1/*
 2 * Licensed under the GPL
 3 */
 4
 5#ifndef __UM_SYSDEP_CHECKSUM_H
 6#define __UM_SYSDEP_CHECKSUM_H
 7
 8static inline __sum16 ip_compute_csum(const void *buff, int len)
 9{
10    return csum_fold (csum_partial(buff, len, 0));
11}
12
13#define _HAVE_ARCH_IPV6_CSUM
14static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
15					  const struct in6_addr *daddr,
16					  __u32 len, __u8 proto,
17					  __wsum sum)
18{
19	__asm__(
20		"addl 0(%1), %0		;\n"
21		"adcl 4(%1), %0		;\n"
22		"adcl 8(%1), %0		;\n"
23		"adcl 12(%1), %0	;\n"
24		"adcl 0(%2), %0		;\n"
25		"adcl 4(%2), %0		;\n"
26		"adcl 8(%2), %0		;\n"
27		"adcl 12(%2), %0	;\n"
28		"adcl %3, %0		;\n"
29		"adcl %4, %0		;\n"
30		"adcl $0, %0		;\n"
31		: "=&r" (sum)
32		: "r" (saddr), "r" (daddr),
33		  "r"(htonl(len)), "r"(htonl(proto)), "0"(sum));
34
35	return csum_fold(sum);
36}
37
38/*
39 *	Copy and checksum to user
40 */
41#define HAVE_CSUM_COPY_USER
42static __inline__ __wsum csum_and_copy_to_user(const void *src,
43						     void __user *dst,
44						     int len, __wsum sum, int *err_ptr)
45{
46	if (access_ok(VERIFY_WRITE, dst, len)) {
47		if (copy_to_user(dst, src, len)) {
48			*err_ptr = -EFAULT;
49			return (__force __wsum)-1;
50		}
51
52		return csum_partial(src, len, sum);
53	}
54
55	if (len)
56		*err_ptr = -EFAULT;
57
58	return (__force __wsum)-1; /* invalid checksum */
59}
60
61#endif

 1/*
 2 * Licensed under the GPL
 3 */
 4
 5#ifndef __UM_SYSDEP_CHECKSUM_H
 6#define __UM_SYSDEP_CHECKSUM_H
 7
 8static inline __sum16 ip_compute_csum(const void *buff, int len)
 9{
10    return csum_fold (csum_partial(buff, len, 0));
11}
12
13#define _HAVE_ARCH_IPV6_CSUM
14static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
15					  const struct in6_addr *daddr,
16					  __u32 len, unsigned short proto,
17					  __wsum sum)
18{
19	__asm__(
20		"addl 0(%1), %0		;\n"
21		"adcl 4(%1), %0		;\n"
22		"adcl 8(%1), %0		;\n"
23		"adcl 12(%1), %0	;\n"
24		"adcl 0(%2), %0		;\n"
25		"adcl 4(%2), %0		;\n"
26		"adcl 8(%2), %0		;\n"
27		"adcl 12(%2), %0	;\n"
28		"adcl %3, %0		;\n"
29		"adcl %4, %0		;\n"
30		"adcl $0, %0		;\n"
31		: "=&r" (sum)
32		: "r" (saddr), "r" (daddr),
33		  "r"(htonl(len)), "r"(htonl(proto)), "0"(sum));
34
35	return csum_fold(sum);
36}
37
38/*
39 *	Copy and checksum to user
40 */
41#define HAVE_CSUM_COPY_USER
42static __inline__ __wsum csum_and_copy_to_user(const void *src,
43						     void __user *dst,
44						     int len, __wsum sum, int *err_ptr)
45{
46	if (access_ok(VERIFY_WRITE, dst, len)) {
47		if (copy_to_user(dst, src, len)) {
48			*err_ptr = -EFAULT;
49			return (__force __wsum)-1;
50		}
51
52		return csum_partial(src, len, sum);
53	}
54
55	if (len)
56		*err_ptr = -EFAULT;
57
58	return (__force __wsum)-1; /* invalid checksum */
59}
60
61#endif