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 <net/netlink.h>
24#include <crypto/internal/acompress.h>
25#include <crypto/internal/scompress.h>
26#include "internal.h"
27
28static const struct crypto_type crypto_acomp_type;
29
30#ifdef CONFIG_NET
31static 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
42nla_put_failure:
43 return -EMSGSIZE;
44}
45#else
46static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg)
47{
48 return -ENOSYS;
49}
50#endif
51
52static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
53 __attribute__ ((unused));
54
55static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
56{
57 seq_puts(m, "type : acomp\n");
58}
59
60static 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
68static 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
90static 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
100static 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
113struct 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}
118EXPORT_SYMBOL_GPL(crypto_alloc_acomp);
119
120struct 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}
131EXPORT_SYMBOL_GPL(acomp_request_alloc);
132
133void 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}
148EXPORT_SYMBOL_GPL(acomp_request_free);
149
150int 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}
160EXPORT_SYMBOL_GPL(crypto_register_acomp);
161
162int crypto_unregister_acomp(struct acomp_alg *alg)
163{
164 return crypto_unregister_alg(&alg->base);
165}
166EXPORT_SYMBOL_GPL(crypto_unregister_acomp);
167
168MODULE_LICENSE("GPL");
169MODULE_DESCRIPTION("Asynchronous compression type");