netdev - Re: [PATCH 13/13] TProxy: use the interface primary IP address as a default value for --on-ip

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Message-ID: <4AC0E14A.10108@hp.com>
Date:	Mon, 28 Sep 2009 12:16:10 -0400
From:	Brian Haley <brian.haley@...com>
To:	Balazs Scheidler <bazsi@...abit.hu>
CC:	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 13/13] TProxy: use the interface primary IP address as
 a default value for --on-ip

Balazs Scheidler wrote:
> One question, how fast is ipv6_dev_get_saddr()? Since the TPROXY target
> can execute on a per-packet path (although the socket match should take
> care of packets that belong to already-established connections), this
> may be performance critical. Is ipv6_dev_get_saddr() something that I
> can call so often?

It probably isn't the best thing to be calling on a per-packet basis, it's
mainly called now on a per-connection basis.  I guess if it's really bad
for you we could do something like ipv6_get_lladdr() does for finding
a link-local address, it might be good enough in this case.

-Brian
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