Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 340 insertions, 0 deletions

diff --git a/crypto/deflate.c b/crypto/deflate.c
new file mode 100644
index 0000000000..b2a46f6dc9
--- /dev/null
+++ b/crypto/deflate.c
@@ -0,0 +1,340 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * 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>
+ *
+ * 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;
+}
+
+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;
+}
+
+static void deflate_comp_exit(struct deflate_ctx *ctx)
+{
+	zlib_deflateEnd(&ctx->comp_stream);
+	vfree(ctx->comp_stream.workspace);
+}
+
+static void deflate_decomp_exit(struct deflate_ctx *ctx)
+{
+	zlib_inflateEnd(&ctx->decomp_stream);
+	vfree(ctx->decomp_stream.workspace);
+}
+
+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;
+}
+
+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;
+}
+
+static void *deflate_alloc_ctx(struct crypto_scomp *tfm)
+{
+	return gen_deflate_alloc_ctx(tfm, 0);
+}
+
+static void *zlib_deflate_alloc_ctx(struct crypto_scomp *tfm)
+{
+	return gen_deflate_alloc_ctx(tfm, 1);
+}
+
+static int deflate_init(struct crypto_tfm *tfm)
+{
+	struct deflate_ctx *ctx = crypto_tfm_ctx(tfm);
+
+	return __deflate_init(ctx, 0);
+}
+
+static void __deflate_exit(void *ctx)
+{
+	deflate_comp_exit(ctx);
+	deflate_decomp_exit(ctx);
+}
+
+static void deflate_free_ctx(struct crypto_scomp *tfm, void *ctx)
+{
+	__deflate_exit(ctx);
+	kfree_sensitive(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 = 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;
+}
+
+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 = 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;
+}
+
+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_driver_name	= "deflate-generic",
+	.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;
+}
+
+static void __exit deflate_mod_fini(void)
+{
+	crypto_unregister_alg(&alg);
+	crypto_unregister_scomps(scomp, ARRAY_SIZE(scomp));
+}
+
+subsys_initcall(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");