怎样在两个tcp头之间插入数据

我要修改包，原来在一个TCP头前加了一个TCP头，现在要进行改进，还要在两个TCP头之间加入一个4字节的数字，请问如何修改。PNDIS_BUFFER pMyBuffer = NULL;
PNDIS_PACKET pMyPacket = NULL;
PVOID pBufferToSend = NULL; // Point to the data. memory new allocated.
NDIS_STATUS Status;
PRSVD Rsvd;
UINT BytesCopied,BytesToCopy;
PHEADER_DATA8023 pHeader8023;
PHEADER_DATA8022 pHeader8022;
PIP_HEADER pIpHeader = NULL; // for the new allocated memory.
PTCP_HEADER pTcpHeader = NULL; // for the new allocated memory.
PUDP_HEADER pUdpHeader = NULL; // for the new allocated memory.
UINT IpHeaderLength;

pHeader8023 = (PHEADER_DATA8023)pEtherHeader;
pHeader8022 = (PHEADER_DATA8022)pEtherHeader;

if(((NetToHostS(pHeader8023->Type)==TYPE_IP)
&&(pHeader8023->ipProtocol==IP_TCP))
||((NetToHostS(pHeader8022->Type)<ETHER_TYPE_MINIMUM)
&&(pHeader8022->ipProtocol==IP_TCP)))
{
TotalPacketLength += sizeof(TCP_HEADER); // We'll copy the TCP header.
Status = NdisAllocateMemory(&pBufferToSend,
TotalPacketLength,
0,
HighestAcceptableMax);
}
else
{
TotalPacketLength += sizeof(UDP_HEADER); // We'll copy the UDP header.
Status = NdisAllocateMemory(&pBufferToSend,
TotalPacketLength,
0,
HighestAcceptableMax);
}

if(NDIS_STATUS_SUCCESS != Status)
{
NdisMSendComplete(
pAdapter->pPrimaryAdapt->MiniportHandle,
Packet,
Status);
return Status;
}

NdisAllocateBuffer(&Status,
&pMyBuffer,
pAdapter->SendBufferPoolHandle,
pBufferToSend,
TotalPacketLength);
if(NDIS_STATUS_SUCCESS == Status)
{
NdisAllocatePacket(&Status,
&pMyPacket,
pAdapter->SendPacketPoolHandle);
if(NDIS_STATUS_SUCCESS == Status)
{
Rsvd = (PRSVD)(pMyPacket->ProtocolReserved);
Rsvd->IsOurs = TRUE;
Rsvd->OriginalPkt = Packet;
// Rsvd->pBufferToSend = pBufferToSend;

pMyPacket->Private.Flags = NdisGetPacketFlags(Packet);
NdisSetPacketFlags(pMyPacket, NDIS_FLAGS_DONT_LOOPBACK);
pMyPacket->Private.Head = pMyBuffer;
pMyPacket->Private.Tail = pMyBuffer;

//
// Copy the OOB Offset from the original packet to the new
// packet.
//
NdisMoveMemory(NDIS_OOB_DATA_FROM_PACKET(pMyPacket),
NDIS_OOB_DATA_FROM_PACKET(Packet),
sizeof(NDIS_PACKET_OOB_DATA));
//
// Copy the per packet info into the new packet
// This includes ClassificationHandle, etc.
// Make sure other stuff is not copied !!!
//
NdisIMCopySendPerPacketInfo(pMyPacket, Packet);

if(NetToHostS(pHeader8023->Type) == TYPE_IP)
{
pIpHeader = (PIP_HEADER)((PUCHAR)pBufferToSend+14);
IpHeaderLength = ((pHeader8023->ipVerLen)&0X0F)<<2;
if(pHeader8023->ipProtocol == IP_TCP)
{
BytesToCopy = 14 + IpHeaderLength + sizeof(TCP_HEADER);
NdisCopyFromPacketToPacket(pMyPacket,
0,
BytesToCopy,
Packet,
0,
&BytesCopied);
BytesToCopy = TotalPacketLength - BytesToCopy;
NdisCopyFromPacketToPacket(pMyPacket,
BytesCopied,
BytesToCopy,
Packet,
14 + IpHeaderLength,
&BytesCopied);

// pIpHeader = (PIP_HEADER)((PUCHAR)pBufferToSend + 14);
pIpHeader->ipLength = HostToNetS(
(USHORT)((UINT)NetToHostS(pIpHeader->ipLength)+sizeof(TCP_HEADER)));
pIpHeader->ipChecksum = 0;
pIpHeader->ipChecksum = CheckSum(0, (PUSHORT)pIpHeader, IpHeaderLength);

pTcpHeader = (PTCP_HEADER)((PUCHAR)pIpHeader + IpHeaderLength);
DbgPrint("Our H323App sending TCP packet, Dest Port:%d\n",
NetToHostS(pTcpHeader->destPort));
pTcpHeader->destPort = HostToNetS(WEB_PORT); // Translate the port to 80.
pTcpHeader->dataOffset = (pTcpHeader->dataOffset &0X0F)|0x50;
pTcpHeader->urgentPointer = 0;
pTcpHeader->checkSum = 0;
pTcpHeader->checkSum = CheckSumTcp(
pIpHeader,
pTcpHeader);


}

楼主的原来在一个TCP头前加了一个TCP头是什么意思？还有两个TCP头之间加入一个4字节的数字？
呵呵，也不太明白，如果你是指在二个tcp包之间在增加一个TCP包呢，还是在原来的包里面增加4个字节

一样的修改，注意校验正确