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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 "nx_packet.h"
#include "tx_thread.h"
#include "nx_ip.h"
#ifdef FEATURE_NX_IPV6
#include "nx_ipv6.h"
#endif /* FEATURE_NX_IPV6 */
#ifdef NX_ENABLE_TCPIP_OFFLOAD
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_tcp_socket_driver_establish PORTABLE C */
/* 6.1.8 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is invoked when a TCP connection is established. */
/* */
/* INPUT */
/* */
/* socket_ptr Pointer to owning socket */
/* interface_ptr Pointer to IP interface */
/* remote_port Pointer to remote UDP port */
/* */
/* OUTPUT */
/* */
/* Status */
/* */
/* CALLS */
/* */
/* tx_mutex_get Obtain protection mutex */
/* tx_mutex_put Release protection mutex */
/* _nx_ip_packet_deferred_receive Defer IP packet receive */
/* */
/* CALLED BY */
/* */
/* Driver */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 08-02-2021 Yuxin Zhou Initial Version 6.1.8 */
/* */
/**************************************************************************/
UINT _nx_tcp_socket_driver_establish(NX_TCP_SOCKET *socket_ptr, NX_INTERFACE *interface_ptr, UINT remote_port)
{
NX_IP *ip_ptr;
NXD_ADDRESS ip_address;
UINT status;
UINT index;
UINT port;
struct NX_TCP_LISTEN_STRUCT *listen_ptr;
/* Setup the IP pointer. */
ip_ptr = socket_ptr -> nx_tcp_socket_ip_ptr;
/* Obtain the IP internal mutex before processing the IP event. */
tx_mutex_get(&(ip_ptr -> nx_ip_protection), TX_WAIT_FOREVER);
/* Check socket state first. */
if ((socket_ptr -> nx_tcp_socket_state != NX_TCP_SYN_SENT) &&
(socket_ptr -> nx_tcp_socket_state != NX_TCP_LISTEN_STATE)&&
(socket_ptr -> nx_tcp_socket_state != NX_TCP_SYN_RECEIVED))
{
/* Just ignore socket not in connecting state. */
/* Release the IP internal mutex. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
return(NX_NOT_SUCCESSFUL);
}
if (socket_ptr -> nx_tcp_socket_client_type == NX_FALSE)
{
if (socket_ptr -> nx_tcp_socket_bound_next)
{
/* TCP socket is connecting on other interface. */
/* Release the IP internal mutex. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
return(NX_NOT_SUCCESSFUL);
}
/* For TCP server socket, the connection is not established yet. */
port = socket_ptr -> nx_tcp_socket_port;
status = interface_ptr -> nx_interface_tcpip_offload_handler(ip_ptr, interface_ptr, socket_ptr,
NX_TCPIP_OFFLOAD_TCP_SERVER_SOCKET_ACCEPT,
NX_NULL, NX_NULL, &ip_address, port,
&remote_port, NX_NO_WAIT);
if (status)
{
/* This should not happen as a connection is pendding. */
/* Release the IP internal mutex. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
return(NX_TCPIP_OFFLOAD_ERROR);
}
/* Setup connection parameters. */
socket_ptr -> nx_tcp_socket_connect_interface = interface_ptr;
/* Save the server port and server IP address. */
socket_ptr -> nx_tcp_socket_connect_ip.nxd_ip_version = ip_address.nxd_ip_version;
#ifndef NX_DISABLE_IPV4
if (ip_address.nxd_ip_version == NX_IP_VERSION_V4)
{
socket_ptr -> nx_tcp_socket_connect_ip.nxd_ip_address.v4 = ip_address.nxd_ip_address.v4;
socket_ptr -> nx_tcp_socket_mss =
(ULONG)((interface_ptr -> nx_interface_ip_mtu_size - sizeof(NX_IPV4_HEADER)) - sizeof(NX_TCP_HEADER));
}
#endif /* !NX_DISABLE_IPV4 */
#ifdef FEATURE_NX_IPV6
if (ip_address.nxd_ip_version == NX_IP_VERSION_V6)
{
COPY_IPV6_ADDRESS(ip_address.nxd_ip_address.v6,
socket_ptr -> nx_tcp_socket_connect_ip.nxd_ip_address.v6);
socket_ptr -> nx_tcp_socket_mss =
(ULONG)((interface_ptr -> nx_interface_ip_mtu_size - sizeof(NX_IPV6_HEADER)) - sizeof(NX_TCP_HEADER));
}
#endif /* FEATURE_NX_IPV6 */
socket_ptr -> nx_tcp_socket_connect_port = remote_port;
/* Find listen callback function. */
listen_ptr = ip_ptr -> nx_ip_tcp_active_listen_requests;
if (listen_ptr)
{
do
{
if (listen_ptr -> nx_tcp_listen_port == port)
{
if (listen_ptr -> nx_tcp_listen_callback)
{
/* Clear the server socket pointer in the listen request. If the
application wishes to honor more server connections on this port,
the application must call relisten with a new server socket
pointer. */
listen_ptr->nx_tcp_listen_socket_ptr = NX_NULL;
/* Call the user's listen callback function. */
(listen_ptr ->nx_tcp_listen_callback)(socket_ptr, listen_ptr -> nx_tcp_listen_port);
break;
}
}
/* Move to the next listen request. */
listen_ptr = listen_ptr -> nx_tcp_listen_next;
} while (listen_ptr != ip_ptr -> nx_ip_tcp_active_listen_requests);
}
/* Calculate the hash index in the TCP port array of the associated IP instance. */
index = (UINT)((port + (port >> 8)) & NX_TCP_PORT_TABLE_MASK);
/* Determine if the list is NULL. */
if (ip_ptr -> nx_ip_tcp_port_table[index])
{
/* 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;
}
}
/* Update socket state. */
socket_ptr -> nx_tcp_socket_state = NX_TCP_ESTABLISHED;
#ifndef NX_DISABLE_EXTENDED_NOTIFY_SUPPORT
/* Is a connection completion callback registered with the TCP socket? */
if (socket_ptr -> nx_tcp_establish_notify)
{
/* Call the application's establish callback function. */
(socket_ptr -> nx_tcp_establish_notify)(socket_ptr);
}
#endif
/* Determine if we need to wake a thread suspended on the connection. */
if (socket_ptr -> nx_tcp_socket_connect_suspended_thread)
{
/* Resume the suspended thread. */
_nx_tcp_socket_thread_resume(&(socket_ptr -> nx_tcp_socket_connect_suspended_thread), NX_SUCCESS);
}
/* Release the IP internal mutex. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
return(NX_SUCCESS);
}
#endif /* NX_ENABLE_TCPIP_OFFLOAD */
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