Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[firefly-linux-kernel-4.4.55.git] / include / net / ip6_checksum.h
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
44 static inline __wsum ip6_compute_pseudo(struct sk_buff *skb, int proto)
45 {
46         return ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
47                                             &ipv6_hdr(skb)->daddr,
48                                             skb->len, proto, 0));
49 }
50
51 static inline __wsum ip6_gro_compute_pseudo(struct sk_buff *skb, int proto)
52 {
53         const struct ipv6hdr *iph = skb_gro_network_header(skb);
54
55         return ~csum_unfold(csum_ipv6_magic(&iph->saddr, &iph->daddr,
56                                             skb_gro_len(skb), proto, 0));
57 }
58
59 static __inline__ __sum16 tcp_v6_check(int len,
60                                    const struct in6_addr *saddr,
61                                    const struct in6_addr *daddr,
62                                    __wsum base)
63 {
64         return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
65 }
66
67 static inline void __tcp_v6_send_check(struct sk_buff *skb,
68                                        const struct in6_addr *saddr,
69                                        const struct in6_addr *daddr)
70 {
71         struct tcphdr *th = tcp_hdr(skb);
72
73         if (skb->ip_summed == CHECKSUM_PARTIAL) {
74                 th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0);
75                 skb->csum_start = skb_transport_header(skb) - skb->head;
76                 skb->csum_offset = offsetof(struct tcphdr, check);
77         } else {
78                 th->check = tcp_v6_check(skb->len, saddr, daddr,
79                                          csum_partial(th, th->doff << 2,
80                                                       skb->csum));
81         }
82 }
83
84 #if IS_ENABLED(CONFIG_IPV6)
85 static inline void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb)
86 {
87         struct ipv6_pinfo *np = inet6_sk(sk);
88
89         __tcp_v6_send_check(skb, &np->saddr, &sk->sk_v6_daddr);
90 }
91 #endif
92
93 static inline __sum16 udp_v6_check(int len,
94                                    const struct in6_addr *saddr,
95                                    const struct in6_addr *daddr,
96                                    __wsum base)
97 {
98         return csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, base);
99 }
100
101 void udp6_set_csum(bool nocheck, struct sk_buff *skb,
102                    const struct in6_addr *saddr,
103                    const struct in6_addr *daddr, int len);
104
105 int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto);
106 #endif