projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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> | |
| 4e57b681 | 21 | #include <linux/string.h> |
| 1da177e4 LT |
22 | |
| 23 | #include <net/checksum.h> | |
| 24 | #include <asm/byteorder.h> | |
| 1da177e4 LT |
25 | #include <asm/uaccess.h> |
| 26 | ||
| 27 | /* | |
| 28 | * Copy while checksumming, otherwise like csum_partial | |
| 29 | */ | |
| 85d20dee AV |
30 | __wsum |
| 31 | csum_partial_copy_nocheck (const void *src, void *dst, int len, __wsum sum) | |
| 1da177e4 LT |
32 | { |
| 33 | sum = csum_partial(src, len, sum); | |
| 34 | memcpy(dst, src, len); | |
| 35 | ||
| 36 | return sum; | |
| 37 | } | |
| 38 | EXPORT_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 | */ | |
| 85d20dee AV |
44 | __wsum |
| 45 | csum_partial_copy_from_user (const void __user *src, void *dst, | |
| 46 | int len, __wsum sum, int *err_ptr) | |
| 1da177e4 LT |
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 | } | |
| 58 | EXPORT_SYMBOL(csum_partial_copy_from_user); | |
| eaaece26 | 59 | EXPORT_SYMBOL(csum_partial); |