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04b67d4925
Newer kernels export meta-information about the origin of an ifname. Respect this from the ifname rename logic. We do not rename any interfaces that was originally named by userspace, nor once which have already been renamed from userspace. Moreover, we optionally do not (the default) rename interfaces which the kernel claims to have named in a predictable way.
403 lines
23 KiB
XML
403 lines
23 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2014 Tom Gundersen
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="systemd.link">
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<refentryinfo>
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<title>systemd.link</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Tom</firstname>
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<surname>Gundersen</surname>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd.link</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd.link</refname>
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<refpurpose>Network device configuration</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename><replaceable>link</replaceable>.link</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>Network link configuration is performed by the <command>net_setup_link</command>
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udev builtin.</para>
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<para>The link files are read from the files located in the
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system network directory <filename>/usr/lib/systemd/network</filename>,
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the volatile runtime network directory <filename>/run/systemd/network</filename>,
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and the local administration network directory <filename>/etc/systemd/network</filename>.
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Link files must have the extension <filename>.link</filename>; other extensions are ignored.
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All link files are collectively sorted and processed in lexical order,
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regardless of the directories in which they live. However, files with
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identical filenames replace each other. Files in <filename>/etc</filename>
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have the highest priority, files in <filename>/run</filename> take precedence
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over files with the same name in <filename>/usr/lib</filename>. This can be
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used to override a system-supplied link file with a local file if needed;
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a symlink in <filename>/etc</filename> with the same name as a link file in
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<filename>/usr/lib</filename>, pointing to <filename>/dev/null</filename>,
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disables the link file entirely.</para>
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<para>The link file contains a <literal>[Match]</literal> section, which
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determines if a given link file may be applied to a given device; and a
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<literal>[Link]</literal> section specifying how the device should be
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configured. The first (in lexical order) of the link files that matches
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a given device is applied.</para>
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</refsect1>
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<refsect1>
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<title>[Match] Section Options</title>
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<para>A link file is said to match a device if each of the entries in the
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<literal>[Match]</literal> section matches, or if the section is empty.
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The following keys are accepted:</para>
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<variablelist class='network-directives'>
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<varlistentry>
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<term><varname>MACAddress=</varname></term>
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<listitem>
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<para>The hardware address.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Path=</varname></term>
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<listitem>
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<para>The persistent path, as exposed by the
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udev property <literal>ID_PATH</literal>. May
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contain shell style globs.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Driver=</varname></term>
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<listitem>
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<para>The driver currently bound to the device,
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as exposed by the udev property <literal>DRIVER</literal>
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of its parent device, or if that is not set, the
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driver as exposed by <literal>ethtool -i</literal>
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of the device itself.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Type=</varname></term>
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<listitem>
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<para>The device type, as exposed by the udev
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property <literal>DEVTYPE</literal>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Host=</varname></term>
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<listitem>
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<para>Matches against the hostname or machine
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ID of the host. See <literal>ConditionHost=</literal> in
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for details.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Virtualization=</varname></term>
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<listitem>
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<para>Checks whether the system is executed in
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a virtualized environment and optionally test
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whether it is a specific implementation. See
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<literal>ConditionVirtualization=</literal> in
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for details.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>KernelCommandLine=</varname></term>
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<listitem>
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<para>Checks whether a specific kernel command
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line option is set (or if prefixed with the
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exclamation mark unset). See
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<literal>ConditionKernelCommandLine=</literal> in
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for details.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Architecture=</varname></term>
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<listitem>
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<para>Checks whether the system is running on a
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specific architecture. See
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<literal>ConditionArchitecture=</literal> in
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for details.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>[Link] Section Options</title>
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<para>The <literal>[Link]</literal> section accepts the following
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keys:</para>
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<variablelist class='network-directives'>
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<varlistentry>
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<term><varname>Description=</varname></term>
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<listitem>
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<para>A description of the device.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Alias=</varname></term>
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<listitem>
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<para>The <literal>ifalias</literal> is set to
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this value.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>MACAddressPolicy=</varname></term>
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<listitem>
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<para>The policy by which the MAC address
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should be set. The available policies are:
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</para>
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<variablelist>
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<varlistentry>
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<term><literal>persistent</literal></term>
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<listitem>
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<para>If the hardware has a persistent
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MAC address, as most hardware should,
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and if it is used by the kernel, nothing
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is done. Otherwise, a new MAC address
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is generated which is guaranteed to be
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the same on every boot for the given
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machine and the given device, but which
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is otherwise random.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>random</literal></term>
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<listitem>
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<para>If the kernel is using a random MAC
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address, nothing is done. Otherwise, a new
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address is randomly generated each time the
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device appears, typically at boot.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>MACAddress=</varname></term>
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<listitem>
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<para>The MAC address to use, if no
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<literal>MACAddressPolicy=</literal>
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is specified.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>NamePolicy=</varname></term>
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<listitem>
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<para>An ordered, space-separated list of
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policies by which the interface name should
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be set. <literal>NamePolicy</literal> may be
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disabled by specifying
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<literal>net.ifnames=0</literal> on the kernel
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commandline. Each of the policies may fail, and
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the first successful one is used. The name is
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not set directly, but is exported to udev as
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the property <literal>ID_NET_NAME</literal>,
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which is, by default, used by a udev rule to set
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<literal>NAME</literal>. If the name has already
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been set by userspace, no renaming is performed.
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The available policies are:</para>
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<variablelist>
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<varlistentry>
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<term><literal>kernel</literal></term>
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<listitem>
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<para>If the kernel claims that the name it
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has set for a device is predictable, then
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no renaming is performed.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>database</literal></term>
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<listitem>
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<para>The name is set based on entries in
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the udev's Hardware Database with the key
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<literal>ID_NET_NAME_FROM_DATABASE</literal>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>onboard</literal></term>
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<listitem>
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<para>The name is set based on information given by
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the firmware for on-board devices, as exported by
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the udev property <literal>ID_NET_NAME_ONBOARD</literal>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>slot</literal></term>
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<listitem>
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<para>The name is set based on information given by
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the firmware for hot-plug devices, as exported by
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the udev property <literal>ID_NET_NAME_SLOT</literal>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>path</literal></term>
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<listitem>
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<para>The name is set based on the device's physical
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location, as exported by the udev property
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<literal>ID_NET_NAME_PATH</literal>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>mac</literal></term>
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<listitem>
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<para>The name is set based on the device's
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persistent MAC address, as exported by the udev
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property <literal>ID_NET_NAME_MAC</literal>.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Name=</varname></term>
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<listitem>
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<para>The interface name to use in case all the
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policies specified in
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<varname>NamePolicy=</varname> fail, or in case
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<varname>NamePolicy=</varname> is missing or
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disabled.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>MTUBytes=</varname></term>
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<listitem>
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<para>The maximum transmission unit in bytes to
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set for the device. The usual suffixes K, M, G,
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are supported and are understood to the base of
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1024.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>BitsPerSecond=</varname></term>
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<listitem>
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<para>The speed to set for the device, the
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value is rounded down to the nearest Mbps.
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The usual suffixes K, M, G, are supported and
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are understood to the base of 1000.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Duplex=</varname></term>
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<listitem>
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<para>The duplex mode to set for the device.
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The accepted values are <literal>half</literal>
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and <literal>full</literal>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>WakeOnLan=</varname></term>
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<listitem>
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<para>The Wake-on-LAN policy to set for the
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device. The supported values are:</para>
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<variablelist>
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<varlistentry>
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<term><literal>phy</literal></term>
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<listitem>
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<para>Wake on PHY activity.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>magic</literal></term>
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<listitem>
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<para>Wake on receipt of a magic packet.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>off</literal></term>
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<listitem>
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<para>Never wake.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Example</title>
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<example>
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<title>/etc/systemd/network/wireless.link</title>
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<programlisting>[Match]
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MACAddress=12:34:56:78:9a:bc
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Driver=brcmsmac
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Path=pci-0000:02:00.0-*
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Type=wlan
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Virtualization=no
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Host=my-laptop
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Architecture=x86-64
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[Link]
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Name=wireless0
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MTUBytes=1450
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BitsPerSecond=10M
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WakeOnLan=magic
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MACAddress=cb:a9:87:65:43:21</programlisting>
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</example>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry>
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<refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum>
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</citerefentry>
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</para>
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</refsect1>
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|
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</refentry>
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