#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
*/
/**
* GENLA_F_FLAGS - policy type flags to ease compatible ABI evolvement
*
* @GENLA_F_REQUIRED: attribute has to be present, or message is considered invalid.
* Adding new REQUIRED attributes breaks ABI compatibility, so don't do that.
*
* @GENLA_F_MANDATORY: if present, receiver _must_ understand it.
* Without this, unknown attributes (> maxtype) are _silently_ ignored
* by validate_nla().
*
* To be used for API extensions, so older kernel can reject requests for not
* yet implemented features, if newer userland tries to use them even though
* the genl_family version clearly indicates they are not available.
*
* @GENLA_F_MAY_IGNORE: To clearly document the fact, for good measure.
* To be used for API extensions for things that have sane defaults,
* so newer userland can still talk to older kernel, knowing it will
* silently ignore these attributes if not yet known.
*
* NOTE: These flags overload
* NLA_F_NESTED (1 << 15)
* NLA_F_NET_BYTEORDER (1 << 14)
* from linux/netlink.h, which are not useful for validate_nla():
* NET_BYTEORDER is not used anywhere, and NESTED would be specified by setting
* .type = NLA_NESTED in the appropriate policy.
*
* See also: nla_type()
*/
enum {
GENLA_F_MAY_IGNORE = 0,
GENLA_F_MANDATORY = 1 << 14,
GENLA_F_REQUIRED = 1 << 15,
/* Below will not be present in the __u16 .nla_type, but can be
* triggered on in <struct>_to_skb resp. <struct>_from_attrs */
/* To exclude "sensitive" information from broadcasts, or on
* unpriviledged get requests. This is useful because genetlink
* multicast groups can be listened in on by anyone. */
GENLA_F_SENSITIVE = 1 << 16,
/* INVARIAN options cannot be changed at runtime.
* Useful to share an attribute policy and struct definition,
* between some "create" and "change" commands,
* but disallow certain fields to be changed online.
*/
GENLA_F_INVARIANT = 1 << 17,
};
#define __nla_type(x) ((__u16)((__u16)(x) & (__u16)NLA_TYPE_MASK))
/* }}}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_FLAG, char, \
nla_get_flag, __nla_put_flag)
#define __u8_field(attr_nr, attr_flag, name) \
__field(attr_nr, attr_flag, name, NLA_U8, unsigned char, \
nla_get_u8, NLA_PUT_U8)
#define __u16_field(attr_nr, attr_flag, name) \
__field(attr_nr, attr_flag, name, NLA_U16, __u16, \
nla_get_u16, NLA_PUT_U16)
#define __u32_field(attr_nr, attr_flag, name) \
__field(attr_nr, attr_flag, name, NLA_U32, __u32, \
nla_get_u32, NLA_PUT_U32)
#define __u64_field(attr_nr, attr_flag, name) \
__field(attr_nr, attr_flag, name, NLA_U64, __u64, \
nla_get_u64, NLA_PUT_U64)
#define __str_field(attr_nr, attr_flag, name, maxlen) \
__array(attr_nr, attr_flag, name, NLA_NUL_STRING, char, maxlen, \
nla_strlcpy, NLA_PUT)
#define __bin_field(attr_nr, attr_flag, name, maxlen) \
__array(attr_nr, attr_flag, name, NLA_BINARY, char, maxlen, \
nla_memcpy, NLA_PUT)
#define __nla_put_flag(skb, attrtype, value) \
do { \
if (value) \
NLA_PUT_FLAG(skb, attrtype); \
} while (0)
#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) \
T_ ## name = (__u16)(attr_nr | attr_flag),
#undef __array
#define __array(attr_nr, attr_flag, name, nla_type, type, maxlen, __get, __put) \
T_ ## name = (__u16)(attr_nr | attr_flag),
#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) \
case attr_nr:
#undef __array
#define __array(attr_nr, attr_flag, name, nla_type, type, maxlen, __get, __put) \
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) \
type name;
#undef __array
#define __array(attr_nr, attr_flag, name, nla_type, type, maxlen, __get, __put) \
type name[maxlen]; \
__u32 name ## _len;
#include GENL_MAGIC_INCLUDE_FILE
/* }}}1 */
#endif /* GENL_MAGIC_STRUCT_H */
/* vim: set foldmethod=marker nofoldenable : */
