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