crypto/acompress.c

   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 void crypto_unregister_acomp(struct acomp_alg *alg)
 155 {
 156         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");