How to do packet mangling with winsock2 in windows?

I'm following examples here,

but none of them provides an example on how to modify packets(previously I used winpcap only to found that it can ONLY read packets!).

Can someone give me some clue even 开发者_运维百科which function can actually modify incoming/outgoing packets??

You have to write a custom NDIS driver or use existing solutions like WinpkFilter. There are no built-in function in Windows to modify packets in the user land.