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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#include <linux/tcp.h>
35#include <linux/ipv6.h>
36
37#ifndef _HAVE_ARCH_IPV6_CSUM
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);
42#endif
43
44static __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
52static 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
69#if IS_ENABLED(CONFIG_IPV6)
70static inline void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb)
71{
72 struct ipv6_pinfo *np = inet6_sk(sk);
73
74 __tcp_v6_send_check(skb, &np->saddr, &sk->sk_v6_daddr);
75}
76#endif
77
78int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto);
79#endif
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * Checksumming functions for IPv6
8 *
9 * Authors: Jorge Cwik, <jorge@laser.satlink.net>
10 * Arnt Gulbrandsen, <agulbra@nvg.unit.no>
11 * Borrows very liberally from tcp.c and ip.c, see those
12 * files for more names.
13 */
14
15/*
16 * Fixes:
17 *
18 * Ralf Baechle : generic ipv6 checksum
19 * <ralf@waldorf-gmbh.de>
20 */
21
22#ifndef _CHECKSUM_IPV6_H
23#define _CHECKSUM_IPV6_H
24
25#include <asm/types.h>
26#include <asm/byteorder.h>
27#include <net/ip.h>
28#include <asm/checksum.h>
29#include <linux/in6.h>
30#include <linux/tcp.h>
31#include <linux/ipv6.h>
32
33#ifndef _HAVE_ARCH_IPV6_CSUM
34__sum16 csum_ipv6_magic(const struct in6_addr *saddr,
35 const struct in6_addr *daddr,
36 __u32 len, __u8 proto, __wsum csum);
37#endif
38
39static inline __wsum ip6_compute_pseudo(struct sk_buff *skb, int proto)
40{
41 return ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
42 &ipv6_hdr(skb)->daddr,
43 skb->len, proto, 0));
44}
45
46static inline __wsum ip6_gro_compute_pseudo(struct sk_buff *skb, int proto)
47{
48 const struct ipv6hdr *iph = skb_gro_network_header(skb);
49
50 return ~csum_unfold(csum_ipv6_magic(&iph->saddr, &iph->daddr,
51 skb_gro_len(skb), proto, 0));
52}
53
54static __inline__ __sum16 tcp_v6_check(int len,
55 const struct in6_addr *saddr,
56 const struct in6_addr *daddr,
57 __wsum base)
58{
59 return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
60}
61
62static inline void __tcp_v6_send_check(struct sk_buff *skb,
63 const struct in6_addr *saddr,
64 const struct in6_addr *daddr)
65{
66 struct tcphdr *th = tcp_hdr(skb);
67
68 if (skb->ip_summed == CHECKSUM_PARTIAL) {
69 th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0);
70 skb->csum_start = skb_transport_header(skb) - skb->head;
71 skb->csum_offset = offsetof(struct tcphdr, check);
72 } else {
73 th->check = tcp_v6_check(skb->len, saddr, daddr,
74 csum_partial(th, th->doff << 2,
75 skb->csum));
76 }
77}
78
79#if IS_ENABLED(CONFIG_IPV6)
80static inline void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb)
81{
82 struct ipv6_pinfo *np = inet6_sk(sk);
83
84 __tcp_v6_send_check(skb, &np->saddr, &sk->sk_v6_daddr);
85}
86#endif
87
88static inline __sum16 udp_v6_check(int len,
89 const struct in6_addr *saddr,
90 const struct in6_addr *daddr,
91 __wsum base)
92{
93 return csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, base);
94}
95
96void udp6_set_csum(bool nocheck, struct sk_buff *skb,
97 const struct in6_addr *saddr,
98 const struct in6_addr *daddr, int len);
99
100int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto);
101#endif