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
24 static const struct crypto_type crypto_acomp_type;
25
26 #ifdef CONFIG_NET
crypto_acomp_report(struct sk_buff * skb,struct crypto_alg * alg)27 static 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
crypto_acomp_report(struct sk_buff * skb,struct crypto_alg * alg)38 static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg)
39 {
40 return -ENOSYS;
41 }
42 #endif
43
44 static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
45 __maybe_unused;
46
crypto_acomp_show(struct seq_file * m,struct crypto_alg * alg)47 static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
48 {
49 seq_puts(m, "type : acomp\n");
50 }
51
crypto_acomp_exit_tfm(struct crypto_tfm * tfm)52 static 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
crypto_acomp_init_tfm(struct crypto_tfm * tfm)60 static 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
crypto_acomp_extsize(struct crypto_alg * alg)82 static 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
92 static 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
crypto_alloc_acomp(const char * alg_name,u32 type,u32 mask)105 struct 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 }
110 EXPORT_SYMBOL_GPL(crypto_alloc_acomp);
111
acomp_request_alloc(struct crypto_acomp * acomp)112 struct 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 }
123 EXPORT_SYMBOL_GPL(acomp_request_alloc);
124
acomp_request_free(struct acomp_req * req)125 void 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 }
140 EXPORT_SYMBOL_GPL(acomp_request_free);
141
crypto_register_acomp(struct acomp_alg * alg)142 int 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 }
152 EXPORT_SYMBOL_GPL(crypto_register_acomp);
153
crypto_unregister_acomp(struct acomp_alg * alg)154 int crypto_unregister_acomp(struct acomp_alg *alg)
155 {
156 return crypto_unregister_alg(&alg->base);
157 }
158 EXPORT_SYMBOL_GPL(crypto_unregister_acomp);
159
crypto_register_acomps(struct acomp_alg * algs,int count)160 int 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
172 err:
173 for (--i; i >= 0; --i)
174 crypto_unregister_acomp(&algs[i]);
175
176 return ret;
177 }
178 EXPORT_SYMBOL_GPL(crypto_register_acomps);
179
crypto_unregister_acomps(struct acomp_alg * algs,int count)180 void 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 }
187 EXPORT_SYMBOL_GPL(crypto_unregister_acomps);
188
189 MODULE_LICENSE("GPL");
190 MODULE_DESCRIPTION("Asynchronous compression type");
191