crypto/scompress.c - third_party/kernel - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Synchronous Compression operations
  *
  * Copyright 2015 LG Electronics Inc.
  * Copyright (c) 2016, Intel Corporation
  * Author: 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 <linux/compiler.h>
 #include <linux/vmalloc.h>
 #include <crypto/algapi.h>
 #include <linux/cryptouser.h>
 #include <net/netlink.h>
 #include <linux/scatterlist.h>
 #include <crypto/scatterwalk.h>
 #include <crypto/internal/acompress.h>
 #include <crypto/internal/scompress.h>
 #include "internal.h"

 struct scomp_scratch {
 	spinlock_t	lock;
 	void		*src;
 	void		*dst;
 };

 static DEFINE_PER_CPU(struct scomp_scratch, scomp_scratch) = {
 	.lock = __SPIN_LOCK_UNLOCKED(scomp_scratch.lock),
 };

 static const struct crypto_type crypto_scomp_type;
 static int scomp_scratch_users;
 static DEFINE_MUTEX(scomp_lock);

 #ifdef CONFIG_NET
 static int crypto_scomp_report(struct sk_buff *skb, struct crypto_alg *alg)
 {
 	struct crypto_report_comp rscomp;

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

 	strscpy(rscomp.type, "scomp", sizeof(rscomp.type));

 	return nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
 		       sizeof(rscomp), &rscomp);
 }
 #else
 static int crypto_scomp_report(struct sk_buff *skb, struct crypto_alg *alg)
 {
 	return -ENOSYS;
 }
 #endif

 static void crypto_scomp_show(struct seq_file *m, struct crypto_alg *alg)
 	__maybe_unused;

 static void crypto_scomp_show(struct seq_file *m, struct crypto_alg *alg)
 {
 	seq_puts(m, "type         : scomp\n");
 }

 static void crypto_scomp_free_scratches(void)
 {
 	struct scomp_scratch *scratch;
 	int i;

 	for_each_possible_cpu(i) {
 		scratch = per_cpu_ptr(&scomp_scratch, i);

 		vfree(scratch->src);
 		vfree(scratch->dst);
 		scratch->src = NULL;
 		scratch->dst = NULL;
 	}
 }

 static int crypto_scomp_alloc_scratches(void)
 {
 	struct scomp_scratch *scratch;
 	int i;

 	for_each_possible_cpu(i) {
 		void *mem;

 		scratch = per_cpu_ptr(&scomp_scratch, i);

 		mem = vmalloc_node(SCOMP_SCRATCH_SIZE, cpu_to_node(i));
 		if (!mem)
 			goto error;
 		scratch->src = mem;
 		mem = vmalloc_node(SCOMP_SCRATCH_SIZE, cpu_to_node(i));
 		if (!mem)
 			goto error;
 		scratch->dst = mem;
 	}
 	return 0;
 error:
 	crypto_scomp_free_scratches();
 	return -ENOMEM;
 }

 static int crypto_scomp_init_tfm(struct crypto_tfm *tfm)
 {
 	int ret = 0;

 	mutex_lock(&scomp_lock);
 	if (!scomp_scratch_users++)
 		ret = crypto_scomp_alloc_scratches();
 	mutex_unlock(&scomp_lock);

 	return ret;
 }

 static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir)
 {
 	struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
 	void **tfm_ctx = acomp_tfm_ctx(tfm);
 	struct crypto_scomp *scomp = *tfm_ctx;
 	void **ctx = acomp_request_ctx(req);
 	struct scomp_scratch *scratch;
 	unsigned int dlen;
 	int ret;

 	if (!req->src || !req->slen || req->slen > SCOMP_SCRATCH_SIZE)
 		return -EINVAL;

 	if (req->dst && !req->dlen)
 		return -EINVAL;

 	if (!req->dlen || req->dlen > SCOMP_SCRATCH_SIZE)
 		req->dlen = SCOMP_SCRATCH_SIZE;

 	dlen = req->dlen;

 	scratch = raw_cpu_ptr(&scomp_scratch);
 	spin_lock(&scratch->lock);

 	scatterwalk_map_and_copy(scratch->src, req->src, 0, req->slen, 0);
 	if (dir)
 		ret = crypto_scomp_compress(scomp, scratch->src, req->slen,
 					    scratch->dst, &req->dlen, *ctx);
 	else
 		ret = crypto_scomp_decompress(scomp, scratch->src, req->slen,
 					      scratch->dst, &req->dlen, *ctx);
 	if (!ret) {
 		if (!req->dst) {
 			req->dst = sgl_alloc(req->dlen, GFP_ATOMIC, NULL);
 			if (!req->dst) {
 				ret = -ENOMEM;
 				goto out;
 			}
 		} else if (req->dlen > dlen) {
 			ret = -ENOSPC;
 			goto out;
 		}
 		scatterwalk_map_and_copy(scratch->dst, req->dst, 0, req->dlen,
 					 1);
 	}
 out:
 	spin_unlock(&scratch->lock);
 	return ret;
 }

 static int scomp_acomp_compress(struct acomp_req *req)
 {
 	return scomp_acomp_comp_decomp(req, 1);
 }

 static int scomp_acomp_decompress(struct acomp_req *req)
 {
 	return scomp_acomp_comp_decomp(req, 0);
 }

 static void crypto_exit_scomp_ops_async(struct crypto_tfm *tfm)
 {
 	struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);

 	crypto_free_scomp(*ctx);

 	mutex_lock(&scomp_lock);
 	if (!--scomp_scratch_users)
 		crypto_scomp_free_scratches();
 	mutex_unlock(&scomp_lock);
 }

 int crypto_init_scomp_ops_async(struct crypto_tfm *tfm)
 {
 	struct crypto_alg *calg = tfm->__crt_alg;
 	struct crypto_acomp *crt = __crypto_acomp_tfm(tfm);
 	struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);
 	struct crypto_scomp *scomp;

 	if (!crypto_mod_get(calg))
 		return -EAGAIN;

 	scomp = crypto_create_tfm(calg, &crypto_scomp_type);
 	if (IS_ERR(scomp)) {
 		crypto_mod_put(calg);
 		return PTR_ERR(scomp);
 	}

 	*ctx = scomp;
 	tfm->exit = crypto_exit_scomp_ops_async;

 	crt->compress = scomp_acomp_compress;
 	crt->decompress = scomp_acomp_decompress;
 	crt->dst_free = sgl_free;
 	crt->reqsize = sizeof(void *);

 	return 0;
 }

 struct acomp_req *crypto_acomp_scomp_alloc_ctx(struct acomp_req *req)
 {
 	struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
 	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
 	struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
 	struct crypto_scomp *scomp = *tfm_ctx;
 	void *ctx;

 	ctx = crypto_scomp_alloc_ctx(scomp);
 	if (IS_ERR(ctx)) {
 		kfree(req);
 		return NULL;
 	}

 	*req->__ctx = ctx;

 	return req;
 }

 void crypto_acomp_scomp_free_ctx(struct acomp_req *req)
 {
 	struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
 	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
 	struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
 	struct crypto_scomp *scomp = *tfm_ctx;
 	void *ctx = *req->__ctx;

 	if (ctx)
 		crypto_scomp_free_ctx(scomp, ctx);
 }

 static const struct crypto_type crypto_scomp_type = {
 	.extsize = crypto_alg_extsize,
 	.init_tfm = crypto_scomp_init_tfm,
 #ifdef CONFIG_PROC_FS
 	.show = crypto_scomp_show,
 #endif
 	.report = crypto_scomp_report,
 	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
 	.maskset = CRYPTO_ALG_TYPE_MASK,
 	.type = CRYPTO_ALG_TYPE_SCOMPRESS,
 	.tfmsize = offsetof(struct crypto_scomp, base),
 };

 int crypto_register_scomp(struct scomp_alg *alg)
 {
 	struct crypto_alg *base = &alg->base;

 	base->cra_type = &crypto_scomp_type;
 	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
 	base->cra_flags |= CRYPTO_ALG_TYPE_SCOMPRESS;

 	return crypto_register_alg(base);
 }
 EXPORT_SYMBOL_GPL(crypto_register_scomp);

 void crypto_unregister_scomp(struct scomp_alg *alg)
 {
 	crypto_unregister_alg(&alg->base);
 }
 EXPORT_SYMBOL_GPL(crypto_unregister_scomp);

 int crypto_register_scomps(struct scomp_alg *algs, int count)
 {
 	int i, ret;

 	for (i = 0; i < count; i++) {
 		ret = crypto_register_scomp(&algs[i]);
 		if (ret)
 			goto err;
 	}

 	return 0;

 err:
 	for (--i; i >= 0; --i)
 		crypto_unregister_scomp(&algs[i]);

 	return ret;
 }
 EXPORT_SYMBOL_GPL(crypto_register_scomps);

 void crypto_unregister_scomps(struct scomp_alg *algs, int count)
 {
 	int i;

 	for (i = count - 1; i >= 0; --i)
 		crypto_unregister_scomp(&algs[i]);
 }
 EXPORT_SYMBOL_GPL(crypto_unregister_scomps);

 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Synchronous compression type");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Synchronous Compression operations
	*
	* Copyright 2015 LG Electronics Inc.
	* Copyright (c) 2016, Intel Corporation
	* Author: 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 <linux/compiler.h>
	#include <linux/vmalloc.h>
	#include <crypto/algapi.h>
	#include <linux/cryptouser.h>
	#include <net/netlink.h>
	#include <linux/scatterlist.h>
	#include <crypto/scatterwalk.h>
	#include <crypto/internal/acompress.h>
	#include <crypto/internal/scompress.h>
	#include "internal.h"

	struct scomp_scratch {
	spinlock_t lock;
	void *src;
	void *dst;
	};

	static DEFINE_PER_CPU(struct scomp_scratch, scomp_scratch) = {
	.lock = __SPIN_LOCK_UNLOCKED(scomp_scratch.lock),
	};

	static const struct crypto_type crypto_scomp_type;
	static int scomp_scratch_users;
	static DEFINE_MUTEX(scomp_lock);

	#ifdef CONFIG_NET
	static int crypto_scomp_report(struct sk_buff skb, struct crypto_alg alg)
	{
	struct crypto_report_comp rscomp;

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

	strscpy(rscomp.type, "scomp", sizeof(rscomp.type));

	return nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
	sizeof(rscomp), &rscomp);
	}
	#else
	static int crypto_scomp_report(struct sk_buff skb, struct crypto_alg alg)
	{
	return -ENOSYS;
	}
	#endif

	static void crypto_scomp_show(struct seq_file m, struct crypto_alg alg)
	__maybe_unused;

	static void crypto_scomp_show(struct seq_file m, struct crypto_alg alg)
	{
	seq_puts(m, "type : scomp\n");
	}

	static void crypto_scomp_free_scratches(void)
	{
	struct scomp_scratch *scratch;
	int i;

	for_each_possible_cpu(i) {
	scratch = per_cpu_ptr(&scomp_scratch, i);

	vfree(scratch->src);
	vfree(scratch->dst);
	scratch->src = NULL;
	scratch->dst = NULL;
	}
	}

	static int crypto_scomp_alloc_scratches(void)
	{
	struct scomp_scratch *scratch;
	int i;

	for_each_possible_cpu(i) {
	void *mem;

	scratch = per_cpu_ptr(&scomp_scratch, i);

	mem = vmalloc_node(SCOMP_SCRATCH_SIZE, cpu_to_node(i));
	if (!mem)
	goto error;
	scratch->src = mem;
	mem = vmalloc_node(SCOMP_SCRATCH_SIZE, cpu_to_node(i));
	if (!mem)
	goto error;
	scratch->dst = mem;
	}
	return 0;
	error:
	crypto_scomp_free_scratches();
	return -ENOMEM;
	}

	static int crypto_scomp_init_tfm(struct crypto_tfm *tfm)
	{
	int ret = 0;

	mutex_lock(&scomp_lock);
	if (!scomp_scratch_users++)
	ret = crypto_scomp_alloc_scratches();
	mutex_unlock(&scomp_lock);

	return ret;
	}

	static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir)
	{
	struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
	void **tfm_ctx = acomp_tfm_ctx(tfm);
	struct crypto_scomp scomp = tfm_ctx;
	void **ctx = acomp_request_ctx(req);
	struct scomp_scratch *scratch;
	unsigned int dlen;
	int ret;

	if (!req->src \|\| !req->slen \|\| req->slen > SCOMP_SCRATCH_SIZE)
	return -EINVAL;

	if (req->dst && !req->dlen)
	return -EINVAL;

	if (!req->dlen \|\| req->dlen > SCOMP_SCRATCH_SIZE)
	req->dlen = SCOMP_SCRATCH_SIZE;

	dlen = req->dlen;

	scratch = raw_cpu_ptr(&scomp_scratch);
	spin_lock(&scratch->lock);

	scatterwalk_map_and_copy(scratch->src, req->src, 0, req->slen, 0);
	if (dir)
	ret = crypto_scomp_compress(scomp, scratch->src, req->slen,
	scratch->dst, &req->dlen, *ctx);
	else
	ret = crypto_scomp_decompress(scomp, scratch->src, req->slen,
	scratch->dst, &req->dlen, *ctx);
	if (!ret) {
	if (!req->dst) {
	req->dst = sgl_alloc(req->dlen, GFP_ATOMIC, NULL);
	if (!req->dst) {
	ret = -ENOMEM;
	goto out;
	}
	} else if (req->dlen > dlen) {
	ret = -ENOSPC;
	goto out;
	}
	scatterwalk_map_and_copy(scratch->dst, req->dst, 0, req->dlen,
	1);
	}
	out:
	spin_unlock(&scratch->lock);
	return ret;
	}

	static int scomp_acomp_compress(struct acomp_req *req)
	{
	return scomp_acomp_comp_decomp(req, 1);
	}

	static int scomp_acomp_decompress(struct acomp_req *req)
	{
	return scomp_acomp_comp_decomp(req, 0);
	}

	static void crypto_exit_scomp_ops_async(struct crypto_tfm *tfm)
	{
	struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);

	crypto_free_scomp(*ctx);

	mutex_lock(&scomp_lock);
	if (!--scomp_scratch_users)
	crypto_scomp_free_scratches();
	mutex_unlock(&scomp_lock);
	}

	int crypto_init_scomp_ops_async(struct crypto_tfm *tfm)
	{
	struct crypto_alg *calg = tfm->__crt_alg;
	struct crypto_acomp *crt = __crypto_acomp_tfm(tfm);
	struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);
	struct crypto_scomp *scomp;

	if (!crypto_mod_get(calg))
	return -EAGAIN;

	scomp = crypto_create_tfm(calg, &crypto_scomp_type);
	if (IS_ERR(scomp)) {
	crypto_mod_put(calg);
	return PTR_ERR(scomp);
	}

	*ctx = scomp;
	tfm->exit = crypto_exit_scomp_ops_async;

	crt->compress = scomp_acomp_compress;
	crt->decompress = scomp_acomp_decompress;
	crt->dst_free = sgl_free;
	crt->reqsize = sizeof(void *);

	return 0;
	}

	struct acomp_req crypto_acomp_scomp_alloc_ctx(struct acomp_req req)
	{
	struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
	struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
	struct crypto_scomp scomp = tfm_ctx;
	void *ctx;

	ctx = crypto_scomp_alloc_ctx(scomp);
	if (IS_ERR(ctx)) {
	kfree(req);
	return NULL;
	}

	*req->__ctx = ctx;

	return req;
	}

	void crypto_acomp_scomp_free_ctx(struct acomp_req *req)
	{
	struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
	struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
	struct crypto_scomp scomp = tfm_ctx;
	void ctx = req->__ctx;

	if (ctx)
	crypto_scomp_free_ctx(scomp, ctx);
	}

	static const struct crypto_type crypto_scomp_type = {
	.extsize = crypto_alg_extsize,
	.init_tfm = crypto_scomp_init_tfm,
	#ifdef CONFIG_PROC_FS
	.show = crypto_scomp_show,
	#endif
	.report = crypto_scomp_report,
	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	.maskset = CRYPTO_ALG_TYPE_MASK,
	.type = CRYPTO_ALG_TYPE_SCOMPRESS,
	.tfmsize = offsetof(struct crypto_scomp, base),
	};

	int crypto_register_scomp(struct scomp_alg *alg)
	{
	struct crypto_alg *base = &alg->base;

	base->cra_type = &crypto_scomp_type;
	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	base->cra_flags \|= CRYPTO_ALG_TYPE_SCOMPRESS;

	return crypto_register_alg(base);
	}
	EXPORT_SYMBOL_GPL(crypto_register_scomp);

	void crypto_unregister_scomp(struct scomp_alg *alg)
	{
	crypto_unregister_alg(&alg->base);
	}
	EXPORT_SYMBOL_GPL(crypto_unregister_scomp);

	int crypto_register_scomps(struct scomp_alg *algs, int count)
	{
	int i, ret;

	for (i = 0; i < count; i++) {
	ret = crypto_register_scomp(&algs[i]);
	if (ret)
	goto err;
	}

	return 0;

	err:
	for (--i; i >= 0; --i)
	crypto_unregister_scomp(&algs[i]);

	return ret;
	}
	EXPORT_SYMBOL_GPL(crypto_register_scomps);

	void crypto_unregister_scomps(struct scomp_alg *algs, int count)
	{
	int i;

	for (i = count - 1; i >= 0; --i)
	crypto_unregister_scomp(&algs[i]);
	}
	EXPORT_SYMBOL_GPL(crypto_unregister_scomps);

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