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 | |
17 | static 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(buff: (char *)diff, len: sizeof(diff), sum: ~skb->csum); |
23 | } |
24 | |
25 | static 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(buff: (char *)diff, len: sizeof(diff), sum: ~skb->csum); |
34 | } |
35 | |
36 | struct 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 | |
44 | static 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 | |
53 | extern int seg6_init(void); |
54 | extern void seg6_exit(void); |
55 | extern int seg6_iptunnel_init(void); |
56 | extern void seg6_iptunnel_exit(void); |
57 | extern int seg6_local_init(void); |
58 | extern void seg6_local_exit(void); |
59 | |
60 | extern bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len, bool reduced); |
61 | extern struct ipv6_sr_hdr *seg6_get_srh(struct sk_buff *skb, int flags); |
62 | extern void seg6_icmp_srh(struct sk_buff *skb, struct inet6_skb_parm *opt); |
63 | extern int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh, |
64 | int proto); |
65 | extern int seg6_do_srh_inline(struct sk_buff *skb, struct ipv6_sr_hdr *osrh); |
66 | extern int seg6_lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr, |
67 | u32 tbl_id); |
68 | |
69 | /* If the packet which invoked an ICMP error contains an SRH return |
70 | * the true destination address from within the SRH, otherwise use the |
71 | * destination address in the IP header. |
72 | */ |
73 | static inline const struct in6_addr *seg6_get_daddr(struct sk_buff *skb, |
74 | struct inet6_skb_parm *opt) |
75 | { |
76 | struct ipv6_sr_hdr *srh; |
77 | |
78 | if (opt->flags & IP6SKB_SEG6) { |
79 | srh = (struct ipv6_sr_hdr *)(skb->data + opt->srhoff); |
80 | return &srh->segments[0]; |
81 | } |
82 | |
83 | return NULL; |
84 | } |
85 | |
86 | |
87 | #endif |
88 | |