netdev - Re: [PATCH net-next 5/8] ovpn: add support for asymmetric peer IDs

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Message-ID: <aRXj_--Rbimt-5yL@krikkit>
Date: Thu, 13 Nov 2025 14:58:23 +0100
From: Sabrina Dubroca <sd@...asysnail.net>
To: Antonio Quartulli <antonio@...nvpn.net>
Cc: netdev@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Ralf Lici <ralf@...delbit.com>
Subject: Re: [PATCH net-next 5/8] ovpn: add support for asymmetric peer IDs

2025-11-11, 22:47:38 +0100, Antonio Quartulli wrote:
> From: Ralf Lici <ralf@...delbit.com>
> 
> In order to support the multipeer architecture, upon connection setup
> each side of a tunnel advertises a unique ID that the other side must
> include in packets sent to them. Therefore when transmitting a packet, a
> peer inserts the recipient's advertised ID for that specific tunnel into
> the peer ID field. When receiving a packet, a peer expects to find its
> own unique receive ID for that specific tunnel in the peer ID field.
> 
> Add support for the TX peer ID and embed it into transmitting packets.
> If no TX peer ID is specified, fallback to using the same peer ID both
> for RX and TX in order to be compatible with the non-multipeer compliant
> peers.
> 
> Signed-off-by: Ralf Lici <ralf@...delbit.com>
> Signed-off-by: Antonio Quartulli <antonio@...nvpn.net>
> ---
>  Documentation/netlink/specs/ovpn.yaml | 17 ++++++++++++++++-
>  drivers/net/ovpn/crypto_aead.c        |  2 +-
>  drivers/net/ovpn/netlink-gen.c        | 13 ++++++++++---
>  drivers/net/ovpn/netlink-gen.h        |  6 +++---
>  drivers/net/ovpn/netlink.c            | 14 ++++++++++++--
>  drivers/net/ovpn/peer.c               |  4 ++++
>  drivers/net/ovpn/peer.h               |  4 +++-
>  include/uapi/linux/ovpn.h             |  1 +
>  8 files changed, 50 insertions(+), 11 deletions(-)

The patch looks ok, but shouldn't there be a selftest for this
feature, and a few others in this series (bound device/address, maybe
the RPF patch as well)?

-- 
Sabrina