// SPDX-License-Identifier: GPL-2.0-or-later

  /*
   * Asynchronous Compression operations
   *
   * Copyright (c) 2016, Intel Corporation
   * Authors: Weigang Li <weigang.li@intel.com>
   *          Giovanni Cabiddu <giovanni.cabiddu@intel.com>

   */
  #include <linux/errno.h>
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/seq_file.h>
  #include <linux/slab.h>
  #include <linux/string.h>
  #include <linux/crypto.h>
  #include <crypto/algapi.h>
  #include <linux/cryptouser.h>

  #include <linux/compiler.h>

  #include <net/netlink.h>
  #include <crypto/internal/acompress.h>

  #include <crypto/internal/scompress.h>

  #include "internal.h"

  static const struct crypto_type crypto_acomp_type;

  #ifdef CONFIG_NET
  static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg)
  {
  	struct crypto_report_acomp racomp;

  	memset(&racomp, 0, sizeof(racomp));

  	strscpy(racomp.type, "acomp", sizeof(racomp.type));

  	return nla_put(skb, CRYPTOCFGA_REPORT_ACOMP, sizeof(racomp), &racomp);

  }
  #else
  static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg)
  {
  	return -ENOSYS;
  }
  #endif
  
  static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)

  	__maybe_unused;

  
  static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
  {
  	seq_puts(m, "type         : acomp
  ");
  }
  
  static void crypto_acomp_exit_tfm(struct crypto_tfm *tfm)
  {
  	struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
  	struct acomp_alg *alg = crypto_acomp_alg(acomp);
  
  	alg->exit(acomp);
  }
  
  static int crypto_acomp_init_tfm(struct crypto_tfm *tfm)
  {
  	struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
  	struct acomp_alg *alg = crypto_acomp_alg(acomp);

  	if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
  		return crypto_init_scomp_ops_async(tfm);
  
  	acomp->compress = alg->compress;
  	acomp->decompress = alg->decompress;
  	acomp->dst_free = alg->dst_free;
  	acomp->reqsize = alg->reqsize;

  	if (alg->exit)
  		acomp->base.exit = crypto_acomp_exit_tfm;
  
  	if (alg->init)
  		return alg->init(acomp);
  
  	return 0;
  }

  static unsigned int crypto_acomp_extsize(struct crypto_alg *alg)
  {
  	int extsize = crypto_alg_extsize(alg);
  
  	if (alg->cra_type != &crypto_acomp_type)
  		extsize += sizeof(struct crypto_scomp *);
  
  	return extsize;
  }

  static const struct crypto_type crypto_acomp_type = {

  	.extsize = crypto_acomp_extsize,

  	.init_tfm = crypto_acomp_init_tfm,
  #ifdef CONFIG_PROC_FS
  	.show = crypto_acomp_show,
  #endif
  	.report = crypto_acomp_report,
  	.maskclear = ~CRYPTO_ALG_TYPE_MASK,

  	.maskset = CRYPTO_ALG_TYPE_ACOMPRESS_MASK,

  	.type = CRYPTO_ALG_TYPE_ACOMPRESS,
  	.tfmsize = offsetof(struct crypto_acomp, base),
  };
  
  struct crypto_acomp *crypto_alloc_acomp(const char *alg_name, u32 type,
  					u32 mask)
  {
  	return crypto_alloc_tfm(alg_name, &crypto_acomp_type, type, mask);
  }
  EXPORT_SYMBOL_GPL(crypto_alloc_acomp);

  struct crypto_acomp *crypto_alloc_acomp_node(const char *alg_name, u32 type,
  					u32 mask, int node)
  {
  	return crypto_alloc_tfm_node(alg_name, &crypto_acomp_type, type, mask,
  				node);
  }
  EXPORT_SYMBOL_GPL(crypto_alloc_acomp_node);

  struct acomp_req *acomp_request_alloc(struct crypto_acomp *acomp)
  {
  	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
  	struct acomp_req *req;
  
  	req = __acomp_request_alloc(acomp);
  	if (req && (tfm->__crt_alg->cra_type != &crypto_acomp_type))
  		return crypto_acomp_scomp_alloc_ctx(req);
  
  	return req;
  }
  EXPORT_SYMBOL_GPL(acomp_request_alloc);
  
  void acomp_request_free(struct acomp_req *req)
  {
  	struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
  	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
  
  	if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
  		crypto_acomp_scomp_free_ctx(req);
  
  	if (req->flags & CRYPTO_ACOMP_ALLOC_OUTPUT) {
  		acomp->dst_free(req->dst);
  		req->dst = NULL;
  	}
  
  	__acomp_request_free(req);
  }
  EXPORT_SYMBOL_GPL(acomp_request_free);

  int crypto_register_acomp(struct acomp_alg *alg)
  {
  	struct crypto_alg *base = &alg->base;
  
  	base->cra_type = &crypto_acomp_type;
  	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
  	base->cra_flags |= CRYPTO_ALG_TYPE_ACOMPRESS;
  
  	return crypto_register_alg(base);
  }
  EXPORT_SYMBOL_GPL(crypto_register_acomp);

  void crypto_unregister_acomp(struct acomp_alg *alg)

  {

  	crypto_unregister_alg(&alg->base);

  }
  EXPORT_SYMBOL_GPL(crypto_unregister_acomp);

  int crypto_register_acomps(struct acomp_alg *algs, int count)
  {
  	int i, ret;
  
  	for (i = 0; i < count; i++) {
  		ret = crypto_register_acomp(&algs[i]);
  		if (ret)
  			goto err;
  	}
  
  	return 0;
  
  err:
  	for (--i; i >= 0; --i)
  		crypto_unregister_acomp(&algs[i]);
  
  	return ret;
  }
  EXPORT_SYMBOL_GPL(crypto_register_acomps);
  
  void crypto_unregister_acomps(struct acomp_alg *algs, int count)
  {
  	int i;
  
  	for (i = count - 1; i >= 0; --i)
  		crypto_unregister_acomp(&algs[i]);
  }
  EXPORT_SYMBOL_GPL(crypto_unregister_acomps);

  MODULE_LICENSE("GPL");
  MODULE_DESCRIPTION("Asynchronous compression type");