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Message-ID: <20240304150914.11444-1-antonio@openvpn.net> Date: Mon, 4 Mar 2024 16:08:51 +0100 From: Antonio Quartulli <antonio@...nvpn.net> To: netdev@...r.kernel.org Cc: Jakub Kicinski <kuba@...nel.org>, Sergey Ryazanov <ryazanov.s.a@...il.com>, Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>, Antonio Quartulli <antonio@...nvpn.net> Subject: [PATCH net-next v2 00/22] Introducing OpenVPN Data Channel Offload Hi all! After the comments received last month, I reworked the large patch that I have previously sent and I came up with this patchset hoping to make the review process more human and less cumbersome. Some features are stricly intertwined with each other, therefore I couldn't split everything up to the very last grain of salt, but I did my best to create a reasonable set of features that add up on top of each other. I don't expect the kernel module to work between intermediate patches, therefore it is important that all patches are applied if you want to see something meaningful happening. The following is just the introductory text from v1. It's a useful summary of what this new kernel module represents. As an intereting note, an earlier version of this kernel module is already being used by quite some OpenVPN users out there claiming important improvements in terms of performance. By merging the ovpn kernel module upstream we were hoping to extend cooperation beyond the mere OpenVPN community. =================================================================== `ovpn` is essentialy a device driver that allows creating a virtual network interface to handle the OpenVPN data channel. Any traffic entering the interface is encrypted, encapsulated and sent to the appropriate destination. `ovpn` requires OpenVPN in userspace to run along its side in order to be properly configured and maintained during its life cycle. The `ovpn` interface can be created/destroyed and then configured via Netlink API. Specifically OpenVPN in userspace will: * create the `ovpn` interface * establish the connection with one or more peers * perform TLS handshake and negotiate any protocol parameter * configure the `ovpn` interface with peer data (ip/port, keys, etc.) * handle any subsequent control channel communication I'd like to point out the control channel is fully handles in userspace. The idea is to keep the `ovpn` kernel module as simple as possible and let userspace handle all the non-data (non-fast-path) features. NOTE: some of you may already know `ovpn-dco` the out-of-tree predecessor of `ovpn`. However, be aware that the two are not API compatible and therefore OpenVPN 2.6 will not work with this new `ovpn` module. More adjustments are required. If you want to test the `ovpn` kernel module, for the time being you can use the testing tool `ovpn-cli` available here: https://github.com/OpenVPN/ovpn-dco/tree/master/tests The `ovpn` code can also be built as out-of-tree module and its code is available here https://github.com/OpenVPN/ovpn-dco (currently in the dev branch). For more technical details please refer to the actual patches. Any comment, concern or statement will be appreciated! Thanks a lot!! Best Regards, Antonio Quartulli OpenVPN Inc. ====================== Antonio Quartulli (22): netlink: add NLA_POLICY_MAX_LEN macro net: introduce OpenVPN Data Channel Offload (ovpn) ovpn: add basic netlink support ovpn: add basic interface creation/destruction/management routines ovpn: implement interface creation/destruction via netlink 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 ovpn: implement multi-peer support ovpn: implement peer lookup logic ovpn: implement keepalive mechanism ovpn: add support for updating local UDP endpoint ovpn: add support for peer floating ovpn: implement peer add/dump/delete via netlink ovpn: implement key add/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 MAINTAINERS | 8 + drivers/net/Kconfig | 13 + drivers/net/Makefile | 1 + drivers/net/ovpn/Makefile | 21 + drivers/net/ovpn/bind.c | 60 ++ drivers/net/ovpn/bind.h | 91 +++ drivers/net/ovpn/crypto.c | 154 +++++ drivers/net/ovpn/crypto.h | 144 +++++ drivers/net/ovpn/crypto_aead.c | 366 +++++++++++ drivers/net/ovpn/crypto_aead.h | 27 + drivers/net/ovpn/io.c | 533 ++++++++++++++++ drivers/net/ovpn/io.h | 29 + drivers/net/ovpn/main.c | 280 +++++++++ drivers/net/ovpn/main.h | 38 ++ drivers/net/ovpn/netlink.c | 1045 ++++++++++++++++++++++++++++++++ drivers/net/ovpn/netlink.h | 22 + drivers/net/ovpn/ovpnstruct.h | 58 ++ drivers/net/ovpn/packet.h | 44 ++ drivers/net/ovpn/peer.c | 929 ++++++++++++++++++++++++++++ drivers/net/ovpn/peer.h | 176 ++++++ drivers/net/ovpn/pktid.c | 126 ++++ drivers/net/ovpn/pktid.h | 90 +++ drivers/net/ovpn/proto.h | 101 +++ drivers/net/ovpn/skb.h | 51 ++ drivers/net/ovpn/socket.c | 140 +++++ drivers/net/ovpn/socket.h | 57 ++ drivers/net/ovpn/stats.c | 21 + drivers/net/ovpn/stats.h | 51 ++ drivers/net/ovpn/tcp.c | 474 +++++++++++++++ drivers/net/ovpn/tcp.h | 41 ++ drivers/net/ovpn/udp.c | 355 +++++++++++ drivers/net/ovpn/udp.h | 23 + include/net/netlink.h | 1 + include/uapi/linux/ovpn.h | 174 ++++++ include/uapi/linux/udp.h | 1 + 35 files changed, 5745 insertions(+) create mode 100644 drivers/net/ovpn/Makefile create mode 100644 drivers/net/ovpn/bind.c create mode 100644 drivers/net/ovpn/bind.h create mode 100644 drivers/net/ovpn/crypto.c create mode 100644 drivers/net/ovpn/crypto.h create mode 100644 drivers/net/ovpn/crypto_aead.c create mode 100644 drivers/net/ovpn/crypto_aead.h create mode 100644 drivers/net/ovpn/io.c create mode 100644 drivers/net/ovpn/io.h create mode 100644 drivers/net/ovpn/main.c create mode 100644 drivers/net/ovpn/main.h create mode 100644 drivers/net/ovpn/netlink.c create mode 100644 drivers/net/ovpn/netlink.h create mode 100644 drivers/net/ovpn/ovpnstruct.h create mode 100644 drivers/net/ovpn/packet.h create mode 100644 drivers/net/ovpn/peer.c create mode 100644 drivers/net/ovpn/peer.h create mode 100644 drivers/net/ovpn/pktid.c create mode 100644 drivers/net/ovpn/pktid.h create mode 100644 drivers/net/ovpn/proto.h create mode 100644 drivers/net/ovpn/skb.h create mode 100644 drivers/net/ovpn/socket.c create mode 100644 drivers/net/ovpn/socket.h create mode 100644 drivers/net/ovpn/stats.c create mode 100644 drivers/net/ovpn/stats.h create mode 100644 drivers/net/ovpn/tcp.c create mode 100644 drivers/net/ovpn/tcp.h create mode 100644 drivers/net/ovpn/udp.c create mode 100644 drivers/net/ovpn/udp.h create mode 100644 include/uapi/linux/ovpn.h -- 2.43.0
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