blob: 55236cb711745fc76ef4c897bcf70e957b34611c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Vlad Yasevich8663e022012-11-15 08:49:17 +000034#include <linux/tcp.h>
35#include <linux/ipv6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
37#ifndef _HAVE_ARCH_IPV6_CSUM
Cong Wangacb3e042013-01-07 20:52:40 +000038__sum16 csum_ipv6_magic(const struct in6_addr *saddr,
39 const struct in6_addr *daddr,
40 __u32 len, unsigned short proto,
41 __wsum csum);
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#endif
Vlad Yasevich8663e022012-11-15 08:49:17 +000043
Tom Herberte4f45b72014-05-02 16:29:51 -070044static inline __wsum ip6_compute_pseudo(struct sk_buff *skb, int proto)
45{
46 return ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
47 &ipv6_hdr(skb)->daddr,
48 skb->len, proto, 0));
49}
50
Vlad Yasevich8663e022012-11-15 08:49:17 +000051static __inline__ __sum16 tcp_v6_check(int len,
52 const struct in6_addr *saddr,
53 const struct in6_addr *daddr,
54 __wsum base)
55{
56 return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
57}
58
59static inline void __tcp_v6_send_check(struct sk_buff *skb,
60 const struct in6_addr *saddr,
61 const struct in6_addr *daddr)
62{
63 struct tcphdr *th = tcp_hdr(skb);
64
65 if (skb->ip_summed == CHECKSUM_PARTIAL) {
66 th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0);
67 skb->csum_start = skb_transport_header(skb) - skb->head;
68 skb->csum_offset = offsetof(struct tcphdr, check);
69 } else {
70 th->check = tcp_v6_check(skb->len, saddr, daddr,
71 csum_partial(th, th->doff << 2,
72 skb->csum));
73 }
74}
75
Eric Dumazetc2bb06d2013-10-09 03:05:48 -070076#if IS_ENABLED(CONFIG_IPV6)
Vlad Yasevich8663e022012-11-15 08:49:17 +000077static inline void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb)
78{
79 struct ipv6_pinfo *np = inet6_sk(sk);
80
Eric Dumazetefe42082013-10-03 15:42:29 -070081 __tcp_v6_send_check(skb, &np->saddr, &sk->sk_v6_daddr);
Vlad Yasevich8663e022012-11-15 08:49:17 +000082}
Eric Dumazetc2bb06d2013-10-09 03:05:48 -070083#endif
Vlad Yasevich8663e022012-11-15 08:49:17 +000084
Tom Herbertaf5fcba2014-06-04 17:19:48 -070085static inline __sum16 udp_v6_check(int len,
86 const struct in6_addr *saddr,
87 const struct in6_addr *daddr,
88 __wsum base)
89{
90 return csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, base);
91}
92
93void udp6_set_csum(bool nocheck, struct sk_buff *skb,
94 const struct in6_addr *saddr,
95 const struct in6_addr *daddr, int len);
96
Cong Wangacb3e042013-01-07 20:52:40 +000097int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098#endif