/** Netlink related functions.
 *
 * @file
 * @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
 * @copyright 2014-2020, Institute for Automation of Complex Power Systems, EONERC
 * @license GNU General Public License (version 3)
 *
 * VILLASnode
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *********************************************************************************/

/** @addtogroup kernel Kernel
 * @{
 */

#pragma once

#include <sys/socket.h>

#include <netlink/netlink.h>
#include <netlink/route/route.h>
#include <netlink/route/link.h>

namespace villas {
namespace kernel {
namespace nl {

/** Get index of outgoing interface for given destination address.
 *
 * @retval >=0 Interface index of outgoing interface.
 * @retval <0 Error. Something went wrong.
 */
int get_egress(struct nl_addr *addr);

/** Lookup routing tables to get the interface on which packets for a certain destination
 *  will leave the system.
 *
 * @param[in] sa The destination address for outgoing packets.
 * @param[out] link The egress interface.
 * @retval 0 Success. Everything went well.
 * @retval <0 Error. Something went wrong.
 */
struct rtnl_link * get_egress_link(struct sockaddr *sa);

/** Get or create global netlink socket. */
struct nl_sock * init();

/** Close and free global netlink socket. */
void shutdown();

} /* namespace nl */
} /* namespace kernel */
} /* namespace villas */

/** @} */