www.pudn.com > zlIP-8051-rtl8019as.zip > NetIf.c

/* 
 * 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  
 * 
 */ 
 
#include "..\GloblDef\GloblDef.h" 
#include "..\TCPIP\TCPIPmem.h" 
#include "..\TCPIP\IP.h" 
#include "..\TCPIP\Netif.h" 
 
/* You can get a new netif from NetIfPool */ 
static struct SNetIf DT_XDATA NetIfPool[NET_IF_MAX_NUM]; 
 
/* list hearder of free Netifs buffer */ 
static struct SNetIf DT_XDATA * DT_XDATA NetIfFreeList; 
 
/* list header of Netifs */ 
static struct SNetIf DT_XDATA * DT_XDATA NetIfList; 
 
void NetIfInit() REENTRANT_MUL 
{ 
	WORD count; 
 
	/* inti NetIfList */ 
	NetIfList = NULL; 
 
	/* inti FreeList, chain up NetIfPool */ 
	for(count = 0, NetIfFreeList = NULL; count < NET_IF_MAX_NUM; count++) 
	{ 
		NetIfPool[count].pNext = NetIfFreeList; 
		NetIfFreeList = &NetIfPool[count]; 
	} 
} 
 
/* add a netif to list, return NULL if insufficient mem */ 
struct SNetIf DT_XDATA * NetIfAdd(DWORD IPAddr, DWORD NetMask,DWORD GateWay, 
						 void (DT_CODE * input)(struct SNetIf DT_XDATA * NetIf) REENTRANT_SIG, 
						 BOOL (DT_CODE * output)(struct SMemHead DT_XDATA *MemHead,struct SNetIf DT_XDATA* NetIf,DWORD DestIP) REENTRANT_SIG, 
						 void DT_XDATA * Info) REENTRANT_MUL 
{ 
	struct SNetIf DT_XDATA * NetIf; 
 
	/* get netif from free list */ 
	NetIf = NetIfFreeList; 
	NetIfFreeList = NetIfFreeList->pNext; 
 
	/* if add more than NET_IF_MAX_NUM return NULL */ 
	if(NetIf == NULL) 
		return NULL; 
	else 
	{ 
		NetIf->IPAddr	= htonl(IPAddr); 
		NetIf->NetMask	= htonl(NetMask); 
		NetIf->GateWay	= htonl(GateWay); 
		NetIf->input	= input; 
		NetIf->output	= output; 
		NetIf->Info		= Info; 
 
		/* add to the head of the list */ 
		NetIf->pNext = NetIfList; 
		NetIfList = NetIf; 
 
		return NetIf; 
	} 
} 
 
/* find a netif which NetIf->NetMask & NetIf->NetAddr ==  
NetIf->NetMask & IPAddr */ 
struct SNetIf DT_XDATA * NetIfFindRout(IP_ADDR IPAddr) REENTRANT_SIG 
{ 
	struct SNetIf DT_XDATA *NetIf; 
	for(NetIf = NetIfList; NetIf != NULL; NetIf = NetIf->pNext) 
	{ 
		if((NetIf->NetMask & NetIf->IPAddr) == (NetIf->NetMask & IPAddr)) 
			return NetIf; 
	} 
 
	/* if can't find any suitable Netif, return NetIfList. That is the  
	first netif is the default Netif*/ 
	return NetIfList;	 
} 
 
struct SNetIf DT_XDATA * NetIfFindIP(IP_ADDR IPAddr) REENTRANT_MUL 
{ 
	struct SNetIf DT_XDATA *pNetIf; 
	for(pNetIf = NetIfList; pNetIf != NULL; pNetIf = pNetIf->pNext) 
	{ 
		if(pNetIf->IPAddr == IPAddr) 
			break; 
	} 
	return pNetIf; 
} 
 
/* net inteftimer. use to packup packet from every net interface */ 
void NetIfTimer() REENTRANT_MUL 
{ 
	struct SNetIf DT_XDATA * NetIf; 
 
	/* if netif has data to come in */ 
	for(NetIf = NetIfList; NetIf != NULL; NetIf = NetIf->pNext) 
		NetIf->input(NetIf); 
}