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// SPDX-License-Identifier: GPL-2.0
/* OpenVPN data channel offload
*
* Copyright (C) 2020-2025 OpenVPN, Inc.
*
* Author: Antonio Quartulli <antonio@openvpn.net>
* James Yonan <james@openvpn.net>
*/
#include <linux/genetlink.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <net/gro_cells.h>
#include <net/ip.h>
#include <net/rtnetlink.h>
#include <uapi/linux/if_arp.h>
#include "ovpnpriv.h"
#include "main.h"
#include "netlink.h"
#include "io.h"
#include "peer.h"
#include "proto.h"
#include "udp.h"
static int ovpn_net_init(struct net_device *dev)
{
struct ovpn_priv *ovpn = netdev_priv(dev);
return gro_cells_init(&ovpn->gro_cells, dev);
}
static void ovpn_net_uninit(struct net_device *dev)
{
struct ovpn_priv *ovpn = netdev_priv(dev);
gro_cells_destroy(&ovpn->gro_cells);
}
static const struct net_device_ops ovpn_netdev_ops = {
.ndo_init = ovpn_net_init,
.ndo_uninit = ovpn_net_uninit,
.ndo_start_xmit = ovpn_net_xmit,
};
static const struct device_type ovpn_type = {
.name = OVPN_FAMILY_NAME,
};
static const struct nla_policy ovpn_policy[IFLA_OVPN_MAX + 1] = {
[IFLA_OVPN_MODE] = NLA_POLICY_RANGE(NLA_U8, OVPN_MODE_P2P,
OVPN_MODE_MP),
};
/**
* 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 == &ovpn_netdev_ops;
}
static void ovpn_setup(struct net_device *dev)
{
netdev_features_t feat = NETIF_F_SG | NETIF_F_GSO |
NETIF_F_GSO_SOFTWARE | NETIF_F_HIGHDMA;
dev->needs_free_netdev = true;
dev->pcpu_stat_type = NETDEV_PCPU_STAT_DSTATS;
dev->netdev_ops = &ovpn_netdev_ops;
dev->hard_header_len = 0;
dev->addr_len = 0;
dev->mtu = ETH_DATA_LEN - OVPN_HEAD_ROOM;
dev->min_mtu = IPV4_MIN_MTU;
dev->max_mtu = IP_MAX_MTU - OVPN_HEAD_ROOM;
dev->type = ARPHRD_NONE;
dev->flags = IFF_POINTOPOINT | IFF_NOARP;
dev->priv_flags |= IFF_NO_QUEUE;
dev->lltx = true;
dev->features |= feat;
dev->hw_features |= feat;
dev->hw_enc_features |= feat;
dev->needed_headroom = ALIGN(OVPN_HEAD_ROOM, 4);
dev->needed_tailroom = OVPN_MAX_PADDING;
SET_NETDEV_DEVTYPE(dev, &ovpn_type);
}
static int ovpn_newlink(struct net_device *dev,
struct rtnl_newlink_params *params,
struct netlink_ext_ack *extack)
{
struct ovpn_priv *ovpn = netdev_priv(dev);
struct nlattr **data = params->data;
enum ovpn_mode mode = OVPN_MODE_P2P;
if (data && data[IFLA_OVPN_MODE]) {
mode = nla_get_u8(data[IFLA_OVPN_MODE]);
netdev_dbg(dev, "setting device mode: %u\n", mode);
}
ovpn->dev = dev;
ovpn->mode = mode;
spin_lock_init(&ovpn->lock);
/* Set carrier explicitly after registration, this way state is
* clearly defined.
*
* In case of MP interfaces we keep the carrier always on.
*
* Carrier for P2P interfaces is initially off and it is then
* switched on and off when the remote peer is added or deleted.
*/
if (ovpn->mode == OVPN_MODE_MP)
netif_carrier_on(dev);
else
netif_carrier_off(dev);
return register_netdevice(dev);
}
static void ovpn_dellink(struct net_device *dev, struct list_head *head)
{
struct ovpn_priv *ovpn = netdev_priv(dev);
if (ovpn->mode == OVPN_MODE_P2P)
ovpn_peer_release_p2p(ovpn, NULL,
OVPN_DEL_PEER_REASON_TEARDOWN);
unregister_netdevice_queue(dev, head);
}
static int ovpn_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
struct ovpn_priv *ovpn = netdev_priv(dev);
if (nla_put_u8(skb, IFLA_OVPN_MODE, ovpn->mode))
return -EMSGSIZE;
return 0;
}
static struct rtnl_link_ops ovpn_link_ops = {
.kind = "ovpn",
.netns_refund = false,
.priv_size = sizeof(struct ovpn_priv),
.setup = ovpn_setup,
.policy = ovpn_policy,
.maxtype = IFLA_OVPN_MAX,
.newlink = ovpn_newlink,
.dellink = ovpn_dellink,
.fill_info = ovpn_fill_info,
};
static int __init ovpn_init(void)
{
int err = rtnl_link_register(&ovpn_link_ops);
if (err) {
pr_err("ovpn: can't register rtnl link ops: %d\n", err);
return err;
}
err = ovpn_nl_register();
if (err) {
pr_err("ovpn: can't register netlink family: %d\n", err);
goto unreg_rtnl;
}
return 0;
unreg_rtnl:
rtnl_link_unregister(&ovpn_link_ops);
return err;
}
static __exit void ovpn_cleanup(void)
{
ovpn_nl_unregister();
rtnl_link_unregister(&ovpn_link_ops);
rcu_barrier();
}
module_init(ovpn_init);
module_exit(ovpn_cleanup);
MODULE_DESCRIPTION("OpenVPN data channel offload (ovpn)");
MODULE_AUTHOR("Antonio Quartulli <antonio@openvpn.net>");
MODULE_LICENSE("GPL");
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