36ea3668b9
Extends the Opencrypto API to allow the destination buffer size to be specified when its not the same size as the input buffer (i.e. for operations like compress and decompress). The crypto_op and crypt_n_op structures gain a u_int dst_len field. The session_op structure gains a comp_alg field to specify a compression algorithm. Moved four ioctls to new ids; CIOCGSESSION, CIOCNGSESSION, CIOCCRYPT, and CIOCNCRYPTM. Added four backward compatible ioctls; OCIOCGSESSION, OCIOCNGSESSION, OCIOCCRYPT, and OCIOCNCRYPTM. Backward compatibility is maintained in ocryptodev.h and ocryptodev.c which implement the original ioctls and set dst_len and comp_alg to 0. Adds user-space access to compression features. Adds software gzip support (CRYPTO_GZIP_COMP). Adds the fast version of crc32 from zlib to libkern. This should be generally useful and provide a place to start normalizing the various crc32 routines in the kernel. The crc32 routine is used in this patch to support GZIP. With input and support from tls@NetBSD.org.
466 lines
12 KiB
C
466 lines
12 KiB
C
/* $NetBSD: deflate.c,v 1.13 2009/03/25 01:26:13 darran Exp $ */
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/* $FreeBSD: src/sys/opencrypto/deflate.c,v 1.1.2.1 2002/11/21 23:34:23 sam Exp $ */
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/* $OpenBSD: deflate.c,v 1.3 2001/08/20 02:45:22 hugh Exp $ */
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/*
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* Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj@wabbitt.org)
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* This file contains a wrapper around the deflate algo compression
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* functions using the zlib library (see net/zlib.{c,h})
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: deflate.c,v 1.13 2009/03/25 01:26:13 darran Exp $");
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#include <sys/types.h>
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#include <sys/malloc.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <net/zlib.h>
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#include <opencrypto/cryptodev.h>
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#include <opencrypto/deflate.h>
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int window_inflate = -1 * MAX_WBITS;
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int window_deflate = -12;
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/*
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* This function takes a block of data and (de)compress it using the deflate
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* algorithm
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*/
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static void *
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ocf_zalloc(void *nil, u_int type, u_int size)
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{
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void *ptr;
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ptr = malloc(type *size, M_CRYPTO_DATA, M_NOWAIT);
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return ptr;
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}
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static void
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ocf_zfree(void *nil, void *ptr)
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{
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free(ptr, M_CRYPTO_DATA);
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}
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u_int32_t
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deflate_global(u_int8_t *data, u_int32_t size, int decomp, u_int8_t **out)
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{
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/* decomp indicates whether we compress (0) or decompress (1) */
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z_stream zbuf;
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u_int8_t *output;
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u_int32_t count, result;
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int error, i = 0, j;
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struct deflate_buf *buf, *tmp;
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size_t len, old_len;
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DPRINTF(("deflate_global: size %d\n", size));
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len = ZBUF;
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buf = malloc(len*sizeof(struct deflate_buf), M_CRYPTO_DATA, M_NOWAIT);
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if (buf == NULL)
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return 0;
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memset(&zbuf, 0, sizeof(z_stream));
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for (j = 0; j < len; j++)
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buf[j].flag = 0;
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zbuf.next_in = data; /* data that is going to be processed */
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zbuf.zalloc = ocf_zalloc;
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zbuf.zfree = ocf_zfree;
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zbuf.opaque = Z_NULL;
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zbuf.avail_in = size; /* Total length of data to be processed */
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if (!decomp) {
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buf[i].out = malloc(size, M_CRYPTO_DATA, M_NOWAIT);
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if (buf[i].out == NULL)
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goto bad;
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buf[i].size = size;
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buf[i].flag = 1;
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i++;
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} else {
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/*
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* Choose a buffer with 4x the size of the input buffer
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* for the size of the output buffer in the case of
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* decompression. If it's not sufficient, it will need to be
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* updated while the decompression is going on
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*/
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buf[i].size = size * 4;
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buf[i].out = malloc(buf[i].size, M_CRYPTO_DATA, M_NOWAIT);
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if (buf[i].out == NULL)
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goto bad;
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buf[i].flag = 1;
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i++;
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}
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zbuf.next_out = buf[0].out;
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zbuf.avail_out = buf[0].size;
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error = decomp ? inflateInit2(&zbuf, window_inflate) :
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deflateInit2(&zbuf, Z_DEFAULT_COMPRESSION, Z_METHOD,
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window_deflate, Z_MEMLEVEL, Z_DEFAULT_STRATEGY);
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if (error != Z_OK)
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goto bad;
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for (;;) {
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error = decomp ? inflate(&zbuf, Z_PARTIAL_FLUSH) :
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deflate(&zbuf, Z_PARTIAL_FLUSH);
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if (error != Z_OK && error != Z_STREAM_END)
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goto bad;
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else if (zbuf.avail_in == 0 && zbuf.avail_out != 0)
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goto end;
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else if (zbuf.avail_out == 0) {
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if (i == (len-1)) {
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old_len = i;
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len += ZBUF;
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tmp = realloc(buf,len*sizeof(struct deflate_buf),
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M_CRYPTO_DATA, M_NOWAIT);
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if (tmp == NULL)
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goto bad;
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buf = tmp;
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for (j = old_len; j < len; j++)
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buf[j].flag = 0;
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}
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/* we need more output space, allocate size */
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buf[i].out = malloc(size, M_CRYPTO_DATA, M_NOWAIT);
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if (buf[i].out == NULL)
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goto bad;
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zbuf.next_out = buf[i].out;
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buf[i].size = size;
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buf[i].flag = 1;
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zbuf.avail_out = buf[i].size;
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i++;
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} else
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goto bad;
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}
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end:
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result = count = zbuf.total_out;
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*out = malloc(result, M_CRYPTO_DATA, M_NOWAIT);
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if (*out == NULL)
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goto bad;
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if (decomp)
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inflateEnd(&zbuf);
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else
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deflateEnd(&zbuf);
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output = *out;
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for (j = 0; buf[j].flag != 0; j++) {
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if (count > buf[j].size) {
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memcpy(*out, buf[j].out, buf[j].size);
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*out += buf[j].size;
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free(buf[j].out, M_CRYPTO_DATA);
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count -= buf[j].size;
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} else {
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/* it should be the last buffer */
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memcpy(*out, buf[j].out, count);
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*out += count;
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free(buf[j].out, M_CRYPTO_DATA);
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count = 0;
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}
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}
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free(buf, M_CRYPTO_DATA);
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*out = output;
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return result;
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bad:
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*out = NULL;
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for (j = 0; buf[j].flag != 0; j++)
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free(buf[j].out, M_CRYPTO_DATA);
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free(buf, M_CRYPTO_DATA);
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if (decomp)
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inflateEnd(&zbuf);
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else
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deflateEnd(&zbuf);
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return 0;
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}
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/*
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* Initial version will perform a single gzip encapsulation,
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* filling in the header,
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* and appending the crc and uncompressed length.
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*
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* Later version will support multiple buffers with
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* a flag indication final buffer. The crc is maintained
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* over all buffers and appended to the output along with
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* the uncompressed length after the final data buffer
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* has been compressed and output.
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*
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* Ditto for uncompress - CRC is extracted from the final packed
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* and compared against CRC of uncompressed data.
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*
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*/
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/* constant header for the gzip */
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static const char gzip_header[10] = {
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0x1f, 0x8b, /* ID1 ID2 */
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Z_DEFLATED, /* CM */
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0, /* FLG */
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0, 0, 0, 0, /* MTIME */
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0, /* XFL */
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0x03 /* OS (Unix) */
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};
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/* Followed by compressed payload */
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/* Followed by uint32_t CRC32 and uint32_t ISIZE */
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#define GZIP_TAIL_SIZE 8
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u_int32_t
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gzip_global(u_int8_t *data, u_int32_t size,
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int decomp, u_int8_t **out)
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{
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/* decomp indicates whether we compress (0) or decompress (1) */
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z_stream zbuf;
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u_int8_t *output;
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u_int32_t count, result;
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int error, i = 0, j;
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struct deflate_buf *buf, *tmp;
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size_t nbufs, old_nbufs;
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u_int32_t crc;
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u_int32_t isize;
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DPRINTF(("gzip_global: decomp %d, size %d\n", decomp, size));
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nbufs = ZBUF;
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buf = malloc(nbufs*sizeof(struct deflate_buf), M_CRYPTO_DATA, M_NOWAIT);
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if (buf == NULL) {
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DPRINTF(("gzip_global.%d: failed to malloc %d\n",
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__LINE__, nbufs*sizeof(struct deflate_buf)));
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return 0;
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}
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memset(&zbuf, 0, sizeof(z_stream));
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for (j = 0; j < nbufs; j++)
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buf[j].flag = 0;
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zbuf.zalloc = ocf_zalloc;
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zbuf.zfree = ocf_zfree;
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zbuf.opaque = Z_NULL;
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crc = crc32(0, NULL, 0); /* get initial crc value */
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zbuf.avail_in = size; /* Total length of data to be processed */
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zbuf.next_in = data; /* data that is going to be processed */
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if (!decomp) {
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/* compress */
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DPRINTF(("gzip_global: compress[%d] malloc %d + %d + %d = %d\n",
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i, size, sizeof(gzip_header), GZIP_TAIL_SIZE,
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size + sizeof(gzip_header) + GZIP_TAIL_SIZE));
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buf[i].out = malloc(size, M_CRYPTO_DATA, M_NOWAIT);
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if (buf[i].out == NULL)
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goto bad2;
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buf[i].size = size;
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buf[i].flag = 1;
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zbuf.next_out = buf[i].out;
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zbuf.avail_out = buf[i].size;
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i++;
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crc = crc32(crc, data, size);
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DPRINTF(("gzip_compress: size %d, crc 0x%x\n", size, crc));
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} else {
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/* decompress */
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/* check the gzip header */
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if (zbuf.avail_in <= 0) {
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/* Not enough data for the header & tail */
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DPRINTF(("gzip_global: not enough data (%d)\n",
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size));
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goto bad2;
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}
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/* XXX this is pretty basic,
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* needs to be expanded to ignore MTIME, OS,
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* but still ensure flags are 0.
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* Q. Do we need to support the flags and
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* optional header fields? Likely.
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* XXX add flag and field support too.
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*/
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if (memcmp(data, gzip_header, sizeof(gzip_header)) != 0) {
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DPRINTF(("gzip_global: unsupported gzip header (%02x%02x)\n",
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data[0], data[1]));
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goto bad2;
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} else {
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DPRINTF(("gzip_global.%d: gzip header ok\n",__LINE__));
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}
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isize = *((uint32_t *)&data[size-sizeof(uint32_t)]);
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DPRINTF(("gzip_global: isize = %d (%02x %02x %02x %02x)\n",
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isize,
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data[size-4],
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data[size-3],
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data[size-2],
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data[size-1]));
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buf[i].size = isize;
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buf[i].out = malloc(buf[i].size, M_CRYPTO_DATA, M_NOWAIT);
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if (buf[i].out == NULL)
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goto bad2;
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buf[i].flag = 1;
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zbuf.next_out = buf[i].out;
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zbuf.avail_out = buf[i].size;
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i++;
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/* skip over the gzip header */
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zbuf.next_in = data + sizeof(gzip_header);
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/* actual payload size stripped of gzip header and tail */
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zbuf.avail_in = size - sizeof(gzip_header) - GZIP_TAIL_SIZE;
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DPRINTF(("zbuf avail_in %d, avail_out %d\n",
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zbuf.avail_in, zbuf.avail_out));
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}
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error = decomp ? inflateInit2(&zbuf, window_inflate) :
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deflateInit2(&zbuf, Z_DEFAULT_COMPRESSION, Z_METHOD,
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window_deflate, Z_MEMLEVEL, Z_DEFAULT_STRATEGY);
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if (error != Z_OK) {
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printf("deflateInit2() failed\n");
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goto bad;
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}
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for (;;) {
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DPRINTF(("pre: %s in:%d out:%d\n", decomp ? "deflate()" : "inflate()",
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zbuf.avail_in, zbuf.avail_out));
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error = decomp ? inflate(&zbuf, Z_PARTIAL_FLUSH) :
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deflate(&zbuf, Z_PARTIAL_FLUSH);
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DPRINTF(("post: %s in:%d out:%d\n", decomp ? "deflate()" : "inflate()",
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zbuf.avail_in, zbuf.avail_out));
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if (error != Z_OK && error != Z_STREAM_END) {
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printf("deflate() or inflate() failed, error=%d\n", error);
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goto bad;
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} else if (zbuf.avail_in == 0 && zbuf.avail_out != 0) {
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DPRINTF(("gzip_global: avail_in == 0, ending\n"));
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goto end;
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} else if (zbuf.avail_in == 0 && zbuf.avail_out == 0) {
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DPRINTF(("gzip_global: avail_in == 0, avail_out == 0, ending\n"));
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goto end;
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} else if (zbuf.avail_out == 0) {
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if (i == (nbufs-1)) {
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old_nbufs = i;
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nbufs += ZBUF;
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tmp = realloc(buf,nbufs*sizeof(struct deflate_buf),
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M_CRYPTO_DATA, M_NOWAIT);
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if (tmp == NULL)
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goto bad;
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buf = tmp;
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for (j = old_nbufs; j < nbufs; j++)
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buf[j].flag = 0;
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}
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/* we need more output space, allocate size */
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buf[i].out = malloc(size, M_CRYPTO_DATA, M_NOWAIT);
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if (buf[i].out == NULL)
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goto bad;
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zbuf.next_out = buf[i].out;
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buf[i].size = size;
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buf[i].flag = 1;
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zbuf.avail_out = buf[i].size;
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i++;
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} else
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goto bad;
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}
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end:
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if (decomp) {
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count = result = zbuf.total_out;
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} else {
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/* need room for header, CRC, and ISIZE */
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result = zbuf.total_out + sizeof(gzip_header) + GZIP_TAIL_SIZE;
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count = zbuf.total_out;
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}
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DPRINTF(("gzip_global: in %d -> out %d\n", size, result));
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*out = malloc(result, M_CRYPTO_DATA, M_NOWAIT);
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if (*out == NULL)
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goto bad;
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output = *out;
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if (decomp)
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inflateEnd(&zbuf);
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else {
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deflateEnd(&zbuf);
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/* fill in gzip header */
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memcpy(output, gzip_header, sizeof(gzip_header));
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output += sizeof(gzip_header);
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}
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for (j = 0; buf[j].flag != 0; j++) {
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if (decomp) {
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/* update crc for decompressed data */
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crc = crc32(crc, buf[j].out, buf[j].size);
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}
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if (count > buf[j].size) {
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memcpy(output, buf[j].out, buf[j].size);
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output += buf[j].size;
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free(buf[j].out, M_CRYPTO_DATA);
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count -= buf[j].size;
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} else {
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/* it should be the last buffer */
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memcpy(output, buf[j].out, count);
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output += count;
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free(buf[j].out, M_CRYPTO_DATA);
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count = 0;
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}
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}
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free(buf, M_CRYPTO_DATA);
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if (!decomp) {
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/* fill in CRC and ISIZE */
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((uint32_t *)output)[0] = crc;
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((uint32_t *)output)[1] = size;
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DPRINTF(("gzip_global: size = 0x%x (%02x %02x %02x %02x)\n",
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size,
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output[7],
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output[3],
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output[5],
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output[4]));
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}
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return result;
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bad:
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if (decomp)
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inflateEnd(&zbuf);
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else
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deflateEnd(&zbuf);
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bad2:
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*out = NULL;
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for (j = 0; buf[j].flag != 0; j++)
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free(buf[j].out, M_CRYPTO_DATA);
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free(buf, M_CRYPTO_DATA);
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return 0;
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}
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