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
);
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