/* 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