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편집 파일: genl_magic_struct.h

/* SPDX-License-Identifier: GPL-2.0 */ #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/args.h> #include <linux/types.h> #include <net/genetlink.h> extern int CONCATENATE(GENL_MAGIC_FAMILY, _genl_register)(void); extern void CONCATENATE(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 */ static inline int nla_put_u64_0pad(struct sk_buff *skb, int attrtype, u64 value) { return nla_put_64bit(skb, attrtype, sizeof(u64), &value, 0); } /* 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_0pad, false) #define __str_field(attr_nr, attr_flag, name, maxlen) \ __array(attr_nr, attr_flag, name, NLA_NUL_STRING, char, maxlen, \ nla_strscpy, 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 case 0: ; } } #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 case 0: ; } } #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 \ case 0: \ ; \ } \ } #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 */