Messages in this thread | | | Date | Thu, 13 Jun 2002 17:28:51 +0200 | From | Guillaume Morin <> | Subject | Re: TCP checksum? |
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Dans un message du 13 jun à 9:10, Shipman, Jeffrey E écrivait : > > I'm looking for a function similar to skb_checksum(), but > for the tcphdr->check field. I'm playing around with a module > I've written for netfilter and I would like to modify options of > the IP and TCP headers. For example, right now I'm trying > to set the destination IP to the source IP, but the TCP checksum > is coming out incorrectly. How can I calculate this checksum?
There is a netfilter function for that. Look at ip_nat_core.c:ip_nat_cheat_check.
-- Guillaume Morin <guillaume@morinfr.org>
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