--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/network/PPP.h	Fri Sep 07 23:53:53 2012 +0800
@@ -0,0 +1,196 @@
+/*
+    LUFA Powered Wireless 3G Modem Host
+	
+    Copyright (C) Mike Alexander, 2010.
+     Copyright (C) Dean Camera, 2010.
+*/
+
+/*
+  Copyright 2010  Mike Alexander (mike [at] mikealex [dot] com)
+  Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+  Permission to use, copy, modify, distribute, and sell this 
+  software and its documentation for any purpose is hereby granted
+  without fee, provided that the above copyright notice appear in 
+  all copies and that both that the copyright notice and this
+  permission notice and warranty disclaimer appear in supporting 
+  documentation, and that the name of the author not be used in 
+  advertising or publicity pertaining to distribution of the 
+  software without specific, written prior permission.
+
+  The author disclaim all warranties with regard to this
+  software, including all implied warranties of merchantability
+  and fitness.  In no event shall the author be liable for any
+  special, indirect or consequential damages or any damages
+  whatsoever resulting from loss of use, data or profits, whether
+  in an action of contract, negligence or other tortious action,
+  arising out of or in connection with the use or performance of
+  this software.
+*/
+
+#ifndef _PPP_H_
+#define _PPP_H_
+
+	/* Includes: */
+		#include <util/crc16.h>
+		#include <stdbool.h>
+		#include <stdint.h>
+
+		#include "LinkManagement.h"
+		#include "Lib/RingBuff.h"
+		#include "Lib/Debug.h"
+	
+	/* Enums: */
+
+		typedef enum
+		{
+			PPP_LAYER_Physical,
+			PPP_LAYER_Authentication,
+			PPP_LAYER_Network,
+		} PPP_Layers_t;
+
+		typedef enum
+		{
+			PPP_PHASE_Dead,
+			PPP_PHASE_Establish,
+			PPP_PHASE_Authenticate,
+			PPP_PHASE_Network,
+			PPP_PHASE_Terminate
+		} PPP_Phases_t;
+
+		typedef enum
+		{
+			PPP_STATE_Initial,
+			PPP_STATE_Starting,
+			PPP_STATE_Closed,
+			PPP_STATE_Stopped,
+			PPP_STATE_Closing,
+			PPP_STATE_Stopping,
+			PPP_STATE_Req_Sent,
+			PPP_STATE_Ack_Rcvd,
+			PPP_STATE_Ack_Sent,
+			PPP_STATE_Opened
+		} PPP_States_t;
+
+		typedef enum
+		{
+			PPP_EVENT_Up,
+			PPP_EVENT_Down,
+			PPP_EVENT_Open,
+			PPP_EVENT_Close,
+			PPP_EVENT_TOPlus,
+			PPP_EVENT_TOMinus,
+			PPP_EVENT_RCRPlus,
+			PPP_EVENT_RCRMinus,
+			PPP_EVENT_RCA,
+			PPP_EVENT_RCN,
+			PPP_EVENT_RTR,
+			PPP_EVENT_RTA,
+			PPP_EVENT_RUC,
+			PPP_EVENT_RXJPlus,
+			PPP_EVENT_RXJMinus,
+			PPP_EVENT_RXR
+		} PPP_Events_t;
+
+	/* Type Defines: */
+		typedef struct
+		{
+			uint8_t Type;
+			uint8_t Length;
+			uint8_t Data[];
+		} PPP_Option_t;		
+
+		typedef struct
+		{
+			uint8_t Code;
+			uint8_t PacketID;
+			uint16_t Length;
+			PPP_Option_t Options[];
+		} PPP_Packet_t;
+
+	/* Macros: */
+		#define CALC_CRC16(crcvalue, c)    _crc_ccitt_update(crcvalue, c);
+
+		// Defines for LCP Negotiation Codes
+		#define	REQ						1							// Request options list for PPP negotiations
+		#define	ACK						2							// Acknowledge options list for PPP negotiations
+		#define	NAK						3							// Not acknowledged options list for PPP negotiations
+		#define	REJ						4							// Reject options list for PPP negotiations
+		#define	TERMREQ					5							// Termination request for LCP to close connection
+		#define	TERMREPLY				6							// Termination reply
+		#define CODEREJ					7							// Code reject
+		#define PROTREJ					8							// Protocol reject
+		#define ECHOREQ					9							// Echo Request
+		#define ECHOREPLY				10							// Echo Reply
+		#define DISC 					11							// Discard request
+
+		// Packet Types (Protocols)
+		#define	IP 						0x0021						// Internet Protocol packet
+		#define	IPCP 					0x8021						// Internet Protocol Configure Protocol packet
+		#define	LCP						0xC021						// Link Configure Protocol packet
+		#define	PAP						0xC023						// Password Authentication Protocol packet
+		#define CHAP 					0xC223						// Challenge Handshake Authentication Protocol packet
+		#define NONE 					0x0000
+
+		#define LCP_OPTION_Maximum_Receive_Unit 					0x1		// LCP Option 1
+		#define LCP_OPTION_Async_Control_Character_Map 				0x2		// LCP Option 2
+		#define LCP_OPTION_Authentication_Protocol 					0x3		// LCP Option 3
+		#define LCP_OPTION_Quality_Protocol 						0x4		// LCP Option 4
+		#define LCP_OPTION_Magic_Number 							0x5		// LCP Option 5
+		#define LCP_OPTION_Reserved			 						0x6		// LCP Option 6
+		#define LCP_OPTION_Protocol_Field_Compression 				0x7		// LCP Option 7
+		#define LCP_OPTION_Address_and_Control_Field_Compression 	0x8		// LCP Option 8
+		#define LCP_OPTION_Callback								 	0xd		// LCP Option D
+
+		#define IPCP_OPTION_IP_Compression_Protocol					0x2		// IPCP Option 2
+		#define IPCP_OPTION_IP_address								0x3		// IPCP Option 3
+		#define IPCP_OPTION_Primary_DNS								0x81	// IPCP Option 81
+		#define IPCP_OPTION_Secondary_DNS							0x83	// IPCP Option 83
+
+		#define MAX_RESTARTS										5
+		#define OUTGOING_PACKET_BUFFER_SIZE							48
+
+	/* External Variables: */
+		extern uint8_t ConnectedState;
+
+	/* Function Prototypes: */
+		void PPP_ManageLink(void);
+		void PPP_InitPPP(void);
+		void PPP_LinkTimer(void);
+		void PPP_LinkUp(void);
+		void PPP_LinkOpen(void);
+		void PPP_StartLink(void);
+
+		#if defined(INCLUDE_FROM_PPP_C)
+			static PPP_Option_t* PPP_GetNextOption(const PPP_Packet_t* const ThisPacket,
+			                                       const PPP_Option_t* const CurrentOption);
+			static void PPP_RemoveOption(PPP_Packet_t* const ThisPacket,
+			                             const uint8_t Type);
+			static void PPP_AddOption(const PPP_Option_t*);
+			static bool PPP_CheckForOption(const PPP_Option_t*);
+			static void PPP_ChangeOption(PPP_Packet_t* const ThisPacket,
+			                             const PPP_Option_t* const Option);
+			static void PPP_ProcessNAK(void);
+			static void PPP_ProcessREJ(void);
+			static bool PPP_TestForNAK(const PPP_Option_t* const Option);
+			static bool PPP_TestForREJ(const uint8_t Options[],
+			                           const uint8_t NumOptions);
+			static void PPP_ManageState(const PPP_Events_t Event,
+										PPP_States_t* const State,
+										PPP_Layers_t const Layer);
+			static void Send_Configure_Request(void);
+			static void Send_Configure_Ack(void);
+			static void Send_Configure_Nak_Rej(void);
+			static void Send_Terminate_Request(void);
+			static void Send_Terminate_Ack(void);
+			static void Send_Code_Reject(void);
+			static void Send_Echo_Reply(void);
+			static void This_Layer_Up(PPP_Layers_t Layer);
+			static void This_Layer_Down(PPP_Layers_t Layer);
+			static void This_Layer_Started(PPP_Layers_t Layer);
+			static void This_Layer_Finished(PPP_Layers_t Layer);
+		#endif
+		
+#endif
+
+