cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ip6_checksum.h (2355B)

      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
     39static 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
     46static __inline__ __sum16 tcp_v6_check(int len,
     47				   const struct in6_addr *saddr,
     48				   const struct in6_addr *daddr,
     49				   __wsum base)
     50{
     51	return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
     52}
     53
     54static inline void __tcp_v6_send_check(struct sk_buff *skb,
     55				       const struct in6_addr *saddr,
     56				       const struct in6_addr *daddr)
     57{
     58	struct tcphdr *th = tcp_hdr(skb);
     59
     60	th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0);
     61	skb->csum_start = skb_transport_header(skb) - skb->head;
     62	skb->csum_offset = offsetof(struct tcphdr, check);
     63}
     64
     65static inline void tcp_v6_gso_csum_prep(struct sk_buff *skb)
     66{
     67	struct ipv6hdr *ipv6h = ipv6_hdr(skb);
     68	struct tcphdr *th = tcp_hdr(skb);
     69
     70	ipv6h->payload_len = 0;
     71	th->check = ~tcp_v6_check(0, &ipv6h->saddr, &ipv6h->daddr, 0);
     72}
     73
     74static inline __sum16 udp_v6_check(int len,
     75				   const struct in6_addr *saddr,
     76				   const struct in6_addr *daddr,
     77				   __wsum base)
     78{
     79	return csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, base);
     80}
     81
     82void udp6_set_csum(bool nocheck, struct sk_buff *skb,
     83		   const struct in6_addr *saddr,
     84		   const struct in6_addr *daddr, int len);
     85
     86int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto);
     87#endif