/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */

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/*

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* SR-IPv6 implementation

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*

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* Author:

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* David Lebrun <david.lebrun@uclouvain.be>

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*

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*

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* This program is free software; you can redistribute it and/or

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* modify it under the terms of the GNU General Public License

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* as published by the Free Software Foundation; either version

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* 2 of the License, or (at your option) any later version.

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*/

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#ifndef _LINUX_SEG6_H

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#define _LINUX_SEG6_H

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#include <linux/types.h>

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#include <linux/in6.h> /* For struct in6_addr. */

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/*

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* SRH

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*/

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struct ipv6_sr_hdr {

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__u8 nexthdr;

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__u8 hdrlen;

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__u8 type;

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__u8 segments_left;

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__u8 first_segment; /* Represents the last_entry field of SRH */

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__u8 flags;

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__u16 tag;

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struct in6_addr segments[0];

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};

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#define SR6_FLAG1_PROTECTED (1 << 6)

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#define SR6_FLAG1_OAM (1 << 5)

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#define SR6_FLAG1_ALERT (1 << 4)

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#define SR6_FLAG1_HMAC (1 << 3)

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#define SR6_TLV_INGRESS 1

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#define SR6_TLV_EGRESS 2

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#define SR6_TLV_OPAQUE 3

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#define SR6_TLV_PADDING 4

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#define SR6_TLV_HMAC 5

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#define sr_has_hmac(srh) ((srh)->flags & SR6_FLAG1_HMAC)

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struct sr6_tlv {

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__u8 type;

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__u8 len;

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__u8 data[0];

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};

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#endif

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