include/uapi/linux/rpl.h

   1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
   2 /*
   3  *  IPv6 RPL-SR implementation
   4  *
   5  *  Author:
   6  *  (C) 2020 Alexander Aring <alex.aring@gmail.com>
   7  */
   8
   9 #ifndef _UAPI_LINUX_RPL_H
  10 #define _UAPI_LINUX_RPL_H
  11
  12 #include <asm/byteorder.h>
  13 #include <linux/types.h>
  14 #include <linux/in6.h>
  15
  16 /*
  17  * RPL SR Header
  18  */
  19 struct ipv6_rpl_sr_hdr {
  20         __u8    nexthdr;
  21         __u8    hdrlen;
  22         __u8    type;
  23         __u8    segments_left;
  24 #if defined(__LITTLE_ENDIAN_BITFIELD)
  25         __u32   cmpre:4,
  26                 cmpri:4,
  27                 reserved:4,
  28                 pad:4,
  29                 reserved1:16;
  30 #elif defined(__BIG_ENDIAN_BITFIELD)
  31         __u32   cmpri:4,
  32                 cmpre:4,
  33                 pad:4,
  34                 reserved:20;
  35 #else
  36 #error  "Please fix <asm/byteorder.h>"
  37 #endif
  38
  39         union {
  40                 __DECLARE_FLEX_ARRAY(struct in6_addr, addr);
  41                 __DECLARE_FLEX_ARRAY(__u8, data);
  42         } segments;
  43 } __attribute__((packed));
  44
  45 #define rpl_segaddr     segments.addr
  46 #define rpl_segdata     segments.data
  47
  48 #endif