projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 09831ca7 | 2 | /* |
| 09831ca7 AJ |
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 | |
| 13 | csum_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 | } | |
| 27 | EXPORT_SYMBOL(csum_partial_copy_from_user); | |
| 28 | ||
| 29 | /* These are from csum_64plus.S */ | |
| 30 | EXPORT_SYMBOL(csum_partial); | |
| 31 | EXPORT_SYMBOL(csum_partial_copy); | |
| 32 | EXPORT_SYMBOL(ip_compute_csum); | |
| 33 | EXPORT_SYMBOL(ip_fast_csum); |