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.
6 * Checksumming functions for IPv6
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.
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.
22 * Ralf Baechle : generic ipv6 checksum
23 * <ralf@waldorf-gmbh.de>
26 #ifndef _CHECKSUM_IPV6_H
27 #define _CHECKSUM_IPV6_H
29 #include <asm/types.h>
30 #include <asm/byteorder.h>
32 #include <asm/checksum.h>
33 #include <linux/in6.h>
34 #include <linux/tcp.h>
35 #include <linux/ipv6.h>
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,
44 static __inline__ __sum16 tcp_v6_check(int len,
45 const struct in6_addr *saddr,
46 const struct in6_addr *daddr,
49 return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
52 static inline void __tcp_v6_send_check(struct sk_buff *skb,
53 const struct in6_addr *saddr,
54 const struct in6_addr *daddr)
56 struct tcphdr *th = tcp_hdr(skb);
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);
63 th->check = tcp_v6_check(skb->len, saddr, daddr,
64 csum_partial(th, th->doff << 2,
69 #if IS_ENABLED(CONFIG_IPV6)
70 static inline void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb)
72 struct ipv6_pinfo *np = inet6_sk(sk);
74 __tcp_v6_send_check(skb, &np->saddr, &sk->sk_v6_daddr);
78 int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto);