projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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, <[email protected]> | |
| 9 | * Arnt Gulbrandsen, <[email protected]> | |
| 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 | * <[email protected]> | |
| 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> | |
| 8663e02a VY |
34 | #include <linux/tcp.h> |
| 35 | #include <linux/ipv6.h> | |
| 1da177e4 LT |
36 | |
| 37 | #ifndef _HAVE_ARCH_IPV6_CSUM | |
| acb3e041 CW |
38 | __sum16 csum_ipv6_magic(const struct in6_addr *saddr, |
| 39 | const struct in6_addr *daddr, | |
| 1e940829 | 40 | __u32 len, __u8 proto, __wsum csum); |
| 1da177e4 | 41 | #endif |
| 8663e02a | 42 | |
| e4f45b7f TH |
43 | static inline __wsum ip6_compute_pseudo(struct sk_buff *skb, int proto) |
| 44 | { | |
| 45 | return ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, | |
| 46 | &ipv6_hdr(skb)->daddr, | |
| 47 | skb->len, proto, 0)); | |
| 48 | } | |
| 49 | ||
| 1933a785 TH |
50 | static inline __wsum ip6_gro_compute_pseudo(struct sk_buff *skb, int proto) |
| 51 | { | |
| 52 | const struct ipv6hdr *iph = skb_gro_network_header(skb); | |
| 53 | ||
| 54 | return ~csum_unfold(csum_ipv6_magic(&iph->saddr, &iph->daddr, | |
| 55 | skb_gro_len(skb), proto, 0)); | |
| 56 | } | |
| 57 | ||
| 8663e02a VY |
58 | static __inline__ __sum16 tcp_v6_check(int len, |
| 59 | const struct in6_addr *saddr, | |
| 60 | const struct in6_addr *daddr, | |
| 61 | __wsum base) | |
| 62 | { | |
| 63 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); | |
| 64 | } | |
| 65 | ||
| 66 | static inline void __tcp_v6_send_check(struct sk_buff *skb, | |
| 67 | const struct in6_addr *saddr, | |
| 68 | const struct in6_addr *daddr) | |
| 69 | { | |
| 70 | struct tcphdr *th = tcp_hdr(skb); | |
| 71 | ||
| 72 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
| 73 | th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0); | |
| 74 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
| 75 | skb->csum_offset = offsetof(struct tcphdr, check); | |
| 76 | } else { | |
| 77 | th->check = tcp_v6_check(skb->len, saddr, daddr, | |
| 78 | csum_partial(th, th->doff << 2, | |
| 79 | skb->csum)); | |
| 80 | } | |
| 81 | } | |
| 82 | ||
| c2bb06db | 83 | #if IS_ENABLED(CONFIG_IPV6) |
| 8663e02a VY |
84 | static inline void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb) |
| 85 | { | |
| 86 | struct ipv6_pinfo *np = inet6_sk(sk); | |
| 87 | ||
| efe4208f | 88 | __tcp_v6_send_check(skb, &np->saddr, &sk->sk_v6_daddr); |
| 8663e02a | 89 | } |
| c2bb06db | 90 | #endif |
| 8663e02a | 91 | |
| af5fcba7 TH |
92 | static inline __sum16 udp_v6_check(int len, |
| 93 | const struct in6_addr *saddr, | |
| 94 | const struct in6_addr *daddr, | |
| 95 | __wsum base) | |
| 96 | { | |
| 97 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, base); | |
| 98 | } | |
| 99 | ||
| 100 | void udp6_set_csum(bool nocheck, struct sk_buff *skb, | |
| 101 | const struct in6_addr *saddr, | |
| 102 | const struct in6_addr *daddr, int len); | |
| 103 | ||
| acb3e041 | 104 | int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto); |
| 1da177e4 | 105 | #endif |