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 <linux/seg6.h>
20#include <linux/rhashtable-types.h>
21
22static inline void update_csum_diff4(struct sk_buff *skb, __be32 from,
23 __be32 to)
24{
25 __be32 diff[] = { ~from, to };
26
27 skb->csum = ~csum_partial((char *)diff, sizeof(diff), ~skb->csum);
28}
29
30static inline void update_csum_diff16(struct sk_buff *skb, __be32 *from,
31 __be32 *to)
32{
33 __be32 diff[] = {
34 ~from[0], ~from[1], ~from[2], ~from[3],
35 to[0], to[1], to[2], to[3],
36 };
37
38 skb->csum = ~csum_partial((char *)diff, sizeof(diff), ~skb->csum);
39}
40
41struct seg6_pernet_data {
42 struct mutex lock;
43 struct in6_addr __rcu *tun_src;
44#ifdef CONFIG_IPV6_SEG6_HMAC
45 struct rhashtable hmac_infos;
46#endif
47};
48
49static inline struct seg6_pernet_data *seg6_pernet(struct net *net)
50{
51#if IS_ENABLED(CONFIG_IPV6)
52 return net->ipv6.seg6_data;
53#else
54 return NULL;
55#endif
56}
57
58extern int seg6_init(void);
59extern void seg6_exit(void);
60extern int seg6_iptunnel_init(void);
61extern void seg6_iptunnel_exit(void);
62extern int seg6_local_init(void);
63extern void seg6_local_exit(void);
64
65extern bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len);
66extern int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh,
67 int proto);
68extern int seg6_do_srh_inline(struct sk_buff *skb, struct ipv6_sr_hdr *osrh);
69extern int seg6_lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr,
70 u32 tbl_id);
71#endif
72