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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
35#ifndef _HAVE_ARCH_IPV6_CSUM
36
37static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
38 const struct in6_addr *daddr,
39 __u32 len, unsigned short proto,
40 __wsum csum)
41{
42
43 int carry;
44 __u32 ulen;
45 __u32 uproto;
46 __u32 sum = (__force u32)csum;
47
48 sum += (__force u32)saddr->s6_addr32[0];
49 carry = (sum < (__force u32)saddr->s6_addr32[0]);
50 sum += carry;
51
52 sum += (__force u32)saddr->s6_addr32[1];
53 carry = (sum < (__force u32)saddr->s6_addr32[1]);
54 sum += carry;
55
56 sum += (__force u32)saddr->s6_addr32[2];
57 carry = (sum < (__force u32)saddr->s6_addr32[2]);
58 sum += carry;
59
60 sum += (__force u32)saddr->s6_addr32[3];
61 carry = (sum < (__force u32)saddr->s6_addr32[3]);
62 sum += carry;
63
64 sum += (__force u32)daddr->s6_addr32[0];
65 carry = (sum < (__force u32)daddr->s6_addr32[0]);
66 sum += carry;
67
68 sum += (__force u32)daddr->s6_addr32[1];
69 carry = (sum < (__force u32)daddr->s6_addr32[1]);
70 sum += carry;
71
72 sum += (__force u32)daddr->s6_addr32[2];
73 carry = (sum < (__force u32)daddr->s6_addr32[2]);
74 sum += carry;
75
76 sum += (__force u32)daddr->s6_addr32[3];
77 carry = (sum < (__force u32)daddr->s6_addr32[3]);
78 sum += carry;
79
80 ulen = (__force u32)htonl((__u32) len);
81 sum += ulen;
82 carry = (sum < ulen);
83 sum += carry;
84
85 uproto = (__force u32)htonl(proto);
86 sum += uproto;
87 carry = (sum < uproto);
88 sum += carry;
89
90 return csum_fold((__force __wsum)sum);
91}
92
93#endif
94#endif
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