linux/include/net/seg6.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 *  SR-IPv6 implementation
 *
 *  Author:
 *  David Lebrun <[email protected]>
 */

#ifndef _NET_SEG6_H
#define _NET_SEG6_H

#include <linux/net.h>
#include <linux/ipv6.h>
#include <linux/seg6.h>
#include <linux/rhashtable-types.h>

static inline void update_csum_diff4(struct sk_buff *skb, __be32 from,
				     __be32 to)
{ … }

static inline void update_csum_diff16(struct sk_buff *skb, __be32 *from,
				      __be32 *to)
{ … }

struct seg6_pernet_data { … };

static inline struct seg6_pernet_data *seg6_pernet(struct net *net)
{ … }

extern int seg6_init(void);
extern void seg6_exit(void);
#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
extern int seg6_iptunnel_init(void);
extern void seg6_iptunnel_exit(void);
extern int seg6_local_init(void);
extern void seg6_local_exit(void);
#else
static inline int seg6_iptunnel_init(void) { return 0; }
static inline void seg6_iptunnel_exit(void) {}
static inline int seg6_local_init(void) { return 0; }
static inline void seg6_local_exit(void) {}
#endif

extern bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len, bool reduced);
extern struct ipv6_sr_hdr *seg6_get_srh(struct sk_buff *skb, int flags);
extern void seg6_icmp_srh(struct sk_buff *skb, struct inet6_skb_parm *opt);
extern int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh,
			     int proto);
extern int seg6_do_srh_inline(struct sk_buff *skb, struct ipv6_sr_hdr *osrh);
extern int seg6_lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr,
			       u32 tbl_id);

/* If the packet which invoked an ICMP error contains an SRH return
 * the true destination address from within the SRH, otherwise use the
 * destination address in the IP header.
 */
static inline const struct in6_addr *seg6_get_daddr(struct sk_buff *skb,
						    struct inet6_skb_parm *opt)
{ … }


#endif