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#ifndef _ASM_X86_CHECKSUM_64_H
#define _ASM_X86_CHECKSUM_64_H
/*
* Checksums for x86-64
* Copyright 2002 by Andi Kleen, SuSE Labs
* with some code from asm-x86/checksum.h
*/
#include <asm/uaccess.h>
#include <asm/byteorder.h>
/*
* Fold a partial checksum without adding pseudo headers
*/
static inline unsigned short csum_fold(unsigned int sum)
{
sum = (sum & 0xffff) + (sum >> 16);
sum = (sum & 0xffff) + (sum >> 16);
return ~sum;
}
/*
* This is a version of ip_compute_csum() optimized for IP headers,
* which always checksum on 4 octet boundaries.
*/
extern unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl);
/*
* computes the checksum of the TCP/UDP pseudo-header
* returns a 16-bit checksum, already complemented
*/
extern unsigned short int csum_tcpudp_magic(unsigned long saddr,
unsigned long daddr,
unsigned short len,
unsigned short proto,
unsigned int sum);
unsigned int csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
unsigned short len, unsigned short proto,
unsigned int sum);
/**
* csum_partial - Compute an internet checksum.
* @buff: buffer to be checksummed
* @len: length of buffer.
* @sum: initial sum to be added in (32bit unfolded)
*
* Returns the 32bit unfolded internet checksum of the buffer.
* Before filling it in it needs to be csum_fold()'ed.
* buff should be aligned to a 64bit boundary if possible.
*/
extern unsigned int csum_partial(const void *buff, int len, unsigned int sum);
#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER 1
#define HAVE_CSUM_COPY_USER 1
static inline unsigned int
csum_partial_copy(const char *src, char *dst, int len,unsigned int sum)
{
memcpy(dst,src,len);
return csum_partial(dst, len, sum);
}
/* Do not call this directly. Use the wrappers below */
static inline unsigned int
csum_partial_copy_generic(const void *src, void *dst,
int len, unsigned int sum,
int *src_err_ptr, int *dst_err_ptr)
{
return csum_partial_copy(src, dst, len, sum);
}
static __inline__
unsigned int csum_partial_copy_to_user ( const void *src, void *dst,
int len, unsigned int sum, int *err_ptr)
{
return csum_partial_copy_generic ( src, dst, len, sum, NULL, err_ptr);
}
static __inline__
unsigned int csum_partial_copy_from_user ( const void *src, void *dst,
int len, unsigned int sum, int *err_ptr)
{
return csum_partial_copy_generic ( src, dst, len, sum, err_ptr, NULL);
}
extern unsigned int csum_partial_copy_nocheck(const void *src, void *dst,
int len, unsigned int sum);
#define csum_partial_copy_nocheck(src, dst, len, sum) \
csum_partial_copy((src), (dst), (len), (sum))
/* Old names. To be removed. */
#define csum_and_copy_to_user csum_partial_copy_to_user
#define csum_and_copy_from_user csum_partial_copy_from_user
/**
* ip_compute_csum - Compute an 16bit IP checksum.
* @buff: buffer address.
* @len: length of buffer.
*
* Returns the 16bit folded/inverted checksum of the passed buffer.
* Ready to fill in.
*/
extern unsigned short ip_compute_csum(const void *buff, int len);
#endif /* _ASM_X86_CHECKSUM_64_H */
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