tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 */
4#include <linux/module.h>
5#include <net/checksum.h>
6
7#include <asm/byteorder.h>
8
9/*
10 * copy from fs while checksumming, otherwise like csum_partial
11 */
12__wsum
13csum_partial_copy_from_user(const void __user *src, void *dst, int len,
14 __wsum sum, int *csum_err)
15{
16 int missing;
17
18 missing = __copy_from_user(dst, src, len);
19 if (missing) {
20 memset(dst + len - missing, 0, missing);
21 *csum_err = -EFAULT;
22 } else
23 *csum_err = 0;
24
25 return csum_partial(dst, len, sum);
26}
27EXPORT_SYMBOL(csum_partial_copy_from_user);
28
29/* These are from csum_64plus.S */
30EXPORT_SYMBOL(csum_partial);
31EXPORT_SYMBOL(csum_partial_copy);
32EXPORT_SYMBOL(ip_compute_csum);
33EXPORT_SYMBOL(ip_fast_csum);