[mirror_ubuntu-zesty-kernel.git] / arch / m32r / lib / csum_partial_copy.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);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* INET An implementation of the TCP/IP protocol suite for the LINUX
	3	* operating system. INET is implemented using the BSD Socket
	4	* interface as the means of communication with the user level.
	5	*
	6	* M32R specific IP/TCP/UDP checksumming routines
	7	* (Some code taken from MIPS architecture)
	8	*
	9	* This file is subject to the terms and conditions of the GNU General Public
	10	* License. See the file "COPYING" in the main directory of this archive
	11	* for more details.
	12	*
	13	* Copyright (C) 1994, 1995 Waldorf Electronics GmbH
	14	* Copyright (C) 1998, 1999 Ralf Baechle
	15	* Copyright (C) 2001-2005 Hiroyuki Kondo, Hirokazu Takata
	16	*
	17	*/
	18
	19	#include <linux/module.h>
	20	#include <linux/types.h>
4e57b681	21	#include <linux/string.h>
1da177e4 LT	22
	23	#include <net/checksum.h>
	24	#include <asm/byteorder.h>
1da177e4 LT	25	#include <asm/uaccess.h>
	26
	27	/*
	28	* Copy while checksumming, otherwise like csum_partial
	29	*/
85d20dee AV	30	__wsum
85d20dee AV	31	csum_partial_copy_nocheck (const void src, void dst, int len, __wsum sum)
1da177e4 LT	32	{
	33	sum = csum_partial(src, len, sum);
	34	memcpy(dst, src, len);
	35
	36	return sum;
	37	}
	38	EXPORT_SYMBOL(csum_partial_copy_nocheck);
	39
	40	/*
	41	* Copy from userspace and compute checksum. If we catch an exception
	42	* then zero the rest of the buffer.
	43	*/
85d20dee AV	44	__wsum
	45	csum_partial_copy_from_user (const void __user src, void dst,
	46	int len, __wsum sum, int *err_ptr)
1da177e4 LT	47	{
	48	int missing;
	49
	50	missing = copy_from_user(dst, src, len);
	51	if (missing) {
	52	memset(dst + len - missing, 0, missing);
	53	*err_ptr = -EFAULT;
	54	}
	55
	56	return csum_partial(dst, len-missing, sum);
	57	}
	58	EXPORT_SYMBOL(csum_partial_copy_from_user);
eaaece26	59	EXPORT_SYMBOL(csum_partial);