xref: /openbmc/linux/crypto/acompress.c (revision b78412b8)
1 /*
2  * Asynchronous Compression operations
3  *
4  * Copyright (c) 2016, Intel Corporation
5  * Authors: Weigang Li <weigang.li@intel.com>
6  *          Giovanni Cabiddu <giovanni.cabiddu@intel.com>
7  *
8  * This program is free software; you can redistribute it and/or modify it
9  * under the terms of the GNU General Public License as published by the Free
10  * Software Foundation; either version 2 of the License, or (at your option)
11  * any later version.
12  *
13  */
14 #include <linux/errno.h>
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/seq_file.h>
18 #include <linux/slab.h>
19 #include <linux/string.h>
20 #include <linux/crypto.h>
21 #include <crypto/algapi.h>
22 #include <linux/cryptouser.h>
23 #include <linux/compiler.h>
24 #include <net/netlink.h>
25 #include <crypto/internal/acompress.h>
26 #include <crypto/internal/scompress.h>
27 #include "internal.h"
28 
29 static const struct crypto_type crypto_acomp_type;
30 
31 #ifdef CONFIG_NET
32 static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg)
33 {
34 	struct crypto_report_acomp racomp;
35 
36 	strncpy(racomp.type, "acomp", sizeof(racomp.type));
37 
38 	if (nla_put(skb, CRYPTOCFGA_REPORT_ACOMP,
39 		    sizeof(struct crypto_report_acomp), &racomp))
40 		goto nla_put_failure;
41 	return 0;
42 
43 nla_put_failure:
44 	return -EMSGSIZE;
45 }
46 #else
47 static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg)
48 {
49 	return -ENOSYS;
50 }
51 #endif
52 
53 static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
54 	__maybe_unused;
55 
56 static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
57 {
58 	seq_puts(m, "type         : acomp\n");
59 }
60 
61 static void crypto_acomp_exit_tfm(struct crypto_tfm *tfm)
62 {
63 	struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
64 	struct acomp_alg *alg = crypto_acomp_alg(acomp);
65 
66 	alg->exit(acomp);
67 }
68 
69 static int crypto_acomp_init_tfm(struct crypto_tfm *tfm)
70 {
71 	struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
72 	struct acomp_alg *alg = crypto_acomp_alg(acomp);
73 
74 	if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
75 		return crypto_init_scomp_ops_async(tfm);
76 
77 	acomp->compress = alg->compress;
78 	acomp->decompress = alg->decompress;
79 	acomp->dst_free = alg->dst_free;
80 	acomp->reqsize = alg->reqsize;
81 
82 	if (alg->exit)
83 		acomp->base.exit = crypto_acomp_exit_tfm;
84 
85 	if (alg->init)
86 		return alg->init(acomp);
87 
88 	return 0;
89 }
90 
91 static unsigned int crypto_acomp_extsize(struct crypto_alg *alg)
92 {
93 	int extsize = crypto_alg_extsize(alg);
94 
95 	if (alg->cra_type != &crypto_acomp_type)
96 		extsize += sizeof(struct crypto_scomp *);
97 
98 	return extsize;
99 }
100 
101 static const struct crypto_type crypto_acomp_type = {
102 	.extsize = crypto_acomp_extsize,
103 	.init_tfm = crypto_acomp_init_tfm,
104 #ifdef CONFIG_PROC_FS
105 	.show = crypto_acomp_show,
106 #endif
107 	.report = crypto_acomp_report,
108 	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
109 	.maskset = CRYPTO_ALG_TYPE_ACOMPRESS_MASK,
110 	.type = CRYPTO_ALG_TYPE_ACOMPRESS,
111 	.tfmsize = offsetof(struct crypto_acomp, base),
112 };
113 
114 struct crypto_acomp *crypto_alloc_acomp(const char *alg_name, u32 type,
115 					u32 mask)
116 {
117 	return crypto_alloc_tfm(alg_name, &crypto_acomp_type, type, mask);
118 }
119 EXPORT_SYMBOL_GPL(crypto_alloc_acomp);
120 
121 struct acomp_req *acomp_request_alloc(struct crypto_acomp *acomp)
122 {
123 	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
124 	struct acomp_req *req;
125 
126 	req = __acomp_request_alloc(acomp);
127 	if (req && (tfm->__crt_alg->cra_type != &crypto_acomp_type))
128 		return crypto_acomp_scomp_alloc_ctx(req);
129 
130 	return req;
131 }
132 EXPORT_SYMBOL_GPL(acomp_request_alloc);
133 
134 void acomp_request_free(struct acomp_req *req)
135 {
136 	struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
137 	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
138 
139 	if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
140 		crypto_acomp_scomp_free_ctx(req);
141 
142 	if (req->flags & CRYPTO_ACOMP_ALLOC_OUTPUT) {
143 		acomp->dst_free(req->dst);
144 		req->dst = NULL;
145 	}
146 
147 	__acomp_request_free(req);
148 }
149 EXPORT_SYMBOL_GPL(acomp_request_free);
150 
151 int crypto_register_acomp(struct acomp_alg *alg)
152 {
153 	struct crypto_alg *base = &alg->base;
154 
155 	base->cra_type = &crypto_acomp_type;
156 	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
157 	base->cra_flags |= CRYPTO_ALG_TYPE_ACOMPRESS;
158 
159 	return crypto_register_alg(base);
160 }
161 EXPORT_SYMBOL_GPL(crypto_register_acomp);
162 
163 int crypto_unregister_acomp(struct acomp_alg *alg)
164 {
165 	return crypto_unregister_alg(&alg->base);
166 }
167 EXPORT_SYMBOL_GPL(crypto_unregister_acomp);
168 
169 int crypto_register_acomps(struct acomp_alg *algs, int count)
170 {
171 	int i, ret;
172 
173 	for (i = 0; i < count; i++) {
174 		ret = crypto_register_acomp(&algs[i]);
175 		if (ret)
176 			goto err;
177 	}
178 
179 	return 0;
180 
181 err:
182 	for (--i; i >= 0; --i)
183 		crypto_unregister_acomp(&algs[i]);
184 
185 	return ret;
186 }
187 EXPORT_SYMBOL_GPL(crypto_register_acomps);
188 
189 void crypto_unregister_acomps(struct acomp_alg *algs, int count)
190 {
191 	int i;
192 
193 	for (i = count - 1; i >= 0; --i)
194 		crypto_unregister_acomp(&algs[i]);
195 }
196 EXPORT_SYMBOL_GPL(crypto_unregister_acomps);
197 
198 MODULE_LICENSE("GPL");
199 MODULE_DESCRIPTION("Asynchronous compression type");
200