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fbf5df34a4
Using definitions in kernel policies is awkward right now. On one hand we want defines for max values and such. On the other we don't have a way of adding kernel-only defines. Adding unnecessary defines to uAPI is a bad idea, we won't be able to delete them. And when it comes to policy user space should just query it via the policy dump, not use hard coded defines. Add a "scope" property to definitions, which will let us tell the codegen that a definition is for kernel use only. Support following values: - uapi: render into the uAPI header (default, today's behavior) - kernel: render to kernel header only - user: same as kernel but for the user-side generated header Definitions may have a header property (definition is "external", provided by existing header). Extend the scope to headers, too. If definition has both scope and header properties we will only generate the includes in the right scope. Signed-off-by: Jakub Kicinski <kuba@kernel.org> Link: https://patch.msgid.link/20260510192904.3987113-8-kuba@kernel.org Signed-off-by: Paolo Abeni <pabeni@redhat.com>
536 lines
19 KiB
YAML
536 lines
19 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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$defs:
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name:
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type: string
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pattern: ^[0-9a-z-]+$
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name-cap:
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type: string
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pattern: ^[0-9a-zA-Z-]+$
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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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len-or-limit:
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# literal int, const name, or limit based on fixed-width type
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# e.g. u8-min, u16-max, etc.
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type: [ string, integer ]
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pattern: ^[0-9A-Za-z_-]+$
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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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$ref: '#/$defs/name'
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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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scope:
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description: |
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Visibility of this definition. "uapi" (default) renders into
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the uAPI header, "kernel" renders into the kernel-side
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generated header, "user" renders into the user-side
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generated header. When combined with `header:`, the
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definition is not rendered, and the named header is
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included only by code matching the scope.
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enum: [ uapi, kernel, user ]
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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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$ref: '#/$defs/name'
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value:
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type: integer
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doc:
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type: string
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render-max:
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description: Render the max members for this enum.
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type: boolean
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# Start genetlink-c
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enum-name:
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description: Name for enum, if empty no name will be used.
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type: [ string, "null" ]
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name-prefix:
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description: For enum the prefix of the values, optional.
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type: string
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# End genetlink-c
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# Start genetlink-legacy
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members:
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description: List of struct members. Only scalars and strings members allowed.
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type: array
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items:
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type: object
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required: [ name, type ]
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additionalProperties: False
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properties:
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name:
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$ref: '#/$defs/name-cap'
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type:
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description: |
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The netlink attribute type. Members of type 'binary' or 'pad'
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must also have the 'len' property set.
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enum: [ u8, u16, u32, u64, s8, s16, s32, s64, string, binary, pad ]
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len:
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$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, ipv4-or-v6, uuid ]
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struct:
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description: Name of the nested struct type.
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type: string
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if:
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properties:
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type:
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const: pad
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then:
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required: [ len ]
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if:
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properties:
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type:
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const: binary
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then:
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oneOf:
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- required: [ len ]
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- required: [ struct ]
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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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$ref: '#/$defs/name'
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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: |
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Name for the enum type of the attribute, if empty no name will be used.
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type: [ string, "null" ]
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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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header:
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description: For C-compatible languages, header which already defines this attribute set.
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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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$ref: '#/$defs/name'
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type: &attr-type
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description: The netlink attribute type
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enum: [ unused, pad, flag, binary, bitfield32,
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uint, sint, u8, u16, u32, u64, s8, s16, s32, s64,
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string, nest, indexed-array, nest-type-value,
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sub-message ]
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doc:
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description: Documentation of the attribute.
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type: string
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value:
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description: Value for the enum item representing this attribute in the uAPI.
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$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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$ref: '#/$defs/len-or-limit'
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max:
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description: Max value for an integer attribute.
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$ref: '#/$defs/len-or-limit'
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min-len:
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description: Min length for a binary attribute.
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$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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unterminated-ok:
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description: |
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For string attributes, do not check whether attribute
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contains the terminating null character.
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type: boolean
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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: |
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Name for the enum type with commands, if empty no name will be used.
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type: [ string, "null" ]
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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: |
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Name for the enum type with commands, if empty no name will be used.
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type: [ string, "null" ]
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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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$ref: '#/$defs/name'
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doc:
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description: Documentation for the command.
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type: string
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value:
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description: Value for the enum in the uAPI.
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$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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