2005-04-16 16:20:36 -06:00
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/*
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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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2012-11-15 01:49:17 -07:00
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#include <linux/tcp.h>
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#include <linux/ipv6.h>
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2005-04-16 16:20:36 -06:00
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#ifndef _HAVE_ARCH_IPV6_CSUM
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2013-01-07 13:52:40 -07:00
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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, unsigned short proto,
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__wsum csum);
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2005-04-16 16:20:36 -06:00
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#endif
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2012-11-15 01:49:17 -07:00
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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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2013-10-09 04:05:48 -06:00
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#if IS_ENABLED(CONFIG_IPV6)
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2012-11-15 01:49:17 -07:00
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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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ipv6: make lookups simpler and faster
TCP listener refactoring, part 4 :
To speed up inet lookups, we moved IPv4 addresses from inet to struct
sock_common
Now is time to do the same for IPv6, because it permits us to have fast
lookups for all kind of sockets, including upcoming SYN_RECV.
Getting IPv6 addresses in TCP lookups currently requires two extra cache
lines, plus a dereference (and memory stall).
inet6_sk(sk) does the dereference of inet_sk(__sk)->pinet6
This patch is way bigger than its IPv4 counter part, because for IPv4,
we could add aliases (inet_daddr, inet_rcv_saddr), while on IPv6,
it's not doable easily.
inet6_sk(sk)->daddr becomes sk->sk_v6_daddr
inet6_sk(sk)->rcv_saddr becomes sk->sk_v6_rcv_saddr
And timewait socket also have tw->tw_v6_daddr & tw->tw_v6_rcv_saddr
at the same offset.
We get rid of INET6_TW_MATCH() as INET6_MATCH() is now the generic
macro.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-10-03 16:42:29 -06:00
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__tcp_v6_send_check(skb, &np->saddr, &sk->sk_v6_daddr);
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2012-11-15 01:49:17 -07:00
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}
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2013-10-09 04:05:48 -06:00
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#endif
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2012-11-15 01:49:17 -07:00
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2013-01-07 13:52:40 -07:00
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int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto);
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2005-04-16 16:20:36 -06:00
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#endif
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