[PATCH pve-network v2 05/11] sdn: evpn: derive IP version from CIDR for gateway-less subnets

[Hannes Laimer <h.laimer@proxmox.com>]

The IP version was derived from the gateway alone, falling back to
IPv4 when no gateway was set. This silently skipped the IPv6 setup
for gateway-less IPv6 subnets. Fall back to the subnet CIDR.

Signed-off-by: Hannes Laimer <h.laimer@proxmox.com>
---
 src/PVE/Network/SDN/Zones/EvpnPlugin.pm | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/PVE/Network/SDN/Zones/EvpnPlugin.pm b/src/PVE/Network/SDN/Zones/EvpnPlugin.pm
index 5df7e5f..a7daced 100644
--- a/src/PVE/Network/SDN/Zones/EvpnPlugin.pm
+++ b/src/PVE/Network/SDN/Zones/EvpnPlugin.pm
@@ -238,6 +238,7 @@ sub generate_sdn_config {
         my $subnet = $subnets->{$subnetid};
         my $cidr = $subnet->{cidr};
         my $mask = $subnet->{mask};
+        my ($subnet_ip) = split(/\//, $cidr);
 
         my $gateway = $subnet->{gateway};
         if ($gateway) {
@@ -247,7 +248,12 @@ sub generate_sdn_config {
 
         my $iptables = undef;
         my $checkrouteip = undef;
-        my $ipversion = Net::IP::ip_is_ipv6($gateway) ? 6 : 4;
+        my $ipversion = 4;
+        if ($gateway) {
+            $ipversion = Net::IP::ip_is_ipv6($gateway) ? 6 : 4;
+        } elsif ($subnet_ip) {
+            $ipversion = Net::IP::ip_is_ipv6($subnet_ip) ? 6 : 4;
+        }
 
         if ($ipversion == 6) {
             $ipv6 = 1;
-- 
2.47.3