/*
 * FreeRTOS+TCP V2.3.3
 * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * http://aws.amazon.com/freertos
 * http://www.FreeRTOS.org
 */

#ifndef FREERTOS_IP_H
    #define FREERTOS_IP_H

    #ifdef __cplusplus
        extern "C" {
    #endif

    #include "FreeRTOS.h"
    #include "task.h"

/* Application level configuration options. */
    #include "FreeRTOSIPConfig.h"
    #include "FreeRTOSIPConfigDefaults.h"
    #include "IPTraceMacroDefaults.h"

/* Constants defining the current version of the FreeRTOS+TCP
 * network stack. */
    #define ipFR_TCP_VERSION_NUMBER    "V2.3.3"
    #define ipFR_TCP_VERSION_MAJOR     2
    #define ipFR_TCP_VERSION_MINOR     3
    #define ipFR_TCP_VERSION_BUILD     3

/* Some constants defining the sizes of several parts of a packet.
 * These defines come before including the configuration header files. */

/* The size of the Ethernet header is 14, meaning that 802.1Q VLAN tags
 * are not ( yet ) supported. */
    #define ipSIZE_OF_ETH_HEADER      14U
    #define ipSIZE_OF_IPv4_HEADER     20U
    #define ipSIZE_OF_IGMP_HEADER     8U
    #define ipSIZE_OF_ICMP_HEADER     8U
    #define ipSIZE_OF_UDP_HEADER      8U
    #define ipSIZE_OF_TCP_HEADER      20U

    #define ipSIZE_OF_IPv4_ADDRESS    4U

/*
 * Generate a randomized TCP Initial Sequence Number per RFC.
 * This function must be provided by the application builder.
 */
/* This function is defined generally by the application. */
    extern uint32_t ulApplicationGetNextSequenceNumber( uint32_t ulSourceAddress,
                                                        uint16_t usSourcePort,
                                                        uint32_t ulDestinationAddress,
                                                        uint16_t usDestinationPort );

/* The number of octets in the MAC and IP addresses respectively. */
    #define ipMAC_ADDRESS_LENGTH_BYTES                 ( 6 )
    #define ipIP_ADDRESS_LENGTH_BYTES                  ( 4 )

/* IP protocol definitions. */
    #define ipPROTOCOL_ICMP                            ( 1U )
    #define ipPROTOCOL_IGMP                            ( 2U )
    #define ipPROTOCOL_TCP                             ( 6U )
    #define ipPROTOCOL_UDP                             ( 17U )

/* The character used to fill ICMP echo requests, and therefore also the
 * character expected to fill ICMP echo replies. */
    #define ipECHO_DATA_FILL_BYTE                      'x'

/* Dimensions the buffers that are filled by received Ethernet frames. */
    #define ipSIZE_OF_ETH_CRC_BYTES                    ( 4UL )
    #define ipSIZE_OF_ETH_OPTIONAL_802_1Q_TAG_BYTES    ( 4UL )
    #define ipTOTAL_ETHERNET_FRAME_SIZE                ( ( ( uint32_t ) ipconfigNETWORK_MTU ) + ( ( uint32_t ) ipSIZE_OF_ETH_HEADER ) + ipSIZE_OF_ETH_CRC_BYTES + ipSIZE_OF_ETH_OPTIONAL_802_1Q_TAG_BYTES )


/* Space left at the beginning of a network buffer storage area to store a
 * pointer back to the network buffer.  Should be a multiple of 8 to ensure 8 byte
 * alignment is maintained on architectures that require it.
 *
 * In order to get a 32-bit alignment of network packets, an offset of 2 bytes
 * would be desirable, as defined by ipconfigPACKET_FILLER_SIZE.  So the malloc'd
 * buffer will have the following contents:
 *  uint32_t pointer;   // word-aligned
 *  uchar_8 filler[6];
 *  << ETH-header >>    // half-word-aligned
 *  uchar_8 dest[6];    // start of pucEthernetBuffer
 *  uchar_8 dest[6];
 *  uchar16_t type;
 *  << IP-header >>     // word-aligned
 *  uint8_t ucVersionHeaderLength;
 *  etc
 */

    #if ( ipconfigBUFFER_PADDING != 0 )
        #define ipBUFFER_PADDING    ipconfigBUFFER_PADDING
    #else
        #define ipBUFFER_PADDING    ( 8U + ipconfigPACKET_FILLER_SIZE )
    #endif

/**
 * The structure used to store buffers and pass them around the network stack.
 * Buffers can be in use by the stack, in use by the network interface hardware
 * driver, or free (not in use).
 */
    typedef struct xNETWORK_BUFFER
    {
        ListItem_t xBufferListItem;                /**< Used to reference the buffer form the free buffer list or a socket. */
        uint32_t ulIPAddress;                      /**< Source or destination IP address, depending on usage scenario. */
        uint8_t * pucEthernetBuffer;               /**< Pointer to the start of the Ethernet frame. */
        size_t xDataLength;                        /**< Starts by holding the total Ethernet frame length, then the UDP/TCP payload length. */
        uint16_t usPort;                           /**< Source or destination port, depending on usage scenario. */
        uint16_t usBoundPort;                      /**< The port to which a transmitting socket is bound. */
        #if ( ipconfigUSE_LINKED_RX_MESSAGES != 0 )
            struct xNETWORK_BUFFER * pxNextBuffer; /**< Possible optimisation for expert users - requires network driver support. */
        #endif
    } NetworkBufferDescriptor_t;

    #include "pack_struct_start.h"

/**
 * MAC address structure.
 */
    struct xMAC_ADDRESS
    {
        uint8_t ucBytes[ ipMAC_ADDRESS_LENGTH_BYTES ]; /**< Byte array of the MAC address */
    }
    #include "pack_struct_end.h"

    typedef struct xMAC_ADDRESS MACAddress_t;

    typedef enum eNETWORK_EVENTS
    {
        eNetworkUp,  /* The network is configured. */
        eNetworkDown /* The network connection has been lost. */
    } eIPCallbackEvent_t;

/* MISRA check: some modules refer to this typedef even though
 * ipconfigSUPPORT_OUTGOING_PINGS is not enabled. */
    typedef enum ePING_REPLY_STATUS
    {
        eSuccess = 0,     /**< A correct reply has been received for an outgoing ping. */
        eInvalidChecksum, /**< A reply was received for an outgoing ping but the checksum of the reply was incorrect. */
        eInvalidData      /**< A reply was received to an outgoing ping but the payload of the reply was not correct. */
    } ePingReplyStatus_t;

/**
 * The software timer struct for various IP functions
 */
    typedef struct xIP_TIMER
    {
        uint32_t
            bActive : 1,            /**< This timer is running and must be processed. */
            bExpired : 1;           /**< Timer has expired and a task must be processed. */
        TimeOut_t xTimeOut;         /**< The timeout value. */
        TickType_t ulRemainingTime; /**< The amount of time remaining. */
        TickType_t ulReloadTime;    /**< The value of reload time. */
    } IPTimer_t;


/* Endian related definitions. */
    #if ( ipconfigBYTE_ORDER == pdFREERTOS_LITTLE_ENDIAN )

/* FreeRTOS_htons / FreeRTOS_htonl: some platforms might have built-in versions
 * using a single instruction so allow these versions to be overridden. */
        #ifndef FreeRTOS_htons
            #define FreeRTOS_htons( usIn )    ( ( uint16_t ) ( ( ( usIn ) << 8U ) | ( ( usIn ) >> 8U ) ) )
        #endif

        #ifndef FreeRTOS_htonl
            #define FreeRTOS_htonl( ulIn )                          \
    (                                                               \
        ( uint32_t )                                                \
        (                                                           \
            ( ( ( ( uint32_t ) ( ulIn ) ) ) << 24 ) |               \
            ( ( ( ( uint32_t ) ( ulIn ) ) & 0x0000ff00UL ) << 8 ) | \
            ( ( ( ( uint32_t ) ( ulIn ) ) & 0x00ff0000UL ) >> 8 ) | \
            ( ( ( ( uint32_t ) ( ulIn ) ) ) >> 24 )                 \
        )                                                           \
    )
        #endif /* ifndef FreeRTOS_htonl */

    #else /* ipconfigBYTE_ORDER */

        #define FreeRTOS_htons( x )    ( ( uint16_t ) ( x ) )
        #define FreeRTOS_htonl( x )    ( ( uint32_t ) ( x ) )

    #endif /* ipconfigBYTE_ORDER == pdFREERTOS_LITTLE_ENDIAN */

    #define FreeRTOS_ntohs( x )    FreeRTOS_htons( x )
    #define FreeRTOS_ntohl( x )    FreeRTOS_htonl( x )

    int32_t FreeRTOS_max_int32( int32_t a,
                                int32_t b );
    uint32_t FreeRTOS_max_uint32( uint32_t a,
                                  uint32_t b );
    int32_t FreeRTOS_min_int32( int32_t a,
                                int32_t b );
    uint32_t FreeRTOS_min_uint32( uint32_t a,
                                  uint32_t b );
    uint32_t FreeRTOS_round_up( uint32_t a,
                                uint32_t d );
    uint32_t FreeRTOS_round_down( uint32_t a,
                                  uint32_t d );

    #define ipMS_TO_MIN_TICKS( xTimeInMs )    ( ( pdMS_TO_TICKS( ( xTimeInMs ) ) < ( ( TickType_t ) 1U ) ) ? ( ( TickType_t ) 1U ) : pdMS_TO_TICKS( ( xTimeInMs ) ) )

/* For backward compatibility. */
    #define pdMS_TO_MIN_TICKS( xTimeInMs )    ipMS_TO_MIN_TICKS( xTimeInMs )

    #ifndef pdTRUE_SIGNED
        /* Temporary solution: eventually the defines below will appear in 'Source\include\projdefs.h' */
        #define pdTRUE_SIGNED       pdTRUE
        #define pdFALSE_SIGNED      pdFALSE
        #define pdTRUE_UNSIGNED     ( 1U )
        #define pdFALSE_UNSIGNED    ( 0U )
        #define ipTRUE_BOOL         ( 1 == 1 )
        #define ipFALSE_BOOL        ( 1 == 2 )
    #endif

/*
 * FULL, UP-TO-DATE AND MAINTAINED REFERENCE DOCUMENTATION FOR ALL THESE
 * FUNCTIONS IS AVAILABLE ON THE FOLLOWING URL:
 * http://www.FreeRTOS.org/FreeRTOS-Plus/FreeRTOS_Plus_TCP/FreeRTOS_TCP_API_Functions.html
 */
    BaseType_t FreeRTOS_IPInit( const uint8_t ucIPAddress[ ipIP_ADDRESS_LENGTH_BYTES ],
                                const uint8_t ucNetMask[ ipIP_ADDRESS_LENGTH_BYTES ],
                                const uint8_t ucGatewayAddress[ ipIP_ADDRESS_LENGTH_BYTES ],
                                const uint8_t ucDNSServerAddress[ ipIP_ADDRESS_LENGTH_BYTES ],
                                const uint8_t ucMACAddress[ ipMAC_ADDRESS_LENGTH_BYTES ] );

    TaskHandle_t FreeRTOS_GetIPTaskHandle( void );

    void * FreeRTOS_GetUDPPayloadBuffer( size_t uxRequestedSizeBytes,
                                         TickType_t uxBlockTimeTicks );
    void FreeRTOS_GetAddressConfiguration( uint32_t * pulIPAddress,
                                           uint32_t * pulNetMask,
                                           uint32_t * pulGatewayAddress,
                                           uint32_t * pulDNSServerAddress );

    void FreeRTOS_SetAddressConfiguration( const uint32_t * pulIPAddress,
                                           const uint32_t * pulNetMask,
                                           const uint32_t * pulGatewayAddress,
                                           const uint32_t * pulDNSServerAddress );

/* MISRA defining 'FreeRTOS_SendPingRequest' should be dependent on 'ipconfigSUPPORT_OUTGOING_PINGS'.
 * In order not to break some existing project, define it unconditionally. */
    BaseType_t FreeRTOS_SendPingRequest( uint32_t ulIPAddress,
                                         size_t uxNumberOfBytesToSend,
                                         TickType_t uxBlockTimeTicks );

    void FreeRTOS_ReleaseUDPPayloadBuffer( void const * pvBuffer );
    const uint8_t * FreeRTOS_GetMACAddress( void );
    void FreeRTOS_UpdateMACAddress( const uint8_t ucMACAddress[ ipMAC_ADDRESS_LENGTH_BYTES ] );
    #if ( ipconfigUSE_NETWORK_EVENT_HOOK == 1 )
        /* This function shall be defined by the application. */
        void vApplicationIPNetworkEventHook( eIPCallbackEvent_t eNetworkEvent );
    #endif
    #if ( ipconfigSUPPORT_OUTGOING_PINGS == 1 )
        void vApplicationPingReplyHook( ePingReplyStatus_t eStatus,
                                        uint16_t usIdentifier );
    #endif
    uint32_t FreeRTOS_GetIPAddress( void );
    void FreeRTOS_SetIPAddress( uint32_t ulIPAddress );
    void FreeRTOS_SetNetmask( uint32_t ulNetmask );
    void FreeRTOS_SetGatewayAddress( uint32_t ulGatewayAddress );
    uint32_t FreeRTOS_GetGatewayAddress( void );
    uint32_t FreeRTOS_GetDNSServerAddress( void );
    uint32_t FreeRTOS_GetNetmask( void );
    BaseType_t xARPWaitResolution( uint32_t ulIPAddress,
                                   TickType_t uxTicksToWait );
    void FreeRTOS_OutputARPRequest( uint32_t ulIPAddress );
    BaseType_t FreeRTOS_IsNetworkUp( void );

    #if ( ipconfigCHECK_IP_QUEUE_SPACE != 0 )
        UBaseType_t uxGetMinimumIPQueueSpace( void );
    #endif

    #if ( ipconfigHAS_PRINTF != 0 )
        extern void vPrintResourceStats( void );
    #else
        #define vPrintResourceStats()    do {} while( ipFALSE_BOOL )
    #endif

/*
 * Defined in FreeRTOS_Sockets.c
 * //_RB_ Don't think this comment is correct.  If this is for internal use only it should appear after all the public API functions and not start with FreeRTOS_.
 * Socket has had activity, reset the timer so it will not be closed
 * because of inactivity
 */
    #if ( ( ipconfigHAS_DEBUG_PRINTF != 0 ) || ( ipconfigHAS_PRINTF != 0 ) )
        const char * FreeRTOS_GetTCPStateName( UBaseType_t ulState );
    #endif

/* _HT_ Temporary: show all valid ARP entries
 */
    #if ( ipconfigHAS_PRINTF != 0 ) || ( ipconfigHAS_DEBUG_PRINTF != 0 )
        void FreeRTOS_PrintARPCache( void );
    #endif

    void FreeRTOS_ClearARP( void );

/* Return pdTRUE if the IPv4 address is a multicast address. */
    BaseType_t xIsIPv4Multicast( uint32_t ulIPAddress );

/* Set the MAC-address that belongs to a given IPv4 multi-cast address. */
    void vSetMultiCastIPv4MacAddress( uint32_t ulIPAddress,
                                      MACAddress_t * pxMACAddress );

    #if ( ipconfigDHCP_REGISTER_HOSTNAME == 1 )

/* DHCP has an option for clients to register their hostname.  It doesn't
 * have much use, except that a device can be found in a router along with its
 * name. If this option is used the callback below must be provided by the
 * application writer to return a const string, denoting the device's name. */
/* Typically this function is defined in a user module. */
        const char * pcApplicationHostnameHook( void );

    #endif /* ipconfigDHCP_REGISTER_HOSTNAME */


/* This xApplicationGetRandomNumber() will set *pulNumber to a random number,
 * and return pdTRUE. When the random number generator is broken, it shall return
 * pdFALSE.
 * The function is defined in 'iot_secure_sockets.c'.
 * If that module is not included in the project, the application must provide an
 * implementation of it.
 * The macro's ipconfigRAND32() and configRAND32() are not in use anymore. */

/* "xApplicationGetRandomNumber" is declared but never defined, because it may
 * be defined in a user module. */
    extern BaseType_t xApplicationGetRandomNumber( uint32_t * pulNumber );

/* For backward compatibility define old structure names to the newer equivalent
 * structure name. */
    #ifndef ipconfigENABLE_BACKWARD_COMPATIBILITY
        #define ipconfigENABLE_BACKWARD_COMPATIBILITY    1
    #endif

    #if ( ipconfigENABLE_BACKWARD_COMPATIBILITY == 1 )
        #define xIPStackEvent_t               IPStackEvent_t
        #define xNetworkBufferDescriptor_t    NetworkBufferDescriptor_t
        #define xMACAddress_t                 MACAddress_t
        #define xWinProperties_t              WinProperties_t
        #define xSocket_t                     Socket_t
        #define xSocketSet_t                  SocketSet_t
        #define ipSIZE_OF_IP_HEADER           ipSIZE_OF_IPv4_HEADER

/* Since August 2016, the public types and fields below have changed name:
 * abbreviations TCP/UDP are now written in capitals, and type names now end with "_t". */
        #define FOnConnected                  FOnConnected_t
        #define FOnTcpReceive                 FOnTCPReceive_t
        #define FOnTcpSent                    FOnTCPSent_t
        #define FOnUdpReceive                 FOnUDPReceive_t
        #define FOnUdpSent                    FOnUDPSent_t

        #define pOnTcpConnected               pxOnTCPConnected
        #define pOnTcpReceive                 pxOnTCPReceive
        #define pOnTcpSent                    pxOnTCPSent
        #define pOnUdpReceive                 pxOnUDPReceive
        #define pOnUdpSent                    pxOnUDPSent

        #define FOnUdpSent                    FOnUDPSent_t
        #define FOnTcpSent                    FOnTCPSent_t
    #endif /* ipconfigENABLE_BACKWARD_COMPATIBILITY */

    #ifdef __cplusplus
        } /* extern "C" */
    #endif

#endif /* FREERTOS_IP_H */
