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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_tcp.h"
#include "tx_thread.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_tcp_client_socket_bind PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function binds the TCP socket structure to a specific TCP */
/* port. */
/* */
/* INPUT */
/* */
/* socket_ptr Pointer to TCP socket */
/* port 16-bit TCP port number */
/* wait_option Suspension option */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_tcp_free_port_find Find free TCP port */
/* _nx_tcp_socket_thread_suspend Suspend thread */
/* tx_mutex_get Obtain protection mutex */
/* tx_mutex_put Release protection mutex */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* 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 */
/* */
/**************************************************************************/
UINT _nx_tcp_client_socket_bind(NX_TCP_SOCKET *socket_ptr, UINT port, ULONG wait_option)
{
TX_INTERRUPT_SAVE_AREA
UINT index;
#ifdef NX_NAT_ENABLE
UINT bound;
#endif /* NX_NAT_ENABLE */
NX_IP *ip_ptr;
NX_TCP_SOCKET *search_ptr;
NX_TCP_SOCKET *end_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_BIND, ip_ptr, socket_ptr, port, wait_option, 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 has already been bound to port or if a socket bind is
already pending from another thread. */
if ((socket_ptr -> nx_tcp_socket_bound_next) ||
(socket_ptr -> nx_tcp_socket_bind_in_progress))
{
/* Release the protection mutex. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return an already bound error code. */
return(NX_ALREADY_BOUND);
}
/* Determine if the port needs to be allocated. */
if (port == NX_ANY_PORT)
{
/* Call the find routine to allocate a TCP port. */
port = NX_SEARCH_PORT_START + (UINT)(NX_RAND() % ((NX_MAX_PORT + 1) - NX_SEARCH_PORT_START));
if (_nx_tcp_free_port_find(ip_ptr, port, &port) != NX_SUCCESS)
{
/* Release the protection mutex. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* There was no free port, return an error code. */
return(NX_NO_FREE_PORTS);
}
}
#ifdef NX_NAT_ENABLE
else
{
/* Check if this IP interface has a NAT service. */
if (ip_ptr -> nx_ip_nat_port_verify)
{
/* Yes, so check the port by NAT handler. If NAT does not use this port, allow NetX to use it. */
bound = (ip_ptr -> nx_ip_nat_port_verify)(ip_ptr, NX_PROTOCOL_TCP, port);
/* Check to see if the port has been used by NAT. */
if (bound == NX_TRUE)
{
/* Release the protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return the port unavailable error. */
return(NX_PORT_UNAVAILABLE);
}
}
}
#endif
/* Save the port number in the TCP socket structure. */
socket_ptr -> nx_tcp_socket_port = 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);
/* Pickup the head of the TCP ports bound list. */
search_ptr = ip_ptr -> nx_ip_tcp_port_table[index];
/* Determine if we need to perform a list search. */
if (search_ptr)
{
/* Walk through the circular list of TCP sockets that are already
bound. */
end_ptr = search_ptr;
do
{
/* Determine if this entry is the same as the requested port. */
if (search_ptr -> nx_tcp_socket_port == port)
{
/* Yes, the port has already been allocated. */
break;
}
/* Move to the next entry in the list. */
search_ptr = search_ptr -> nx_tcp_socket_bound_next;
} while (search_ptr != end_ptr);
}
/* Now determine if the port is available. */
if ((search_ptr == NX_NULL) || (search_ptr -> nx_tcp_socket_port != port))
{
/* Place this TCP socket structure on the list of bound ports. */
/* Disable interrupts. */
TX_DISABLE
/* Determine if the list is NULL. */
if (search_ptr)
{
/* There are already sockets on this list... just add this one
to the end. */
socket_ptr -> nx_tcp_socket_bound_next =
ip_ptr -> nx_ip_tcp_port_table[index];
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 =
socket_ptr;
(ip_ptr -> nx_ip_tcp_port_table[index]) -> nx_tcp_socket_bound_previous = socket_ptr;
}
else
{
/* Nothing is on the TCP port list. Add this TCP socket to an
empty list. */
socket_ptr -> nx_tcp_socket_bound_next = socket_ptr;
socket_ptr -> nx_tcp_socket_bound_previous = socket_ptr;
ip_ptr -> nx_ip_tcp_port_table[index] = socket_ptr;
}
/* Restore interrupts. */
TX_RESTORE
/* Release the mutex protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return success to the caller. */
return(NX_SUCCESS);
}
else if (wait_option)
{
/* Prepare for suspension of this thread. */
/* Increment the suspended thread count. */
search_ptr -> nx_tcp_socket_bind_suspended_count++;
/* Set the socket bind in progress flag (thread pointer). */
socket_ptr -> nx_tcp_socket_bind_in_progress = _tx_thread_current_ptr;
/* Also remember the socket that has bound to the port, since the thread
is going to be suspended on that socket. */
socket_ptr -> nx_tcp_socket_bound_previous = search_ptr;
/* Suspend the thread on this socket's connection attempt. */
_nx_tcp_socket_thread_suspend(&(search_ptr -> nx_tcp_socket_bind_suspension_list), _nx_tcp_client_bind_cleanup, socket_ptr, &(ip_ptr -> nx_ip_protection), wait_option);
/* Return the completion status. */
return(_tx_thread_current_ptr -> tx_thread_suspend_status);
}
else
{
/* Release the IP protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return the port unavailable error. */
return(NX_PORT_UNAVAILABLE);
}
}