From e68ebda4f1097e825d69e4c3e986bd529f874d0d Mon Sep 17 00:00:00 2001
From: Stefan Hanreich <s.hanreich@proxmox.com>
Date: Fri, 12 Apr 2024 10:07:32 +0200
Subject: [PATCH] fix #545: interfaces: allow arbitrary bridge names in network
 config
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Similar to other interface types, we can detect a bridge by the
presence of its bridge_ports attribute, rather than solely relying on
the "vmbr" ifname prefix heuristic. For OVS bridges we need to examine
the OVS type instead.

The check needs to be moved up since other prefixes could
theoretically be included in a bridge name and then would otherwise
get picked up wrongly.

Also added a warning for interfaces named vmbrX that are not bridges
to catch possible misconfigurations.

Originally-by: Jillian Morgan <jillian.morgan@primordial.ca>
Reviewed-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
Signed-off-by: Stefan Hanreich <s.hanreich@proxmox.com>
---
 src/PVE/INotify.pm | 28 +++++++++++++++-------------
 1 file changed, 15 insertions(+), 13 deletions(-)

diff --git a/src/PVE/INotify.pm b/src/PVE/INotify.pm
index 6432295..4568593 100644
--- a/src/PVE/INotify.pm
+++ b/src/PVE/INotify.pm
@@ -22,6 +22,7 @@ use PVE::Network;
 use PVE::ProcFSTools;
 use PVE::SafeSyslog;
 use PVE::Tools;
+use PVE::RESTEnvironment qw(log_warn);
 
 use base 'Exporter';
 
@@ -1033,7 +1034,17 @@ sub __read_etc_network_interfaces {
     foreach my $iface (sort keys %$ifaces) {
 	my $d = $ifaces->{$iface};
 	$d->{type} = 'unknown';
-	if ($iface =~ m/^bond\d+$/) {
+	if (defined $d->{'bridge_ports'}) {
+	    $d->{type} = 'bridge';
+	    if (!defined ($d->{bridge_stp})) {
+		$d->{bridge_stp} = 'off';
+	    }
+	    if (!defined($d->{bridge_fd}) && $d->{bridge_stp} eq 'off') {
+		$d->{bridge_fd} = 0;
+	    }
+	} elsif ($d->{ovs_type} && $d->{ovs_type} eq 'OVSBridge') {
+	    $d->{type} = $d->{ovs_type};
+	} elsif ($iface =~ m/^bond\d+$/) {
 	    if (!$d->{ovs_type}) {
 		$d->{type} = 'bond';
 	    } elsif ($d->{ovs_type} eq 'OVSBond') {
@@ -1053,18 +1064,6 @@ sub __read_etc_network_interfaces {
 		my $tag = &$extract_ovs_option($d, 'tag');
 		$d->{ovs_tag} = $tag if defined($tag);
 	    }
-	} elsif ($iface =~ m/^vmbr\d+$/) {
-	    if (!$d->{ovs_type}) {
-		$d->{type} = 'bridge';
-		if (!defined ($d->{bridge_stp})) {
-		    $d->{bridge_stp} = 'off';
-		}
-		if (!defined($d->{bridge_fd}) && $d->{bridge_stp} eq 'off') {
-		    $d->{bridge_fd} = 0;
-		}
-	    } elsif ($d->{ovs_type} eq 'OVSBridge') {
-		$d->{type} = $d->{ovs_type};
-	    }
 	} elsif ($iface =~ m/^(\S+):\d+$/) {
 	    $d->{type} = 'alias';
 	    if (defined ($ifaces->{$1})) {
@@ -1127,6 +1126,9 @@ sub __read_etc_network_interfaces {
 	    }
 	}
 
+	log_warn("detected a interface $iface that is not a bridge!")
+	    if !($d->{type} eq 'OVSBridge' || $d->{type} eq 'bridge') && $iface =~ m/^vmbr\d+$/;
+
 	# map address and netmask to cidr
 	if (my $addr = $d->{address}) {
 	    if (_address_is_cidr($addr)) {