[pve-devel] [PATCH v7 pve-network 19/21] zones: evpn|simple: add snat iptables rules

[Alexandre Derumier]

(use snat instead masquerade for performance)
---
 PVE/Network/SDN/Zones/EvpnPlugin.pm   | 18 ++++++++++++++++++
 PVE/Network/SDN/Zones/SimplePlugin.pm | 12 ++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/PVE/Network/SDN/Zones/EvpnPlugin.pm b/PVE/Network/SDN/Zones/EvpnPlugin.pm
index ff25f12..b89f4b1 100644
--- a/PVE/Network/SDN/Zones/EvpnPlugin.pm
+++ b/PVE/Network/SDN/Zones/EvpnPlugin.pm
@@ -51,6 +51,7 @@ sub generate_sdn_config {
 
     my $vrf_iface = "vrf_$zoneid";
     my $vrfvxlan = $plugin_config->{'vrf-vxlan'};
+    my $local_node = PVE::INotify::nodename();
 
     die "missing vxlan tag" if !$tag;
     warn "vlan-aware vnet can't be enabled with evpn plugin" if $vnet->{vlanaware};
@@ -86,6 +87,23 @@ sub generate_sdn_config {
 	    push @iface_config, "address $gateway" if !defined($address->{$gateway});
 	    $address->{$gateway} = 1;
 	}
+	if ($subnet->{snat}) {
+	    my $gatewaynodes = $controller->{'gateway-nodes'};
+	    my $is_evpn_gateway = "";
+	    foreach my $evpn_gatewaynode (PVE::Tools::split_list($gatewaynodes)) {
+		$is_evpn_gateway = 1 if $evpn_gatewaynode eq $local_node;
+	    }
+            #find outgoing interface
+            my ($outip, $outiface) = PVE::Network::SDN::Zones::Plugin::get_local_route_ip('8.8.8.8');
+            if ($outip && $outiface && $is_evpn_gateway) {
+                #use snat, faster than masquerade
+                push @iface_config, "post-up iptables -t nat -A POSTROUTING -s '$cidr' -o $outiface -j SNAT --to-source $outip";
+                push @iface_config, "post-down iptables -t nat -D POSTROUTING -s '$cidr' -o $outiface -j SNAT --to-source $outip";
+                #add conntrack zone once on outgoing interface
+                push @iface_config, "post-up iptables -t raw -I PREROUTING -i fwbr+ -j CT --zone 1";
+                push @iface_config, "post-down iptables -t raw -D PREROUTING -i fwbr+ -j CT --zone 1";
+            }
+        }
     }
 
     push @iface_config, "hwaddress $mac" if $mac;
diff --git a/PVE/Network/SDN/Zones/SimplePlugin.pm b/PVE/Network/SDN/Zones/SimplePlugin.pm
index a4299dd..c58ae87 100644
--- a/PVE/Network/SDN/Zones/SimplePlugin.pm
+++ b/PVE/Network/SDN/Zones/SimplePlugin.pm
@@ -48,6 +48,18 @@ sub generate_sdn_config {
 	#add route for /32 pointtopoint
 	my ($ip, $mask) = split(/\//, $cidr);
 	push @iface_config, "up ip route add $cidr dev $vnetid" if $mask == 32;
+	if ($subnet->{snat}) {
+	    #find outgoing interface
+	    my ($outip, $outiface) = PVE::Network::SDN::Zones::Plugin::get_local_route_ip('8.8.8.8');
+	    if ($outip && $outiface) {
+		#use snat, faster than masquerade
+		push @iface_config, "post-up iptables -t nat -A POSTROUTING -s '$cidr' -o $outiface -j SNAT --to-source $outip";
+		push @iface_config, "post-down iptables -t nat -D POSTROUTING -s '$cidr' -o $outiface -j SNAT --to-source $outip";
+		#add conntrack zone once on outgoing interface
+		push @iface_config, "post-up iptables -t raw -I PREROUTING -i fwbr+ -j CT --zone 1";
+		push @iface_config, "post-down iptables -t raw -D PREROUTING -i fwbr+ -j CT --zone 1";
+	    }
+	}
     }
 
     push @iface_config, "hwaddress $mac" if $mac;
-- 
2.20.1