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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, <jorge@laser.satlink.net> |
9 | * Arnt Gulbrandsen, <agulbra@nvg.unit.no> |
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 | * <ralf@waldorf-gmbh.de> |
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 | |
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) |
41 | { |
42 | |
43 | int carry; |
44 | __u32 ulen; |
45 | __u32 uproto; |
46 | __u32 sum = (__force u32)csum; |
47 | |
48 | sum += (__force u32)saddr->s6_addr32[0]; |
49 | carry = (sum < (__force u32)saddr->s6_addr32[0]); |
50 | sum += carry; |
51 | |
52 | sum += (__force u32)saddr->s6_addr32[1]; |
53 | carry = (sum < (__force u32)saddr->s6_addr32[1]); |
54 | sum += carry; |
55 | |
56 | sum += (__force u32)saddr->s6_addr32[2]; |
57 | carry = (sum < (__force u32)saddr->s6_addr32[2]); |
58 | sum += carry; |
59 | |
60 | sum += (__force u32)saddr->s6_addr32[3]; |
61 | carry = (sum < (__force u32)saddr->s6_addr32[3]); |
62 | sum += carry; |
63 | |
64 | sum += (__force u32)daddr->s6_addr32[0]; |
65 | carry = (sum < (__force u32)daddr->s6_addr32[0]); |
66 | sum += carry; |
67 | |
68 | sum += (__force u32)daddr->s6_addr32[1]; |
69 | carry = (sum < (__force u32)daddr->s6_addr32[1]); |
70 | sum += carry; |
71 | |
72 | sum += (__force u32)daddr->s6_addr32[2]; |
73 | carry = (sum < (__force u32)daddr->s6_addr32[2]); |
74 | sum += carry; |
75 | |
76 | sum += (__force u32)daddr->s6_addr32[3]; |
77 | carry = (sum < (__force u32)daddr->s6_addr32[3]); |
78 | sum += carry; |
79 | |
80 | ulen = (__force u32)htonl((__u32) len); |
81 | sum += ulen; |
82 | carry = (sum < ulen); |
83 | sum += carry; |
84 | |
85 | uproto = (__force u32)htonl(proto); |
86 | sum += uproto; |
87 | carry = (sum < uproto); |
88 | sum += carry; |
89 | |
90 | return csum_fold((__force __wsum)sum); |
91 | } |
92 | |
93 | #endif |
94 | #endif |
95 |
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