77 строки
2.1 KiB
C
77 строки
2.1 KiB
C
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#ifndef _ASM_IA64_CHECKSUM_H
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#define _ASM_IA64_CHECKSUM_H
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/*
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* Modified 1998, 1999
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* David Mosberger-Tang <davidm@hpl.hp.com>, Hewlett-Packard Co
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*/
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/*
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* This is a version of ip_compute_csum() optimized for IP headers,
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* which always checksum on 4 octet boundaries.
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*/
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extern unsigned short ip_fast_csum (unsigned char * iph, unsigned int ihl);
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/*
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* Computes the checksum of the TCP/UDP pseudo-header returns a 16-bit
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* checksum, already complemented
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*/
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extern 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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extern unsigned int csum_tcpudp_nofold (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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* 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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extern 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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* Same as csum_partial, but copies from src while it checksums.
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*
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* Here it is even more important to align src and dst on a 32-bit (or
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* even better 64-bit) boundary.
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*/
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extern unsigned int csum_partial_copy_from_user (const char *src, char *dst,
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int len, unsigned int sum,
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int *errp);
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extern unsigned int csum_partial_copy_nocheck (const char *src, char *dst,
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int len, unsigned int sum);
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/*
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* This routine is used for miscellaneous IP-like checksums, mainly in
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* icmp.c
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*/
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extern unsigned short ip_compute_csum (unsigned char *buff, int len);
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/*
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* Fold a partial checksum without adding pseudo headers.
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*/
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static inline unsigned short
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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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#endif /* _ASM_IA64_CHECKSUM_H */
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