96 lines
2.6 KiB
C
96 lines
2.6 KiB
C
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#ifndef __ASM_SH64_CHECKSUM_H
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#define __ASM_SH64_CHECKSUM_H
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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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* include/asm-sh64/checksum.h
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*
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* Copyright (C) 2000, 2001 Paolo Alberelli
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*
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*/
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#include <asm/registers.h>
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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 unsigned int csum_partial(const unsigned char *buff, int len,
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unsigned int 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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* verify_area().
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*/
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unsigned int csum_partial_copy_nocheck(const char *src, char *dst, int len,
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unsigned int sum);
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unsigned int csum_partial_copy_from_user(const char *src, char *dst,
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int len, int sum, int *err_ptr);
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/*
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* These are the old (and unsafe) way of doing checksums, a warning message will be
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* printed if they are used and an exeption occurs.
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*
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* these functions should go away after some time.
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*/
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#define csum_partial_copy_fromuser csum_partial_copy
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unsigned int csum_partial_copy(const char *src, char *dst, int len,
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unsigned int sum);
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static inline unsigned short csum_fold(unsigned int sum)
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{
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sum = (sum & 0xffff) + (sum >> 16);
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sum = (sum & 0xffff) + (sum >> 16);
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return ~(sum);
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}
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unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl);
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unsigned long csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
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unsigned short len, unsigned short proto,
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unsigned int 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 unsigned short int csum_tcpudp_magic(unsigned long saddr,
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unsigned long daddr,
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unsigned short len,
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unsigned short proto,
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unsigned int 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 unsigned short ip_compute_csum(unsigned char * 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_SH64_CHECKSUM_H */
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