| Aurelien Jacquiot | 09831ca | 2011-10-04 11:15:51 -0400 | [diff] [blame] | 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 |
| 16 | csum_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 | } |
| 30 | EXPORT_SYMBOL(csum_partial_copy_from_user); |
| 31 | |
| 32 | /* These are from csum_64plus.S */ |
| 33 | EXPORT_SYMBOL(csum_partial); |
| 34 | EXPORT_SYMBOL(csum_partial_copy); |
| 35 | EXPORT_SYMBOL(ip_compute_csum); |
| 36 | EXPORT_SYMBOL(ip_fast_csum); |