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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, <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> | |
8663e02a VY |
34 | #include <linux/tcp.h> |
35 | #include <linux/ipv6.h> | |
1da177e4 LT |
36 | |
37 | #ifndef _HAVE_ARCH_IPV6_CSUM | |
38 | ||
56649d5d AV |
39 | static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr, |
40 | const struct in6_addr *daddr, | |
41 | __u32 len, unsigned short proto, | |
42 | __wsum csum) | |
1da177e4 LT |
43 | { |
44 | ||
45 | int carry; | |
46 | __u32 ulen; | |
47 | __u32 uproto; | |
56649d5d | 48 | __u32 sum = (__force u32)csum; |
1da177e4 | 49 | |
56649d5d AV |
50 | sum += (__force u32)saddr->s6_addr32[0]; |
51 | carry = (sum < (__force u32)saddr->s6_addr32[0]); | |
52 | sum += carry; | |
1da177e4 | 53 | |
56649d5d AV |
54 | sum += (__force u32)saddr->s6_addr32[1]; |
55 | carry = (sum < (__force u32)saddr->s6_addr32[1]); | |
56 | sum += carry; | |
1da177e4 | 57 | |
56649d5d AV |
58 | sum += (__force u32)saddr->s6_addr32[2]; |
59 | carry = (sum < (__force u32)saddr->s6_addr32[2]); | |
60 | sum += carry; | |
1da177e4 | 61 | |
56649d5d AV |
62 | sum += (__force u32)saddr->s6_addr32[3]; |
63 | carry = (sum < (__force u32)saddr->s6_addr32[3]); | |
64 | sum += carry; | |
1da177e4 | 65 | |
56649d5d AV |
66 | sum += (__force u32)daddr->s6_addr32[0]; |
67 | carry = (sum < (__force u32)daddr->s6_addr32[0]); | |
68 | sum += carry; | |
1da177e4 | 69 | |
56649d5d AV |
70 | sum += (__force u32)daddr->s6_addr32[1]; |
71 | carry = (sum < (__force u32)daddr->s6_addr32[1]); | |
72 | sum += carry; | |
1da177e4 | 73 | |
56649d5d AV |
74 | sum += (__force u32)daddr->s6_addr32[2]; |
75 | carry = (sum < (__force u32)daddr->s6_addr32[2]); | |
76 | sum += carry; | |
1da177e4 | 77 | |
56649d5d AV |
78 | sum += (__force u32)daddr->s6_addr32[3]; |
79 | carry = (sum < (__force u32)daddr->s6_addr32[3]); | |
80 | sum += carry; | |
1da177e4 | 81 | |
56649d5d AV |
82 | ulen = (__force u32)htonl((__u32) len); |
83 | sum += ulen; | |
84 | carry = (sum < ulen); | |
85 | sum += carry; | |
1da177e4 | 86 | |
56649d5d AV |
87 | uproto = (__force u32)htonl(proto); |
88 | sum += uproto; | |
89 | carry = (sum < uproto); | |
90 | sum += carry; | |
1da177e4 | 91 | |
b23e3536 | 92 | return csum_fold((__force __wsum)sum); |
1da177e4 LT |
93 | } |
94 | ||
95 | #endif | |
8663e02a VY |
96 | |
97 | static __inline__ __sum16 tcp_v6_check(int len, | |
98 | const struct in6_addr *saddr, | |
99 | const struct in6_addr *daddr, | |
100 | __wsum base) | |
101 | { | |
102 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); | |
103 | } | |
104 | ||
105 | static inline void __tcp_v6_send_check(struct sk_buff *skb, | |
106 | const struct in6_addr *saddr, | |
107 | const struct in6_addr *daddr) | |
108 | { | |
109 | struct tcphdr *th = tcp_hdr(skb); | |
110 | ||
111 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
112 | th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0); | |
113 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
114 | skb->csum_offset = offsetof(struct tcphdr, check); | |
115 | } else { | |
116 | th->check = tcp_v6_check(skb->len, saddr, daddr, | |
117 | csum_partial(th, th->doff << 2, | |
118 | skb->csum)); | |
119 | } | |
120 | } | |
121 | ||
122 | static inline void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb) | |
123 | { | |
124 | struct ipv6_pinfo *np = inet6_sk(sk); | |
125 | ||
126 | __tcp_v6_send_check(skb, &np->saddr, &np->daddr); | |
127 | } | |
128 | ||
1da177e4 | 129 | #endif |