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");