/***************************************************************************/
/* 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                                            */
/***************************************************************************/

/* 101.18 During slow start, a TCP increments cwnd by at most SMSS bytes for each ACK received that acknowledges new data.  */

/*  Procedure
    1.Connection successfully
    2.When receiving an ACK packet check if CWND <= present_cwnd + SMSS  */

#include    "tx_api.h"
#include    "nx_api.h"
#include    "nx_tcp.h"
extern void    test_control_return(UINT status);

#if !defined(NX_DISABLE_IPV4)

#define    DEMO_STACK_SIZE    2048
#define    MSG "----------abcdefgh20----------ABCDEFGH40----------klmnopqr60----------KLMNOPQR80--------------------"

/* 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 demo application...  */

static ULONG                   error_counter;
static ULONG                   data_packet_counter;
static ULONG                   ack_counter;

/* Save the original cwnd..  */
static ULONG                   congestion_window;

/* 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_101_18(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_101_18_application_define(void *first_unused_memory)
#endif
{
CHAR       *pointer;
UINT       status;

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

    error_counter = 0;
    data_packet_counter = 0;
    ack_counter = 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", 512, 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, 1);
    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;

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

    /* Check ARP enable status.  */
    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++;
}

static void    ntest_0_entry(ULONG thread_input)
{
UINT         status;
NX_PACKET    *my_packet1;
NX_PACKET    *my_packet2;

    /* 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, 300,
                                  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++;

    /* Call connect to send an SYN  */
    status = nx_tcp_client_socket_connect(&client_socket, IP_ADDRESS(1, 2, 3, 5), 12, NX_IP_PERIODIC_RATE);

    if(status)
        error_counter++;

    /* Check whether the ACK packet is received. */
    ip_0.nx_ip_tcp_packet_receive = my_tcp_packet_receive_101_18;

    /* Save the original cwnd.  */
    congestion_window = client_socket.nx_tcp_socket_tx_window_congestion;

    /* Create a tcp packet. */
    status = nx_packet_allocate(&pool_0, &my_packet1, NX_TCP_PACKET, NX_IP_PERIODIC_RATE);
    if(status)
        error_counter++;

    /* Fill in the packet with data.     */
    status = nx_packet_data_append(my_packet1, MSG, 60, &pool_0, NX_IP_PERIODIC_RATE);

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

    status = nx_tcp_socket_send(&client_socket, my_packet1, NX_IP_PERIODIC_RATE);

    if(status)
        error_counter++;

    /* Let the thread sleep for 1 second to wait for the ACK packet. */
    tx_thread_sleep(NX_IP_PERIODIC_RATE);

    congestion_window = client_socket.nx_tcp_socket_tx_window_congestion;

    /* Create the second tcp packet. */
    status = nx_packet_allocate(&pool_0, &my_packet2, NX_TCP_PACKET, NX_IP_PERIODIC_RATE);
     if(status)
        error_counter++;

    /* Fill in the packet with data.     */
    status = nx_packet_data_append(my_packet2, MSG, 55, &pool_0, NX_IP_PERIODIC_RATE);

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

    status = nx_tcp_socket_send(&client_socket, my_packet2, NX_IP_PERIODIC_RATE);

    if(status)
        error_counter++;

    /* Let the thread sleep for 1 second to wait for the ACK packet. */
    tx_thread_sleep(NX_IP_PERIODIC_RATE);


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

    if(status)
        error_counter++;

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

    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) || (data_packet_counter != 2) || (ack_counter != 2))
    {
        printf("ERROR!\n");
        test_control_return(1);
    }
    else
    {
        printf("SUCCESS!\n");
        test_control_return(0);
    }
}

/* Define the test threads.  */

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

    /* Print out test information banner.  */
    printf("NetX Test:   TCP Spec 101.18 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 for error.  */
    if(status)
        error_counter++;

    /* 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, 200,
                                  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++;

    status = nx_tcp_socket_receive(&server_socket, &packet_ptr, NX_IP_PERIODIC_RATE);

    /* Check for error.  */
    if(status != NX_SUCCESS)
        error_counter++;
    else
    {
        /* Check data length and payload */
        if((packet_ptr -> nx_packet_length == 60) && (!memcmp(packet_ptr -> nx_packet_prepend_ptr, MSG, 60)))
            data_packet_counter++;

        /* Release the packet.  */
        nx_packet_release(packet_ptr);
    }

    /* Let the thread sleep for 1 second to wait for the ACK packet. */
    tx_thread_sleep(NX_IP_PERIODIC_RATE);

    status = nx_tcp_socket_receive(&server_socket, &packet_ptr, NX_IP_PERIODIC_RATE);

    /* Check for error.  */
    if(status != NX_SUCCESS)
        error_counter++;
    else
    {
        /* Check data length and payload */
        if((packet_ptr -> nx_packet_length == 55) && (!memcmp(packet_ptr -> nx_packet_prepend_ptr, MSG, 55)))
            data_packet_counter++;

        /* Release the packet.  */
        nx_packet_release(packet_ptr);
    }

    /* Let the thread sleep for 1 second to wait for the ACK packet. */
    tx_thread_sleep(NX_IP_PERIODIC_RATE);

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

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

    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++;
}

static void    my_tcp_packet_receive_101_18(NX_IP *ip_ptr, NX_PACKET *packet_ptr)
{
NX_TCP_HEADER        *tcp_header_ptr;

    tcp_header_ptr = (NX_TCP_HEADER *)packet_ptr -> nx_packet_prepend_ptr;
    NX_CHANGE_ULONG_ENDIAN(tcp_header_ptr -> nx_tcp_header_word_3);

    /* Check if the packet is an ACK packet.  */
    if(tcp_header_ptr -> nx_tcp_header_word_3 & NX_TCP_ACK_BIT)
    {
        ack_counter++;

        /* Check whether the TCP increments cwnd by at most SMSS bytes for each ACK received that cumulatively acknowledges new data. */
        if(client_socket.nx_tcp_socket_tx_window_congestion > (congestion_window + client_socket.nx_tcp_socket_connect_mss))
            error_counter++;
        
        if(ack_counter == 2)
            ip_0.nx_ip_tcp_packet_receive = _nx_tcp_packet_receive;
    }

    NX_CHANGE_ULONG_ENDIAN(tcp_header_ptr -> nx_tcp_header_word_3);

    /* Let server 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_101_18_application_define(void *first_unused_memory)
#endif
{

    /* Print out test information banner.  */
    printf("NetX Test:   TCP Spec 101.18 Test......................................N/A\n"); 

    test_control_return(3);  
}      
#endif