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 #include <linux/string.h>
22
23 #include <net/checksum.h>
24 #include <asm/byteorder.h>
25 #include <asm/uaccess.h>
26
27 /*
28 * Copy while checksumming, otherwise like csum_partial
29 */
30 __wsum
csum_partial_copy_nocheck(const void * src,void * dst,int len,__wsum sum)31 csum_partial_copy_nocheck (const void *src, void *dst, int len, __wsum sum)
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 */
44 __wsum
csum_partial_copy_from_user(const void __user * src,void * dst,int len,__wsum sum,int * err_ptr)45 csum_partial_copy_from_user (const void __user *src, void *dst,
46 int len, __wsum sum, int *err_ptr)
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);
59 EXPORT_SYMBOL(csum_partial);
60