linux/include/linux/genl_magic_struct.h
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   1#ifndef GENL_MAGIC_STRUCT_H
   2#define GENL_MAGIC_STRUCT_H
   3
   4#ifndef GENL_MAGIC_FAMILY
   5# error "you need to define GENL_MAGIC_FAMILY before inclusion"
   6#endif
   7
   8#ifndef GENL_MAGIC_VERSION
   9# error "you need to define GENL_MAGIC_VERSION before inclusion"
  10#endif
  11
  12#ifndef GENL_MAGIC_INCLUDE_FILE
  13# error "you need to define GENL_MAGIC_INCLUDE_FILE before inclusion"
  14#endif
  15
  16#include <linux/genetlink.h>
  17#include <linux/types.h>
  18
  19#define CONCAT__(a,b)   a ## b
  20#define CONCAT_(a,b)    CONCAT__(a,b)
  21
  22extern int CONCAT_(GENL_MAGIC_FAMILY, _genl_register)(void);
  23extern void CONCAT_(GENL_MAGIC_FAMILY, _genl_unregister)(void);
  24
  25/*
  26 * Extension of genl attribute validation policies                      {{{2
  27 */
  28
  29/*
  30 * @DRBD_GENLA_F_MANDATORY: By default, netlink ignores attributes it does not
  31 * know about.  This flag can be set in nlattr->nla_type to indicate that this
  32 * attribute must not be ignored.
  33 *
  34 * We check and remove this flag in drbd_nla_check_mandatory() before
  35 * validating the attribute types and lengths via nla_parse_nested().
  36 */
  37#define DRBD_GENLA_F_MANDATORY (1 << 14)
  38
  39/*
  40 * Flags specific to drbd and not visible at the netlink layer, used in
  41 * <struct>_from_attrs and <struct>_to_skb:
  42 *
  43 * @DRBD_F_REQUIRED: Attribute is required; a request without this attribute is
  44 * invalid.
  45 *
  46 * @DRBD_F_SENSITIVE: Attribute includes sensitive information and must not be
  47 * included in unpriviledged get requests or broadcasts.
  48 *
  49 * @DRBD_F_INVARIANT: Attribute is set when an object is initially created, but
  50 * cannot subsequently be changed.
  51 */
  52#define DRBD_F_REQUIRED (1 << 0)
  53#define DRBD_F_SENSITIVE (1 << 1)
  54#define DRBD_F_INVARIANT (1 << 2)
  55
  56#define __nla_type(x)   ((__u16)((x) & NLA_TYPE_MASK & ~DRBD_GENLA_F_MANDATORY))
  57
  58/*                                                                      }}}1
  59 * MAGIC
  60 * multi-include macro expansion magic starts here
  61 */
  62
  63/* MAGIC helpers                                                        {{{2 */
  64
  65/* possible field types */
  66#define __flg_field(attr_nr, attr_flag, name) \
  67        __field(attr_nr, attr_flag, name, NLA_U8, char, \
  68                        nla_get_u8, nla_put_u8, false)
  69#define __u8_field(attr_nr, attr_flag, name)    \
  70        __field(attr_nr, attr_flag, name, NLA_U8, unsigned char, \
  71                        nla_get_u8, nla_put_u8, false)
  72#define __u16_field(attr_nr, attr_flag, name)   \
  73        __field(attr_nr, attr_flag, name, NLA_U16, __u16, \
  74                        nla_get_u16, nla_put_u16, false)
  75#define __u32_field(attr_nr, attr_flag, name)   \
  76        __field(attr_nr, attr_flag, name, NLA_U32, __u32, \
  77                        nla_get_u32, nla_put_u32, false)
  78#define __s32_field(attr_nr, attr_flag, name)   \
  79        __field(attr_nr, attr_flag, name, NLA_U32, __s32, \
  80                        nla_get_u32, nla_put_u32, true)
  81#define __u64_field(attr_nr, attr_flag, name)   \
  82        __field(attr_nr, attr_flag, name, NLA_U64, __u64, \
  83                        nla_get_u64, nla_put_u64, false)
  84#define __str_field(attr_nr, attr_flag, name, maxlen) \
  85        __array(attr_nr, attr_flag, name, NLA_NUL_STRING, char, maxlen, \
  86                        nla_strlcpy, nla_put, false)
  87#define __bin_field(attr_nr, attr_flag, name, maxlen) \
  88        __array(attr_nr, attr_flag, name, NLA_BINARY, char, maxlen, \
  89                        nla_memcpy, nla_put, false)
  90
  91/* fields with default values */
  92#define __flg_field_def(attr_nr, attr_flag, name, default) \
  93        __flg_field(attr_nr, attr_flag, name)
  94#define __u32_field_def(attr_nr, attr_flag, name, default) \
  95        __u32_field(attr_nr, attr_flag, name)
  96#define __s32_field_def(attr_nr, attr_flag, name, default) \
  97        __s32_field(attr_nr, attr_flag, name)
  98#define __str_field_def(attr_nr, attr_flag, name, maxlen) \
  99        __str_field(attr_nr, attr_flag, name, maxlen)
 100
 101#define GENL_op_init(args...)   args
 102#define GENL_doit(handler)              \
 103        .doit = handler,                \
 104        .flags = GENL_ADMIN_PERM,
 105#define GENL_dumpit(handler)            \
 106        .dumpit = handler,              \
 107        .flags = GENL_ADMIN_PERM,
 108
 109/*                                                                      }}}1
 110 * Magic: define the enum symbols for genl_ops
 111 * Magic: define the enum symbols for top level attributes
 112 * Magic: define the enum symbols for nested attributes
 113 *                                                                      {{{2
 114 */
 115
 116#undef GENL_struct
 117#define GENL_struct(tag_name, tag_number, s_name, s_fields)
 118
 119#undef GENL_mc_group
 120#define GENL_mc_group(group)
 121
 122#undef GENL_notification
 123#define GENL_notification(op_name, op_num, mcast_group, tla_list)       \
 124        op_name = op_num,
 125
 126#undef GENL_op
 127#define GENL_op(op_name, op_num, handler, tla_list)                     \
 128        op_name = op_num,
 129
 130enum {
 131#include GENL_MAGIC_INCLUDE_FILE
 132};
 133
 134#undef GENL_notification
 135#define GENL_notification(op_name, op_num, mcast_group, tla_list)
 136
 137#undef GENL_op
 138#define GENL_op(op_name, op_num, handler, attr_list)
 139
 140#undef GENL_struct
 141#define GENL_struct(tag_name, tag_number, s_name, s_fields) \
 142                tag_name = tag_number,
 143
 144enum {
 145#include GENL_MAGIC_INCLUDE_FILE
 146};
 147
 148#undef GENL_struct
 149#define GENL_struct(tag_name, tag_number, s_name, s_fields)     \
 150enum {                                                          \
 151        s_fields                                                \
 152};
 153
 154#undef __field
 155#define __field(attr_nr, attr_flag, name, nla_type, type,       \
 156                __get, __put, __is_signed)                      \
 157        T_ ## name = (__u16)(attr_nr | ((attr_flag) & DRBD_GENLA_F_MANDATORY)),
 158
 159#undef __array
 160#define __array(attr_nr, attr_flag, name, nla_type, type,       \
 161                maxlen, __get, __put, __is_signed)              \
 162        T_ ## name = (__u16)(attr_nr | ((attr_flag) & DRBD_GENLA_F_MANDATORY)),
 163
 164#include GENL_MAGIC_INCLUDE_FILE
 165
 166/*                                                                      }}}1
 167 * Magic: compile time assert unique numbers for operations
 168 * Magic: -"- unique numbers for top level attributes
 169 * Magic: -"- unique numbers for nested attributes
 170 *                                                                      {{{2
 171 */
 172
 173#undef GENL_struct
 174#define GENL_struct(tag_name, tag_number, s_name, s_fields)
 175
 176#undef GENL_op
 177#define GENL_op(op_name, op_num, handler, attr_list)    \
 178        case op_name:
 179
 180#undef GENL_notification
 181#define GENL_notification(op_name, op_num, mcast_group, tla_list)       \
 182        case op_name:
 183
 184static inline void ct_assert_unique_operations(void)
 185{
 186        switch (0) {
 187#include GENL_MAGIC_INCLUDE_FILE
 188                ;
 189        }
 190}
 191
 192#undef GENL_op
 193#define GENL_op(op_name, op_num, handler, attr_list)
 194
 195#undef GENL_notification
 196#define GENL_notification(op_name, op_num, mcast_group, tla_list)
 197
 198#undef GENL_struct
 199#define GENL_struct(tag_name, tag_number, s_name, s_fields)             \
 200                case tag_number:
 201
 202static inline void ct_assert_unique_top_level_attributes(void)
 203{
 204        switch (0) {
 205#include GENL_MAGIC_INCLUDE_FILE
 206                ;
 207        }
 208}
 209
 210#undef GENL_struct
 211#define GENL_struct(tag_name, tag_number, s_name, s_fields)             \
 212static inline void ct_assert_unique_ ## s_name ## _attributes(void)     \
 213{                                                                       \
 214        switch (0) {                                                    \
 215                s_fields                                                \
 216                        ;                                               \
 217        }                                                               \
 218}
 219
 220#undef __field
 221#define __field(attr_nr, attr_flag, name, nla_type, type, __get, __put, \
 222                __is_signed)                                            \
 223        case attr_nr:
 224
 225#undef __array
 226#define __array(attr_nr, attr_flag, name, nla_type, type, maxlen,       \
 227                __get, __put, __is_signed)                              \
 228        case attr_nr:
 229
 230#include GENL_MAGIC_INCLUDE_FILE
 231
 232/*                                                                      }}}1
 233 * Magic: declare structs
 234 * struct <name> {
 235 *      fields
 236 * };
 237 *                                                                      {{{2
 238 */
 239
 240#undef GENL_struct
 241#define GENL_struct(tag_name, tag_number, s_name, s_fields)             \
 242struct s_name { s_fields };
 243
 244#undef __field
 245#define __field(attr_nr, attr_flag, name, nla_type, type, __get, __put, \
 246                __is_signed)                                            \
 247        type name;
 248
 249#undef __array
 250#define __array(attr_nr, attr_flag, name, nla_type, type, maxlen,       \
 251                __get, __put, __is_signed)                              \
 252        type name[maxlen];      \
 253        __u32 name ## _len;
 254
 255#include GENL_MAGIC_INCLUDE_FILE
 256
 257#undef GENL_struct
 258#define GENL_struct(tag_name, tag_number, s_name, s_fields)             \
 259enum {                                                                  \
 260        s_fields                                                        \
 261};
 262
 263#undef __field
 264#define __field(attr_nr, attr_flag, name, nla_type, type, __get, __put, \
 265                is_signed)                                              \
 266        F_ ## name ## _IS_SIGNED = is_signed,
 267
 268#undef __array
 269#define __array(attr_nr, attr_flag, name, nla_type, type, maxlen,       \
 270                __get, __put, is_signed)                                \
 271        F_ ## name ## _IS_SIGNED = is_signed,
 272
 273#include GENL_MAGIC_INCLUDE_FILE
 274
 275/* }}}1 */
 276#endif /* GENL_MAGIC_STRUCT_H */
 277/* vim: set foldmethod=marker nofoldenable : */
 278
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