/* SPDX-License-Identifier: GPL-2.0-or-later *//* * 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. */ /* *	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, __u8 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__ __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); 	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);} static inline void tcp_v6_gso_csum_prep(struct sk_buff *skb){	struct ipv6hdr *ipv6h = ipv6_hdr(skb);	struct tcphdr *th = tcp_hdr(skb); 	ipv6h->payload_len = 0;	th->check = ~tcp_v6_check(0, &ipv6h->saddr, &ipv6h->daddr, 0);} 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);#endif