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
60
61
| /*
| * Licensed under the GPL
| */
|
| #ifndef __UM_SYSDEP_CHECKSUM_H
| #define __UM_SYSDEP_CHECKSUM_H
|
| static inline __sum16 ip_compute_csum(const void *buff, int len)
| {
| return csum_fold (csum_partial(buff, len, 0));
| }
|
| #define _HAVE_ARCH_IPV6_CSUM
| static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
| const struct in6_addr *daddr,
| __u32 len, __u8 proto,
| __wsum sum)
| {
| __asm__(
| "addl 0(%1), %0 ;\n"
| "adcl 4(%1), %0 ;\n"
| "adcl 8(%1), %0 ;\n"
| "adcl 12(%1), %0 ;\n"
| "adcl 0(%2), %0 ;\n"
| "adcl 4(%2), %0 ;\n"
| "adcl 8(%2), %0 ;\n"
| "adcl 12(%2), %0 ;\n"
| "adcl %3, %0 ;\n"
| "adcl %4, %0 ;\n"
| "adcl $0, %0 ;\n"
| : "=&r" (sum)
| : "r" (saddr), "r" (daddr),
| "r"(htonl(len)), "r"(htonl(proto)), "0"(sum));
|
| return csum_fold(sum);
| }
|
| /*
| * Copy and checksum to user
| */
| #define HAVE_CSUM_COPY_USER
| static __inline__ __wsum csum_and_copy_to_user(const void *src,
| void __user *dst,
| int len, __wsum sum, int *err_ptr)
| {
| if (access_ok(VERIFY_WRITE, dst, len)) {
| if (copy_to_user(dst, src, len)) {
| *err_ptr = -EFAULT;
| return (__force __wsum)-1;
| }
|
| return csum_partial(src, len, sum);
| }
|
| if (len)
| *err_ptr = -EFAULT;
|
| return (__force __wsum)-1; /* invalid checksum */
| }
|
| #endif
|
|
