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88 lines
2.4 KiB
C
88 lines
2.4 KiB
C
/*
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* Copyright (C) 2015-2017 Simon Brummer
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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 net_gnrc_tcp TCP
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* @ingroup net_gnrc
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* @brief RIOT's TCP implementation for the GNRC network stack.
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*
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* @{
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*
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* @file
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* @brief TCP finite state maschine declarations.
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*
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* @author Simon Brummer <simon.brummer@posteo.de>
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*/
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#ifndef FSM_H
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#define FSM_H
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#include <stdint.h>
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#include "net/gnrc/pkt.h"
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#include "net/gnrc/tcp/tcb.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 The TCP FSM states.
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*/
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typedef enum {
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FSM_STATE_CLOSED = 0,
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FSM_STATE_LISTEN,
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FSM_STATE_SYN_SENT,
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FSM_STATE_SYN_RCVD,
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FSM_STATE_ESTABLISHED,
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FSM_STATE_CLOSE_WAIT,
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FSM_STATE_LAST_ACK,
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FSM_STATE_FIN_WAIT_1,
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FSM_STATE_FIN_WAIT_2,
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FSM_STATE_CLOSING,
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FSM_STATE_TIME_WAIT
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} fsm_state_t;
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/**
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* @brief Events that trigger transitions in TCP FSM.
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*/
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typedef enum {
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FSM_EVENT_CALL_OPEN, /* User function call: open */
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FSM_EVENT_CALL_SEND, /* User function call: send */
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FSM_EVENT_CALL_RECV, /* User function call: recv */
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FSM_EVENT_CALL_CLOSE, /* User function call: close */
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FSM_EVENT_CALL_ABORT, /* User function call: abort */
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FSM_EVENT_RCVD_PKT, /* Paket received from peer */
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FSM_EVENT_TIMEOUT_TIMEWAIT, /* Timeout: timewait */
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FSM_EVENT_TIMEOUT_RETRANSMIT, /* Timeout: retransmit */
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FSM_EVENT_TIMEOUT_CONNECTION, /* Timeout: connection */
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FSM_EVENT_SEND_PROBE, /* Send zero window probe */
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FSM_EVENT_CLEAR_RETRANSMIT /* Clear retransmission mechanism */
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} fsm_event_t;
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/**
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* @brief TCP finite state maschine
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*
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* @param[in,out] tcb TCB holding the connection information.
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* @param[in] event Current event that triggers FSM transition.
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* @param[in] in_pkt Incomming packet. Only not NULL in case of event RCVD_PKT.
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* @param[in,out] buf Buffer for send and receive functions.
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* @param[in] len Number of bytes to send or receive.
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*
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* @returns Zero on success
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* Positive Number, number of bytes sent from or copied into @p buf.
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* -ENOSYS if event is not implemented
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*/
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int _fsm(gnrc_tcp_tcb_t *tcb, fsm_event_t event, gnrc_pktsnip_t *in_pkt, void *buf, size_t len);
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#ifdef __cplusplus
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}
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#endif
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#endif /* FSM_H */
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/** @} */
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