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/*
* Copyright (C) 2015 Freie Universitรคt 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_udp UDP
* @ingroup net_gnrc
* @brief GNRC's implementation of the UDP protocol
*
* @{
*
* @file
* @brief UDP GNRC definition
*
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
*/
#ifndef GNRC_UDP_H_
#define GNRC_UDP_H_
#include <stdint.h>
#include "byteorder.h"
#include "net/gnrc.h"
#include "net/udp.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Default message queue size for the UDP thread
*/
#ifndef GNRC_UDP_MSG_QUEUE_SIZE
#define GNRC_UDP_MSG_QUEUE_SIZE (8U)
#endif
/**
* @brief Priority of the UDP thread
*/
#ifndef GNRC_UDP_PRIO
#define GNRC_UDP_PRIO (THREAD_PRIORITY_MAIN - 2)
#endif
/**
* @brief Default stack size to use for the UDP thread
*/
#ifndef GNRC_UDP_STACK_SIZE
#define GNRC_UDP_STACK_SIZE (THREAD_STACKSIZE_DEFAULT)
#endif
/**
* @brief Calculate the checksum for the given packet
*
* @param[in] hdr Pointer to the UDP header
* @param[in] pseudo_hdr Pointer to the network layer header
*
* @return 0 on success
* @return -EBADMSG if @p hdr is not of type GNRC_NETTYPE_UDP
* @return -EFAULT if @p hdr or @p pseudo_hdr is NULL
* @return -ENOENT if gnrc_pktsnip_t::type of @p pseudo_hdr is not known
*/
int gnrc_udp_calc_csum(gnrc_pktsnip_t *hdr, gnrc_pktsnip_t *pseudo_hdr);
/**
* @brief Allocate and initialize a fresh UDP header in the packet buffer
*
* @param[in] payload Payload contained in the UDP packet
* @param[in] src Source port in host byte order
* @param[in] dst Destination port in host byte order
*
* @return pointer to the newly created (and allocated) header
* @return NULL on `src == NULL`, `dst == NULL`, `src_len != 2`, `dst_len != 2`
* or on allocation error
*/
gnrc_pktsnip_t *gnrc_udp_hdr_build(gnrc_pktsnip_t *payload, uint16_t src,
uint16_t dst);
/**
* @brief Initialize and start UDP
*
* @return PID of the UDP thread
* @return negative value on error
*/
int gnrc_udp_init(void);
#ifdef __cplusplus
}
#endif
#endif /* GNRC_UDP_H_ */
/** @} */
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