include/uapi/linux/ioam6.h

   1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
   2 /*
   3  *  IPv6 IOAM implementation
   4  *
   5  *  Author:
   6  *  Justin Iurman <[email protected]>
   7  */
   8
   9 #ifndef _UAPI_LINUX_IOAM6_H
  10 #define _UAPI_LINUX_IOAM6_H
  11
  12 #include <asm/byteorder.h>
  13 #include <linux/types.h>
  14
  15 #define IOAM6_U16_UNAVAILABLE U16_MAX
  16 #define IOAM6_U32_UNAVAILABLE U32_MAX
  17 #define IOAM6_U64_UNAVAILABLE U64_MAX
  18
  19 #define IOAM6_DEFAULT_ID (IOAM6_U32_UNAVAILABLE >> 8)
  20 #define IOAM6_DEFAULT_ID_WIDE (IOAM6_U64_UNAVAILABLE >> 8)
  21 #define IOAM6_DEFAULT_IF_ID IOAM6_U16_UNAVAILABLE
  22 #define IOAM6_DEFAULT_IF_ID_WIDE IOAM6_U32_UNAVAILABLE
  23
  24 /*
  25  * IPv6 IOAM Option Header
  26  */
  27 struct ioam6_hdr {
  28         __u8 opt_type;
  29         __u8 opt_len;
  30         __u8 :8;                                /* reserved */
  31 #define IOAM6_TYPE_PREALLOC 0
  32         __u8 type;
  33 } __attribute__((packed));
  34
  35 /*
  36  * IOAM Trace Header
  37  */
  38 struct ioam6_trace_hdr {
  39         __be16  namespace_id;
  40
  41 #if defined(__LITTLE_ENDIAN_BITFIELD)
  42
  43         __u8    :1,                             /* unused */
  44                 :1,                             /* unused */
  45                 overflow:1,
  46                 nodelen:5;
  47
  48         __u8    remlen:7,
  49                 :1;                             /* unused */
  50
  51         union {
  52                 __be32 type_be32;
  53
  54                 struct {
  55                         __u32   bit7:1,
  56                                 bit6:1,
  57                                 bit5:1,
  58                                 bit4:1,
  59                                 bit3:1,
  60                                 bit2:1,
  61                                 bit1:1,
  62                                 bit0:1,
  63                                 bit15:1,        /* unused */
  64                                 bit14:1,        /* unused */
  65                                 bit13:1,        /* unused */
  66                                 bit12:1,        /* unused */
  67                                 bit11:1,
  68                                 bit10:1,
  69                                 bit9:1,
  70                                 bit8:1,
  71                                 bit23:1,        /* reserved */
  72                                 bit22:1,
  73                                 bit21:1,        /* unused */
  74                                 bit20:1,        /* unused */
  75                                 bit19:1,        /* unused */
  76                                 bit18:1,        /* unused */
  77                                 bit17:1,        /* unused */
  78                                 bit16:1,        /* unused */
  79                                 :8;             /* reserved */
  80                 } type;
  81         };
  82
  83 #elif defined(__BIG_ENDIAN_BITFIELD)
  84
  85         __u8    nodelen:5,
  86                 overflow:1,
  87                 :1,                             /* unused */
  88                 :1;                             /* unused */
  89
  90         __u8    :1,                             /* unused */
  91                 remlen:7;
  92
  93         union {
  94                 __be32 type_be32;
  95
  96                 struct {
  97                         __u32   bit0:1,
  98                                 bit1:1,
  99                                 bit2:1,
 100                                 bit3:1,
 101                                 bit4:1,
 102                                 bit5:1,
 103                                 bit6:1,
 104                                 bit7:1,
 105                                 bit8:1,
 106                                 bit9:1,
 107                                 bit10:1,
 108                                 bit11:1,
 109                                 bit12:1,        /* unused */
 110                                 bit13:1,        /* unused */
 111                                 bit14:1,        /* unused */
 112                                 bit15:1,        /* unused */
 113                                 bit16:1,        /* unused */
 114                                 bit17:1,        /* unused */
 115                                 bit18:1,        /* unused */
 116                                 bit19:1,        /* unused */
 117                                 bit20:1,        /* unused */
 118                                 bit21:1,        /* unused */
 119                                 bit22:1,
 120                                 bit23:1,        /* reserved */
 121                                 :8;             /* reserved */
 122                 } type;
 123         };
 124
 125 #else
 126 #error "Please fix <asm/byteorder.h>"
 127 #endif
 128
 129 #define IOAM6_TRACE_DATA_SIZE_MAX 244
 130         __u8    data[0];
 131 } __attribute__((packed));
 132
 133 #endif /* _UAPI_LINUX_IOAM6_H */