| /* |
| * 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 |