1/*
 2 *  SR-IPv6 implementation
 3 *
 4 *  Author:
 5 *  David Lebrun <david.lebrun@uclouvain.be>
 6 *
 7 *
 8 *  This program is free software; you can redistribute it and/or
 9 *      modify it under the terms of the GNU General Public License
10 *      as published by the Free Software Foundation; either version
11 *      2 of the License, or (at your option) any later version.
12 */
13
14#ifndef _NET_SEG6_H
15#define _NET_SEG6_H
16
17#include <linux/net.h>
18#include <linux/ipv6.h>
19#include <net/lwtunnel.h>
20#include <linux/seg6.h>
21#include <linux/rhashtable.h>
22
23static inline void update_csum_diff4(struct sk_buff *skb, __be32 from,
24				     __be32 to)
25{
26	__be32 diff[] = { ~from, to };
27
28	skb->csum = ~csum_partial((char *)diff, sizeof(diff), ~skb->csum);
29}
30
31static inline void update_csum_diff16(struct sk_buff *skb, __be32 *from,
32				      __be32 *to)
33{
34	__be32 diff[] = {
35		~from[0], ~from[1], ~from[2], ~from[3],
36		to[0], to[1], to[2], to[3],
37	};
38
39	skb->csum = ~csum_partial((char *)diff, sizeof(diff), ~skb->csum);
40}
41
42struct seg6_pernet_data {
43	struct mutex lock;
44	struct in6_addr __rcu *tun_src;
45#ifdef CONFIG_IPV6_SEG6_HMAC
46	struct rhashtable hmac_infos;
47#endif
48};
49
50static inline struct seg6_pernet_data *seg6_pernet(struct net *net)
51{
52	return net->ipv6.seg6_data;
53}
54
55extern int seg6_init(void);
56extern void seg6_exit(void);
57extern int seg6_iptunnel_init(void);
58extern void seg6_iptunnel_exit(void);
59
60extern bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len);
61
62#endif