www.pudn.com > zlIP-8051-rtl8019as.zip > IP.h

/* 
 * Copyright (c) 2003 Electric Application Laboratory of NAN KAI University 
 * All rights reserved. 
 * 
 * Redistribution and use in source and binary forms, with or without modification, 
 * are permitted provided that the following conditions are met: 
 * 
 * 1. Redistributions of source code must retain the above copyright notice, 
 *    this list of conditions and the following disclaimer. 
 * 2. Redistributions in binary form must reproduce the above copyright notice, 
 *    this list of conditions and the following disclaimer in the documentation 
 *    and/or other materials provided with the distribution. 
 * 3. The name of the author may not be used to endorse or promote products 
 *    derived from this software without specific prior written permission. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 
 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
 * OF SUCH DAMAGE. 
 * 
 * Author: Li Zhanglin  
 * 
 */ 
 
/* IP */ 
//#define IP_ENABLE_FORWARD	/* enable packet come in an forward act as a router */ 
#define IP_VERSION_4	4 
 
#define IP_HEAD_MIN_LEN	20	/* ip head len with no option */ 
 
#define IP_INITIAL_LIFE 20 
 
#define IP_PROTOCOL_TCP		0x06	 
#define IP_PROTOCOL_ICMP	0x01 
 
/* caculate ip version of a packet */ 
#define IP_VERSION(pIPHead) (pIPHead->Ver_HeadLen>>4) 
 
/* caculate ip head len of a packet.head len in Ver_HeadLen  
is mulitple of 4 byte */ 
#define IP_HEAD_LEN(pIPHead) ((pIPHead->Ver_HeadLen & 0x0f)*4) 
 
typedef DWORD IP_ADDR; 
 
struct SIPHead 
{ 
	/* Version 4 bits, HeadLength 4 bits. typical value is 0x45 */ 
	BYTE Ver_HeadLen;	 
 
	/* Precedence(priority) 3 bits, Delay, Throughput, Reliability 
	, reserved 2 bits. typical value 0x00 */ 
	BYTE ServeType;	 
 
	WORD TotalLen;				/* all size of IP packet inlcude IPHead. 16 bits */ 
	WORD FragmentID;			/* 16 bits */ 
 
	/* Reserved 1 bit, May be fragmented 1 bit, Last fragment 1 bit,  
	Fragment offset 13 bits. typical 0x00 */ 
#define	IP_FRAGMENT_OFFSET_MASK	0x1FFF 
	WORD FragmentFlag_Offset;	 
 
	BYTE LifeLength;			/* ttl */ 
	BYTE Protocol;				/* eg. IP_PROTOCAL_TCP*/ 
	WORD CheckSum;				/* 16 bits */ 
	IP_ADDR IPScr;				/* 32 bits */ 
	IP_ADDR IPDest; 
}; 
 
WORD CheckSum(WORD DT_XDATA * buff,WORD size,DWORD InSum) REENTRANT_SIG; 
void IPInput(struct SMemHead DT_XDATA *MemHead) REENTRANT_MUL; 
BOOL IPOutput(struct SMemHead DT_XDATA * MemHead) REENTRANT_SIG;