[linux-2.6-block.git] / crypto / acompress.c

/*
 * Asynchronous Compression operations
 *
 * Copyright (c) 2016, Intel Corporation
 * Authors: Weigang Li <weigang.li@intel.com>
 *          Giovanni Cabiddu <giovanni.cabiddu@intel.com>
 *
 * 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 <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/crypto.h>
#include <crypto/algapi.h>
#include <linux/cryptouser.h>
#include <linux/compiler.h>
#include <net/netlink.h>
#include <crypto/internal/acompress.h>
#include <crypto/internal/scompress.h>
#include "internal.h"

static const struct crypto_type crypto_acomp_type;

#ifdef CONFIG_NET
static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	struct crypto_report_acomp racomp;

	strncpy(racomp.type, "acomp", sizeof(racomp.type));

	if (nla_put(skb, CRYPTOCFGA_REPORT_ACOMP,
		    sizeof(struct crypto_report_acomp), &racomp))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -EMSGSIZE;
}
#else
static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	return -ENOSYS;
}
#endif

static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
	__maybe_unused;

static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
{
	seq_puts(m, "type         : acomp\n");
}

static void crypto_acomp_exit_tfm(struct crypto_tfm *tfm)
{
	struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
	struct acomp_alg *alg = crypto_acomp_alg(acomp);

	alg->exit(acomp);
}

static int crypto_acomp_init_tfm(struct crypto_tfm *tfm)
{
	struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
	struct acomp_alg *alg = crypto_acomp_alg(acomp);

	if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
		return crypto_init_scomp_ops_async(tfm);

	acomp->compress = alg->compress;
	acomp->decompress = alg->decompress;
	acomp->dst_free = alg->dst_free;
	acomp->reqsize = alg->reqsize;

	if (alg->exit)
		acomp->base.exit = crypto_acomp_exit_tfm;

	if (alg->init)
		return alg->init(acomp);

	return 0;
}

static unsigned int crypto_acomp_extsize(struct crypto_alg *alg)
{
	int extsize = crypto_alg_extsize(alg);

	if (alg->cra_type != &crypto_acomp_type)
		extsize += sizeof(struct crypto_scomp *);

	return extsize;
}

static const struct crypto_type crypto_acomp_type = {
	.extsize = crypto_acomp_extsize,
	.init_tfm = crypto_acomp_init_tfm,
#ifdef CONFIG_PROC_FS
	.show = crypto_acomp_show,
#endif
	.report = crypto_acomp_report,
	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	.maskset = CRYPTO_ALG_TYPE_ACOMPRESS_MASK,
	.type = CRYPTO_ALG_TYPE_ACOMPRESS,
	.tfmsize = offsetof(struct crypto_acomp, base),
};

struct crypto_acomp *crypto_alloc_acomp(const char *alg_name, u32 type,
					u32 mask)
{
	return crypto_alloc_tfm(alg_name, &crypto_acomp_type, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_alloc_acomp);

struct acomp_req *acomp_request_alloc(struct crypto_acomp *acomp)
{
	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
	struct acomp_req *req;

	req = __acomp_request_alloc(acomp);
	if (req && (tfm->__crt_alg->cra_type != &crypto_acomp_type))
		return crypto_acomp_scomp_alloc_ctx(req);

	return req;
}
EXPORT_SYMBOL_GPL(acomp_request_alloc);

void acomp_request_free(struct acomp_req *req)
{
	struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);

	if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
		crypto_acomp_scomp_free_ctx(req);

	if (req->flags & CRYPTO_ACOMP_ALLOC_OUTPUT) {
		acomp->dst_free(req->dst);
		req->dst = NULL;
	}

	__acomp_request_free(req);
}
EXPORT_SYMBOL_GPL(acomp_request_free);

int crypto_register_acomp(struct acomp_alg *alg)
{
	struct crypto_alg *base = &alg->base;

	base->cra_type = &crypto_acomp_type;
	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	base->cra_flags |= CRYPTO_ALG_TYPE_ACOMPRESS;

	return crypto_register_alg(base);
}
EXPORT_SYMBOL_GPL(crypto_register_acomp);

int crypto_unregister_acomp(struct acomp_alg *alg)
{
	return crypto_unregister_alg(&alg->base);
}
EXPORT_SYMBOL_GPL(crypto_unregister_acomp);

int crypto_register_acomps(struct acomp_alg *algs, int count)
{
	int i, ret;

	for (i = 0; i < count; i++) {
		ret = crypto_register_acomp(&algs[i]);
		if (ret)
			goto err;
	}

	return 0;

err:
	for (--i; i >= 0; --i)
		crypto_unregister_acomp(&algs[i]);

	return ret;
}
EXPORT_SYMBOL_GPL(crypto_register_acomps);

void crypto_unregister_acomps(struct acomp_alg *algs, int count)
{
	int i;

	for (i = count - 1; i >= 0; --i)
		crypto_unregister_acomp(&algs[i]);
}
EXPORT_SYMBOL_GPL(crypto_unregister_acomps);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Asynchronous compression type");
Commit	Line	Data
2ebda74f GC	1	/*
	2	* Asynchronous Compression operations
	3	*
	4	* Copyright (c) 2016, Intel Corporation
	5	* Authors: Weigang Li <weigang.li@intel.com>
	6	* Giovanni Cabiddu <giovanni.cabiddu@intel.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the Free
	10	* Software Foundation; either version 2 of the License, or (at your option)
	11	* any later version.
	12	*
	13	*/
	14	#include <linux/errno.h>
	15	#include <linux/kernel.h>
	16	#include <linux/module.h>
	17	#include <linux/seq_file.h>
	18	#include <linux/slab.h>
	19	#include <linux/string.h>
	20	#include <linux/crypto.h>
	21	#include <crypto/algapi.h>
	22	#include <linux/cryptouser.h>
d8c34b94	23	#include <linux/compiler.h>
2ebda74f GC	24	#include <net/netlink.h>
2ebda74f GC	25	#include <crypto/internal/acompress.h>
1ab53a77	26	#include <crypto/internal/scompress.h>
2ebda74f GC	27	#include "internal.h"
2ebda74f GC	28
1ab53a77 GC	29	static const struct crypto_type crypto_acomp_type;
1ab53a77 GC	30
2ebda74f GC	31	#ifdef CONFIG_NET
	32	static int crypto_acomp_report(struct sk_buff skb, struct crypto_alg alg)
	33	{
	34	struct crypto_report_acomp racomp;
	35
	36	strncpy(racomp.type, "acomp", sizeof(racomp.type));
	37
	38	if (nla_put(skb, CRYPTOCFGA_REPORT_ACOMP,
	39	sizeof(struct crypto_report_acomp), &racomp))
	40	goto nla_put_failure;
	41	return 0;
	42
	43	nla_put_failure:
	44	return -EMSGSIZE;
	45	}
	46	#else
	47	static int crypto_acomp_report(struct sk_buff skb, struct crypto_alg alg)
	48	{
	49	return -ENOSYS;
	50	}
	51	#endif
	52
	53	static void crypto_acomp_show(struct seq_file m, struct crypto_alg alg)
d8c34b94	54	__maybe_unused;
2ebda74f GC	55
	56	static void crypto_acomp_show(struct seq_file m, struct crypto_alg alg)
	57	{
	58	seq_puts(m, "type : acomp\n");
	59	}
	60
	61	static void crypto_acomp_exit_tfm(struct crypto_tfm *tfm)
	62	{
	63	struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
	64	struct acomp_alg *alg = crypto_acomp_alg(acomp);
	65
	66	alg->exit(acomp);
	67	}
	68
	69	static int crypto_acomp_init_tfm(struct crypto_tfm *tfm)
	70	{
	71	struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
	72	struct acomp_alg *alg = crypto_acomp_alg(acomp);
	73
1ab53a77 GC	74	if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
	75	return crypto_init_scomp_ops_async(tfm);
	76
	77	acomp->compress = alg->compress;
	78	acomp->decompress = alg->decompress;
	79	acomp->dst_free = alg->dst_free;
	80	acomp->reqsize = alg->reqsize;
	81
2ebda74f GC	82	if (alg->exit)
	83	acomp->base.exit = crypto_acomp_exit_tfm;
	84
	85	if (alg->init)
	86	return alg->init(acomp);
	87
	88	return 0;
	89	}
	90
1ab53a77 GC	91	static unsigned int crypto_acomp_extsize(struct crypto_alg *alg)
	92	{
	93	int extsize = crypto_alg_extsize(alg);
	94
	95	if (alg->cra_type != &crypto_acomp_type)
	96	extsize += sizeof(struct crypto_scomp *);
	97
	98	return extsize;
	99	}
	100
2ebda74f	101	static const struct crypto_type crypto_acomp_type = {
1ab53a77	102	.extsize = crypto_acomp_extsize,
2ebda74f GC	103	.init_tfm = crypto_acomp_init_tfm,
	104	#ifdef CONFIG_PROC_FS
	105	.show = crypto_acomp_show,
	106	#endif
	107	.report = crypto_acomp_report,
	108	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
1ab53a77	109	.maskset = CRYPTO_ALG_TYPE_ACOMPRESS_MASK,
2ebda74f GC	110	.type = CRYPTO_ALG_TYPE_ACOMPRESS,
	111	.tfmsize = offsetof(struct crypto_acomp, base),
	112	};
	113
	114	struct crypto_acomp crypto_alloc_acomp(const char alg_name, u32 type,
	115	u32 mask)
	116	{
	117	return crypto_alloc_tfm(alg_name, &crypto_acomp_type, type, mask);
	118	}
	119	EXPORT_SYMBOL_GPL(crypto_alloc_acomp);
	120
1ab53a77 GC	121	struct acomp_req acomp_request_alloc(struct crypto_acomp acomp)
	122	{
	123	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
	124	struct acomp_req *req;
	125
	126	req = __acomp_request_alloc(acomp);
	127	if (req && (tfm->__crt_alg->cra_type != &crypto_acomp_type))
	128	return crypto_acomp_scomp_alloc_ctx(req);
	129
	130	return req;
	131	}
	132	EXPORT_SYMBOL_GPL(acomp_request_alloc);
	133
	134	void acomp_request_free(struct acomp_req *req)
	135	{
	136	struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
	137	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
	138
	139	if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
	140	crypto_acomp_scomp_free_ctx(req);
	141
	142	if (req->flags & CRYPTO_ACOMP_ALLOC_OUTPUT) {
	143	acomp->dst_free(req->dst);
	144	req->dst = NULL;
	145	}
	146
	147	__acomp_request_free(req);
	148	}
	149	EXPORT_SYMBOL_GPL(acomp_request_free);
	150
2ebda74f GC	151	int crypto_register_acomp(struct acomp_alg *alg)
	152	{
	153	struct crypto_alg *base = &alg->base;
	154
	155	base->cra_type = &crypto_acomp_type;
	156	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	157	base->cra_flags \|= CRYPTO_ALG_TYPE_ACOMPRESS;
	158
	159	return crypto_register_alg(base);
	160	}
	161	EXPORT_SYMBOL_GPL(crypto_register_acomp);
	162
	163	int crypto_unregister_acomp(struct acomp_alg *alg)
	164	{
	165	return crypto_unregister_alg(&alg->base);
	166	}
	167	EXPORT_SYMBOL_GPL(crypto_unregister_acomp);
	168
3ce5bc72 GC	169	int crypto_register_acomps(struct acomp_alg *algs, int count)
	170	{
	171	int i, ret;
	172
	173	for (i = 0; i < count; i++) {
	174	ret = crypto_register_acomp(&algs[i]);
	175	if (ret)
	176	goto err;
	177	}
	178
	179	return 0;
	180
	181	err:
	182	for (--i; i >= 0; --i)
	183	crypto_unregister_acomp(&algs[i]);
	184
	185	return ret;
	186	}
	187	EXPORT_SYMBOL_GPL(crypto_register_acomps);
	188
	189	void crypto_unregister_acomps(struct acomp_alg *algs, int count)
	190	{
	191	int i;
	192
	193	for (i = count - 1; i >= 0; --i)
	194	crypto_unregister_acomp(&algs[i]);
	195	}
	196	EXPORT_SYMBOL_GPL(crypto_unregister_acomps);
	197
2ebda74f GC	198	MODULE_LICENSE("GPL");
2ebda74f GC	199	MODULE_DESCRIPTION("Asynchronous compression type");