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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_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_packet_receive PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function receives a TCP packet from the TCP/IP driver and add */
/* fake TCP/IP header. Then pass the packet to IP deferred receive */
/* routine. */
/* */
/* INPUT */
/* */
/* socket_ptr Pointer to owning socket */
/* packet_ptr Pointer to packet to process */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* 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 */
/* */
/**************************************************************************/
VOID _nx_tcp_socket_driver_packet_receive(NX_TCP_SOCKET *socket_ptr, NX_PACKET *packet_ptr)
{
NX_IP *ip_ptr;
NX_TCP_HEADER *header_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);
if (packet_ptr == NX_NULL)
{
/* Connection closed. */
if (socket_ptr -> nx_tcp_socket_state == NX_TCP_ESTABLISHED)
{
socket_ptr -> nx_tcp_socket_state = NX_TCP_CLOSE_WAIT;
/* 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);
}
/* 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);
}
}
/* Release the IP internal mutex. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
return;
}
/* Fake TCP and IP header. */
/* Prepend the TCP header to the packet. First, make room for the TCP header. */
packet_ptr -> nx_packet_prepend_ptr = packet_ptr -> nx_packet_prepend_ptr - sizeof(NX_TCP_HEADER);
/* Add the length of the TCP header. */
packet_ptr -> nx_packet_length = packet_ptr -> nx_packet_length + (ULONG)sizeof(NX_TCP_HEADER);
/* Pickup the pointer to the head of the TCP packet. */
/*lint -e{927} -e{826} suppress cast of pointer to pointer, since it is necessary */
header_ptr = (NX_TCP_HEADER *)packet_ptr -> nx_packet_prepend_ptr;
/* Build the output request in the TCP header. */
header_ptr -> nx_tcp_header_word_0 = (((ULONG)(socket_ptr -> nx_tcp_socket_connect_port)) << NX_SHIFT_BY_16) |
(ULONG)socket_ptr -> nx_tcp_socket_port;
NX_CHANGE_ULONG_ENDIAN(header_ptr -> nx_tcp_header_word_0);
header_ptr -> nx_tcp_acknowledgment_number = 0;
header_ptr -> nx_tcp_sequence_number = 0;
header_ptr -> nx_tcp_header_word_3 = NX_TCP_HEADER_SIZE | NX_TCP_ACK_BIT | NX_TCP_PSH_BIT;
NX_CHANGE_ULONG_ENDIAN(header_ptr -> nx_tcp_header_word_3);
header_ptr -> nx_tcp_header_word_4 = 0;
#ifndef NX_DISABLE_IPV4
if (socket_ptr -> nx_tcp_socket_connect_ip.nxd_ip_version == NX_IP_VERSION_V4)
{
_nx_ip_header_add(ip_ptr, packet_ptr, socket_ptr -> nx_tcp_socket_connect_ip.nxd_ip_address.v4,
packet_ptr -> nx_packet_ip_interface -> nx_interface_ip_address,
socket_ptr -> nx_tcp_socket_type_of_service,
socket_ptr -> nx_tcp_socket_time_to_live,
NX_IP_TCP,
socket_ptr -> nx_tcp_socket_fragment_enable);
}
#endif /* !NX_DISABLE_IPV4 */
#ifdef FEATURE_NX_IPV6
if (socket_ptr -> nx_tcp_socket_connect_ip.nxd_ip_version == NX_IP_VERSION_V6)
{
if (_nx_ipv6_header_add(ip_ptr, &packet_ptr,
NX_PROTOCOL_TCP,
packet_ptr -> nx_packet_length,
ip_ptr -> nx_ipv6_hop_limit,
socket_ptr -> nx_tcp_socket_connect_ip.nxd_ip_address.v6,
socket_ptr -> nx_tcp_socket_ipv6_addr -> nxd_ipv6_address,
NX_NULL))
{
/* Release the IP internal mutex. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
return;
}
}
#endif /* FEATURE_NX_IPV6 */
/* Release the IP internal mutex. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
_nx_ip_packet_deferred_receive(ip_ptr, packet_ptr);
}
#endif /* NX_ENABLE_TCPIP_OFFLOAD */
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