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de2d98743b
Add a 'sub-message' attribute type with a selector that supports
polymorphic attribute formats for raw netlink families like tc.
A sub-message attribute uses the value of another attribute as a
selector key to choose the right sub-message format. For example if the
following attribute has already been decoded:
{ "kind": "gre" }
and we encounter the following attribute spec:
-
name: data
type: sub-message
sub-message: linkinfo-data-msg
selector: kind
Then we look for a sub-message definition called 'linkinfo-data-msg' and
use the value of the 'kind' attribute i.e. 'gre' as the key to choose
the correct format for the sub-message:
sub-messages:
name: linkinfo-data-msg
formats:
-
value: bridge
attribute-set: linkinfo-bridge-attrs
-
value: gre
attribute-set: linkinfo-gre-attrs
-
value: geneve
attribute-set: linkinfo-geneve-attrs
This would decode the attribute value as a sub-message with the
attribute-set called 'linkinfo-gre-attrs' as the attribute space.
A sub-message can have an optional 'fixed-header' followed by zero or
more attributes from an attribute-set. For example the following
'tc-options-msg' sub-message defines message formats that use a mixture
of fixed-header, attribute-set or both together:
sub-messages:
-
name: tc-options-msg
formats:
-
value: bfifo
fixed-header: tc-fifo-qopt
-
value: cake
attribute-set: tc-cake-attrs
-
value: netem
fixed-header: tc-netem-qopt
attribute-set: tc-netem-attrs
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Donald Hunter <donald.hunter@gmail.com>
Link: https://lore.kernel.org/r/20231215093720.18774-3-donald.hunter@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
492 lines
17 KiB
YAML
492 lines
17 KiB
YAML
# SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)
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%YAML 1.2
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---
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$id: http://kernel.org/schemas/netlink/netlink-raw.yaml#
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$schema: https://json-schema.org/draft-07/schema
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# Common defines
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$defs:
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uint:
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type: integer
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minimum: 0
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len-or-define:
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type: [ string, integer ]
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pattern: ^[0-9A-Za-z_]+( - 1)?$
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minimum: 0
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# Schema for specs
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title: Protocol
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description: Specification of a raw netlink protocol
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type: object
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required: [ name, doc, attribute-sets, operations ]
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additionalProperties: False
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properties:
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name:
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description: Name of the netlink family.
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type: string
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doc:
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type: string
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protocol:
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description: Schema compatibility level.
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enum: [ netlink-raw ] # Trim
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# Start netlink-raw
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protonum:
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description: Protocol number to use for netlink-raw
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type: integer
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# End netlink-raw
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uapi-header:
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description: Path to the uAPI header, default is linux/${family-name}.h
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type: string
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# Start genetlink-c
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c-family-name:
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description: Name of the define for the family name.
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type: string
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c-version-name:
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description: Name of the define for the version of the family.
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type: string
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max-by-define:
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description: Makes the number of attributes and commands be specified by a define, not an enum value.
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type: boolean
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cmd-max-name:
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description: Name of the define for the last operation in the list.
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type: string
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cmd-cnt-name:
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description: The explicit name for constant holding the count of operations (last operation + 1).
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type: string
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# End genetlink-c
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# Start genetlink-legacy
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kernel-policy:
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description: |
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Defines if the input policy in the kernel is global, per-operation, or split per operation type.
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Default is split.
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enum: [ split, per-op, global ]
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# End genetlink-legacy
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definitions:
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description: List of type and constant definitions (enums, flags, defines).
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type: array
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items:
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type: object
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required: [ type, name ]
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additionalProperties: False
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properties:
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name:
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type: string
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header:
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description: For C-compatible languages, header which already defines this value.
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type: string
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type:
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enum: [ const, enum, flags, struct ] # Trim
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doc:
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type: string
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# For const
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value:
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description: For const - the value.
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type: [ string, integer ]
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# For enum and flags
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value-start:
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description: For enum or flags the literal initializer for the first value.
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type: [ string, integer ]
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entries:
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description: For enum or flags array of values.
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type: array
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items:
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oneOf:
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- type: string
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- type: object
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required: [ name ]
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additionalProperties: False
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properties:
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name:
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type: string
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value:
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type: integer
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doc:
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type: string
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render-max:
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description: Render the max members for this enum.
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type: boolean
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# Start genetlink-c
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enum-name:
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description: Name for enum, if empty no name will be used.
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type: [ string, "null" ]
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name-prefix:
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description: For enum the prefix of the values, optional.
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type: string
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# End genetlink-c
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# Start genetlink-legacy
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members:
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description: List of struct members. Only scalars and strings members allowed.
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type: array
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items:
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type: object
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required: [ name, type ]
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additionalProperties: False
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properties:
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name:
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type: string
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type:
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description: |
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The netlink attribute type. Members of type 'binary' or 'pad'
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must also have the 'len' property set.
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enum: [ u8, u16, u32, u64, s8, s16, s32, s64, string, binary, pad ]
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len:
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$ref: '#/$defs/len-or-define'
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byte-order:
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enum: [ little-endian, big-endian ]
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doc:
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description: Documentation for the struct member attribute.
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type: string
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enum:
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description: Name of the enum type used for the attribute.
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type: string
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enum-as-flags:
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description: |
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Treat the enum as flags. In most cases enum is either used as flags or as values.
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Sometimes, however, both forms are necessary, in which case header contains the enum
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form while specific attributes may request to convert the values into a bitfield.
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type: boolean
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display-hint: &display-hint
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description: |
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Optional format indicator that is intended only for choosing
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the right formatting mechanism when displaying values of this
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type.
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enum: [ hex, mac, fddi, ipv4, ipv6, uuid ]
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if:
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properties:
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type:
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oneOf:
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- const: binary
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- const: pad
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then:
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required: [ len ]
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# End genetlink-legacy
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attribute-sets:
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description: Definition of attribute spaces for this family.
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type: array
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items:
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description: Definition of a single attribute space.
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type: object
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required: [ name, attributes ]
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additionalProperties: False
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properties:
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name:
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description: |
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Name used when referring to this space in other definitions, not used outside of the spec.
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type: string
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name-prefix:
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description: |
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Prefix for the C enum name of the attributes. Default family[name]-set[name]-a-
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type: string
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enum-name:
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description: Name for the enum type of the attribute.
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type: string
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doc:
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description: Documentation of the space.
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type: string
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subset-of:
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description: |
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Name of another space which this is a logical part of. Sub-spaces can be used to define
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a limited group of attributes which are used in a nest.
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type: string
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# Start genetlink-c
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attr-cnt-name:
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description: The explicit name for constant holding the count of attributes (last attr + 1).
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type: string
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attr-max-name:
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description: The explicit name for last member of attribute enum.
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type: string
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# End genetlink-c
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attributes:
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description: List of attributes in the space.
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type: array
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items:
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type: object
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required: [ name ]
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additionalProperties: False
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properties:
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name:
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type: string
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type: &attr-type
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description: The netlink attribute type
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enum: [ unused, pad, flag, binary, bitfield32,
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u8, u16, u32, u64, s8, s16, s32, s64,
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string, nest, array-nest, nest-type-value,
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sub-message ]
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doc:
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description: Documentation of the attribute.
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type: string
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value:
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description: Value for the enum item representing this attribute in the uAPI.
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$ref: '#/$defs/uint'
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type-value:
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description: Name of the value extracted from the type of a nest-type-value attribute.
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type: array
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items:
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type: string
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byte-order:
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enum: [ little-endian, big-endian ]
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multi-attr:
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type: boolean
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nested-attributes:
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description: Name of the space (sub-space) used inside the attribute.
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type: string
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enum:
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description: Name of the enum type used for the attribute.
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type: string
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enum-as-flags:
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description: |
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Treat the enum as flags. In most cases enum is either used as flags or as values.
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Sometimes, however, both forms are necessary, in which case header contains the enum
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form while specific attributes may request to convert the values into a bitfield.
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type: boolean
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checks:
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description: Kernel input validation.
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type: object
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additionalProperties: False
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properties:
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flags-mask:
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description: Name of the flags constant on which to base mask (unsigned scalar types only).
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type: string
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min:
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description: Min value for an integer attribute.
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type: integer
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min-len:
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description: Min length for a binary attribute.
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$ref: '#/$defs/len-or-define'
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max-len:
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description: Max length for a string or a binary attribute.
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$ref: '#/$defs/len-or-define'
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exact-len:
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description: Exact length for a string or a binary attribute.
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$ref: '#/$defs/len-or-define'
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sub-type: *attr-type
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display-hint: *display-hint
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# Start genetlink-c
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name-prefix:
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type: string
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# End genetlink-c
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# Start genetlink-legacy
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struct:
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description: Name of the struct type used for the attribute.
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type: string
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# End genetlink-legacy
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# Start netlink-raw
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sub-message:
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description: |
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Name of the sub-message definition to use for the attribute.
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type: string
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selector:
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description: |
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Name of the attribute to use for dynamic selection of sub-message
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format specifier.
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type: string
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# End netlink-raw
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# Make sure name-prefix does not appear in subsets (subsets inherit naming)
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dependencies:
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name-prefix:
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not:
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required: [ subset-of ]
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subset-of:
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not:
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required: [ name-prefix ]
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# type property is only required if not in subset definition
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if:
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properties:
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subset-of:
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not:
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type: string
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then:
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properties:
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attributes:
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items:
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required: [ type ]
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# Start netlink-raw
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sub-messages:
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description: Definition of sub message attributes
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type: array
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items:
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type: object
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additionalProperties: False
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required: [ name, formats ]
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properties:
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name:
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description: Name of the sub-message definition
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type: string
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formats:
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description: Dynamically selected format specifiers
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type: array
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items:
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type: object
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additionalProperties: False
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required: [ value ]
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properties:
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value:
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description: |
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Value to match for dynamic selection of sub-message format
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specifier.
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type: string
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fixed-header:
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description: |
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Name of the struct definition to use as the fixed header
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for the sub message.
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type: string
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attribute-set:
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description: |
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Name of the attribute space from which to resolve attributes
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in the sub message.
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type: string
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# End netlink-raw
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operations:
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description: Operations supported by the protocol.
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type: object
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required: [ list ]
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additionalProperties: False
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properties:
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enum-model:
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description: |
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The model of assigning values to the operations.
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"unified" is the recommended model where all message types belong
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to a single enum.
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"directional" has the messages sent to the kernel and from the kernel
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enumerated separately.
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enum: [ unified, directional ] # Trim
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name-prefix:
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description: |
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Prefix for the C enum name of the command. The name is formed by concatenating
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the prefix with the upper case name of the command, with dashes replaced by underscores.
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type: string
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enum-name:
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description: Name for the enum type with commands.
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type: string
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async-prefix:
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description: Same as name-prefix but used to render notifications and events to separate enum.
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type: string
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async-enum:
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description: Name for the enum type with notifications/events.
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type: string
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# Start genetlink-legacy
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fixed-header: &fixed-header
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description: |
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Name of the structure defining the optional fixed-length protocol
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header. This header is placed in a message after the netlink and
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genetlink headers and before any attributes.
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type: string
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# End genetlink-legacy
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list:
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description: List of commands
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type: array
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items:
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type: object
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additionalProperties: False
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required: [ name, doc ]
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properties:
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name:
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description: Name of the operation, also defining its C enum value in uAPI.
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type: string
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doc:
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description: Documentation for the command.
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type: string
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value:
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description: Value for the enum in the uAPI.
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$ref: '#/$defs/uint'
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attribute-set:
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description: |
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Attribute space from which attributes directly in the requests and replies
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to this command are defined.
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type: string
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flags: &cmd_flags
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description: Command flags.
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type: array
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items:
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enum: [ admin-perm ]
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dont-validate:
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description: Kernel attribute validation flags.
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type: array
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items:
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enum: [ strict, dump ]
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# Start genetlink-legacy
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fixed-header: *fixed-header
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# End genetlink-legacy
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do: &subop-type
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description: Main command handler.
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type: object
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additionalProperties: False
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properties:
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request: &subop-attr-list
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description: Definition of the request message for a given command.
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type: object
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additionalProperties: False
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properties:
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attributes:
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description: |
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Names of attributes from the attribute-set (not full attribute
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definitions, just names).
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type: array
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items:
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type: string
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# Start genetlink-legacy
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value:
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description: |
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ID of this message if value for request and response differ,
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i.e. requests and responses have different message enums.
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$ref: '#/$defs/uint'
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# End genetlink-legacy
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reply: *subop-attr-list
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pre:
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description: Hook for a function to run before the main callback (pre_doit or start).
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type: string
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post:
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description: Hook for a function to run after the main callback (post_doit or done).
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type: string
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dump: *subop-type
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notify:
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description: Name of the command sharing the reply type with this notification.
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type: string
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event:
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type: object
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additionalProperties: False
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properties:
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attributes:
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description: Explicit list of the attributes for the notification.
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type: array
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items:
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type: string
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mcgrp:
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description: Name of the multicast group generating given notification.
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type: string
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mcast-groups:
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description: List of multicast groups.
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type: object
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required: [ list ]
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additionalProperties: False
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properties:
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list:
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description: List of groups.
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type: array
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items:
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type: object
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required: [ name ]
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additionalProperties: False
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properties:
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name:
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description: |
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The name for the group, used to form the define and the value of the define.
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type: string
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# Start genetlink-c
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c-define-name:
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description: Override for the name of the define in C uAPI.
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type: string
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# End genetlink-c
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flags: *cmd_flags
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# Start netlink-raw
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value:
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description: Value of the netlink multicast group in the uAPI.
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type: integer
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# End netlink-raw
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