5113f6f70
 김현기
kernel add
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
/*
* INET An implementation of the TCP/IP protocol suite for the LINUX
* operating system. INET is implemented using the BSD Socket
* interface as the means of communication with the user level.
*
* M32R specific IP/TCP/UDP checksumming routines
* (Some code taken from MIPS architecture)
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1994, 1995 Waldorf Electronics GmbH
* Copyright (C) 1998, 1999 Ralf Baechle
* Copyright (C) 2001-2005 Hiroyuki Kondo, Hirokazu Takata
*
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <net/checksum.h>
#include <asm/byteorder.h>
#include <asm/uaccess.h>
/*
* Copy while checksumming, otherwise like csum_partial
*/
__wsum
csum_partial_copy_nocheck (const void *src, void *dst, int len, __wsum sum)
{
sum = csum_partial(src, len, sum);
memcpy(dst, src, len);
return sum;
}
EXPORT_SYMBOL(csum_partial_copy_nocheck);
/*
* Copy from userspace and compute checksum. If we catch an exception
* then zero the rest of the buffer.
*/
__wsum
csum_partial_copy_from_user (const void __user *src, void *dst,
int len, __wsum sum, int *err_ptr)
{
int missing;
missing = copy_from_user(dst, src, len);
if (missing) {
memset(dst + len - missing, 0, missing);
*err_ptr = -EFAULT;
}
return csum_partial(dst, len-missing, sum);
}
EXPORT_SYMBOL(csum_partial_copy_from_user);
EXPORT_SYMBOL(csum_partial);
|