From: Geert Uytterhoeven <[email protected]>
Change the "deflate" crypto module from the "comp" to the "pcomp" interface.
Signed-off-by: Geert Uytterhoeven <[email protected]>
Cc: James Morris <[email protected]>
---
crypto/deflate.c | 342 ++++++++++++++++++++++++++++++++++++-------------
include/linux/crypto.h | 12 +
2 files changed, 266 insertions(+), 88 deletions(-)
--- a/crypto/deflate.c
+++ b/crypto/deflate.c
@@ -1,14 +1,15 @@
-/*
+/*
* Cryptographic API.
*
- * Deflate algorithm (RFC 1951), implemented here primarily for use
- * by IPCOMP (RFC 3173 & RFC 2394).
+ * Deflate algorithm (RFC 1951), implemented here for use
+ * by e.g. IPCOMP (RFC 3173 & RFC 2394).
*
* Copyright (c) 2003 James Morris <[email protected]>
- *
+ * Copyright 2008 Sony Corporation
+ *
* 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)
+ * 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
@@ -16,14 +17,10 @@
* 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.
*/
+
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
#include <linux/init.h>
#include <linux/module.h>
#include <linux/crypto.h>
@@ -39,6 +36,7 @@
#define DEFLATE_DEF_MEMLEVEL MAX_MEM_LEVEL
struct deflate_ctx {
+ struct deflate_comp_params params;
struct z_stream_s comp_stream;
struct z_stream_s decomp_stream;
};
@@ -47,24 +45,27 @@ static int deflate_comp_init(struct defl
{
int ret = 0;
struct z_stream_s *stream = &ctx->comp_stream;
+ size_t workspacesize;
- stream->workspace = vmalloc(zlib_deflate_workspacesize());
- if (!stream->workspace ) {
+ workspacesize = zlib_deflate_workspacesize();
+ stream->workspace = vmalloc(workspacesize);
+ if (!stream->workspace) {
ret = -ENOMEM;
goto out;
}
- memset(stream->workspace, 0, zlib_deflate_workspacesize());
- ret = zlib_deflateInit2(stream, DEFLATE_DEF_LEVEL, Z_DEFLATED,
- -DEFLATE_DEF_WINBITS, DEFLATE_DEF_MEMLEVEL,
- Z_DEFAULT_STRATEGY);
+ memset(stream->workspace, 0, workspacesize);
+ ret = zlib_deflateInit2(stream, ctx->params.level, ctx->params.method,
+ ctx->params.windowBits, ctx->params.memLevel,
+ ctx->params.strategy);
if (ret != Z_OK) {
ret = -EINVAL;
goto out_free;
}
-out:
+out:
return ret;
out_free:
vfree(stream->workspace);
+ stream->workspace = NULL;
goto out;
}
@@ -74,11 +75,11 @@ static int deflate_decomp_init(struct de
struct z_stream_s *stream = &ctx->decomp_stream;
stream->workspace = kzalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
- if (!stream->workspace ) {
+ if (!stream->workspace) {
ret = -ENOMEM;
goto out;
}
- ret = zlib_inflateInit2(stream, -DEFLATE_DEF_WINBITS);
+ ret = zlib_inflateInit2(stream, ctx->params.windowBits);
if (ret != Z_OK) {
ret = -EINVAL;
goto out_free;
@@ -87,34 +88,35 @@ out:
return ret;
out_free:
kfree(stream->workspace);
+ stream->workspace = NULL;
goto out;
}
static void deflate_comp_exit(struct deflate_ctx *ctx)
{
- zlib_deflateEnd(&ctx->comp_stream);
- vfree(ctx->comp_stream.workspace);
+ struct z_stream_s *stream = &ctx->comp_stream;
+
+ if (stream->workspace) {
+ zlib_deflateEnd(stream);
+ vfree(stream->workspace);
+ stream->workspace = NULL;
+ }
}
static void deflate_decomp_exit(struct deflate_ctx *ctx)
{
- zlib_inflateEnd(&ctx->decomp_stream);
- kfree(ctx->decomp_stream.workspace);
+ struct z_stream_s *stream = &ctx->decomp_stream;
+
+ if (stream->workspace) {
+ zlib_inflateEnd(stream);
+ kfree(stream->workspace);
+ stream->workspace = NULL;
+ }
}
static int deflate_init(struct crypto_tfm *tfm)
{
- struct deflate_ctx *ctx = crypto_tfm_ctx(tfm);
- 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;
+ return 0;
}
static void deflate_exit(struct crypto_tfm *tfm)
@@ -125,87 +127,251 @@ static void deflate_exit(struct crypto_t
deflate_decomp_exit(ctx);
}
-static int deflate_compress(struct crypto_tfm *tfm, const u8 *src,
- unsigned int slen, u8 *dst, unsigned int *dlen)
+static int deflate_setup(struct crypto_tfm *tfm, const void *params)
{
- int ret = 0;
+ struct deflate_ctx *ctx = crypto_tfm_ctx(tfm);
+ const struct deflate_comp_params *zparams = params;
+ int ret;
+
+ deflate_comp_exit(ctx);
+ deflate_decomp_exit(ctx);
+
+ ctx->params = *zparams;
+
+ if (zparams->enable_comp) {
+ ret = deflate_comp_init(ctx);
+ if (ret)
+ return ret;
+ }
+
+ if (zparams->enable_decomp) {
+ ret = deflate_decomp_init(ctx);
+ if (ret) {
+ deflate_comp_exit(ctx);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+
+static int deflate_compress_update(struct crypto_tfm *tfm,
+ struct comp_request *req)
+{
+ int ret;
struct deflate_ctx *dctx = crypto_tfm_ctx(tfm);
struct z_stream_s *stream = &dctx->comp_stream;
- ret = zlib_deflateReset(stream);
- if (ret != Z_OK) {
- ret = -EINVAL;
- goto out;
+ pr_debug("avail_in %u, avail_out %u\n", req->avail_in, req->avail_out);
+ stream->next_in = req->next_in;
+ stream->avail_in = req->avail_in;
+ stream->next_out = req->next_out;
+ stream->avail_out = req->avail_out;
+
+ ret = zlib_deflate(stream, Z_NO_FLUSH);
+ switch (ret) {
+ case Z_OK:
+ break;
+
+ case Z_BUF_ERROR:
+ pr_debug("zlib_deflate could not make progress\n");
+ return -EAGAIN;
+
+ default:
+ pr_debug("zlib_deflate failed %d\n", ret);
+ return -EINVAL;
}
- stream->next_in = (u8 *)src;
- stream->avail_in = slen;
- stream->next_out = (u8 *)dst;
- stream->avail_out = *dlen;
+ pr_debug("avail_in %u, avail_out %u (consumed %u, produced %u)\n",
+ stream->avail_in, stream->avail_out,
+ req->avail_in - stream->avail_in,
+ req->avail_out - stream->avail_out);
+ req->next_in = stream->next_in;
+ req->avail_in = stream->avail_in;
+ req->next_out = stream->next_out;
+ req->avail_out = stream->avail_out;
+ return 0;
+}
+
+static int deflate_compress_init(struct crypto_tfm *tfm,
+ struct comp_request *req)
+{
+ int ret;
+ struct deflate_ctx *dctx = crypto_tfm_ctx(tfm);
+ struct z_stream_s *stream = &dctx->comp_stream;
+
+ pr_debug("avail_in %u, avail_out %u\n", req->avail_in, req->avail_out);
+ ret = zlib_deflateReset(stream);
+ if (ret != Z_OK)
+ return -EINVAL;
+
+ return deflate_compress_update(tfm, req);
+}
+
+static int deflate_compress_final(struct crypto_tfm *tfm,
+ struct comp_request *req)
+{
+ int ret;
+ struct deflate_ctx *dctx = crypto_tfm_ctx(tfm);
+ struct z_stream_s *stream = &dctx->comp_stream;
+
+ pr_debug("avail_in %u, avail_out %u\n", req->avail_in, req->avail_out);
+ stream->next_in = req->next_in;
+ stream->avail_in = req->avail_in;
+ stream->next_out = req->next_out;
+ stream->avail_out = req->avail_out;
ret = zlib_deflate(stream, Z_FINISH);
if (ret != Z_STREAM_END) {
- ret = -EINVAL;
- goto out;
+ pr_debug("zlib_deflate failed %d\n", ret);
+ return -EINVAL;
}
- ret = 0;
- *dlen = stream->total_out;
-out:
- return ret;
+
+ pr_debug("avail_in %u, avail_out %u (consumed %u, produced %u)\n",
+ stream->avail_in, stream->avail_out,
+ req->avail_in - stream->avail_in,
+ req->avail_out - stream->avail_out);
+ req->next_in = stream->next_in;
+ req->avail_in = stream->avail_in;
+ req->next_out = stream->next_out;
+ req->avail_out = stream->avail_out;
+ return 0;
}
-
-static int deflate_decompress(struct crypto_tfm *tfm, const u8 *src,
- unsigned int slen, u8 *dst, unsigned int *dlen)
+
+static int deflate_decompress_update(struct crypto_tfm *tfm,
+ struct comp_request *req)
{
-
- int ret = 0;
+ int ret;
struct deflate_ctx *dctx = crypto_tfm_ctx(tfm);
struct z_stream_s *stream = &dctx->decomp_stream;
- ret = zlib_inflateReset(stream);
- if (ret != Z_OK) {
- ret = -EINVAL;
- goto out;
+ pr_debug("avail_in %u, avail_out %u\n", req->avail_in, req->avail_out);
+ stream->next_in = req->next_in;
+ stream->avail_in = req->avail_in;
+ stream->next_out = req->next_out;
+ stream->avail_out = req->avail_out;
+
+ ret = zlib_inflate(stream, Z_SYNC_FLUSH);
+ switch (ret) {
+ case Z_OK:
+ case Z_STREAM_END:
+ break;
+
+ case Z_BUF_ERROR:
+ pr_debug("zlib_inflate could not make progress\n");
+ return -EAGAIN;
+
+ default:
+ pr_debug("zlib_inflate failed %d\n", ret);
+ return -EINVAL;
}
- stream->next_in = (u8 *)src;
- stream->avail_in = slen;
- stream->next_out = (u8 *)dst;
- stream->avail_out = *dlen;
+ pr_debug("avail_in %u, avail_out %u (consumed %u, produced %u)\n",
+ stream->avail_in, stream->avail_out,
+ req->avail_in - stream->avail_in,
+ req->avail_out - stream->avail_out);
+ req->next_in = stream->next_in;
+ req->avail_in = stream->avail_in;
+ req->next_out = stream->next_out;
+ req->avail_out = stream->avail_out;
+ return 0;
+}
- 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;
+static int deflate_decompress_init(struct crypto_tfm *tfm,
+ struct comp_request *req)
+{
+ int ret;
+ struct deflate_ctx *dctx = crypto_tfm_ctx(tfm);
+ struct z_stream_s *stream = &dctx->decomp_stream;
+
+ pr_debug("avail_in %u, avail_out %u\n", req->avail_in, req->avail_out);
+ ret = zlib_inflateReset(stream);
+ if (ret != Z_OK)
+ return -EINVAL;
+
+ return deflate_decompress_update(tfm, req);
+}
+
+static int deflate_decompress_final(struct crypto_tfm *tfm,
+ struct comp_request *req)
+{
+ int ret;
+ struct deflate_ctx *dctx = crypto_tfm_ctx(tfm);
+ struct z_stream_s *stream = &dctx->decomp_stream;
+
+ pr_debug("avail_in %u, avail_out %u\n", req->avail_in, req->avail_out);
+ stream->next_in = req->next_in;
+ stream->avail_in = req->avail_in;
+ stream->next_out = req->next_out;
+ stream->avail_out = req->avail_out;
+
+ if (dctx->params.windowBits < 0) {
+ 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) {
+ const void *saved_next_in = stream->next_in;
+ u8 zerostuff = 0;
+
+ stream->next_in = &zerostuff;
+ stream->avail_in = 1;
+ ret = zlib_inflate(stream, Z_FINISH);
+ stream->next_in = saved_next_in;
+ stream->avail_in = 0;
+ }
+ } else
ret = zlib_inflate(stream, Z_FINISH);
- }
if (ret != Z_STREAM_END) {
- ret = -EINVAL;
- goto out;
+ pr_debug("zlib_inflate failed %d\n", ret);
+ return -EINVAL;
}
- ret = 0;
- *dlen = stream->total_out;
-out:
- return ret;
+
+ pr_debug("avail_in %u, avail_out %u (consumed %u, produced %u)\n",
+ stream->avail_in, stream->avail_out,
+ req->avail_in - stream->avail_in,
+ req->avail_out - stream->avail_out);
+ req->next_in = stream->next_in;
+ req->avail_in = stream->avail_in;
+ req->next_out = stream->next_out;
+ req->avail_out = stream->avail_out;
+ return 0;
}
+
+static const struct deflate_comp_params deflate_default_params = {
+ .enable_comp = 1,
+ .enable_decomp = 1,
+ .windowBits = -DEFLATE_DEF_WINBITS,
+ .level = DEFLATE_DEF_LEVEL,
+ .method = Z_DEFLATED,
+ .memLevel = DEFLATE_DEF_MEMLEVEL,
+ .strategy = Z_DEFAULT_STRATEGY
+};
+
static struct crypto_alg alg = {
.cra_name = "deflate",
- .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
+ .cra_flags = CRYPTO_ALG_TYPE_PCOMPRESS,
.cra_ctxsize = sizeof(struct deflate_ctx),
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(alg.cra_list),
.cra_init = deflate_init,
.cra_exit = deflate_exit,
- .cra_u = { .compress = {
- .coa_compress = deflate_compress,
- .coa_decompress = deflate_decompress } }
+ .cra_u = {
+ .pcompress = {
+ .coa_setup = deflate_setup,
+ .coa_compress_init = deflate_compress_init,
+ .coa_compress_update = deflate_compress_update,
+ .coa_compress_final = deflate_compress_final,
+ .coa_decompress_init = deflate_decompress_init,
+ .coa_decompress_update = deflate_decompress_update,
+ .coa_decompress_final = deflate_decompress_final,
+ .coa_default_params = &deflate_default_params
+ }
+ }
};
static int __init deflate_mod_init(void)
@@ -222,6 +388,6 @@ module_init(deflate_mod_init);
module_exit(deflate_mod_fini);
MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("Deflate Compression Algorithm for IPCOMP");
+MODULE_DESCRIPTION("Deflate Compression Algorithm");
MODULE_AUTHOR("James Morris <[email protected]>");
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -311,6 +311,18 @@ struct compress_alg {
unsigned int slen, u8 *dst, unsigned int *dlen);
};
+struct deflate_comp_params {
+ unsigned int enable_comp:1;
+ unsigned int enable_decomp:1;
+ /* common (de)compression (deflate and inflate) parameters */
+ int windowBits; /* e.g. MAX_WBITS or DEF_WBITS */
+ /* compression only (deflate) parameters */
+ int level; /* e.g. Z_DEFAULT_COMPRESSION */
+ int method; /* e.g. Z_DEFLATED */
+ int memLevel; /* e.g. DEF_MEM_LEVEL */
+ int strategy /* e.g. Z_DEFAULT_STRATEGY */;
+};
+
struct pcompress_alg {
int (*coa_setup)(struct crypto_tfm *tfm, const void *params);
int (*coa_compress_init)(struct crypto_tfm *tfm,
--
With kind regards,
Geert Uytterhoeven
Software Architect
Sony Techsoft Centre Europe
The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium
Phone: +32 (0)2 700 8453
Fax: +32 (0)2 700 8622
E-mail: [email protected]
Internet: http://www.sony-europe.com/
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