#ifndef _OR32_CHECKSUM_H
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#ifndef _OR32_CHECKSUM_H
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#define _OR32_CHECKSUM_H
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#define _OR32_CHECKSUM_H
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#include <linux/config.h>
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#include <linux/config.h>
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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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* 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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* and adds in "sum" (32-bit)
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*
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*
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* returns a 32-bit number suitable for feeding into itself
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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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* or csum_tcpudp_magic
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*
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*
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* this function must be called with even lengths, except
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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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* for the last fragment, which may be odd
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*
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*
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* it's best to have buff aligned on a 32-bit boundary
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* it's best to have buff aligned on a 32-bit boundary
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*/
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*/
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unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
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unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
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/*
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/*
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* the same as csum_partial_copy, but copies from src while it
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* the same as csum_partial_copy, but copies from src while it
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* checksums
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* checksums
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*
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*
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* here even more important to align src and dst on a 32-bit (or even
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* here even more important to align src and dst on a 32-bit (or even
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* better 64-bit) boundary
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* better 64-bit) boundary
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*/
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*/
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unsigned int csum_partial_copy(const char *src, char *dst, int len, int sum);
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unsigned int csum_partial_copy(const char *src, char *dst, int len, int sum);
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/*
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/*
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* the same as csum_partial_copy, but copies from user space.
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* the same as csum_partial_copy, but copies from user space.
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*
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*
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* here even more important to align src and dst on a 32-bit (or even
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* here even more important to align src and dst on a 32-bit (or even
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* better 64-bit) boundary
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* better 64-bit) boundary
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*/
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*/
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unsigned int csum_partial_copy_fromuser(const char *src, char *dst, int len, int sum);
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unsigned int csum_partial_copy_fromuser(const char *src, char *dst, int len, int sum);
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unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl);
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unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl);
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/*
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/*
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* Fold a partial checksum without adding pseudo headers
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* Fold a partial checksum without adding pseudo headers
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*/
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*/
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static inline unsigned short
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static inline unsigned short
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csum_fold(unsigned int sum)
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csum_fold(unsigned int sum)
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{
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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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sum = (sum & 0xffff) + (sum >> 16);
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sum = (sum & 0xffff) + (sum >> 16);
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return ~sum;
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return ~sum;
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}
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}
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/*
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/*
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* computes the checksum of the TCP/UDP pseudo-header
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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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* returns a 16-bit checksum, already complemented
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*/
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*/
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static inline unsigned short int
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static inline unsigned short int
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csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len,
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csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len,
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unsigned short proto, unsigned int sum)
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unsigned short proto, unsigned int sum)
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{
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{
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unsigned long result = saddr;
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unsigned long result = saddr;
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result += daddr;
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result += daddr;
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result += (daddr > result);
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result += (daddr > result);
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result += len;
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result += len;
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result += (len > result);
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result += (len > result);
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result += proto;
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result += proto;
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result += (proto > result);
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result += (proto > result);
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result += sum;
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result += sum;
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result += (sum > result);
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result += (sum > result);
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result = (result >> 16) + (result & 0xffff);
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result = (result >> 16) + (result & 0xffff);
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result = (result >> 16) + (result & 0xffff);
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result = (result >> 16) + (result & 0xffff);
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return ~result;
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return ~result;
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}
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}
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extern unsigned short
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extern unsigned short
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ip_compute_csum(const unsigned char * buff, int len);
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ip_compute_csum(const unsigned char * buff, int len);
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#endif /* _OR32_CHECKSUM_H */
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#endif /* _OR32_CHECKSUM_H */
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