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

/* 8.18 TCP, in SYN-SENT state MUST ignore a RST control message.  */

/* Procedure
1. Client connects.
2. Drop the SYN+ACK packet in the driver.
3. Server sends a segment that is carrying an RST and ACK flag.
4. Modify the packet with RST flag.
5. Client ignores the packet.
6. Clean up.Print the resuit. */

#include   "tx_api.h"
#include   "nx_api.h"
#include   "nx_tcp.h"
#include   "nx_ip.h"
#include   "nx_ram_network_driver_test_1500.h"
extern void    test_control_return(UINT status);

#if !defined(NX_DISABLE_IPV4)

#define     DEMO_STACK_SIZE    2048
#define     TEST_INTERFACE     0

/* 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                   syn_ack_counter;
static ULONG                   rst_counter;

/* 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_1500(struct NX_IP_DRIVER_STRUCT *driver_req);
extern void    _nx_ram_network_driver(struct NX_IP_DRIVER_STRUCT *driver_req);
extern UINT    (*advanced_packet_process_callback)(NX_IP *ip_ptr, NX_PACKET *packet_ptr, UINT *operation_ptr, UINT *delay_ptr);
static UINT    my_packet_process_8_18(NX_IP *ip_ptr, NX_PACKET *packet_ptr, UINT *operation_ptr, UINT *delay_ptr);
static void    my_tcp_packet_receive_8_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_8_18_application_define(void *first_unused_memory)
#endif
{
CHAR       *pointer;
UINT       status;

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

    error_counter = 0;
    syn_ack_counter = 0;
    rst_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", 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_1500,
                           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++;
}

/* 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++;

    /* Deal the packet with my routing.  */
    advanced_packet_process_callback = my_packet_process_8_18;

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

    /* Check the client socket state.  */
    if(client_socket.nx_tcp_socket_state != NX_TCP_SYN_SENT)
        error_counter++;

    /* Deal the packet with my routing.  */
    ip_0.nx_ip_tcp_packet_receive = my_tcp_packet_receive_8_18;

    /* Resume the thread ntest_1.  */
    tx_thread_resume(&ntest_1);

    /* Check the client socket state.  */
    if(client_socket.nx_tcp_socket_state != NX_TCP_SYN_SENT)
        error_counter++;

    /* Resume the thread ntest_1.  */
    tx_thread_resume(&ntest_1);

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

    /* 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++;

    /* Check for error.  */
    if(error_counter || (syn_ack_counter != 1) || (rst_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_TCP_HEADER    tcp_header_ptr;

    /* Print out some test information banners.  */
    printf("NetX Test:   TCP Spec 8.18 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, 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_NO_WAIT);

    tx_thread_suspend(&ntest_1);


    /* Set the RST.  */
    tcp_header_ptr.nx_tcp_header_word_3 |= NX_TCP_RST_BIT | NX_TCP_ACK_BIT;

    /* Set the sequence number. */
    tcp_header_ptr.nx_tcp_acknowledgment_number = client_socket.nx_tcp_socket_rx_sequence;
    tcp_header_ptr.nx_tcp_sequence_number       = client_socket.nx_tcp_socket_tx_sequence;

    /* Send RST.  */
    _nx_tcp_packet_send_rst(&server_socket, &tcp_header_ptr);


    /* Suspend the thread ntest_1.  */
    tx_thread_suspend(&ntest_1);

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

    /* Set the port to NULL.  */
    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 UINT    my_packet_process_8_18(NX_IP *ip_ptr, NX_PACKET *packet_ptr, UINT *operation_ptr, UINT *delay_ptr)
{
NX_TCP_HEADER      *tcp_header_ptr;
ULONG              checksum = 0;

#if defined(__PRODUCT_NETXDUO__)
ULONG              *source_ip, *dest_ip;
NX_IPV4_HEADER     *ip_header_ptr;
#elif defined(__PRODUCT_NETX__)
ULONG              source_ip, dest_ip;
NX_IP_HEADER       *ip_header_ptr;
#endif

    if(packet_ptr -> nx_packet_length < 40)
        return NX_TRUE;

    /* Point to TCP HEADER.  */
    tcp_header_ptr = (NX_TCP_HEADER *)((packet_ptr -> nx_packet_prepend_ptr) + 20);
    NX_CHANGE_ULONG_ENDIAN(tcp_header_ptr -> nx_tcp_header_word_3);

    if((tcp_header_ptr -> nx_tcp_header_word_3 & NX_TCP_SYN_BIT) && (tcp_header_ptr -> nx_tcp_header_word_3 & NX_TCP_ACK_BIT))
    {
        NX_CHANGE_ULONG_ENDIAN(tcp_header_ptr -> nx_tcp_sequence_number);
        client_socket.nx_tcp_socket_rx_sequence = tcp_header_ptr -> nx_tcp_sequence_number + 1;
        NX_CHANGE_ULONG_ENDIAN(tcp_header_ptr -> nx_tcp_sequence_number);


        *operation_ptr = NX_RAMDRIVER_OP_DROP;
        
        syn_ack_counter++;

        NX_CHANGE_ULONG_ENDIAN(tcp_header_ptr -> nx_tcp_header_word_3);

    }

    /* Remove the ACK bit in THE rst packet. */
    else if((tcp_header_ptr -> nx_tcp_header_word_3 & NX_TCP_RST_BIT) && (tcp_header_ptr -> nx_tcp_header_word_3 & NX_TCP_ACK_BIT))
    {
#if defined(__PRODUCT_NETXDUO__)

        ip_header_ptr = (NX_IPV4_HEADER*)(packet_ptr -> nx_packet_prepend_ptr);
        packet_ptr -> nx_packet_prepend_ptr += sizeof(NX_IPV4_HEADER);
        packet_ptr -> nx_packet_length -= sizeof(NX_IPV4_HEADER);

#elif defined(__PRODUCT_NETX__)

        ip_header_ptr = (NX_IP_HEADER*)(packet_ptr -> nx_packet_prepend_ptr);
        packet_ptr -> nx_packet_prepend_ptr += sizeof(NX_IP_HEADER);
        packet_ptr -> nx_packet_length -= sizeof(NX_IP_HEADER);

#endif

        tcp_header_ptr -> nx_tcp_header_word_3 &= 0xffc0ffff;
        tcp_header_ptr -> nx_tcp_header_word_3 |= NX_TCP_RST_BIT;

        NX_CHANGE_ULONG_ENDIAN(tcp_header_ptr -> nx_tcp_header_word_3);

        NX_CHANGE_ULONG_ENDIAN(ip_header_ptr -> nx_ip_header_source_ip);
        NX_CHANGE_ULONG_ENDIAN(ip_header_ptr -> nx_ip_header_destination_ip);

        NX_CHANGE_ULONG_ENDIAN(tcp_header_ptr -> nx_tcp_header_word_4);

        tcp_header_ptr -> nx_tcp_header_word_4 &= 0x0000ffff;

        NX_CHANGE_ULONG_ENDIAN(tcp_header_ptr -> nx_tcp_header_word_4);

#if defined(__PRODUCT_NETXDUO__)

        dest_ip = &ip_header_ptr -> nx_ip_header_destination_ip;
        source_ip = &ip_header_ptr -> nx_ip_header_source_ip;
        checksum = _nx_ip_checksum_compute(packet_ptr, NX_PROTOCOL_TCP,
                                           packet_ptr -> nx_packet_length,
                                           source_ip, dest_ip);

        checksum = ~checksum & NX_LOWER_16_MASK;

#elif defined(__PRODUCT_NETX__)

        dest_ip = ip_header_ptr -> nx_ip_header_destination_ip;
        source_ip = ip_header_ptr -> nx_ip_header_source_ip;
        checksum = _nx_tcp_checksum(packet_ptr, source_ip, dest_ip);

#endif

        NX_CHANGE_ULONG_ENDIAN(ip_header_ptr -> nx_ip_header_source_ip);
        NX_CHANGE_ULONG_ENDIAN(ip_header_ptr -> nx_ip_header_destination_ip);

        NX_CHANGE_ULONG_ENDIAN(tcp_header_ptr -> nx_tcp_header_word_4);
        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);

#if defined(__PRODUCT_NETXDUO__)

        packet_ptr -> nx_packet_prepend_ptr -= sizeof(NX_IPV4_HEADER);
        packet_ptr -> nx_packet_length += sizeof(NX_IPV4_HEADER);

#elif defined(__PRODUCT_NETX__)

        packet_ptr -> nx_packet_prepend_ptr -= sizeof(NX_IP_HEADER);
        packet_ptr -> nx_packet_length += sizeof(NX_IP_HEADER);

#endif

        advanced_packet_process_callback = NULL;
    }
    else
        NX_CHANGE_ULONG_ENDIAN(tcp_header_ptr -> nx_tcp_header_word_3);

    return NX_TRUE;
}

static void    my_tcp_packet_receive_8_18(NX_IP *ip_ptr, NX_PACKET *packet_ptr)
{
NX_TCP_HEADER *tcp_header_ptr;

    /* 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_3);

    if((tcp_header_ptr -> nx_tcp_header_word_3 & NX_TCP_RST_BIT) && !(tcp_header_ptr -> nx_tcp_header_word_3 & NX_TCP_ACK_BIT))
    {
        rst_counter ++;

        ip_ptr -> nx_ip_tcp_packet_receive = _nx_tcp_packet_receive;
    }

    NX_CHANGE_ULONG_ENDIAN(tcp_header_ptr ->nx_tcp_header_word_3);

    /* Let server receives the packet.  */
    _nx_tcp_packet_receive(ip_ptr, packet_ptr);
}
#else

#ifdef CTEST
VOID test_application_define(void *first_unused_memory)
#else
void    netx_8_18_application_define(void *first_unused_memory)
#endif
{

    /* Print out test information banner.  */
    printf("NetX Test:   TCP Spec 8.18 Test........................................N/A\n"); 

    test_control_return(3);  
}      
#endif