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Linux/include/net/ip6_checksum.h

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

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