include/uapi/linux/seg6_iptunnel.h

   1 /*
   2  *  SR-IPv6 implementation
   3  *
   4  *  Author:
   5  *  David Lebrun <david.lebrun@uclouvain.be>
   6  *
   7  *
   8  *  This program is free software; you can redistribute it and/or
   9  *      modify it under the terms of the GNU General Public License
  10  *      as published by the Free Software Foundation; either version
  11  *      2 of the License, or (at your option) any later version.
  12  */
  13
  14 #ifndef _UAPI_LINUX_SEG6_IPTUNNEL_H
  15 #define _UAPI_LINUX_SEG6_IPTUNNEL_H
  16
  17 #include <linux/seg6.h>         /* For struct ipv6_sr_hdr. */
  18
  19 enum {
  20         SEG6_IPTUNNEL_UNSPEC,
  21         SEG6_IPTUNNEL_SRH,
  22         __SEG6_IPTUNNEL_MAX,
  23 };
  24 #define SEG6_IPTUNNEL_MAX (__SEG6_IPTUNNEL_MAX - 1)
  25
  26 struct seg6_iptunnel_encap {
  27         int mode;
  28         struct ipv6_sr_hdr srh[0];
  29 };
  30
  31 #define SEG6_IPTUN_ENCAP_SIZE(x) ((sizeof(*x)) + (((x)->srh->hdrlen + 1) << 3))
  32
  33 enum {
  34         SEG6_IPTUN_MODE_INLINE,
  35         SEG6_IPTUN_MODE_ENCAP,
  36         SEG6_IPTUN_MODE_L2ENCAP,
  37 };
  38
  39 #ifdef __KERNEL__
  40
  41 static inline size_t seg6_lwt_headroom(struct seg6_iptunnel_encap *tuninfo)
  42 {
  43         int head = 0;
  44
  45         switch (tuninfo->mode) {
  46         case SEG6_IPTUN_MODE_INLINE:
  47                 break;
  48         case SEG6_IPTUN_MODE_ENCAP:
  49                 head = sizeof(struct ipv6hdr);
  50                 break;
  51         case SEG6_IPTUN_MODE_L2ENCAP:
  52                 return 0;
  53         }
  54
  55         return ((tuninfo->srh->hdrlen + 1) << 3) + head;
  56 }
  57
  58 #endif
  59
  60 #endif