xref: /openbmc/linux/crypto/acompress.c (revision ae3473231e77a3f1909d48cd144cebe5e1d049b3)
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 <net/netlink.h>
24 #include <crypto/internal/acompress.h>
25 #include <crypto/internal/scompress.h>
26 #include "internal.h"
27 
28 static const struct crypto_type crypto_acomp_type;
29 
30 #ifdef CONFIG_NET
31 static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg)
32 {
33 	struct crypto_report_acomp racomp;
34 
35 	strncpy(racomp.type, "acomp", sizeof(racomp.type));
36 
37 	if (nla_put(skb, CRYPTOCFGA_REPORT_ACOMP,
38 		    sizeof(struct crypto_report_acomp), &racomp))
39 		goto nla_put_failure;
40 	return 0;
41 
42 nla_put_failure:
43 	return -EMSGSIZE;
44 }
45 #else
46 static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg)
47 {
48 	return -ENOSYS;
49 }
50 #endif
51 
52 static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
53 	__attribute__ ((unused));
54 
55 static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
56 {
57 	seq_puts(m, "type         : acomp\n");
58 }
59 
60 static void crypto_acomp_exit_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 	alg->exit(acomp);
66 }
67 
68 static int crypto_acomp_init_tfm(struct crypto_tfm *tfm)
69 {
70 	struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
71 	struct acomp_alg *alg = crypto_acomp_alg(acomp);
72 
73 	if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
74 		return crypto_init_scomp_ops_async(tfm);
75 
76 	acomp->compress = alg->compress;
77 	acomp->decompress = alg->decompress;
78 	acomp->dst_free = alg->dst_free;
79 	acomp->reqsize = alg->reqsize;
80 
81 	if (alg->exit)
82 		acomp->base.exit = crypto_acomp_exit_tfm;
83 
84 	if (alg->init)
85 		return alg->init(acomp);
86 
87 	return 0;
88 }
89 
90 static unsigned int crypto_acomp_extsize(struct crypto_alg *alg)
91 {
92 	int extsize = crypto_alg_extsize(alg);
93 
94 	if (alg->cra_type != &crypto_acomp_type)
95 		extsize += sizeof(struct crypto_scomp *);
96 
97 	return extsize;
98 }
99 
100 static const struct crypto_type crypto_acomp_type = {
101 	.extsize = crypto_acomp_extsize,
102 	.init_tfm = crypto_acomp_init_tfm,
103 #ifdef CONFIG_PROC_FS
104 	.show = crypto_acomp_show,
105 #endif
106 	.report = crypto_acomp_report,
107 	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
108 	.maskset = CRYPTO_ALG_TYPE_ACOMPRESS_MASK,
109 	.type = CRYPTO_ALG_TYPE_ACOMPRESS,
110 	.tfmsize = offsetof(struct crypto_acomp, base),
111 };
112 
113 struct crypto_acomp *crypto_alloc_acomp(const char *alg_name, u32 type,
114 					u32 mask)
115 {
116 	return crypto_alloc_tfm(alg_name, &crypto_acomp_type, type, mask);
117 }
118 EXPORT_SYMBOL_GPL(crypto_alloc_acomp);
119 
120 struct acomp_req *acomp_request_alloc(struct crypto_acomp *acomp)
121 {
122 	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
123 	struct acomp_req *req;
124 
125 	req = __acomp_request_alloc(acomp);
126 	if (req && (tfm->__crt_alg->cra_type != &crypto_acomp_type))
127 		return crypto_acomp_scomp_alloc_ctx(req);
128 
129 	return req;
130 }
131 EXPORT_SYMBOL_GPL(acomp_request_alloc);
132 
133 void acomp_request_free(struct acomp_req *req)
134 {
135 	struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
136 	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
137 
138 	if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
139 		crypto_acomp_scomp_free_ctx(req);
140 
141 	if (req->flags & CRYPTO_ACOMP_ALLOC_OUTPUT) {
142 		acomp->dst_free(req->dst);
143 		req->dst = NULL;
144 	}
145 
146 	__acomp_request_free(req);
147 }
148 EXPORT_SYMBOL_GPL(acomp_request_free);
149 
150 int crypto_register_acomp(struct acomp_alg *alg)
151 {
152 	struct crypto_alg *base = &alg->base;
153 
154 	base->cra_type = &crypto_acomp_type;
155 	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
156 	base->cra_flags |= CRYPTO_ALG_TYPE_ACOMPRESS;
157 
158 	return crypto_register_alg(base);
159 }
160 EXPORT_SYMBOL_GPL(crypto_register_acomp);
161 
162 int crypto_unregister_acomp(struct acomp_alg *alg)
163 {
164 	return crypto_unregister_alg(&alg->base);
165 }
166 EXPORT_SYMBOL_GPL(crypto_unregister_acomp);
167 
168 MODULE_LICENSE("GPL");
169 MODULE_DESCRIPTION("Asynchronous compression type");
170