?? tcpip.c
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///
// Copyright (c) 2003, Wolver Wang, MinShan Inc. R&D Center
// wolver@minshan-inc.com
// 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. All advertising materials mentioning features or use of this software
// must display the following acknowledgement:
// This product includes software developed by Wolver Wang.
// 4. 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.
///
///
// Copyright (c) 2003, Wolver Wang, MinShan Inc. R&D Center
// wolver@minshan-inc.com
// 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. All advertising materials mentioning features or use of this software
// must display the following acknowledgement:
// This product includes software developed by Wolver Wang.
// 4. 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.
///
///
// 版權(quán) 2003, 王衛(wèi)無(wú)，四川綿陽(yáng)岷山集團(tuán)有限公司--研究開(kāi)發(fā)中心
// wolver@minshan-inc.com
// 保留一切權(quán)利
//
// 如果符合以下條件，則無(wú)論是以原代碼或非原代碼代碼形式，且不論是否修改，
// 再分發(fā)和使用本軟件都是被允許的。
// 1. 原代碼的再分發(fā)必須保留上述的版權(quán)聲明、本條件說(shuō)明和以下免責(zé)聲明。
// 2. 非原代碼形式的再分發(fā)，必須在證明文件和(或)其它一同提供的材料中重新
// 作上述的版權(quán)聲明、本條件說(shuō)明和以下免責(zé)聲明。
// 3. 一切提及本軟件和使用的廣告材料必須顯示以下致謝：
// 本產(chǎn)品包含王衛(wèi)無(wú)（四川綿陽(yáng)岷山集團(tuán)有限公司--研究開(kāi)發(fā)中心）開(kāi)發(fā)的軟件。
// 4. 如果沒(méi)有預(yù)先得到特定的書(shū)面許可，不能用作者的名字來(lái)宣傳推廣基于本軟件得到
// 的產(chǎn)品。
//
// 免責(zé)聲明：
// 本軟件是由某某作者提供，如果出現(xiàn)以下情況，作者都不承擔(dān)任何責(zé)任。
// 1. 因作者的說(shuō)明以及任何明確的或暗示的保證(包括但不限于表達(dá)某種商業(yè)性和適合某一
// 特定目的暗示性保證)而產(chǎn)生的損失。
// 2. 無(wú)論在何種情況下，對(duì)使用本軟件造成的任何直接的、間接的、偶然的、特定的、可預(yù)
// 見(jiàn)性的和連帶產(chǎn)生的損失(包括但不限于獲取產(chǎn)品和服務(wù)、作用喪失、數(shù)據(jù)遺失、利益損
// 失或商業(yè)干預(yù))，無(wú)論這些損失是怎樣造成的，并且是以何種方式闡釋責(zé)任。
// 3. 任何因使用本軟件而相關(guān)的合同、嚴(yán)格賠償責(zé)任和侵權(quán)行為(包含：疏忽或其它)的損失，
// 甚至即便是可能的此類(lèi)已經(jīng)明示或暗示的損失。
///
#include "tcpip.h"
#if TCP_DHCP == 0
const UINT16 guwIpAddr[2] = {((cIpAddr1<<8)|cIpAddr2), ((cIpAddr3<<8)|cIpAddr4)};
#else
UINT16 guwIpAddr[2];
#endif
#if TCP_DHCP == 0
const UINT16 guwNetMask[2] = {((cNetMask1<<8)|cNetMask2), ((cNetMask3<<8)|cNetMask4)};
#else
UINT16 guwNetMask[2];
#endif
#if TCP_DHCP == 0
const UINT16 guwDR_IpAddr[2] = {((cDR_IpAddr1<<8)|cDR_IpAddr2), ((cDR_IpAddr3<<8)|cDR_IpAddr4)};
#else
UINT16 guwDR_IpAddr[2];
#endif
const UINT16 guwEthAddr[3] = {((cEthAddr1<<8)|cEthAddr2), ((cEthAddr3<<8)|cEthAddr4), ((cEthAddr5<<8)|cEthAddr6)};
// 最大允許的以太包緩沖區(qū)
UINT16 guwEthBuf[cEthBufSize];
// 正在處理包的字節(jié)長(zhǎng)度。這個(gè)值隨處理層的不同而改變！
volatile UINT16 guwEthLen = 0;
// 分配ARP表的內(nèi)寸
ArpEntries_Stru gstArpTab[cArpTabSize];
// 記錄本地IP序號(hào)
volatile UINT16 guwIpId;
// TCP 本地初始32位序號(hào)
volatile UINT16 guwISN[2];
// 記錄TCP本地端口號(hào)
UINT16 guwListenPorts[cMaxListenPorts];
// TCP最大聯(lián)接事務(wù)記錄表
Conn_Stru gstConns[cMaxConnetions];
// 當(dāng)前TCP事務(wù)聯(lián)接指針
Conn_Stru *gptConn;
// TCP/IP協(xié)議棧和應(yīng)用程序間通訊的變量
volatile UINT16 guwFlags;
//--------------------------------------------------------------------------------------
void msip_Init(void){
UINT16 index;
// Initialize ArpEntries
for (index = 0; index < cArpTabSize; index++){
gstArpTab[index].IpAddr[0] = 0;
gstArpTab[index].IpAddr[1] = 0;
}
// Initialize Listen Ports
for (index = 0; index < cMaxListenPorts; index++)
guwListenPorts[index] = 0;
// Initialize Listen Ports
for (index = 0; index < cMaxConnetions; index++){
gstConns[index].TcpStateFlags = cTCP_CLOSED;
gstConns[index].PollTime = 0;
}
}
//--------------------------------------------------------------------------------------
void msip_Arp_Time(){
ArpEntries_Stru *pARP;
for (pARP = cptArpTabStart; pARP < cptArpTabEnd; pARP++){
if (((pARP->IpAddr[0] | pARP->IpAddr[1]) != 0) && ((guwTime2 - pARP->Time2) > 2*cArpMaxAge)){
pARP->IpAddr[0] = 0;
pARP->IpAddr[1] = 0;
}
}
guwMsg_Route &= ~cM_ARP_TIME; // 清除ARP表老化處理事件
}
//--------------------------------------------------------------------------------------
ArpEntries_Stru *msip_Arp_Update(UINT16 *uwIpAddr, UINT16 *uwEthAddr){
ArpEntries_Stru *pARPTAB, *pARPTAB1;
UINT16 maxtime,cmptime;
// 如果接收包的源地址與本地相同，說(shuō)明是DDoS攻擊！！！
if ((uwIpAddr[0] == guwIpAddr[0]) && (uwIpAddr[1] == guwIpAddr[1])){
return cptArpTabEnd;
}
// 如果找到匹配的IP，就更新MAC
for (pARPTAB = cptArpTabStart; pARPTAB < cptArpTabEnd; pARPTAB++){
if((pARPTAB->IpAddr[0] == uwIpAddr[0]) && (pARPTAB->IpAddr[1] == uwIpAddr[1])){
goto Arp_Update_Exit2; // 更新 MAC/Time
}
}
// 沒(méi)有找到匹配IP，找個(gè)空記錄來(lái)更新
for (pARPTAB = cptArpTabStart; pARPTAB < cptArpTabEnd; pARPTAB++){
if((pARPTAB->IpAddr[0] | pARPTAB->IpAddr[1]) == 0){
goto Arp_Update_Exit1; // 更新 IP/MAC/Time
}
}
// 既沒(méi)有匹配IP，又沒(méi)有空記錄！把時(shí)間最長(zhǎng)的記錄更新
maxtime = 0;
for (pARPTAB1 = cptArpTabStart; pARPTAB1 < cptArpTabEnd; pARPTAB1++){
cmptime = guwTime2 - pARPTAB1->Time2; // 計(jì)算記錄存放時(shí)間
if(cmptime > maxtime){
maxtime = cmptime; // 記錄最大時(shí)間
pARPTAB = pARPTAB1; // 記錄ARP表指針
}
}
Arp_Update_Exit1:
pARPTAB->IpAddr[0] = uwIpAddr[0];
pARPTAB->IpAddr[1] = uwIpAddr[1];
Arp_Update_Exit2:
pARPTAB->EthAddr[0] = uwEthAddr[0];
pARPTAB->EthAddr[1] = uwEthAddr[1];
pARPTAB->EthAddr[2] = uwEthAddr[2];
pARPTAB->Time2 = guwTime2;
return pARPTAB;
}
//--------------------------------------------------------------------------------------
void msip_Arp_In(void){
// 如果接收包的源地址與本地相同，說(shuō)明是DDoS攻擊！！！
if ((cptArpHdrBuf->SndIpAddr[0] == guwIpAddr[0]) &&
(cptArpHdrBuf->SndIpAddr[1] == guwIpAddr[1])){
goto arp_in_exit;
}
// 如果不是請(qǐng)求本地，就退出！
if ((cptArpHdrBuf->RcvIpAddr[0] != guwIpAddr[0]) ||
(cptArpHdrBuf->RcvIpAddr[1] != guwIpAddr[1])){
goto arp_in_exit;
}
switch (cptArpHdrBuf->OpCode){
case cArpRequest:
// 如果是ARP請(qǐng)求，就構(gòu)造ARP回應(yīng)
cptEthHdrBuf->DestEthAddr[0] = cptArpHdrBuf->SndEthAddr[0];
cptArpHdrBuf->RcvEthAddr[0] = cptArpHdrBuf->SndEthAddr[0];
cptEthHdrBuf->DestEthAddr[1] = cptArpHdrBuf->SndEthAddr[1];
cptArpHdrBuf->RcvEthAddr[1] = cptArpHdrBuf->SndEthAddr[1];
cptEthHdrBuf->DestEthAddr[2] = cptArpHdrBuf->SndEthAddr[2];
cptArpHdrBuf->RcvEthAddr[2] = cptArpHdrBuf->SndEthAddr[2];
cptEthHdrBuf->SrcEthAddr[0] = guwEthAddr[0];
cptArpHdrBuf->SndEthAddr[0] = guwEthAddr[0];
cptEthHdrBuf->SrcEthAddr[1] = guwEthAddr[1];
cptArpHdrBuf->SndEthAddr[1] = guwEthAddr[1];
cptEthHdrBuf->SrcEthAddr[2] = guwEthAddr[2];
cptArpHdrBuf->SndEthAddr[2] = guwEthAddr[2];
cptArpHdrBuf->RcvIpAddr[0] = cptArpHdrBuf->SndIpAddr[0];
cptArpHdrBuf->RcvIpAddr[1] = cptArpHdrBuf->SndIpAddr[1];
cptArpHdrBuf->SndIpAddr[0] = guwIpAddr[0];
cptArpHdrBuf->SndIpAddr[1] = guwIpAddr[1];
cptArpHdrBuf->OpCode = cArpReply;
// cptEthHdrBuf->EthType: is unchanged
// cptArpHdrBuf->HwType: is unchanged
// cptArpHdrBuf->ProtoType: is unchanged
// cptArpHdrBuf->HwLen8Proto8: is unchanged
// 發(fā)送以太包
guwEthLen = 60;
ether_Send();
break;
case cArpReply:
// 如果是ARP回應(yīng)，就更新ARP表
msip_Arp_Update(cptArpHdrBuf->SndIpAddr, cptArpHdrBuf->SndEthAddr);
}
arp_in_exit:
// 釋放緩沖區(qū)
guwEthLen = 0;
}
//--------------------------------------------------------------------------------------
void msip_Arp_Out(ArpEntries_Stru *pARPTAB){
// 如果指針是否在ARP表范圍內(nèi)，就構(gòu)造以太頭
if ((pARPTAB >= cptArpTabStart) && (pARPTAB < cptArpTabEnd)){
goto build_eth;
}
// 指針不在ARP范圍，檢查遠(yuǎn)端IP是否在本地網(wǎng)內(nèi)，以決定ARP請(qǐng)求的遠(yuǎn)端IP地址
if (((cptIpHdrBuf->DestIpAddr[0] & guwNetMask[0]) == (guwIpAddr[0] & guwNetMask[0])) &&
((cptIpHdrBuf->DestIpAddr[1] & guwNetMask[1]) == (guwIpAddr[1] & guwNetMask[1]))){
// IP在本地網(wǎng)內(nèi)，在ARP表里查找對(duì)應(yīng)遠(yuǎn)端IP地址的表指針
for (pARPTAB = cptArpTabStart; pARPTAB < cptArpTabEnd; pARPTAB++){
if((pARPTAB->IpAddr[0] == cptIpHdrBuf->DestIpAddr[0]) &&
(pARPTAB->IpAddr[1] == cptIpHdrBuf->DestIpAddr[1])){
goto build_eth;
}
}
goto request_local;
} else {
// 遠(yuǎn)端IP不在本地網(wǎng)內(nèi)，在ARP表里查找網(wǎng)關(guān)IP地址的表指針
for (pARPTAB = cptArpTabStart; pARPTAB < cptArpTabEnd; pARPTAB++){
if((pARPTAB->IpAddr[0] == guwDR_IpAddr[0]) && (pARPTAB->IpAddr[1] == guwDR_IpAddr[1])){
goto build_eth;
}
}
//goto request_gateway;
}
// 如果到這里，表明在ARP表里找不到相應(yīng)的IP記錄！所以構(gòu)造需要的ARP請(qǐng)求包
request_gateway:
cptArpHdrBuf->RcvIpAddr[0] = guwDR_IpAddr[0];
cptArpHdrBuf->RcvIpAddr[1] = guwDR_IpAddr[1];
goto build_arp;
request_local:
cptArpHdrBuf->RcvIpAddr[0] = cptIpHdrBuf->DestIpAddr[0];
cptArpHdrBuf->RcvIpAddr[1] = cptIpHdrBuf->DestIpAddr[1];
build_arp:
cptArpHdrBuf->SndIpAddr[0] = guwIpAddr[0];
cptArpHdrBuf->SndIpAddr[1] = guwIpAddr[1];
cptEthHdrBuf->DestEthAddr[0] = 0xffff;
cptEthHdrBuf->DestEthAddr[1] = 0xffff;
cptEthHdrBuf->DestEthAddr[2] = 0xffff;
cptArpHdrBuf->RcvEthAddr[0] = 0x0000;
cptArpHdrBuf->RcvEthAddr[1] = 0x0000;
cptArpHdrBuf->RcvEthAddr[2] = 0x0000;
cptEthHdrBuf->SrcEthAddr[0] = guwEthAddr[0];
cptArpHdrBuf->SndEthAddr[0] = guwEthAddr[0];
cptEthHdrBuf->SrcEthAddr[1] = guwEthAddr[1];
cptArpHdrBuf->SndEthAddr[1] = guwEthAddr[1];
cptEthHdrBuf->SrcEthAddr[2] = guwEthAddr[2];
cptArpHdrBuf->SndEthAddr[2] = guwEthAddr[2];
cptEthHdrBuf->EthType = cEthType_Arp;
cptArpHdrBuf->HwType = cHwType_Eth;
cptArpHdrBuf->ProtoType = cEthType_Ip;
cptArpHdrBuf->Hw8Proto8 = c_vIP4;
cptArpHdrBuf->OpCode = cArpRequest;
guwEthLen = 60;
goto send_eth; // 跳到發(fā)送以太包處理
build_eth:
// 構(gòu)造需要的以太頭
cptEthHdrBuf->DestEthAddr[0] = pARPTAB->EthAddr[0];
cptEthHdrBuf->DestEthAddr[1] = pARPTAB->EthAddr[1];
cptEthHdrBuf->DestEthAddr[2] = pARPTAB->EthAddr[2];
cptEthHdrBuf->SrcEthAddr[0] = guwEthAddr[0];
cptEthHdrBuf->SrcEthAddr[1] = guwEthAddr[1];
cptEthHdrBuf->SrcEthAddr[2] = guwEthAddr[2];
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