From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from gate001.proxmox.com (gate001.proxmox.com [IPv6:2a0f:8001:1:32::40]) by lore.proxmox.com (Postfix) with ESMTPS id 81BBD1FF0F0 for ; Mon, 27 Jul 2026 15:55:26 +0200 (CEST) Received: from gate001.proxmox.com (localhost.localdomain [127.0.0.1]) by gate001.proxmox.com (Proxmox) with ESMTP id 52ED1214A5; Mon, 27 Jul 2026 15:55:21 +0200 (CEST) From: Lukas Sichert To: pve-devel@lists.proxmox.com Subject: [PATCH network v4 1/6] sdn: evpn: enable force_forwarding for ipv6 forwarding to subnets Date: Mon, 27 Jul 2026 15:55:02 +0200 Message-ID: <20260727135509.14588-2-l.sichert@proxmox.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260727135509.14588-1-l.sichert@proxmox.com> References: <20260727135509.14588-1-l.sichert@proxmox.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Bm-Milter-Handled: 55990f41-d878-4baa-be0a-ee34c49e34d2 X-Bm-Transport-Timestamp: 1785160481807 X-SPAM-LEVEL: Spam detection results: 0 AWL 0.079 Adjusted score from AWL reputation of From: address DMARC_MISSING 0.1 Missing DMARC policy KAM_DMARC_STATUS 0.01 Test Rule for DKIM or SPF Failure with Strict Alignment (newer systems) RCVD_IN_DNSWL_LOW -0.7 Sender listed at https://www.dnswl.org/, low trust SPF_HELO_NONE 0.001 SPF: HELO does not publish an SPF Record SPF_PASS -0.001 SPF: sender matches SPF record Message-ID-Hash: RE6RN54SKOV3VCWXUDFUI5NHWDLLPJJE X-Message-ID-Hash: RE6RN54SKOV3VCWXUDFUI5NHWDLLPJJE X-MailFrom: l.sichert@proxmox.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; loop; banned-address; emergency; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Lukas Sichert X-Mailman-Version: 3.3.10 Precedence: list List-Id: Proxmox VE development discussion List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: EVPN zones can route IPv6 subnet traffic through a VNet, an outgoing interface, and, for L3VNI setups, a VRF bridge. Until now, this depended on global IPv6 forwarding state, which also changes Router Advertisement handling for the whole host. Use the per-interface 'force_forwarding' setting instead. For IPv6 subnets that need forwarding, generate post-up/post-down commands for the VNet interface, the outgoing interface, and the EVPN VRF bridge where applicable. Update the expected SDN interface output in the zone tests accordingly Signed-off-by: Lukas Sichert --- src/PVE/Network/SDN/Zones/EvpnPlugin.pm | 34 ++++++++++++++++++- .../expected_sdn_interfaces | 6 ++++ .../exitnode_snat/expected_sdn_interfaces | 4 +++ .../exitnodenullroute/expected_sdn_interfaces | 6 ++++ .../evpn/ipv4ipv6/expected_sdn_interfaces | 4 +++ .../zones/evpn/ipv6/expected_sdn_interfaces | 4 +++ .../evpn/ipv6underlay/expected_sdn_interfaces | 4 +++ 7 files changed, 61 insertions(+), 1 deletion(-) diff --git a/src/PVE/Network/SDN/Zones/EvpnPlugin.pm b/src/PVE/Network/SDN/Zones/EvpnPlugin.pm index 0e79707..80de5bf 100644 --- a/src/PVE/Network/SDN/Zones/EvpnPlugin.pm +++ b/src/PVE/Network/SDN/Zones/EvpnPlugin.pm @@ -302,7 +302,32 @@ sub generate_sdn_config { push @iface_config, "mtu $mtu" if $mtu; push @iface_config, "alias $alias" if $alias; push @iface_config, "ip-forward on" if $enable_forward_v4; - push @iface_config, "ip6-forward on" if $enable_forward_v6; + + if ($enable_forward_v6) { + push @iface_config, "ip6-forward on"; + + push @iface_config, "post-up echo 1 > /proc/sys/net/ipv6/conf/$vnetid/force_forwarding"; + push @iface_config, "post-down echo 0 > /proc/sys/net/ipv6/conf/$vnetid/force_forwarding"; + + if ($is_evpn_gateway) { + #find outgoing ipv6 interface + my ($outip, $outiface); + eval { + ($outip, $outiface) = + PVE::Network::SDN::Zones::Plugin::get_local_route_ip('2001:4860:4860::8888'); + }; + if ($@) { + my $msg = "interface for IPv6 forwarding could not be resolved: $@"; + log_warn($msg); + } elsif ($outiface) { + push @iface_config, + "post-up echo 1 > /proc/sys/net/ipv6/conf/$outiface/force_forwarding"; + push @iface_config, + "post-down echo 0 > /proc/sys/net/ipv6/conf/$outiface/force_forwarding"; + } + } + } + push @iface_config, "arp-accept on" if $ipv4 || $ipv6; push @iface_config, "vrf $vrf_iface" if $vrf_iface; push(@{ $config->{$vnetid} }, @iface_config) if !$config->{$vnetid}; @@ -342,6 +367,13 @@ sub generate_sdn_config { push @iface_config, "bridge_fd 0"; push @iface_config, "mtu $mtu" if $mtu; push @iface_config, "vrf $vrf_iface"; + + if ($enable_forward_v6) { + push @iface_config, + "post-up echo 1 > /proc/sys/net/ipv6/conf/$brvrf/force_forwarding"; + push @iface_config, + "post-down echo 0 > /proc/sys/net/ipv6/conf/$brvrf/force_forwarding"; + } push(@{ $config->{$brvrf} }, @iface_config) if !$config->{$brvrf}; } diff --git a/src/test/zones/evpn/exitnode_local_routing_ipv6/expected_sdn_interfaces b/src/test/zones/evpn/exitnode_local_routing_ipv6/expected_sdn_interfaces index b46d4e7..7b8dc3c 100644 --- a/src/test/zones/evpn/exitnode_local_routing_ipv6/expected_sdn_interfaces +++ b/src/test/zones/evpn/exitnode_local_routing_ipv6/expected_sdn_interfaces @@ -8,6 +8,10 @@ iface myvnet bridge_fd 0 mtu 1450 ip6-forward on + post-up echo 1 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding + post-down echo 0 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding + post-up echo 1 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding + post-down echo 0 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding arp-accept on vrf vrf_myzone @@ -23,6 +27,8 @@ iface vrfbr_myzone bridge_fd 0 mtu 1450 vrf vrf_myzone + post-up echo 1 > /proc/sys/net/ipv6/conf/vrfbr_myzone/force_forwarding + post-down echo 0 > /proc/sys/net/ipv6/conf/vrfbr_myzone/force_forwarding auto vrfvx_myzone iface vrfvx_myzone diff --git a/src/test/zones/evpn/exitnode_snat/expected_sdn_interfaces b/src/test/zones/evpn/exitnode_snat/expected_sdn_interfaces index 0d7d174..2addde0 100644 --- a/src/test/zones/evpn/exitnode_snat/expected_sdn_interfaces +++ b/src/test/zones/evpn/exitnode_snat/expected_sdn_interfaces @@ -27,6 +27,10 @@ iface myvnet2 bridge_fd 0 mtu 1450 ip6-forward on + post-up echo 1 > /proc/sys/net/ipv6/conf/myvnet2/force_forwarding + post-down echo 0 > /proc/sys/net/ipv6/conf/myvnet2/force_forwarding + post-up echo 1 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding + post-down echo 0 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding arp-accept on vrf vrf_myzone diff --git a/src/test/zones/evpn/exitnodenullroute/expected_sdn_interfaces b/src/test/zones/evpn/exitnodenullroute/expected_sdn_interfaces index 4bf5ccf..e406258 100644 --- a/src/test/zones/evpn/exitnodenullroute/expected_sdn_interfaces +++ b/src/test/zones/evpn/exitnodenullroute/expected_sdn_interfaces @@ -14,6 +14,10 @@ iface myvnet mtu 1450 ip-forward on ip6-forward on + post-up echo 1 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding + post-down echo 0 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding + post-up echo 1 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding + post-down echo 0 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding arp-accept on vrf vrf_myzone @@ -47,6 +51,8 @@ iface vrfbr_myzone bridge_fd 0 mtu 1450 vrf vrf_myzone + post-up echo 1 > /proc/sys/net/ipv6/conf/vrfbr_myzone/force_forwarding + post-down echo 0 > /proc/sys/net/ipv6/conf/vrfbr_myzone/force_forwarding auto vrfbr_myzone2 iface vrfbr_myzone2 diff --git a/src/test/zones/evpn/ipv4ipv6/expected_sdn_interfaces b/src/test/zones/evpn/ipv4ipv6/expected_sdn_interfaces index 7a5d741..a1fdb2b 100644 --- a/src/test/zones/evpn/ipv4ipv6/expected_sdn_interfaces +++ b/src/test/zones/evpn/ipv4ipv6/expected_sdn_interfaces @@ -11,6 +11,8 @@ iface myvnet mtu 1450 ip-forward on ip6-forward on + post-up echo 1 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding + post-down echo 0 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding arp-accept on vrf vrf_myzone @@ -26,6 +28,8 @@ iface vrfbr_myzone bridge_fd 0 mtu 1450 vrf vrf_myzone + post-up echo 1 > /proc/sys/net/ipv6/conf/vrfbr_myzone/force_forwarding + post-down echo 0 > /proc/sys/net/ipv6/conf/vrfbr_myzone/force_forwarding auto vrfvx_myzone iface vrfvx_myzone diff --git a/src/test/zones/evpn/ipv6/expected_sdn_interfaces b/src/test/zones/evpn/ipv6/expected_sdn_interfaces index b2bdbfe..4363842 100644 --- a/src/test/zones/evpn/ipv6/expected_sdn_interfaces +++ b/src/test/zones/evpn/ipv6/expected_sdn_interfaces @@ -9,6 +9,8 @@ iface myvnet bridge_fd 0 mtu 1450 ip6-forward on + post-up echo 1 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding + post-down echo 0 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding arp-accept on vrf vrf_myzone @@ -24,6 +26,8 @@ iface vrfbr_myzone bridge_fd 0 mtu 1450 vrf vrf_myzone + post-up echo 1 > /proc/sys/net/ipv6/conf/vrfbr_myzone/force_forwarding + post-down echo 0 > /proc/sys/net/ipv6/conf/vrfbr_myzone/force_forwarding auto vrfvx_myzone iface vrfvx_myzone diff --git a/src/test/zones/evpn/ipv6underlay/expected_sdn_interfaces b/src/test/zones/evpn/ipv6underlay/expected_sdn_interfaces index 3b91f75..7aaf569 100644 --- a/src/test/zones/evpn/ipv6underlay/expected_sdn_interfaces +++ b/src/test/zones/evpn/ipv6underlay/expected_sdn_interfaces @@ -9,6 +9,8 @@ iface myvnet bridge_fd 0 mtu 1450 ip6-forward on + post-up echo 1 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding + post-down echo 0 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding arp-accept on vrf vrf_myzone @@ -24,6 +26,8 @@ iface vrfbr_myzone bridge_fd 0 mtu 1450 vrf vrf_myzone + post-up echo 1 > /proc/sys/net/ipv6/conf/vrfbr_myzone/force_forwarding + post-down echo 0 > /proc/sys/net/ipv6/conf/vrfbr_myzone/force_forwarding auto vrfvx_myzone iface vrfvx_myzone -- 2.47.3