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
10#include <crypto/internal/acompress.h>
11#include <linux/cryptouser.h>
12#include <linux/errno.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/seq_file.h>
16#include <linux/slab.h>
17#include <linux/string.h>
18#include <net/netlink.h>
19
20#include "compress.h"
21
22struct crypto_scomp;
23
24static const struct crypto_type crypto_acomp_type;
25
26static inline struct acomp_alg *__crypto_acomp_alg(struct crypto_alg *alg)
27{
28	return container_of(alg, struct acomp_alg, calg.base);
29}
30
31static inline struct acomp_alg *crypto_acomp_alg(struct crypto_acomp *tfm)
32{
33	return __crypto_acomp_alg(crypto_acomp_tfm(tfm)->__crt_alg);
34}
35
36static int __maybe_unused crypto_acomp_report(
37	struct sk_buff *skb, struct crypto_alg *alg)
38{
39	struct crypto_report_acomp racomp;
40
41	memset(&racomp, 0, sizeof(racomp));
42
43	strscpy(racomp.type, "acomp", sizeof(racomp.type));
44
45	return nla_put(skb, CRYPTOCFGA_REPORT_ACOMP, sizeof(racomp), &racomp);
46}
47
48static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
49	__maybe_unused;
50
51static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
52{
53	seq_puts(m, "type         : acomp\n");
54}
55
56static void crypto_acomp_exit_tfm(struct crypto_tfm *tfm)
57{
58	struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
59	struct acomp_alg *alg = crypto_acomp_alg(acomp);
60
61	alg->exit(acomp);
62}
63
64static int crypto_acomp_init_tfm(struct crypto_tfm *tfm)
65{
66	struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
67	struct acomp_alg *alg = crypto_acomp_alg(acomp);
68
69	if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
70		return crypto_init_scomp_ops_async(tfm);
71
72	acomp->compress = alg->compress;
73	acomp->decompress = alg->decompress;
74	acomp->dst_free = alg->dst_free;
75	acomp->reqsize = alg->reqsize;
76
77	if (alg->exit)
78		acomp->base.exit = crypto_acomp_exit_tfm;
79
80	if (alg->init)
81		return alg->init(acomp);
82
83	return 0;
84}
85
86static unsigned int crypto_acomp_extsize(struct crypto_alg *alg)
87{
88	int extsize = crypto_alg_extsize(alg);
89
90	if (alg->cra_type != &crypto_acomp_type)
91		extsize += sizeof(struct crypto_scomp *);
92
93	return extsize;
94}
95
96static const struct crypto_type crypto_acomp_type = {
97	.extsize = crypto_acomp_extsize,
98	.init_tfm = crypto_acomp_init_tfm,
99#ifdef CONFIG_PROC_FS
100	.show = crypto_acomp_show,
101#endif
102#if IS_ENABLED(CONFIG_CRYPTO_USER)
103	.report = crypto_acomp_report,
104#endif
105	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
106	.maskset = CRYPTO_ALG_TYPE_ACOMPRESS_MASK,
107	.type = CRYPTO_ALG_TYPE_ACOMPRESS,
108	.tfmsize = offsetof(struct crypto_acomp, base),
109};
110
111struct crypto_acomp *crypto_alloc_acomp(const char *alg_name, u32 type,
112					u32 mask)
113{
114	return crypto_alloc_tfm(alg_name, &crypto_acomp_type, type, mask);
115}
116EXPORT_SYMBOL_GPL(crypto_alloc_acomp);
117
118struct crypto_acomp *crypto_alloc_acomp_node(const char *alg_name, u32 type,
119					u32 mask, int node)
120{
121	return crypto_alloc_tfm_node(alg_name, &crypto_acomp_type, type, mask,
122				node);
123}
124EXPORT_SYMBOL_GPL(crypto_alloc_acomp_node);
125
126struct acomp_req *acomp_request_alloc(struct crypto_acomp *acomp)
127{
128	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
129	struct acomp_req *req;
130
131	req = __acomp_request_alloc(acomp);
132	if (req && (tfm->__crt_alg->cra_type != &crypto_acomp_type))
133		return crypto_acomp_scomp_alloc_ctx(req);
134
135	return req;
136}
137EXPORT_SYMBOL_GPL(acomp_request_alloc);
138
139void acomp_request_free(struct acomp_req *req)
140{
141	struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
142	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
143
144	if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
145		crypto_acomp_scomp_free_ctx(req);
146
147	if (req->flags & CRYPTO_ACOMP_ALLOC_OUTPUT) {
148		acomp->dst_free(req->dst);
149		req->dst = NULL;
150	}
151
152	__acomp_request_free(req);
153}
154EXPORT_SYMBOL_GPL(acomp_request_free);
155
156void comp_prepare_alg(struct comp_alg_common *alg)
157{
158	struct crypto_alg *base = &alg->base;
159
160	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
161}
162
163int crypto_register_acomp(struct acomp_alg *alg)
164{
165	struct crypto_alg *base = &alg->calg.base;
166
167	comp_prepare_alg(&alg->calg);
168
169	base->cra_type = &crypto_acomp_type;
170	base->cra_flags |= CRYPTO_ALG_TYPE_ACOMPRESS;
171
172	return crypto_register_alg(base);
173}
174EXPORT_SYMBOL_GPL(crypto_register_acomp);
175
176void crypto_unregister_acomp(struct acomp_alg *alg)
177{
178	crypto_unregister_alg(&alg->base);
179}
180EXPORT_SYMBOL_GPL(crypto_unregister_acomp);
181
182int crypto_register_acomps(struct acomp_alg *algs, int count)
183{
184	int i, ret;
185
186	for (i = 0; i < count; i++) {
187		ret = crypto_register_acomp(&algs[i]);
188		if (ret)
189			goto err;
190	}
191
192	return 0;
193
194err:
195	for (--i; i >= 0; --i)
196		crypto_unregister_acomp(&algs[i]);
197
198	return ret;
199}
200EXPORT_SYMBOL_GPL(crypto_register_acomps);
201
202void crypto_unregister_acomps(struct acomp_alg *algs, int count)
203{
204	int i;
205
206	for (i = count - 1; i >= 0; --i)
207		crypto_unregister_acomp(&algs[i]);
208}
209EXPORT_SYMBOL_GPL(crypto_unregister_acomps);
210
211MODULE_LICENSE("GPL");
212MODULE_DESCRIPTION("Asynchronous compression type");
213