[PATCH docs/network/perl-rs 0/4] sdn: enable force_forwarding for ipv6 forwarding

[Lukas Sichert <l.sichert@proxmox.com>]

Gabriel's upstream kernel patch [1] added
net.ipv6.conf.<iface>.force_forwarding. This allows enabling IPv6
forwarding on selected interfaces without requiring
net.ipv6.conf.all.forwarding.

This is useful for SDN setups because all.forwarding has host-wide side
effects. In particular, it disables Router Advertisement processing by
default, which can break SLAAC on unrelated interfaces. SDN only needs
forwarding on the VNet, exit-node, or fabric interfaces that participate
in routed IPv6 traffic.

This series generates ifupdown post-up/post-down commands for those
interfaces so force_forwarding is enabled when the interface is brought
up and reset when it is brought down.
The tests are adjusted for the generated /etc/network/interfaces.d/sdn
output.
Also the series rewrite the documenation to reflect the updated
behaviour.


[1] lkml.org/lkml/2025/7/7/577


network:

Lukas Sichert (2):
  sdn: evpn: enable force_forwarding for ipv6 forwarding to subnets
  sdn: simple: enable force_forwarding for ipv6 forwarding to subnets

 src/PVE/Network/SDN/Zones/EvpnPlugin.pm       | 20 +++++++++++++++----
 src/PVE/Network/SDN/Zones/SimplePlugin.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 ++++
 .../simple/ipv4v6/expected_sdn_interfaces     |  4 ++++
 .../simple/ipv6snat/expected_sdn_interfaces   |  4 ++++
 10 files changed, 64 insertions(+), 8 deletions(-)


perl-rs:

Lukas Sichert (1):
  fabrics: openfabric: enable force_forwarding for ipv6 transit traffic

 pve-rs/src/bindings/sdn/fabrics.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)


docs:

Lukas Sichert (1):
  sdn: drop global IPv6 forwarding workaround from OpenFabric docs

 pvesdn.adoc | 18 +++---------------
 1 file changed, 3 insertions(+), 15 deletions(-)


Summary over all repositories:
  12 files changed, 77 insertions(+), 23 deletions(-)

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