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doc/netlink: Document the netlink-raw schema extensions

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Add a doc page for netlink-raw that describes the schema attributes
needed for netlink-raw.

Signed-off-by: Donald Hunter <donald.hunter@gmail.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://lore.kernel.org/r/20230825122756.7603-5-donald.hunter@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Donald Hunter 2023-08-25 13:27:47 +01:00 committed by Jakub Kicinski
parent 294f37fc87
commit 2db8abf0b4
2 changed files with 59 additions and 0 deletions
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1
Documentation/userspace-api/netlink/index.rst
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@ -14,5 +14,6 @@ Netlink documentation for users.
specs
c-code-gen
genetlink-legacy
netlink-raw
See also :ref:`Documentation/core-api/netlink.rst <kernel_netlink>`.

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Documentation/userspace-api/netlink/netlink-raw.rst Normal file
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@ -0,0 +1,58 @@
.. SPDX-License-Identifier: BSD-3-Clause
======================================================
Netlink specification support for raw Netlink families
======================================================
This document describes the additional properties required by raw Netlink
families such as ``NETLINK_ROUTE`` which use the ``netlink-raw`` protocol
specification.
Specification
=============
The netlink-raw schema extends the :doc:`genetlink-legacy <genetlink-legacy>`
schema with properties that are needed to specify the protocol numbers and
multicast IDs used by raw netlink families. See :ref:`classic_netlink` for more
information.
Globals
-------
protonum
~~~~~~~~
The ``protonum`` property is used to specify the protocol number to use when
opening a netlink socket.
.. code-block:: yaml
# SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)
name: rt-addr
protocol: netlink-raw
protonum: 0 # part of the NETLINK_ROUTE protocol
Multicast group properties
--------------------------
value
~~~~~
The ``value`` property is used to specify the group ID to use for multicast
group registration.
.. code-block:: yaml
mcast-groups:
list:
-
name: rtnlgrp-ipv4-ifaddr
value: 5
-
name: rtnlgrp-ipv6-ifaddr
value: 9
-
name: rtnlgrp-mctp-ifaddr
value: 34