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286 lines
7.7 KiB
286 lines
7.7 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef GENL_MAGIC_STRUCT_H |
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#define GENL_MAGIC_STRUCT_H |
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#ifndef GENL_MAGIC_FAMILY |
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# error "you need to define GENL_MAGIC_FAMILY before inclusion" |
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#endif |
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#ifndef GENL_MAGIC_VERSION |
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# error "you need to define GENL_MAGIC_VERSION before inclusion" |
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#endif |
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#ifndef GENL_MAGIC_INCLUDE_FILE |
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# error "you need to define GENL_MAGIC_INCLUDE_FILE before inclusion" |
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#endif |
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#include <linux/genetlink.h> |
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#include <linux/types.h> |
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#define CONCAT__(a,b) a ## b |
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#define CONCAT_(a,b) CONCAT__(a,b) |
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extern int CONCAT_(GENL_MAGIC_FAMILY, _genl_register)(void); |
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extern void CONCAT_(GENL_MAGIC_FAMILY, _genl_unregister)(void); |
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/* |
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* Extension of genl attribute validation policies {{{2 |
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*/ |
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/* |
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* @DRBD_GENLA_F_MANDATORY: By default, netlink ignores attributes it does not |
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* know about. This flag can be set in nlattr->nla_type to indicate that this |
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* attribute must not be ignored. |
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* |
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* We check and remove this flag in drbd_nla_check_mandatory() before |
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* validating the attribute types and lengths via nla_parse_nested(). |
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*/ |
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#define DRBD_GENLA_F_MANDATORY (1 << 14) |
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/* |
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* Flags specific to drbd and not visible at the netlink layer, used in |
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* <struct>_from_attrs and <struct>_to_skb: |
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* |
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* @DRBD_F_REQUIRED: Attribute is required; a request without this attribute is |
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* invalid. |
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* |
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* @DRBD_F_SENSITIVE: Attribute includes sensitive information and must not be |
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* included in unpriviledged get requests or broadcasts. |
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* |
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* @DRBD_F_INVARIANT: Attribute is set when an object is initially created, but |
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* cannot subsequently be changed. |
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*/ |
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#define DRBD_F_REQUIRED (1 << 0) |
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#define DRBD_F_SENSITIVE (1 << 1) |
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#define DRBD_F_INVARIANT (1 << 2) |
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#define __nla_type(x) ((__u16)((x) & NLA_TYPE_MASK & ~DRBD_GENLA_F_MANDATORY)) |
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/* }}}1 |
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* MAGIC |
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* multi-include macro expansion magic starts here |
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*/ |
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/* MAGIC helpers {{{2 */ |
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static inline int nla_put_u64_0pad(struct sk_buff *skb, int attrtype, u64 value) |
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{ |
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return nla_put_64bit(skb, attrtype, sizeof(u64), &value, 0); |
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} |
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/* possible field types */ |
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#define __flg_field(attr_nr, attr_flag, name) \ |
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__field(attr_nr, attr_flag, name, NLA_U8, char, \ |
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nla_get_u8, nla_put_u8, false) |
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#define __u8_field(attr_nr, attr_flag, name) \ |
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__field(attr_nr, attr_flag, name, NLA_U8, unsigned char, \ |
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nla_get_u8, nla_put_u8, false) |
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#define __u16_field(attr_nr, attr_flag, name) \ |
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__field(attr_nr, attr_flag, name, NLA_U16, __u16, \ |
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nla_get_u16, nla_put_u16, false) |
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#define __u32_field(attr_nr, attr_flag, name) \ |
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__field(attr_nr, attr_flag, name, NLA_U32, __u32, \ |
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nla_get_u32, nla_put_u32, false) |
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#define __s32_field(attr_nr, attr_flag, name) \ |
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__field(attr_nr, attr_flag, name, NLA_U32, __s32, \ |
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nla_get_u32, nla_put_u32, true) |
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#define __u64_field(attr_nr, attr_flag, name) \ |
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__field(attr_nr, attr_flag, name, NLA_U64, __u64, \ |
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nla_get_u64, nla_put_u64_0pad, false) |
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#define __str_field(attr_nr, attr_flag, name, maxlen) \ |
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__array(attr_nr, attr_flag, name, NLA_NUL_STRING, char, maxlen, \ |
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nla_strscpy, nla_put, false) |
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#define __bin_field(attr_nr, attr_flag, name, maxlen) \ |
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__array(attr_nr, attr_flag, name, NLA_BINARY, char, maxlen, \ |
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nla_memcpy, nla_put, false) |
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/* fields with default values */ |
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#define __flg_field_def(attr_nr, attr_flag, name, default) \ |
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__flg_field(attr_nr, attr_flag, name) |
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#define __u32_field_def(attr_nr, attr_flag, name, default) \ |
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__u32_field(attr_nr, attr_flag, name) |
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#define __s32_field_def(attr_nr, attr_flag, name, default) \ |
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__s32_field(attr_nr, attr_flag, name) |
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#define __str_field_def(attr_nr, attr_flag, name, maxlen) \ |
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__str_field(attr_nr, attr_flag, name, maxlen) |
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#define GENL_op_init(args...) args |
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#define GENL_doit(handler) \ |
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.doit = handler, \ |
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.flags = GENL_ADMIN_PERM, |
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#define GENL_dumpit(handler) \ |
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.dumpit = handler, \ |
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.flags = GENL_ADMIN_PERM, |
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/* }}}1 |
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* Magic: define the enum symbols for genl_ops |
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* Magic: define the enum symbols for top level attributes |
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* Magic: define the enum symbols for nested attributes |
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* {{{2 |
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*/ |
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#undef GENL_struct |
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#define GENL_struct(tag_name, tag_number, s_name, s_fields) |
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#undef GENL_mc_group |
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#define GENL_mc_group(group) |
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#undef GENL_notification |
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#define GENL_notification(op_name, op_num, mcast_group, tla_list) \ |
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op_name = op_num, |
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#undef GENL_op |
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#define GENL_op(op_name, op_num, handler, tla_list) \ |
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op_name = op_num, |
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enum { |
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#include GENL_MAGIC_INCLUDE_FILE |
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}; |
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#undef GENL_notification |
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#define GENL_notification(op_name, op_num, mcast_group, tla_list) |
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#undef GENL_op |
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#define GENL_op(op_name, op_num, handler, attr_list) |
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#undef GENL_struct |
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#define GENL_struct(tag_name, tag_number, s_name, s_fields) \ |
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tag_name = tag_number, |
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enum { |
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#include GENL_MAGIC_INCLUDE_FILE |
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}; |
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#undef GENL_struct |
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#define GENL_struct(tag_name, tag_number, s_name, s_fields) \ |
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enum { \ |
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s_fields \ |
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}; |
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#undef __field |
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#define __field(attr_nr, attr_flag, name, nla_type, type, \ |
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__get, __put, __is_signed) \ |
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T_ ## name = (__u16)(attr_nr | ((attr_flag) & DRBD_GENLA_F_MANDATORY)), |
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#undef __array |
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#define __array(attr_nr, attr_flag, name, nla_type, type, \ |
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maxlen, __get, __put, __is_signed) \ |
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T_ ## name = (__u16)(attr_nr | ((attr_flag) & DRBD_GENLA_F_MANDATORY)), |
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#include GENL_MAGIC_INCLUDE_FILE |
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/* }}}1 |
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* Magic: compile time assert unique numbers for operations |
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* Magic: -"- unique numbers for top level attributes |
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* Magic: -"- unique numbers for nested attributes |
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* {{{2 |
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*/ |
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#undef GENL_struct |
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#define GENL_struct(tag_name, tag_number, s_name, s_fields) |
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#undef GENL_op |
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#define GENL_op(op_name, op_num, handler, attr_list) \ |
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case op_name: |
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#undef GENL_notification |
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#define GENL_notification(op_name, op_num, mcast_group, tla_list) \ |
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case op_name: |
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static inline void ct_assert_unique_operations(void) |
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{ |
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switch (0) { |
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#include GENL_MAGIC_INCLUDE_FILE |
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case 0: |
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; |
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} |
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} |
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#undef GENL_op |
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#define GENL_op(op_name, op_num, handler, attr_list) |
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#undef GENL_notification |
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#define GENL_notification(op_name, op_num, mcast_group, tla_list) |
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#undef GENL_struct |
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#define GENL_struct(tag_name, tag_number, s_name, s_fields) \ |
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case tag_number: |
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static inline void ct_assert_unique_top_level_attributes(void) |
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{ |
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switch (0) { |
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#include GENL_MAGIC_INCLUDE_FILE |
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case 0: |
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; |
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} |
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} |
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#undef GENL_struct |
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#define GENL_struct(tag_name, tag_number, s_name, s_fields) \ |
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static inline void ct_assert_unique_ ## s_name ## _attributes(void) \ |
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{ \ |
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switch (0) { \ |
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s_fields \ |
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case 0: \ |
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; \ |
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} \ |
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} |
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#undef __field |
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#define __field(attr_nr, attr_flag, name, nla_type, type, __get, __put, \ |
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__is_signed) \ |
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case attr_nr: |
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#undef __array |
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#define __array(attr_nr, attr_flag, name, nla_type, type, maxlen, \ |
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__get, __put, __is_signed) \ |
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case attr_nr: |
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#include GENL_MAGIC_INCLUDE_FILE |
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/* }}}1 |
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* Magic: declare structs |
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* struct <name> { |
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* fields |
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* }; |
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* {{{2 |
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*/ |
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#undef GENL_struct |
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#define GENL_struct(tag_name, tag_number, s_name, s_fields) \ |
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struct s_name { s_fields }; |
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#undef __field |
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#define __field(attr_nr, attr_flag, name, nla_type, type, __get, __put, \ |
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__is_signed) \ |
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type name; |
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#undef __array |
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#define __array(attr_nr, attr_flag, name, nla_type, type, maxlen, \ |
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__get, __put, __is_signed) \ |
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type name[maxlen]; \ |
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__u32 name ## _len; |
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#include GENL_MAGIC_INCLUDE_FILE |
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#undef GENL_struct |
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#define GENL_struct(tag_name, tag_number, s_name, s_fields) \ |
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enum { \ |
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s_fields \ |
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}; |
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#undef __field |
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#define __field(attr_nr, attr_flag, name, nla_type, type, __get, __put, \ |
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is_signed) \ |
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F_ ## name ## _IS_SIGNED = is_signed, |
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#undef __array |
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#define __array(attr_nr, attr_flag, name, nla_type, type, maxlen, \ |
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__get, __put, is_signed) \ |
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F_ ## name ## _IS_SIGNED = is_signed, |
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#include GENL_MAGIC_INCLUDE_FILE |
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/* }}}1 */ |
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#endif /* GENL_MAGIC_STRUCT_H */ |
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/* vim: set foldmethod=marker nofoldenable : */
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