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network: support ID_NET_MANAGED_BY udev property

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If the property is set, networkd manages the interface only when its
value is "io.systemd.Network".

Closes #29768.
This commit is contained in:
Yu Watanabe 2023-10-31 18:07:08 +09:00 committed by Lennart Poettering
parent da79ae6fc5
commit ba87a61d05
2 changed files with 18 additions and 0 deletions
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8
man/systemd.network.xml
View file

@ -77,6 +77,14 @@
configured. The first (in alphanumeric order) of the network files that matches a given interface
is applied, all later files are ignored, even if they match as well.</para>
<para>Note that any network interfaces that have the <varname>ID_NET_MANAGED_BY=</varname> udev property
set will never be matched by any .network files – unless the property's value is the string
<literal>io.systemd.Network</literal> – even if the [Match] section would otherwise match. This may be
used to exclude specific network interfaces from <command>systemd-networkd</command>'s management, while
keeping the [Match] section generic. The <varname>ID_NET_MANAGED_BY=</varname> poperty thus declares
intended <emphasis>ownership</emphasis> of the device, and permits ensuring that concurrent network
management implementations do not compete for management of specific devices.</para>
<para>A network file is said to match a network interface if all matches specified by the [Match]
section are satisfied. When a network file does not contain valid settings in [Match] section, then
the file will match all interfaces and <command>systemd-networkd</command> warns about that. Hint:

10
src/network/networkd-link.c
View file

@ -1465,6 +1465,7 @@ static int link_check_initialized(Link *link) {
int manager_udev_process_link(Manager *m, sd_device *device, sd_device_action_t action) {
int r, ifindex;
const char *s;
Link *link;
assert(m);
@ -1499,6 +1500,15 @@ int manager_udev_process_link(Manager *m, sd_device *device, sd_device_action_t
return 0;
}
r = sd_device_get_property_value(device, "ID_NET_MANAGED_BY", &s);
if (r < 0 && r != -ENOENT)
log_device_debug_errno(device, r, "Failed to get ID_NET_MANAGED_BY udev property, ignoring: %m");
if (r >= 0 && !streq(s, "io.systemd.Network")) {
log_device_debug(device, "Interface is requested to be managed by '%s', not managing the interface.", s);
link_set_state(link, LINK_STATE_UNMANAGED);
return 0;
}
r = link_initialized(link, device);
if (r < 0)
link_enter_failed(link);