NetworkManager/libnm/nm-device-wireguard.c

/*
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA.
 *
 * Copyright 2018 Javier Arteaga <jarteaga@jbeta.is>
 */

#include "nm-default.h"

#include "nm-device-wireguard.h"
#include "nm-object-private.h"

typedef struct {
	GBytes *public_key;
	guint listen_port;
	guint fwmark;
} NMDeviceWireGuardPrivate;

/**
 * NMDeviceWireGuard:
 */
struct _NMDeviceWireGuard {
	NMDevice parent;
};

struct _NMDeviceWireGuardClass {
	NMDeviceClass parent;
};

G_DEFINE_TYPE (NMDeviceWireGuard, nm_device_wireguard, NM_TYPE_DEVICE)

#define NM_DEVICE_WIREGUARD_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), NM_TYPE_DEVICE_WIREGUARD, NMDeviceWireGuardPrivate))

NM_GOBJECT_PROPERTIES_DEFINE_BASE (
	PROP_PUBLIC_KEY,
	PROP_LISTEN_PORT,
	PROP_FWMARK,
);

/**
 * nm_device_wireguard_get_public_key:
 * @device: a #NMDeviceWireGuard
 *
 * Gets the public key for this interface
 *
 * Returns: (transfer none): the #GBytes containing the 32-byte public key
 *
 * Since: 1.14
 **/
GBytes *
nm_device_wireguard_get_public_key (NMDeviceWireGuard *device)
{
	g_return_val_if_fail (NM_IS_DEVICE_WIREGUARD (device), NULL);

	return NM_DEVICE_WIREGUARD_GET_PRIVATE (device)->public_key;
}

/**
 * nm_device_wireguard_get_listen_port:
 * @device: a #NMDeviceWireGuard
 *
 * Gets the local UDP port this interface listens on
 *
 * Returns: UDP listen port
 *
 * Since: 1.14
 **/
guint16
nm_device_wireguard_get_listen_port (NMDeviceWireGuard *device)
{
	g_return_val_if_fail (NM_IS_DEVICE_WIREGUARD (device), 0);

	return NM_DEVICE_WIREGUARD_GET_PRIVATE (device)->listen_port;
}

/**
 * nm_device_wireguard_get_fwmark:
 * @device: a #NMDeviceWireGuard
 *
 * Gets the fwmark (firewall mark) for this interface.
 * It can be used to set routing policy for outgoing encrypted packets.
 * See: ip-rule(8)
 *
 * Returns: 0 if fwmark not in use, 32-bit fwmark value otherwise
 *
 * Since: 1.14
 **/
guint32
nm_device_wireguard_get_fwmark (NMDeviceWireGuard *device)
{
	g_return_val_if_fail (NM_IS_DEVICE_WIREGUARD (device), 0);

	return NM_DEVICE_WIREGUARD_GET_PRIVATE (device)->fwmark;
}

/***********************************************************/

static void
get_property (GObject *object,
              guint prop_id,
              GValue *value,
              GParamSpec *pspec)
{
	NMDeviceWireGuard *device = NM_DEVICE_WIREGUARD (object);

	switch (prop_id) {
	case PROP_PUBLIC_KEY:
		g_value_set_boxed (value, nm_device_wireguard_get_public_key (device));
		break;
	case PROP_LISTEN_PORT:
		g_value_set_uint (value, nm_device_wireguard_get_listen_port (device));
		break;
	case PROP_FWMARK:
		g_value_set_uint (value, nm_device_wireguard_get_fwmark (device));
		break;
	default:
		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
		break;
	}
}

static void
nm_device_wireguard_init (NMDeviceWireGuard *device)
{
}

static void
init_dbus (NMObject *object)
{
	NMDeviceWireGuardPrivate *priv = NM_DEVICE_WIREGUARD_GET_PRIVATE (object);
	const NMPropertiesInfo property_info[] = {
		{ NM_DEVICE_WIREGUARD_PUBLIC_KEY,  &priv->public_key },
		{ NM_DEVICE_WIREGUARD_LISTEN_PORT, &priv->listen_port },
		{ NM_DEVICE_WIREGUARD_FWMARK,      &priv->fwmark },
		{ NULL }
	};

	NM_OBJECT_CLASS (nm_device_wireguard_parent_class)->init_dbus (object);

	_nm_object_register_properties (object,
	                                NM_DBUS_INTERFACE_DEVICE_WIREGUARD,
	                                property_info);
}

static void
finalize (GObject *object)
{
	NMDeviceWireGuardPrivate *priv = NM_DEVICE_WIREGUARD_GET_PRIVATE (object);

	g_bytes_unref (priv->public_key);

	G_OBJECT_CLASS (nm_device_wireguard_parent_class)->finalize (object);
}

static void
nm_device_wireguard_class_init (NMDeviceWireGuardClass *wireguard_class)
{
	GObjectClass *object_class = G_OBJECT_CLASS (wireguard_class);
	NMObjectClass *nm_object_class = NM_OBJECT_CLASS (wireguard_class);

	g_type_class_add_private (wireguard_class, sizeof (NMDeviceWireGuardPrivate));

	object_class->get_property = get_property;
	object_class->finalize = finalize;

	nm_object_class->init_dbus = init_dbus;

	/**
	 * NMDeviceWireGuard:public-key:
	 *
	 * 32-byte public key, derived from the current private key.
	 *
	 * Since: 1.14
	 **/
	obj_properties[PROP_PUBLIC_KEY] =
	    g_param_spec_boxed (NM_DEVICE_WIREGUARD_PUBLIC_KEY, "", "",
	                        G_TYPE_BYTES,
	                        G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);

	/**
	 * NMDeviceWireGuard:listen-port:
	 *
	 * Local UDP listen port.
	 * Set to 0 to allow a random port to be chosen (default).
	 *
	 * Since: 1.14
	 **/
	obj_properties[PROP_LISTEN_PORT] =
	    g_param_spec_uint (NM_DEVICE_WIREGUARD_LISTEN_PORT, "", "",
	                       0, G_MAXUINT16, 0,
	                       G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);

	/**
	 * NMDeviceWireGuard:fwmark:
	 *
	 * Optional firewall mark - see ip-rule(8).
	 * Used when setting routing policy for outgoing encrypted packets.
	 * Set to 0 to disable the mark (default).
	 *
	 * Since: 1.14
	 **/
	obj_properties[PROP_FWMARK] =
	    g_param_spec_uint (NM_DEVICE_WIREGUARD_FWMARK, "", "",
	                       0, G_MAXUINT32, 0,
	                       G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);

	g_object_class_install_properties (object_class, _PROPERTY_ENUMS_LAST, obj_properties);
}