1 files changed, 277 insertions, 0 deletions

diff --git a/include/linux/genl_magic_struct.h b/include/linux/genl_magic_struct.h
new file mode 100644
index 000000000000..eecd19b37001
--- /dev/null
+++ b/include/linux/genl_magic_struct.h
@@ -0,0 +1,277 @@
+#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 : */