1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2/*
3 *  SR-IPv6 implementation
4 *
5 *  Author:
6 *  David Lebrun <david.lebrun@uclouvain.be>
7 *
8 *
9 *  This program is free software; you can redistribute it and/or
10 *      modify it under the terms of the GNU General Public License
11 *      as published by the Free Software Foundation; either version
12 *      2 of the License, or (at your option) any later version.
13 */
14
15#ifndef _UAPI_LINUX_SEG6_H
16#define _UAPI_LINUX_SEG6_H
17
18#include <linux/types.h>
19#include <linux/in6.h>		/* For struct in6_addr. */
20
21/*
22 * SRH
23 */
24struct ipv6_sr_hdr {
25	__u8	nexthdr;
26	__u8	hdrlen;
27	__u8	type;
28	__u8	segments_left;
29	__u8	first_segment; /* Represents the last_entry field of SRH */
30	__u8	flags;
31	__u16	tag;
32
33	struct in6_addr segments[];
34};
35
36#define SR6_FLAG1_PROTECTED	(1 << 6)
37#define SR6_FLAG1_OAM		(1 << 5)
38#define SR6_FLAG1_ALERT		(1 << 4)
39#define SR6_FLAG1_HMAC		(1 << 3)
40
41#define SR6_TLV_INGRESS		1
42#define SR6_TLV_EGRESS		2
43#define SR6_TLV_OPAQUE		3
44#define SR6_TLV_PADDING		4
45#define SR6_TLV_HMAC		5
46
47#define sr_has_hmac(srh) ((srh)->flags & SR6_FLAG1_HMAC)
48
49struct sr6_tlv {
50	__u8 type;
51	__u8 len;
52	__u8 data[0];
53};
54
55#endif
56