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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2025-present Eclipse ThreadX Contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Component */
/** */
/** Transmission Control Protocol (TCP) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_tcp.h"
#include "nx_ipv6.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_tcp_socket_state_last_ack PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function processes packets during the LAST ACK state, */
/* which is the state at the end of a passive disconnect, i.e. a */
/* disconnect issued by the other side of the connection. */
/* */
/* INPUT */
/* */
/* socket_ptr Pointer to owning socket */
/* tcp_header_ptr Pointer to packet header */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _nx_tcp_socket_thread_resume Resume suspended thread */
/* _nx_tcp_socket_block_cleanup Cleanup the socket block */
/* */
/* CALLED BY */
/* */
/* _nx_tcp_socket_packet_process Process TCP packet for socket */
/* */
/**************************************************************************/
VOID _nx_tcp_socket_state_last_ack(NX_TCP_SOCKET *socket_ptr, NX_TCP_HEADER *tcp_header_ptr)
{
/* Determine if the incoming message is an ACK message. */
if (tcp_header_ptr -> nx_tcp_header_word_3 & NX_TCP_ACK_BIT)
{
/* If it is proper, finish the disconnect. */
if ((tcp_header_ptr -> nx_tcp_acknowledgment_number == socket_ptr -> nx_tcp_socket_tx_sequence) &&
(tcp_header_ptr -> nx_tcp_sequence_number == socket_ptr -> nx_tcp_socket_rx_sequence))
{
/* Cleanup the transmission control block. */
_nx_tcp_socket_block_cleanup(socket_ptr);
/* Determine if we need to wake a thread suspended on the disconnection. */
if (socket_ptr -> nx_tcp_socket_disconnect_suspended_thread)
{
/* Resume suspended thread. */
_nx_tcp_socket_thread_resume(&(socket_ptr -> nx_tcp_socket_disconnect_suspended_thread), NX_SUCCESS);
}
#ifndef NX_DISABLE_EXTENDED_NOTIFY_SUPPORT
/* Is a disconnect callback registered with the TCP socket? */
if (socket_ptr -> nx_tcp_disconnect_complete_notify)
{
/* Call the application's disconnect_complete callback function. */
(socket_ptr -> nx_tcp_disconnect_complete_notify)(socket_ptr);
}
#endif
}
}
}
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