Add a IP HEADER before original IP HEADER

I am developing a ndis hook driver!I need to add a ip header
before original ip header in client side and analyze the added
header in server side.
I can get the ndis packet. so whats the folllowing step should I
do?

I thinked about it:

1 allocate a ndis buffer and VM
2 copy the data (in front of ip header, in the first buffer) into my
own buffer
3 add my own ip header into my buffer
4 copy the remain data in the first buffer into my own buffer
5 chain my own buffer into ndispacket
6 chain other buffer in the original packet.

I am developing a ndis hook driver!I need to add a ip header
before original ip header in client side and analyze the added
header in server side.
I can get the ndis packet. so whats the folllowing step should I
do?

I thinked about it:

1 allocate a ndis buffer and VM
2 copy the data (in front of ip header, in the first buffer) into my
own buffer
3 add my own ip header into my buffer
4 copy the remain data in the first buffer into my own buffer
5 chain my own buffer into ndispacket
6 chain other buffer in the original packet.
 

Note: U need think about MTU !

我准备更改windows发包的MTU，这样就不用分大包了!

如何修改?

使用修改注册表方法吗?

[编辑 -  6/9/05 by  cyliu]

我在http://groups.yahoo.com/group/discussion-pcausa/
上看到一些这方面的资料，准备试试。
我现在想知道，如何在NDIS PACKET中加个ip包头
cyliu你不是做过吗，能给点建议吗？

加个ip头不难啊!你有什么困难吗?

我也遇到类似的问题；

我修改了系统了MTU，为1496

然后，我截获了数据包，将包MTU改回1500；

然后在TCP/IP数据包尾部，加上4个字节自己的东西；

SPI是不能做到的；

TDI据说有些包会漏抓，而且也不知道是否能修改数据；

NDIS太补了，不太象那么做；

谁能给点意见；

我写了以下代码，组包，发包

NDIS_STATUS NDIS_API
XF_SendPacket(
IN NDIS_HANDLE MacBindingHandle,
IN PNDIS_PACKET Packet
)
{

PNDIS_PACKET OurPacket = NULL;
NDIS_STATUS Status = NDIS_STATUS_SUCCESS;
PNDIS_BUFFER pNdisBuffer,pOurBuffer;
ULONG PacketLength = 0;
ULONG bytescopied = 0;
PVOID virtualaddr = NULL;
NDIS_HANDLE MyPacketPool;
NDIS_HANDLE MyBufferPool;

NdisAllocatePacketPoolEx(&Status,
&MyPacketPool,
MIN_PACKET_POOL_SIZE,
MAX_PACKET_POOL_SIZE - MIN_PACKET_POOL_SIZE,
PROTOCOL_RESERVED_SIZE_IN_PACKET);
NdisAllocateBufferPool(&Status,&MyBufferPool,0xff);
NdisDprAllocatePacket(&Status, &OurPacket, MyPacketPool);
NdisQueryPacket(Packet,NULL,NULL,&pNdisBuffer,&PacketLength );

NdisAllocateMemoryWithTag(&virtualaddr,PacketLength,\'DMSA\');

NdisAllocateBuffer(&Status,&pOurBuffer,MyBufferPool,virtualaddr,PacketLength);

NdisChainBufferAtFront(OurPacket,pOurBuffer);
NdisCopyFromPacketToPacket(OurPacket,0,PacketLength,Packet,0,&bytescopied);

Status=m_pSendHandler(MacBindingHandle, OurPacket);
if(Status != NDIS_STATUS_PENDING)
{
NdisFreePacket(OurPacket);
}
return Status;

}

但系统没登陆就重启了，如果把Status=m_pSendHandler(MacBindingHandle, OurPacket);改成Status=m_pSendHandler(MacBindingHandle, Packet);也就是发原来的包，系统就不重启
请问我的程序哪错了？

NdisCopyFromPacketToPacket does not copy any out-of-band information associated with the given Source to the Destination. To copy this information, the driver can use pointers returned by NDIS_OOB_DATA_FROM_PACKET and then call NdisMoveMemory.

还有,你跟踪一下,看看是在哪里出来错误!

[编辑 -  6/15/05 by  cyliu]

我现在在NDIS PACKET中又加了个IP包头，但加上后 以太桢的CRC出错，不知道这是为什么啊，CRC是硬件加上去的吧，为什么会出错!