VILLASnode/include/villas/kernel/nl.hpp

/* Netlink related functions.
 *
 * Author: Steffen Vogel <post@steffenvogel.de>
 * SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University
 * SPDX-License-Identifier: Apache-2.0
 */

#pragma once

#include <sys/socket.h>

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