107 lines
2.9 KiB
C
107 lines
2.9 KiB
C
/*
|
|
* 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
|