From mboxrd@z Thu Jan 1 00:00:00 1970 From: Patrick McHardy Date: Sat, 23 Mar 2002 13:09:04 +0000 Subject: Re: [LARTC] How to mark a device not to be used with IMQ? Message-Id: List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: lartc@vger.kernel.org Nils Lichtenfeld schrieb: > Hello Patrick! Hi Nils, > From: "Patrick McHardy" > > > this is only internal mark to know whether the skb was > > > already in IMQ. You could use it but you would have to > > > add new user parameter to the interface structure. > > > I didn't want to do it as I want the pach to be as simple > > > as possible. > > > devik > > > The same problem was bugging me a couple of days ago so i wrote an > > iptables target which > > allows you to exclude packets from beeing enqueued to the imq device. > > The patch is tested with iptables-1.2.6a but should work with almost any > > recent version. > > After applying it you have to execute a "chmod +x > > extensions/.IMQX-test", then > > make patch-o-matic as usual. > > This sounds great and might be usefull in the future. We are still using 2.2.19 > here so no iptables atm. I think you can easily write an ipchains modul which accomplishes the same, all you have to do is to set 'from_imq" to 1 in the skb. A good start might be the MARK target, modifying (the iptables one) for imq took only a couple of minutes. > By the way: Imagine the IMQ-device is allready up and a new ISDN-device is > comming up, will the packages of the new ISDN-device automatically be send to > IMQ or do I have to take the IMQ-device down and up again? >From net/core/core.c: int dev_queue_xmit(struct sk_buff *skb) ... #ifdef CONFIG_IMQ /* special intermediate queue up ? */ if (imq_dev.flags&IFF_UP && !skb->from_imq) { spin_lock_bh(&imq_dev.queue_lock); q = imq_dev.qdisc; if (q->enqueue) { int ret = q->enqueue(skb, q); qdisc_run(&imq_dev); spin_unlock_bh(&imq_dev.queue_lock); return ret = NET_XMIT_BYPASS ? NET_XMIT_SUCCESS : ret; } spin_unlock_bh(&imq_dev.queue_lock); } #endif ... So i would say everything will be going to the IMQ device automatically. Bye, Patrick _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/