v4.19.13 snapshot.
diff --git a/include/linux/genl_magic_struct.h b/include/linux/genl_magic_struct.h
new file mode 100644
index 0000000..5972e49
--- /dev/null
+++ b/include/linux/genl_magic_struct.h
@@ -0,0 +1,283 @@
+/* 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/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 */
+
+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_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 : */