LXR linux/include/net/ip6

   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
  43static 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
  50static 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
  58static __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
  66static 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)
  84static 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
  92static 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
 100void udp6_set_csum(bool nocheck, struct sk_buff *skb,
 101                   const struct in6_addr *saddr,
 102                   const struct in6_addr *daddr, int len);
 103
 104int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto);
 105#endif
 106