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>
21#include <linux/string.h>
22
23#include <net/checksum.h>
24#include <asm/byteorder.h>
25#include <asm/uaccess.h>
26
27/*
28 * Copy while checksumming, otherwise like csum_partial
29 */
30__wsum
31csum_partial_copy_nocheck (const void *src, void *dst, int len, __wsum sum)
32{
33	sum = csum_partial(src, len, sum);
34	memcpy(dst, src, len);
35
36	return sum;
37}
38EXPORT_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 */
44__wsum
45csum_partial_copy_from_user (const void __user *src, void *dst,
46			     int len, __wsum sum, int *err_ptr)
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}
58EXPORT_SYMBOL(csum_partial_copy_from_user);
59EXPORT_SYMBOL(csum_partial);
60