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Linux/crypto/acompress.c

  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 
 28 static const struct crypto_type crypto_acomp_type;
 29 
 30 #ifdef CONFIG_NET
 31 static 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 
 42 nla_put_failure:
 43         return -EMSGSIZE;
 44 }
 45 #else
 46 static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg)
 47 {
 48         return -ENOSYS;
 49 }
 50 #endif
 51 
 52 static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
 53         __attribute__ ((unused));
 54 
 55 static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
 56 {
 57         seq_puts(m, "type         : acomp\n");
 58 }
 59 
 60 static 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 
 68 static 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 
 90 static 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 
100 static 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 
113 struct 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 }
118 EXPORT_SYMBOL_GPL(crypto_alloc_acomp);
119 
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 
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 
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 
162 int crypto_unregister_acomp(struct acomp_alg *alg)
163 {
164         return crypto_unregister_alg(&alg->base);
165 }
166 EXPORT_SYMBOL_GPL(crypto_unregister_acomp);
167 
168 MODULE_LICENSE("GPL");
169 MODULE_DESCRIPTION("Asynchronous compression type");
170 

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