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(n: csum_ipv6_magic(saddr: &ipv6_hdr(skb)->saddr, |
42 | daddr: &ipv6_hdr(skb)->daddr, |
43 | len: skb->len, proto, sum: 0)); |
44 | } |
45 | |
46 | static __inline__ __sum16 tcp_v6_check(int len, |
47 | const struct in6_addr *saddr, |
48 | const struct in6_addr *daddr, |
49 | __wsum base) |
50 | { |
51 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, sum: base); |
52 | } |
53 | |
54 | static inline void __tcp_v6_send_check(struct sk_buff *skb, |
55 | const struct in6_addr *saddr, |
56 | const struct in6_addr *daddr) |
57 | { |
58 | struct tcphdr *th = tcp_hdr(skb); |
59 | |
60 | th->check = ~tcp_v6_check(len: skb->len, saddr, daddr, base: 0); |
61 | skb->csum_start = skb_transport_header(skb) - skb->head; |
62 | skb->csum_offset = offsetof(struct tcphdr, check); |
63 | } |
64 | |
65 | static inline void tcp_v6_gso_csum_prep(struct sk_buff *skb) |
66 | { |
67 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
68 | struct tcphdr *th = tcp_hdr(skb); |
69 | |
70 | ipv6h->payload_len = 0; |
71 | th->check = ~tcp_v6_check(len: 0, saddr: &ipv6h->saddr, daddr: &ipv6h->daddr, base: 0); |
72 | } |
73 | |
74 | static inline __sum16 udp_v6_check(int len, |
75 | const struct in6_addr *saddr, |
76 | const struct in6_addr *daddr, |
77 | __wsum base) |
78 | { |
79 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, sum: base); |
80 | } |
81 | |
82 | void udp6_set_csum(bool nocheck, struct sk_buff *skb, |
83 | const struct in6_addr *saddr, |
84 | const struct in6_addr *daddr, int len); |
85 | |
86 | int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto); |
87 | #endif |
88 | |