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2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
1da177e4 LT |
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. | |
1da177e4 LT |
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> | |
8663e02a VY |
30 | #include <linux/tcp.h> |
31 | #include <linux/ipv6.h> | |
1da177e4 LT |
32 | |
33 | #ifndef _HAVE_ARCH_IPV6_CSUM | |
acb3e041 CW |
34 | __sum16 csum_ipv6_magic(const struct in6_addr *saddr, |
35 | const struct in6_addr *daddr, | |
1e940829 | 36 | __u32 len, __u8 proto, __wsum csum); |
1da177e4 | 37 | #endif |
8663e02a | 38 | |
e4f45b7f TH |
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 | ||
1933a785 TH |
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 | ||
8663e02a VY |
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 | ||
76eeb12b HK |
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 | ||
af5fcba7 TH |
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 | ||
acb3e041 | 100 | int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto); |
1da177e4 | 101 | #endif |