mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-28 07:04:00 +08:00
4301785c7c
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
62 lines
1.3 KiB
C
62 lines
1.3 KiB
C
/*
|
|
* 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, unsigned short 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
|