1/*
2 *		This program is free software; you can redistribute it and/or
3 *		modify it under the terms of the GNU General Public License
4 *		as published by the Free Software Foundation; either version
5 *		2 of the License, or (at your option) any later version.
6 */
7#include <linux/module.h>
8#include <net/checksum.h>
9
10#include <asm/byteorder.h>
11
12/*
13 * copy from fs while checksumming, otherwise like csum_partial
14 */
15__wsum
16csum_partial_copy_from_user(const void __user *src, void *dst, int len,
17			    __wsum sum, int *csum_err)
18{
19	int missing;
20
21	missing = __copy_from_user(dst, src, len);
22	if (missing) {
23		memset(dst + len - missing, 0, missing);
24		*csum_err = -EFAULT;
25	} else
26		*csum_err = 0;
27
28	return csum_partial(dst, len, sum);
29}
30EXPORT_SYMBOL(csum_partial_copy_from_user);
31
32/* These are from csum_64plus.S */
33EXPORT_SYMBOL(csum_partial);
34EXPORT_SYMBOL(csum_partial_copy);
35EXPORT_SYMBOL(ip_compute_csum);
36EXPORT_SYMBOL(ip_fast_csum);
37