[pve-devel] [PATCH pve-network v3] sdn: evpn: fix IPv6 exitnode local routing

[pve-devel] [PATCH pve-network v3] sdn: evpn: fix IPv6 exitnode local routing

[Hannes Laimer]

IPv6 subnets on exitnodes had no working local-routing path. Add a v6
address on the xvrf veth pair and install IPv6 routes via that next-hop.

Signed-off-by: Hannes Laimer <h.laimer@proxmox.com>
---
v3:
 - use fe80::1 and fd80::2 as suggested by @Stefan

v2:
 - change `address6` to `address`, ifreload2 does not pick up address6.
   Probably had the address still attached from manualy testing so I
   didn't notice when I tested this for v1

 src/PVE/Network/SDN/Controllers/EvpnPlugin.pm | 7 ++++++-
 src/PVE/Network/SDN/Zones/EvpnPlugin.pm       | 2 ++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/PVE/Network/SDN/Controllers/EvpnPlugin.pm b/src/PVE/Network/SDN/Controllers/EvpnPlugin.pm
index e53000a..cc21712 100644
--- a/src/PVE/Network/SDN/Controllers/EvpnPlugin.pm
+++ b/src/PVE/Network/SDN/Controllers/EvpnPlugin.pm
@@ -462,7 +462,12 @@ sub generate_vnet_frr_config {
     foreach my $subnetid (sort keys %{$subnets}) {
         my $subnet = $subnets->{$subnetid};
         my $cidr = $subnet->{cidr};
-        push @controller_config, "ip route $cidr 10.255.255.2 xvrf_$zoneid";
+        my ($ip) = split(/\//, $cidr, 2);
+        if (Net::IP::ip_is_ipv6($ip)) {
+            push @controller_config, "ipv6 route $cidr fe80::2 xvrf_$zoneid";
+        } else {
+            push @controller_config, "ip route $cidr 10.255.255.2 xvrf_$zoneid";
+        }
     }
     push(@{ $config->{frr_ip_protocol} }, @controller_config);
 }
diff --git a/src/PVE/Network/SDN/Zones/EvpnPlugin.pm b/src/PVE/Network/SDN/Zones/EvpnPlugin.pm
index 6d89499..8e7ddfd 100644
--- a/src/PVE/Network/SDN/Zones/EvpnPlugin.pm
+++ b/src/PVE/Network/SDN/Zones/EvpnPlugin.pm
@@ -327,6 +327,7 @@ sub generate_sdn_config {
             @iface_config = ();
             push @iface_config, "link-type veth";
             push @iface_config, "address 10.255.255.1/30";
+            push @iface_config, "address fe80::1/126" if $ipv6;
             push @iface_config, "veth-peer-name $iface_xvrfp";
             push @iface_config, "mtu " . ($mtu + 50) if $mtu;
             push(@{ $config->{$iface_xvrf} }, @iface_config) if !$config->{$iface_xvrf};
@@ -334,6 +335,7 @@ sub generate_sdn_config {
             @iface_config = ();
             push @iface_config, "link-type veth";
             push @iface_config, "address 10.255.255.2/30";
+            push @iface_config, "address fe80::2/126" if $ipv6;
             push @iface_config, "veth-peer-name $iface_xvrf";
             push @iface_config, "vrf $vrf_iface";
             push @iface_config, "mtu " . ($mtu + 50) if $mtu;
-- 
2.47.3



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