| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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, __u8 proto, __wsum csum); |
| 41 | #endif |
| 42 | |
| 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 | |
| 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 | |
| 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 | |
| 83 | #if IS_ENABLED(CONFIG_IPV6) |
| 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 | |
| 88 | __tcp_v6_send_check(skb, &np->saddr, &sk->sk_v6_daddr); |
| 89 | } |
| 90 | #endif |
| 91 | |
| 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 | |
| 104 | int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto); |
| 105 | #endif |