[mirror_ubuntu-zesty-kernel.git] / crypto / lzo.c

/*
 * Cryptographic API.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 *
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/crypto.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/lzo.h>
#include <crypto/internal/scompress.h>

struct lzo_ctx {
	void *lzo_comp_mem;
};

static void *lzo_alloc_ctx(struct crypto_scomp *tfm)
{
	void *ctx;

	ctx = kmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL | __GFP_NOWARN);
	if (!ctx)
		ctx = vmalloc(LZO1X_MEM_COMPRESS);
	if (!ctx)
		return ERR_PTR(-ENOMEM);

	return ctx;
}

static int lzo_init(struct crypto_tfm *tfm)
{
	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);

	ctx->lzo_comp_mem = lzo_alloc_ctx(NULL);
	if (IS_ERR(ctx->lzo_comp_mem))
		return -ENOMEM;

	return 0;
}

static void lzo_free_ctx(struct crypto_scomp *tfm, void *ctx)
{
	kvfree(ctx);
}

static void lzo_exit(struct crypto_tfm *tfm)
{
	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);

	lzo_free_ctx(NULL, ctx->lzo_comp_mem);
}

static int __lzo_compress(const u8 *src, unsigned int slen,
			  u8 *dst, unsigned int *dlen, void *ctx)
{
	size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
	int err;

	err = lzo1x_1_compress(src, slen, dst, &tmp_len, ctx);

	if (err != LZO_E_OK)
		return -EINVAL;

	*dlen = tmp_len;
	return 0;
}

static int lzo_compress(struct crypto_tfm *tfm, const u8 *src,
			unsigned int slen, u8 *dst, unsigned int *dlen)
{
	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);

	return __lzo_compress(src, slen, dst, dlen, ctx->lzo_comp_mem);
}

static int lzo_scompress(struct crypto_scomp *tfm, const u8 *src,
			 unsigned int slen, u8 *dst, unsigned int *dlen,
			 void *ctx)
{
	return __lzo_compress(src, slen, dst, dlen, ctx);
}

static int __lzo_decompress(const u8 *src, unsigned int slen,
			    u8 *dst, unsigned int *dlen)
{
	int err;
	size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */

	err = lzo1x_decompress_safe(src, slen, dst, &tmp_len);

	if (err != LZO_E_OK)
		return -EINVAL;

	*dlen = tmp_len;
	return 0;
}

static int lzo_decompress(struct crypto_tfm *tfm, const u8 *src,
			  unsigned int slen, u8 *dst, unsigned int *dlen)
{
	return __lzo_decompress(src, slen, dst, dlen);
}

static int lzo_sdecompress(struct crypto_scomp *tfm, const u8 *src,
			   unsigned int slen, u8 *dst, unsigned int *dlen,
			   void *ctx)
{
	return __lzo_decompress(src, slen, dst, dlen);
}

static struct crypto_alg alg = {
	.cra_name		= "lzo",
	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
	.cra_ctxsize		= sizeof(struct lzo_ctx),
	.cra_module		= THIS_MODULE,
	.cra_init		= lzo_init,
	.cra_exit		= lzo_exit,
	.cra_u			= { .compress = {
	.coa_compress		= lzo_compress,
	.coa_decompress		= lzo_decompress } }
};

static struct scomp_alg scomp = {
	.alloc_ctx		= lzo_alloc_ctx,
	.free_ctx		= lzo_free_ctx,
	.compress		= lzo_scompress,
	.decompress		= lzo_sdecompress,
	.base			= {
		.cra_name	= "lzo",
		.cra_driver_name = "lzo-scomp",
		.cra_module	 = THIS_MODULE,
	}
};

static int __init lzo_mod_init(void)
{
	int ret;

	ret = crypto_register_alg(&alg);
	if (ret)
		return ret;

	ret = crypto_register_scomp(&scomp);
	if (ret) {
		crypto_unregister_alg(&alg);
		return ret;
	}

	return ret;
}

static void __exit lzo_mod_fini(void)
{
	crypto_unregister_alg(&alg);
	crypto_unregister_scomp(&scomp);
}

module_init(lzo_mod_init);
module_exit(lzo_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("LZO Compression Algorithm");
MODULE_ALIAS_CRYPTO("lzo");
Commit	Line	Data
0b77abb3 ZS	1	/*
	2	* Cryptographic API.
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms of the GNU General Public License version 2 as published by
	6	* the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	11	* more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along with
	14	* this program; if not, write to the Free Software Foundation, Inc., 51
	15	* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	16	*
	17	*/
	18
	19	#include <linux/init.h>
	20	#include <linux/module.h>
	21	#include <linux/crypto.h>
	22	#include <linux/vmalloc.h>
42614b05	23	#include <linux/mm.h>
0b77abb3	24	#include <linux/lzo.h>
ac9d2c4b	25	#include <crypto/internal/scompress.h>
0b77abb3 ZS	26
	27	struct lzo_ctx {
	28	void *lzo_comp_mem;
	29	};
	30
ac9d2c4b GC	31	static void lzo_alloc_ctx(struct crypto_scomp tfm)
	32	{
	33	void *ctx;
	34
	35	ctx = kmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL \| __GFP_NOWARN);
	36	if (!ctx)
	37	ctx = vmalloc(LZO1X_MEM_COMPRESS);
	38	if (!ctx)
	39	return ERR_PTR(-ENOMEM);
	40
	41	return ctx;
	42	}
	43
0b77abb3 ZS	44	static int lzo_init(struct crypto_tfm *tfm)
	45	{
	46	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
	47
ac9d2c4b GC	48	ctx->lzo_comp_mem = lzo_alloc_ctx(NULL);
ac9d2c4b GC	49	if (IS_ERR(ctx->lzo_comp_mem))
0b77abb3 ZS	50	return -ENOMEM;
	51
	52	return 0;
	53	}
	54
ac9d2c4b GC	55	static void lzo_free_ctx(struct crypto_scomp tfm, void ctx)
	56	{
	57	kvfree(ctx);
	58	}
	59
0b77abb3 ZS	60	static void lzo_exit(struct crypto_tfm *tfm)
	61	{
	62	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
	63
ac9d2c4b	64	lzo_free_ctx(NULL, ctx->lzo_comp_mem);
0b77abb3 ZS	65	}
0b77abb3 ZS	66
ac9d2c4b GC	67	static int __lzo_compress(const u8 *src, unsigned int slen,
ac9d2c4b GC	68	u8 dst, unsigned int dlen, void *ctx)
0b77abb3	69	{
0b77abb3 ZS	70	size_t tmp_len = dlen; / size_t(ulong) <-> uint on 64 bit */
	71	int err;
	72
ac9d2c4b	73	err = lzo1x_1_compress(src, slen, dst, &tmp_len, ctx);
0b77abb3 ZS	74
	75	if (err != LZO_E_OK)
	76	return -EINVAL;
	77
	78	*dlen = tmp_len;
	79	return 0;
	80	}
	81
ac9d2c4b GC	82	static int lzo_compress(struct crypto_tfm tfm, const u8 src,
	83	unsigned int slen, u8 dst, unsigned int dlen)
	84	{
	85	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
	86
	87	return __lzo_compress(src, slen, dst, dlen, ctx->lzo_comp_mem);
	88	}
	89
	90	static int lzo_scompress(struct crypto_scomp tfm, const u8 src,
	91	unsigned int slen, u8 dst, unsigned int dlen,
	92	void *ctx)
	93	{
	94	return __lzo_compress(src, slen, dst, dlen, ctx);
	95	}
	96
	97	static int __lzo_decompress(const u8 *src, unsigned int slen,
	98	u8 dst, unsigned int dlen)
0b77abb3 ZS	99	{
	100	int err;
	101	size_t tmp_len = dlen; / size_t(ulong) <-> uint on 64 bit */
	102
	103	err = lzo1x_decompress_safe(src, slen, dst, &tmp_len);
	104
	105	if (err != LZO_E_OK)
	106	return -EINVAL;
	107
	108	*dlen = tmp_len;
	109	return 0;
ac9d2c4b	110	}
0b77abb3	111
ac9d2c4b GC	112	static int lzo_decompress(struct crypto_tfm tfm, const u8 src,
	113	unsigned int slen, u8 dst, unsigned int dlen)
	114	{
	115	return __lzo_decompress(src, slen, dst, dlen);
	116	}
	117
	118	static int lzo_sdecompress(struct crypto_scomp tfm, const u8 src,
	119	unsigned int slen, u8 dst, unsigned int dlen,
	120	void *ctx)
	121	{
	122	return __lzo_decompress(src, slen, dst, dlen);
0b77abb3 ZS	123	}
	124
	125	static struct crypto_alg alg = {
	126	.cra_name = "lzo",
	127	.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
	128	.cra_ctxsize = sizeof(struct lzo_ctx),
	129	.cra_module = THIS_MODULE,
0b77abb3 ZS	130	.cra_init = lzo_init,
	131	.cra_exit = lzo_exit,
	132	.cra_u = { .compress = {
ac9d2c4b GC	133	.coa_compress = lzo_compress,
	134	.coa_decompress = lzo_decompress } }
	135	};
	136
	137	static struct scomp_alg scomp = {
	138	.alloc_ctx = lzo_alloc_ctx,
	139	.free_ctx = lzo_free_ctx,
	140	.compress = lzo_scompress,
	141	.decompress = lzo_sdecompress,
	142	.base = {
	143	.cra_name = "lzo",
	144	.cra_driver_name = "lzo-scomp",
	145	.cra_module = THIS_MODULE,
	146	}
0b77abb3 ZS	147	};
0b77abb3 ZS	148
3af5b90b	149	static int __init lzo_mod_init(void)
0b77abb3	150	{
ac9d2c4b GC	151	int ret;
	152
	153	ret = crypto_register_alg(&alg);
	154	if (ret)
	155	return ret;
	156
	157	ret = crypto_register_scomp(&scomp);
	158	if (ret) {
	159	crypto_unregister_alg(&alg);
	160	return ret;
	161	}
	162
	163	return ret;
0b77abb3 ZS	164	}
0b77abb3 ZS	165
3af5b90b	166	static void __exit lzo_mod_fini(void)
0b77abb3 ZS	167	{
0b77abb3 ZS	168	crypto_unregister_alg(&alg);
ac9d2c4b	169	crypto_unregister_scomp(&scomp);
0b77abb3 ZS	170	}
0b77abb3 ZS	171
3af5b90b KB	172	module_init(lzo_mod_init);
3af5b90b KB	173	module_exit(lzo_mod_fini);
0b77abb3 ZS	174
	175	MODULE_LICENSE("GPL");
	176	MODULE_DESCRIPTION("LZO Compression Algorithm");
5d26a105	177	MODULE_ALIAS_CRYPTO("lzo");