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  • Committer: Bazaar Package Importer
  • Author(s): Bastian Blank
  • Date: 2010-05-06 15:47:38 UTC
  • mto: (1.3.1) (15.1.1 sid) (4.1.1 experimental)
  • mto: This revision was merged to the branch mainline in revision 3.
  • Revision ID: james.westby@ubuntu.com-20100506154738-agoz0rlafrh1fnq7
Tags: upstream-4.0.0
Import upstream version 4.0.0

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xen/include/asm-ia64/linux/asm/checksum.h
 
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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 */