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116 lines
2.9 KiB
C
116 lines
2.9 KiB
C
/*
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* Copyright (C) 2015 Freie Universität Berlin
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @defgroup sys_net_udp UDP
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* @ingroup net
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* @brief RIOT's implementation of the UDP protocol
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*
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* @{
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*
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* @file
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* @brief UDP interface definition
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*
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* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
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*/
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#ifndef NG_UDP_H_
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#define NG_UDP_H_
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#include <stdint.h>
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#include "byteorder.h"
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#include "net/ng_netbase.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Default message queue size for the UDP thread
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*/
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#ifndef NG_UDP_MSG_QUEUE_SIZE
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#define NG_UDP_MSG_QUEUE_SIZE (8U)
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#endif
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/**
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* @brief Priority of the pktdump thread
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*/
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#ifndef NG_UDP_PRIO
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#define NG_UDP_PRIO (THREAD_PRIORITY_MAIN - 2)
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#endif
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/**
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* @brief Default stack size to use for the UDP thread
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*/
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#ifndef NG_UDP_STACK_SIZE
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#define NG_UDP_STACK_SIZE (THREAD_STACKSIZE_DEFAULT)
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#endif
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/**
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* @brief UDP header definition
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*/
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typedef struct __attribute__((packed)) {
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network_uint16_t src_port; /**< source port, in network byte order */
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network_uint16_t dst_port; /**< destination port, network byte order */
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network_uint16_t length; /**< payload length (including the header),
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* network byte order */
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network_uint16_t checksum; /**< checksum */
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} ng_udp_hdr_t;
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/**
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* @brief Calculate the checksum for the given packet
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*
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* @param[in] hdr Pointer to the UDP header
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* @param[in] pseudo_hdr Pointer to the network layer header
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*
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* @return 0 on success
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* @return -EBADMSG if @p pkt is not of type NG_NETTYPE_UDP
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* @return -EFAULT if @p pkt or @p pseudo_hdr is NULL
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* @return -ENOENT if @p pseudo_hdr_type is not known
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*/
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int ng_udp_calc_csum(ng_pktsnip_t *hdr, ng_pktsnip_t *pseudo_hdr);
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/**
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* @brief Allocate and initialize a fresh UDP header in the packet buffer
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*
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* @param[in] payload Payload contained in the UDP packet
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* @param[in] src Source port in host byte order
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* @param[in] src_len Length of @p src, must be 2
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* @param[in] dst Destination port in host byte order
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* @param[in] dst_len Length of @p dst, must be 2
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*
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* @return pointer to the newly created (and allocated) header
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* @return NULL on error
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*/
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ng_pktsnip_t *ng_udp_hdr_build(ng_pktsnip_t *payload,
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uint8_t *src, size_t src_len,
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uint8_t *dst, size_t dst_len);
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/**
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* @brief Print the given UDP header to STDOUT
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*
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* @param[in] hdr UDP header to print
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*/
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void ng_udp_hdr_print(ng_udp_hdr_t *hdr);
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/**
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* @brief Initialize and start UDP
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*
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* @return PID of the UDP thread
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* @return negative value on error
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*/
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int ng_udp_init(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* NG_UDP_H_ */
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/** @} */
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