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
39 static 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
46 static 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
54 static __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
62 static 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
79 static 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
88 static 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
96 void udp6_set_csum(bool nocheck, struct sk_buff *skb,
97 const struct in6_addr *saddr,
98 const struct in6_addr *daddr, int len);
99
100 int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto);
101 #endif
102
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