Commit | Line | Data |
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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> | |
21 | ||
22 | #include <net/checksum.h> | |
23 | #include <asm/byteorder.h> | |
24 | #include <asm/string.h> | |
25 | #include <asm/uaccess.h> | |
26 | ||
27 | /* | |
28 | * Copy while checksumming, otherwise like csum_partial | |
29 | */ | |
30 | unsigned int | |
31 | csum_partial_copy_nocheck (const unsigned char *src, unsigned char *dst, | |
32 | int len, unsigned int sum) | |
33 | { | |
34 | sum = csum_partial(src, len, sum); | |
35 | memcpy(dst, src, len); | |
36 | ||
37 | return sum; | |
38 | } | |
39 | EXPORT_SYMBOL(csum_partial_copy_nocheck); | |
40 | ||
41 | /* | |
42 | * Copy from userspace and compute checksum. If we catch an exception | |
43 | * then zero the rest of the buffer. | |
44 | */ | |
45 | unsigned int | |
46 | csum_partial_copy_from_user (const unsigned char __user *src, | |
47 | unsigned char *dst, | |
48 | int len, unsigned int sum, int *err_ptr) | |
49 | { | |
50 | int missing; | |
51 | ||
52 | missing = copy_from_user(dst, src, len); | |
53 | if (missing) { | |
54 | memset(dst + len - missing, 0, missing); | |
55 | *err_ptr = -EFAULT; | |
56 | } | |
57 | ||
58 | return csum_partial(dst, len-missing, sum); | |
59 | } | |
60 | EXPORT_SYMBOL(csum_partial_copy_from_user); | |
eaaece26 | 61 | EXPORT_SYMBOL(csum_partial); |