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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * SR-IPv6 implementation
4 *
5 * Author:
6 * David Lebrun <david.lebrun@uclouvain.be>
7 */
8
9#ifndef _NET_SEG6_H
10#define _NET_SEG6_H
11
12#include <linux/net.h>
13#include <linux/ipv6.h>
14#include <linux/seg6.h>
15#include <linux/rhashtable-types.h>
16
17static inline void update_csum_diff4(struct sk_buff *skb, __be32 from,
18 __be32 to)
19{
20 __be32 diff[] = { ~from, to };
21
22 skb->csum = ~csum_partial((char *)diff, sizeof(diff), ~skb->csum);
23}
24
25static inline void update_csum_diff16(struct sk_buff *skb, __be32 *from,
26 __be32 *to)
27{
28 __be32 diff[] = {
29 ~from[0], ~from[1], ~from[2], ~from[3],
30 to[0], to[1], to[2], to[3],
31 };
32
33 skb->csum = ~csum_partial((char *)diff, sizeof(diff), ~skb->csum);
34}
35
36struct seg6_pernet_data {
37 struct mutex lock;
38 struct in6_addr __rcu *tun_src;
39#ifdef CONFIG_IPV6_SEG6_HMAC
40 struct rhashtable hmac_infos;
41#endif
42};
43
44static inline struct seg6_pernet_data *seg6_pernet(struct net *net)
45{
46#if IS_ENABLED(CONFIG_IPV6)
47 return net->ipv6.seg6_data;
48#else
49 return NULL;
50#endif
51}
52
53extern int seg6_init(void);
54extern void seg6_exit(void);
55#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
56extern int seg6_iptunnel_init(void);
57extern void seg6_iptunnel_exit(void);
58extern int seg6_local_init(void);
59extern void seg6_local_exit(void);
60#else
61static inline int seg6_iptunnel_init(void) { return 0; }
62static inline void seg6_iptunnel_exit(void) {}
63static inline int seg6_local_init(void) { return 0; }
64static inline void seg6_local_exit(void) {}
65#endif
66
67extern bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len, bool reduced);
68extern struct ipv6_sr_hdr *seg6_get_srh(struct sk_buff *skb, int flags);
69extern void seg6_icmp_srh(struct sk_buff *skb, struct inet6_skb_parm *opt);
70extern int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh,
71 int proto);
72extern int seg6_do_srh_inline(struct sk_buff *skb, struct ipv6_sr_hdr *osrh);
73extern int seg6_lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr,
74 u32 tbl_id);
75
76/* If the packet which invoked an ICMP error contains an SRH return
77 * the true destination address from within the SRH, otherwise use the
78 * destination address in the IP header.
79 */
80static inline const struct in6_addr *seg6_get_daddr(struct sk_buff *skb,
81 struct inet6_skb_parm *opt)
82{
83 struct ipv6_sr_hdr *srh;
84
85 if (opt->flags & IP6SKB_SEG6) {
86 srh = (struct ipv6_sr_hdr *)(skb->data + opt->srhoff);
87 return &srh->segments[0];
88 }
89
90 return NULL;
91}
92
93
94#endif