only add VM chains if VM firewall is enabled

Before if a NIC had the firewall enabled and the MAC filter was active,
a rule was added to the tap device even if the VM firewall was not
enabled. This led to nested machines not being able to reach outside.

Testcase: Host <-> VM <-> CT all on the same bridge. Host and CT could
not reach each other because of the MAC filter.

Now we check if the VM firewall is enabled and only add the MAC and
IP filters then.

Signed-off-by: Mira Limbeck <m.limbeck@proxmox.com>
(cherry picked from commit 033a15b372734fcfb390c3b747f67bfa4643dabd)

diff --git a/src/PVE/Firewall.pm b/src/PVE/Firewall.pm
index 7585aceb4c03309af2820076fbb85326e40e9b9f..781a7548327682744acbd8bb44a09494e90674ee 100644 (file)
--- a/src/PVE/Firewall.pm
+++ b/src/PVE/Firewall.pm
@@ -2359,10 +2359,10 @@ sub generate_tap_rules_direction {
     my $ipfilter_ipset = compute_ipset_chain_name($vmid, $ipfilter_name, $ipversion)
        if $options->{ipfilter} || $vmfw_conf->{ipset}->{$ipfilter_name};
 
-    # create chain with mac and ip filter
-    ruleset_create_vm_chain($ruleset, $tapchain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction);
-
     if ($options->{enable}) {
+       # create chain with mac and ip filter
+       ruleset_create_vm_chain($ruleset, $tapchain, $ipversion, $options, $macaddr, $ipfilter_ipset, $direction);
+
        ruleset_generate_vm_rules($ruleset, $rules, $cluster_conf, $vmfw_conf, $tapchain, $netid, $direction, $options, $ipversion, $vmid);
 
        ruleset_generate_vm_ipsrules($ruleset, $options, $direction, $iface);