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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 | |
acb3e041 CW |
38 | __sum16 csum_ipv6_magic(const struct in6_addr *saddr, |
39 | const struct in6_addr *daddr, | |
40 | __u32 len, unsigned short proto, | |
41 | __wsum csum); | |
1da177e4 | 42 | #endif |
8663e02a VY |
43 | |
44 | static __inline__ __sum16 tcp_v6_check(int len, | |
45 | const struct in6_addr *saddr, | |
46 | const struct in6_addr *daddr, | |
47 | __wsum base) | |
48 | { | |
49 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); | |
50 | } | |
51 | ||
52 | static inline void __tcp_v6_send_check(struct sk_buff *skb, | |
53 | const struct in6_addr *saddr, | |
54 | const struct in6_addr *daddr) | |
55 | { | |
56 | struct tcphdr *th = tcp_hdr(skb); | |
57 | ||
58 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
59 | th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0); | |
60 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
61 | skb->csum_offset = offsetof(struct tcphdr, check); | |
62 | } else { | |
63 | th->check = tcp_v6_check(skb->len, saddr, daddr, | |
64 | csum_partial(th, th->doff << 2, | |
65 | skb->csum)); | |
66 | } | |
67 | } | |
68 | ||
c2bb06db | 69 | #if IS_ENABLED(CONFIG_IPV6) |
8663e02a VY |
70 | static inline void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb) |
71 | { | |
72 | struct ipv6_pinfo *np = inet6_sk(sk); | |
73 | ||
efe4208f | 74 | __tcp_v6_send_check(skb, &np->saddr, &sk->sk_v6_daddr); |
8663e02a | 75 | } |
c2bb06db | 76 | #endif |
8663e02a | 77 | |
acb3e041 | 78 | int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto); |
1da177e4 | 79 | #endif |