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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Component */
/** */
/** Transmission Control Protocol (TCP) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_ip.h"
#include "nx_tcp.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_tcp_socket_state_established PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function processes packets during the ESTABLISHED state, */
/* the state of the socket during typical TCP data sending and */
/* receiving. The expected packet that changes state once in the */
/* established state is the FIN packet. Reception of this will move */
/* the state for this socket to the CLOSE WAIT state. */
/* */
/* INPUT */
/* */
/* socket_ptr Pointer to owning socket */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _nx_tcp_packet_send_ack Send ACK message */
/* (nx_tcp_disconnect_callback) Application's callback */
/* function when disconnect */
/* FIN is received */
/* */
/* CALLED BY */
/* */
/* _nx_tcp_socket_packet_process Process TCP packet for socket */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Yuxin Zhou Initial Version 6.0 */
/* 09-30-2020 Yuxin Zhou Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
VOID _nx_tcp_socket_state_established(NX_TCP_SOCKET *socket_ptr)
{
#if !defined(NX_DISABLE_TCP_INFO) || defined(TX_ENABLE_EVENT_TRACE)
NX_IP *ip_ptr;
/* Setup the IP pointer. */
ip_ptr = socket_ptr -> nx_tcp_socket_ip_ptr;
#endif
/* Determine if a FIN has been previously detected in the _nx_tcp_socket_state_data_check
routine and if the socket's sequence number matches the expected FIN sequence number. */
if ((socket_ptr -> nx_tcp_socket_fin_received) &&
(socket_ptr -> nx_tcp_socket_fin_sequence == socket_ptr -> nx_tcp_socket_rx_sequence))
{
#ifndef NX_DISABLE_TCP_INFO
/* Increment the TCP disconnections count. */
ip_ptr -> nx_ip_tcp_disconnections++;
#endif
#ifdef NX_ENABLE_TCP_KEEPALIVE
/* Is the keepalive feature enabled on this socket? */
if (socket_ptr -> nx_tcp_socket_keepalive_enabled)
{
/* Clear the TCP Keepalive timer to disable it for this socket (only needed when
the socket is connected. */
socket_ptr -> nx_tcp_socket_keepalive_timeout = 0;
socket_ptr -> nx_tcp_socket_keepalive_retries = 0;
}
#endif
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_INTERNAL_TCP_STATE_CHANGE, ip_ptr, socket_ptr, socket_ptr -> nx_tcp_socket_state, NX_TCP_CLOSE_WAIT, NX_TRACE_INTERNAL_EVENTS, 0, 0);
/* The FIN bit is set, we need to go into the finished state. */
socket_ptr -> nx_tcp_socket_state = NX_TCP_CLOSE_WAIT;
/* Increment the received sequence. */
socket_ptr -> nx_tcp_socket_rx_sequence++;
/* Loop to release all threads suspended while trying to receive on the socket. */
while (socket_ptr -> nx_tcp_socket_receive_suspension_list)
{
/* Release the head of the receive suspension list. */
_nx_tcp_receive_cleanup(socket_ptr -> nx_tcp_socket_receive_suspension_list NX_CLEANUP_ARGUMENT);
}
/* Send ACK message. */
_nx_tcp_packet_send_ack(socket_ptr, socket_ptr -> nx_tcp_socket_tx_sequence);
/* If given, call the application's disconnect callback function
for disconnect. */
if (socket_ptr -> nx_tcp_disconnect_callback)
{
/* Call the application's disconnect handling function. It is
responsible for calling the socket disconnect function. */
(socket_ptr -> nx_tcp_disconnect_callback)(socket_ptr);
}
}
}