hdr.h

/*
 * Copyright (C) 2015 Freie Universität Berlin
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */

/**
 * @defgroup    net_gnrc_netif_hdr Generic network interface header
 * @ingroup     net_gnrc_netif
 * @{
 *
 * @file
 * @brief       Generic network interface header
 *
 * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
 * @author      Martine Lenders <mlenders@inf.fu-berlin.de>
 */

#ifndef NET_GNRC_NETIF_HDR_H
#define NET_GNRC_NETIF_HDR_H

#include <string.h>
#include <stdint.h>

#include "net/gnrc/pkt.h"
#include "net/gnrc/pktbuf.h"

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @brief   Maximum length of the l2 addresses of the generic interface header
 *          in bytes.
 */
#define GNRC_NETIF_HDR_L2ADDR_MAX_LEN   (8)

/**
 * @brief   Maximum length of the string representatiom of l2 addresses of the
 *          generic interface header in bytes.
 */
#define GNRC_NETIF_HDR_L2ADDR_PRINT_LEN (GNRC_NETIF_HDR_L2ADDR_MAX_LEN * 3)

/**
 * @{
 * @name    Flags for the gnrc_netif_hdr_t
 */
/**
 * @brief   Send packet broadcast.
 *
 * @details Packets with this flag set must be send broadcast.
 *          gnrc_netif_hdr_t::dst_l2addr_len and any appended destination
 *          address must be ignored.
 *          If the link layer does not support broadcast the packet must be
 *          dropped silently.
 */
#define GNRC_NETIF_HDR_FLAGS_BROADCAST  (0x80)

/**
 * @brief   Send packet multicast.
 *
 * @details Packets with this flag set must be send multicast.
 *          gnrc_netif_hdr_t::dst_l2addr_len and any appended destination
 *          address must be ignored.
 *          The context for the multicast address must be derived from the
 *          network layer destination address.
 *          If the link layer does not support multicast it should interpret
 *          this flag the same way it does @ref GNRC_NETIF_HDR_FLAGS_BROADCAST.