__crt_alg->cra_module != THIS_MODULE) {
	598	crypto_free_ablkcipher(tfm);
	599	return ERR_PTR(-EINVAL);
	600	}
	601
	602	return __cryptd_ablkcipher_cast(tfm);
	603	}
	604	EXPORT_SYMBOL_GPL(cryptd_alloc_ablkcipher);
	605
	606	struct crypto_blkcipher cryptd_ablkcipher_child(struct cryptd_ablkcipher tfm)
	607	{
	608	struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(&tfm->base);
	609	return ctx->child;
	610	}
	611	EXPORT_SYMBOL_GPL(cryptd_ablkcipher_child);
	612
	613	void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm)
	614	{
	615	crypto_free_ablkcipher(&tfm->base);
	616	}
	617	EXPORT_SYMBOL_GPL(cryptd_free_ablkcipher);
	618
124b53d0 HX	619	static int __init cryptd_init(void)
	620	{
	621	int err;
	622
254eff77	623	err = cryptd_init_queue(&queue, CRYPTD_MAX_CPU_QLEN);
124b53d0 HX	624	if (err)
	625	return err;
	626
	627	err = crypto_register_template(&cryptd_tmpl);
	628	if (err)
254eff77	629	cryptd_fini_queue(&queue);
124b53d0 HX	630
	631	return err;
	632	}
	633
	634	static void __exit cryptd_exit(void)
	635	{
254eff77	636	cryptd_fini_queue(&queue);
124b53d0 HX	637	crypto_unregister_template(&cryptd_tmpl);
	638	}
	639
	640	module_init(cryptd_init);
	641	module_exit(cryptd_exit);
	642
	643	MODULE_LICENSE("GPL");
	644	MODULE_DESCRIPTION("Software async crypto daemon");