include/linux/seg6.h

   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 _LINUX_SEG6_H
  16 #define _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