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TOMOYO Linux Cross Reference
Linux/crypto/acompress.c

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  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
 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
 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 
 47 static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
 48 {
 49         seq_puts(m, "type         : acomp\n");
 50 }
 51 
 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 
 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 
 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 
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 
112 struct acomp_req *acomp_request_alloc(struct crypto_acomp *acomp)
113 {
114         struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
115         struct acomp_req *req;
116 
117         req = __acomp_request_alloc(acomp);
118         if (req && (tfm->__crt_alg->cra_type != &crypto_acomp_type))
119                 return crypto_acomp_scomp_alloc_ctx(req);
120 
121         return req;
122 }
123 EXPORT_SYMBOL_GPL(acomp_request_alloc);
124 
125 void acomp_request_free(struct acomp_req *req)
126 {
127         struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
128         struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
129 
130         if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
131                 crypto_acomp_scomp_free_ctx(req);
132 
133         if (req->flags & CRYPTO_ACOMP_ALLOC_OUTPUT) {
134                 acomp->dst_free(req->dst);
135                 req->dst = NULL;
136         }
137 
138         __acomp_request_free(req);
139 }
140 EXPORT_SYMBOL_GPL(acomp_request_free);
141 
142 int crypto_register_acomp(struct acomp_alg *alg)
143 {
144         struct crypto_alg *base = &alg->base;
145 
146         base->cra_type = &crypto_acomp_type;
147         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
148         base->cra_flags |= CRYPTO_ALG_TYPE_ACOMPRESS;
149 
150         return crypto_register_alg(base);
151 }
152 EXPORT_SYMBOL_GPL(crypto_register_acomp);
153 
154 int crypto_unregister_acomp(struct acomp_alg *alg)
155 {
156         return crypto_unregister_alg(&alg->base);
157 }
158 EXPORT_SYMBOL_GPL(crypto_unregister_acomp);
159 
160 int crypto_register_acomps(struct acomp_alg *algs, int count)
161 {
162         int i, ret;
163 
164         for (i = 0; i < count; i++) {
165                 ret = crypto_register_acomp(&algs[i]);
166                 if (ret)
167                         goto err;
168         }
169 
170         return 0;
171 
172 err:
173         for (--i; i >= 0; --i)
174                 crypto_unregister_acomp(&algs[i]);
175 
176         return ret;
177 }
178 EXPORT_SYMBOL_GPL(crypto_register_acomps);
179 
180 void crypto_unregister_acomps(struct acomp_alg *algs, int count)
181 {
182         int i;
183 
184         for (i = count - 1; i >= 0; --i)
185                 crypto_unregister_acomp(&algs[i]);
186 }
187 EXPORT_SYMBOL_GPL(crypto_unregister_acomps);
188 
189 MODULE_LICENSE("GPL");
190 MODULE_DESCRIPTION("Asynchronous compression type");
191 

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