Demos/Device/ClassDriver/RNDISEthernet/Lib/IP.h

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2012.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2012  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, distribute, and sell this
  13   software and its documentation for any purpose is hereby granted
  14   without fee, provided that the above copyright notice appear in
  15   all copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaim all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 /** \file
  32  *
  33  *  Header file for IP.c.
  34  */
  35
  36 #ifndef _IP_H_
  37 #define _IP_H_
  38
  39         /* Includes: */
  40                 #include <avr/io.h>
  41                 #include <string.h>
  42
  43                 #include "EthernetProtocols.h"
  44                 #include "Ethernet.h"
  45                 #include "ProtocolDecoders.h"
  46                 #include "Config/AppConfig.h"
  47
  48         /* Macros: */
  49                 /** Protocol IP address of the broadcast address. */
  50                 #define BROADCAST_IP_ADDRESS             {0xFF, 0xFF, 0xFF, 0xFF}
  51
  52                 /** Default Time To Live (TTL) value for sent packets, indicating the maximum allowable hops until their destination
  53                  *  is reached.
  54                  */
  55                 #define DEFAULT_TTL                      128
  56
  57                 /** Performs a comparison between two IP addresses, indicating if they are identical.
  58                  *
  59                  *  \param[in] IP1  First IP address
  60                  *  \param[in] IP2  Second IP address
  61                  *
  62                  *  \return True if the addresses match, false otherwise
  63                  */
  64                 #define IP_COMPARE(IP1, IP2)             (memcmp(IP1, IP2, sizeof(IP_Address_t)) == 0)
  65
  66         /* Type Defines: */
  67                 /** Type define of an IP packet header. */
  68                 typedef struct
  69                 {
  70                         unsigned     HeaderLength   : 4; /**< Total length of the packet header, in 4-byte blocks */
  71                         unsigned     Version        : 4; /**< IP protocol version */
  72                         uint8_t      TypeOfService; /**< Special service type identifier, indicating delay/throughput/reliability levels */
  73                         uint16_t     TotalLength; /**< Total length of the IP packet, in bytes */
  74
  75                         uint16_t     Identification; /**< Identification value for identifying fragmented packets */
  76                         unsigned     FragmentOffset : 13; /**< Offset of this IP fragment */
  77                         unsigned     Flags          : 3; /**< Fragment flags, to indicate if a packet is fragmented */
  78
  79                         uint8_t      TTL; /**< Maximum allowable number of hops to reach the packet destination */
  80                         uint8_t      Protocol; /**< Encapsulated protocol type */
  81                         uint16_t     HeaderChecksum; /**< Ethernet checksum of the IP header */
  82
  83                         IP_Address_t SourceAddress; /**< Source protocol IP address of the packet */
  84                         IP_Address_t DestinationAddress; /**< Destination protocol IP address of the packet */
  85                 } IP_Header_t;
  86
  87         /* Function Prototypes: */
  88                 int16_t IP_ProcessIPPacket(Ethernet_Frame_Info_t* const FrameIN,
  89                                            void* InDataStart,
  90                                            void* OutDataStart);
  91
  92 #endif
  93