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
10 #include <crypto/internal/acompress.h>
11 #include <linux/cryptouser.h>
12 #include <linux/errno.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/seq_file.h>
16 #include <linux/slab.h>
17 #include <linux/string.h>
18 #include <net/netlink.h>
19
20 #include "compress.h"
21
22 struct crypto_scomp;
23
24 static const struct crypto_type crypto_acomp_type;
25
26 static inline struct acomp_alg *__crypto_acomp_alg(struct crypto_alg *alg)
27 {
28 return container_of(alg, struct acomp_alg, calg.base);
29 }
30
31 static inline struct acomp_alg *crypto_acomp_alg(struct crypto_acomp *tfm)
32 {
33 return __crypto_acomp_alg(crypto_acomp_tfm(tfm)->__crt_alg);
34 }
35
36 static int __maybe_unused crypto_acomp_report(
37 struct sk_buff *skb, struct crypto_alg *alg)
38 {
39 struct crypto_report_acomp racomp;
40
41 memset(&racomp, 0, sizeof(racomp));
42
43 strscpy(racomp.type, "acomp", sizeof(racomp.type));
44
45 return nla_put(skb, CRYPTOCFGA_REPORT_ACOMP, sizeof(racomp), &racomp);
46 }
47
48 static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
49 __maybe_unused;
50
51 static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
52 {
53 seq_puts(m, "type : acomp\n");
54 }
55
56 static void crypto_acomp_exit_tfm(struct crypto_tfm *tfm)
57 {
58 struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
59 struct acomp_alg *alg = crypto_acomp_alg(acomp);
60
61 alg->exit(acomp);
62 }
63
64 static int crypto_acomp_init_tfm(struct crypto_tfm *tfm)
65 {
66 struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
67 struct acomp_alg *alg = crypto_acomp_alg(acomp);
68
69 if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
70 return crypto_init_scomp_ops_async(tfm);
71
72 acomp->compress = alg->compress;
73 acomp->decompress = alg->decompress;
74 acomp->dst_free = alg->dst_free;
75 acomp->reqsize = alg->reqsize;
76
77 if (alg->exit)
78 acomp->base.exit = crypto_acomp_exit_tfm;
79
80 if (alg->init)
81 return alg->init(acomp);
82
83 return 0;
84 }
85
86 static unsigned int crypto_acomp_extsize(struct crypto_alg *alg)
87 {
88 int extsize = crypto_alg_extsize(alg);
89
90 if (alg->cra_type != &crypto_acomp_type)
91 extsize += sizeof(struct crypto_scomp *);
92
93 return extsize;
94 }
95
96 static const struct crypto_type crypto_acomp_type = {
97 .extsize = crypto_acomp_extsize,
98 .init_tfm = crypto_acomp_init_tfm,
99 #ifdef CONFIG_PROC_FS
100 .show = crypto_acomp_show,
101 #endif
102 #if IS_ENABLED(CONFIG_CRYPTO_USER)
103 .report = crypto_acomp_report,
104 #endif
105 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
106 .maskset = CRYPTO_ALG_TYPE_ACOMPRESS_MASK,
107 .type = CRYPTO_ALG_TYPE_ACOMPRESS,
108 .tfmsize = offsetof(struct crypto_acomp, base),
109 };
110
111 struct crypto_acomp *crypto_alloc_acomp(const char *alg_name, u32 type,
112 u32 mask)
113 {
114 return crypto_alloc_tfm(alg_name, &crypto_acomp_type, type, mask);
115 }
116 EXPORT_SYMBOL_GPL(crypto_alloc_acomp);
117
118 struct crypto_acomp *crypto_alloc_acomp_node(const char *alg_name, u32 type,
119 u32 mask, int node)
120 {
121 return crypto_alloc_tfm_node(alg_name, &crypto_acomp_type, type, mask,
122 node);
123 }
124 EXPORT_SYMBOL_GPL(crypto_alloc_acomp_node);
125
126 struct acomp_req *acomp_request_alloc(struct crypto_acomp *acomp)
127 {
128 struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
129 struct acomp_req *req;
130
131 req = __acomp_request_alloc(acomp);
132 if (req && (tfm->__crt_alg->cra_type != &crypto_acomp_type))
133 return crypto_acomp_scomp_alloc_ctx(req);
134
135 return req;
136 }
137 EXPORT_SYMBOL_GPL(acomp_request_alloc);
138
139 void acomp_request_free(struct acomp_req *req)
140 {
141 struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
142 struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
143
144 if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
145 crypto_acomp_scomp_free_ctx(req);
146
147 if (req->flags & CRYPTO_ACOMP_ALLOC_OUTPUT) {
148 acomp->dst_free(req->dst);
149 req->dst = NULL;
150 }
151
152 __acomp_request_free(req);
153 }
154 EXPORT_SYMBOL_GPL(acomp_request_free);
155
156 void comp_prepare_alg(struct comp_alg_common *alg)
157 {
158 struct crypto_alg *base = &alg->base;
159
160 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
161 }
162
163 int crypto_register_acomp(struct acomp_alg *alg)
164 {
165 struct crypto_alg *base = &alg->calg.base;
166
167 comp_prepare_alg(&alg->calg);
168
169 base->cra_type = &crypto_acomp_type;
170 base->cra_flags |= CRYPTO_ALG_TYPE_ACOMPRESS;
171
172 return crypto_register_alg(base);
173 }
174 EXPORT_SYMBOL_GPL(crypto_register_acomp);
175
176 void crypto_unregister_acomp(struct acomp_alg *alg)
177 {
178 crypto_unregister_alg(&alg->base);
179 }
180 EXPORT_SYMBOL_GPL(crypto_unregister_acomp);
181
182 int crypto_register_acomps(struct acomp_alg *algs, int count)
183 {
184 int i, ret;
185
186 for (i = 0; i < count; i++) {
187 ret = crypto_register_acomp(&algs[i]);
188 if (ret)
189 goto err;
190 }
191
192 return 0;
193
194 err:
195 for (--i; i >= 0; --i)
196 crypto_unregister_acomp(&algs[i]);
197
198 return ret;
199 }
200 EXPORT_SYMBOL_GPL(crypto_register_acomps);
201
202 void crypto_unregister_acomps(struct acomp_alg *algs, int count)
203 {
204 int i;
205
206 for (i = count - 1; i >= 0; --i)
207 crypto_unregister_acomp(&algs[i]);
208 }
209 EXPORT_SYMBOL_GPL(crypto_unregister_acomps);
210
211 MODULE_LICENSE("GPL");
212 MODULE_DESCRIPTION("Asynchronous compression type");
213
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