include: add kernel header for seg6/seg6local

The linux kernel is adding support for seg6/seg6local
lwtunnel type to support SRv6 feature.
This commit update our includes to reflect new types
and structs we should be listening for from the kernel

Signed-off-by: Hiroki Shirokura <slank.dev@gmail.com>

1 files changed, 55 insertions, 0 deletions

diff --git a/include/linux/seg6.h b/include/linux/seg6.h
new file mode 100644
index 0000000000..329163e4a0
--- /dev/null
+++ b/include/linux/seg6.h
@@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
+/*
+ *  SR-IPv6 implementation
+ *
+ *  Author:
+ *  David Lebrun <david.lebrun@uclouvain.be>
+ *
+ *
+ *  This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _LINUX_SEG6_H
+#define _LINUX_SEG6_H
+
+#include <linux/types.h>
+#include <linux/in6.h>		/* For struct in6_addr. */
+
+/*
+ * SRH
+ */
+struct ipv6_sr_hdr {
+	__u8	nexthdr;
+	__u8	hdrlen;
+	__u8	type;
+	__u8	segments_left;
+	__u8	first_segment; /* Represents the last_entry field of SRH */
+	__u8	flags;
+	__u16	tag;
+
+	struct in6_addr segments[0];
+};
+
+#define SR6_FLAG1_PROTECTED	(1 << 6)
+#define SR6_FLAG1_OAM		(1 << 5)
+#define SR6_FLAG1_ALERT		(1 << 4)
+#define SR6_FLAG1_HMAC		(1 << 3)
+
+#define SR6_TLV_INGRESS		1
+#define SR6_TLV_EGRESS		2
+#define SR6_TLV_OPAQUE		3
+#define SR6_TLV_PADDING		4
+#define SR6_TLV_HMAC		5
+
+#define sr_has_hmac(srh) ((srh)->flags & SR6_FLAG1_HMAC)
+
+struct sr6_tlv {
+	__u8 type;
+	__u8 len;
+	__u8 data[0];
+};
+
+#endif