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 #include <linux/errno.h>
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/seq_file.h>
13 #include <linux/slab.h>
14 #include <linux/string.h>
15 #include <linux/crypto.h>
16 #include <crypto/algapi.h>
17 #include <linux/cryptouser.h>
18 #include <linux/compiler.h>
19 #include <net/netlink.h>
20 #include <crypto/internal/acompress.h>
21 #include <crypto/internal/scompress.h>
22 #include "internal.h"
23 
24 static const struct crypto_type crypto_acomp_type;
25 
26 #ifdef CONFIG_NET
crypto_acomp_report(struct sk_buff * skb,struct crypto_alg * alg)27 static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg)
28 {
29 	struct crypto_report_acomp racomp;
30 
31 	memset(&racomp, 0, sizeof(racomp));
32 
33 	strscpy(racomp.type, "acomp", sizeof(racomp.type));
34 
35 	return nla_put(skb, CRYPTOCFGA_REPORT_ACOMP, sizeof(racomp), &racomp);
36 }
37 #else
crypto_acomp_report(struct sk_buff * skb,struct crypto_alg * alg)38 static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg)
39 {
40 	return -ENOSYS;
41 }
42 #endif
43 
44 static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
45 	__maybe_unused;
46 
crypto_acomp_show(struct seq_file * m,struct crypto_alg * alg)47 static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
48 {
49 	seq_puts(m, "type         : acomp\n");
50 }
51 
crypto_acomp_exit_tfm(struct crypto_tfm * tfm)52 static void crypto_acomp_exit_tfm(struct crypto_tfm *tfm)
53 {
54 	struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
55 	struct acomp_alg *alg = crypto_acomp_alg(acomp);
56 
57 	alg->exit(acomp);
58 }
59 
crypto_acomp_init_tfm(struct crypto_tfm * tfm)60 static int crypto_acomp_init_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 	if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
66 		return crypto_init_scomp_ops_async(tfm);
67 
68 	acomp->compress = alg->compress;
69 	acomp->decompress = alg->decompress;
70 	acomp->dst_free = alg->dst_free;
71 	acomp->reqsize = alg->reqsize;
72 
73 	if (alg->exit)
74 		acomp->base.exit = crypto_acomp_exit_tfm;
75 
76 	if (alg->init)
77 		return alg->init(acomp);
78 
79 	return 0;
80 }
81 
crypto_acomp_extsize(struct crypto_alg * alg)82 static unsigned int crypto_acomp_extsize(struct crypto_alg *alg)
83 {
84 	int extsize = crypto_alg_extsize(alg);
85 
86 	if (alg->cra_type != &crypto_acomp_type)
87 		extsize += sizeof(struct crypto_scomp *);
88 
89 	return extsize;
90 }
91 
92 static const struct crypto_type crypto_acomp_type = {
93 	.extsize = crypto_acomp_extsize,
94 	.init_tfm = crypto_acomp_init_tfm,
95 #ifdef CONFIG_PROC_FS
96 	.show = crypto_acomp_show,
97 #endif
98 	.report = crypto_acomp_report,
99 	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
100 	.maskset = CRYPTO_ALG_TYPE_ACOMPRESS_MASK,
101 	.type = CRYPTO_ALG_TYPE_ACOMPRESS,
102 	.tfmsize = offsetof(struct crypto_acomp, base),
103 };
104 
crypto_alloc_acomp(const char * alg_name,u32 type,u32 mask)105 struct crypto_acomp *crypto_alloc_acomp(const char *alg_name, u32 type,
106 					u32 mask)
107 {
108 	return crypto_alloc_tfm(alg_name, &crypto_acomp_type, type, mask);
109 }
110 EXPORT_SYMBOL_GPL(crypto_alloc_acomp);
111 
crypto_alloc_acomp_node(const char * alg_name,u32 type,u32 mask,int node)112 struct crypto_acomp *crypto_alloc_acomp_node(const char *alg_name, u32 type,
113 					u32 mask, int node)
114 {
115 	return crypto_alloc_tfm_node(alg_name, &crypto_acomp_type, type, mask,
116 				node);
117 }
118 EXPORT_SYMBOL_GPL(crypto_alloc_acomp_node);
119 
acomp_request_alloc(struct crypto_acomp * acomp)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 
acomp_request_free(struct acomp_req * req)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 
crypto_register_acomp(struct acomp_alg * alg)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 
crypto_unregister_acomp(struct acomp_alg * alg)162 void crypto_unregister_acomp(struct acomp_alg *alg)
163 {
164 	crypto_unregister_alg(&alg->base);
165 }
166 EXPORT_SYMBOL_GPL(crypto_unregister_acomp);
167 
crypto_register_acomps(struct acomp_alg * algs,int count)168 int crypto_register_acomps(struct acomp_alg *algs, int count)
169 {
170 	int i, ret;
171 
172 	for (i = 0; i < count; i++) {
173 		ret = crypto_register_acomp(&algs[i]);
174 		if (ret)
175 			goto err;
176 	}
177 
178 	return 0;
179 
180 err:
181 	for (--i; i >= 0; --i)
182 		crypto_unregister_acomp(&algs[i]);
183 
184 	return ret;
185 }
186 EXPORT_SYMBOL_GPL(crypto_register_acomps);
187 
crypto_unregister_acomps(struct acomp_alg * algs,int count)188 void crypto_unregister_acomps(struct acomp_alg *algs, int count)
189 {
190 	int i;
191 
192 	for (i = count - 1; i >= 0; --i)
193 		crypto_unregister_acomp(&algs[i]);
194 }
195 EXPORT_SYMBOL_GPL(crypto_unregister_acomps);
196 
197 MODULE_LICENSE("GPL");
198 MODULE_DESCRIPTION("Asynchronous compression type");
199