summaryrefslogtreecommitdiff
path: root/crypto/zstd.c
blob: 5a3ff258d8f7530f632efcdf491afad38ac54b40 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Cryptographic API.
 *
 * Copyright (c) 2017-present, Facebook, Inc.
 */
#include <linux/crypto.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/net.h>
#include <linux/vmalloc.h>
#include <linux/zstd.h>
#include <crypto/internal/scompress.h>


#define ZSTD_DEF_LEVEL	3

struct zstd_ctx {
	ZSTD_CCtx *cctx;
	ZSTD_DCtx *dctx;
	void *cwksp;
	void *dwksp;
};

static ZSTD_parameters zstd_params(void)
{
	return ZSTD_getParams(ZSTD_DEF_LEVEL, 0, 0);
}

static int zstd_comp_init(struct zstd_ctx *ctx)
{
	int ret = 0;
	const ZSTD_parameters params = zstd_params();
	const size_t wksp_size = ZSTD_CCtxWorkspaceBound(params.cParams);

	ctx->cwksp = vzalloc(wksp_size);
	if (!ctx->cwksp) {
		ret = -ENOMEM;
		goto out;
	}

	ctx->cctx = ZSTD_initCCtx(ctx->cwksp, wksp_size);
	if (!ctx->cctx) {
		ret = -EINVAL;
		goto out_free;
	}
out:
	return ret;
out_free:
	vfree(ctx->cwksp);
	goto out;
}

static int zstd_decomp_init(struct zstd_ctx *ctx)
{
	int ret = 0;
	const size_t wksp_size = ZSTD_DCtxWorkspaceBound();

	ctx->dwksp = vzalloc(wksp_size);
	if (!ctx->dwksp) {
		ret = -ENOMEM;
		goto out;
	}

	ctx->dctx = ZSTD_initDCtx(ctx->dwksp, wksp_size);
	if (!ctx->dctx) {
		ret = -EINVAL;
		goto out_free;
	}
out:
	return ret;
out_free:
	vfree(ctx->dwksp);
	goto out;
}

static void zstd_comp_exit(struct zstd_ctx *ctx)
{
	vfree(ctx->cwksp);
	ctx->cwksp = NULL;
	ctx->cctx = NULL;
}

static void zstd_decomp_exit(struct zstd_ctx *ctx)
{
	vfree(ctx->dwksp);
	ctx->dwksp = NULL;
	ctx->dctx = NULL;
}

static int __zstd_init(void *ctx)
{
	int ret;

	ret = zstd_comp_init(ctx);
	if (ret)
		return ret;
	ret = zstd_decomp_init(ctx);
	if (ret)
		zstd_comp_exit(ctx);
	return ret;
}

static void *zstd_alloc_ctx(struct crypto_scomp *tfm)
{
	int ret;
	struct zstd_ctx *ctx;

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

	ret = __zstd_init(ctx);
	if (ret) {
		kfree(ctx);
		return ERR_PTR(ret);
	}

	return ctx;
}

static int zstd_init(struct crypto_tfm *tfm)
{
	struct zstd_ctx *ctx = crypto_tfm_ctx(tfm);

	return __zstd_init(ctx);
}

static void __zstd_exit(void *ctx)
{
	zstd_comp_exit(ctx);
	zstd_decomp_exit(ctx);
}

static void zstd_free_ctx(struct crypto_scomp *tfm, void *ctx)
{
	__zstd_exit(ctx);
	kzfree(ctx);
}

static void zstd_exit(struct crypto_tfm *tfm)
{
	struct zstd_ctx *ctx = crypto_tfm_ctx(tfm);

	__zstd_exit(ctx);
}

static int __zstd_compress(const u8 *src, unsigned int slen,
			   u8 *dst, unsigned int *dlen, void *ctx)
{
	size_t out_len;
	struct zstd_ctx *zctx = ctx;
	const ZSTD_parameters params = zstd_params();

	out_len = ZSTD_compressCCtx(zctx->cctx, dst, *dlen, src, slen, params);
	if (ZSTD_isError(out_len))
		return -EINVAL;
	*dlen = out_len;
	return 0;
}

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

	return __zstd_compress(src, slen, dst, dlen, ctx);
}

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

static int __zstd_decompress(const u8 *src, unsigned int slen,
			     u8 *dst, unsigned int *dlen, void *ctx)
{
	size_t out_len;
	struct zstd_ctx *zctx = ctx;

	out_len = ZSTD_decompressDCtx(zctx->dctx, dst, *dlen, src, slen);
	if (ZSTD_isError(out_len))
		return -EINVAL;
	*dlen = out_len;
	return 0;
}

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

	return __zstd_decompress(src, slen, dst, dlen, ctx);
}

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

static struct crypto_alg alg = {
	.cra_name		= "zstd",
	.cra_driver_name	= "zstd-generic",
	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
	.cra_ctxsize		= sizeof(struct zstd_ctx),
	.cra_module		= THIS_MODULE,
	.cra_init		= zstd_init,
	.cra_exit		= zstd_exit,
	.cra_u			= { .compress = {
	.coa_compress		= zstd_compress,
	.coa_decompress		= zstd_decompress } }
};

static struct scomp_alg scomp = {
	.alloc_ctx		= zstd_alloc_ctx,
	.free_ctx		= zstd_free_ctx,
	.compress		= zstd_scompress,
	.decompress		= zstd_sdecompress,
	.base			= {
		.cra_name	= "zstd",
		.cra_driver_name = "zstd-scomp",
		.cra_module	 = THIS_MODULE,
	}
};

static int __init zstd_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;
}

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

subsys_initcall(zstd_mod_init);
module_exit(zstd_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Zstd Compression Algorithm");
MODULE_ALIAS_CRYPTO("zstd");