From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from firstgate.proxmox.com (firstgate.proxmox.com [212.224.123.68]) by lore.proxmox.com (Postfix) with ESMTPS id A2E2B1FF138 for ; Mon, 01 Jun 2026 17:16:30 +0200 (CEST) Received: from firstgate.proxmox.com (localhost [127.0.0.1]) by firstgate.proxmox.com (Proxmox) with ESMTP id 6FF5932513; Mon, 1 Jun 2026 17:16:30 +0200 (CEST) From: Lukas Sichert To: pve-devel@lists.proxmox.com Subject: [PATCH network 1/4] sdn: evpn: enable force_forwarding for ipv6 forwarding to subnets Date: Mon, 1 Jun 2026 17:15:43 +0200 Message-ID: <20260601151550.118977-2-l.sichert@proxmox.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260601151550.118977-1-l.sichert@proxmox.com> References: <20260601151550.118977-1-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: 1780326922429 X-SPAM-LEVEL: Spam detection results: 0 AWL 0.355 Adjusted score from AWL reputation of From: address BAYES_00 -1.9 Bayes spam probability is 0 to 1% DMARC_MISSING 0.1 Missing DMARC policy KAM_DMARC_STATUS 0.01 Test Rule for DKIM or SPF Failure with Strict Alignment SPF_HELO_NONE 0.001 SPF: HELO does not publish an SPF Record T_SPF_PERMERROR 0.01 SPF: test of record failed (permerror) Message-ID-Hash: ICP44WARJHD5TRWQJ35SAE3YKJK7VEIJ X-Message-ID-Hash: ICP44WARJHD5TRWQJ35SAE3YKJK7VEIJ 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 and an outgoing interface. 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 both the VNet interface and the outgoing interface. Track interfaces that already received 'force_forwarding' commands to avoid duplicates when multiple subnets share the same outgoing path. Update the expected SDN interface output in the zone tests accordingly. Signed-off-by: Lukas Sichert --- src/PVE/Network/SDN/Zones/EvpnPlugin.pm | 20 +++++++++++++++---- .../expected_sdn_interfaces | 4 ++++ .../exitnode_snat/expected_sdn_interfaces | 4 ++++ .../exitnodenullroute/expected_sdn_interfaces | 4 ++++ .../evpn/ipv4ipv6/expected_sdn_interfaces | 4 ++++ .../zones/evpn/ipv6/expected_sdn_interfaces | 4 ++++ .../evpn/ipv6underlay/expected_sdn_interfaces | 4 ++++ 7 files changed, 40 insertions(+), 4 deletions(-) diff --git a/src/PVE/Network/SDN/Zones/EvpnPlugin.pm b/src/PVE/Network/SDN/Zones/EvpnPlugin.pm index dfbd7e9..7622457 100644 --- a/src/PVE/Network/SDN/Zones/EvpnPlugin.pm +++ b/src/PVE/Network/SDN/Zones/EvpnPlugin.pm @@ -238,11 +238,13 @@ sub generate_sdn_config { my $ipv6 = undef; my $enable_forward_v4 = undef; my $enable_forward_v6 = undef; + my $force_forward_enabled = {}; my $subnets = PVE::Network::SDN::Vnets::get_subnets($vnetid, 1); foreach my $subnetid (sort keys %{$subnets}) { my $subnet = $subnets->{$subnetid}; my $cidr = $subnet->{cidr}; my $mask = $subnet->{mask}; + my $vnet = $subnet->{vnet}; my $gateway = $subnet->{gateway}; if ($gateway) { @@ -266,11 +268,21 @@ sub generate_sdn_config { $enable_forward_v4 = 1 if $gateway; } - if ($subnet->{snat}) { + #find outgoing interface + my ($outip, $outiface) = + PVE::Network::SDN::Zones::Plugin::get_local_route_ip($checkrouteip); + + if ($outiface && $enable_forward_v6 && !($force_forward_enabled->{$outiface})) { + push @iface_config, + "post-up echo 1 > /proc/sys/net/ipv6/conf/$outiface/force_forwarding"; + push @iface_config, + "post-down echo 0 > /proc/sys/net/ipv6/conf/$outiface/force_forwarding"; + push @iface_config, "post-up echo 1 > /proc/sys/net/ipv6/conf/$vnet/force_forwarding"; + push @iface_config, "post-down echo 0 > /proc/sys/net/ipv6/conf/$vnet/force_forwarding"; + $force_forward_enabled->{$outiface} = 1; + } - #find outgoing interface - my ($outip, $outiface) = - PVE::Network::SDN::Zones::Plugin::get_local_route_ip($checkrouteip); + if ($subnet->{snat}) { if ($outip && $outiface && $is_evpn_gateway) { #use snat, faster than masquerade push @iface_config, 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..e620e15 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 @@ -3,6 +3,10 @@ auto myvnet iface myvnet address 2a08:2142:302:3::1/64 + post-up echo 1 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding + post-down echo 0 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding + post-up echo 1 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding + post-down echo 0 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding bridge_ports vxlan_myvnet bridge_stp off bridge_fd 0 diff --git a/src/test/zones/evpn/exitnode_snat/expected_sdn_interfaces b/src/test/zones/evpn/exitnode_snat/expected_sdn_interfaces index 0d7d174..bdd6dd3 100644 --- a/src/test/zones/evpn/exitnode_snat/expected_sdn_interfaces +++ b/src/test/zones/evpn/exitnode_snat/expected_sdn_interfaces @@ -18,6 +18,10 @@ iface myvnet auto myvnet2 iface myvnet2 address 2a08:2142:302:3::1/64 + post-up echo 1 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding + post-down echo 0 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding + 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 ip6tables -t nat -A POSTROUTING -s '2a08:2142:302:3::/64' -o vmbr0 -j SNAT --to-source 2001:db8::2 post-down ip6tables -t nat -D POSTROUTING -s '2a08:2142:302:3::/64' -o vmbr0 -j SNAT --to-source 2001:db8::2 post-up ip6tables -t raw -I PREROUTING -i fwbr+ -j CT --zone 1 diff --git a/src/test/zones/evpn/exitnodenullroute/expected_sdn_interfaces b/src/test/zones/evpn/exitnodenullroute/expected_sdn_interfaces index 4bf5ccf..557ccd3 100644 --- a/src/test/zones/evpn/exitnodenullroute/expected_sdn_interfaces +++ b/src/test/zones/evpn/exitnodenullroute/expected_sdn_interfaces @@ -6,6 +6,10 @@ iface myvnet address 192.168.0.1/24 address 192.168.10.1/24 address 2b0f:1480:4000:6000::1/64 + post-up echo 1 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding + post-down echo 0 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding + post-up echo 1 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding + post-down echo 0 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding address 2b0f:1480:4000:8000::1/64 address 2b0f:1480::1/64 bridge_ports vxlan_myvnet diff --git a/src/test/zones/evpn/ipv4ipv6/expected_sdn_interfaces b/src/test/zones/evpn/ipv4ipv6/expected_sdn_interfaces index 7a5d741..fcff2ba 100644 --- a/src/test/zones/evpn/ipv4ipv6/expected_sdn_interfaces +++ b/src/test/zones/evpn/ipv4ipv6/expected_sdn_interfaces @@ -4,6 +4,10 @@ auto myvnet iface myvnet address 10.0.0.1/24 address 2a08:2142:302:3::1/64 + post-up echo 1 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding + post-down echo 0 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding + post-up echo 1 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding + post-down echo 0 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding hwaddress A2:1D:CB:1A:C0:8B bridge_ports vxlan_myvnet bridge_stp off diff --git a/src/test/zones/evpn/ipv6/expected_sdn_interfaces b/src/test/zones/evpn/ipv6/expected_sdn_interfaces index b2bdbfe..2ab9bf9 100644 --- a/src/test/zones/evpn/ipv6/expected_sdn_interfaces +++ b/src/test/zones/evpn/ipv6/expected_sdn_interfaces @@ -3,6 +3,10 @@ auto myvnet iface myvnet address 2a08:2142:302:3::1/64 + post-up echo 1 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding + post-down echo 0 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding + post-up echo 1 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding + post-down echo 0 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding hwaddress A2:1D:CB:1A:C0:8B bridge_ports vxlan_myvnet bridge_stp off diff --git a/src/test/zones/evpn/ipv6underlay/expected_sdn_interfaces b/src/test/zones/evpn/ipv6underlay/expected_sdn_interfaces index 3b91f75..624f38a 100644 --- a/src/test/zones/evpn/ipv6underlay/expected_sdn_interfaces +++ b/src/test/zones/evpn/ipv6underlay/expected_sdn_interfaces @@ -3,6 +3,10 @@ auto myvnet iface myvnet address 2a08:2142:302:3::1/64 + post-up echo 1 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding + post-down echo 0 > /proc/sys/net/ipv6/conf/vmbr0/force_forwarding + post-up echo 1 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding + post-down echo 0 > /proc/sys/net/ipv6/conf/myvnet/force_forwarding hwaddress A2:1D:CB:1A:C0:8B bridge_ports vxlan_myvnet bridge_stp off -- 2.47.3