[PATCH pve-network v3 6/9] 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>
---

Notes:
    v3:
     - derive the IP version from the CIDR for gateway-less subnets

 src/PVE/Network/SDN/Zones/EvpnPlugin.pm | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/PVE/Network/SDN/Zones/EvpnPlugin.pm b/src/PVE/Network/SDN/Zones/EvpnPlugin.pm
index d8bfa80..9c3304c 100644
--- a/src/PVE/Network/SDN/Zones/EvpnPlugin.pm
+++ b/src/PVE/Network/SDN/Zones/EvpnPlugin.pm
@@ -252,7 +252,12 @@ 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->{network}) {
+            $ipversion = Net::IP::ip_is_ipv6($subnet->{network}) ? 6 : 4;
+        }
 
         if ($ipversion == 6) {
             $ipv6 = 1;
-- 
2.47.3