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-types.h>
22
update_csum_diff4(struct sk_buff * skb,__be32 from,__be32 to)23 static 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
update_csum_diff16(struct sk_buff * skb,__be32 * from,__be32 * to)31 static 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
42 struct 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
seg6_pernet(struct net * net)50 static inline struct seg6_pernet_data *seg6_pernet(struct net *net)
51 {
52 #if IS_ENABLED(CONFIG_IPV6)
53 return net->ipv6.seg6_data;
54 #else
55 return NULL;
56 #endif
57 }
58
59 extern int seg6_init(void);
60 extern void seg6_exit(void);
61 extern int seg6_iptunnel_init(void);
62 extern void seg6_iptunnel_exit(void);
63 extern int seg6_local_init(void);
64 extern void seg6_local_exit(void);
65
66 extern bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len);
67 extern int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh,
68 int proto);
69 extern int seg6_do_srh_inline(struct sk_buff *skb, struct ipv6_sr_hdr *osrh);
70 extern int seg6_lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr,
71 u32 tbl_id);
72 #endif
73