/*
   * INET		An implementation of the TCP/IP protocol suite for the LINUX
   *		operating system.  INET is implemented using the  BSD Socket
   *		interface as the means of communication with the user level.
   *
   *		Checksumming functions for IPv6
   *
   * Authors:	Jorge Cwik, <jorge@laser.satlink.net>
   *		Arnt Gulbrandsen, <agulbra@nvg.unit.no>
   *		Borrows very liberally from tcp.c and ip.c, see those
   *		files for more names.
   *
   *		This program is free software; you can redistribute it and/or
   *		modify it under the terms of the GNU General Public License
   *		as published by the Free Software Foundation; either version
   *		2 of the License, or (at your option) any later version.
   */
  
  /*
   *	Fixes:
   *
   *	Ralf Baechle			:	generic ipv6 checksum
   *	<ralf@waldorf-gmbh.de>
   */
  
  #ifndef _CHECKSUM_IPV6_H
  #define _CHECKSUM_IPV6_H
  
  #include <asm/types.h>
  #include <asm/byteorder.h>
  #include <net/ip.h>
  #include <asm/checksum.h>
  #include <linux/in6.h>
  
  #ifndef _HAVE_ARCH_IPV6_CSUM

  static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
  					  const struct in6_addr *daddr,
  					  __u32 len, unsigned short proto,
  					  __wsum csum)

  {
  
  	int carry;
  	__u32 ulen;
  	__u32 uproto;

  	__u32 sum = (__force u32)csum;

  	sum += (__force u32)saddr->s6_addr32[0];
  	carry = (sum < (__force u32)saddr->s6_addr32[0]);
  	sum += carry;

  	sum += (__force u32)saddr->s6_addr32[1];
  	carry = (sum < (__force u32)saddr->s6_addr32[1]);
  	sum += carry;

  	sum += (__force u32)saddr->s6_addr32[2];
  	carry = (sum < (__force u32)saddr->s6_addr32[2]);
  	sum += carry;

  	sum += (__force u32)saddr->s6_addr32[3];
  	carry = (sum < (__force u32)saddr->s6_addr32[3]);
  	sum += carry;

  	sum += (__force u32)daddr->s6_addr32[0];
  	carry = (sum < (__force u32)daddr->s6_addr32[0]);
  	sum += carry;

  	sum += (__force u32)daddr->s6_addr32[1];
  	carry = (sum < (__force u32)daddr->s6_addr32[1]);
  	sum += carry;

  	sum += (__force u32)daddr->s6_addr32[2];
  	carry = (sum < (__force u32)daddr->s6_addr32[2]);
  	sum += carry;

  	sum += (__force u32)daddr->s6_addr32[3];
  	carry = (sum < (__force u32)daddr->s6_addr32[3]);
  	sum += carry;

  	ulen = (__force u32)htonl((__u32) len);
  	sum += ulen;
  	carry = (sum < ulen);
  	sum += carry;

  	uproto = (__force u32)htonl(proto);
  	sum += uproto;
  	carry = (sum < uproto);
  	sum += carry;

  	return csum_fold((__force __wsum)sum);

  }
  
  #endif
  #endif