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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_client_socket_unbind PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function unbinds the TCP client socket structure from the */
/* previously bound TCP port. */
/* */
/* INPUT */
/* */
/* socket_ptr Pointer to TCP client socket */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_tcp_client_bind_cleanup Remove and cleanup bind req */
/* _nx_tcp_socket_thread_resume Resume thread suspended on */
/* port */
/* _nx_tcp_socket_block_cleanup Cleanup the socket block */
/* tx_mutex_get Obtain protection mutex */
/* tx_mutex_put Release protection mutex */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/**************************************************************************/
UINT _nx_tcp_client_socket_unbind(NX_TCP_SOCKET *socket_ptr)
{
TX_INTERRUPT_SAVE_AREA
UINT index;
UINT port;
NX_IP *ip_ptr;
NX_TCP_SOCKET *new_socket_ptr;
/* Setup the pointer to the associated IP instance. */
ip_ptr = socket_ptr -> nx_tcp_socket_ip_ptr;
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_TCP_CLIENT_SOCKET_UNBIND, ip_ptr, socket_ptr, 0, 0, NX_TRACE_TCP_EVENTS, 0, 0);
/* Obtain the IP mutex so we can figure out whether or not the port has already
been bound to. */
tx_mutex_get(&(ip_ptr -> nx_ip_protection), TX_WAIT_FOREVER);
/* Determine if the socket is still in the timed wait state. */
if (socket_ptr -> nx_tcp_socket_state == NX_TCP_TIMED_WAIT)
{
/* Cleanup the transmission control block. */
_nx_tcp_socket_block_cleanup(socket_ptr);
}
/* Determine if the socket is still in the closed state. */
if (socket_ptr -> nx_tcp_socket_state != NX_TCP_CLOSED)
{
/* No, release the IP protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return an error code. */
return(NX_NOT_CLOSED);
}
/* Determine if the socket is bound to port. */
if (!socket_ptr -> nx_tcp_socket_bound_next)
{
/* Determine if there is a special condition for the socket not being in
a bound condition... i.e. the socket is in a pending-to-be-bound condition
in a call from a different thread. */
if (socket_ptr -> nx_tcp_socket_bind_in_progress)
{
/* Execute the bind suspension cleanup routine. */
_nx_tcp_client_bind_cleanup(socket_ptr -> nx_tcp_socket_bind_in_progress NX_CLEANUP_ARGUMENT);
/* Release the protection mutex. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return success. */
return(NX_SUCCESS);
}
else
{
/* Release the protection mutex. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return a not bound error code. */
return(NX_NOT_BOUND);
}
}
/* Otherwise, the socket is bound. We need to remove this socket from the
port and check for any other TCP socket bind requests that are queued. */
/* Pickup the port number in the TCP socket structure. */
port = socket_ptr -> nx_tcp_socket_port;
/* Calculate the hash index in the TCP port array of the associated IP instance. */
index = (UINT)((port + (port >> 8)) & NX_TCP_PORT_TABLE_MASK);
/* Disable interrupts while we unlink the current socket. */
TX_DISABLE
/* The socket is off the bound list... we need to check for queued receive packets and
if found they need to be released. */
if (socket_ptr -> nx_tcp_socket_receive_queue_count)
{
/* Remove all packets on the socket's receive queue. */
_nx_tcp_socket_receive_queue_flush(socket_ptr);
}
/* Determine if this is the only socket bound on this port list. */
if (socket_ptr -> nx_tcp_socket_bound_next == socket_ptr)
{
/* Yes, this is the only socket on the port list. */
/* Clear the list head pointer and the next pointer in the socket. */
ip_ptr -> nx_ip_tcp_port_table[index] = NX_NULL;
socket_ptr -> nx_tcp_socket_bound_next = NX_NULL;
}
else
{
/* Relink the neighbors of this TCP socket. */
/* Update the links of the adjacent sockets. */
(socket_ptr -> nx_tcp_socket_bound_next) -> nx_tcp_socket_bound_previous =
socket_ptr -> nx_tcp_socket_bound_previous;
(socket_ptr -> nx_tcp_socket_bound_previous) -> nx_tcp_socket_bound_next =
socket_ptr -> nx_tcp_socket_bound_next;
/* Determine if the head of the port list points to the socket being removed.
If so, we need to move the head pointer. */
if (ip_ptr -> nx_ip_tcp_port_table[index] == socket_ptr)
{
/* Yes, we need to move the port list head pointer. */
ip_ptr -> nx_ip_tcp_port_table[index] = socket_ptr -> nx_tcp_socket_bound_next;
}
/* Clear the next pointer in the socket to indicate it is no longer bound. */
socket_ptr -> nx_tcp_socket_bound_next = NX_NULL;
}
/* Restore interrupts. */
TX_RESTORE
/* Determine if there are any threads suspended on trying to bind to the
same port. */
if (socket_ptr -> nx_tcp_socket_bind_suspension_list)
{
/* Pickup the new socket structure to link to the port list. */
new_socket_ptr = (NX_TCP_SOCKET *)(socket_ptr -> nx_tcp_socket_bind_suspension_list) -> tx_thread_suspend_control_block;
/* Clear the new socket's bind in progress flag. */
new_socket_ptr -> nx_tcp_socket_bind_in_progress = NX_NULL;
/* Inherit the suspension list from the previously bound socket. Decrement the suspension count
early since this thread will be resumed and removed from the list later. */
new_socket_ptr -> nx_tcp_socket_bind_suspension_list =
socket_ptr -> nx_tcp_socket_bind_suspension_list;
new_socket_ptr -> nx_tcp_socket_bind_suspended_count = socket_ptr -> nx_tcp_socket_bind_suspended_count - 1;
/* Clear the original socket's information. */
socket_ptr -> nx_tcp_socket_bind_suspension_list = NX_NULL;
socket_ptr -> nx_tcp_socket_bind_suspended_count = 0;
/* Disable interrupts. */
TX_DISABLE
/* Link the new socket to the bound list. */
if (ip_ptr -> nx_ip_tcp_port_table[index])
{
/* There are already sockets on this list... just add this one
to the end. */
new_socket_ptr -> nx_tcp_socket_bound_next =
ip_ptr -> nx_ip_tcp_port_table[index];
new_socket_ptr -> nx_tcp_socket_bound_previous =
(ip_ptr -> nx_ip_tcp_port_table[index]) -> nx_tcp_socket_bound_previous;
((ip_ptr -> nx_ip_tcp_port_table[index]) -> nx_tcp_socket_bound_previous) -> nx_tcp_socket_bound_next =
new_socket_ptr;
(ip_ptr -> nx_ip_tcp_port_table[index]) -> nx_tcp_socket_bound_previous = new_socket_ptr;
}
else
{
/* Nothing is on the TCP port list. Add this TCP socket to an
empty list. */
new_socket_ptr -> nx_tcp_socket_bound_next = new_socket_ptr;
new_socket_ptr -> nx_tcp_socket_bound_previous = new_socket_ptr;
ip_ptr -> nx_ip_tcp_port_table[index] = new_socket_ptr;
}
/* Restore interrupts. */
TX_RESTORE
/* Resume the thread suspended on the bind call. */
_nx_tcp_socket_thread_resume(&(new_socket_ptr -> nx_tcp_socket_bind_suspension_list), NX_SUCCESS);
}
/* Release the protection mutex. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return success. */
return(NX_SUCCESS);
}
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