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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
Tom Herbert1933a782014-08-22 13:34:04 -070051static inline __wsum ip6_gro_compute_pseudo(struct sk_buff *skb, int proto)
52{
53 const struct ipv6hdr *iph = skb_gro_network_header(skb);
54
55 return ~csum_unfold(csum_ipv6_magic(&iph->saddr, &iph->daddr,
56 skb_gro_len(skb), proto, 0));
57}
58
Vlad Yasevich8663e022012-11-15 08:49:17 +000059static __inline__ __sum16 tcp_v6_check(int len,
60 const struct in6_addr *saddr,
61 const struct in6_addr *daddr,
62 __wsum base)
63{
64 return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
65}
66
67static inline void __tcp_v6_send_check(struct sk_buff *skb,
68 const struct in6_addr *saddr,
69 const struct in6_addr *daddr)
70{
71 struct tcphdr *th = tcp_hdr(skb);
72
73 if (skb->ip_summed == CHECKSUM_PARTIAL) {
74 th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0);
75 skb->csum_start = skb_transport_header(skb) - skb->head;
76 skb->csum_offset = offsetof(struct tcphdr, check);
77 } else {
78 th->check = tcp_v6_check(skb->len, saddr, daddr,
79 csum_partial(th, th->doff << 2,
80 skb->csum));
81 }
82}
83
Eric Dumazetc2bb06d2013-10-09 03:05:48 -070084#if IS_ENABLED(CONFIG_IPV6)
Vlad Yasevich8663e022012-11-15 08:49:17 +000085static inline void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb)
86{
87 struct ipv6_pinfo *np = inet6_sk(sk);
88
Eric Dumazetefe42082013-10-03 15:42:29 -070089 __tcp_v6_send_check(skb, &np->saddr, &sk->sk_v6_daddr);
Vlad Yasevich8663e022012-11-15 08:49:17 +000090}
Eric Dumazetc2bb06d2013-10-09 03:05:48 -070091#endif
Vlad Yasevich8663e022012-11-15 08:49:17 +000092
Tom Herbertaf5fcba2014-06-04 17:19:48 -070093static inline __sum16 udp_v6_check(int len,
94 const struct in6_addr *saddr,
95 const struct in6_addr *daddr,
96 __wsum base)
97{
98 return csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, base);
99}
100
101void udp6_set_csum(bool nocheck, struct sk_buff *skb,
102 const struct in6_addr *saddr,
103 const struct in6_addr *daddr, int len);
104
Cong Wangacb3e042013-01-07 20:52:40 +0000105int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106#endif