Hi,
On 14/05/2026 11:52, Marco Baffo wrote:
The ovpn DCO driver currently drops all multicast/broadcast packets
because it does not set IFF_MULTICAST and IFF_BROADCAST on the
netdevice and always performs a unicast peer lookup in ovpn_net_xmit().
This prevents multicast routing daemons such as smcroute from using an
ovpn interface as a multicast VIF and makes it impossible to
forward multicastand broadcast traffic to VPN clients.
Add the minimal infrastructure needed to get multicast/broadcast working:
- Set IFF_MULTICAST and IFF_BROADCAST in ovpn_setup().
- Detect multicast and broadcast destinations in
ovpn_peer_list_get_by_dst() and create a list with the target peers.
- Introduce ovpn_skb_list_clone() to clone GSO segment lists and
replicate the packet to every connected peer in
ovpn_net_xmit().
For now multicast traffic is flooded to all peers. A future
enhancement will replace the flood with a subscription table driven by
IGMP snooping.
Signed-off-by: Marco Baffo <[email protected]>
As discussed on IRC, we will move forward only with the first patch of
this batch.
The rest is not going to be further developed as we concluded there is
not much traction for such feature nowadays.
Regards,
--
Antonio Quartulli
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