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![Herbert Xu](/assets/img/avatar_default.png)
This patch adds the hooks cra_init/cra_exit which are called during a tfm's construction and destruction respectively. This will be used by the instances to allocate child tfm's. For now this lets us get rid of the coa_init/coa_exit functions which are used for exactly that purpose (unlike the dia_init function which is called for each transaction). In fact the coa_exit path is currently buggy as it may get called twice when an error is encountered during initialisation. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
227 lines
5.4 KiB
C
227 lines
5.4 KiB
C
/*
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* Cryptographic API.
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*
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* Deflate algorithm (RFC 1951), implemented here primarily for use
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* by IPCOMP (RFC 3173 & RFC 2394).
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*
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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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* The default winbits of 11 should suit most packets, and it may be something
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* to configure on a per-tfm basis in the future.
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*
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* Currently, compression history is not maintained between tfm calls, as
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* it is not needed for IPCOMP and keeps the code simpler. It can be
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* implemented if someone wants it.
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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/crypto.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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#include <linux/slab.h>
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#define DEFLATE_DEF_LEVEL Z_DEFAULT_COMPRESSION
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#define DEFLATE_DEF_WINBITS 11
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#define DEFLATE_DEF_MEMLEVEL MAX_MEM_LEVEL
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struct deflate_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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};
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static int deflate_comp_init(struct deflate_ctx *ctx)
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{
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int ret = 0;
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struct z_stream_s *stream = &ctx->comp_stream;
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stream->workspace = vmalloc(zlib_deflate_workspacesize());
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if (!stream->workspace ) {
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ret = -ENOMEM;
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goto out;
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}
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memset(stream->workspace, 0, zlib_deflate_workspacesize());
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ret = zlib_deflateInit2(stream, DEFLATE_DEF_LEVEL, Z_DEFLATED,
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-DEFLATE_DEF_WINBITS, DEFLATE_DEF_MEMLEVEL,
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Z_DEFAULT_STRATEGY);
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if (ret != Z_OK) {
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ret = -EINVAL;
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goto out_free;
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}
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out:
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return ret;
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out_free:
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vfree(stream->workspace);
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goto out;
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}
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static int deflate_decomp_init(struct deflate_ctx *ctx)
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{
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int ret = 0;
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struct z_stream_s *stream = &ctx->decomp_stream;
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stream->workspace = kzalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
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if (!stream->workspace ) {
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ret = -ENOMEM;
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goto out;
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}
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ret = zlib_inflateInit2(stream, -DEFLATE_DEF_WINBITS);
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if (ret != Z_OK) {
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ret = -EINVAL;
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goto out_free;
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}
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out:
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return ret;
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out_free:
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kfree(stream->workspace);
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goto out;
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}
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static void deflate_comp_exit(struct deflate_ctx *ctx)
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{
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zlib_deflateEnd(&ctx->comp_stream);
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vfree(ctx->comp_stream.workspace);
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}
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static void deflate_decomp_exit(struct deflate_ctx *ctx)
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{
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zlib_inflateEnd(&ctx->decomp_stream);
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kfree(ctx->decomp_stream.workspace);
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}
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static int deflate_init(struct crypto_tfm *tfm)
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{
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struct deflate_ctx *ctx = crypto_tfm_ctx(tfm);
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int ret;
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ret = deflate_comp_init(ctx);
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if (ret)
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goto out;
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ret = deflate_decomp_init(ctx);
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if (ret)
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deflate_comp_exit(ctx);
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out:
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return ret;
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}
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static void deflate_exit(struct crypto_tfm *tfm)
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{
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struct deflate_ctx *ctx = crypto_tfm_ctx(tfm);
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deflate_comp_exit(ctx);
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deflate_decomp_exit(ctx);
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}
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static int deflate_compress(struct crypto_tfm *tfm, const u8 *src,
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unsigned int slen, u8 *dst, unsigned int *dlen)
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{
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int ret = 0;
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struct deflate_ctx *dctx = crypto_tfm_ctx(tfm);
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struct z_stream_s *stream = &dctx->comp_stream;
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ret = zlib_deflateReset(stream);
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if (ret != Z_OK) {
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ret = -EINVAL;
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goto out;
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}
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stream->next_in = (u8 *)src;
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stream->avail_in = slen;
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stream->next_out = (u8 *)dst;
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stream->avail_out = *dlen;
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ret = zlib_deflate(stream, Z_FINISH);
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if (ret != Z_STREAM_END) {
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ret = -EINVAL;
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goto out;
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}
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ret = 0;
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*dlen = stream->total_out;
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out:
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return ret;
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}
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static int deflate_decompress(struct crypto_tfm *tfm, const u8 *src,
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unsigned int slen, u8 *dst, unsigned int *dlen)
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{
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int ret = 0;
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struct deflate_ctx *dctx = crypto_tfm_ctx(tfm);
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struct z_stream_s *stream = &dctx->decomp_stream;
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ret = zlib_inflateReset(stream);
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if (ret != Z_OK) {
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ret = -EINVAL;
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goto out;
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}
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stream->next_in = (u8 *)src;
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stream->avail_in = slen;
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stream->next_out = (u8 *)dst;
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stream->avail_out = *dlen;
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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 extra
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* byte when being used in the (undocumented) raw deflate mode.
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* (From USAGI).
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*/
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if (ret == Z_OK && !stream->avail_in && stream->avail_out) {
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u8 zerostuff = 0;
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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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}
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if (ret != Z_STREAM_END) {
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ret = -EINVAL;
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goto out;
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}
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ret = 0;
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*dlen = stream->total_out;
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out:
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return ret;
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}
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static struct crypto_alg alg = {
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.cra_name = "deflate",
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.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
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.cra_ctxsize = sizeof(struct deflate_ctx),
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(alg.cra_list),
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.cra_init = deflate_init,
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.cra_exit = deflate_exit,
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.cra_u = { .compress = {
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.coa_compress = deflate_compress,
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.coa_decompress = deflate_decompress } }
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};
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static int __init init(void)
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{
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return crypto_register_alg(&alg);
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}
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static void __exit fini(void)
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{
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crypto_unregister_alg(&alg);
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}
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module_init(init);
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module_exit(fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Deflate Compression Algorithm for IPCOMP");
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MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
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