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