linux/arch/x86/um/asm/checksum_32.h
Al Viro 4301785c7c um/x86: merge 32 and 64bit variants of checksum.h
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
2012-10-09 22:28:16 +02:00

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