On Mon, Jul 16, 2012 at 1:30 PM, पारस <[email protected]> wrote:
> > > On Tue, Jul 10, 2012 at 11:42 AM, Adel Kodmani <[email protected]> wrote: > >> I am writing a kernel module that actually modifies the TCP header(both >> at sending and receiving) and I need to re-calculate the header because of >> that. >> I am capturing the packets using netfilter, so I have access to the whole >> SKB, I am using Linux 2.6.35-22 >> >> Looking into the source code of the TCP/IP, I found this function >> void tcp_v4_send_check(struct sock *sk, struct sk_buff *skb); >> The comment above it says this routing computes the IPv4 TCP checksum >> >> Trying to use this function, I called it passing to it skb->sk and skb >> With no success so far. >> >> So my question is, how do I correctly calculate the TCP checksum? I know >> there's a psudoheader that must be created, and added to the calculation >> but there must be a function in the kernel I can call that already does >> that. >> >> >> Thanks in advance, >> Adel >> >> _______________________________________________ >> Kernelnewbies mailing list >> [email protected] >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >> >> I think this may be helpful to you > http://www.thegeekstuff.com/2012/05/ip-header-checksum/ > > > Nope, what I need to calculate is the TCP checksum, not the IP checksum
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