projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
| 3 | * operating system. INET is implemented using the BSD Socket | |
| 4 | * interface as the means of communication with the user level. | |
| 5 | * | |
| 6 | * Checksumming functions for IPv6 | |
| 7 | * | |
| 8 | * Authors: Jorge Cwik, <[email protected]> | |
| 9 | * Arnt Gulbrandsen, <[email protected]> | |
| 10 | * Borrows very liberally from tcp.c and ip.c, see those | |
| 11 | * files for more names. | |
| 12 | * | |
| 13 | * This program is free software; you can redistribute it and/or | |
| 14 | * modify it under the terms of the GNU General Public License | |
| 15 | * as published by the Free Software Foundation; either version | |
| 16 | * 2 of the License, or (at your option) any later version. | |
| 17 | */ | |
| 18 | ||
| 19 | /* | |
| 20 | * Fixes: | |
| 21 | * | |
| 22 | * Ralf Baechle : generic ipv6 checksum | |
| 23 | * <[email protected]> | |
| 24 | */ | |
| 25 | ||
| 26 | #ifndef _CHECKSUM_IPV6_H | |
| 27 | #define _CHECKSUM_IPV6_H | |
| 28 | ||
| 29 | #include <asm/types.h> | |
| 30 | #include <asm/byteorder.h> | |
| 31 | #include <net/ip.h> | |
| 32 | #include <asm/checksum.h> | |
| 33 | #include <linux/in6.h> | |
| 34 | ||
| 35 | #ifndef _HAVE_ARCH_IPV6_CSUM | |
| 36 | ||
| 56649d5d AV |
37 | static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr, |
| 38 | const struct in6_addr *daddr, | |
| 39 | __u32 len, unsigned short proto, | |
| 40 | __wsum csum) | |
| 1da177e4 LT |
41 | { |
| 42 | ||
| 43 | int carry; | |
| 44 | __u32 ulen; | |
| 45 | __u32 uproto; | |
| 56649d5d | 46 | __u32 sum = (__force u32)csum; |
| 1da177e4 | 47 | |
| 56649d5d AV |
48 | sum += (__force u32)saddr->s6_addr32[0]; |
| 49 | carry = (sum < (__force u32)saddr->s6_addr32[0]); | |
| 50 | sum += carry; | |
| 1da177e4 | 51 | |
| 56649d5d AV |
52 | sum += (__force u32)saddr->s6_addr32[1]; |
| 53 | carry = (sum < (__force u32)saddr->s6_addr32[1]); | |
| 54 | sum += carry; | |
| 1da177e4 | 55 | |
| 56649d5d AV |
56 | sum += (__force u32)saddr->s6_addr32[2]; |
| 57 | carry = (sum < (__force u32)saddr->s6_addr32[2]); | |
| 58 | sum += carry; | |
| 1da177e4 | 59 | |
| 56649d5d AV |
60 | sum += (__force u32)saddr->s6_addr32[3]; |
| 61 | carry = (sum < (__force u32)saddr->s6_addr32[3]); | |
| 62 | sum += carry; | |
| 1da177e4 | 63 | |
| 56649d5d AV |
64 | sum += (__force u32)daddr->s6_addr32[0]; |
| 65 | carry = (sum < (__force u32)daddr->s6_addr32[0]); | |
| 66 | sum += carry; | |
| 1da177e4 | 67 | |
| 56649d5d AV |
68 | sum += (__force u32)daddr->s6_addr32[1]; |
| 69 | carry = (sum < (__force u32)daddr->s6_addr32[1]); | |
| 70 | sum += carry; | |
| 1da177e4 | 71 | |
| 56649d5d AV |
72 | sum += (__force u32)daddr->s6_addr32[2]; |
| 73 | carry = (sum < (__force u32)daddr->s6_addr32[2]); | |
| 74 | sum += carry; | |
| 1da177e4 | 75 | |
| 56649d5d AV |
76 | sum += (__force u32)daddr->s6_addr32[3]; |
| 77 | carry = (sum < (__force u32)daddr->s6_addr32[3]); | |
| 78 | sum += carry; | |
| 1da177e4 | 79 | |
| 56649d5d AV |
80 | ulen = (__force u32)htonl((__u32) len); |
| 81 | sum += ulen; | |
| 82 | carry = (sum < ulen); | |
| 83 | sum += carry; | |
| 1da177e4 | 84 | |
| 56649d5d AV |
85 | uproto = (__force u32)htonl(proto); |
| 86 | sum += uproto; | |
| 87 | carry = (sum < uproto); | |
| 88 | sum += carry; | |
| 1da177e4 | 89 | |
| b23e3536 | 90 | return csum_fold((__force __wsum)sum); |
| 1da177e4 LT |
91 | } |
| 92 | ||
| 93 | #endif | |
| 94 | #endif |