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@@ -1,381 +0,0 @@
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-/*
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- * Cryptographic API.
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- *
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- * Zlib algorithm
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- *
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- * Copyright 2008 Sony Corporation
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- *
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- * Based on deflate.c, which is
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- * Copyright (c) 2003 James Morris <jmorris@intercode.com.au>
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms of the GNU General Public License as published by the Free
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- * Software Foundation; either version 2 of the License, or (at your option)
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- * any later version.
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- *
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- * FIXME: deflate transforms will require up to a total of about 436k of kernel
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- * memory on i386 (390k for compression, the rest for decompression), as the
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- * current zlib kernel code uses a worst case pre-allocation system by default.
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- * This needs to be fixed so that the amount of memory required is properly
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- * related to the winbits and memlevel parameters.
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- */
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-
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-#define pr_fmt(fmt) "%s: " fmt, __func__
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-
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-#include <linux/init.h>
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-#include <linux/module.h>
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-#include <linux/zlib.h>
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-#include <linux/vmalloc.h>
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-#include <linux/interrupt.h>
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-#include <linux/mm.h>
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-#include <linux/net.h>
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-
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-#include <crypto/internal/compress.h>
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-
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-#include <net/netlink.h>
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-
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-
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-struct zlib_ctx {
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- struct z_stream_s comp_stream;
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- struct z_stream_s decomp_stream;
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- int decomp_windowBits;
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-};
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-
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-
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-static void zlib_comp_exit(struct zlib_ctx *ctx)
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-{
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- struct z_stream_s *stream = &ctx->comp_stream;
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-
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- if (stream->workspace) {
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- zlib_deflateEnd(stream);
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- vfree(stream->workspace);
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- stream->workspace = NULL;
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- }
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-}
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-
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-static void zlib_decomp_exit(struct zlib_ctx *ctx)
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-{
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- struct z_stream_s *stream = &ctx->decomp_stream;
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-
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- if (stream->workspace) {
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- zlib_inflateEnd(stream);
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- vfree(stream->workspace);
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- stream->workspace = NULL;
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- }
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-}
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-
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-static int zlib_init(struct crypto_tfm *tfm)
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-{
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- return 0;
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-}
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-
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-static void zlib_exit(struct crypto_tfm *tfm)
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-{
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- struct zlib_ctx *ctx = crypto_tfm_ctx(tfm);
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-
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- zlib_comp_exit(ctx);
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- zlib_decomp_exit(ctx);
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-}
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-
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-
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-static int zlib_compress_setup(struct crypto_pcomp *tfm, const void *params,
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- unsigned int len)
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-{
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- struct zlib_ctx *ctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
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- struct z_stream_s *stream = &ctx->comp_stream;
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- struct nlattr *tb[ZLIB_COMP_MAX + 1];
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- int window_bits, mem_level;
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- size_t workspacesize;
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- int ret;
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-
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- ret = nla_parse(tb, ZLIB_COMP_MAX, params, len, NULL);
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- if (ret)
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- return ret;
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-
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- zlib_comp_exit(ctx);
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-
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- window_bits = tb[ZLIB_COMP_WINDOWBITS]
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- ? nla_get_u32(tb[ZLIB_COMP_WINDOWBITS])
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- : MAX_WBITS;
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- mem_level = tb[ZLIB_COMP_MEMLEVEL]
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- ? nla_get_u32(tb[ZLIB_COMP_MEMLEVEL])
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- : DEF_MEM_LEVEL;
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-
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- workspacesize = zlib_deflate_workspacesize(window_bits, mem_level);
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- stream->workspace = vzalloc(workspacesize);
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- if (!stream->workspace)
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- return -ENOMEM;
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-
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- ret = zlib_deflateInit2(stream,
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- tb[ZLIB_COMP_LEVEL]
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- ? nla_get_u32(tb[ZLIB_COMP_LEVEL])
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- : Z_DEFAULT_COMPRESSION,
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- tb[ZLIB_COMP_METHOD]
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- ? nla_get_u32(tb[ZLIB_COMP_METHOD])
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- : Z_DEFLATED,
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- window_bits,
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- mem_level,
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- tb[ZLIB_COMP_STRATEGY]
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- ? nla_get_u32(tb[ZLIB_COMP_STRATEGY])
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- : Z_DEFAULT_STRATEGY);
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- if (ret != Z_OK) {
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- vfree(stream->workspace);
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- stream->workspace = NULL;
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- return -EINVAL;
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- }
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-
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- return 0;
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-}
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-
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-static int zlib_compress_init(struct crypto_pcomp *tfm)
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-{
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- int ret;
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- struct zlib_ctx *dctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
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- struct z_stream_s *stream = &dctx->comp_stream;
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-
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- ret = zlib_deflateReset(stream);
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- if (ret != Z_OK)
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- return -EINVAL;
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-
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- return 0;
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-}
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-
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-static int zlib_compress_update(struct crypto_pcomp *tfm,
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- struct comp_request *req)
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-{
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- int ret;
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- struct zlib_ctx *dctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
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- struct z_stream_s *stream = &dctx->comp_stream;
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-
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- pr_debug("avail_in %u, avail_out %u\n", req->avail_in, req->avail_out);
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- stream->next_in = req->next_in;
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- stream->avail_in = req->avail_in;
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- stream->next_out = req->next_out;
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- stream->avail_out = req->avail_out;
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-
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- ret = zlib_deflate(stream, Z_NO_FLUSH);
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- switch (ret) {
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- case Z_OK:
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- break;
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-
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- case Z_BUF_ERROR:
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- pr_debug("zlib_deflate could not make progress\n");
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- return -EAGAIN;
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-
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- default:
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- pr_debug("zlib_deflate failed %d\n", ret);
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- return -EINVAL;
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- }
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-
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- ret = req->avail_out - stream->avail_out;
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- pr_debug("avail_in %lu, avail_out %lu (consumed %lu, produced %u)\n",
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- stream->avail_in, stream->avail_out,
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- req->avail_in - stream->avail_in, ret);
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- req->next_in = stream->next_in;
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- req->avail_in = stream->avail_in;
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- req->next_out = stream->next_out;
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- req->avail_out = stream->avail_out;
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- return ret;
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-}
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-
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-static int zlib_compress_final(struct crypto_pcomp *tfm,
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- struct comp_request *req)
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-{
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- int ret;
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- struct zlib_ctx *dctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
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- struct z_stream_s *stream = &dctx->comp_stream;
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-
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- pr_debug("avail_in %u, avail_out %u\n", req->avail_in, req->avail_out);
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- stream->next_in = req->next_in;
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- stream->avail_in = req->avail_in;
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- stream->next_out = req->next_out;
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- stream->avail_out = req->avail_out;
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-
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- ret = zlib_deflate(stream, Z_FINISH);
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- if (ret != Z_STREAM_END) {
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- pr_debug("zlib_deflate failed %d\n", ret);
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- return -EINVAL;
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- }
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-
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- ret = req->avail_out - stream->avail_out;
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- pr_debug("avail_in %lu, avail_out %lu (consumed %lu, produced %u)\n",
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- stream->avail_in, stream->avail_out,
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- req->avail_in - stream->avail_in, ret);
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- req->next_in = stream->next_in;
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- req->avail_in = stream->avail_in;
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- req->next_out = stream->next_out;
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- req->avail_out = stream->avail_out;
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- return ret;
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-}
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-
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-
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-static int zlib_decompress_setup(struct crypto_pcomp *tfm, const void *params,
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- unsigned int len)
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-{
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- struct zlib_ctx *ctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
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- struct z_stream_s *stream = &ctx->decomp_stream;
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- struct nlattr *tb[ZLIB_DECOMP_MAX + 1];
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- int ret = 0;
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-
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- ret = nla_parse(tb, ZLIB_DECOMP_MAX, params, len, NULL);
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- if (ret)
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- return ret;
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-
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- zlib_decomp_exit(ctx);
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-
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- ctx->decomp_windowBits = tb[ZLIB_DECOMP_WINDOWBITS]
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- ? nla_get_u32(tb[ZLIB_DECOMP_WINDOWBITS])
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- : DEF_WBITS;
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-
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- stream->workspace = vzalloc(zlib_inflate_workspacesize());
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- if (!stream->workspace)
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- return -ENOMEM;
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-
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- ret = zlib_inflateInit2(stream, ctx->decomp_windowBits);
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- if (ret != Z_OK) {
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- vfree(stream->workspace);
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- stream->workspace = NULL;
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- return -EINVAL;
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- }
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-
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- return 0;
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-}
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-
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-static int zlib_decompress_init(struct crypto_pcomp *tfm)
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-{
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- int ret;
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- struct zlib_ctx *dctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
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- struct z_stream_s *stream = &dctx->decomp_stream;
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-
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- ret = zlib_inflateReset(stream);
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- if (ret != Z_OK)
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- return -EINVAL;
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-
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- return 0;
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-}
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-
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-static int zlib_decompress_update(struct crypto_pcomp *tfm,
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- struct comp_request *req)
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-{
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- int ret;
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- struct zlib_ctx *dctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
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- struct z_stream_s *stream = &dctx->decomp_stream;
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-
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- pr_debug("avail_in %u, avail_out %u\n", req->avail_in, req->avail_out);
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- stream->next_in = req->next_in;
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- stream->avail_in = req->avail_in;
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- stream->next_out = req->next_out;
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- stream->avail_out = req->avail_out;
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-
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- ret = zlib_inflate(stream, Z_SYNC_FLUSH);
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- switch (ret) {
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- case Z_OK:
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- case Z_STREAM_END:
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- break;
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-
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- case Z_BUF_ERROR:
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- pr_debug("zlib_inflate could not make progress\n");
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- return -EAGAIN;
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-
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- default:
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- pr_debug("zlib_inflate failed %d\n", ret);
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- return -EINVAL;
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- }
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-
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- ret = req->avail_out - stream->avail_out;
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- pr_debug("avail_in %lu, avail_out %lu (consumed %lu, produced %u)\n",
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- stream->avail_in, stream->avail_out,
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- req->avail_in - stream->avail_in, ret);
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- req->next_in = stream->next_in;
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- req->avail_in = stream->avail_in;
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- req->next_out = stream->next_out;
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- req->avail_out = stream->avail_out;
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- return ret;
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-}
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-
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-static int zlib_decompress_final(struct crypto_pcomp *tfm,
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- struct comp_request *req)
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-{
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- int ret;
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- struct zlib_ctx *dctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
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- struct z_stream_s *stream = &dctx->decomp_stream;
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-
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- pr_debug("avail_in %u, avail_out %u\n", req->avail_in, req->avail_out);
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- stream->next_in = req->next_in;
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- stream->avail_in = req->avail_in;
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- stream->next_out = req->next_out;
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- stream->avail_out = req->avail_out;
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-
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- if (dctx->decomp_windowBits < 0) {
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- ret = zlib_inflate(stream, Z_SYNC_FLUSH);
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- /*
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- * Work around a bug in zlib, which sometimes wants to taste an
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- * extra byte when being used in the (undocumented) raw deflate
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- * mode. (From USAGI).
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- */
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- if (ret == Z_OK && !stream->avail_in && stream->avail_out) {
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- const void *saved_next_in = stream->next_in;
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- u8 zerostuff = 0;
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-
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- stream->next_in = &zerostuff;
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- stream->avail_in = 1;
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- ret = zlib_inflate(stream, Z_FINISH);
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- stream->next_in = saved_next_in;
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- stream->avail_in = 0;
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- }
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- } else
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- ret = zlib_inflate(stream, Z_FINISH);
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- if (ret != Z_STREAM_END) {
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- pr_debug("zlib_inflate failed %d\n", ret);
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- return -EINVAL;
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- }
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-
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- ret = req->avail_out - stream->avail_out;
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- pr_debug("avail_in %lu, avail_out %lu (consumed %lu, produced %u)\n",
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- stream->avail_in, stream->avail_out,
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- req->avail_in - stream->avail_in, ret);
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- req->next_in = stream->next_in;
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- req->avail_in = stream->avail_in;
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- req->next_out = stream->next_out;
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- req->avail_out = stream->avail_out;
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- return ret;
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-}
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-
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-
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-static struct pcomp_alg zlib_alg = {
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- .compress_setup = zlib_compress_setup,
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- .compress_init = zlib_compress_init,
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- .compress_update = zlib_compress_update,
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- .compress_final = zlib_compress_final,
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- .decompress_setup = zlib_decompress_setup,
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- .decompress_init = zlib_decompress_init,
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- .decompress_update = zlib_decompress_update,
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- .decompress_final = zlib_decompress_final,
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-
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- .base = {
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- .cra_name = "zlib",
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- .cra_flags = CRYPTO_ALG_TYPE_PCOMPRESS,
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- .cra_ctxsize = sizeof(struct zlib_ctx),
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- .cra_module = THIS_MODULE,
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- .cra_init = zlib_init,
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- .cra_exit = zlib_exit,
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- }
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-};
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-
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-static int __init zlib_mod_init(void)
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-{
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- return crypto_register_pcomp(&zlib_alg);
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-}
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-
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-static void __exit zlib_mod_fini(void)
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-{
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- crypto_unregister_pcomp(&zlib_alg);
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-}
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-
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-module_init(zlib_mod_init);
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-module_exit(zlib_mod_fini);
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-
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-MODULE_LICENSE("GPL");
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-MODULE_DESCRIPTION("Zlib Compression Algorithm");
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-MODULE_AUTHOR("Sony Corporation");
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-MODULE_ALIAS_CRYPTO("zlib");
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Joonsoo Kim