/***************************************************************************/
/* Copyright (c) 2024 Microsoft Corporation                                */
/* Copyright (c) 2026 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                                            */
/***************************************************************************/

/* 2.02 Receiver TCP must check the checksum in any incoming segment, and must not acknowledge in case of an error.  */

/* Procedure
1. Let the client socket and server socket finish "three-way handshake" process.
2. Let the server socket allocate a data segment and send it out .
3. Change the TCP checksum of the data segment.
4. Check if the receiver TCP reply an ACK pakcet.  */

#include   "tx_api.h"
#include   "nx_api.h"
#include   "nx_tcp.h"
#include   "nx_ip.h"

extern void    test_control_return(UINT status);
#if !defined(NX_ENABLE_INTERFACE_CAPABILITY) && !defined(NX_DISABLE_TCP_TX_CHECKSUM) && !defined(NX_DISABLE_TCP_RX_CHECKSUM) && !defined(NX_DISABLE_IPV4)
#define     DEMO_STACK_SIZE    2048

/* Define the ThreadX and NetX object control blocks...  */

static TX_THREAD               ntest_0;
static TX_THREAD               ntest_1;

static NX_PACKET_POOL          pool_0;
static NX_IP                   ip_0;
static NX_IP                   ip_1;
static NX_TCP_SOCKET           client_socket;
static NX_TCP_SOCKET           server_socket;

/* Define the counters used in the test application...  */

static ULONG                   error_counter;
static ULONG                   ack_counter;
static UINT                    data_counter;
static ULONG                   ack_number;

/* Define thread prototypes.  */

static void    ntest_0_entry(ULONG thread_input);
static void    ntest_1_entry(ULONG thread_input);
static void    ntest_1_connect_received(NX_TCP_SOCKET *server_socket, UINT port);
static void    ntest_1_disconnect_received(NX_TCP_SOCKET *server_socket);
extern void    _nx_ram_network_driver(struct NX_IP_DRIVER_STRUCT *driver_req);
static void    my_tcp_packet_receive_2_01(NX_IP *ip_ptr, NX_PACKET *packet_ptr);
static void    my_tcp_packet_receive_2_01_2(NX_IP *ip_ptr, NX_PACKET *packet_ptr);

/* Define what the initial system looks like.  */

#ifdef CTEST
VOID test_application_define(void *first_unused_memory)
#else
void           netx_2_01_application_define(void *first_unused_memory)
#endif
{
CHAR       *pointer;
UINT       status;

    /* Setup the working pointer.  */
    pointer = (CHAR *) first_unused_memory;

    error_counter = 0;
    ack_counter = 0;
    data_counter = 0;
    ack_number = 0;

    /* Create the main thread.  */
    tx_thread_create(&ntest_0, "thread 0", ntest_0_entry, 0,  
                     pointer, DEMO_STACK_SIZE, 
                     4, 4, TX_NO_TIME_SLICE, TX_AUTO_START);

    pointer = pointer + DEMO_STACK_SIZE;

    /* Create the main thread.  */
    tx_thread_create(&ntest_1, "thread 1", ntest_1_entry, 0,  
                     pointer, DEMO_STACK_SIZE, 
                     3, 3, TX_NO_TIME_SLICE, TX_AUTO_START);

    pointer = pointer + DEMO_STACK_SIZE;

    /* Initialize the NetX system.  */
    nx_system_initialize();

    /* Create a packet pool.  */
    status = nx_packet_pool_create(&pool_0, "NetX Main Packet Pool", 256, pointer, 8192);
    pointer = pointer + 8192;

    if(status)
        error_counter++;

    /* Create an IP instance.  */
    status = nx_ip_create(&ip_0, "NetX IP Instance 0", IP_ADDRESS(1, 2, 3, 4), 0xFFFFFF00UL, &pool_0, _nx_ram_network_driver,
                          pointer, 2048, 1);
    pointer = pointer + 2048;

    /* Create another IP instance.  */
    status += nx_ip_create(&ip_1, "NetX IP Instance 1", IP_ADDRESS(1, 2, 3, 5), 0xFFFFFF00UL, &pool_0, _nx_ram_network_driver,
                           pointer, 2048, 2);
    pointer = pointer + 2048;
    if(status)
        error_counter++;

    /* Enable ARP and supply ARP cache memory for IP Instance 0.  */
    status = nx_arp_enable(&ip_0, (void *) pointer, 1024);
    pointer = pointer + 1024;
    if(status)
        error_counter++;

    /* Enable ARP and supply ARP cache memory for IP Instance 1.  */
    status = nx_arp_enable(&ip_1, (void *) pointer, 1024);
    pointer = pointer + 1024;
    if(status)
        error_counter++;

    /* Enable TCP processing for both IP instances.  */
    status = nx_tcp_enable(&ip_0);
    status += nx_tcp_enable(&ip_1);

    /* Check TCP enable status.  */
    if(status)
        error_counter++;
}

/* Define the test threads.  */

static void    ntest_0_entry(ULONG thread_input)
{
UINT       status;

    /* Create a socket.  */
    status = nx_tcp_socket_create(&ip_0, &client_socket, "Client Socket", 
                                  NX_IP_NORMAL, NX_FRAGMENT_OKAY, NX_IP_TIME_TO_LIVE, 200,
                                  NX_NULL, NX_NULL);

    /* Check for error.  */
    if(status)
        error_counter++;

    /* Bind the socket.  */
    status = nx_tcp_client_socket_bind(&client_socket, 12, NX_IP_PERIODIC_RATE);

    /* Check for error.  */
    if(status)
        error_counter++;

    /* Let my function change the checksum.  */
    ip_0.nx_ip_tcp_packet_receive = my_tcp_packet_receive_2_01;

    /* Attempt to connect the socket.  */
    status = nx_tcp_client_socket_connect(&client_socket, IP_ADDRESS(1, 2, 3, 5), 12, 5 * NX_IP_PERIODIC_RATE);

    /* Check for error.  */
    if(status)
        error_counter++;

    /* Disconnect the client socket.  */
    status = nx_tcp_socket_disconnect(&client_socket, NX_IP_PERIODIC_RATE);

    /* Check for error.  */
    if(status)
        error_counter++;

    /* Unbind the socket.  */
    status = nx_tcp_client_socket_unbind(&client_socket);

    /* Check for error.  */
    if(status)
        error_counter++;

    /* Delete the socket.  */
    status = nx_tcp_socket_delete(&client_socket);

    /* Check for error.  */
    if(status)
        error_counter++;

    /* Determine if the test was successful.  */
    if((error_counter) || (ack_counter) || (data_counter != 1))
    {
        printf("ERROR!\n");
        test_control_return(1);
    }
    else
    {
        printf("SUCCESS!\n");
        test_control_return(0);
    }
}

static void    ntest_1_entry(ULONG thread_input)
{
UINT       status;
ULONG      actual_status;
NX_PACKET  *my_packet;

    printf("NetX Test:   TCP Spec 2.01 Test........................................");

    /* Check for earlier error.  */
    if(error_counter)
    {
        printf("ERROR!\n");
        test_control_return(1);
    }

    /* Ensure the IP instance has been initialized.  */
    status = nx_ip_status_check(&ip_1, NX_IP_INITIALIZE_DONE, &actual_status, NX_IP_PERIODIC_RATE);

    /* Check status...  */
    if(status != NX_SUCCESS)
    {
        printf("ERROR!\n");
        test_control_return(1);
    }

    /* Create a socket.  */
    status = nx_tcp_socket_create(&ip_1, &server_socket, "Server Socket", 
                                  NX_IP_NORMAL, NX_FRAGMENT_OKAY, NX_IP_TIME_TO_LIVE, 100,
                                  NX_NULL, ntest_1_disconnect_received);

    /* Check for error.  */
    if(status)
        error_counter++;

    /* Setup this thread to listen.  */
    status = nx_tcp_server_socket_listen(&ip_1, 12, &server_socket, 5, ntest_1_connect_received);

    /* Check for error.  */
    if(status)
        error_counter++;

    /* Accept a client socket connection.  */
    status = nx_tcp_server_socket_accept(&server_socket, NX_IP_PERIODIC_RATE);

    /* Check for error.  */
    if(status)
        error_counter++;

    /* Let my function change the checksum.  */
    ip_1.nx_ip_tcp_packet_receive = my_tcp_packet_receive_2_01_2;

    /* Create a packet.  */
    status = nx_packet_allocate(&pool_0, &my_packet, NX_TCP_PACKET, NX_IP_PERIODIC_RATE);

    /* Check status.  */
    if(status)
        error_counter++;

    /* Fill in the packet with data.  */
    status = nx_packet_data_append(my_packet, "01234567890123456789", 20, &pool_0, NX_IP_PERIODIC_RATE);

    /* Check status.  */
    if(status)
        error_counter++;

    /* Record the tx_sequence.  */
    ack_number = server_socket.nx_tcp_socket_tx_sequence;

    /* Send the packet out!  */
    status = nx_tcp_socket_send(&server_socket, my_packet, NX_IP_PERIODIC_RATE);

    /* Check for error.  */
    if(status)
        error_counter++;

    /* Avoid server resend the packet.  */
    server_socket.nx_tcp_socket_tx_sequence = server_socket.nx_tcp_socket_tx_sequence - 20;

    /* Disconnect the server socket.  */
    status = nx_tcp_socket_disconnect(&server_socket, NX_IP_PERIODIC_RATE);

    /* Check for error.  */
    if (status)
        error_counter++;

    /* Unaccept the server socket.  */
    status = nx_tcp_server_socket_unaccept(&server_socket);

    /* Check for error.  */
    if (status)
        error_counter++;

    /* Unlisten on the server port.  */
    status =  nx_tcp_server_socket_unlisten(&ip_1, 12);

    /* Check for error.  */
    if (status)
        error_counter++;

    /* Delete the socket.  */
    status = nx_tcp_socket_delete(&server_socket);

    /* Check for error.  */
    if(status)
        error_counter++;
}

static void    ntest_1_connect_received(NX_TCP_SOCKET *socket_ptr, UINT port)
{

    /* Check for the proper socket and port.  */
    if((socket_ptr != &server_socket) || (port != 12))
        error_counter++;
}

static void    ntest_1_disconnect_received(NX_TCP_SOCKET *socket)
{

    /* Check for proper disconnected socket.  */
    if(socket != &server_socket)
        error_counter++;

#ifdef __PRODUCT_NETXDUO__
    /* Get nothing the peer socket info.  */
    if (nxd_tcp_socket_peer_info_get(&server_socket, NX_NULL, NX_NULL) == NX_SUCCESS)
        error_counter++;
#endif /* __PRODUCT_NETXDUO__ */
}

void           my_tcp_packet_receive_2_01(NX_IP *ip_ptr, NX_PACKET *packet_ptr)
{
NX_TCP_HEADER   *tcp_header_ptr;
ULONG           checksum;


    /* Change the checksum.  */
    if((packet_ptr -> nx_packet_length - 20 == 20) && (!memcmp(packet_ptr -> nx_packet_prepend_ptr + 20, "01234567890123456789", 20)))
    {
        
        data_counter++;

        /* Point to TCP header  */
        tcp_header_ptr = (NX_TCP_HEADER *)packet_ptr->nx_packet_prepend_ptr;
        NX_CHANGE_ULONG_ENDIAN(tcp_header_ptr -> nx_tcp_header_word_4);

        checksum = tcp_header_ptr ->nx_tcp_header_word_4 >> NX_SHIFT_BY_16;
        checksum += 1;
        tcp_header_ptr -> nx_tcp_header_word_4 = (checksum << NX_SHIFT_BY_16);

        NX_CHANGE_ULONG_ENDIAN(tcp_header_ptr -> nx_tcp_header_word_4); 

        /* Use the default routine.  */
        ip_0.nx_ip_tcp_packet_receive = _nx_tcp_packet_receive;
    }

    /* Let the client socket receive the packet.  */
    _nx_tcp_packet_receive(ip_ptr, packet_ptr);
}

void           my_tcp_packet_receive_2_01_2(NX_IP *ip_ptr, NX_PACKET *packet_ptr)
{
NX_TCP_HEADER               *tcp_header_ptr;

    /* Check whether the client socket reply an ACK packet to the data segment.  */
    if(data_counter == 1)
    {
        tcp_header_ptr = (NX_TCP_HEADER *)packet_ptr -> nx_packet_prepend_ptr;
        NX_CHANGE_ULONG_ENDIAN(tcp_header_ptr -> nx_tcp_header_word_3);

        if((tcp_header_ptr -> nx_tcp_header_word_3 & NX_TCP_ACK_BIT) && (!(tcp_header_ptr -> nx_tcp_header_word_3 & NX_TCP_SYN_BIT))&& (!(tcp_header_ptr -> nx_tcp_header_word_3 & NX_TCP_RST_BIT))&& (!(tcp_header_ptr -> nx_tcp_header_word_3 & NX_TCP_FIN_BIT)))
        {
            /* Get the ack_number.  */
            NX_CHANGE_ULONG_ENDIAN(tcp_header_ptr -> nx_tcp_acknowledgment_number);

            if(tcp_header_ptr -> nx_tcp_acknowledgment_number == (ack_number + 20))
                ack_counter++;

            NX_CHANGE_ULONG_ENDIAN(tcp_header_ptr -> nx_tcp_acknowledgment_number);
        }
        else if((tcp_header_ptr -> nx_tcp_header_word_3 & NX_TCP_FIN_BIT))
        {

            /* Deal packets with default routing.  */
            ip_1.nx_ip_tcp_packet_receive = _nx_tcp_packet_receive;
        }

        NX_CHANGE_ULONG_ENDIAN(tcp_header_ptr -> nx_tcp_header_word_3);
    }

    /* Let the server socket receive the packet.  */
    _nx_tcp_packet_receive(ip_ptr, packet_ptr);
}
#else
#ifdef CTEST
VOID test_application_define(void *first_unused_memory)
#else
void  netx_2_01_application_define(void *first_unused_memory)
#endif
{
    printf("NetX Test:   TCP Spec 2.01 Test........................................N/A\n");
    test_control_return(3);
}
#endif