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/*
* Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
*
* 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 Network interfaces
* @ingroup net_gnrc
* @brief Abstraction layer for GNRC's network interfaces
*
* Network interfaces in the context of GNRC are threads for protocols that are
* below the network layer.
*
* @{
*
* @file
* @brief Definitions for GNRC's network interfaces
*
* @author Martine Lenders <mlenders@inf.fu-berlin.de>
* @author Oliver Hahm <oliver.hahm@inria.fr>
*/
#ifndef GNRC_NETIF_H_
#define GNRC_NETIF_H_
#include <stdlib.h>
#include <stdbool.h>
#include "kernel_types.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Maximum number of network interfaces
*/
#ifndef GNRC_NETIF_NUMOF
#define GNRC_NETIF_NUMOF (1)
#endif
/**
* @brief The add/remove operation to set network layer protocol
* specific options for an interface.
*
* @param[in] pid The PID to the new interface.
*/
typedef void (*gnrc_netif_op_t)(kernel_pid_t pid);
/**
* @brief The add and remove handlers to set network layer protocol
* specific options for an interface.
*
* @details If you implement a pair, please add it to the list in gnrc_netif.c
* statically.
*/
typedef struct {
gnrc_netif_op_t add; /**< The add operation */
gnrc_netif_op_t remove; /**< The remove operation */
} gnrc_netif_handler_t;
/**
* @brief Initializes module.
*/
void gnrc_netif_init(void);
/**
* @brief Adds a thread as interface.
*
* @param[in] pid PID of the added thread.
*
* @return 0, on success,
* @return -ENOMEM, if maximum number of interfaces has been exceeded.
*/
int gnrc_netif_add(kernel_pid_t pid);
/**
* @brief Removes a thread as interface.
*
* @param[in] pid PID of the removed thread.
*/
void gnrc_netif_remove(kernel_pid_t pid);
/**
* @brief Get all active interfaces.
*
* @param[out] netifs List of all active interfaces. There is no order ensured.
* It must at least fit @ref GNRC_NETIF_NUMOF elements.
*
* @return The number of active interfaces.
*/
size_t gnrc_netif_get(kernel_pid_t *netifs);
/**
* @brief Check if an interface exist.
*
* @param[in] pid The PID to be checked.
*
* @return True, if an interface @p pid exists.
* @return False, otherwise
*/
bool gnrc_netif_exist(kernel_pid_t pid);
/**
* @brief Converts a hardware address to a human readable string.
*
* @details The format will be like `xx:xx:xx:xx` where `xx` are the bytes
* of @p addr in hexadecimal representation.
*
* @pre @p out_len >= 3 * @p addr_len
*
* @param[out] out A string to store the output in.
* @param[out] out_len Length of @p out. Must be at least
* 3 * @p addr_len long.
* @param[in] addr A hardware address.
* @param[in] addr_len Length of @p addr.
*
* @return Copy of @p out on success.
* @return NULL, if @p out_len < 3 * @p addr_len.
*/
char *gnrc_netif_addr_to_str(char *out, size_t out_len, const uint8_t *addr,
size_t addr_len);
/**
* @brief Parses a string of colon-separated hexadecimals to a hardware
* address.
*
* @details The input format must be like `xx:xx:xx:xx` where `xx` will be the
* bytes of @p addr in hexadecimal representation.
*
* @param[out] out The resulting hardware address.
* @param[out] out_len Length of @p out.
* @param[in] str A string of colon-separated hexadecimals.
*
* @return Actual length of @p out on success.
* @return 0, on failure.
*/
size_t gnrc_netif_addr_from_str(uint8_t *out, size_t out_len, const char *str);
#ifdef __cplusplus
}
#endif
#endif /* GNRC_NETIF_H_ */
/** @} */
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