Now, new compression APIs are introduced and it has some benefits.
Let's support it.
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
---
crypto/Kconfig | 1 +
crypto/deflate.c | 110 ++++++++++++++++++++++++++++++++++++++++++++++++++-----
2 files changed, 101 insertions(+), 10 deletions(-)
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 351b859..728f88e 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -1492,6 +1492,7 @@ config CRYPTO_DEFLATE
select CRYPTO_ALGAPI
select ZLIB_INFLATE
select ZLIB_DEFLATE
+ select CRYPTO_COMPRESS2
help
This is the Deflate algorithm (RFC1951), specified for use in
IPSec with the IPCOMP protocol (RFC3173, RFC2394).
diff --git a/crypto/deflate.c b/crypto/deflate.c
index 95d8d37..1f8f633 100644
--- a/crypto/deflate.c
+++ b/crypto/deflate.c
@@ -33,6 +33,8 @@
#include <linux/mm.h>
#include <linux/net.h>
+#include <crypto/compress.h>
+
#define DEFLATE_DEF_LEVEL Z_DEFAULT_COMPRESSION
#define DEFLATE_DEF_WINBITS 11
#define DEFLATE_DEF_MEMLEVEL MAX_MEM_LEVEL
@@ -101,9 +103,8 @@ static void deflate_decomp_exit(struct deflate_ctx *ctx)
vfree(ctx->decomp_stream.workspace);
}
-static int deflate_init(struct crypto_tfm *tfm)
+static int __deflate_init(void *ctx)
{
- struct deflate_ctx *ctx = crypto_tfm_ctx(tfm);
int ret;
ret = deflate_comp_init(ctx);
@@ -116,19 +117,54 @@ out:
return ret;
}
-static void deflate_exit(struct crypto_tfm *tfm)
+static void *deflate_alloc_ctx(struct crypto_scomp *tfm)
+{
+ void *ctx;
+ int ret;
+
+ ctx = kzalloc(sizeof(struct deflate_ctx), GFP_KERNEL);
+ if (!ctx)
+ return ERR_PTR(-ENOMEM);
+
+ ret = __deflate_init(ctx);
+ if (ret) {
+ kfree(ctx);
+ return ERR_PTR(ret);
+ }
+
+ return ctx;
+}
+
+static int deflate_init(struct crypto_tfm *tfm)
{
struct deflate_ctx *ctx = crypto_tfm_ctx(tfm);
+ return __deflate_init(ctx);
+}
+
+static void __deflate_exit(void *ctx)
+{
deflate_comp_exit(ctx);
deflate_decomp_exit(ctx);
}
-static int deflate_compress(struct crypto_tfm *tfm, const u8 *src,
- unsigned int slen, u8 *dst, unsigned int *dlen)
+static void deflate_free_ctx(struct crypto_scomp *tfm, void *ctx)
+{
+ __deflate_exit(ctx);
+}
+
+static void deflate_exit(struct crypto_tfm *tfm)
+{
+ struct deflate_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ __deflate_exit(ctx);
+}
+
+static int __deflate_compress(const u8 *src, unsigned int slen,
+ u8 *dst, unsigned int *dlen, void *ctx)
{
int ret = 0;
- struct deflate_ctx *dctx = crypto_tfm_ctx(tfm);
+ struct deflate_ctx *dctx = ctx;
struct z_stream_s *stream = &dctx->comp_stream;
ret = zlib_deflateReset(stream);
@@ -153,12 +189,26 @@ out:
return ret;
}
-static int deflate_decompress(struct crypto_tfm *tfm, const u8 *src,
- unsigned int slen, u8 *dst, unsigned int *dlen)
+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);
+}
+
+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);
+}
+
+static int __deflate_decompress(const u8 *src, unsigned int slen,
+ u8 *dst, unsigned int *dlen, void *ctx)
{
int ret = 0;
- struct deflate_ctx *dctx = crypto_tfm_ctx(tfm);
+ struct deflate_ctx *dctx = ctx;
struct z_stream_s *stream = &dctx->decomp_stream;
ret = zlib_inflateReset(stream);
@@ -194,6 +244,20 @@ out:
return ret;
}
+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);
+}
+
+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);
+}
+
static struct crypto_alg alg = {
.cra_name = "deflate",
.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
@@ -206,14 +270,40 @@ static struct crypto_alg alg = {
.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_flags = CRYPTO_ALG_TYPE_SCOMPRESS,
+ .cra_module = THIS_MODULE,
+ }
+};
+
static int __init deflate_mod_init(void)
{
- return crypto_register_alg(&alg);
+ 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;
}
static void __exit deflate_mod_fini(void)
{
crypto_unregister_alg(&alg);
+ crypto_unregister_scomp(&scomp);
}
module_init(deflate_mod_init);
--
1.9.1
--
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