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