Release 4.18 crypto/deflate.c
/*
* 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 format)
{
int ret = 0;
struct z_stream_s *stream = &ctx->comp_stream;
stream->workspace = vzalloc(zlib_deflate_workspacesize(
MAX_WBITS, MAX_MEM_LEVEL));
if (!stream->workspace) {
ret = -ENOMEM;
goto out;
}
if (format)
ret = zlib_deflateInit(stream, 3);
else
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 | 102 | 81.60% | 1 | 25.00% |
Giovanni Cabiddu | 19 | 15.20% | 1 | 25.00% |
James Keniston | 3 | 2.40% | 1 | 25.00% |
Joe Perches | 1 | 0.80% | 1 | 25.00% |
Total | 125 | 100.00% | 4 | 100.00% |
static int deflate_decomp_init(struct deflate_ctx *ctx, int format)
{
int ret = 0;
struct z_stream_s *stream = &ctx->decomp_stream;
stream->workspace = vzalloc(zlib_inflate_workspacesize());
if (!stream->workspace) {
ret = -ENOMEM;
goto out;
}
if (format)
ret = zlib_inflateInit(stream);
else
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 | 94 | 84.68% | 1 | 33.33% |
Giovanni Cabiddu | 15 | 13.51% | 1 | 33.33% |
David S. Miller | 2 | 1.80% | 1 | 33.33% |
Total | 111 | 100.00% | 3 | 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 | 20 | 71.43% | 1 | 50.00% |
Artem B. 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 | 19 | 67.86% | 1 | 33.33% |
Artem B. Bityutskiy | 8 | 28.57% | 1 | 33.33% |
David S. Miller | 1 | 3.57% | 1 | 33.33% |
Total | 28 | 100.00% | 3 | 100.00% |
static int __deflate_init(void *ctx, int format)
{
int ret;
ret = deflate_comp_init(ctx, format);
if (ret)
goto out;
ret = deflate_decomp_init(ctx, format);
if (ret)
deflate_comp_exit(ctx);
out:
return ret;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
James Morris | 45 | 81.82% | 1 | 33.33% |
Giovanni Cabiddu | 10 | 18.18% | 2 | 66.67% |
Total | 55 | 100.00% | 3 | 100.00% |
static void *gen_deflate_alloc_ctx(struct crypto_scomp *tfm, int format)
{
struct deflate_ctx *ctx;
int ret;
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return ERR_PTR(-ENOMEM);
ret = __deflate_init(ctx, format);
if (ret) {
kfree(ctx);
return ERR_PTR(ret);
}
return ctx;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Giovanni Cabiddu | 75 | 97.40% | 2 | 66.67% |
James Morris | 2 | 2.60% | 1 | 33.33% |
Total | 77 | 100.00% | 3 | 100.00% |
static void *deflate_alloc_ctx(struct crypto_scomp *tfm)
{
return gen_deflate_alloc_ctx(tfm, 0);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Giovanni Cabiddu | 20 | 100.00% | 1 | 100.00% |
Total | 20 | 100.00% | 1 | 100.00% |
static void *zlib_deflate_alloc_ctx(struct crypto_scomp *tfm)
{
return gen_deflate_alloc_ctx(tfm, 1);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Giovanni Cabiddu | 20 | 100.00% | 1 | 100.00% |
Total | 20 | 100.00% | 1 | 100.00% |
static int deflate_init(struct crypto_tfm *tfm)
{
struct deflate_ctx *ctx = crypto_tfm_ctx(tfm);
return __deflate_init(ctx, 0);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Herbert Xu | 13 | 44.83% | 1 | 25.00% |
Giovanni Cabiddu | 12 | 41.38% | 2 | 50.00% |
James Morris | 4 | 13.79% | 1 | 25.00% |
Total | 29 | 100.00% | 4 | 100.00% |
static void __deflate_exit(void *ctx)
{
deflate_comp_exit(ctx);
deflate_decomp_exit(ctx);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
James Morris | 11 | 55.00% | 1 | 50.00% |
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 | 19 | 76.00% | 1 | 33.33% |
James Morris | 4 | 16.00% | 1 | 33.33% |
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 | 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 | 138 | 93.88% | 1 | 50.00% |
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 | 26 | 49.06% | 1 | 33.33% |
James Morris | 24 | 45.28% | 1 | 33.33% |
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 | 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 | 164 | 85.42% | 2 | 66.67% |
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 | 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 | 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,
}
}, {
.alloc_ctx = zlib_deflate_alloc_ctx,
.free_ctx = deflate_free_ctx,
.compress = deflate_scompress,
.decompress = deflate_sdecompress,
.base = {
.cra_name = "zlib-deflate",
.cra_driver_name = "zlib-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_scomps(scomp, ARRAY_SIZE(scomp));
if (ret) {
crypto_unregister_alg(&alg);
return ret;
}
return ret;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Giovanni Cabiddu | 42 | 73.68% | 2 | 50.00% |
James Morris | 14 | 24.56% | 1 | 25.00% |
Kamalesh Babulal | 1 | 1.75% | 1 | 25.00% |
Total | 57 | 100.00% | 4 | 100.00% |
static void __exit deflate_mod_fini(void)
{
crypto_unregister_alg(&alg);
crypto_unregister_scomps(scomp, ARRAY_SIZE(scomp));
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
James Morris | 14 | 56.00% | 1 | 25.00% |
Giovanni Cabiddu | 10 | 40.00% | 2 | 50.00% |
Kamalesh Babulal | 1 | 4.00% | 1 | 25.00% |
Total | 25 | 100.00% | 4 | 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 | 778 | 54.75% | 3 | 21.43% |
Giovanni Cabiddu | 582 | 40.96% | 2 | 14.29% |
Herbert Xu | 28 | 1.97% | 2 | 14.29% |
Artem B. Bityutskiy | 16 | 1.13% | 1 | 7.14% |
Kees Cook | 5 | 0.35% | 1 | 7.14% |
Kamalesh Babulal | 4 | 0.28% | 1 | 7.14% |
David S. Miller | 3 | 0.21% | 1 | 7.14% |
James Keniston | 3 | 0.21% | 1 | 7.14% |
Richard Hartmann | 1 | 0.07% | 1 | 7.14% |
Joe Perches | 1 | 0.07% | 1 | 7.14% |
Total | 1421 | 100.00% | 14 | 100.00% |
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