@@ -16908,6 +16908,14 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/overlayfs/vfs.git
F: Documentation/filesystems/overlayfs.rst
F: fs/overlayfs/
+OPENVPN DATA CHANNEL OFFLOAD
+M: Antonio Quartulli <antonio@openvpn.net>
+L: openvpn-devel@lists.sourceforge.net (moderated for non-subscribers)
+L: netdev@vger.kernel.org
+S: Maintained
+F: drivers/net/ovpn/
+F: include/uapi/linux/ovpn.h
+
P54 WIRELESS DRIVER
M: Christian Lamparter <chunkeey@googlemail.com>
L: linux-wireless@vger.kernel.org
@@ -115,6 +115,19 @@ config WIREGUARD_DEBUG
Say N here unless you know what you're doing.
+config OVPN
+ tristate "OpenVPN data channel offload"
+ depends on NET && INET
+ select NET_UDP_TUNNEL
+ select DST_CACHE
+ select CRYPTO
+ select CRYPTO_AES
+ select CRYPTO_GCM
+ select CRYPTO_CHACHA20POLY1305
+ help
+ This module enhances the performance of the OpenVPN userspace software
+ by offloading the data channel processing to kernelspace.
+
config EQUALIZER
tristate "EQL (serial line load balancing) support"
help
@@ -11,6 +11,7 @@ obj-$(CONFIG_IPVLAN) += ipvlan/
obj-$(CONFIG_IPVTAP) += ipvlan/
obj-$(CONFIG_DUMMY) += dummy.o
obj-$(CONFIG_WIREGUARD) += wireguard/
+obj-$(CONFIG_OVPN) += ovpn/
obj-$(CONFIG_EQUALIZER) += eql.o
obj-$(CONFIG_IFB) += ifb.o
obj-$(CONFIG_MACSEC) += macsec.o
new file mode 100644
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# ovpn -- OpenVPN data channel offload in kernel space
+#
+# Copyright (C) 2020-2024 OpenVPN, Inc.
+#
+# Author: Antonio Quartulli <antonio@openvpn.net>
+
+obj-$(CONFIG_OVPN) := ovpn.o
+ovpn-y += main.o
+ovpn-y += io.o
new file mode 100644
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: GPL-2.0
+/* OpenVPN data channel offload
+ *
+ * Copyright (C) 2019-2024 OpenVPN, Inc.
+ *
+ * Author: James Yonan <james@openvpn.net>
+ * Antonio Quartulli <antonio@openvpn.net>
+ */
+
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+
+#include "io.h"
+
+/* Send user data to the network
+ */
+netdev_tx_t ovpn_net_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ skb_tx_error(skb);
+ kfree_skb(skb);
+ return NET_XMIT_DROP;
+}
new file mode 100644
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* OpenVPN data channel offload
+ *
+ * Copyright (C) 2019-2024 OpenVPN, Inc.
+ *
+ * Author: James Yonan <james@openvpn.net>
+ * Antonio Quartulli <antonio@openvpn.net>
+ */
+
+#ifndef _NET_OVPN_OVPN_H_
+#define _NET_OVPN_OVPN_H_
+
+netdev_tx_t ovpn_net_xmit(struct sk_buff *skb, struct net_device *dev);
+
+#endif /* _NET_OVPN_OVPN_H_ */
new file mode 100644
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0
+/* OpenVPN data channel offload
+ *
+ * Copyright (C) 2020-2024 OpenVPN, Inc.
+ *
+ * Author: Antonio Quartulli <antonio@openvpn.net>
+ * James Yonan <james@openvpn.net>
+ */
+
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/version.h>
+#include <net/rtnetlink.h>
+
+#include "main.h"
+#include "io.h"
+
+/* Driver info */
+#define DRV_DESCRIPTION "OpenVPN data channel offload (ovpn)"
+#define DRV_COPYRIGHT "(C) 2020-2024 OpenVPN, Inc."
+
+/**
+ * ovpn_dev_is_valid - check if the netdevice is of type 'ovpn'
+ * @dev: the interface to check
+ *
+ * Return: whether the netdevice is of type 'ovpn'
+ */
+bool ovpn_dev_is_valid(const struct net_device *dev)
+{
+ return dev->netdev_ops->ndo_start_xmit == ovpn_net_xmit;
+}
+
+/* we register with rtnl to let core know that ovpn is a virtual driver and
+ * therefore ifaces should be destroyed when exiting a netns
+ */
+static struct rtnl_link_ops ovpn_link_ops = {
+};
+
+static int ovpn_netdev_notifier_call(struct notifier_block *nb,
+ unsigned long state, void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+
+ if (!ovpn_dev_is_valid(dev))
+ return NOTIFY_DONE;
+
+ switch (state) {
+ case NETDEV_REGISTER:
+ /* add device to internal list for later destruction upon
+ * unregistration
+ */
+ break;
+ case NETDEV_UNREGISTER:
+ /* can be delivered multiple times, so check registered flag,
+ * then destroy the interface
+ */
+ break;
+ case NETDEV_POST_INIT:
+ case NETDEV_GOING_DOWN:
+ case NETDEV_DOWN:
+ case NETDEV_UP:
+ case NETDEV_PRE_UP:
+ default:
+ return NOTIFY_DONE;
+ }
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block ovpn_netdev_notifier = {
+ .notifier_call = ovpn_netdev_notifier_call,
+};
+
+static int __init ovpn_init(void)
+{
+ int err = register_netdevice_notifier(&ovpn_netdev_notifier);
+
+ if (err) {
+ pr_err("ovpn: can't register netdevice notifier: %d\n", err);
+ return err;
+ }
+
+ err = rtnl_link_register(&ovpn_link_ops);
+ if (err) {
+ pr_err("ovpn: can't register rtnl link ops: %d\n", err);
+ goto unreg_netdev;
+ }
+
+ return 0;
+
+unreg_netdev:
+ unregister_netdevice_notifier(&ovpn_netdev_notifier);
+ return err;
+}
+
+static __exit void ovpn_cleanup(void)
+{
+ rtnl_link_unregister(&ovpn_link_ops);
+ unregister_netdevice_notifier(&ovpn_netdev_notifier);
+
+ rcu_barrier();
+}
+
+module_init(ovpn_init);
+module_exit(ovpn_cleanup);
+
+MODULE_DESCRIPTION(DRV_DESCRIPTION);
+MODULE_AUTHOR(DRV_COPYRIGHT);
+MODULE_LICENSE("GPL");
new file mode 100644
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* OpenVPN data channel offload
+ *
+ * Copyright (C) 2019-2024 OpenVPN, Inc.
+ *
+ * Author: James Yonan <james@openvpn.net>
+ * Antonio Quartulli <antonio@openvpn.net>
+ */
+
+#ifndef _NET_OVPN_MAIN_H_
+#define _NET_OVPN_MAIN_H_
+
+bool ovpn_dev_is_valid(const struct net_device *dev);
+
+#endif /* _NET_OVPN_MAIN_H_ */
@@ -43,5 +43,6 @@ struct udphdr {
#define UDP_ENCAP_GTP1U 5 /* 3GPP TS 29.060 */
#define UDP_ENCAP_RXRPC 6
#define TCP_ENCAP_ESPINTCP 7 /* Yikes, this is really xfrm encap types. */
+#define UDP_ENCAP_OVPNINUDP 8 /* OpenVPN traffic */
#endif /* _UAPI_LINUX_UDP_H */
OpenVPN is a userspace software existing since around 2005 that allows users to create secure tunnels. So far OpenVPN has implemented all operations in userspace, which implies several back and forth between kernel and user land in order to process packets (encapsulate/decapsulate, encrypt/decrypt, rerouting..). With `ovpn` we intend to move the fast path (data channel) entirely in kernel space and thus improve user measured throughput over the tunnel. `ovpn` is implemented as a simple virtual network device driver, that can be manipulated by means of the standard RTNL APIs. A device of kind `ovpn` allows only IPv4/6 traffic and can be of type: * P2P (peer-to-peer): any packet sent over the interface will be encapsulated and transmitted to the other side (typical OpenVPN client or peer-to-peer behaviour); * P2MP (point-to-multipoint): packets sent over the interface are transmitted to peers based on existing routes (typical OpenVPN server behaviour). After the interface has been created, OpenVPN in userspace can configure it using a new Netlink API. Specifically it is possible to manage peers and their keys. The OpenVPN control channel is multiplexed over the same transport socket by means of OP codes. Anything that is not DATA_V2 (OpenVPN OP code for data traffic) is sent to userspace and handled there. This way the `ovpn` codebase is kept as compact as possible while focusing on handling data traffic only (fast path). Any OpenVPN control feature (like cipher negotiation, TLS handshake, rekeying, etc.) is still fully handled by the userspace process. When userspace establishes a new connection with a peer, it first performs the handshake and then passes the socket to the `ovpn` kernel module, which takes ownership. From this moment on `ovpn` will handle data traffic for the new peer. When control packets are received on the link, they are forwarded to userspace through the same transport socket they were received on, as userspace is still listening to them. Some events (like peer deletion) are sent to a Netlink multicast group. Although it wasn't easy to convince the community, `ovpn` implements only a limited number of the data-channel features supported by the userspace program. Each feature that made it to `ovpn` was attentively vetted to avoid carrying too much legacy along with us (and to give a clear cut to old and probalby-not-so-useful features). Notably, only encryption using AEAD ciphers (specifically ChaCha20Poly1305 and AES-GCM) was implemented. Supporting any other cipher out there was not deemed useful. Both UDP and TCP sockets ae supported. As explained above, in case of P2MP mode, OpenVPN will use the main system routing table to decide which packet goes to which peer. This implies that no routing table was re-implemented in the `ovpn` kernel module. This kernel module can be enabled by selecting the CONFIG_OVPN entry in the networking drivers section. NOTE: this first patch introduces the very basic framework only. Features are then added patch by patch, however, although each patch will compile and possibly not break at runtime, only after having applied the full set it is expected to see the ovpn module fully working. Signed-off-by: Antonio Quartulli <antonio@openvpn.net> --- MAINTAINERS | 8 +++ drivers/net/Kconfig | 13 +++++ drivers/net/Makefile | 1 + drivers/net/ovpn/Makefile | 11 ++++ drivers/net/ovpn/io.c | 22 ++++++++ drivers/net/ovpn/io.h | 15 ++++++ drivers/net/ovpn/main.c | 109 ++++++++++++++++++++++++++++++++++++++ drivers/net/ovpn/main.h | 15 ++++++ include/uapi/linux/udp.h | 1 + 9 files changed, 195 insertions(+) create mode 100644 drivers/net/ovpn/Makefile 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