Release 4.10 crypto/deflate.c

Directory: crypto
/*
 * Cryptographic API.
 *
 * Deflate algorithm (RFC 1951), implemented here primarily for use
 * by IPCOMP (RFC 3173 & RFC 2394).
 *
 * Copyright (c) 2003 James Morris <jmorris@intercode.com.au>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * FIXME: deflate transforms will require up to a total of about 436k of kernel
 * memory on i386 (390k for compression, the rest for decompression), as the
 * current zlib kernel code uses a worst case pre-allocation system by default.
 * This needs to be fixed so that the amount of memory required is properly
 * related to the  winbits and memlevel parameters.
 *
 * The default winbits of 11 should suit most packets, and it may be something
 * to configure on a per-tfm basis in the future.
 *
 * Currently, compression history is not maintained between tfm calls, as
 * it is not needed for IPCOMP and keeps the code simpler.  It can be
 * implemented if someone wants it.
 */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/crypto.h>
#include <linux/zlib.h>
#include <linux/vmalloc.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/net.h>
#include <crypto/internal/scompress.h>


#define DEFLATE_DEF_LEVEL		Z_DEFAULT_COMPRESSION

#define DEFLATE_DEF_WINBITS		11

#define DEFLATE_DEF_MEMLEVEL		MAX_MEM_LEVEL


struct deflate_ctx {
	
struct z_stream_s comp_stream;
	
struct z_stream_s decomp_stream;
};



static int deflate_comp_init(struct deflate_ctx *ctx)
{
	int ret = 0;
	struct z_stream_s *stream = &ctx->comp_stream;

	stream->workspace = vzalloc(zlib_deflate_workspacesize(
				-DEFLATE_DEF_WINBITS, DEFLATE_DEF_MEMLEVEL));
	if (!stream->workspace) {
		ret = -ENOMEM;
		goto out;
	}
	ret = zlib_deflateInit2(stream, DEFLATE_DEF_LEVEL, Z_DEFLATED,
	                        -DEFLATE_DEF_WINBITS, DEFLATE_DEF_MEMLEVEL,
	                        Z_DEFAULT_STRATEGY);
	if (ret != Z_OK) {
		ret = -EINVAL;
		goto out_free;
	}
out:
	return ret;
out_free:
	vfree(stream->workspace);
	goto out;
}

Contributors
Person Tokens Prop Commits CommitProp
james morris james morris 102 93.58% 1 33.33%
james keniston james keniston 6 5.50% 1 33.33%
joe perches joe perches 1 0.92% 1 33.33%
Total 109 100.00% 3 100.00%



static int deflate_decomp_init(struct deflate_ctx *ctx)
{
	int ret = 0;
	struct z_stream_s *stream = &ctx->decomp_stream;

	stream->workspace = vzalloc(zlib_inflate_workspacesize());
	if (!stream->workspace) {
		ret = -ENOMEM;
		goto out;
	}
	ret = zlib_inflateInit2(stream, -DEFLATE_DEF_WINBITS);
	if (ret != Z_OK) {
		ret = -EINVAL;
		goto out_free;
	}
out:
	return ret;
out_free:
	vfree(stream->workspace);
	goto out;
}

Contributors
Person Tokens Prop Commits CommitProp
james morris james morris 94 97.92% 1 50.00%
david s. miller david s. miller 2 2.08% 1 50.00%
Total 96 100.00% 2 100.00%



static void deflate_comp_exit(struct deflate_ctx *ctx)
{
	zlib_deflateEnd(&ctx->comp_stream);
	vfree(ctx->comp_stream.workspace);
}

Contributors
Person Tokens Prop Commits CommitProp
james morris james morris 20 71.43% 1 50.00%
artem bityutskiy artem bityutskiy 8 28.57% 1 50.00%
Total 28 100.00% 2 100.00%



static void deflate_decomp_exit(struct deflate_ctx *ctx)
{
	zlib_inflateEnd(&ctx->decomp_stream);
	vfree(ctx->decomp_stream.workspace);
}

Contributors
Person Tokens Prop Commits CommitProp
james morris james morris 19 67.86% 1 33.33%
artem bityutskiy artem bityutskiy 8 28.57% 1 33.33%
david s. miller david s. miller 1 3.57% 1 33.33%
Total 28 100.00% 3 100.00%



static int __deflate_init(void *ctx)
{
	int ret;

	ret = deflate_comp_init(ctx);
	if (ret)
		goto out;
	ret = deflate_decomp_init(ctx);
	if (ret)
		deflate_comp_exit(ctx);
out:
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
james morris james morris 45 93.75% 1 50.00%
giovanni cabiddu giovanni cabiddu 3 6.25% 1 50.00%
Total 48 100.00% 2 100.00%



static void *deflate_alloc_ctx(struct crypto_scomp *tfm)
{
	struct deflate_ctx *ctx;
	int ret;

	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
	if (!ctx)
		return ERR_PTR(-ENOMEM);

	ret = __deflate_init(ctx);
	if (ret) {
		kfree(ctx);
		return ERR_PTR(ret);
	}

	return ctx;
}

Contributors
Person Tokens Prop Commits CommitProp
giovanni cabiddu giovanni cabiddu 70 97.22% 1 50.00%
james morris james morris 2 2.78% 1 50.00%
Total 72 100.00% 2 100.00%



static int deflate_init(struct crypto_tfm *tfm)
{
	struct deflate_ctx *ctx = crypto_tfm_ctx(tfm);

	return __deflate_init(ctx);
}

Contributors
Person Tokens Prop Commits CommitProp
herbert xu herbert xu 13 48.15% 1 33.33%
giovanni cabiddu giovanni cabiddu 10 37.04% 1 33.33%
james morris james morris 4 14.81% 1 33.33%
Total 27 100.00% 3 100.00%



static void __deflate_exit(void *ctx)
{
	deflate_comp_exit(ctx);
	deflate_decomp_exit(ctx);
}

Contributors
Person Tokens Prop Commits CommitProp
james morris james morris 11 55.00% 1 50.00%
giovanni cabiddu giovanni cabiddu 9 45.00% 1 50.00%
Total 20 100.00% 2 100.00%



static void deflate_free_ctx(struct crypto_scomp *tfm, void *ctx)
{
	__deflate_exit(ctx);
	kzfree(ctx);
}

Contributors
Person Tokens Prop Commits CommitProp
giovanni cabiddu giovanni cabiddu 19 76.00% 1 33.33%
james morris james morris 4 16.00% 1 33.33%
herbert xu herbert xu 2 8.00% 1 33.33%
Total 25 100.00% 3 100.00%



static void deflate_exit(struct crypto_tfm *tfm)
{
	struct deflate_ctx *ctx = crypto_tfm_ctx(tfm);

	__deflate_exit(ctx);
}

Contributors
Person Tokens Prop Commits CommitProp
giovanni cabiddu giovanni cabiddu 26 100.00% 1 100.00%
Total 26 100.00% 1 100.00%



static int __deflate_compress(const u8 *src, unsigned int slen,
			      u8 *dst, unsigned int *dlen, void *ctx)
{
	int ret = 0;
	struct deflate_ctx *dctx = ctx;
	struct z_stream_s *stream = &dctx->comp_stream;

	ret = zlib_deflateReset(stream);
	if (ret != Z_OK) {
		ret = -EINVAL;
		goto out;
	}

	stream->next_in = (u8 *)src;
	stream->avail_in = slen;
	stream->next_out = (u8 *)dst;
	stream->avail_out = *dlen;

	ret = zlib_deflate(stream, Z_FINISH);
	if (ret != Z_STREAM_END) {
		ret = -EINVAL;
		goto out;
	}
	ret = 0;
	*dlen = stream->total_out;
out:
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
james morris james morris 138 93.88% 1 50.00%
giovanni cabiddu giovanni cabiddu 9 6.12% 1 50.00%
Total 147 100.00% 2 100.00%



static int deflate_compress(struct crypto_tfm *tfm, const u8 *src,
			    unsigned int slen, u8 *dst, unsigned int *dlen)
{
	struct deflate_ctx *dctx = crypto_tfm_ctx(tfm);

	return __deflate_compress(src, slen, dst, dlen, dctx);
}

Contributors
Person Tokens Prop Commits CommitProp
giovanni cabiddu giovanni cabiddu 26 49.06% 1 33.33%
james morris james morris 24 45.28% 1 33.33%
herbert xu herbert xu 3 5.66% 1 33.33%
Total 53 100.00% 3 100.00%



static int deflate_scompress(struct crypto_scomp *tfm, const u8 *src,
			     unsigned int slen, u8 *dst, unsigned int *dlen,
			     void *ctx)
{
	return __deflate_compress(src, slen, dst, dlen, ctx);
}

Contributors
Person Tokens Prop Commits CommitProp
giovanni cabiddu giovanni cabiddu 47 100.00% 1 100.00%
Total 47 100.00% 1 100.00%



static int __deflate_decompress(const u8 *src, unsigned int slen,
				u8 *dst, unsigned int *dlen, void *ctx)
{

	int ret = 0;
	struct deflate_ctx *dctx = ctx;
	struct z_stream_s *stream = &dctx->decomp_stream;

	ret = zlib_inflateReset(stream);
	if (ret != Z_OK) {
		ret = -EINVAL;
		goto out;
	}

	stream->next_in = (u8 *)src;
	stream->avail_in = slen;
	stream->next_out = (u8 *)dst;
	stream->avail_out = *dlen;

	ret = zlib_inflate(stream, Z_SYNC_FLUSH);
	/*
         * Work around a bug in zlib, which sometimes wants to taste an extra
         * byte when being used in the (undocumented) raw deflate mode.
         * (From USAGI).
         */
	if (ret == Z_OK && !stream->avail_in && stream->avail_out) {
		u8 zerostuff = 0;
		stream->next_in = &zerostuff;
		stream->avail_in = 1;
		ret = zlib_inflate(stream, Z_FINISH);
	}
	if (ret != Z_STREAM_END) {
		ret = -EINVAL;
		goto out;
	}
	ret = 0;
	*dlen = stream->total_out;
out:
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
james morris james morris 164 85.42% 2 66.67%
giovanni cabiddu giovanni cabiddu 28 14.58% 1 33.33%
Total 192 100.00% 3 100.00%



static int deflate_decompress(struct crypto_tfm *tfm, const u8 *src,
			      unsigned int slen, u8 *dst, unsigned int *dlen)
{
	struct deflate_ctx *dctx = crypto_tfm_ctx(tfm);

	return __deflate_decompress(src, slen, dst, dlen, dctx);
}

Contributors
Person Tokens Prop Commits CommitProp
giovanni cabiddu giovanni cabiddu 53 100.00% 1 100.00%
Total 53 100.00% 1 100.00%



static int deflate_sdecompress(struct crypto_scomp *tfm, const u8 *src,
			       unsigned int slen, u8 *dst, unsigned int *dlen,
			       void *ctx)
{
	return __deflate_decompress(src, slen, dst, dlen, ctx);
}

Contributors
Person Tokens Prop Commits CommitProp
giovanni cabiddu giovanni cabiddu 47 100.00% 1 100.00%
Total 47 100.00% 1 100.00%


static struct crypto_alg alg = {
	.cra_name		= "deflate",
	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
	.cra_ctxsize		= sizeof(struct deflate_ctx),
	.cra_module		= THIS_MODULE,
	.cra_init		= deflate_init,
	.cra_exit		= deflate_exit,
	.cra_u			= { .compress = {
	.coa_compress 		= deflate_compress,
	.coa_decompress  	= deflate_decompress } }
};


static struct scomp_alg scomp = {
	.alloc_ctx		= deflate_alloc_ctx,
	.free_ctx		= deflate_free_ctx,
	.compress		= deflate_scompress,
	.decompress		= deflate_sdecompress,
	.base			= {
		.cra_name	= "deflate",
		.cra_driver_name = "deflate-scomp",
		.cra_module	 = THIS_MODULE,
        }
};



static int __init deflate_mod_init(void)
{
	int ret;

	ret = crypto_register_alg(&alg);
	if (ret)
		return ret;

	ret = crypto_register_scomp(&scomp);
	if (ret) {
		crypto_unregister_alg(&alg);
		return ret;
	}

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
giovanni cabiddu giovanni cabiddu 38 71.70% 1 33.33%
james morris james morris 14 26.42% 1 33.33%
kamalesh babulal kamalesh babulal 1 1.89% 1 33.33%
Total 53 100.00% 3 100.00%



static void __exit deflate_mod_fini(void)
{
	crypto_unregister_alg(&alg);
	crypto_unregister_scomp(&scomp);
}

Contributors
Person Tokens Prop Commits CommitProp
james morris james morris 14 66.67% 1 33.33%
giovanni cabiddu giovanni cabiddu 6 28.57% 1 33.33%
kamalesh babulal kamalesh babulal 1 4.76% 1 33.33%
Total 21 100.00% 3 100.00%


module_init(deflate_mod_init);

module_exit(deflate_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Deflate Compression Algorithm for IPCOMP");
MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
MODULE_ALIAS_CRYPTO("deflate");
Overall Contributors
Person Tokens Prop Commits CommitProp
james morris james morris 778 60.64% 3 23.08%
giovanni cabiddu giovanni cabiddu 441 34.37% 1 7.69%
herbert xu herbert xu 28 2.18% 2 15.38%
artem bityutskiy artem bityutskiy 16 1.25% 1 7.69%
james keniston james keniston 6 0.47% 1 7.69%
kees cook kees cook 5 0.39% 1 7.69%
kamalesh babulal kamalesh babulal 4 0.31% 1 7.69%
david s. miller david s. miller 3 0.23% 1 7.69%
richard hartmann richard hartmann 1 0.08% 1 7.69%
joe perches joe perches 1 0.08% 1 7.69%
Total 1283 100.00% 13 100.00%
Directory: crypto

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
james morris	james morris	102	93.58%	1	33.33%
james keniston	james keniston	6	5.50%	1	33.33%
joe perches	joe perches	1	0.92%	1	33.33%
	Total	109	100.00%	3	100.00%
cregit-Linux how code gets into the kernel

Release 4.10 crypto/deflate.c

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