include/linux/genl_magic_struct.h

   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
  22 extern int CONCAT_(GENL_MAGIC_FAMILY, _genl_register)(void);
  23 extern 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 static inline int nla_put_u64_0pad(struct sk_buff *skb, int attrtype, u64 value)
  66 {
  67         return nla_put_64bit(skb, attrtype, sizeof(u64), &value, 0);
  68 }
  69
  70 /* possible field types */
  71 #define __flg_field(attr_nr, attr_flag, name) \
  72         __field(attr_nr, attr_flag, name, NLA_U8, char, \
  73                         nla_get_u8, nla_put_u8, false)
  74 #define __u8_field(attr_nr, attr_flag, name)    \
  75         __field(attr_nr, attr_flag, name, NLA_U8, unsigned char, \
  76                         nla_get_u8, nla_put_u8, false)
  77 #define __u16_field(attr_nr, attr_flag, name)   \
  78         __field(attr_nr, attr_flag, name, NLA_U16, __u16, \
  79                         nla_get_u16, nla_put_u16, false)
  80 #define __u32_field(attr_nr, attr_flag, name)   \
  81         __field(attr_nr, attr_flag, name, NLA_U32, __u32, \
  82                         nla_get_u32, nla_put_u32, false)
  83 #define __s32_field(attr_nr, attr_flag, name)   \
  84         __field(attr_nr, attr_flag, name, NLA_U32, __s32, \
  85                         nla_get_u32, nla_put_u32, true)
  86 #define __u64_field(attr_nr, attr_flag, name)   \
  87         __field(attr_nr, attr_flag, name, NLA_U64, __u64, \
  88                         nla_get_u64, nla_put_u64_0pad, false)
  89 #define __str_field(attr_nr, attr_flag, name, maxlen) \
  90         __array(attr_nr, attr_flag, name, NLA_NUL_STRING, char, maxlen, \
  91                         nla_strlcpy, nla_put, false)
  92 #define __bin_field(attr_nr, attr_flag, name, maxlen) \
  93         __array(attr_nr, attr_flag, name, NLA_BINARY, char, maxlen, \
  94                         nla_memcpy, nla_put, false)
  95
  96 /* fields with default values */
  97 #define __flg_field_def(attr_nr, attr_flag, name, default) \
  98         __flg_field(attr_nr, attr_flag, name)
  99 #define __u32_field_def(attr_nr, attr_flag, name, default) \
 100         __u32_field(attr_nr, attr_flag, name)
 101 #define __s32_field_def(attr_nr, attr_flag, name, default) \
 102         __s32_field(attr_nr, attr_flag, name)
 103 #define __str_field_def(attr_nr, attr_flag, name, maxlen) \
 104         __str_field(attr_nr, attr_flag, name, maxlen)
 105
 106 #define GENL_op_init(args...)   args
 107 #define GENL_doit(handler)              \
 108         .doit = handler,                \
 109         .flags = GENL_ADMIN_PERM,
 110 #define GENL_dumpit(handler)            \
 111         .dumpit = handler,              \
 112         .flags = GENL_ADMIN_PERM,
 113
 114 /*                                                                      }}}1
 115  * Magic: define the enum symbols for genl_ops
 116  * Magic: define the enum symbols for top level attributes
 117  * Magic: define the enum symbols for nested attributes
 118  *                                                                      {{{2
 119  */
 120
 121 #undef GENL_struct
 122 #define GENL_struct(tag_name, tag_number, s_name, s_fields)
 123
 124 #undef GENL_mc_group
 125 #define GENL_mc_group(group)
 126
 127 #undef GENL_notification
 128 #define GENL_notification(op_name, op_num, mcast_group, tla_list)       \
 129         op_name = op_num,
 130
 131 #undef GENL_op
 132 #define GENL_op(op_name, op_num, handler, tla_list)                     \
 133         op_name = op_num,
 134
 135 enum {
 136 #include GENL_MAGIC_INCLUDE_FILE
 137 };
 138
 139 #undef GENL_notification
 140 #define GENL_notification(op_name, op_num, mcast_group, tla_list)
 141
 142 #undef GENL_op
 143 #define GENL_op(op_name, op_num, handler, attr_list)
 144
 145 #undef GENL_struct
 146 #define GENL_struct(tag_name, tag_number, s_name, s_fields) \
 147                 tag_name = tag_number,
 148
 149 enum {
 150 #include GENL_MAGIC_INCLUDE_FILE
 151 };
 152
 153 #undef GENL_struct
 154 #define GENL_struct(tag_name, tag_number, s_name, s_fields)     \
 155 enum {                                                          \
 156         s_fields                                                \
 157 };
 158
 159 #undef __field
 160 #define __field(attr_nr, attr_flag, name, nla_type, type,       \
 161                 __get, __put, __is_signed)                      \
 162         T_ ## name = (__u16)(attr_nr | ((attr_flag) & DRBD_GENLA_F_MANDATORY)),
 163
 164 #undef __array
 165 #define __array(attr_nr, attr_flag, name, nla_type, type,       \
 166                 maxlen, __get, __put, __is_signed)              \
 167         T_ ## name = (__u16)(attr_nr | ((attr_flag) & DRBD_GENLA_F_MANDATORY)),
 168
 169 #include GENL_MAGIC_INCLUDE_FILE
 170
 171 /*                                                                      }}}1
 172  * Magic: compile time assert unique numbers for operations
 173  * Magic: -"- unique numbers for top level attributes
 174  * Magic: -"- unique numbers for nested attributes
 175  *                                                                      {{{2
 176  */
 177
 178 #undef GENL_struct
 179 #define GENL_struct(tag_name, tag_number, s_name, s_fields)
 180
 181 #undef GENL_op
 182 #define GENL_op(op_name, op_num, handler, attr_list)    \
 183         case op_name:
 184
 185 #undef GENL_notification
 186 #define GENL_notification(op_name, op_num, mcast_group, tla_list)       \
 187         case op_name:
 188
 189 static inline void ct_assert_unique_operations(void)
 190 {
 191         switch (0) {
 192 #include GENL_MAGIC_INCLUDE_FILE
 193                 ;
 194         }
 195 }
 196
 197 #undef GENL_op
 198 #define GENL_op(op_name, op_num, handler, attr_list)
 199
 200 #undef GENL_notification
 201 #define GENL_notification(op_name, op_num, mcast_group, tla_list)
 202
 203 #undef GENL_struct
 204 #define GENL_struct(tag_name, tag_number, s_name, s_fields)             \
 205                 case tag_number:
 206
 207 static inline void ct_assert_unique_top_level_attributes(void)
 208 {
 209         switch (0) {
 210 #include GENL_MAGIC_INCLUDE_FILE
 211                 ;
 212         }
 213 }
 214
 215 #undef GENL_struct
 216 #define GENL_struct(tag_name, tag_number, s_name, s_fields)             \
 217 static inline void ct_assert_unique_ ## s_name ## _attributes(void)     \
 218 {                                                                       \
 219         switch (0) {                                                    \
 220                 s_fields                                                \
 221                         ;                                               \
 222         }                                                               \
 223 }
 224
 225 #undef __field
 226 #define __field(attr_nr, attr_flag, name, nla_type, type, __get, __put, \
 227                 __is_signed)                                            \
 228         case attr_nr:
 229
 230 #undef __array
 231 #define __array(attr_nr, attr_flag, name, nla_type, type, maxlen,       \
 232                 __get, __put, __is_signed)                              \
 233         case attr_nr:
 234
 235 #include GENL_MAGIC_INCLUDE_FILE
 236
 237 /*                                                                      }}}1
 238  * Magic: declare structs
 239  * struct <name> {
 240  *      fields
 241  * };
 242  *                                                                      {{{2
 243  */
 244
 245 #undef GENL_struct
 246 #define GENL_struct(tag_name, tag_number, s_name, s_fields)             \
 247 struct s_name { s_fields };
 248
 249 #undef __field
 250 #define __field(attr_nr, attr_flag, name, nla_type, type, __get, __put, \
 251                 __is_signed)                                            \
 252         type name;
 253
 254 #undef __array
 255 #define __array(attr_nr, attr_flag, name, nla_type, type, maxlen,       \
 256                 __get, __put, __is_signed)                              \
 257         type name[maxlen];      \
 258         __u32 name ## _len;
 259
 260 #include GENL_MAGIC_INCLUDE_FILE
 261
 262 #undef GENL_struct
 263 #define GENL_struct(tag_name, tag_number, s_name, s_fields)             \
 264 enum {                                                                  \
 265         s_fields                                                        \
 266 };
 267
 268 #undef __field
 269 #define __field(attr_nr, attr_flag, name, nla_type, type, __get, __put, \
 270                 is_signed)                                              \
 271         F_ ## name ## _IS_SIGNED = is_signed,
 272
 273 #undef __array
 274 #define __array(attr_nr, attr_flag, name, nla_type, type, maxlen,       \
 275                 __get, __put, is_signed)                                \
 276         F_ ## name ## _IS_SIGNED = is_signed,
 277
 278 #include GENL_MAGIC_INCLUDE_FILE
 279
 280 /* }}}1 */
 281 #endif /* GENL_MAGIC_STRUCT_H */
 282 /* vim: set foldmethod=marker nofoldenable : */