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Linux/include/net/ip6_checksum.h

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  1 /* SPDX-License-Identifier: GPL-2.0-or-later */
  2 /*
  3  * INET         An implementation of the TCP/IP protocol suite for the LINUX
  4  *              operating system.  INET is implemented using the  BSD Socket
  5  *              interface as the means of communication with the user level.
  6  *
  7  *              Checksumming functions for IPv6
  8  *
  9  * Authors:     Jorge Cwik, <jorge@laser.satlink.net>
 10  *              Arnt Gulbrandsen, <agulbra@nvg.unit.no>
 11  *              Borrows very liberally from tcp.c and ip.c, see those
 12  *              files for more names.
 13  */
 14 
 15 /*
 16  *      Fixes:
 17  *
 18  *      Ralf Baechle                    :       generic ipv6 checksum
 19  *      <ralf@waldorf-gmbh.de>
 20  */
 21 
 22 #ifndef _CHECKSUM_IPV6_H
 23 #define _CHECKSUM_IPV6_H
 24 
 25 #include <asm/types.h>
 26 #include <asm/byteorder.h>
 27 #include <net/ip.h>
 28 #include <asm/checksum.h>
 29 #include <linux/in6.h>
 30 #include <linux/tcp.h>
 31 #include <linux/ipv6.h>
 32 
 33 #ifndef _HAVE_ARCH_IPV6_CSUM
 34 __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
 35                         const struct in6_addr *daddr,
 36                         __u32 len, __u8 proto, __wsum csum);
 37 #endif
 38 
 39 static inline __wsum ip6_compute_pseudo(struct sk_buff *skb, int proto)
 40 {
 41         return ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 42                                             &ipv6_hdr(skb)->daddr,
 43                                             skb->len, proto, 0));
 44 }
 45 
 46 static inline __wsum ip6_gro_compute_pseudo(struct sk_buff *skb, int proto)
 47 {
 48         const struct ipv6hdr *iph = skb_gro_network_header(skb);
 49 
 50         return ~csum_unfold(csum_ipv6_magic(&iph->saddr, &iph->daddr,
 51                                             skb_gro_len(skb), proto, 0));
 52 }
 53 
 54 static __inline__ __sum16 tcp_v6_check(int len,
 55                                    const struct in6_addr *saddr,
 56                                    const struct in6_addr *daddr,
 57                                    __wsum base)
 58 {
 59         return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
 60 }
 61 
 62 static inline void __tcp_v6_send_check(struct sk_buff *skb,
 63                                        const struct in6_addr *saddr,
 64                                        const struct in6_addr *daddr)
 65 {
 66         struct tcphdr *th = tcp_hdr(skb);
 67 
 68         if (skb->ip_summed == CHECKSUM_PARTIAL) {
 69                 th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0);
 70                 skb->csum_start = skb_transport_header(skb) - skb->head;
 71                 skb->csum_offset = offsetof(struct tcphdr, check);
 72         } else {
 73                 th->check = tcp_v6_check(skb->len, saddr, daddr,
 74                                          csum_partial(th, th->doff << 2,
 75                                                       skb->csum));
 76         }
 77 }
 78 
 79 static inline void tcp_v6_gso_csum_prep(struct sk_buff *skb)
 80 {
 81         struct ipv6hdr *ipv6h = ipv6_hdr(skb);
 82         struct tcphdr *th = tcp_hdr(skb);
 83 
 84         ipv6h->payload_len = 0;
 85         th->check = ~tcp_v6_check(0, &ipv6h->saddr, &ipv6h->daddr, 0);
 86 }
 87 
 88 static inline __sum16 udp_v6_check(int len,
 89                                    const struct in6_addr *saddr,
 90                                    const struct in6_addr *daddr,
 91                                    __wsum base)
 92 {
 93         return csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, base);
 94 }
 95 
 96 void udp6_set_csum(bool nocheck, struct sk_buff *skb,
 97                    const struct in6_addr *saddr,
 98                    const struct in6_addr *daddr, int len);
 99 
100 int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto);
101 #endif
102 

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