linux/crypto/acompress.c
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   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
  24static const struct crypto_type crypto_acomp_type;
  25
  26#ifdef CONFIG_NET
  27static 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
  38static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg)
  39{
  40        return -ENOSYS;
  41}
  42#endif
  43
  44static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
  45        __maybe_unused;
  46
  47static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
  48{
  49        seq_puts(m, "type         : acomp\n");
  50}
  51
  52static 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
  60static 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
  82static 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
  92static 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
 105struct 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}
 110EXPORT_SYMBOL_GPL(crypto_alloc_acomp);
 111
 112struct crypto_acomp *crypto_alloc_acomp_node(const char *alg_name, u32 type,
 113                                        u32 mask, int node)
 114{
 115        return crypto_alloc_tfm_node(alg_name, &crypto_acomp_type, type, mask,
 116                                node);
 117}
 118EXPORT_SYMBOL_GPL(crypto_alloc_acomp_node);
 119
 120struct 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}
 131EXPORT_SYMBOL_GPL(acomp_request_alloc);
 132
 133void 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}
 148EXPORT_SYMBOL_GPL(acomp_request_free);
 149
 150int 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}
 160EXPORT_SYMBOL_GPL(crypto_register_acomp);
 161
 162void crypto_unregister_acomp(struct acomp_alg *alg)
 163{
 164        crypto_unregister_alg(&alg->base);
 165}
 166EXPORT_SYMBOL_GPL(crypto_unregister_acomp);
 167
 168int crypto_register_acomps(struct acomp_alg *algs, int count)
 169{
 170        int i, ret;
 171
 172        for (i = 0; i < count; i++) {
 173                ret = crypto_register_acomp(&algs[i]);
 174                if (ret)
 175                        goto err;
 176        }
 177
 178        return 0;
 179
 180err:
 181        for (--i; i >= 0; --i)
 182                crypto_unregister_acomp(&algs[i]);
 183
 184        return ret;
 185}
 186EXPORT_SYMBOL_GPL(crypto_register_acomps);
 187
 188void crypto_unregister_acomps(struct acomp_alg *algs, int count)
 189{
 190        int i;
 191
 192        for (i = count - 1; i >= 0; --i)
 193                crypto_unregister_acomp(&algs[i]);
 194}
 195EXPORT_SYMBOL_GPL(crypto_unregister_acomps);
 196
 197MODULE_LICENSE("GPL");
 198MODULE_DESCRIPTION("Asynchronous compression type");
 199
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