60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
/*
|
|
* INET An implementation of the TCP/IP protocol suite for the LINUX
|
|
* operating system. INET is implemented using the BSD Socket
|
|
* interface as the means of communication with the user level.
|
|
*
|
|
* M32R specific IP/TCP/UDP checksumming routines
|
|
* (Some code taken from MIPS architecture)
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 1994, 1995 Waldorf Electronics GmbH
|
|
* Copyright (C) 1998, 1999 Ralf Baechle
|
|
* Copyright (C) 2001-2005 Hiroyuki Kondo, Hirokazu Takata
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/string.h>
|
|
|
|
#include <net/checksum.h>
|
|
#include <asm/byteorder.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
/*
|
|
* Copy while checksumming, otherwise like csum_partial
|
|
*/
|
|
__wsum
|
|
csum_partial_copy_nocheck (const void *src, void *dst, int len, __wsum sum)
|
|
{
|
|
sum = csum_partial(src, len, sum);
|
|
memcpy(dst, src, len);
|
|
|
|
return sum;
|
|
}
|
|
EXPORT_SYMBOL(csum_partial_copy_nocheck);
|
|
|
|
/*
|
|
* Copy from userspace and compute checksum. If we catch an exception
|
|
* then zero the rest of the buffer.
|
|
*/
|
|
__wsum
|
|
csum_partial_copy_from_user (const void __user *src, void *dst,
|
|
int len, __wsum sum, int *err_ptr)
|
|
{
|
|
int missing;
|
|
|
|
missing = copy_from_user(dst, src, len);
|
|
if (missing) {
|
|
memset(dst + len - missing, 0, missing);
|
|
*err_ptr = -EFAULT;
|
|
}
|
|
|
|
return csum_partial(dst, len-missing, sum);
|
|
}
|
|
EXPORT_SYMBOL(csum_partial_copy_from_user);
|
|
EXPORT_SYMBOL(csum_partial);
|