tcb.h
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/*
* Copyright (C) 2015-2017 Simon Brummer
*
* 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_tcp TCP
* @ingroup net_gnrc
* @brief RIOT's TCP implementation for the GNRC network stack.
*
* @{
*
* @file
* @brief GNRC TCP transmission control block (TCB)
*
* @author Simon Brummer <simon.brummer@posteo.de>
*/
#ifndef NET_GNRC_TCP_TCB_H
#define NET_GNRC_TCP_TCB_H
#include <stdint.h>
#include "kernel_types.h"
#include "ringbuffer.h"
#include "xtimer.h"
#include "mutex.h"
#include "msg.h"
#include "mbox.h"
#include "net/gnrc/pkt.h"
#include "config.h"
#ifdef MODULE_GNRC_IPV6
#include "net/gnrc/ipv6.h"
#endif
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Size of the TCB mbox
*/
#define GNRC_TCP_TCB_MBOX_SIZE (8U)
/**
* @brief Transmission control block of GNRC TCP.
*/
typedef struct _transmission_control_block {
uint8_t address_family; /**< Address Family of local_addr / peer_addr */
#ifdef MODULE_GNRC_IPV6
uint8_t local_addr[sizeof(ipv6_addr_t)]; /**< Local IP address */
uint8_t peer_addr[sizeof(ipv6_addr_t)]; /**< Peer IP address */
#endif
uint16_t local_port; /**< Local connections port number */
uint16_t peer_port; /**< Peer connections port number */
uint8_t state; /**< Connections state */
uint8_t status; /**< A connections status flags */
uint32_t snd_una; /**< Send unacknowledged */
uint32_t snd_nxt; /**< Send next */
uint16_t snd_wnd; /**< Send window */
uint32_t snd_wl1; /**< SeqNo. from last window update */
uint32_t snd_wl2; /**< AckNo. from last window update */
uint32_t rcv_nxt; /**< Receive next */
uint16_t rcv_wnd; /**< Receive window */
uint32_t iss; /**< Initial sequence sumber */
uint32_t irs; /**< Initial received sequence number */
uint16_t mss; /**< The peers MSS */
uint32_t rtt_start; /**< Timer value for rtt estimation */
int32_t rtt_var; /**< Round trip time variance */
int32_t srtt; /**< Smoothed round trip time */
int32_t rto; /**< Retransmission timeout duration */
uint8_t retries; /**< Number of retransmissions */
xtimer_t tim_tout; /**< Timer struct for timeouts */
msg_t msg_tout; /**< Message, sent on timeouts */
gnrc_pktsnip_t *pkt_retransmit; /**< Pointer to packet in "retransmit queue" */
msg_t mbox_raw[GNRC_TCP_TCB_MBOX_SIZE]; /**< Msg queue for mbox */
mbox_t mbox; /**< TCB mbox for synchronization */
uint8_t *rcv_buf_raw; /**< Pointer to the receive buffer */
ringbuffer_t rcv_buf; /**< Receive buffer data structure */
mutex_t fsm_lock; /**< Mutex for FSM access synchronization */
mutex_t function_lock; /**< Mutex for function call synchronization */
struct _transmission_control_block *next; /**< Pointer next TCB */
} gnrc_tcp_tcb_t;
#ifdef __cplusplus
}
#endif
#endif /* NET_GNRC_TCP_TCB_H */
/** @} */