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[karo-tx-linux.git] / include / net / ip6_checksum.h
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
44 static __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
52 static 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)
70 static 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
78 int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto);
79 #endif