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Linux kernel mirror (for testing)
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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Asynchronous Compression operations
4 *
5 * Copyright (c) 2016, Intel Corporation
6 * Authors: Weigang Li <weigang.li@intel.com>
7 * Giovanni Cabiddu <giovanni.cabiddu@intel.com>
8 */
9#include <linux/errno.h>
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/seq_file.h>
13#include <linux/slab.h>
14#include <linux/string.h>
15#include <linux/crypto.h>
16#include <crypto/algapi.h>
17#include <linux/cryptouser.h>
18#include <linux/compiler.h>
19#include <net/netlink.h>
20#include <crypto/internal/acompress.h>
21#include <crypto/internal/scompress.h>
22#include "internal.h"
23
24static const struct crypto_type crypto_acomp_type;
25
26#ifdef CONFIG_NET
27static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg)
28{
29 struct crypto_report_acomp racomp;
30
31 memset(&racomp, 0, sizeof(racomp));
32
33 strscpy(racomp.type, "acomp", sizeof(racomp.type));
34
35 return nla_put(skb, CRYPTOCFGA_REPORT_ACOMP, sizeof(racomp), &racomp);
36}
37#else
38static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg)
39{
40 return -ENOSYS;
41}
42#endif
43
44static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
45 __maybe_unused;
46
47static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
48{
49 seq_puts(m, "type : acomp\n");
50}
51
52static void crypto_acomp_exit_tfm(struct crypto_tfm *tfm)
53{
54 struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
55 struct acomp_alg *alg = crypto_acomp_alg(acomp);
56
57 alg->exit(acomp);
58}
59
60static int crypto_acomp_init_tfm(struct crypto_tfm *tfm)
61{
62 struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
63 struct acomp_alg *alg = crypto_acomp_alg(acomp);
64
65 if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
66 return crypto_init_scomp_ops_async(tfm);
67
68 acomp->compress = alg->compress;
69 acomp->decompress = alg->decompress;
70 acomp->dst_free = alg->dst_free;
71 acomp->reqsize = alg->reqsize;
72
73 if (alg->exit)
74 acomp->base.exit = crypto_acomp_exit_tfm;
75
76 if (alg->init)
77 return alg->init(acomp);
78
79 return 0;
80}
81
82static unsigned int crypto_acomp_extsize(struct crypto_alg *alg)
83{
84 int extsize = crypto_alg_extsize(alg);
85
86 if (alg->cra_type != &crypto_acomp_type)
87 extsize += sizeof(struct crypto_scomp *);
88
89 return extsize;
90}
91
92static const struct crypto_type crypto_acomp_type = {
93 .extsize = crypto_acomp_extsize,
94 .init_tfm = crypto_acomp_init_tfm,
95#ifdef CONFIG_PROC_FS
96 .show = crypto_acomp_show,
97#endif
98 .report = crypto_acomp_report,
99 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
100 .maskset = CRYPTO_ALG_TYPE_ACOMPRESS_MASK,
101 .type = CRYPTO_ALG_TYPE_ACOMPRESS,
102 .tfmsize = offsetof(struct crypto_acomp, base),
103};
104
105struct crypto_acomp *crypto_alloc_acomp(const char *alg_name, u32 type,
106 u32 mask)
107{
108 return crypto_alloc_tfm(alg_name, &crypto_acomp_type, type, mask);
109}
110EXPORT_SYMBOL_GPL(crypto_alloc_acomp);
111
112struct acomp_req *acomp_request_alloc(struct crypto_acomp *acomp)
113{
114 struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
115 struct acomp_req *req;
116
117 req = __acomp_request_alloc(acomp);
118 if (req && (tfm->__crt_alg->cra_type != &crypto_acomp_type))
119 return crypto_acomp_scomp_alloc_ctx(req);
120
121 return req;
122}
123EXPORT_SYMBOL_GPL(acomp_request_alloc);
124
125void acomp_request_free(struct acomp_req *req)
126{
127 struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
128 struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
129
130 if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
131 crypto_acomp_scomp_free_ctx(req);
132
133 if (req->flags & CRYPTO_ACOMP_ALLOC_OUTPUT) {
134 acomp->dst_free(req->dst);
135 req->dst = NULL;
136 }
137
138 __acomp_request_free(req);
139}
140EXPORT_SYMBOL_GPL(acomp_request_free);
141
142int crypto_register_acomp(struct acomp_alg *alg)
143{
144 struct crypto_alg *base = &alg->base;
145
146 base->cra_type = &crypto_acomp_type;
147 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
148 base->cra_flags |= CRYPTO_ALG_TYPE_ACOMPRESS;
149
150 return crypto_register_alg(base);
151}
152EXPORT_SYMBOL_GPL(crypto_register_acomp);
153
154int crypto_unregister_acomp(struct acomp_alg *alg)
155{
156 return crypto_unregister_alg(&alg->base);
157}
158EXPORT_SYMBOL_GPL(crypto_unregister_acomp);
159
160int crypto_register_acomps(struct acomp_alg *algs, int count)
161{
162 int i, ret;
163
164 for (i = 0; i < count; i++) {
165 ret = crypto_register_acomp(&algs[i]);
166 if (ret)
167 goto err;
168 }
169
170 return 0;
171
172err:
173 for (--i; i >= 0; --i)
174 crypto_unregister_acomp(&algs[i]);
175
176 return ret;
177}
178EXPORT_SYMBOL_GPL(crypto_register_acomps);
179
180void crypto_unregister_acomps(struct acomp_alg *algs, int count)
181{
182 int i;
183
184 for (i = count - 1; i >= 0; --i)
185 crypto_unregister_acomp(&algs[i]);
186}
187EXPORT_SYMBOL_GPL(crypto_unregister_acomps);
188
189MODULE_LICENSE("GPL");
190MODULE_DESCRIPTION("Asynchronous compression type");