106 строки
2.9 KiB
C
106 строки
2.9 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Checksumming functions for IPv6
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*
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* Authors: Jorge Cwik, <jorge@laser.satlink.net>
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* Arnt Gulbrandsen, <agulbra@nvg.unit.no>
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* Borrows very liberally from tcp.c and ip.c, see those
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* files for more names.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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/*
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* Fixes:
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*
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* Ralf Baechle : generic ipv6 checksum
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* <ralf@waldorf-gmbh.de>
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*/
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#ifndef _CHECKSUM_IPV6_H
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#define _CHECKSUM_IPV6_H
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#include <asm/types.h>
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#include <asm/byteorder.h>
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#include <net/ip.h>
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#include <asm/checksum.h>
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#include <linux/in6.h>
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#include <linux/tcp.h>
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#include <linux/ipv6.h>
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#ifndef _HAVE_ARCH_IPV6_CSUM
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__sum16 csum_ipv6_magic(const struct in6_addr *saddr,
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const struct in6_addr *daddr,
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__u32 len, __u8 proto, __wsum csum);
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#endif
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static inline __wsum ip6_compute_pseudo(struct sk_buff *skb, int proto)
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{
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return ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
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&ipv6_hdr(skb)->daddr,
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skb->len, proto, 0));
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}
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static inline __wsum ip6_gro_compute_pseudo(struct sk_buff *skb, int proto)
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{
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const struct ipv6hdr *iph = skb_gro_network_header(skb);
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return ~csum_unfold(csum_ipv6_magic(&iph->saddr, &iph->daddr,
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skb_gro_len(skb), proto, 0));
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}
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static __inline__ __sum16 tcp_v6_check(int len,
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const struct in6_addr *saddr,
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const struct in6_addr *daddr,
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__wsum base)
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{
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return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
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}
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static inline void __tcp_v6_send_check(struct sk_buff *skb,
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const struct in6_addr *saddr,
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const struct in6_addr *daddr)
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{
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struct tcphdr *th = tcp_hdr(skb);
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if (skb->ip_summed == CHECKSUM_PARTIAL) {
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th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0);
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skb->csum_start = skb_transport_header(skb) - skb->head;
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skb->csum_offset = offsetof(struct tcphdr, check);
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} else {
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th->check = tcp_v6_check(skb->len, saddr, daddr,
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csum_partial(th, th->doff << 2,
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skb->csum));
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}
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}
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#if IS_ENABLED(CONFIG_IPV6)
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static inline void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb)
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{
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struct ipv6_pinfo *np = inet6_sk(sk);
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__tcp_v6_send_check(skb, &np->saddr, &sk->sk_v6_daddr);
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}
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#endif
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static inline __sum16 udp_v6_check(int len,
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const struct in6_addr *saddr,
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const struct in6_addr *daddr,
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__wsum base)
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{
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return csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, base);
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}
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void udp6_set_csum(bool nocheck, struct sk_buff *skb,
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const struct in6_addr *saddr,
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const struct in6_addr *daddr, int len);
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int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto);
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#endif
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