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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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a5d8e1fb9d
Flags of type NLA_FLAG are either present or absent, but do not have a value by themselves. Use type NLA_U8 for our boolean flags instead, and use the value to determine if the flag should be on or off. On the drbdsetup command line, all those flags have an optional yes/no argument which defaults to yes. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
273 lines
7.6 KiB
C
273 lines
7.6 KiB
C
#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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* GENLA_F_FLAGS - policy type flags to ease compatible ABI evolvement
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*
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* @GENLA_F_REQUIRED: attribute has to be present, or message is considered invalid.
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* Adding new REQUIRED attributes breaks ABI compatibility, so don't do that.
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*
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* @GENLA_F_MANDATORY: if present, receiver _must_ understand it.
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* Without this, unknown attributes (> maxtype) are _silently_ ignored
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* by validate_nla().
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*
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* To be used for API extensions, so older kernel can reject requests for not
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* yet implemented features, if newer userland tries to use them even though
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* the genl_family version clearly indicates they are not available.
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*
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* @GENLA_F_MAY_IGNORE: To clearly document the fact, for good measure.
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* To be used for API extensions for things that have sane defaults,
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* so newer userland can still talk to older kernel, knowing it will
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* silently ignore these attributes if not yet known.
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*
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* NOTE: These flags overload
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* NLA_F_NESTED (1 << 15)
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* NLA_F_NET_BYTEORDER (1 << 14)
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* from linux/netlink.h, which are not useful for validate_nla():
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* NET_BYTEORDER is not used anywhere, and NESTED would be specified by setting
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* .type = NLA_NESTED in the appropriate policy.
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*
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* See also: nla_type()
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*/
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enum {
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GENLA_F_MAY_IGNORE = 0,
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GENLA_F_MANDATORY = 1 << 14,
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GENLA_F_REQUIRED = 1 << 15,
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/* Below will not be present in the __u16 .nla_type, but can be
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* triggered on in <struct>_to_skb resp. <struct>_from_attrs */
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/* To exclude "sensitive" information from broadcasts, or on
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* unpriviledged get requests. This is useful because genetlink
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* multicast groups can be listened in on by anyone. */
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GENLA_F_SENSITIVE = 1 << 16,
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/* INVARIAN options cannot be changed at runtime.
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* Useful to share an attribute policy and struct definition,
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* between some "create" and "change" commands,
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* but disallow certain fields to be changed online.
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*/
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GENLA_F_INVARIANT = 1 << 17,
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};
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#define __nla_type(x) ((__u16)((__u16)(x) & (__u16)NLA_TYPE_MASK))
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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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/* 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)
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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)
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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)
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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)
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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)
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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)
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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_strlcpy, NLA_PUT)
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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)
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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 __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, __get, __put) \
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T_ ## name = (__u16)(attr_nr | attr_flag),
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#undef __array
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#define __array(attr_nr, attr_flag, name, nla_type, type, maxlen, __get, __put) \
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T_ ## name = (__u16)(attr_nr | attr_flag),
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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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;
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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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;
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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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; \
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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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case attr_nr:
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#undef __array
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#define __array(attr_nr, attr_flag, name, nla_type, type, maxlen, __get, __put) \
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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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type name;
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#undef __array
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#define __array(attr_nr, attr_flag, name, nla_type, type, maxlen, __get, __put) \
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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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/* }}}1 */
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#endif /* GENL_MAGIC_STRUCT_H */
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/* vim: set foldmethod=marker nofoldenable : */
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