mirror of
https://github.com/torvalds/linux.git
synced 2024-11-28 07:01:32 +00:00
79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
#ifndef __ASM_SH_CHECKSUM_64_H
|
|
#define __ASM_SH_CHECKSUM_64_H
|
|
|
|
/*
|
|
* include/asm-sh/checksum_64.h
|
|
*
|
|
* Copyright (C) 2000, 2001 Paolo Alberelli
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
|
|
/*
|
|
* computes the checksum of a memory block at buff, length len,
|
|
* and adds in "sum" (32-bit)
|
|
*
|
|
* returns a 32-bit number suitable for feeding into itself
|
|
* or csum_tcpudp_magic
|
|
*
|
|
* this function must be called with even lengths, except
|
|
* for the last fragment, which may be odd
|
|
*
|
|
* it's best to have buff aligned on a 32-bit boundary
|
|
*/
|
|
asmlinkage __wsum csum_partial(const void *buff, int len, __wsum sum);
|
|
|
|
/*
|
|
* Note: when you get a NULL pointer exception here this means someone
|
|
* passed in an incorrect kernel address to one of these functions.
|
|
*
|
|
* If you use these functions directly please don't forget the
|
|
* access_ok().
|
|
*/
|
|
|
|
|
|
__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len,
|
|
__wsum sum);
|
|
|
|
__wsum csum_partial_copy_from_user(const void __user *src, void *dst,
|
|
int len, __wsum sum, int *err_ptr);
|
|
|
|
static inline __sum16 csum_fold(__wsum csum)
|
|
{
|
|
u32 sum = (__force u32)csum;
|
|
sum = (sum & 0xffff) + (sum >> 16);
|
|
sum = (sum & 0xffff) + (sum >> 16);
|
|
return (__force __sum16)~sum;
|
|
}
|
|
|
|
__sum16 ip_fast_csum(const void *iph, unsigned int ihl);
|
|
|
|
__wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
|
|
unsigned short len, unsigned short proto,
|
|
__wsum sum);
|
|
|
|
/*
|
|
* computes the checksum of the TCP/UDP pseudo-header
|
|
* returns a 16-bit checksum, already complemented
|
|
*/
|
|
static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
|
|
unsigned short len,
|
|
unsigned short proto,
|
|
__wsum sum)
|
|
{
|
|
return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
|
|
}
|
|
|
|
/*
|
|
* this routine is used for miscellaneous IP-like checksums, mainly
|
|
* in icmp.c
|
|
*/
|
|
static inline __sum16 ip_compute_csum(const void *buff, int len)
|
|
{
|
|
return csum_fold(csum_partial(buff, len, 0));
|
|
}
|
|
|
|
#endif /* __ASM_SH_CHECKSUM_64_H */
|