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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 __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
51static 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
59static __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
84#if IS_ENABLED(CONFIG_IPV6)
85static inline void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb)
86{
87 struct ipv6_pinfo *np = inet6_sk(sk);
88
89 __tcp_v6_send_check(skb, &np->saddr, &sk->sk_v6_daddr);
90}
91#endif
92
93static 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
105int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto);
106#endif
107