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linux-next/include/net/ip6_checksum.h
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

95 lines
2.1 KiB
C

/*
* 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__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
struct in6_addr *daddr,
__u16 len,
unsigned short proto,
unsigned int csum)
{
int carry;
__u32 ulen;
__u32 uproto;
csum += saddr->s6_addr32[0];
carry = (csum < saddr->s6_addr32[0]);
csum += carry;
csum += saddr->s6_addr32[1];
carry = (csum < saddr->s6_addr32[1]);
csum += carry;
csum += saddr->s6_addr32[2];
carry = (csum < saddr->s6_addr32[2]);
csum += carry;
csum += saddr->s6_addr32[3];
carry = (csum < saddr->s6_addr32[3]);
csum += carry;
csum += daddr->s6_addr32[0];
carry = (csum < daddr->s6_addr32[0]);
csum += carry;
csum += daddr->s6_addr32[1];
carry = (csum < daddr->s6_addr32[1]);
csum += carry;
csum += daddr->s6_addr32[2];
carry = (csum < daddr->s6_addr32[2]);
csum += carry;
csum += daddr->s6_addr32[3];
carry = (csum < daddr->s6_addr32[3]);
csum += carry;
ulen = htonl((__u32) len);
csum += ulen;
carry = (csum < ulen);
csum += carry;
uproto = htonl(proto);
csum += uproto;
carry = (csum < uproto);
csum += carry;
return csum_fold(csum);
}
#endif
#endif