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       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 _LINUX_RPL_H
      10  #define _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