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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 | /* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. INET is implemented using the BSD Socket * interface as the means of communication with the user level. * * Checksumming functions for IPv6 * * Authors: Jorge Cwik, <jorge@laser.satlink.net> * Arnt Gulbrandsen, <agulbra@nvg.unit.no> * Borrows very liberally from tcp.c and ip.c, see those * files for more names. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ /* * Fixes: * * Ralf Baechle : generic ipv6 checksum * <ralf@waldorf-gmbh.de> */ #ifndef _CHECKSUM_IPV6_H #define _CHECKSUM_IPV6_H #include <asm/types.h> #include <asm/byteorder.h> #include <net/ip.h> #include <asm/checksum.h> #include <linux/in6.h> #include <linux/tcp.h> #include <linux/ipv6.h> #ifndef _HAVE_ARCH_IPV6_CSUM __sum16 csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr, __u32 len, unsigned short proto, __wsum csum); #endif static inline __wsum ip6_compute_pseudo(struct sk_buff *skb, int proto) { return ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, skb->len, proto, 0)); } static inline __wsum ip6_gro_compute_pseudo(struct sk_buff *skb, int proto) { const struct ipv6hdr *iph = skb_gro_network_header(skb); return ~csum_unfold(csum_ipv6_magic(&iph->saddr, &iph->daddr, skb_gro_len(skb), proto, 0)); } static __inline__ __sum16 tcp_v6_check(int len, const struct in6_addr *saddr, const struct in6_addr *daddr, __wsum base) { return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); } static inline void __tcp_v6_send_check(struct sk_buff *skb, const struct in6_addr *saddr, const struct in6_addr *daddr) { struct tcphdr *th = tcp_hdr(skb); if (skb->ip_summed == CHECKSUM_PARTIAL) { th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0); skb->csum_start = skb_transport_header(skb) - skb->head; skb->csum_offset = offsetof(struct tcphdr, check); } else { th->check = tcp_v6_check(skb->len, saddr, daddr, csum_partial(th, th->doff << 2, skb->csum)); } } #if IS_ENABLED(CONFIG_IPV6) static inline void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb) { struct ipv6_pinfo *np = inet6_sk(sk); __tcp_v6_send_check(skb, &np->saddr, &sk->sk_v6_daddr); } #endif static inline __sum16 udp_v6_check(int len, const struct in6_addr *saddr, const struct in6_addr *daddr, __wsum base) { return csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, base); } void udp6_set_csum(bool nocheck, struct sk_buff *skb, const struct in6_addr *saddr, const struct in6_addr *daddr, int len); int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto); #endif |