How to get the IP and TCP fields in mbuf

Thu Jan 8 14:15:45 UTC 2015

Hi Wei,

Are you looking for something like this?

+	struct ip *ip = mtod(m, struct ip *);

m is a struct mbuf *. You cann look into my knock-patch for FreeBSD [0]
for further examples.

Best,
Julian

[0] https://gnunet.org/knock

On 08.01.2015 14:18, Wei Hu wrote:
> Hi,
> 
> I am wondering if there is existing macros in the FreeBSD kernel to extract to get to the point of the IP and TCP head in a given mbuf.
> 
> Thanks,
> Wei
> 
> 
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-- 
Julian Kirsch
Chair for IT-Security (I20)
Department of Computer Science, Technische Universität München
Boltzmannstrasse 3, D-85748 Garching bei München
Phone: +49-89-289-18587
Room: 01.08.53