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
  10 #include <crypto/internal/acompress.h>
  11 #include <linux/cryptouser.h>
  12 #include <linux/errno.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/seq_file.h>
  16 #include <linux/slab.h>
  17 #include <linux/string.h>
  18 #include <net/netlink.h>
  19
  20 #include "compress.h"
  21
  22 struct crypto_scomp;
  23
  24 static const struct crypto_type crypto_acomp_type;
  25
  26 static inline struct acomp_alg *__crypto_acomp_alg(struct crypto_alg *alg)
  27 {
  28         return container_of(alg, struct acomp_alg, calg.base);
  29 }
  30
  31 static inline struct acomp_alg *crypto_acomp_alg(struct crypto_acomp *tfm)
  32 {
  33         return __crypto_acomp_alg(crypto_acomp_tfm(tfm)->__crt_alg);
  34 }
  35
  36 static int __maybe_unused crypto_acomp_report(
  37         struct sk_buff *skb, struct crypto_alg *alg)
  38 {
  39         struct crypto_report_acomp racomp;
  40
  41         memset(&racomp, 0, sizeof(racomp));
  42
  43         strscpy(racomp.type, "acomp", sizeof(racomp.type));
  44
  45         return nla_put(skb, CRYPTOCFGA_REPORT_ACOMP, sizeof(racomp), &racomp);
  46 }
  47
  48 static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
  49         __maybe_unused;
  50
  51 static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
  52 {
  53         seq_puts(m, "type         : acomp\n");
  54 }
  55
  56 static void crypto_acomp_exit_tfm(struct crypto_tfm *tfm)
  57 {
  58         struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
  59         struct acomp_alg *alg = crypto_acomp_alg(acomp);
  60
  61         alg->exit(acomp);
  62 }
  63
  64 static int crypto_acomp_init_tfm(struct crypto_tfm *tfm)
  65 {
  66         struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
  67         struct acomp_alg *alg = crypto_acomp_alg(acomp);
  68
  69         if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
  70                 return crypto_init_scomp_ops_async(tfm);
  71
  72         acomp->compress = alg->compress;
  73         acomp->decompress = alg->decompress;
  74         acomp->dst_free = alg->dst_free;
  75         acomp->reqsize = alg->reqsize;
  76
  77         if (alg->exit)
  78                 acomp->base.exit = crypto_acomp_exit_tfm;
  79
  80         if (alg->init)
  81                 return alg->init(acomp);
  82
  83         return 0;
  84 }
  85
  86 static unsigned int crypto_acomp_extsize(struct crypto_alg *alg)
  87 {
  88         int extsize = crypto_alg_extsize(alg);
  89
  90         if (alg->cra_type != &crypto_acomp_type)
  91                 extsize += sizeof(struct crypto_scomp *);
  92
  93         return extsize;
  94 }
  95
  96 static const struct crypto_type crypto_acomp_type = {
  97         .extsize = crypto_acomp_extsize,
  98         .init_tfm = crypto_acomp_init_tfm,
  99 #ifdef CONFIG_PROC_FS
 100         .show = crypto_acomp_show,
 101 #endif
 102 #if IS_ENABLED(CONFIG_CRYPTO_USER)
 103         .report = crypto_acomp_report,
 104 #endif
 105         .maskclear = ~CRYPTO_ALG_TYPE_MASK,
 106         .maskset = CRYPTO_ALG_TYPE_ACOMPRESS_MASK,
 107         .type = CRYPTO_ALG_TYPE_ACOMPRESS,
 108         .tfmsize = offsetof(struct crypto_acomp, base),
 109 };
 110
 111 struct crypto_acomp *crypto_alloc_acomp(const char *alg_name, u32 type,
 112                                         u32 mask)
 113 {
 114         return crypto_alloc_tfm(alg_name, &crypto_acomp_type, type, mask);
 115 }
 116 EXPORT_SYMBOL_GPL(crypto_alloc_acomp);
 117
 118 struct crypto_acomp *crypto_alloc_acomp_node(const char *alg_name, u32 type,
 119                                         u32 mask, int node)
 120 {
 121         return crypto_alloc_tfm_node(alg_name, &crypto_acomp_type, type, mask,
 122                                 node);
 123 }
 124 EXPORT_SYMBOL_GPL(crypto_alloc_acomp_node);
 125
 126 struct acomp_req *acomp_request_alloc(struct crypto_acomp *acomp)
 127 {
 128         struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
 129         struct acomp_req *req;
 130
 131         req = __acomp_request_alloc(acomp);
 132         if (req && (tfm->__crt_alg->cra_type != &crypto_acomp_type))
 133                 return crypto_acomp_scomp_alloc_ctx(req);
 134
 135         return req;
 136 }
 137 EXPORT_SYMBOL_GPL(acomp_request_alloc);
 138
 139 void acomp_request_free(struct acomp_req *req)
 140 {
 141         struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
 142         struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
 143
 144         if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
 145                 crypto_acomp_scomp_free_ctx(req);
 146
 147         if (req->flags & CRYPTO_ACOMP_ALLOC_OUTPUT) {
 148                 acomp->dst_free(req->dst);
 149                 req->dst = NULL;
 150         }
 151
 152         __acomp_request_free(req);
 153 }
 154 EXPORT_SYMBOL_GPL(acomp_request_free);
 155
 156 void comp_prepare_alg(struct comp_alg_common *alg)
 157 {
 158         struct crypto_alg *base = &alg->base;
 159
 160         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
 161 }
 162
 163 int crypto_register_acomp(struct acomp_alg *alg)
 164 {
 165         struct crypto_alg *base = &alg->calg.base;
 166
 167         comp_prepare_alg(&alg->calg);
 168
 169         base->cra_type = &crypto_acomp_type;
 170         base->cra_flags |= CRYPTO_ALG_TYPE_ACOMPRESS;
 171
 172         return crypto_register_alg(base);
 173 }
 174 EXPORT_SYMBOL_GPL(crypto_register_acomp);
 175
 176 void crypto_unregister_acomp(struct acomp_alg *alg)
 177 {
 178         crypto_unregister_alg(&alg->base);
 179 }
 180 EXPORT_SYMBOL_GPL(crypto_unregister_acomp);
 181
 182 int crypto_register_acomps(struct acomp_alg *algs, int count)
 183 {
 184         int i, ret;
 185
 186         for (i = 0; i < count; i++) {
 187                 ret = crypto_register_acomp(&algs[i]);
 188                 if (ret)
 189                         goto err;
 190         }
 191
 192         return 0;
 193
 194 err:
 195         for (--i; i >= 0; --i)
 196                 crypto_unregister_acomp(&algs[i]);
 197
 198         return ret;
 199 }
 200 EXPORT_SYMBOL_GPL(crypto_register_acomps);
 201
 202 void crypto_unregister_acomps(struct acomp_alg *algs, int count)
 203 {
 204         int i;
 205
 206         for (i = count - 1; i >= 0; --i)
 207                 crypto_unregister_acomp(&algs[i]);
 208 }
 209 EXPORT_SYMBOL_GPL(crypto_unregister_acomps);
 210
 211 MODULE_LICENSE("GPL");
 212 MODULE_DESCRIPTION("Asynchronous compression type");