From: Patrick McHardy <kaber@trash.net>
To: Gregor Maier <gregor@net.in.tum.de>
Cc: netfilter-devel@lists.netfilter.org
Subject: Re: libnetfilter_queue: get link layer header
Date: Thu, 23 Feb 2006 11:03:51 +0100 [thread overview]
Message-ID: <43FD8887.2050902@trash.net> (raw)
In-Reply-To: <43FB4989.7070901@net.in.tum.de>
Gregor Maier wrote:
> I was wondering if it's somehow possible to aquire the complete link
> level header in libnetfilter_queue. I can get the HW Protocol
> (Ethertype) and the SRC MAC but it is also possible to get the DST MAC.
>
> I know that for outgoing packets the information is only available after
> the arp lookup (so in/after POSTROUTING) but for INPUT / FORWARD packets
> the DST Mac is always available. Maybe it would be a solution to set the
> DST MAC to all zeros if it's not yet known and then add a mechanism to
> pass the DST Mac to the userspace app listeing on the queue.
I agree that the current implementation isn't perfect since it always
asks the driver to fill in its own address, even if the received packet
was a broadcast packet, instead of using the data from the packet.
I've added it to my TODO list to look into this.
prev parent reply other threads:[~2006-02-23 10:03 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-21 17:10 libnetfilter_queue: get link layer header Gregor Maier
2006-02-23 10:03 ` Patrick McHardy [this message]
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