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

[Fabian Grünbichler]

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?

>  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

>                          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'`..

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?

> +                                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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