Re: [PATCH net-next v26 00/23] Introducing OpenVPN Data Channel Offload

[Oleksandr Natalenko <oleksandr@natalenko.name>]

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Hello.

On úterý 15. dubna 2025 13:17:17, středoevropský letní čas Antonio Quartulli wrote:
> Notable changes since v25:
> * removed netdev notifier (was only used for our own devices)
> * added .dellink implementation to address what was previously
>   done in notifier
> * removed .ndo_open and moved netif_carrier_off() call to .ndo_init
> * fixed author in MODULE_AUTHOR()
> * properly indented checks in ovpn.yaml
> * switched from TSTATS to DSTATS
> * removed obsolete comment in ovpn_socket_new()
> * removed unrelated hunk in ovpn_socket_new()
> 
> The latest code can also be found at:
> 
> https://github.com/OpenVPN/ovpn-net-next

Thank you for this. I've backported the submission for my local v6.14-based build (had to adjust for 69c7be1b903fca) and I'm using it now with [1] as you've suggested previously. So far so good. Feel free to add my:

Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>

A couple of notes if I may:

1. is it expected for then tun iface to stay after the connection is brought down? If that matters, I'm using NetworkManager for managing my OpenVPN connections
2. a userspace nit probably not relevant to this submission: the daemon still reports "DCO version:" but with "N/A" value because that version file under /sys is not presented any more like it was with an out-of-tree v2 implementation

[1]: https://github.com/mandelbitdev/openvpn/tree/gianmarco/179-ovpn-support

> 
> Thanks a lot!
> Best Regards,
> 
> Antonio Quartulli
> OpenVPN Inc.
> 
> ---
> Antonio Quartulli (23):
>       net: introduce OpenVPN Data Channel Offload (ovpn)
>       ovpn: add basic netlink support
>       ovpn: add basic interface creation/destruction/management routines
>       ovpn: keep carrier always on for MP interfaces
>       ovpn: introduce the ovpn_peer object
>       ovpn: introduce the ovpn_socket object
>       ovpn: implement basic TX path (UDP)
>       ovpn: implement basic RX path (UDP)
>       ovpn: implement packet processing
>       ovpn: store tunnel and transport statistics
>       ovpn: implement TCP transport
>       skb: implement skb_send_sock_locked_with_flags()
>       ovpn: add support for MSG_NOSIGNAL in tcp_sendmsg
>       ovpn: implement multi-peer support
>       ovpn: implement peer lookup logic
>       ovpn: implement keepalive mechanism
>       ovpn: add support for updating local or remote UDP endpoint
>       ovpn: implement peer add/get/dump/delete via netlink
>       ovpn: implement key add/get/del/swap via netlink
>       ovpn: kill key and notify userspace in case of IV exhaustion
>       ovpn: notify userspace when a peer is deleted
>       ovpn: add basic ethtool support
>       testing/selftests: add test tool and scripts for ovpn module
> 
>  Documentation/netlink/specs/ovpn.yaml              |  367 +++
>  Documentation/netlink/specs/rt-link.yaml           |   16 +
>  MAINTAINERS                                        |   11 +
>  drivers/net/Kconfig                                |   15 +
>  drivers/net/Makefile                               |    1 +
>  drivers/net/ovpn/Makefile                          |   22 +
>  drivers/net/ovpn/bind.c                            |   55 +
>  drivers/net/ovpn/bind.h                            |  101 +
>  drivers/net/ovpn/crypto.c                          |  210 ++
>  drivers/net/ovpn/crypto.h                          |  145 ++
>  drivers/net/ovpn/crypto_aead.c                     |  383 ++++
>  drivers/net/ovpn/crypto_aead.h                     |   29 +
>  drivers/net/ovpn/io.c                              |  446 ++++
>  drivers/net/ovpn/io.h                              |   34 +
>  drivers/net/ovpn/main.c                            |  274 +++
>  drivers/net/ovpn/main.h                            |   14 +
>  drivers/net/ovpn/netlink-gen.c                     |  213 ++
>  drivers/net/ovpn/netlink-gen.h                     |   41 +
>  drivers/net/ovpn/netlink.c                         | 1258 +++++++++++
>  drivers/net/ovpn/netlink.h                         |   18 +
>  drivers/net/ovpn/ovpnpriv.h                        |   55 +
>  drivers/net/ovpn/peer.c                            | 1365 +++++++++++
>  drivers/net/ovpn/peer.h                            |  163 ++
>  drivers/net/ovpn/pktid.c                           |  129 ++
>  drivers/net/ovpn/pktid.h                           |   86 +
>  drivers/net/ovpn/proto.h                           |  118 +
>  drivers/net/ovpn/skb.h                             |   61 +
>  drivers/net/ovpn/socket.c                          |  233 ++
>  drivers/net/ovpn/socket.h                          |   49 +
>  drivers/net/ovpn/stats.c                           |   21 +
>  drivers/net/ovpn/stats.h                           |   47 +
>  drivers/net/ovpn/tcp.c                             |  598 +++++
>  drivers/net/ovpn/tcp.h                             |   36 +
>  drivers/net/ovpn/udp.c                             |  439 ++++
>  drivers/net/ovpn/udp.h                             |   25 +
>  include/linux/skbuff.h                             |    2 +
>  include/uapi/linux/if_link.h                       |   15 +
>  include/uapi/linux/ovpn.h                          |  109 +
>  include/uapi/linux/udp.h                           |    1 +
>  net/core/skbuff.c                                  |   18 +-
>  net/ipv6/af_inet6.c                                |    1 +
>  tools/testing/selftests/Makefile                   |    1 +
>  tools/testing/selftests/net/ovpn/.gitignore        |    2 +
>  tools/testing/selftests/net/ovpn/Makefile          |   31 +
>  tools/testing/selftests/net/ovpn/common.sh         |   92 +
>  tools/testing/selftests/net/ovpn/config            |   10 +
>  tools/testing/selftests/net/ovpn/data64.key        |    5 +
>  tools/testing/selftests/net/ovpn/ovpn-cli.c        | 2376 ++++++++++++++++++++
>  tools/testing/selftests/net/ovpn/tcp_peers.txt     |    5 +
>  .../testing/selftests/net/ovpn/test-chachapoly.sh  |    9 +
>  .../selftests/net/ovpn/test-close-socket-tcp.sh    |    9 +
>  .../selftests/net/ovpn/test-close-socket.sh        |   45 +
>  tools/testing/selftests/net/ovpn/test-float.sh     |    9 +
>  tools/testing/selftests/net/ovpn/test-tcp.sh       |    9 +
>  tools/testing/selftests/net/ovpn/test.sh           |  113 +
>  tools/testing/selftests/net/ovpn/udp_peers.txt     |    5 +
>  56 files changed, 9940 insertions(+), 5 deletions(-)
> ---
> base-commit: 23f09f01b495cc510a19b30b6093fb4cb0284aaf
> change-id: 20241002-b4-ovpn-eeee35c694a2
> 
> Best regards,
> 


-- 
Oleksandr Natalenko, MSE

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