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 */
24 struct 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[0];
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
49 struct sr6_tlv {
50 __u8 type;
51 __u8 len;
52 __u8 data[0];
53 };
54
55 #endif