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 * MIPS64 specific IP/TCP/UDP checksumming routines
7 *
8 * Copyright (C) 1998, 1999 Ralf Baechle
9 */
10 #include <net/checksum.h>
11 #include <linux/types.h>
12 #include <asm/byteorder.h>
13 #include <asm/string.h>
14 #include <asm/uaccess.h>
15
16 /*
17 * copy while checksumming, otherwise like csum_partial
18 */
csum_partial_copy(const char * src,char * dst,int len,unsigned int sum)19 unsigned int csum_partial_copy(const char *src, char *dst,
20 int len, unsigned int sum)
21 {
22 /*
23 * It's 2:30 am and I don't feel like doing it real ...
24 * This is lots slower than the real thing (tm)
25 */
26 sum = csum_partial(src, len, sum);
27 memcpy(dst, src, len);
28
29 return sum;
30 }
31
32 /*
33 * Copy from userspace and compute checksum. If we catch an exception
34 * then zero the rest of the buffer.
35 */
csum_partial_copy_from_user(const char * src,char * dst,int len,unsigned int sum,int * err_ptr)36 unsigned int csum_partial_copy_from_user (const char *src, char *dst,
37 int len, unsigned int sum,
38 int *err_ptr)
39 {
40 int missing;
41
42 missing = copy_from_user(dst, src, len);
43 if (missing) {
44 memset(dst + len - missing, 0, missing);
45 *err_ptr = -EFAULT;
46 }
47
48 return csum_partial(dst, len, sum);
49 }
50