include/linux/genl_magic

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This source file includes following definitions.
ct_assert_unique_operations
ct_assert_unique_top_level_attributes
#ifndef GENL_MAGIC_STRUCT_H
#define GENL_MAGIC_STRUCT_H

#ifndef GENL_MAGIC_FAMILY
# error "you need to define GENL_MAGIC_FAMILY before inclusion"
#endif

#ifndef GENL_MAGIC_VERSION
# error "you need to define GENL_MAGIC_VERSION before inclusion"
#endif

#ifndef GENL_MAGIC_INCLUDE_FILE
# error "you need to define GENL_MAGIC_INCLUDE_FILE before inclusion"
#endif

#include <linux/genetlink.h>
#include <linux/types.h>

#define CONCAT__(a,b)   a ## b
#define CONCAT_(a,b)    CONCAT__(a,b)

extern int CONCAT_(GENL_MAGIC_FAMILY, _genl_register)(void);
extern void CONCAT_(GENL_MAGIC_FAMILY, _genl_unregister)(void);

/*
 * Extension of genl attribute validation policies                      {{{2
 */

/*
 * @DRBD_GENLA_F_MANDATORY: By default, netlink ignores attributes it does not
 * know about.  This flag can be set in nlattr->nla_type to indicate that this
 * attribute must not be ignored.
 *
 * We check and remove this flag in drbd_nla_check_mandatory() before
 * validating the attribute types and lengths via nla_parse_nested().
 */
#define DRBD_GENLA_F_MANDATORY (1 << 14)

/*
 * Flags specific to drbd and not visible at the netlink layer, used in
 * <struct>_from_attrs and <struct>_to_skb:
 *
 * @DRBD_F_REQUIRED: Attribute is required; a request without this attribute is
 * invalid.
 *
 * @DRBD_F_SENSITIVE: Attribute includes sensitive information and must not be
 * included in unpriviledged get requests or broadcasts.
 *
 * @DRBD_F_INVARIANT: Attribute is set when an object is initially created, but
 * cannot subsequently be changed.
 */
#define DRBD_F_REQUIRED (1 << 0)
#define DRBD_F_SENSITIVE (1 << 1)
#define DRBD_F_INVARIANT (1 << 2)

#define __nla_type(x)   ((__u16)((x) & NLA_TYPE_MASK & ~DRBD_GENLA_F_MANDATORY))

/*                                                                      }}}1
 * MAGIC
 * multi-include macro expansion magic starts here
 */

/* MAGIC helpers                                                        {{{2 */

/* possible field types */
#define __flg_field(attr_nr, attr_flag, name) \
        __field(attr_nr, attr_flag, name, NLA_U8, char, \
                        nla_get_u8, nla_put_u8, false)
#define __u8_field(attr_nr, attr_flag, name)    \
        __field(attr_nr, attr_flag, name, NLA_U8, unsigned char, \
                        nla_get_u8, nla_put_u8, false)
#define __u16_field(attr_nr, attr_flag, name)   \
        __field(attr_nr, attr_flag, name, NLA_U16, __u16, \
                        nla_get_u16, nla_put_u16, false)
#define __u32_field(attr_nr, attr_flag, name)   \
        __field(attr_nr, attr_flag, name, NLA_U32, __u32, \
                        nla_get_u32, nla_put_u32, false)
#define __s32_field(attr_nr, attr_flag, name)   \
        __field(attr_nr, attr_flag, name, NLA_U32, __s32, \
                        nla_get_u32, nla_put_u32, true)
#define __u64_field(attr_nr, attr_flag, name)   \
        __field(attr_nr, attr_flag, name, NLA_U64, __u64, \
                        nla_get_u64, nla_put_u64, false)
#define __str_field(attr_nr, attr_flag, name, maxlen) \
        __array(attr_nr, attr_flag, name, NLA_NUL_STRING, char, maxlen, \
                        nla_strlcpy, nla_put, false)
#define __bin_field(attr_nr, attr_flag, name, maxlen) \
        __array(attr_nr, attr_flag, name, NLA_BINARY, char, maxlen, \
                        nla_memcpy, nla_put, false)

/* fields with default values */
#define __flg_field_def(attr_nr, attr_flag, name, default) \
        __flg_field(attr_nr, attr_flag, name)
#define __u32_field_def(attr_nr, attr_flag, name, default) \
        __u32_field(attr_nr, attr_flag, name)
#define __s32_field_def(attr_nr, attr_flag, name, default) \
        __s32_field(attr_nr, attr_flag, name)
#define __str_field_def(attr_nr, attr_flag, name, maxlen) \
        __str_field(attr_nr, attr_flag, name, maxlen)

#define GENL_op_init(args...)   args
#define GENL_doit(handler)              \
        .doit = handler,                \
        .flags = GENL_ADMIN_PERM,
#define GENL_dumpit(handler)            \
        .dumpit = handler,              \
        .flags = GENL_ADMIN_PERM,

/*                                                                      }}}1
 * Magic: define the enum symbols for genl_ops
 * Magic: define the enum symbols for top level attributes
 * Magic: define the enum symbols for nested attributes
 *                                                                      {{{2
 */

#undef GENL_struct
#define GENL_struct(tag_name, tag_number, s_name, s_fields)

#undef GENL_mc_group
#define GENL_mc_group(group)

#undef GENL_notification
#define GENL_notification(op_name, op_num, mcast_group, tla_list)       \
        op_name = op_num,

#undef GENL_op
#define GENL_op(op_name, op_num, handler, tla_list)                     \
        op_name = op_num,

enum {
#include GENL_MAGIC_INCLUDE_FILE
};

#undef GENL_notification
#define GENL_notification(op_name, op_num, mcast_group, tla_list)

#undef GENL_op
#define GENL_op(op_name, op_num, handler, attr_list)

#undef GENL_struct
#define GENL_struct(tag_name, tag_number, s_name, s_fields) \
                tag_name = tag_number,

enum {
#include GENL_MAGIC_INCLUDE_FILE
};

#undef GENL_struct
#define GENL_struct(tag_name, tag_number, s_name, s_fields)     \
enum {                                                          \
        s_fields                                                \
};

#undef __field
#define __field(attr_nr, attr_flag, name, nla_type, type,       \
                __get, __put, __is_signed)                      \
        T_ ## name = (__u16)(attr_nr | ((attr_flag) & DRBD_GENLA_F_MANDATORY)),

#undef __array
#define __array(attr_nr, attr_flag, name, nla_type, type,       \
                maxlen, __get, __put, __is_signed)              \
        T_ ## name = (__u16)(attr_nr | ((attr_flag) & DRBD_GENLA_F_MANDATORY)),

#include GENL_MAGIC_INCLUDE_FILE

/*                                                                      }}}1
 * Magic: compile time assert unique numbers for operations
 * Magic: -"- unique numbers for top level attributes
 * Magic: -"- unique numbers for nested attributes
 *                                                                      {{{2
 */

#undef GENL_struct
#define GENL_struct(tag_name, tag_number, s_name, s_fields)

#undef GENL_op
#define GENL_op(op_name, op_num, handler, attr_list)    \
        case op_name:

#undef GENL_notification
#define GENL_notification(op_name, op_num, mcast_group, tla_list)       \
        case op_name:

static inline void ct_assert_unique_operations(void)
{
        switch (0) {
#include GENL_MAGIC_INCLUDE_FILE
                ;
        }
}

#undef GENL_op
#define GENL_op(op_name, op_num, handler, attr_list)

#undef GENL_notification
#define GENL_notification(op_name, op_num, mcast_group, tla_list)

#undef GENL_struct
#define GENL_struct(tag_name, tag_number, s_name, s_fields)             \
                case tag_number:

static inline void ct_assert_unique_top_level_attributes(void)
{
        switch (0) {
#include GENL_MAGIC_INCLUDE_FILE
                ;
        }
}

#undef GENL_struct
#define GENL_struct(tag_name, tag_number, s_name, s_fields)             \
static inline void ct_assert_unique_ ## s_name ## _attributes(void)     \
{                                                                       \
        switch (0) {                                                    \
                s_fields                                                \
                        ;                                               \
        }                                                               \
}

#undef __field
#define __field(attr_nr, attr_flag, name, nla_type, type, __get, __put, \
                __is_signed)                                            \
        case attr_nr:

#undef __array
#define __array(attr_nr, attr_flag, name, nla_type, type, maxlen,       \
                __get, __put, __is_signed)                              \
        case attr_nr:

#include GENL_MAGIC_INCLUDE_FILE

/*                                                                      }}}1
 * Magic: declare structs
 * struct <name> {
 *      fields
 * };
 *                                                                      {{{2
 */

#undef GENL_struct
#define GENL_struct(tag_name, tag_number, s_name, s_fields)             \
struct s_name { s_fields };

#undef __field
#define __field(attr_nr, attr_flag, name, nla_type, type, __get, __put, \
                __is_signed)                                            \
        type name;

#undef __array
#define __array(attr_nr, attr_flag, name, nla_type, type, maxlen,       \
                __get, __put, __is_signed)                              \
        type name[maxlen];      \
        __u32 name ## _len;

#include GENL_MAGIC_INCLUDE_FILE

#undef GENL_struct
#define GENL_struct(tag_name, tag_number, s_name, s_fields)             \
enum {                                                                  \
        s_fields                                                        \
};

#undef __field
#define __field(attr_nr, attr_flag, name, nla_type, type, __get, __put, \
                is_signed)                                              \
        F_ ## name ## _IS_SIGNED = is_signed,

#undef __array
#define __array(attr_nr, attr_flag, name, nla_type, type, maxlen,       \
                __get, __put, is_signed)                                \
        F_ ## name ## _IS_SIGNED = is_signed,

#include GENL_MAGIC_INCLUDE_FILE

/* }}}1 */
#endif /* GENL_MAGIC_STRUCT_H */
/* vim: set foldmethod=marker nofoldenable : */
/* [<][>][^][v][top][bottom][index][help] */
root/include/linux/genl_magic_struct.h

INCLUDED FROM

DEFINITIONS
