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1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 1994, 1995 Waldorf Electronics GmbH | |
7 | * Copyright (C) 1998, 1999 Ralf Baechle | |
8 | */ | |
9 | #include <linux/kernel.h> | |
ae32ffd6 | 10 | #include <linux/module.h> |
1da177e4 LT |
11 | #include <linux/types.h> |
12 | #include <asm/byteorder.h> | |
13 | #include <asm/string.h> | |
14 | #include <asm/uaccess.h> | |
15 | #include <net/checksum.h> | |
16 | ||
17 | /* | |
18 | * copy while checksumming, otherwise like csum_partial | |
19 | */ | |
8e3d8433 AV |
20 | __wsum csum_partial_copy_nocheck(const void *src, |
21 | void *dst, int len, __wsum sum) | |
1da177e4 LT |
22 | { |
23 | /* | |
24 | * It's 2:30 am and I don't feel like doing it real ... | |
25 | * This is lots slower than the real thing (tm) | |
26 | */ | |
27 | sum = csum_partial(src, len, sum); | |
28 | memcpy(dst, src, len); | |
29 | ||
30 | return sum; | |
31 | } | |
32 | ||
ae32ffd6 RB |
33 | EXPORT_SYMBOL(csum_partial_copy_nocheck); |
34 | ||
1da177e4 LT |
35 | /* |
36 | * Copy from userspace and compute checksum. If we catch an exception | |
37 | * then zero the rest of the buffer. | |
38 | */ | |
8e3d8433 AV |
39 | __wsum csum_partial_copy_from_user (const void __user *src, |
40 | void *dst, int len, __wsum sum, int *err_ptr) | |
1da177e4 LT |
41 | { |
42 | int missing; | |
43 | ||
44 | might_sleep(); | |
45 | missing = copy_from_user(dst, src, len); | |
46 | if (missing) { | |
47 | memset(dst + len - missing, 0, missing); | |
48 | *err_ptr = -EFAULT; | |
49 | } | |
50 | ||
51 | return csum_partial(dst, len, sum); | |
52 | } |