Date: Thu, 4 Nov 2004 15:02:17 +0100 From: Jeremie Le Hen <jeremie@le-hen.org> To: Guido van Rooij <guido@gvr.org> Cc: freebsd-net@freebsd.org Subject: Re: dummynet setting ifp pointer in mbuf? Message-ID: <20041104140217.GS10641@sitadelle.com> In-Reply-To: <20041104121602.GA89896@gvr.gvr.org> References: <20041104121602.GA89896@gvr.gvr.org>
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Hi Guido, this is a known problem on RELENG_4, there is an existing patch [1] for this in the PR database. Which version of FreeBSD are you using ? I don't know if this problem has been corrected in RELENG_5. [1] http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/61685 Regards, Jeremie On Thu, Nov 04, 2004 at 01:16:02PM +0100, Guido van Rooij wrote: > > I am having problems combining ipf's ipnat rules with dummynet. The > reason is that if I use dummmynet queues configured to > be used outbound (queue .... out xmit if), then ipnat starts > applying rewriting of RDR rules on the wrong interface. > > e.g.: > firewall has 2 interfaces: if0 and if1 > if i say: > rdr from any to 1.2.3.4 port 22 -> 2.2.3.4 port 2222 > then ipfilter should rewrite incoming packets on if0 (and > outgoing packets as well). > With a dummynet rule like > queue 2 tcp from any 22 to any out xmit if0 > ipf starts rewriting on if1, which leads to blocked packets as > the rewritten packet does not match the state entry for the connection. > > When looking in the dummynet source I see (rev 1.75, line 1190): > pkt->ifp = fwa->oif; > So it seems the queued packets interface is set to the outgoing interface. > But according to me, that is wrong. > > Can a dummynet expert verify if my analysis is correct or come up > with a real explanation if not? > > -Guido -- Jeremie Le Hen jeremie@le-hen.org
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