[pve-devel] [PATCH pve-common] inotify: interfaces: also set type 'bridge' for empty bridges

[Hannes Laimer]

On 08.08.25 10:40, Fabian Grünbichler wrote:
> On August 7, 2025 4:21 pm, Hannes Laimer wrote:
>> If a bridge has `bridge_ports` set to `none` we just skip the field.
>> Later we use the existance of the field to determine whether the type
>> should be `bridge`. This led to bridges without `bridge_ports` not
>> being recognized as bridges.
>>
>> In the `/nodes/{}/network` we do permissions checks but only for ifaces
>> with type `bridge`(or `OVSBridge`). So interfaces were returned by the
>> endpoint even if the user did not have permissions the correct
>> permissions because the interface did not have type `bridge`.
>>
>> This fixes this by also setting the type to `bridge` for empty bridges.
>>
>> Signed-off-by: Hannes Laimer <h.laimer at proxmox.com>
>> ---
> 
> Note: this patch is likely a candidate for stable-bookworm as well?
> 

yup, this is not new

>>   src/PVE/INotify.pm | 8 ++++++--
>>   1 file changed, 6 insertions(+), 2 deletions(-)
>>
>> diff --git a/src/PVE/INotify.pm b/src/PVE/INotify.pm
>> index bbcb9f8..5a42ddd 100644
>> --- a/src/PVE/INotify.pm
>> +++ b/src/PVE/INotify.pm
>> @@ -994,7 +994,10 @@ SECTION: while (defined($line = <$fh>)) {
>>                       } elsif ($id eq 'slaves' || $id eq 'bridge_ports') {
> 
> this elsif here is taken for both bonds and bridges
>

true, thanks! missed that.

>>                           my $devs = {};
>>                           foreach my $p (split(/\s+/, $value)) {
>> -                            next if $p eq 'none';
>> +                            if ($p eq 'none') {
>> +                                $d->{'is_empty_bridge'} = 1;
> 
> so this here should be guarded with `if $id eq 'bridge_ports'`..
> 

will fix that

> do we also need special handling of "empty" bonds (which make less sense
> in practice, but might still exist?) - in particular if we ever plan on
> dropping the naming restrictions there?
> 

we allow something like this
```
auto bond0
iface bond0 inet manual
	bond-slaves none
	bond-miimon 100
	bond-mode balance-rr
```
to be set (even through the UI), but it does trip up `ifreload`. I think
we should at least not allow setting `bond_slaves none` through the UI.

>> +                                next;
>> +                            }
>>                               $devs->{$p} = 1;
>>                           }
>>                           my $str = join(' ', sort keys %{$devs});
>> @@ -1077,7 +1080,8 @@ OUTER:
>>   
>>           my $ip_link = $ip_links->{$altnames->{$iface} // $iface};
>>   
>> -        if (defined $d->{'bridge_ports'}) {
>> +        if (defined $d->{'bridge_ports'} || $d->{'is_empty_bridge'}) {
>> +            delete $d->{'is_empty_bridge'} if defined $d->{'is_empty_bridge'};
>>               $d->{type} = 'bridge';
>>               if (!defined($d->{bridge_stp})) {
>>                   $d->{bridge_stp} = 'off';
>> -- 
>> 2.47.2
>>
>>
>>
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>>
>>
>>
> 
> 
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