for some research that i am working on, i am doing some experiments
with the linux kernel and some tcpip stuff in particular. In any
case, in the tcp_rcv function, i have been able to get most of the
information that i need. Now i need to modify the sequence number
of the packet and then recompute the checksum, but i am not sure
how to go about this. I have expermimented for a while and turned
up nothing.
basically, i want to just modify the th->seq and then recompute
the tcp checksum and i suspect the skb checksum.
Why do you need to recompute the checksum on incoming packets, at
tcp_rcv() the checksum has already been validated as correct and is
never checked again? ie. nobody else cares about the checksum
Later,
David S. Miller
davem@dm.cobaltmicro.com
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