Messages in this thread | | | Date | Wed, 26 Apr 2006 17:30:00 +0200 | From | "David G." <> | Subject | Re: How to re-send out the packets captured by my hook function at NF_IP_PRE_ROUTING |
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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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