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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/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * Checksumming functions for IPv6
8 *
9 * Authors: Jorge Cwik, <jorge@laser.satlink.net>
10 * Arnt Gulbrandsen, <agulbra@nvg.unit.no>
11 * Borrows very liberally from tcp.c and ip.c, see those
12 * files for more names.
13 */
14
15/*
16 * Fixes:
17 *
18 * Ralf Baechle : generic ipv6 checksum
19 * <ralf@waldorf-gmbh.de>
20 */
21
22#ifndef _CHECKSUM_IPV6_H
23#define _CHECKSUM_IPV6_H
24
25#include <asm/types.h>
26#include <asm/byteorder.h>
27#include <net/ip.h>
28#include <asm/checksum.h>
29#include <linux/in6.h>
30#include <linux/tcp.h>
31#include <linux/ipv6.h>
32
33#ifndef _HAVE_ARCH_IPV6_CSUM
34__sum16 csum_ipv6_magic(const struct in6_addr *saddr,
35 const struct in6_addr *daddr,
36 __u32 len, __u8 proto, __wsum csum);
37#endif
38
39static inline __wsum ip6_compute_pseudo(struct sk_buff *skb, int proto)
40{
41 return ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
42 &ipv6_hdr(skb)->daddr,
43 skb->len, proto, 0));
44}
45
46static inline __wsum ip6_gro_compute_pseudo(struct sk_buff *skb, int proto)
47{
48 const struct ipv6hdr *iph = skb_gro_network_header(skb);
49
50 return ~csum_unfold(csum_ipv6_magic(&iph->saddr, &iph->daddr,
51 skb_gro_len(skb), proto, 0));
52}
53
54static __inline__ __sum16 tcp_v6_check(int len,
55 const struct in6_addr *saddr,
56 const struct in6_addr *daddr,
57 __wsum base)
58{
59 return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
60}
61
62static inline void __tcp_v6_send_check(struct sk_buff *skb,
63 const struct in6_addr *saddr,
64 const struct in6_addr *daddr)
65{
66 struct tcphdr *th = tcp_hdr(skb);
67
68 if (skb->ip_summed == CHECKSUM_PARTIAL) {
69 th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0);
70 skb->csum_start = skb_transport_header(skb) - skb->head;
71 skb->csum_offset = offsetof(struct tcphdr, check);
72 } else {
73 th->check = tcp_v6_check(skb->len, saddr, daddr,
74 csum_partial(th, th->doff << 2,
75 skb->csum));
76 }
77}
78
79static inline void tcp_v6_gso_csum_prep(struct sk_buff *skb)
80{
81 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
82 struct tcphdr *th = tcp_hdr(skb);
83
84 ipv6h->payload_len = 0;
85 th->check = ~tcp_v6_check(0, &ipv6h->saddr, &ipv6h->daddr, 0);
86}
87
88static inline __sum16 udp_v6_check(int len,
89 const struct in6_addr *saddr,
90 const struct in6_addr *daddr,
91 __wsum base)
92{
93 return csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, base);
94}
95
96void udp6_set_csum(bool nocheck, struct sk_buff *skb,
97 const struct in6_addr *saddr,
98 const struct in6_addr *daddr, int len);
99
100int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto);
101#endif