summaryrefslogtreecommitdiffstats
path: root/crypto/acompress.c
blob: 887783d8e9a926f98891f7b01d0223cf41a19fb0 (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
/*
 * 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 <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)
	__attribute__ ((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);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Asynchronous compression type");