Messages in this thread | | | Date | Thu, 27 Apr 2006 10:11:44 +0800 | From | "Real Oneone" <> | Subject | Re: How to re-send out the packets captured by my hook function at NF_IP_PRE_ROUTING |
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Many thanks, David!
I've read what you mentioned and since I've done most of the work in kernelspace, I wonder if there is any way to send out the modified packet directly, when of course the mac address is not filled?
Thanks again!
2006/4/26, David G. <kiddion@zonnet.nl>: > Real Oneone wrote: > > Hi, I plugged a callback function into netfilter at the hook point of > > NF_IP_PRE_ROUTING, tring to capture all the packets, make > > some changes to some of them, and invoke skb->dev->hard_start_xmit to > > send them out directly. However, the kernel crashed before I could get > > any printked information. > > > > If you have any idea of how to send the received packets out, please tell me. > > You might want to explore the possibilities of the existing "ip_queue" > kernel extension instead, it was design to do packet > capture/inspection/changing in userspace. > > FireFlier works that way ( http://fireflier.sourceforge.net/ ) and so > does inlined snort (http://www.snort.org/docs/snort_manual/node7.html). > > You can take a look at: > http://www.linuxia.de/netfilter.en.html#userspace and > http://www.cs.princeton.edu/~nakao/libipq.htm for an example application. > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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