Messages in this thread | | | Date | Sun, 17 Jan 1999 21:56:03 -0800 | From | "David S. Miller" <> | Subject | Re: seq numbers and checksum in tcp |
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Date: Sun, 17 Jan 1999 23:51:41 -0600 From: Ayman El-Khashab <ayman@ccwf.cc.utexas.edu>
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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